1 /*
2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24 #include "precompiled.hpp"
25 #include "jvm.h"
26 #include "aot/aotLoader.hpp"
27 #include "classfile/classFileParser.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/defaultMethods.hpp"
32 #include "classfile/dictionary.hpp"
33 #include "classfile/fieldLayoutBuilder.hpp"
34 #include "classfile/javaClasses.inline.hpp"
35 #include "classfile/moduleEntry.hpp"
36 #include "classfile/packageEntry.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/verificationType.hpp"
40 #include "classfile/verifier.hpp"
41 #include "classfile/vmSymbols.hpp"
42 #include "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "memory/allocation.hpp"
45 #include "memory/metadataFactory.hpp"
46 #include "memory/oopFactory.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "oops/annotations.hpp"
50 #include "oops/constantPool.inline.hpp"
51 #include "oops/fieldStreams.inline.hpp"
52 #include "oops/instanceKlass.hpp"
53 #include "oops/instanceMirrorKlass.hpp"
54 #include "oops/klass.inline.hpp"
55 #include "oops/klassVtable.hpp"
56 #include "oops/metadata.hpp"
57 #include "oops/method.inline.hpp"
58 #include "oops/oop.inline.hpp"
59 #include "oops/recordComponent.hpp"
60 #include "oops/symbol.hpp"
61 #include "prims/jvmtiExport.hpp"
62 #include "prims/jvmtiThreadState.hpp"
63 #include "runtime/arguments.hpp"
64 #include "runtime/fieldDescriptor.inline.hpp"
65 #include "runtime/handles.inline.hpp"
66 #include "runtime/javaCalls.hpp"
67 #include "runtime/os.hpp"
68 #include "runtime/perfData.hpp"
69 #include "runtime/reflection.hpp"
70 #include "runtime/safepointVerifiers.hpp"
71 #include "runtime/signature.hpp"
72 #include "runtime/timer.hpp"
73 #include "services/classLoadingService.hpp"
74 #include "services/threadService.hpp"
75 #include "utilities/align.hpp"
76 #include "utilities/bitMap.inline.hpp"
77 #include "utilities/copy.hpp"
78 #include "utilities/exceptions.hpp"
79 #include "utilities/globalDefinitions.hpp"
80 #include "utilities/growableArray.hpp"
81 #include "utilities/macros.hpp"
82 #include "utilities/ostream.hpp"
83 #include "utilities/resourceHash.hpp"
84 #include "utilities/utf8.hpp"
85
86 #if INCLUDE_CDS
87 #include "classfile/systemDictionaryShared.hpp"
88 #endif
89 #if INCLUDE_JFR
90 #include "jfr/support/jfrTraceIdExtension.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 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
138 assert((bad_constant == JVM_CONSTANT_Module ||
139 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
140 "Unexpected bad constant pool entry");
141 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
142 }
143
144 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
145 ConstantPool* cp,
146 const int length,
147 TRAPS) {
148 assert(stream != NULL, "invariant");
149 assert(cp != NULL, "invariant");
150
151 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
152 // this function (_current can be allocated in a register, with scalar
153 // replacement of aggregates). The _current pointer is copied back to
154 // stream() when this function returns. DON'T call another method within
155 // this method that uses stream().
156 const ClassFileStream cfs1 = *stream;
157 const ClassFileStream* const cfs = &cfs1;
158
159 assert(cfs->allocated_on_stack(), "should be local");
160 debug_only(const u1* const old_current = stream->current();)
161
162 // Used for batching symbol allocations.
163 const char* names[SymbolTable::symbol_alloc_batch_size];
164 int lengths[SymbolTable::symbol_alloc_batch_size];
165 int indices[SymbolTable::symbol_alloc_batch_size];
166 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
167 int names_count = 0;
168
169 // parsing Index 0 is unused
170 for (int index = 1; index < length; index++) {
171 // Each of the following case guarantees one more byte in the stream
172 // for the following tag or the access_flags following constant pool,
173 // so we don't need bounds-check for reading tag.
174 const u1 tag = cfs->get_u1_fast();
175 switch (tag) {
176 case JVM_CONSTANT_Class : {
177 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
178 const u2 name_index = cfs->get_u2_fast();
179 cp->klass_index_at_put(index, name_index);
180 break;
181 }
182 case JVM_CONSTANT_Fieldref: {
183 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
184 const u2 class_index = cfs->get_u2_fast();
185 const u2 name_and_type_index = cfs->get_u2_fast();
186 cp->field_at_put(index, class_index, name_and_type_index);
187 break;
188 }
189 case JVM_CONSTANT_Methodref: {
190 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
191 const u2 class_index = cfs->get_u2_fast();
192 const u2 name_and_type_index = cfs->get_u2_fast();
193 cp->method_at_put(index, class_index, name_and_type_index);
194 break;
195 }
196 case JVM_CONSTANT_InterfaceMethodref: {
197 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
198 const u2 class_index = cfs->get_u2_fast();
199 const u2 name_and_type_index = cfs->get_u2_fast();
200 cp->interface_method_at_put(index, class_index, name_and_type_index);
201 break;
202 }
203 case JVM_CONSTANT_String : {
204 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
205 const u2 string_index = cfs->get_u2_fast();
206 cp->string_index_at_put(index, string_index);
207 break;
208 }
209 case JVM_CONSTANT_MethodHandle :
210 case JVM_CONSTANT_MethodType: {
211 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
212 classfile_parse_error(
213 "Class file version does not support constant tag %u in class file %s",
214 tag, CHECK);
215 }
216 if (tag == JVM_CONSTANT_MethodHandle) {
217 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
218 const u1 ref_kind = cfs->get_u1_fast();
219 const u2 method_index = cfs->get_u2_fast();
220 cp->method_handle_index_at_put(index, ref_kind, method_index);
221 }
222 else if (tag == JVM_CONSTANT_MethodType) {
223 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
224 const u2 signature_index = cfs->get_u2_fast();
225 cp->method_type_index_at_put(index, signature_index);
226 }
227 else {
228 ShouldNotReachHere();
229 }
230 break;
231 }
232 case JVM_CONSTANT_Dynamic : {
233 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
234 classfile_parse_error(
235 "Class file version does not support constant tag %u in class file %s",
236 tag, CHECK);
237 }
238 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
239 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
240 const u2 name_and_type_index = cfs->get_u2_fast();
241 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
242 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
243 }
244 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
245 break;
246 }
247 case JVM_CONSTANT_InvokeDynamic : {
248 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
249 classfile_parse_error(
250 "Class file version does not support constant tag %u in class file %s",
251 tag, CHECK);
252 }
253 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
254 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
255 const u2 name_and_type_index = cfs->get_u2_fast();
256 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
257 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
258 }
259 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
260 break;
261 }
262 case JVM_CONSTANT_Integer: {
263 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
264 const u4 bytes = cfs->get_u4_fast();
265 cp->int_at_put(index, (jint)bytes);
266 break;
267 }
268 case JVM_CONSTANT_Float: {
269 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
270 const u4 bytes = cfs->get_u4_fast();
271 cp->float_at_put(index, *(jfloat*)&bytes);
272 break;
273 }
274 case JVM_CONSTANT_Long: {
275 // A mangled type might cause you to overrun allocated memory
276 guarantee_property(index + 1 < length,
277 "Invalid constant pool entry %u in class file %s",
278 index,
279 CHECK);
280 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
281 const u8 bytes = cfs->get_u8_fast();
282 cp->long_at_put(index, bytes);
283 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
284 break;
285 }
286 case JVM_CONSTANT_Double: {
287 // A mangled type might cause you to overrun allocated memory
288 guarantee_property(index+1 < length,
289 "Invalid constant pool entry %u in class file %s",
290 index,
291 CHECK);
292 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
293 const u8 bytes = cfs->get_u8_fast();
294 cp->double_at_put(index, *(jdouble*)&bytes);
295 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
296 break;
297 }
298 case JVM_CONSTANT_NameAndType: {
299 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
300 const u2 name_index = cfs->get_u2_fast();
301 const u2 signature_index = cfs->get_u2_fast();
302 cp->name_and_type_at_put(index, name_index, signature_index);
303 break;
304 }
305 case JVM_CONSTANT_Utf8 : {
306 cfs->guarantee_more(2, CHECK); // utf8_length
307 u2 utf8_length = cfs->get_u2_fast();
308 const u1* utf8_buffer = cfs->current();
309 assert(utf8_buffer != NULL, "null utf8 buffer");
310 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
311 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
312 cfs->skip_u1_fast(utf8_length);
313
314 // Before storing the symbol, make sure it's legal
315 if (_need_verify) {
316 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
317 }
318
319 if (has_cp_patch_at(index)) {
320 Handle patch = clear_cp_patch_at(index);
321 guarantee_property(java_lang_String::is_instance(patch()),
322 "Illegal utf8 patch at %d in class file %s",
323 index,
324 CHECK);
325 const char* const str = java_lang_String::as_utf8_string(patch());
326 // (could use java_lang_String::as_symbol instead, but might as well batch them)
327 utf8_buffer = (const u1*) str;
328 utf8_length = (u2) strlen(str);
329 }
330
331 unsigned int hash;
332 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
333 utf8_length,
334 hash);
335 if (result == NULL) {
336 names[names_count] = (const char*)utf8_buffer;
337 lengths[names_count] = utf8_length;
338 indices[names_count] = index;
339 hashValues[names_count++] = hash;
340 if (names_count == SymbolTable::symbol_alloc_batch_size) {
341 SymbolTable::new_symbols(_loader_data,
342 constantPoolHandle(THREAD, cp),
343 names_count,
344 names,
345 lengths,
346 indices,
347 hashValues);
348 names_count = 0;
349 }
350 } else {
351 cp->symbol_at_put(index, result);
352 }
353 break;
354 }
355 case JVM_CONSTANT_Module:
356 case JVM_CONSTANT_Package: {
357 // Record that an error occurred in these two cases but keep parsing so
358 // that ACC_Module can be checked for in the access_flags. Need to
359 // throw NoClassDefFoundError in that case.
360 if (_major_version >= JAVA_9_VERSION) {
361 cfs->guarantee_more(3, CHECK);
362 cfs->get_u2_fast();
363 set_class_bad_constant_seen(tag);
364 break;
365 }
366 }
367 default: {
368 classfile_parse_error("Unknown constant tag %u in class file %s",
369 tag,
370 CHECK);
371 break;
372 }
373 } // end of switch(tag)
374 } // end of for
375
376 // Allocate the remaining symbols
377 if (names_count > 0) {
378 SymbolTable::new_symbols(_loader_data,
379 constantPoolHandle(THREAD, cp),
380 names_count,
381 names,
382 lengths,
383 indices,
384 hashValues);
385 }
386
387 // Copy _current pointer of local copy back to stream.
388 assert(stream->current() == old_current, "non-exclusive use of stream");
389 stream->set_current(cfs1.current());
390
391 }
392
393 static inline bool valid_cp_range(int index, int length) {
394 return (index > 0 && index < length);
395 }
396
397 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
398 assert(cp != NULL, "invariant");
399 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
400 return cp->symbol_at(index);
401 }
402 return NULL;
403 }
404
405 #ifdef ASSERT
406 PRAGMA_DIAG_PUSH
407 PRAGMA_FORMAT_NONLITERAL_IGNORED
408 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
409 ResourceMark rm(THREAD);
410 fatal(msg, _class_name->as_C_string());
411 }
412
413 void ClassFileParser::report_assert_property_failure(const char* msg,
414 int index,
415 TRAPS) const {
416 ResourceMark rm(THREAD);
417 fatal(msg, index, _class_name->as_C_string());
418 }
419 PRAGMA_DIAG_POP
420 #endif
421
422 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
423 ConstantPool* const cp,
424 const int length,
425 TRAPS) {
426 assert(cp != NULL, "invariant");
427 assert(stream != NULL, "invariant");
428
429 // parsing constant pool entries
430 parse_constant_pool_entries(stream, cp, length, CHECK);
431 if (class_bad_constant_seen() != 0) {
432 // a bad CP entry has been detected previously so stop parsing and just return.
433 return;
434 }
435
436 int index = 1; // declared outside of loops for portability
437 int num_klasses = 0;
438
439 // first verification pass - validate cross references
440 // and fixup class and string constants
441 for (index = 1; index < length; index++) { // Index 0 is unused
442 const jbyte tag = cp->tag_at(index).value();
443 switch (tag) {
444 case JVM_CONSTANT_Class: {
445 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
446 break;
447 }
448 case JVM_CONSTANT_Fieldref:
449 // fall through
450 case JVM_CONSTANT_Methodref:
451 // fall through
452 case JVM_CONSTANT_InterfaceMethodref: {
453 if (!_need_verify) break;
454 const int klass_ref_index = cp->klass_ref_index_at(index);
455 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
456 check_property(valid_klass_reference_at(klass_ref_index),
457 "Invalid constant pool index %u in class file %s",
458 klass_ref_index, CHECK);
459 check_property(valid_cp_range(name_and_type_ref_index, length) &&
460 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
461 "Invalid constant pool index %u in class file %s",
462 name_and_type_ref_index, CHECK);
463 break;
464 }
465 case JVM_CONSTANT_String: {
466 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
467 break;
468 }
469 case JVM_CONSTANT_Integer:
470 break;
471 case JVM_CONSTANT_Float:
472 break;
473 case JVM_CONSTANT_Long:
474 case JVM_CONSTANT_Double: {
475 index++;
476 check_property(
477 (index < length && cp->tag_at(index).is_invalid()),
478 "Improper constant pool long/double index %u in class file %s",
479 index, CHECK);
480 break;
481 }
482 case JVM_CONSTANT_NameAndType: {
483 if (!_need_verify) break;
484 const int name_ref_index = cp->name_ref_index_at(index);
485 const int signature_ref_index = cp->signature_ref_index_at(index);
486 check_property(valid_symbol_at(name_ref_index),
487 "Invalid constant pool index %u in class file %s",
488 name_ref_index, CHECK);
489 check_property(valid_symbol_at(signature_ref_index),
490 "Invalid constant pool index %u in class file %s",
491 signature_ref_index, CHECK);
492 break;
493 }
494 case JVM_CONSTANT_Utf8:
495 break;
496 case JVM_CONSTANT_UnresolvedClass: // fall-through
497 case JVM_CONSTANT_UnresolvedClassInError: {
498 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
499 break;
500 }
501 case JVM_CONSTANT_ClassIndex: {
502 const int class_index = cp->klass_index_at(index);
503 check_property(valid_symbol_at(class_index),
504 "Invalid constant pool index %u in class file %s",
505 class_index, CHECK);
506 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
507 break;
508 }
509 case JVM_CONSTANT_StringIndex: {
510 const int string_index = cp->string_index_at(index);
511 check_property(valid_symbol_at(string_index),
512 "Invalid constant pool index %u in class file %s",
513 string_index, CHECK);
514 Symbol* const sym = cp->symbol_at(string_index);
515 cp->unresolved_string_at_put(index, sym);
516 break;
517 }
518 case JVM_CONSTANT_MethodHandle: {
519 const int ref_index = cp->method_handle_index_at(index);
520 check_property(valid_cp_range(ref_index, length),
521 "Invalid constant pool index %u in class file %s",
522 ref_index, CHECK);
523 const constantTag tag = cp->tag_at(ref_index);
524 const int ref_kind = cp->method_handle_ref_kind_at(index);
525
526 switch (ref_kind) {
527 case JVM_REF_getField:
528 case JVM_REF_getStatic:
529 case JVM_REF_putField:
530 case JVM_REF_putStatic: {
531 check_property(
532 tag.is_field(),
533 "Invalid constant pool index %u in class file %s (not a field)",
534 ref_index, CHECK);
535 break;
536 }
537 case JVM_REF_invokeVirtual:
538 case JVM_REF_newInvokeSpecial: {
539 check_property(
540 tag.is_method(),
541 "Invalid constant pool index %u in class file %s (not a method)",
542 ref_index, CHECK);
543 break;
544 }
545 case JVM_REF_invokeStatic:
546 case JVM_REF_invokeSpecial: {
547 check_property(
548 tag.is_method() ||
549 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
550 "Invalid constant pool index %u in class file %s (not a method)",
551 ref_index, CHECK);
552 break;
553 }
554 case JVM_REF_invokeInterface: {
555 check_property(
556 tag.is_interface_method(),
557 "Invalid constant pool index %u in class file %s (not an interface method)",
558 ref_index, CHECK);
559 break;
560 }
561 default: {
562 classfile_parse_error(
563 "Bad method handle kind at constant pool index %u in class file %s",
564 index, CHECK);
565 }
566 } // switch(refkind)
567 // Keep the ref_index unchanged. It will be indirected at link-time.
568 break;
569 } // case MethodHandle
570 case JVM_CONSTANT_MethodType: {
571 const int ref_index = cp->method_type_index_at(index);
572 check_property(valid_symbol_at(ref_index),
573 "Invalid constant pool index %u in class file %s",
574 ref_index, CHECK);
575 break;
576 }
577 case JVM_CONSTANT_Dynamic: {
578 const int name_and_type_ref_index =
579 cp->bootstrap_name_and_type_ref_index_at(index);
580
581 check_property(valid_cp_range(name_and_type_ref_index, length) &&
582 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
583 "Invalid constant pool index %u in class file %s",
584 name_and_type_ref_index, CHECK);
585 // bootstrap specifier index must be checked later,
586 // when BootstrapMethods attr is available
587
588 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
589 cp->set_has_dynamic_constant();
590 break;
591 }
592 case JVM_CONSTANT_InvokeDynamic: {
593 const int name_and_type_ref_index =
594 cp->bootstrap_name_and_type_ref_index_at(index);
595
596 check_property(valid_cp_range(name_and_type_ref_index, length) &&
597 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
598 "Invalid constant pool index %u in class file %s",
599 name_and_type_ref_index, CHECK);
600 // bootstrap specifier index must be checked later,
601 // when BootstrapMethods attr is available
602 break;
603 }
604 default: {
605 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
606 ShouldNotReachHere();
607 break;
608 }
609 } // switch(tag)
610 } // end of for
611
612 _first_patched_klass_resolved_index = num_klasses;
613 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
614
615 if (_cp_patches != NULL) {
616 // need to treat this_class specially...
617
618 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
619 // for now. These will be replaced with actual names of the patched classes in patch_class().
620 Symbol* s = vmSymbols::star_name();
621 for (int n=_orig_cp_size; n<cp->length(); n++) {
622 cp->symbol_at_put(n, s);
623 }
624
625 int this_class_index;
626 {
627 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
628 const u1* const mark = stream->current();
629 stream->skip_u2_fast(1); // skip flags
630 this_class_index = stream->get_u2_fast();
631 stream->set_current(mark); // revert to mark
632 }
633
634 for (index = 1; index < length; index++) { // Index 0 is unused
635 if (has_cp_patch_at(index)) {
636 guarantee_property(index != this_class_index,
637 "Illegal constant pool patch to self at %d in class file %s",
638 index, CHECK);
639 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
640 }
641 }
642 }
643
644 if (!_need_verify) {
645 return;
646 }
647
648 // second verification pass - checks the strings are of the right format.
649 // but not yet to the other entries
650 for (index = 1; index < length; index++) {
651 const jbyte tag = cp->tag_at(index).value();
652 switch (tag) {
653 case JVM_CONSTANT_UnresolvedClass: {
654 const Symbol* const class_name = cp->klass_name_at(index);
655 // check the name, even if _cp_patches will overwrite it
656 verify_legal_class_name(class_name, CHECK);
657 break;
658 }
659 case JVM_CONSTANT_NameAndType: {
660 if (_need_verify) {
661 const int sig_index = cp->signature_ref_index_at(index);
662 const int name_index = cp->name_ref_index_at(index);
663 const Symbol* const name = cp->symbol_at(name_index);
664 const Symbol* const sig = cp->symbol_at(sig_index);
665 guarantee_property(sig->utf8_length() != 0,
666 "Illegal zero length constant pool entry at %d in class %s",
667 sig_index, CHECK);
668 guarantee_property(name->utf8_length() != 0,
669 "Illegal zero length constant pool entry at %d in class %s",
670 name_index, CHECK);
671
672 if (Signature::is_method(sig)) {
673 // Format check method name and signature
674 verify_legal_method_name(name, CHECK);
675 verify_legal_method_signature(name, sig, CHECK);
676 } else {
677 // Format check field name and signature
678 verify_legal_field_name(name, CHECK);
679 verify_legal_field_signature(name, sig, CHECK);
680 }
681 }
682 break;
683 }
684 case JVM_CONSTANT_Dynamic: {
685 const int name_and_type_ref_index =
686 cp->name_and_type_ref_index_at(index);
687 // already verified to be utf8
688 const int name_ref_index =
689 cp->name_ref_index_at(name_and_type_ref_index);
690 // already verified to be utf8
691 const int signature_ref_index =
692 cp->signature_ref_index_at(name_and_type_ref_index);
693 const Symbol* const name = cp->symbol_at(name_ref_index);
694 const Symbol* const signature = cp->symbol_at(signature_ref_index);
695 if (_need_verify) {
696 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
697 // Need only to be sure signature is the right type.
698 if (Signature::is_method(signature)) {
699 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
700 }
701 }
702 break;
703 }
704 case JVM_CONSTANT_InvokeDynamic:
705 case JVM_CONSTANT_Fieldref:
706 case JVM_CONSTANT_Methodref:
707 case JVM_CONSTANT_InterfaceMethodref: {
708 const int name_and_type_ref_index =
709 cp->name_and_type_ref_index_at(index);
710 // already verified to be utf8
711 const int name_ref_index =
712 cp->name_ref_index_at(name_and_type_ref_index);
713 // already verified to be utf8
714 const int signature_ref_index =
715 cp->signature_ref_index_at(name_and_type_ref_index);
716 const Symbol* const name = cp->symbol_at(name_ref_index);
717 const Symbol* const signature = cp->symbol_at(signature_ref_index);
718 if (tag == JVM_CONSTANT_Fieldref) {
719 if (_need_verify) {
720 // Field name and signature are verified above, when iterating NameAndType_info.
721 // Need only to be sure signature is non-zero length and the right type.
722 if (Signature::is_method(signature)) {
723 throwIllegalSignature("Field", name, signature, CHECK);
724 }
725 }
726 } else {
727 if (_need_verify) {
728 // Method name and signature are verified above, when iterating NameAndType_info.
729 // Need only to be sure signature is non-zero length and the right type.
730 if (!Signature::is_method(signature)) {
731 throwIllegalSignature("Method", name, signature, CHECK);
732 }
733 }
734 // 4509014: If a class method name begins with '<', it must be "<init>"
735 const unsigned int name_len = name->utf8_length();
736 if (tag == JVM_CONSTANT_Methodref &&
737 name_len != 0 &&
738 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
739 name != vmSymbols::object_initializer_name()) {
740 classfile_parse_error(
741 "Bad method name at constant pool index %u in class file %s",
742 name_ref_index, CHECK);
743 }
744 }
745 break;
746 }
747 case JVM_CONSTANT_MethodHandle: {
748 const int ref_index = cp->method_handle_index_at(index);
749 const int ref_kind = cp->method_handle_ref_kind_at(index);
750 switch (ref_kind) {
751 case JVM_REF_invokeVirtual:
752 case JVM_REF_invokeStatic:
753 case JVM_REF_invokeSpecial:
754 case JVM_REF_newInvokeSpecial: {
755 const int name_and_type_ref_index =
756 cp->name_and_type_ref_index_at(ref_index);
757 const int name_ref_index =
758 cp->name_ref_index_at(name_and_type_ref_index);
759 const Symbol* const name = cp->symbol_at(name_ref_index);
760 if (ref_kind == JVM_REF_newInvokeSpecial) {
761 if (name != vmSymbols::object_initializer_name()) {
762 classfile_parse_error(
763 "Bad constructor name at constant pool index %u in class file %s",
764 name_ref_index, CHECK);
765 }
766 } else {
767 if (name == vmSymbols::object_initializer_name()) {
768 classfile_parse_error(
769 "Bad method name at constant pool index %u in class file %s",
770 name_ref_index, CHECK);
771 }
772 }
773 break;
774 }
775 // Other ref_kinds are already fully checked in previous pass.
