1 /*
2 * Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24 #include "precompiled.hpp"
25 #include "classfile/classFileParser.hpp"
26 #include "classfile/classFileStream.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.inline.hpp"
29 #include "classfile/classLoadInfo.hpp"
30 #include "classfile/defaultMethods.hpp"
31 #include "classfile/fieldLayoutBuilder.hpp"
32 #include "classfile/javaClasses.inline.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/packageEntry.hpp"
35 #include "classfile/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/verificationType.hpp"
38 #include "classfile/verifier.hpp"
39 #include "classfile/vmClasses.hpp"
40 #include "classfile/vmSymbols.hpp"
41 #include "jvm.h"
42 #include "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "memory/allocation.hpp"
45 #include "memory/metadataFactory.hpp"
46 #include "memory/oopFactory.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "oops/annotations.hpp"
50 #include "oops/constantPool.inline.hpp"
51 #include "oops/fieldInfo.hpp"
52 #include "oops/fieldStreams.inline.hpp"
53 #include "oops/instanceKlass.inline.hpp"
54 #include "oops/instanceMirrorKlass.hpp"
55 #include "oops/klass.inline.hpp"
56 #include "oops/klassVtable.hpp"
57 #include "oops/metadata.hpp"
58 #include "oops/method.inline.hpp"
59 #include "oops/oop.inline.hpp"
60 #include "oops/recordComponent.hpp"
61 #include "oops/symbol.hpp"
62 #include "prims/jvmtiExport.hpp"
63 #include "prims/jvmtiThreadState.hpp"
64 #include "runtime/arguments.hpp"
65 #include "runtime/fieldDescriptor.inline.hpp"
66 #include "runtime/handles.inline.hpp"
67 #include "runtime/javaCalls.hpp"
68 #include "runtime/os.hpp"
69 #include "runtime/perfData.hpp"
70 #include "runtime/reflection.hpp"
71 #include "runtime/safepointVerifiers.hpp"
72 #include "runtime/signature.hpp"
73 #include "runtime/timer.hpp"
74 #include "services/classLoadingService.hpp"
75 #include "services/threadService.hpp"
76 #include "utilities/align.hpp"
77 #include "utilities/bitMap.inline.hpp"
78 #include "utilities/checkedCast.hpp"
79 #include "utilities/copy.hpp"
80 #include "utilities/formatBuffer.hpp"
81 #include "utilities/exceptions.hpp"
82 #include "utilities/globalDefinitions.hpp"
83 #include "utilities/growableArray.hpp"
84 #include "utilities/macros.hpp"
85 #include "utilities/ostream.hpp"
86 #include "utilities/resourceHash.hpp"
87 #include "utilities/utf8.hpp"
88 #if INCLUDE_CDS
89 #include "classfile/systemDictionaryShared.hpp"
90 #endif
91 #if INCLUDE_JFR
92 #include "jfr/support/jfrTraceIdExtension.hpp"
93 #endif
94
95 // We generally try to create the oops directly when parsing, rather than
96 // allocating temporary data structures and copying the bytes twice. A
97 // temporary area is only needed when parsing utf8 entries in the constant
98 // pool and when parsing line number tables.
99
100 // We add assert in debug mode when class format is not checked.
101
102 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
103 #define JAVA_MIN_SUPPORTED_VERSION 45
104 #define JAVA_PREVIEW_MINOR_VERSION 65535
105
106 // Used for two backward compatibility reasons:
107 // - to check for new additions to the class file format in JDK1.5
108 // - to check for bug fixes in the format checker in JDK1.5
109 #define JAVA_1_5_VERSION 49
110
111 // Used for backward compatibility reasons:
112 // - to check for javac bug fixes that happened after 1.5
113 // - also used as the max version when running in jdk6
114 #define JAVA_6_VERSION 50
115
116 // Used for backward compatibility reasons:
117 // - to disallow argument and require ACC_STATIC for <clinit> methods
118 #define JAVA_7_VERSION 51
119
120 // Extension method support.
121 #define JAVA_8_VERSION 52
122
123 #define JAVA_9_VERSION 53
124
125 #define JAVA_10_VERSION 54
126
127 #define JAVA_11_VERSION 55
128
129 #define JAVA_12_VERSION 56
130
131 #define JAVA_13_VERSION 57
132
133 #define JAVA_14_VERSION 58
134
135 #define JAVA_15_VERSION 59
136
137 #define JAVA_16_VERSION 60
138
139 #define JAVA_17_VERSION 61
140
141 #define JAVA_18_VERSION 62
142
143 #define JAVA_19_VERSION 63
144
145 #define JAVA_20_VERSION 64
146
147 #define JAVA_21_VERSION 65
148
149 #define JAVA_22_VERSION 66
150
151 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
152 assert((bad_constant == JVM_CONSTANT_Module ||
153 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
154 "Unexpected bad constant pool entry");
155 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
156 }
157
158 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
159 ConstantPool* cp,
160 const int length,
161 TRAPS) {
162 assert(stream != nullptr, "invariant");
163 assert(cp != nullptr, "invariant");
164
165 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
166 // this function (_current can be allocated in a register, with scalar
167 // replacement of aggregates). The _current pointer is copied back to
168 // stream() when this function returns. DON'T call another method within
169 // this method that uses stream().
170 const ClassFileStream cfs1 = *stream;
171 const ClassFileStream* const cfs = &cfs1;
172
173 debug_only(const u1* const old_current = stream->current();)
174
175 // Used for batching symbol allocations.
176 const char* names[SymbolTable::symbol_alloc_batch_size];
177 int lengths[SymbolTable::symbol_alloc_batch_size];
178 int indices[SymbolTable::symbol_alloc_batch_size];
179 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
180 int names_count = 0;
181
182 // parsing Index 0 is unused
183 for (int index = 1; index < length; index++) {
184 // Each of the following case guarantees one more byte in the stream
185 // for the following tag or the access_flags following constant pool,
186 // so we don't need bounds-check for reading tag.
187 const u1 tag = cfs->get_u1_fast();
188 switch (tag) {
189 case JVM_CONSTANT_Class : {
190 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
191 const u2 name_index = cfs->get_u2_fast();
192 cp->klass_index_at_put(index, name_index);
193 break;
194 }
195 case JVM_CONSTANT_Fieldref: {
196 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
197 const u2 class_index = cfs->get_u2_fast();
198 const u2 name_and_type_index = cfs->get_u2_fast();
199 cp->field_at_put(index, class_index, name_and_type_index);
200 break;
201 }
202 case JVM_CONSTANT_Methodref: {
203 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
204 const u2 class_index = cfs->get_u2_fast();
205 const u2 name_and_type_index = cfs->get_u2_fast();
206 cp->method_at_put(index, class_index, name_and_type_index);
207 break;
208 }
209 case JVM_CONSTANT_InterfaceMethodref: {
210 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
211 const u2 class_index = cfs->get_u2_fast();
212 const u2 name_and_type_index = cfs->get_u2_fast();
213 cp->interface_method_at_put(index, class_index, name_and_type_index);
214 break;
215 }
216 case JVM_CONSTANT_String : {
217 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
218 const u2 string_index = cfs->get_u2_fast();
219 cp->string_index_at_put(index, string_index);
220 break;
221 }
222 case JVM_CONSTANT_MethodHandle :
223 case JVM_CONSTANT_MethodType: {
224 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
225 classfile_parse_error(
226 "Class file version does not support constant tag %u in class file %s",
227 tag, THREAD);
228 return;
229 }
230 if (tag == JVM_CONSTANT_MethodHandle) {
231 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
232 const u1 ref_kind = cfs->get_u1_fast();
233 const u2 method_index = cfs->get_u2_fast();
234 cp->method_handle_index_at_put(index, ref_kind, method_index);
235 }
236 else if (tag == JVM_CONSTANT_MethodType) {
237 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
238 const u2 signature_index = cfs->get_u2_fast();
239 cp->method_type_index_at_put(index, signature_index);
240 }
241 else {
242 ShouldNotReachHere();
243 }
244 break;
245 }
246 case JVM_CONSTANT_Dynamic : {
247 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
248 classfile_parse_error(
249 "Class file version does not support constant tag %u in class file %s",
250 tag, THREAD);
251 return;
252 }
253 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
254 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
255 const u2 name_and_type_index = cfs->get_u2_fast();
256 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
257 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
258 }
259 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
260 break;
261 }
262 case JVM_CONSTANT_InvokeDynamic : {
263 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
264 classfile_parse_error(
265 "Class file version does not support constant tag %u in class file %s",
266 tag, THREAD);
267 return;
268 }
269 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
270 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
271 const u2 name_and_type_index = cfs->get_u2_fast();
272 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
273 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
274 }
275 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
276 break;
277 }
278 case JVM_CONSTANT_Integer: {
279 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
280 const u4 bytes = cfs->get_u4_fast();
281 cp->int_at_put(index, (jint)bytes);
282 break;
283 }
284 case JVM_CONSTANT_Float: {
285 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
286 const u4 bytes = cfs->get_u4_fast();
287 cp->float_at_put(index, *(jfloat*)&bytes);
288 break;
289 }
290 case JVM_CONSTANT_Long: {
291 // A mangled type might cause you to overrun allocated memory
292 guarantee_property(index + 1 < length,
293 "Invalid constant pool entry %u in class file %s",
294 index,
295 CHECK);
296 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
297 const u8 bytes = cfs->get_u8_fast();
298 cp->long_at_put(index, bytes);
299 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
300 break;
301 }
302 case JVM_CONSTANT_Double: {
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->double_at_put(index, *(jdouble*)&bytes);
311 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
312 break;
313 }
314 case JVM_CONSTANT_NameAndType: {
315 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
316 const u2 name_index = cfs->get_u2_fast();
317 const u2 signature_index = cfs->get_u2_fast();
318 cp->name_and_type_at_put(index, name_index, signature_index);
319 break;
320 }
321 case JVM_CONSTANT_Utf8 : {
322 cfs->guarantee_more(2, CHECK); // utf8_length
323 u2 utf8_length = cfs->get_u2_fast();
324 const u1* utf8_buffer = cfs->current();
325 assert(utf8_buffer != nullptr, "null utf8 buffer");
326 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
327 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
328 cfs->skip_u1_fast(utf8_length);
329
330 // Before storing the symbol, make sure it's legal
331 if (_need_verify) {
332 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
333 }
334
335 unsigned int hash;
336 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
337 utf8_length,
338 hash);
339 if (result == nullptr) {
340 names[names_count] = (const char*)utf8_buffer;
341 lengths[names_count] = utf8_length;
342 indices[names_count] = index;
343 hashValues[names_count++] = hash;
344 if (names_count == SymbolTable::symbol_alloc_batch_size) {
345 SymbolTable::new_symbols(_loader_data,
346 constantPoolHandle(THREAD, cp),
347 names_count,
348 names,
349 lengths,
350 indices,
351 hashValues);
352 names_count = 0;
353 }
354 } else {
355 cp->symbol_at_put(index, result);
356 }
357 break;
358 }
359 case JVM_CONSTANT_Module:
360 case JVM_CONSTANT_Package: {
361 // Record that an error occurred in these two cases but keep parsing so
362 // that ACC_Module can be checked for in the access_flags. Need to
363 // throw NoClassDefFoundError in that case.
364 if (_major_version >= JAVA_9_VERSION) {
365 cfs->guarantee_more(3, CHECK);
366 cfs->get_u2_fast();
367 set_class_bad_constant_seen(tag);
368 break;
369 }
370 }
371 default: {
372 classfile_parse_error("Unknown constant tag %u in class file %s",
373 tag,
374 THREAD);
375 return;
376 }
377 } // end of switch(tag)
378 } // end of for
379
380 // Allocate the remaining symbols
381 if (names_count > 0) {
382 SymbolTable::new_symbols(_loader_data,
383 constantPoolHandle(THREAD, cp),
384 names_count,
385 names,
386 lengths,
387 indices,
388 hashValues);
389 }
390
391 // Copy _current pointer of local copy back to stream.
392 assert(stream->current() == old_current, "non-exclusive use of stream");
393 stream->set_current(cfs1.current());
394
395 }
396
397 static inline bool valid_cp_range(int index, int length) {
398 return (index > 0 && index < length);
399 }
400
401 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
402 assert(cp != nullptr, "invariant");
403 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
404 return cp->symbol_at(index);
405 }
406 return nullptr;
407 }
408
409 #ifdef ASSERT
410 PRAGMA_DIAG_PUSH
411 PRAGMA_FORMAT_NONLITERAL_IGNORED
412 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
413 ResourceMark rm(THREAD);
414 fatal(msg, _class_name->as_C_string());
415 }
416
417 void ClassFileParser::report_assert_property_failure(const char* msg,
418 int index,
419 TRAPS) const {
420 ResourceMark rm(THREAD);
421 fatal(msg, index, _class_name->as_C_string());
422 }
423 PRAGMA_DIAG_POP
424 #endif
425
426 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
427 ConstantPool* const cp,
428 const int length,
429 TRAPS) {
430 assert(cp != nullptr, "invariant");
431 assert(stream != nullptr, "invariant");
432
433 // parsing constant pool entries
434 parse_constant_pool_entries(stream, cp, length, CHECK);
435 if (class_bad_constant_seen() != 0) {
436 // a bad CP entry has been detected previously so stop parsing and just return.
437 return;
438 }
439
440 int index = 1; // declared outside of loops for portability
441 int num_klasses = 0;
442
443 // first verification pass - validate cross references
444 // and fixup class and string constants
445 for (index = 1; index < length; index++) { // Index 0 is unused
446 const jbyte tag = cp->tag_at(index).value();
447 switch (tag) {
448 case JVM_CONSTANT_Class: {
449 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
450 break;
451 }
452 case JVM_CONSTANT_Fieldref:
453 // fall through
454 case JVM_CONSTANT_Methodref:
455 // fall through
456 case JVM_CONSTANT_InterfaceMethodref: {
457 if (!_need_verify) break;
458 const int klass_ref_index = cp->uncached_klass_ref_index_at(index);
459 const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index);
460 check_property(valid_klass_reference_at(klass_ref_index),
461 "Invalid constant pool index %u in class file %s",
462 klass_ref_index, CHECK);
463 check_property(valid_cp_range(name_and_type_ref_index, length) &&
464 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
465 "Invalid constant pool index %u in class file %s",
466 name_and_type_ref_index, CHECK);
467 break;
468 }
469 case JVM_CONSTANT_String: {
470 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
471 break;
472 }
473 case JVM_CONSTANT_Integer:
474 break;
475 case JVM_CONSTANT_Float:
476 break;
477 case JVM_CONSTANT_Long:
478 case JVM_CONSTANT_Double: {
479 index++;
480 check_property(
481 (index < length && cp->tag_at(index).is_invalid()),
482 "Improper constant pool long/double index %u in class file %s",
483 index, CHECK);
484 break;
485 }
486 case JVM_CONSTANT_NameAndType: {
487 if (!_need_verify) break;
488 const int name_ref_index = cp->name_ref_index_at(index);
489 const int signature_ref_index = cp->signature_ref_index_at(index);
490 check_property(valid_symbol_at(name_ref_index),
491 "Invalid constant pool index %u in class file %s",
492 name_ref_index, CHECK);
493 check_property(valid_symbol_at(signature_ref_index),
494 "Invalid constant pool index %u in class file %s",
495 signature_ref_index, CHECK);
496 break;
497 }
498 case JVM_CONSTANT_Utf8:
499 break;
500 case JVM_CONSTANT_UnresolvedClass: // fall-through
501 case JVM_CONSTANT_UnresolvedClassInError: {
502 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
503 break;
504 }
505 case JVM_CONSTANT_ClassIndex: {
506 const int class_index = cp->klass_index_at(index);
507 check_property(valid_symbol_at(class_index),
508 "Invalid constant pool index %u in class file %s",
509 class_index, CHECK);
510 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
511 break;
512 }
513 case JVM_CONSTANT_StringIndex: {
514 const int string_index = cp->string_index_at(index);
515 check_property(valid_symbol_at(string_index),
516 "Invalid constant pool index %u in class file %s",
517 string_index, CHECK);
518 Symbol* const sym = cp->symbol_at(string_index);
519 cp->unresolved_string_at_put(index, sym);
520 break;
521 }
522 case JVM_CONSTANT_MethodHandle: {
523 const int ref_index = cp->method_handle_index_at(index);
524 check_property(valid_cp_range(ref_index, length),
525 "Invalid constant pool index %u in class file %s",
526 ref_index, CHECK);
527 const constantTag tag = cp->tag_at(ref_index);
528 const int ref_kind = cp->method_handle_ref_kind_at(index);
529
530 switch (ref_kind) {
531 case JVM_REF_getField:
532 case JVM_REF_getStatic:
533 case JVM_REF_putField:
534 case JVM_REF_putStatic: {
535 check_property(
536 tag.is_field(),
537 "Invalid constant pool index %u in class file %s (not a field)",
538 ref_index, CHECK);
539 break;
540 }
541 case JVM_REF_invokeVirtual:
542 case JVM_REF_newInvokeSpecial: {
543 check_property(
544 tag.is_method(),
545 "Invalid constant pool index %u in class file %s (not a method)",
546 ref_index, CHECK);
547 break;
548 }
549 case JVM_REF_invokeStatic:
550 case JVM_REF_invokeSpecial: {
551 check_property(
552 tag.is_method() ||
553 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
554 "Invalid constant pool index %u in class file %s (not a method)",
555 ref_index, CHECK);
556 break;
557 }
558 case JVM_REF_invokeInterface: {
559 check_property(
560 tag.is_interface_method(),
561 "Invalid constant pool index %u in class file %s (not an interface method)",
562 ref_index, CHECK);
563 break;
564 }
565 default: {
566 classfile_parse_error(
567 "Bad method handle kind at constant pool index %u in class file %s",
568 index, THREAD);
569 return;
570 }
571 } // switch(refkind)
572 // Keep the ref_index unchanged. It will be indirected at link-time.
573 break;
574 } // case MethodHandle
575 case JVM_CONSTANT_MethodType: {
576 const int ref_index = cp->method_type_index_at(index);
577 check_property(valid_symbol_at(ref_index),
578 "Invalid constant pool index %u in class file %s",
579 ref_index, CHECK);
580 break;
581 }
582 case JVM_CONSTANT_Dynamic: {
583 const int name_and_type_ref_index =
584 cp->bootstrap_name_and_type_ref_index_at(index);
585
586 check_property(valid_cp_range(name_and_type_ref_index, length) &&
587 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
588 "Invalid constant pool index %u in class file %s",
589 name_and_type_ref_index, CHECK);
590 // bootstrap specifier index must be checked later,
591 // when BootstrapMethods attr is available
592
593 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
594 cp->set_has_dynamic_constant();
595 break;
596 }
597 case JVM_CONSTANT_InvokeDynamic: {
598 const int name_and_type_ref_index =
599 cp->bootstrap_name_and_type_ref_index_at(index);
600
601 check_property(valid_cp_range(name_and_type_ref_index, length) &&
602 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
603 "Invalid constant pool index %u in class file %s",
604 name_and_type_ref_index, CHECK);
605 // bootstrap specifier index must be checked later,
606 // when BootstrapMethods attr is available
607 break;
608 }
609 default: {
610 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
611 ShouldNotReachHere();
612 break;
613 }
614 } // switch(tag)
615 } // end of for
616
617 cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
618
619 if (!_need_verify) {
620 return;
621 }
622
623 // second verification pass - checks the strings are of the right format.
624 // but not yet to the other entries
625 for (index = 1; index < length; index++) {
626 const jbyte tag = cp->tag_at(index).value();
627 switch (tag) {
628 case JVM_CONSTANT_UnresolvedClass: {
629 const Symbol* const class_name = cp->klass_name_at(index);
630 // check the name
631 verify_legal_class_name(class_name, CHECK);
632 break;
633 }
634 case JVM_CONSTANT_NameAndType: {
635 if (_need_verify) {
636 const int sig_index = cp->signature_ref_index_at(index);
637 const int name_index = cp->name_ref_index_at(index);
638 const Symbol* const name = cp->symbol_at(name_index);
639 const Symbol* const sig = cp->symbol_at(sig_index);
640 guarantee_property(sig->utf8_length() != 0,
641 "Illegal zero length constant pool entry at %d in class %s",
642 sig_index, CHECK);
643 guarantee_property(name->utf8_length() != 0,
644 "Illegal zero length constant pool entry at %d in class %s",
645 name_index, CHECK);
646
647 if (Signature::is_method(sig)) {
648 // Format check method name and signature
649 verify_legal_method_name(name, CHECK);
650 verify_legal_method_signature(name, sig, CHECK);
651 } else {
652 // Format check field name and signature
653 verify_legal_field_name(name, CHECK);
654 verify_legal_field_signature(name, sig, CHECK);
655 }
656 }
657 break;
658 }
659 case JVM_CONSTANT_Dynamic: {
660 const int name_and_type_ref_index =
661 cp->uncached_name_and_type_ref_index_at(index);
662 // already verified to be utf8
663 const int name_ref_index =
664 cp->name_ref_index_at(name_and_type_ref_index);
665 // already verified to be utf8
666 const int signature_ref_index =
667 cp->signature_ref_index_at(name_and_type_ref_index);
668 const Symbol* const name = cp->symbol_at(name_ref_index);
669 const Symbol* const signature = cp->symbol_at(signature_ref_index);
670 if (_need_verify) {
671 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
672 // Need only to be sure signature is the right type.
673 if (Signature::is_method(signature)) {
674 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
675 }
676 }
677 break;
678 }
679 case JVM_CONSTANT_InvokeDynamic:
680 case JVM_CONSTANT_Fieldref:
681 case JVM_CONSTANT_Methodref:
682 case JVM_CONSTANT_InterfaceMethodref: {
683 const int name_and_type_ref_index =
684 cp->uncached_name_and_type_ref_index_at(index);
685 // already verified to be utf8
686 const int name_ref_index =
687 cp->name_ref_index_at(name_and_type_ref_index);
688 // already verified to be utf8
689 const int signature_ref_index =
690 cp->signature_ref_index_at(name_and_type_ref_index);
691 const Symbol* const name = cp->symbol_at(name_ref_index);
692 const Symbol* const signature = cp->symbol_at(signature_ref_index);
693 if (tag == JVM_CONSTANT_Fieldref) {
694 if (_need_verify) {
695 // Field name and signature are verified above, when iterating NameAndType_info.
696 // Need only to be sure signature is non-zero length and the right type.
697 if (Signature::is_method(signature)) {
698 throwIllegalSignature("Field", name, signature, CHECK);
699 }
700 }
701 } else {
702 if (_need_verify) {
703 // Method name and signature are individually verified above, when iterating
704 // NameAndType_info. Need to check here that signature is non-zero length and
705 // the right type.
706 if (!Signature::is_method(signature)) {
707 throwIllegalSignature("Method", name, signature, CHECK);
708 }
709 }
710 // If a class method name begins with '<', it must be "<init>" and have void signature.
711 const unsigned int name_len = name->utf8_length();
712 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
713 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
714 if (name != vmSymbols::object_initializer_name()) {
715 classfile_parse_error(
716 "Bad method name at constant pool index %u in class file %s",
717 name_ref_index, THREAD);
718 return;
719 } else if (!Signature::is_void_method(signature)) { // must have void signature.
720 throwIllegalSignature("Method", name, signature, CHECK);
721 }
722 }
723 }
724 break;
725 }
726 case JVM_CONSTANT_MethodHandle: {
727 const int ref_index = cp->method_handle_index_at(index);
728 const int ref_kind = cp->method_handle_ref_kind_at(index);
729 switch (ref_kind) {
730 case JVM_REF_invokeVirtual:
731 case JVM_REF_invokeStatic:
732 case JVM_REF_invokeSpecial:
733 case JVM_REF_newInvokeSpecial: {
734 const int name_and_type_ref_index =
735 cp->uncached_name_and_type_ref_index_at(ref_index);
736 const int name_ref_index =
737 cp->name_ref_index_at(name_and_type_ref_index);
738 const Symbol* const name = cp->symbol_at(name_ref_index);
739 if (ref_kind == JVM_REF_newInvokeSpecial) {
740 if (name != vmSymbols::object_initializer_name()) {
741 classfile_parse_error(
742 "Bad constructor name at constant pool index %u in class file %s",
743 name_ref_index, THREAD);
744 return;
745 }
746 } else {
747 if (name == vmSymbols::object_initializer_name()) {
748 classfile_parse_error(
749 "Bad method name at constant pool index %u in class file %s",
750 name_ref_index, THREAD);
751 return;
752 }
753 }
754 break;
755 }
756 // Other ref_kinds are already fully checked in previous pass.
