1 /*
2 * Copyright (c) 1997, 2026, 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 "cds/cdsConfig.hpp"
25 #include "classfile/classFileParser.hpp"
26 #include "classfile/classFileStream.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.inline.hpp"
29 #include "classfile/classLoadInfo.hpp"
30 #include "classfile/defaultMethods.hpp"
31 #include "classfile/fieldLayoutBuilder.hpp"
32 #include "classfile/javaClasses.inline.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/packageEntry.hpp"
35 #include "classfile/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/systemDictionaryShared.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/bsmAttribute.inline.hpp"
52 #include "oops/constantPool.inline.hpp"
53 #include "oops/fieldInfo.hpp"
54 #include "oops/fieldStreams.inline.hpp"
55 #include "oops/instanceKlass.inline.hpp"
56 #include "oops/instanceMirrorKlass.hpp"
57 #include "oops/klass.inline.hpp"
58 #include "oops/klassVtable.hpp"
59 #include "oops/metadata.hpp"
60 #include "oops/method.inline.hpp"
61 #include "oops/oop.inline.hpp"
62 #include "oops/recordComponent.hpp"
63 #include "oops/symbol.hpp"
64 #include "prims/jvmtiExport.hpp"
65 #include "prims/jvmtiThreadState.hpp"
66 #include "runtime/arguments.hpp"
67 #include "runtime/fieldDescriptor.inline.hpp"
68 #include "runtime/handles.inline.hpp"
69 #include "runtime/javaCalls.hpp"
70 #include "runtime/os.hpp"
71 #include "runtime/perfData.hpp"
72 #include "runtime/reflection.hpp"
73 #include "runtime/safepointVerifiers.hpp"
74 #include "runtime/signature.hpp"
75 #include "runtime/timer.hpp"
76 #include "services/classLoadingService.hpp"
77 #include "services/threadService.hpp"
78 #include "utilities/align.hpp"
79 #include "utilities/bitMap.inline.hpp"
80 #include "utilities/checkedCast.hpp"
81 #include "utilities/copy.hpp"
82 #include "utilities/exceptions.hpp"
83 #include "utilities/formatBuffer.hpp"
84 #include "utilities/globalDefinitions.hpp"
85 #include "utilities/growableArray.hpp"
86 #include "utilities/hashTable.hpp"
87 #include "utilities/macros.hpp"
88 #include "utilities/ostream.hpp"
89 #include "utilities/utf8.hpp"
90
91 // We generally try to create the oops directly when parsing, rather than
92 // allocating temporary data structures and copying the bytes twice. A
93 // temporary area is only needed when parsing utf8 entries in the constant
94 // pool and when parsing line number tables.
95
96 // We add assert in debug mode when class format is not checked.
97
98 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
99 #define JAVA_MIN_SUPPORTED_VERSION 45
100 #define JAVA_PREVIEW_MINOR_VERSION 65535
101
102 // Used for two backward compatibility reasons:
103 // - to check for new additions to the class file format in JDK1.5
104 // - to check for bug fixes in the format checker in JDK1.5
105 #define JAVA_1_5_VERSION 49
106
107 // Used for backward compatibility reasons:
108 // - to check for javac bug fixes that happened after 1.5
109 // - also used as the max version when running in jdk6
110 #define JAVA_6_VERSION 50
111
112 // Used for backward compatibility reasons:
113 // - to disallow argument and require ACC_STATIC for <clinit> methods
114 #define JAVA_7_VERSION 51
115
116 // Extension method support.
117 #define JAVA_8_VERSION 52
118
119 #define JAVA_9_VERSION 53
120
121 #define JAVA_10_VERSION 54
122
123 #define JAVA_11_VERSION 55
124
125 #define JAVA_12_VERSION 56
126
127 #define JAVA_13_VERSION 57
128
129 #define JAVA_14_VERSION 58
130
131 #define JAVA_15_VERSION 59
132
133 #define JAVA_16_VERSION 60
134
135 #define JAVA_17_VERSION 61
136
137 #define JAVA_18_VERSION 62
138
139 #define JAVA_19_VERSION 63
140
141 #define JAVA_20_VERSION 64
142
143 #define JAVA_21_VERSION 65
144
145 #define JAVA_22_VERSION 66
146
147 #define JAVA_23_VERSION 67
148
149 #define JAVA_24_VERSION 68
150
151 #define JAVA_25_VERSION 69
152
153 #define JAVA_26_VERSION 70
154
155 #define JAVA_27_VERSION 71
156
157 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
158 assert((bad_constant == JVM_CONSTANT_Module ||
159 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
160 "Unexpected bad constant pool entry");
161 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
162 }
163
164 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
165 ConstantPool* cp,
166 const int length,
167 TRAPS) {
168 assert(stream != nullptr, "invariant");
169 assert(cp != nullptr, "invariant");
170
171 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
172 // this function (_current can be allocated in a register, with scalar
173 // replacement of aggregates). The _current pointer is copied back to
174 // stream() when this function returns. DON'T call another method within
175 // this method that uses stream().
176 const ClassFileStream cfs1 = *stream;
177 const ClassFileStream* const cfs = &cfs1;
178
179 DEBUG_ONLY(const u1* const old_current = stream->current();)
180
181 // Used for batching symbol allocations.
182 const char* names[SymbolTable::symbol_alloc_batch_size];
183 int lengths[SymbolTable::symbol_alloc_batch_size];
184 int indices[SymbolTable::symbol_alloc_batch_size];
185 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
186 int names_count = 0;
187
188 // parsing Index 0 is unused
189 for (int index = 1; index < length; index++) {
190 // Each of the following case guarantees one more byte in the stream
191 // for the following tag or the access_flags following constant pool,
192 // so we don't need bounds-check for reading tag.
193 const u1 tag = cfs->get_u1_fast();
194 switch (tag) {
195 case JVM_CONSTANT_Class: {
196 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
197 const u2 name_index = cfs->get_u2_fast();
198 cp->klass_index_at_put(index, name_index);
199 break;
200 }
201 case JVM_CONSTANT_Fieldref: {
202 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
203 const u2 class_index = cfs->get_u2_fast();
204 const u2 name_and_type_index = cfs->get_u2_fast();
205 cp->field_at_put(index, class_index, name_and_type_index);
206 break;
207 }
208 case JVM_CONSTANT_Methodref: {
209 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
210 const u2 class_index = cfs->get_u2_fast();
211 const u2 name_and_type_index = cfs->get_u2_fast();
212 cp->method_at_put(index, class_index, name_and_type_index);
213 break;
214 }
215 case JVM_CONSTANT_InterfaceMethodref: {
216 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
217 const u2 class_index = cfs->get_u2_fast();
218 const u2 name_and_type_index = cfs->get_u2_fast();
219 cp->interface_method_at_put(index, class_index, name_and_type_index);
220 break;
221 }
222 case JVM_CONSTANT_String : {
223 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
224 const u2 string_index = cfs->get_u2_fast();
225 cp->string_index_at_put(index, string_index);
226 break;
227 }
228 case JVM_CONSTANT_MethodHandle :
229 case JVM_CONSTANT_MethodType: {
230 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
231 classfile_parse_error(
232 "Class file version does not support constant tag %u in class file %s",
233 tag, THREAD);
234 return;
235 }
236 if (tag == JVM_CONSTANT_MethodHandle) {
237 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
238 const u1 ref_kind = cfs->get_u1_fast();
239 const u2 method_index = cfs->get_u2_fast();
240 cp->method_handle_index_at_put(index, ref_kind, method_index);
241 }
242 else if (tag == JVM_CONSTANT_MethodType) {
243 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
244 const u2 signature_index = cfs->get_u2_fast();
245 cp->method_type_index_at_put(index, signature_index);
246 }
247 else {
248 ShouldNotReachHere();
249 }
250 break;
251 }
252 case JVM_CONSTANT_Dynamic : {
253 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
254 classfile_parse_error(
255 "Class file version does not support constant tag %u in class file %s",
256 tag, THREAD);
257 return;
258 }
259 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
260 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
261 const u2 name_and_type_index = cfs->get_u2_fast();
262 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
263 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
264 }
265 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
266 break;
267 }
268 case JVM_CONSTANT_InvokeDynamic : {
269 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
270 classfile_parse_error(
271 "Class file version does not support constant tag %u in class file %s",
272 tag, THREAD);
273 return;
274 }
275 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
276 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
277 const u2 name_and_type_index = cfs->get_u2_fast();
278 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
279 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
280 }
281 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
282 break;
283 }
284 case JVM_CONSTANT_Integer: {
285 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
286 const u4 bytes = cfs->get_u4_fast();
287 cp->int_at_put(index, (jint)bytes);
288 break;
289 }
290 case JVM_CONSTANT_Float: {
291 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
292 const u4 bytes = cfs->get_u4_fast();
293 cp->float_at_put(index, *(jfloat*)&bytes);
294 break;
295 }
296 case JVM_CONSTANT_Long: {
297 // A mangled type might cause you to overrun allocated memory
298 guarantee_property(index + 1 < length,
299 "Invalid constant pool entry %u in class file %s",
300 index,
301 CHECK);
302 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
303 const u8 bytes = cfs->get_u8_fast();
304 cp->long_at_put(index, bytes);
305 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
306 break;
307 }
308 case JVM_CONSTANT_Double: {
309 // A mangled type might cause you to overrun allocated memory
310 guarantee_property(index+1 < length,
311 "Invalid constant pool entry %u in class file %s",
312 index,
313 CHECK);
314 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
315 const u8 bytes = cfs->get_u8_fast();
316 cp->double_at_put(index, *(jdouble*)&bytes);
317 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
318 break;
319 }
320 case JVM_CONSTANT_NameAndType: {
321 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
322 const u2 name_index = cfs->get_u2_fast();
323 const u2 signature_index = cfs->get_u2_fast();
324 cp->name_and_type_at_put(index, name_index, signature_index);
325 break;
326 }
327 case JVM_CONSTANT_Utf8 : {
328 cfs->guarantee_more(2, CHECK); // utf8_length
329 u2 utf8_length = cfs->get_u2_fast();
330 const u1* utf8_buffer = cfs->current();
331 assert(utf8_buffer != nullptr, "null utf8 buffer");
332 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
333 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
334 cfs->skip_u1_fast(utf8_length);
335
336 // Before storing the symbol, make sure it's legal
337 if (_need_verify) {
338 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
339 }
340
341 unsigned int hash;
342 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
343 utf8_length,
344 hash);
345 if (result == nullptr) {
346 names[names_count] = (const char*)utf8_buffer;
347 lengths[names_count] = utf8_length;
348 indices[names_count] = index;
349 hashValues[names_count++] = hash;
350 if (names_count == SymbolTable::symbol_alloc_batch_size) {
351 SymbolTable::new_symbols(_loader_data,
352 constantPoolHandle(THREAD, cp),
353 names_count,
354 names,
355 lengths,
356 indices,
357 hashValues);
358 names_count = 0;
359 }
360 } else {
361 cp->symbol_at_put(index, result);
362 }
363 break;
364 }
365 case JVM_CONSTANT_Module:
366 case JVM_CONSTANT_Package: {
367 // Record that an error occurred in these two cases but keep parsing so
368 // that ACC_Module can be checked for in the access_flags. Need to
369 // throw NoClassDefFoundError in that case.
370 if (_major_version >= JAVA_9_VERSION) {
371 cfs->guarantee_more(3, CHECK);
372 cfs->get_u2_fast();
373 set_class_bad_constant_seen(tag);
374 break;
375 }
376 }
377 default: {
378 classfile_parse_error("Unknown constant tag %u in class file %s",
379 tag,
380 THREAD);
381 return;
382 }
383 } // end of switch(tag)
384 } // end of for
385
386 // Allocate the remaining symbols
387 if (names_count > 0) {
388 SymbolTable::new_symbols(_loader_data,
389 constantPoolHandle(THREAD, cp),
390 names_count,
391 names,
392 lengths,
393 indices,
394 hashValues);
395 }
396
397 // Copy _current pointer of local copy back to stream.
398 assert(stream->current() == old_current, "non-exclusive use of stream");
399 stream->set_current(cfs1.current());
400
401 }
402
403 static inline bool valid_cp_range(int index, int length) {
404 return (index > 0 && index < length);
405 }
406
407 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
408 assert(cp != nullptr, "invariant");
409 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
410 return cp->symbol_at(index);
411 }
412 return nullptr;
413 }
414
415 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
416 ConstantPool* const cp,
417 const int length,
418 TRAPS) {
419 assert(cp != nullptr, "invariant");
420 assert(stream != nullptr, "invariant");
421
422 // parsing constant pool entries
423 parse_constant_pool_entries(stream, cp, length, CHECK);
424 if (class_bad_constant_seen() != 0) {
425 // a bad CP entry has been detected previously so stop parsing and just return.
426 return;
427 }
428
429 int index = 1; // declared outside of loops for portability
430 int num_klasses = 0;
431
432 // first verification pass - validate cross references
433 // and fixup class and string constants
434 for (index = 1; index < length; index++) { // Index 0 is unused
435 const jbyte tag = cp->tag_at(index).value();
436 switch (tag) {
437 case JVM_CONSTANT_Class: {
438 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
439 break;
440 }
441 case JVM_CONSTANT_Fieldref:
442 // fall through
443 case JVM_CONSTANT_Methodref:
444 // fall through
445 case JVM_CONSTANT_InterfaceMethodref: {
446 if (!_need_verify) break;
447 const int klass_ref_index = cp->uncached_klass_ref_index_at(index);
448 const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index);
449 guarantee_property(valid_klass_reference_at(klass_ref_index),
450 "Invalid constant pool index %u in class file %s",
451 klass_ref_index, CHECK);
452 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
453 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
454 "Invalid constant pool index %u in class file %s",
455 name_and_type_ref_index, CHECK);
456 break;
457 }
458 case JVM_CONSTANT_String: {
459 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
460 break;
461 }
462 case JVM_CONSTANT_Integer:
463 break;
464 case JVM_CONSTANT_Float:
465 break;
466 case JVM_CONSTANT_Long:
467 case JVM_CONSTANT_Double: {
468 index++;
469 guarantee_property(
470 (index < length && cp->tag_at(index).is_invalid()),
471 "Improper constant pool long/double index %u in class file %s",
472 index, CHECK);
473 break;
474 }
475 case JVM_CONSTANT_NameAndType: {
476 if (!_need_verify) break;
477 const int name_ref_index = cp->name_ref_index_at(index);
478 const int signature_ref_index = cp->signature_ref_index_at(index);
479 guarantee_property(valid_symbol_at(name_ref_index),
480 "Invalid constant pool index %u in class file %s",
481 name_ref_index, CHECK);
482 guarantee_property(valid_symbol_at(signature_ref_index),
483 "Invalid constant pool index %u in class file %s",
484 signature_ref_index, CHECK);
485 break;
486 }
487 case JVM_CONSTANT_Utf8:
488 break;
489 case JVM_CONSTANT_UnresolvedClass: // fall-through
490 case JVM_CONSTANT_UnresolvedClassInError: {
491 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
492 break;
493 }
494 case JVM_CONSTANT_ClassIndex: {
495 const int class_index = cp->klass_index_at(index);
496 guarantee_property(valid_symbol_at(class_index),
497 "Invalid constant pool index %u in class file %s",
498 class_index, CHECK);
499 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
500 break;
501 }
502 case JVM_CONSTANT_StringIndex: {
503 const int string_index = cp->string_index_at(index);
504 guarantee_property(valid_symbol_at(string_index),
505 "Invalid constant pool index %u in class file %s",
506 string_index, CHECK);
507 Symbol* const sym = cp->symbol_at(string_index);
508 cp->unresolved_string_at_put(index, sym);
509 break;
510 }
511 case JVM_CONSTANT_MethodHandle: {
512 const int ref_index = cp->method_handle_index_at(index);
513 guarantee_property(valid_cp_range(ref_index, length),
514 "Invalid constant pool index %u in class file %s",
515 ref_index, CHECK);
516 const constantTag tag = cp->tag_at(ref_index);
517 const int ref_kind = cp->method_handle_ref_kind_at(index);
518
519 switch (ref_kind) {
520 case JVM_REF_getField:
521 case JVM_REF_getStatic:
522 case JVM_REF_putField:
523 case JVM_REF_putStatic: {
524 guarantee_property(
525 tag.is_field(),
526 "Invalid constant pool index %u in class file %s (not a field)",
527 ref_index, CHECK);
528 break;
529 }
530 case JVM_REF_invokeVirtual:
531 case JVM_REF_newInvokeSpecial: {
532 guarantee_property(
533 tag.is_method(),
534 "Invalid constant pool index %u in class file %s (not a method)",
535 ref_index, CHECK);
536 break;
537 }
538 case JVM_REF_invokeStatic:
539 case JVM_REF_invokeSpecial: {
540 guarantee_property(
541 tag.is_method() ||
542 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
543 "Invalid constant pool index %u in class file %s (not a method)",
544 ref_index, CHECK);
545 break;
546 }
547 case JVM_REF_invokeInterface: {
548 guarantee_property(
549 tag.is_interface_method(),
550 "Invalid constant pool index %u in class file %s (not an interface method)",
551 ref_index, CHECK);
552 break;
553 }
554 default: {
555 classfile_parse_error(
556 "Bad method handle kind at constant pool index %u in class file %s",
557 index, THREAD);
558 return;
559 }
560 } // switch(refkind)
561 // Keep the ref_index unchanged. It will be indirected at link-time.
562 break;
563 } // case MethodHandle
564 case JVM_CONSTANT_MethodType: {
565 const int ref_index = cp->method_type_index_at(index);
566 guarantee_property(valid_symbol_at(ref_index),
567 "Invalid constant pool index %u in class file %s",
568 ref_index, CHECK);
569 break;
570 }
571 case JVM_CONSTANT_Dynamic: {
572 const int name_and_type_ref_index =
573 cp->bootstrap_name_and_type_ref_index_at(index);
574
575 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
576 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
577 "Invalid constant pool index %u in class file %s",
578 name_and_type_ref_index, CHECK);
579 // bootstrap specifier index must be checked later,
580 // when BootstrapMethods attr is available
581
582 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
583 cp->set_has_dynamic_constant();
584 break;
585 }
586 case JVM_CONSTANT_InvokeDynamic: {
587 const int name_and_type_ref_index =
588 cp->bootstrap_name_and_type_ref_index_at(index);
589
590 guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
591 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
592 "Invalid constant pool index %u in class file %s",
593 name_and_type_ref_index, CHECK);
594 // bootstrap specifier index must be checked later,
595 // when BootstrapMethods attr is available
596 break;
597 }
598 default: {
599 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
600 ShouldNotReachHere();
601 break;
602 }
603 } // switch(tag)
604 } // end of for
605
606 cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
607
608 if (!_need_verify) {
609 return;
610 }
611
612 // second verification pass - checks the strings are of the right format.
613 // but not yet to the other entries
614 for (index = 1; index < length; index++) {
615 const jbyte tag = cp->tag_at(index).value();
616 switch (tag) {
617 case JVM_CONSTANT_UnresolvedClass: {
618 const Symbol* const class_name = cp->klass_name_at(index);
619 // check the name
620 verify_legal_class_name(class_name, CHECK);
621 break;
622 }
623 case JVM_CONSTANT_NameAndType: {
624 if (_need_verify) {
625 const int sig_index = cp->signature_ref_index_at(index);
626 const int name_index = cp->name_ref_index_at(index);
627 const Symbol* const name = cp->symbol_at(name_index);
628 const Symbol* const sig = cp->symbol_at(sig_index);
629 guarantee_property(sig->utf8_length() != 0,
630 "Illegal zero length constant pool entry at %d in class %s",
631 sig_index, CHECK);
632 guarantee_property(name->utf8_length() != 0,
633 "Illegal zero length constant pool entry at %d in class %s",
634 name_index, CHECK);
635
636 if (Signature::is_method(sig)) {
637 // Format check method name and signature
638 verify_legal_method_name(name, CHECK);
639 verify_legal_method_signature(name, sig, CHECK);
640 } else {
641 // Format check field name and signature
642 verify_legal_field_name(name, CHECK);
643 verify_legal_field_signature(name, sig, CHECK);
644 }
645 }
646 break;
647 }
648 case JVM_CONSTANT_Dynamic: {
649 const int name_and_type_ref_index =
650 cp->uncached_name_and_type_ref_index_at(index);
651 // already verified to be utf8
652 const int name_ref_index =
653 cp->name_ref_index_at(name_and_type_ref_index);
654 // already verified to be utf8
655 const int signature_ref_index =
656 cp->signature_ref_index_at(name_and_type_ref_index);
657 const Symbol* const name = cp->symbol_at(name_ref_index);
658 const Symbol* const signature = cp->symbol_at(signature_ref_index);
659 if (_need_verify) {
660 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
661 // Need only to be sure signature is the right type.
662 if (Signature::is_method(signature)) {
663 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
664 }
665 }
666 break;
667 }
668 case JVM_CONSTANT_InvokeDynamic:
669 case JVM_CONSTANT_Fieldref:
670 case JVM_CONSTANT_Methodref:
671 case JVM_CONSTANT_InterfaceMethodref: {
672 const int name_and_type_ref_index =
673 cp->uncached_name_and_type_ref_index_at(index);
674 // already verified to be utf8
675 const int name_ref_index =
676 cp->name_ref_index_at(name_and_type_ref_index);
677 // already verified to be utf8
678 const int signature_ref_index =
679 cp->signature_ref_index_at(name_and_type_ref_index);
680 const Symbol* const name = cp->symbol_at(name_ref_index);
681 const Symbol* const signature = cp->symbol_at(signature_ref_index);
682 if (tag == JVM_CONSTANT_Fieldref) {
683 if (_need_verify) {
684 // Field name and signature are verified above, when iterating NameAndType_info.
685 // Need only to be sure signature is non-zero length and the right type.
686 if (Signature::is_method(signature)) {
687 throwIllegalSignature("Field", name, signature, CHECK);
688 }
689 }
690 } else {
691 if (_need_verify) {
692 // Method name and signature are individually verified above, when iterating
693 // NameAndType_info. Need to check here that signature is non-zero length and
694 // the right type.
695 if (!Signature::is_method(signature)) {
696 throwIllegalSignature("Method", name, signature, CHECK);
697 }
698 }
699 // If a class method name begins with '<', it must be "<init>" and have void signature.
700 const unsigned int name_len = name->utf8_length();
701 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
702 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
703 if (name != vmSymbols::object_initializer_name()) {
704 classfile_parse_error(
705 "Bad method name at constant pool index %u in class file %s",
706 name_ref_index, THREAD);
707 return;
708 } else if (!Signature::is_void_method(signature)) { // must have void signature.
709 throwIllegalSignature("Method", name, signature, CHECK);
710 }
711 }
712 }
713 break;
714 }
715 case JVM_CONSTANT_MethodHandle: {
716 const int ref_index = cp->method_handle_index_at(index);
717 const int ref_kind = cp->method_handle_ref_kind_at(index);
718 switch (ref_kind) {
719 case JVM_REF_invokeVirtual:
720 case JVM_REF_invokeStatic:
721 case JVM_REF_invokeSpecial:
722 case JVM_REF_newInvokeSpecial: {
723 const int name_and_type_ref_index =
724 cp->uncached_name_and_type_ref_index_at(ref_index);
725 const int name_ref_index =
726 cp->name_ref_index_at(name_and_type_ref_index);
727 const Symbol* const name = cp->symbol_at(name_ref_index);
728 if (ref_kind == JVM_REF_newInvokeSpecial) {
729 if (name != vmSymbols::object_initializer_name()) {
730 classfile_parse_error(
731 "Bad constructor name at constant pool index %u in class file %s",
732 name_ref_index, THREAD);
733 return;
734 }
735 } else {
736 if (name == vmSymbols::object_initializer_name()) {
737 classfile_parse_error(
738 "Bad method name at constant pool index %u in class file %s",
739 name_ref_index, THREAD);
740 return;
741 }
742 }
743 break;
744 }
745 // Other ref_kinds are already fully checked in previous pass.