776 } // switch(ref_kind)
777 break;
778 }
779 case JVM_CONSTANT_MethodType: {
780 const Symbol* const no_name = vmSymbols::type_name(); // place holder
781 const Symbol* const signature = cp->method_type_signature_at(index);
782 verify_legal_method_signature(no_name, signature, CHECK);
783 break;
784 }
785 case JVM_CONSTANT_Utf8: {
786 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
787 }
788 } // switch(tag)
789 } // end of for
790 }
791
792 Handle ClassFileParser::clear_cp_patch_at(int index) {
793 Handle patch = cp_patch_at(index);
794 _cp_patches->at_put(index, Handle());
795 assert(!has_cp_patch_at(index), "");
796 return patch;
797 }
798
799 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
800 int name_index = _orig_cp_size + _num_patched_klasses;
801 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
802
803 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
804 _num_patched_klasses ++;
805 }
806
807 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
808 int index,
809 Handle patch,
810 TRAPS) {
811 assert(cp != NULL, "invariant");
812
813 BasicType patch_type = T_VOID;
814
815 switch (cp->tag_at(index).value()) {
816
817 case JVM_CONSTANT_UnresolvedClass: {
818 // Patching a class means pre-resolving it.
819 // The name in the constant pool is ignored.
820 if (java_lang_Class::is_instance(patch())) {
821 guarantee_property(!java_lang_Class::is_primitive(patch()),
822 "Illegal class patch at %d in class file %s",
823 index, CHECK);
824 Klass* k = java_lang_Class::as_Klass(patch());
825 patch_class(cp, index, k, k->name());
826 } else {
827 guarantee_property(java_lang_String::is_instance(patch()),
828 "Illegal class patch at %d in class file %s",
829 index, CHECK);
830 Symbol* const name = java_lang_String::as_symbol(patch());
831 patch_class(cp, index, NULL, name);
832 }
833 break;
834 }
835
836 case JVM_CONSTANT_String: {
837 // skip this patch and don't clear it. Needs the oop array for resolved
838 // references to be created first.
839 return;
840 }
841 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
842 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
843 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
844 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
845 patch_prim:
846 {
847 jvalue value;
848 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
849 guarantee_property(value_type == patch_type,
850 "Illegal primitive patch at %d in class file %s",
851 index, CHECK);
852 switch (value_type) {
853 case T_INT: cp->int_at_put(index, value.i); break;
854 case T_FLOAT: cp->float_at_put(index, value.f); break;
855 case T_LONG: cp->long_at_put(index, value.j); break;
856 case T_DOUBLE: cp->double_at_put(index, value.d); break;
857 default: assert(false, "");
858 }
859 } // end patch_prim label
860 break;
861
862 default: {
863 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
864 guarantee_property(!has_cp_patch_at(index),
865 "Illegal unexpected patch at %d in class file %s",
866 index, CHECK);
867 return;
868 }
869 } // end of switch(tag)
870
871 // On fall-through, mark the patch as used.
872 clear_cp_patch_at(index);
873 }
874 class NameSigHash: public ResourceObj {
875 public:
876 const Symbol* _name; // name
877 const Symbol* _sig; // signature
878 NameSigHash* _next; // Next entry in hash table
879 };
880
881 static const int HASH_ROW_SIZE = 256;
882
883 static unsigned int hash(const Symbol* name, const Symbol* sig) {
884 unsigned int raw_hash = 0;
885 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
886 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
887
888 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
889 }
890
891
892 static void initialize_hashtable(NameSigHash** table) {
893 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
894 }
895 // Return false if the name/sig combination is found in table.
896 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
897 // The old format checker uses heap sort to find duplicates.
898 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
899 // of table since we don't expect Symbol*'s to move.
900 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
901 assert(name != NULL, "name in constant pool is NULL");
902
903 // First lookup for duplicates
904 int index = hash(name, sig);
905 NameSigHash* entry = table[index];
906 while (entry != NULL) {
907 if (entry->_name == name && entry->_sig == sig) {
908 return false;
909 }
910 entry = entry->_next;
911 }
912
913 // No duplicate is found, allocate a new entry and fill it.
914 entry = new NameSigHash();
915 entry->_name = name;
916 entry->_sig = sig;
917
918 // Insert into hash table
919 entry->_next = table[index];
920 table[index] = entry;
921
922 return true;
923 }
924
925 // Side-effects: populates the _local_interfaces field
926 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
927 const int itfs_len,
928 ConstantPool* const cp,
929 bool* const has_nonstatic_concrete_methods,
930 TRAPS) {
931 assert(stream != NULL, "invariant");
932 assert(cp != NULL, "invariant");
933 assert(has_nonstatic_concrete_methods != NULL, "invariant");
934
935 if (itfs_len == 0) {
936 _local_interfaces = Universe::the_empty_instance_klass_array();
937 } else {
938 assert(itfs_len > 0, "only called for len>0");
939 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
940
941 int index;
942 for (index = 0; index < itfs_len; index++) {
943 const u2 interface_index = stream->get_u2(CHECK);
944 Klass* interf;
945 check_property(
946 valid_klass_reference_at(interface_index),
947 "Interface name has bad constant pool index %u in class file %s",
948 interface_index, CHECK);
949 if (cp->tag_at(interface_index).is_klass()) {
950 interf = cp->resolved_klass_at(interface_index);
951 } else {
952 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
953
954 // Don't need to check legal name because it's checked when parsing constant pool.
955 // But need to make sure it's not an array type.
956 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
957 "Bad interface name in class file %s", CHECK);
958
959 // Call resolve_super so classcircularity is checked
960 interf = SystemDictionary::resolve_super_or_fail(
961 _class_name,
962 unresolved_klass,
963 Handle(THREAD, _loader_data->class_loader()),
964 _protection_domain,
965 false,
966 CHECK);
967 }
968
969 if (!interf->is_interface()) {
970 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
971 err_msg("class %s can not implement %s, because it is not an interface (%s)",
972 _class_name->as_klass_external_name(),
973 interf->external_name(),
974 interf->class_in_module_of_loader()));
975 }
976
977 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
978 *has_nonstatic_concrete_methods = true;
979 }
980 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
981 }
982
983 if (!_need_verify || itfs_len <= 1) {
984 return;
985 }
986
987 // Check if there's any duplicates in interfaces
988 ResourceMark rm(THREAD);
989 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
990 NameSigHash*,
991 HASH_ROW_SIZE);
992 initialize_hashtable(interface_names);
993 bool dup = false;
994 const Symbol* name = NULL;
995 {
996 debug_only(NoSafepointVerifier nsv;)
997 for (index = 0; index < itfs_len; index++) {
998 const InstanceKlass* const k = _local_interfaces->at(index);
999 name = k->name();
1000 // If no duplicates, add (name, NULL) in hashtable interface_names.
1001 if (!put_after_lookup(name, NULL, interface_names)) {
1002 dup = true;
1003 break;
1004 }
1005 }
1006 }
1007 if (dup) {
1008 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
1009 name->as_C_string(), CHECK);
1010 }
1011 }
1012 }
1013
1014 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
1015 int constantvalue_index,
1016 int signature_index,
1017 TRAPS) const {
1018 // Make sure the constant pool entry is of a type appropriate to this field
1019 guarantee_property(
1020 (constantvalue_index > 0 &&
1021 constantvalue_index < cp->length()),
1022 "Bad initial value index %u in ConstantValue attribute in class file %s",
1023 constantvalue_index, CHECK);
1024
1025 const constantTag value_type = cp->tag_at(constantvalue_index);
1026 switch(cp->basic_type_for_signature_at(signature_index)) {
1027 case T_LONG: {
1028 guarantee_property(value_type.is_long(),
1029 "Inconsistent constant value type in class file %s",
1030 CHECK);
1031 break;
1032 }
1033 case T_FLOAT: {
1034 guarantee_property(value_type.is_float(),
1035 "Inconsistent constant value type in class file %s",
1036 CHECK);
1037 break;
1038 }
1039 case T_DOUBLE: {
1040 guarantee_property(value_type.is_double(),
1041 "Inconsistent constant value type in class file %s",
1042 CHECK);
1043 break;
1044 }
1045 case T_BYTE:
1046 case T_CHAR:
1047 case T_SHORT:
1048 case T_BOOLEAN:
1049 case T_INT: {
1050 guarantee_property(value_type.is_int(),
1051 "Inconsistent constant value type in class file %s",
1052 CHECK);
1053 break;
1054 }
1055 case T_OBJECT: {
1056 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1057 && value_type.is_string()),
1058 "Bad string initial value in class file %s",
1059 CHECK);
1060 break;
1061 }
1062 default: {
1063 classfile_parse_error("Unable to set initial value %u in class file %s",
1064 constantvalue_index,
1065 CHECK);
1066 }
1067 }
1068 }
1069
1070 class AnnotationCollector : public ResourceObj{
1071 public:
1072 enum Location { _in_field, _in_method, _in_class };
1073 enum ID {
1074 _unknown = 0,
1075 _method_CallerSensitive,
1076 _method_ForceInline,
1077 _method_DontInline,
1078 _method_InjectedProfile,
1079 _method_LambdaForm_Compiled,
1080 _method_Hidden,
1081 _method_HotSpotIntrinsicCandidate,
1082 _jdk_internal_vm_annotation_Contended,
1083 _field_Stable,
1084 _jdk_internal_vm_annotation_ReservedStackAccess,
1085 _annotation_LIMIT
1086 };
1087 const Location _location;
1088 int _annotations_present;
1089 u2 _contended_group;
1090
1091 AnnotationCollector(Location location)
1092 : _location(location), _annotations_present(0)
1093 {
1094 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1095 }
1096 // If this annotation name has an ID, report it (or _none).
1097 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
1098 // Set the annotation name:
1099 void set_annotation(ID id) {
1100 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1101 _annotations_present |= nth_bit((int)id);
1102 }
1103
1104 void remove_annotation(ID id) {
1105 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1106 _annotations_present &= ~nth_bit((int)id);
1107 }
1108
1109 // Report if the annotation is present.
1110 bool has_any_annotations() const { return _annotations_present != 0; }
1111 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1112
1113 void set_contended_group(u2 group) { _contended_group = group; }
1114 u2 contended_group() const { return _contended_group; }
1115
1116 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1117
1118 void set_stable(bool stable) { set_annotation(_field_Stable); }
1119 bool is_stable() const { return has_annotation(_field_Stable); }
1120 };
1121
1122 // This class also doubles as a holder for metadata cleanup.
1123 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1124 private:
1125 ClassLoaderData* _loader_data;
1126 AnnotationArray* _field_annotations;
1127 AnnotationArray* _field_type_annotations;
1128 public:
1129 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1130 AnnotationCollector(_in_field),
1131 _loader_data(loader_data),
1132 _field_annotations(NULL),
1133 _field_type_annotations(NULL) {}
1134 ~FieldAnnotationCollector();
1135 void apply_to(FieldInfo* f);
1136 AnnotationArray* field_annotations() { return _field_annotations; }
1137 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1138
1139 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1140 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1141 };
1142
1143 class MethodAnnotationCollector : public AnnotationCollector{
1144 public:
1145 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1146 void apply_to(const methodHandle& m);
1147 };
1148
1149 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1150 public:
1151 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1152 void apply_to(InstanceKlass* ik);
1153 };
1154
1155
1156 static int skip_annotation_value(const u1*, int, int); // fwd decl
1157
1158 // Safely increment index by val if does not pass limit
1159 #define SAFE_ADD(index, limit, val) \
1160 if (index >= limit - val) return limit; \
1161 index += val;
1162
1163 // Skip an annotation. Return >=limit if there is any problem.
1164 static int skip_annotation(const u1* buffer, int limit, int index) {
1165 assert(buffer != NULL, "invariant");
1166 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1167 // value := switch (tag:u1) { ... }
1168 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1169 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1170 while (--nmem >= 0 && index < limit) {
1171 SAFE_ADD(index, limit, 2); // skip member
1172 index = skip_annotation_value(buffer, limit, index);
1173 }
1174 return index;
1175 }
1176
1177 // Skip an annotation value. Return >=limit if there is any problem.
1178 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1179 assert(buffer != NULL, "invariant");
1180
1181 // value := switch (tag:u1) {
1182 // case B, C, I, S, Z, D, F, J, c: con:u2;
1183 // case e: e_class:u2 e_name:u2;
1184 // case s: s_con:u2;
1185 // case [: do(nval:u2) {value};
1186 // case @: annotation;
1187 // case s: s_con:u2;
1188 // }
1189 SAFE_ADD(index, limit, 1); // read tag
1190 const u1 tag = buffer[index - 1];
1191 switch (tag) {
1192 case 'B':
1193 case 'C':
1194 case 'I':
1195 case 'S':
1196 case 'Z':
1197 case 'D':
1198 case 'F':
1199 case 'J':
1200 case 'c':
1201 case 's':
1202 SAFE_ADD(index, limit, 2); // skip con or s_con
1203 break;
1204 case 'e':
1205 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1206 break;
1207 case '[':
1208 {
1209 SAFE_ADD(index, limit, 2); // read nval
1210 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1211 while (--nval >= 0 && index < limit) {
1212 index = skip_annotation_value(buffer, limit, index);
1213 }
1214 }
1215 break;
1216 case '@':
1217 index = skip_annotation(buffer, limit, index);
1218 break;
1219 default:
1220 return limit; // bad tag byte
1221 }
1222 return index;
1223 }
1224
1225 // Sift through annotations, looking for those significant to the VM:
1226 static void parse_annotations(const ConstantPool* const cp,
1227 const u1* buffer, int limit,
1228 AnnotationCollector* coll,
1229 ClassLoaderData* loader_data,
1230 const bool can_access_vm_annotations,
1231 TRAPS) {
1232
1233 assert(cp != NULL, "invariant");
1234 assert(buffer != NULL, "invariant");
1235 assert(coll != NULL, "invariant");
1236 assert(loader_data != NULL, "invariant");
1237
1238 // annotations := do(nann:u2) {annotation}
1239 int index = 2; // read nann
1240 if (index >= limit) return;
1241 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1242 enum { // initial annotation layout
1243 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1244 count_off = 2, // u2 such as 1 (one value)
1245 member_off = 4, // utf8 such as 'value'
1246 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1247 e_tag_val = 'e',
1248 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1249 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1250 e_size = 11, // end of 'e' annotation
1251 c_tag_val = 'c', // payload is type
1252 c_con_off = 7, // utf8 payload, such as 'I'
1253 c_size = 9, // end of 'c' annotation
1254 s_tag_val = 's', // payload is String
1255 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1256 s_size = 9,
1257 min_size = 6 // smallest possible size (zero members)
1258 };
1259 // Cannot add min_size to index in case of overflow MAX_INT
1260 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1261 int index0 = index;
1262 index = skip_annotation(buffer, limit, index);
1263 const u1* const abase = buffer + index0;
1264 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1265 const int count = Bytes::get_Java_u2((address)abase + count_off);
1266 const Symbol* const aname = check_symbol_at(cp, atype);
1267 if (aname == NULL) break; // invalid annotation name
1268 const Symbol* member = NULL;
1269 if (count >= 1) {
1270 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1271 member = check_symbol_at(cp, member_index);
1272 if (member == NULL) break; // invalid member name
1273 }
1274
1275 // Here is where parsing particular annotations will take place.
1276 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1277 if (AnnotationCollector::_unknown == id) continue;
1278 coll->set_annotation(id);
1279
1280 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1281 // @Contended can optionally specify the contention group.
1282 //
1283 // Contended group defines the equivalence class over the fields:
1284 // the fields within the same contended group are not treated distinct.
1285 // The only exception is default group, which does not incur the
1286 // equivalence. Naturally, contention group for classes is meaningless.
1287 //
1288 // While the contention group is specified as String, annotation
1289 // values are already interned, and we might as well use the constant
1290 // pool index as the group tag.
1291 //
1292 u2 group_index = 0; // default contended group
1293 if (count == 1
1294 && s_size == (index - index0) // match size
1295 && s_tag_val == *(abase + tag_off)
1296 && member == vmSymbols::value_name()) {
1297 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1298 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1299 group_index = 0; // default contended group
1300 }
1301 }
1302 coll->set_contended_group(group_index);
1303 }
1304 }
1305 }
1306
1307
1308 // Parse attributes for a field.
1309 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1310 u2 attributes_count,
1311 bool is_static, u2 signature_index,
1312 u2* const constantvalue_index_addr,
1313 bool* const is_synthetic_addr,
1314 u2* const generic_signature_index_addr,
1315 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1316 TRAPS) {
1317 assert(cfs != NULL, "invariant");
1318 assert(constantvalue_index_addr != NULL, "invariant");
1319 assert(is_synthetic_addr != NULL, "invariant");
1320 assert(generic_signature_index_addr != NULL, "invariant");
1321 assert(parsed_annotations != NULL, "invariant");
1322 assert(attributes_count > 0, "attributes_count should be greater than 0");
1323
1324 u2 constantvalue_index = 0;
1325 u2 generic_signature_index = 0;
1326 bool is_synthetic = false;
1327 const u1* runtime_visible_annotations = NULL;
1328 int runtime_visible_annotations_length = 0;
1329 const u1* runtime_invisible_annotations = NULL;
1330 int runtime_invisible_annotations_length = 0;
1331 const u1* runtime_visible_type_annotations = NULL;
1332 int runtime_visible_type_annotations_length = 0;
1333 const u1* runtime_invisible_type_annotations = NULL;
1334 int runtime_invisible_type_annotations_length = 0;
1335 bool runtime_invisible_annotations_exists = false;
1336 bool runtime_invisible_type_annotations_exists = false;
1337 const ConstantPool* const cp = _cp;
1338
1339 while (attributes_count--) {
1340 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1341 const u2 attribute_name_index = cfs->get_u2_fast();
1342 const u4 attribute_length = cfs->get_u4_fast();
1343 check_property(valid_symbol_at(attribute_name_index),
1344 "Invalid field attribute index %u in class file %s",
1345 attribute_name_index,
1346 CHECK);
1347
1348 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1349 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1350 // ignore if non-static
1351 if (constantvalue_index != 0) {
1352 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1353 }
1354 check_property(
1355 attribute_length == 2,
1356 "Invalid ConstantValue field attribute length %u in class file %s",
1357 attribute_length, CHECK);
1358
1359 constantvalue_index = cfs->get_u2(CHECK);
1360 if (_need_verify) {
1361 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1362 }
1363 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1364 if (attribute_length != 0) {
1365 classfile_parse_error(
1366 "Invalid Synthetic field attribute length %u in class file %s",
1367 attribute_length, CHECK);
1368 }
1369 is_synthetic = true;
1370 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1371 if (attribute_length != 0) {
1372 classfile_parse_error(
1373 "Invalid Deprecated field attribute length %u in class file %s",
1374 attribute_length, CHECK);
1375 }
1376 } else if (_major_version >= JAVA_1_5_VERSION) {
1377 if (attribute_name == vmSymbols::tag_signature()) {
1378 if (generic_signature_index != 0) {
1379 classfile_parse_error(
1380 "Multiple Signature attributes for field in class file %s", CHECK);
1381 }
1382 if (attribute_length != 2) {
1383 classfile_parse_error(
1384 "Wrong size %u for field's Signature attribute in class file %s",
1385 attribute_length, CHECK);
1386 }
1387 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1388 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1389 if (runtime_visible_annotations != NULL) {
1390 classfile_parse_error(
1391 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1392 }
1393 runtime_visible_annotations_length = attribute_length;
1394 runtime_visible_annotations = cfs->current();
1395 assert(runtime_visible_annotations != NULL, "null visible annotations");
1396 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1397 parse_annotations(cp,
1398 runtime_visible_annotations,
1399 runtime_visible_annotations_length,
1400 parsed_annotations,
1401 _loader_data,
1402 _can_access_vm_annotations,
1403 CHECK);
1404 cfs->skip_u1_fast(runtime_visible_annotations_length);
1405 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1406 if (runtime_invisible_annotations_exists) {
1407 classfile_parse_error(
1408 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1409 }
1410 runtime_invisible_annotations_exists = true;
1411 if (PreserveAllAnnotations) {
1412 runtime_invisible_annotations_length = attribute_length;
1413 runtime_invisible_annotations = cfs->current();
1414 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1415 }
1416 cfs->skip_u1(attribute_length, CHECK);
1417 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1418 if (runtime_visible_type_annotations != NULL) {
1419 classfile_parse_error(
1420 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1421 }
1422 runtime_visible_type_annotations_length = attribute_length;
1423 runtime_visible_type_annotations = cfs->current();
1424 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1425 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1426 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1427 if (runtime_invisible_type_annotations_exists) {
1428 classfile_parse_error(
1429 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1430 } else {
1431 runtime_invisible_type_annotations_exists = true;
1432 }
1433 if (PreserveAllAnnotations) {
1434 runtime_invisible_type_annotations_length = attribute_length;
1435 runtime_invisible_type_annotations = cfs->current();
1436 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1437 }
1438 cfs->skip_u1(attribute_length, CHECK);
1439 } else {
1440 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1441 }
1442 } else {
1443 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1444 }
1445 }
1446
1447 *constantvalue_index_addr = constantvalue_index;
1448 *is_synthetic_addr = is_synthetic;
1449 *generic_signature_index_addr = generic_signature_index;
1450 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1451 runtime_visible_annotations_length,
1452 runtime_invisible_annotations,
1453 runtime_invisible_annotations_length,
1454 CHECK);
1455 parsed_annotations->set_field_annotations(a);
1456 a = assemble_annotations(runtime_visible_type_annotations,
1457 runtime_visible_type_annotations_length,
1458 runtime_invisible_type_annotations,
1459 runtime_invisible_type_annotations_length,
1460 CHECK);
1461 parsed_annotations->set_field_type_annotations(a);
1462 return;
1463 }
1464
1465
1466 // Field allocation types. Used for computing field offsets.
1467
1468 enum FieldAllocationType {
1469 STATIC_OOP, // Oops
1470 STATIC_BYTE, // Boolean, Byte, char
1471 STATIC_SHORT, // shorts
1472 STATIC_WORD, // ints
1473 STATIC_DOUBLE, // aligned long or double
1474 NONSTATIC_OOP,
1475 NONSTATIC_BYTE,
1476 NONSTATIC_SHORT,
1477 NONSTATIC_WORD,
1478 NONSTATIC_DOUBLE,
1479 MAX_FIELD_ALLOCATION_TYPE,
1480 BAD_ALLOCATION_TYPE = -1
1481 };
1482
1483 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1484 BAD_ALLOCATION_TYPE, // 0
1485 BAD_ALLOCATION_TYPE, // 1
1486 BAD_ALLOCATION_TYPE, // 2
1487 BAD_ALLOCATION_TYPE, // 3
1488 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1489 NONSTATIC_SHORT, // T_CHAR = 5,
1490 NONSTATIC_WORD, // T_FLOAT = 6,
1491 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1492 NONSTATIC_BYTE, // T_BYTE = 8,
1493 NONSTATIC_SHORT, // T_SHORT = 9,
1494 NONSTATIC_WORD, // T_INT = 10,
1495 NONSTATIC_DOUBLE, // T_LONG = 11,
1496 NONSTATIC_OOP, // T_OBJECT = 12,
1497 NONSTATIC_OOP, // T_ARRAY = 13,
1498 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1499 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1500 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1501 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1502 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1503 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1504 BAD_ALLOCATION_TYPE, // 0
1505 BAD_ALLOCATION_TYPE, // 1
1506 BAD_ALLOCATION_TYPE, // 2
1507 BAD_ALLOCATION_TYPE, // 3
1508 STATIC_BYTE , // T_BOOLEAN = 4,
1509 STATIC_SHORT, // T_CHAR = 5,
1510 STATIC_WORD, // T_FLOAT = 6,
1511 STATIC_DOUBLE, // T_DOUBLE = 7,
1512 STATIC_BYTE, // T_BYTE = 8,
1513 STATIC_SHORT, // T_SHORT = 9,
1514 STATIC_WORD, // T_INT = 10,
1515 STATIC_DOUBLE, // T_LONG = 11,
1516 STATIC_OOP, // T_OBJECT = 12,
1517 STATIC_OOP, // T_ARRAY = 13,
1518 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1519 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1520 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1521 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1522 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1523 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1524 };
1525
1526 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1527 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1528 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1529 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1530 return result;
1531 }
1532
1533 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1534 public:
1535 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1536
1537 FieldAllocationCount() {
1538 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1539 count[i] = 0;
1540 }
1541 }
1542
1543 FieldAllocationType update(bool is_static, BasicType type) {
1544 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1545 if (atype != BAD_ALLOCATION_TYPE) {
1546 // Make sure there is no overflow with injected fields.