757 } // switch(ref_kind)
758 break;
759 }
760 case JVM_CONSTANT_MethodType: {
761 const Symbol* const no_name = vmSymbols::type_name(); // place holder
762 const Symbol* const signature = cp->method_type_signature_at(index);
763 verify_legal_method_signature(no_name, signature, CHECK);
764 break;
765 }
766 case JVM_CONSTANT_Utf8: {
767 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
768 }
769 } // switch(tag)
770 } // end of for
771 }
772
773 class NameSigHash: public ResourceObj {
774 public:
775 const Symbol* _name; // name
776 const Symbol* _sig; // signature
777
778 static const int HASH_ROW_SIZE = 256;
779
780 NameSigHash(Symbol* name, Symbol* sig) :
781 _name(name),
782 _sig(sig) {}
783
784 static unsigned int hash(NameSigHash const& namesig) {
785 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
786 }
787
788 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
789 return (e0._name == e1._name) &&
790 (e0._sig == e1._sig);
791 }
792 };
793
794 using NameSigHashtable = ResourceHashtable<NameSigHash, int,
795 NameSigHash::HASH_ROW_SIZE,
796 AnyObj::RESOURCE_AREA, mtInternal,
797 &NameSigHash::hash, &NameSigHash::equals>;
798
799 // Side-effects: populates the _local_interfaces field
800 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
801 const int itfs_len,
802 ConstantPool* const cp,
803 bool* const has_nonstatic_concrete_methods,
804 TRAPS) {
805 assert(stream != nullptr, "invariant");
806 assert(cp != nullptr, "invariant");
807 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
808
809 if (itfs_len == 0) {
810 _local_interfaces = Universe::the_empty_instance_klass_array();
811 } else {
812 assert(itfs_len > 0, "only called for len>0");
813 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
814
815 int index;
816 for (index = 0; index < itfs_len; index++) {
817 const u2 interface_index = stream->get_u2(CHECK);
818 Klass* interf;
819 check_property(
820 valid_klass_reference_at(interface_index),
821 "Interface name has bad constant pool index %u in class file %s",
822 interface_index, CHECK);
823 if (cp->tag_at(interface_index).is_klass()) {
824 interf = cp->resolved_klass_at(interface_index);
825 } else {
826 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
827
828 // Don't need to check legal name because it's checked when parsing constant pool.
829 // But need to make sure it's not an array type.
830 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
831 "Bad interface name in class file %s", CHECK);
832
833 // Call resolve_super so class circularity is checked
834 interf = SystemDictionary::resolve_super_or_fail(
835 _class_name,
836 unresolved_klass,
837 Handle(THREAD, _loader_data->class_loader()),
838 _protection_domain,
839 false,
840 CHECK);
841 }
842
843 if (!interf->is_interface()) {
844 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
845 err_msg("class %s can not implement %s, because it is not an interface (%s)",
846 _class_name->as_klass_external_name(),
847 interf->external_name(),
848 interf->class_in_module_of_loader()));
849 }
850
851 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
852 *has_nonstatic_concrete_methods = true;
853 }
854 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
855 }
856
857 if (!_need_verify || itfs_len <= 1) {
858 return;
859 }
860
861 // Check if there's any duplicates in interfaces
862 ResourceMark rm(THREAD);
863 // Set containing interface names
864 ResourceHashtable<Symbol*, int>* interface_names = new ResourceHashtable<Symbol*, int>();
865 for (index = 0; index < itfs_len; index++) {
866 const InstanceKlass* const k = _local_interfaces->at(index);
867 Symbol* interface_name = k->name();
868 // If no duplicates, add (name, nullptr) in hashtable interface_names.
869 if (!interface_names->put(interface_name, 0)) {
870 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
871 interface_name->as_C_string(), THREAD);
872 return;
873 }
874 }
875 }
876 }
877
878 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
879 int constantvalue_index,
880 int signature_index,
881 TRAPS) const {
882 // Make sure the constant pool entry is of a type appropriate to this field
883 guarantee_property(
884 (constantvalue_index > 0 &&
885 constantvalue_index < cp->length()),
886 "Bad initial value index %u in ConstantValue attribute in class file %s",
887 constantvalue_index, CHECK);
888
889 const constantTag value_type = cp->tag_at(constantvalue_index);
890 switch(cp->basic_type_for_signature_at(signature_index)) {
891 case T_LONG: {
892 guarantee_property(value_type.is_long(),
893 "Inconsistent constant value type in class file %s",
894 CHECK);
895 break;
896 }
897 case T_FLOAT: {
898 guarantee_property(value_type.is_float(),
899 "Inconsistent constant value type in class file %s",
900 CHECK);
901 break;
902 }
903 case T_DOUBLE: {
904 guarantee_property(value_type.is_double(),
905 "Inconsistent constant value type in class file %s",
906 CHECK);
907 break;
908 }
909 case T_BYTE:
910 case T_CHAR:
911 case T_SHORT:
912 case T_BOOLEAN:
913 case T_INT: {
914 guarantee_property(value_type.is_int(),
915 "Inconsistent constant value type in class file %s",
916 CHECK);
917 break;
918 }
919 case T_OBJECT: {
920 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
921 && value_type.is_string()),
922 "Bad string initial value in class file %s",
923 CHECK);
924 break;
925 }
926 default: {
927 classfile_parse_error("Unable to set initial value %u in class file %s",
928 constantvalue_index,
929 THREAD);
930 }
931 }
932 }
933
934 class AnnotationCollector : public ResourceObj{
935 public:
936 enum Location { _in_field, _in_method, _in_class };
937 enum ID {
938 _unknown = 0,
939 _method_CallerSensitive,
940 _method_ForceInline,
941 _method_DontInline,
942 _method_ChangesCurrentThread,
943 _method_JvmtiMountTransition,
944 _method_InjectedProfile,
945 _method_LambdaForm_Compiled,
946 _method_Hidden,
947 _method_Scoped,
948 _method_IntrinsicCandidate,
949 _jdk_internal_vm_annotation_Contended,
950 _field_Stable,
951 _jdk_internal_vm_annotation_ReservedStackAccess,
952 _jdk_internal_ValueBased,
953 _annotation_LIMIT
954 };
955 const Location _location;
956 int _annotations_present;
957 u2 _contended_group;
958
959 AnnotationCollector(Location location)
960 : _location(location), _annotations_present(0), _contended_group(0)
961 {
962 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
963 }
964 // If this annotation name has an ID, report it (or _none).
965 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
966 // Set the annotation name:
967 void set_annotation(ID id) {
968 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
969 _annotations_present |= (int)nth_bit((int)id);
970 }
971
972 void remove_annotation(ID id) {
973 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
974 _annotations_present &= (int)~nth_bit((int)id);
975 }
976
977 // Report if the annotation is present.
978 bool has_any_annotations() const { return _annotations_present != 0; }
979 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
980
981 void set_contended_group(u2 group) { _contended_group = group; }
982 u2 contended_group() const { return _contended_group; }
983
984 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
985
986 void set_stable(bool stable) { set_annotation(_field_Stable); }
987 bool is_stable() const { return has_annotation(_field_Stable); }
988 };
989
990 // This class also doubles as a holder for metadata cleanup.
991 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
992 private:
993 ClassLoaderData* _loader_data;
994 AnnotationArray* _field_annotations;
995 AnnotationArray* _field_type_annotations;
996 public:
997 FieldAnnotationCollector(ClassLoaderData* loader_data) :
998 AnnotationCollector(_in_field),
999 _loader_data(loader_data),
1000 _field_annotations(nullptr),
1001 _field_type_annotations(nullptr) {}
1002 ~FieldAnnotationCollector();
1003 void apply_to(FieldInfo* f);
1004 AnnotationArray* field_annotations() { return _field_annotations; }
1005 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1006
1007 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1008 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1009 };
1010
1011 class MethodAnnotationCollector : public AnnotationCollector{
1012 public:
1013 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1014 void apply_to(const methodHandle& m);
1015 };
1016
1017 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1018 public:
1019 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1020 void apply_to(InstanceKlass* ik);
1021 };
1022
1023
1024 static int skip_annotation_value(const u1*, int, int); // fwd decl
1025
1026 // Safely increment index by val if does not pass limit
1027 #define SAFE_ADD(index, limit, val) \
1028 if (index >= limit - val) return limit; \
1029 index += val;
1030
1031 // Skip an annotation. Return >=limit if there is any problem.
1032 static int skip_annotation(const u1* buffer, int limit, int index) {
1033 assert(buffer != nullptr, "invariant");
1034 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1035 // value := switch (tag:u1) { ... }
1036 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1037 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1038 while (--nmem >= 0 && index < limit) {
1039 SAFE_ADD(index, limit, 2); // skip member
1040 index = skip_annotation_value(buffer, limit, index);
1041 }
1042 return index;
1043 }
1044
1045 // Skip an annotation value. Return >=limit if there is any problem.
1046 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1047 assert(buffer != nullptr, "invariant");
1048
1049 // value := switch (tag:u1) {
1050 // case B, C, I, S, Z, D, F, J, c: con:u2;
1051 // case e: e_class:u2 e_name:u2;
1052 // case s: s_con:u2;
1053 // case [: do(nval:u2) {value};
1054 // case @: annotation;
1055 // case s: s_con:u2;
1056 // }
1057 SAFE_ADD(index, limit, 1); // read tag
1058 const u1 tag = buffer[index - 1];
1059 switch (tag) {
1060 case 'B':
1061 case 'C':
1062 case 'I':
1063 case 'S':
1064 case 'Z':
1065 case 'D':
1066 case 'F':
1067 case 'J':
1068 case 'c':
1069 case 's':
1070 SAFE_ADD(index, limit, 2); // skip con or s_con
1071 break;
1072 case 'e':
1073 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1074 break;
1075 case '[':
1076 {
1077 SAFE_ADD(index, limit, 2); // read nval
1078 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1079 while (--nval >= 0 && index < limit) {
1080 index = skip_annotation_value(buffer, limit, index);
1081 }
1082 }
1083 break;
1084 case '@':
1085 index = skip_annotation(buffer, limit, index);
1086 break;
1087 default:
1088 return limit; // bad tag byte
1089 }
1090 return index;
1091 }
1092
1093 // Sift through annotations, looking for those significant to the VM:
1094 static void parse_annotations(const ConstantPool* const cp,
1095 const u1* buffer, int limit,
1096 AnnotationCollector* coll,
1097 ClassLoaderData* loader_data,
1098 const bool can_access_vm_annotations) {
1099
1100 assert(cp != nullptr, "invariant");
1101 assert(buffer != nullptr, "invariant");
1102 assert(coll != nullptr, "invariant");
1103 assert(loader_data != nullptr, "invariant");
1104
1105 // annotations := do(nann:u2) {annotation}
1106 int index = 2; // read nann
1107 if (index >= limit) return;
1108 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1109 enum { // initial annotation layout
1110 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1111 count_off = 2, // u2 such as 1 (one value)
1112 member_off = 4, // utf8 such as 'value'
1113 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1114 e_tag_val = 'e',
1115 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1116 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1117 e_size = 11, // end of 'e' annotation
1118 c_tag_val = 'c', // payload is type
1119 c_con_off = 7, // utf8 payload, such as 'I'
1120 c_size = 9, // end of 'c' annotation
1121 s_tag_val = 's', // payload is String
1122 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1123 s_size = 9,
1124 min_size = 6 // smallest possible size (zero members)
1125 };
1126 // Cannot add min_size to index in case of overflow MAX_INT
1127 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1128 int index0 = index;
1129 index = skip_annotation(buffer, limit, index);
1130 const u1* const abase = buffer + index0;
1131 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1132 const int count = Bytes::get_Java_u2((address)abase + count_off);
1133 const Symbol* const aname = check_symbol_at(cp, atype);
1134 if (aname == nullptr) break; // invalid annotation name
1135 const Symbol* member = nullptr;
1136 if (count >= 1) {
1137 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1138 member = check_symbol_at(cp, member_index);
1139 if (member == nullptr) break; // invalid member name
1140 }
1141
1142 // Here is where parsing particular annotations will take place.
1143 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1144 if (AnnotationCollector::_unknown == id) continue;
1145 coll->set_annotation(id);
1146
1147 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1148 // @Contended can optionally specify the contention group.
1149 //
1150 // Contended group defines the equivalence class over the fields:
1151 // the fields within the same contended group are not treated distinct.
1152 // The only exception is default group, which does not incur the
1153 // equivalence. Naturally, contention group for classes is meaningless.
1154 //
1155 // While the contention group is specified as String, annotation
1156 // values are already interned, and we might as well use the constant
1157 // pool index as the group tag.
1158 //
1159 u2 group_index = 0; // default contended group
1160 if (count == 1
1161 && s_size == (index - index0) // match size
1162 && s_tag_val == *(abase + tag_off)
1163 && member == vmSymbols::value_name()) {
1164 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1165 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1166 group_index = 0; // default contended group
1167 }
1168 }
1169 coll->set_contended_group(group_index);
1170 }
1171 }
1172 }
1173
1174
1175 // Parse attributes for a field.
1176 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1177 u2 attributes_count,
1178 bool is_static, u2 signature_index,
1179 u2* const constantvalue_index_addr,
1180 bool* const is_synthetic_addr,
1181 u2* const generic_signature_index_addr,
1182 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1183 TRAPS) {
1184 assert(cfs != nullptr, "invariant");
1185 assert(constantvalue_index_addr != nullptr, "invariant");
1186 assert(is_synthetic_addr != nullptr, "invariant");
1187 assert(generic_signature_index_addr != nullptr, "invariant");
1188 assert(parsed_annotations != nullptr, "invariant");
1189 assert(attributes_count > 0, "attributes_count should be greater than 0");
1190
1191 u2 constantvalue_index = 0;
1192 u2 generic_signature_index = 0;
1193 bool is_synthetic = false;
1194 const u1* runtime_visible_annotations = nullptr;
1195 int runtime_visible_annotations_length = 0;
1196 const u1* runtime_invisible_annotations = nullptr;
1197 int runtime_invisible_annotations_length = 0;
1198 const u1* runtime_visible_type_annotations = nullptr;
1199 int runtime_visible_type_annotations_length = 0;
1200 const u1* runtime_invisible_type_annotations = nullptr;
1201 int runtime_invisible_type_annotations_length = 0;
1202 bool runtime_invisible_annotations_exists = false;
1203 bool runtime_invisible_type_annotations_exists = false;
1204 const ConstantPool* const cp = _cp;
1205
1206 while (attributes_count--) {
1207 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1208 const u2 attribute_name_index = cfs->get_u2_fast();
1209 const u4 attribute_length = cfs->get_u4_fast();
1210 check_property(valid_symbol_at(attribute_name_index),
1211 "Invalid field attribute index %u in class file %s",
1212 attribute_name_index,
1213 CHECK);
1214
1215 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1216 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1217 // ignore if non-static
1218 if (constantvalue_index != 0) {
1219 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
1220 return;
1221 }
1222 check_property(
1223 attribute_length == 2,
1224 "Invalid ConstantValue field attribute length %u in class file %s",
1225 attribute_length, CHECK);
1226
1227 constantvalue_index = cfs->get_u2(CHECK);
1228 if (_need_verify) {
1229 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1230 }
1231 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1232 if (attribute_length != 0) {
1233 classfile_parse_error(
1234 "Invalid Synthetic field attribute length %u in class file %s",
1235 attribute_length, THREAD);
1236 return;
1237 }
1238 is_synthetic = true;
1239 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1240 if (attribute_length != 0) {
1241 classfile_parse_error(
1242 "Invalid Deprecated field attribute length %u in class file %s",
1243 attribute_length, THREAD);
1244 return;
1245 }
1246 } else if (_major_version >= JAVA_1_5_VERSION) {
1247 if (attribute_name == vmSymbols::tag_signature()) {
1248 if (generic_signature_index != 0) {
1249 classfile_parse_error(
1250 "Multiple Signature attributes for field in class file %s", THREAD);
1251 return;
1252 }
1253 if (attribute_length != 2) {
1254 classfile_parse_error(
1255 "Wrong size %u for field's Signature attribute in class file %s",
1256 attribute_length, THREAD);
1257 return;
1258 }
1259 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1260 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1261 if (runtime_visible_annotations != nullptr) {
1262 classfile_parse_error(
1263 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
1264 return;
1265 }
1266 runtime_visible_annotations_length = attribute_length;
1267 runtime_visible_annotations = cfs->current();
1268 assert(runtime_visible_annotations != nullptr, "null visible annotations");
1269 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1270 parse_annotations(cp,
1271 runtime_visible_annotations,
1272 runtime_visible_annotations_length,
1273 parsed_annotations,
1274 _loader_data,
1275 _can_access_vm_annotations);
1276 cfs->skip_u1_fast(runtime_visible_annotations_length);
1277 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1278 if (runtime_invisible_annotations_exists) {
1279 classfile_parse_error(
1280 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
1281 return;
1282 }
1283 runtime_invisible_annotations_exists = true;
1284 if (PreserveAllAnnotations) {
1285 runtime_invisible_annotations_length = attribute_length;
1286 runtime_invisible_annotations = cfs->current();
1287 assert(runtime_invisible_annotations != nullptr, "null invisible annotations");
1288 }
1289 cfs->skip_u1(attribute_length, CHECK);
1290 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1291 if (runtime_visible_type_annotations != nullptr) {
1292 classfile_parse_error(
1293 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
1294 return;
1295 }
1296 runtime_visible_type_annotations_length = attribute_length;
1297 runtime_visible_type_annotations = cfs->current();
1298 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
1299 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1300 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1301 if (runtime_invisible_type_annotations_exists) {
1302 classfile_parse_error(
1303 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
1304 return;
1305 } else {
1306 runtime_invisible_type_annotations_exists = true;
1307 }
1308 if (PreserveAllAnnotations) {
1309 runtime_invisible_type_annotations_length = attribute_length;
1310 runtime_invisible_type_annotations = cfs->current();
1311 assert(runtime_invisible_type_annotations != nullptr, "null invisible type annotations");
1312 }
1313 cfs->skip_u1(attribute_length, CHECK);
1314 } else {
1315 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1316 }
1317 } else {
1318 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1319 }
1320 }
1321
1322 *constantvalue_index_addr = constantvalue_index;
1323 *is_synthetic_addr = is_synthetic;
1324 *generic_signature_index_addr = generic_signature_index;
1325 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1326 runtime_visible_annotations_length,
1327 runtime_invisible_annotations,
1328 runtime_invisible_annotations_length,
1329 CHECK);
1330 parsed_annotations->set_field_annotations(a);
1331 a = assemble_annotations(runtime_visible_type_annotations,
1332 runtime_visible_type_annotations_length,
1333 runtime_invisible_type_annotations,
1334 runtime_invisible_type_annotations_length,
1335 CHECK);
1336 parsed_annotations->set_field_type_annotations(a);
1337 return;
1338 }
1339
1340
1341 // Field allocation types. Used for computing field offsets.
1342
1343 enum FieldAllocationType {
1344 STATIC_OOP, // Oops
1345 STATIC_BYTE, // Boolean, Byte, char
1346 STATIC_SHORT, // shorts
1347 STATIC_WORD, // ints
1348 STATIC_DOUBLE, // aligned long or double
1349 NONSTATIC_OOP,
1350 NONSTATIC_BYTE,
1351 NONSTATIC_SHORT,
1352 NONSTATIC_WORD,
1353 NONSTATIC_DOUBLE,
1354 MAX_FIELD_ALLOCATION_TYPE,
1355 BAD_ALLOCATION_TYPE = -1
1356 };
1357
1358 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1359 BAD_ALLOCATION_TYPE, // 0
1360 BAD_ALLOCATION_TYPE, // 1
1361 BAD_ALLOCATION_TYPE, // 2
1362 BAD_ALLOCATION_TYPE, // 3
1363 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1364 NONSTATIC_SHORT, // T_CHAR = 5,
1365 NONSTATIC_WORD, // T_FLOAT = 6,
1366 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1367 NONSTATIC_BYTE, // T_BYTE = 8,
1368 NONSTATIC_SHORT, // T_SHORT = 9,
1369 NONSTATIC_WORD, // T_INT = 10,
1370 NONSTATIC_DOUBLE, // T_LONG = 11,
1371 NONSTATIC_OOP, // T_OBJECT = 12,
1372 NONSTATIC_OOP, // T_ARRAY = 13,
1373 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1374 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1375 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1376 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1377 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1378 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1379 BAD_ALLOCATION_TYPE, // 0
1380 BAD_ALLOCATION_TYPE, // 1
1381 BAD_ALLOCATION_TYPE, // 2
1382 BAD_ALLOCATION_TYPE, // 3
1383 STATIC_BYTE , // T_BOOLEAN = 4,
1384 STATIC_SHORT, // T_CHAR = 5,
1385 STATIC_WORD, // T_FLOAT = 6,
1386 STATIC_DOUBLE, // T_DOUBLE = 7,
1387 STATIC_BYTE, // T_BYTE = 8,
1388 STATIC_SHORT, // T_SHORT = 9,
1389 STATIC_WORD, // T_INT = 10,
1390 STATIC_DOUBLE, // T_LONG = 11,
1391 STATIC_OOP, // T_OBJECT = 12,
1392 STATIC_OOP, // T_ARRAY = 13,
1393 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1394 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1395 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1396 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1397 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1398 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1399 };
1400
1401 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1402 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1403 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1404 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1405 return result;
1406 }
1407
1408 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1409 public:
1410 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1411
1412 FieldAllocationCount() {
1413 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1414 count[i] = 0;
1415 }
1416 }
1417
1418 void update(bool is_static, BasicType type) {
1419 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1420 if (atype != BAD_ALLOCATION_TYPE) {
1421 // Make sure there is no overflow with injected fields.
1422 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1423 count[atype]++;
1424 }
1425 }
1426 };
1427
1428 // Side-effects: populates the _fields, _fields_annotations,
1429 // _fields_type_annotations fields
1430 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1431 bool is_interface,
1432 FieldAllocationCount* const fac,
1433 ConstantPool* cp,
1434 const int cp_size,
1435 u2* const java_fields_count_ptr,
1436 TRAPS) {
1437
1438 assert(cfs != nullptr, "invariant");
1439 assert(fac != nullptr, "invariant");
1440 assert(cp != nullptr, "invariant");
1441 assert(java_fields_count_ptr != nullptr, "invariant");
1442
1443 assert(nullptr == _fields_annotations, "invariant");
1444 assert(nullptr == _fields_type_annotations, "invariant");
1445
1446 cfs->guarantee_more(2, CHECK); // length
1447 const u2 length = cfs->get_u2_fast();
1448 *java_fields_count_ptr = length;
1449
1450 int num_injected = 0;
1451 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1452 &num_injected);
1453 const int total_fields = length + num_injected;
1454
1455 // Allocate a temporary resource array to collect field data.
1456 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1457 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1458
1459 ResourceMark rm(THREAD);
1460 for (int n = 0; n < length; n++) {
1461 // access_flags, name_index, descriptor_index, attributes_count
1462 cfs->guarantee_more(8, CHECK);
1463
1464 AccessFlags access_flags;
1465 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1466 verify_legal_field_modifiers(flags, is_interface, CHECK);
1467 access_flags.set_flags(flags);
1468 FieldInfo::FieldFlags fieldFlags(0);
1469
1470 const u2 name_index = cfs->get_u2_fast();
1471 check_property(valid_symbol_at(name_index),
1472 "Invalid constant pool index %u for field name in class file %s",
1473 name_index, CHECK);
1474 const Symbol* const name = cp->symbol_at(name_index);
1475 verify_legal_field_name(name, CHECK);
1476
1477 const u2 signature_index = cfs->get_u2_fast();
1478 check_property(valid_symbol_at(signature_index),
1479 "Invalid constant pool index %u for field signature in class file %s",
1480 signature_index, CHECK);
1481 const Symbol* const sig = cp->symbol_at(signature_index);
1482 verify_legal_field_signature(name, sig, CHECK);
1483
1484 u2 constantvalue_index = 0;
1485 bool is_synthetic = false;
1486 u2 generic_signature_index = 0;
1487 const bool is_static = access_flags.is_static();
1488 FieldAnnotationCollector parsed_annotations(_loader_data);
1489
1490 const u2 attributes_count = cfs->get_u2_fast();
1491 if (attributes_count > 0) {
1492 parse_field_attributes(cfs,
1493 attributes_count,
1494 is_static,
1495 signature_index,
1496 &constantvalue_index,
1497 &is_synthetic,
1498 &generic_signature_index,
1499 &parsed_annotations,
1500 CHECK);
1501
1502 if (parsed_annotations.field_annotations() != nullptr) {
1503 if (_fields_annotations == nullptr) {
1504 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1505 _loader_data, length, nullptr,
1506 CHECK);
1507 }
1508 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1509 parsed_annotations.set_field_annotations(nullptr);
1510 }
1511 if (parsed_annotations.field_type_annotations() != nullptr) {
1512 if (_fields_type_annotations == nullptr) {
1513 _fields_type_annotations =
1514 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1515 length,
1516 nullptr,
1517 CHECK);
1518 }
1519 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1520 parsed_annotations.set_field_type_annotations(nullptr);
1521 }
1522
1523 if (is_synthetic) {
1524 access_flags.set_is_synthetic();
1525 }
1526 if (generic_signature_index != 0) {
1527 fieldFlags.update_generic(true);
1528 }
1529 }
1530
1531 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1532
1533 // Update FieldAllocationCount for this kind of field
1534 fac->update(is_static, type);
1535
1536 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1537 fi.set_index(n);
1538 if (fieldFlags.is_generic()) {
1539 fi.set_generic_signature_index(generic_signature_index);
1540 }
1541 parsed_annotations.apply_to(&fi);
1542 if (fi.field_flags().is_contended()) {
1543 _has_contended_fields = true;
1544 }
1545 _temp_field_info->append(fi);
1546 }
1547 assert(_temp_field_info->length() == length, "Must be");
1548
1549 int index = length;
1550 if (num_injected != 0) {
1551 for (int n = 0; n < num_injected; n++) {
1552 // Check for duplicates
1553 if (injected[n].may_be_java) {
1554 const Symbol* const name = injected[n].name();
1555 const Symbol* const signature = injected[n].signature();
1556 bool duplicate = false;
1557 for (int i = 0; i < length; i++) {
1558 const FieldInfo* const f = _temp_field_info->adr_at(i);
1559 if (name == cp->symbol_at(f->name_index()) &&
1560 signature == cp->symbol_at(f->signature_index())) {
1561 // Symbol is desclared in Java so skip this one
1562 duplicate = true;
1563 break;
1564 }
1565 }
1566 if (duplicate) {
1567 // These will be removed from the field array at the end
1568 continue;
1569 }
1570 }
1571
1572 // Injected field
1573 FieldInfo::FieldFlags fflags(0);
1574 fflags.update_injected(true);
1575 AccessFlags aflags;
1576 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1577 fi.set_index(index);
1578 _temp_field_info->append(fi);
1579
1580 // Update FieldAllocationCount for this kind of field
1581 const BasicType type = Signature::basic_type(injected[n].signature());
1582 fac->update(false, type);
1583 index++;
1584 }
1585 }
1586
1587 assert(_temp_field_info->length() == index, "Must be");
1588
1589 if (_need_verify && length > 1) {
1590 // Check duplicated fields
1591 ResourceMark rm(THREAD);
1592 // Set containing name-signature pairs
1593 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1594 for (int i = 0; i < _temp_field_info->length(); i++) {
1595 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1596 _temp_field_info->adr_at(i)->signature(_cp));
1597 // If no duplicates, add name/signature in hashtable names_and_sigs.