746 } // switch(ref_kind)
747 break;
748 }
749 case JVM_CONSTANT_MethodType: {
750 const Symbol* const no_name = vmSymbols::type_name(); // place holder
751 const Symbol* const signature = cp->method_type_signature_at(index);
752 verify_legal_method_signature(no_name, signature, CHECK);
753 break;
754 }
755 case JVM_CONSTANT_Utf8: {
756 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
757 }
758 } // switch(tag)
759 } // end of for
760 }
761
762 class NameSigHash: public ResourceObj {
763 public:
764 const Symbol* _name; // name
765 const Symbol* _sig; // signature
766
767 static const int HASH_ROW_SIZE = 256;
768
769 NameSigHash(Symbol* name, Symbol* sig) :
770 _name(name),
771 _sig(sig) {}
772
773 static unsigned int hash(NameSigHash const& namesig) {
774 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
775 }
776
777 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
778 return (e0._name == e1._name) &&
779 (e0._sig == e1._sig);
780 }
781 };
782
783 using NameSigHashtable = HashTable<NameSigHash, int,
784 NameSigHash::HASH_ROW_SIZE,
785 AnyObj::RESOURCE_AREA, mtInternal,
786 &NameSigHash::hash, &NameSigHash::equals>;
787
788 // Side-effects: populates the _local_interfaces field
789 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
790 const int itfs_len,
791 ConstantPool* const cp,
792 bool* const has_nonstatic_concrete_methods,
793 TRAPS) {
794 assert(stream != nullptr, "invariant");
795 assert(cp != nullptr, "invariant");
796 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
797
798 if (itfs_len == 0) {
799 _local_interfaces = Universe::the_empty_instance_klass_array();
800 } else {
801 assert(itfs_len > 0, "only called for len>0");
802 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
803
804 int index;
805 for (index = 0; index < itfs_len; index++) {
806 const u2 interface_index = stream->get_u2(CHECK);
807 Klass* interf;
808 guarantee_property(
809 valid_klass_reference_at(interface_index),
810 "Interface name has bad constant pool index %u in class file %s",
811 interface_index, CHECK);
812 if (cp->tag_at(interface_index).is_klass()) {
813 interf = cp->resolved_klass_at(interface_index);
814 } else {
815 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
816
817 // Don't need to check legal name because it's checked when parsing constant pool.
818 // But need to make sure it's not an array type.
819 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
820 "Bad interface name in class file %s", CHECK);
821
822 // Call resolve on the interface class name with class circularity checking
823 interf = SystemDictionary::resolve_super_or_fail(_class_name,
824 unresolved_klass,
825 Handle(THREAD, _loader_data->class_loader()),
826 false, CHECK);
827 }
828
829 if (!interf->is_interface()) {
830 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
831 err_msg("class %s can not implement %s, because it is not an interface (%s)",
832 _class_name->as_klass_external_name(),
833 interf->external_name(),
834 interf->class_in_module_of_loader()));
835 }
836
837 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
838 *has_nonstatic_concrete_methods = true;
839 }
840 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
841 }
842
843 if (!_need_verify || itfs_len <= 1) {
844 return;
845 }
846
847 // Check if there's any duplicates in interfaces
848 ResourceMark rm(THREAD);
849 // Set containing interface names
850 HashTable<Symbol*, int>* interface_names = new HashTable<Symbol*, int>();
851 for (index = 0; index < itfs_len; index++) {
852 const InstanceKlass* const k = _local_interfaces->at(index);
853 Symbol* interface_name = k->name();
854 // If no duplicates, add (name, nullptr) in hashtable interface_names.
855 if (!interface_names->put(interface_name, 0)) {
856 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
857 interface_name->as_C_string(), THREAD);
858 return;
859 }
860 }
861 }
862 }
863
864 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
865 int constantvalue_index,
866 int signature_index,
867 TRAPS) const {
868 // Make sure the constant pool entry is of a type appropriate to this field
869 guarantee_property(
870 (constantvalue_index > 0 &&
871 constantvalue_index < cp->length()),
872 "Bad initial value index %u in ConstantValue attribute in class file %s",
873 constantvalue_index, CHECK);
874
875 const constantTag value_type = cp->tag_at(constantvalue_index);
876 switch(cp->basic_type_for_signature_at(signature_index)) {
877 case T_LONG: {
878 guarantee_property(value_type.is_long(),
879 "Inconsistent constant value type in class file %s",
880 CHECK);
881 break;
882 }
883 case T_FLOAT: {
884 guarantee_property(value_type.is_float(),
885 "Inconsistent constant value type in class file %s",
886 CHECK);
887 break;
888 }
889 case T_DOUBLE: {
890 guarantee_property(value_type.is_double(),
891 "Inconsistent constant value type in class file %s",
892 CHECK);
893 break;
894 }
895 case T_BYTE:
896 case T_CHAR:
897 case T_SHORT:
898 case T_BOOLEAN:
899 case T_INT: {
900 guarantee_property(value_type.is_int(),
901 "Inconsistent constant value type in class file %s",
902 CHECK);
903 break;
904 }
905 case T_OBJECT: {
906 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
907 && value_type.is_string()),
908 "Bad string initial value in class file %s",
909 CHECK);
910 break;
911 }
912 default: {
913 classfile_parse_error("Unable to set initial value %u in class file %s",
914 constantvalue_index,
915 THREAD);
916 }
917 }
918 }
919
920 class AnnotationCollector : public ResourceObj{
921 public:
922 enum Location { _in_field, _in_method, _in_class };
923 enum ID {
924 _unknown = 0,
925 _method_CallerSensitive,
926 _method_ForceInline,
927 _method_DontInline,
928 _method_ChangesCurrentThread,
929 _method_JvmtiHideEvents,
930 _method_JvmtiMountTransition,
931 _method_InjectedProfile,
932 _method_LambdaForm_Compiled,
933 _method_Hidden,
934 _method_Scoped,
935 _method_IntrinsicCandidate,
936 _jdk_internal_vm_annotation_Contended,
937 _field_Stable,
938 _jdk_internal_vm_annotation_ReservedStackAccess,
939 _jdk_internal_ValueBased,
940 _java_lang_Deprecated,
941 _java_lang_Deprecated_for_removal,
942 _jdk_internal_vm_annotation_AOTSafeClassInitializer,
943 _method_AOTRuntimeSetup,
944 _jdk_internal_vm_annotation_TrustFinalFields,
945 _annotation_LIMIT
946 };
947 const Location _location;
948 int _annotations_present;
949 u2 _contended_group;
950
951 AnnotationCollector(Location location)
952 : _location(location), _annotations_present(0), _contended_group(0)
953 {
954 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
955 }
956 // If this annotation name has an ID, report it (or _none).
957 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
958 // Set the annotation name:
959 void set_annotation(ID id) {
960 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
961 _annotations_present |= (int)nth_bit((int)id);
962 }
963
964 void remove_annotation(ID id) {
965 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
966 _annotations_present &= (int)~nth_bit((int)id);
967 }
968
969 // Report if the annotation is present.
970 bool has_any_annotations() const { return _annotations_present != 0; }
971 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
972
973 void set_contended_group(u2 group) { _contended_group = group; }
974 u2 contended_group() const { return _contended_group; }
975
976 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
977
978 void set_stable(bool stable) { set_annotation(_field_Stable); }
979 bool is_stable() const { return has_annotation(_field_Stable); }
980
981 bool has_aot_runtime_setup() const { return has_annotation(_method_AOTRuntimeSetup); }
982 };
983
984 // This class also doubles as a holder for metadata cleanup.
985 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
986 private:
987 ClassLoaderData* _loader_data;
988 AnnotationArray* _field_annotations;
989 AnnotationArray* _field_type_annotations;
990 public:
991 FieldAnnotationCollector(ClassLoaderData* loader_data) :
992 AnnotationCollector(_in_field),
993 _loader_data(loader_data),
994 _field_annotations(nullptr),
995 _field_type_annotations(nullptr) {}
996 ~FieldAnnotationCollector();
997 void apply_to(FieldInfo* f);
998 AnnotationArray* field_annotations() { return _field_annotations; }
999 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1000
1001 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1002 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1003 };
1004
1005 class MethodAnnotationCollector : public AnnotationCollector{
1006 public:
1007 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1008 void apply_to(const methodHandle& m);
1009 };
1010
1011 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1012 public:
1013 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1014 void apply_to(InstanceKlass* ik);
1015 };
1016
1017
1018 static int skip_annotation_value(const u1* buffer, int limit, int index, int recursion_depth); // fwd decl
1019 static const int max_recursion_depth = 5;
1020
1021 // Safely increment index by val if does not pass limit
1022 #define SAFE_ADD(index, limit, val) \
1023 if (index >= limit - val) return limit; \
1024 index += val;
1025
1026 // Skip an annotation. Return >=limit if there is any problem.
1027 static int skip_annotation(const u1* buffer, int limit, int index, int recursion_depth = 0) {
1028 assert(buffer != nullptr, "invariant");
1029 if (recursion_depth > max_recursion_depth) {
1030 return limit;
1031 }
1032 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1033 // value := switch (tag:u1) { ... }
1034 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1035 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1036 while (--nmem >= 0 && index < limit) {
1037 SAFE_ADD(index, limit, 2); // skip member
1038 index = skip_annotation_value(buffer, limit, index, recursion_depth + 1);
1039 }
1040 return index;
1041 }
1042
1043 // Skip an annotation value. Return >=limit if there is any problem.
1044 static int skip_annotation_value(const u1* buffer, int limit, int index, int recursion_depth) {
1045 assert(buffer != nullptr, "invariant");
1046
1047 if (recursion_depth > max_recursion_depth) {
1048 return limit;
1049 }
1050 // value := switch (tag:u1) {
1051 // case B, C, I, S, Z, D, F, J, c: con:u2;
1052 // case e: e_class:u2 e_name:u2;
1053 // case s: s_con:u2;
1054 // case [: do(nval:u2) {value};
1055 // case @: annotation;
1056 // case s: s_con:u2;
1057 // }
1058 SAFE_ADD(index, limit, 1); // read tag
1059 const u1 tag = buffer[index - 1];
1060 switch (tag) {
1061 case 'B':
1062 case 'C':
1063 case 'I':
1064 case 'S':
1065 case 'Z':
1066 case 'D':
1067 case 'F':
1068 case 'J':
1069 case 'c':
1070 case 's':
1071 SAFE_ADD(index, limit, 2); // skip con or s_con
1072 break;
1073 case 'e':
1074 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1075 break;
1076 case '[':
1077 {
1078 SAFE_ADD(index, limit, 2); // read nval
1079 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1080 while (--nval >= 0 && index < limit) {
1081 index = skip_annotation_value(buffer, limit, index, recursion_depth + 1);
1082 }
1083 }
1084 break;
1085 case '@':
1086 index = skip_annotation(buffer, limit, index, recursion_depth + 1);
1087 break;
1088 default:
1089 return limit; // bad tag byte
1090 }
1091 return index;
1092 }
1093
1094 // Sift through annotations, looking for those significant to the VM:
1095 static void parse_annotations(const ConstantPool* const cp,
1096 const u1* buffer, int limit,
1097 AnnotationCollector* coll,
1098 ClassLoaderData* loader_data,
1099 const bool can_access_vm_annotations) {
1100
1101 assert(cp != nullptr, "invariant");
1102 assert(buffer != nullptr, "invariant");
1103 assert(coll != nullptr, "invariant");
1104 assert(loader_data != nullptr, "invariant");
1105
1106 // annotations := do(nann:u2) {annotation}
1107 int index = 2; // read nann
1108 if (index >= limit) return;
1109 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1110 enum { // initial annotation layout
1111 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1112 count_off = 2, // u2 such as 1 (one value)
1113 member_off = 4, // utf8 such as 'value'
1114 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1115 e_tag_val = 'e',
1116 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1117 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1118 e_size = 11, // end of 'e' annotation
1119 c_tag_val = 'c', // payload is type
1120 c_con_off = 7, // utf8 payload, such as 'I'
1121 c_size = 9, // end of 'c' annotation
1122 s_tag_val = 's', // payload is String
1123 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1124 s_size = 9,
1125 b_tag_val = 'Z', // payload is boolean
1126 min_size = 6 // smallest possible size (zero members)
1127 };
1128 // Cannot add min_size to index in case of overflow MAX_INT
1129 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1130 int index0 = index;
1131 index = skip_annotation(buffer, limit, index);
1132 const u1* const abase = buffer + index0;
1133 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1134 const int count = Bytes::get_Java_u2((address)abase + count_off);
1135 const Symbol* const aname = check_symbol_at(cp, atype);
1136 if (aname == nullptr) break; // invalid annotation name
1137 const Symbol* member = nullptr;
1138 if (count >= 1) {
1139 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1140 member = check_symbol_at(cp, member_index);
1141 if (member == nullptr) break; // invalid member name
1142 }
1143
1144 // Here is where parsing particular annotations will take place.
1145 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1146 if (AnnotationCollector::_unknown == id) continue;
1147 coll->set_annotation(id);
1148 if (AnnotationCollector::_java_lang_Deprecated == id) {
1149 // @Deprecated can specify forRemoval=true, which we need
1150 // to record for JFR to use. If the annotation is not well-formed
1151 // then we may not be able to determine that.
1152 const u1* offset = abase + member_off;
1153 // There are only 2 members in @Deprecated.
1154 int n_members = MIN2(count, 2);
1155 for (int i = 0; i < n_members; ++i) {
1156 int member_index = Bytes::get_Java_u2((address)offset);
1157 offset += 2;
1158 member = check_symbol_at(cp, member_index);
1159 if (member == vmSymbols::since() &&
1160 (*((address)offset) == s_tag_val)) {
1161 // Found `since` first so skip over it
1162 offset += 3;
1163 }
1164 else if (member == vmSymbols::for_removal() &&
1165 (*((address)offset) == b_tag_val)) {
1166 const u2 boolean_value_index = Bytes::get_Java_u2((address)offset + 1);
1167 // No guarantee the entry is valid so check it refers to an int in the CP.
1168 if (cp->is_within_bounds(boolean_value_index) &&
1169 cp->tag_at(boolean_value_index).is_int() &&
1170 cp->int_at(boolean_value_index) == 1) {
1171 // forRemoval == true
1172 coll->set_annotation(AnnotationCollector::_java_lang_Deprecated_for_removal);
1173 }
1174 break; // no need to check further
1175 }
1176 else {
1177 // This @Deprecated annotation is malformed so we don't try to
1178 // determine whether forRemoval is set.
1179 break;
1180 }
1181 }
1182 continue; // proceed to next annotation
1183 }
1184
1185 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1186 // @Contended can optionally specify the contention group.
1187 //
1188 // Contended group defines the equivalence class over the fields:
1189 // the fields within the same contended group are not treated distinct.
1190 // The only exception is default group, which does not incur the
1191 // equivalence. Naturally, contention group for classes is meaningless.
1192 //
1193 // While the contention group is specified as String, annotation
1194 // values are already interned, and we might as well use the constant
1195 // pool index as the group tag.
1196 //
1197 u2 group_index = 0; // default contended group
1198 if (count == 1
1199 && s_size == (index - index0) // match size
1200 && s_tag_val == *(abase + tag_off)
1201 && member == vmSymbols::value_name()) {
1202 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1203 // No guarantee the group_index is valid so check it refers to a
1204 // symbol in the CP.
1205 if (cp->is_within_bounds(group_index) &&
1206 cp->tag_at(group_index).is_utf8()) {
1207 // Seems valid, so check for empty string and reset
1208 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1209 group_index = 0; // default contended group
1210 }
1211 } else {
1212 // Not valid so use the default
1213 group_index = 0;
1214 }
1215 }
1216 coll->set_contended_group(group_index);
1217 continue; // proceed to next annotation
1218 }
1219 }
1220 }
1221
1222
1223 // Parse attributes for a field.
1224 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1225 u2 attributes_count,
1226 bool is_static, u2 signature_index,
1227 u2* const constantvalue_index_addr,
1228 bool* const is_synthetic_addr,
1229 u2* const generic_signature_index_addr,
1230 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1231 TRAPS) {
1232 assert(cfs != nullptr, "invariant");
1233 assert(constantvalue_index_addr != nullptr, "invariant");
1234 assert(is_synthetic_addr != nullptr, "invariant");
1235 assert(generic_signature_index_addr != nullptr, "invariant");
1236 assert(parsed_annotations != nullptr, "invariant");
1237 assert(attributes_count > 0, "attributes_count should be greater than 0");
1238
1239 u2 constantvalue_index = 0;
1240 u2 generic_signature_index = 0;
1241 bool is_synthetic = false;
1242 const u1* runtime_visible_annotations = nullptr;
1243 int runtime_visible_annotations_length = 0;
1244 const u1* runtime_visible_type_annotations = nullptr;
1245 int runtime_visible_type_annotations_length = 0;
1246 bool runtime_invisible_annotations_exists = false;
1247 bool runtime_invisible_type_annotations_exists = false;
1248 const ConstantPool* const cp = _cp;
1249
1250 while (attributes_count--) {
1251 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1252 const u2 attribute_name_index = cfs->get_u2_fast();
1253 const u4 attribute_length = cfs->get_u4_fast();
1254 guarantee_property(valid_symbol_at(attribute_name_index),
1255 "Invalid field attribute index %u in class file %s",
1256 attribute_name_index,
1257 CHECK);
1258
1259 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1260 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1261 // ignore if non-static
1262 if (constantvalue_index != 0) {
1263 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
1264 return;
1265 }
1266 guarantee_property(
1267 attribute_length == 2,
1268 "Invalid ConstantValue field attribute length %u in class file %s",
1269 attribute_length, CHECK);
1270
1271 constantvalue_index = cfs->get_u2(CHECK);
1272 if (_need_verify) {
1273 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1274 }
1275 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1276 if (attribute_length != 0) {
1277 classfile_parse_error(
1278 "Invalid Synthetic field attribute length %u in class file %s",
1279 attribute_length, THREAD);
1280 return;
1281 }
1282 is_synthetic = true;
1283 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1284 if (attribute_length != 0) {
1285 classfile_parse_error(
1286 "Invalid Deprecated field attribute length %u in class file %s",
1287 attribute_length, THREAD);
1288 return;
1289 }
1290 } else if (_major_version >= JAVA_1_5_VERSION) {
1291 if (attribute_name == vmSymbols::tag_signature()) {
1292 if (generic_signature_index != 0) {
1293 classfile_parse_error(
1294 "Multiple Signature attributes for field in class file %s", THREAD);
1295 return;
1296 }
1297 if (attribute_length != 2) {
1298 classfile_parse_error(
1299 "Wrong size %u for field's Signature attribute in class file %s",
1300 attribute_length, THREAD);
1301 return;
1302 }
1303 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1304 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1305 if (runtime_visible_annotations != nullptr) {
1306 classfile_parse_error(
1307 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
1308 return;
1309 }
1310 runtime_visible_annotations_length = attribute_length;
1311 runtime_visible_annotations = cfs->current();
1312 assert(runtime_visible_annotations != nullptr, "null visible annotations");
1313 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1314 parse_annotations(cp,
1315 runtime_visible_annotations,
1316 runtime_visible_annotations_length,
1317 parsed_annotations,
1318 _loader_data,
1319 _can_access_vm_annotations);
1320 cfs->skip_u1_fast(runtime_visible_annotations_length);
1321 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1322 if (runtime_invisible_annotations_exists) {
1323 classfile_parse_error(
1324 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
1325 return;
1326 }
1327 runtime_invisible_annotations_exists = true;
1328 cfs->skip_u1(attribute_length, CHECK);
1329 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1330 if (runtime_visible_type_annotations != nullptr) {
1331 classfile_parse_error(
1332 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
1333 return;
1334 }
1335 runtime_visible_type_annotations_length = attribute_length;
1336 runtime_visible_type_annotations = cfs->current();
1337 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
1338 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1339 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1340 if (runtime_invisible_type_annotations_exists) {
1341 classfile_parse_error(
1342 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
1343 return;
1344 } else {
1345 runtime_invisible_type_annotations_exists = true;
1346 }
1347 cfs->skip_u1(attribute_length, CHECK);
1348 } else {
1349 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1350 }
1351 } else {
1352 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1353 }
1354 }
1355
1356 *constantvalue_index_addr = constantvalue_index;
1357 *is_synthetic_addr = is_synthetic;
1358 *generic_signature_index_addr = generic_signature_index;
1359 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1360 runtime_visible_annotations_length,
1361 CHECK);
1362 parsed_annotations->set_field_annotations(a);
1363 a = allocate_annotations(runtime_visible_type_annotations,
1364 runtime_visible_type_annotations_length,
1365 CHECK);
1366 parsed_annotations->set_field_type_annotations(a);
1367 return;
1368 }
1369
1370
1371 // Side-effects: populates the _fields, _fields_annotations,
1372 // _fields_type_annotations fields
1373 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1374 bool is_interface,
1375 ConstantPool* cp,
1376 const int cp_size,
1377 u2* const java_fields_count_ptr,
1378 TRAPS) {
1379
1380 assert(cfs != nullptr, "invariant");
1381 assert(cp != nullptr, "invariant");
1382 assert(java_fields_count_ptr != nullptr, "invariant");
1383
1384 assert(nullptr == _fields_annotations, "invariant");
1385 assert(nullptr == _fields_type_annotations, "invariant");
1386
1387 cfs->guarantee_more(2, CHECK); // length
1388 const u2 length = cfs->get_u2_fast();
1389 *java_fields_count_ptr = length;
1390
1391 int num_injected = 0;
1392 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1393 &num_injected);
1394 const int total_fields = length + num_injected;
1395
1396 // Allocate a temporary resource array to collect field data.
1397 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1398 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1399
1400 ResourceMark rm(THREAD);
1401 for (int n = 0; n < length; n++) {
1402 // access_flags, name_index, descriptor_index, attributes_count
1403 cfs->guarantee_more(8, CHECK);
1404
1405 AccessFlags access_flags;
1406 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1407 verify_legal_field_modifiers(flags, is_interface, CHECK);
1408 access_flags.set_flags(flags);
1409 FieldInfo::FieldFlags fieldFlags(0);
1410
1411 const u2 name_index = cfs->get_u2_fast();
1412 guarantee_property(valid_symbol_at(name_index),
1413 "Invalid constant pool index %u for field name in class file %s",
1414 name_index, CHECK);
1415 const Symbol* const name = cp->symbol_at(name_index);
1416 verify_legal_field_name(name, CHECK);
1417
1418 const u2 signature_index = cfs->get_u2_fast();
1419 guarantee_property(valid_symbol_at(signature_index),
1420 "Invalid constant pool index %u for field signature in class file %s",
1421 signature_index, CHECK);
1422 const Symbol* const sig = cp->symbol_at(signature_index);
1423 verify_legal_field_signature(name, sig, CHECK);
1424
1425 u2 constantvalue_index = 0;
1426 bool is_synthetic = false;
1427 u2 generic_signature_index = 0;
1428 const bool is_static = access_flags.is_static();
1429 FieldAnnotationCollector parsed_annotations(_loader_data);
1430
1431 const u2 attributes_count = cfs->get_u2_fast();
1432 if (attributes_count > 0) {
1433 parse_field_attributes(cfs,
1434 attributes_count,
1435 is_static,
1436 signature_index,
1437 &constantvalue_index,
1438 &is_synthetic,
1439 &generic_signature_index,
1440 &parsed_annotations,
1441 CHECK);
1442
1443 if (parsed_annotations.field_annotations() != nullptr) {
1444 if (_fields_annotations == nullptr) {
1445 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1446 _loader_data, length, nullptr,
1447 CHECK);
1448 }
1449 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1450 parsed_annotations.set_field_annotations(nullptr);
1451 }
1452 if (parsed_annotations.field_type_annotations() != nullptr) {
1453 if (_fields_type_annotations == nullptr) {
1454 _fields_type_annotations =
1455 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1456 length,
1457 nullptr,
1458 CHECK);
1459 }
1460 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1461 parsed_annotations.set_field_type_annotations(nullptr);
1462 }
1463
1464 if (is_synthetic) {
1465 access_flags.set_is_synthetic();
1466 }
1467 if (generic_signature_index != 0) {
1468 fieldFlags.update_generic(true);
1469 }
1470 }
1471
1472 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1473
1474 // Update number of static oop fields.