1547 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1548 count[atype]++;
1549 }
1550 return atype;
1551 }
1552 };
1553
1554 // Side-effects: populates the _fields, _fields_annotations,
1555 // _fields_type_annotations fields
1556 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1557 bool is_interface,
1558 FieldAllocationCount* const fac,
1559 ConstantPool* cp,
1560 const int cp_size,
1561 u2* const java_fields_count_ptr,
1562 TRAPS) {
1563
1564 assert(cfs != NULL, "invariant");
1565 assert(fac != NULL, "invariant");
1566 assert(cp != NULL, "invariant");
1567 assert(java_fields_count_ptr != NULL, "invariant");
1568
1569 assert(NULL == _fields, "invariant");
1570 assert(NULL == _fields_annotations, "invariant");
1571 assert(NULL == _fields_type_annotations, "invariant");
1572
1573 cfs->guarantee_more(2, CHECK); // length
1574 const u2 length = cfs->get_u2_fast();
1575 *java_fields_count_ptr = length;
1576
1577 int num_injected = 0;
1578 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1579 &num_injected);
1580 const int total_fields = length + num_injected;
1581
1582 // The field array starts with tuples of shorts
1583 // [access, name index, sig index, initial value index, byte offset].
1584 // A generic signature slot only exists for field with generic
1585 // signature attribute. And the access flag is set with
1586 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1587 // signature slots are at the end of the field array and after all
1588 // other fields data.
1589 //
1590 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1591 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1592 // ...
1593 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1594 // [generic signature index]
1595 // [generic signature index]
1596 // ...
1597 //
1598 // Allocate a temporary resource array for field data. For each field,
1599 // a slot is reserved in the temporary array for the generic signature
1600 // index. After parsing all fields, the data are copied to a permanent
1601 // array and any unused slots will be discarded.
1602 ResourceMark rm(THREAD);
1603 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1604 u2,
1605 total_fields * (FieldInfo::field_slots + 1));
1606
1607 // The generic signature slots start after all other fields' data.
1608 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1609 int num_generic_signature = 0;
1610 for (int n = 0; n < length; n++) {
1611 // access_flags, name_index, descriptor_index, attributes_count
1612 cfs->guarantee_more(8, CHECK);
1613
1614 AccessFlags access_flags;
1615 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1616 verify_legal_field_modifiers(flags, is_interface, CHECK);
1617 access_flags.set_flags(flags);
1618
1619 const u2 name_index = cfs->get_u2_fast();
1620 check_property(valid_symbol_at(name_index),
1621 "Invalid constant pool index %u for field name in class file %s",
1622 name_index, CHECK);
1623 const Symbol* const name = cp->symbol_at(name_index);
1624 verify_legal_field_name(name, CHECK);
1625
1626 const u2 signature_index = cfs->get_u2_fast();
1627 check_property(valid_symbol_at(signature_index),
1628 "Invalid constant pool index %u for field signature in class file %s",
1629 signature_index, CHECK);
1630 const Symbol* const sig = cp->symbol_at(signature_index);
1631 verify_legal_field_signature(name, sig, CHECK);
1632
1633 u2 constantvalue_index = 0;
1634 bool is_synthetic = false;
1635 u2 generic_signature_index = 0;
1636 const bool is_static = access_flags.is_static();
1637 FieldAnnotationCollector parsed_annotations(_loader_data);
1638
1639 const u2 attributes_count = cfs->get_u2_fast();
1640 if (attributes_count > 0) {
1641 parse_field_attributes(cfs,
1642 attributes_count,
1643 is_static,
1644 signature_index,
1645 &constantvalue_index,
1646 &is_synthetic,
1647 &generic_signature_index,
1648 &parsed_annotations,
1649 CHECK);
1650
1651 if (parsed_annotations.field_annotations() != NULL) {
1652 if (_fields_annotations == NULL) {
1653 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1654 _loader_data, length, NULL,
1655 CHECK);
1656 }
1657 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1658 parsed_annotations.set_field_annotations(NULL);
1659 }
1660 if (parsed_annotations.field_type_annotations() != NULL) {
1661 if (_fields_type_annotations == NULL) {
1662 _fields_type_annotations =
1663 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1664 length,
1665 NULL,
1666 CHECK);
1667 }
1668 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1669 parsed_annotations.set_field_type_annotations(NULL);
1670 }
1671
1672 if (is_synthetic) {
1673 access_flags.set_is_synthetic();
1674 }
1675 if (generic_signature_index != 0) {
1676 access_flags.set_field_has_generic_signature();
1677 fa[generic_signature_slot] = generic_signature_index;
1678 generic_signature_slot ++;
1679 num_generic_signature ++;
1680 }
1681 }
1682
1683 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1684 field->initialize(access_flags.as_short(),
1685 name_index,
1686 signature_index,
1687 constantvalue_index);
1688 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1689
1690 // Remember how many oops we encountered and compute allocation type
1691 const FieldAllocationType atype = fac->update(is_static, type);
1692 field->set_allocation_type(atype);
1693
1694 // After field is initialized with type, we can augment it with aux info
1695 if (parsed_annotations.has_any_annotations()) {
1696 parsed_annotations.apply_to(field);
1697 if (field->is_contended()) {
1698 _has_contended_fields = true;
1699 }
1700 }
1701 }
1702
1703 int index = length;
1704 if (num_injected != 0) {
1705 for (int n = 0; n < num_injected; n++) {
1706 // Check for duplicates
1707 if (injected[n].may_be_java) {
1708 const Symbol* const name = injected[n].name();
1709 const Symbol* const signature = injected[n].signature();
1710 bool duplicate = false;
1711 for (int i = 0; i < length; i++) {
1712 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1713 if (name == cp->symbol_at(f->name_index()) &&
1714 signature == cp->symbol_at(f->signature_index())) {
1715 // Symbol is desclared in Java so skip this one
1716 duplicate = true;
1717 break;
1718 }
1719 }
1720 if (duplicate) {
1721 // These will be removed from the field array at the end
1722 continue;
1723 }
1724 }
1725
1726 // Injected field
1727 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1728 field->initialize(JVM_ACC_FIELD_INTERNAL,
1729 injected[n].name_index,
1730 injected[n].signature_index,
1731 0);
1732
1733 const BasicType type = Signature::basic_type(injected[n].signature());
1734
1735 // Remember how many oops we encountered and compute allocation type
1736 const FieldAllocationType atype = fac->update(false, type);
1737 field->set_allocation_type(atype);
1738 index++;
1739 }
1740 }
1741
1742 assert(NULL == _fields, "invariant");
1743
1744 _fields =
1745 MetadataFactory::new_array<u2>(_loader_data,
1746 index * FieldInfo::field_slots + num_generic_signature,
1747 CHECK);
1748 // Sometimes injected fields already exist in the Java source so
1749 // the fields array could be too long. In that case the
1750 // fields array is trimed. Also unused slots that were reserved
1751 // for generic signature indexes are discarded.
1752 {
1753 int i = 0;
1754 for (; i < index * FieldInfo::field_slots; i++) {
1755 _fields->at_put(i, fa[i]);
1756 }
1757 for (int j = total_fields * FieldInfo::field_slots;
1758 j < generic_signature_slot; j++) {
1759 _fields->at_put(i++, fa[j]);
1760 }
1761 assert(_fields->length() == i, "");
1762 }
1763
1764 if (_need_verify && length > 1) {
1765 // Check duplicated fields
1766 ResourceMark rm(THREAD);
1767 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1768 THREAD, NameSigHash*, HASH_ROW_SIZE);
1769 initialize_hashtable(names_and_sigs);
1770 bool dup = false;
1771 const Symbol* name = NULL;
1772 const Symbol* sig = NULL;
1773 {
1774 debug_only(NoSafepointVerifier nsv;)
1775 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1776 name = fs.name();
1777 sig = fs.signature();
1778 // If no duplicates, add name/signature in hashtable names_and_sigs.
1779 if (!put_after_lookup(name, sig, names_and_sigs)) {
1780 dup = true;
1781 break;
1782 }
1783 }
1784 }
1785 if (dup) {
1786 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1787 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1788 }
1789 }
1790 }
1791
1792
1793 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1794 u4 code_length,
1795 u4 exception_table_length,
1796 TRAPS) {
1797 assert(cfs != NULL, "invariant");
1798
1799 const unsafe_u2* const exception_table_start = cfs->current();
1800 assert(exception_table_start != NULL, "null exception table");
1801
1802 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1803 // end_pc,
1804 // handler_pc,
1805 // catch_type_index
1806
1807 // Will check legal target after parsing code array in verifier.
1808 if (_need_verify) {
1809 for (unsigned int i = 0; i < exception_table_length; i++) {
1810 const u2 start_pc = cfs->get_u2_fast();
1811 const u2 end_pc = cfs->get_u2_fast();
1812 const u2 handler_pc = cfs->get_u2_fast();
1813 const u2 catch_type_index = cfs->get_u2_fast();
1814 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1815 "Illegal exception table range in class file %s",
1816 CHECK_NULL);
1817 guarantee_property(handler_pc < code_length,
1818 "Illegal exception table handler in class file %s",
1819 CHECK_NULL);
1820 if (catch_type_index != 0) {
1821 guarantee_property(valid_klass_reference_at(catch_type_index),
1822 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1823 }
1824 }
1825 } else {
1826 cfs->skip_u2_fast(exception_table_length * 4);
1827 }
1828 return exception_table_start;
1829 }
1830
1831 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1832 u4 code_length,
1833 CompressedLineNumberWriteStream**const write_stream,
1834 TRAPS) {
1835
1836 const ClassFileStream* const cfs = _stream;
1837 unsigned int num_entries = cfs->get_u2(CHECK);
1838
1839 // Each entry is a u2 start_pc, and a u2 line_number
1840 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1841
1842 // Verify line number attribute and table length
1843 check_property(
1844 code_attribute_length == sizeof(u2) + length_in_bytes,
1845 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1846
1847 cfs->guarantee_more(length_in_bytes, CHECK);
1848
1849 if ((*write_stream) == NULL) {
1850 if (length_in_bytes > fixed_buffer_size) {
1851 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1852 } else {
1853 (*write_stream) = new CompressedLineNumberWriteStream(
1854 _linenumbertable_buffer, fixed_buffer_size);
1855 }
1856 }
1857
1858 while (num_entries-- > 0) {
1859 const u2 bci = cfs->get_u2_fast(); // start_pc
1860 const u2 line = cfs->get_u2_fast(); // line_number
1861 guarantee_property(bci < code_length,
1862 "Invalid pc in LineNumberTable in class file %s", CHECK);
1863 (*write_stream)->write_pair(bci, line);
1864 }
1865 }
1866
1867
1868 class LVT_Hash : public AllStatic {
1869 public:
1870
1871 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1872 /*
1873 * 3-tuple start_bci/length/slot has to be unique key,
1874 * so the following comparison seems to be redundant:
1875 * && elem->name_cp_index == entry->_elem->name_cp_index
1876 */
1877 return (e0.start_bci == e1.start_bci &&
1878 e0.length == e1.length &&
1879 e0.name_cp_index == e1.name_cp_index &&
1880 e0.slot == e1.slot);
1881 }
1882
1883 static unsigned int hash(LocalVariableTableElement const& e0) {
1884 unsigned int raw_hash = e0.start_bci;
1885
1886 raw_hash = e0.length + raw_hash * 37;
1887 raw_hash = e0.name_cp_index + raw_hash * 37;
1888 raw_hash = e0.slot + raw_hash * 37;
1889
1890 return raw_hash;
1891 }
1892 };
1893
1894
1895 // Class file LocalVariableTable elements.
1896 class Classfile_LVT_Element {
1897 public:
1898 u2 start_bci;
1899 u2 length;
1900 u2 name_cp_index;
1901 u2 descriptor_cp_index;
1902 u2 slot;
1903 };
1904
1905 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1906 LocalVariableTableElement* const lvt) {
1907 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1908 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1909 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1910 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1911 lvt->signature_cp_index = 0;
1912 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1913 }
1914
1915 // Function is used to parse both attributes:
1916 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1917 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1918 u4 code_length,
1919 u2 max_locals,
1920 u4 code_attribute_length,
1921 u2* const localvariable_table_length,
1922 bool isLVTT,
1923 TRAPS) {
1924 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1925 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1926 const unsigned int size =
1927 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1928
1929 const ConstantPool* const cp = _cp;
1930
1931 // Verify local variable table attribute has right length
1932 if (_need_verify) {
1933 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1934 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1935 }
1936
1937 const unsafe_u2* const localvariable_table_start = cfs->current();
1938 assert(localvariable_table_start != NULL, "null local variable table");
1939 if (!_need_verify) {
1940 cfs->skip_u2_fast(size);
1941 } else {
1942 cfs->guarantee_more(size * 2, CHECK_NULL);
1943 for(int i = 0; i < (*localvariable_table_length); i++) {
1944 const u2 start_pc = cfs->get_u2_fast();
1945 const u2 length = cfs->get_u2_fast();
1946 const u2 name_index = cfs->get_u2_fast();
1947 const u2 descriptor_index = cfs->get_u2_fast();
1948 const u2 index = cfs->get_u2_fast();
1949 // Assign to a u4 to avoid overflow
1950 const u4 end_pc = (u4)start_pc + (u4)length;
1951
1952 if (start_pc >= code_length) {
1953 classfile_parse_error(
1954 "Invalid start_pc %u in %s in class file %s",
1955 start_pc, tbl_name, CHECK_NULL);
1956 }
1957 if (end_pc > code_length) {
1958 classfile_parse_error(
1959 "Invalid length %u in %s in class file %s",
1960 length, tbl_name, CHECK_NULL);
1961 }
1962 const int cp_size = cp->length();
1963 guarantee_property(valid_symbol_at(name_index),
1964 "Name index %u in %s has bad constant type in class file %s",
1965 name_index, tbl_name, CHECK_NULL);
1966 guarantee_property(valid_symbol_at(descriptor_index),
1967 "Signature index %u in %s has bad constant type in class file %s",
1968 descriptor_index, tbl_name, CHECK_NULL);
1969
1970 const Symbol* const name = cp->symbol_at(name_index);
1971 const Symbol* const sig = cp->symbol_at(descriptor_index);
1972 verify_legal_field_name(name, CHECK_NULL);
1973 u2 extra_slot = 0;
1974 if (!isLVTT) {
1975 verify_legal_field_signature(name, sig, CHECK_NULL);
1976
1977 // 4894874: check special cases for double and long local variables
1978 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1979 sig == vmSymbols::type_signature(T_LONG)) {
1980 extra_slot = 1;
1981 }
1982 }
1983 guarantee_property((index + extra_slot) < max_locals,
1984 "Invalid index %u in %s in class file %s",
1985 index, tbl_name, CHECK_NULL);
1986 }
1987 }
1988 return localvariable_table_start;
1989 }
1990
1991 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1992 u4 code_attribute_length,
1993 bool need_verify,
1994 TRAPS) {
1995 assert(cfs != NULL, "invariant");
1996
1997 if (0 == code_attribute_length) {
1998 return NULL;
1999 }
2000
2001 const u1* const stackmap_table_start = cfs->current();
2002 assert(stackmap_table_start != NULL, "null stackmap table");
2003
2004 // check code_attribute_length first
2005 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2006
2007 if (!need_verify && !DumpSharedSpaces) {
2008 return NULL;
2009 }
2010 return stackmap_table_start;
2011 }
2012
2013 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2014 u2* const checked_exceptions_length,
2015 u4 method_attribute_length,
2016 TRAPS) {
2017 assert(cfs != NULL, "invariant");
2018 assert(checked_exceptions_length != NULL, "invariant");
2019
2020 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2021 *checked_exceptions_length = cfs->get_u2_fast();
2022 const unsigned int size =
2023 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2024 const unsafe_u2* const checked_exceptions_start = cfs->current();
2025 assert(checked_exceptions_start != NULL, "null checked exceptions");
2026 if (!_need_verify) {
2027 cfs->skip_u2_fast(size);
2028 } else {
2029 // Verify each value in the checked exception table
2030 u2 checked_exception;
2031 const u2 len = *checked_exceptions_length;
2032 cfs->guarantee_more(2 * len, CHECK_NULL);
2033 for (int i = 0; i < len; i++) {
2034 checked_exception = cfs->get_u2_fast();
2035 check_property(
2036 valid_klass_reference_at(checked_exception),
2037 "Exception name has bad type at constant pool %u in class file %s",
2038 checked_exception, CHECK_NULL);
2039 }
2040 }
2041 // check exceptions attribute length
2042 if (_need_verify) {
2043 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2044 sizeof(u2) * size),
2045 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2046 }
2047 return checked_exceptions_start;
2048 }
2049
2050 void ClassFileParser::throwIllegalSignature(const char* type,
2051 const Symbol* name,
2052 const Symbol* sig,
2053 TRAPS) const {
2054 assert(name != NULL, "invariant");
2055 assert(sig != NULL, "invariant");
2056
2057 ResourceMark rm(THREAD);
2058 Exceptions::fthrow(THREAD_AND_LOCATION,
2059 vmSymbols::java_lang_ClassFormatError(),
2060 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2061 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2062 }
2063
2064 AnnotationCollector::ID
2065 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2066 const Symbol* name,
2067 const bool can_access_vm_annotations) {
2068 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2069 // Privileged code can use all annotations. Other code silently drops some.
2070 const bool privileged = loader_data->is_boot_class_loader_data() ||
2071 loader_data->is_platform_class_loader_data() ||
2072 can_access_vm_annotations;
2073 switch (sid) {
2074 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2075 if (_location != _in_method) break; // only allow for methods
2076 if (!privileged) break; // only allow in privileged code
2077 return _method_CallerSensitive;
2078 }
2079 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2080 if (_location != _in_method) break; // only allow for methods
2081 if (!privileged) break; // only allow in privileged code
2082 return _method_ForceInline;
2083 }
2084 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2085 if (_location != _in_method) break; // only allow for methods
2086 if (!privileged) break; // only allow in privileged code
2087 return _method_DontInline;
2088 }
2089 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2090 if (_location != _in_method) break; // only allow for methods
2091 if (!privileged) break; // only allow in privileged code
2092 return _method_InjectedProfile;
2093 }
2094 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2095 if (_location != _in_method) break; // only allow for methods
2096 if (!privileged) break; // only allow in privileged code
2097 return _method_LambdaForm_Compiled;
2098 }
2099 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
2100 if (_location != _in_method) break; // only allow for methods
2101 if (!privileged) break; // only allow in privileged code
2102 return _method_Hidden;
2103 }
2104 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2105 if (_location != _in_method) break; // only allow for methods
2106 if (!privileged) break; // only allow in privileged code
2107 return _method_HotSpotIntrinsicCandidate;
2108 }
2109 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2110 if (_location != _in_field) break; // only allow for fields
2111 if (!privileged) break; // only allow in privileged code
2112 return _field_Stable;
2113 }
2114 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2115 if (_location != _in_field && _location != _in_class) {
2116 break; // only allow for fields and classes
2117 }
2118 if (!EnableContended || (RestrictContended && !privileged)) {
2119 break; // honor privileges
2120 }
2121 return _jdk_internal_vm_annotation_Contended;
2122 }
2123 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2124 if (_location != _in_method) break; // only allow for methods
2125 if (RestrictReservedStack && !privileged) break; // honor privileges
2126 return _jdk_internal_vm_annotation_ReservedStackAccess;
2127 }
2128 default: {
2129 break;
2130 }
2131 }
2132 return AnnotationCollector::_unknown;
2133 }
2134
2135 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2136 if (is_contended())
2137 f->set_contended_group(contended_group());
2138 if (is_stable())
2139 f->set_stable(true);
2140 }
2141
2142 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2143 // If there's an error deallocate metadata for field annotations
2144 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2145 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2146 }
2147
2148 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2149 if (has_annotation(_method_CallerSensitive))
2150 m->set_caller_sensitive(true);
2151 if (has_annotation(_method_ForceInline))
2152 m->set_force_inline(true);
2153 if (has_annotation(_method_DontInline))
2154 m->set_dont_inline(true);
2155 if (has_annotation(_method_InjectedProfile))
2156 m->set_has_injected_profile(true);
2157 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2158 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2159 if (has_annotation(_method_Hidden))
2160 m->set_hidden(true);
2161 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2162 m->set_intrinsic_candidate(true);
2163 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2164 m->set_has_reserved_stack_access(true);
2165 }
2166
2167 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2168 assert(ik != NULL, "invariant");
2169 ik->set_is_contended(is_contended());
2170 }
2171
2172 #define MAX_ARGS_SIZE 255
2173 #define MAX_CODE_SIZE 65535
2174 #define INITIAL_MAX_LVT_NUMBER 256
2175
2176 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2177 *
2178 * Rules for LVT's and LVTT's are:
2179 * - There can be any number of LVT's and LVTT's.
2180 * - If there are n LVT's, it is the same as if there was just
2181 * one LVT containing all the entries from the n LVT's.
2182 * - There may be no more than one LVT entry per local variable.
2183 * Two LVT entries are 'equal' if these fields are the same:
2184 * start_pc, length, name, slot
2185 * - There may be no more than one LVTT entry per each LVT entry.
2186 * Each LVTT entry has to match some LVT entry.
2187 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2188 */
2189 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2190 int lvt_cnt,
2191 u2* const localvariable_table_length,
2192 const unsafe_u2** const localvariable_table_start,
2193 int lvtt_cnt,
2194 u2* const localvariable_type_table_length,
2195 const unsafe_u2** const localvariable_type_table_start,
2196 TRAPS) {
2197
2198 ResourceMark rm(THREAD);
2199
2200 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2201 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2202
2203 LVT_HashTable* const table = new LVT_HashTable();
2204
2205 // To fill LocalVariableTable in
2206 const Classfile_LVT_Element* cf_lvt;
2207 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2208
2209 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2210 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2211 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2212 copy_lvt_element(&cf_lvt[idx], lvt);
2213 // If no duplicates, add LVT elem in hashtable.