1598 if(!names_and_sigs->put(name_and_sig, 0)) {
1599 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1600 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1601 return;
1602 }
1603 }
1604 }
1605 }
1606
1607
1608 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1609 u4 code_length,
1610 u4 exception_table_length,
1611 TRAPS) {
1612 assert(cfs != nullptr, "invariant");
1613
1614 const unsafe_u2* const exception_table_start = cfs->current();
1615 assert(exception_table_start != nullptr, "null exception table");
1616
1617 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1618 // end_pc,
1619 // handler_pc,
1620 // catch_type_index
1621
1622 // Will check legal target after parsing code array in verifier.
1623 if (_need_verify) {
1624 for (unsigned int i = 0; i < exception_table_length; i++) {
1625 const u2 start_pc = cfs->get_u2_fast();
1626 const u2 end_pc = cfs->get_u2_fast();
1627 const u2 handler_pc = cfs->get_u2_fast();
1628 const u2 catch_type_index = cfs->get_u2_fast();
1629 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1630 "Illegal exception table range in class file %s",
1631 CHECK_NULL);
1632 guarantee_property(handler_pc < code_length,
1633 "Illegal exception table handler in class file %s",
1634 CHECK_NULL);
1635 if (catch_type_index != 0) {
1636 guarantee_property(valid_klass_reference_at(catch_type_index),
1637 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1638 }
1639 }
1640 } else {
1641 cfs->skip_u2_fast(exception_table_length * 4);
1642 }
1643 return exception_table_start;
1644 }
1645
1646 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1647 u4 code_length,
1648 CompressedLineNumberWriteStream**const write_stream,
1649 TRAPS) {
1650
1651 const ClassFileStream* const cfs = _stream;
1652 unsigned int num_entries = cfs->get_u2(CHECK);
1653
1654 // Each entry is a u2 start_pc, and a u2 line_number
1655 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1656
1657 // Verify line number attribute and table length
1658 check_property(
1659 code_attribute_length == sizeof(u2) + length_in_bytes,
1660 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1661
1662 cfs->guarantee_more(length_in_bytes, CHECK);
1663
1664 if ((*write_stream) == nullptr) {
1665 if (length_in_bytes > fixed_buffer_size) {
1666 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1667 } else {
1668 (*write_stream) = new CompressedLineNumberWriteStream(
1669 _linenumbertable_buffer, fixed_buffer_size);
1670 }
1671 }
1672
1673 while (num_entries-- > 0) {
1674 const u2 bci = cfs->get_u2_fast(); // start_pc
1675 const u2 line = cfs->get_u2_fast(); // line_number
1676 guarantee_property(bci < code_length,
1677 "Invalid pc in LineNumberTable in class file %s", CHECK);
1678 (*write_stream)->write_pair(bci, line);
1679 }
1680 }
1681
1682
1683 class LVT_Hash : public AllStatic {
1684 public:
1685
1686 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1687 /*
1688 * 3-tuple start_bci/length/slot has to be unique key,
1689 * so the following comparison seems to be redundant:
1690 * && elem->name_cp_index == entry->_elem->name_cp_index
1691 */
1692 return (e0.start_bci == e1.start_bci &&
1693 e0.length == e1.length &&
1694 e0.name_cp_index == e1.name_cp_index &&
1695 e0.slot == e1.slot);
1696 }
1697
1698 static unsigned int hash(LocalVariableTableElement const& e0) {
1699 unsigned int raw_hash = e0.start_bci;
1700
1701 raw_hash = e0.length + raw_hash * 37;
1702 raw_hash = e0.name_cp_index + raw_hash * 37;
1703 raw_hash = e0.slot + raw_hash * 37;
1704
1705 return raw_hash;
1706 }
1707 };
1708
1709
1710 // Class file LocalVariableTable elements.
1711 class Classfile_LVT_Element {
1712 public:
1713 u2 start_bci;
1714 u2 length;
1715 u2 name_cp_index;
1716 u2 descriptor_cp_index;
1717 u2 slot;
1718 };
1719
1720 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1721 LocalVariableTableElement* const lvt) {
1722 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1723 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1724 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1725 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1726 lvt->signature_cp_index = 0;
1727 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1728 }
1729
1730 // Function is used to parse both attributes:
1731 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1732 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1733 u4 code_length,
1734 u2 max_locals,
1735 u4 code_attribute_length,
1736 u2* const localvariable_table_length,
1737 bool isLVTT,
1738 TRAPS) {
1739 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1740 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1741 const unsigned int size = checked_cast<unsigned>(
1742 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2));
1743
1744 const ConstantPool* const cp = _cp;
1745
1746 // Verify local variable table attribute has right length
1747 if (_need_verify) {
1748 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1749 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1750 }
1751
1752 const unsafe_u2* const localvariable_table_start = cfs->current();
1753 assert(localvariable_table_start != nullptr, "null local variable table");
1754 if (!_need_verify) {
1755 cfs->skip_u2_fast(size);
1756 } else {
1757 cfs->guarantee_more(size * 2, CHECK_NULL);
1758 for(int i = 0; i < (*localvariable_table_length); i++) {
1759 const u2 start_pc = cfs->get_u2_fast();
1760 const u2 length = cfs->get_u2_fast();
1761 const u2 name_index = cfs->get_u2_fast();
1762 const u2 descriptor_index = cfs->get_u2_fast();
1763 const u2 index = cfs->get_u2_fast();
1764 // Assign to a u4 to avoid overflow
1765 const u4 end_pc = (u4)start_pc + (u4)length;
1766
1767 if (start_pc >= code_length) {
1768 classfile_parse_error(
1769 "Invalid start_pc %u in %s in class file %s",
1770 start_pc, tbl_name, THREAD);
1771 return nullptr;
1772 }
1773 if (end_pc > code_length) {
1774 classfile_parse_error(
1775 "Invalid length %u in %s in class file %s",
1776 length, tbl_name, THREAD);
1777 return nullptr;
1778 }
1779 const int cp_size = cp->length();
1780 guarantee_property(valid_symbol_at(name_index),
1781 "Name index %u in %s has bad constant type in class file %s",
1782 name_index, tbl_name, CHECK_NULL);
1783 guarantee_property(valid_symbol_at(descriptor_index),
1784 "Signature index %u in %s has bad constant type in class file %s",
1785 descriptor_index, tbl_name, CHECK_NULL);
1786
1787 const Symbol* const name = cp->symbol_at(name_index);
1788 const Symbol* const sig = cp->symbol_at(descriptor_index);
1789 verify_legal_field_name(name, CHECK_NULL);
1790 u2 extra_slot = 0;
1791 if (!isLVTT) {
1792 verify_legal_field_signature(name, sig, CHECK_NULL);
1793
1794 // 4894874: check special cases for double and long local variables
1795 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1796 sig == vmSymbols::type_signature(T_LONG)) {
1797 extra_slot = 1;
1798 }
1799 }
1800 guarantee_property((index + extra_slot) < max_locals,
1801 "Invalid index %u in %s in class file %s",
1802 index, tbl_name, CHECK_NULL);
1803 }
1804 }
1805 return localvariable_table_start;
1806 }
1807
1808 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1809 u4 code_attribute_length,
1810 TRAPS) {
1811 assert(cfs != nullptr, "invariant");
1812
1813 if (0 == code_attribute_length) {
1814 return nullptr;
1815 }
1816
1817 const u1* const stackmap_table_start = cfs->current();
1818 assert(stackmap_table_start != nullptr, "null stackmap table");
1819
1820 // check code_attribute_length
1821 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1822
1823 return stackmap_table_start;
1824 }
1825
1826 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1827 u2* const checked_exceptions_length,
1828 u4 method_attribute_length,
1829 TRAPS) {
1830 assert(cfs != nullptr, "invariant");
1831 assert(checked_exceptions_length != nullptr, "invariant");
1832
1833 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1834 *checked_exceptions_length = cfs->get_u2_fast();
1835 const unsigned int size =
1836 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1837 const unsafe_u2* const checked_exceptions_start = cfs->current();
1838 assert(checked_exceptions_start != nullptr, "null checked exceptions");
1839 if (!_need_verify) {
1840 cfs->skip_u2_fast(size);
1841 } else {
1842 // Verify each value in the checked exception table
1843 u2 checked_exception;
1844 const u2 len = *checked_exceptions_length;
1845 cfs->guarantee_more(2 * len, CHECK_NULL);
1846 for (int i = 0; i < len; i++) {
1847 checked_exception = cfs->get_u2_fast();
1848 check_property(
1849 valid_klass_reference_at(checked_exception),
1850 "Exception name has bad type at constant pool %u in class file %s",
1851 checked_exception, CHECK_NULL);
1852 }
1853 }
1854 // check exceptions attribute length
1855 if (_need_verify) {
1856 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1857 sizeof(u2) * size),
1858 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1859 }
1860 return checked_exceptions_start;
1861 }
1862
1863 void ClassFileParser::throwIllegalSignature(const char* type,
1864 const Symbol* name,
1865 const Symbol* sig,
1866 TRAPS) const {
1867 assert(name != nullptr, "invariant");
1868 assert(sig != nullptr, "invariant");
1869
1870 ResourceMark rm(THREAD);
1871 Exceptions::fthrow(THREAD_AND_LOCATION,
1872 vmSymbols::java_lang_ClassFormatError(),
1873 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1874 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1875 }
1876
1877 AnnotationCollector::ID
1878 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1879 const Symbol* name,
1880 const bool can_access_vm_annotations) {
1881 const vmSymbolID sid = vmSymbols::find_sid(name);
1882 // Privileged code can use all annotations. Other code silently drops some.
1883 const bool privileged = loader_data->is_boot_class_loader_data() ||
1884 loader_data->is_platform_class_loader_data() ||
1885 can_access_vm_annotations;
1886 switch (sid) {
1887 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1888 if (_location != _in_method) break; // only allow for methods
1889 if (!privileged) break; // only allow in privileged code
1890 return _method_CallerSensitive;
1891 }
1892 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1893 if (_location != _in_method) break; // only allow for methods
1894 if (!privileged) break; // only allow in privileged code
1895 return _method_ForceInline;
1896 }
1897 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
1898 if (_location != _in_method) break; // only allow for methods
1899 if (!privileged) break; // only allow in privileged code
1900 return _method_DontInline;
1901 }
1902 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
1903 if (_location != _in_method) break; // only allow for methods
1904 if (!privileged) break; // only allow in privileged code
1905 return _method_ChangesCurrentThread;
1906 }
1907 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
1908 if (_location != _in_method) break; // only allow for methods
1909 if (!privileged) break; // only allow in privileged code
1910 return _method_JvmtiMountTransition;
1911 }
1912 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
1913 if (_location != _in_method) break; // only allow for methods
1914 if (!privileged) break; // only allow in privileged code
1915 return _method_InjectedProfile;
1916 }
1917 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
1918 if (_location != _in_method) break; // only allow for methods
1919 if (!privileged) break; // only allow in privileged code
1920 return _method_LambdaForm_Compiled;
1921 }
1922 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
1923 if (_location != _in_method) break; // only allow for methods
1924 if (!privileged) break; // only allow in privileged code
1925 return _method_Hidden;
1926 }
1927 case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
1928 if (_location != _in_method) break; // only allow for methods
1929 if (!privileged) break; // only allow in privileged code
1930 return _method_Scoped;
1931 }
1932 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
1933 if (_location != _in_method) break; // only allow for methods
1934 if (!privileged) break; // only allow in privileged code
1935 return _method_IntrinsicCandidate;
1936 }
1937 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
1938 if (_location != _in_field) break; // only allow for fields
1939 if (!privileged) break; // only allow in privileged code
1940 return _field_Stable;
1941 }
1942 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1943 if (_location != _in_field && _location != _in_class) {
1944 break; // only allow for fields and classes
1945 }
1946 if (!EnableContended || (RestrictContended && !privileged)) {
1947 break; // honor privileges
1948 }
1949 return _jdk_internal_vm_annotation_Contended;
1950 }
1951 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1952 if (_location != _in_method) break; // only allow for methods
1953 if (RestrictReservedStack && !privileged) break; // honor privileges
1954 return _jdk_internal_vm_annotation_ReservedStackAccess;
1955 }
1956 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1957 if (_location != _in_class) break; // only allow for classes
1958 if (!privileged) break; // only allow in privileged code
1959 return _jdk_internal_ValueBased;
1960 }
1961 default: {
1962 break;
1963 }
1964 }
1965 return AnnotationCollector::_unknown;
1966 }
1967
1968 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1969 if (is_contended())
1970 // Setting the contended group also sets the contended bit in field flags
1971 f->set_contended_group(contended_group());
1972 if (is_stable())
1973 (f->field_flags_addr())->update_stable(true);
1974 }
1975
1976 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1977 // If there's an error deallocate metadata for field annotations
1978 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1979 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1980 }
1981
1982 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
1983 if (has_annotation(_method_CallerSensitive))
1984 m->set_caller_sensitive();
1985 if (has_annotation(_method_ForceInline))
1986 m->set_force_inline();
1987 if (has_annotation(_method_DontInline))
1988 m->set_dont_inline();
1989 if (has_annotation(_method_ChangesCurrentThread))
1990 m->set_changes_current_thread();
1991 if (has_annotation(_method_JvmtiMountTransition))
1992 m->set_jvmti_mount_transition();
1993 if (has_annotation(_method_InjectedProfile))
1994 m->set_has_injected_profile();
1995 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1996 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1997 if (has_annotation(_method_Hidden))
1998 m->set_is_hidden();
1999 if (has_annotation(_method_Scoped))
2000 m->set_scoped();
2001 if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
2002 m->set_intrinsic_candidate();
2003 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2004 m->set_has_reserved_stack_access();
2005 }
2006
2007 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2008 assert(ik != nullptr, "invariant");
2009 if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
2010 ik->set_is_contended(is_contended());
2011 }
2012 if (has_annotation(_jdk_internal_ValueBased)) {
2013 ik->set_has_value_based_class_annotation();
2014 if (DiagnoseSyncOnValueBasedClasses) {
2015 ik->set_is_value_based();
2016 }
2017 }
2018 }
2019
2020 #define MAX_ARGS_SIZE 255
2021 #define MAX_CODE_SIZE 65535
2022 #define INITIAL_MAX_LVT_NUMBER 256
2023
2024 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2025 *
2026 * Rules for LVT's and LVTT's are:
2027 * - There can be any number of LVT's and LVTT's.
2028 * - If there are n LVT's, it is the same as if there was just
2029 * one LVT containing all the entries from the n LVT's.
2030 * - There may be no more than one LVT entry per local variable.
2031 * Two LVT entries are 'equal' if these fields are the same:
2032 * start_pc, length, name, slot
2033 * - There may be no more than one LVTT entry per each LVT entry.
2034 * Each LVTT entry has to match some LVT entry.
2035 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2036 */
2037 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2038 int lvt_cnt,
2039 u2* const localvariable_table_length,
2040 const unsafe_u2** const localvariable_table_start,
2041 int lvtt_cnt,
2042 u2* const localvariable_type_table_length,
2043 const unsafe_u2** const localvariable_type_table_start,
2044 TRAPS) {
2045
2046 ResourceMark rm(THREAD);
2047
2048 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2049 256, AnyObj::RESOURCE_AREA, mtInternal,
2050 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2051
2052 LVT_HashTable* const table = new LVT_HashTable();
2053
2054 // To fill LocalVariableTable in
2055 const Classfile_LVT_Element* cf_lvt;
2056 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2057
2058 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2059 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2060 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2061 copy_lvt_element(&cf_lvt[idx], lvt);
2062 // If no duplicates, add LVT elem in hashtable.
2063 if (table->put(*lvt, lvt) == false
2064 && _need_verify
2065 && _major_version >= JAVA_1_5_VERSION) {
2066 classfile_parse_error("Duplicated LocalVariableTable attribute "
2067 "entry for '%s' in class file %s",
2068 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2069 THREAD);
2070 return;
2071 }
2072 }
2073 }
2074
2075 // To merge LocalVariableTable and LocalVariableTypeTable
2076 const Classfile_LVT_Element* cf_lvtt;
2077 LocalVariableTableElement lvtt_elem;
2078
2079 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2080 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2081 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2082 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2083 LocalVariableTableElement** entry = table->get(lvtt_elem);
2084 if (entry == nullptr) {
2085 if (_need_verify) {
2086 classfile_parse_error("LVTT entry for '%s' in class file %s "
2087 "does not match any LVT entry",
2088 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2089 THREAD);
2090 return;
2091 }
2092 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2093 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2094 "entry for '%s' in class file %s",
2095 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2096 THREAD);
2097 return;
2098 } else {
2099 // to add generic signatures into LocalVariableTable
2100 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2101 }
2102 }
2103 }
2104 }
2105
2106
2107 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2108 const u1* runtime_visible_annotations,
2109 int runtime_visible_annotations_length,
2110 const u1* runtime_invisible_annotations,
2111 int runtime_invisible_annotations_length,
2112 const u1* runtime_visible_parameter_annotations,
2113 int runtime_visible_parameter_annotations_length,
2114 const u1* runtime_invisible_parameter_annotations,
2115 int runtime_invisible_parameter_annotations_length,
2116 const u1* runtime_visible_type_annotations,
2117 int runtime_visible_type_annotations_length,
2118 const u1* runtime_invisible_type_annotations,
2119 int runtime_invisible_type_annotations_length,
2120 const u1* annotation_default,
2121 int annotation_default_length,
2122 TRAPS) {
2123
2124 AnnotationArray* a;
2125
2126 if (runtime_visible_annotations_length +
2127 runtime_invisible_annotations_length > 0) {
2128 a = assemble_annotations(runtime_visible_annotations,
2129 runtime_visible_annotations_length,
2130 runtime_invisible_annotations,
2131 runtime_invisible_annotations_length,
2132 CHECK);
2133 cm->set_method_annotations(a);
2134 }
2135
2136 if (runtime_visible_parameter_annotations_length +
2137 runtime_invisible_parameter_annotations_length > 0) {
2138 a = assemble_annotations(runtime_visible_parameter_annotations,
2139 runtime_visible_parameter_annotations_length,
2140 runtime_invisible_parameter_annotations,
2141 runtime_invisible_parameter_annotations_length,
2142 CHECK);
2143 cm->set_parameter_annotations(a);
2144 }
2145
2146 if (annotation_default_length > 0) {
2147 a = assemble_annotations(annotation_default,
2148 annotation_default_length,
2149 nullptr,
2150 0,
2151 CHECK);
2152 cm->set_default_annotations(a);
2153 }
2154
2155 if (runtime_visible_type_annotations_length +
2156 runtime_invisible_type_annotations_length > 0) {
2157 a = assemble_annotations(runtime_visible_type_annotations,
2158 runtime_visible_type_annotations_length,
2159 runtime_invisible_type_annotations,
2160 runtime_invisible_type_annotations_length,
2161 CHECK);
2162 cm->set_type_annotations(a);
2163 }
2164 }
2165
2166
2167 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2168 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2169 // Method* to save footprint, so we only know the size of the resulting Method* when the
2170 // entire method attribute is parsed.
2171 //
2172 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2173
2174 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2175 bool is_interface,
2176 const ConstantPool* cp,
2177 bool* const has_localvariable_table,
2178 TRAPS) {
2179 assert(cfs != nullptr, "invariant");
2180 assert(cp != nullptr, "invariant");
2181 assert(has_localvariable_table != nullptr, "invariant");
2182
2183 ResourceMark rm(THREAD);
2184 // Parse fixed parts:
2185 // access_flags, name_index, descriptor_index, attributes_count
2186 cfs->guarantee_more(8, CHECK_NULL);
2187
2188 int flags = cfs->get_u2_fast();
2189 const u2 name_index = cfs->get_u2_fast();
2190 const int cp_size = cp->length();
2191 check_property(
2192 valid_symbol_at(name_index),
2193 "Illegal constant pool index %u for method name in class file %s",
2194 name_index, CHECK_NULL);
2195 const Symbol* const name = cp->symbol_at(name_index);
2196 verify_legal_method_name(name, CHECK_NULL);
2197
2198 const u2 signature_index = cfs->get_u2_fast();
2199 guarantee_property(
2200 valid_symbol_at(signature_index),
2201 "Illegal constant pool index %u for method signature in class file %s",
2202 signature_index, CHECK_NULL);
2203 const Symbol* const signature = cp->symbol_at(signature_index);
2204
2205 if (name == vmSymbols::class_initializer_name()) {
2206 // We ignore the other access flags for a valid class initializer.