1475 if (is_static && is_reference_type(type)) {
1476 _static_oop_count++;
1477 }
1478
1479 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1480 fi.set_index(n);
1481 if (fieldFlags.is_generic()) {
1482 fi.set_generic_signature_index(generic_signature_index);
1483 }
1484 parsed_annotations.apply_to(&fi);
1485 if (fi.field_flags().is_contended()) {
1486 _has_contended_fields = true;
1487 }
1488 _temp_field_info->append(fi);
1489 }
1490 assert(_temp_field_info->length() == length, "Must be");
1491
1492 int index = length;
1493 if (num_injected != 0) {
1494 for (int n = 0; n < num_injected; n++) {
1495 // Check for duplicates
1496 if (injected[n].may_be_java) {
1497 const Symbol* const name = injected[n].name();
1498 const Symbol* const signature = injected[n].signature();
1499 bool duplicate = false;
1500 for (int i = 0; i < length; i++) {
1501 const FieldInfo* const f = _temp_field_info->adr_at(i);
1502 if (name == cp->symbol_at(f->name_index()) &&
1503 signature == cp->symbol_at(f->signature_index())) {
1504 // Symbol is desclared in Java so skip this one
1505 duplicate = true;
1506 break;
1507 }
1508 }
1509 if (duplicate) {
1510 // These will be removed from the field array at the end
1511 continue;
1512 }
1513 }
1514
1515 // Injected field
1516 FieldInfo::FieldFlags fflags(0);
1517 fflags.update_injected(true);
1518 AccessFlags aflags;
1519 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1520 fi.set_index(index);
1521 _temp_field_info->append(fi);
1522 index++;
1523 }
1524 }
1525
1526 assert(_temp_field_info->length() == index, "Must be");
1527
1528 if (_need_verify && length > 1) {
1529 // Check duplicated fields
1530 ResourceMark rm(THREAD);
1531 // Set containing name-signature pairs
1532 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1533 for (int i = 0; i < _temp_field_info->length(); i++) {
1534 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1535 _temp_field_info->adr_at(i)->signature(_cp));
1536 // If no duplicates, add name/signature in hashtable names_and_sigs.
1537 if(!names_and_sigs->put(name_and_sig, 0)) {
1538 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1539 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1540 return;
1541 }
1542 }
1543 }
1544 }
1545
1546
1547 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1548 u4 code_length,
1549 u4 exception_table_length,
1550 TRAPS) {
1551 assert(cfs != nullptr, "invariant");
1552
1553 const unsafe_u2* const exception_table_start = cfs->current();
1554 assert(exception_table_start != nullptr, "null exception table");
1555
1556 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1557 // end_pc,
1558 // handler_pc,
1559 // catch_type_index
1560
1561 // Will check legal target after parsing code array in verifier.
1562 if (_need_verify) {
1563 for (unsigned int i = 0; i < exception_table_length; i++) {
1564 const u2 start_pc = cfs->get_u2_fast();
1565 const u2 end_pc = cfs->get_u2_fast();
1566 const u2 handler_pc = cfs->get_u2_fast();
1567 const u2 catch_type_index = cfs->get_u2_fast();
1568 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1569 "Illegal exception table range in class file %s",
1570 CHECK_NULL);
1571 guarantee_property(handler_pc < code_length,
1572 "Illegal exception table handler in class file %s",
1573 CHECK_NULL);
1574 if (catch_type_index != 0) {
1575 guarantee_property(valid_klass_reference_at(catch_type_index),
1576 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1577 }
1578 }
1579 } else {
1580 cfs->skip_u2_fast(exception_table_length * 4);
1581 }
1582 return exception_table_start;
1583 }
1584
1585 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1586 u4 code_length,
1587 CompressedLineNumberWriteStream**const write_stream,
1588 TRAPS) {
1589
1590 const ClassFileStream* const cfs = _stream;
1591 unsigned int num_entries = cfs->get_u2(CHECK);
1592
1593 // Each entry is a u2 start_pc, and a u2 line_number
1594 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1595
1596 // Verify line number attribute and table length
1597 guarantee_property(
1598 code_attribute_length == sizeof(u2) + length_in_bytes,
1599 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1600
1601 cfs->guarantee_more(length_in_bytes, CHECK);
1602
1603 if ((*write_stream) == nullptr) {
1604 if (length_in_bytes > fixed_buffer_size) {
1605 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1606 } else {
1607 (*write_stream) = new CompressedLineNumberWriteStream(
1608 _linenumbertable_buffer, fixed_buffer_size);
1609 }
1610 }
1611
1612 while (num_entries-- > 0) {
1613 const u2 bci = cfs->get_u2_fast(); // start_pc
1614 const u2 line = cfs->get_u2_fast(); // line_number
1615 guarantee_property(bci < code_length,
1616 "Invalid pc in LineNumberTable in class file %s", CHECK);
1617 (*write_stream)->write_pair(bci, line);
1618 }
1619 }
1620
1621
1622 class LVT_Hash : public AllStatic {
1623 public:
1624
1625 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1626 /*
1627 * 3-tuple start_bci/length/slot has to be unique key,
1628 * so the following comparison seems to be redundant:
1629 * && elem->name_cp_index == entry->_elem->name_cp_index
1630 */
1631 return (e0.start_bci == e1.start_bci &&
1632 e0.length == e1.length &&
1633 e0.name_cp_index == e1.name_cp_index &&
1634 e0.slot == e1.slot);
1635 }
1636
1637 static unsigned int hash(LocalVariableTableElement const& e0) {
1638 unsigned int raw_hash = e0.start_bci;
1639
1640 raw_hash = e0.length + raw_hash * 37;
1641 raw_hash = e0.name_cp_index + raw_hash * 37;
1642 raw_hash = e0.slot + raw_hash * 37;
1643
1644 return raw_hash;
1645 }
1646 };
1647
1648
1649 // Class file LocalVariableTable elements.
1650 class Classfile_LVT_Element {
1651 public:
1652 u2 start_bci;
1653 u2 length;
1654 u2 name_cp_index;
1655 u2 descriptor_cp_index;
1656 u2 slot;
1657 };
1658
1659 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1660 LocalVariableTableElement* const lvt) {
1661 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1662 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1663 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1664 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1665 lvt->signature_cp_index = 0;
1666 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1667 }
1668
1669 // Function is used to parse both attributes:
1670 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1671 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1672 u4 code_length,
1673 u2 max_locals,
1674 u4 code_attribute_length,
1675 u2* const localvariable_table_length,
1676 bool isLVTT,
1677 TRAPS) {
1678 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1679 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1680 const unsigned int size = checked_cast<unsigned>(
1681 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2));
1682
1683 const ConstantPool* const cp = _cp;
1684
1685 // Verify local variable table attribute has right length
1686 if (_need_verify) {
1687 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1688 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1689 }
1690
1691 const unsafe_u2* const localvariable_table_start = cfs->current();
1692 assert(localvariable_table_start != nullptr, "null local variable table");
1693 if (!_need_verify) {
1694 cfs->skip_u2_fast(size);
1695 } else {
1696 cfs->guarantee_more(size * 2, CHECK_NULL);
1697 for(int i = 0; i < (*localvariable_table_length); i++) {
1698 const u2 start_pc = cfs->get_u2_fast();
1699 const u2 length = cfs->get_u2_fast();
1700 const u2 name_index = cfs->get_u2_fast();
1701 const u2 descriptor_index = cfs->get_u2_fast();
1702 const u2 index = cfs->get_u2_fast();
1703 // Assign to a u4 to avoid overflow
1704 const u4 end_pc = (u4)start_pc + (u4)length;
1705
1706 if (start_pc >= code_length) {
1707 classfile_parse_error(
1708 "Invalid start_pc %u in %s in class file %s",
1709 start_pc, tbl_name, THREAD);
1710 return nullptr;
1711 }
1712 if (end_pc > code_length) {
1713 classfile_parse_error(
1714 "Invalid length %u in %s in class file %s",
1715 length, tbl_name, THREAD);
1716 return nullptr;
1717 }
1718 const int cp_size = cp->length();
1719 guarantee_property(valid_symbol_at(name_index),
1720 "Name index %u in %s has bad constant type in class file %s",
1721 name_index, tbl_name, CHECK_NULL);
1722 guarantee_property(valid_symbol_at(descriptor_index),
1723 "Signature index %u in %s has bad constant type in class file %s",
1724 descriptor_index, tbl_name, CHECK_NULL);
1725
1726 const Symbol* const name = cp->symbol_at(name_index);
1727 const Symbol* const sig = cp->symbol_at(descriptor_index);
1728 verify_legal_field_name(name, CHECK_NULL);
1729 u2 extra_slot = 0;
1730 if (!isLVTT) {
1731 verify_legal_field_signature(name, sig, CHECK_NULL);
1732
1733 // 4894874: check special cases for double and long local variables
1734 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1735 sig == vmSymbols::type_signature(T_LONG)) {
1736 extra_slot = 1;
1737 }
1738 }
1739 guarantee_property((index + extra_slot) < max_locals,
1740 "Invalid index %u in %s in class file %s",
1741 index, tbl_name, CHECK_NULL);
1742 }
1743 }
1744 return localvariable_table_start;
1745 }
1746
1747 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1748 u4 code_attribute_length,
1749 TRAPS) {
1750 assert(cfs != nullptr, "invariant");
1751
1752 if (0 == code_attribute_length) {
1753 return nullptr;
1754 }
1755
1756 const u1* const stackmap_table_start = cfs->current();
1757 assert(stackmap_table_start != nullptr, "null stackmap table");
1758
1759 // check code_attribute_length
1760 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1761
1762 return stackmap_table_start;
1763 }
1764
1765 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1766 u2* const checked_exceptions_length,
1767 u4 method_attribute_length,
1768 TRAPS) {
1769 assert(cfs != nullptr, "invariant");
1770 assert(checked_exceptions_length != nullptr, "invariant");
1771
1772 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1773 *checked_exceptions_length = cfs->get_u2_fast();
1774 const unsigned int size =
1775 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1776 const unsafe_u2* const checked_exceptions_start = cfs->current();
1777 assert(checked_exceptions_start != nullptr, "null checked exceptions");
1778 if (!_need_verify) {
1779 cfs->skip_u2_fast(size);
1780 } else {
1781 // Verify each value in the checked exception table
1782 u2 checked_exception;
1783 const u2 len = *checked_exceptions_length;
1784 cfs->guarantee_more(2 * len, CHECK_NULL);
1785 for (int i = 0; i < len; i++) {
1786 checked_exception = cfs->get_u2_fast();
1787 guarantee_property(
1788 valid_klass_reference_at(checked_exception),
1789 "Exception name has bad type at constant pool %u in class file %s",
1790 checked_exception, CHECK_NULL);
1791 }
1792 }
1793 // check exceptions attribute length
1794 if (_need_verify) {
1795 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1796 sizeof(u2) * size),
1797 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1798 }
1799 return checked_exceptions_start;
1800 }
1801
1802 void ClassFileParser::throwIllegalSignature(const char* type,
1803 const Symbol* name,
1804 const Symbol* sig,
1805 TRAPS) const {
1806 assert(name != nullptr, "invariant");
1807 assert(sig != nullptr, "invariant");
1808
1809 ResourceMark rm(THREAD);
1810 // Names are all known to be < 64k so we know this formatted message is not excessively large.
1811 Exceptions::fthrow(THREAD_AND_LOCATION,
1812 vmSymbols::java_lang_ClassFormatError(),
1813 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1814 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1815 }
1816
1817 AnnotationCollector::ID
1818 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1819 const Symbol* name,
1820 const bool can_access_vm_annotations) {
1821 const vmSymbolID sid = vmSymbols::find_sid(name);
1822 // Privileged code can use all annotations. Other code silently drops some.
1823 const bool privileged = loader_data->is_boot_class_loader_data() ||
1824 loader_data->is_platform_class_loader_data() ||
1825 can_access_vm_annotations;
1826 switch (sid) {
1827 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1828 if (_location != _in_method) break; // only allow for methods
1829 if (!privileged) break; // only allow in privileged code
1830 return _method_CallerSensitive;
1831 }
1832 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1833 if (_location != _in_method) break; // only allow for methods
1834 if (!privileged) break; // only allow in privileged code
1835 return _method_ForceInline;
1836 }
1837 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
1838 if (_location != _in_method) break; // only allow for methods
1839 if (!privileged) break; // only allow in privileged code
1840 return _method_DontInline;
1841 }
1842 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
1843 if (_location != _in_method) break; // only allow for methods
1844 if (!privileged) break; // only allow in privileged code
1845 return _method_ChangesCurrentThread;
1846 }
1847 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiHideEvents_signature): {
1848 if (_location != _in_method) break; // only allow for methods
1849 if (!privileged) break; // only allow in privileged code
1850 return _method_JvmtiHideEvents;
1851 }
1852 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
1853 if (_location != _in_method) break; // only allow for methods
1854 if (!privileged) break; // only allow in privileged code
1855 return _method_JvmtiMountTransition;
1856 }
1857 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
1858 if (_location != _in_method) break; // only allow for methods
1859 if (!privileged) break; // only allow in privileged code
1860 return _method_InjectedProfile;
1861 }
1862 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
1863 if (_location != _in_method) break; // only allow for methods
1864 if (!privileged) break; // only allow in privileged code
1865 return _method_LambdaForm_Compiled;
1866 }
1867 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
1868 if (_location != _in_method) break; // only allow for methods
1869 if (!privileged) break; // only allow in privileged code
1870 return _method_Hidden;
1871 }
1872 case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
1873 if (_location != _in_method) break; // only allow for methods
1874 if (!privileged) break; // only allow in privileged code
1875 return _method_Scoped;
1876 }
1877 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
1878 if (_location != _in_method) break; // only allow for methods
1879 if (!privileged) break; // only allow in privileged code
1880 return _method_IntrinsicCandidate;
1881 }
1882 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
1883 if (_location != _in_field) break; // only allow for fields
1884 if (!privileged) break; // only allow in privileged code
1885 return _field_Stable;
1886 }
1887 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_TrustFinalFields_signature): {
1888 if (_location != _in_class) break; // only allow for classes
1889 if (!privileged) break; // only allow in privileged code
1890 return _jdk_internal_vm_annotation_TrustFinalFields;
1891 }
1892 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1893 if (_location != _in_field && _location != _in_class) {
1894 break; // only allow for fields and classes
1895 }
1896 if (!EnableContended || (RestrictContended && !privileged)) {
1897 break; // honor privileges
1898 }
1899 return _jdk_internal_vm_annotation_Contended;
1900 }
1901 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1902 if (_location != _in_method) break; // only allow for methods
1903 if (RestrictReservedStack && !privileged) break; // honor privileges
1904 return _jdk_internal_vm_annotation_ReservedStackAccess;
1905 }
1906 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1907 if (_location != _in_class) break; // only allow for classes
1908 if (!privileged) break; // only allow in privileged code
1909 return _jdk_internal_ValueBased;
1910 }
1911 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
1912 return _java_lang_Deprecated;
1913 }
1914 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): {
1915 if (_location != _in_class) break; // only allow for classes
1916 if (!privileged) break; // only allow in privileged code
1917 return _jdk_internal_vm_annotation_AOTSafeClassInitializer;
1918 }
1919 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): {
1920 if (_location != _in_method) break; // only allow for methods
1921 if (!privileged) break; // only allow in privileged code
1922 return _method_AOTRuntimeSetup;
1923 }
1924 default: {
1925 break;
1926 }
1927 }
1928 return AnnotationCollector::_unknown;
1929 }
1930
1931 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1932 if (is_contended())
1933 // Setting the contended group also sets the contended bit in field flags
1934 f->set_contended_group(contended_group());
1935 if (is_stable())
1936 (f->field_flags_addr())->update_stable(true);
1937 }
1938
1939 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1940 // If there's an error deallocate metadata for field annotations
1941 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1942 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1943 }
1944
1945 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
1946 if (has_annotation(_method_CallerSensitive))
1947 m->set_caller_sensitive();
1948 if (has_annotation(_method_ForceInline))
1949 m->set_force_inline();
1950 if (has_annotation(_method_DontInline))
1951 m->set_dont_inline();
1952 if (has_annotation(_method_ChangesCurrentThread))
1953 m->set_changes_current_thread();
1954 if (has_annotation(_method_JvmtiHideEvents))
1955 m->set_jvmti_hide_events();
1956 if (has_annotation(_method_JvmtiMountTransition))
1957 m->set_jvmti_mount_transition();
1958 if (has_annotation(_method_InjectedProfile))
1959 m->set_has_injected_profile();
1960 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1961 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1962 if (has_annotation(_method_Hidden))
1963 m->set_is_hidden();
1964 if (has_annotation(_method_Scoped))
1965 m->set_scoped();
1966 if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
1967 m->set_intrinsic_candidate();
1968 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
1969 m->set_has_reserved_stack_access();
1970 if (has_annotation(_java_lang_Deprecated))
1971 m->set_deprecated();
1972 if (has_annotation(_java_lang_Deprecated_for_removal))
1973 m->set_deprecated_for_removal();
1974 }
1975
1976 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
1977 assert(ik != nullptr, "invariant");
1978 if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
1979 ik->set_is_contended(is_contended());
1980 }
1981 if (has_annotation(_jdk_internal_ValueBased)) {
1982 ik->set_has_value_based_class_annotation();
1983 if (DiagnoseSyncOnValueBasedClasses) {
1984 ik->set_is_value_based();
1985 }
1986 }
1987 if (has_annotation(_java_lang_Deprecated)) {
1988 Array<Method*>* methods = ik->methods();
1989 int length = ik->methods()->length();
1990 for (int i = 0; i < length; i++) {
1991 Method* m = methods->at(i);
1992 m->set_deprecated();
1993 }
1994 }
1995 if (has_annotation(_java_lang_Deprecated_for_removal)) {
1996 Array<Method*>* methods = ik->methods();
1997 int length = ik->methods()->length();
1998 for (int i = 0; i < length; i++) {
1999 Method* m = methods->at(i);
2000 m->set_deprecated_for_removal();
2001 }
2002 }
2003 if (has_annotation(_jdk_internal_vm_annotation_AOTSafeClassInitializer)) {
2004 ik->set_has_aot_safe_initializer();
2005 }
2006 if (has_annotation(_jdk_internal_vm_annotation_TrustFinalFields)) {
2007 ik->set_trust_final_fields(true);
2008 }
2009 }
2010
2011 #define MAX_ARGS_SIZE 255
2012 #define MAX_CODE_SIZE 65535
2013 #define INITIAL_MAX_LVT_NUMBER 256
2014
2015 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2016 *
2017 * Rules for LVT's and LVTT's are:
2018 * - There can be any number of LVT's and LVTT's.
2019 * - If there are n LVT's, it is the same as if there was just
2020 * one LVT containing all the entries from the n LVT's.
2021 * - There may be no more than one LVT entry per local variable.
2022 * Two LVT entries are 'equal' if these fields are the same:
2023 * start_pc, length, name, slot
2024 * - There may be no more than one LVTT entry per each LVT entry.
2025 * Each LVTT entry has to match some LVT entry.
2026 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2027 */
2028 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2029 int lvt_cnt,
2030 u2* const localvariable_table_length,
2031 const unsafe_u2** const localvariable_table_start,
2032 int lvtt_cnt,
2033 u2* const localvariable_type_table_length,
2034 const unsafe_u2** const localvariable_type_table_start,
2035 TRAPS) {
2036
2037 ResourceMark rm(THREAD);
2038
2039 typedef HashTable<LocalVariableTableElement, LocalVariableTableElement*,
2040 256, AnyObj::RESOURCE_AREA, mtInternal,
2041 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2042
2043 LVT_HashTable* const table = new LVT_HashTable();
2044
2045 // To fill LocalVariableTable in
2046 const Classfile_LVT_Element* cf_lvt;
2047 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2048
2049 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2050 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2051 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2052 copy_lvt_element(&cf_lvt[idx], lvt);
2053 // If no duplicates, add LVT elem in hashtable.
2054 if (table->put(*lvt, lvt) == false
2055 && _need_verify
2056 && _major_version >= JAVA_1_5_VERSION) {
2057 classfile_parse_error("Duplicated LocalVariableTable attribute "
2058 "entry for '%s' in class file %s",
2059 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2060 THREAD);
2061 return;
2062 }
2063 }
2064 }
2065
2066 // To merge LocalVariableTable and LocalVariableTypeTable
2067 const Classfile_LVT_Element* cf_lvtt;
2068 LocalVariableTableElement lvtt_elem;
2069
2070 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2071 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2072 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2073 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2074 LocalVariableTableElement** entry = table->get(lvtt_elem);
2075 if (entry == nullptr) {
2076 if (_need_verify) {
2077 classfile_parse_error("LVTT entry for '%s' in class file %s "
2078 "does not match any LVT entry",
2079 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2080 THREAD);
2081 return;
2082 }
2083 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2084 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2085 "entry for '%s' in class file %s",
2086 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2087 THREAD);
2088 return;
2089 } else {
2090 // to add generic signatures into LocalVariableTable
2091 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2092 }
2093 }
2094 }
2095 }
2096
2097
2098 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2099 const u1* runtime_visible_annotations,
2100 int runtime_visible_annotations_length,
2101 const u1* runtime_visible_parameter_annotations,
2102 int runtime_visible_parameter_annotations_length,
2103 const u1* runtime_visible_type_annotations,
2104 int runtime_visible_type_annotations_length,
2105 const u1* annotation_default,
2106 int annotation_default_length,
2107 TRAPS) {
2108
2109 AnnotationArray* a;
2110
2111 if (runtime_visible_annotations_length > 0) {
2112 a = allocate_annotations(runtime_visible_annotations,
2113 runtime_visible_annotations_length,
2114 CHECK);
2115 cm->set_method_annotations(a);
2116 }
2117
2118 if (runtime_visible_parameter_annotations_length > 0) {
2119 a = allocate_annotations(runtime_visible_parameter_annotations,
2120 runtime_visible_parameter_annotations_length,
2121 CHECK);
2122 cm->set_parameter_annotations(a);
2123 }
2124
2125 if (annotation_default_length > 0) {
2126 a = allocate_annotations(annotation_default,
2127 annotation_default_length,
2128 CHECK);
2129 cm->set_default_annotations(a);
2130 }
2131
2132 if (runtime_visible_type_annotations_length > 0) {
2133 a = allocate_annotations(runtime_visible_type_annotations,
2134 runtime_visible_type_annotations_length,
2135 CHECK);
2136 cm->set_type_annotations(a);
2137 }
2138 }
2139
2140
2141 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2142 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2143 // Method* to save footprint, so we only know the size of the resulting Method* when the
2144 // entire method attribute is parsed.
2145 //
2146 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2147
2148 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2149 bool is_interface,
2150 const ConstantPool* cp,
2151 bool* const has_localvariable_table,
2152 TRAPS) {
2153 assert(cfs != nullptr, "invariant");
2154 assert(cp != nullptr, "invariant");
2155 assert(has_localvariable_table != nullptr, "invariant");
2156
2157 ResourceMark rm(THREAD);
2158 // Parse fixed parts:
2159 // access_flags, name_index, descriptor_index, attributes_count
2160 cfs->guarantee_more(8, CHECK_NULL);
2161
2162 u2 flags = cfs->get_u2_fast();
2163 const u2 name_index = cfs->get_u2_fast();
2164 const int cp_size = cp->length();
2165 guarantee_property(
2166 valid_symbol_at(name_index),
2167 "Illegal constant pool index %u for method name in class file %s",
2168 name_index, CHECK_NULL);
2169 const Symbol* const name = cp->symbol_at(name_index);
2170 verify_legal_method_name(name, CHECK_NULL);
2171
2172 const u2 signature_index = cfs->get_u2_fast();
2173 guarantee_property(
2174 valid_symbol_at(signature_index),
2175 "Illegal constant pool index %u for method signature in class file %s",
2176 signature_index, CHECK_NULL);
2177 const Symbol* const signature = cp->symbol_at(signature_index);
2178
2179 if (name == vmSymbols::class_initializer_name()) {
2180 // We ignore the other access flags for a valid class initializer.