2214 if (table->put(*lvt, lvt) == false
2215 && _need_verify
2216 && _major_version >= JAVA_1_5_VERSION) {
2217 classfile_parse_error("Duplicated LocalVariableTable attribute "
2218 "entry for '%s' in class file %s",
2219 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2220 CHECK);
2221 }
2222 }
2223 }
2224
2225 // To merge LocalVariableTable and LocalVariableTypeTable
2226 const Classfile_LVT_Element* cf_lvtt;
2227 LocalVariableTableElement lvtt_elem;
2228
2229 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2230 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2231 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2232 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2233 LocalVariableTableElement** entry = table->get(lvtt_elem);
2234 if (entry == NULL) {
2235 if (_need_verify) {
2236 classfile_parse_error("LVTT entry for '%s' in class file %s "
2237 "does not match any LVT entry",
2238 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2239 CHECK);
2240 }
2241 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2242 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2243 "entry for '%s' in class file %s",
2244 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2245 CHECK);
2246 } else {
2247 // to add generic signatures into LocalVariableTable
2248 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2249 }
2250 }
2251 }
2252 }
2253
2254
2255 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2256 const u1* runtime_visible_annotations,
2257 int runtime_visible_annotations_length,
2258 const u1* runtime_invisible_annotations,
2259 int runtime_invisible_annotations_length,
2260 const u1* runtime_visible_parameter_annotations,
2261 int runtime_visible_parameter_annotations_length,
2262 const u1* runtime_invisible_parameter_annotations,
2263 int runtime_invisible_parameter_annotations_length,
2264 const u1* runtime_visible_type_annotations,
2265 int runtime_visible_type_annotations_length,
2266 const u1* runtime_invisible_type_annotations,
2267 int runtime_invisible_type_annotations_length,
2268 const u1* annotation_default,
2269 int annotation_default_length,
2270 TRAPS) {
2271
2272 AnnotationArray* a;
2273
2274 if (runtime_visible_annotations_length +
2275 runtime_invisible_annotations_length > 0) {
2276 a = assemble_annotations(runtime_visible_annotations,
2277 runtime_visible_annotations_length,
2278 runtime_invisible_annotations,
2279 runtime_invisible_annotations_length,
2280 CHECK);
2281 cm->set_method_annotations(a);
2282 }
2283
2284 if (runtime_visible_parameter_annotations_length +
2285 runtime_invisible_parameter_annotations_length > 0) {
2286 a = assemble_annotations(runtime_visible_parameter_annotations,
2287 runtime_visible_parameter_annotations_length,
2288 runtime_invisible_parameter_annotations,
2289 runtime_invisible_parameter_annotations_length,
2290 CHECK);
2291 cm->set_parameter_annotations(a);
2292 }
2293
2294 if (annotation_default_length > 0) {
2295 a = assemble_annotations(annotation_default,
2296 annotation_default_length,
2297 NULL,
2298 0,
2299 CHECK);
2300 cm->set_default_annotations(a);
2301 }
2302
2303 if (runtime_visible_type_annotations_length +
2304 runtime_invisible_type_annotations_length > 0) {
2305 a = assemble_annotations(runtime_visible_type_annotations,
2306 runtime_visible_type_annotations_length,
2307 runtime_invisible_type_annotations,
2308 runtime_invisible_type_annotations_length,
2309 CHECK);
2310 cm->set_type_annotations(a);
2311 }
2312 }
2313
2314
2315 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2316 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2317 // Method* to save footprint, so we only know the size of the resulting Method* when the
2318 // entire method attribute is parsed.
2319 //
2320 // The promoted_flags parameter is used to pass relevant access_flags
2321 // from the method back up to the containing klass. These flag values
2322 // are added to klass's access_flags.
2323
2324 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2325 bool is_interface,
2326 const ConstantPool* cp,
2327 AccessFlags* const promoted_flags,
2328 TRAPS) {
2329 assert(cfs != NULL, "invariant");
2330 assert(cp != NULL, "invariant");
2331 assert(promoted_flags != NULL, "invariant");
2332
2333 ResourceMark rm(THREAD);
2334 // Parse fixed parts:
2335 // access_flags, name_index, descriptor_index, attributes_count
2336 cfs->guarantee_more(8, CHECK_NULL);
2337
2338 int flags = cfs->get_u2_fast();
2339 const u2 name_index = cfs->get_u2_fast();
2340 const int cp_size = cp->length();
2341 check_property(
2342 valid_symbol_at(name_index),
2343 "Illegal constant pool index %u for method name in class file %s",
2344 name_index, CHECK_NULL);
2345 const Symbol* const name = cp->symbol_at(name_index);
2346 verify_legal_method_name(name, CHECK_NULL);
2347
2348 const u2 signature_index = cfs->get_u2_fast();
2349 guarantee_property(
2350 valid_symbol_at(signature_index),
2351 "Illegal constant pool index %u for method signature in class file %s",
2352 signature_index, CHECK_NULL);
2353 const Symbol* const signature = cp->symbol_at(signature_index);
2354
2355 if (name == vmSymbols::class_initializer_name()) {
2356 // We ignore the other access flags for a valid class initializer.
2357 // (JVM Spec 2nd ed., chapter 4.6)
2358 if (_major_version < 51) { // backward compatibility
2359 flags = JVM_ACC_STATIC;
2360 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2361 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2362 } else {
2363 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2364 }
2365 } else {
2366 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2367 }
2368
2369 if (name == vmSymbols::object_initializer_name() && is_interface) {
2370 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2371 }
2372
2373 int args_size = -1; // only used when _need_verify is true
2374 if (_need_verify) {
2375 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2376 verify_legal_method_signature(name, signature, CHECK_NULL);
2377 if (args_size > MAX_ARGS_SIZE) {
2378 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2379 }
2380 }
2381
2382 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2383
2384 // Default values for code and exceptions attribute elements
2385 u2 max_stack = 0;
2386 u2 max_locals = 0;
2387 u4 code_length = 0;
2388 const u1* code_start = 0;
2389 u2 exception_table_length = 0;
2390 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2391 Array<int>* exception_handlers = Universe::the_empty_int_array();
2392 u2 checked_exceptions_length = 0;
2393 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2394 CompressedLineNumberWriteStream* linenumber_table = NULL;
2395 int linenumber_table_length = 0;
2396 int total_lvt_length = 0;
2397 u2 lvt_cnt = 0;
2398 u2 lvtt_cnt = 0;
2399 bool lvt_allocated = false;
2400 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2401 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2402 u2* localvariable_table_length = NULL;
2403 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2404 u2* localvariable_type_table_length = NULL;
2405 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2406 int method_parameters_length = -1;
2407 const u1* method_parameters_data = NULL;
2408 bool method_parameters_seen = false;
2409 bool parsed_code_attribute = false;
2410 bool parsed_checked_exceptions_attribute = false;
2411 bool parsed_stackmap_attribute = false;
2412 // stackmap attribute - JDK1.5
2413 const u1* stackmap_data = NULL;
2414 int stackmap_data_length = 0;
2415 u2 generic_signature_index = 0;
2416 MethodAnnotationCollector parsed_annotations;
2417 const u1* runtime_visible_annotations = NULL;
2418 int runtime_visible_annotations_length = 0;
2419 const u1* runtime_invisible_annotations = NULL;
2420 int runtime_invisible_annotations_length = 0;
2421 const u1* runtime_visible_parameter_annotations = NULL;
2422 int runtime_visible_parameter_annotations_length = 0;
2423 const u1* runtime_invisible_parameter_annotations = NULL;
2424 int runtime_invisible_parameter_annotations_length = 0;
2425 const u1* runtime_visible_type_annotations = NULL;
2426 int runtime_visible_type_annotations_length = 0;
2427 const u1* runtime_invisible_type_annotations = NULL;
2428 int runtime_invisible_type_annotations_length = 0;
2429 bool runtime_invisible_annotations_exists = false;
2430 bool runtime_invisible_type_annotations_exists = false;
2431 bool runtime_invisible_parameter_annotations_exists = false;
2432 const u1* annotation_default = NULL;
2433 int annotation_default_length = 0;
2434
2435 // Parse code and exceptions attribute
2436 u2 method_attributes_count = cfs->get_u2_fast();
2437 while (method_attributes_count--) {
2438 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2439 const u2 method_attribute_name_index = cfs->get_u2_fast();
2440 const u4 method_attribute_length = cfs->get_u4_fast();
2441 check_property(
2442 valid_symbol_at(method_attribute_name_index),
2443 "Invalid method attribute name index %u in class file %s",
2444 method_attribute_name_index, CHECK_NULL);
2445
2446 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2447 if (method_attribute_name == vmSymbols::tag_code()) {
2448 // Parse Code attribute
2449 if (_need_verify) {
2450 guarantee_property(
2451 !access_flags.is_native() && !access_flags.is_abstract(),
2452 "Code attribute in native or abstract methods in class file %s",
2453 CHECK_NULL);
2454 }
2455 if (parsed_code_attribute) {
2456 classfile_parse_error("Multiple Code attributes in class file %s",
2457 CHECK_NULL);
2458 }
2459 parsed_code_attribute = true;
2460
2461 // Stack size, locals size, and code size
2462 cfs->guarantee_more(8, CHECK_NULL);
2463 max_stack = cfs->get_u2_fast();
2464 max_locals = cfs->get_u2_fast();
2465 code_length = cfs->get_u4_fast();
2466 if (_need_verify) {
2467 guarantee_property(args_size <= max_locals,
2468 "Arguments can't fit into locals in class file %s",
2469 CHECK_NULL);
2470 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2471 "Invalid method Code length %u in class file %s",
2472 code_length, CHECK_NULL);
2473 }
2474 // Code pointer
2475 code_start = cfs->current();
2476 assert(code_start != NULL, "null code start");
2477 cfs->guarantee_more(code_length, CHECK_NULL);
2478 cfs->skip_u1_fast(code_length);
2479
2480 // Exception handler table
2481 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2482 exception_table_length = cfs->get_u2_fast();
2483 if (exception_table_length > 0) {
2484 exception_table_start = parse_exception_table(cfs,
2485 code_length,
2486 exception_table_length,
2487 CHECK_NULL);
2488 }
2489
2490 // Parse additional attributes in code attribute
2491 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2492 u2 code_attributes_count = cfs->get_u2_fast();
2493
2494 unsigned int calculated_attribute_length = 0;
2495
2496 calculated_attribute_length =
2497 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2498 calculated_attribute_length +=
2499 code_length +
2500 sizeof(exception_table_length) +
2501 sizeof(code_attributes_count) +
2502 exception_table_length *
2503 ( sizeof(u2) + // start_pc
2504 sizeof(u2) + // end_pc
2505 sizeof(u2) + // handler_pc
2506 sizeof(u2) ); // catch_type_index
2507
2508 while (code_attributes_count--) {
2509 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2510 const u2 code_attribute_name_index = cfs->get_u2_fast();
2511 const u4 code_attribute_length = cfs->get_u4_fast();
2512 calculated_attribute_length += code_attribute_length +
2513 sizeof(code_attribute_name_index) +
2514 sizeof(code_attribute_length);
2515 check_property(valid_symbol_at(code_attribute_name_index),
2516 "Invalid code attribute name index %u in class file %s",
2517 code_attribute_name_index,
2518 CHECK_NULL);
2519 if (LoadLineNumberTables &&
2520 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2521 // Parse and compress line number table
2522 parse_linenumber_table(code_attribute_length,
2523 code_length,
2524 &linenumber_table,
2525 CHECK_NULL);
2526
2527 } else if (LoadLocalVariableTables &&
2528 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2529 // Parse local variable table
2530 if (!lvt_allocated) {
2531 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2532 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2533 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2534 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2535 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2536 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2537 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2538 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2539 lvt_allocated = true;
2540 }
2541 if (lvt_cnt == max_lvt_cnt) {
2542 max_lvt_cnt <<= 1;
2543 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2544 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2545 }
2546 localvariable_table_start[lvt_cnt] =
2547 parse_localvariable_table(cfs,
2548 code_length,
2549 max_locals,
2550 code_attribute_length,
2551 &localvariable_table_length[lvt_cnt],
2552 false, // is not LVTT
2553 CHECK_NULL);
2554 total_lvt_length += localvariable_table_length[lvt_cnt];
2555 lvt_cnt++;
2556 } else if (LoadLocalVariableTypeTables &&
2557 _major_version >= JAVA_1_5_VERSION &&
2558 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2559 if (!lvt_allocated) {
2560 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2561 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2562 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2563 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2564 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2565 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2566 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2567 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2568 lvt_allocated = true;
2569 }
2570 // Parse local variable type table
2571 if (lvtt_cnt == max_lvtt_cnt) {
2572 max_lvtt_cnt <<= 1;
2573 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2574 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2575 }
2576 localvariable_type_table_start[lvtt_cnt] =
2577 parse_localvariable_table(cfs,
2578 code_length,
2579 max_locals,
2580 code_attribute_length,
2581 &localvariable_type_table_length[lvtt_cnt],
2582 true, // is LVTT
2583 CHECK_NULL);
2584 lvtt_cnt++;
2585 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2586 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2587 // Stack map is only needed by the new verifier in JDK1.5.
2588 if (parsed_stackmap_attribute) {
2589 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2590 }
2591 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2592 stackmap_data_length = code_attribute_length;
2593 parsed_stackmap_attribute = true;
2594 } else {
2595 // Skip unknown attributes
2596 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2597 }
2598 }
2599 // check method attribute length
2600 if (_need_verify) {
2601 guarantee_property(method_attribute_length == calculated_attribute_length,
2602 "Code segment has wrong length in class file %s",
2603 CHECK_NULL);
2604 }
2605 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2606 // Parse Exceptions attribute
2607 if (parsed_checked_exceptions_attribute) {
2608 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2609 CHECK_NULL);
2610 }
2611 parsed_checked_exceptions_attribute = true;
2612 checked_exceptions_start =
2613 parse_checked_exceptions(cfs,
2614 &checked_exceptions_length,
2615 method_attribute_length,
2616 CHECK_NULL);
2617 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2618 // reject multiple method parameters
2619 if (method_parameters_seen) {
2620 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2621 CHECK_NULL);
2622 }
2623 method_parameters_seen = true;
2624 method_parameters_length = cfs->get_u1_fast();
2625 const u2 real_length = (method_parameters_length * 4u) + 1u;
2626 if (method_attribute_length != real_length) {
2627 classfile_parse_error(
2628 "Invalid MethodParameters method attribute length %u in class file",
2629 method_attribute_length, CHECK_NULL);
2630 }
2631 method_parameters_data = cfs->current();
2632 cfs->skip_u2_fast(method_parameters_length);
2633 cfs->skip_u2_fast(method_parameters_length);
2634 // ignore this attribute if it cannot be reflected
2635 if (!SystemDictionary::Parameter_klass_loaded())
2636 method_parameters_length = -1;
2637 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2638 if (method_attribute_length != 0) {
2639 classfile_parse_error(
2640 "Invalid Synthetic method attribute length %u in class file %s",
2641 method_attribute_length, CHECK_NULL);
2642 }
2643 // Should we check that there hasn't already been a synthetic attribute?
2644 access_flags.set_is_synthetic();
2645 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2646 if (method_attribute_length != 0) {
2647 classfile_parse_error(
2648 "Invalid Deprecated method attribute length %u in class file %s",
2649 method_attribute_length, CHECK_NULL);
2650 }
2651 } else if (_major_version >= JAVA_1_5_VERSION) {
2652 if (method_attribute_name == vmSymbols::tag_signature()) {
2653 if (generic_signature_index != 0) {
2654 classfile_parse_error(
2655 "Multiple Signature attributes for method in class file %s",
2656 CHECK_NULL);
2657 }
2658 if (method_attribute_length != 2) {
2659 classfile_parse_error(
2660 "Invalid Signature attribute length %u in class file %s",
2661 method_attribute_length, CHECK_NULL);
2662 }
2663 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2664 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2665 if (runtime_visible_annotations != NULL) {
2666 classfile_parse_error(
2667 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2668 CHECK_NULL);
2669 }
2670 runtime_visible_annotations_length = method_attribute_length;
2671 runtime_visible_annotations = cfs->current();
2672 assert(runtime_visible_annotations != NULL, "null visible annotations");
2673 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2674 parse_annotations(cp,
2675 runtime_visible_annotations,
2676 runtime_visible_annotations_length,
2677 &parsed_annotations,
2678 _loader_data,
2679 _can_access_vm_annotations,
2680 CHECK_NULL);
2681 cfs->skip_u1_fast(runtime_visible_annotations_length);
2682 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2683 if (runtime_invisible_annotations_exists) {
2684 classfile_parse_error(
2685 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2686 CHECK_NULL);
2687 }
2688 runtime_invisible_annotations_exists = true;
2689 if (PreserveAllAnnotations) {
2690 runtime_invisible_annotations_length = method_attribute_length;
2691 runtime_invisible_annotations = cfs->current();
2692 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2693 }
2694 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2695 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2696 if (runtime_visible_parameter_annotations != NULL) {
2697 classfile_parse_error(
2698 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2699 CHECK_NULL);
2700 }
2701 runtime_visible_parameter_annotations_length = method_attribute_length;
2702 runtime_visible_parameter_annotations = cfs->current();
2703 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2704 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2705 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2706 if (runtime_invisible_parameter_annotations_exists) {
2707 classfile_parse_error(
2708 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2709 CHECK_NULL);
2710 }
2711 runtime_invisible_parameter_annotations_exists = true;
2712 if (PreserveAllAnnotations) {
2713 runtime_invisible_parameter_annotations_length = method_attribute_length;
2714 runtime_invisible_parameter_annotations = cfs->current();
2715 assert(runtime_invisible_parameter_annotations != NULL,
2716 "null invisible parameter annotations");
2717 }
2718 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2719 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2720 if (annotation_default != NULL) {
2721 classfile_parse_error(
2722 "Multiple AnnotationDefault attributes for method in class file %s",
2723 CHECK_NULL);
2724 }
2725 annotation_default_length = method_attribute_length;
2726 annotation_default = cfs->current();
2727 assert(annotation_default != NULL, "null annotation default");
2728 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2729 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2730 if (runtime_visible_type_annotations != NULL) {
2731 classfile_parse_error(
2732 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2733 CHECK_NULL);
2734 }
2735 runtime_visible_type_annotations_length = method_attribute_length;
2736 runtime_visible_type_annotations = cfs->current();
2737 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2738 // No need for the VM to parse Type annotations
2739 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2740 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2741 if (runtime_invisible_type_annotations_exists) {
2742 classfile_parse_error(
2743 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2744 CHECK_NULL);
2745 } else {
2746 runtime_invisible_type_annotations_exists = true;
2747 }
2748 if (PreserveAllAnnotations) {
2749 runtime_invisible_type_annotations_length = method_attribute_length;
2750 runtime_invisible_type_annotations = cfs->current();
2751 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2752 }
2753 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2754 } else {
2755 // Skip unknown attributes
2756 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2757 }
2758 } else {
2759 // Skip unknown attributes
2760 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2761 }
2762 }
2763
2764 if (linenumber_table != NULL) {
2765 linenumber_table->write_terminator();
2766 linenumber_table_length = linenumber_table->position();
2767 }
2768
2769 // Make sure there's at least one Code attribute in non-native/non-abstract method
2770 if (_need_verify) {
2771 guarantee_property(access_flags.is_native() ||
2772 access_flags.is_abstract() ||
2773 parsed_code_attribute,
2774 "Absent Code attribute in method that is not native or abstract in class file %s",
2775 CHECK_NULL);
2776 }
2777
2778 // All sizing information for a Method* is finally available, now create it
2779 InlineTableSizes sizes(
2780 total_lvt_length,
2781 linenumber_table_length,
2782 exception_table_length,
2783 checked_exceptions_length,
2784 method_parameters_length,
2785 generic_signature_index,
2786 runtime_visible_annotations_length +
2787 runtime_invisible_annotations_length,
2788 runtime_visible_parameter_annotations_length +
2789 runtime_invisible_parameter_annotations_length,
2790 runtime_visible_type_annotations_length +
2791 runtime_invisible_type_annotations_length,
2792 annotation_default_length,
2793 0);
2794
2795 Method* const m = Method::allocate(_loader_data,
2796 code_length,
2797 access_flags,
2798 &sizes,
2799 ConstMethod::NORMAL,
2800 CHECK_NULL);
2801
2802 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2803
2804 // Fill in information from fixed part (access_flags already set)
2805 m->set_constants(_cp);
2806 m->set_name_index(name_index);
2807 m->set_signature_index(signature_index);
2808 m->compute_from_signature(cp->symbol_at(signature_index));
2809 assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2810
2811 // Fill in code attribute information
2812 m->set_max_stack(max_stack);
2813 m->set_max_locals(max_locals);
2814 if (stackmap_data != NULL) {
2815 m->constMethod()->copy_stackmap_data(_loader_data,
2816 (u1*)stackmap_data,
2817 stackmap_data_length,
2818 CHECK_NULL);
2819 }
2820
2821 // Copy byte codes
2822 m->set_code((u1*)code_start);
2823
2824 // Copy line number table
2825 if (linenumber_table != NULL) {
2826 memcpy(m->compressed_linenumber_table(),
2827 linenumber_table->buffer(),
2828 linenumber_table_length);
2829 }
2830
2831 // Copy exception table
2832 if (exception_table_length > 0) {
2833 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2834 m->exception_table_start(),
2835 exception_table_length * sizeof(ExceptionTableElement),
2836 sizeof(u2));
2837 }
2838
2839 // Copy method parameters
2840 if (method_parameters_length > 0) {
2841 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2842 for (int i = 0; i < method_parameters_length; i++) {
2843 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2844 method_parameters_data += 2;
2845 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2846 method_parameters_data += 2;
2847 }
2848 }
2849
2850 // Copy checked exceptions
2851 if (checked_exceptions_length > 0) {
2852 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2853 m->checked_exceptions_start(),
2854 checked_exceptions_length * sizeof(CheckedExceptionElement),
2855 sizeof(u2));
2856 }
2857
2858 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2859 if (total_lvt_length > 0) {
2860 promoted_flags->set_has_localvariable_table();
2861 copy_localvariable_table(m->constMethod(),
2862 lvt_cnt,
2863 localvariable_table_length,
2864 localvariable_table_start,
2865 lvtt_cnt,
2866 localvariable_type_table_length,
2867 localvariable_type_table_start,
2868 CHECK_NULL);
2869 }
2870
2871 if (parsed_annotations.has_any_annotations())
2872 parsed_annotations.apply_to(methodHandle(THREAD, m));
2873
2874 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2875 m->set_hidden(true);
2876 }
2877
2878 // Copy annotations
2879 copy_method_annotations(m->constMethod(),
2880 runtime_visible_annotations,
2881 runtime_visible_annotations_length,
2882 runtime_invisible_annotations,
2883 runtime_invisible_annotations_length,
2884 runtime_visible_parameter_annotations,
2885 runtime_visible_parameter_annotations_length,
2886 runtime_invisible_parameter_annotations,
2887 runtime_invisible_parameter_annotations_length,
2888 runtime_visible_type_annotations,
2889 runtime_visible_type_annotations_length,
2890 runtime_invisible_type_annotations,
2891 runtime_invisible_type_annotations_length,
2892 annotation_default,
2893 annotation_default_length,
2894 CHECK_NULL);
2895
2896 if (name == vmSymbols::finalize_method_name() &&
2897 signature == vmSymbols::void_method_signature()) {
2898 if (m->is_empty_method()) {
2899 _has_empty_finalizer = true;
2900 } else {
2901 _has_finalizer = true;
2902 }
2903 }
2904 if (name == vmSymbols::object_initializer_name() &&
2905 signature == vmSymbols::void_method_signature() &&
2906 m->is_vanilla_constructor()) {
2907 _has_vanilla_constructor = true;
2908 }
2909
2910 NOT_PRODUCT(m->verify());
2911 return m;
2912 }
2913
2914
2915 // The promoted_flags parameter is used to pass relevant access_flags
2916 // from the methods back up to the containing klass. These flag values
2917 // are added to klass's access_flags.
