1 /*
2 * Copyright (c) 1997, 2024, 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 #define JAVA_23_VERSION 67
153
154 #define JAVA_24_VERSION 68
155
156 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
157 assert((bad_constant == JVM_CONSTANT_Module ||
158 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
159 "Unexpected bad constant pool entry");
160 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
161 }
162
163 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
164 ConstantPool* cp,
165 const int length,
166 TRAPS) {
167 assert(stream != nullptr, "invariant");
168 assert(cp != nullptr, "invariant");
169
170 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
171 // this function (_current can be allocated in a register, with scalar
172 // replacement of aggregates). The _current pointer is copied back to
173 // stream() when this function returns. DON'T call another method within
174 // this method that uses stream().
175 const ClassFileStream cfs1 = *stream;
176 const ClassFileStream* const cfs = &cfs1;
177
178 debug_only(const u1* const old_current = stream->current();)
179
180 // Used for batching symbol allocations.
181 const char* names[SymbolTable::symbol_alloc_batch_size];
182 int lengths[SymbolTable::symbol_alloc_batch_size];
183 int indices[SymbolTable::symbol_alloc_batch_size];
184 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
185 int names_count = 0;
186
187 // parsing Index 0 is unused
188 for (int index = 1; index < length; index++) {
189 // Each of the following case guarantees one more byte in the stream
190 // for the following tag or the access_flags following constant pool,
191 // so we don't need bounds-check for reading tag.
192 const u1 tag = cfs->get_u1_fast();
193 switch (tag) {
194 case JVM_CONSTANT_Class : {
195 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
196 const u2 name_index = cfs->get_u2_fast();
197 cp->klass_index_at_put(index, name_index);
198 break;
199 }
200 case JVM_CONSTANT_Fieldref: {
201 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
202 const u2 class_index = cfs->get_u2_fast();
203 const u2 name_and_type_index = cfs->get_u2_fast();
204 cp->field_at_put(index, class_index, name_and_type_index);
205 break;
206 }
207 case JVM_CONSTANT_Methodref: {
208 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
209 const u2 class_index = cfs->get_u2_fast();
210 const u2 name_and_type_index = cfs->get_u2_fast();
211 cp->method_at_put(index, class_index, name_and_type_index);
212 break;
213 }
214 case JVM_CONSTANT_InterfaceMethodref: {
215 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
216 const u2 class_index = cfs->get_u2_fast();
217 const u2 name_and_type_index = cfs->get_u2_fast();
218 cp->interface_method_at_put(index, class_index, name_and_type_index);
219 break;
220 }
221 case JVM_CONSTANT_String : {
222 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
223 const u2 string_index = cfs->get_u2_fast();
224 cp->string_index_at_put(index, string_index);
225 break;
226 }
227 case JVM_CONSTANT_MethodHandle :
228 case JVM_CONSTANT_MethodType: {
229 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
230 classfile_parse_error(
231 "Class file version does not support constant tag %u in class file %s",
232 tag, THREAD);
233 return;
234 }
235 if (tag == JVM_CONSTANT_MethodHandle) {
236 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
237 const u1 ref_kind = cfs->get_u1_fast();
238 const u2 method_index = cfs->get_u2_fast();
239 cp->method_handle_index_at_put(index, ref_kind, method_index);
240 }
241 else if (tag == JVM_CONSTANT_MethodType) {
242 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
243 const u2 signature_index = cfs->get_u2_fast();
244 cp->method_type_index_at_put(index, signature_index);
245 }
246 else {
247 ShouldNotReachHere();
248 }
249 break;
250 }
251 case JVM_CONSTANT_Dynamic : {
252 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
253 classfile_parse_error(
254 "Class file version does not support constant tag %u in class file %s",
255 tag, THREAD);
256 return;
257 }
258 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
259 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
260 const u2 name_and_type_index = cfs->get_u2_fast();
261 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
262 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
263 }
264 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
265 break;
266 }
267 case JVM_CONSTANT_InvokeDynamic : {
268 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
269 classfile_parse_error(
270 "Class file version does not support constant tag %u in class file %s",
271 tag, THREAD);
272 return;
273 }
274 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
275 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
276 const u2 name_and_type_index = cfs->get_u2_fast();
277 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
278 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
279 }
280 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
281 break;
282 }
283 case JVM_CONSTANT_Integer: {
284 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
285 const u4 bytes = cfs->get_u4_fast();
286 cp->int_at_put(index, (jint)bytes);
287 break;
288 }
289 case JVM_CONSTANT_Float: {
290 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
291 const u4 bytes = cfs->get_u4_fast();
292 cp->float_at_put(index, *(jfloat*)&bytes);
293 break;
294 }
295 case JVM_CONSTANT_Long: {
296 // A mangled type might cause you to overrun allocated memory
297 guarantee_property(index + 1 < length,
298 "Invalid constant pool entry %u in class file %s",
299 index,
300 CHECK);
301 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
302 const u8 bytes = cfs->get_u8_fast();
303 cp->long_at_put(index, bytes);
304 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
305 break;
306 }
307 case JVM_CONSTANT_Double: {
308 // A mangled type might cause you to overrun allocated memory
309 guarantee_property(index+1 < length,
310 "Invalid constant pool entry %u in class file %s",
311 index,
312 CHECK);
313 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
314 const u8 bytes = cfs->get_u8_fast();
315 cp->double_at_put(index, *(jdouble*)&bytes);
316 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
317 break;
318 }
319 case JVM_CONSTANT_NameAndType: {
320 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
321 const u2 name_index = cfs->get_u2_fast();
322 const u2 signature_index = cfs->get_u2_fast();
323 cp->name_and_type_at_put(index, name_index, signature_index);
324 break;
325 }
326 case JVM_CONSTANT_Utf8 : {
327 cfs->guarantee_more(2, CHECK); // utf8_length
328 u2 utf8_length = cfs->get_u2_fast();
329 const u1* utf8_buffer = cfs->current();
330 assert(utf8_buffer != nullptr, "null utf8 buffer");
331 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
332 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
333 cfs->skip_u1_fast(utf8_length);
334
335 // Before storing the symbol, make sure it's legal
336 if (_need_verify) {
337 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
338 }
339
340 unsigned int hash;
341 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
342 utf8_length,
343 hash);
344 if (result == nullptr) {
345 names[names_count] = (const char*)utf8_buffer;
346 lengths[names_count] = utf8_length;
347 indices[names_count] = index;
348 hashValues[names_count++] = hash;
349 if (names_count == SymbolTable::symbol_alloc_batch_size) {
350 SymbolTable::new_symbols(_loader_data,
351 constantPoolHandle(THREAD, cp),
352 names_count,
353 names,
354 lengths,
355 indices,
356 hashValues);
357 names_count = 0;
358 }
359 } else {
360 cp->symbol_at_put(index, result);
361 }
362 break;
363 }
364 case JVM_CONSTANT_Module:
365 case JVM_CONSTANT_Package: {
366 // Record that an error occurred in these two cases but keep parsing so
367 // that ACC_Module can be checked for in the access_flags. Need to
368 // throw NoClassDefFoundError in that case.
369 if (_major_version >= JAVA_9_VERSION) {
370 cfs->guarantee_more(3, CHECK);
371 cfs->get_u2_fast();
372 set_class_bad_constant_seen(tag);
373 break;
374 }
375 }
376 default: {
377 classfile_parse_error("Unknown constant tag %u in class file %s",
378 tag,
379 THREAD);
380 return;
381 }
382 } // end of switch(tag)
383 } // end of for
384
385 // Allocate the remaining symbols
386 if (names_count > 0) {
387 SymbolTable::new_symbols(_loader_data,
388 constantPoolHandle(THREAD, cp),
389 names_count,
390 names,
391 lengths,
392 indices,
393 hashValues);
394 }
395
396 // Copy _current pointer of local copy back to stream.
397 assert(stream->current() == old_current, "non-exclusive use of stream");
398 stream->set_current(cfs1.current());
399
400 }
401
402 static inline bool valid_cp_range(int index, int length) {
403 return (index > 0 && index < length);
404 }
405
406 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
407 assert(cp != nullptr, "invariant");
408 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
409 return cp->symbol_at(index);
410 }
411 return nullptr;
412 }
413
414 #ifdef ASSERT
415 PRAGMA_DIAG_PUSH
416 PRAGMA_FORMAT_NONLITERAL_IGNORED
417 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
418 ResourceMark rm(THREAD);
419 fatal(msg, _class_name->as_C_string());
420 }
421
422 void ClassFileParser::report_assert_property_failure(const char* msg,
423 int index,
424 TRAPS) const {
425 ResourceMark rm(THREAD);
426 fatal(msg, index, _class_name->as_C_string());
427 }
428 PRAGMA_DIAG_POP
429 #endif
430
431 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
432 ConstantPool* const cp,
433 const int length,
434 TRAPS) {
435 assert(cp != nullptr, "invariant");
436 assert(stream != nullptr, "invariant");
437
438 // parsing constant pool entries
439 parse_constant_pool_entries(stream, cp, length, CHECK);
440 if (class_bad_constant_seen() != 0) {
441 // a bad CP entry has been detected previously so stop parsing and just return.
442 return;
443 }
444
445 int index = 1; // declared outside of loops for portability
446 int num_klasses = 0;
447
448 // first verification pass - validate cross references
449 // and fixup class and string constants
450 for (index = 1; index < length; index++) { // Index 0 is unused
451 const jbyte tag = cp->tag_at(index).value();
452 switch (tag) {
453 case JVM_CONSTANT_Class: {
454 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
455 break;
456 }
457 case JVM_CONSTANT_Fieldref:
458 // fall through
459 case JVM_CONSTANT_Methodref:
460 // fall through
461 case JVM_CONSTANT_InterfaceMethodref: {
462 if (!_need_verify) break;
463 const int klass_ref_index = cp->uncached_klass_ref_index_at(index);
464 const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index);
465 check_property(valid_klass_reference_at(klass_ref_index),
466 "Invalid constant pool index %u in class file %s",
467 klass_ref_index, CHECK);
468 check_property(valid_cp_range(name_and_type_ref_index, length) &&
469 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
470 "Invalid constant pool index %u in class file %s",
471 name_and_type_ref_index, CHECK);
472 break;
473 }
474 case JVM_CONSTANT_String: {
475 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
476 break;
477 }
478 case JVM_CONSTANT_Integer:
479 break;
480 case JVM_CONSTANT_Float:
481 break;
482 case JVM_CONSTANT_Long:
483 case JVM_CONSTANT_Double: {
484 index++;
485 check_property(
486 (index < length && cp->tag_at(index).is_invalid()),
487 "Improper constant pool long/double index %u in class file %s",
488 index, CHECK);
489 break;
490 }
491 case JVM_CONSTANT_NameAndType: {
492 if (!_need_verify) break;
493 const int name_ref_index = cp->name_ref_index_at(index);
494 const int signature_ref_index = cp->signature_ref_index_at(index);
495 check_property(valid_symbol_at(name_ref_index),
496 "Invalid constant pool index %u in class file %s",
497 name_ref_index, CHECK);
498 check_property(valid_symbol_at(signature_ref_index),
499 "Invalid constant pool index %u in class file %s",
500 signature_ref_index, CHECK);
501 break;
502 }
503 case JVM_CONSTANT_Utf8:
504 break;
505 case JVM_CONSTANT_UnresolvedClass: // fall-through
506 case JVM_CONSTANT_UnresolvedClassInError: {
507 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
508 break;
509 }
510 case JVM_CONSTANT_ClassIndex: {
511 const int class_index = cp->klass_index_at(index);
512 check_property(valid_symbol_at(class_index),
513 "Invalid constant pool index %u in class file %s",
514 class_index, CHECK);
515 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
516 break;
517 }
518 case JVM_CONSTANT_StringIndex: {
519 const int string_index = cp->string_index_at(index);
520 check_property(valid_symbol_at(string_index),
521 "Invalid constant pool index %u in class file %s",
522 string_index, CHECK);
523 Symbol* const sym = cp->symbol_at(string_index);
524 cp->unresolved_string_at_put(index, sym);
525 break;
526 }
527 case JVM_CONSTANT_MethodHandle: {
528 const int ref_index = cp->method_handle_index_at(index);
529 check_property(valid_cp_range(ref_index, length),
530 "Invalid constant pool index %u in class file %s",
531 ref_index, CHECK);
532 const constantTag tag = cp->tag_at(ref_index);
533 const int ref_kind = cp->method_handle_ref_kind_at(index);
534
535 switch (ref_kind) {
536 case JVM_REF_getField:
537 case JVM_REF_getStatic:
538 case JVM_REF_putField:
539 case JVM_REF_putStatic: {
540 check_property(
541 tag.is_field(),
542 "Invalid constant pool index %u in class file %s (not a field)",
543 ref_index, CHECK);
544 break;
545 }
546 case JVM_REF_invokeVirtual:
547 case JVM_REF_newInvokeSpecial: {
548 check_property(
549 tag.is_method(),
550 "Invalid constant pool index %u in class file %s (not a method)",
551 ref_index, CHECK);
552 break;
553 }
554 case JVM_REF_invokeStatic:
555 case JVM_REF_invokeSpecial: {
556 check_property(
557 tag.is_method() ||
558 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
559 "Invalid constant pool index %u in class file %s (not a method)",
560 ref_index, CHECK);
561 break;
562 }
563 case JVM_REF_invokeInterface: {
564 check_property(
565 tag.is_interface_method(),
566 "Invalid constant pool index %u in class file %s (not an interface method)",
567 ref_index, CHECK);
568 break;
569 }
570 default: {
571 classfile_parse_error(
572 "Bad method handle kind at constant pool index %u in class file %s",
573 index, THREAD);
574 return;
575 }
576 } // switch(refkind)
577 // Keep the ref_index unchanged. It will be indirected at link-time.
578 break;
579 } // case MethodHandle
580 case JVM_CONSTANT_MethodType: {
581 const int ref_index = cp->method_type_index_at(index);
582 check_property(valid_symbol_at(ref_index),
583 "Invalid constant pool index %u in class file %s",
584 ref_index, CHECK);
585 break;
586 }
587 case JVM_CONSTANT_Dynamic: {
588 const int name_and_type_ref_index =
589 cp->bootstrap_name_and_type_ref_index_at(index);
590
591 check_property(valid_cp_range(name_and_type_ref_index, length) &&
592 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
593 "Invalid constant pool index %u in class file %s",
594 name_and_type_ref_index, CHECK);
595 // bootstrap specifier index must be checked later,
596 // when BootstrapMethods attr is available
597
598 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
599 cp->set_has_dynamic_constant();
600 break;
601 }
602 case JVM_CONSTANT_InvokeDynamic: {
603 const int name_and_type_ref_index =
604 cp->bootstrap_name_and_type_ref_index_at(index);
605
606 check_property(valid_cp_range(name_and_type_ref_index, length) &&
607 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
608 "Invalid constant pool index %u in class file %s",
609 name_and_type_ref_index, CHECK);
610 // bootstrap specifier index must be checked later,
611 // when BootstrapMethods attr is available
612 break;
613 }
614 default: {
615 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
616 ShouldNotReachHere();
617 break;
618 }
619 } // switch(tag)
620 } // end of for
621
622 cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
623
624 if (!_need_verify) {
625 return;
626 }
627
628 // second verification pass - checks the strings are of the right format.
629 // but not yet to the other entries
630 for (index = 1; index < length; index++) {
631 const jbyte tag = cp->tag_at(index).value();
632 switch (tag) {
633 case JVM_CONSTANT_UnresolvedClass: {
634 const Symbol* const class_name = cp->klass_name_at(index);
635 // check the name
636 verify_legal_class_name(class_name, CHECK);
637 break;
638 }
639 case JVM_CONSTANT_NameAndType: {
640 if (_need_verify) {
641 const int sig_index = cp->signature_ref_index_at(index);
642 const int name_index = cp->name_ref_index_at(index);
643 const Symbol* const name = cp->symbol_at(name_index);
644 const Symbol* const sig = cp->symbol_at(sig_index);
645 guarantee_property(sig->utf8_length() != 0,
646 "Illegal zero length constant pool entry at %d in class %s",
647 sig_index, CHECK);
648 guarantee_property(name->utf8_length() != 0,
649 "Illegal zero length constant pool entry at %d in class %s",
650 name_index, CHECK);
651
652 if (Signature::is_method(sig)) {
653 // Format check method name and signature
654 verify_legal_method_name(name, CHECK);
655 verify_legal_method_signature(name, sig, CHECK);
656 } else {
657 // Format check field name and signature
658 verify_legal_field_name(name, CHECK);
659 verify_legal_field_signature(name, sig, CHECK);
660 }
661 }
662 break;
663 }
664 case JVM_CONSTANT_Dynamic: {
665 const int name_and_type_ref_index =
666 cp->uncached_name_and_type_ref_index_at(index);
667 // already verified to be utf8
668 const int name_ref_index =
669 cp->name_ref_index_at(name_and_type_ref_index);
670 // already verified to be utf8
671 const int signature_ref_index =
672 cp->signature_ref_index_at(name_and_type_ref_index);
673 const Symbol* const name = cp->symbol_at(name_ref_index);
674 const Symbol* const signature = cp->symbol_at(signature_ref_index);
675 if (_need_verify) {
676 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
677 // Need only to be sure signature is the right type.
678 if (Signature::is_method(signature)) {
679 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
680 }
681 }
682 break;
683 }
684 case JVM_CONSTANT_InvokeDynamic:
685 case JVM_CONSTANT_Fieldref:
686 case JVM_CONSTANT_Methodref:
687 case JVM_CONSTANT_InterfaceMethodref: {
688 const int name_and_type_ref_index =
689 cp->uncached_name_and_type_ref_index_at(index);
690 // already verified to be utf8
691 const int name_ref_index =
692 cp->name_ref_index_at(name_and_type_ref_index);
693 // already verified to be utf8
694 const int signature_ref_index =
695 cp->signature_ref_index_at(name_and_type_ref_index);
696 const Symbol* const name = cp->symbol_at(name_ref_index);
697 const Symbol* const signature = cp->symbol_at(signature_ref_index);
698 if (tag == JVM_CONSTANT_Fieldref) {
699 if (_need_verify) {
700 // Field name and signature are verified above, when iterating NameAndType_info.
701 // Need only to be sure signature is non-zero length and the right type.
702 if (Signature::is_method(signature)) {
703 throwIllegalSignature("Field", name, signature, CHECK);
704 }
705 }
706 } else {
707 if (_need_verify) {
708 // Method name and signature are individually verified above, when iterating
709 // NameAndType_info. Need to check here that signature is non-zero length and
710 // the right type.
711 if (!Signature::is_method(signature)) {
712 throwIllegalSignature("Method", name, signature, CHECK);
713 }
714 }
715 // If a class method name begins with '<', it must be "<init>" and have void signature.
716 const unsigned int name_len = name->utf8_length();
717 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
718 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
719 if (name != vmSymbols::object_initializer_name()) {
720 classfile_parse_error(
721 "Bad method name at constant pool index %u in class file %s",
722 name_ref_index, THREAD);
723 return;
724 } else if (!Signature::is_void_method(signature)) { // must have void signature.
725 throwIllegalSignature("Method", name, signature, CHECK);
726 }
727 }
728 }
729 break;
730 }
731 case JVM_CONSTANT_MethodHandle: {
732 const int ref_index = cp->method_handle_index_at(index);
733 const int ref_kind = cp->method_handle_ref_kind_at(index);
734 switch (ref_kind) {
735 case JVM_REF_invokeVirtual:
736 case JVM_REF_invokeStatic:
737 case JVM_REF_invokeSpecial:
738 case JVM_REF_newInvokeSpecial: {
739 const int name_and_type_ref_index =
740 cp->uncached_name_and_type_ref_index_at(ref_index);
741 const int name_ref_index =
742 cp->name_ref_index_at(name_and_type_ref_index);
743 const Symbol* const name = cp->symbol_at(name_ref_index);
744 if (ref_kind == JVM_REF_newInvokeSpecial) {
745 if (name != vmSymbols::object_initializer_name()) {
746 classfile_parse_error(
747 "Bad constructor name at constant pool index %u in class file %s",
748 name_ref_index, THREAD);
749 return;
750 }
751 } else {
752 if (name == vmSymbols::object_initializer_name()) {
753 classfile_parse_error(
754 "Bad method name at constant pool index %u in class file %s",
755 name_ref_index, THREAD);
756 return;
757 }
758 }
759 break;
760 }
761 // Other ref_kinds are already fully checked in previous pass.
762 } // switch(ref_kind)
763 break;
764 }
765 case JVM_CONSTANT_MethodType: {
766 const Symbol* const no_name = vmSymbols::type_name(); // place holder
767 const Symbol* const signature = cp->method_type_signature_at(index);
768 verify_legal_method_signature(no_name, signature, CHECK);
769 break;
770 }
771 case JVM_CONSTANT_Utf8: {
772 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
773 }
774 } // switch(tag)
775 } // end of for
776 }
777
778 class NameSigHash: public ResourceObj {
779 public:
780 const Symbol* _name; // name
781 const Symbol* _sig; // signature
782
783 static const int HASH_ROW_SIZE = 256;
784
785 NameSigHash(Symbol* name, Symbol* sig) :
786 _name(name),
787 _sig(sig) {}
788
789 static unsigned int hash(NameSigHash const& namesig) {
790 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
791 }
792
793 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
794 return (e0._name == e1._name) &&
795 (e0._sig == e1._sig);
796 }
797 };
798
799 using NameSigHashtable = ResourceHashtable<NameSigHash, int,
800 NameSigHash::HASH_ROW_SIZE,
801 AnyObj::RESOURCE_AREA, mtInternal,
802 &NameSigHash::hash, &NameSigHash::equals>;
803
804 // Side-effects: populates the _local_interfaces field
805 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
806 const int itfs_len,
807 ConstantPool* const cp,
808 bool* const has_nonstatic_concrete_methods,
809 TRAPS) {
810 assert(stream != nullptr, "invariant");
811 assert(cp != nullptr, "invariant");
812 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
813
814 if (itfs_len == 0) {
815 _local_interfaces = Universe::the_empty_instance_klass_array();
816 } else {
817 assert(itfs_len > 0, "only called for len>0");
818 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
819
820 int index;
821 for (index = 0; index < itfs_len; index++) {
822 const u2 interface_index = stream->get_u2(CHECK);
823 Klass* interf;
824 check_property(
825 valid_klass_reference_at(interface_index),
826 "Interface name has bad constant pool index %u in class file %s",
827 interface_index, CHECK);
828 if (cp->tag_at(interface_index).is_klass()) {
829 interf = cp->resolved_klass_at(interface_index);
830 } else {
831 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
832
833 // Don't need to check legal name because it's checked when parsing constant pool.
834 // But need to make sure it's not an array type.
835 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
836 "Bad interface name in class file %s", CHECK);
837
838 // Call resolve on the interface class name with class circularity checking
839 interf = SystemDictionary::resolve_super_or_fail(_class_name,
840 unresolved_klass,
841 Handle(THREAD, _loader_data->class_loader()),
842 _protection_domain,
843 false, CHECK);
844 }
845
846 if (!interf->is_interface()) {
847 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
848 err_msg("class %s can not implement %s, because it is not an interface (%s)",
849 _class_name->as_klass_external_name(),
850 interf->external_name(),
851 interf->class_in_module_of_loader()));
852 }
853
854 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
855 *has_nonstatic_concrete_methods = true;
856 }
857 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
858 }
859
860 if (!_need_verify || itfs_len <= 1) {
861 return;
862 }
863
864 // Check if there's any duplicates in interfaces
865 ResourceMark rm(THREAD);
866 // Set containing interface names
867 ResourceHashtable<Symbol*, int>* interface_names = new ResourceHashtable<Symbol*, int>();
868 for (index = 0; index < itfs_len; index++) {
869 const InstanceKlass* const k = _local_interfaces->at(index);
870 Symbol* interface_name = k->name();
871 // If no duplicates, add (name, nullptr) in hashtable interface_names.
