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