2918 // Side-effects: populates the _methods field in the parser
2919 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2920 bool is_interface,
2921 AccessFlags* promoted_flags,
2922 bool* has_final_method,
2923 bool* declares_nonstatic_concrete_methods,
2924 TRAPS) {
2925 assert(cfs != NULL, "invariant");
2926 assert(promoted_flags != NULL, "invariant");
2927 assert(has_final_method != NULL, "invariant");
2928 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2929
2930 assert(NULL == _methods, "invariant");
2931
2932 cfs->guarantee_more(2, CHECK); // length
2933 const u2 length = cfs->get_u2_fast();
2934 if (length == 0) {
2935 _methods = Universe::the_empty_method_array();
2936 } else {
2937 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2938 length,
2939 NULL,
2940 CHECK);
2941
2942 for (int index = 0; index < length; index++) {
2943 Method* method = parse_method(cfs,
2944 is_interface,
2945 _cp,
2946 promoted_flags,
2947 CHECK);
2948
2949 if (method->is_final()) {
2950 *has_final_method = true;
2951 }
2952 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2953 // used for interface initialization, and default method inheritance analysis
2954 if (is_interface && !(*declares_nonstatic_concrete_methods)
2955 && !method->is_abstract() && !method->is_static()) {
2956 *declares_nonstatic_concrete_methods = true;
2957 }
2958 _methods->at_put(index, method);
2959 }
2960
2961 if (_need_verify && length > 1) {
2962 // Check duplicated methods
2963 ResourceMark rm(THREAD);
2964 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2965 THREAD, NameSigHash*, HASH_ROW_SIZE);
2966 initialize_hashtable(names_and_sigs);
2967 bool dup = false;
2968 const Symbol* name = NULL;
2969 const Symbol* sig = NULL;
2970 {
2971 debug_only(NoSafepointVerifier nsv;)
2972 for (int i = 0; i < length; i++) {
2973 const Method* const m = _methods->at(i);
2974 name = m->name();
2975 sig = m->signature();
2976 // If no duplicates, add name/signature in hashtable names_and_sigs.
2977 if (!put_after_lookup(name, sig, names_and_sigs)) {
2978 dup = true;
2979 break;
2980 }
2981 }
2982 }
2983 if (dup) {
2984 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2985 name->as_C_string(), sig->as_klass_external_name(), CHECK);
2986 }
2987 }
2988 }
2989 }
2990
2991 static const intArray* sort_methods(Array<Method*>* methods) {
2992 const int length = methods->length();
2993 // If JVMTI original method ordering or sharing is enabled we have to
2994 // remember the original class file ordering.
2995 // We temporarily use the vtable_index field in the Method* to store the
2996 // class file index, so we can read in after calling qsort.
2997 // Put the method ordering in the shared archive.
2998 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) {
2999 for (int index = 0; index < length; index++) {
3000 Method* const m = methods->at(index);
3001 assert(!m->valid_vtable_index(), "vtable index should not be set");
3002 m->set_vtable_index(index);
3003 }
3004 }
3005 // Sort method array by ascending method name (for faster lookups & vtable construction)
3006 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3007 Method::sort_methods(methods);
3008
3009 intArray* method_ordering = NULL;
3010 // If JVMTI original method ordering or sharing is enabled construct int
3011 // array remembering the original ordering
3012 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) {
3013 method_ordering = new intArray(length, length, -1);
3014 for (int index = 0; index < length; index++) {
3015 Method* const m = methods->at(index);
3016 const int old_index = m->vtable_index();
3017 assert(old_index >= 0 && old_index < length, "invalid method index");
3018 method_ordering->at_put(index, old_index);
3019 m->set_vtable_index(Method::invalid_vtable_index);
3020 }
3021 }
3022 return method_ordering;
3023 }
3024
3025 // Parse generic_signature attribute for methods and fields
3026 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3027 TRAPS) {
3028 assert(cfs != NULL, "invariant");
3029
3030 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3031 const u2 generic_signature_index = cfs->get_u2_fast();
3032 check_property(
3033 valid_symbol_at(generic_signature_index),
3034 "Invalid Signature attribute at constant pool index %u in class file %s",
3035 generic_signature_index, CHECK_0);
3036 return generic_signature_index;
3037 }
3038
3039 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3040 TRAPS) {
3041
3042 assert(cfs != NULL, "invariant");
3043
3044 cfs->guarantee_more(2, CHECK); // sourcefile_index
3045 const u2 sourcefile_index = cfs->get_u2_fast();
3046 check_property(
3047 valid_symbol_at(sourcefile_index),
3048 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3049 sourcefile_index, CHECK);
3050 set_class_sourcefile_index(sourcefile_index);
3051 }
3052
3053 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3054 int length,
3055 TRAPS) {
3056 assert(cfs != NULL, "invariant");
3057
3058 const u1* const sde_buffer = cfs->current();
3059 assert(sde_buffer != NULL, "null sde buffer");
3060
3061 // Don't bother storing it if there is no way to retrieve it
3062 if (JvmtiExport::can_get_source_debug_extension()) {
3063 assert((length+1) > length, "Overflow checking");
3064 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3065 for (int i = 0; i < length; i++) {
3066 sde[i] = sde_buffer[i];
3067 }
3068 sde[length] = '\0';
3069 set_class_sde_buffer((const char*)sde, length);
3070 }
3071 // Got utf8 string, set stream position forward
3072 cfs->skip_u1(length, CHECK);
3073 }
3074
3075
3076 // Inner classes can be static, private or protected (classic VM does this)
3077 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3078 JVM_ACC_PRIVATE | \
3079 JVM_ACC_PROTECTED | \
3080 JVM_ACC_STATIC \
3081 )
3082
3083 // Return number of classes in the inner classes attribute table
3084 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3085 const u1* const inner_classes_attribute_start,
3086 bool parsed_enclosingmethod_attribute,
3087 u2 enclosing_method_class_index,
3088 u2 enclosing_method_method_index,
3089 TRAPS) {
3090 const u1* const current_mark = cfs->current();
3091 u2 length = 0;
3092 if (inner_classes_attribute_start != NULL) {
3093 cfs->set_current(inner_classes_attribute_start);
3094 cfs->guarantee_more(2, CHECK_0); // length
3095 length = cfs->get_u2_fast();
3096 }
3097
3098 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3099 // method data:
3100 // [inner_class_info_index,
3101 // outer_class_info_index,
3102 // inner_name_index,
3103 // inner_class_access_flags,
3104 // ...
3105 // enclosing_method_class_index,
3106 // enclosing_method_method_index]
3107 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3108 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3109 _inner_classes = inner_classes;
3110
3111 int index = 0;
3112 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3113 for (int n = 0; n < length; n++) {
3114 // Inner class index
3115 const u2 inner_class_info_index = cfs->get_u2_fast();
3116 check_property(
3117 valid_klass_reference_at(inner_class_info_index),
3118 "inner_class_info_index %u has bad constant type in class file %s",
3119 inner_class_info_index, CHECK_0);
3120 // Outer class index
3121 const u2 outer_class_info_index = cfs->get_u2_fast();
3122 check_property(
3123 outer_class_info_index == 0 ||
3124 valid_klass_reference_at(outer_class_info_index),
3125 "outer_class_info_index %u has bad constant type in class file %s",
3126 outer_class_info_index, CHECK_0);
3127 // Inner class name
3128 const u2 inner_name_index = cfs->get_u2_fast();
3129 check_property(
3130 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3131 "inner_name_index %u has bad constant type in class file %s",
3132 inner_name_index, CHECK_0);
3133 if (_need_verify) {
3134 guarantee_property(inner_class_info_index != outer_class_info_index,
3135 "Class is both outer and inner class in class file %s", CHECK_0);
3136 }
3137 // Access flags
3138 jint flags;
3139 // JVM_ACC_MODULE is defined in JDK-9 and later.
3140 if (_major_version >= JAVA_9_VERSION) {
3141 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3142 } else {
3143 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3144 }
3145 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3146 // Set abstract bit for old class files for backward compatibility
3147 flags |= JVM_ACC_ABSTRACT;
3148 }
3149 verify_legal_class_modifiers(flags, CHECK_0);
3150 AccessFlags inner_access_flags(flags);
3151
3152 inner_classes->at_put(index++, inner_class_info_index);
3153 inner_classes->at_put(index++, outer_class_info_index);
3154 inner_classes->at_put(index++, inner_name_index);
3155 inner_classes->at_put(index++, inner_access_flags.as_short());
3156 }
3157
3158 // 4347400: make sure there's no duplicate entry in the classes array
3159 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3160 for(int i = 0; i < length * 4; i += 4) {
3161 for(int j = i + 4; j < length * 4; j += 4) {
3162 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3163 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3164 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3165 inner_classes->at(i+3) != inner_classes->at(j+3)),
3166 "Duplicate entry in InnerClasses in class file %s",
3167 CHECK_0);
3168 }
3169 }
3170 }
3171
3172 // Set EnclosingMethod class and method indexes.
3173 if (parsed_enclosingmethod_attribute) {
3174 inner_classes->at_put(index++, enclosing_method_class_index);
3175 inner_classes->at_put(index++, enclosing_method_method_index);
3176 }
3177 assert(index == size, "wrong size");
3178
3179 // Restore buffer's current position.
3180 cfs->set_current(current_mark);
3181
3182 return length;
3183 }
3184
3185 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3186 const u1* const nest_members_attribute_start,
3187 TRAPS) {
3188 const u1* const current_mark = cfs->current();
3189 u2 length = 0;
3190 if (nest_members_attribute_start != NULL) {
3191 cfs->set_current(nest_members_attribute_start);
3192 cfs->guarantee_more(2, CHECK_0); // length
3193 length = cfs->get_u2_fast();
3194 }
3195 const int size = length;
3196 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3197 _nest_members = nest_members;
3198
3199 int index = 0;
3200 cfs->guarantee_more(2 * length, CHECK_0);
3201 for (int n = 0; n < length; n++) {
3202 const u2 class_info_index = cfs->get_u2_fast();
3203 check_property(
3204 valid_klass_reference_at(class_info_index),
3205 "Nest member class_info_index %u has bad constant type in class file %s",
3206 class_info_index, CHECK_0);
3207 nest_members->at_put(index++, class_info_index);
3208 }
3209 assert(index == size, "wrong size");
3210
3211 // Restore buffer's current position.
3212 cfs->set_current(current_mark);
3213
3214 return length;
3215 }
3216
3217 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3218 const u1* const permitted_subclasses_attribute_start,
3219 TRAPS) {
3220 const u1* const current_mark = cfs->current();
3221 u2 length = 0;
3222 if (permitted_subclasses_attribute_start != NULL) {
3223 cfs->set_current(permitted_subclasses_attribute_start);
3224 cfs->guarantee_more(2, CHECK_0); // length
3225 length = cfs->get_u2_fast();
3226 }
3227 if (length < 1) {
3228 classfile_parse_error("PermittedSubclasses attribute is empty in class file %s", CHECK_0);
3229 }
3230 const int size = length;
3231 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3232 _permitted_subclasses = permitted_subclasses;
3233
3234 int index = 0;
3235 cfs->guarantee_more(2 * length, CHECK_0);
3236 for (int n = 0; n < length; n++) {
3237 const u2 class_info_index = cfs->get_u2_fast();
3238 check_property(
3239 valid_klass_reference_at(class_info_index),
3240 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3241 class_info_index, CHECK_0);
3242 permitted_subclasses->at_put(index++, class_info_index);
3243 }
3244 assert(index == size, "wrong size");
3245
3246 // Restore buffer's current position.
3247 cfs->set_current(current_mark);
3248
3249 return length;
3250 }
3251
3252 // Record {
3253 // u2 attribute_name_index;
3254 // u4 attribute_length;
3255 // u2 components_count;
3256 // component_info components[components_count];
3257 // }
3258 // component_info {
3259 // u2 name_index;
3260 // u2 descriptor_index
3261 // u2 attributes_count;
3262 // attribute_info_attributes[attributes_count];
3263 // }
3264 u2 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3265 const ConstantPool* cp,
3266 const u1* const record_attribute_start,
3267 TRAPS) {
3268 const u1* const current_mark = cfs->current();
3269 int components_count = 0;
3270 unsigned int calculate_attr_size = 0;
3271 if (record_attribute_start != NULL) {
3272 cfs->set_current(record_attribute_start);
3273 cfs->guarantee_more(2, CHECK_0); // num of components
3274 components_count = (int)cfs->get_u2_fast();
3275 calculate_attr_size = 2;
3276 }
3277
3278 Array<RecordComponent*>* const record_components =
3279 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, NULL, CHECK_0);
3280 _record_components = record_components;
3281
3282 for (int x = 0; x < components_count; x++) {
3283 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3284
3285 const u2 name_index = cfs->get_u2_fast();
3286 check_property(valid_symbol_at(name_index),
3287 "Invalid constant pool index %u for name in Record attribute in class file %s",
3288 name_index, CHECK_0);
3289 const Symbol* const name = cp->symbol_at(name_index);
3290 verify_legal_field_name(name, CHECK_0);
3291
3292 const u2 descriptor_index = cfs->get_u2_fast();
3293 check_property(valid_symbol_at(descriptor_index),
3294 "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3295 descriptor_index, CHECK_0);
3296 const Symbol* const descr = cp->symbol_at(descriptor_index);
3297 verify_legal_field_signature(name, descr, CHECK_0);
3298
3299 const u2 attributes_count = cfs->get_u2_fast();
3300 calculate_attr_size += 6;
3301 u2 generic_sig_index = 0;
3302 const u1* runtime_visible_annotations = NULL;
3303 int runtime_visible_annotations_length = 0;
3304 const u1* runtime_invisible_annotations = NULL;
3305 int runtime_invisible_annotations_length = 0;
3306 bool runtime_invisible_annotations_exists = false;
3307 const u1* runtime_visible_type_annotations = NULL;
3308 int runtime_visible_type_annotations_length = 0;
3309 const u1* runtime_invisible_type_annotations = NULL;
3310 int runtime_invisible_type_annotations_length = 0;
3311 bool runtime_invisible_type_annotations_exists = false;
3312
3313 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3314 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
3315 for (int y = 0; y < attributes_count; y++) {
3316 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
3317 const u2 attribute_name_index = cfs->get_u2_fast();
3318 const u4 attribute_length = cfs->get_u4_fast();
3319 calculate_attr_size += 6;
3320 check_property(
3321 valid_symbol_at(attribute_name_index),
3322 "Invalid Record attribute name index %u in class file %s",
3323 attribute_name_index, CHECK_0);
3324
3325 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3326 if (attribute_name == vmSymbols::tag_signature()) {
3327 if (generic_sig_index != 0) {
3328 classfile_parse_error(
3329 "Multiple Signature attributes for Record component in class file %s",
3330 CHECK_0);
3331 }
3332 if (attribute_length != 2) {
3333 classfile_parse_error(
3334 "Invalid Signature attribute length %u in Record component in class file %s",
3335 attribute_length, CHECK_0);
3336 }
3337 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3338
3339 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3340 if (runtime_visible_annotations != NULL) {
3341 classfile_parse_error(
3342 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", CHECK_0);
3343 }
3344 runtime_visible_annotations_length = attribute_length;
3345 runtime_visible_annotations = cfs->current();
3346
3347 assert(runtime_visible_annotations != NULL, "null record component visible annotation");
3348 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3349 cfs->skip_u1_fast(runtime_visible_annotations_length);
3350
3351 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3352 if (runtime_invisible_annotations_exists) {
3353 classfile_parse_error(
3354 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", CHECK_0);
3355 }
3356 runtime_invisible_annotations_exists = true;
3357 if (PreserveAllAnnotations) {
3358 runtime_invisible_annotations_length = attribute_length;
3359 runtime_invisible_annotations = cfs->current();
3360 assert(runtime_invisible_annotations != NULL, "null record component invisible annotation");
3361 }
3362 cfs->skip_u1(attribute_length, CHECK_0);
3363
3364 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3365 if (runtime_visible_type_annotations != NULL) {
3366 classfile_parse_error(
3367 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", CHECK_0);
3368 }
3369 runtime_visible_type_annotations_length = attribute_length;
3370 runtime_visible_type_annotations = cfs->current();
3371
3372 assert(runtime_visible_type_annotations != NULL, "null record component visible type annotation");
3373 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3374 cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3375
3376 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3377 if (runtime_invisible_type_annotations_exists) {
3378 classfile_parse_error(
3379 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", CHECK_0);
3380 }
3381 runtime_invisible_type_annotations_exists = true;
3382 if (PreserveAllAnnotations) {
3383 runtime_invisible_type_annotations_length = attribute_length;
3384 runtime_invisible_type_annotations = cfs->current();
3385 assert(runtime_invisible_type_annotations != NULL, "null record component invisible type annotation");
3386 }
3387 cfs->skip_u1(attribute_length, CHECK_0);
3388
3389 } else {
3390 // Skip unknown attributes
3391 cfs->skip_u1(attribute_length, CHECK_0);
3392 }
3393 calculate_attr_size += attribute_length;
3394 } // End of attributes For loop
3395
3396 AnnotationArray* annotations = assemble_annotations(runtime_visible_annotations,
3397 runtime_visible_annotations_length,
3398 runtime_invisible_annotations,
3399 runtime_invisible_annotations_length,
3400 CHECK_0);
3401 AnnotationArray* type_annotations = assemble_annotations(runtime_visible_type_annotations,
3402 runtime_visible_type_annotations_length,
3403 runtime_invisible_type_annotations,
3404 runtime_invisible_type_annotations_length,
3405 CHECK_0);
3406
3407 RecordComponent* record_component =
3408 RecordComponent::allocate(_loader_data, name_index, descriptor_index,
3409 attributes_count, generic_sig_index,
3410 annotations, type_annotations, CHECK_0);
3411 record_components->at_put(x, record_component);
3412 } // End of component processing loop
3413
3414 // Restore buffer's current position.
3415 cfs->set_current(current_mark);
3416 return calculate_attr_size;
3417 }
3418
3419 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3420 set_class_synthetic_flag(true);
3421 }
3422
3423 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3424 assert(cfs != NULL, "invariant");
3425
3426 const u2 signature_index = cfs->get_u2(CHECK);
3427 check_property(
3428 valid_symbol_at(signature_index),
3429 "Invalid constant pool index %u in Signature attribute in class file %s",
3430 signature_index, CHECK);
3431 set_class_generic_signature_index(signature_index);
3432 }
3433
3434 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3435 ConstantPool* cp,
3436 u4 attribute_byte_length,
3437 TRAPS) {
3438 assert(cfs != NULL, "invariant");
3439 assert(cp != NULL, "invariant");
3440
3441 const u1* const current_start = cfs->current();
3442
3443 guarantee_property(attribute_byte_length >= sizeof(u2),
3444 "Invalid BootstrapMethods attribute length %u in class file %s",
3445 attribute_byte_length,
3446 CHECK);
3447
3448 cfs->guarantee_more(attribute_byte_length, CHECK);
3449
3450 const int attribute_array_length = cfs->get_u2_fast();
3451
3452 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3453 "Short length on BootstrapMethods in class file %s",
3454 CHECK);
3455
3456
3457 // The attribute contains a counted array of counted tuples of shorts,
3458 // represending bootstrap specifiers:
3459 // length*{bootstrap_method_index, argument_count*{argument_index}}
3460 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3461 // operand_count = number of shorts in attr, except for leading length
3462
3463 // The attribute is copied into a short[] array.
3464 // The array begins with a series of short[2] pairs, one for each tuple.
3465 const int index_size = (attribute_array_length * 2);
3466
3467 Array<u2>* const operands =
3468 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3469
3470 // Eagerly assign operands so they will be deallocated with the constant
3471 // pool if there is an error.
3472 cp->set_operands(operands);
3473
3474 int operand_fill_index = index_size;
3475 const int cp_size = cp->length();
3476
3477 for (int n = 0; n < attribute_array_length; n++) {
3478 // Store a 32-bit offset into the header of the operand array.
3479 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3480
3481 // Read a bootstrap specifier.