872 if (!interface_names->put(interface_name, 0)) {
873 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
874 interface_name->as_C_string(), THREAD);
875 return;
876 }
877 }
878 }
879 }
880
881 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
882 int constantvalue_index,
883 int signature_index,
884 TRAPS) const {
885 // Make sure the constant pool entry is of a type appropriate to this field
886 guarantee_property(
887 (constantvalue_index > 0 &&
888 constantvalue_index < cp->length()),
889 "Bad initial value index %u in ConstantValue attribute in class file %s",
890 constantvalue_index, CHECK);
891
892 const constantTag value_type = cp->tag_at(constantvalue_index);
893 switch(cp->basic_type_for_signature_at(signature_index)) {
894 case T_LONG: {
895 guarantee_property(value_type.is_long(),
896 "Inconsistent constant value type in class file %s",
897 CHECK);
898 break;
899 }
900 case T_FLOAT: {
901 guarantee_property(value_type.is_float(),
902 "Inconsistent constant value type in class file %s",
903 CHECK);
904 break;
905 }
906 case T_DOUBLE: {
907 guarantee_property(value_type.is_double(),
908 "Inconsistent constant value type in class file %s",
909 CHECK);
910 break;
911 }
912 case T_BYTE:
913 case T_CHAR:
914 case T_SHORT:
915 case T_BOOLEAN:
916 case T_INT: {
917 guarantee_property(value_type.is_int(),
918 "Inconsistent constant value type in class file %s",
919 CHECK);
920 break;
921 }
922 case T_OBJECT: {
923 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
924 && value_type.is_string()),
925 "Bad string initial value in class file %s",
926 CHECK);
927 break;
928 }
929 default: {
930 classfile_parse_error("Unable to set initial value %u in class file %s",
931 constantvalue_index,
932 THREAD);
933 }
934 }
935 }
936
937 class AnnotationCollector : public ResourceObj{
938 public:
939 enum Location { _in_field, _in_method, _in_class };
940 enum ID {
941 _unknown = 0,
942 _method_CallerSensitive,
943 _method_ForceInline,
944 _method_DontInline,
945 _method_ChangesCurrentThread,
946 _method_JvmtiMountTransition,
947 _method_InjectedProfile,
948 _method_LambdaForm_Compiled,
949 _method_Hidden,
950 _method_Scoped,
951 _method_IntrinsicCandidate,
952 _jdk_internal_vm_annotation_Contended,
953 _field_Stable,
954 _jdk_internal_vm_annotation_ReservedStackAccess,
955 _jdk_internal_ValueBased,
956 _java_lang_Deprecated,
957 _java_lang_Deprecated_for_removal,
958 _annotation_LIMIT
959 };
960 const Location _location;
961 int _annotations_present;
962 u2 _contended_group;
963
964 AnnotationCollector(Location location)
965 : _location(location), _annotations_present(0), _contended_group(0)
966 {
967 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
968 }
969 // If this annotation name has an ID, report it (or _none).
970 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
971 // Set the annotation name:
972 void set_annotation(ID id) {
973 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
974 _annotations_present |= (int)nth_bit((int)id);
975 }
976
977 void remove_annotation(ID id) {
978 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
979 _annotations_present &= (int)~nth_bit((int)id);
980 }
981
982 // Report if the annotation is present.
983 bool has_any_annotations() const { return _annotations_present != 0; }
984 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
985
986 void set_contended_group(u2 group) { _contended_group = group; }
987 u2 contended_group() const { return _contended_group; }
988
989 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
990
991 void set_stable(bool stable) { set_annotation(_field_Stable); }
992 bool is_stable() const { return has_annotation(_field_Stable); }
993 };
994
995 // This class also doubles as a holder for metadata cleanup.
996 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
997 private:
998 ClassLoaderData* _loader_data;
999 AnnotationArray* _field_annotations;
1000 AnnotationArray* _field_type_annotations;
1001 public:
1002 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1003 AnnotationCollector(_in_field),
1004 _loader_data(loader_data),
1005 _field_annotations(nullptr),
1006 _field_type_annotations(nullptr) {}
1007 ~FieldAnnotationCollector();
1008 void apply_to(FieldInfo* f);
1009 AnnotationArray* field_annotations() { return _field_annotations; }
1010 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1011
1012 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1013 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1014 };
1015
1016 class MethodAnnotationCollector : public AnnotationCollector{
1017 public:
1018 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1019 void apply_to(const methodHandle& m);
1020 };
1021
1022 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1023 public:
1024 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1025 void apply_to(InstanceKlass* ik);
1026 };
1027
1028
1029 static int skip_annotation_value(const u1*, int, int); // fwd decl
1030
1031 // Safely increment index by val if does not pass limit
1032 #define SAFE_ADD(index, limit, val) \
1033 if (index >= limit - val) return limit; \
1034 index += val;
1035
1036 // Skip an annotation. Return >=limit if there is any problem.
1037 static int skip_annotation(const u1* buffer, int limit, int index) {
1038 assert(buffer != nullptr, "invariant");
1039 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1040 // value := switch (tag:u1) { ... }
1041 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1042 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1043 while (--nmem >= 0 && index < limit) {
1044 SAFE_ADD(index, limit, 2); // skip member
1045 index = skip_annotation_value(buffer, limit, index);
1046 }
1047 return index;
1048 }
1049
1050 // Skip an annotation value. Return >=limit if there is any problem.
1051 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1052 assert(buffer != nullptr, "invariant");
1053
1054 // value := switch (tag:u1) {
1055 // case B, C, I, S, Z, D, F, J, c: con:u2;
1056 // case e: e_class:u2 e_name:u2;
1057 // case s: s_con:u2;
1058 // case [: do(nval:u2) {value};
1059 // case @: annotation;
1060 // case s: s_con:u2;
1061 // }
1062 SAFE_ADD(index, limit, 1); // read tag
1063 const u1 tag = buffer[index - 1];
1064 switch (tag) {
1065 case 'B':
1066 case 'C':
1067 case 'I':
1068 case 'S':
1069 case 'Z':
1070 case 'D':
1071 case 'F':
1072 case 'J':
1073 case 'c':
1074 case 's':
1075 SAFE_ADD(index, limit, 2); // skip con or s_con
1076 break;
1077 case 'e':
1078 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1079 break;
1080 case '[':
1081 {
1082 SAFE_ADD(index, limit, 2); // read nval
1083 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1084 while (--nval >= 0 && index < limit) {
1085 index = skip_annotation_value(buffer, limit, index);
1086 }
1087 }
1088 break;
1089 case '@':
1090 index = skip_annotation(buffer, limit, index);
1091 break;
1092 default:
1093 return limit; // bad tag byte
1094 }
1095 return index;
1096 }
1097
1098 // Sift through annotations, looking for those significant to the VM:
1099 static void parse_annotations(const ConstantPool* const cp,
1100 const u1* buffer, int limit,
1101 AnnotationCollector* coll,
1102 ClassLoaderData* loader_data,
1103 const bool can_access_vm_annotations) {
1104
1105 assert(cp != nullptr, "invariant");
1106 assert(buffer != nullptr, "invariant");
1107 assert(coll != nullptr, "invariant");
1108 assert(loader_data != nullptr, "invariant");
1109
1110 // annotations := do(nann:u2) {annotation}
1111 int index = 2; // read nann
1112 if (index >= limit) return;
1113 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1114 enum { // initial annotation layout
1115 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1116 count_off = 2, // u2 such as 1 (one value)
1117 member_off = 4, // utf8 such as 'value'
1118 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1119 e_tag_val = 'e',
1120 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1121 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1122 e_size = 11, // end of 'e' annotation
1123 c_tag_val = 'c', // payload is type
1124 c_con_off = 7, // utf8 payload, such as 'I'
1125 c_size = 9, // end of 'c' annotation
1126 s_tag_val = 's', // payload is String
1127 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1128 s_size = 9,
1129 b_tag_val = 'Z', // payload is boolean
1130 min_size = 6 // smallest possible size (zero members)
1131 };
1132 // Cannot add min_size to index in case of overflow MAX_INT
1133 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1134 int index0 = index;
1135 index = skip_annotation(buffer, limit, index);
1136 const u1* const abase = buffer + index0;
1137 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1138 const int count = Bytes::get_Java_u2((address)abase + count_off);
1139 const Symbol* const aname = check_symbol_at(cp, atype);
1140 if (aname == nullptr) break; // invalid annotation name
1141 const Symbol* member = nullptr;
1142 if (count >= 1) {
1143 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1144 member = check_symbol_at(cp, member_index);
1145 if (member == nullptr) break; // invalid member name
1146 }
1147
1148 // Here is where parsing particular annotations will take place.
1149 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1150 if (AnnotationCollector::_unknown == id) continue;
1151 coll->set_annotation(id);
1152 if (AnnotationCollector::_java_lang_Deprecated == id) {
1153 assert(count <= 2, "change this if more element-value pairs are added to the @Deprecated annotation");
1154 // @Deprecated can specify forRemoval=true
1155 const u1* offset = abase + member_off;
1156 for (int i = 0; i < count; ++i) {
1157 int member_index = Bytes::get_Java_u2((address)offset);
1158 offset += 2;
1159 member = check_symbol_at(cp, member_index);
1160 if (member == vmSymbols::since()) {
1161 assert(*((address)offset) == s_tag_val, "invariant");
1162 offset += 3;
1163 continue;
1164 }
1165 if (member == vmSymbols::for_removal()) {
1166 assert(*((address)offset) == b_tag_val, "invariant");
1167 const u2 boolean_value_index = Bytes::get_Java_u2((address)offset + 1);
1168 if (cp->int_at(boolean_value_index) == 1) {
1169 // forRemoval == true
1170 coll->set_annotation(AnnotationCollector::_java_lang_Deprecated_for_removal);
1171 }
1172 break;
1173 }
1174
1175 }
1176 continue;
1177 }
1178
1179 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1180 // @Contended can optionally specify the contention group.
1181 //
1182 // Contended group defines the equivalence class over the fields:
1183 // the fields within the same contended group are not treated distinct.
1184 // The only exception is default group, which does not incur the
1185 // equivalence. Naturally, contention group for classes is meaningless.
1186 //
1187 // While the contention group is specified as String, annotation
1188 // values are already interned, and we might as well use the constant
1189 // pool index as the group tag.
1190 //
1191 u2 group_index = 0; // default contended group
1192 if (count == 1
1193 && s_size == (index - index0) // match size
1194 && s_tag_val == *(abase + tag_off)
1195 && member == vmSymbols::value_name()) {
1196 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1197 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1198 group_index = 0; // default contended group
1199 }
1200 }
1201 coll->set_contended_group(group_index);
1202 }
1203 }
1204 }
1205
1206
1207 // Parse attributes for a field.
1208 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1209 u2 attributes_count,
1210 bool is_static, u2 signature_index,
1211 u2* const constantvalue_index_addr,
1212 bool* const is_synthetic_addr,
1213 u2* const generic_signature_index_addr,
1214 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1215 TRAPS) {
1216 assert(cfs != nullptr, "invariant");
1217 assert(constantvalue_index_addr != nullptr, "invariant");
1218 assert(is_synthetic_addr != nullptr, "invariant");
1219 assert(generic_signature_index_addr != nullptr, "invariant");
1220 assert(parsed_annotations != nullptr, "invariant");
1221 assert(attributes_count > 0, "attributes_count should be greater than 0");
1222
1223 u2 constantvalue_index = 0;
1224 u2 generic_signature_index = 0;
1225 bool is_synthetic = false;
1226 const u1* runtime_visible_annotations = nullptr;
1227 int runtime_visible_annotations_length = 0;
1228 const u1* runtime_visible_type_annotations = nullptr;
1229 int runtime_visible_type_annotations_length = 0;
1230 bool runtime_invisible_annotations_exists = false;
1231 bool runtime_invisible_type_annotations_exists = false;
1232 const ConstantPool* const cp = _cp;
1233
1234 while (attributes_count--) {
1235 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1236 const u2 attribute_name_index = cfs->get_u2_fast();
1237 const u4 attribute_length = cfs->get_u4_fast();
1238 check_property(valid_symbol_at(attribute_name_index),
1239 "Invalid field attribute index %u in class file %s",
1240 attribute_name_index,
1241 CHECK);
1242
1243 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1244 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1245 // ignore if non-static
1246 if (constantvalue_index != 0) {
1247 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
1248 return;
1249 }
1250 check_property(
1251 attribute_length == 2,
1252 "Invalid ConstantValue field attribute length %u in class file %s",
1253 attribute_length, CHECK);
1254
1255 constantvalue_index = cfs->get_u2(CHECK);
1256 if (_need_verify) {
1257 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1258 }
1259 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1260 if (attribute_length != 0) {
1261 classfile_parse_error(
1262 "Invalid Synthetic field attribute length %u in class file %s",
1263 attribute_length, THREAD);
1264 return;
1265 }
1266 is_synthetic = true;
1267 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1268 if (attribute_length != 0) {
1269 classfile_parse_error(
1270 "Invalid Deprecated field attribute length %u in class file %s",
1271 attribute_length, THREAD);
1272 return;
1273 }
1274 } else if (_major_version >= JAVA_1_5_VERSION) {
1275 if (attribute_name == vmSymbols::tag_signature()) {
1276 if (generic_signature_index != 0) {
1277 classfile_parse_error(
1278 "Multiple Signature attributes for field in class file %s", THREAD);
1279 return;
1280 }
1281 if (attribute_length != 2) {
1282 classfile_parse_error(
1283 "Wrong size %u for field's Signature attribute in class file %s",
1284 attribute_length, THREAD);
1285 return;
1286 }
1287 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1288 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1289 if (runtime_visible_annotations != nullptr) {
1290 classfile_parse_error(
1291 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
1292 return;
1293 }
1294 runtime_visible_annotations_length = attribute_length;
1295 runtime_visible_annotations = cfs->current();
1296 assert(runtime_visible_annotations != nullptr, "null visible annotations");
1297 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1298 parse_annotations(cp,
1299 runtime_visible_annotations,
1300 runtime_visible_annotations_length,
1301 parsed_annotations,
1302 _loader_data,
1303 _can_access_vm_annotations);
1304 cfs->skip_u1_fast(runtime_visible_annotations_length);
1305 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1306 if (runtime_invisible_annotations_exists) {
1307 classfile_parse_error(
1308 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
1309 return;
1310 }
1311 runtime_invisible_annotations_exists = true;
1312 cfs->skip_u1(attribute_length, CHECK);
1313 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1314 if (runtime_visible_type_annotations != nullptr) {
1315 classfile_parse_error(
1316 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
1317 return;
1318 }
1319 runtime_visible_type_annotations_length = attribute_length;
1320 runtime_visible_type_annotations = cfs->current();
1321 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
1322 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1323 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1324 if (runtime_invisible_type_annotations_exists) {
1325 classfile_parse_error(
1326 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
1327 return;
1328 } else {
1329 runtime_invisible_type_annotations_exists = true;
1330 }
1331 cfs->skip_u1(attribute_length, CHECK);
1332 } else {
1333 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1334 }
1335 } else {
1336 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1337 }
1338 }
1339
1340 *constantvalue_index_addr = constantvalue_index;
1341 *is_synthetic_addr = is_synthetic;
1342 *generic_signature_index_addr = generic_signature_index;
1343 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1344 runtime_visible_annotations_length,
1345 CHECK);
1346 parsed_annotations->set_field_annotations(a);
1347 a = allocate_annotations(runtime_visible_type_annotations,
1348 runtime_visible_type_annotations_length,
1349 CHECK);
1350 parsed_annotations->set_field_type_annotations(a);
1351 return;
1352 }
1353
1354
1355 // Field allocation types. Used for computing field offsets.
1356
1357 enum FieldAllocationType {
1358 STATIC_OOP, // Oops
1359 STATIC_BYTE, // Boolean, Byte, char
1360 STATIC_SHORT, // shorts
1361 STATIC_WORD, // ints
1362 STATIC_DOUBLE, // aligned long or double
1363 NONSTATIC_OOP,
1364 NONSTATIC_BYTE,
1365 NONSTATIC_SHORT,
1366 NONSTATIC_WORD,
1367 NONSTATIC_DOUBLE,
1368 MAX_FIELD_ALLOCATION_TYPE,
1369 BAD_ALLOCATION_TYPE = -1
1370 };
1371
1372 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1373 BAD_ALLOCATION_TYPE, // 0
1374 BAD_ALLOCATION_TYPE, // 1
1375 BAD_ALLOCATION_TYPE, // 2
1376 BAD_ALLOCATION_TYPE, // 3
1377 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1378 NONSTATIC_SHORT, // T_CHAR = 5,
1379 NONSTATIC_WORD, // T_FLOAT = 6,
1380 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1381 NONSTATIC_BYTE, // T_BYTE = 8,
1382 NONSTATIC_SHORT, // T_SHORT = 9,
1383 NONSTATIC_WORD, // T_INT = 10,
1384 NONSTATIC_DOUBLE, // T_LONG = 11,
1385 NONSTATIC_OOP, // T_OBJECT = 12,
1386 NONSTATIC_OOP, // T_ARRAY = 13,
1387 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1388 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1389 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1390 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1391 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1392 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1393 BAD_ALLOCATION_TYPE, // 0
1394 BAD_ALLOCATION_TYPE, // 1
1395 BAD_ALLOCATION_TYPE, // 2
1396 BAD_ALLOCATION_TYPE, // 3
1397 STATIC_BYTE , // T_BOOLEAN = 4,
1398 STATIC_SHORT, // T_CHAR = 5,
1399 STATIC_WORD, // T_FLOAT = 6,
1400 STATIC_DOUBLE, // T_DOUBLE = 7,
1401 STATIC_BYTE, // T_BYTE = 8,
1402 STATIC_SHORT, // T_SHORT = 9,
1403 STATIC_WORD, // T_INT = 10,
1404 STATIC_DOUBLE, // T_LONG = 11,
1405 STATIC_OOP, // T_OBJECT = 12,
1406 STATIC_OOP, // T_ARRAY = 13,
1407 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1408 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1409 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1410 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1411 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1412 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1413 };
1414
1415 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1416 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1417 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1418 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1419 return result;
1420 }
1421
1422 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1423 public:
1424 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1425
1426 FieldAllocationCount() {
1427 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1428 count[i] = 0;
1429 }
1430 }
1431
1432 void update(bool is_static, BasicType type) {
1433 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1434 if (atype != BAD_ALLOCATION_TYPE) {
1435 // Make sure there is no overflow with injected fields.
1436 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1437 count[atype]++;
1438 }
1439 }
1440 };
1441
1442 // Side-effects: populates the _fields, _fields_annotations,
1443 // _fields_type_annotations fields
1444 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1445 bool is_interface,
1446 FieldAllocationCount* const fac,
1447 ConstantPool* cp,
1448 const int cp_size,
1449 u2* const java_fields_count_ptr,
1450 TRAPS) {
1451
1452 assert(cfs != nullptr, "invariant");
1453 assert(fac != nullptr, "invariant");
1454 assert(cp != nullptr, "invariant");
1455 assert(java_fields_count_ptr != nullptr, "invariant");
1456
1457 assert(nullptr == _fields_annotations, "invariant");
1458 assert(nullptr == _fields_type_annotations, "invariant");
1459
1460 cfs->guarantee_more(2, CHECK); // length
1461 const u2 length = cfs->get_u2_fast();
1462 *java_fields_count_ptr = length;
1463
1464 int num_injected = 0;
1465 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1466 &num_injected);
1467 const int total_fields = length + num_injected;
1468
1469 // Allocate a temporary resource array to collect field data.
1470 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1471 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1472
1473 ResourceMark rm(THREAD);
1474 for (int n = 0; n < length; n++) {
1475 // access_flags, name_index, descriptor_index, attributes_count
1476 cfs->guarantee_more(8, CHECK);
1477
1478 AccessFlags access_flags;
1479 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1480 verify_legal_field_modifiers(flags, is_interface, CHECK);
1481 access_flags.set_flags(flags);
1482 FieldInfo::FieldFlags fieldFlags(0);
1483
1484 const u2 name_index = cfs->get_u2_fast();
1485 check_property(valid_symbol_at(name_index),
1486 "Invalid constant pool index %u for field name in class file %s",
1487 name_index, CHECK);
1488 const Symbol* const name = cp->symbol_at(name_index);
1489 verify_legal_field_name(name, CHECK);
1490
1491 const u2 signature_index = cfs->get_u2_fast();
1492 check_property(valid_symbol_at(signature_index),
1493 "Invalid constant pool index %u for field signature in class file %s",
1494 signature_index, CHECK);
1495 const Symbol* const sig = cp->symbol_at(signature_index);
1496 verify_legal_field_signature(name, sig, CHECK);
1497
1498 u2 constantvalue_index = 0;
1499 bool is_synthetic = false;
1500 u2 generic_signature_index = 0;
1501 const bool is_static = access_flags.is_static();
1502 FieldAnnotationCollector parsed_annotations(_loader_data);
1503
1504 const u2 attributes_count = cfs->get_u2_fast();
1505 if (attributes_count > 0) {
1506 parse_field_attributes(cfs,
1507 attributes_count,
1508 is_static,
1509 signature_index,
1510 &constantvalue_index,
1511 &is_synthetic,
1512 &generic_signature_index,
1513 &parsed_annotations,
1514 CHECK);
1515
1516 if (parsed_annotations.field_annotations() != nullptr) {
1517 if (_fields_annotations == nullptr) {
1518 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1519 _loader_data, length, nullptr,
1520 CHECK);
1521 }
1522 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1523 parsed_annotations.set_field_annotations(nullptr);
1524 }
1525 if (parsed_annotations.field_type_annotations() != nullptr) {
1526 if (_fields_type_annotations == nullptr) {
1527 _fields_type_annotations =
1528 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1529 length,
1530 nullptr,
1531 CHECK);
1532 }
1533 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1534 parsed_annotations.set_field_type_annotations(nullptr);
1535 }
1536
1537 if (is_synthetic) {
1538 access_flags.set_is_synthetic();
1539 }
1540 if (generic_signature_index != 0) {
1541 fieldFlags.update_generic(true);
1542 }
1543 }
1544
1545 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1546
1547 // Update FieldAllocationCount for this kind of field
1548 fac->update(is_static, type);
1549
1550 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1551 fi.set_index(n);
1552 if (fieldFlags.is_generic()) {
1553 fi.set_generic_signature_index(generic_signature_index);
1554 }
1555 parsed_annotations.apply_to(&fi);
1556 if (fi.field_flags().is_contended()) {
1557 _has_contended_fields = true;
1558 }
1559 _temp_field_info->append(fi);
1560 }
1561 assert(_temp_field_info->length() == length, "Must be");
1562
1563 int index = length;
1564 if (num_injected != 0) {
1565 for (int n = 0; n < num_injected; n++) {
1566 // Check for duplicates
1567 if (injected[n].may_be_java) {
1568 const Symbol* const name = injected[n].name();
1569 const Symbol* const signature = injected[n].signature();
1570 bool duplicate = false;
1571 for (int i = 0; i < length; i++) {
1572 const FieldInfo* const f = _temp_field_info->adr_at(i);
1573 if (name == cp->symbol_at(f->name_index()) &&
1574 signature == cp->symbol_at(f->signature_index())) {
1575 // Symbol is desclared in Java so skip this one
1576 duplicate = true;
1577 break;
1578 }
1579 }
1580 if (duplicate) {
1581 // These will be removed from the field array at the end
1582 continue;
1583 }
1584 }
1585
1586 // Injected field
1587 FieldInfo::FieldFlags fflags(0);
1588 fflags.update_injected(true);
1589 AccessFlags aflags;
1590 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1591 fi.set_index(index);
1592 _temp_field_info->append(fi);
1593
1594 // Update FieldAllocationCount for this kind of field
1595 const BasicType type = Signature::basic_type(injected[n].signature());
1596 fac->update(false, type);
1597 index++;
1598 }
1599 }
1600
1601 assert(_temp_field_info->length() == index, "Must be");
1602
1603 if (_need_verify && length > 1) {
1604 // Check duplicated fields
1605 ResourceMark rm(THREAD);
1606 // Set containing name-signature pairs
1607 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1608 for (int i = 0; i < _temp_field_info->length(); i++) {
1609 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1610 _temp_field_info->adr_at(i)->signature(_cp));
1611 // If no duplicates, add name/signature in hashtable names_and_sigs.