2207 // (JVM Spec 2nd ed., chapter 4.6)
2208 if (_major_version < 51) { // backward compatibility
2209 flags = JVM_ACC_STATIC;
2210 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2211 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2212 } else {
2213 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2214 return nullptr;
2215 }
2216 } else {
2217 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2218 }
2219
2220 if (name == vmSymbols::object_initializer_name() && is_interface) {
2221 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2222 return nullptr;
2223 }
2224
2225 int args_size = -1; // only used when _need_verify is true
2226 if (_need_verify) {
2227 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2228 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2229 verify_legal_method_signature(name, signature, CHECK_NULL);
2230 if (args_size > MAX_ARGS_SIZE) {
2231 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2232 return nullptr;
2233 }
2234 }
2235
2236 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2237
2238 // Default values for code and exceptions attribute elements
2239 u2 max_stack = 0;
2240 u2 max_locals = 0;
2241 u4 code_length = 0;
2242 const u1* code_start = 0;
2243 u2 exception_table_length = 0;
2244 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2245 Array<int>* exception_handlers = Universe::the_empty_int_array();
2246 u2 checked_exceptions_length = 0;
2247 const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2248 CompressedLineNumberWriteStream* linenumber_table = nullptr;
2249 int linenumber_table_length = 0;
2250 int total_lvt_length = 0;
2251 u2 lvt_cnt = 0;
2252 u2 lvtt_cnt = 0;
2253 bool lvt_allocated = false;
2254 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2255 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2256 u2* localvariable_table_length = nullptr;
2257 const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes
2258 u2* localvariable_type_table_length = nullptr;
2259 const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes
2260 int method_parameters_length = -1;
2261 const u1* method_parameters_data = nullptr;
2262 bool method_parameters_seen = false;
2263 bool parsed_code_attribute = false;
2264 bool parsed_checked_exceptions_attribute = false;
2265 bool parsed_stackmap_attribute = false;
2266 // stackmap attribute - JDK1.5
2267 const u1* stackmap_data = nullptr;
2268 int stackmap_data_length = 0;
2269 u2 generic_signature_index = 0;
2270 MethodAnnotationCollector parsed_annotations;
2271 const u1* runtime_visible_annotations = nullptr;
2272 int runtime_visible_annotations_length = 0;
2273 const u1* runtime_invisible_annotations = nullptr;
2274 int runtime_invisible_annotations_length = 0;
2275 const u1* runtime_visible_parameter_annotations = nullptr;
2276 int runtime_visible_parameter_annotations_length = 0;
2277 const u1* runtime_invisible_parameter_annotations = nullptr;
2278 int runtime_invisible_parameter_annotations_length = 0;
2279 const u1* runtime_visible_type_annotations = nullptr;
2280 int runtime_visible_type_annotations_length = 0;
2281 const u1* runtime_invisible_type_annotations = nullptr;
2282 int runtime_invisible_type_annotations_length = 0;
2283 bool runtime_invisible_annotations_exists = false;
2284 bool runtime_invisible_type_annotations_exists = false;
2285 bool runtime_invisible_parameter_annotations_exists = false;
2286 const u1* annotation_default = nullptr;
2287 int annotation_default_length = 0;
2288
2289 // Parse code and exceptions attribute
2290 u2 method_attributes_count = cfs->get_u2_fast();
2291 while (method_attributes_count--) {
2292 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2293 const u2 method_attribute_name_index = cfs->get_u2_fast();
2294 const u4 method_attribute_length = cfs->get_u4_fast();
2295 check_property(
2296 valid_symbol_at(method_attribute_name_index),
2297 "Invalid method attribute name index %u in class file %s",
2298 method_attribute_name_index, CHECK_NULL);
2299
2300 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2301 if (method_attribute_name == vmSymbols::tag_code()) {
2302 // Parse Code attribute
2303 if (_need_verify) {
2304 guarantee_property(
2305 !access_flags.is_native() && !access_flags.is_abstract(),
2306 "Code attribute in native or abstract methods in class file %s",
2307 CHECK_NULL);
2308 }
2309 if (parsed_code_attribute) {
2310 classfile_parse_error("Multiple Code attributes in class file %s",
2311 THREAD);
2312 return nullptr;
2313 }
2314 parsed_code_attribute = true;
2315
2316 // Stack size, locals size, and code size
2317 cfs->guarantee_more(8, CHECK_NULL);
2318 max_stack = cfs->get_u2_fast();
2319 max_locals = cfs->get_u2_fast();
2320 code_length = cfs->get_u4_fast();
2321 if (_need_verify) {
2322 guarantee_property(args_size <= max_locals,
2323 "Arguments can't fit into locals in class file %s",
2324 CHECK_NULL);
2325 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2326 "Invalid method Code length %u in class file %s",
2327 code_length, CHECK_NULL);
2328 }
2329 // Code pointer
2330 code_start = cfs->current();
2331 assert(code_start != nullptr, "null code start");
2332 cfs->guarantee_more(code_length, CHECK_NULL);
2333 cfs->skip_u1_fast(code_length);
2334
2335 // Exception handler table
2336 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2337 exception_table_length = cfs->get_u2_fast();
2338 if (exception_table_length > 0) {
2339 exception_table_start = parse_exception_table(cfs,
2340 code_length,
2341 exception_table_length,
2342 CHECK_NULL);
2343 }
2344
2345 // Parse additional attributes in code attribute
2346 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2347 u2 code_attributes_count = cfs->get_u2_fast();
2348
2349 unsigned int calculated_attribute_length = 0;
2350
2351 calculated_attribute_length =
2352 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2353 calculated_attribute_length += checked_cast<unsigned int>(
2354 code_length +
2355 sizeof(exception_table_length) +
2356 sizeof(code_attributes_count) +
2357 exception_table_length *
2358 ( sizeof(u2) + // start_pc
2359 sizeof(u2) + // end_pc
2360 sizeof(u2) + // handler_pc
2361 sizeof(u2) )); // catch_type_index
2362
2363 while (code_attributes_count--) {
2364 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2365 const u2 code_attribute_name_index = cfs->get_u2_fast();
2366 const u4 code_attribute_length = cfs->get_u4_fast();
2367 calculated_attribute_length += code_attribute_length +
2368 (unsigned)sizeof(code_attribute_name_index) +
2369 (unsigned)sizeof(code_attribute_length);
2370 check_property(valid_symbol_at(code_attribute_name_index),
2371 "Invalid code attribute name index %u in class file %s",
2372 code_attribute_name_index,
2373 CHECK_NULL);
2374 if (LoadLineNumberTables &&
2375 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2376 // Parse and compress line number table
2377 parse_linenumber_table(code_attribute_length,
2378 code_length,
2379 &linenumber_table,
2380 CHECK_NULL);
2381
2382 } else if (LoadLocalVariableTables &&
2383 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2384 // Parse local variable table
2385 if (!lvt_allocated) {
2386 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2387 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2388 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2389 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2390 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2391 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2392 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2393 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2394 lvt_allocated = true;
2395 }
2396 if (lvt_cnt == max_lvt_cnt) {
2397 max_lvt_cnt <<= 1;
2398 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2399 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2400 }
2401 localvariable_table_start[lvt_cnt] =
2402 parse_localvariable_table(cfs,
2403 code_length,
2404 max_locals,
2405 code_attribute_length,
2406 &localvariable_table_length[lvt_cnt],
2407 false, // is not LVTT
2408 CHECK_NULL);
2409 total_lvt_length += localvariable_table_length[lvt_cnt];
2410 lvt_cnt++;
2411 } else if (LoadLocalVariableTypeTables &&
2412 _major_version >= JAVA_1_5_VERSION &&
2413 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2414 if (!lvt_allocated) {
2415 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2416 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2417 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2418 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2419 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2420 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2421 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2422 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2423 lvt_allocated = true;
2424 }
2425 // Parse local variable type table
2426 if (lvtt_cnt == max_lvtt_cnt) {
2427 max_lvtt_cnt <<= 1;
2428 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2429 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2430 }
2431 localvariable_type_table_start[lvtt_cnt] =
2432 parse_localvariable_table(cfs,
2433 code_length,
2434 max_locals,
2435 code_attribute_length,
2436 &localvariable_type_table_length[lvtt_cnt],
2437 true, // is LVTT
2438 CHECK_NULL);
2439 lvtt_cnt++;
2440 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2441 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2442 // Stack map is only needed by the new verifier in JDK1.5.
2443 if (parsed_stackmap_attribute) {
2444 classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
2445 return nullptr;
2446 }
2447 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL);
2448 stackmap_data_length = code_attribute_length;
2449 parsed_stackmap_attribute = true;
2450 } else {
2451 // Skip unknown attributes
2452 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2453 }
2454 }
2455 // check method attribute length
2456 if (_need_verify) {
2457 guarantee_property(method_attribute_length == calculated_attribute_length,
2458 "Code segment has wrong length in class file %s",
2459 CHECK_NULL);
2460 }
2461 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2462 // Parse Exceptions attribute
2463 if (parsed_checked_exceptions_attribute) {
2464 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2465 THREAD);
2466 return nullptr;
2467 }
2468 parsed_checked_exceptions_attribute = true;
2469 checked_exceptions_start =
2470 parse_checked_exceptions(cfs,
2471 &checked_exceptions_length,
2472 method_attribute_length,
2473 CHECK_NULL);
2474 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2475 // reject multiple method parameters
2476 if (method_parameters_seen) {
2477 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2478 THREAD);
2479 return nullptr;
2480 }
2481 method_parameters_seen = true;
2482 method_parameters_length = cfs->get_u1_fast();
2483 const u4 real_length = (method_parameters_length * 4u) + 1u;
2484 if (method_attribute_length != real_length) {
2485 classfile_parse_error(
2486 "Invalid MethodParameters method attribute length %u in class file",
2487 method_attribute_length, THREAD);
2488 return nullptr;
2489 }
2490 method_parameters_data = cfs->current();
2491 cfs->skip_u2_fast(method_parameters_length);
2492 cfs->skip_u2_fast(method_parameters_length);
2493 // ignore this attribute if it cannot be reflected
2494 if (!vmClasses::Parameter_klass_loaded())
2495 method_parameters_length = -1;
2496 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2497 if (method_attribute_length != 0) {
2498 classfile_parse_error(
2499 "Invalid Synthetic method attribute length %u in class file %s",
2500 method_attribute_length, THREAD);
2501 return nullptr;
2502 }
2503 // Should we check that there hasn't already been a synthetic attribute?
2504 access_flags.set_is_synthetic();
2505 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2506 if (method_attribute_length != 0) {
2507 classfile_parse_error(
2508 "Invalid Deprecated method attribute length %u in class file %s",
2509 method_attribute_length, THREAD);
2510 return nullptr;
2511 }
2512 } else if (_major_version >= JAVA_1_5_VERSION) {
2513 if (method_attribute_name == vmSymbols::tag_signature()) {
2514 if (generic_signature_index != 0) {
2515 classfile_parse_error(
2516 "Multiple Signature attributes for method in class file %s",
2517 THREAD);
2518 return nullptr;
2519 }
2520 if (method_attribute_length != 2) {
2521 classfile_parse_error(
2522 "Invalid Signature attribute length %u in class file %s",
2523 method_attribute_length, THREAD);
2524 return nullptr;
2525 }
2526 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2527 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2528 if (runtime_visible_annotations != nullptr) {
2529 classfile_parse_error(
2530 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2531 THREAD);
2532 return nullptr;
2533 }
2534 runtime_visible_annotations_length = method_attribute_length;
2535 runtime_visible_annotations = cfs->current();
2536 assert(runtime_visible_annotations != nullptr, "null visible annotations");
2537 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2538 parse_annotations(cp,
2539 runtime_visible_annotations,
2540 runtime_visible_annotations_length,
2541 &parsed_annotations,
2542 _loader_data,
2543 _can_access_vm_annotations);
2544 cfs->skip_u1_fast(runtime_visible_annotations_length);
2545 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2546 if (runtime_invisible_annotations_exists) {
2547 classfile_parse_error(
2548 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2549 THREAD);
2550 return nullptr;
2551 }
2552 runtime_invisible_annotations_exists = true;
2553 if (PreserveAllAnnotations) {
2554 runtime_invisible_annotations_length = method_attribute_length;
2555 runtime_invisible_annotations = cfs->current();
2556 assert(runtime_invisible_annotations != nullptr, "null invisible annotations");
2557 }
2558 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2559 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2560 if (runtime_visible_parameter_annotations != nullptr) {
2561 classfile_parse_error(
2562 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2563 THREAD);
2564 return nullptr;
2565 }
2566 runtime_visible_parameter_annotations_length = method_attribute_length;
2567 runtime_visible_parameter_annotations = cfs->current();
2568 assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations");
2569 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2570 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2571 if (runtime_invisible_parameter_annotations_exists) {
2572 classfile_parse_error(
2573 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2574 THREAD);
2575 return nullptr;
2576 }
2577 runtime_invisible_parameter_annotations_exists = true;
2578 if (PreserveAllAnnotations) {
2579 runtime_invisible_parameter_annotations_length = method_attribute_length;
2580 runtime_invisible_parameter_annotations = cfs->current();
2581 assert(runtime_invisible_parameter_annotations != nullptr,
2582 "null invisible parameter annotations");
2583 }
2584 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2585 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2586 if (annotation_default != nullptr) {
2587 classfile_parse_error(
2588 "Multiple AnnotationDefault attributes for method in class file %s",
2589 THREAD);
2590 return nullptr;
2591 }
2592 annotation_default_length = method_attribute_length;
2593 annotation_default = cfs->current();
2594 assert(annotation_default != nullptr, "null annotation default");
2595 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2596 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2597 if (runtime_visible_type_annotations != nullptr) {
2598 classfile_parse_error(
2599 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2600 THREAD);
2601 return nullptr;
2602 }
2603 runtime_visible_type_annotations_length = method_attribute_length;
2604 runtime_visible_type_annotations = cfs->current();
2605 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
2606 // No need for the VM to parse Type annotations
2607 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2608 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2609 if (runtime_invisible_type_annotations_exists) {
2610 classfile_parse_error(
2611 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2612 THREAD);
2613 return nullptr;
2614 } else {
2615 runtime_invisible_type_annotations_exists = true;
2616 }
2617 if (PreserveAllAnnotations) {
2618 runtime_invisible_type_annotations_length = method_attribute_length;
2619 runtime_invisible_type_annotations = cfs->current();
2620 assert(runtime_invisible_type_annotations != nullptr, "null invisible type annotations");
2621 }
2622 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2623 } else {
2624 // Skip unknown attributes
2625 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2626 }
2627 } else {
2628 // Skip unknown attributes
2629 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2630 }
2631 }
2632
2633 if (linenumber_table != nullptr) {
2634 linenumber_table->write_terminator();
2635 linenumber_table_length = linenumber_table->position();
2636 }
2637
2638 // Make sure there's at least one Code attribute in non-native/non-abstract method
2639 if (_need_verify) {
2640 guarantee_property(access_flags.is_native() ||
2641 access_flags.is_abstract() ||
2642 parsed_code_attribute,
2643 "Absent Code attribute in method that is not native or abstract in class file %s",
2644 CHECK_NULL);
2645 }
2646
2647 // All sizing information for a Method* is finally available, now create it
2648 InlineTableSizes sizes(
2649 total_lvt_length,
2650 linenumber_table_length,
2651 exception_table_length,
2652 checked_exceptions_length,
2653 method_parameters_length,
2654 generic_signature_index,
2655 runtime_visible_annotations_length +
2656 runtime_invisible_annotations_length,
2657 runtime_visible_parameter_annotations_length +
2658 runtime_invisible_parameter_annotations_length,
2659 runtime_visible_type_annotations_length +
2660 runtime_invisible_type_annotations_length,
2661 annotation_default_length,
2662 0);
2663
2664 Method* const m = Method::allocate(_loader_data,
2665 code_length,
2666 access_flags,
2667 &sizes,
2668 ConstMethod::NORMAL,
2669 _cp->symbol_at(name_index),
2670 CHECK_NULL);
2671
2672 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2673
2674 // Fill in information from fixed part (access_flags already set)
2675 m->set_constants(_cp);
2676 m->set_name_index(name_index);
2677 m->set_signature_index(signature_index);
2678 m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static());
2679 assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2680
2681 // Fill in code attribute information
2682 m->set_max_stack(max_stack);
2683 m->set_max_locals(max_locals);
2684 if (stackmap_data != nullptr) {
2685 m->constMethod()->copy_stackmap_data(_loader_data,
2686 (u1*)stackmap_data,
2687 stackmap_data_length,
2688 CHECK_NULL);
2689 }
2690
2691 // Copy byte codes
2692 m->set_code((u1*)code_start);
2693
2694 // Copy line number table
2695 if (linenumber_table != nullptr) {
2696 memcpy(m->compressed_linenumber_table(),
2697 linenumber_table->buffer(),
2698 linenumber_table_length);
2699 }
2700
2701 // Copy exception table
2702 if (exception_table_length > 0) {
2703 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2704 m->exception_table_start(),
2705 exception_table_length * sizeof(ExceptionTableElement),
2706 sizeof(u2));
2707 }
2708
2709 // Copy method parameters
2710 if (method_parameters_length > 0) {
2711 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2712 for (int i = 0; i < method_parameters_length; i++) {
2713 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2714 method_parameters_data += 2;
2715 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2716 method_parameters_data += 2;
2717 }
2718 }
2719
2720 // Copy checked exceptions
2721 if (checked_exceptions_length > 0) {
2722 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2723 m->checked_exceptions_start(),
2724 checked_exceptions_length * sizeof(CheckedExceptionElement),
2725 sizeof(u2));
2726 }
2727
2728 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2729 if (total_lvt_length > 0) {
2730 *has_localvariable_table = true;
2731 copy_localvariable_table(m->constMethod(),
2732 lvt_cnt,
2733 localvariable_table_length,
2734 localvariable_table_start,
2735 lvtt_cnt,
2736 localvariable_type_table_length,
2737 localvariable_type_table_start,
2738 CHECK_NULL);
2739 }
2740
2741 if (parsed_annotations.has_any_annotations())
2742 parsed_annotations.apply_to(methodHandle(THREAD, m));
2743
2744 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2745 m->set_is_hidden();
2746 }
2747
2748 // Copy annotations
2749 copy_method_annotations(m->constMethod(),
2750 runtime_visible_annotations,
2751 runtime_visible_annotations_length,
2752 runtime_invisible_annotations,
2753 runtime_invisible_annotations_length,
2754 runtime_visible_parameter_annotations,
2755 runtime_visible_parameter_annotations_length,
2756 runtime_invisible_parameter_annotations,
2757 runtime_invisible_parameter_annotations_length,
2758 runtime_visible_type_annotations,
2759 runtime_visible_type_annotations_length,
2760 runtime_invisible_type_annotations,
2761 runtime_invisible_type_annotations_length,
2762 annotation_default,
2763 annotation_default_length,
2764 CHECK_NULL);
2765
2766 if (InstanceKlass::is_finalization_enabled() &&
2767 name == vmSymbols::finalize_method_name() &&
2768 signature == vmSymbols::void_method_signature()) {
2769 if (m->is_empty_method()) {
2770 _has_empty_finalizer = true;
2771 } else {
2772 _has_finalizer = true;
2773 }
2774 }
2775 if (name == vmSymbols::object_initializer_name() &&
2776 signature == vmSymbols::void_method_signature() &&
2777 m->is_vanilla_constructor()) {
2778 _has_vanilla_constructor = true;
2779 }
2780
2781 NOT_PRODUCT(m->verify());
2782 return m;
2783 }
2784
2785
2786 // Side-effects: populates the _methods field in the parser
2787 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2788 bool is_interface,
2789 bool* const has_localvariable_table,
2790 bool* has_final_method,
2791 bool* declares_nonstatic_concrete_methods,
2792 TRAPS) {
2793 assert(cfs != nullptr, "invariant");
2794 assert(has_localvariable_table != nullptr, "invariant");
2795 assert(has_final_method != nullptr, "invariant");
2796 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2797
2798 assert(nullptr == _methods, "invariant");
2799
2800 cfs->guarantee_more(2, CHECK); // length
2801 const u2 length = cfs->get_u2_fast();
2802 if (length == 0) {
2803 _methods = Universe::the_empty_method_array();
2804 } else {
2805 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2806 length,
2807 nullptr,
2808 CHECK);
2809
2810 for (int index = 0; index < length; index++) {
2811 Method* method = parse_method(cfs,
2812 is_interface,
2813 _cp,
2814 has_localvariable_table,
2815 CHECK);
2816
2817 if (method->is_final()) {
2818 *has_final_method = true;
2819 }
2820 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2821 // used for interface initialization, and default method inheritance analysis
2822 if (is_interface && !(*declares_nonstatic_concrete_methods)
2823 && !method->is_abstract() && !method->is_static()) {
2824 *declares_nonstatic_concrete_methods = true;
2825 }
2826 _methods->at_put(index, method);
2827 }
2828
2829 if (_need_verify && length > 1) {
2830 // Check duplicated methods
2831 ResourceMark rm(THREAD);
2832 // Set containing name-signature pairs
2833 NameSigHashtable* names_and_sigs = new NameSigHashtable();
2834 for (int i = 0; i < length; i++) {
2835 const Method* const m = _methods->at(i);
2836 NameSigHash name_and_sig(m->name(), m->signature());
2837 // If no duplicates, add name/signature in hashtable names_and_sigs.
2838 if(!names_and_sigs->put(name_and_sig, 0)) {
2839 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2840 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
2841 return;
2842 }
2843 }
2844 }
2845 }
2846 }
2847
2848 static const intArray* sort_methods(Array<Method*>* methods) {
2849 const int length = methods->length();
2850 // If JVMTI original method ordering or sharing is enabled we have to
2851 // remember the original class file ordering.
2852 // We temporarily use the vtable_index field in the Method* to store the
2853 // class file index, so we can read in after calling qsort.
2854 // Put the method ordering in the shared archive.
2855 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) {
2856 for (int index = 0; index < length; index++) {
2857 Method* const m = methods->at(index);
2858 assert(!m->valid_vtable_index(), "vtable index should not be set");
2859 m->set_vtable_index(index);
2860 }
2861 }
2862 // Sort method array by ascending method name (for faster lookups & vtable construction)
2863 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2864 Method::sort_methods(methods);
2865
2866 intArray* method_ordering = nullptr;
2867 // If JVMTI original method ordering or sharing is enabled construct int
2868 // array remembering the original ordering
2869 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) {
2870 method_ordering = new intArray(length, length, -1);
2871 for (int index = 0; index < length; index++) {
2872 Method* const m = methods->at(index);
2873 const int old_index = m->vtable_index();
2874 assert(old_index >= 0 && old_index < length, "invalid method index");
2875 method_ordering->at_put(index, old_index);
2876 m->set_vtable_index(Method::invalid_vtable_index);
2877 }
2878 }
2879 return method_ordering;
2880 }
2881
2882 // Parse generic_signature attribute for methods and fields
2883 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
2884 TRAPS) {
2885 assert(cfs != nullptr, "invariant");
2886
2887 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2888 const u2 generic_signature_index = cfs->get_u2_fast();
2889 check_property(
2890 valid_symbol_at(generic_signature_index),
2891 "Invalid Signature attribute at constant pool index %u in class file %s",
2892 generic_signature_index, CHECK_0);
2893 return generic_signature_index;
2894 }
2895
2896 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
2897 TRAPS) {
2898
2899 assert(cfs != nullptr, "invariant");
2900
2901 cfs->guarantee_more(2, CHECK); // sourcefile_index
2902 const u2 sourcefile_index = cfs->get_u2_fast();
2903 check_property(
2904 valid_symbol_at(sourcefile_index),
2905 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2906 sourcefile_index, CHECK);
2907 set_class_sourcefile_index(sourcefile_index);
2908 }
2909
2910 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
2911 int length,
2912 TRAPS) {
2913 assert(cfs != nullptr, "invariant");
2914
2915 const u1* const sde_buffer = cfs->current();
2916 assert(sde_buffer != nullptr, "null sde buffer");
2917
2918 // Don't bother storing it if there is no way to retrieve it
2919 if (JvmtiExport::can_get_source_debug_extension()) {
2920 assert((length+1) > length, "Overflow checking");
2921 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2922 for (int i = 0; i < length; i++) {
2923 sde[i] = sde_buffer[i];
2924 }
2925 sde[length] = '\0';
2926 set_class_sde_buffer((const char*)sde, length);
2927 }
2928 // Got utf8 string, set stream position forward
2929 cfs->skip_u1(length, CHECK);
2930 }
2931
2932
2933 // Inner classes can be static, private or protected (classic VM does this)
2934 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
2935 JVM_ACC_PRIVATE | \
2936 JVM_ACC_PROTECTED | \
2937 JVM_ACC_STATIC \
2938 )
2939
2940 // Find index of the InnerClasses entry for the specified inner_class_info_index.
2941 // Return -1 if none is found.
2942 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2943 Symbol* cp_klass_name = cp->klass_name_at(inner);
2944 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2945 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2946 if (cp->klass_name_at(idx_inner) == cp_klass_name) {
2947 return idx;
2948 }
2949 }
2950 return -1;
2951 }
2952
2953 // Return the outer_class_info_index for the InnerClasses entry containing the
2954 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found.
2955 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2956 if (inner == 0) return -1;
2957 int idx = inner_classes_find_index(inner_classes, inner, cp, length);
2958 if (idx == -1) return -1;
2959 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2960 return result;
2961 }
2962
2963 // Return true if circularity is found, false if no circularity is found.
2964 // Use Floyd's cycle finding algorithm.
2965 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
2966 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2967 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2968
2969 while (fast != -1 && fast != 0) {
2970 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
2971 return true; // found a circularity
2972 }
2973 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
2974 if (fast == -1) return false;
2975 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
2976 if (fast == -1) return false;
2977 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
2978 assert(slow != -1, "sanity check");
2979 }
2980 return false;
2981 }
2982
2983 // Loop through each InnerClasses entry checking for circularities and duplications
2984 // with other entries. If duplicate entries are found then throw CFE. Otherwise,
2985 // return true if a circularity or entries with duplicate inner_class_info_indexes
2986 // are found.
2987 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
2988 // Loop through each InnerClasses entry.
2989 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2990 // Return true if there are circular entries.
2991 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
2992 return true;
2993 }
2994 // Check if there are duplicate entries or entries with the same inner_class_info_index.
2995 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
2996 y += InstanceKlass::inner_class_next_offset) {
2997
2998 // 4347400: make sure there's no duplicate entry in the classes array
2999 if (_major_version >= JAVA_1_5_VERSION) {
3000 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
3001 _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
3002 _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
3003 _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
3004 "Duplicate entry in InnerClasses attribute in class file %s",
3005 CHECK_(true));
3006 }
3007 // Return true if there are two entries with the same inner_class_info_index.