3482 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3483 const u2 bootstrap_method_index = cfs->get_u2_fast();
3484 const u2 argument_count = cfs->get_u2_fast();
3485 check_property(
3486 valid_cp_range(bootstrap_method_index, cp_size) &&
3487 cp->tag_at(bootstrap_method_index).is_method_handle(),
3488 "bootstrap_method_index %u has bad constant type in class file %s",
3489 bootstrap_method_index,
3490 CHECK);
3491
3492 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3493 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3494 CHECK);
3495
3496 operands->at_put(operand_fill_index++, bootstrap_method_index);
3497 operands->at_put(operand_fill_index++, argument_count);
3498
3499 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3500 for (int j = 0; j < argument_count; j++) {
3501 const u2 argument_index = cfs->get_u2_fast();
3502 check_property(
3503 valid_cp_range(argument_index, cp_size) &&
3504 cp->tag_at(argument_index).is_loadable_constant(),
3505 "argument_index %u has bad constant type in class file %s",
3506 argument_index,
3507 CHECK);
3508 operands->at_put(operand_fill_index++, argument_index);
3509 }
3510 }
3511 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3512 "Bad length on BootstrapMethods in class file %s",
3513 CHECK);
3514 }
3515
3516 bool ClassFileParser::supports_sealed_types() {
3517 return _major_version == JVM_CLASSFILE_MAJOR_VERSION &&
3518 _minor_version == JAVA_PREVIEW_MINOR_VERSION &&
3519 Arguments::enable_preview();
3520 }
3521
3522 bool ClassFileParser::supports_records() {
3523 return _major_version == JVM_CLASSFILE_MAJOR_VERSION &&
3524 _minor_version == JAVA_PREVIEW_MINOR_VERSION &&
3525 Arguments::enable_preview();
3526 }
3527
3528 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3529 ConstantPool* cp,
3530 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3531 TRAPS) {
3532 assert(cfs != NULL, "invariant");
3533 assert(cp != NULL, "invariant");
3534 assert(parsed_annotations != NULL, "invariant");
3535
3536 // Set inner classes attribute to default sentinel
3537 _inner_classes = Universe::the_empty_short_array();
3538 // Set nest members attribute to default sentinel
3539 _nest_members = Universe::the_empty_short_array();
3540 // Set _permitted_subclasses attribute to default sentinel
3541 _permitted_subclasses = Universe::the_empty_short_array();
3542 cfs->guarantee_more(2, CHECK); // attributes_count
3543 u2 attributes_count = cfs->get_u2_fast();
3544 bool parsed_sourcefile_attribute = false;
3545 bool parsed_innerclasses_attribute = false;
3546 bool parsed_nest_members_attribute = false;
3547 bool parsed_permitted_subclasses_attribute = false;
3548 bool parsed_nest_host_attribute = false;
3549 bool parsed_record_attribute = false;
3550 bool parsed_enclosingmethod_attribute = false;
3551 bool parsed_bootstrap_methods_attribute = false;
3552 const u1* runtime_visible_annotations = NULL;
3553 int runtime_visible_annotations_length = 0;
3554 const u1* runtime_invisible_annotations = NULL;
3555 int runtime_invisible_annotations_length = 0;
3556 const u1* runtime_visible_type_annotations = NULL;
3557 int runtime_visible_type_annotations_length = 0;
3558 const u1* runtime_invisible_type_annotations = NULL;
3559 int runtime_invisible_type_annotations_length = 0;
3560 bool runtime_invisible_type_annotations_exists = false;
3561 bool runtime_invisible_annotations_exists = false;
3562 bool parsed_source_debug_ext_annotations_exist = false;
3563 const u1* inner_classes_attribute_start = NULL;
3564 u4 inner_classes_attribute_length = 0;
3565 u2 enclosing_method_class_index = 0;
3566 u2 enclosing_method_method_index = 0;
3567 const u1* nest_members_attribute_start = NULL;
3568 u4 nest_members_attribute_length = 0;
3569 const u1* record_attribute_start = NULL;
3570 u4 record_attribute_length = 0;
3571 const u1* permitted_subclasses_attribute_start = NULL;
3572 u4 permitted_subclasses_attribute_length = 0;
3573
3574 // Iterate over attributes
3575 while (attributes_count--) {
3576 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3577 const u2 attribute_name_index = cfs->get_u2_fast();
3578 const u4 attribute_length = cfs->get_u4_fast();
3579 check_property(
3580 valid_symbol_at(attribute_name_index),
3581 "Attribute name has bad constant pool index %u in class file %s",
3582 attribute_name_index, CHECK);
3583 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3584 if (tag == vmSymbols::tag_source_file()) {
3585 // Check for SourceFile tag
3586 if (_need_verify) {
3587 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3588 }
3589 if (parsed_sourcefile_attribute) {
3590 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3591 } else {
3592 parsed_sourcefile_attribute = true;
3593 }
3594 parse_classfile_sourcefile_attribute(cfs, CHECK);
3595 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3596 // Check for SourceDebugExtension tag
3597 if (parsed_source_debug_ext_annotations_exist) {
3598 classfile_parse_error(
3599 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3600 }
3601 parsed_source_debug_ext_annotations_exist = true;
3602 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3603 } else if (tag == vmSymbols::tag_inner_classes()) {
3604 // Check for InnerClasses tag
3605 if (parsed_innerclasses_attribute) {
3606 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3607 } else {
3608 parsed_innerclasses_attribute = true;
3609 }
3610 inner_classes_attribute_start = cfs->current();
3611 inner_classes_attribute_length = attribute_length;
3612 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3613 } else if (tag == vmSymbols::tag_synthetic()) {
3614 // Check for Synthetic tag
3615 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3616 if (attribute_length != 0) {
3617 classfile_parse_error(
3618 "Invalid Synthetic classfile attribute length %u in class file %s",
3619 attribute_length, CHECK);
3620 }
3621 parse_classfile_synthetic_attribute(CHECK);
3622 } else if (tag == vmSymbols::tag_deprecated()) {
3623 // Check for Deprecatd tag - 4276120
3624 if (attribute_length != 0) {
3625 classfile_parse_error(
3626 "Invalid Deprecated classfile attribute length %u in class file %s",
3627 attribute_length, CHECK);
3628 }
3629 } else if (_major_version >= JAVA_1_5_VERSION) {
3630 if (tag == vmSymbols::tag_signature()) {
3631 if (_generic_signature_index != 0) {
3632 classfile_parse_error(
3633 "Multiple Signature attributes in class file %s", CHECK);
3634 }
3635 if (attribute_length != 2) {
3636 classfile_parse_error(
3637 "Wrong Signature attribute length %u in class file %s",
3638 attribute_length, CHECK);
3639 }
3640 parse_classfile_signature_attribute(cfs, CHECK);
3641 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3642 if (runtime_visible_annotations != NULL) {
3643 classfile_parse_error(
3644 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3645 }
3646 runtime_visible_annotations_length = attribute_length;
3647 runtime_visible_annotations = cfs->current();
3648 assert(runtime_visible_annotations != NULL, "null visible annotations");
3649 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3650 parse_annotations(cp,
3651 runtime_visible_annotations,
3652 runtime_visible_annotations_length,
3653 parsed_annotations,
3654 _loader_data,
3655 _can_access_vm_annotations,
3656 CHECK);
3657 cfs->skip_u1_fast(runtime_visible_annotations_length);
3658 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3659 if (runtime_invisible_annotations_exists) {
3660 classfile_parse_error(
3661 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3662 }
3663 runtime_invisible_annotations_exists = true;
3664 if (PreserveAllAnnotations) {
3665 runtime_invisible_annotations_length = attribute_length;
3666 runtime_invisible_annotations = cfs->current();
3667 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3668 }
3669 cfs->skip_u1(attribute_length, CHECK);
3670 } else if (tag == vmSymbols::tag_enclosing_method()) {
3671 if (parsed_enclosingmethod_attribute) {
3672 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3673 } else {
3674 parsed_enclosingmethod_attribute = true;
3675 }
3676 guarantee_property(attribute_length == 4,
3677 "Wrong EnclosingMethod attribute length %u in class file %s",
3678 attribute_length, CHECK);
3679 cfs->guarantee_more(4, CHECK); // class_index, method_index
3680 enclosing_method_class_index = cfs->get_u2_fast();
3681 enclosing_method_method_index = cfs->get_u2_fast();
3682 if (enclosing_method_class_index == 0) {
3683 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3684 }
3685 // Validate the constant pool indices and types
3686 check_property(valid_klass_reference_at(enclosing_method_class_index),
3687 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3688 if (enclosing_method_method_index != 0 &&
3689 (!cp->is_within_bounds(enclosing_method_method_index) ||
3690 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3691 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3692 }
3693 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3694 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3695 if (parsed_bootstrap_methods_attribute) {
3696 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3697 }
3698 parsed_bootstrap_methods_attribute = true;
3699 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3700 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3701 if (runtime_visible_type_annotations != NULL) {
3702 classfile_parse_error(
3703 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3704 }
3705 runtime_visible_type_annotations_length = attribute_length;
3706 runtime_visible_type_annotations = cfs->current();
3707 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3708 // No need for the VM to parse Type annotations
3709 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3710 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3711 if (runtime_invisible_type_annotations_exists) {
3712 classfile_parse_error(
3713 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3714 } else {
3715 runtime_invisible_type_annotations_exists = true;
3716 }
3717 if (PreserveAllAnnotations) {
3718 runtime_invisible_type_annotations_length = attribute_length;
3719 runtime_invisible_type_annotations = cfs->current();
3720 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3721 }
3722 cfs->skip_u1(attribute_length, CHECK);
3723 } else if (_major_version >= JAVA_11_VERSION) {
3724 if (tag == vmSymbols::tag_nest_members()) {
3725 // Check for NestMembers tag
3726 if (parsed_nest_members_attribute) {
3727 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK);
3728 } else {
3729 parsed_nest_members_attribute = true;
3730 }
3731 if (parsed_nest_host_attribute) {
3732 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK);
3733 }
3734 nest_members_attribute_start = cfs->current();
3735 nest_members_attribute_length = attribute_length;
3736 cfs->skip_u1(nest_members_attribute_length, CHECK);
3737 } else if (tag == vmSymbols::tag_nest_host()) {
3738 if (parsed_nest_host_attribute) {
3739 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK);
3740 } else {
3741 parsed_nest_host_attribute = true;
3742 }
3743 if (parsed_nest_members_attribute) {
3744 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK);
3745 }
3746 if (_need_verify) {
3747 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3748 }
3749 cfs->guarantee_more(2, CHECK);
3750 u2 class_info_index = cfs->get_u2_fast();
3751 check_property(
3752 valid_klass_reference_at(class_info_index),
3753 "Nest-host class_info_index %u has bad constant type in class file %s",
3754 class_info_index, CHECK);
3755 _nest_host = class_info_index;
3756 } else if (_major_version >= JAVA_14_VERSION) {
3757 if (tag == vmSymbols::tag_record()) {
3758 // Skip over Record attribute if not supported or if super class is
3759 // not java.lang.Record.
3760 if (supports_records() &&
3761 cp->klass_name_at(_super_class_index) == vmSymbols::java_lang_Record()) {
3762 if (parsed_record_attribute) {
3763 classfile_parse_error("Multiple Record attributes in class file %s", CHECK);
3764 }
3765 // Check that class is final and not abstract.
3766 if (!_access_flags.is_final() || _access_flags.is_abstract()) {
3767 classfile_parse_error("Record attribute in non-final or abstract class file %s", CHECK);
3768 }
3769 parsed_record_attribute = true;
3770 record_attribute_start = cfs->current();
3771 record_attribute_length = attribute_length;
3772 } else if (log_is_enabled(Info, class, record)) {
3773 // Log why the Record attribute was ignored. Note that if the
3774 // class file version is JVM_CLASSFILE_MAJOR_VERSION.65535 and
3775 // --enable-preview wasn't specified then a java.lang.UnsupportedClassVersionError
3776 // exception would have been thrown.
3777 ResourceMark rm(THREAD);
3778 if (supports_records()) {
3779 log_info(class, record)(
3780 "Ignoring Record attribute in class %s because super type is not java.lang.Record",
3781 _class_name->as_C_string());
3782 } else {
3783 log_info(class, record)(
3784 "Ignoring Record attribute in class %s because class file version is not %d.65535",
3785 _class_name->as_C_string(), JVM_CLASSFILE_MAJOR_VERSION);
3786 }
3787 }
3788 cfs->skip_u1(attribute_length, CHECK);
3789 } else if (_major_version >= JAVA_15_VERSION) {
3790 // Check for PermittedSubclasses tag
3791 if (tag == vmSymbols::tag_permitted_subclasses()) {
3792 if (supports_sealed_types()) {
3793 if (parsed_permitted_subclasses_attribute) {
3794 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3795 }
3796 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3797 if (_access_flags.is_final()) {
3798 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3799 }
3800 parsed_permitted_subclasses_attribute = true;
3801 permitted_subclasses_attribute_start = cfs->current();
3802 permitted_subclasses_attribute_length = attribute_length;
3803 }
3804 cfs->skip_u1(attribute_length, CHECK);
3805 } else {
3806 // Unknown attribute
3807 cfs->skip_u1(attribute_length, CHECK);
3808 }
3809 } else {
3810 // Unknown attribute
3811 cfs->skip_u1(attribute_length, CHECK);
3812 }
3813 } else {
3814 // Unknown attribute
3815 cfs->skip_u1(attribute_length, CHECK);
3816 }
3817 } else {
3818 // Unknown attribute
3819 cfs->skip_u1(attribute_length, CHECK);
3820 }
3821 } else {
3822 // Unknown attribute
3823 cfs->skip_u1(attribute_length, CHECK);
3824 }
3825 }
3826 _class_annotations = assemble_annotations(runtime_visible_annotations,
3827 runtime_visible_annotations_length,
3828 runtime_invisible_annotations,
3829 runtime_invisible_annotations_length,
3830 CHECK);
3831 _class_type_annotations = assemble_annotations(runtime_visible_type_annotations,
3832 runtime_visible_type_annotations_length,
3833 runtime_invisible_type_annotations,
3834 runtime_invisible_type_annotations_length,
3835 CHECK);
3836
3837 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3838 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3839 cfs,
3840 inner_classes_attribute_start,
3841 parsed_innerclasses_attribute,
3842 enclosing_method_class_index,
3843 enclosing_method_method_index,
3844 CHECK);
3845 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3846 guarantee_property(
3847 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3848 "Wrong InnerClasses attribute length in class file %s", CHECK);
3849 }
3850 }
3851
3852 if (parsed_nest_members_attribute) {
3853 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3854 cfs,
3855 nest_members_attribute_start,
3856 CHECK);
3857 if (_need_verify) {
3858 guarantee_property(
3859 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3860 "Wrong NestMembers attribute length in class file %s", CHECK);
3861 }
3862 }
3863
3864 if (parsed_record_attribute) {
3865 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3866 cfs,
3867 cp,
3868 record_attribute_start,
3869 CHECK);
3870 if (_need_verify) {
3871 guarantee_property(record_attribute_length == calculated_attr_length,
3872 "Record attribute has wrong length in class file %s",
3873 CHECK);
3874 }
3875 }
3876
3877 if (parsed_permitted_subclasses_attribute) {
3878 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3879 cfs,
3880 permitted_subclasses_attribute_start,
3881 CHECK);
3882 if (_need_verify) {
3883 guarantee_property(
3884 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3885 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3886 }
3887 }
3888
3889 if (_max_bootstrap_specifier_index >= 0) {
3890 guarantee_property(parsed_bootstrap_methods_attribute,
3891 "Missing BootstrapMethods attribute in class file %s", CHECK);
3892 }
3893 }
3894
3895 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3896 assert(k != NULL, "invariant");
3897
3898 if (_synthetic_flag)
3899 k->set_is_synthetic();
3900 if (_sourcefile_index != 0) {
3901 k->set_source_file_name_index(_sourcefile_index);
3902 }
3903 if (_generic_signature_index != 0) {
3904 k->set_generic_signature_index(_generic_signature_index);
3905 }
3906 if (_sde_buffer != NULL) {
3907 k->set_source_debug_extension(_sde_buffer, _sde_length);
3908 }
3909 }
3910
3911 // Create the Annotations object that will
3912 // hold the annotations array for the Klass.
3913 void ClassFileParser::create_combined_annotations(TRAPS) {
3914 if (_class_annotations == NULL &&
3915 _class_type_annotations == NULL &&
3916 _fields_annotations == NULL &&
3917 _fields_type_annotations == NULL) {
3918 // Don't create the Annotations object unnecessarily.
3919 return;
3920 }
3921
3922 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3923 annotations->set_class_annotations(_class_annotations);
3924 annotations->set_class_type_annotations(_class_type_annotations);
3925 annotations->set_fields_annotations(_fields_annotations);
3926 annotations->set_fields_type_annotations(_fields_type_annotations);
3927
3928 // This is the Annotations object that will be
3929 // assigned to InstanceKlass being constructed.
3930 _combined_annotations = annotations;
3931
3932 // The annotations arrays below has been transfered the
3933 // _combined_annotations so these fields can now be cleared.
3934 _class_annotations = NULL;
3935 _class_type_annotations = NULL;
3936 _fields_annotations = NULL;
3937 _fields_type_annotations = NULL;
3938 }
3939
3940 // Transfer ownership of metadata allocated to the InstanceKlass.
3941 void ClassFileParser::apply_parsed_class_metadata(
3942 InstanceKlass* this_klass,
3943 int java_fields_count,
3944 TRAPS) {
3945 assert(this_klass != NULL, "invariant");
3946
3947 _cp->set_pool_holder(this_klass);
3948 this_klass->set_constants(_cp);
3949 this_klass->set_fields(_fields, java_fields_count);
3950 this_klass->set_methods(_methods);
3951 this_klass->set_inner_classes(_inner_classes);
3952 this_klass->set_nest_members(_nest_members);
3953 this_klass->set_nest_host_index(_nest_host);
3954 this_klass->set_annotations(_combined_annotations);
3955 this_klass->set_permitted_subclasses(_permitted_subclasses);
3956 this_klass->set_record_components(_record_components);
3957 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3958 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3959 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3960 // its _super. If an OOM occurs while loading the current klass, its _super field
3961 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3962 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3963 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3964
3965 // Clear out these fields so they don't get deallocated by the destructor
3966 clear_class_metadata();
3967 }
3968
3969 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3970 int runtime_visible_annotations_length,
3971 const u1* const runtime_invisible_annotations,
3972 int runtime_invisible_annotations_length,
3973 TRAPS) {
3974 AnnotationArray* annotations = NULL;
3975 if (runtime_visible_annotations != NULL ||
3976 runtime_invisible_annotations != NULL) {
3977 annotations = MetadataFactory::new_array<u1>(_loader_data,
3978 runtime_visible_annotations_length +
3979 runtime_invisible_annotations_length,
3980 CHECK_(annotations));
3981 if (runtime_visible_annotations != NULL) {
3982 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3983 annotations->at_put(i, runtime_visible_annotations[i]);
3984 }
3985 }
3986 if (runtime_invisible_annotations != NULL) {
3987 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3988 int append = runtime_visible_annotations_length+i;
3989 annotations->at_put(append, runtime_invisible_annotations[i]);
3990 }
3991 }
3992 }
3993 return annotations;
3994 }
3995
3996 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3997 const int super_class_index,
3998 const bool need_verify,
3999 TRAPS) {
4000 assert(cp != NULL, "invariant");
4001 const InstanceKlass* super_klass = NULL;
4002
4003 if (super_class_index == 0) {
4004 check_property(_class_name == vmSymbols::java_lang_Object(),
4005 "Invalid superclass index %u in class file %s",
4006 super_class_index,
4007 CHECK_NULL);
4008 } else {
4009 check_property(valid_klass_reference_at(super_class_index),
4010 "Invalid superclass index %u in class file %s",
4011 super_class_index,
4012 CHECK_NULL);
4013 // The class name should be legal because it is checked when parsing constant pool.
4014 // However, make sure it is not an array type.
4015 bool is_array = false;
4016 if (cp->tag_at(super_class_index).is_klass()) {
4017 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
4018 if (need_verify)
4019 is_array = super_klass->is_array_klass();
4020 } else if (need_verify) {
4021 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
4022 }
4023 if (need_verify) {
4024 guarantee_property(!is_array,
4025 "Bad superclass name in class file %s", CHECK_NULL);
4026 }
4027 }
4028 return super_klass;
4029 }
4030
4031 #ifndef PRODUCT
4032 static void print_field_layout(const Symbol* name,
4033 Array<u2>* fields,
4034 ConstantPool* cp,
4035 int instance_size,
4036 int instance_fields_start,
4037 int instance_fields_end,
4038 int static_fields_end) {
4039
4040 assert(name != NULL, "invariant");
4041
4042 tty->print("%s: field layout\n", name->as_klass_external_name());
4043 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4044 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4045 if (!fs.access_flags().is_static()) {
4046 tty->print(" @%3d \"%s\" %s\n",
4047 fs.offset(),
4048 fs.name()->as_klass_external_name(),
4049 fs.signature()->as_klass_external_name());
4050 }
4051 }
4052 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4053 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4054 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4055 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4056 if (fs.access_flags().is_static()) {
4057 tty->print(" @%3d \"%s\" %s\n",
4058 fs.offset(),
4059 fs.name()->as_klass_external_name(),
4060 fs.signature()->as_klass_external_name());
4061 }
4062 }
4063 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4064 tty->print("\n");
4065 }
4066 #endif
4067
4068 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
4069 _max_nonstatic_oop_maps = max_blocks;
4070 _nonstatic_oop_map_count = 0;
4071 if (max_blocks == 0) {
4072 _nonstatic_oop_maps = NULL;
4073 } else {
4074 _nonstatic_oop_maps =
4075 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
4076 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
4077 }
4078 }
4079
4080 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
4081 assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
4082 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
4083 }
4084
4085 // addition of super oop maps
4086 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
4087 assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
4088 nof_blocks <= _max_nonstatic_oop_maps, "invariant");
4089
4090 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
4091 _nonstatic_oop_map_count += nof_blocks;
4092 }
4093
4094 // collection of oops
4095 void OopMapBlocksBuilder::add(int offset, int count) {
4096 if (_nonstatic_oop_map_count == 0) {
4097 _nonstatic_oop_map_count++;
4098 }
4099 OopMapBlock* nonstatic_oop_map = last_oop_map();
4100 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
4101 nonstatic_oop_map->set_offset(offset);
4102 nonstatic_oop_map->set_count(count);
4103 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
4104 nonstatic_oop_map->increment_count(count);
4105 } else { // Need a new one...
4106 _nonstatic_oop_map_count++;
4107 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
4108 nonstatic_oop_map = last_oop_map();
4109 nonstatic_oop_map->set_offset(offset);
4110 nonstatic_oop_map->set_count(count);
4111 }
4112 }
4113
4114 // general purpose copy, e.g. into allocated instanceKlass
4115 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
4116 if (_nonstatic_oop_map_count != 0) {
4117 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
4118 }
4119 }
4120
4121 // Sort and compact adjacent blocks
4122 void OopMapBlocksBuilder::compact() {
4123 if (_nonstatic_oop_map_count <= 1) {
4124 return;
4125 }
4126 /*
4127 * Since field layout sneeks in oops before values, we will be able to condense
4128 * blocks. There is potential to compact between super, own refs and values
4129 * containing refs.
4130 *
4131 * Currently compaction is slightly limited due to values being 8 byte aligned.
4132 * This may well change: FixMe if it doesn't, the code below is fairly general purpose
4133 * and maybe it doesn't need to be.
4134 */
4135 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
4136 (_sort_Fn)OopMapBlock::compare_offset);
4137 if (_nonstatic_oop_map_count < 2) {
4138 return;
4139 }
4140
4141 // Make a temp copy, and iterate through and copy back into the original
4142 ResourceMark rm;
4143 OopMapBlock* oop_maps_copy =
4144 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
4145 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
4146 copy(oop_maps_copy);
4147 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
4148 unsigned int new_count = 1;
4149 oop_maps_copy++;
4150 while(oop_maps_copy < oop_maps_copy_end) {
4151 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4152 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4153 nonstatic_oop_map->increment_count(oop_maps_copy->count());
4154 } else {
4155 nonstatic_oop_map++;
4156 new_count++;
4157 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4158 nonstatic_oop_map->set_count(oop_maps_copy->count());
4159 }
4160 oop_maps_copy++;
4161 }
4162 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
4163 _nonstatic_oop_map_count = new_count;
4164 }
4165
4166 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4167 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4168 if (_nonstatic_oop_map_count > 0) {
4169 OopMapBlock* map = _nonstatic_oop_maps;
4170 OopMapBlock* last_map = last_oop_map();
4171 assert(map <= last_map, "Last less than first");
4172 while (map <= last_map) {
4173 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4174 map->offset() + map->offset_span() - heapOopSize, map->count());
4175 map++;
4176 }
4177 }
4178 }
4179
4180 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4181 print_on(st);
4182 }
4183
4184 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
4185 void ClassFileParser::layout_fields(ConstantPool* cp,
4186 const FieldAllocationCount* fac,
4187 const ClassAnnotationCollector* parsed_annotations,
4188 FieldLayoutInfo* info,
4189 TRAPS) {
4190
4191 assert(cp != NULL, "invariant");
4192
4193 // Field size and offset computation
4194 int nonstatic_field_size = _super_klass == NULL ? 0 :
4195 _super_klass->nonstatic_field_size();
4196
4197 // Count the contended fields by type.
4198 //
4199 // We ignore static fields, because @Contended is not supported for them.
4200 // The layout code below will also ignore the static fields.
4201 int nonstatic_contended_count = 0;
4202 FieldAllocationCount fac_contended;
4203 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4204 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4205 if (fs.is_contended()) {
4206 fac_contended.count[atype]++;
4207 if (!fs.access_flags().is_static()) {
4208 nonstatic_contended_count++;
4209 }
4210 }
4211 }
4212
4213
4214 // Calculate the starting byte offsets
4215 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
4216 int next_static_double_offset = next_static_oop_offset +
4217 ((fac->count[STATIC_OOP]) * heapOopSize);
4218 if (fac->count[STATIC_DOUBLE]) {
4219 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
4220 }
4221
4222 int next_static_word_offset = next_static_double_offset +
4223 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
4224 int next_static_short_offset = next_static_word_offset +
4225 ((fac->count[STATIC_WORD]) * BytesPerInt);
4226 int next_static_byte_offset = next_static_short_offset +
4227 ((fac->count[STATIC_SHORT]) * BytesPerShort);
4228
4229 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
4230 nonstatic_field_size * heapOopSize;
4231
4232 int next_nonstatic_field_offset = nonstatic_fields_start;
4233
4234 const bool is_contended_class = parsed_annotations->is_contended();
4235
4236 // Class is contended, pad before all the fields
4237 if (is_contended_class) {
4238 next_nonstatic_field_offset += ContendedPaddingWidth;
4239 }
4240
4241 // Compute the non-contended fields count.
4242 // The packing code below relies on these counts to determine if some field
4243 // can be squeezed into the alignment gap. Contended fields are obviously
4244 // exempt from that.
4245 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
4246 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
4247 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
4248 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
4249 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
4250
4251 // Total non-static fields count, including every contended field
4252 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
4253 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
4254 fac->count[NONSTATIC_OOP];
4255
4256 const bool super_has_nonstatic_fields =
4257 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
4258 const bool has_nonstatic_fields =
4259 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
4260
4261
4262 // Prepare list of oops for oop map generation.
4263 //
4264 // "offset" and "count" lists are describing the set of contiguous oop
4265 // regions. offset[i] is the start of the i-th region, which then has
4266 // count[i] oops following. Before we know how many regions are required,
4267 // we pessimistically allocate the maps to fit all the oops into the
4268 // distinct regions.