1612 if(!names_and_sigs->put(name_and_sig, 0)) {
1613 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1614 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1615 return;
1616 }
1617 }
1618 }
1619 }
1620
1621
1622 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1623 u4 code_length,
1624 u4 exception_table_length,
1625 TRAPS) {
1626 assert(cfs != nullptr, "invariant");
1627
1628 const unsafe_u2* const exception_table_start = cfs->current();
1629 assert(exception_table_start != nullptr, "null exception table");
1630
1631 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1632 // end_pc,
1633 // handler_pc,
1634 // catch_type_index
1635
1636 // Will check legal target after parsing code array in verifier.
1637 if (_need_verify) {
1638 for (unsigned int i = 0; i < exception_table_length; i++) {
1639 const u2 start_pc = cfs->get_u2_fast();
1640 const u2 end_pc = cfs->get_u2_fast();
1641 const u2 handler_pc = cfs->get_u2_fast();
1642 const u2 catch_type_index = cfs->get_u2_fast();
1643 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1644 "Illegal exception table range in class file %s",
1645 CHECK_NULL);
1646 guarantee_property(handler_pc < code_length,
1647 "Illegal exception table handler in class file %s",
1648 CHECK_NULL);
1649 if (catch_type_index != 0) {
1650 guarantee_property(valid_klass_reference_at(catch_type_index),
1651 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1652 }
1653 }
1654 } else {
1655 cfs->skip_u2_fast(exception_table_length * 4);
1656 }
1657 return exception_table_start;
1658 }
1659
1660 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1661 u4 code_length,
1662 CompressedLineNumberWriteStream**const write_stream,
1663 TRAPS) {
1664
1665 const ClassFileStream* const cfs = _stream;
1666 unsigned int num_entries = cfs->get_u2(CHECK);
1667
1668 // Each entry is a u2 start_pc, and a u2 line_number
1669 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1670
1671 // Verify line number attribute and table length
1672 check_property(
1673 code_attribute_length == sizeof(u2) + length_in_bytes,
1674 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1675
1676 cfs->guarantee_more(length_in_bytes, CHECK);
1677
1678 if ((*write_stream) == nullptr) {
1679 if (length_in_bytes > fixed_buffer_size) {
1680 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1681 } else {
1682 (*write_stream) = new CompressedLineNumberWriteStream(
1683 _linenumbertable_buffer, fixed_buffer_size);
1684 }
1685 }
1686
1687 while (num_entries-- > 0) {
1688 const u2 bci = cfs->get_u2_fast(); // start_pc
1689 const u2 line = cfs->get_u2_fast(); // line_number
1690 guarantee_property(bci < code_length,
1691 "Invalid pc in LineNumberTable in class file %s", CHECK);
1692 (*write_stream)->write_pair(bci, line);
1693 }
1694 }
1695
1696
1697 class LVT_Hash : public AllStatic {
1698 public:
1699
1700 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1701 /*
1702 * 3-tuple start_bci/length/slot has to be unique key,
1703 * so the following comparison seems to be redundant:
1704 * && elem->name_cp_index == entry->_elem->name_cp_index
1705 */
1706 return (e0.start_bci == e1.start_bci &&
1707 e0.length == e1.length &&
1708 e0.name_cp_index == e1.name_cp_index &&
1709 e0.slot == e1.slot);
1710 }
1711
1712 static unsigned int hash(LocalVariableTableElement const& e0) {
1713 unsigned int raw_hash = e0.start_bci;
1714
1715 raw_hash = e0.length + raw_hash * 37;
1716 raw_hash = e0.name_cp_index + raw_hash * 37;
1717 raw_hash = e0.slot + raw_hash * 37;
1718
1719 return raw_hash;
1720 }
1721 };
1722
1723
1724 // Class file LocalVariableTable elements.
1725 class Classfile_LVT_Element {
1726 public:
1727 u2 start_bci;
1728 u2 length;
1729 u2 name_cp_index;
1730 u2 descriptor_cp_index;
1731 u2 slot;
1732 };
1733
1734 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1735 LocalVariableTableElement* const lvt) {
1736 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1737 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1738 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1739 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1740 lvt->signature_cp_index = 0;
1741 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1742 }
1743
1744 // Function is used to parse both attributes:
1745 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1746 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1747 u4 code_length,
1748 u2 max_locals,
1749 u4 code_attribute_length,
1750 u2* const localvariable_table_length,
1751 bool isLVTT,
1752 TRAPS) {
1753 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1754 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1755 const unsigned int size = checked_cast<unsigned>(
1756 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2));
1757
1758 const ConstantPool* const cp = _cp;
1759
1760 // Verify local variable table attribute has right length
1761 if (_need_verify) {
1762 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1763 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1764 }
1765
1766 const unsafe_u2* const localvariable_table_start = cfs->current();
1767 assert(localvariable_table_start != nullptr, "null local variable table");
1768 if (!_need_verify) {
1769 cfs->skip_u2_fast(size);
1770 } else {
1771 cfs->guarantee_more(size * 2, CHECK_NULL);
1772 for(int i = 0; i < (*localvariable_table_length); i++) {
1773 const u2 start_pc = cfs->get_u2_fast();
1774 const u2 length = cfs->get_u2_fast();
1775 const u2 name_index = cfs->get_u2_fast();
1776 const u2 descriptor_index = cfs->get_u2_fast();
1777 const u2 index = cfs->get_u2_fast();
1778 // Assign to a u4 to avoid overflow
1779 const u4 end_pc = (u4)start_pc + (u4)length;
1780
1781 if (start_pc >= code_length) {
1782 classfile_parse_error(
1783 "Invalid start_pc %u in %s in class file %s",
1784 start_pc, tbl_name, THREAD);
1785 return nullptr;
1786 }
1787 if (end_pc > code_length) {
1788 classfile_parse_error(
1789 "Invalid length %u in %s in class file %s",
1790 length, tbl_name, THREAD);
1791 return nullptr;
1792 }
1793 const int cp_size = cp->length();
1794 guarantee_property(valid_symbol_at(name_index),
1795 "Name index %u in %s has bad constant type in class file %s",
1796 name_index, tbl_name, CHECK_NULL);
1797 guarantee_property(valid_symbol_at(descriptor_index),
1798 "Signature index %u in %s has bad constant type in class file %s",
1799 descriptor_index, tbl_name, CHECK_NULL);
1800
1801 const Symbol* const name = cp->symbol_at(name_index);
1802 const Symbol* const sig = cp->symbol_at(descriptor_index);
1803 verify_legal_field_name(name, CHECK_NULL);
1804 u2 extra_slot = 0;
1805 if (!isLVTT) {
1806 verify_legal_field_signature(name, sig, CHECK_NULL);
1807
1808 // 4894874: check special cases for double and long local variables
1809 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1810 sig == vmSymbols::type_signature(T_LONG)) {
1811 extra_slot = 1;
1812 }
1813 }
1814 guarantee_property((index + extra_slot) < max_locals,
1815 "Invalid index %u in %s in class file %s",
1816 index, tbl_name, CHECK_NULL);
1817 }
1818 }
1819 return localvariable_table_start;
1820 }
1821
1822 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1823 u4 code_attribute_length,
1824 TRAPS) {
1825 assert(cfs != nullptr, "invariant");
1826
1827 if (0 == code_attribute_length) {
1828 return nullptr;
1829 }
1830
1831 const u1* const stackmap_table_start = cfs->current();
1832 assert(stackmap_table_start != nullptr, "null stackmap table");
1833
1834 // check code_attribute_length
1835 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1836
1837 return stackmap_table_start;
1838 }
1839
1840 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1841 u2* const checked_exceptions_length,
1842 u4 method_attribute_length,
1843 TRAPS) {
1844 assert(cfs != nullptr, "invariant");
1845 assert(checked_exceptions_length != nullptr, "invariant");
1846
1847 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1848 *checked_exceptions_length = cfs->get_u2_fast();
1849 const unsigned int size =
1850 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1851 const unsafe_u2* const checked_exceptions_start = cfs->current();
1852 assert(checked_exceptions_start != nullptr, "null checked exceptions");
1853 if (!_need_verify) {
1854 cfs->skip_u2_fast(size);
1855 } else {
1856 // Verify each value in the checked exception table
1857 u2 checked_exception;
1858 const u2 len = *checked_exceptions_length;
1859 cfs->guarantee_more(2 * len, CHECK_NULL);
1860 for (int i = 0; i < len; i++) {
1861 checked_exception = cfs->get_u2_fast();
1862 check_property(
1863 valid_klass_reference_at(checked_exception),
1864 "Exception name has bad type at constant pool %u in class file %s",
1865 checked_exception, CHECK_NULL);
1866 }
1867 }
1868 // check exceptions attribute length
1869 if (_need_verify) {
1870 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1871 sizeof(u2) * size),
1872 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1873 }
1874 return checked_exceptions_start;
1875 }
1876
1877 void ClassFileParser::throwIllegalSignature(const char* type,
1878 const Symbol* name,
1879 const Symbol* sig,
1880 TRAPS) const {
1881 assert(name != nullptr, "invariant");
1882 assert(sig != nullptr, "invariant");
1883
1884 ResourceMark rm(THREAD);
1885 Exceptions::fthrow(THREAD_AND_LOCATION,
1886 vmSymbols::java_lang_ClassFormatError(),
1887 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1888 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1889 }
1890
1891 AnnotationCollector::ID
1892 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1893 const Symbol* name,
1894 const bool can_access_vm_annotations) {
1895 const vmSymbolID sid = vmSymbols::find_sid(name);
1896 // Privileged code can use all annotations. Other code silently drops some.
1897 const bool privileged = loader_data->is_boot_class_loader_data() ||
1898 loader_data->is_platform_class_loader_data() ||
1899 can_access_vm_annotations;
1900 switch (sid) {
1901 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1902 if (_location != _in_method) break; // only allow for methods
1903 if (!privileged) break; // only allow in privileged code
1904 return _method_CallerSensitive;
1905 }
1906 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1907 if (_location != _in_method) break; // only allow for methods
1908 if (!privileged) break; // only allow in privileged code
1909 return _method_ForceInline;
1910 }
1911 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
1912 if (_location != _in_method) break; // only allow for methods
1913 if (!privileged) break; // only allow in privileged code
1914 return _method_DontInline;
1915 }
1916 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
1917 if (_location != _in_method) break; // only allow for methods
1918 if (!privileged) break; // only allow in privileged code
1919 return _method_ChangesCurrentThread;
1920 }
1921 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
1922 if (_location != _in_method) break; // only allow for methods
1923 if (!privileged) break; // only allow in privileged code
1924 return _method_JvmtiMountTransition;
1925 }
1926 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
1927 if (_location != _in_method) break; // only allow for methods
1928 if (!privileged) break; // only allow in privileged code
1929 return _method_InjectedProfile;
1930 }
1931 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
1932 if (_location != _in_method) break; // only allow for methods
1933 if (!privileged) break; // only allow in privileged code
1934 return _method_LambdaForm_Compiled;
1935 }
1936 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
1937 if (_location != _in_method) break; // only allow for methods
1938 if (!privileged) break; // only allow in privileged code
1939 return _method_Hidden;
1940 }
1941 case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
1942 if (_location != _in_method) break; // only allow for methods
1943 if (!privileged) break; // only allow in privileged code
1944 return _method_Scoped;
1945 }
1946 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
1947 if (_location != _in_method) break; // only allow for methods
1948 if (!privileged) break; // only allow in privileged code
1949 return _method_IntrinsicCandidate;
1950 }
1951 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
1952 if (_location != _in_field) break; // only allow for fields
1953 if (!privileged) break; // only allow in privileged code
1954 return _field_Stable;
1955 }
1956 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1957 if (_location != _in_field && _location != _in_class) {
1958 break; // only allow for fields and classes
1959 }
1960 if (!EnableContended || (RestrictContended && !privileged)) {
1961 break; // honor privileges
1962 }
1963 return _jdk_internal_vm_annotation_Contended;
1964 }
1965 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1966 if (_location != _in_method) break; // only allow for methods
1967 if (RestrictReservedStack && !privileged) break; // honor privileges
1968 return _jdk_internal_vm_annotation_ReservedStackAccess;
1969 }
1970 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1971 if (_location != _in_class) break; // only allow for classes
1972 if (!privileged) break; // only allow in privileged code
1973 return _jdk_internal_ValueBased;
1974 }
1975 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
1976 return _java_lang_Deprecated;
1977 }
1978 default: {
1979 break;
1980 }
1981 }
1982 return AnnotationCollector::_unknown;
1983 }
1984
1985 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1986 if (is_contended())
1987 // Setting the contended group also sets the contended bit in field flags
1988 f->set_contended_group(contended_group());
1989 if (is_stable())
1990 (f->field_flags_addr())->update_stable(true);
1991 }
1992
1993 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1994 // If there's an error deallocate metadata for field annotations
1995 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1996 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1997 }
1998
1999 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2000 if (has_annotation(_method_CallerSensitive))
2001 m->set_caller_sensitive();
2002 if (has_annotation(_method_ForceInline))
2003 m->set_force_inline();
2004 if (has_annotation(_method_DontInline))
2005 m->set_dont_inline();
2006 if (has_annotation(_method_ChangesCurrentThread))
2007 m->set_changes_current_thread();
2008 if (has_annotation(_method_JvmtiMountTransition))
2009 m->set_jvmti_mount_transition();
2010 if (has_annotation(_method_InjectedProfile))
2011 m->set_has_injected_profile();
2012 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2013 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2014 if (has_annotation(_method_Hidden))
2015 m->set_is_hidden();
2016 if (has_annotation(_method_Scoped))
2017 m->set_scoped();
2018 if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
2019 m->set_intrinsic_candidate();
2020 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2021 m->set_has_reserved_stack_access();
2022 if (has_annotation(_java_lang_Deprecated))
2023 m->set_deprecated();
2024 if (has_annotation(_java_lang_Deprecated_for_removal))
2025 m->set_deprecated_for_removal();
2026 }
2027
2028 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2029 assert(ik != nullptr, "invariant");
2030 if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
2031 ik->set_is_contended(is_contended());
2032 }
2033 if (has_annotation(_jdk_internal_ValueBased)) {
2034 ik->set_has_value_based_class_annotation();
2035 if (DiagnoseSyncOnValueBasedClasses) {
2036 ik->set_is_value_based();
2037 }
2038 }
2039 if (has_annotation(_java_lang_Deprecated)) {
2040 Array<Method*>* methods = ik->methods();
2041 int length = ik->methods()->length();
2042 for (int i = 0; i < length; i++) {
2043 Method* m = methods->at(i);
2044 m->set_deprecated();
2045 }
2046 }
2047 if (has_annotation(_java_lang_Deprecated_for_removal)) {
2048 Array<Method*>* methods = ik->methods();
2049 int length = ik->methods()->length();
2050 for (int i = 0; i < length; i++) {
2051 Method* m = methods->at(i);
2052 m->set_deprecated_for_removal();
2053 }
2054 }
2055 }
2056
2057 #define MAX_ARGS_SIZE 255
2058 #define MAX_CODE_SIZE 65535
2059 #define INITIAL_MAX_LVT_NUMBER 256
2060
2061 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2062 *
2063 * Rules for LVT's and LVTT's are:
2064 * - There can be any number of LVT's and LVTT's.
2065 * - If there are n LVT's, it is the same as if there was just
2066 * one LVT containing all the entries from the n LVT's.
2067 * - There may be no more than one LVT entry per local variable.
2068 * Two LVT entries are 'equal' if these fields are the same:
2069 * start_pc, length, name, slot
2070 * - There may be no more than one LVTT entry per each LVT entry.
2071 * Each LVTT entry has to match some LVT entry.
2072 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2073 */
2074 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2075 int lvt_cnt,
2076 u2* const localvariable_table_length,
2077 const unsafe_u2** const localvariable_table_start,
2078 int lvtt_cnt,
2079 u2* const localvariable_type_table_length,
2080 const unsafe_u2** const localvariable_type_table_start,
2081 TRAPS) {
2082
2083 ResourceMark rm(THREAD);
2084
2085 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2086 256, AnyObj::RESOURCE_AREA, mtInternal,
2087 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2088
2089 LVT_HashTable* const table = new LVT_HashTable();
2090
2091 // To fill LocalVariableTable in
2092 const Classfile_LVT_Element* cf_lvt;
2093 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2094
2095 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2096 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2097 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2098 copy_lvt_element(&cf_lvt[idx], lvt);
2099 // If no duplicates, add LVT elem in hashtable.
2100 if (table->put(*lvt, lvt) == false
2101 && _need_verify
2102 && _major_version >= JAVA_1_5_VERSION) {
2103 classfile_parse_error("Duplicated LocalVariableTable attribute "
2104 "entry for '%s' in class file %s",
2105 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2106 THREAD);
2107 return;
2108 }
2109 }
2110 }
2111
2112 // To merge LocalVariableTable and LocalVariableTypeTable
2113 const Classfile_LVT_Element* cf_lvtt;
2114 LocalVariableTableElement lvtt_elem;
2115
2116 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2117 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2118 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2119 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2120 LocalVariableTableElement** entry = table->get(lvtt_elem);
2121 if (entry == nullptr) {
2122 if (_need_verify) {
2123 classfile_parse_error("LVTT entry for '%s' in class file %s "
2124 "does not match any LVT entry",
2125 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2126 THREAD);
2127 return;
2128 }
2129 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2130 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2131 "entry for '%s' in class file %s",
2132 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2133 THREAD);
2134 return;
2135 } else {
2136 // to add generic signatures into LocalVariableTable
2137 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2138 }
2139 }
2140 }
2141 }
2142
2143
2144 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2145 const u1* runtime_visible_annotations,
2146 int runtime_visible_annotations_length,
2147 const u1* runtime_visible_parameter_annotations,
2148 int runtime_visible_parameter_annotations_length,
2149 const u1* runtime_visible_type_annotations,
2150 int runtime_visible_type_annotations_length,
2151 const u1* annotation_default,
2152 int annotation_default_length,
2153 TRAPS) {
2154
2155 AnnotationArray* a;
2156
2157 if (runtime_visible_annotations_length > 0) {
2158 a = allocate_annotations(runtime_visible_annotations,
2159 runtime_visible_annotations_length,
2160 CHECK);
2161 cm->set_method_annotations(a);
2162 }
2163
2164 if (runtime_visible_parameter_annotations_length > 0) {
2165 a = allocate_annotations(runtime_visible_parameter_annotations,
2166 runtime_visible_parameter_annotations_length,
2167 CHECK);
2168 cm->set_parameter_annotations(a);
2169 }
2170
2171 if (annotation_default_length > 0) {
2172 a = allocate_annotations(annotation_default,
2173 annotation_default_length,
2174 CHECK);
2175 cm->set_default_annotations(a);
2176 }
2177
2178 if (runtime_visible_type_annotations_length > 0) {
2179 a = allocate_annotations(runtime_visible_type_annotations,
2180 runtime_visible_type_annotations_length,
2181 CHECK);
2182 cm->set_type_annotations(a);
2183 }
2184 }
2185
2186
2187 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2188 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2189 // Method* to save footprint, so we only know the size of the resulting Method* when the
2190 // entire method attribute is parsed.
2191 //
2192 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2193
2194 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2195 bool is_interface,
2196 const ConstantPool* cp,
2197 bool* const has_localvariable_table,
2198 TRAPS) {
2199 assert(cfs != nullptr, "invariant");
2200 assert(cp != nullptr, "invariant");
2201 assert(has_localvariable_table != nullptr, "invariant");
2202
2203 ResourceMark rm(THREAD);
2204 // Parse fixed parts:
2205 // access_flags, name_index, descriptor_index, attributes_count
2206 cfs->guarantee_more(8, CHECK_NULL);
2207
2208 int flags = cfs->get_u2_fast();
2209 const u2 name_index = cfs->get_u2_fast();
2210 const int cp_size = cp->length();
2211 check_property(
2212 valid_symbol_at(name_index),
2213 "Illegal constant pool index %u for method name in class file %s",
2214 name_index, CHECK_NULL);
2215 const Symbol* const name = cp->symbol_at(name_index);
2216 verify_legal_method_name(name, CHECK_NULL);
2217
2218 const u2 signature_index = cfs->get_u2_fast();
2219 guarantee_property(
2220 valid_symbol_at(signature_index),
2221 "Illegal constant pool index %u for method signature in class file %s",
2222 signature_index, CHECK_NULL);
2223 const Symbol* const signature = cp->symbol_at(signature_index);
2224
2225 if (name == vmSymbols::class_initializer_name()) {
2226 // We ignore the other access flags for a valid class initializer.