2181 // (JVM Spec 2nd ed., chapter 4.6)
2182 if (_major_version < 51) { // backward compatibility
2183 flags = JVM_ACC_STATIC;
2184 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2185 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2186 } else {
2187 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2188 return nullptr;
2189 }
2190 } else {
2191 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2192 }
2193
2194 if (name == vmSymbols::object_initializer_name() && is_interface) {
2195 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2196 return nullptr;
2197 }
2198
2199 int args_size = -1; // only used when _need_verify is true
2200 if (_need_verify) {
2201 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2202 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2203 verify_legal_method_signature(name, signature, CHECK_NULL);
2204 if (args_size > MAX_ARGS_SIZE) {
2205 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2206 return nullptr;
2207 }
2208 }
2209
2210 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2211
2212 // Default values for code and exceptions attribute elements
2213 u2 max_stack = 0;
2214 u2 max_locals = 0;
2215 u4 code_length = 0;
2216 const u1* code_start = nullptr;
2217 u2 exception_table_length = 0;
2218 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2219 Array<int>* exception_handlers = Universe::the_empty_int_array();
2220 u2 checked_exceptions_length = 0;
2221 const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2222 CompressedLineNumberWriteStream* linenumber_table = nullptr;
2223 int linenumber_table_length = 0;
2224 int total_lvt_length = 0;
2225 u2 lvt_cnt = 0;
2226 u2 lvtt_cnt = 0;
2227 bool lvt_allocated = false;
2228 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2229 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2230 u2* localvariable_table_length = nullptr;
2231 const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes
2232 u2* localvariable_type_table_length = nullptr;
2233 const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes
2234 int method_parameters_length = -1;
2235 const u1* method_parameters_data = nullptr;
2236 bool method_parameters_seen = false;
2237 bool parsed_code_attribute = false;
2238 bool parsed_checked_exceptions_attribute = false;
2239 bool parsed_stackmap_attribute = false;
2240 // stackmap attribute - JDK1.5
2241 const u1* stackmap_data = nullptr;
2242 int stackmap_data_length = 0;
2243 u2 generic_signature_index = 0;
2244 MethodAnnotationCollector parsed_annotations;
2245 const u1* runtime_visible_annotations = nullptr;
2246 int runtime_visible_annotations_length = 0;
2247 const u1* runtime_visible_parameter_annotations = nullptr;
2248 int runtime_visible_parameter_annotations_length = 0;
2249 const u1* runtime_visible_type_annotations = nullptr;
2250 int runtime_visible_type_annotations_length = 0;
2251 bool runtime_invisible_annotations_exists = false;
2252 bool runtime_invisible_type_annotations_exists = false;
2253 bool runtime_invisible_parameter_annotations_exists = false;
2254 const u1* annotation_default = nullptr;
2255 int annotation_default_length = 0;
2256
2257 // Parse code and exceptions attribute
2258 u2 method_attributes_count = cfs->get_u2_fast();
2259 while (method_attributes_count--) {
2260 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2261 const u2 method_attribute_name_index = cfs->get_u2_fast();
2262 const u4 method_attribute_length = cfs->get_u4_fast();
2263 guarantee_property(
2264 valid_symbol_at(method_attribute_name_index),
2265 "Invalid method attribute name index %u in class file %s",
2266 method_attribute_name_index, CHECK_NULL);
2267
2268 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2269 if (method_attribute_name == vmSymbols::tag_code()) {
2270 // Parse Code attribute
2271 if (_need_verify) {
2272 guarantee_property(
2273 !access_flags.is_native() && !access_flags.is_abstract(),
2274 "Code attribute in native or abstract methods in class file %s",
2275 CHECK_NULL);
2276 }
2277 if (parsed_code_attribute) {
2278 classfile_parse_error("Multiple Code attributes in class file %s",
2279 THREAD);
2280 return nullptr;
2281 }
2282 parsed_code_attribute = true;
2283
2284 // Stack size, locals size, and code size
2285 cfs->guarantee_more(8, CHECK_NULL);
2286 max_stack = cfs->get_u2_fast();
2287 max_locals = cfs->get_u2_fast();
2288 code_length = cfs->get_u4_fast();
2289 if (_need_verify) {
2290 guarantee_property(args_size <= max_locals,
2291 "Arguments can't fit into locals in class file %s",
2292 CHECK_NULL);
2293 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2294 "Invalid method Code length %u in class file %s",
2295 code_length, CHECK_NULL);
2296 }
2297 // Code pointer
2298 code_start = cfs->current();
2299 assert(code_start != nullptr, "null code start");
2300 cfs->guarantee_more(code_length, CHECK_NULL);
2301 cfs->skip_u1_fast(code_length);
2302
2303 // Exception handler table
2304 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2305 exception_table_length = cfs->get_u2_fast();
2306 if (exception_table_length > 0) {
2307 exception_table_start = parse_exception_table(cfs,
2308 code_length,
2309 exception_table_length,
2310 CHECK_NULL);
2311 }
2312
2313 // Parse additional attributes in code attribute
2314 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2315 u2 code_attributes_count = cfs->get_u2_fast();
2316
2317 unsigned int calculated_attribute_length = 0;
2318
2319 calculated_attribute_length =
2320 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2321 calculated_attribute_length += checked_cast<unsigned int>(
2322 code_length +
2323 sizeof(exception_table_length) +
2324 sizeof(code_attributes_count) +
2325 exception_table_length *
2326 ( sizeof(u2) + // start_pc
2327 sizeof(u2) + // end_pc
2328 sizeof(u2) + // handler_pc
2329 sizeof(u2) )); // catch_type_index
2330
2331 while (code_attributes_count--) {
2332 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2333 const u2 code_attribute_name_index = cfs->get_u2_fast();
2334 const u4 code_attribute_length = cfs->get_u4_fast();
2335 calculated_attribute_length += code_attribute_length +
2336 (unsigned)sizeof(code_attribute_name_index) +
2337 (unsigned)sizeof(code_attribute_length);
2338 guarantee_property(valid_symbol_at(code_attribute_name_index),
2339 "Invalid code attribute name index %u in class file %s",
2340 code_attribute_name_index,
2341 CHECK_NULL);
2342 if (LoadLineNumberTables &&
2343 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2344 // Parse and compress line number table
2345 parse_linenumber_table(code_attribute_length,
2346 code_length,
2347 &linenumber_table,
2348 CHECK_NULL);
2349
2350 } else if (LoadLocalVariableTables &&
2351 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2352 // Parse local variable table
2353 if (!lvt_allocated) {
2354 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2355 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2356 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2357 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2358 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2359 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2360 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2361 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2362 lvt_allocated = true;
2363 }
2364 if (lvt_cnt == max_lvt_cnt) {
2365 max_lvt_cnt <<= 1;
2366 localvariable_table_length = REALLOC_RESOURCE_ARRAY(localvariable_table_length, lvt_cnt, max_lvt_cnt);
2367 localvariable_table_start = REALLOC_RESOURCE_ARRAY(localvariable_table_start, lvt_cnt, max_lvt_cnt);
2368 }
2369 localvariable_table_start[lvt_cnt] =
2370 parse_localvariable_table(cfs,
2371 code_length,
2372 max_locals,
2373 code_attribute_length,
2374 &localvariable_table_length[lvt_cnt],
2375 false, // is not LVTT
2376 CHECK_NULL);
2377 total_lvt_length += localvariable_table_length[lvt_cnt];
2378 lvt_cnt++;
2379 } else if (LoadLocalVariableTypeTables &&
2380 _major_version >= JAVA_1_5_VERSION &&
2381 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2382 if (!lvt_allocated) {
2383 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2384 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2385 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2386 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2387 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2388 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2389 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2390 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2391 lvt_allocated = true;
2392 }
2393 // Parse local variable type table
2394 if (lvtt_cnt == max_lvtt_cnt) {
2395 max_lvtt_cnt <<= 1;
2396 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2397 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2398 }
2399 localvariable_type_table_start[lvtt_cnt] =
2400 parse_localvariable_table(cfs,
2401 code_length,
2402 max_locals,
2403 code_attribute_length,
2404 &localvariable_type_table_length[lvtt_cnt],
2405 true, // is LVTT
2406 CHECK_NULL);
2407 lvtt_cnt++;
2408 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2409 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2410 // Stack map is only needed by the new verifier in JDK1.5.
2411 if (parsed_stackmap_attribute) {
2412 classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
2413 return nullptr;
2414 }
2415 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL);
2416 stackmap_data_length = code_attribute_length;
2417 parsed_stackmap_attribute = true;
2418 } else {
2419 // Skip unknown attributes
2420 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2421 }
2422 }
2423 // check method attribute length
2424 if (_need_verify) {
2425 guarantee_property(method_attribute_length == calculated_attribute_length,
2426 "Code segment has wrong length in class file %s",
2427 CHECK_NULL);
2428 }
2429 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2430 // Parse Exceptions attribute
2431 if (parsed_checked_exceptions_attribute) {
2432 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2433 THREAD);
2434 return nullptr;
2435 }
2436 parsed_checked_exceptions_attribute = true;
2437 checked_exceptions_start =
2438 parse_checked_exceptions(cfs,
2439 &checked_exceptions_length,
2440 method_attribute_length,
2441 CHECK_NULL);
2442 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2443 // reject multiple method parameters
2444 if (method_parameters_seen) {
2445 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2446 THREAD);
2447 return nullptr;
2448 }
2449 method_parameters_seen = true;
2450 method_parameters_length = cfs->get_u1_fast();
2451 const u4 real_length = (method_parameters_length * 4u) + 1u;
2452 if (method_attribute_length != real_length) {
2453 classfile_parse_error(
2454 "Invalid MethodParameters method attribute length %u in class file",
2455 method_attribute_length, THREAD);
2456 return nullptr;
2457 }
2458 method_parameters_data = cfs->current();
2459 cfs->skip_u2_fast(method_parameters_length);
2460 cfs->skip_u2_fast(method_parameters_length);
2461 // ignore this attribute if it cannot be reflected
2462 if (!vmClasses::reflect_Parameter_klass_is_loaded())
2463 method_parameters_length = -1;
2464 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2465 if (method_attribute_length != 0) {
2466 classfile_parse_error(
2467 "Invalid Synthetic method attribute length %u in class file %s",
2468 method_attribute_length, THREAD);
2469 return nullptr;
2470 }
2471 // Should we check that there hasn't already been a synthetic attribute?
2472 access_flags.set_is_synthetic();
2473 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2474 if (method_attribute_length != 0) {
2475 classfile_parse_error(
2476 "Invalid Deprecated method attribute length %u in class file %s",
2477 method_attribute_length, THREAD);
2478 return nullptr;
2479 }
2480 } else if (_major_version >= JAVA_1_5_VERSION) {
2481 if (method_attribute_name == vmSymbols::tag_signature()) {
2482 if (generic_signature_index != 0) {
2483 classfile_parse_error(
2484 "Multiple Signature attributes for method in class file %s",
2485 THREAD);
2486 return nullptr;
2487 }
2488 if (method_attribute_length != 2) {
2489 classfile_parse_error(
2490 "Invalid Signature attribute length %u in class file %s",
2491 method_attribute_length, THREAD);
2492 return nullptr;
2493 }
2494 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2495 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2496 if (runtime_visible_annotations != nullptr) {
2497 classfile_parse_error(
2498 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2499 THREAD);
2500 return nullptr;
2501 }
2502 runtime_visible_annotations_length = method_attribute_length;
2503 runtime_visible_annotations = cfs->current();
2504 assert(runtime_visible_annotations != nullptr, "null visible annotations");
2505 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2506 parse_annotations(cp,
2507 runtime_visible_annotations,
2508 runtime_visible_annotations_length,
2509 &parsed_annotations,
2510 _loader_data,
2511 _can_access_vm_annotations);
2512 cfs->skip_u1_fast(runtime_visible_annotations_length);
2513 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2514 if (runtime_invisible_annotations_exists) {
2515 classfile_parse_error(
2516 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2517 THREAD);
2518 return nullptr;
2519 }
2520 runtime_invisible_annotations_exists = true;
2521 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2522 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2523 if (runtime_visible_parameter_annotations != nullptr) {
2524 classfile_parse_error(
2525 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2526 THREAD);
2527 return nullptr;
2528 }
2529 runtime_visible_parameter_annotations_length = method_attribute_length;
2530 runtime_visible_parameter_annotations = cfs->current();
2531 assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations");
2532 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2533 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2534 if (runtime_invisible_parameter_annotations_exists) {
2535 classfile_parse_error(
2536 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2537 THREAD);
2538 return nullptr;
2539 }
2540 runtime_invisible_parameter_annotations_exists = true;
2541 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2542 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2543 if (annotation_default != nullptr) {
2544 classfile_parse_error(
2545 "Multiple AnnotationDefault attributes for method in class file %s",
2546 THREAD);
2547 return nullptr;
2548 }
2549 annotation_default_length = method_attribute_length;
2550 annotation_default = cfs->current();
2551 assert(annotation_default != nullptr, "null annotation default");
2552 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2553 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2554 if (runtime_visible_type_annotations != nullptr) {
2555 classfile_parse_error(
2556 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2557 THREAD);
2558 return nullptr;
2559 }
2560 runtime_visible_type_annotations_length = method_attribute_length;
2561 runtime_visible_type_annotations = cfs->current();
2562 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
2563 // No need for the VM to parse Type annotations
2564 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2565 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2566 if (runtime_invisible_type_annotations_exists) {
2567 classfile_parse_error(
2568 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2569 THREAD);
2570 return nullptr;
2571 }
2572 runtime_invisible_type_annotations_exists = true;
2573 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2574 } else {
2575 // Skip unknown attributes
2576 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2577 }
2578 } else {
2579 // Skip unknown attributes
2580 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2581 }
2582 }
2583
2584 if (linenumber_table != nullptr) {
2585 linenumber_table->write_terminator();
2586 linenumber_table_length = linenumber_table->position();
2587 }
2588
2589 // Make sure there's at least one Code attribute in non-native/non-abstract method
2590 if (_need_verify) {
2591 guarantee_property(access_flags.is_native() ||
2592 access_flags.is_abstract() ||
2593 parsed_code_attribute,
2594 "Absent Code attribute in method that is not native or abstract in class file %s",
2595 CHECK_NULL);
2596 }
2597
2598 // All sizing information for a Method* is finally available, now create it
2599 InlineTableSizes sizes(
2600 total_lvt_length,
2601 linenumber_table_length,
2602 exception_table_length,
2603 checked_exceptions_length,
2604 method_parameters_length,
2605 generic_signature_index,
2606 runtime_visible_annotations_length,
2607 runtime_visible_parameter_annotations_length,
2608 runtime_visible_type_annotations_length,
2609 annotation_default_length,
2610 0);
2611
2612 Method* const m = Method::allocate(_loader_data,
2613 code_length,
2614 access_flags,
2615 &sizes,
2616 ConstMethod::NORMAL,
2617 _cp->symbol_at(name_index),
2618 CHECK_NULL);
2619
2620 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2621
2622 // Fill in information from fixed part (access_flags already set)
2623 m->set_constants(_cp);
2624 m->set_name_index(name_index);
2625 m->set_signature_index(signature_index);
2626 m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static());
2627 assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2628
2629 // Fill in code attribute information
2630 m->set_max_stack(max_stack);
2631 m->set_max_locals(max_locals);
2632 if (stackmap_data != nullptr) {
2633 m->constMethod()->copy_stackmap_data(_loader_data,
2634 (u1*)stackmap_data,
2635 stackmap_data_length,
2636 CHECK_NULL);
2637 }
2638
2639 // Copy byte codes
2640 m->set_code((u1*)code_start);
2641
2642 // Copy line number table
2643 if (linenumber_table != nullptr) {
2644 memcpy(m->compressed_linenumber_table(),
2645 linenumber_table->buffer(),
2646 linenumber_table_length);
2647 }
2648
2649 // Copy exception table
2650 if (exception_table_length > 0) {
2651 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2652 m->exception_table_start(),
2653 exception_table_length * sizeof(ExceptionTableElement),
2654 sizeof(u2));
2655 }
2656
2657 // Copy method parameters
2658 if (method_parameters_length > 0) {
2659 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2660 for (int i = 0; i < method_parameters_length; i++) {
2661 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2662 method_parameters_data += 2;
2663 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2664 method_parameters_data += 2;
2665 }
2666 }
2667
2668 // Copy checked exceptions
2669 if (checked_exceptions_length > 0) {
2670 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2671 m->checked_exceptions_start(),
2672 checked_exceptions_length * sizeof(CheckedExceptionElement),
2673 sizeof(u2));
2674 }
2675
2676 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2677 if (total_lvt_length > 0) {
2678 *has_localvariable_table = true;
2679 copy_localvariable_table(m->constMethod(),
2680 lvt_cnt,
2681 localvariable_table_length,
2682 localvariable_table_start,
2683 lvtt_cnt,
2684 localvariable_type_table_length,
2685 localvariable_type_table_start,
2686 CHECK_NULL);
2687 }
2688
2689 if (parsed_annotations.has_any_annotations())
2690 parsed_annotations.apply_to(methodHandle(THREAD, m));
2691
2692 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2693 m->set_is_hidden();
2694 }
2695 if (parsed_annotations.has_aot_runtime_setup()) {
2696 if (name != vmSymbols::runtimeSetup() || signature != vmSymbols::void_method_signature() ||
2697 !access_flags.is_private() || !access_flags.is_static()) {
2698 classfile_parse_error("@AOTRuntimeSetup method must be declared private static void runtimeSetup() for class %s", CHECK_NULL);
2699 }
2700 _has_aot_runtime_setup_method = true;
2701 }
2702
2703 // Copy annotations
2704 copy_method_annotations(m->constMethod(),
2705 runtime_visible_annotations,
2706 runtime_visible_annotations_length,
2707 runtime_visible_parameter_annotations,
2708 runtime_visible_parameter_annotations_length,
2709 runtime_visible_type_annotations,
2710 runtime_visible_type_annotations_length,
2711 annotation_default,
2712 annotation_default_length,
2713 CHECK_NULL);
2714
2715 if (InstanceKlass::is_finalization_enabled() &&
2716 name == vmSymbols::finalize_method_name() &&
2717 signature == vmSymbols::void_method_signature()) {
2718 if (m->is_empty_method()) {
2719 _has_empty_finalizer = true;
2720 } else {
2721 _has_finalizer = true;
2722 }
2723 }
2724
2725 NOT_PRODUCT(m->verify());
2726 return m;
2727 }
2728
2729
2730 // Side-effects: populates the _methods field in the parser
2731 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2732 bool is_interface,
2733 bool* const has_localvariable_table,
2734 bool* has_final_method,
2735 bool* declares_nonstatic_concrete_methods,
2736 TRAPS) {
2737 assert(cfs != nullptr, "invariant");
2738 assert(has_localvariable_table != nullptr, "invariant");
2739 assert(has_final_method != nullptr, "invariant");
2740 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2741
2742 assert(nullptr == _methods, "invariant");
2743
2744 cfs->guarantee_more(2, CHECK); // length
2745 const u2 length = cfs->get_u2_fast();
2746 if (length == 0) {
2747 _methods = Universe::the_empty_method_array();
2748 } else {
2749 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2750 length,
2751 nullptr,
2752 CHECK);
2753
2754 for (int index = 0; index < length; index++) {
2755 Method* method = parse_method(cfs,
2756 is_interface,
2757 _cp,
2758 has_localvariable_table,
2759 CHECK);
2760
2761 if (method->is_final()) {
2762 *has_final_method = true;
2763 }
2764 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2765 // used for interface initialization, and default method inheritance analysis
2766 if (is_interface && !(*declares_nonstatic_concrete_methods)
2767 && !method->is_abstract() && !method->is_static()) {
2768 *declares_nonstatic_concrete_methods = true;
2769 }
2770 _methods->at_put(index, method);
2771 }
2772
2773 if (_need_verify && length > 1) {
2774 // Check duplicated methods
2775 ResourceMark rm(THREAD);
2776 // Set containing name-signature pairs
2777 NameSigHashtable* names_and_sigs = new NameSigHashtable();
2778 for (int i = 0; i < length; i++) {
2779 const Method* const m = _methods->at(i);
2780 NameSigHash name_and_sig(m->name(), m->signature());
2781 // If no duplicates, add name/signature in hashtable names_and_sigs.
2782 if(!names_and_sigs->put(name_and_sig, 0)) {
2783 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2784 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
2785 return;
2786 }
2787 }
2788 }
2789 }
2790 }
2791
2792 static const intArray* sort_methods(Array<Method*>* methods) {
2793 const int length = methods->length();
2794 // If JVMTI original method ordering or sharing is enabled we have to
2795 // remember the original class file ordering.
2796 // We temporarily use the vtable_index field in the Method* to store the
2797 // class file index, so we can read in after calling qsort.
2798 // Put the method ordering in the shared archive.
2799 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2800 for (int index = 0; index < length; index++) {
2801 Method* const m = methods->at(index);
2802 assert(!m->valid_vtable_index(), "vtable index should not be set");
2803 m->set_vtable_index(index);
2804 }
2805 }
2806 // Sort method array by ascending method name (for faster lookups & vtable construction)
2807 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2808 Method::sort_methods(methods);
2809
2810 intArray* method_ordering = nullptr;
2811 // If JVMTI original method ordering or sharing is enabled construct int
2812 // array remembering the original ordering
2813 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2814 method_ordering = new intArray(length, length, -1);
2815 for (int index = 0; index < length; index++) {
2816 Method* const m = methods->at(index);
2817 const int old_index = m->vtable_index();
2818 assert(old_index >= 0 && old_index < length, "invalid method index");
2819 method_ordering->at_put(index, old_index);
2820 m->set_vtable_index(Method::invalid_vtable_index);
2821 }
2822 }
2823 return method_ordering;
2824 }
2825
2826 // Parse generic_signature attribute for methods and fields
2827 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
2828 TRAPS) {
2829 assert(cfs != nullptr, "invariant");
2830
2831 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2832 const u2 generic_signature_index = cfs->get_u2_fast();
2833 guarantee_property(
2834 valid_symbol_at(generic_signature_index),
2835 "Invalid Signature attribute at constant pool index %u in class file %s",
2836 generic_signature_index, CHECK_0);
2837 return generic_signature_index;
2838 }
2839
2840 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
2841 TRAPS) {
2842
2843 assert(cfs != nullptr, "invariant");
2844
2845 cfs->guarantee_more(2, CHECK); // sourcefile_index
2846 const u2 sourcefile_index = cfs->get_u2_fast();
2847 guarantee_property(
2848 valid_symbol_at(sourcefile_index),
2849 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2850 sourcefile_index, CHECK);
2851 set_class_sourcefile_index(sourcefile_index);
2852 }
2853
2854 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
2855 int length,
2856 TRAPS) {
2857 assert(cfs != nullptr, "invariant");
2858
2859 const u1* const sde_buffer = cfs->current();
2860 assert(sde_buffer != nullptr, "null sde buffer");
2861
2862 // Don't bother storing it if there is no way to retrieve it
2863 if (JvmtiExport::can_get_source_debug_extension()) {
2864 assert((length+1) > length, "Overflow checking");
2865 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2866 for (int i = 0; i < length; i++) {
2867 sde[i] = sde_buffer[i];
2868 }
2869 sde[length] = '\0';
2870 set_class_sde_buffer((const char*)sde, length);
2871 }
2872 // Got utf8 string, set stream position forward
2873 cfs->skip_u1(length, CHECK);
2874 }
2875
2876
2877 // Inner classes can be static, private or protected (classic VM does this)
2878 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
2879 JVM_ACC_PRIVATE | \
2880 JVM_ACC_PROTECTED | \
2881 JVM_ACC_STATIC \
2882 )
2883
2884 // Find index of the InnerClasses entry for the specified inner_class_info_index.
2885 // Return -1 if none is found.
2886 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2887 Symbol* cp_klass_name = cp->klass_name_at(inner);
2888 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2889 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2890 if (cp->klass_name_at(idx_inner) == cp_klass_name) {
2891 return idx;
2892 }
2893 }
2894 return -1;
2895 }
2896
2897 // Return the outer_class_info_index for the InnerClasses entry containing the
2898 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found.
2899 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2900 if (inner == 0) return -1;
2901 int idx = inner_classes_find_index(inner_classes, inner, cp, length);
2902 if (idx == -1) return -1;
2903 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2904 return result;
2905 }
2906
2907 // Return true if circularity is found, false if no circularity is found.
2908 // Use Floyd's cycle finding algorithm.
2909 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
2910 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2911 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2912
2913 while (fast != -1 && fast != 0) {
2914 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
2915 return true; // found a circularity
2916 }
2917 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
2918 if (fast == -1) return false;
2919 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
2920 if (fast == -1) return false;
2921 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
2922 assert(slow != -1, "sanity check");
2923 }
2924 return false;
2925 }
2926
2927 // Loop through each InnerClasses entry checking for circularities and duplications
2928 // with other entries. If duplicate entries are found then throw CFE. Otherwise,
2929 // return true if a circularity or entries with duplicate inner_class_info_indexes
2930 // are found.
2931 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
2932 // Loop through each InnerClasses entry.
2933 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2934 // Return true if there are circular entries.
2935 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
2936 return true;
2937 }
2938 // Check if there are duplicate entries or entries with the same inner_class_info_index.
2939 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
2940 y += InstanceKlass::inner_class_next_offset) {
2941
2942 // 4347400: make sure there's no duplicate entry in the classes array
2943 if (_major_version >= JAVA_1_5_VERSION) {
2944 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
2945 _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
2946 _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
2947 _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
2948 "Duplicate entry in InnerClasses attribute in class file %s",
2949 CHECK_(true));
2950 }
2951 // Return true if there are two entries with the same inner_class_info_index.