4269
4270 int super_oop_map_count = (_super_klass == NULL) ? 0 :_super_klass->nonstatic_oop_map_count();
4271 int max_oop_map_count = super_oop_map_count + fac->count[NONSTATIC_OOP];
4272
4273 OopMapBlocksBuilder* nonstatic_oop_maps = new OopMapBlocksBuilder(max_oop_map_count);
4274 if (super_oop_map_count > 0) {
4275 nonstatic_oop_maps->initialize_inherited_blocks(_super_klass->start_of_nonstatic_oop_maps(),
4276 _super_klass->nonstatic_oop_map_count());
4277 }
4278
4279 int first_nonstatic_oop_offset = 0; // will be set for first oop field
4280
4281 bool compact_fields = true;
4282 bool allocate_oops_first = false;
4283
4284 int next_nonstatic_oop_offset = 0;
4285 int next_nonstatic_double_offset = 0;
4286
4287 // Rearrange fields for a given allocation style
4288 if (allocate_oops_first) {
4289 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
4290 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4291 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4292 (nonstatic_oop_count * heapOopSize);
4293 } else {
4294 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
4295 next_nonstatic_double_offset = next_nonstatic_field_offset;
4296 }
4297
4298 int nonstatic_oop_space_count = 0;
4299 int nonstatic_word_space_count = 0;
4300 int nonstatic_short_space_count = 0;
4301 int nonstatic_byte_space_count = 0;
4302 int nonstatic_oop_space_offset = 0;
4303 int nonstatic_word_space_offset = 0;
4304 int nonstatic_short_space_offset = 0;
4305 int nonstatic_byte_space_offset = 0;
4306
4307 // Try to squeeze some of the fields into the gaps due to
4308 // long/double alignment.
4309 if (nonstatic_double_count > 0) {
4310 int offset = next_nonstatic_double_offset;
4311 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
4312 if (compact_fields && offset != next_nonstatic_double_offset) {
4313 // Allocate available fields into the gap before double field.
4314 int length = next_nonstatic_double_offset - offset;
4315 assert(length == BytesPerInt, "");
4316 nonstatic_word_space_offset = offset;
4317 if (nonstatic_word_count > 0) {
4318 nonstatic_word_count -= 1;
4319 nonstatic_word_space_count = 1; // Only one will fit
4320 length -= BytesPerInt;
4321 offset += BytesPerInt;
4322 }
4323 nonstatic_short_space_offset = offset;
4324 while (length >= BytesPerShort && nonstatic_short_count > 0) {
4325 nonstatic_short_count -= 1;
4326 nonstatic_short_space_count += 1;
4327 length -= BytesPerShort;
4328 offset += BytesPerShort;
4329 }
4330 nonstatic_byte_space_offset = offset;
4331 while (length > 0 && nonstatic_byte_count > 0) {
4332 nonstatic_byte_count -= 1;
4333 nonstatic_byte_space_count += 1;
4334 length -= 1;
4335 }
4336 // Allocate oop field in the gap if there are no other fields for that.
4337 nonstatic_oop_space_offset = offset;
4338 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
4339 !allocate_oops_first) { // when oop fields not first
4340 nonstatic_oop_count -= 1;
4341 nonstatic_oop_space_count = 1; // Only one will fit
4342 length -= heapOopSize;
4343 offset += heapOopSize;
4344 }
4345 }
4346 }
4347
4348 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4349 (nonstatic_double_count * BytesPerLong);
4350 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4351 (nonstatic_word_count * BytesPerInt);
4352 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4353 (nonstatic_short_count * BytesPerShort);
4354 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4355 nonstatic_byte_count;
4356
4357 // let oops jump before padding with this allocation style
4358 if (!allocate_oops_first) {
4359 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4360 if( nonstatic_oop_count > 0 ) {
4361 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4362 }
4363 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4364 }
4365
4366 // Iterate over fields again and compute correct offsets.
4367 // The field allocation type was temporarily stored in the offset slot.
4368 // oop fields are located before non-oop fields (static and non-static).
4369 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4370
4371 // skip already laid out fields
4372 if (fs.is_offset_set()) continue;
4373
4374 // contended instance fields are handled below
4375 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4376
4377 int real_offset = 0;
4378 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4379
4380 // pack the rest of the fields
4381 switch (atype) {
4382 case STATIC_OOP:
4383 real_offset = next_static_oop_offset;
4384 next_static_oop_offset += heapOopSize;
4385 break;
4386 case STATIC_BYTE:
4387 real_offset = next_static_byte_offset;
4388 next_static_byte_offset += 1;
4389 break;
4390 case STATIC_SHORT:
4391 real_offset = next_static_short_offset;
4392 next_static_short_offset += BytesPerShort;
4393 break;
4394 case STATIC_WORD:
4395 real_offset = next_static_word_offset;
4396 next_static_word_offset += BytesPerInt;
4397 break;
4398 case STATIC_DOUBLE:
4399 real_offset = next_static_double_offset;
4400 next_static_double_offset += BytesPerLong;
4401 break;
4402 case NONSTATIC_OOP:
4403 if( nonstatic_oop_space_count > 0 ) {
4404 real_offset = nonstatic_oop_space_offset;
4405 nonstatic_oop_space_offset += heapOopSize;
4406 nonstatic_oop_space_count -= 1;
4407 } else {
4408 real_offset = next_nonstatic_oop_offset;
4409 next_nonstatic_oop_offset += heapOopSize;
4410 }
4411 nonstatic_oop_maps->add(real_offset, 1);
4412 break;
4413 case NONSTATIC_BYTE:
4414 if( nonstatic_byte_space_count > 0 ) {
4415 real_offset = nonstatic_byte_space_offset;
4416 nonstatic_byte_space_offset += 1;
4417 nonstatic_byte_space_count -= 1;
4418 } else {
4419 real_offset = next_nonstatic_byte_offset;
4420 next_nonstatic_byte_offset += 1;
4421 }
4422 break;
4423 case NONSTATIC_SHORT:
4424 if( nonstatic_short_space_count > 0 ) {
4425 real_offset = nonstatic_short_space_offset;
4426 nonstatic_short_space_offset += BytesPerShort;
4427 nonstatic_short_space_count -= 1;
4428 } else {
4429 real_offset = next_nonstatic_short_offset;
4430 next_nonstatic_short_offset += BytesPerShort;
4431 }
4432 break;
4433 case NONSTATIC_WORD:
4434 if( nonstatic_word_space_count > 0 ) {
4435 real_offset = nonstatic_word_space_offset;
4436 nonstatic_word_space_offset += BytesPerInt;
4437 nonstatic_word_space_count -= 1;
4438 } else {
4439 real_offset = next_nonstatic_word_offset;
4440 next_nonstatic_word_offset += BytesPerInt;
4441 }
4442 break;
4443 case NONSTATIC_DOUBLE:
4444 real_offset = next_nonstatic_double_offset;
4445 next_nonstatic_double_offset += BytesPerLong;
4446 break;
4447 default:
4448 ShouldNotReachHere();
4449 }
4450 fs.set_offset(real_offset);
4451 }
4452
4453
4454 // Handle the contended cases.
4455 //
4456 // Each contended field should not intersect the cache line with another contended field.
4457 // In the absence of alignment information, we end up with pessimistically separating
4458 // the fields with full-width padding.
4459 //
4460 // Additionally, this should not break alignment for the fields, so we round the alignment up
4461 // for each field.
4462 if (nonstatic_contended_count > 0) {
4463
4464 // if there is at least one contended field, we need to have pre-padding for them
4465 next_nonstatic_padded_offset += ContendedPaddingWidth;
4466
4467 // collect all contended groups
4468 ResourceBitMap bm(cp->size());
4469 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4470 // skip already laid out fields
4471 if (fs.is_offset_set()) continue;
4472
4473 if (fs.is_contended()) {
4474 bm.set_bit(fs.contended_group());
4475 }
4476 }
4477
4478 int current_group = -1;
4479 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4480
4481 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4482
4483 // skip already laid out fields
4484 if (fs.is_offset_set()) continue;
4485
4486 // skip non-contended fields and fields from different group
4487 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4488
4489 // handle statics below
4490 if (fs.access_flags().is_static()) continue;
4491
4492 int real_offset = 0;
4493 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4494
4495 switch (atype) {
4496 case NONSTATIC_BYTE:
4497 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4498 real_offset = next_nonstatic_padded_offset;
4499 next_nonstatic_padded_offset += 1;
4500 break;
4501
4502 case NONSTATIC_SHORT:
4503 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4504 real_offset = next_nonstatic_padded_offset;
4505 next_nonstatic_padded_offset += BytesPerShort;
4506 break;
4507
4508 case NONSTATIC_WORD:
4509 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4510 real_offset = next_nonstatic_padded_offset;
4511 next_nonstatic_padded_offset += BytesPerInt;
4512 break;
4513
4514 case NONSTATIC_DOUBLE:
4515 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4516 real_offset = next_nonstatic_padded_offset;
4517 next_nonstatic_padded_offset += BytesPerLong;
4518 break;
4519
4520 case NONSTATIC_OOP:
4521 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4522 real_offset = next_nonstatic_padded_offset;
4523 next_nonstatic_padded_offset += heapOopSize;
4524 nonstatic_oop_maps->add(real_offset, 1);
4525 break;
4526
4527 default:
4528 ShouldNotReachHere();
4529 }
4530
4531 if (fs.contended_group() == 0) {
4532 // Contended group defines the equivalence class over the fields:
4533 // the fields within the same contended group are not inter-padded.
4534 // The only exception is default group, which does not incur the
4535 // equivalence, and so requires intra-padding.
4536 next_nonstatic_padded_offset += ContendedPaddingWidth;
4537 }
4538
4539 fs.set_offset(real_offset);
4540 } // for
4541
4542 // Start laying out the next group.
4543 // Note that this will effectively pad the last group in the back;
4544 // this is expected to alleviate memory contention effects for
4545 // subclass fields and/or adjacent object.
4546 // If this was the default group, the padding is already in place.
4547 if (current_group != 0) {
4548 next_nonstatic_padded_offset += ContendedPaddingWidth;
4549 }
4550 }
4551
4552 // handle static fields
4553 }
4554
4555 // Entire class is contended, pad in the back.
4556 // This helps to alleviate memory contention effects for subclass fields
4557 // and/or adjacent object.
4558 if (is_contended_class) {
4559 next_nonstatic_padded_offset += ContendedPaddingWidth;
4560 }
4561
4562 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4563
4564 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize);
4565 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4566 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4567
4568 int static_field_size = (static_fields_end -
4569 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4570 nonstatic_field_size = nonstatic_field_size +
4571 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4572
4573 int instance_size = align_object_size(instance_end / wordSize);
4574
4575 assert(instance_size == align_object_size(align_up(
4576 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
4577 wordSize) / wordSize), "consistent layout helper value");
4578
4579 // Invariant: nonstatic_field end/start should only change if there are
4580 // nonstatic fields in the class, or if the class is contended. We compare
4581 // against the non-aligned value, so that end alignment will not fail the
4582 // assert without actually having the fields.
4583 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4584 is_contended_class ||
4585 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4586
4587 // Number of non-static oop map blocks allocated at end of klass.
4588 nonstatic_oop_maps->compact();
4589
4590 #ifndef PRODUCT
4591 if (PrintFieldLayout) {
4592 print_field_layout(_class_name,
4593 _fields,
4594 cp,
4595 instance_size,
4596 nonstatic_fields_start,
4597 nonstatic_fields_end,
4598 static_fields_end);
4599 }
4600
4601 #endif
4602 // Pass back information needed for InstanceKlass creation
4603 info->oop_map_blocks = nonstatic_oop_maps;
4604 info->_instance_size = instance_size;
4605 info->_static_field_size = static_field_size;
4606 info->_nonstatic_field_size = nonstatic_field_size;
4607 info->_has_nonstatic_fields = has_nonstatic_fields;
4608 }
4609
4610 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4611 assert(ik != NULL, "invariant");
4612
4613 const Klass* const super = ik->super();
4614
4615 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4616 // in which case we don't have to register objects as finalizable
4617 if (!_has_empty_finalizer) {
4618 if (_has_finalizer ||
4619 (super != NULL && super->has_finalizer())) {
4620 ik->set_has_finalizer();
4621 }
4622 }
4623
4624 #ifdef ASSERT
4625 bool f = false;
4626 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4627 vmSymbols::void_method_signature());
4628 if (m != NULL && !m->is_empty_method()) {
4629 f = true;
4630 }
4631
4632 // Spec doesn't prevent agent from redefinition of empty finalizer.
4633 // Despite the fact that it's generally bad idea and redefined finalizer
4634 // will not work as expected we shouldn't abort vm in this case
4635 if (!ik->has_redefined_this_or_super()) {
4636 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4637 }
4638 #endif
4639
4640 // Check if this klass supports the java.lang.Cloneable interface
4641 if (SystemDictionary::Cloneable_klass_loaded()) {
4642 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4643 ik->set_is_cloneable();
4644 }
4645 }
4646
4647 // Check if this klass has a vanilla default constructor
4648 if (super == NULL) {
4649 // java.lang.Object has empty default constructor
4650 ik->set_has_vanilla_constructor();
4651 } else {
4652 if (super->has_vanilla_constructor() &&
4653 _has_vanilla_constructor) {
4654 ik->set_has_vanilla_constructor();
4655 }
4656 #ifdef ASSERT
4657 bool v = false;
4658 if (super->has_vanilla_constructor()) {
4659 const Method* const constructor =
4660 ik->find_method(vmSymbols::object_initializer_name(),
4661 vmSymbols::void_method_signature());
4662 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4663 v = true;
4664 }
4665 }
4666 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4667 #endif
4668 }
4669
4670 // If it cannot be fast-path allocated, set a bit in the layout helper.
4671 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4672 assert(ik->size_helper() > 0, "layout_helper is initialized");
4673 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4674 || ik->is_abstract() || ik->is_interface()
4675 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4676 || ik->size_helper() >= FastAllocateSizeLimit) {
4677 // Forbid fast-path allocation.
4678 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4679 ik->set_layout_helper(lh);
4680 }
4681 }
4682
4683 // utility methods for appending an array with check for duplicates
4684
4685 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4686 const Array<InstanceKlass*>* const ifs) {
4687 // iterate over new interfaces
4688 for (int i = 0; i < ifs->length(); i++) {
4689 InstanceKlass* const e = ifs->at(i);
4690 assert(e->is_klass() && e->is_interface(), "just checking");
4691 // add new interface
4692 result->append_if_missing(e);
4693 }
4694 }
4695
4696 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4697 Array<InstanceKlass*>* local_ifs,
4698 ClassLoaderData* loader_data,
4699 TRAPS) {
4700 assert(local_ifs != NULL, "invariant");
4701 assert(loader_data != NULL, "invariant");
4702
4703 // Compute maximum size for transitive interfaces
4704 int max_transitive_size = 0;
4705 int super_size = 0;
4706 // Add superclass transitive interfaces size
4707 if (super != NULL) {
4708 super_size = super->transitive_interfaces()->length();
4709 max_transitive_size += super_size;
4710 }
4711 // Add local interfaces' super interfaces
4712 const int local_size = local_ifs->length();
4713 for (int i = 0; i < local_size; i++) {
4714 InstanceKlass* const l = local_ifs->at(i);
4715 max_transitive_size += l->transitive_interfaces()->length();
4716 }
4717 // Finally add local interfaces
4718 max_transitive_size += local_size;
4719 // Construct array
4720 if (max_transitive_size == 0) {
4721 // no interfaces, use canonicalized array
4722 return Universe::the_empty_instance_klass_array();
4723 } else if (max_transitive_size == super_size) {
4724 // no new local interfaces added, share superklass' transitive interface array
4725 return super->transitive_interfaces();
4726 } else if (max_transitive_size == local_size) {
4727 // only local interfaces added, share local interface array
4728 return local_ifs;
4729 } else {
4730 ResourceMark rm;
4731 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4732
4733 // Copy down from superclass
4734 if (super != NULL) {
4735 append_interfaces(result, super->transitive_interfaces());
4736 }
4737
4738 // Copy down from local interfaces' superinterfaces
4739 for (int i = 0; i < local_size; i++) {
4740 InstanceKlass* const l = local_ifs->at(i);
4741 append_interfaces(result, l->transitive_interfaces());
4742 }
4743 // Finally add local interfaces
4744 append_interfaces(result, local_ifs);
4745
4746 // length will be less than the max_transitive_size if duplicates were removed
4747 const int length = result->length();
4748 assert(length <= max_transitive_size, "just checking");
4749 Array<InstanceKlass*>* const new_result =
4750 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4751 for (int i = 0; i < length; i++) {
4752 InstanceKlass* const e = result->at(i);
4753 assert(e != NULL, "just checking");
4754 new_result->at_put(i, e);
4755 }
4756 return new_result;
4757 }
4758 }
4759
4760 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4761 assert(this_klass != NULL, "invariant");
4762 const Klass* const super = this_klass->super();
4763
4764 if (super != NULL) {
4765 const InstanceKlass* super_ik = InstanceKlass::cast(super);
4766
4767 if (super->is_final()) {
4768 ResourceMark rm(THREAD);
4769 Exceptions::fthrow(
4770 THREAD_AND_LOCATION,
4771 vmSymbols::java_lang_VerifyError(),
4772 "class %s cannot inherit from final class %s",
4773 this_klass->external_name(),
4774 super_ik->external_name());
4775 return;
4776 }
4777
4778 if (super_ik->is_sealed() && !super_ik->has_as_permitted_subclass(this_klass)) {
4779 ResourceMark rm(THREAD);
4780 Exceptions::fthrow(
4781 THREAD_AND_LOCATION,
4782 vmSymbols::java_lang_IncompatibleClassChangeError(),
4783 "class %s cannot inherit from sealed class %s",
4784 this_klass->external_name(),
4785 super_ik->external_name());
4786 return;
4787 }
4788
4789 // If the loader is not the boot loader then throw an exception if its
4790 // superclass is in package jdk.internal.reflect and its loader is not a
4791 // special reflection class loader
4792 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4793 PackageEntry* super_package = super->package();
4794 if (super_package != NULL &&
4795 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4796 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4797 ResourceMark rm(THREAD);
4798 Exceptions::fthrow(
4799 THREAD_AND_LOCATION,
4800 vmSymbols::java_lang_IllegalAccessError(),
4801 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4802 this_klass->external_name(),
4803 this_klass->class_loader_data()->loader_name_and_id(),
4804 super->external_name());
4805 return;
4806 }
4807 }
4808
4809 Reflection::VerifyClassAccessResults vca_result =
4810 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4811 if (vca_result != Reflection::ACCESS_OK) {
4812 ResourceMark rm(THREAD);
4813 char* msg = Reflection::verify_class_access_msg(this_klass,
4814 InstanceKlass::cast(super),
4815 vca_result);
4816 if (msg == NULL) {
4817 bool same_module = (this_klass->module() == super->module());
4818 Exceptions::fthrow(
4819 THREAD_AND_LOCATION,
4820 vmSymbols::java_lang_IllegalAccessError(),
4821 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4822 this_klass->external_name(),
4823 super->is_abstract() ? "abstract " : "",
4824 super->external_name(),
4825 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4826 (same_module) ? "" : "; ",
4827 (same_module) ? "" : super->class_in_module_of_loader());
4828 } else {
4829 // Add additional message content.
4830 Exceptions::fthrow(
4831 THREAD_AND_LOCATION,
4832 vmSymbols::java_lang_IllegalAccessError(),
4833 "superclass access check failed: %s",
4834 msg);
4835 }
4836 }
4837 }
4838 }
4839
4840
4841 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4842 assert(this_klass != NULL, "invariant");
4843 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4844 const int lng = local_interfaces->length();
4845 for (int i = lng - 1; i >= 0; i--) {
4846 InstanceKlass* const k = local_interfaces->at(i);
4847 assert (k != NULL && k->is_interface(), "invalid interface");
4848
4849 if (k->is_sealed() && !k->has_as_permitted_subclass(this_klass)) {
4850 ResourceMark rm(THREAD);
4851 Exceptions::fthrow(
4852 THREAD_AND_LOCATION,
4853 vmSymbols::java_lang_IncompatibleClassChangeError(),
4854 "class %s cannot %s sealed interface %s",
4855 this_klass->external_name(),
4856 this_klass->is_interface() ? "extend" : "implement",
4857 k->external_name());
4858 return;
4859 }
4860
4861 Reflection::VerifyClassAccessResults vca_result =
4862 Reflection::verify_class_access(this_klass, k, false);
4863 if (vca_result != Reflection::ACCESS_OK) {
4864 ResourceMark rm(THREAD);
4865 char* msg = Reflection::verify_class_access_msg(this_klass,
4866 k,
4867 vca_result);
4868 if (msg == NULL) {
4869 bool same_module = (this_klass->module() == k->module());
4870 Exceptions::fthrow(
4871 THREAD_AND_LOCATION,
4872 vmSymbols::java_lang_IllegalAccessError(),
4873 "class %s cannot access its superinterface %s (%s%s%s)",
4874 this_klass->external_name(),
4875 k->external_name(),
4876 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4877 (same_module) ? "" : "; ",
4878 (same_module) ? "" : k->class_in_module_of_loader());
4879 } else {
4880 // Add additional message content.
4881 Exceptions::fthrow(
4882 THREAD_AND_LOCATION,
4883 vmSymbols::java_lang_IllegalAccessError(),
4884 "superinterface check failed: %s",
4885 msg);
4886 }
4887 }
4888 }
4889 }
4890
4891
4892 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4893 assert(this_klass != NULL, "invariant");
4894 const Array<Method*>* const methods = this_klass->methods();
4895 const int num_methods = methods->length();
4896
4897 // go thru each method and check if it overrides a final method
4898 for (int index = 0; index < num_methods; index++) {
4899 const Method* const m = methods->at(index);
4900
4901 // skip private, static, and <init> methods
4902 if ((!m->is_private() && !m->is_static()) &&
4903 (m->name() != vmSymbols::object_initializer_name())) {
4904
4905 const Symbol* const name = m->name();
4906 const Symbol* const signature = m->signature();
4907 const Klass* k = this_klass->super();
4908 const Method* super_m = NULL;
4909 while (k != NULL) {
4910 // skip supers that don't have final methods.
4911 if (k->has_final_method()) {
4912 // lookup a matching method in the super class hierarchy
4913 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4914 if (super_m == NULL) {
4915 break; // didn't find any match; get out
4916 }
4917
4918 if (super_m->is_final() && !super_m->is_static() &&
4919 !super_m->access_flags().is_private()) {
4920 // matching method in super is final, and not static or private
4921 bool can_access = Reflection::verify_member_access(this_klass,
4922 super_m->method_holder(),
4923 super_m->method_holder(),
4924 super_m->access_flags(),
4925 false, false, CHECK);
4926 if (can_access) {
4927 // this class can access super final method and therefore override
4928 ResourceMark rm(THREAD);
4929 Exceptions::fthrow(THREAD_AND_LOCATION,
4930 vmSymbols::java_lang_VerifyError(),
4931 "class %s overrides final method %s.%s%s",
4932 this_klass->external_name(),
4933 super_m->method_holder()->external_name(),
4934 name->as_C_string(),
4935 signature->as_C_string()
4936 );
4937 return;
4938 }
4939 }
4940
4941 // continue to look from super_m's holder's super.
4942 k = super_m->method_holder()->super();
4943 continue;
4944 }
4945
4946 k = k->super();
4947 }
4948 }
4949 }
4950 }
4951
4952
4953 // assumes that this_klass is an interface
4954 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4955 assert(this_klass != NULL, "invariant");
4956 assert(this_klass->is_interface(), "not an interface");
4957 const Array<Method*>* methods = this_klass->methods();
4958 const int num_methods = methods->length();
4959
4960 for (int index = 0; index < num_methods; index++) {
4961 const Method* const m = methods->at(index);
4962 // if m is static and not the init method, throw a verify error
4963 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4964 ResourceMark rm(THREAD);
4965 Exceptions::fthrow(
4966 THREAD_AND_LOCATION,
4967 vmSymbols::java_lang_VerifyError(),
4968 "Illegal static method %s in interface %s",
4969 m->name()->as_C_string(),
4970 this_klass->external_name()
4971 );
4972 return;
4973 }
4974 }
4975 }
4976
4977 // utility methods for format checking
4978
4979 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4980 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4981 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4982 if (is_module) {
4983 ResourceMark rm(THREAD);
4984 Exceptions::fthrow(
4985 THREAD_AND_LOCATION,
4986 vmSymbols::java_lang_NoClassDefFoundError(),
4987 "%s is not a class because access_flag ACC_MODULE is set",
4988 _class_name->as_C_string());
4989 return;
4990 }
4991
4992 if (!_need_verify) { return; }
4993
4994 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4995 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4996 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4997 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4998 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4999 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
5000 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
5001 const bool major_gte_14 = _major_version >= JAVA_14_VERSION;
5002
5003 if ((is_abstract && is_final) ||
5004 (is_interface && !is_abstract) ||
5005 (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
5006 (!is_interface && major_gte_1_5 && is_annotation)) {
5007 ResourceMark rm(THREAD);
5008 Exceptions::fthrow(
5009 THREAD_AND_LOCATION,
5010 vmSymbols::java_lang_ClassFormatError(),
5011 "Illegal class modifiers in class %s: 0x%X",
5012 _class_name->as_C_string(), flags
5013 );
5014 return;
5015 }
5016 }
5017
5018 static bool has_illegal_visibility(jint flags) {
5019 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5020 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5021 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5022
5023 return ((is_public && is_protected) ||
5024 (is_public && is_private) ||
5025 (is_protected && is_private));
5026 }
5027
5028 // A legal major_version.minor_version must be one of the following:
5029 //
5030 // Major_version >= 45 and major_version < 56, any minor_version.