2227 // (JVM Spec 2nd ed., chapter 4.6)
2228 if (_major_version < 51) { // backward compatibility
2229 flags = JVM_ACC_STATIC;
2230 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2231 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2232 } else {
2233 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2234 return nullptr;
2235 }
2236 } else {
2237 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2238 }
2239
2240 if (name == vmSymbols::object_initializer_name() && is_interface) {
2241 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2242 return nullptr;
2243 }
2244
2245 int args_size = -1; // only used when _need_verify is true
2246 if (_need_verify) {
2247 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2248 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2249 verify_legal_method_signature(name, signature, CHECK_NULL);
2250 if (args_size > MAX_ARGS_SIZE) {
2251 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2252 return nullptr;
2253 }
2254 }
2255
2256 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2257
2258 // Default values for code and exceptions attribute elements
2259 u2 max_stack = 0;
2260 u2 max_locals = 0;
2261 u4 code_length = 0;
2262 const u1* code_start = nullptr;
2263 u2 exception_table_length = 0;
2264 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2265 Array<int>* exception_handlers = Universe::the_empty_int_array();
2266 u2 checked_exceptions_length = 0;
2267 const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2268 CompressedLineNumberWriteStream* linenumber_table = nullptr;
2269 int linenumber_table_length = 0;
2270 int total_lvt_length = 0;
2271 u2 lvt_cnt = 0;
2272 u2 lvtt_cnt = 0;
2273 bool lvt_allocated = false;
2274 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2275 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2276 u2* localvariable_table_length = nullptr;
2277 const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes
2278 u2* localvariable_type_table_length = nullptr;
2279 const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes
2280 int method_parameters_length = -1;
2281 const u1* method_parameters_data = nullptr;
2282 bool method_parameters_seen = false;
2283 bool parsed_code_attribute = false;
2284 bool parsed_checked_exceptions_attribute = false;
2285 bool parsed_stackmap_attribute = false;
2286 // stackmap attribute - JDK1.5
2287 const u1* stackmap_data = nullptr;
2288 int stackmap_data_length = 0;
2289 u2 generic_signature_index = 0;
2290 MethodAnnotationCollector parsed_annotations;
2291 const u1* runtime_visible_annotations = nullptr;
2292 int runtime_visible_annotations_length = 0;
2293 const u1* runtime_visible_parameter_annotations = nullptr;
2294 int runtime_visible_parameter_annotations_length = 0;
2295 const u1* runtime_visible_type_annotations = nullptr;
2296 int runtime_visible_type_annotations_length = 0;
2297 bool runtime_invisible_annotations_exists = false;
2298 bool runtime_invisible_type_annotations_exists = false;
2299 bool runtime_invisible_parameter_annotations_exists = false;
2300 const u1* annotation_default = nullptr;
2301 int annotation_default_length = 0;
2302
2303 // Parse code and exceptions attribute
2304 u2 method_attributes_count = cfs->get_u2_fast();
2305 while (method_attributes_count--) {
2306 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2307 const u2 method_attribute_name_index = cfs->get_u2_fast();
2308 const u4 method_attribute_length = cfs->get_u4_fast();
2309 check_property(
2310 valid_symbol_at(method_attribute_name_index),
2311 "Invalid method attribute name index %u in class file %s",
2312 method_attribute_name_index, CHECK_NULL);
2313
2314 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2315 if (method_attribute_name == vmSymbols::tag_code()) {
2316 // Parse Code attribute
2317 if (_need_verify) {
2318 guarantee_property(
2319 !access_flags.is_native() && !access_flags.is_abstract(),
2320 "Code attribute in native or abstract methods in class file %s",
2321 CHECK_NULL);
2322 }
2323 if (parsed_code_attribute) {
2324 classfile_parse_error("Multiple Code attributes in class file %s",
2325 THREAD);
2326 return nullptr;
2327 }
2328 parsed_code_attribute = true;
2329
2330 // Stack size, locals size, and code size
2331 cfs->guarantee_more(8, CHECK_NULL);
2332 max_stack = cfs->get_u2_fast();
2333 max_locals = cfs->get_u2_fast();
2334 code_length = cfs->get_u4_fast();
2335 if (_need_verify) {
2336 guarantee_property(args_size <= max_locals,
2337 "Arguments can't fit into locals in class file %s",
2338 CHECK_NULL);
2339 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2340 "Invalid method Code length %u in class file %s",
2341 code_length, CHECK_NULL);
2342 }
2343 // Code pointer
2344 code_start = cfs->current();
2345 assert(code_start != nullptr, "null code start");
2346 cfs->guarantee_more(code_length, CHECK_NULL);
2347 cfs->skip_u1_fast(code_length);
2348
2349 // Exception handler table
2350 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2351 exception_table_length = cfs->get_u2_fast();
2352 if (exception_table_length > 0) {
2353 exception_table_start = parse_exception_table(cfs,
2354 code_length,
2355 exception_table_length,
2356 CHECK_NULL);
2357 }
2358
2359 // Parse additional attributes in code attribute
2360 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2361 u2 code_attributes_count = cfs->get_u2_fast();
2362
2363 unsigned int calculated_attribute_length = 0;
2364
2365 calculated_attribute_length =
2366 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2367 calculated_attribute_length += checked_cast<unsigned int>(
2368 code_length +
2369 sizeof(exception_table_length) +
2370 sizeof(code_attributes_count) +
2371 exception_table_length *
2372 ( sizeof(u2) + // start_pc
2373 sizeof(u2) + // end_pc
2374 sizeof(u2) + // handler_pc
2375 sizeof(u2) )); // catch_type_index
2376
2377 while (code_attributes_count--) {
2378 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2379 const u2 code_attribute_name_index = cfs->get_u2_fast();
2380 const u4 code_attribute_length = cfs->get_u4_fast();
2381 calculated_attribute_length += code_attribute_length +
2382 (unsigned)sizeof(code_attribute_name_index) +
2383 (unsigned)sizeof(code_attribute_length);
2384 check_property(valid_symbol_at(code_attribute_name_index),
2385 "Invalid code attribute name index %u in class file %s",
2386 code_attribute_name_index,
2387 CHECK_NULL);
2388 if (LoadLineNumberTables &&
2389 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2390 // Parse and compress line number table
2391 parse_linenumber_table(code_attribute_length,
2392 code_length,
2393 &linenumber_table,
2394 CHECK_NULL);
2395
2396 } else if (LoadLocalVariableTables &&
2397 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2398 // Parse local variable table
2399 if (!lvt_allocated) {
2400 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2401 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2402 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2403 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2404 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2405 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2406 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2407 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2408 lvt_allocated = true;
2409 }
2410 if (lvt_cnt == max_lvt_cnt) {
2411 max_lvt_cnt <<= 1;
2412 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2413 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2414 }
2415 localvariable_table_start[lvt_cnt] =
2416 parse_localvariable_table(cfs,
2417 code_length,
2418 max_locals,
2419 code_attribute_length,
2420 &localvariable_table_length[lvt_cnt],
2421 false, // is not LVTT
2422 CHECK_NULL);
2423 total_lvt_length += localvariable_table_length[lvt_cnt];
2424 lvt_cnt++;
2425 } else if (LoadLocalVariableTypeTables &&
2426 _major_version >= JAVA_1_5_VERSION &&
2427 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2428 if (!lvt_allocated) {
2429 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2430 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2431 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2432 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2433 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2434 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2435 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2436 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2437 lvt_allocated = true;
2438 }
2439 // Parse local variable type table
2440 if (lvtt_cnt == max_lvtt_cnt) {
2441 max_lvtt_cnt <<= 1;
2442 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2443 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2444 }
2445 localvariable_type_table_start[lvtt_cnt] =
2446 parse_localvariable_table(cfs,
2447 code_length,
2448 max_locals,
2449 code_attribute_length,
2450 &localvariable_type_table_length[lvtt_cnt],
2451 true, // is LVTT
2452 CHECK_NULL);
2453 lvtt_cnt++;
2454 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2455 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2456 // Stack map is only needed by the new verifier in JDK1.5.
2457 if (parsed_stackmap_attribute) {
2458 classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
2459 return nullptr;
2460 }
2461 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL);
2462 stackmap_data_length = code_attribute_length;
2463 parsed_stackmap_attribute = true;
2464 } else {
2465 // Skip unknown attributes
2466 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2467 }
2468 }
2469 // check method attribute length
2470 if (_need_verify) {
2471 guarantee_property(method_attribute_length == calculated_attribute_length,
2472 "Code segment has wrong length in class file %s",
2473 CHECK_NULL);
2474 }
2475 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2476 // Parse Exceptions attribute
2477 if (parsed_checked_exceptions_attribute) {
2478 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2479 THREAD);
2480 return nullptr;
2481 }
2482 parsed_checked_exceptions_attribute = true;
2483 checked_exceptions_start =
2484 parse_checked_exceptions(cfs,
2485 &checked_exceptions_length,
2486 method_attribute_length,
2487 CHECK_NULL);
2488 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2489 // reject multiple method parameters
2490 if (method_parameters_seen) {
2491 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2492 THREAD);
2493 return nullptr;
2494 }
2495 method_parameters_seen = true;
2496 method_parameters_length = cfs->get_u1_fast();
2497 const u4 real_length = (method_parameters_length * 4u) + 1u;
2498 if (method_attribute_length != real_length) {
2499 classfile_parse_error(
2500 "Invalid MethodParameters method attribute length %u in class file",
2501 method_attribute_length, THREAD);
2502 return nullptr;
2503 }
2504 method_parameters_data = cfs->current();
2505 cfs->skip_u2_fast(method_parameters_length);
2506 cfs->skip_u2_fast(method_parameters_length);
2507 // ignore this attribute if it cannot be reflected
2508 if (!vmClasses::Parameter_klass_loaded())
2509 method_parameters_length = -1;
2510 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2511 if (method_attribute_length != 0) {
2512 classfile_parse_error(
2513 "Invalid Synthetic method attribute length %u in class file %s",
2514 method_attribute_length, THREAD);
2515 return nullptr;
2516 }
2517 // Should we check that there hasn't already been a synthetic attribute?
2518 access_flags.set_is_synthetic();
2519 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2520 if (method_attribute_length != 0) {
2521 classfile_parse_error(
2522 "Invalid Deprecated method attribute length %u in class file %s",
2523 method_attribute_length, THREAD);
2524 return nullptr;
2525 }
2526 } else if (_major_version >= JAVA_1_5_VERSION) {
2527 if (method_attribute_name == vmSymbols::tag_signature()) {
2528 if (generic_signature_index != 0) {
2529 classfile_parse_error(
2530 "Multiple Signature attributes for method in class file %s",
2531 THREAD);
2532 return nullptr;
2533 }
2534 if (method_attribute_length != 2) {
2535 classfile_parse_error(
2536 "Invalid Signature attribute length %u in class file %s",
2537 method_attribute_length, THREAD);
2538 return nullptr;
2539 }
2540 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2541 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2542 if (runtime_visible_annotations != nullptr) {
2543 classfile_parse_error(
2544 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2545 THREAD);
2546 return nullptr;
2547 }
2548 runtime_visible_annotations_length = method_attribute_length;
2549 runtime_visible_annotations = cfs->current();
2550 assert(runtime_visible_annotations != nullptr, "null visible annotations");
2551 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2552 parse_annotations(cp,
2553 runtime_visible_annotations,
2554 runtime_visible_annotations_length,
2555 &parsed_annotations,
2556 _loader_data,
2557 _can_access_vm_annotations);
2558 cfs->skip_u1_fast(runtime_visible_annotations_length);
2559 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2560 if (runtime_invisible_annotations_exists) {
2561 classfile_parse_error(
2562 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2563 THREAD);
2564 return nullptr;
2565 }
2566 runtime_invisible_annotations_exists = true;
2567 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2568 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2569 if (runtime_visible_parameter_annotations != nullptr) {
2570 classfile_parse_error(
2571 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2572 THREAD);
2573 return nullptr;
2574 }
2575 runtime_visible_parameter_annotations_length = method_attribute_length;
2576 runtime_visible_parameter_annotations = cfs->current();
2577 assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations");
2578 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2579 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2580 if (runtime_invisible_parameter_annotations_exists) {
2581 classfile_parse_error(
2582 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2583 THREAD);
2584 return nullptr;
2585 }
2586 runtime_invisible_parameter_annotations_exists = true;
2587 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2588 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2589 if (annotation_default != nullptr) {
2590 classfile_parse_error(
2591 "Multiple AnnotationDefault attributes for method in class file %s",
2592 THREAD);
2593 return nullptr;
2594 }
2595 annotation_default_length = method_attribute_length;
2596 annotation_default = cfs->current();
2597 assert(annotation_default != nullptr, "null annotation default");
2598 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2599 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2600 if (runtime_visible_type_annotations != nullptr) {
2601 classfile_parse_error(
2602 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2603 THREAD);
2604 return nullptr;
2605 }
2606 runtime_visible_type_annotations_length = method_attribute_length;
2607 runtime_visible_type_annotations = cfs->current();
2608 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
2609 // No need for the VM to parse Type annotations
2610 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2611 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2612 if (runtime_invisible_type_annotations_exists) {
2613 classfile_parse_error(
2614 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2615 THREAD);
2616 return nullptr;
2617 }
2618 runtime_invisible_type_annotations_exists = true;
2619 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2620 } else {
2621 // Skip unknown attributes
2622 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2623 }
2624 } else {
2625 // Skip unknown attributes
2626 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2627 }
2628 }
2629
2630 if (linenumber_table != nullptr) {
2631 linenumber_table->write_terminator();
2632 linenumber_table_length = linenumber_table->position();
2633 }
2634
2635 // Make sure there's at least one Code attribute in non-native/non-abstract method
2636 if (_need_verify) {
2637 guarantee_property(access_flags.is_native() ||
2638 access_flags.is_abstract() ||
2639 parsed_code_attribute,
2640 "Absent Code attribute in method that is not native or abstract in class file %s",
2641 CHECK_NULL);
2642 }
2643
2644 // All sizing information for a Method* is finally available, now create it
2645 InlineTableSizes sizes(
2646 total_lvt_length,
2647 linenumber_table_length,
2648 exception_table_length,
2649 checked_exceptions_length,
2650 method_parameters_length,
2651 generic_signature_index,
2652 runtime_visible_annotations_length,
2653 runtime_visible_parameter_annotations_length,
2654 runtime_visible_type_annotations_length,
2655 annotation_default_length,
2656 0);
2657
2658 Method* const m = Method::allocate(_loader_data,
2659 code_length,
2660 access_flags,
2661 &sizes,
2662 ConstMethod::NORMAL,
2663 _cp->symbol_at(name_index),
2664 CHECK_NULL);
2665
2666 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2667
2668 // Fill in information from fixed part (access_flags already set)
2669 m->set_constants(_cp);
2670 m->set_name_index(name_index);
2671 m->set_signature_index(signature_index);
2672 m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static());
2673 assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2674
2675 // Fill in code attribute information
2676 m->set_max_stack(max_stack);
2677 m->set_max_locals(max_locals);
2678 if (stackmap_data != nullptr) {
2679 m->constMethod()->copy_stackmap_data(_loader_data,
2680 (u1*)stackmap_data,
2681 stackmap_data_length,
2682 CHECK_NULL);
2683 }
2684
2685 // Copy byte codes
2686 m->set_code((u1*)code_start);
2687
2688 // Copy line number table
2689 if (linenumber_table != nullptr) {
2690 memcpy(m->compressed_linenumber_table(),
2691 linenumber_table->buffer(),
2692 linenumber_table_length);
2693 }
2694
2695 // Copy exception table
2696 if (exception_table_length > 0) {
2697 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2698 m->exception_table_start(),
2699 exception_table_length * sizeof(ExceptionTableElement),
2700 sizeof(u2));
2701 }
2702
2703 // Copy method parameters
2704 if (method_parameters_length > 0) {
2705 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2706 for (int i = 0; i < method_parameters_length; i++) {
2707 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2708 method_parameters_data += 2;
2709 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2710 method_parameters_data += 2;
2711 }
2712 }
2713
2714 // Copy checked exceptions
2715 if (checked_exceptions_length > 0) {
2716 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2717 m->checked_exceptions_start(),
2718 checked_exceptions_length * sizeof(CheckedExceptionElement),
2719 sizeof(u2));
2720 }
2721
2722 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2723 if (total_lvt_length > 0) {
2724 *has_localvariable_table = true;
2725 copy_localvariable_table(m->constMethod(),
2726 lvt_cnt,
2727 localvariable_table_length,
2728 localvariable_table_start,
2729 lvtt_cnt,
2730 localvariable_type_table_length,
2731 localvariable_type_table_start,
2732 CHECK_NULL);
2733 }
2734
2735 if (parsed_annotations.has_any_annotations())
2736 parsed_annotations.apply_to(methodHandle(THREAD, m));
2737
2738 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2739 m->set_is_hidden();
2740 }
2741
2742 // Copy annotations
2743 copy_method_annotations(m->constMethod(),
2744 runtime_visible_annotations,
2745 runtime_visible_annotations_length,
2746 runtime_visible_parameter_annotations,
2747 runtime_visible_parameter_annotations_length,
2748 runtime_visible_type_annotations,
2749 runtime_visible_type_annotations_length,
2750 annotation_default,
2751 annotation_default_length,
2752 CHECK_NULL);
2753
2754 if (InstanceKlass::is_finalization_enabled() &&
2755 name == vmSymbols::finalize_method_name() &&
2756 signature == vmSymbols::void_method_signature()) {
2757 if (m->is_empty_method()) {
2758 _has_empty_finalizer = true;
2759 } else {
2760 _has_finalizer = true;
2761 }
2762 }
2763
2764 NOT_PRODUCT(m->verify());
2765 return m;
2766 }
2767
2768
2769 // Side-effects: populates the _methods field in the parser
2770 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2771 bool is_interface,
2772 bool* const has_localvariable_table,
2773 bool* has_final_method,
2774 bool* declares_nonstatic_concrete_methods,
2775 TRAPS) {
2776 assert(cfs != nullptr, "invariant");
2777 assert(has_localvariable_table != nullptr, "invariant");
2778 assert(has_final_method != nullptr, "invariant");
2779 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2780
2781 assert(nullptr == _methods, "invariant");
2782
2783 cfs->guarantee_more(2, CHECK); // length
2784 const u2 length = cfs->get_u2_fast();
2785 if (length == 0) {
2786 _methods = Universe::the_empty_method_array();
2787 } else {
2788 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2789 length,
2790 nullptr,
2791 CHECK);
2792
2793 for (int index = 0; index < length; index++) {
2794 Method* method = parse_method(cfs,
2795 is_interface,
2796 _cp,
2797 has_localvariable_table,
2798 CHECK);
2799
2800 if (method->is_final()) {
2801 *has_final_method = true;
2802 }
2803 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2804 // used for interface initialization, and default method inheritance analysis
2805 if (is_interface && !(*declares_nonstatic_concrete_methods)
2806 && !method->is_abstract() && !method->is_static()) {
2807 *declares_nonstatic_concrete_methods = true;
2808 }
2809 _methods->at_put(index, method);
2810 }
2811
2812 if (_need_verify && length > 1) {
2813 // Check duplicated methods
2814 ResourceMark rm(THREAD);
2815 // Set containing name-signature pairs
2816 NameSigHashtable* names_and_sigs = new NameSigHashtable();
2817 for (int i = 0; i < length; i++) {
2818 const Method* const m = _methods->at(i);
2819 NameSigHash name_and_sig(m->name(), m->signature());
2820 // If no duplicates, add name/signature in hashtable names_and_sigs.
2821 if(!names_and_sigs->put(name_and_sig, 0)) {
2822 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2823 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
2824 return;
2825 }
2826 }
2827 }
2828 }
2829 }
2830
2831 static const intArray* sort_methods(Array<Method*>* methods) {
2832 const int length = methods->length();
2833 // If JVMTI original method ordering or sharing is enabled we have to
2834 // remember the original class file ordering.
2835 // We temporarily use the vtable_index field in the Method* to store the
2836 // class file index, so we can read in after calling qsort.
2837 // Put the method ordering in the shared archive.
2838 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2839 for (int index = 0; index < length; index++) {
2840 Method* const m = methods->at(index);
2841 assert(!m->valid_vtable_index(), "vtable index should not be set");
2842 m->set_vtable_index(index);
2843 }
2844 }
2845 // Sort method array by ascending method name (for faster lookups & vtable construction)
2846 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2847 Method::sort_methods(methods);
2848
2849 intArray* method_ordering = nullptr;
2850 // If JVMTI original method ordering or sharing is enabled construct int
2851 // array remembering the original ordering
2852 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2853 method_ordering = new intArray(length, length, -1);
2854 for (int index = 0; index < length; index++) {
2855 Method* const m = methods->at(index);
2856 const int old_index = m->vtable_index();
2857 assert(old_index >= 0 && old_index < length, "invalid method index");
2858 method_ordering->at_put(index, old_index);
2859 m->set_vtable_index(Method::invalid_vtable_index);
2860 }
2861 }
2862 return method_ordering;
2863 }
2864
2865 // Parse generic_signature attribute for methods and fields
2866 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
2867 TRAPS) {
2868 assert(cfs != nullptr, "invariant");
2869
2870 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2871 const u2 generic_signature_index = cfs->get_u2_fast();
2872 check_property(
2873 valid_symbol_at(generic_signature_index),
2874 "Invalid Signature attribute at constant pool index %u in class file %s",
2875 generic_signature_index, CHECK_0);
2876 return generic_signature_index;
2877 }
2878
2879 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
2880 TRAPS) {
2881
2882 assert(cfs != nullptr, "invariant");
2883
2884 cfs->guarantee_more(2, CHECK); // sourcefile_index
2885 const u2 sourcefile_index = cfs->get_u2_fast();
2886 check_property(
2887 valid_symbol_at(sourcefile_index),
2888 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2889 sourcefile_index, CHECK);
2890 set_class_sourcefile_index(sourcefile_index);
2891 }
2892
2893 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
2894 int length,
2895 TRAPS) {
2896 assert(cfs != nullptr, "invariant");
2897
2898 const u1* const sde_buffer = cfs->current();
2899 assert(sde_buffer != nullptr, "null sde buffer");
2900
2901 // Don't bother storing it if there is no way to retrieve it
2902 if (JvmtiExport::can_get_source_debug_extension()) {
2903 assert((length+1) > length, "Overflow checking");
2904 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2905 for (int i = 0; i < length; i++) {
2906 sde[i] = sde_buffer[i];
2907 }
2908 sde[length] = '\0';
2909 set_class_sde_buffer((const char*)sde, length);
2910 }
2911 // Got utf8 string, set stream position forward
2912 cfs->skip_u1(length, CHECK);
2913 }
2914
2915
2916 // Inner classes can be static, private or protected (classic VM does this)
2917 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
2918 JVM_ACC_PRIVATE | \
2919 JVM_ACC_PROTECTED | \
2920 JVM_ACC_STATIC \
2921 )
2922
2923 // Find index of the InnerClasses entry for the specified inner_class_info_index.
2924 // Return -1 if none is found.
2925 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2926 Symbol* cp_klass_name = cp->klass_name_at(inner);
2927 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2928 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2929 if (cp->klass_name_at(idx_inner) == cp_klass_name) {
2930 return idx;
2931 }
2932 }
2933 return -1;
2934 }
2935
2936 // Return the outer_class_info_index for the InnerClasses entry containing the
2937 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found.
2938 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2939 if (inner == 0) return -1;
2940 int idx = inner_classes_find_index(inner_classes, inner, cp, length);
2941 if (idx == -1) return -1;
2942 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2943 return result;
2944 }
2945
2946 // Return true if circularity is found, false if no circularity is found.
2947 // Use Floyd's cycle finding algorithm.
2948 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
2949 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2950 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2951
2952 while (fast != -1 && fast != 0) {
2953 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
2954 return true; // found a circularity
2955 }
2956 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
2957 if (fast == -1) return false;
2958 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
2959 if (fast == -1) return false;
2960 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
2961 assert(slow != -1, "sanity check");
2962 }
2963 return false;
2964 }
2965
2966 // Loop through each InnerClasses entry checking for circularities and duplications
2967 // with other entries. If duplicate entries are found then throw CFE. Otherwise,
2968 // return true if a circularity or entries with duplicate inner_class_info_indexes
2969 // are found.
2970 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
2971 // Loop through each InnerClasses entry.
2972 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2973 // Return true if there are circular entries.
2974 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
2975 return true;
2976 }
2977 // Check if there are duplicate entries or entries with the same inner_class_info_index.
2978 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
2979 y += InstanceKlass::inner_class_next_offset) {
2980
2981 // 4347400: make sure there's no duplicate entry in the classes array
2982 if (_major_version >= JAVA_1_5_VERSION) {
2983 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
2984 _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
2985 _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
2986 _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
2987 "Duplicate entry in InnerClasses attribute in class file %s",
2988 CHECK_(true));
2989 }
2990 // Return true if there are two entries with the same inner_class_info_index.
2991 if (_inner_classes->at(y) == _inner_classes->at(idx)) {
2992 return true;
2993 }
2994 }
2995 }
2996 return false;
2997 }
2998
2999 // Return number of classes in the inner classes attribute table
3000 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3001 const ConstantPool* cp,
3002 const u1* const inner_classes_attribute_start,
3003 bool parsed_enclosingmethod_attribute,
3004 u2 enclosing_method_class_index,
3005 u2 enclosing_method_method_index,
3006 TRAPS) {
3007 const u1* const current_mark = cfs->current();
3008 u2 length = 0;
3009 if (inner_classes_attribute_start != nullptr) {
3010 cfs->set_current(inner_classes_attribute_start);
3011 cfs->guarantee_more(2, CHECK_0); // length
3012 length = cfs->get_u2_fast();
3013 }
3014
3015 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3016 // method data:
3017 // [inner_class_info_index,
3018 // outer_class_info_index,
3019 // inner_name_index,
3020 // inner_class_access_flags,
3021 // ...