2952 if (_inner_classes->at(y) == _inner_classes->at(idx)) {
2953 return true;
2954 }
2955 }
2956 }
2957 return false;
2958 }
2959
2960 // Return number of classes in the inner classes attribute table
2961 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
2962 const ConstantPool* cp,
2963 const u1* const inner_classes_attribute_start,
2964 bool parsed_enclosingmethod_attribute,
2965 u2 enclosing_method_class_index,
2966 u2 enclosing_method_method_index,
2967 TRAPS) {
2968 const u1* const current_mark = cfs->current();
2969 u2 length = 0;
2970 if (inner_classes_attribute_start != nullptr) {
2971 cfs->set_current(inner_classes_attribute_start);
2972 cfs->guarantee_more(2, CHECK_0); // length
2973 length = cfs->get_u2_fast();
2974 }
2975
2976 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2977 // method data:
2978 // [inner_class_info_index,
2979 // outer_class_info_index,
2980 // inner_name_index,
2981 // inner_class_access_flags,
2982 // ...
2983 // enclosing_method_class_index,
2984 // enclosing_method_method_index]
2985 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2986 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2987 _inner_classes = inner_classes;
2988
2989 int index = 0;
2990 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2991 for (int n = 0; n < length; n++) {
2992 // Inner class index
2993 const u2 inner_class_info_index = cfs->get_u2_fast();
2994 guarantee_property(
2995 valid_klass_reference_at(inner_class_info_index),
2996 "inner_class_info_index %u has bad constant type in class file %s",
2997 inner_class_info_index, CHECK_0);
2998 // Outer class index
2999 const u2 outer_class_info_index = cfs->get_u2_fast();
3000 guarantee_property(
3001 outer_class_info_index == 0 ||
3002 valid_klass_reference_at(outer_class_info_index),
3003 "outer_class_info_index %u has bad constant type in class file %s",
3004 outer_class_info_index, CHECK_0);
3005
3006 if (outer_class_info_index != 0) {
3007 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3008 char* bytes = (char*)outer_class_name->bytes();
3009 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3010 "Outer class is an array class in class file %s", CHECK_0);
3011 }
3012 // Inner class name
3013 const u2 inner_name_index = cfs->get_u2_fast();
3014 guarantee_property(
3015 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3016 "inner_name_index %u has bad constant type in class file %s",
3017 inner_name_index, CHECK_0);
3018 if (_need_verify) {
3019 guarantee_property(inner_class_info_index != outer_class_info_index,
3020 "Class is both outer and inner class in class file %s", CHECK_0);
3021 }
3022 // Access flags
3023 u2 flags;
3024 // JVM_ACC_MODULE is defined in JDK-9 and later.
3025 if (_major_version >= JAVA_9_VERSION) {
3026 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3027 } else {
3028 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3029 }
3030 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3031 // Set abstract bit for old class files for backward compatibility
3032 flags |= JVM_ACC_ABSTRACT;
3033 }
3034
3035 Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index);
3036 verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0);
3037 AccessFlags inner_access_flags(flags);
3038
3039 inner_classes->at_put(index++, inner_class_info_index);
3040 inner_classes->at_put(index++, outer_class_info_index);
3041 inner_classes->at_put(index++, inner_name_index);
3042 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3043 }
3044
3045 // Check for circular and duplicate entries.
3046 bool has_circularity = false;
3047 if (_need_verify) {
3048 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3049 if (has_circularity) {
3050 // If circularity check failed then ignore InnerClasses attribute.
3051 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3052 index = 0;
3053 if (parsed_enclosingmethod_attribute) {
3054 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3055 _inner_classes = inner_classes;
3056 } else {
3057 _inner_classes = Universe::the_empty_short_array();
3058 }
3059 }
3060 }
3061 // Set EnclosingMethod class and method indexes.
3062 if (parsed_enclosingmethod_attribute) {
3063 inner_classes->at_put(index++, enclosing_method_class_index);
3064 inner_classes->at_put(index++, enclosing_method_method_index);
3065 }
3066 assert(index == size || has_circularity, "wrong size");
3067
3068 // Restore buffer's current position.
3069 cfs->set_current(current_mark);
3070
3071 return length;
3072 }
3073
3074 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3075 const u1* const nest_members_attribute_start,
3076 TRAPS) {
3077 const u1* const current_mark = cfs->current();
3078 u2 length = 0;
3079 if (nest_members_attribute_start != nullptr) {
3080 cfs->set_current(nest_members_attribute_start);
3081 cfs->guarantee_more(2, CHECK_0); // length
3082 length = cfs->get_u2_fast();
3083 }
3084 const int size = length;
3085 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3086 _nest_members = nest_members;
3087
3088 int index = 0;
3089 cfs->guarantee_more(2 * length, CHECK_0);
3090 for (int n = 0; n < length; n++) {
3091 const u2 class_info_index = cfs->get_u2_fast();
3092 guarantee_property(
3093 valid_klass_reference_at(class_info_index),
3094 "Nest member class_info_index %u has bad constant type in class file %s",
3095 class_info_index, CHECK_0);
3096 nest_members->at_put(index++, class_info_index);
3097 }
3098 assert(index == size, "wrong size");
3099
3100 // Restore buffer's current position.
3101 cfs->set_current(current_mark);
3102
3103 return length;
3104 }
3105
3106 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3107 const u1* const permitted_subclasses_attribute_start,
3108 TRAPS) {
3109 const u1* const current_mark = cfs->current();
3110 u2 length = 0;
3111 if (permitted_subclasses_attribute_start != nullptr) {
3112 cfs->set_current(permitted_subclasses_attribute_start);
3113 cfs->guarantee_more(2, CHECK_0); // length
3114 length = cfs->get_u2_fast();
3115 }
3116 const int size = length;
3117 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3118 _permitted_subclasses = permitted_subclasses;
3119
3120 if (length > 0) {
3121 int index = 0;
3122 cfs->guarantee_more(2 * length, CHECK_0);
3123 for (int n = 0; n < length; n++) {
3124 const u2 class_info_index = cfs->get_u2_fast();
3125 guarantee_property(
3126 valid_klass_reference_at(class_info_index),
3127 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3128 class_info_index, CHECK_0);
3129 permitted_subclasses->at_put(index++, class_info_index);
3130 }
3131 assert(index == size, "wrong size");
3132 }
3133
3134 // Restore buffer's current position.
3135 cfs->set_current(current_mark);
3136
3137 return length;
3138 }
3139
3140 // Record {
3141 // u2 attribute_name_index;
3142 // u4 attribute_length;
3143 // u2 components_count;
3144 // component_info components[components_count];
3145 // }
3146 // component_info {
3147 // u2 name_index;
3148 // u2 descriptor_index
3149 // u2 attributes_count;
3150 // attribute_info_attributes[attributes_count];
3151 // }
3152 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3153 const ConstantPool* cp,
3154 const u1* const record_attribute_start,
3155 TRAPS) {
3156 const u1* const current_mark = cfs->current();
3157 int components_count = 0;
3158 unsigned int calculate_attr_size = 0;
3159 if (record_attribute_start != nullptr) {
3160 cfs->set_current(record_attribute_start);
3161 cfs->guarantee_more(2, CHECK_0); // num of components
3162 components_count = (int)cfs->get_u2_fast();
3163 calculate_attr_size = 2;
3164 }
3165
3166 Array<RecordComponent*>* const record_components =
3167 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0);
3168 _record_components = record_components;
3169
3170 for (int x = 0; x < components_count; x++) {
3171 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3172
3173 const u2 name_index = cfs->get_u2_fast();
3174 guarantee_property(valid_symbol_at(name_index),
3175 "Invalid constant pool index %u for name in Record attribute in class file %s",
3176 name_index, CHECK_0);
3177 const Symbol* const name = cp->symbol_at(name_index);
3178 verify_legal_field_name(name, CHECK_0);
3179
3180 const u2 descriptor_index = cfs->get_u2_fast();
3181 guarantee_property(valid_symbol_at(descriptor_index),
3182 "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3183 descriptor_index, CHECK_0);
3184 const Symbol* const descr = cp->symbol_at(descriptor_index);
3185 verify_legal_field_signature(name, descr, CHECK_0);
3186
3187 const u2 attributes_count = cfs->get_u2_fast();
3188 calculate_attr_size += 6;
3189 u2 generic_sig_index = 0;
3190 const u1* runtime_visible_annotations = nullptr;
3191 int runtime_visible_annotations_length = 0;
3192 bool runtime_invisible_annotations_exists = false;
3193 const u1* runtime_visible_type_annotations = nullptr;
3194 int runtime_visible_type_annotations_length = 0;
3195 bool runtime_invisible_type_annotations_exists = false;
3196
3197 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3198 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
3199 for (int y = 0; y < attributes_count; y++) {
3200 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
3201 const u2 attribute_name_index = cfs->get_u2_fast();
3202 const u4 attribute_length = cfs->get_u4_fast();
3203 calculate_attr_size += 6;
3204 guarantee_property(
3205 valid_symbol_at(attribute_name_index),
3206 "Invalid Record attribute name index %u in class file %s",
3207 attribute_name_index, CHECK_0);
3208
3209 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3210 if (attribute_name == vmSymbols::tag_signature()) {
3211 if (generic_sig_index != 0) {
3212 classfile_parse_error(
3213 "Multiple Signature attributes for Record component in class file %s",
3214 THREAD);
3215 return 0;
3216 }
3217 if (attribute_length != 2) {
3218 classfile_parse_error(
3219 "Invalid Signature attribute length %u in Record component in class file %s",
3220 attribute_length, THREAD);
3221 return 0;
3222 }
3223 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3224
3225 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3226 if (runtime_visible_annotations != nullptr) {
3227 classfile_parse_error(
3228 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
3229 return 0;
3230 }
3231 runtime_visible_annotations_length = attribute_length;
3232 runtime_visible_annotations = cfs->current();
3233
3234 assert(runtime_visible_annotations != nullptr, "null record component visible annotation");
3235 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3236 cfs->skip_u1_fast(runtime_visible_annotations_length);
3237
3238 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3239 if (runtime_invisible_annotations_exists) {
3240 classfile_parse_error(
3241 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
3242 return 0;
3243 }
3244 runtime_invisible_annotations_exists = true;
3245 cfs->skip_u1(attribute_length, CHECK_0);
3246
3247 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3248 if (runtime_visible_type_annotations != nullptr) {
3249 classfile_parse_error(
3250 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3251 return 0;
3252 }
3253 runtime_visible_type_annotations_length = attribute_length;
3254 runtime_visible_type_annotations = cfs->current();
3255
3256 assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation");
3257 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3258 cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3259
3260 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3261 if (runtime_invisible_type_annotations_exists) {
3262 classfile_parse_error(
3263 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3264 return 0;
3265 }
3266 runtime_invisible_type_annotations_exists = true;
3267 cfs->skip_u1(attribute_length, CHECK_0);
3268
3269 } else {
3270 // Skip unknown attributes
3271 cfs->skip_u1(attribute_length, CHECK_0);
3272 }
3273 calculate_attr_size += attribute_length;
3274 } // End of attributes For loop
3275
3276 AnnotationArray* annotations = allocate_annotations(runtime_visible_annotations,
3277 runtime_visible_annotations_length,
3278 CHECK_0);
3279 AnnotationArray* type_annotations = allocate_annotations(runtime_visible_type_annotations,
3280 runtime_visible_type_annotations_length,
3281 CHECK_0);
3282
3283 RecordComponent* record_component =
3284 RecordComponent::allocate(_loader_data, name_index, descriptor_index, generic_sig_index,
3285 annotations, type_annotations, CHECK_0);
3286 record_components->at_put(x, record_component);
3287 } // End of component processing loop
3288
3289 // Restore buffer's current position.
3290 cfs->set_current(current_mark);
3291 return calculate_attr_size;
3292 }
3293
3294 void ClassFileParser::parse_classfile_synthetic_attribute() {
3295 set_class_synthetic_flag(true);
3296 }
3297
3298 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3299 assert(cfs != nullptr, "invariant");
3300
3301 const u2 signature_index = cfs->get_u2(CHECK);
3302 guarantee_property(
3303 valid_symbol_at(signature_index),
3304 "Invalid constant pool index %u in Signature attribute in class file %s",
3305 signature_index, CHECK);
3306 set_class_generic_signature_index(signature_index);
3307 }
3308
3309 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3310 ConstantPool* cp,
3311 u4 attribute_byte_length,
3312 TRAPS) {
3313 assert(cfs != nullptr, "invariant");
3314 assert(cp != nullptr, "invariant");
3315 const int cp_size = cp->length();
3316
3317 const u1* const current_before_parsing = cfs->current();
3318
3319 guarantee_property(attribute_byte_length >= sizeof(u2),
3320 "Invalid BootstrapMethods attribute length %u in class file %s",
3321 attribute_byte_length,
3322 CHECK);
3323
3324 cfs->guarantee_more(attribute_byte_length, CHECK);
3325
3326 const int num_bootstrap_methods = cfs->get_u2_fast();
3327
3328 guarantee_property(_max_bootstrap_specifier_index < num_bootstrap_methods,
3329 "Short length on BootstrapMethods in class file %s",
3330 CHECK);
3331
3332 const u4 bootstrap_methods_u2_len = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3333
3334 // Eagerly assign the arrays so that they will be deallocated with the constant
3335 // pool if there is an error.
3336 BSMAttributeEntries::InsertionIterator iter =
3337 cp->bsm_entries().start_extension(num_bootstrap_methods,
3338 bootstrap_methods_u2_len,
3339 _loader_data,
3340 CHECK);
3341
3342 for (int i = 0; i < num_bootstrap_methods; i++) {
3343 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3344 u2 bootstrap_method_ref = cfs->get_u2_fast();
3345 u2 num_bootstrap_arguments = cfs->get_u2_fast();
3346 guarantee_property(
3347 valid_cp_range(bootstrap_method_ref, cp_size) &&
3348 cp->tag_at(bootstrap_method_ref).is_method_handle(),
3349 "bootstrap_method_index %u has bad constant type in class file %s",
3350 bootstrap_method_ref,
3351 CHECK);
3352 cfs->guarantee_more(sizeof(u2) * num_bootstrap_arguments, CHECK); // argv[argc]
3353
3354 BSMAttributeEntry* entry = iter.reserve_new_entry(bootstrap_method_ref, num_bootstrap_arguments);
3355 guarantee_property(entry != nullptr,
3356 "Invalid BootstrapMethods num_bootstrap_methods."
3357 " The total amount of space reserved for the BootstrapMethod attribute was not sufficient", CHECK);
3358
3359 for (int argi = 0; argi < num_bootstrap_arguments; argi++) {
3360 const u2 argument_index = cfs->get_u2_fast();
3361 guarantee_property(
3362 valid_cp_range(argument_index, cp_size) &&
3363 cp->tag_at(argument_index).is_loadable_constant(),
3364 "argument_index %u has bad constant type in class file %s",
3365 argument_index,
3366 CHECK);
3367 entry->set_argument(argi, argument_index);
3368 }
3369 }
3370 cp->bsm_entries().end_extension(iter, _loader_data, CHECK);
3371 guarantee_property(current_before_parsing + attribute_byte_length == cfs->current(),
3372 "Bad length on BootstrapMethods in class file %s",
3373 CHECK);
3374 }
3375
3376 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3377 ConstantPool* cp,
3378 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3379 TRAPS) {
3380 assert(cfs != nullptr, "invariant");
3381 assert(cp != nullptr, "invariant");
3382 assert(parsed_annotations != nullptr, "invariant");
3383
3384 // Set inner classes attribute to default sentinel
3385 _inner_classes = Universe::the_empty_short_array();
3386 // Set nest members attribute to default sentinel
3387 _nest_members = Universe::the_empty_short_array();
3388 // Set _permitted_subclasses attribute to default sentinel
3389 _permitted_subclasses = Universe::the_empty_short_array();
3390 cfs->guarantee_more(2, CHECK); // attributes_count
3391 u2 attributes_count = cfs->get_u2_fast();
3392 bool parsed_sourcefile_attribute = false;
3393 bool parsed_innerclasses_attribute = false;
3394 bool parsed_nest_members_attribute = false;
3395 bool parsed_permitted_subclasses_attribute = false;
3396 bool parsed_nest_host_attribute = false;
3397 bool parsed_record_attribute = false;
3398 bool parsed_enclosingmethod_attribute = false;
3399 bool parsed_bootstrap_methods_attribute = false;
3400 const u1* runtime_visible_annotations = nullptr;
3401 int runtime_visible_annotations_length = 0;
3402 const u1* runtime_visible_type_annotations = nullptr;
3403 int runtime_visible_type_annotations_length = 0;
3404 bool runtime_invisible_type_annotations_exists = false;
3405 bool runtime_invisible_annotations_exists = false;
3406 bool parsed_source_debug_ext_annotations_exist = false;
3407 const u1* inner_classes_attribute_start = nullptr;
3408 u4 inner_classes_attribute_length = 0;
3409 u2 enclosing_method_class_index = 0;
3410 u2 enclosing_method_method_index = 0;
3411 const u1* nest_members_attribute_start = nullptr;
3412 u4 nest_members_attribute_length = 0;
3413 const u1* record_attribute_start = nullptr;
3414 u4 record_attribute_length = 0;
3415 const u1* permitted_subclasses_attribute_start = nullptr;
3416 u4 permitted_subclasses_attribute_length = 0;
3417
3418 // Iterate over attributes
3419 while (attributes_count--) {
3420 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3421 const u2 attribute_name_index = cfs->get_u2_fast();
3422 const u4 attribute_length = cfs->get_u4_fast();
3423 guarantee_property(
3424 valid_symbol_at(attribute_name_index),
3425 "Attribute name has bad constant pool index %u in class file %s",
3426 attribute_name_index, CHECK);
3427 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3428 if (tag == vmSymbols::tag_source_file()) {
3429 // Check for SourceFile tag
3430 if (_need_verify) {
3431 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3432 }
3433 if (parsed_sourcefile_attribute) {
3434 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3435 return;
3436 } else {
3437 parsed_sourcefile_attribute = true;
3438 }
3439 parse_classfile_sourcefile_attribute(cfs, CHECK);
3440 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3441 // Check for SourceDebugExtension tag
3442 if (parsed_source_debug_ext_annotations_exist) {
3443 classfile_parse_error(
3444 "Multiple SourceDebugExtension attributes in class file %s", THREAD);
3445 return;
3446 }
3447 parsed_source_debug_ext_annotations_exist = true;
3448 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3449 } else if (tag == vmSymbols::tag_inner_classes()) {
3450 // Check for InnerClasses tag
3451 if (parsed_innerclasses_attribute) {
3452 classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
3453 return;
3454 } else {
3455 parsed_innerclasses_attribute = true;
3456 }
3457 inner_classes_attribute_start = cfs->current();
3458 inner_classes_attribute_length = attribute_length;
3459 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3460 } else if (tag == vmSymbols::tag_synthetic()) {
3461 // Check for Synthetic tag
3462 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3463 if (attribute_length != 0) {
3464 classfile_parse_error(
3465 "Invalid Synthetic classfile attribute length %u in class file %s",
3466 attribute_length, THREAD);
3467 return;
3468 }
3469 parse_classfile_synthetic_attribute();
3470 } else if (tag == vmSymbols::tag_deprecated()) {
3471 // Check for Deprecated tag - 4276120
3472 if (attribute_length != 0) {
3473 classfile_parse_error(
3474 "Invalid Deprecated classfile attribute length %u in class file %s",
3475 attribute_length, THREAD);
3476 return;
3477 }
3478 } else if (_major_version >= JAVA_1_5_VERSION) {
3479 if (tag == vmSymbols::tag_signature()) {
3480 if (_generic_signature_index != 0) {
3481 classfile_parse_error(
3482 "Multiple Signature attributes in class file %s", THREAD);
3483 return;
3484 }
3485 if (attribute_length != 2) {
3486 classfile_parse_error(
3487 "Wrong Signature attribute length %u in class file %s",
3488 attribute_length, THREAD);
3489 return;
3490 }
3491 parse_classfile_signature_attribute(cfs, CHECK);
3492 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3493 if (runtime_visible_annotations != nullptr) {
3494 classfile_parse_error(
3495 "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
3496 return;
3497 }
3498 runtime_visible_annotations_length = attribute_length;
3499 runtime_visible_annotations = cfs->current();
3500 assert(runtime_visible_annotations != nullptr, "null visible annotations");
3501 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3502 parse_annotations(cp,
3503 runtime_visible_annotations,
3504 runtime_visible_annotations_length,
3505 parsed_annotations,
3506 _loader_data,
3507 _can_access_vm_annotations);
3508 cfs->skip_u1_fast(runtime_visible_annotations_length);
3509 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3510 if (runtime_invisible_annotations_exists) {
3511 classfile_parse_error(
3512 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
3513 return;
3514 }
3515 runtime_invisible_annotations_exists = true;
3516 cfs->skip_u1(attribute_length, CHECK);
3517 } else if (tag == vmSymbols::tag_enclosing_method()) {
3518 if (parsed_enclosingmethod_attribute) {
3519 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
3520 return;
3521 } else {
3522 parsed_enclosingmethod_attribute = true;
3523 }
3524 guarantee_property(attribute_length == 4,
3525 "Wrong EnclosingMethod attribute length %u in class file %s",
3526 attribute_length, CHECK);
3527 cfs->guarantee_more(4, CHECK); // class_index, method_index
3528 enclosing_method_class_index = cfs->get_u2_fast();
3529 enclosing_method_method_index = cfs->get_u2_fast();
3530 if (enclosing_method_class_index == 0) {
3531 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
3532 return;
3533 }
3534 // Validate the constant pool indices and types
3535 guarantee_property(valid_klass_reference_at(enclosing_method_class_index),
3536 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3537 if (enclosing_method_method_index != 0 &&
3538 (!cp->is_within_bounds(enclosing_method_method_index) ||
3539 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3540 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
3541 return;
3542 }
3543 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3544 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3545 if (parsed_bootstrap_methods_attribute) {
3546 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
3547 return;
3548 }
3549 parsed_bootstrap_methods_attribute = true;
3550 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3551 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3552 if (runtime_visible_type_annotations != nullptr) {
3553 classfile_parse_error(
3554 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
3555 return;
3556 }
3557 runtime_visible_type_annotations_length = attribute_length;
3558 runtime_visible_type_annotations = cfs->current();
3559 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
3560 // No need for the VM to parse Type annotations
3561 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3562 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3563 if (runtime_invisible_type_annotations_exists) {
3564 classfile_parse_error(
3565 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
3566 return;
3567 }
3568 runtime_invisible_type_annotations_exists = true;
3569 cfs->skip_u1(attribute_length, CHECK);
3570 } else if (_major_version >= JAVA_11_VERSION) {
3571 if (tag == vmSymbols::tag_nest_members()) {
3572 // Check for NestMembers tag
3573 if (parsed_nest_members_attribute) {
3574 classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
3575 return;
3576 } else {
3577 parsed_nest_members_attribute = true;
3578 }
3579 if (parsed_nest_host_attribute) {
3580 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
3581 return;
3582 }
3583 nest_members_attribute_start = cfs->current();
3584 nest_members_attribute_length = attribute_length;
3585 cfs->skip_u1(nest_members_attribute_length, CHECK);
3586 } else if (tag == vmSymbols::tag_nest_host()) {
3587 if (parsed_nest_host_attribute) {
3588 classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
3589 return;
3590 } else {
3591 parsed_nest_host_attribute = true;
3592 }
3593 if (parsed_nest_members_attribute) {
3594 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
3595 return;
3596 }
3597 if (_need_verify) {
3598 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3599 }
3600 cfs->guarantee_more(2, CHECK);
3601 u2 class_info_index = cfs->get_u2_fast();
3602 guarantee_property(
3603 valid_klass_reference_at(class_info_index),
3604 "Nest-host class_info_index %u has bad constant type in class file %s",
3605 class_info_index, CHECK);
3606 _nest_host = class_info_index;
3607
3608 } else if (_major_version >= JAVA_16_VERSION) {
3609 if (tag == vmSymbols::tag_record()) {
3610 if (parsed_record_attribute) {
3611 classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
3612 return;
3613 }
3614 parsed_record_attribute = true;
3615 record_attribute_start = cfs->current();
3616 record_attribute_length = attribute_length;
3617 } else if (_major_version >= JAVA_17_VERSION) {
3618 if (tag == vmSymbols::tag_permitted_subclasses()) {
3619 if (parsed_permitted_subclasses_attribute) {
3620 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3621 return;
3622 }
3623 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3624 if (_access_flags.is_final()) {
3625 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3626 return;
3627 }
3628 parsed_permitted_subclasses_attribute = true;
3629 permitted_subclasses_attribute_start = cfs->current();
3630 permitted_subclasses_attribute_length = attribute_length;
3631 }
3632 }
3633 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3634 cfs->skip_u1(attribute_length, CHECK);
3635 } else {
3636 // Unknown attribute
3637 cfs->skip_u1(attribute_length, CHECK);
3638 }
3639 } else {
3640 // Unknown attribute
3641 cfs->skip_u1(attribute_length, CHECK);
3642 }
3643 } else {
3644 // Unknown attribute
3645 cfs->skip_u1(attribute_length, CHECK);
3646 }
3647 }
3648 _class_annotations = allocate_annotations(runtime_visible_annotations,
3649 runtime_visible_annotations_length,
3650 CHECK);
3651 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3652 runtime_visible_type_annotations_length,
3653 CHECK);
3654
3655 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3656 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3657 cfs,
3658 cp,
3659 inner_classes_attribute_start,
3660 parsed_innerclasses_attribute,
3661 enclosing_method_class_index,
3662 enclosing_method_method_index,
3663 CHECK);
3664 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3665 guarantee_property(
3666 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3667 "Wrong InnerClasses attribute length in class file %s", CHECK);
3668 }
3669 }
3670
3671 if (parsed_nest_members_attribute) {
3672 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3673 cfs,
3674 nest_members_attribute_start,
3675 CHECK);
3676 if (_need_verify) {
3677 guarantee_property(
3678 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3679 "Wrong NestMembers attribute length in class file %s", CHECK);
3680 }
3681 }
3682
3683 if (parsed_record_attribute) {
3684 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3685 cfs,
3686 cp,
3687 record_attribute_start,
3688 CHECK);
3689 if (_need_verify) {
3690 guarantee_property(record_attribute_length == calculated_attr_length,
3691 "Record attribute has wrong length in class file %s",
3692 CHECK);
3693 }
3694 }
3695
3696 if (parsed_permitted_subclasses_attribute) {
3697 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3698 cfs,
3699 permitted_subclasses_attribute_start,
3700 CHECK);
3701 if (_need_verify) {
3702 guarantee_property(
3703 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3704 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3705 }
3706 }
3707
3708 if (_max_bootstrap_specifier_index >= 0) {
3709 guarantee_property(parsed_bootstrap_methods_attribute,
3710 "Missing BootstrapMethods attribute in class file %s", CHECK);
3711 }
3712 }
3713
3714 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3715 assert(k != nullptr, "invariant");
3716
3717 if (_synthetic_flag)
3718 k->set_is_synthetic();
3719 if (_sourcefile_index != 0) {
3720 k->set_source_file_name_index(_sourcefile_index);
3721 }
3722 if (_generic_signature_index != 0) {
3723 k->set_generic_signature_index(_generic_signature_index);
3724 }
3725 if (_sde_buffer != nullptr) {
3726 k->set_source_debug_extension(_sde_buffer, _sde_length);
3727 }
3728 }
3729
3730 // Create the Annotations object that will
3731 // hold the annotations array for the Klass.