3008 if (_inner_classes->at(y) == _inner_classes->at(idx)) {
3009 return true;
3010 }
3011 }
3012 }
3013 return false;
3014 }
3015
3016 // Return number of classes in the inner classes attribute table
3017 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3018 const ConstantPool* cp,
3019 const u1* const inner_classes_attribute_start,
3020 bool parsed_enclosingmethod_attribute,
3021 u2 enclosing_method_class_index,
3022 u2 enclosing_method_method_index,
3023 TRAPS) {
3024 const u1* const current_mark = cfs->current();
3025 u2 length = 0;
3026 if (inner_classes_attribute_start != nullptr) {
3027 cfs->set_current(inner_classes_attribute_start);
3028 cfs->guarantee_more(2, CHECK_0); // length
3029 length = cfs->get_u2_fast();
3030 }
3031
3032 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3033 // method data:
3034 // [inner_class_info_index,
3035 // outer_class_info_index,
3036 // inner_name_index,
3037 // inner_class_access_flags,
3038 // ...
3039 // enclosing_method_class_index,
3040 // enclosing_method_method_index]
3041 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3042 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3043 _inner_classes = inner_classes;
3044
3045 int index = 0;
3046 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3047 for (int n = 0; n < length; n++) {
3048 // Inner class index
3049 const u2 inner_class_info_index = cfs->get_u2_fast();
3050 check_property(
3051 valid_klass_reference_at(inner_class_info_index),
3052 "inner_class_info_index %u has bad constant type in class file %s",
3053 inner_class_info_index, CHECK_0);
3054 // Outer class index
3055 const u2 outer_class_info_index = cfs->get_u2_fast();
3056 check_property(
3057 outer_class_info_index == 0 ||
3058 valid_klass_reference_at(outer_class_info_index),
3059 "outer_class_info_index %u has bad constant type in class file %s",
3060 outer_class_info_index, CHECK_0);
3061
3062 if (outer_class_info_index != 0) {
3063 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3064 char* bytes = (char*)outer_class_name->bytes();
3065 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3066 "Outer class is an array class in class file %s", CHECK_0);
3067 }
3068 // Inner class name
3069 const u2 inner_name_index = cfs->get_u2_fast();
3070 check_property(
3071 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3072 "inner_name_index %u has bad constant type in class file %s",
3073 inner_name_index, CHECK_0);
3074 if (_need_verify) {
3075 guarantee_property(inner_class_info_index != outer_class_info_index,
3076 "Class is both outer and inner class in class file %s", CHECK_0);
3077 }
3078 // Access flags
3079 jint flags;
3080 // JVM_ACC_MODULE is defined in JDK-9 and later.
3081 if (_major_version >= JAVA_9_VERSION) {
3082 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3083 } else {
3084 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3085 }
3086 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3087 // Set abstract bit for old class files for backward compatibility
3088 flags |= JVM_ACC_ABSTRACT;
3089 }
3090 verify_legal_class_modifiers(flags, CHECK_0);
3091 AccessFlags inner_access_flags(flags);
3092
3093 inner_classes->at_put(index++, inner_class_info_index);
3094 inner_classes->at_put(index++, outer_class_info_index);
3095 inner_classes->at_put(index++, inner_name_index);
3096 inner_classes->at_put(index++, inner_access_flags.as_short());
3097 }
3098
3099 // Check for circular and duplicate entries.
3100 bool has_circularity = false;
3101 if (_need_verify) {
3102 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3103 if (has_circularity) {
3104 // If circularity check failed then ignore InnerClasses attribute.
3105 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3106 index = 0;
3107 if (parsed_enclosingmethod_attribute) {
3108 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3109 _inner_classes = inner_classes;
3110 } else {
3111 _inner_classes = Universe::the_empty_short_array();
3112 }
3113 }
3114 }
3115 // Set EnclosingMethod class and method indexes.
3116 if (parsed_enclosingmethod_attribute) {
3117 inner_classes->at_put(index++, enclosing_method_class_index);
3118 inner_classes->at_put(index++, enclosing_method_method_index);
3119 }
3120 assert(index == size || has_circularity, "wrong size");
3121
3122 // Restore buffer's current position.
3123 cfs->set_current(current_mark);
3124
3125 return length;
3126 }
3127
3128 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3129 const u1* const nest_members_attribute_start,
3130 TRAPS) {
3131 const u1* const current_mark = cfs->current();
3132 u2 length = 0;
3133 if (nest_members_attribute_start != nullptr) {
3134 cfs->set_current(nest_members_attribute_start);
3135 cfs->guarantee_more(2, CHECK_0); // length
3136 length = cfs->get_u2_fast();
3137 }
3138 const int size = length;
3139 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3140 _nest_members = nest_members;
3141
3142 int index = 0;
3143 cfs->guarantee_more(2 * length, CHECK_0);
3144 for (int n = 0; n < length; n++) {
3145 const u2 class_info_index = cfs->get_u2_fast();
3146 check_property(
3147 valid_klass_reference_at(class_info_index),
3148 "Nest member class_info_index %u has bad constant type in class file %s",
3149 class_info_index, CHECK_0);
3150 nest_members->at_put(index++, class_info_index);
3151 }
3152 assert(index == size, "wrong size");
3153
3154 // Restore buffer's current position.
3155 cfs->set_current(current_mark);
3156
3157 return length;
3158 }
3159
3160 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3161 const u1* const permitted_subclasses_attribute_start,
3162 TRAPS) {
3163 const u1* const current_mark = cfs->current();
3164 u2 length = 0;
3165 if (permitted_subclasses_attribute_start != nullptr) {
3166 cfs->set_current(permitted_subclasses_attribute_start);
3167 cfs->guarantee_more(2, CHECK_0); // length
3168 length = cfs->get_u2_fast();
3169 }
3170 const int size = length;
3171 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3172 _permitted_subclasses = permitted_subclasses;
3173
3174 if (length > 0) {
3175 int index = 0;
3176 cfs->guarantee_more(2 * length, CHECK_0);
3177 for (int n = 0; n < length; n++) {
3178 const u2 class_info_index = cfs->get_u2_fast();
3179 check_property(
3180 valid_klass_reference_at(class_info_index),
3181 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3182 class_info_index, CHECK_0);
3183 permitted_subclasses->at_put(index++, class_info_index);
3184 }
3185 assert(index == size, "wrong size");
3186 }
3187
3188 // Restore buffer's current position.
3189 cfs->set_current(current_mark);
3190
3191 return length;
3192 }
3193
3194 // Record {
3195 // u2 attribute_name_index;
3196 // u4 attribute_length;
3197 // u2 components_count;
3198 // component_info components[components_count];
3199 // }
3200 // component_info {
3201 // u2 name_index;
3202 // u2 descriptor_index
3203 // u2 attributes_count;
3204 // attribute_info_attributes[attributes_count];
3205 // }
3206 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3207 const ConstantPool* cp,
3208 const u1* const record_attribute_start,
3209 TRAPS) {
3210 const u1* const current_mark = cfs->current();
3211 int components_count = 0;
3212 unsigned int calculate_attr_size = 0;
3213 if (record_attribute_start != nullptr) {
3214 cfs->set_current(record_attribute_start);
3215 cfs->guarantee_more(2, CHECK_0); // num of components
3216 components_count = (int)cfs->get_u2_fast();
3217 calculate_attr_size = 2;
3218 }
3219
3220 Array<RecordComponent*>* const record_components =
3221 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0);
3222 _record_components = record_components;
3223
3224 for (int x = 0; x < components_count; x++) {
3225 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3226
3227 const u2 name_index = cfs->get_u2_fast();
3228 check_property(valid_symbol_at(name_index),
3229 "Invalid constant pool index %u for name in Record attribute in class file %s",
3230 name_index, CHECK_0);
3231 const Symbol* const name = cp->symbol_at(name_index);
3232 verify_legal_field_name(name, CHECK_0);
3233
3234 const u2 descriptor_index = cfs->get_u2_fast();
3235 check_property(valid_symbol_at(descriptor_index),
3236 "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3237 descriptor_index, CHECK_0);
3238 const Symbol* const descr = cp->symbol_at(descriptor_index);
3239 verify_legal_field_signature(name, descr, CHECK_0);
3240
3241 const u2 attributes_count = cfs->get_u2_fast();
3242 calculate_attr_size += 6;
3243 u2 generic_sig_index = 0;
3244 const u1* runtime_visible_annotations = nullptr;
3245 int runtime_visible_annotations_length = 0;
3246 const u1* runtime_invisible_annotations = nullptr;
3247 int runtime_invisible_annotations_length = 0;
3248 bool runtime_invisible_annotations_exists = false;
3249 const u1* runtime_visible_type_annotations = nullptr;
3250 int runtime_visible_type_annotations_length = 0;
3251 const u1* runtime_invisible_type_annotations = nullptr;
3252 int runtime_invisible_type_annotations_length = 0;
3253 bool runtime_invisible_type_annotations_exists = false;
3254
3255 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3256 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
3257 for (int y = 0; y < attributes_count; y++) {
3258 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
3259 const u2 attribute_name_index = cfs->get_u2_fast();
3260 const u4 attribute_length = cfs->get_u4_fast();
3261 calculate_attr_size += 6;
3262 check_property(
3263 valid_symbol_at(attribute_name_index),
3264 "Invalid Record attribute name index %u in class file %s",
3265 attribute_name_index, CHECK_0);
3266
3267 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3268 if (attribute_name == vmSymbols::tag_signature()) {
3269 if (generic_sig_index != 0) {
3270 classfile_parse_error(
3271 "Multiple Signature attributes for Record component in class file %s",
3272 THREAD);
3273 return 0;
3274 }
3275 if (attribute_length != 2) {
3276 classfile_parse_error(
3277 "Invalid Signature attribute length %u in Record component in class file %s",
3278 attribute_length, THREAD);
3279 return 0;
3280 }
3281 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3282
3283 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3284 if (runtime_visible_annotations != nullptr) {
3285 classfile_parse_error(
3286 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
3287 return 0;
3288 }
3289 runtime_visible_annotations_length = attribute_length;
3290 runtime_visible_annotations = cfs->current();
3291
3292 assert(runtime_visible_annotations != nullptr, "null record component visible annotation");
3293 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3294 cfs->skip_u1_fast(runtime_visible_annotations_length);
3295
3296 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3297 if (runtime_invisible_annotations_exists) {
3298 classfile_parse_error(
3299 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
3300 return 0;
3301 }
3302 runtime_invisible_annotations_exists = true;
3303 if (PreserveAllAnnotations) {
3304 runtime_invisible_annotations_length = attribute_length;
3305 runtime_invisible_annotations = cfs->current();
3306 assert(runtime_invisible_annotations != nullptr, "null record component invisible annotation");
3307 }
3308 cfs->skip_u1(attribute_length, CHECK_0);
3309
3310 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3311 if (runtime_visible_type_annotations != nullptr) {
3312 classfile_parse_error(
3313 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3314 return 0;
3315 }
3316 runtime_visible_type_annotations_length = attribute_length;
3317 runtime_visible_type_annotations = cfs->current();
3318
3319 assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation");
3320 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3321 cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3322
3323 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3324 if (runtime_invisible_type_annotations_exists) {
3325 classfile_parse_error(
3326 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3327 return 0;
3328 }
3329 runtime_invisible_type_annotations_exists = true;
3330 if (PreserveAllAnnotations) {
3331 runtime_invisible_type_annotations_length = attribute_length;
3332 runtime_invisible_type_annotations = cfs->current();
3333 assert(runtime_invisible_type_annotations != nullptr, "null record component invisible type annotation");
3334 }
3335 cfs->skip_u1(attribute_length, CHECK_0);
3336
3337 } else {
3338 // Skip unknown attributes
3339 cfs->skip_u1(attribute_length, CHECK_0);
3340 }
3341 calculate_attr_size += attribute_length;
3342 } // End of attributes For loop
3343
3344 AnnotationArray* annotations = assemble_annotations(runtime_visible_annotations,
3345 runtime_visible_annotations_length,
3346 runtime_invisible_annotations,
3347 runtime_invisible_annotations_length,
3348 CHECK_0);
3349 AnnotationArray* type_annotations = assemble_annotations(runtime_visible_type_annotations,
3350 runtime_visible_type_annotations_length,
3351 runtime_invisible_type_annotations,
3352 runtime_invisible_type_annotations_length,
3353 CHECK_0);
3354
3355 RecordComponent* record_component =
3356 RecordComponent::allocate(_loader_data, name_index, descriptor_index,
3357 attributes_count, generic_sig_index,
3358 annotations, type_annotations, CHECK_0);
3359 record_components->at_put(x, record_component);
3360 } // End of component processing loop
3361
3362 // Restore buffer's current position.
3363 cfs->set_current(current_mark);
3364 return calculate_attr_size;
3365 }
3366
3367 void ClassFileParser::parse_classfile_synthetic_attribute() {
3368 set_class_synthetic_flag(true);
3369 }
3370
3371 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3372 assert(cfs != nullptr, "invariant");
3373
3374 const u2 signature_index = cfs->get_u2(CHECK);
3375 check_property(
3376 valid_symbol_at(signature_index),
3377 "Invalid constant pool index %u in Signature attribute in class file %s",
3378 signature_index, CHECK);
3379 set_class_generic_signature_index(signature_index);
3380 }
3381
3382 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3383 ConstantPool* cp,
3384 u4 attribute_byte_length,
3385 TRAPS) {
3386 assert(cfs != nullptr, "invariant");
3387 assert(cp != nullptr, "invariant");
3388
3389 const u1* const current_start = cfs->current();
3390
3391 guarantee_property(attribute_byte_length >= sizeof(u2),
3392 "Invalid BootstrapMethods attribute length %u in class file %s",
3393 attribute_byte_length,
3394 CHECK);
3395
3396 cfs->guarantee_more(attribute_byte_length, CHECK);
3397
3398 const int attribute_array_length = cfs->get_u2_fast();
3399
3400 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3401 "Short length on BootstrapMethods in class file %s",
3402 CHECK);
3403
3404
3405 // The attribute contains a counted array of counted tuples of shorts,
3406 // represending bootstrap specifiers:
3407 // length*{bootstrap_method_index, argument_count*{argument_index}}
3408 const unsigned int operand_count = (attribute_byte_length - (unsigned)sizeof(u2)) / (unsigned)sizeof(u2);
3409 // operand_count = number of shorts in attr, except for leading length
3410
3411 // The attribute is copied into a short[] array.
3412 // The array begins with a series of short[2] pairs, one for each tuple.
3413 const int index_size = (attribute_array_length * 2);
3414
3415 Array<u2>* const operands =
3416 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3417
3418 // Eagerly assign operands so they will be deallocated with the constant
3419 // pool if there is an error.
3420 cp->set_operands(operands);
3421
3422 int operand_fill_index = index_size;
3423 const int cp_size = cp->length();
3424
3425 for (int n = 0; n < attribute_array_length; n++) {
3426 // Store a 32-bit offset into the header of the operand array.
3427 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3428
3429 // Read a bootstrap specifier.
3430 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3431 const u2 bootstrap_method_index = cfs->get_u2_fast();
3432 const u2 argument_count = cfs->get_u2_fast();
3433 check_property(
3434 valid_cp_range(bootstrap_method_index, cp_size) &&
3435 cp->tag_at(bootstrap_method_index).is_method_handle(),
3436 "bootstrap_method_index %u has bad constant type in class file %s",
3437 bootstrap_method_index,
3438 CHECK);
3439
3440 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3441 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3442 CHECK);
3443
3444 operands->at_put(operand_fill_index++, bootstrap_method_index);
3445 operands->at_put(operand_fill_index++, argument_count);
3446
3447 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3448 for (int j = 0; j < argument_count; j++) {
3449 const u2 argument_index = cfs->get_u2_fast();
3450 check_property(
3451 valid_cp_range(argument_index, cp_size) &&
3452 cp->tag_at(argument_index).is_loadable_constant(),
3453 "argument_index %u has bad constant type in class file %s",
3454 argument_index,
3455 CHECK);
3456 operands->at_put(operand_fill_index++, argument_index);
3457 }
3458 }
3459 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3460 "Bad length on BootstrapMethods in class file %s",
3461 CHECK);
3462 }
3463
3464 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3465 ConstantPool* cp,
3466 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3467 TRAPS) {
3468 assert(cfs != nullptr, "invariant");
3469 assert(cp != nullptr, "invariant");
3470 assert(parsed_annotations != nullptr, "invariant");
3471
3472 // Set inner classes attribute to default sentinel
3473 _inner_classes = Universe::the_empty_short_array();
3474 // Set nest members attribute to default sentinel
3475 _nest_members = Universe::the_empty_short_array();
3476 // Set _permitted_subclasses attribute to default sentinel
3477 _permitted_subclasses = Universe::the_empty_short_array();
3478 cfs->guarantee_more(2, CHECK); // attributes_count
3479 u2 attributes_count = cfs->get_u2_fast();
3480 bool parsed_sourcefile_attribute = false;
3481 bool parsed_innerclasses_attribute = false;
3482 bool parsed_nest_members_attribute = false;
3483 bool parsed_permitted_subclasses_attribute = false;
3484 bool parsed_nest_host_attribute = false;
3485 bool parsed_record_attribute = false;
3486 bool parsed_enclosingmethod_attribute = false;
3487 bool parsed_bootstrap_methods_attribute = false;
3488 const u1* runtime_visible_annotations = nullptr;
3489 int runtime_visible_annotations_length = 0;
3490 const u1* runtime_invisible_annotations = nullptr;
3491 int runtime_invisible_annotations_length = 0;
3492 const u1* runtime_visible_type_annotations = nullptr;
3493 int runtime_visible_type_annotations_length = 0;
3494 const u1* runtime_invisible_type_annotations = nullptr;
3495 int runtime_invisible_type_annotations_length = 0;
3496 bool runtime_invisible_type_annotations_exists = false;
3497 bool runtime_invisible_annotations_exists = false;
3498 bool parsed_source_debug_ext_annotations_exist = false;
3499 const u1* inner_classes_attribute_start = nullptr;
3500 u4 inner_classes_attribute_length = 0;
3501 u2 enclosing_method_class_index = 0;
3502 u2 enclosing_method_method_index = 0;
3503 const u1* nest_members_attribute_start = nullptr;
3504 u4 nest_members_attribute_length = 0;
3505 const u1* record_attribute_start = nullptr;
3506 u4 record_attribute_length = 0;
3507 const u1* permitted_subclasses_attribute_start = nullptr;
3508 u4 permitted_subclasses_attribute_length = 0;
3509
3510 // Iterate over attributes
3511 while (attributes_count--) {
3512 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3513 const u2 attribute_name_index = cfs->get_u2_fast();
3514 const u4 attribute_length = cfs->get_u4_fast();
3515 check_property(
3516 valid_symbol_at(attribute_name_index),
3517 "Attribute name has bad constant pool index %u in class file %s",
3518 attribute_name_index, CHECK);
3519 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3520 if (tag == vmSymbols::tag_source_file()) {
3521 // Check for SourceFile tag
3522 if (_need_verify) {
3523 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3524 }
3525 if (parsed_sourcefile_attribute) {
3526 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3527 return;
3528 } else {
3529 parsed_sourcefile_attribute = true;
3530 }
3531 parse_classfile_sourcefile_attribute(cfs, CHECK);
3532 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3533 // Check for SourceDebugExtension tag
3534 if (parsed_source_debug_ext_annotations_exist) {
3535 classfile_parse_error(
3536 "Multiple SourceDebugExtension attributes in class file %s", THREAD);
3537 return;
3538 }
3539 parsed_source_debug_ext_annotations_exist = true;
3540 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3541 } else if (tag == vmSymbols::tag_inner_classes()) {
3542 // Check for InnerClasses tag
3543 if (parsed_innerclasses_attribute) {
3544 classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
3545 return;
3546 } else {
3547 parsed_innerclasses_attribute = true;
3548 }
3549 inner_classes_attribute_start = cfs->current();
3550 inner_classes_attribute_length = attribute_length;
3551 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3552 } else if (tag == vmSymbols::tag_synthetic()) {
3553 // Check for Synthetic tag
3554 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3555 if (attribute_length != 0) {
3556 classfile_parse_error(
3557 "Invalid Synthetic classfile attribute length %u in class file %s",
3558 attribute_length, THREAD);
3559 return;
3560 }
3561 parse_classfile_synthetic_attribute();
3562 } else if (tag == vmSymbols::tag_deprecated()) {
3563 // Check for Deprecated tag - 4276120
3564 if (attribute_length != 0) {
3565 classfile_parse_error(
3566 "Invalid Deprecated classfile attribute length %u in class file %s",
3567 attribute_length, THREAD);
3568 return;
3569 }
3570 } else if (_major_version >= JAVA_1_5_VERSION) {
3571 if (tag == vmSymbols::tag_signature()) {
3572 if (_generic_signature_index != 0) {
3573 classfile_parse_error(
3574 "Multiple Signature attributes in class file %s", THREAD);
3575 return;
3576 }
3577 if (attribute_length != 2) {
3578 classfile_parse_error(
3579 "Wrong Signature attribute length %u in class file %s",
3580 attribute_length, THREAD);
3581 return;
3582 }
3583 parse_classfile_signature_attribute(cfs, CHECK);
3584 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3585 if (runtime_visible_annotations != nullptr) {
3586 classfile_parse_error(
3587 "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
3588 return;
3589 }
3590 runtime_visible_annotations_length = attribute_length;
3591 runtime_visible_annotations = cfs->current();
3592 assert(runtime_visible_annotations != nullptr, "null visible annotations");
3593 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3594 parse_annotations(cp,
3595 runtime_visible_annotations,
3596 runtime_visible_annotations_length,
3597 parsed_annotations,
3598 _loader_data,
3599 _can_access_vm_annotations);
3600 cfs->skip_u1_fast(runtime_visible_annotations_length);
3601 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3602 if (runtime_invisible_annotations_exists) {
3603 classfile_parse_error(
3604 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
3605 return;
3606 }
3607 runtime_invisible_annotations_exists = true;
3608 if (PreserveAllAnnotations) {
3609 runtime_invisible_annotations_length = attribute_length;
3610 runtime_invisible_annotations = cfs->current();
3611 assert(runtime_invisible_annotations != nullptr, "null invisible annotations");
3612 }
3613 cfs->skip_u1(attribute_length, CHECK);
3614 } else if (tag == vmSymbols::tag_enclosing_method()) {
3615 if (parsed_enclosingmethod_attribute) {
3616 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
3617 return;
3618 } else {
3619 parsed_enclosingmethod_attribute = true;
3620 }
3621 guarantee_property(attribute_length == 4,
3622 "Wrong EnclosingMethod attribute length %u in class file %s",
3623 attribute_length, CHECK);
3624 cfs->guarantee_more(4, CHECK); // class_index, method_index
3625 enclosing_method_class_index = cfs->get_u2_fast();
3626 enclosing_method_method_index = cfs->get_u2_fast();
3627 if (enclosing_method_class_index == 0) {
3628 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
3629 return;
3630 }
3631 // Validate the constant pool indices and types
3632 check_property(valid_klass_reference_at(enclosing_method_class_index),
3633 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3634 if (enclosing_method_method_index != 0 &&
3635 (!cp->is_within_bounds(enclosing_method_method_index) ||
3636 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3637 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
3638 return;
3639 }
3640 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3641 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3642 if (parsed_bootstrap_methods_attribute) {
3643 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
3644 return;
3645 }
3646 parsed_bootstrap_methods_attribute = true;
3647 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3648 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3649 if (runtime_visible_type_annotations != nullptr) {
3650 classfile_parse_error(
3651 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
3652 return;
3653 }
3654 runtime_visible_type_annotations_length = attribute_length;
3655 runtime_visible_type_annotations = cfs->current();
3656 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
3657 // No need for the VM to parse Type annotations
3658 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3659 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3660 if (runtime_invisible_type_annotations_exists) {
3661 classfile_parse_error(
3662 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
3663 return;
3664 } else {
3665 runtime_invisible_type_annotations_exists = true;
3666 }
3667 if (PreserveAllAnnotations) {
3668 runtime_invisible_type_annotations_length = attribute_length;
3669 runtime_invisible_type_annotations = cfs->current();
3670 assert(runtime_invisible_type_annotations != nullptr, "null invisible type annotations");
3671 }
3672 cfs->skip_u1(attribute_length, CHECK);
3673 } else if (_major_version >= JAVA_11_VERSION) {
3674 if (tag == vmSymbols::tag_nest_members()) {
3675 // Check for NestMembers tag
3676 if (parsed_nest_members_attribute) {
3677 classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
3678 return;
3679 } else {
3680 parsed_nest_members_attribute = true;
3681 }
3682 if (parsed_nest_host_attribute) {
3683 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
3684 return;
3685 }
3686 nest_members_attribute_start = cfs->current();
3687 nest_members_attribute_length = attribute_length;
3688 cfs->skip_u1(nest_members_attribute_length, CHECK);
3689 } else if (tag == vmSymbols::tag_nest_host()) {
3690 if (parsed_nest_host_attribute) {
3691 classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
3692 return;
3693 } else {
3694 parsed_nest_host_attribute = true;
3695 }
3696 if (parsed_nest_members_attribute) {
3697 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
3698 return;
3699 }
3700 if (_need_verify) {
3701 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3702 }
3703 cfs->guarantee_more(2, CHECK);
3704 u2 class_info_index = cfs->get_u2_fast();
3705 check_property(
3706 valid_klass_reference_at(class_info_index),
3707 "Nest-host class_info_index %u has bad constant type in class file %s",
3708 class_info_index, CHECK);
3709 _nest_host = class_info_index;
3710
3711 } else if (_major_version >= JAVA_16_VERSION) {
3712 if (tag == vmSymbols::tag_record()) {
3713 if (parsed_record_attribute) {
3714 classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
3715 return;
3716 }
3717 parsed_record_attribute = true;
3718 record_attribute_start = cfs->current();
3719 record_attribute_length = attribute_length;
3720 } else if (_major_version >= JAVA_17_VERSION) {
3721 if (tag == vmSymbols::tag_permitted_subclasses()) {
3722 if (parsed_permitted_subclasses_attribute) {
3723 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3724 return;
3725 }
3726 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3727 if (_access_flags.is_final()) {
3728 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3729 return;
3730 }
3731 parsed_permitted_subclasses_attribute = true;
3732 permitted_subclasses_attribute_start = cfs->current();
3733 permitted_subclasses_attribute_length = attribute_length;
3734 }
3735 }
3736 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3737 cfs->skip_u1(attribute_length, CHECK);
3738 } else {
3739 // Unknown attribute
3740 cfs->skip_u1(attribute_length, CHECK);
3741 }
3742 } else {
3743 // Unknown attribute
3744 cfs->skip_u1(attribute_length, CHECK);
3745 }
3746 } else {
3747 // Unknown attribute
3748 cfs->skip_u1(attribute_length, CHECK);
3749 }
3750 }
3751 _class_annotations = assemble_annotations(runtime_visible_annotations,
3752 runtime_visible_annotations_length,
3753 runtime_invisible_annotations,
3754 runtime_invisible_annotations_length,
3755 CHECK);
3756 _class_type_annotations = assemble_annotations(runtime_visible_type_annotations,
3757 runtime_visible_type_annotations_length,
3758 runtime_invisible_type_annotations,
3759 runtime_invisible_type_annotations_length,
3760 CHECK);
3761
3762 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3763 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3764 cfs,
3765 cp,
3766 inner_classes_attribute_start,
3767 parsed_innerclasses_attribute,
3768 enclosing_method_class_index,
3769 enclosing_method_method_index,
3770 CHECK);
3771 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3772 guarantee_property(
3773 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3774 "Wrong InnerClasses attribute length in class file %s", CHECK);
3775 }
3776 }
3777
3778 if (parsed_nest_members_attribute) {
3779 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3780 cfs,
3781 nest_members_attribute_start,
3782 CHECK);
3783 if (_need_verify) {
3784 guarantee_property(
3785 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3786 "Wrong NestMembers attribute length in class file %s", CHECK);
3787 }
3788 }
3789
3790 if (parsed_record_attribute) {
3791 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3792 cfs,
3793 cp,
3794 record_attribute_start,
3795 CHECK);
3796 if (_need_verify) {
3797 guarantee_property(record_attribute_length == calculated_attr_length,
3798 "Record attribute has wrong length in class file %s",
3799 CHECK);
3800 }
3801 }
3802
3803 if (parsed_permitted_subclasses_attribute) {
3804 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3805 cfs,
3806 permitted_subclasses_attribute_start,
3807 CHECK);
3808 if (_need_verify) {
3809 guarantee_property(
3810 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3811 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3812 }
3813 }
3814
3815 if (_max_bootstrap_specifier_index >= 0) {
3816 guarantee_property(parsed_bootstrap_methods_attribute,
3817 "Missing BootstrapMethods attribute in class file %s", CHECK);
3818 }
3819 }
3820
3821 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3822 assert(k != nullptr, "invariant");
3823
3824 if (_synthetic_flag)
3825 k->set_is_synthetic();
3826 if (_sourcefile_index != 0) {
3827 k->set_source_file_name_index(_sourcefile_index);
3828 }
3829 if (_generic_signature_index != 0) {
3830 k->set_generic_signature_index(_generic_signature_index);
3831 }
3832 if (_sde_buffer != nullptr) {
3833 k->set_source_debug_extension(_sde_buffer, _sde_length);
3834 }
3835 }
3836
3837 // Create the Annotations object that will
3838 // hold the annotations array for the Klass.