3022 // enclosing_method_class_index,
3023 // enclosing_method_method_index]
3024 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3025 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3026 _inner_classes = inner_classes;
3027
3028 int index = 0;
3029 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3030 for (int n = 0; n < length; n++) {
3031 // Inner class index
3032 const u2 inner_class_info_index = cfs->get_u2_fast();
3033 check_property(
3034 valid_klass_reference_at(inner_class_info_index),
3035 "inner_class_info_index %u has bad constant type in class file %s",
3036 inner_class_info_index, CHECK_0);
3037 // Outer class index
3038 const u2 outer_class_info_index = cfs->get_u2_fast();
3039 check_property(
3040 outer_class_info_index == 0 ||
3041 valid_klass_reference_at(outer_class_info_index),
3042 "outer_class_info_index %u has bad constant type in class file %s",
3043 outer_class_info_index, CHECK_0);
3044
3045 if (outer_class_info_index != 0) {
3046 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3047 char* bytes = (char*)outer_class_name->bytes();
3048 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3049 "Outer class is an array class in class file %s", CHECK_0);
3050 }
3051 // Inner class name
3052 const u2 inner_name_index = cfs->get_u2_fast();
3053 check_property(
3054 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3055 "inner_name_index %u has bad constant type in class file %s",
3056 inner_name_index, CHECK_0);
3057 if (_need_verify) {
3058 guarantee_property(inner_class_info_index != outer_class_info_index,
3059 "Class is both outer and inner class in class file %s", CHECK_0);
3060 }
3061 // Access flags
3062 jint flags;
3063 // JVM_ACC_MODULE is defined in JDK-9 and later.
3064 if (_major_version >= JAVA_9_VERSION) {
3065 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3066 } else {
3067 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3068 }
3069 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3070 // Set abstract bit for old class files for backward compatibility
3071 flags |= JVM_ACC_ABSTRACT;
3072 }
3073 verify_legal_class_modifiers(flags, CHECK_0);
3074 AccessFlags inner_access_flags(flags);
3075
3076 inner_classes->at_put(index++, inner_class_info_index);
3077 inner_classes->at_put(index++, outer_class_info_index);
3078 inner_classes->at_put(index++, inner_name_index);
3079 inner_classes->at_put(index++, inner_access_flags.as_short());
3080 }
3081
3082 // Check for circular and duplicate entries.
3083 bool has_circularity = false;
3084 if (_need_verify) {
3085 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3086 if (has_circularity) {
3087 // If circularity check failed then ignore InnerClasses attribute.
3088 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3089 index = 0;
3090 if (parsed_enclosingmethod_attribute) {
3091 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3092 _inner_classes = inner_classes;
3093 } else {
3094 _inner_classes = Universe::the_empty_short_array();
3095 }
3096 }
3097 }
3098 // Set EnclosingMethod class and method indexes.
3099 if (parsed_enclosingmethod_attribute) {
3100 inner_classes->at_put(index++, enclosing_method_class_index);
3101 inner_classes->at_put(index++, enclosing_method_method_index);
3102 }
3103 assert(index == size || has_circularity, "wrong size");
3104
3105 // Restore buffer's current position.
3106 cfs->set_current(current_mark);
3107
3108 return length;
3109 }
3110
3111 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3112 const u1* const nest_members_attribute_start,
3113 TRAPS) {
3114 const u1* const current_mark = cfs->current();
3115 u2 length = 0;
3116 if (nest_members_attribute_start != nullptr) {
3117 cfs->set_current(nest_members_attribute_start);
3118 cfs->guarantee_more(2, CHECK_0); // length
3119 length = cfs->get_u2_fast();
3120 }
3121 const int size = length;
3122 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3123 _nest_members = nest_members;
3124
3125 int index = 0;
3126 cfs->guarantee_more(2 * length, CHECK_0);
3127 for (int n = 0; n < length; n++) {
3128 const u2 class_info_index = cfs->get_u2_fast();
3129 check_property(
3130 valid_klass_reference_at(class_info_index),
3131 "Nest member class_info_index %u has bad constant type in class file %s",
3132 class_info_index, CHECK_0);
3133 nest_members->at_put(index++, class_info_index);
3134 }
3135 assert(index == size, "wrong size");
3136
3137 // Restore buffer's current position.
3138 cfs->set_current(current_mark);
3139
3140 return length;
3141 }
3142
3143 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3144 const u1* const permitted_subclasses_attribute_start,
3145 TRAPS) {
3146 const u1* const current_mark = cfs->current();
3147 u2 length = 0;
3148 if (permitted_subclasses_attribute_start != nullptr) {
3149 cfs->set_current(permitted_subclasses_attribute_start);
3150 cfs->guarantee_more(2, CHECK_0); // length
3151 length = cfs->get_u2_fast();
3152 }
3153 const int size = length;
3154 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3155 _permitted_subclasses = permitted_subclasses;
3156
3157 if (length > 0) {
3158 int index = 0;
3159 cfs->guarantee_more(2 * length, CHECK_0);
3160 for (int n = 0; n < length; n++) {
3161 const u2 class_info_index = cfs->get_u2_fast();
3162 check_property(
3163 valid_klass_reference_at(class_info_index),
3164 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3165 class_info_index, CHECK_0);
3166 permitted_subclasses->at_put(index++, class_info_index);
3167 }
3168 assert(index == size, "wrong size");
3169 }
3170
3171 // Restore buffer's current position.
3172 cfs->set_current(current_mark);
3173
3174 return length;
3175 }
3176
3177 // Record {
3178 // u2 attribute_name_index;
3179 // u4 attribute_length;
3180 // u2 components_count;
3181 // component_info components[components_count];
3182 // }
3183 // component_info {
3184 // u2 name_index;
3185 // u2 descriptor_index
3186 // u2 attributes_count;
3187 // attribute_info_attributes[attributes_count];
3188 // }
3189 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3190 const ConstantPool* cp,
3191 const u1* const record_attribute_start,
3192 TRAPS) {
3193 const u1* const current_mark = cfs->current();
3194 int components_count = 0;
3195 unsigned int calculate_attr_size = 0;
3196 if (record_attribute_start != nullptr) {
3197 cfs->set_current(record_attribute_start);
3198 cfs->guarantee_more(2, CHECK_0); // num of components
3199 components_count = (int)cfs->get_u2_fast();
3200 calculate_attr_size = 2;
3201 }
3202
3203 Array<RecordComponent*>* const record_components =
3204 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0);
3205 _record_components = record_components;
3206
3207 for (int x = 0; x < components_count; x++) {
3208 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3209
3210 const u2 name_index = cfs->get_u2_fast();
3211 check_property(valid_symbol_at(name_index),
3212 "Invalid constant pool index %u for name in Record attribute in class file %s",
3213 name_index, CHECK_0);
3214 const Symbol* const name = cp->symbol_at(name_index);
3215 verify_legal_field_name(name, CHECK_0);
3216
3217 const u2 descriptor_index = cfs->get_u2_fast();
3218 check_property(valid_symbol_at(descriptor_index),
3219 "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3220 descriptor_index, CHECK_0);
3221 const Symbol* const descr = cp->symbol_at(descriptor_index);
3222 verify_legal_field_signature(name, descr, CHECK_0);
3223
3224 const u2 attributes_count = cfs->get_u2_fast();
3225 calculate_attr_size += 6;
3226 u2 generic_sig_index = 0;
3227 const u1* runtime_visible_annotations = nullptr;
3228 int runtime_visible_annotations_length = 0;
3229 bool runtime_invisible_annotations_exists = false;
3230 const u1* runtime_visible_type_annotations = nullptr;
3231 int runtime_visible_type_annotations_length = 0;
3232 bool runtime_invisible_type_annotations_exists = false;
3233
3234 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3235 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
3236 for (int y = 0; y < attributes_count; y++) {
3237 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
3238 const u2 attribute_name_index = cfs->get_u2_fast();
3239 const u4 attribute_length = cfs->get_u4_fast();
3240 calculate_attr_size += 6;
3241 check_property(
3242 valid_symbol_at(attribute_name_index),
3243 "Invalid Record attribute name index %u in class file %s",
3244 attribute_name_index, CHECK_0);
3245
3246 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3247 if (attribute_name == vmSymbols::tag_signature()) {
3248 if (generic_sig_index != 0) {
3249 classfile_parse_error(
3250 "Multiple Signature attributes for Record component in class file %s",
3251 THREAD);
3252 return 0;
3253 }
3254 if (attribute_length != 2) {
3255 classfile_parse_error(
3256 "Invalid Signature attribute length %u in Record component in class file %s",
3257 attribute_length, THREAD);
3258 return 0;
3259 }
3260 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3261
3262 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3263 if (runtime_visible_annotations != nullptr) {
3264 classfile_parse_error(
3265 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
3266 return 0;
3267 }
3268 runtime_visible_annotations_length = attribute_length;
3269 runtime_visible_annotations = cfs->current();
3270
3271 assert(runtime_visible_annotations != nullptr, "null record component visible annotation");
3272 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3273 cfs->skip_u1_fast(runtime_visible_annotations_length);
3274
3275 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3276 if (runtime_invisible_annotations_exists) {
3277 classfile_parse_error(
3278 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
3279 return 0;
3280 }
3281 runtime_invisible_annotations_exists = true;
3282 cfs->skip_u1(attribute_length, CHECK_0);
3283
3284 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3285 if (runtime_visible_type_annotations != nullptr) {
3286 classfile_parse_error(
3287 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3288 return 0;
3289 }
3290 runtime_visible_type_annotations_length = attribute_length;
3291 runtime_visible_type_annotations = cfs->current();
3292
3293 assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation");
3294 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3295 cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3296
3297 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3298 if (runtime_invisible_type_annotations_exists) {
3299 classfile_parse_error(
3300 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3301 return 0;
3302 }
3303 runtime_invisible_type_annotations_exists = true;
3304 cfs->skip_u1(attribute_length, CHECK_0);
3305
3306 } else {
3307 // Skip unknown attributes
3308 cfs->skip_u1(attribute_length, CHECK_0);
3309 }
3310 calculate_attr_size += attribute_length;
3311 } // End of attributes For loop
3312
3313 AnnotationArray* annotations = allocate_annotations(runtime_visible_annotations,
3314 runtime_visible_annotations_length,
3315 CHECK_0);
3316 AnnotationArray* type_annotations = allocate_annotations(runtime_visible_type_annotations,
3317 runtime_visible_type_annotations_length,
3318 CHECK_0);
3319
3320 RecordComponent* record_component =
3321 RecordComponent::allocate(_loader_data, name_index, descriptor_index, generic_sig_index,
3322 annotations, type_annotations, CHECK_0);
3323 record_components->at_put(x, record_component);
3324 } // End of component processing loop
3325
3326 // Restore buffer's current position.
3327 cfs->set_current(current_mark);
3328 return calculate_attr_size;
3329 }
3330
3331 void ClassFileParser::parse_classfile_synthetic_attribute() {
3332 set_class_synthetic_flag(true);
3333 }
3334
3335 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3336 assert(cfs != nullptr, "invariant");
3337
3338 const u2 signature_index = cfs->get_u2(CHECK);
3339 check_property(
3340 valid_symbol_at(signature_index),
3341 "Invalid constant pool index %u in Signature attribute in class file %s",
3342 signature_index, CHECK);
3343 set_class_generic_signature_index(signature_index);
3344 }
3345
3346 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3347 ConstantPool* cp,
3348 u4 attribute_byte_length,
3349 TRAPS) {
3350 assert(cfs != nullptr, "invariant");
3351 assert(cp != nullptr, "invariant");
3352
3353 const u1* const current_start = cfs->current();
3354
3355 guarantee_property(attribute_byte_length >= sizeof(u2),
3356 "Invalid BootstrapMethods attribute length %u in class file %s",
3357 attribute_byte_length,
3358 CHECK);
3359
3360 cfs->guarantee_more(attribute_byte_length, CHECK);
3361
3362 const int attribute_array_length = cfs->get_u2_fast();
3363
3364 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3365 "Short length on BootstrapMethods in class file %s",
3366 CHECK);
3367
3368
3369 // The attribute contains a counted array of counted tuples of shorts,
3370 // represending bootstrap specifiers:
3371 // length*{bootstrap_method_index, argument_count*{argument_index}}
3372 const unsigned int operand_count = (attribute_byte_length - (unsigned)sizeof(u2)) / (unsigned)sizeof(u2);
3373 // operand_count = number of shorts in attr, except for leading length
3374
3375 // The attribute is copied into a short[] array.
3376 // The array begins with a series of short[2] pairs, one for each tuple.
3377 const int index_size = (attribute_array_length * 2);
3378
3379 Array<u2>* const operands =
3380 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3381
3382 // Eagerly assign operands so they will be deallocated with the constant
3383 // pool if there is an error.
3384 cp->set_operands(operands);
3385
3386 int operand_fill_index = index_size;
3387 const int cp_size = cp->length();
3388
3389 for (int n = 0; n < attribute_array_length; n++) {
3390 // Store a 32-bit offset into the header of the operand array.
3391 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3392
3393 // Read a bootstrap specifier.
3394 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3395 const u2 bootstrap_method_index = cfs->get_u2_fast();
3396 const u2 argument_count = cfs->get_u2_fast();
3397 check_property(
3398 valid_cp_range(bootstrap_method_index, cp_size) &&
3399 cp->tag_at(bootstrap_method_index).is_method_handle(),
3400 "bootstrap_method_index %u has bad constant type in class file %s",
3401 bootstrap_method_index,
3402 CHECK);
3403
3404 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3405 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3406 CHECK);
3407
3408 operands->at_put(operand_fill_index++, bootstrap_method_index);
3409 operands->at_put(operand_fill_index++, argument_count);
3410
3411 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3412 for (int j = 0; j < argument_count; j++) {
3413 const u2 argument_index = cfs->get_u2_fast();
3414 check_property(
3415 valid_cp_range(argument_index, cp_size) &&
3416 cp->tag_at(argument_index).is_loadable_constant(),
3417 "argument_index %u has bad constant type in class file %s",
3418 argument_index,
3419 CHECK);
3420 operands->at_put(operand_fill_index++, argument_index);
3421 }
3422 }
3423 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3424 "Bad length on BootstrapMethods in class file %s",
3425 CHECK);
3426 }
3427
3428 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3429 ConstantPool* cp,
3430 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3431 TRAPS) {
3432 assert(cfs != nullptr, "invariant");
3433 assert(cp != nullptr, "invariant");
3434 assert(parsed_annotations != nullptr, "invariant");
3435
3436 // Set inner classes attribute to default sentinel
3437 _inner_classes = Universe::the_empty_short_array();
3438 // Set nest members attribute to default sentinel
3439 _nest_members = Universe::the_empty_short_array();
3440 // Set _permitted_subclasses attribute to default sentinel
3441 _permitted_subclasses = Universe::the_empty_short_array();
3442 cfs->guarantee_more(2, CHECK); // attributes_count
3443 u2 attributes_count = cfs->get_u2_fast();
3444 bool parsed_sourcefile_attribute = false;
3445 bool parsed_innerclasses_attribute = false;
3446 bool parsed_nest_members_attribute = false;
3447 bool parsed_permitted_subclasses_attribute = false;
3448 bool parsed_nest_host_attribute = false;
3449 bool parsed_record_attribute = false;
3450 bool parsed_enclosingmethod_attribute = false;
3451 bool parsed_bootstrap_methods_attribute = false;
3452 const u1* runtime_visible_annotations = nullptr;
3453 int runtime_visible_annotations_length = 0;
3454 const u1* runtime_visible_type_annotations = nullptr;
3455 int runtime_visible_type_annotations_length = 0;
3456 bool runtime_invisible_type_annotations_exists = false;
3457 bool runtime_invisible_annotations_exists = false;
3458 bool parsed_source_debug_ext_annotations_exist = false;
3459 const u1* inner_classes_attribute_start = nullptr;
3460 u4 inner_classes_attribute_length = 0;
3461 u2 enclosing_method_class_index = 0;
3462 u2 enclosing_method_method_index = 0;
3463 const u1* nest_members_attribute_start = nullptr;
3464 u4 nest_members_attribute_length = 0;
3465 const u1* record_attribute_start = nullptr;
3466 u4 record_attribute_length = 0;
3467 const u1* permitted_subclasses_attribute_start = nullptr;
3468 u4 permitted_subclasses_attribute_length = 0;
3469
3470 // Iterate over attributes
3471 while (attributes_count--) {
3472 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3473 const u2 attribute_name_index = cfs->get_u2_fast();
3474 const u4 attribute_length = cfs->get_u4_fast();
3475 check_property(
3476 valid_symbol_at(attribute_name_index),
3477 "Attribute name has bad constant pool index %u in class file %s",
3478 attribute_name_index, CHECK);
3479 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3480 if (tag == vmSymbols::tag_source_file()) {
3481 // Check for SourceFile tag
3482 if (_need_verify) {
3483 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3484 }
3485 if (parsed_sourcefile_attribute) {
3486 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3487 return;
3488 } else {
3489 parsed_sourcefile_attribute = true;
3490 }
3491 parse_classfile_sourcefile_attribute(cfs, CHECK);
3492 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3493 // Check for SourceDebugExtension tag
3494 if (parsed_source_debug_ext_annotations_exist) {
3495 classfile_parse_error(
3496 "Multiple SourceDebugExtension attributes in class file %s", THREAD);
3497 return;
3498 }
3499 parsed_source_debug_ext_annotations_exist = true;
3500 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3501 } else if (tag == vmSymbols::tag_inner_classes()) {
3502 // Check for InnerClasses tag
3503 if (parsed_innerclasses_attribute) {
3504 classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
3505 return;
3506 } else {
3507 parsed_innerclasses_attribute = true;
3508 }
3509 inner_classes_attribute_start = cfs->current();
3510 inner_classes_attribute_length = attribute_length;
3511 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3512 } else if (tag == vmSymbols::tag_synthetic()) {
3513 // Check for Synthetic tag
3514 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3515 if (attribute_length != 0) {
3516 classfile_parse_error(
3517 "Invalid Synthetic classfile attribute length %u in class file %s",
3518 attribute_length, THREAD);
3519 return;
3520 }
3521 parse_classfile_synthetic_attribute();
3522 } else if (tag == vmSymbols::tag_deprecated()) {
3523 // Check for Deprecated tag - 4276120
3524 if (attribute_length != 0) {
3525 classfile_parse_error(
3526 "Invalid Deprecated classfile attribute length %u in class file %s",
3527 attribute_length, THREAD);
3528 return;
3529 }
3530 } else if (_major_version >= JAVA_1_5_VERSION) {
3531 if (tag == vmSymbols::tag_signature()) {
3532 if (_generic_signature_index != 0) {
3533 classfile_parse_error(
3534 "Multiple Signature attributes in class file %s", THREAD);
3535 return;
3536 }
3537 if (attribute_length != 2) {
3538 classfile_parse_error(
3539 "Wrong Signature attribute length %u in class file %s",
3540 attribute_length, THREAD);
3541 return;
3542 }
3543 parse_classfile_signature_attribute(cfs, CHECK);
3544 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3545 if (runtime_visible_annotations != nullptr) {
3546 classfile_parse_error(
3547 "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
3548 return;
3549 }
3550 runtime_visible_annotations_length = attribute_length;
3551 runtime_visible_annotations = cfs->current();
3552 assert(runtime_visible_annotations != nullptr, "null visible annotations");
3553 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3554 parse_annotations(cp,
3555 runtime_visible_annotations,
3556 runtime_visible_annotations_length,
3557 parsed_annotations,
3558 _loader_data,
3559 _can_access_vm_annotations);
3560 cfs->skip_u1_fast(runtime_visible_annotations_length);
3561 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3562 if (runtime_invisible_annotations_exists) {
3563 classfile_parse_error(
3564 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
3565 return;
3566 }
3567 runtime_invisible_annotations_exists = true;
3568 cfs->skip_u1(attribute_length, CHECK);
3569 } else if (tag == vmSymbols::tag_enclosing_method()) {
3570 if (parsed_enclosingmethod_attribute) {
3571 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
3572 return;
3573 } else {
3574 parsed_enclosingmethod_attribute = true;
3575 }
3576 guarantee_property(attribute_length == 4,
3577 "Wrong EnclosingMethod attribute length %u in class file %s",
3578 attribute_length, CHECK);
3579 cfs->guarantee_more(4, CHECK); // class_index, method_index
3580 enclosing_method_class_index = cfs->get_u2_fast();
3581 enclosing_method_method_index = cfs->get_u2_fast();
3582 if (enclosing_method_class_index == 0) {
3583 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
3584 return;
3585 }
3586 // Validate the constant pool indices and types
3587 check_property(valid_klass_reference_at(enclosing_method_class_index),
3588 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3589 if (enclosing_method_method_index != 0 &&
3590 (!cp->is_within_bounds(enclosing_method_method_index) ||
3591 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3592 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
3593 return;
3594 }
3595 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3596 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3597 if (parsed_bootstrap_methods_attribute) {
3598 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
3599 return;
3600 }
3601 parsed_bootstrap_methods_attribute = true;
3602 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3603 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3604 if (runtime_visible_type_annotations != nullptr) {
3605 classfile_parse_error(
3606 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
3607 return;
3608 }
3609 runtime_visible_type_annotations_length = attribute_length;
3610 runtime_visible_type_annotations = cfs->current();
3611 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
3612 // No need for the VM to parse Type annotations
3613 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3614 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3615 if (runtime_invisible_type_annotations_exists) {
3616 classfile_parse_error(
3617 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
3618 return;
3619 }
3620 runtime_invisible_type_annotations_exists = true;
3621 cfs->skip_u1(attribute_length, CHECK);
3622 } else if (_major_version >= JAVA_11_VERSION) {
3623 if (tag == vmSymbols::tag_nest_members()) {
3624 // Check for NestMembers tag
3625 if (parsed_nest_members_attribute) {
3626 classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
3627 return;
3628 } else {
3629 parsed_nest_members_attribute = true;
3630 }
3631 if (parsed_nest_host_attribute) {
3632 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
3633 return;
3634 }
3635 nest_members_attribute_start = cfs->current();
3636 nest_members_attribute_length = attribute_length;
3637 cfs->skip_u1(nest_members_attribute_length, CHECK);
3638 } else if (tag == vmSymbols::tag_nest_host()) {
3639 if (parsed_nest_host_attribute) {
3640 classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
3641 return;
3642 } else {
3643 parsed_nest_host_attribute = true;
3644 }
3645 if (parsed_nest_members_attribute) {
3646 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
3647 return;
3648 }
3649 if (_need_verify) {
3650 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3651 }
3652 cfs->guarantee_more(2, CHECK);
3653 u2 class_info_index = cfs->get_u2_fast();
3654 check_property(
3655 valid_klass_reference_at(class_info_index),
3656 "Nest-host class_info_index %u has bad constant type in class file %s",
3657 class_info_index, CHECK);
3658 _nest_host = class_info_index;
3659
3660 } else if (_major_version >= JAVA_16_VERSION) {
3661 if (tag == vmSymbols::tag_record()) {
3662 if (parsed_record_attribute) {
3663 classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
3664 return;
3665 }
3666 parsed_record_attribute = true;
3667 record_attribute_start = cfs->current();
3668 record_attribute_length = attribute_length;
3669 } else if (_major_version >= JAVA_17_VERSION) {
3670 if (tag == vmSymbols::tag_permitted_subclasses()) {
3671 if (parsed_permitted_subclasses_attribute) {
3672 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3673 return;
3674 }
3675 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3676 if (_access_flags.is_final()) {
3677 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3678 return;
3679 }
3680 parsed_permitted_subclasses_attribute = true;
3681 permitted_subclasses_attribute_start = cfs->current();
3682 permitted_subclasses_attribute_length = attribute_length;
3683 }
3684 }
3685 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3686 cfs->skip_u1(attribute_length, CHECK);
3687 } else {
3688 // Unknown attribute
3689 cfs->skip_u1(attribute_length, CHECK);
3690 }
3691 } else {
3692 // Unknown attribute
3693 cfs->skip_u1(attribute_length, CHECK);
3694 }
3695 } else {
3696 // Unknown attribute
3697 cfs->skip_u1(attribute_length, CHECK);
3698 }
3699 }
3700 _class_annotations = allocate_annotations(runtime_visible_annotations,
3701 runtime_visible_annotations_length,
3702 CHECK);
3703 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3704 runtime_visible_type_annotations_length,
3705 CHECK);
3706
3707 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3708 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3709 cfs,
3710 cp,
3711 inner_classes_attribute_start,
3712 parsed_innerclasses_attribute,
3713 enclosing_method_class_index,
3714 enclosing_method_method_index,
3715 CHECK);
3716 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3717 guarantee_property(
3718 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3719 "Wrong InnerClasses attribute length in class file %s", CHECK);
3720 }
3721 }
3722
3723 if (parsed_nest_members_attribute) {
3724 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3725 cfs,
3726 nest_members_attribute_start,
3727 CHECK);
3728 if (_need_verify) {
3729 guarantee_property(
3730 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3731 "Wrong NestMembers attribute length in class file %s", CHECK);
3732 }
3733 }
3734
3735 if (parsed_record_attribute) {
3736 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3737 cfs,
3738 cp,
3739 record_attribute_start,
3740 CHECK);
3741 if (_need_verify) {
3742 guarantee_property(record_attribute_length == calculated_attr_length,
3743 "Record attribute has wrong length in class file %s",
3744 CHECK);
3745 }
3746 }
3747
3748 if (parsed_permitted_subclasses_attribute) {
3749 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3750 cfs,
3751 permitted_subclasses_attribute_start,
3752 CHECK);
3753 if (_need_verify) {
3754 guarantee_property(
3755 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3756 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3757 }
3758 }
3759
3760 if (_max_bootstrap_specifier_index >= 0) {
3761 guarantee_property(parsed_bootstrap_methods_attribute,
3762 "Missing BootstrapMethods attribute in class file %s", CHECK);
3763 }
3764 }
3765
3766 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3767 assert(k != nullptr, "invariant");
3768
3769 if (_synthetic_flag)
3770 k->set_is_synthetic();
3771 if (_sourcefile_index != 0) {
3772 k->set_source_file_name_index(_sourcefile_index);
3773 }
3774 if (_generic_signature_index != 0) {
3775 k->set_generic_signature_index(_generic_signature_index);
3776 }
3777 if (_sde_buffer != nullptr) {
3778 k->set_source_debug_extension(_sde_buffer, _sde_length);
3779 }
3780 }
3781
3782 // Create the Annotations object that will
3783 // hold the annotations array for the Klass.