3732 void ClassFileParser::create_combined_annotations(TRAPS) {
3733 if (_class_annotations == nullptr &&
3734 _class_type_annotations == nullptr &&
3735 _fields_annotations == nullptr &&
3736 _fields_type_annotations == nullptr) {
3737 // Don't create the Annotations object unnecessarily.
3738 return;
3739 }
3740
3741 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3742 annotations->set_class_annotations(_class_annotations);
3743 annotations->set_class_type_annotations(_class_type_annotations);
3744 annotations->set_fields_annotations(_fields_annotations);
3745 annotations->set_fields_type_annotations(_fields_type_annotations);
3746
3747 // This is the Annotations object that will be
3748 // assigned to InstanceKlass being constructed.
3749 _combined_annotations = annotations;
3750
3751 // The annotations arrays below has been transferred the
3752 // _combined_annotations so these fields can now be cleared.
3753 _class_annotations = nullptr;
3754 _class_type_annotations = nullptr;
3755 _fields_annotations = nullptr;
3756 _fields_type_annotations = nullptr;
3757 }
3758
3759 // Transfer ownership of metadata allocated to the InstanceKlass.
3760 void ClassFileParser::apply_parsed_class_metadata(
3761 InstanceKlass* this_klass,
3762 int java_fields_count) {
3763 assert(this_klass != nullptr, "invariant");
3764
3765 _cp->set_pool_holder(this_klass);
3766 this_klass->set_constants(_cp);
3767 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3768 this_klass->set_fieldinfo_search_table(_fieldinfo_search_table);
3769 this_klass->set_fields_status(_fields_status);
3770 this_klass->set_methods(_methods);
3771 this_klass->set_inner_classes(_inner_classes);
3772 this_klass->set_nest_members(_nest_members);
3773 this_klass->set_nest_host_index(_nest_host);
3774 this_klass->set_annotations(_combined_annotations);
3775 this_klass->set_permitted_subclasses(_permitted_subclasses);
3776 this_klass->set_record_components(_record_components);
3777
3778 DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table));
3779
3780 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3781 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3782 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3783 // its _super. If an OOM occurs while loading the current klass, its _super field
3784 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3785 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3786 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3787
3788 // Clear out these fields so they don't get deallocated by the destructor
3789 clear_class_metadata();
3790 }
3791
3792 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3793 int anno_length,
3794 TRAPS) {
3795 AnnotationArray* annotations = nullptr;
3796 if (anno != nullptr) {
3797 annotations = MetadataFactory::new_array<u1>(_loader_data,
3798 anno_length,
3799 CHECK_(annotations));
3800 for (int i = 0; i < anno_length; i++) {
3801 annotations->at_put(i, anno[i]);
3802 }
3803 }
3804 return annotations;
3805 }
3806
3807 void ClassFileParser::check_super_class(ConstantPool* const cp,
3808 const int super_class_index,
3809 const bool need_verify,
3810 TRAPS) {
3811 assert(cp != nullptr, "invariant");
3812
3813 if (super_class_index == 0) {
3814 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
3815 "Invalid superclass index %u in class file %s",
3816 super_class_index,
3817 CHECK);
3818 } else {
3819 guarantee_property(valid_klass_reference_at(super_class_index),
3820 "Invalid superclass index %u in class file %s",
3821 super_class_index,
3822 CHECK);
3823
3824 // The class name should be legal because it is checked when parsing constant pool.
3825 // However, make sure it is not an array type.
3826 if (need_verify) {
3827 guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY,
3828 "Bad superclass name in class file %s", CHECK);
3829 }
3830 }
3831 }
3832
3833 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3834 _max_nonstatic_oop_maps = max_blocks;
3835 _nonstatic_oop_map_count = 0;
3836 if (max_blocks == 0) {
3837 _nonstatic_oop_maps = nullptr;
3838 } else {
3839 _nonstatic_oop_maps =
3840 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
3841 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3842 }
3843 }
3844
3845 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
3846 assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
3847 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
3848 }
3849
3850 // addition of super oop maps
3851 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3852 assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
3853 nof_blocks <= _max_nonstatic_oop_maps, "invariant");
3854
3855 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3856 _nonstatic_oop_map_count += nof_blocks;
3857 }
3858
3859 // collection of oops
3860 void OopMapBlocksBuilder::add(int offset, int count) {
3861 if (_nonstatic_oop_map_count == 0) {
3862 _nonstatic_oop_map_count++;
3863 }
3864 OopMapBlock* nonstatic_oop_map = last_oop_map();
3865 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
3866 nonstatic_oop_map->set_offset(offset);
3867 nonstatic_oop_map->set_count(count);
3868 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
3869 nonstatic_oop_map->increment_count(count);
3870 } else { // Need a new one...
3871 _nonstatic_oop_map_count++;
3872 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
3873 nonstatic_oop_map = last_oop_map();
3874 nonstatic_oop_map->set_offset(offset);
3875 nonstatic_oop_map->set_count(count);
3876 }
3877 }
3878
3879 // general purpose copy, e.g. into allocated instanceKlass
3880 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
3881 if (_nonstatic_oop_map_count != 0) {
3882 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
3883 }
3884 }
3885
3886 // Sort and compact adjacent blocks
3887 void OopMapBlocksBuilder::compact() {
3888 if (_nonstatic_oop_map_count <= 1) {
3889 return;
3890 }
3891 /*
3892 * Since field layout sneaks in oops before values, we will be able to condense
3893 * blocks. There is potential to compact between super, own refs and values
3894 * containing refs.
3895 *
3896 * Currently compaction is slightly limited due to values being 8 byte aligned.
3897 * This may well change: FixMe if it doesn't, the code below is fairly general purpose
3898 * and maybe it doesn't need to be.
3899 */
3900 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
3901 (_sort_Fn)OopMapBlock::compare_offset);
3902 if (_nonstatic_oop_map_count < 2) {
3903 return;
3904 }
3905
3906 // Make a temp copy, and iterate through and copy back into the original
3907 ResourceMark rm;
3908 OopMapBlock* oop_maps_copy =
3909 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
3910 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
3911 copy(oop_maps_copy);
3912 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
3913 unsigned int new_count = 1;
3914 oop_maps_copy++;
3915 while(oop_maps_copy < oop_maps_copy_end) {
3916 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
3917 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
3918 nonstatic_oop_map->increment_count(oop_maps_copy->count());
3919 } else {
3920 nonstatic_oop_map++;
3921 new_count++;
3922 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
3923 nonstatic_oop_map->set_count(oop_maps_copy->count());
3924 }
3925 oop_maps_copy++;
3926 }
3927 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
3928 _nonstatic_oop_map_count = new_count;
3929 }
3930
3931 void OopMapBlocksBuilder::print_on(outputStream* st) const {
3932 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
3933 if (_nonstatic_oop_map_count > 0) {
3934 OopMapBlock* map = _nonstatic_oop_maps;
3935 OopMapBlock* last_map = last_oop_map();
3936 assert(map <= last_map, "Last less than first");
3937 while (map <= last_map) {
3938 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
3939 map->offset() + map->offset_span() - heapOopSize, map->count());
3940 map++;
3941 }
3942 }
3943 }
3944
3945 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
3946 print_on(st);
3947 }
3948
3949 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
3950 assert(ik != nullptr, "invariant");
3951
3952 const InstanceKlass* const super = ik->super();
3953
3954 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3955 // in which case we don't have to register objects as finalizable
3956 if (!_has_empty_finalizer) {
3957 if (_has_finalizer ||
3958 (super != nullptr && super->has_finalizer())) {
3959 ik->set_has_finalizer();
3960 }
3961 }
3962
3963 #ifdef ASSERT
3964 bool f = false;
3965 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
3966 vmSymbols::void_method_signature());
3967 if (InstanceKlass::is_finalization_enabled() &&
3968 (m != nullptr) && !m->is_empty_method()) {
3969 f = true;
3970 }
3971
3972 // Spec doesn't prevent agent from redefinition of empty finalizer.
3973 // Despite the fact that it's generally bad idea and redefined finalizer
3974 // will not work as expected we shouldn't abort vm in this case
3975 if (!ik->has_redefined_this_or_super()) {
3976 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
3977 }
3978 #endif
3979
3980 // Check if this klass supports the java.lang.Cloneable interface
3981 if (vmClasses::Cloneable_klass_is_loaded()) {
3982 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
3983 ik->set_is_cloneable();
3984 }
3985 }
3986
3987 // If it cannot be fast-path allocated, set a bit in the layout helper.
3988 // See documentation of InstanceKlass::can_be_fastpath_allocated().
3989 assert(ik->size_helper() > 0, "layout_helper is initialized");
3990 if (ik->is_abstract() || ik->is_interface()
3991 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
3992 || ik->size_helper() >= FastAllocateSizeLimit) {
3993 // Forbid fast-path allocation.
3994 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
3995 ik->set_layout_helper(lh);
3996 }
3997
3998 // Propagate the AOT runtimeSetup method discovery
3999 if (_has_aot_runtime_setup_method) {
4000 ik->set_is_runtime_setup_required();
4001 if (log_is_enabled(Info, aot, init)) {
4002 ResourceMark rm;
4003 log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name());
4004 }
4005 }
4006 }
4007
4008 // utility methods for appending an array with check for duplicates
4009
4010 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4011 const Array<InstanceKlass*>* const ifs) {
4012 // iterate over new interfaces
4013 for (int i = 0; i < ifs->length(); i++) {
4014 InstanceKlass* const e = ifs->at(i);
4015 assert(e->is_klass() && e->is_interface(), "just checking");
4016 // add new interface
4017 result->append_if_missing(e);
4018 }
4019 }
4020
4021 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4022 Array<InstanceKlass*>* local_ifs,
4023 ClassLoaderData* loader_data,
4024 TRAPS) {
4025 assert(local_ifs != nullptr, "invariant");
4026 assert(loader_data != nullptr, "invariant");
4027
4028 // Compute maximum size for transitive interfaces
4029 int max_transitive_size = 0;
4030 int super_size = 0;
4031 // Add superclass transitive interfaces size
4032 if (super != nullptr) {
4033 super_size = super->transitive_interfaces()->length();
4034 max_transitive_size += super_size;
4035 }
4036 // Add local interfaces' super interfaces
4037 const int local_size = local_ifs->length();
4038 for (int i = 0; i < local_size; i++) {
4039 InstanceKlass* const l = local_ifs->at(i);
4040 max_transitive_size += l->transitive_interfaces()->length();
4041 }
4042 // Finally add local interfaces
4043 max_transitive_size += local_size;
4044 // Construct array
4045 if (max_transitive_size == 0) {
4046 // no interfaces, use canonicalized array
4047 return Universe::the_empty_instance_klass_array();
4048 } else if (max_transitive_size == super_size) {
4049 // no new local interfaces added, share superklass' transitive interface array
4050 return super->transitive_interfaces();
4051 } else if (max_transitive_size == local_size) {
4052 // only local interfaces added, share local interface array
4053 return local_ifs;
4054 } else {
4055 ResourceMark rm;
4056 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4057
4058 // Copy down from superclass
4059 if (super != nullptr) {
4060 append_interfaces(result, super->transitive_interfaces());
4061 }
4062
4063 // Copy down from local interfaces' superinterfaces
4064 for (int i = 0; i < local_size; i++) {
4065 InstanceKlass* const l = local_ifs->at(i);
4066 append_interfaces(result, l->transitive_interfaces());
4067 }
4068 // Finally add local interfaces
4069 append_interfaces(result, local_ifs);
4070
4071 // length will be less than the max_transitive_size if duplicates were removed
4072 const int length = result->length();
4073 assert(length <= max_transitive_size, "just checking");
4074 Array<InstanceKlass*>* const new_result =
4075 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4076 for (int i = 0; i < length; i++) {
4077 InstanceKlass* const e = result->at(i);
4078 assert(e != nullptr, "just checking");
4079 new_result->at_put(i, e);
4080 }
4081 return new_result;
4082 }
4083 }
4084
4085 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4086 assert(this_klass != nullptr, "invariant");
4087 const InstanceKlass* const super = this_klass->super();
4088
4089 if (super != nullptr) {
4090 if (super->is_final()) {
4091 classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD);
4092 return;
4093 }
4094
4095 if (super->is_sealed()) {
4096 stringStream ss;
4097 ResourceMark rm(THREAD);
4098 if (!super->has_as_permitted_subclass(this_klass, ss)) {
4099 classfile_icce_error(ss.as_string(), THREAD);
4100 return;
4101 }
4102 }
4103
4104 Reflection::VerifyClassAccessResults vca_result =
4105 Reflection::verify_class_access(this_klass, super, false);
4106 if (vca_result != Reflection::ACCESS_OK) {
4107 ResourceMark rm(THREAD);
4108 char* msg = Reflection::verify_class_access_msg(this_klass,
4109 super,
4110 vca_result);
4111
4112 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4113 if (msg == nullptr) {
4114 bool same_module = (this_klass->module() == super->module());
4115 Exceptions::fthrow(
4116 THREAD_AND_LOCATION,
4117 vmSymbols::java_lang_IllegalAccessError(),
4118 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4119 this_klass->external_name(),
4120 super->is_abstract() ? "abstract " : "",
4121 super->external_name(),
4122 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4123 (same_module) ? "" : "; ",
4124 (same_module) ? "" : super->class_in_module_of_loader());
4125 } else {
4126 // Add additional message content.
4127 Exceptions::fthrow(
4128 THREAD_AND_LOCATION,
4129 vmSymbols::java_lang_IllegalAccessError(),
4130 "superclass access check failed: %s",
4131 msg);
4132 }
4133 }
4134 }
4135 }
4136
4137
4138 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4139 assert(this_klass != nullptr, "invariant");
4140 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4141 const int lng = local_interfaces->length();
4142 for (int i = lng - 1; i >= 0; i--) {
4143 InstanceKlass* const k = local_interfaces->at(i);
4144 assert (k != nullptr && k->is_interface(), "invalid interface");
4145
4146 if (k->is_sealed()) {
4147 stringStream ss;
4148 ResourceMark rm(THREAD);
4149 if (!k->has_as_permitted_subclass(this_klass, ss)) {
4150 classfile_icce_error(ss.as_string(), THREAD);
4151 return;
4152 }
4153 }
4154
4155 Reflection::VerifyClassAccessResults vca_result =
4156 Reflection::verify_class_access(this_klass, k, false);
4157 if (vca_result != Reflection::ACCESS_OK) {
4158 ResourceMark rm(THREAD);
4159 char* msg = Reflection::verify_class_access_msg(this_klass,
4160 k,
4161 vca_result);
4162
4163 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4164 if (msg == nullptr) {
4165 bool same_module = (this_klass->module() == k->module());
4166 Exceptions::fthrow(
4167 THREAD_AND_LOCATION,
4168 vmSymbols::java_lang_IllegalAccessError(),
4169 "class %s cannot access its superinterface %s (%s%s%s)",
4170 this_klass->external_name(),
4171 k->external_name(),
4172 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4173 (same_module) ? "" : "; ",
4174 (same_module) ? "" : k->class_in_module_of_loader());
4175 return;
4176 } else {
4177 // Add additional message content.
4178 Exceptions::fthrow(
4179 THREAD_AND_LOCATION,
4180 vmSymbols::java_lang_IllegalAccessError(),
4181 "superinterface check failed: %s",
4182 msg);
4183 return;
4184 }
4185 }
4186 }
4187 }
4188
4189
4190 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4191 assert(this_klass != nullptr, "invariant");
4192 const Array<Method*>* const methods = this_klass->methods();
4193 const int num_methods = methods->length();
4194
4195 // go thru each method and check if it overrides a final method
4196 for (int index = 0; index < num_methods; index++) {
4197 const Method* const m = methods->at(index);
4198
4199 // skip private, static, and <init> methods
4200 if ((!m->is_private() && !m->is_static()) &&
4201 (m->name() != vmSymbols::object_initializer_name())) {
4202
4203 const Symbol* const name = m->name();
4204 const Symbol* const signature = m->signature();
4205 const InstanceKlass* k = this_klass->super();
4206 const Method* super_m = nullptr;
4207 while (k != nullptr) {
4208 // skip supers that don't have final methods.
4209 if (k->has_final_method()) {
4210 // lookup a matching method in the super class hierarchy
4211 super_m = k->lookup_method(name, signature);
4212 if (super_m == nullptr) {
4213 break; // didn't find any match; get out
4214 }
4215
4216 if (super_m->is_final() && !super_m->is_static() &&
4217 !super_m->access_flags().is_private()) {
4218 // matching method in super is final, and not static or private
4219 bool can_access = Reflection::verify_member_access(this_klass,
4220 super_m->method_holder(),
4221 super_m->method_holder(),
4222 super_m->access_flags(),
4223 false, false, CHECK);
4224 if (can_access) {
4225 // this class can access super final method and therefore override
4226 ResourceMark rm(THREAD);
4227 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
4228 err_msg("class %s overrides final method %s.%s%s",
4229 this_klass->external_name(),
4230 super_m->method_holder()->external_name(),
4231 name->as_C_string(),
4232 signature->as_C_string()));
4233 }
4234 }
4235
4236 // continue to look from super_m's holder's super.
4237 k = super_m->method_holder()->super();
4238 continue;
4239 }
4240
4241 k = k->super();
4242 }
4243 }
4244 }
4245 }
4246
4247
4248 // assumes that this_klass is an interface
4249 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4250 assert(this_klass != nullptr, "invariant");
4251 assert(this_klass->is_interface(), "not an interface");
4252 const Array<Method*>* methods = this_klass->methods();
4253 const int num_methods = methods->length();
4254
4255 for (int index = 0; index < num_methods; index++) {
4256 const Method* const m = methods->at(index);
4257 // if m is static and not the init method, throw a verify error
4258 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4259 ResourceMark rm(THREAD);
4260
4261 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4262 Exceptions::fthrow(
4263 THREAD_AND_LOCATION,
4264 vmSymbols::java_lang_VerifyError(),
4265 "Illegal static method %s in interface %s",
4266 m->name()->as_C_string(),
4267 this_klass->external_name()
4268 );
4269 return;
4270 }
4271 }
4272 }
4273
4274 // utility methods for format checking
4275
4276 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null.
4277 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const {
4278 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4279 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4280 if (is_module) {
4281 ResourceMark rm(THREAD);
4282 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4283 Exceptions::fthrow(
4284 THREAD_AND_LOCATION,
4285 vmSymbols::java_lang_NoClassDefFoundError(),
4286 "%s is not a class because access_flag ACC_MODULE is set",
4287 _class_name->as_C_string());
4288 return;
4289 }
4290
4291 if (!_need_verify) { return; }
4292
4293 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4294 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4295 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4296 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4297 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4298 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4299 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4300
4301 if ((is_abstract && is_final) ||
4302 (is_interface && !is_abstract) ||
4303 (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
4304 (!is_interface && major_gte_1_5 && is_annotation)) {
4305 ResourceMark rm(THREAD);
4306 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4307 if (inner_name == nullptr && !is_anonymous_inner_class) {
4308 Exceptions::fthrow(
4309 THREAD_AND_LOCATION,
4310 vmSymbols::java_lang_ClassFormatError(),
4311 "Illegal class modifiers in class %s: 0x%X",
4312 _class_name->as_C_string(), flags
4313 );
4314 } else {
4315 if (is_anonymous_inner_class) {
4316 Exceptions::fthrow(
4317 THREAD_AND_LOCATION,
4318 vmSymbols::java_lang_ClassFormatError(),
4319 "Illegal class modifiers in anonymous inner class of class %s: 0x%X",
4320 _class_name->as_C_string(), flags
4321 );
4322 } else {
4323 Exceptions::fthrow(
4324 THREAD_AND_LOCATION,
4325 vmSymbols::java_lang_ClassFormatError(),
4326 "Illegal class modifiers in inner class %s of class %s: 0x%X",
4327 inner_name->as_C_string(), _class_name->as_C_string(), flags
4328 );
4329 }
4330 }
4331 return;
4332 }
4333 }
4334
4335 static bool has_illegal_visibility(jint flags) {
4336 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4337 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4338 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4339
4340 return ((is_public && is_protected) ||
4341 (is_public && is_private) ||
4342 (is_protected && is_private));
4343 }
4344
4345 // A legal major_version.minor_version must be one of the following:
4346 //
4347 // Major_version >= 45 and major_version < 56, any minor_version.