3839 void ClassFileParser::create_combined_annotations(TRAPS) {
3840 if (_class_annotations == nullptr &&
3841 _class_type_annotations == nullptr &&
3842 _fields_annotations == nullptr &&
3843 _fields_type_annotations == nullptr) {
3844 // Don't create the Annotations object unnecessarily.
3845 return;
3846 }
3847
3848 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3849 annotations->set_class_annotations(_class_annotations);
3850 annotations->set_class_type_annotations(_class_type_annotations);
3851 annotations->set_fields_annotations(_fields_annotations);
3852 annotations->set_fields_type_annotations(_fields_type_annotations);
3853
3854 // This is the Annotations object that will be
3855 // assigned to InstanceKlass being constructed.
3856 _combined_annotations = annotations;
3857
3858 // The annotations arrays below has been transferred the
3859 // _combined_annotations so these fields can now be cleared.
3860 _class_annotations = nullptr;
3861 _class_type_annotations = nullptr;
3862 _fields_annotations = nullptr;
3863 _fields_type_annotations = nullptr;
3864 }
3865
3866 // Transfer ownership of metadata allocated to the InstanceKlass.
3867 void ClassFileParser::apply_parsed_class_metadata(
3868 InstanceKlass* this_klass,
3869 int java_fields_count) {
3870 assert(this_klass != nullptr, "invariant");
3871
3872 _cp->set_pool_holder(this_klass);
3873 this_klass->set_constants(_cp);
3874 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3875 this_klass->set_fields_status(_fields_status);
3876 this_klass->set_methods(_methods);
3877 this_klass->set_inner_classes(_inner_classes);
3878 this_klass->set_nest_members(_nest_members);
3879 this_klass->set_nest_host_index(_nest_host);
3880 this_klass->set_annotations(_combined_annotations);
3881 this_klass->set_permitted_subclasses(_permitted_subclasses);
3882 this_klass->set_record_components(_record_components);
3883 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3884 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3885 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3886 // its _super. If an OOM occurs while loading the current klass, its _super field
3887 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3888 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3889 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3890
3891 // Clear out these fields so they don't get deallocated by the destructor
3892 clear_class_metadata();
3893 }
3894
3895 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3896 int runtime_visible_annotations_length,
3897 const u1* const runtime_invisible_annotations,
3898 int runtime_invisible_annotations_length,
3899 TRAPS) {
3900 AnnotationArray* annotations = nullptr;
3901 if (runtime_visible_annotations != nullptr ||
3902 runtime_invisible_annotations != nullptr) {
3903 annotations = MetadataFactory::new_array<u1>(_loader_data,
3904 runtime_visible_annotations_length +
3905 runtime_invisible_annotations_length,
3906 CHECK_(annotations));
3907 if (runtime_visible_annotations != nullptr) {
3908 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3909 annotations->at_put(i, runtime_visible_annotations[i]);
3910 }
3911 }
3912 if (runtime_invisible_annotations != nullptr) {
3913 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3914 int append = runtime_visible_annotations_length+i;
3915 annotations->at_put(append, runtime_invisible_annotations[i]);
3916 }
3917 }
3918 }
3919 return annotations;
3920 }
3921
3922 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3923 const int super_class_index,
3924 const bool need_verify,
3925 TRAPS) {
3926 assert(cp != nullptr, "invariant");
3927 const InstanceKlass* super_klass = nullptr;
3928
3929 if (super_class_index == 0) {
3930 check_property(_class_name == vmSymbols::java_lang_Object(),
3931 "Invalid superclass index %u in class file %s",
3932 super_class_index,
3933 CHECK_NULL);
3934 } else {
3935 check_property(valid_klass_reference_at(super_class_index),
3936 "Invalid superclass index %u in class file %s",
3937 super_class_index,
3938 CHECK_NULL);
3939 // The class name should be legal because it is checked when parsing constant pool.
3940 // However, make sure it is not an array type.
3941 bool is_array = false;
3942 if (cp->tag_at(super_class_index).is_klass()) {
3943 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3944 if (need_verify)
3945 is_array = super_klass->is_array_klass();
3946 } else if (need_verify) {
3947 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3948 }
3949 if (need_verify) {
3950 guarantee_property(!is_array,
3951 "Bad superclass name in class file %s", CHECK_NULL);
3952 }
3953 }
3954 return super_klass;
3955 }
3956
3957 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3958 _max_nonstatic_oop_maps = max_blocks;
3959 _nonstatic_oop_map_count = 0;
3960 if (max_blocks == 0) {
3961 _nonstatic_oop_maps = nullptr;
3962 } else {
3963 _nonstatic_oop_maps =
3964 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
3965 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3966 }
3967 }
3968
3969 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
3970 assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
3971 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
3972 }
3973
3974 // addition of super oop maps
3975 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3976 assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
3977 nof_blocks <= _max_nonstatic_oop_maps, "invariant");
3978
3979 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3980 _nonstatic_oop_map_count += nof_blocks;
3981 }
3982
3983 // collection of oops
3984 void OopMapBlocksBuilder::add(int offset, int count) {
3985 if (_nonstatic_oop_map_count == 0) {
3986 _nonstatic_oop_map_count++;
3987 }
3988 OopMapBlock* nonstatic_oop_map = last_oop_map();
3989 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
3990 nonstatic_oop_map->set_offset(offset);
3991 nonstatic_oop_map->set_count(count);
3992 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
3993 nonstatic_oop_map->increment_count(count);
3994 } else { // Need a new one...
3995 _nonstatic_oop_map_count++;
3996 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
3997 nonstatic_oop_map = last_oop_map();
3998 nonstatic_oop_map->set_offset(offset);
3999 nonstatic_oop_map->set_count(count);
4000 }
4001 }
4002
4003 // general purpose copy, e.g. into allocated instanceKlass
4004 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
4005 if (_nonstatic_oop_map_count != 0) {
4006 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
4007 }
4008 }
4009
4010 // Sort and compact adjacent blocks
4011 void OopMapBlocksBuilder::compact() {
4012 if (_nonstatic_oop_map_count <= 1) {
4013 return;
4014 }
4015 /*
4016 * Since field layout sneaks in oops before values, we will be able to condense
4017 * blocks. There is potential to compact between super, own refs and values
4018 * containing refs.
4019 *
4020 * Currently compaction is slightly limited due to values being 8 byte aligned.
4021 * This may well change: FixMe if it doesn't, the code below is fairly general purpose
4022 * and maybe it doesn't need to be.
4023 */
4024 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
4025 (_sort_Fn)OopMapBlock::compare_offset);
4026 if (_nonstatic_oop_map_count < 2) {
4027 return;
4028 }
4029
4030 // Make a temp copy, and iterate through and copy back into the original
4031 ResourceMark rm;
4032 OopMapBlock* oop_maps_copy =
4033 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
4034 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
4035 copy(oop_maps_copy);
4036 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
4037 unsigned int new_count = 1;
4038 oop_maps_copy++;
4039 while(oop_maps_copy < oop_maps_copy_end) {
4040 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4041 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4042 nonstatic_oop_map->increment_count(oop_maps_copy->count());
4043 } else {
4044 nonstatic_oop_map++;
4045 new_count++;
4046 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4047 nonstatic_oop_map->set_count(oop_maps_copy->count());
4048 }
4049 oop_maps_copy++;
4050 }
4051 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
4052 _nonstatic_oop_map_count = new_count;
4053 }
4054
4055 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4056 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4057 if (_nonstatic_oop_map_count > 0) {
4058 OopMapBlock* map = _nonstatic_oop_maps;
4059 OopMapBlock* last_map = last_oop_map();
4060 assert(map <= last_map, "Last less than first");
4061 while (map <= last_map) {
4062 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4063 map->offset() + map->offset_span() - heapOopSize, map->count());
4064 map++;
4065 }
4066 }
4067 }
4068
4069 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4070 print_on(st);
4071 }
4072
4073 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4074 assert(ik != nullptr, "invariant");
4075
4076 const InstanceKlass* const super = ik->java_super();
4077
4078 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4079 // in which case we don't have to register objects as finalizable
4080 if (!_has_empty_finalizer) {
4081 if (_has_finalizer ||
4082 (super != nullptr && super->has_finalizer())) {
4083 ik->set_has_finalizer();
4084 }
4085 }
4086
4087 #ifdef ASSERT
4088 bool f = false;
4089 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4090 vmSymbols::void_method_signature());
4091 if (InstanceKlass::is_finalization_enabled() &&
4092 (m != nullptr) && !m->is_empty_method()) {
4093 f = true;
4094 }
4095
4096 // Spec doesn't prevent agent from redefinition of empty finalizer.
4097 // Despite the fact that it's generally bad idea and redefined finalizer
4098 // will not work as expected we shouldn't abort vm in this case
4099 if (!ik->has_redefined_this_or_super()) {
4100 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4101 }
4102 #endif
4103
4104 // Check if this klass supports the java.lang.Cloneable interface
4105 if (vmClasses::Cloneable_klass_loaded()) {
4106 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4107 ik->set_is_cloneable();
4108 }
4109 }
4110
4111 // Check if this klass has a vanilla default constructor
4112 if (super == nullptr) {
4113 // java.lang.Object has empty default constructor
4114 ik->set_has_vanilla_constructor();
4115 } else {
4116 if (super->has_vanilla_constructor() &&
4117 _has_vanilla_constructor) {
4118 ik->set_has_vanilla_constructor();
4119 }
4120 #ifdef ASSERT
4121 bool v = false;
4122 if (super->has_vanilla_constructor()) {
4123 const Method* const constructor =
4124 ik->find_method(vmSymbols::object_initializer_name(),
4125 vmSymbols::void_method_signature());
4126 if (constructor != nullptr && constructor->is_vanilla_constructor()) {
4127 v = true;
4128 }
4129 }
4130 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4131 #endif
4132 }
4133
4134 // If it cannot be fast-path allocated, set a bit in the layout helper.
4135 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4136 assert(ik->size_helper() > 0, "layout_helper is initialized");
4137 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4138 || ik->is_abstract() || ik->is_interface()
4139 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4140 || ik->size_helper() >= FastAllocateSizeLimit) {
4141 // Forbid fast-path allocation.
4142 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4143 ik->set_layout_helper(lh);
4144 }
4145 }
4146
4147 // utility methods for appending an array with check for duplicates
4148
4149 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4150 const Array<InstanceKlass*>* const ifs) {
4151 // iterate over new interfaces
4152 for (int i = 0; i < ifs->length(); i++) {
4153 InstanceKlass* const e = ifs->at(i);
4154 assert(e->is_klass() && e->is_interface(), "just checking");
4155 // add new interface
4156 result->append_if_missing(e);
4157 }
4158 }
4159
4160 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4161 Array<InstanceKlass*>* local_ifs,
4162 ClassLoaderData* loader_data,
4163 TRAPS) {
4164 assert(local_ifs != nullptr, "invariant");
4165 assert(loader_data != nullptr, "invariant");
4166
4167 // Compute maximum size for transitive interfaces
4168 int max_transitive_size = 0;
4169 int super_size = 0;
4170 // Add superclass transitive interfaces size
4171 if (super != nullptr) {
4172 super_size = super->transitive_interfaces()->length();
4173 max_transitive_size += super_size;
4174 }
4175 // Add local interfaces' super interfaces
4176 const int local_size = local_ifs->length();
4177 for (int i = 0; i < local_size; i++) {
4178 InstanceKlass* const l = local_ifs->at(i);
4179 max_transitive_size += l->transitive_interfaces()->length();
4180 }
4181 // Finally add local interfaces
4182 max_transitive_size += local_size;
4183 // Construct array
4184 if (max_transitive_size == 0) {
4185 // no interfaces, use canonicalized array
4186 return Universe::the_empty_instance_klass_array();
4187 } else if (max_transitive_size == super_size) {
4188 // no new local interfaces added, share superklass' transitive interface array
4189 return super->transitive_interfaces();
4190 } else if (max_transitive_size == local_size) {
4191 // only local interfaces added, share local interface array
4192 return local_ifs;
4193 } else {
4194 ResourceMark rm;
4195 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4196
4197 // Copy down from superclass
4198 if (super != nullptr) {
4199 append_interfaces(result, super->transitive_interfaces());
4200 }
4201
4202 // Copy down from local interfaces' superinterfaces
4203 for (int i = 0; i < local_size; i++) {
4204 InstanceKlass* const l = local_ifs->at(i);
4205 append_interfaces(result, l->transitive_interfaces());
4206 }
4207 // Finally add local interfaces
4208 append_interfaces(result, local_ifs);
4209
4210 // length will be less than the max_transitive_size if duplicates were removed
4211 const int length = result->length();
4212 assert(length <= max_transitive_size, "just checking");
4213 Array<InstanceKlass*>* const new_result =
4214 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4215 for (int i = 0; i < length; i++) {
4216 InstanceKlass* const e = result->at(i);
4217 assert(e != nullptr, "just checking");
4218 new_result->at_put(i, e);
4219 }
4220 return new_result;
4221 }
4222 }
4223
4224 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4225 assert(this_klass != nullptr, "invariant");
4226 const Klass* const super = this_klass->super();
4227
4228 if (super != nullptr) {
4229 const InstanceKlass* super_ik = InstanceKlass::cast(super);
4230
4231 if (super->is_final()) {
4232 classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD);
4233 return;
4234 }
4235
4236 if (super_ik->is_sealed() && !super_ik->has_as_permitted_subclass(this_klass)) {
4237 classfile_icce_error("class %s cannot inherit from sealed class %s", super_ik, THREAD);
4238 return;
4239 }
4240
4241 // If the loader is not the boot loader then throw an exception if its
4242 // superclass is in package jdk.internal.reflect and its loader is not a
4243 // special reflection class loader
4244 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4245 PackageEntry* super_package = super->package();
4246 if (super_package != nullptr &&
4247 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4248 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4249 ResourceMark rm(THREAD);
4250 Exceptions::fthrow(
4251 THREAD_AND_LOCATION,
4252 vmSymbols::java_lang_IllegalAccessError(),
4253 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4254 this_klass->external_name(),
4255 this_klass->class_loader_data()->loader_name_and_id(),
4256 super->external_name());
4257 return;
4258 }
4259 }
4260
4261 Reflection::VerifyClassAccessResults vca_result =
4262 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4263 if (vca_result != Reflection::ACCESS_OK) {
4264 ResourceMark rm(THREAD);
4265 char* msg = Reflection::verify_class_access_msg(this_klass,
4266 InstanceKlass::cast(super),
4267 vca_result);
4268 if (msg == nullptr) {
4269 bool same_module = (this_klass->module() == super->module());
4270 Exceptions::fthrow(
4271 THREAD_AND_LOCATION,
4272 vmSymbols::java_lang_IllegalAccessError(),
4273 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4274 this_klass->external_name(),
4275 super->is_abstract() ? "abstract " : "",
4276 super->external_name(),
4277 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4278 (same_module) ? "" : "; ",
4279 (same_module) ? "" : super->class_in_module_of_loader());
4280 } else {
4281 // Add additional message content.
4282 Exceptions::fthrow(
4283 THREAD_AND_LOCATION,
4284 vmSymbols::java_lang_IllegalAccessError(),
4285 "superclass access check failed: %s",
4286 msg);
4287 }
4288 }
4289 }
4290 }
4291
4292
4293 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4294 assert(this_klass != nullptr, "invariant");
4295 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4296 const int lng = local_interfaces->length();
4297 for (int i = lng - 1; i >= 0; i--) {
4298 InstanceKlass* const k = local_interfaces->at(i);
4299 assert (k != nullptr && k->is_interface(), "invalid interface");
4300
4301 if (k->is_sealed() && !k->has_as_permitted_subclass(this_klass)) {
4302 classfile_icce_error(this_klass->is_interface() ?
4303 "class %s cannot extend sealed interface %s" :
4304 "class %s cannot implement sealed interface %s",
4305 k, THREAD);
4306 return;
4307 }
4308
4309 Reflection::VerifyClassAccessResults vca_result =
4310 Reflection::verify_class_access(this_klass, k, false);
4311 if (vca_result != Reflection::ACCESS_OK) {
4312 ResourceMark rm(THREAD);
4313 char* msg = Reflection::verify_class_access_msg(this_klass,
4314 k,
4315 vca_result);
4316 if (msg == nullptr) {
4317 bool same_module = (this_klass->module() == k->module());
4318 Exceptions::fthrow(
4319 THREAD_AND_LOCATION,
4320 vmSymbols::java_lang_IllegalAccessError(),
4321 "class %s cannot access its superinterface %s (%s%s%s)",
4322 this_klass->external_name(),
4323 k->external_name(),
4324 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4325 (same_module) ? "" : "; ",
4326 (same_module) ? "" : k->class_in_module_of_loader());
4327 } else {
4328 // Add additional message content.
4329 Exceptions::fthrow(
4330 THREAD_AND_LOCATION,
4331 vmSymbols::java_lang_IllegalAccessError(),
4332 "superinterface check failed: %s",
4333 msg);
4334 }
4335 }
4336 }
4337 }
4338
4339
4340 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4341 assert(this_klass != nullptr, "invariant");
4342 const Array<Method*>* const methods = this_klass->methods();
4343 const int num_methods = methods->length();
4344
4345 // go thru each method and check if it overrides a final method
4346 for (int index = 0; index < num_methods; index++) {
4347 const Method* const m = methods->at(index);
4348
4349 // skip private, static, and <init> methods
4350 if ((!m->is_private() && !m->is_static()) &&
4351 (m->name() != vmSymbols::object_initializer_name())) {
4352
4353 const Symbol* const name = m->name();
4354 const Symbol* const signature = m->signature();
4355 const InstanceKlass* k = this_klass->java_super();
4356 const Method* super_m = nullptr;
4357 while (k != nullptr) {
4358 // skip supers that don't have final methods.
4359 if (k->has_final_method()) {
4360 // lookup a matching method in the super class hierarchy
4361 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4362 if (super_m == nullptr) {
4363 break; // didn't find any match; get out
4364 }
4365
4366 if (super_m->is_final() && !super_m->is_static() &&
4367 !super_m->access_flags().is_private()) {
4368 // matching method in super is final, and not static or private
4369 bool can_access = Reflection::verify_member_access(this_klass,
4370 super_m->method_holder(),
4371 super_m->method_holder(),
4372 super_m->access_flags(),
4373 false, false, CHECK);
4374 if (can_access) {
4375 // this class can access super final method and therefore override
4376 ResourceMark rm(THREAD);
4377 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
4378 err_msg("class %s overrides final method %s.%s%s",
4379 this_klass->external_name(),
4380 super_m->method_holder()->external_name(),
4381 name->as_C_string(),
4382 signature->as_C_string()));
4383 }
4384 }
4385
4386 // continue to look from super_m's holder's super.
4387 k = super_m->method_holder()->java_super();
4388 continue;
4389 }
4390
4391 k = k->java_super();
4392 }
4393 }
4394 }
4395 }
4396
4397
4398 // assumes that this_klass is an interface
4399 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4400 assert(this_klass != nullptr, "invariant");
4401 assert(this_klass->is_interface(), "not an interface");
4402 const Array<Method*>* methods = this_klass->methods();
4403 const int num_methods = methods->length();
4404
4405 for (int index = 0; index < num_methods; index++) {
4406 const Method* const m = methods->at(index);
4407 // if m is static and not the init method, throw a verify error
4408 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4409 ResourceMark rm(THREAD);
4410 Exceptions::fthrow(
4411 THREAD_AND_LOCATION,
4412 vmSymbols::java_lang_VerifyError(),
4413 "Illegal static method %s in interface %s",
4414 m->name()->as_C_string(),
4415 this_klass->external_name()
4416 );
4417 return;
4418 }
4419 }
4420 }
4421
4422 // utility methods for format checking
4423
4424 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4425 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4426 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4427 if (is_module) {
4428 ResourceMark rm(THREAD);
4429 Exceptions::fthrow(
4430 THREAD_AND_LOCATION,
4431 vmSymbols::java_lang_NoClassDefFoundError(),
4432 "%s is not a class because access_flag ACC_MODULE is set",
4433 _class_name->as_C_string());
4434 return;
4435 }
4436
4437 if (!_need_verify) { return; }
4438
4439 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4440 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4441 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4442 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4443 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4444 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4445 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4446
4447 if ((is_abstract && is_final) ||
4448 (is_interface && !is_abstract) ||
4449 (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
4450 (!is_interface && major_gte_1_5 && is_annotation)) {
4451 ResourceMark rm(THREAD);
4452 Exceptions::fthrow(
4453 THREAD_AND_LOCATION,
4454 vmSymbols::java_lang_ClassFormatError(),
4455 "Illegal class modifiers in class %s: 0x%X",
4456 _class_name->as_C_string(), flags
4457 );
4458 return;
4459 }
4460 }
4461
4462 static bool has_illegal_visibility(jint flags) {
4463 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4464 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4465 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4466
4467 return ((is_public && is_protected) ||
4468 (is_public && is_private) ||
4469 (is_protected && is_private));
4470 }
4471
4472 // A legal major_version.minor_version must be one of the following:
4473 //
4474 // Major_version >= 45 and major_version < 56, any minor_version.
