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