4348 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4349 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4350 //
4351 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4352 ResourceMark rm(THREAD);
4353 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4354 if (major < JAVA_MIN_SUPPORTED_VERSION) {
4355 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
4356 class_name, major, minor, THREAD);
4357 return;
4358 }
4359
4360 if (major > max_version) {
4361 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4362 Exceptions::fthrow(
4363 THREAD_AND_LOCATION,
4364 vmSymbols::java_lang_UnsupportedClassVersionError(),
4365 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4366 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4367 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4368 return;
4369 }
4370
4371 if (major < JAVA_12_VERSION || minor == 0) {
4372 return;
4373 }
4374
4375 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4376 if (major != max_version) {
4377 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4378 Exceptions::fthrow(
4379 THREAD_AND_LOCATION,
4380 vmSymbols::java_lang_UnsupportedClassVersionError(),
4381 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4382 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4383 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4384 return;
4385 }
4386
4387 if (!Arguments::enable_preview()) {
4388 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4389 class_name, major, minor, THREAD);
4390 return;
4391 }
4392
4393 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4394 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4395 class_name, major, minor, THREAD);
4396 }
4397 }
4398
4399 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4400 bool is_interface,
4401 TRAPS) const {
4402 if (!_need_verify) { return; }
4403
4404 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4405 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4406 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4407 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4408 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4409 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4410 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4411 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4412 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4413
4414 bool is_illegal = false;
4415
4416 if (is_interface) {
4417 if (!is_public || !is_static || !is_final || is_private ||
4418 is_protected || is_volatile || is_transient ||
4419 (major_gte_1_5 && is_enum)) {
4420 is_illegal = true;
4421 }
4422 } else { // not interface
4423 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4424 is_illegal = true;
4425 }
4426 }
4427
4428 if (is_illegal) {
4429 ResourceMark rm(THREAD);
4430 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4431 Exceptions::fthrow(
4432 THREAD_AND_LOCATION,
4433 vmSymbols::java_lang_ClassFormatError(),
4434 "Illegal field modifiers in class %s: 0x%X",
4435 _class_name->as_C_string(), flags);
4436 return;
4437 }
4438 }
4439
4440 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4441 bool is_interface,
4442 const Symbol* name,
4443 TRAPS) const {
4444 if (!_need_verify) { return; }
4445
4446 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4447 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4448 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4449 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4450 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4451 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4452 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4453 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4454 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4455 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4456 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4457 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4458 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4459 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4460
4461 bool is_illegal = false;
4462
4463 if (is_interface) {
4464 if (major_gte_8) {
4465 // Class file version is JAVA_8_VERSION or later Methods of
4466 // interfaces may set any of the flags except ACC_PROTECTED,
4467 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4468 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4469 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4470 (is_native || is_protected || is_final || is_synchronized) ||
4471 // If a specific method of a class or interface has its
4472 // ACC_ABSTRACT flag set, it must not have any of its
4473 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4474 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4475 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4476 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4477 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4478 is_illegal = true;
4479 }
4480 } else if (major_gte_1_5) {
4481 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4482 if (!is_public || is_private || is_protected || is_static || is_final ||
4483 is_synchronized || is_native || !is_abstract || is_strict) {
4484 is_illegal = true;
4485 }
4486 } else {
4487 // Class file version is pre-JAVA_1_5_VERSION
4488 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4489 is_illegal = true;
4490 }
4491 }
4492 } else { // not interface
4493 if (has_illegal_visibility(flags)) {
4494 is_illegal = true;
4495 } else {
4496 if (is_initializer) {
4497 if (is_static || is_final || is_synchronized || is_native ||
4498 is_abstract || (major_gte_1_5 && is_bridge)) {
4499 is_illegal = true;
4500 }
4501 } else { // not initializer
4502 if (is_abstract) {
4503 if ((is_final || is_native || is_private || is_static ||
4504 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4505 is_illegal = true;
4506 }
4507 }
4508 }
4509 }
4510 }
4511
4512 if (is_illegal) {
4513 ResourceMark rm(THREAD);
4514 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4515 Exceptions::fthrow(
4516 THREAD_AND_LOCATION,
4517 vmSymbols::java_lang_ClassFormatError(),
4518 "Method %s in class %s has illegal modifiers: 0x%X",
4519 name->as_C_string(), _class_name->as_C_string(), flags);
4520 return;
4521 }
4522 }
4523
4524 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4525 int length,
4526 TRAPS) const {
4527 assert(_need_verify, "only called when _need_verify is true");
4528 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4529 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4530 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4531 }
4532 }
4533
4534 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4535 // In class names, '/' separates unqualified names. This is verified in this function also.
4536 // Method names also may not contain the characters '<' or '>', unless <init>
4537 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4538 // method. Because these names have been checked as special cases before
4539 // calling this method in verify_legal_method_name.
4540 //
4541 // This method is also called from the modular system APIs in modules.cpp
4542 // to verify the validity of module and package names.
4543 bool ClassFileParser::verify_unqualified_name(const char* name,
4544 unsigned int length,
4545 int type) {
4546 if (length == 0) return false; // Must have at least one char.
4547 for (const char* p = name; p != name + length; p++) {
4548 switch(*p) {
4549 case JVM_SIGNATURE_DOT:
4550 case JVM_SIGNATURE_ENDCLASS:
4551 case JVM_SIGNATURE_ARRAY:
4552 // do not permit '.', ';', or '['
4553 return false;
4554 case JVM_SIGNATURE_SLASH:
4555 // check for '//' or leading or trailing '/' which are not legal
4556 // unqualified name must not be empty
4557 if (type == ClassFileParser::LegalClass) {
4558 if (p == name || p+1 >= name+length ||
4559 *(p+1) == JVM_SIGNATURE_SLASH) {
4560 return false;
4561 }
4562 } else {
4563 return false; // do not permit '/' unless it's class name
4564 }
4565 break;
4566 case JVM_SIGNATURE_SPECIAL:
4567 case JVM_SIGNATURE_ENDSPECIAL:
4568 // do not permit '<' or '>' in method names
4569 if (type == ClassFileParser::LegalMethod) {
4570 return false;
4571 }
4572 }
4573 }
4574 return true;
4575 }
4576
4577 // Take pointer to a UTF8 byte string (not NUL-terminated).
4578 // Skip over the longest part of the string that could
4579 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4580 // Return a pointer to just past the fieldname.
4581 // Return null if no fieldname at all was found, or in the case of slash_ok
4582 // being true, we saw consecutive slashes (meaning we were looking for a
4583 // qualified path but found something that was badly-formed).
4584 static const char* skip_over_field_name(const char* const name,
4585 bool slash_ok,
4586 unsigned int length) {
4587 const char* p;
4588 jboolean last_is_slash = false;
4589 jboolean not_first_ch = false;
4590
4591 for (p = name; p != name + length; not_first_ch = true) {
4592 const char* old_p = p;
4593 jchar ch = *p;
4594 if (ch < 128) {
4595 p++;
4596 // quick check for ascii
4597 if ((ch >= 'a' && ch <= 'z') ||
4598 (ch >= 'A' && ch <= 'Z') ||
4599 (ch == '_' || ch == '$') ||
4600 (not_first_ch && ch >= '0' && ch <= '9')) {
4601 last_is_slash = false;
4602 continue;
4603 }
4604 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
4605 if (last_is_slash) {
4606 return nullptr; // Don't permit consecutive slashes
4607 }
4608 last_is_slash = true;
4609 continue;
4610 }
4611 }
4612 else {
4613 jint unicode_ch;
4614 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4615 p = tmp_p;
4616 last_is_slash = false;
4617 // Check if ch is Java identifier start or is Java identifier part
4618 // 4672820: call java.lang.Character methods directly without generating separate tables.
4619 EXCEPTION_MARK;
4620 // return value
4621 JavaValue result(T_BOOLEAN);
4622 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
4623 JavaCallArguments args;
4624 args.push_int(unicode_ch);
4625
4626 if (not_first_ch) {
4627 // public static boolean isJavaIdentifierPart(char ch);
4628 JavaCalls::call_static(&result,
4629 vmClasses::Character_klass(),
4630 vmSymbols::isJavaIdentifierPart_name(),
4631 vmSymbols::int_bool_signature(),
4632 &args,
4633 THREAD);
4634 } else {
4635 // public static boolean isJavaIdentifierStart(char ch);
4636 JavaCalls::call_static(&result,
4637 vmClasses::Character_klass(),
4638 vmSymbols::isJavaIdentifierStart_name(),
4639 vmSymbols::int_bool_signature(),
4640 &args,
4641 THREAD);
4642 }
4643 if (HAS_PENDING_EXCEPTION) {
4644 CLEAR_PENDING_EXCEPTION;
4645 return nullptr;
4646 }
4647 if(result.get_jboolean()) {
4648 continue;
4649 }
4650 }
4651 return (not_first_ch) ? old_p : nullptr;
4652 }
4653 return (not_first_ch && !last_is_slash) ? p : nullptr;
4654 }
4655
4656 // Take pointer to a UTF8 byte string (not NUL-terminated).
4657 // Skip over the longest part of the string that could
4658 // be taken as a field signature. Allow "void" if void_ok.
4659 // Return a pointer to just past the signature.
4660 // Return null if no legal signature is found.
4661 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4662 bool void_ok,
4663 unsigned int length,
4664 TRAPS) const {
4665 unsigned int array_dim = 0;
4666 while (length > 0) {
4667 switch (signature[0]) {
4668 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4669 case JVM_SIGNATURE_BOOLEAN:
4670 case JVM_SIGNATURE_BYTE:
4671 case JVM_SIGNATURE_CHAR:
4672 case JVM_SIGNATURE_SHORT:
4673 case JVM_SIGNATURE_INT:
4674 case JVM_SIGNATURE_FLOAT:
4675 case JVM_SIGNATURE_LONG:
4676 case JVM_SIGNATURE_DOUBLE:
4677 return signature + 1;
4678 case JVM_SIGNATURE_CLASS: {
4679 if (_major_version < JAVA_1_5_VERSION) {
4680 signature++;
4681 length--;
4682 // Skip over the class name if one is there
4683 const char* const p = skip_over_field_name(signature, true, length);
4684 assert(p == nullptr || p > signature, "must parse one character at least");
4685 // The next character better be a semicolon
4686 if (p != nullptr && // Parse of field name succeeded.
4687 p - signature < static_cast<int>(length) && // There is at least one character left to parse.
4688 p[0] == JVM_SIGNATURE_ENDCLASS) {
4689 return p + 1;
4690 }
4691 }
4692 else {
4693 // Skip leading 'L' and ignore first appearance of ';'
4694 signature++;
4695 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4696 // Format check signature
4697 if (c != nullptr) {
4698 int newlen = pointer_delta_as_int(c, (char*) signature);
4699 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4700 if (!legal) {
4701 classfile_parse_error("Class name is empty or contains illegal character "
4702 "in descriptor in class file %s",
4703 THREAD);
4704 return nullptr;
4705 }
4706 return signature + newlen + 1;
4707 }
4708 }
4709 return nullptr;
4710 }
4711 case JVM_SIGNATURE_ARRAY:
4712 array_dim++;
4713 if (array_dim > 255) {
4714 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4715 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
4716 return nullptr;
4717 }
4718 // The rest of what's there better be a legal signature
4719 signature++;
4720 length--;
4721 void_ok = false;
4722 break;
4723 default:
4724 return nullptr;
4725 }
4726 }
4727 return nullptr;
4728 }
4729
4730 // Checks if name is a legal class name.
4731 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4732 if (!_need_verify) { return; }
4733
4734 assert(name->refcount() > 0, "symbol must be kept alive");
4735 char* bytes = (char*)name->bytes();
4736 unsigned int length = name->utf8_length();
4737 bool legal = false;
4738
4739 if (length > 0) {
4740 const char* p;
4741 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4742 p = skip_over_field_signature(bytes, false, length, CHECK);
4743 legal = (p != nullptr) && ((p - bytes) == (int)length);
4744 } else if (_major_version < JAVA_1_5_VERSION) {
4745 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4746 p = skip_over_field_name(bytes, true, length);
4747 legal = (p != nullptr) && ((p - bytes) == (int)length);
4748 }
4749 } else {
4750 // 4900761: relax the constraints based on JSR202 spec
4751 // Class names may be drawn from the entire Unicode character set.
4752 // Identifiers between '/' must be unqualified names.
4753 // The utf8 string has been verified when parsing cpool entries.
4754 legal = verify_unqualified_name(bytes, length, LegalClass);
4755 }
4756 }
4757 if (!legal) {
4758 ResourceMark rm(THREAD);
4759 assert(_class_name != nullptr, "invariant");
4760 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4761 Exceptions::fthrow(
4762 THREAD_AND_LOCATION,
4763 vmSymbols::java_lang_ClassFormatError(),
4764 "Illegal class name \"%.*s\" in class file %s", length, bytes,
4765 _class_name->as_C_string()
4766 );
4767 return;
4768 }
4769 }
4770
4771 // Checks if name is a legal field name.
4772 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
4773 if (!_need_verify) { return; }
4774
4775 char* bytes = (char*)name->bytes();
4776 unsigned int length = name->utf8_length();
4777 bool legal = false;
4778
4779 if (length > 0) {
4780 if (_major_version < JAVA_1_5_VERSION) {
4781 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4782 const char* p = skip_over_field_name(bytes, false, length);
4783 legal = (p != nullptr) && ((p - bytes) == (int)length);
4784 }
4785 } else {
4786 // 4881221: relax the constraints based on JSR202 spec
4787 legal = verify_unqualified_name(bytes, length, LegalField);
4788 }
4789 }
4790
4791 if (!legal) {
4792 ResourceMark rm(THREAD);
4793 assert(_class_name != nullptr, "invariant");
4794 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4795 Exceptions::fthrow(
4796 THREAD_AND_LOCATION,
4797 vmSymbols::java_lang_ClassFormatError(),
4798 "Illegal field name \"%.*s\" in class %s", length, bytes,
4799 _class_name->as_C_string()
4800 );
4801 return;
4802 }
4803 }
4804
4805 // Checks if name is a legal method name.
4806 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
4807 if (!_need_verify) { return; }
4808
4809 assert(name != nullptr, "method name is null");
4810 char* bytes = (char*)name->bytes();
4811 unsigned int length = name->utf8_length();
4812 bool legal = false;
4813
4814 if (length > 0) {
4815 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
4816 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4817 legal = true;
4818 }
4819 } else if (_major_version < JAVA_1_5_VERSION) {
4820 const char* p;
4821 p = skip_over_field_name(bytes, false, length);
4822 legal = (p != nullptr) && ((p - bytes) == (int)length);
4823 } else {
4824 // 4881221: relax the constraints based on JSR202 spec
4825 legal = verify_unqualified_name(bytes, length, LegalMethod);
4826 }
4827 }
4828
4829 if (!legal) {
4830 ResourceMark rm(THREAD);
4831 assert(_class_name != nullptr, "invariant");
4832 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4833 Exceptions::fthrow(
4834 THREAD_AND_LOCATION,
4835 vmSymbols::java_lang_ClassFormatError(),
4836 "Illegal method name \"%.*s\" in class %s", length, bytes,
4837 _class_name->as_C_string()
4838 );
4839 return;
4840 }
4841 }
4842
4843
4844 // Checks if signature is a legal field signature.
4845 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
4846 const Symbol* signature,
4847 TRAPS) const {
4848 if (!_need_verify) { return; }
4849
4850 const char* const bytes = (const char*)signature->bytes();
4851 const unsigned int length = signature->utf8_length();
4852 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
4853
4854 if (p == nullptr || (p - bytes) != (int)length) {
4855 throwIllegalSignature("Field", name, signature, CHECK);
4856 }
4857 }
4858
4859 // Check that the signature is compatible with the method name. For example,
4860 // check that <init> has a void signature.
4861 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
4862 const Symbol* signature,
4863 TRAPS) const {
4864 if (!_need_verify) {
4865 return;
4866 }
4867
4868 // Class initializers cannot have args for class format version >= 51.
4869 if (name == vmSymbols::class_initializer_name() &&
4870 signature != vmSymbols::void_method_signature() &&
4871 _major_version >= JAVA_7_VERSION) {
4872 throwIllegalSignature("Method", name, signature, THREAD);
4873 return;
4874 }
4875
4876 int sig_length = signature->utf8_length();
4877 if (name->utf8_length() > 0 &&
4878 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
4879 sig_length > 0 &&
4880 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
4881 throwIllegalSignature("Method", name, signature, THREAD);
4882 }
4883 }
4884
4885 // Checks if signature is a legal method signature.
4886 // Returns number of parameters
4887 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
4888 const Symbol* signature,
4889 TRAPS) const {
4890 if (!_need_verify) {
4891 // make sure caller's args_size will be less than 0 even for non-static
4892 // method so it will be recomputed in compute_size_of_parameters().
4893 return -2;
4894 }
4895
4896 unsigned int args_size = 0;
4897 const char* p = (const char*)signature->bytes();
4898 unsigned int length = signature->utf8_length();
4899 const char* nextp;
4900
4901 // The first character must be a '('
4902 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4903 length--;
4904 // Skip over legal field signatures
4905 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4906 while ((length > 0) && (nextp != nullptr)) {
4907 args_size++;
4908 if (p[0] == 'J' || p[0] == 'D') {
4909 args_size++;
4910 }
4911 length -= pointer_delta_as_int(nextp, p);
4912 p = nextp;
4913 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4914 }
4915 // The first non-signature thing better be a ')'
4916 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4917 length--;
4918 // Now we better just have a return value
4919 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4920 if (nextp && ((int)length == (nextp - p))) {
4921 return args_size;
4922 }
4923 }
4924 }
4925 // Report error
4926 throwIllegalSignature("Method", name, signature, THREAD);
4927 return 0;
4928 }
4929
4930 int ClassFileParser::static_field_size() const {
4931 assert(_field_info != nullptr, "invariant");
4932 return _field_info->_static_field_size;
4933 }
4934
4935 int ClassFileParser::total_oop_map_count() const {
4936 assert(_field_info != nullptr, "invariant");
4937 return _field_info->oop_map_blocks->_nonstatic_oop_map_count;
4938 }
4939
4940 jint ClassFileParser::layout_size() const {
4941 assert(_field_info != nullptr, "invariant");
4942 return _field_info->_instance_size;
4943 }
4944
4945 static void check_methods_for_intrinsics(const InstanceKlass* ik,
4946 const Array<Method*>* methods) {
4947 assert(ik != nullptr, "invariant");
4948 assert(methods != nullptr, "invariant");
4949
4950 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4951 // (We used to do this lazily, but now we query it in Rewriter,
4952 // which is eagerly done for every method, so we might as well do it now,
4953 // when everything is fresh in memory.)
4954 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
4955
4956 if (klass_id != vmSymbolID::NO_SID) {
4957 for (int j = 0; j < methods->length(); ++j) {
4958 Method* method = methods->at(j);
4959 method->init_intrinsic_id(klass_id);
4960
4961 if (CheckIntrinsics) {
4962 // Check if an intrinsic is defined for method 'method',
4963 // but the method is not annotated with @IntrinsicCandidate.
4964 if (method->intrinsic_id() != vmIntrinsics::_none &&
4965 !method->intrinsic_candidate()) {
4966 tty->print("Compiler intrinsic is defined for method [%s], "
4967 "but the method is not annotated with @IntrinsicCandidate.%s",
4968 method->name_and_sig_as_C_string(),
4969 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
4970 );
4971 tty->cr();
4972 DEBUG_ONLY(vm_exit(1));
4973 }
4974 // Check is the method 'method' is annotated with @IntrinsicCandidate,
4975 // but there is no intrinsic available for it.
4976 if (method->intrinsic_candidate() &&
4977 method->intrinsic_id() == vmIntrinsics::_none) {
4978 tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
4979 "but no compiler intrinsic is defined for the method.%s",
4980 method->name_and_sig_as_C_string(),
4981 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
4982 );
4983 tty->cr();
4984 DEBUG_ONLY(vm_exit(1));
4985 }
4986 }
4987 } // end for
4988
4989 #ifdef ASSERT
4990 if (CheckIntrinsics) {
4991 // Check for orphan methods in the current class. A method m
4992 // of a class C is orphan if an intrinsic is defined for method m,
4993 // but class C does not declare m.
4994 // The check is potentially expensive, therefore it is available
4995 // only in debug builds.
4996
4997 for (auto id : EnumRange<vmIntrinsicID>{}) {
4998 if (vmIntrinsics::_compiledLambdaForm == id) {
4999 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5000 // generated for the JVM from a LambdaForm and therefore no method
5001 // is defined for it.
5002 continue;
5003 }
5004 if (vmIntrinsics::_blackhole == id) {
5005 // The _blackhole intrinsic is a special marker. No explicit method
5006 // is defined for it.
5007 continue;
5008 }
5009
5010 if (vmIntrinsics::class_for(id) == klass_id) {
5011 // Check if the current class contains a method with the same
5012 // name, flags, signature.
5013 bool match = false;
5014 for (int j = 0; j < methods->length(); ++j) {
5015 const Method* method = methods->at(j);
5016 if (method->intrinsic_id() == id) {
5017 match = true;
5018 break;
5019 }
5020 }
5021
5022 if (!match) {
5023 char buf[1000];
5024 tty->print("Compiler intrinsic is defined for method [%s], "
5025 "but the method is not available in class [%s].%s",
5026 vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
5027 ik->name()->as_C_string(),
5028 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5029 );
5030 tty->cr();
5031 DEBUG_ONLY(vm_exit(1));
5032 }
5033 }
5034 } // end for
5035 } // CheckIntrinsics
5036 #endif // ASSERT
5037 }
5038 }
5039
5040 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5041 const ClassInstanceInfo& cl_inst_info,
5042 TRAPS) {
5043 if (_klass != nullptr) {
5044 return _klass;
5045 }
5046
5047 InstanceKlass* const ik =
5048 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5049
5050 if (is_hidden()) {
5051 mangle_hidden_class_name(ik);
5052 }
5053
5054 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5055
5056 assert(_klass == ik, "invariant");
5057
5058 return ik;
5059 }
5060
5061 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5062 bool changed_by_loadhook,
5063 const ClassInstanceInfo& cl_inst_info,
5064 TRAPS) {
5065 assert(ik != nullptr, "invariant");
5066
5067 // Set name and CLD before adding to CLD
5068 ik->set_class_loader_data(_loader_data);
5069 ik->set_class_loader_type();
5070 ik->set_name(_class_name);
5071
5072 // Add all classes to our internal class loader list here,
5073 // including classes in the bootstrap (null) class loader.
5074 const bool publicize = !is_internal();
5075
5076 _loader_data->add_class(ik, publicize);
5077
5078 set_klass_to_deallocate(ik);
5079
5080 assert(_field_info != nullptr, "invariant");
5081 assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5082 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5083 "sanity");
5084
5085 assert(ik->is_instance_klass(), "sanity");
5086 assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5087
5088 // Fill in information already parsed
5089 ik->set_should_verify_class(_need_verify);
5090
5091 // Not yet: supers are done below to support the new subtype-checking fields
5092 ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5093 ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5094 ik->set_static_oop_field_count(_static_oop_count);
5095
5096 // this transfers ownership of a lot of arrays from
5097 // the parser onto the InstanceKlass*
5098 apply_parsed_class_metadata(ik, _java_fields_count);
5099
5100 // can only set dynamic nest-host after static nest information is set
5101 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5102 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5103 }
5104
5105 // note that is not safe to use the fields in the parser from this point on
5106 assert(nullptr == _cp, "invariant");
5107 assert(nullptr == _fieldinfo_stream, "invariant");
5108 assert(nullptr == _fieldinfo_search_table, "invariant");
5109 assert(nullptr == _fields_status, "invariant");
5110 assert(nullptr == _methods, "invariant");
5111 assert(nullptr == _inner_classes, "invariant");
5112 assert(nullptr == _nest_members, "invariant");
5113 assert(nullptr == _combined_annotations, "invariant");
5114 assert(nullptr == _record_components, "invariant");
5115 assert(nullptr == _permitted_subclasses, "invariant");
5116
5117 if (_has_localvariable_table) {
5118 ik->set_has_localvariable_table(true);
5119 }
5120
5121 if (_has_final_method) {
5122 ik->set_has_final_method();
5123 }
5124
5125 ik->copy_method_ordering(_method_ordering, CHECK);
5126 // The InstanceKlass::_methods_jmethod_ids cache
5127 // is managed on the assumption that the initial cache
5128 // size is equal to the number of methods in the class. If
5129 // that changes, then InstanceKlass::idnum_can_increment()
5130 // has to be changed accordingly.
5131 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5132
5133 ik->set_this_class_index(_this_class_index);
5134
5135 if (_is_hidden) {
5136 // _this_class_index is a CONSTANT_Class entry that refers to this
5137 // hidden class itself. If this class needs to refer to its own methods
5138 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5139 // _this_class_index. However, because this class is hidden (it's
5140 // not stored in SystemDictionary), _this_class_index cannot be resolved
5141 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5142 // Therefore, we must eagerly resolve _this_class_index now.