4475 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4476 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4477 //
4478 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4479 ResourceMark rm(THREAD);
4480 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4481 if (major < JAVA_MIN_SUPPORTED_VERSION) {
4482 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
4483 class_name, major, minor, THREAD);
4484 return;
4485 }
4486
4487 if (major > max_version) {
4488 Exceptions::fthrow(
4489 THREAD_AND_LOCATION,
4490 vmSymbols::java_lang_UnsupportedClassVersionError(),
4491 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4492 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4493 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4494 return;
4495 }
4496
4497 if (major < JAVA_12_VERSION || minor == 0) {
4498 return;
4499 }
4500
4501 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4502 if (major != max_version) {
4503 Exceptions::fthrow(
4504 THREAD_AND_LOCATION,
4505 vmSymbols::java_lang_UnsupportedClassVersionError(),
4506 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4507 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4508 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4509 return;
4510 }
4511
4512 if (!Arguments::enable_preview()) {
4513 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4514 class_name, major, minor, THREAD);
4515 return;
4516 }
4517
4518 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4519 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4520 class_name, major, minor, THREAD);
4521 }
4522 }
4523
4524 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4525 bool is_interface,
4526 TRAPS) const {
4527 if (!_need_verify) { return; }
4528
4529 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4530 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4531 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4532 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4533 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4534 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4535 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4536 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4537 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4538
4539 bool is_illegal = false;
4540
4541 if (is_interface) {
4542 if (!is_public || !is_static || !is_final || is_private ||
4543 is_protected || is_volatile || is_transient ||
4544 (major_gte_1_5 && is_enum)) {
4545 is_illegal = true;
4546 }
4547 } else { // not interface
4548 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4549 is_illegal = true;
4550 }
4551 }
4552
4553 if (is_illegal) {
4554 ResourceMark rm(THREAD);
4555 Exceptions::fthrow(
4556 THREAD_AND_LOCATION,
4557 vmSymbols::java_lang_ClassFormatError(),
4558 "Illegal field modifiers in class %s: 0x%X",
4559 _class_name->as_C_string(), flags);
4560 return;
4561 }
4562 }
4563
4564 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4565 bool is_interface,
4566 const Symbol* name,
4567 TRAPS) const {
4568 if (!_need_verify) { return; }
4569
4570 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4571 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4572 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4573 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4574 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4575 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4576 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4577 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4578 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4579 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4580 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4581 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4582 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4583 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4584
4585 bool is_illegal = false;
4586
4587 if (is_interface) {
4588 if (major_gte_8) {
4589 // Class file version is JAVA_8_VERSION or later Methods of
4590 // interfaces may set any of the flags except ACC_PROTECTED,
4591 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4592 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4593 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4594 (is_native || is_protected || is_final || is_synchronized) ||
4595 // If a specific method of a class or interface has its
4596 // ACC_ABSTRACT flag set, it must not have any of its
4597 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4598 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4599 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4600 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4601 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4602 is_illegal = true;
4603 }
4604 } else if (major_gte_1_5) {
4605 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4606 if (!is_public || is_private || is_protected || is_static || is_final ||
4607 is_synchronized || is_native || !is_abstract || is_strict) {
4608 is_illegal = true;
4609 }
4610 } else {
4611 // Class file version is pre-JAVA_1_5_VERSION
4612 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4613 is_illegal = true;
4614 }
4615 }
4616 } else { // not interface
4617 if (has_illegal_visibility(flags)) {
4618 is_illegal = true;
4619 } else {
4620 if (is_initializer) {
4621 if (is_static || is_final || is_synchronized || is_native ||
4622 is_abstract || (major_gte_1_5 && is_bridge)) {
4623 is_illegal = true;
4624 }
4625 } else { // not initializer
4626 if (is_abstract) {
4627 if ((is_final || is_native || is_private || is_static ||
4628 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4629 is_illegal = true;
4630 }
4631 }
4632 }
4633 }
4634 }
4635
4636 if (is_illegal) {
4637 ResourceMark rm(THREAD);
4638 Exceptions::fthrow(
4639 THREAD_AND_LOCATION,
4640 vmSymbols::java_lang_ClassFormatError(),
4641 "Method %s in class %s has illegal modifiers: 0x%X",
4642 name->as_C_string(), _class_name->as_C_string(), flags);
4643 return;
4644 }
4645 }
4646
4647 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4648 int length,
4649 TRAPS) const {
4650 assert(_need_verify, "only called when _need_verify is true");
4651 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
4652 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4653 }
4654 }
4655
4656 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4657 // In class names, '/' separates unqualified names. This is verified in this function also.
4658 // Method names also may not contain the characters '<' or '>', unless <init>
4659 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4660 // method. Because these names have been checked as special cases before
4661 // calling this method in verify_legal_method_name.
4662 //
4663 // This method is also called from the modular system APIs in modules.cpp
4664 // to verify the validity of module and package names.
4665 bool ClassFileParser::verify_unqualified_name(const char* name,
4666 unsigned int length,
4667 int type) {
4668 if (length == 0) return false; // Must have at least one char.
4669 for (const char* p = name; p != name + length; p++) {
4670 switch(*p) {
4671 case JVM_SIGNATURE_DOT:
4672 case JVM_SIGNATURE_ENDCLASS:
4673 case JVM_SIGNATURE_ARRAY:
4674 // do not permit '.', ';', or '['
4675 return false;
4676 case JVM_SIGNATURE_SLASH:
4677 // check for '//' or leading or trailing '/' which are not legal
4678 // unqualified name must not be empty
4679 if (type == ClassFileParser::LegalClass) {
4680 if (p == name || p+1 >= name+length ||
4681 *(p+1) == JVM_SIGNATURE_SLASH) {
4682 return false;
4683 }
4684 } else {
4685 return false; // do not permit '/' unless it's class name
4686 }
4687 break;
4688 case JVM_SIGNATURE_SPECIAL:
4689 case JVM_SIGNATURE_ENDSPECIAL:
4690 // do not permit '<' or '>' in method names
4691 if (type == ClassFileParser::LegalMethod) {
4692 return false;
4693 }
4694 }
4695 }
4696 return true;
4697 }
4698
4699 // Take pointer to a UTF8 byte string (not NUL-terminated).
4700 // Skip over the longest part of the string that could
4701 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4702 // Return a pointer to just past the fieldname.
4703 // Return null if no fieldname at all was found, or in the case of slash_ok
4704 // being true, we saw consecutive slashes (meaning we were looking for a
4705 // qualified path but found something that was badly-formed).
4706 static const char* skip_over_field_name(const char* const name,
4707 bool slash_ok,
4708 unsigned int length) {
4709 const char* p;
4710 jboolean last_is_slash = false;
4711 jboolean not_first_ch = false;
4712
4713 for (p = name; p != name + length; not_first_ch = true) {
4714 const char* old_p = p;
4715 jchar ch = *p;
4716 if (ch < 128) {
4717 p++;
4718 // quick check for ascii
4719 if ((ch >= 'a' && ch <= 'z') ||
4720 (ch >= 'A' && ch <= 'Z') ||
4721 (ch == '_' || ch == '$') ||
4722 (not_first_ch && ch >= '0' && ch <= '9')) {
4723 last_is_slash = false;
4724 continue;
4725 }
4726 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
4727 if (last_is_slash) {
4728 return nullptr; // Don't permit consecutive slashes
4729 }
4730 last_is_slash = true;
4731 continue;
4732 }
4733 }
4734 else {
4735 jint unicode_ch;
4736 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4737 p = tmp_p;
4738 last_is_slash = false;
4739 // Check if ch is Java identifier start or is Java identifier part
4740 // 4672820: call java.lang.Character methods directly without generating separate tables.
4741 EXCEPTION_MARK;
4742 // return value
4743 JavaValue result(T_BOOLEAN);
4744 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
4745 JavaCallArguments args;
4746 args.push_int(unicode_ch);
4747
4748 if (not_first_ch) {
4749 // public static boolean isJavaIdentifierPart(char ch);
4750 JavaCalls::call_static(&result,
4751 vmClasses::Character_klass(),
4752 vmSymbols::isJavaIdentifierPart_name(),
4753 vmSymbols::int_bool_signature(),
4754 &args,
4755 THREAD);
4756 } else {
4757 // public static boolean isJavaIdentifierStart(char ch);
4758 JavaCalls::call_static(&result,
4759 vmClasses::Character_klass(),
4760 vmSymbols::isJavaIdentifierStart_name(),
4761 vmSymbols::int_bool_signature(),
4762 &args,
4763 THREAD);
4764 }
4765 if (HAS_PENDING_EXCEPTION) {
4766 CLEAR_PENDING_EXCEPTION;
4767 return nullptr;
4768 }
4769 if(result.get_jboolean()) {
4770 continue;
4771 }
4772 }
4773 return (not_first_ch) ? old_p : nullptr;
4774 }
4775 return (not_first_ch && !last_is_slash) ? p : nullptr;
4776 }
4777
4778 // Take pointer to a UTF8 byte string (not NUL-terminated).
4779 // Skip over the longest part of the string that could
4780 // be taken as a field signature. Allow "void" if void_ok.
4781 // Return a pointer to just past the signature.
4782 // Return null if no legal signature is found.
4783 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4784 bool void_ok,
4785 unsigned int length,
4786 TRAPS) const {
4787 unsigned int array_dim = 0;
4788 while (length > 0) {
4789 switch (signature[0]) {
4790 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4791 case JVM_SIGNATURE_BOOLEAN:
4792 case JVM_SIGNATURE_BYTE:
4793 case JVM_SIGNATURE_CHAR:
4794 case JVM_SIGNATURE_SHORT:
4795 case JVM_SIGNATURE_INT:
4796 case JVM_SIGNATURE_FLOAT:
4797 case JVM_SIGNATURE_LONG:
4798 case JVM_SIGNATURE_DOUBLE:
4799 return signature + 1;
4800 case JVM_SIGNATURE_CLASS: {
4801 if (_major_version < JAVA_1_5_VERSION) {
4802 // Skip over the class name if one is there
4803 const char* const p = skip_over_field_name(signature + 1, true, --length);
4804
4805 // The next character better be a semicolon
4806 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
4807 return p + 1;
4808 }
4809 }
4810 else {
4811 // Skip leading 'L' and ignore first appearance of ';'
4812 signature++;
4813 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4814 // Format check signature
4815 if (c != nullptr) {
4816 int newlen = pointer_delta_as_int(c, (char*) signature);
4817 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4818 if (!legal) {
4819 classfile_parse_error("Class name is empty or contains illegal character "
4820 "in descriptor in class file %s",
4821 THREAD);
4822 return nullptr;
4823 }
4824 return signature + newlen + 1;
4825 }
4826 }
4827 return nullptr;
4828 }
4829 case JVM_SIGNATURE_ARRAY:
4830 array_dim++;
4831 if (array_dim > 255) {
4832 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4833 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
4834 return nullptr;
4835 }
4836 // The rest of what's there better be a legal signature
4837 signature++;
4838 length--;
4839 void_ok = false;
4840 break;
4841 default:
4842 return nullptr;
4843 }
4844 }
4845 return nullptr;
4846 }
4847
4848 // Checks if name is a legal class name.
4849 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4850 if (!_need_verify || _relax_verify) { return; }
4851
4852 assert(name->refcount() > 0, "symbol must be kept alive");
4853 char* bytes = (char*)name->bytes();
4854 unsigned int length = name->utf8_length();
4855 bool legal = false;
4856
4857 if (length > 0) {
4858 const char* p;
4859 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4860 p = skip_over_field_signature(bytes, false, length, CHECK);
4861 legal = (p != nullptr) && ((p - bytes) == (int)length);
4862 } else if (_major_version < JAVA_1_5_VERSION) {
4863 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4864 p = skip_over_field_name(bytes, true, length);
4865 legal = (p != nullptr) && ((p - bytes) == (int)length);
4866 }
4867 } else {
4868 // 4900761: relax the constraints based on JSR202 spec
4869 // Class names may be drawn from the entire Unicode character set.
4870 // Identifiers between '/' must be unqualified names.
4871 // The utf8 string has been verified when parsing cpool entries.
4872 legal = verify_unqualified_name(bytes, length, LegalClass);
4873 }
4874 }
4875 if (!legal) {
4876 ResourceMark rm(THREAD);
4877 assert(_class_name != nullptr, "invariant");
4878 Exceptions::fthrow(
4879 THREAD_AND_LOCATION,
4880 vmSymbols::java_lang_ClassFormatError(),
4881 "Illegal class name \"%.*s\" in class file %s", length, bytes,
4882 _class_name->as_C_string()
4883 );
4884 return;
4885 }
4886 }
4887
4888 // Checks if name is a legal field name.
4889 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
4890 if (!_need_verify || _relax_verify) { return; }
4891
4892 char* bytes = (char*)name->bytes();
4893 unsigned int length = name->utf8_length();
4894 bool legal = false;
4895
4896 if (length > 0) {
4897 if (_major_version < JAVA_1_5_VERSION) {
4898 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4899 const char* p = skip_over_field_name(bytes, false, length);
4900 legal = (p != nullptr) && ((p - bytes) == (int)length);
4901 }
4902 } else {
4903 // 4881221: relax the constraints based on JSR202 spec
4904 legal = verify_unqualified_name(bytes, length, LegalField);
4905 }
4906 }
4907
4908 if (!legal) {
4909 ResourceMark rm(THREAD);
4910 assert(_class_name != nullptr, "invariant");
4911 Exceptions::fthrow(
4912 THREAD_AND_LOCATION,
4913 vmSymbols::java_lang_ClassFormatError(),
4914 "Illegal field name \"%.*s\" in class %s", length, bytes,
4915 _class_name->as_C_string()
4916 );
4917 return;
4918 }
4919 }
4920
4921 // Checks if name is a legal method name.
4922 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
4923 if (!_need_verify || _relax_verify) { return; }
4924
4925 assert(name != nullptr, "method name is null");
4926 char* bytes = (char*)name->bytes();
4927 unsigned int length = name->utf8_length();
4928 bool legal = false;
4929
4930 if (length > 0) {
4931 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
4932 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4933 legal = true;
4934 }
4935 } else if (_major_version < JAVA_1_5_VERSION) {
4936 const char* p;
4937 p = skip_over_field_name(bytes, false, length);
4938 legal = (p != nullptr) && ((p - bytes) == (int)length);
4939 } else {
4940 // 4881221: relax the constraints based on JSR202 spec
4941 legal = verify_unqualified_name(bytes, length, LegalMethod);
4942 }
4943 }
4944
4945 if (!legal) {
4946 ResourceMark rm(THREAD);
4947 assert(_class_name != nullptr, "invariant");
4948 Exceptions::fthrow(
4949 THREAD_AND_LOCATION,
4950 vmSymbols::java_lang_ClassFormatError(),
4951 "Illegal method name \"%.*s\" in class %s", length, bytes,
4952 _class_name->as_C_string()
4953 );
4954 return;
4955 }
4956 }
4957
4958
4959 // Checks if signature is a legal field signature.
4960 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
4961 const Symbol* signature,
4962 TRAPS) const {
4963 if (!_need_verify) { return; }
4964
4965 const char* const bytes = (const char*)signature->bytes();
4966 const unsigned int length = signature->utf8_length();
4967 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
4968
4969 if (p == nullptr || (p - bytes) != (int)length) {
4970 throwIllegalSignature("Field", name, signature, CHECK);
4971 }
4972 }
4973
4974 // Check that the signature is compatible with the method name. For example,
4975 // check that <init> has a void signature.
4976 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
4977 const Symbol* signature,
4978 TRAPS) const {
4979 if (!_need_verify) {
4980 return;
4981 }
4982
4983 // Class initializers cannot have args for class format version >= 51.
4984 if (name == vmSymbols::class_initializer_name() &&
4985 signature != vmSymbols::void_method_signature() &&
4986 _major_version >= JAVA_7_VERSION) {
4987 throwIllegalSignature("Method", name, signature, THREAD);
4988 return;
4989 }
4990
4991 int sig_length = signature->utf8_length();
4992 if (name->utf8_length() > 0 &&
4993 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
4994 sig_length > 0 &&
4995 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
4996 throwIllegalSignature("Method", name, signature, THREAD);
4997 }
4998 }
4999
5000 // Checks if signature is a legal method signature.
5001 // Returns number of parameters
5002 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5003 const Symbol* signature,
5004 TRAPS) const {
5005 if (!_need_verify) {
5006 // make sure caller's args_size will be less than 0 even for non-static
5007 // method so it will be recomputed in compute_size_of_parameters().
5008 return -2;
5009 }
5010
5011 unsigned int args_size = 0;
5012 const char* p = (const char*)signature->bytes();
5013 unsigned int length = signature->utf8_length();
5014 const char* nextp;
5015
5016 // The first character must be a '('
5017 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5018 length--;
5019 // Skip over legal field signatures
5020 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5021 while ((length > 0) && (nextp != nullptr)) {
5022 args_size++;
5023 if (p[0] == 'J' || p[0] == 'D') {
5024 args_size++;
5025 }
5026 length -= pointer_delta_as_int(nextp, p);
5027 p = nextp;
5028 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5029 }
5030 // The first non-signature thing better be a ')'
5031 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5032 length--;
5033 // Now we better just have a return value
5034 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5035 if (nextp && ((int)length == (nextp - p))) {
5036 return args_size;
5037 }
5038 }
5039 }
5040 // Report error
5041 throwIllegalSignature("Method", name, signature, THREAD);
5042 return 0;
5043 }
5044
5045 int ClassFileParser::static_field_size() const {
5046 assert(_field_info != nullptr, "invariant");
5047 return _field_info->_static_field_size;
5048 }
5049
5050 int ClassFileParser::total_oop_map_count() const {
5051 assert(_field_info != nullptr, "invariant");
5052 return _field_info->oop_map_blocks->_nonstatic_oop_map_count;
5053 }
5054
5055 jint ClassFileParser::layout_size() const {
5056 assert(_field_info != nullptr, "invariant");
5057 return _field_info->_instance_size;
5058 }
5059
5060 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5061 const Array<Method*>* methods) {
5062 assert(ik != nullptr, "invariant");
5063 assert(methods != nullptr, "invariant");
5064
5065 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5066 // (We used to do this lazily, but now we query it in Rewriter,
5067 // which is eagerly done for every method, so we might as well do it now,
5068 // when everything is fresh in memory.)
5069 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5070
5071 if (klass_id != vmSymbolID::NO_SID) {
5072 for (int j = 0; j < methods->length(); ++j) {
5073 Method* method = methods->at(j);
5074 method->init_intrinsic_id(klass_id);
5075
5076 if (CheckIntrinsics) {
5077 // Check if an intrinsic is defined for method 'method',
5078 // but the method is not annotated with @IntrinsicCandidate.
5079 if (method->intrinsic_id() != vmIntrinsics::_none &&
5080 !method->intrinsic_candidate()) {
5081 tty->print("Compiler intrinsic is defined for method [%s], "
5082 "but the method is not annotated with @IntrinsicCandidate.%s",
5083 method->name_and_sig_as_C_string(),
5084 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5085 );
5086 tty->cr();
5087 DEBUG_ONLY(vm_exit(1));
5088 }
5089 // Check is the method 'method' is annotated with @IntrinsicCandidate,
5090 // but there is no intrinsic available for it.
5091 if (method->intrinsic_candidate() &&
5092 method->intrinsic_id() == vmIntrinsics::_none) {
5093 tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
5094 "but no compiler intrinsic is defined for the method.%s",
5095 method->name_and_sig_as_C_string(),
5096 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5097 );
5098 tty->cr();
5099 DEBUG_ONLY(vm_exit(1));
5100 }
5101 }
5102 } // end for
5103
5104 #ifdef ASSERT
5105 if (CheckIntrinsics) {
5106 // Check for orphan methods in the current class. A method m
5107 // of a class C is orphan if an intrinsic is defined for method m,
5108 // but class C does not declare m.
5109 // The check is potentially expensive, therefore it is available
5110 // only in debug builds.
5111
5112 for (auto id : EnumRange<vmIntrinsicID>{}) {
5113 if (vmIntrinsics::_compiledLambdaForm == id) {
5114 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5115 // generated for the JVM from a LambdaForm and therefore no method
5116 // is defined for it.
5117 continue;
5118 }
5119 if (vmIntrinsics::_blackhole == id) {
5120 // The _blackhole intrinsic is a special marker. No explicit method
5121 // is defined for it.
5122 continue;
5123 }
5124
5125 if (vmIntrinsics::class_for(id) == klass_id) {
5126 // Check if the current class contains a method with the same
5127 // name, flags, signature.
5128 bool match = false;
5129 for (int j = 0; j < methods->length(); ++j) {
5130 const Method* method = methods->at(j);
5131 if (method->intrinsic_id() == id) {
5132 match = true;
5133 break;
5134 }
5135 }
5136
5137 if (!match) {
5138 char buf[1000];
5139 tty->print("Compiler intrinsic is defined for method [%s], "
5140 "but the method is not available in class [%s].%s",
5141 vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
5142 ik->name()->as_C_string(),
5143 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5144 );
5145 tty->cr();
5146 DEBUG_ONLY(vm_exit(1));
5147 }
5148 }
5149 } // end for
5150 } // CheckIntrinsics
5151 #endif // ASSERT
5152 }
5153 }
5154
5155 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5156 const ClassInstanceInfo& cl_inst_info,
5157 TRAPS) {
5158 if (_klass != nullptr) {
5159 return _klass;
5160 }
5161
5162 InstanceKlass* const ik =
5163 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5164
5165 if (is_hidden()) {
5166 mangle_hidden_class_name(ik);
5167 }
5168
5169 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5170
5171 assert(_klass == ik, "invariant");
5172
5173 return ik;
5174 }
5175
5176 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5177 bool changed_by_loadhook,
5178 const ClassInstanceInfo& cl_inst_info,
5179 TRAPS) {
5180 assert(ik != nullptr, "invariant");
5181
5182 // Set name and CLD before adding to CLD
5183 ik->set_class_loader_data(_loader_data);
5184 ik->set_name(_class_name);
5185
5186 // Add all classes to our internal class loader list here,
5187 // including classes in the bootstrap (null) class loader.
5188 const bool publicize = !is_internal();
5189
5190 _loader_data->add_class(ik, publicize);
5191
5192 set_klass_to_deallocate(ik);
5193
5194 assert(_field_info != nullptr, "invariant");
5195 assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5196 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5197 "sanity");
5198
5199 assert(ik->is_instance_klass(), "sanity");
5200 assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5201
5202 // Fill in information already parsed
5203 ik->set_should_verify_class(_need_verify);
5204
5205 // Not yet: supers are done below to support the new subtype-checking fields
5206 ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5207 ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5208 assert(_fac != nullptr, "invariant");
5209 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5210 ik->set_nonstatic_oop_field_count(_fac->count[NONSTATIC_OOP]);
5211
5212 // this transfers ownership of a lot of arrays from
5213 // the parser onto the InstanceKlass*
5214 apply_parsed_class_metadata(ik, _java_fields_count);
5215
5216 // can only set dynamic nest-host after static nest information is set
5217 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5218 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5219 }
5220
5221 // note that is not safe to use the fields in the parser from this point on
5222 assert(nullptr == _cp, "invariant");
5223 assert(nullptr == _fieldinfo_stream, "invariant");
5224 assert(nullptr == _fields_status, "invariant");
5225 assert(nullptr == _methods, "invariant");
5226 assert(nullptr == _inner_classes, "invariant");
5227 assert(nullptr == _nest_members, "invariant");
5228 assert(nullptr == _combined_annotations, "invariant");
5229 assert(nullptr == _record_components, "invariant");
5230 assert(nullptr == _permitted_subclasses, "invariant");
5231
5232 if (_has_localvariable_table) {
5233 ik->set_has_localvariable_table(true);
5234 }
5235
5236 if (_has_final_method) {
5237 ik->set_has_final_method();
5238 }
5239
5240 ik->copy_method_ordering(_method_ordering, CHECK);
5241 // The InstanceKlass::_methods_jmethod_ids cache
5242 // is managed on the assumption that the initial cache
5243 // size is equal to the number of methods in the class. If
5244 // that changes, then InstanceKlass::idnum_can_increment()
5245 // has to be changed accordingly.
5246 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5247
5248 ik->set_this_class_index(_this_class_index);
5249
5250 if (_is_hidden) {
5251 // _this_class_index is a CONSTANT_Class entry that refers to this
5252 // hidden class itself. If this class needs to refer to its own methods
5253 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5254 // _this_class_index. However, because this class is hidden (it's
5255 // not stored in SystemDictionary), _this_class_index cannot be resolved
5256 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5257 // Therefore, we must eagerly resolve _this_class_index now.