3784 void ClassFileParser::create_combined_annotations(TRAPS) {
3785 if (_class_annotations == nullptr &&
3786 _class_type_annotations == nullptr &&
3787 _fields_annotations == nullptr &&
3788 _fields_type_annotations == nullptr) {
3789 // Don't create the Annotations object unnecessarily.
3790 return;
3791 }
3792
3793 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3794 annotations->set_class_annotations(_class_annotations);
3795 annotations->set_class_type_annotations(_class_type_annotations);
3796 annotations->set_fields_annotations(_fields_annotations);
3797 annotations->set_fields_type_annotations(_fields_type_annotations);
3798
3799 // This is the Annotations object that will be
3800 // assigned to InstanceKlass being constructed.
3801 _combined_annotations = annotations;
3802
3803 // The annotations arrays below has been transferred the
3804 // _combined_annotations so these fields can now be cleared.
3805 _class_annotations = nullptr;
3806 _class_type_annotations = nullptr;
3807 _fields_annotations = nullptr;
3808 _fields_type_annotations = nullptr;
3809 }
3810
3811 // Transfer ownership of metadata allocated to the InstanceKlass.
3812 void ClassFileParser::apply_parsed_class_metadata(
3813 InstanceKlass* this_klass,
3814 int java_fields_count) {
3815 assert(this_klass != nullptr, "invariant");
3816
3817 _cp->set_pool_holder(this_klass);
3818 this_klass->set_constants(_cp);
3819 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3820 this_klass->set_fields_status(_fields_status);
3821 this_klass->set_methods(_methods);
3822 this_klass->set_inner_classes(_inner_classes);
3823 this_klass->set_nest_members(_nest_members);
3824 this_klass->set_nest_host_index(_nest_host);
3825 this_klass->set_annotations(_combined_annotations);
3826 this_klass->set_permitted_subclasses(_permitted_subclasses);
3827 this_klass->set_record_components(_record_components);
3828 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3829 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3830 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3831 // its _super. If an OOM occurs while loading the current klass, its _super field
3832 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3833 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3834 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3835
3836 // Clear out these fields so they don't get deallocated by the destructor
3837 clear_class_metadata();
3838 }
3839
3840 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3841 int anno_length,
3842 TRAPS) {
3843 AnnotationArray* annotations = nullptr;
3844 if (anno != nullptr) {
3845 annotations = MetadataFactory::new_array<u1>(_loader_data,
3846 anno_length,
3847 CHECK_(annotations));
3848 for (int i = 0; i < anno_length; i++) {
3849 annotations->at_put(i, anno[i]);
3850 }
3851 }
3852 return annotations;
3853 }
3854
3855 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3856 const int super_class_index,
3857 const bool need_verify,
3858 TRAPS) {
3859 assert(cp != nullptr, "invariant");
3860 const InstanceKlass* super_klass = nullptr;
3861
3862 if (super_class_index == 0) {
3863 check_property(_class_name == vmSymbols::java_lang_Object(),
3864 "Invalid superclass index %u in class file %s",
3865 super_class_index,
3866 CHECK_NULL);
3867 } else {
3868 check_property(valid_klass_reference_at(super_class_index),
3869 "Invalid superclass index %u in class file %s",
3870 super_class_index,
3871 CHECK_NULL);
3872 // The class name should be legal because it is checked when parsing constant pool.
3873 // However, make sure it is not an array type.
3874 bool is_array = false;
3875 if (cp->tag_at(super_class_index).is_klass()) {
3876 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3877 if (need_verify)
3878 is_array = super_klass->is_array_klass();
3879 } else if (need_verify) {
3880 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3881 }
3882 if (need_verify) {
3883 guarantee_property(!is_array,
3884 "Bad superclass name in class file %s", CHECK_NULL);
3885 }
3886 }
3887 return super_klass;
3888 }
3889
3890 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3891 _max_nonstatic_oop_maps = max_blocks;
3892 _nonstatic_oop_map_count = 0;
3893 if (max_blocks == 0) {
3894 _nonstatic_oop_maps = nullptr;
3895 } else {
3896 _nonstatic_oop_maps =
3897 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
3898 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3899 }
3900 }
3901
3902 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
3903 assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
3904 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
3905 }
3906
3907 // addition of super oop maps
3908 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3909 assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
3910 nof_blocks <= _max_nonstatic_oop_maps, "invariant");
3911
3912 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3913 _nonstatic_oop_map_count += nof_blocks;
3914 }
3915
3916 // collection of oops
3917 void OopMapBlocksBuilder::add(int offset, int count) {
3918 if (_nonstatic_oop_map_count == 0) {
3919 _nonstatic_oop_map_count++;
3920 }
3921 OopMapBlock* nonstatic_oop_map = last_oop_map();
3922 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
3923 nonstatic_oop_map->set_offset(offset);
3924 nonstatic_oop_map->set_count(count);
3925 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
3926 nonstatic_oop_map->increment_count(count);
3927 } else { // Need a new one...
3928 _nonstatic_oop_map_count++;
3929 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
3930 nonstatic_oop_map = last_oop_map();
3931 nonstatic_oop_map->set_offset(offset);
3932 nonstatic_oop_map->set_count(count);
3933 }
3934 }
3935
3936 // general purpose copy, e.g. into allocated instanceKlass
3937 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
3938 if (_nonstatic_oop_map_count != 0) {
3939 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
3940 }
3941 }
3942
3943 // Sort and compact adjacent blocks
3944 void OopMapBlocksBuilder::compact() {
3945 if (_nonstatic_oop_map_count <= 1) {
3946 return;
3947 }
3948 /*
3949 * Since field layout sneaks in oops before values, we will be able to condense
3950 * blocks. There is potential to compact between super, own refs and values
3951 * containing refs.
3952 *
3953 * Currently compaction is slightly limited due to values being 8 byte aligned.
3954 * This may well change: FixMe if it doesn't, the code below is fairly general purpose
3955 * and maybe it doesn't need to be.
3956 */
3957 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
3958 (_sort_Fn)OopMapBlock::compare_offset);
3959 if (_nonstatic_oop_map_count < 2) {
3960 return;
3961 }
3962
3963 // Make a temp copy, and iterate through and copy back into the original
3964 ResourceMark rm;
3965 OopMapBlock* oop_maps_copy =
3966 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
3967 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
3968 copy(oop_maps_copy);
3969 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
3970 unsigned int new_count = 1;
3971 oop_maps_copy++;
3972 while(oop_maps_copy < oop_maps_copy_end) {
3973 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
3974 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
3975 nonstatic_oop_map->increment_count(oop_maps_copy->count());
3976 } else {
3977 nonstatic_oop_map++;
3978 new_count++;
3979 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
3980 nonstatic_oop_map->set_count(oop_maps_copy->count());
3981 }
3982 oop_maps_copy++;
3983 }
3984 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
3985 _nonstatic_oop_map_count = new_count;
3986 }
3987
3988 void OopMapBlocksBuilder::print_on(outputStream* st) const {
3989 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
3990 if (_nonstatic_oop_map_count > 0) {
3991 OopMapBlock* map = _nonstatic_oop_maps;
3992 OopMapBlock* last_map = last_oop_map();
3993 assert(map <= last_map, "Last less than first");
3994 while (map <= last_map) {
3995 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
3996 map->offset() + map->offset_span() - heapOopSize, map->count());
3997 map++;
3998 }
3999 }
4000 }
4001
4002 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4003 print_on(st);
4004 }
4005
4006 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4007 assert(ik != nullptr, "invariant");
4008
4009 const InstanceKlass* const super = ik->java_super();
4010
4011 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4012 // in which case we don't have to register objects as finalizable
4013 if (!_has_empty_finalizer) {
4014 if (_has_finalizer ||
4015 (super != nullptr && super->has_finalizer())) {
4016 ik->set_has_finalizer();
4017 }
4018 }
4019
4020 #ifdef ASSERT
4021 bool f = false;
4022 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4023 vmSymbols::void_method_signature());
4024 if (InstanceKlass::is_finalization_enabled() &&
4025 (m != nullptr) && !m->is_empty_method()) {
4026 f = true;
4027 }
4028
4029 // Spec doesn't prevent agent from redefinition of empty finalizer.
4030 // Despite the fact that it's generally bad idea and redefined finalizer
4031 // will not work as expected we shouldn't abort vm in this case
4032 if (!ik->has_redefined_this_or_super()) {
4033 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4034 }
4035 #endif
4036
4037 // Check if this klass supports the java.lang.Cloneable interface
4038 if (vmClasses::Cloneable_klass_loaded()) {
4039 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4040 ik->set_is_cloneable();
4041 }
4042 }
4043
4044 // If it cannot be fast-path allocated, set a bit in the layout helper.
4045 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4046 assert(ik->size_helper() > 0, "layout_helper is initialized");
4047 if (ik->is_abstract() || ik->is_interface()
4048 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4049 || ik->size_helper() >= FastAllocateSizeLimit) {
4050 // Forbid fast-path allocation.
4051 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4052 ik->set_layout_helper(lh);
4053 }
4054 }
4055
4056 // utility methods for appending an array with check for duplicates
4057
4058 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4059 const Array<InstanceKlass*>* const ifs) {
4060 // iterate over new interfaces
4061 for (int i = 0; i < ifs->length(); i++) {
4062 InstanceKlass* const e = ifs->at(i);
4063 assert(e->is_klass() && e->is_interface(), "just checking");
4064 // add new interface
4065 result->append_if_missing(e);
4066 }
4067 }
4068
4069 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4070 Array<InstanceKlass*>* local_ifs,
4071 ClassLoaderData* loader_data,
4072 TRAPS) {
4073 assert(local_ifs != nullptr, "invariant");
4074 assert(loader_data != nullptr, "invariant");
4075
4076 // Compute maximum size for transitive interfaces
4077 int max_transitive_size = 0;
4078 int super_size = 0;
4079 // Add superclass transitive interfaces size
4080 if (super != nullptr) {
4081 super_size = super->transitive_interfaces()->length();
4082 max_transitive_size += super_size;
4083 }
4084 // Add local interfaces' super interfaces
4085 const int local_size = local_ifs->length();
4086 for (int i = 0; i < local_size; i++) {
4087 InstanceKlass* const l = local_ifs->at(i);
4088 max_transitive_size += l->transitive_interfaces()->length();
4089 }
4090 // Finally add local interfaces
4091 max_transitive_size += local_size;
4092 // Construct array
4093 if (max_transitive_size == 0) {
4094 // no interfaces, use canonicalized array
4095 return Universe::the_empty_instance_klass_array();
4096 } else if (max_transitive_size == super_size) {
4097 // no new local interfaces added, share superklass' transitive interface array
4098 return super->transitive_interfaces();
4099 } else if (max_transitive_size == local_size) {
4100 // only local interfaces added, share local interface array
4101 return local_ifs;
4102 } else {
4103 ResourceMark rm;
4104 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4105
4106 // Copy down from superclass
4107 if (super != nullptr) {
4108 append_interfaces(result, super->transitive_interfaces());
4109 }
4110
4111 // Copy down from local interfaces' superinterfaces
4112 for (int i = 0; i < local_size; i++) {
4113 InstanceKlass* const l = local_ifs->at(i);
4114 append_interfaces(result, l->transitive_interfaces());
4115 }
4116 // Finally add local interfaces
4117 append_interfaces(result, local_ifs);
4118
4119 // length will be less than the max_transitive_size if duplicates were removed
4120 const int length = result->length();
4121 assert(length <= max_transitive_size, "just checking");
4122 Array<InstanceKlass*>* const new_result =
4123 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4124 for (int i = 0; i < length; i++) {
4125 InstanceKlass* const e = result->at(i);
4126 assert(e != nullptr, "just checking");
4127 new_result->at_put(i, e);
4128 }
4129 return new_result;
4130 }
4131 }
4132
4133 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4134 assert(this_klass != nullptr, "invariant");
4135 const Klass* const super = this_klass->super();
4136
4137 if (super != nullptr) {
4138 const InstanceKlass* super_ik = InstanceKlass::cast(super);
4139
4140 if (super->is_final()) {
4141 classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD);
4142 return;
4143 }
4144
4145 if (super_ik->is_sealed() && !super_ik->has_as_permitted_subclass(this_klass)) {
4146 classfile_icce_error("class %s cannot inherit from sealed class %s", super_ik, THREAD);
4147 return;
4148 }
4149
4150 // If the loader is not the boot loader then throw an exception if its
4151 // superclass is in package jdk.internal.reflect and its loader is not a
4152 // special reflection class loader
4153 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4154 PackageEntry* super_package = super->package();
4155 if (super_package != nullptr &&
4156 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4157 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4158 ResourceMark rm(THREAD);
4159 Exceptions::fthrow(
4160 THREAD_AND_LOCATION,
4161 vmSymbols::java_lang_IllegalAccessError(),
4162 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4163 this_klass->external_name(),
4164 this_klass->class_loader_data()->loader_name_and_id(),
4165 super->external_name());
4166 return;
4167 }
4168 }
4169
4170 Reflection::VerifyClassAccessResults vca_result =
4171 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4172 if (vca_result != Reflection::ACCESS_OK) {
4173 ResourceMark rm(THREAD);
4174 char* msg = Reflection::verify_class_access_msg(this_klass,
4175 InstanceKlass::cast(super),
4176 vca_result);
4177 if (msg == nullptr) {
4178 bool same_module = (this_klass->module() == super->module());
4179 Exceptions::fthrow(
4180 THREAD_AND_LOCATION,
4181 vmSymbols::java_lang_IllegalAccessError(),
4182 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4183 this_klass->external_name(),
4184 super->is_abstract() ? "abstract " : "",
4185 super->external_name(),
4186 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4187 (same_module) ? "" : "; ",
4188 (same_module) ? "" : super->class_in_module_of_loader());
4189 } else {
4190 // Add additional message content.
4191 Exceptions::fthrow(
4192 THREAD_AND_LOCATION,
4193 vmSymbols::java_lang_IllegalAccessError(),
4194 "superclass access check failed: %s",
4195 msg);
4196 }
4197 }
4198 }
4199 }
4200
4201
4202 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4203 assert(this_klass != nullptr, "invariant");
4204 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4205 const int lng = local_interfaces->length();
4206 for (int i = lng - 1; i >= 0; i--) {
4207 InstanceKlass* const k = local_interfaces->at(i);
4208 assert (k != nullptr && k->is_interface(), "invalid interface");
4209
4210 if (k->is_sealed() && !k->has_as_permitted_subclass(this_klass)) {
4211 classfile_icce_error(this_klass->is_interface() ?
4212 "class %s cannot extend sealed interface %s" :
4213 "class %s cannot implement sealed interface %s",
4214 k, THREAD);
4215 return;
4216 }
4217
4218 Reflection::VerifyClassAccessResults vca_result =
4219 Reflection::verify_class_access(this_klass, k, false);
4220 if (vca_result != Reflection::ACCESS_OK) {
4221 ResourceMark rm(THREAD);
4222 char* msg = Reflection::verify_class_access_msg(this_klass,
4223 k,
4224 vca_result);
4225 if (msg == nullptr) {
4226 bool same_module = (this_klass->module() == k->module());
4227 Exceptions::fthrow(
4228 THREAD_AND_LOCATION,
4229 vmSymbols::java_lang_IllegalAccessError(),
4230 "class %s cannot access its superinterface %s (%s%s%s)",
4231 this_klass->external_name(),
4232 k->external_name(),
4233 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4234 (same_module) ? "" : "; ",
4235 (same_module) ? "" : k->class_in_module_of_loader());
4236 return;
4237 } else {
4238 // Add additional message content.
4239 Exceptions::fthrow(
4240 THREAD_AND_LOCATION,
4241 vmSymbols::java_lang_IllegalAccessError(),
4242 "superinterface check failed: %s",
4243 msg);
4244 return;
4245 }
4246 }
4247 }
4248 }
4249
4250
4251 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4252 assert(this_klass != nullptr, "invariant");
4253 const Array<Method*>* const methods = this_klass->methods();
4254 const int num_methods = methods->length();
4255
4256 // go thru each method and check if it overrides a final method
4257 for (int index = 0; index < num_methods; index++) {
4258 const Method* const m = methods->at(index);
4259
4260 // skip private, static, and <init> methods
4261 if ((!m->is_private() && !m->is_static()) &&
4262 (m->name() != vmSymbols::object_initializer_name())) {
4263
4264 const Symbol* const name = m->name();
4265 const Symbol* const signature = m->signature();
4266 const InstanceKlass* k = this_klass->java_super();
4267 const Method* super_m = nullptr;
4268 while (k != nullptr) {
4269 // skip supers that don't have final methods.
4270 if (k->has_final_method()) {
4271 // lookup a matching method in the super class hierarchy
4272 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4273 if (super_m == nullptr) {
4274 break; // didn't find any match; get out
4275 }
4276
4277 if (super_m->is_final() && !super_m->is_static() &&
4278 !super_m->access_flags().is_private()) {
4279 // matching method in super is final, and not static or private
4280 bool can_access = Reflection::verify_member_access(this_klass,
4281 super_m->method_holder(),
4282 super_m->method_holder(),
4283 super_m->access_flags(),
4284 false, false, CHECK);
4285 if (can_access) {
4286 // this class can access super final method and therefore override
4287 ResourceMark rm(THREAD);
4288 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
4289 err_msg("class %s overrides final method %s.%s%s",
4290 this_klass->external_name(),
4291 super_m->method_holder()->external_name(),
4292 name->as_C_string(),
4293 signature->as_C_string()));
4294 }
4295 }
4296
4297 // continue to look from super_m's holder's super.
4298 k = super_m->method_holder()->java_super();
4299 continue;
4300 }
4301
4302 k = k->java_super();
4303 }
4304 }
4305 }
4306 }
4307
4308
4309 // assumes that this_klass is an interface
4310 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4311 assert(this_klass != nullptr, "invariant");
4312 assert(this_klass->is_interface(), "not an interface");
4313 const Array<Method*>* methods = this_klass->methods();
4314 const int num_methods = methods->length();
4315
4316 for (int index = 0; index < num_methods; index++) {
4317 const Method* const m = methods->at(index);
4318 // if m is static and not the init method, throw a verify error
4319 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4320 ResourceMark rm(THREAD);
4321 Exceptions::fthrow(
4322 THREAD_AND_LOCATION,
4323 vmSymbols::java_lang_VerifyError(),
4324 "Illegal static method %s in interface %s",
4325 m->name()->as_C_string(),
4326 this_klass->external_name()
4327 );
4328 return;
4329 }
4330 }
4331 }
4332
4333 // utility methods for format checking
4334
4335 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4336 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4337 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4338 if (is_module) {
4339 ResourceMark rm(THREAD);
4340 Exceptions::fthrow(
4341 THREAD_AND_LOCATION,
4342 vmSymbols::java_lang_NoClassDefFoundError(),
4343 "%s is not a class because access_flag ACC_MODULE is set",
4344 _class_name->as_C_string());
4345 return;
4346 }
4347
4348 if (!_need_verify) { return; }
4349
4350 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4351 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4352 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4353 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4354 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4355 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4356 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4357
4358 if ((is_abstract && is_final) ||
4359 (is_interface && !is_abstract) ||
4360 (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
4361 (!is_interface && major_gte_1_5 && is_annotation)) {
4362 ResourceMark rm(THREAD);
4363 Exceptions::fthrow(
4364 THREAD_AND_LOCATION,
4365 vmSymbols::java_lang_ClassFormatError(),
4366 "Illegal class modifiers in class %s: 0x%X",
4367 _class_name->as_C_string(), flags
4368 );
4369 return;
4370 }
4371 }
4372
4373 static bool has_illegal_visibility(jint flags) {
4374 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4375 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4376 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4377
4378 return ((is_public && is_protected) ||
4379 (is_public && is_private) ||
4380 (is_protected && is_private));
4381 }
4382
4383 // A legal major_version.minor_version must be one of the following:
4384 //
4385 // Major_version >= 45 and major_version < 56, any minor_version.