5143 ik->constants()->klass_at_put(_this_class_index, ik);
5144 }
5145
5146 ik->set_minor_version(_minor_version);
5147 ik->set_major_version(_major_version);
5148 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5149 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5150
5151 assert(!_is_hidden || ik->is_hidden(), "must be set already");
5152
5153 // Set PackageEntry for this_klass
5154 oop cl = ik->class_loader();
5155 Handle clh = Handle(THREAD, cl);
5156 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5157 ik->set_package(cld, nullptr, CHECK);
5158
5159 const Array<Method*>* const methods = ik->methods();
5160 assert(methods != nullptr, "invariant");
5161 const int methods_len = methods->length();
5162
5163 check_methods_for_intrinsics(ik, methods);
5164
5165 // Fill in field values obtained by parse_classfile_attributes
5166 if (_parsed_annotations->has_any_annotations())
5167 _parsed_annotations->apply_to(ik);
5168
5169 apply_parsed_class_attributes(ik);
5170
5171 // Miranda methods
5172 if ((_num_miranda_methods > 0) ||
5173 // if this class introduced new miranda methods or
5174 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5175 // super class exists and this class inherited miranda methods
5176 ) {
5177 ik->set_has_miranda_methods(); // then set a flag
5178 }
5179
5180 // Fill in information needed to compute superclasses.
5181 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5182 ik->set_transitive_interfaces(_transitive_interfaces);
5183 ik->set_local_interfaces(_local_interfaces);
5184 _transitive_interfaces = nullptr;
5185 _local_interfaces = nullptr;
5186
5187 // Initialize itable offset tables
5188 klassItable::setup_itable_offset_table(ik);
5189
5190 // Compute transitive closure of interfaces this class implements
5191 // Do final class setup
5192 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5193 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5194 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5195 }
5196
5197 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5198 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5199 ik->set_has_contended_annotations(true);
5200 }
5201
5202 // Fill in has_finalizer and layout_helper
5203 set_precomputed_flags(ik);
5204
5205 // check if this class can access its super class
5206 check_super_class_access(ik, CHECK);
5207
5208 // check if this class can access its superinterfaces
5209 check_super_interface_access(ik, CHECK);
5210
5211 // check if this class overrides any final method
5212 check_final_method_override(ik, CHECK);
5213
5214 // reject static interface methods prior to Java 8
5215 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5216 check_illegal_static_method(ik, CHECK);
5217 }
5218
5219 // Obtain this_klass' module entry
5220 ModuleEntry* module_entry = ik->module();
5221 assert(module_entry != nullptr, "module_entry should always be set");
5222
5223 // Obtain java.lang.Module
5224 Handle module_handle(THREAD, module_entry->module_oop());
5225
5226 // Allocate mirror and initialize static fields
5227 java_lang_Class::create_mirror(ik,
5228 Handle(THREAD, _loader_data->class_loader()),
5229 module_handle,
5230 _protection_domain,
5231 cl_inst_info.class_data(),
5232 CHECK);
5233
5234 assert(_all_mirandas != nullptr, "invariant");
5235
5236 // Generate any default methods - default methods are public interface methods
5237 // that have a default implementation. This is new with Java 8.
5238 if (_has_nonstatic_concrete_methods) {
5239 DefaultMethods::generate_default_methods(ik,
5240 _all_mirandas,
5241 CHECK);
5242 }
5243
5244 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5245 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5246 !module_entry->has_default_read_edges()) {
5247 if (!module_entry->set_has_default_read_edges()) {
5248 // We won a potential race
5249 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5250 }
5251 }
5252
5253 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5254
5255 if (!is_internal()) {
5256 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5257 if (CDSConfig::is_dumping_archive()) {
5258 SystemDictionaryShared::check_code_source(ik, _stream);
5259 }
5260
5261 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5262 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5263 log_is_enabled(Info, class, preview)) {
5264 ResourceMark rm;
5265 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5266 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5267 }
5268
5269 if (log_is_enabled(Debug, class, resolve)) {
5270 ResourceMark rm;
5271 // print out the superclass.
5272 const char * from = ik->external_name();
5273 if (ik->super() != nullptr) {
5274 log_debug(class, resolve)("%s %s (super)",
5275 from,
5276 ik->super()->external_name());
5277 }
5278 // print out each of the interface classes referred to by this class.
5279 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5280 if (local_interfaces != nullptr) {
5281 const int length = local_interfaces->length();
5282 for (int i = 0; i < length; i++) {
5283 const InstanceKlass* const k = local_interfaces->at(i);
5284 const char * to = k->external_name();
5285 log_debug(class, resolve)("%s %s (interface)", from, to);
5286 }
5287 }
5288 }
5289 }
5290
5291 // If we reach here, all is well.
5292 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5293 // in order for it to not be destroyed in the ClassFileParser destructor.
5294 set_klass_to_deallocate(nullptr);
5295
5296 // it's official
5297 set_klass(ik);
5298
5299 DEBUG_ONLY(ik->verify();)
5300 }
5301
5302 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5303 // Decrement the refcount in the old name, since we're clobbering it.
5304 _class_name->decrement_refcount();
5305
5306 _class_name = new_class_name;
5307 // Increment the refcount of the new name.
5308 // Now the ClassFileParser owns this name and will decrement in
5309 // the destructor.
5310 _class_name->increment_refcount();
5311 }
5312
5313 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5314 Symbol* name,
5315 ClassLoaderData* loader_data,
5316 const ClassLoadInfo* cl_info,
5317 Publicity pub_level,
5318 TRAPS) :
5319 _stream(stream),
5320 _class_name(nullptr),
5321 _loader_data(loader_data),
5322 _is_hidden(cl_info->is_hidden()),
5323 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5324 _orig_cp_size(0),
5325 _static_oop_count(0),
5326 _super_klass(),
5327 _cp(nullptr),
5328 _fieldinfo_stream(nullptr),
5329 _fieldinfo_search_table(nullptr),
5330 _fields_status(nullptr),
5331 _methods(nullptr),
5332 _inner_classes(nullptr),
5333 _nest_members(nullptr),
5334 _nest_host(0),
5335 _permitted_subclasses(nullptr),
5336 _record_components(nullptr),
5337 _local_interfaces(nullptr),
5338 _transitive_interfaces(nullptr),
5339 _combined_annotations(nullptr),
5340 _class_annotations(nullptr),
5341 _class_type_annotations(nullptr),
5342 _fields_annotations(nullptr),
5343 _fields_type_annotations(nullptr),
5344 _klass(nullptr),
5345 _klass_to_deallocate(nullptr),
5346 _parsed_annotations(nullptr),
5347 _field_info(nullptr),
5348 _temp_field_info(nullptr),
5349 _method_ordering(nullptr),
5350 _all_mirandas(nullptr),
5351 _vtable_size(0),
5352 _itable_size(0),
5353 _num_miranda_methods(0),
5354 _protection_domain(cl_info->protection_domain()),
5355 _access_flags(),
5356 _pub_level(pub_level),
5357 _bad_constant_seen(0),
5358 _synthetic_flag(false),
5359 _sde_length(false),
5360 _sde_buffer(nullptr),
5361 _sourcefile_index(0),
5362 _generic_signature_index(0),
5363 _major_version(0),
5364 _minor_version(0),
5365 _this_class_index(0),
5366 _super_class_index(0),
5367 _itfs_len(0),
5368 _java_fields_count(0),
5369 _need_verify(false),
5370 _has_nonstatic_concrete_methods(false),
5371 _declares_nonstatic_concrete_methods(false),
5372 _has_localvariable_table(false),
5373 _has_final_method(false),
5374 _has_contended_fields(false),
5375 _has_aot_runtime_setup_method(false),
5376 _has_finalizer(false),
5377 _has_empty_finalizer(false),
5378 _max_bootstrap_specifier_index(-1) {
5379
5380 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5381 _class_name->increment_refcount();
5382
5383 assert(_loader_data != nullptr, "invariant");
5384 assert(stream != nullptr, "invariant");
5385 assert(_stream != nullptr, "invariant");
5386 assert(_stream->buffer() == _stream->current(), "invariant");
5387 assert(_class_name != nullptr, "invariant");
5388 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5389
5390 // Figure out whether we can skip format checking (matching classic VM behavior)
5391 // Always verify CFLH bytes from the user agents.
5392 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5393
5394 // synch back verification state to stream to check for truncation.
5395 stream->set_need_verify(_need_verify);
5396
5397 parse_stream(stream, CHECK);
5398
5399 post_process_parsed_stream(stream, _cp, CHECK);
5400 }
5401
5402 void ClassFileParser::clear_class_metadata() {
5403 // metadata created before the instance klass is created. Must be
5404 // deallocated if classfile parsing returns an error.
5405 _cp = nullptr;
5406 _fieldinfo_stream = nullptr;
5407 _fieldinfo_search_table = nullptr;
5408 _fields_status = nullptr;
5409 _methods = nullptr;
5410 _inner_classes = nullptr;
5411 _nest_members = nullptr;
5412 _permitted_subclasses = nullptr;
5413 _combined_annotations = nullptr;
5414 _class_annotations = _class_type_annotations = nullptr;
5415 _fields_annotations = _fields_type_annotations = nullptr;
5416 _record_components = nullptr;
5417 }
5418
5419 // Destructor to clean up
5420 ClassFileParser::~ClassFileParser() {
5421 _class_name->decrement_refcount();
5422
5423 if (_cp != nullptr) {
5424 MetadataFactory::free_metadata(_loader_data, _cp);
5425 }
5426
5427 if (_fieldinfo_stream != nullptr) {
5428 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5429 }
5430 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table);
5431
5432 if (_fields_status != nullptr) {
5433 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5434 }
5435
5436 if (_methods != nullptr) {
5437 // Free methods
5438 InstanceKlass::deallocate_methods(_loader_data, _methods);
5439 }
5440
5441 // beware of the Universe::empty_blah_array!!
5442 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5443 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5444 }
5445
5446 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5447 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5448 }
5449
5450 if (_record_components != nullptr) {
5451 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5452 }
5453
5454 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5455 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5456 }
5457
5458 // Free interfaces
5459 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5460 _local_interfaces, _transitive_interfaces);
5461
5462 if (_combined_annotations != nullptr) {
5463 // After all annotations arrays have been created, they are installed into the
5464 // Annotations object that will be assigned to the InstanceKlass being created.
5465
5466 // Deallocate the Annotations object and the installed annotations arrays.
5467 _combined_annotations->deallocate_contents(_loader_data);
5468
5469 // If the _combined_annotations pointer is non-null,
5470 // then the other annotations fields should have been cleared.
5471 assert(_class_annotations == nullptr, "Should have been cleared");
5472 assert(_class_type_annotations == nullptr, "Should have been cleared");
5473 assert(_fields_annotations == nullptr, "Should have been cleared");
5474 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5475 } else {
5476 // If the annotations arrays were not installed into the Annotations object,
5477 // then they have to be deallocated explicitly.
5478 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
5479 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
5480 Annotations::free_contents(_loader_data, _fields_annotations);
5481 Annotations::free_contents(_loader_data, _fields_type_annotations);
5482 }
5483
5484 clear_class_metadata();
5485 _transitive_interfaces = nullptr;
5486 _local_interfaces = nullptr;
5487
5488 // deallocate the klass if already created. Don't directly deallocate, but add
5489 // to the deallocate list so that the klass is removed from the CLD::_klasses list
5490 // at a safepoint.
5491 if (_klass_to_deallocate != nullptr) {
5492 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5493 }
5494 }
5495
5496 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5497 TRAPS) {
5498
5499 assert(stream != nullptr, "invariant");
5500 assert(_class_name != nullptr, "invariant");
5501
5502 // BEGIN STREAM PARSING
5503 stream->guarantee_more(8, CHECK); // magic, major, minor
5504 // Magic value
5505 const u4 magic = stream->get_u4_fast();
5506 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5507 "Incompatible magic value %u in class file %s",
5508 magic, CHECK);
5509
5510 // Version numbers
5511 _minor_version = stream->get_u2_fast();
5512 _major_version = stream->get_u2_fast();
5513
5514 // Check version numbers - we check this even with verifier off
5515 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
5516
5517 stream->guarantee_more(3, CHECK); // length, first cp tag
5518 u2 cp_size = stream->get_u2_fast();
5519
5520 guarantee_property(
5521 cp_size >= 1, "Illegal constant pool size %u in class file %s",
5522 cp_size, CHECK);
5523
5524 _orig_cp_size = cp_size;
5525 if (is_hidden()) { // Add a slot for hidden class name.
5526 guarantee_property((u4)cp_size < 0xffff, "Overflow in constant pool size for hidden class %s", CHECK);
5527 cp_size++;
5528 }
5529
5530 _cp = ConstantPool::allocate(_loader_data,
5531 cp_size,
5532 CHECK);
5533
5534 ConstantPool* const cp = _cp;
5535
5536 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5537
5538 assert(cp_size == (u2)cp->length(), "invariant");
5539
5540 // ACCESS FLAGS
5541 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5542
5543 // Access flags
5544 u2 flags;
5545 // JVM_ACC_MODULE is defined in JDK-9 and later.
5546 if (_major_version >= JAVA_9_VERSION) {
5547 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5548 } else {
5549 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5550 }
5551
5552 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5553 // Set abstract bit for old class files for backward compatibility
5554 flags |= JVM_ACC_ABSTRACT;
5555 }
5556
5557 verify_legal_class_modifiers(flags, nullptr, false, CHECK);
5558
5559 short bad_constant = class_bad_constant_seen();
5560 if (bad_constant != 0) {
5561 // Do not throw CFE until after the access_flags are checked because if
5562 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5563 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5564 return;
5565 }
5566
5567 _access_flags.set_flags(flags);
5568
5569 // This class and superclass
5570 _this_class_index = stream->get_u2_fast();
5571 guarantee_property(
5572 valid_cp_range(_this_class_index, cp_size) &&
5573 cp->tag_at(_this_class_index).is_unresolved_klass(),
5574 "Invalid this class index %u in constant pool in class file %s",
5575 _this_class_index, CHECK);
5576
5577 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5578 assert(class_name_in_cp != nullptr, "class_name can't be null");
5579
5580 // Don't need to check whether this class name is legal or not.
5581 // It has been checked when constant pool is parsed.
5582 // However, make sure it is not an array type.
5583 if (_need_verify) {
5584 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
5585 "Bad class name in class file %s",
5586 CHECK);
5587 }
5588
5589 #ifdef ASSERT
5590 // Basic sanity checks
5591 if (_is_hidden) {
5592 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
5593 }
5594 #endif
5595
5596 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
5597
5598 if (_is_hidden) {
5599 assert(_class_name != nullptr, "Unexpected null _class_name");
5600 #ifdef ASSERT
5601 if (_need_verify) {
5602 verify_legal_class_name(_class_name, CHECK);
5603 }
5604 #endif
5605
5606 } else {
5607 // Check if name in class file matches given name
5608 if (_class_name != class_name_in_cp) {
5609 if (_class_name != vmSymbols::unknown_class_name()) {
5610 ResourceMark rm(THREAD);
5611 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5612 Exceptions::fthrow(THREAD_AND_LOCATION,
5613 vmSymbols::java_lang_NoClassDefFoundError(),
5614 "%s (wrong name: %s)",
5615 _class_name->as_C_string(),
5616 class_name_in_cp->as_C_string()
5617 );
5618 return;
5619 } else {
5620 // The class name was not known by the caller so we set it from
5621 // the value in the CP.
5622 update_class_name(class_name_in_cp);
5623 }
5624 // else nothing to do: the expected class name matches what is in the CP
5625 }
5626 }
5627
5628 // Verification prevents us from creating names with dots in them, this
5629 // asserts that that's the case.
5630 assert(is_internal_format(_class_name), "external class name format used internally");
5631
5632 if (!is_internal()) {
5633 LogTarget(Debug, class, preorder) lt;
5634 if (lt.is_enabled()){
5635 ResourceMark rm(THREAD);
5636 LogStream ls(lt);
5637 ls.print("%s", _class_name->as_klass_external_name());
5638 if (stream->source() != nullptr) {
5639 ls.print(" source: %s", stream->source());
5640 }
5641 ls.cr();
5642 }
5643 }
5644
5645 // SUPERKLASS
5646 _super_class_index = stream->get_u2_fast();
5647 check_super_class(cp,
5648 _super_class_index,
5649 _need_verify,
5650 CHECK);
5651
5652 // Interfaces
5653 _itfs_len = stream->get_u2_fast();
5654 parse_interfaces(stream,
5655 _itfs_len,
5656 cp,
5657 &_has_nonstatic_concrete_methods,
5658 CHECK);
5659
5660 assert(_local_interfaces != nullptr, "invariant");
5661
5662 // Fields (offsets are filled in later)
5663 parse_fields(stream,
5664 _access_flags.is_interface(),
5665 cp,
5666 cp_size,
5667 &_java_fields_count,
5668 CHECK);
5669
5670 assert(_temp_field_info != nullptr, "invariant");
5671
5672 // Methods
5673 parse_methods(stream,
5674 _access_flags.is_interface(),
5675 &_has_localvariable_table,
5676 &_has_final_method,
5677 &_declares_nonstatic_concrete_methods,
5678 CHECK);
5679
5680 assert(_methods != nullptr, "invariant");
5681
5682 if (_declares_nonstatic_concrete_methods) {
5683 _has_nonstatic_concrete_methods = true;
5684 }
5685
5686 // Additional attributes/annotations
5687 _parsed_annotations = new ClassAnnotationCollector();
5688 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
5689
5690 assert(_inner_classes != nullptr, "invariant");
5691
5692 // Finalize the Annotations metadata object,
5693 // now that all annotation arrays have been created.
5694 create_combined_annotations(CHECK);
5695
5696 // Make sure this is the end of class file stream
5697 guarantee_property(stream->at_eos(),
5698 "Extra bytes at the end of class file %s",
5699 CHECK);
5700
5701 // all bytes in stream read and parsed
5702 }
5703
5704 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
5705 ResourceMark rm;
5706 // Construct hidden name from _class_name, "+", and &ik. Note that we can't
5707 // use a '/' because that confuses finding the class's package. Also, can't
5708 // use an illegal char such as ';' because that causes serialization issues
5709 // and issues with hidden classes that create their own hidden classes.
5710 char addr_buf[20];
5711 if (CDSConfig::is_dumping_static_archive()) {
5712 // We want stable names for the archived hidden classes (only for static
5713 // archive for now). Spaces under default_SharedBaseAddress() will be
5714 // occupied by the archive at run time, so we know that no dynamically
5715 // loaded InstanceKlass will be placed under there.
5716 static volatile size_t counter = 0;
5717 AtomicAccess::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
5718 size_t new_id = AtomicAccess::add(&counter, (size_t)1);
5719 jio_snprintf(addr_buf, 20, "0x%zx", new_id);
5720 } else {
5721 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
5722 }
5723 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
5724 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
5725 jio_snprintf(new_name, new_name_len, "%s+%s",
5726 _class_name->as_C_string(), addr_buf);
5727 update_class_name(SymbolTable::new_symbol(new_name));
5728
5729 // Add a Utf8 entry containing the hidden name.
5730 assert(_class_name != nullptr, "Unexpected null _class_name");
5731 int hidden_index = _orig_cp_size; // this is an extra slot we added
5732 _cp->symbol_at_put(hidden_index, _class_name);
5733
5734 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
5735 // We have to update the resolved_klass_index and the name_index together
5736 // so extract the existing resolved_klass_index first.
5737 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
5738 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
5739 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
5740 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
5741 "Bad name_index");
5742 }
5743
5744 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
5745 ConstantPool* cp,
5746 TRAPS) {
5747 assert(stream != nullptr, "invariant");
5748 assert(stream->at_eos(), "invariant");
5749 assert(cp != nullptr, "invariant");
5750 assert(_loader_data != nullptr, "invariant");
5751
5752 if (_class_name == vmSymbols::java_lang_Object()) {
5753 precond(_super_class_index == 0);
5754 precond(_super_klass == nullptr);
5755 guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
5756 "java.lang.Object cannot implement an interface in class file %s",
5757 CHECK);
5758 } else {
5759 // Set _super_klass after class file is parsed and format is checked
5760 assert(_super_class_index > 0, "any class other than Object must have a super class");
5761 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
5762 if (_access_flags.is_interface()) {
5763 // Before attempting to resolve the superclass, check for class format
5764 // errors not checked yet.
5765 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
5766 "Interfaces must have java.lang.Object as superclass in class file %s",
5767 CHECK);
5768 }
5769 Handle loader(THREAD, _loader_data->class_loader());
5770 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
5771 // fast path to avoid lookup
5772 _super_klass = vmClasses::Object_klass();
5773 } else {
5774 _super_klass = (const InstanceKlass*)
5775 SystemDictionary::resolve_super_or_fail(_class_name,
5776 super_class_name,
5777 loader,
5778 true,
5779 CHECK);
5780 }
5781 }
5782
5783 if (_super_klass != nullptr) {
5784 if (_super_klass->has_nonstatic_concrete_methods()) {
5785 _has_nonstatic_concrete_methods = true;
5786 }
5787
5788 if (_super_klass->is_interface()) {
5789 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
5790 return;
5791 }
5792 }
5793
5794 // Compute the transitive list of all unique interfaces implemented by this class
5795 _transitive_interfaces =
5796 compute_transitive_interfaces(_super_klass,
5797 _local_interfaces,
5798 _loader_data,
5799 CHECK);
5800
5801 assert(_transitive_interfaces != nullptr, "invariant");
5802
5803 // sort methods
5804 _method_ordering = sort_methods(_methods);
5805
5806 _all_mirandas = new GrowableArray<Method*>(20);
5807
5808 Handle loader(THREAD, _loader_data->class_loader());
5809 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
5810 &_num_miranda_methods,
5811 _all_mirandas,
5812 _super_klass,
5813 _methods,
5814 _access_flags,
5815 _major_version,
5816 loader,
5817 _class_name,
5818 _local_interfaces);
5819
5820 // Size of Java itable (in words)
5821 _itable_size = _access_flags.is_interface() ? 0 :
5822 klassItable::compute_itable_size(_transitive_interfaces);
5823
5824 assert(_parsed_annotations != nullptr, "invariant");
5825
5826 _field_info = new FieldLayoutInfo();
5827 FieldLayoutBuilder lb(class_name(), super_klass(), _cp, /*_fields*/ _temp_field_info,
5828 _parsed_annotations->is_contended(), _field_info);
5829 lb.build_layout();
5830
5831 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
5832 _fieldinfo_stream =
5833 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
5834 injected_fields_count, loader_data(), CHECK);
5835 _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK);
5836 _fields_status =
5837 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
5838 FieldStatus(0), CHECK);
5839 }
5840
5841 void ClassFileParser::set_klass(InstanceKlass* klass) {
5842
5843 #ifdef ASSERT
5844 if (klass != nullptr) {
5845 assert(nullptr == _klass, "leaking?");
5846 }
5847 #endif
5848
5849 _klass = klass;
5850 }
5851
5852 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
5853
5854 #ifdef ASSERT
5855 if (klass != nullptr) {
5856 assert(nullptr == _klass_to_deallocate, "leaking?");
5857 }
5858 #endif
5859
5860 _klass_to_deallocate = klass;
5861 }
5862
5863 // Caller responsible for ResourceMark
5864 // clone stream with rewound position
5865 const ClassFileStream* ClassFileParser::clone_stream() const {
5866 assert(_stream != nullptr, "invariant");
5867
5868 return _stream->clone();
5869 }
5870
5871 ReferenceType ClassFileParser::super_reference_type() const {
5872 return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type();
5873 }
5874
5875 bool ClassFileParser::is_instance_ref_klass() const {
5876 // Only the subclasses of j.l.r.Reference are InstanceRefKlass.
5877 // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
5878 // klass requiring special treatment in ref-processing. The abstract
5879 // j.l.r.Reference cannot be instantiated so doesn't partake in
5880 // ref-processing.
5881 return is_java_lang_ref_Reference_subclass();
5882 }
5883
5884 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
5885 if (_super_klass == nullptr) {
5886 return false;
5887 }
5888
5889 if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
5890 // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
5891 return true;
5892 }
5893
5894 return _super_klass->reference_type() != REF_NONE;
5895 }
5896
5897 // ----------------------------------------------------------------------------
5898 // debugging
5899
5900 #ifdef ASSERT
5901
5902 // return true if class_name contains no '.' (internal format is '/')
5903 bool ClassFileParser::is_internal_format(Symbol* class_name) {
5904 if (class_name != nullptr) {
5905 ResourceMark rm;
5906 char* name = class_name->as_C_string();
5907 return strchr(name, JVM_SIGNATURE_DOT) == nullptr;
5908 } else {
5909 return true;
5910 }
5911 }
5912
5913 #endif