5258 ik->constants()->klass_at_put(_this_class_index, ik);
5259 }
5260
5261 ik->set_minor_version(_minor_version);
5262 ik->set_major_version(_major_version);
5263 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5264 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5265
5266 if (_is_hidden) {
5267 ik->set_is_hidden();
5268 }
5269
5270 // Set PackageEntry for this_klass
5271 oop cl = ik->class_loader();
5272 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5273 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5274 ik->set_package(cld, nullptr, CHECK);
5275
5276 const Array<Method*>* const methods = ik->methods();
5277 assert(methods != nullptr, "invariant");
5278 const int methods_len = methods->length();
5279
5280 check_methods_for_intrinsics(ik, methods);
5281
5282 // Fill in field values obtained by parse_classfile_attributes
5283 if (_parsed_annotations->has_any_annotations()) {
5284 _parsed_annotations->apply_to(ik);
5285 }
5286
5287 apply_parsed_class_attributes(ik);
5288
5289 // Miranda methods
5290 if ((_num_miranda_methods > 0) ||
5291 // if this class introduced new miranda methods or
5292 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5293 // super class exists and this class inherited miranda methods
5294 ) {
5295 ik->set_has_miranda_methods(); // then set a flag
5296 }
5297
5298 // Fill in information needed to compute superclasses.
5299 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5300 ik->set_transitive_interfaces(_transitive_interfaces);
5301 ik->set_local_interfaces(_local_interfaces);
5302 _transitive_interfaces = nullptr;
5303 _local_interfaces = nullptr;
5304
5305 // Initialize itable offset tables
5306 klassItable::setup_itable_offset_table(ik);
5307
5308 // Compute transitive closure of interfaces this class implements
5309 // Do final class setup
5310 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5311 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5312 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5313 }
5314
5315 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5316 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5317 ik->set_has_contended_annotations(true);
5318 }
5319
5320 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5321 set_precomputed_flags(ik);
5322
5323 // check if this class can access its super class
5324 check_super_class_access(ik, CHECK);
5325
5326 // check if this class can access its superinterfaces
5327 check_super_interface_access(ik, CHECK);
5328
5329 // check if this class overrides any final method
5330 check_final_method_override(ik, CHECK);
5331
5332 // reject static interface methods prior to Java 8
5333 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5334 check_illegal_static_method(ik, CHECK);
5335 }
5336
5337 // Obtain this_klass' module entry
5338 ModuleEntry* module_entry = ik->module();
5339 assert(module_entry != nullptr, "module_entry should always be set");
5340
5341 // Obtain java.lang.Module
5342 Handle module_handle(THREAD, module_entry->module());
5343
5344 // Allocate mirror and initialize static fields
5345 // The create_mirror() call will also call compute_modifiers()
5346 java_lang_Class::create_mirror(ik,
5347 Handle(THREAD, _loader_data->class_loader()),
5348 module_handle,
5349 _protection_domain,
5350 cl_inst_info.class_data(),
5351 CHECK);
5352
5353 assert(_all_mirandas != nullptr, "invariant");
5354
5355 // Generate any default methods - default methods are public interface methods
5356 // that have a default implementation. This is new with Java 8.
5357 if (_has_nonstatic_concrete_methods) {
5358 DefaultMethods::generate_default_methods(ik,
5359 _all_mirandas,
5360 CHECK);
5361 }
5362
5363 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5364 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5365 !module_entry->has_default_read_edges()) {
5366 if (!module_entry->set_has_default_read_edges()) {
5367 // We won a potential race
5368 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5369 }
5370 }
5371
5372 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5373
5374 if (!is_internal()) {
5375 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5376
5377 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5378 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5379 log_is_enabled(Info, class, preview)) {
5380 ResourceMark rm;
5381 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5382 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5383 }
5384
5385 if (log_is_enabled(Debug, class, resolve)) {
5386 ResourceMark rm;
5387 // print out the superclass.
5388 const char * from = ik->external_name();
5389 if (ik->java_super() != nullptr) {
5390 log_debug(class, resolve)("%s %s (super)",
5391 from,
5392 ik->java_super()->external_name());
5393 }
5394 // print out each of the interface classes referred to by this class.
5395 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5396 if (local_interfaces != nullptr) {
5397 const int length = local_interfaces->length();
5398 for (int i = 0; i < length; i++) {
5399 const InstanceKlass* const k = local_interfaces->at(i);
5400 const char * to = k->external_name();
5401 log_debug(class, resolve)("%s %s (interface)", from, to);
5402 }
5403 }
5404 }
5405 }
5406
5407 JFR_ONLY(INIT_ID(ik);)
5408
5409 // If we reach here, all is well.
5410 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5411 // in order for it to not be destroyed in the ClassFileParser destructor.
5412 set_klass_to_deallocate(nullptr);
5413
5414 // it's official
5415 set_klass(ik);
5416
5417 debug_only(ik->verify();)
5418 }
5419
5420 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5421 // Decrement the refcount in the old name, since we're clobbering it.
5422 _class_name->decrement_refcount();
5423
5424 _class_name = new_class_name;
5425 // Increment the refcount of the new name.
5426 // Now the ClassFileParser owns this name and will decrement in
5427 // the destructor.
5428 _class_name->increment_refcount();
5429 }
5430
5431 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5432 bool trusted = loader_data->is_boot_class_loader_data() ||
5433 loader_data->is_platform_class_loader_data();
5434 bool need_verify =
5435 // verifyAll
5436 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5437 // verifyRemote
5438 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5439 return !need_verify;
5440 }
5441
5442 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5443 Symbol* name,
5444 ClassLoaderData* loader_data,
5445 const ClassLoadInfo* cl_info,
5446 Publicity pub_level,
5447 TRAPS) :
5448 _stream(stream),
5449 _class_name(nullptr),
5450 _loader_data(loader_data),
5451 _is_hidden(cl_info->is_hidden()),
5452 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5453 _orig_cp_size(0),
5454 _super_klass(),
5455 _cp(nullptr),
5456 _fieldinfo_stream(nullptr),
5457 _fields_status(nullptr),
5458 _methods(nullptr),
5459 _inner_classes(nullptr),
5460 _nest_members(nullptr),
5461 _nest_host(0),
5462 _permitted_subclasses(nullptr),
5463 _record_components(nullptr),
5464 _local_interfaces(nullptr),
5465 _transitive_interfaces(nullptr),
5466 _combined_annotations(nullptr),
5467 _class_annotations(nullptr),
5468 _class_type_annotations(nullptr),
5469 _fields_annotations(nullptr),
5470 _fields_type_annotations(nullptr),
5471 _klass(nullptr),
5472 _klass_to_deallocate(nullptr),
5473 _parsed_annotations(nullptr),
5474 _fac(nullptr),
5475 _field_info(nullptr),
5476 _temp_field_info(nullptr),
5477 _method_ordering(nullptr),
5478 _all_mirandas(nullptr),
5479 _vtable_size(0),
5480 _itable_size(0),
5481 _num_miranda_methods(0),
5482 _protection_domain(cl_info->protection_domain()),
5483 _access_flags(),
5484 _pub_level(pub_level),
5485 _bad_constant_seen(0),
5486 _synthetic_flag(false),
5487 _sde_length(false),
5488 _sde_buffer(nullptr),
5489 _sourcefile_index(0),
5490 _generic_signature_index(0),
5491 _major_version(0),
5492 _minor_version(0),
5493 _this_class_index(0),
5494 _super_class_index(0),
5495 _itfs_len(0),
5496 _java_fields_count(0),
5497 _need_verify(false),
5498 _relax_verify(false),
5499 _has_nonstatic_concrete_methods(false),
5500 _declares_nonstatic_concrete_methods(false),
5501 _has_localvariable_table(false),
5502 _has_final_method(false),
5503 _has_contended_fields(false),
5504 _has_finalizer(false),
5505 _has_empty_finalizer(false),
5506 _has_vanilla_constructor(false),
5507 _max_bootstrap_specifier_index(-1) {
5508
5509 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5510 _class_name->increment_refcount();
5511
5512 assert(_loader_data != nullptr, "invariant");
5513 assert(stream != nullptr, "invariant");
5514 assert(_stream != nullptr, "invariant");
5515 assert(_stream->buffer() == _stream->current(), "invariant");
5516 assert(_class_name != nullptr, "invariant");
5517 assert(0 == _access_flags.as_int(), "invariant");
5518
5519 // Figure out whether we can skip format checking (matching classic VM behavior)
5520 if (DumpSharedSpaces) {
5521 // verify == true means it's a 'remote' class (i.e., non-boot class)
5522 // Verification decision is based on BytecodeVerificationRemote flag
5523 // for those classes.
5524 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
5525 BytecodeVerificationLocal;
5526 }
5527 else {
5528 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
5529 stream->need_verify());
5530 }
5531
5532 // synch back verification state to stream
5533 stream->set_verify(_need_verify);
5534
5535 // Check if verification needs to be relaxed for this class file
5536 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
5537 _relax_verify = relax_format_check_for(_loader_data);
5538
5539 parse_stream(stream, CHECK);
5540
5541 post_process_parsed_stream(stream, _cp, CHECK);
5542 }
5543
5544 void ClassFileParser::clear_class_metadata() {
5545 // metadata created before the instance klass is created. Must be
5546 // deallocated if classfile parsing returns an error.
5547 _cp = nullptr;
5548 _fieldinfo_stream = nullptr;
5549 _fields_status = nullptr;
5550 _methods = nullptr;
5551 _inner_classes = nullptr;
5552 _nest_members = nullptr;
5553 _permitted_subclasses = nullptr;
5554 _combined_annotations = nullptr;
5555 _class_annotations = _class_type_annotations = nullptr;
5556 _fields_annotations = _fields_type_annotations = nullptr;
5557 _record_components = nullptr;
5558 }
5559
5560 // Destructor to clean up
5561 ClassFileParser::~ClassFileParser() {
5562 _class_name->decrement_refcount();
5563
5564 if (_cp != nullptr) {
5565 MetadataFactory::free_metadata(_loader_data, _cp);
5566 }
5567
5568 if (_fieldinfo_stream != nullptr) {
5569 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5570 }
5571
5572 if (_fields_status != nullptr) {
5573 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5574 }
5575
5576 if (_methods != nullptr) {
5577 // Free methods
5578 InstanceKlass::deallocate_methods(_loader_data, _methods);
5579 }
5580
5581 // beware of the Universe::empty_blah_array!!
5582 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5583 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5584 }
5585
5586 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5587 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5588 }
5589
5590 if (_record_components != nullptr) {
5591 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5592 }
5593
5594 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5595 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5596 }
5597
5598 // Free interfaces
5599 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5600 _local_interfaces, _transitive_interfaces);
5601
5602 if (_combined_annotations != nullptr) {
5603 // After all annotations arrays have been created, they are installed into the
5604 // Annotations object that will be assigned to the InstanceKlass being created.
5605
5606 // Deallocate the Annotations object and the installed annotations arrays.
5607 _combined_annotations->deallocate_contents(_loader_data);
5608
5609 // If the _combined_annotations pointer is non-null,
5610 // then the other annotations fields should have been cleared.
5611 assert(_class_annotations == nullptr, "Should have been cleared");
5612 assert(_class_type_annotations == nullptr, "Should have been cleared");
5613 assert(_fields_annotations == nullptr, "Should have been cleared");
5614 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5615 } else {
5616 // If the annotations arrays were not installed into the Annotations object,
5617 // then they have to be deallocated explicitly.
5618 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
5619 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
5620 Annotations::free_contents(_loader_data, _fields_annotations);
5621 Annotations::free_contents(_loader_data, _fields_type_annotations);
5622 }
5623
5624 clear_class_metadata();
5625 _transitive_interfaces = nullptr;
5626 _local_interfaces = nullptr;
5627
5628 // deallocate the klass if already created. Don't directly deallocate, but add
5629 // to the deallocate list so that the klass is removed from the CLD::_klasses list
5630 // at a safepoint.
5631 if (_klass_to_deallocate != nullptr) {
5632 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5633 }
5634 }
5635
5636 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5637 TRAPS) {
5638
5639 assert(stream != nullptr, "invariant");
5640 assert(_class_name != nullptr, "invariant");
5641
5642 // BEGIN STREAM PARSING
5643 stream->guarantee_more(8, CHECK); // magic, major, minor
5644 // Magic value
5645 const u4 magic = stream->get_u4_fast();
5646 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5647 "Incompatible magic value %u in class file %s",
5648 magic, CHECK);
5649
5650 // Version numbers
5651 _minor_version = stream->get_u2_fast();
5652 _major_version = stream->get_u2_fast();
5653
5654 // Check version numbers - we check this even with verifier off
5655 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
5656
5657 stream->guarantee_more(3, CHECK); // length, first cp tag
5658 u2 cp_size = stream->get_u2_fast();
5659
5660 guarantee_property(
5661 cp_size >= 1, "Illegal constant pool size %u in class file %s",
5662 cp_size, CHECK);
5663
5664 _orig_cp_size = cp_size;
5665 if (is_hidden()) { // Add a slot for hidden class name.
5666 cp_size++;
5667 }
5668
5669 _cp = ConstantPool::allocate(_loader_data,
5670 cp_size,
5671 CHECK);
5672
5673 ConstantPool* const cp = _cp;
5674
5675 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5676
5677 assert(cp_size == (u2)cp->length(), "invariant");
5678
5679 // ACCESS FLAGS
5680 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5681
5682 // Access flags
5683 jint flags;
5684 // JVM_ACC_MODULE is defined in JDK-9 and later.
5685 if (_major_version >= JAVA_9_VERSION) {
5686 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5687 } else {
5688 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5689 }
5690
5691 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5692 // Set abstract bit for old class files for backward compatibility
5693 flags |= JVM_ACC_ABSTRACT;
5694 }
5695
5696 verify_legal_class_modifiers(flags, CHECK);
5697
5698 short bad_constant = class_bad_constant_seen();
5699 if (bad_constant != 0) {
5700 // Do not throw CFE until after the access_flags are checked because if
5701 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5702 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5703 return;
5704 }
5705
5706 _access_flags.set_flags(flags);
5707
5708 // This class and superclass
5709 _this_class_index = stream->get_u2_fast();
5710 check_property(
5711 valid_cp_range(_this_class_index, cp_size) &&
5712 cp->tag_at(_this_class_index).is_unresolved_klass(),
5713 "Invalid this class index %u in constant pool in class file %s",
5714 _this_class_index, CHECK);
5715
5716 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5717 assert(class_name_in_cp != nullptr, "class_name can't be null");
5718
5719 // Don't need to check whether this class name is legal or not.
5720 // It has been checked when constant pool is parsed.
5721 // However, make sure it is not an array type.
5722 if (_need_verify) {
5723 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
5724 "Bad class name in class file %s",
5725 CHECK);
5726 }
5727
5728 #ifdef ASSERT
5729 // Basic sanity checks
5730 if (_is_hidden) {
5731 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
5732 }
5733 #endif
5734
5735 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
5736
5737 if (_is_hidden) {
5738 assert(_class_name != nullptr, "Unexpected null _class_name");
5739 #ifdef ASSERT
5740 if (_need_verify) {
5741 verify_legal_class_name(_class_name, CHECK);
5742 }
5743 #endif
5744
5745 } else {
5746 // Check if name in class file matches given name
5747 if (_class_name != class_name_in_cp) {
5748 if (_class_name != vmSymbols::unknown_class_name()) {
5749 ResourceMark rm(THREAD);
5750 Exceptions::fthrow(THREAD_AND_LOCATION,
5751 vmSymbols::java_lang_NoClassDefFoundError(),
5752 "%s (wrong name: %s)",
5753 _class_name->as_C_string(),
5754 class_name_in_cp->as_C_string()
5755 );
5756 return;
5757 } else {
5758 // The class name was not known by the caller so we set it from
5759 // the value in the CP.
5760 update_class_name(class_name_in_cp);
5761 }
5762 // else nothing to do: the expected class name matches what is in the CP
5763 }
5764 }
5765
5766 // Verification prevents us from creating names with dots in them, this
5767 // asserts that that's the case.
5768 assert(is_internal_format(_class_name), "external class name format used internally");
5769
5770 if (!is_internal()) {
5771 LogTarget(Debug, class, preorder) lt;
5772 if (lt.is_enabled()){
5773 ResourceMark rm(THREAD);
5774 LogStream ls(lt);
5775 ls.print("%s", _class_name->as_klass_external_name());
5776 if (stream->source() != nullptr) {
5777 ls.print(" source: %s", stream->source());
5778 }
5779 ls.cr();
5780 }
5781 }
5782
5783 // SUPERKLASS
5784 _super_class_index = stream->get_u2_fast();
5785 _super_klass = parse_super_class(cp,
5786 _super_class_index,
5787 _need_verify,
5788 CHECK);
5789
5790 // Interfaces
5791 _itfs_len = stream->get_u2_fast();
5792 parse_interfaces(stream,
5793 _itfs_len,
5794 cp,
5795 &_has_nonstatic_concrete_methods,
5796 CHECK);
5797
5798 assert(_local_interfaces != nullptr, "invariant");
5799
5800 // Fields (offsets are filled in later)
5801 _fac = new FieldAllocationCount();
5802 parse_fields(stream,
5803 _access_flags.is_interface(),
5804 _fac,
5805 cp,
5806 cp_size,
5807 &_java_fields_count,
5808 CHECK);
5809
5810 assert(_temp_field_info != nullptr, "invariant");
5811
5812 // Methods
5813 parse_methods(stream,
5814 _access_flags.is_interface(),
5815 &_has_localvariable_table,
5816 &_has_final_method,
5817 &_declares_nonstatic_concrete_methods,
5818 CHECK);
5819
5820 assert(_methods != nullptr, "invariant");
5821
5822 if (_declares_nonstatic_concrete_methods) {
5823 _has_nonstatic_concrete_methods = true;
5824 }
5825
5826 // Additional attributes/annotations
5827 _parsed_annotations = new ClassAnnotationCollector();
5828 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
5829
5830 assert(_inner_classes != nullptr, "invariant");
5831
5832 // Finalize the Annotations metadata object,
5833 // now that all annotation arrays have been created.
5834 create_combined_annotations(CHECK);
5835
5836 // Make sure this is the end of class file stream
5837 guarantee_property(stream->at_eos(),
5838 "Extra bytes at the end of class file %s",
5839 CHECK);
5840
5841 // all bytes in stream read and parsed
5842 }
5843
5844 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
5845 ResourceMark rm;
5846 // Construct hidden name from _class_name, "+", and &ik. Note that we can't
5847 // use a '/' because that confuses finding the class's package. Also, can't
5848 // use an illegal char such as ';' because that causes serialization issues
5849 // and issues with hidden classes that create their own hidden classes.
5850 char addr_buf[20];
5851 if (DumpSharedSpaces) {
5852 // We want stable names for the archived hidden classes (only for static
5853 // archive for now). Spaces under default_SharedBaseAddress() will be
5854 // occupied by the archive at run time, so we know that no dynamically
5855 // loaded InstanceKlass will be placed under there.
5856 static volatile size_t counter = 0;
5857 Atomic::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
5858 size_t new_id = Atomic::add(&counter, (size_t)1);
5859 jio_snprintf(addr_buf, 20, SIZE_FORMAT_X, new_id);
5860 } else {
5861 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
5862 }
5863 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
5864 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
5865 jio_snprintf(new_name, new_name_len, "%s+%s",
5866 _class_name->as_C_string(), addr_buf);
5867 update_class_name(SymbolTable::new_symbol(new_name));
5868
5869 // Add a Utf8 entry containing the hidden name.
5870 assert(_class_name != nullptr, "Unexpected null _class_name");
5871 int hidden_index = _orig_cp_size; // this is an extra slot we added
5872 _cp->symbol_at_put(hidden_index, _class_name);
5873
5874 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
5875 // We have to update the resolved_klass_index and the name_index together
5876 // so extract the existing resolved_klass_index first.
5877 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
5878 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
5879 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
5880 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
5881 "Bad name_index");
5882 }
5883
5884 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
5885 ConstantPool* cp,
5886 TRAPS) {
5887 assert(stream != nullptr, "invariant");
5888 assert(stream->at_eos(), "invariant");
5889 assert(cp != nullptr, "invariant");
5890 assert(_loader_data != nullptr, "invariant");
5891
5892 if (_class_name == vmSymbols::java_lang_Object()) {
5893 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
5894 "java.lang.Object cannot implement an interface in class file %s",
5895 CHECK);
5896 }
5897 // We check super class after class file is parsed and format is checked
5898 if (_super_class_index > 0 && nullptr == _super_klass) {
5899 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
5900 if (_access_flags.is_interface()) {
5901 // Before attempting to resolve the superclass, check for class format
5902 // errors not checked yet.
5903 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
5904 "Interfaces must have java.lang.Object as superclass in class file %s",
5905 CHECK);
5906 }
5907 Handle loader(THREAD, _loader_data->class_loader());
5908 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
5909 _super_klass = vmClasses::Object_klass();
5910 } else {
5911 _super_klass = (const InstanceKlass*)
5912 SystemDictionary::resolve_super_or_fail(_class_name,
5913 super_class_name,
5914 loader,
5915 _protection_domain,
5916 true,
5917 CHECK);
5918 }
5919 }
5920
5921 if (_super_klass != nullptr) {
5922 if (_super_klass->has_nonstatic_concrete_methods()) {
5923 _has_nonstatic_concrete_methods = true;
5924 }
5925
5926 if (_super_klass->is_interface()) {
5927 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
5928 return;
5929 }
5930 }
5931
5932 // Compute the transitive list of all unique interfaces implemented by this class
5933 _transitive_interfaces =
5934 compute_transitive_interfaces(_super_klass,
5935 _local_interfaces,
5936 _loader_data,
5937 CHECK);
5938
5939 assert(_transitive_interfaces != nullptr, "invariant");
5940
5941 // sort methods
5942 _method_ordering = sort_methods(_methods);
5943
5944 _all_mirandas = new GrowableArray<Method*>(20);
5945
5946 Handle loader(THREAD, _loader_data->class_loader());
5947 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
5948 &_num_miranda_methods,
5949 _all_mirandas,
5950 _super_klass,
5951 _methods,
5952 _access_flags,
5953 _major_version,
5954 loader,
5955 _class_name,
5956 _local_interfaces);
5957
5958 // Size of Java itable (in words)
5959 _itable_size = _access_flags.is_interface() ? 0 :
5960 klassItable::compute_itable_size(_transitive_interfaces);
5961
5962 assert(_fac != nullptr, "invariant");
5963 assert(_parsed_annotations != nullptr, "invariant");
5964
5965 _field_info = new FieldLayoutInfo();
5966 FieldLayoutBuilder lb(class_name(), super_klass(), _cp, /*_fields*/ _temp_field_info,
5967 _parsed_annotations->is_contended(), _field_info);
5968 lb.build_layout();
5969
5970 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
5971 _fieldinfo_stream =
5972 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
5973 injected_fields_count, loader_data(), CHECK);
5974 _fields_status =
5975 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
5976 FieldStatus(0), CHECK);
5977 }
5978
5979 void ClassFileParser::set_klass(InstanceKlass* klass) {
5980
5981 #ifdef ASSERT
5982 if (klass != nullptr) {
5983 assert(nullptr == _klass, "leaking?");
5984 }
5985 #endif
5986
5987 _klass = klass;
5988 }
5989
5990 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
5991
5992 #ifdef ASSERT
5993 if (klass != nullptr) {
5994 assert(nullptr == _klass_to_deallocate, "leaking?");
5995 }
5996 #endif
5997
5998 _klass_to_deallocate = klass;
5999 }
6000
6001 // Caller responsible for ResourceMark
6002 // clone stream with rewound position
6003 const ClassFileStream* ClassFileParser::clone_stream() const {
6004 assert(_stream != nullptr, "invariant");
6005
6006 return _stream->clone();
6007 }
6008
6009 ReferenceType ClassFileParser::super_reference_type() const {
6010 return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type();
6011 }
6012
6013 bool ClassFileParser::is_instance_ref_klass() const {
6014 // Only the subclasses of j.l.r.Reference are InstanceRefKlass.
6015 // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
6016 // klass requiring special treatment in ref-processing. The abstract
6017 // j.l.r.Reference cannot be instantiated so doesn't partake in
6018 // ref-processing.
6019 return is_java_lang_ref_Reference_subclass();
6020 }
6021
6022 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
6023 if (_super_klass == nullptr) {
6024 return false;
6025 }
6026
6027 if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
6028 // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
6029 return true;
6030 }
6031
6032 return _super_klass->reference_type() != REF_NONE;
6033 }
6034
6035 // ----------------------------------------------------------------------------
6036 // debugging
6037
6038 #ifdef ASSERT
6039
6040 // return true if class_name contains no '.' (internal format is '/')
6041 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6042 if (class_name != nullptr) {
6043 ResourceMark rm;
6044 char* name = class_name->as_C_string();
6045 return strchr(name, JVM_SIGNATURE_DOT) == nullptr;
6046 } else {
6047 return true;
6048 }
6049 }
6050
6051 #endif