4386 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4387 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4388 //
4389 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4390 ResourceMark rm(THREAD);
4391 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4392 if (major < JAVA_MIN_SUPPORTED_VERSION) {
4393 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
4394 class_name, major, minor, THREAD);
4395 return;
4396 }
4397
4398 if (major > max_version) {
4399 Exceptions::fthrow(
4400 THREAD_AND_LOCATION,
4401 vmSymbols::java_lang_UnsupportedClassVersionError(),
4402 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4403 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4404 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4405 return;
4406 }
4407
4408 if (major < JAVA_12_VERSION || minor == 0) {
4409 return;
4410 }
4411
4412 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4413 if (major != max_version) {
4414 Exceptions::fthrow(
4415 THREAD_AND_LOCATION,
4416 vmSymbols::java_lang_UnsupportedClassVersionError(),
4417 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4418 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4419 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4420 return;
4421 }
4422
4423 if (!Arguments::enable_preview()) {
4424 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4425 class_name, major, minor, THREAD);
4426 return;
4427 }
4428
4429 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4430 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4431 class_name, major, minor, THREAD);
4432 }
4433 }
4434
4435 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4436 bool is_interface,
4437 TRAPS) const {
4438 if (!_need_verify) { return; }
4439
4440 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4441 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4442 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4443 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4444 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4445 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4446 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4447 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4448 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4449
4450 bool is_illegal = false;
4451
4452 if (is_interface) {
4453 if (!is_public || !is_static || !is_final || is_private ||
4454 is_protected || is_volatile || is_transient ||
4455 (major_gte_1_5 && is_enum)) {
4456 is_illegal = true;
4457 }
4458 } else { // not interface
4459 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4460 is_illegal = true;
4461 }
4462 }
4463
4464 if (is_illegal) {
4465 ResourceMark rm(THREAD);
4466 Exceptions::fthrow(
4467 THREAD_AND_LOCATION,
4468 vmSymbols::java_lang_ClassFormatError(),
4469 "Illegal field modifiers in class %s: 0x%X",
4470 _class_name->as_C_string(), flags);
4471 return;
4472 }
4473 }
4474
4475 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4476 bool is_interface,
4477 const Symbol* name,
4478 TRAPS) const {
4479 if (!_need_verify) { return; }
4480
4481 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4482 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4483 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4484 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4485 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4486 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4487 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4488 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4489 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4490 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4491 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4492 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4493 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4494 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4495
4496 bool is_illegal = false;
4497
4498 if (is_interface) {
4499 if (major_gte_8) {
4500 // Class file version is JAVA_8_VERSION or later Methods of
4501 // interfaces may set any of the flags except ACC_PROTECTED,
4502 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4503 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4504 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4505 (is_native || is_protected || is_final || is_synchronized) ||
4506 // If a specific method of a class or interface has its
4507 // ACC_ABSTRACT flag set, it must not have any of its
4508 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4509 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4510 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4511 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4512 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4513 is_illegal = true;
4514 }
4515 } else if (major_gte_1_5) {
4516 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4517 if (!is_public || is_private || is_protected || is_static || is_final ||
4518 is_synchronized || is_native || !is_abstract || is_strict) {
4519 is_illegal = true;
4520 }
4521 } else {
4522 // Class file version is pre-JAVA_1_5_VERSION
4523 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4524 is_illegal = true;
4525 }
4526 }
4527 } else { // not interface
4528 if (has_illegal_visibility(flags)) {
4529 is_illegal = true;
4530 } else {
4531 if (is_initializer) {
4532 if (is_static || is_final || is_synchronized || is_native ||
4533 is_abstract || (major_gte_1_5 && is_bridge)) {
4534 is_illegal = true;
4535 }
4536 } else { // not initializer
4537 if (is_abstract) {
4538 if ((is_final || is_native || is_private || is_static ||
4539 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4540 is_illegal = true;
4541 }
4542 }
4543 }
4544 }
4545 }
4546
4547 if (is_illegal) {
4548 ResourceMark rm(THREAD);
4549 Exceptions::fthrow(
4550 THREAD_AND_LOCATION,
4551 vmSymbols::java_lang_ClassFormatError(),
4552 "Method %s in class %s has illegal modifiers: 0x%X",
4553 name->as_C_string(), _class_name->as_C_string(), flags);
4554 return;
4555 }
4556 }
4557
4558 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4559 int length,
4560 TRAPS) const {
4561 assert(_need_verify, "only called when _need_verify is true");
4562 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4563 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4564 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4565 }
4566 }
4567
4568 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4569 // In class names, '/' separates unqualified names. This is verified in this function also.
4570 // Method names also may not contain the characters '<' or '>', unless <init>
4571 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4572 // method. Because these names have been checked as special cases before
4573 // calling this method in verify_legal_method_name.
4574 //
4575 // This method is also called from the modular system APIs in modules.cpp
4576 // to verify the validity of module and package names.
4577 bool ClassFileParser::verify_unqualified_name(const char* name,
4578 unsigned int length,
4579 int type) {
4580 if (length == 0) return false; // Must have at least one char.
4581 for (const char* p = name; p != name + length; p++) {
4582 switch(*p) {
4583 case JVM_SIGNATURE_DOT:
4584 case JVM_SIGNATURE_ENDCLASS:
4585 case JVM_SIGNATURE_ARRAY:
4586 // do not permit '.', ';', or '['
4587 return false;
4588 case JVM_SIGNATURE_SLASH:
4589 // check for '//' or leading or trailing '/' which are not legal
4590 // unqualified name must not be empty
4591 if (type == ClassFileParser::LegalClass) {
4592 if (p == name || p+1 >= name+length ||
4593 *(p+1) == JVM_SIGNATURE_SLASH) {
4594 return false;
4595 }
4596 } else {
4597 return false; // do not permit '/' unless it's class name
4598 }
4599 break;
4600 case JVM_SIGNATURE_SPECIAL:
4601 case JVM_SIGNATURE_ENDSPECIAL:
4602 // do not permit '<' or '>' in method names
4603 if (type == ClassFileParser::LegalMethod) {
4604 return false;
4605 }
4606 }
4607 }
4608 return true;
4609 }
4610
4611 // Take pointer to a UTF8 byte string (not NUL-terminated).
4612 // Skip over the longest part of the string that could
4613 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4614 // Return a pointer to just past the fieldname.
4615 // Return null if no fieldname at all was found, or in the case of slash_ok
4616 // being true, we saw consecutive slashes (meaning we were looking for a
4617 // qualified path but found something that was badly-formed).
4618 static const char* skip_over_field_name(const char* const name,
4619 bool slash_ok,
4620 unsigned int length) {
4621 const char* p;
4622 jboolean last_is_slash = false;
4623 jboolean not_first_ch = false;
4624
4625 for (p = name; p != name + length; not_first_ch = true) {
4626 const char* old_p = p;
4627 jchar ch = *p;
4628 if (ch < 128) {
4629 p++;
4630 // quick check for ascii
4631 if ((ch >= 'a' && ch <= 'z') ||
4632 (ch >= 'A' && ch <= 'Z') ||
4633 (ch == '_' || ch == '$') ||
4634 (not_first_ch && ch >= '0' && ch <= '9')) {
4635 last_is_slash = false;
4636 continue;
4637 }
4638 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
4639 if (last_is_slash) {
4640 return nullptr; // Don't permit consecutive slashes
4641 }
4642 last_is_slash = true;
4643 continue;
4644 }
4645 }
4646 else {
4647 jint unicode_ch;
4648 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4649 p = tmp_p;
4650 last_is_slash = false;
4651 // Check if ch is Java identifier start or is Java identifier part
4652 // 4672820: call java.lang.Character methods directly without generating separate tables.
4653 EXCEPTION_MARK;
4654 // return value
4655 JavaValue result(T_BOOLEAN);
4656 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
4657 JavaCallArguments args;
4658 args.push_int(unicode_ch);
4659
4660 if (not_first_ch) {
4661 // public static boolean isJavaIdentifierPart(char ch);
4662 JavaCalls::call_static(&result,
4663 vmClasses::Character_klass(),
4664 vmSymbols::isJavaIdentifierPart_name(),
4665 vmSymbols::int_bool_signature(),
4666 &args,
4667 THREAD);
4668 } else {
4669 // public static boolean isJavaIdentifierStart(char ch);
4670 JavaCalls::call_static(&result,
4671 vmClasses::Character_klass(),
4672 vmSymbols::isJavaIdentifierStart_name(),
4673 vmSymbols::int_bool_signature(),
4674 &args,
4675 THREAD);
4676 }
4677 if (HAS_PENDING_EXCEPTION) {
4678 CLEAR_PENDING_EXCEPTION;
4679 return nullptr;
4680 }
4681 if(result.get_jboolean()) {
4682 continue;
4683 }
4684 }
4685 return (not_first_ch) ? old_p : nullptr;
4686 }
4687 return (not_first_ch && !last_is_slash) ? p : nullptr;
4688 }
4689
4690 // Take pointer to a UTF8 byte string (not NUL-terminated).
4691 // Skip over the longest part of the string that could
4692 // be taken as a field signature. Allow "void" if void_ok.
4693 // Return a pointer to just past the signature.
4694 // Return null if no legal signature is found.
4695 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4696 bool void_ok,
4697 unsigned int length,
4698 TRAPS) const {
4699 unsigned int array_dim = 0;
4700 while (length > 0) {
4701 switch (signature[0]) {
4702 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4703 case JVM_SIGNATURE_BOOLEAN:
4704 case JVM_SIGNATURE_BYTE:
4705 case JVM_SIGNATURE_CHAR:
4706 case JVM_SIGNATURE_SHORT:
4707 case JVM_SIGNATURE_INT:
4708 case JVM_SIGNATURE_FLOAT:
4709 case JVM_SIGNATURE_LONG:
4710 case JVM_SIGNATURE_DOUBLE:
4711 return signature + 1;
4712 case JVM_SIGNATURE_CLASS: {
4713 if (_major_version < JAVA_1_5_VERSION) {
4714 // Skip over the class name if one is there
4715 const char* const p = skip_over_field_name(signature + 1, true, --length);
4716
4717 // The next character better be a semicolon
4718 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
4719 return p + 1;
4720 }
4721 }
4722 else {
4723 // Skip leading 'L' and ignore first appearance of ';'
4724 signature++;
4725 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4726 // Format check signature
4727 if (c != nullptr) {
4728 int newlen = pointer_delta_as_int(c, (char*) signature);
4729 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4730 if (!legal) {
4731 classfile_parse_error("Class name is empty or contains illegal character "
4732 "in descriptor in class file %s",
4733 THREAD);
4734 return nullptr;
4735 }
4736 return signature + newlen + 1;
4737 }
4738 }
4739 return nullptr;
4740 }
4741 case JVM_SIGNATURE_ARRAY:
4742 array_dim++;
4743 if (array_dim > 255) {
4744 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4745 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
4746 return nullptr;
4747 }
4748 // The rest of what's there better be a legal signature
4749 signature++;
4750 length--;
4751 void_ok = false;
4752 break;
4753 default:
4754 return nullptr;
4755 }
4756 }
4757 return nullptr;
4758 }
4759
4760 // Checks if name is a legal class name.
4761 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4762 if (!_need_verify || _relax_verify) { return; }
4763
4764 assert(name->refcount() > 0, "symbol must be kept alive");
4765 char* bytes = (char*)name->bytes();
4766 unsigned int length = name->utf8_length();
4767 bool legal = false;
4768
4769 if (length > 0) {
4770 const char* p;
4771 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4772 p = skip_over_field_signature(bytes, false, length, CHECK);
4773 legal = (p != nullptr) && ((p - bytes) == (int)length);
4774 } else if (_major_version < JAVA_1_5_VERSION) {
4775 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4776 p = skip_over_field_name(bytes, true, length);
4777 legal = (p != nullptr) && ((p - bytes) == (int)length);
4778 }
4779 } else {
4780 // 4900761: relax the constraints based on JSR202 spec
4781 // Class names may be drawn from the entire Unicode character set.
4782 // Identifiers between '/' must be unqualified names.
4783 // The utf8 string has been verified when parsing cpool entries.
4784 legal = verify_unqualified_name(bytes, length, LegalClass);
4785 }
4786 }
4787 if (!legal) {
4788 ResourceMark rm(THREAD);
4789 assert(_class_name != nullptr, "invariant");
4790 Exceptions::fthrow(
4791 THREAD_AND_LOCATION,
4792 vmSymbols::java_lang_ClassFormatError(),
4793 "Illegal class name \"%.*s\" in class file %s", length, bytes,
4794 _class_name->as_C_string()
4795 );
4796 return;
4797 }
4798 }
4799
4800 // Checks if name is a legal field name.
4801 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
4802 if (!_need_verify || _relax_verify) { return; }
4803
4804 char* bytes = (char*)name->bytes();
4805 unsigned int length = name->utf8_length();
4806 bool legal = false;
4807
4808 if (length > 0) {
4809 if (_major_version < JAVA_1_5_VERSION) {
4810 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4811 const char* p = skip_over_field_name(bytes, false, length);
4812 legal = (p != nullptr) && ((p - bytes) == (int)length);
4813 }
4814 } else {
4815 // 4881221: relax the constraints based on JSR202 spec
4816 legal = verify_unqualified_name(bytes, length, LegalField);
4817 }
4818 }
4819
4820 if (!legal) {
4821 ResourceMark rm(THREAD);
4822 assert(_class_name != nullptr, "invariant");
4823 Exceptions::fthrow(
4824 THREAD_AND_LOCATION,
4825 vmSymbols::java_lang_ClassFormatError(),
4826 "Illegal field name \"%.*s\" in class %s", length, bytes,
4827 _class_name->as_C_string()
4828 );
4829 return;
4830 }
4831 }
4832
4833 // Checks if name is a legal method name.
4834 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
4835 if (!_need_verify || _relax_verify) { return; }
4836
4837 assert(name != nullptr, "method name is null");
4838 char* bytes = (char*)name->bytes();
4839 unsigned int length = name->utf8_length();
4840 bool legal = false;
4841
4842 if (length > 0) {
4843 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
4844 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4845 legal = true;
4846 }
4847 } else if (_major_version < JAVA_1_5_VERSION) {
4848 const char* p;
4849 p = skip_over_field_name(bytes, false, length);
4850 legal = (p != nullptr) && ((p - bytes) == (int)length);
4851 } else {
4852 // 4881221: relax the constraints based on JSR202 spec
4853 legal = verify_unqualified_name(bytes, length, LegalMethod);
4854 }
4855 }
4856
4857 if (!legal) {
4858 ResourceMark rm(THREAD);
4859 assert(_class_name != nullptr, "invariant");
4860 Exceptions::fthrow(
4861 THREAD_AND_LOCATION,
4862 vmSymbols::java_lang_ClassFormatError(),
4863 "Illegal method name \"%.*s\" in class %s", length, bytes,
4864 _class_name->as_C_string()
4865 );
4866 return;
4867 }
4868 }
4869
4870
4871 // Checks if signature is a legal field signature.
4872 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
4873 const Symbol* signature,
4874 TRAPS) const {
4875 if (!_need_verify) { return; }
4876
4877 const char* const bytes = (const char*)signature->bytes();
4878 const unsigned int length = signature->utf8_length();
4879 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
4880
4881 if (p == nullptr || (p - bytes) != (int)length) {
4882 throwIllegalSignature("Field", name, signature, CHECK);
4883 }
4884 }
4885
4886 // Check that the signature is compatible with the method name. For example,
4887 // check that <init> has a void signature.
4888 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
4889 const Symbol* signature,
4890 TRAPS) const {
4891 if (!_need_verify) {
4892 return;
4893 }
4894
4895 // Class initializers cannot have args for class format version >= 51.
4896 if (name == vmSymbols::class_initializer_name() &&
4897 signature != vmSymbols::void_method_signature() &&
4898 _major_version >= JAVA_7_VERSION) {
4899 throwIllegalSignature("Method", name, signature, THREAD);
4900 return;
4901 }
4902
4903 int sig_length = signature->utf8_length();
4904 if (name->utf8_length() > 0 &&
4905 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
4906 sig_length > 0 &&
4907 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
4908 throwIllegalSignature("Method", name, signature, THREAD);
4909 }
4910 }
4911
4912 // Checks if signature is a legal method signature.
4913 // Returns number of parameters
4914 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
4915 const Symbol* signature,
4916 TRAPS) const {
4917 if (!_need_verify) {
4918 // make sure caller's args_size will be less than 0 even for non-static
4919 // method so it will be recomputed in compute_size_of_parameters().
4920 return -2;
4921 }
4922
4923 unsigned int args_size = 0;
4924 const char* p = (const char*)signature->bytes();
4925 unsigned int length = signature->utf8_length();
4926 const char* nextp;
4927
4928 // The first character must be a '('
4929 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4930 length--;
4931 // Skip over legal field signatures
4932 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4933 while ((length > 0) && (nextp != nullptr)) {
4934 args_size++;
4935 if (p[0] == 'J' || p[0] == 'D') {
4936 args_size++;
4937 }
4938 length -= pointer_delta_as_int(nextp, p);
4939 p = nextp;
4940 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4941 }
4942 // The first non-signature thing better be a ')'
4943 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4944 length--;
4945 // Now we better just have a return value
4946 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4947 if (nextp && ((int)length == (nextp - p))) {
4948 return args_size;
4949 }
4950 }
4951 }
4952 // Report error
4953 throwIllegalSignature("Method", name, signature, THREAD);
4954 return 0;
4955 }
4956
4957 int ClassFileParser::static_field_size() const {
4958 assert(_field_info != nullptr, "invariant");
4959 return _field_info->_static_field_size;
4960 }
4961
4962 int ClassFileParser::total_oop_map_count() const {
4963 assert(_field_info != nullptr, "invariant");
4964 return _field_info->oop_map_blocks->_nonstatic_oop_map_count;
4965 }
4966
4967 jint ClassFileParser::layout_size() const {
4968 assert(_field_info != nullptr, "invariant");
4969 return _field_info->_instance_size;
4970 }
4971
4972 static void check_methods_for_intrinsics(const InstanceKlass* ik,
4973 const Array<Method*>* methods) {
4974 assert(ik != nullptr, "invariant");
4975 assert(methods != nullptr, "invariant");
4976
4977 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4978 // (We used to do this lazily, but now we query it in Rewriter,
4979 // which is eagerly done for every method, so we might as well do it now,
4980 // when everything is fresh in memory.)
4981 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
4982
4983 if (klass_id != vmSymbolID::NO_SID) {
4984 for (int j = 0; j < methods->length(); ++j) {
4985 Method* method = methods->at(j);
4986 method->init_intrinsic_id(klass_id);
4987
4988 if (CheckIntrinsics) {
4989 // Check if an intrinsic is defined for method 'method',
4990 // but the method is not annotated with @IntrinsicCandidate.
4991 if (method->intrinsic_id() != vmIntrinsics::_none &&
4992 !method->intrinsic_candidate()) {
4993 tty->print("Compiler intrinsic is defined for method [%s], "
4994 "but the method is not annotated with @IntrinsicCandidate.%s",
4995 method->name_and_sig_as_C_string(),
4996 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
4997 );
4998 tty->cr();
4999 DEBUG_ONLY(vm_exit(1));
5000 }
5001 // Check is the method 'method' is annotated with @IntrinsicCandidate,
5002 // but there is no intrinsic available for it.
5003 if (method->intrinsic_candidate() &&
5004 method->intrinsic_id() == vmIntrinsics::_none) {
5005 tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
5006 "but no compiler intrinsic is defined for the method.%s",
5007 method->name_and_sig_as_C_string(),
5008 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5009 );
5010 tty->cr();
5011 DEBUG_ONLY(vm_exit(1));
5012 }
5013 }
5014 } // end for
5015
5016 #ifdef ASSERT
5017 if (CheckIntrinsics) {
5018 // Check for orphan methods in the current class. A method m
5019 // of a class C is orphan if an intrinsic is defined for method m,
5020 // but class C does not declare m.
5021 // The check is potentially expensive, therefore it is available
5022 // only in debug builds.
5023
5024 for (auto id : EnumRange<vmIntrinsicID>{}) {
5025 if (vmIntrinsics::_compiledLambdaForm == id) {
5026 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5027 // generated for the JVM from a LambdaForm and therefore no method
5028 // is defined for it.
5029 continue;
5030 }
5031 if (vmIntrinsics::_blackhole == id) {
5032 // The _blackhole intrinsic is a special marker. No explicit method
5033 // is defined for it.
5034 continue;
5035 }
5036
5037 if (vmIntrinsics::class_for(id) == klass_id) {
5038 // Check if the current class contains a method with the same
5039 // name, flags, signature.
5040 bool match = false;
5041 for (int j = 0; j < methods->length(); ++j) {
5042 const Method* method = methods->at(j);
5043 if (method->intrinsic_id() == id) {
5044 match = true;
5045 break;
5046 }
5047 }
5048
5049 if (!match) {
5050 char buf[1000];
5051 tty->print("Compiler intrinsic is defined for method [%s], "
5052 "but the method is not available in class [%s].%s",
5053 vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
5054 ik->name()->as_C_string(),
5055 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5056 );
5057 tty->cr();
5058 DEBUG_ONLY(vm_exit(1));
5059 }
5060 }
5061 } // end for
5062 } // CheckIntrinsics
5063 #endif // ASSERT
5064 }
5065 }
5066
5067 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5068 const ClassInstanceInfo& cl_inst_info,
5069 TRAPS) {
5070 if (_klass != nullptr) {
5071 return _klass;
5072 }
5073
5074 InstanceKlass* const ik =
5075 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5076
5077 if (is_hidden()) {
5078 mangle_hidden_class_name(ik);
5079 }
5080
5081 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5082
5083 assert(_klass == ik, "invariant");
5084
5085 return ik;
5086 }
5087
5088 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5089 bool changed_by_loadhook,
5090 const ClassInstanceInfo& cl_inst_info,
5091 TRAPS) {
5092 assert(ik != nullptr, "invariant");
5093
5094 // Set name and CLD before adding to CLD
5095 ik->set_class_loader_data(_loader_data);
5096 ik->set_name(_class_name);
5097
5098 // Add all classes to our internal class loader list here,
5099 // including classes in the bootstrap (null) class loader.
5100 const bool publicize = !is_internal();
5101
5102 _loader_data->add_class(ik, publicize);
5103
5104 set_klass_to_deallocate(ik);
5105
5106 assert(_field_info != nullptr, "invariant");
5107 assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5108 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5109 "sanity");
5110
5111 assert(ik->is_instance_klass(), "sanity");
5112 assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5113
5114 // Fill in information already parsed
5115 ik->set_should_verify_class(_need_verify);
5116
5117 // Not yet: supers are done below to support the new subtype-checking fields
5118 ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5119 ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5120 assert(_fac != nullptr, "invariant");
5121 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5122
5123 // this transfers ownership of a lot of arrays from
5124 // the parser onto the InstanceKlass*
5125 apply_parsed_class_metadata(ik, _java_fields_count);
5126
5127 // can only set dynamic nest-host after static nest information is set
5128 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5129 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5130 }
5131
5132 // note that is not safe to use the fields in the parser from this point on
5133 assert(nullptr == _cp, "invariant");
5134 assert(nullptr == _fieldinfo_stream, "invariant");
5135 assert(nullptr == _fields_status, "invariant");
5136 assert(nullptr == _methods, "invariant");
5137 assert(nullptr == _inner_classes, "invariant");
5138 assert(nullptr == _nest_members, "invariant");
5139 assert(nullptr == _combined_annotations, "invariant");
5140 assert(nullptr == _record_components, "invariant");
5141 assert(nullptr == _permitted_subclasses, "invariant");
5142
5143 if (_has_localvariable_table) {
5144 ik->set_has_localvariable_table(true);
5145 }
5146
5147 if (_has_final_method) {
5148 ik->set_has_final_method();
5149 }
5150
5151 ik->copy_method_ordering(_method_ordering, CHECK);
5152 // The InstanceKlass::_methods_jmethod_ids cache
5153 // is managed on the assumption that the initial cache
5154 // size is equal to the number of methods in the class. If
5155 // that changes, then InstanceKlass::idnum_can_increment()
5156 // has to be changed accordingly.
5157 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5158
5159 ik->set_this_class_index(_this_class_index);
5160
5161 if (_is_hidden) {
5162 // _this_class_index is a CONSTANT_Class entry that refers to this
5163 // hidden class itself. If this class needs to refer to its own methods
5164 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5165 // _this_class_index. However, because this class is hidden (it's
5166 // not stored in SystemDictionary), _this_class_index cannot be resolved
5167 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5168 // Therefore, we must eagerly resolve _this_class_index now.
5169 ik->constants()->klass_at_put(_this_class_index, ik);
5170 }
5171
5172 ik->set_minor_version(_minor_version);
5173 ik->set_major_version(_major_version);
5174 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5175 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5176
5177 assert(!_is_hidden || ik->is_hidden(), "must be set already");
5178
5179 // Set PackageEntry for this_klass
5180 oop cl = ik->class_loader();
5181 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5182 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5183 ik->set_package(cld, nullptr, CHECK);
5184
5185 const Array<Method*>* const methods = ik->methods();
5186 assert(methods != nullptr, "invariant");
5187 const int methods_len = methods->length();
5188
5189 check_methods_for_intrinsics(ik, methods);
5190
5191 // Fill in field values obtained by parse_classfile_attributes
5192 if (_parsed_annotations->has_any_annotations()) {
5193 _parsed_annotations->apply_to(ik);
5194 }
5195
5196 apply_parsed_class_attributes(ik);
5197
5198 // Miranda methods
5199 if ((_num_miranda_methods > 0) ||
5200 // if this class introduced new miranda methods or
5201 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5202 // super class exists and this class inherited miranda methods
5203 ) {
5204 ik->set_has_miranda_methods(); // then set a flag
5205 }
5206
5207 // Fill in information needed to compute superclasses.
5208 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5209 ik->set_transitive_interfaces(_transitive_interfaces);
5210 ik->set_local_interfaces(_local_interfaces);
5211 _transitive_interfaces = nullptr;
5212 _local_interfaces = nullptr;
5213
5214 // Initialize itable offset tables
5215 klassItable::setup_itable_offset_table(ik);
5216
5217 // Compute transitive closure of interfaces this class implements
5218 // Do final class setup
5219 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5220 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5221 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5222 }
5223
5224 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5225 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5226 ik->set_has_contended_annotations(true);
5227 }
5228
5229 // Fill in has_finalizer and layout_helper
5230 set_precomputed_flags(ik);
5231
5232 // check if this class can access its super class
5233 check_super_class_access(ik, CHECK);
5234
5235 // check if this class can access its superinterfaces
5236 check_super_interface_access(ik, CHECK);
5237
5238 // check if this class overrides any final method
5239 check_final_method_override(ik, CHECK);
5240
5241 // reject static interface methods prior to Java 8
5242 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5243 check_illegal_static_method(ik, CHECK);
5244 }
5245
5246 // Obtain this_klass' module entry
5247 ModuleEntry* module_entry = ik->module();
5248 assert(module_entry != nullptr, "module_entry should always be set");
5249
5250 // Obtain java.lang.Module
5251 Handle module_handle(THREAD, module_entry->module());
5252
5253 // Allocate mirror and initialize static fields
5254 // The create_mirror() call will also call compute_modifiers()
5255 java_lang_Class::create_mirror(ik,
5256 Handle(THREAD, _loader_data->class_loader()),
5257 module_handle,
5258 _protection_domain,
5259 cl_inst_info.class_data(),
5260 CHECK);
5261
5262 assert(_all_mirandas != nullptr, "invariant");
5263
5264 // Generate any default methods - default methods are public interface methods
5265 // that have a default implementation. This is new with Java 8.
5266 if (_has_nonstatic_concrete_methods) {
5267 DefaultMethods::generate_default_methods(ik,
5268 _all_mirandas,
5269 CHECK);
5270 }
5271
5272 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5273 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5274 !module_entry->has_default_read_edges()) {
5275 if (!module_entry->set_has_default_read_edges()) {
5276 // We won a potential race
5277 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5278 }
5279 }
5280
5281 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5282
5283 if (!is_internal()) {
5284 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5285
5286 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5287 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5288 log_is_enabled(Info, class, preview)) {
5289 ResourceMark rm;
5290 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5291 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5292 }
5293
5294 if (log_is_enabled(Debug, class, resolve)) {
5295 ResourceMark rm;
5296 // print out the superclass.
5297 const char * from = ik->external_name();
5298 if (ik->java_super() != nullptr) {
5299 log_debug(class, resolve)("%s %s (super)",
5300 from,
5301 ik->java_super()->external_name());
5302 }
5303 // print out each of the interface classes referred to by this class.
5304 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5305 if (local_interfaces != nullptr) {
5306 const int length = local_interfaces->length();
5307 for (int i = 0; i < length; i++) {
5308 const InstanceKlass* const k = local_interfaces->at(i);
5309 const char * to = k->external_name();
5310 log_debug(class, resolve)("%s %s (interface)", from, to);
5311 }
5312 }
5313 }
5314 }
5315
5316 JFR_ONLY(INIT_ID(ik);)
5317
5318 // If we reach here, all is well.
5319 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5320 // in order for it to not be destroyed in the ClassFileParser destructor.
5321 set_klass_to_deallocate(nullptr);
5322
5323 // it's official
5324 set_klass(ik);
5325
5326 debug_only(ik->verify();)
5327 }
5328
5329 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5330 // Decrement the refcount in the old name, since we're clobbering it.
5331 _class_name->decrement_refcount();
5332
5333 _class_name = new_class_name;
5334 // Increment the refcount of the new name.
5335 // Now the ClassFileParser owns this name and will decrement in
5336 // the destructor.
5337 _class_name->increment_refcount();
5338 }
5339
5340 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5341 bool trusted = loader_data->is_boot_class_loader_data() ||
5342 loader_data->is_platform_class_loader_data();
5343 bool need_verify =
5344 // verifyAll
5345 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5346 // verifyRemote
5347 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5348 return !need_verify;
5349 }
5350
5351 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5352 Symbol* name,
5353 ClassLoaderData* loader_data,
5354 const ClassLoadInfo* cl_info,
5355 Publicity pub_level,
5356 TRAPS) :
5357 _stream(stream),
5358 _class_name(nullptr),
5359 _loader_data(loader_data),
5360 _is_hidden(cl_info->is_hidden()),
5361 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5362 _orig_cp_size(0),
5363 _super_klass(),
5364 _cp(nullptr),
5365 _fieldinfo_stream(nullptr),
5366 _fields_status(nullptr),
5367 _methods(nullptr),
5368 _inner_classes(nullptr),
5369 _nest_members(nullptr),
5370 _nest_host(0),
5371 _permitted_subclasses(nullptr),
5372 _record_components(nullptr),
5373 _local_interfaces(nullptr),
5374 _transitive_interfaces(nullptr),
5375 _combined_annotations(nullptr),
5376 _class_annotations(nullptr),
5377 _class_type_annotations(nullptr),
5378 _fields_annotations(nullptr),
5379 _fields_type_annotations(nullptr),
5380 _klass(nullptr),
5381 _klass_to_deallocate(nullptr),
5382 _parsed_annotations(nullptr),
5383 _fac(nullptr),
5384 _field_info(nullptr),
5385 _temp_field_info(nullptr),
5386 _method_ordering(nullptr),
5387 _all_mirandas(nullptr),
5388 _vtable_size(0),
5389 _itable_size(0),
5390 _num_miranda_methods(0),
5391 _protection_domain(cl_info->protection_domain()),
5392 _access_flags(),
5393 _pub_level(pub_level),
5394 _bad_constant_seen(0),
5395 _synthetic_flag(false),
5396 _sde_length(false),
5397 _sde_buffer(nullptr),
5398 _sourcefile_index(0),
5399 _generic_signature_index(0),
5400 _major_version(0),
5401 _minor_version(0),
5402 _this_class_index(0),
5403 _super_class_index(0),
5404 _itfs_len(0),
5405 _java_fields_count(0),
5406 _need_verify(false),
5407 _relax_verify(false),
5408 _has_nonstatic_concrete_methods(false),
5409 _declares_nonstatic_concrete_methods(false),
5410 _has_localvariable_table(false),
5411 _has_final_method(false),
5412 _has_contended_fields(false),
5413 _has_finalizer(false),
5414 _has_empty_finalizer(false),
5415 _max_bootstrap_specifier_index(-1) {
5416
5417 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5418 _class_name->increment_refcount();
5419
5420 assert(_loader_data != nullptr, "invariant");
5421 assert(stream != nullptr, "invariant");
5422 assert(_stream != nullptr, "invariant");
5423 assert(_stream->buffer() == _stream->current(), "invariant");
5424 assert(_class_name != nullptr, "invariant");
5425 assert(0 == _access_flags.as_int(), "invariant");
5426
5427 // Figure out whether we can skip format checking (matching classic VM behavior)
5428 if (CDSConfig::is_dumping_static_archive()) {
5429 // verify == true means it's a 'remote' class (i.e., non-boot class)
5430 // Verification decision is based on BytecodeVerificationRemote flag
5431 // for those classes.
5432 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
5433 BytecodeVerificationLocal;
5434 }
5435 else {
5436 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
5437 stream->need_verify());
5438 }
5439
5440 // synch back verification state to stream
5441 stream->set_verify(_need_verify);
5442
5443 // Check if verification needs to be relaxed for this class file
5444 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
5445 _relax_verify = relax_format_check_for(_loader_data);
5446
5447 parse_stream(stream, CHECK);
5448
5449 post_process_parsed_stream(stream, _cp, CHECK);
5450 }
5451
5452 void ClassFileParser::clear_class_metadata() {
5453 // metadata created before the instance klass is created. Must be
5454 // deallocated if classfile parsing returns an error.
5455 _cp = nullptr;
5456 _fieldinfo_stream = nullptr;
5457 _fields_status = nullptr;
5458 _methods = nullptr;
5459 _inner_classes = nullptr;
5460 _nest_members = nullptr;
5461 _permitted_subclasses = nullptr;
5462 _combined_annotations = nullptr;
5463 _class_annotations = _class_type_annotations = nullptr;
5464 _fields_annotations = _fields_type_annotations = nullptr;
5465 _record_components = nullptr;
5466 }
5467
5468 // Destructor to clean up
5469 ClassFileParser::~ClassFileParser() {
5470 _class_name->decrement_refcount();
5471
5472 if (_cp != nullptr) {
5473 MetadataFactory::free_metadata(_loader_data, _cp);
5474 }
5475
5476 if (_fieldinfo_stream != nullptr) {
5477 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5478 }
5479
5480 if (_fields_status != nullptr) {
5481 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5482 }
5483
5484 if (_methods != nullptr) {
5485 // Free methods
5486 InstanceKlass::deallocate_methods(_loader_data, _methods);
5487 }
5488
5489 // beware of the Universe::empty_blah_array!!
5490 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5491 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5492 }
5493
5494 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5495 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5496 }
5497
5498 if (_record_components != nullptr) {
5499 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5500 }
5501
5502 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5503 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5504 }
5505
5506 // Free interfaces
5507 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5508 _local_interfaces, _transitive_interfaces);
5509
5510 if (_combined_annotations != nullptr) {
5511 // After all annotations arrays have been created, they are installed into the
5512 // Annotations object that will be assigned to the InstanceKlass being created.
5513
5514 // Deallocate the Annotations object and the installed annotations arrays.
5515 _combined_annotations->deallocate_contents(_loader_data);
5516
5517 // If the _combined_annotations pointer is non-null,
5518 // then the other annotations fields should have been cleared.
5519 assert(_class_annotations == nullptr, "Should have been cleared");
5520 assert(_class_type_annotations == nullptr, "Should have been cleared");
5521 assert(_fields_annotations == nullptr, "Should have been cleared");
5522 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5523 } else {
5524 // If the annotations arrays were not installed into the Annotations object,
5525 // then they have to be deallocated explicitly.
5526 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
5527 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
5528 Annotations::free_contents(_loader_data, _fields_annotations);
5529 Annotations::free_contents(_loader_data, _fields_type_annotations);
5530 }
5531
5532 clear_class_metadata();
5533 _transitive_interfaces = nullptr;
5534 _local_interfaces = nullptr;
5535
5536 // deallocate the klass if already created. Don't directly deallocate, but add
5537 // to the deallocate list so that the klass is removed from the CLD::_klasses list
5538 // at a safepoint.
5539 if (_klass_to_deallocate != nullptr) {
5540 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5541 }
5542 }
5543
5544 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5545 TRAPS) {
5546
5547 assert(stream != nullptr, "invariant");
5548 assert(_class_name != nullptr, "invariant");
5549
5550 // BEGIN STREAM PARSING
5551 stream->guarantee_more(8, CHECK); // magic, major, minor
5552 // Magic value
5553 const u4 magic = stream->get_u4_fast();
5554 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5555 "Incompatible magic value %u in class file %s",
5556 magic, CHECK);
5557
5558 // Version numbers
5559 _minor_version = stream->get_u2_fast();
5560 _major_version = stream->get_u2_fast();
5561
5562 // Check version numbers - we check this even with verifier off
5563 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
5564
5565 stream->guarantee_more(3, CHECK); // length, first cp tag
5566 u2 cp_size = stream->get_u2_fast();
5567
5568 guarantee_property(
5569 cp_size >= 1, "Illegal constant pool size %u in class file %s",
5570 cp_size, CHECK);
5571
5572 _orig_cp_size = cp_size;
5573 if (is_hidden()) { // Add a slot for hidden class name.
5574 cp_size++;
5575 }
5576
5577 _cp = ConstantPool::allocate(_loader_data,
5578 cp_size,
5579 CHECK);
5580
5581 ConstantPool* const cp = _cp;
5582
5583 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5584
5585 assert(cp_size == (u2)cp->length(), "invariant");
5586
5587 // ACCESS FLAGS
5588 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5589
5590 // Access flags
5591 jint flags;
5592 // JVM_ACC_MODULE is defined in JDK-9 and later.
5593 if (_major_version >= JAVA_9_VERSION) {
5594 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5595 } else {
5596 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5597 }
5598
5599 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5600 // Set abstract bit for old class files for backward compatibility
5601 flags |= JVM_ACC_ABSTRACT;
5602 }
5603
5604 verify_legal_class_modifiers(flags, CHECK);
5605
5606 short bad_constant = class_bad_constant_seen();
5607 if (bad_constant != 0) {
5608 // Do not throw CFE until after the access_flags are checked because if
5609 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5610 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5611 return;
5612 }
5613
5614 _access_flags.set_flags(flags);
5615
5616 // This class and superclass
5617 _this_class_index = stream->get_u2_fast();
5618 check_property(
5619 valid_cp_range(_this_class_index, cp_size) &&
5620 cp->tag_at(_this_class_index).is_unresolved_klass(),
5621 "Invalid this class index %u in constant pool in class file %s",
5622 _this_class_index, CHECK);
5623
5624 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5625 assert(class_name_in_cp != nullptr, "class_name can't be null");
5626
5627 // Don't need to check whether this class name is legal or not.
5628 // It has been checked when constant pool is parsed.
5629 // However, make sure it is not an array type.
5630 if (_need_verify) {
5631 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
5632 "Bad class name in class file %s",
5633 CHECK);
5634 }
5635
5636 #ifdef ASSERT
5637 // Basic sanity checks
5638 if (_is_hidden) {
5639 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
5640 }
5641 #endif
5642
5643 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
5644
5645 if (_is_hidden) {
5646 assert(_class_name != nullptr, "Unexpected null _class_name");
5647 #ifdef ASSERT
5648 if (_need_verify) {
5649 verify_legal_class_name(_class_name, CHECK);
5650 }
5651 #endif
5652
5653 } else {
5654 // Check if name in class file matches given name
5655 if (_class_name != class_name_in_cp) {
5656 if (_class_name != vmSymbols::unknown_class_name()) {
5657 ResourceMark rm(THREAD);
5658 Exceptions::fthrow(THREAD_AND_LOCATION,
5659 vmSymbols::java_lang_NoClassDefFoundError(),
5660 "%s (wrong name: %s)",
5661 _class_name->as_C_string(),
5662 class_name_in_cp->as_C_string()
5663 );
5664 return;
5665 } else {
5666 // The class name was not known by the caller so we set it from
5667 // the value in the CP.
5668 update_class_name(class_name_in_cp);
5669 }
5670 // else nothing to do: the expected class name matches what is in the CP
5671 }
5672 }
5673
5674 // Verification prevents us from creating names with dots in them, this
5675 // asserts that that's the case.
5676 assert(is_internal_format(_class_name), "external class name format used internally");
5677
5678 if (!is_internal()) {
5679 LogTarget(Debug, class, preorder) lt;
5680 if (lt.is_enabled()){
5681 ResourceMark rm(THREAD);
5682 LogStream ls(lt);
5683 ls.print("%s", _class_name->as_klass_external_name());
5684 if (stream->source() != nullptr) {
5685 ls.print(" source: %s", stream->source());
5686 }
5687 ls.cr();
5688 }
5689 }
5690
5691 // SUPERKLASS
5692 _super_class_index = stream->get_u2_fast();
5693 _super_klass = parse_super_class(cp,
5694 _super_class_index,
5695 _need_verify,
5696 CHECK);
5697
5698 // Interfaces
5699 _itfs_len = stream->get_u2_fast();
5700 parse_interfaces(stream,
5701 _itfs_len,
5702 cp,
5703 &_has_nonstatic_concrete_methods,
5704 CHECK);
5705
5706 assert(_local_interfaces != nullptr, "invariant");
5707
5708 // Fields (offsets are filled in later)
5709 _fac = new FieldAllocationCount();
5710 parse_fields(stream,
5711 _access_flags.is_interface(),
5712 _fac,
5713 cp,
5714 cp_size,
5715 &_java_fields_count,
5716 CHECK);
5717
5718 assert(_temp_field_info != nullptr, "invariant");
5719
5720 // Methods
5721 parse_methods(stream,
5722 _access_flags.is_interface(),
5723 &_has_localvariable_table,
5724 &_has_final_method,
5725 &_declares_nonstatic_concrete_methods,
5726 CHECK);
5727
5728 assert(_methods != nullptr, "invariant");
5729
5730 if (_declares_nonstatic_concrete_methods) {
5731 _has_nonstatic_concrete_methods = true;
5732 }
5733
5734 // Additional attributes/annotations
5735 _parsed_annotations = new ClassAnnotationCollector();
5736 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
5737
5738 assert(_inner_classes != nullptr, "invariant");
5739
5740 // Finalize the Annotations metadata object,
5741 // now that all annotation arrays have been created.
5742 create_combined_annotations(CHECK);
5743
5744 // Make sure this is the end of class file stream
5745 guarantee_property(stream->at_eos(),
5746 "Extra bytes at the end of class file %s",
5747 CHECK);
5748
5749 // all bytes in stream read and parsed
5750 }
5751
5752 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
5753 ResourceMark rm;
5754 // Construct hidden name from _class_name, "+", and &ik. Note that we can't
5755 // use a '/' because that confuses finding the class's package. Also, can't
5756 // use an illegal char such as ';' because that causes serialization issues
5757 // and issues with hidden classes that create their own hidden classes.
5758 char addr_buf[20];
5759 if (CDSConfig::is_dumping_static_archive()) {
5760 // We want stable names for the archived hidden classes (only for static
5761 // archive for now). Spaces under default_SharedBaseAddress() will be
5762 // occupied by the archive at run time, so we know that no dynamically
5763 // loaded InstanceKlass will be placed under there.
5764 static volatile size_t counter = 0;
5765 Atomic::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
5766 size_t new_id = Atomic::add(&counter, (size_t)1);
5767 jio_snprintf(addr_buf, 20, SIZE_FORMAT_X, new_id);
5768 } else {
5769 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
5770 }
5771 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
5772 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
5773 jio_snprintf(new_name, new_name_len, "%s+%s",
5774 _class_name->as_C_string(), addr_buf);
5775 update_class_name(SymbolTable::new_symbol(new_name));
5776
5777 // Add a Utf8 entry containing the hidden name.
5778 assert(_class_name != nullptr, "Unexpected null _class_name");
5779 int hidden_index = _orig_cp_size; // this is an extra slot we added
5780 _cp->symbol_at_put(hidden_index, _class_name);
5781
5782 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
5783 // We have to update the resolved_klass_index and the name_index together
5784 // so extract the existing resolved_klass_index first.
5785 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
5786 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
5787 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
5788 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
5789 "Bad name_index");
5790 }
5791
5792 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
5793 ConstantPool* cp,
5794 TRAPS) {
5795 assert(stream != nullptr, "invariant");
5796 assert(stream->at_eos(), "invariant");
5797 assert(cp != nullptr, "invariant");
5798 assert(_loader_data != nullptr, "invariant");
5799
5800 if (_class_name == vmSymbols::java_lang_Object()) {
5801 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
5802 "java.lang.Object cannot implement an interface in class file %s",
5803 CHECK);
5804 }
5805 // We check super class after class file is parsed and format is checked
5806 if (_super_class_index > 0 && nullptr == _super_klass) {
5807 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
5808 if (_access_flags.is_interface()) {
5809 // Before attempting to resolve the superclass, check for class format
5810 // errors not checked yet.
5811 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
5812 "Interfaces must have java.lang.Object as superclass in class file %s",
5813 CHECK);
5814 }
5815 Handle loader(THREAD, _loader_data->class_loader());
5816 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
5817 _super_klass = vmClasses::Object_klass();
5818 } else {
5819 _super_klass = (const InstanceKlass*)
5820 SystemDictionary::resolve_super_or_fail(_class_name,
5821 super_class_name,
5822 loader,
5823 _protection_domain,
5824 true,
5825 CHECK);
5826 }
5827 }
5828
5829 if (_super_klass != nullptr) {
5830 if (_super_klass->has_nonstatic_concrete_methods()) {
5831 _has_nonstatic_concrete_methods = true;
5832 }
5833
5834 if (_super_klass->is_interface()) {
5835 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
5836 return;
5837 }
5838 }
5839
5840 // Compute the transitive list of all unique interfaces implemented by this class
5841 _transitive_interfaces =
5842 compute_transitive_interfaces(_super_klass,
5843 _local_interfaces,
5844 _loader_data,
5845 CHECK);
5846
5847 assert(_transitive_interfaces != nullptr, "invariant");
5848
5849 // sort methods
5850 _method_ordering = sort_methods(_methods);
5851
5852 _all_mirandas = new GrowableArray<Method*>(20);
5853
5854 Handle loader(THREAD, _loader_data->class_loader());
5855 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
5856 &_num_miranda_methods,
5857 _all_mirandas,
5858 _super_klass,
5859 _methods,
5860 _access_flags,
5861 _major_version,
5862 loader,
5863 _class_name,
5864 _local_interfaces);
5865
5866 // Size of Java itable (in words)
5867 _itable_size = _access_flags.is_interface() ? 0 :
5868 klassItable::compute_itable_size(_transitive_interfaces);
5869
5870 assert(_fac != nullptr, "invariant");
5871 assert(_parsed_annotations != nullptr, "invariant");
5872
5873 _field_info = new FieldLayoutInfo();
5874 FieldLayoutBuilder lb(class_name(), super_klass(), _cp, /*_fields*/ _temp_field_info,
5875 _parsed_annotations->is_contended(), _field_info);
5876 lb.build_layout();
5877
5878 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
5879 _fieldinfo_stream =
5880 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
5881 injected_fields_count, loader_data(), CHECK);
5882 _fields_status =
5883 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
5884 FieldStatus(0), CHECK);
5885 }
5886
5887 void ClassFileParser::set_klass(InstanceKlass* klass) {
5888
5889 #ifdef ASSERT
5890 if (klass != nullptr) {
5891 assert(nullptr == _klass, "leaking?");
5892 }
5893 #endif
5894
5895 _klass = klass;
5896 }
5897
5898 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
5899
5900 #ifdef ASSERT
5901 if (klass != nullptr) {
5902 assert(nullptr == _klass_to_deallocate, "leaking?");
5903 }
5904 #endif
5905
5906 _klass_to_deallocate = klass;
5907 }
5908
5909 // Caller responsible for ResourceMark
5910 // clone stream with rewound position
5911 const ClassFileStream* ClassFileParser::clone_stream() const {
5912 assert(_stream != nullptr, "invariant");
5913
5914 return _stream->clone();
5915 }
5916
5917 ReferenceType ClassFileParser::super_reference_type() const {
5918 return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type();
5919 }
5920
5921 bool ClassFileParser::is_instance_ref_klass() const {
5922 // Only the subclasses of j.l.r.Reference are InstanceRefKlass.
5923 // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
5924 // klass requiring special treatment in ref-processing. The abstract
5925 // j.l.r.Reference cannot be instantiated so doesn't partake in
5926 // ref-processing.
5927 return is_java_lang_ref_Reference_subclass();
5928 }
5929
5930 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
5931 if (_super_klass == nullptr) {
5932 return false;
5933 }
5934
5935 if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
5936 // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
5937 return true;
5938 }
5939
5940 return _super_klass->reference_type() != REF_NONE;
5941 }
5942
5943 // ----------------------------------------------------------------------------
5944 // debugging
5945
5946 #ifdef ASSERT
5947
5948 // return true if class_name contains no '.' (internal format is '/')
5949 bool ClassFileParser::is_internal_format(Symbol* class_name) {
5950 if (class_name != nullptr) {
5951 ResourceMark rm;
5952 char* name = class_name->as_C_string();
5953 return strchr(name, JVM_SIGNATURE_DOT) == nullptr;
5954 } else {
5955 return true;
5956 }
5957 }
5958
5959 #endif