5031 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
5032 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
5033 //
5034 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
5035 ResourceMark rm(THREAD);
5036 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
5037 if (major < JAVA_MIN_SUPPORTED_VERSION) {
5038 Exceptions::fthrow(
5039 THREAD_AND_LOCATION,
5040 vmSymbols::java_lang_UnsupportedClassVersionError(),
5041 "%s (class file version %u.%u) was compiled with an invalid major version",
5042 class_name->as_C_string(), major, minor);
5043 return;
5044 }
5045
5046 if (major > max_version) {
5047 Exceptions::fthrow(
5048 THREAD_AND_LOCATION,
5049 vmSymbols::java_lang_UnsupportedClassVersionError(),
5050 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5051 "this version of the Java Runtime only recognizes class file versions up to %u.0",
5052 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
5053 return;
5054 }
5055
5056 if (major < JAVA_12_VERSION || minor == 0) {
5057 return;
5058 }
5059
5060 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
5061 if (major != max_version) {
5062 Exceptions::fthrow(
5063 THREAD_AND_LOCATION,
5064 vmSymbols::java_lang_UnsupportedClassVersionError(),
5065 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
5066 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
5067 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
5068 return;
5069 }
5070
5071 if (!Arguments::enable_preview()) {
5072 Exceptions::fthrow(
5073 THREAD_AND_LOCATION,
5074 vmSymbols::java_lang_UnsupportedClassVersionError(),
5075 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
5076 class_name->as_C_string(), major, minor);
5077 return;
5078 }
5079
5080 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
5081 Exceptions::fthrow(
5082 THREAD_AND_LOCATION,
5083 vmSymbols::java_lang_UnsupportedClassVersionError(),
5084 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
5085 class_name->as_C_string(), major, minor);
5086 }
5087 }
5088
5089 void ClassFileParser::verify_legal_field_modifiers(jint flags,
5090 bool is_interface,
5091 TRAPS) const {
5092 if (!_need_verify) { return; }
5093
5094 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5095 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5096 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5097 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5098 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5099 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
5100 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
5101 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5102 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
5103
5104 bool is_illegal = false;
5105
5106 if (is_interface) {
5107 if (!is_public || !is_static || !is_final || is_private ||
5108 is_protected || is_volatile || is_transient ||
5109 (major_gte_1_5 && is_enum)) {
5110 is_illegal = true;
5111 }
5112 } else { // not interface
5113 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
5114 is_illegal = true;
5115 }
5116 }
5117
5118 if (is_illegal) {
5119 ResourceMark rm(THREAD);
5120 Exceptions::fthrow(
5121 THREAD_AND_LOCATION,
5122 vmSymbols::java_lang_ClassFormatError(),
5123 "Illegal field modifiers in class %s: 0x%X",
5124 _class_name->as_C_string(), flags);
5125 return;
5126 }
5127 }
5128
5129 void ClassFileParser::verify_legal_method_modifiers(jint flags,
5130 bool is_interface,
5131 const Symbol* name,
5132 TRAPS) const {
5133 if (!_need_verify) { return; }
5134
5135 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5136 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5137 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5138 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5139 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
5140 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5141 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
5142 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
5143 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
5144 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5145 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
5146 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
5147 const bool is_initializer = (name == vmSymbols::object_initializer_name());
5148
5149 bool is_illegal = false;
5150
5151 if (is_interface) {
5152 if (major_gte_8) {
5153 // Class file version is JAVA_8_VERSION or later Methods of
5154 // interfaces may set any of the flags except ACC_PROTECTED,
5155 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5156 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5157 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5158 (is_native || is_protected || is_final || is_synchronized) ||
5159 // If a specific method of a class or interface has its
5160 // ACC_ABSTRACT flag set, it must not have any of its
5161 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5162 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
5163 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5164 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5165 (is_abstract && (is_private || is_static || is_strict))) {
5166 is_illegal = true;
5167 }
5168 } else if (major_gte_1_5) {
5169 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5170 if (!is_public || is_private || is_protected || is_static || is_final ||
5171 is_synchronized || is_native || !is_abstract || is_strict) {
5172 is_illegal = true;
5173 }
5174 } else {
5175 // Class file version is pre-JAVA_1_5_VERSION
5176 if (!is_public || is_static || is_final || is_native || !is_abstract) {
5177 is_illegal = true;
5178 }
5179 }
5180 } else { // not interface
5181 if (has_illegal_visibility(flags)) {
5182 is_illegal = true;
5183 } else {
5184 if (is_initializer) {
5185 if (is_static || is_final || is_synchronized || is_native ||
5186 is_abstract || (major_gte_1_5 && is_bridge)) {
5187 is_illegal = true;
5188 }
5189 } else { // not initializer
5190 if (is_abstract) {
5191 if ((is_final || is_native || is_private || is_static ||
5192 (major_gte_1_5 && (is_synchronized || is_strict)))) {
5193 is_illegal = true;
5194 }
5195 }
5196 }
5197 }
5198 }
5199
5200 if (is_illegal) {
5201 ResourceMark rm(THREAD);
5202 Exceptions::fthrow(
5203 THREAD_AND_LOCATION,
5204 vmSymbols::java_lang_ClassFormatError(),
5205 "Method %s in class %s has illegal modifiers: 0x%X",
5206 name->as_C_string(), _class_name->as_C_string(), flags);
5207 return;
5208 }
5209 }
5210
5211 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5212 int length,
5213 TRAPS) const {
5214 assert(_need_verify, "only called when _need_verify is true");
5215 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5216 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5217 }
5218 }
5219
5220 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5221 // In class names, '/' separates unqualified names. This is verified in this function also.
5222 // Method names also may not contain the characters '<' or '>', unless <init>
5223 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5224 // method. Because these names have been checked as special cases before
5225 // calling this method in verify_legal_method_name.
5226 //
5227 // This method is also called from the modular system APIs in modules.cpp
5228 // to verify the validity of module and package names.
5229 bool ClassFileParser::verify_unqualified_name(const char* name,
5230 unsigned int length,
5231 int type) {
5232 if (length == 0) return false; // Must have at least one char.
5233 for (const char* p = name; p != name + length; p++) {
5234 switch(*p) {
5235 case JVM_SIGNATURE_DOT:
5236 case JVM_SIGNATURE_ENDCLASS:
5237 case JVM_SIGNATURE_ARRAY:
5238 // do not permit '.', ';', or '['
5239 return false;
5240 case JVM_SIGNATURE_SLASH:
5241 // check for '//' or leading or trailing '/' which are not legal
5242 // unqualified name must not be empty
5243 if (type == ClassFileParser::LegalClass) {
5244 if (p == name || p+1 >= name+length ||
5245 *(p+1) == JVM_SIGNATURE_SLASH) {
5246 return false;
5247 }
5248 } else {
5249 return false; // do not permit '/' unless it's class name
5250 }
5251 break;
5252 case JVM_SIGNATURE_SPECIAL:
5253 case JVM_SIGNATURE_ENDSPECIAL:
5254 // do not permit '<' or '>' in method names
5255 if (type == ClassFileParser::LegalMethod) {
5256 return false;
5257 }
5258 }
5259 }
5260 return true;
5261 }
5262
5263 // Take pointer to a UTF8 byte string (not NUL-terminated).
5264 // Skip over the longest part of the string that could
5265 // be taken as a fieldname. Allow '/' if slash_ok is true.
5266 // Return a pointer to just past the fieldname.
5267 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5268 // being true, we saw consecutive slashes (meaning we were looking for a
5269 // qualified path but found something that was badly-formed).
5270 static const char* skip_over_field_name(const char* const name,
5271 bool slash_ok,
5272 unsigned int length) {
5273 const char* p;
5274 jboolean last_is_slash = false;
5275 jboolean not_first_ch = false;
5276
5277 for (p = name; p != name + length; not_first_ch = true) {
5278 const char* old_p = p;
5279 jchar ch = *p;
5280 if (ch < 128) {
5281 p++;
5282 // quick check for ascii
5283 if ((ch >= 'a' && ch <= 'z') ||
5284 (ch >= 'A' && ch <= 'Z') ||
5285 (ch == '_' || ch == '$') ||
5286 (not_first_ch && ch >= '0' && ch <= '9')) {
5287 last_is_slash = false;
5288 continue;
5289 }
5290 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
5291 if (last_is_slash) {
5292 return NULL; // Don't permit consecutive slashes
5293 }
5294 last_is_slash = true;
5295 continue;
5296 }
5297 }
5298 else {
5299 jint unicode_ch;
5300 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5301 p = tmp_p;
5302 last_is_slash = false;
5303 // Check if ch is Java identifier start or is Java identifier part
5304 // 4672820: call java.lang.Character methods directly without generating separate tables.
5305 EXCEPTION_MARK;
5306 // return value
5307 JavaValue result(T_BOOLEAN);
5308 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
5309 JavaCallArguments args;
5310 args.push_int(unicode_ch);
5311
5312 if (not_first_ch) {
5313 // public static boolean isJavaIdentifierPart(char ch);
5314 JavaCalls::call_static(&result,
5315 SystemDictionary::Character_klass(),
5316 vmSymbols::isJavaIdentifierPart_name(),
5317 vmSymbols::int_bool_signature(),
5318 &args,
5319 THREAD);
5320 } else {
5321 // public static boolean isJavaIdentifierStart(char ch);
5322 JavaCalls::call_static(&result,
5323 SystemDictionary::Character_klass(),
5324 vmSymbols::isJavaIdentifierStart_name(),
5325 vmSymbols::int_bool_signature(),
5326 &args,
5327 THREAD);
5328 }
5329 if (HAS_PENDING_EXCEPTION) {
5330 CLEAR_PENDING_EXCEPTION;
5331 return NULL;
5332 }
5333 if(result.get_jboolean()) {
5334 continue;
5335 }
5336 }
5337 return (not_first_ch) ? old_p : NULL;
5338 }
5339 return (not_first_ch) ? p : NULL;
5340 }
5341
5342 // Take pointer to a UTF8 byte string (not NUL-terminated).
5343 // Skip over the longest part of the string that could
5344 // be taken as a field signature. Allow "void" if void_ok.
5345 // Return a pointer to just past the signature.
5346 // Return NULL if no legal signature is found.
5347 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5348 bool void_ok,
5349 unsigned int length,
5350 TRAPS) const {
5351 unsigned int array_dim = 0;
5352 while (length > 0) {
5353 switch (signature[0]) {
5354 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5355 case JVM_SIGNATURE_BOOLEAN:
5356 case JVM_SIGNATURE_BYTE:
5357 case JVM_SIGNATURE_CHAR:
5358 case JVM_SIGNATURE_SHORT:
5359 case JVM_SIGNATURE_INT:
5360 case JVM_SIGNATURE_FLOAT:
5361 case JVM_SIGNATURE_LONG:
5362 case JVM_SIGNATURE_DOUBLE:
5363 return signature + 1;
5364 case JVM_SIGNATURE_CLASS: {
5365 if (_major_version < JAVA_1_5_VERSION) {
5366 // Skip over the class name if one is there
5367 const char* const p = skip_over_field_name(signature + 1, true, --length);
5368
5369 // The next character better be a semicolon
5370 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
5371 return p + 1;
5372 }
5373 }
5374 else {
5375 // Skip leading 'L' and ignore first appearance of ';'
5376 signature++;
5377 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
5378 // Format check signature
5379 if (c != NULL) {
5380 int newlen = c - (char*) signature;
5381 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5382 if (!legal) {
5383 classfile_parse_error("Class name is empty or contains illegal character "
5384 "in descriptor in class file %s",
5385 CHECK_NULL);
5386 return NULL;
5387 }
5388 return signature + newlen + 1;
5389 }
5390 }
5391 return NULL;
5392 }
5393 case JVM_SIGNATURE_ARRAY:
5394 array_dim++;
5395 if (array_dim > 255) {
5396 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5397 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_NULL);
5398 }
5399 // The rest of what's there better be a legal signature
5400 signature++;
5401 length--;
5402 void_ok = false;
5403 break;
5404 default:
5405 return NULL;
5406 }
5407 }
5408 return NULL;
5409 }
5410
5411 // Checks if name is a legal class name.
5412 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5413 if (!_need_verify || _relax_verify) { return; }
5414
5415 assert(name->refcount() > 0, "symbol must be kept alive");
5416 char* bytes = (char*)name->bytes();
5417 unsigned int length = name->utf8_length();
5418 bool legal = false;
5419
5420 if (length > 0) {
5421 const char* p;
5422 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5423 p = skip_over_field_signature(bytes, false, length, CHECK);
5424 legal = (p != NULL) && ((p - bytes) == (int)length);
5425 } else if (_major_version < JAVA_1_5_VERSION) {
5426 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5427 p = skip_over_field_name(bytes, true, length);
5428 legal = (p != NULL) && ((p - bytes) == (int)length);
5429 }
5430 } else {
5431 // 4900761: relax the constraints based on JSR202 spec
5432 // Class names may be drawn from the entire Unicode character set.
5433 // Identifiers between '/' must be unqualified names.
5434 // The utf8 string has been verified when parsing cpool entries.
5435 legal = verify_unqualified_name(bytes, length, LegalClass);
5436 }
5437 }
5438 if (!legal) {
5439 ResourceMark rm(THREAD);
5440 assert(_class_name != NULL, "invariant");
5441 Exceptions::fthrow(
5442 THREAD_AND_LOCATION,
5443 vmSymbols::java_lang_ClassFormatError(),
5444 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5445 _class_name->as_C_string()
5446 );
5447 return;
5448 }
5449 }
5450
5451 // Checks if name is a legal field name.
5452 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5453 if (!_need_verify || _relax_verify) { return; }
5454
5455 char* bytes = (char*)name->bytes();
5456 unsigned int length = name->utf8_length();
5457 bool legal = false;
5458
5459 if (length > 0) {
5460 if (_major_version < JAVA_1_5_VERSION) {
5461 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5462 const char* p = skip_over_field_name(bytes, false, length);
5463 legal = (p != NULL) && ((p - bytes) == (int)length);
5464 }
5465 } else {
5466 // 4881221: relax the constraints based on JSR202 spec
5467 legal = verify_unqualified_name(bytes, length, LegalField);
5468 }
5469 }
5470
5471 if (!legal) {
5472 ResourceMark rm(THREAD);
5473 assert(_class_name != NULL, "invariant");
5474 Exceptions::fthrow(
5475 THREAD_AND_LOCATION,
5476 vmSymbols::java_lang_ClassFormatError(),
5477 "Illegal field name \"%.*s\" in class %s", length, bytes,
5478 _class_name->as_C_string()
5479 );
5480 return;
5481 }
5482 }
5483
5484 // Checks if name is a legal method name.
5485 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5486 if (!_need_verify || _relax_verify) { return; }
5487
5488 assert(name != NULL, "method name is null");
5489 char* bytes = (char*)name->bytes();
5490 unsigned int length = name->utf8_length();
5491 bool legal = false;
5492
5493 if (length > 0) {
5494 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5495 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5496 legal = true;
5497 }
5498 } else if (_major_version < JAVA_1_5_VERSION) {
5499 const char* p;
5500 p = skip_over_field_name(bytes, false, length);
5501 legal = (p != NULL) && ((p - bytes) == (int)length);
5502 } else {
5503 // 4881221: relax the constraints based on JSR202 spec
5504 legal = verify_unqualified_name(bytes, length, LegalMethod);
5505 }
5506 }
5507
5508 if (!legal) {
5509 ResourceMark rm(THREAD);
5510 assert(_class_name != NULL, "invariant");
5511 Exceptions::fthrow(
5512 THREAD_AND_LOCATION,
5513 vmSymbols::java_lang_ClassFormatError(),
5514 "Illegal method name \"%.*s\" in class %s", length, bytes,
5515 _class_name->as_C_string()
5516 );
5517 return;
5518 }
5519 }
5520
5521
5522 // Checks if signature is a legal field signature.
5523 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5524 const Symbol* signature,
5525 TRAPS) const {
5526 if (!_need_verify) { return; }
5527
5528 const char* const bytes = (const char* const)signature->bytes();
5529 const unsigned int length = signature->utf8_length();
5530 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5531
5532 if (p == NULL || (p - bytes) != (int)length) {
5533 throwIllegalSignature("Field", name, signature, CHECK);
5534 }
5535 }
5536
5537 // Checks if signature is a legal method signature.
5538 // Returns number of parameters
5539 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5540 const Symbol* signature,
5541 TRAPS) const {
5542 if (!_need_verify) {
5543 // make sure caller's args_size will be less than 0 even for non-static
5544 // method so it will be recomputed in compute_size_of_parameters().
5545 return -2;
5546 }
5547
5548 // Class initializers cannot have args for class format version >= 51.
5549 if (name == vmSymbols::class_initializer_name() &&
5550 signature != vmSymbols::void_method_signature() &&
5551 _major_version >= JAVA_7_VERSION) {
5552 throwIllegalSignature("Method", name, signature, CHECK_0);
5553 return 0;
5554 }
5555
5556 unsigned int args_size = 0;
5557 const char* p = (const char*)signature->bytes();
5558 unsigned int length = signature->utf8_length();
5559 const char* nextp;
5560
5561 // The first character must be a '('
5562 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5563 length--;
5564 // Skip over legal field signatures
5565 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5566 while ((length > 0) && (nextp != NULL)) {
5567 args_size++;
5568 if (p[0] == 'J' || p[0] == 'D') {
5569 args_size++;
5570 }
5571 length -= nextp - p;
5572 p = nextp;
5573 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5574 }
5575 // The first non-signature thing better be a ')'
5576 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5577 length--;
5578 if (name->utf8_length() > 0 && name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
5579 // All internal methods must return void
5580 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5581 return args_size;
5582 }
5583 } else {
5584 // Now we better just have a return value
5585 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5586 if (nextp && ((int)length == (nextp - p))) {
5587 return args_size;
5588 }
5589 }
5590 }
5591 }
5592 // Report error
5593 throwIllegalSignature("Method", name, signature, CHECK_0);
5594 return 0;
5595 }
5596
5597 int ClassFileParser::static_field_size() const {
5598 assert(_field_info != NULL, "invariant");
5599 return _field_info->_static_field_size;
5600 }
5601
5602 int ClassFileParser::total_oop_map_count() const {
5603 assert(_field_info != NULL, "invariant");
5604 return _field_info->oop_map_blocks->_nonstatic_oop_map_count;
5605 }
5606
5607 jint ClassFileParser::layout_size() const {
5608 assert(_field_info != NULL, "invariant");
5609 return _field_info->_instance_size;
5610 }
5611
5612 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5613 const Array<Method*>* methods) {
5614 assert(ik != NULL, "invariant");
5615 assert(methods != NULL, "invariant");
5616
5617 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5618 // (We used to do this lazily, but now we query it in Rewriter,
5619 // which is eagerly done for every method, so we might as well do it now,
5620 // when everything is fresh in memory.)
5621 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5622
5623 if (klass_id != vmSymbols::NO_SID) {
5624 for (int j = 0; j < methods->length(); ++j) {
5625 Method* method = methods->at(j);
5626 method->init_intrinsic_id();
5627
5628 if (CheckIntrinsics) {
5629 // Check if an intrinsic is defined for method 'method',
5630 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5631 if (method->intrinsic_id() != vmIntrinsics::_none &&
5632 !method->intrinsic_candidate()) {
5633 tty->print("Compiler intrinsic is defined for method [%s], "
5634 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5635 method->name_and_sig_as_C_string(),
5636 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5637 );
5638 tty->cr();
5639 DEBUG_ONLY(vm_exit(1));
5640 }
5641 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5642 // but there is no intrinsic available for it.
5643 if (method->intrinsic_candidate() &&
5644 method->intrinsic_id() == vmIntrinsics::_none) {
5645 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5646 "but no compiler intrinsic is defined for the method.%s",
5647 method->name_and_sig_as_C_string(),
5648 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5649 );
5650 tty->cr();
5651 DEBUG_ONLY(vm_exit(1));
5652 }
5653 }
5654 } // end for
5655
5656 #ifdef ASSERT
5657 if (CheckIntrinsics) {
5658 // Check for orphan methods in the current class. A method m
5659 // of a class C is orphan if an intrinsic is defined for method m,
5660 // but class C does not declare m.
5661 // The check is potentially expensive, therefore it is available
5662 // only in debug builds.
5663
5664 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5665 if (vmIntrinsics::_compiledLambdaForm == id) {
5666 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5667 // generated for the JVM from a LambdaForm and therefore no method
5668 // is defined for it.
5669 continue;
5670 }
5671
5672 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5673 // Check if the current class contains a method with the same
5674 // name, flags, signature.
5675 bool match = false;
5676 for (int j = 0; j < methods->length(); ++j) {
5677 const Method* method = methods->at(j);
5678 if (method->intrinsic_id() == id) {
5679 match = true;
5680 break;
5681 }
5682 }
5683
5684 if (!match) {
5685 char buf[1000];
5686 tty->print("Compiler intrinsic is defined for method [%s], "
5687 "but the method is not available in class [%s].%s",
5688 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5689 buf, sizeof(buf)),
5690 ik->name()->as_C_string(),
5691 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5692 );
5693 tty->cr();
5694 DEBUG_ONLY(vm_exit(1));
5695 }
5696 }
5697 } // end for
5698 } // CheckIntrinsics
5699 #endif // ASSERT
5700 }
5701 }
5702
5703 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5704 const ClassInstanceInfo& cl_inst_info,
5705 TRAPS) {
5706 if (_klass != NULL) {
5707 return _klass;
5708 }
5709
5710 InstanceKlass* const ik =
5711 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5712
5713 if (is_hidden()) {
5714 mangle_hidden_class_name(ik);
5715 }
5716
5717 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5718
5719 assert(_klass == ik, "invariant");
5720
5721
5722 if (ik->should_store_fingerprint()) {
5723 ik->store_fingerprint(_stream->compute_fingerprint());
5724 }
5725
5726 ik->set_has_passed_fingerprint_check(false);
5727 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5728 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5729 uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint();
5730 if (aot_fp != 0 && aot_fp == fp) {
5731 // This class matches with a class saved in an AOT library
5732 ik->set_has_passed_fingerprint_check(true);
5733 } else {
5734 ResourceMark rm;
5735 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5736 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5737 }
5738 }
5739
5740 return ik;
5741 }
5742
5743 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5744 bool changed_by_loadhook,
5745 const ClassInstanceInfo& cl_inst_info,
5746 TRAPS) {
5747 assert(ik != NULL, "invariant");
5748
5749 // Set name and CLD before adding to CLD
5750 ik->set_class_loader_data(_loader_data);
5751 ik->set_name(_class_name);
5752
5753 // Add all classes to our internal class loader list here,
5754 // including classes in the bootstrap (NULL) class loader.
5755 const bool publicize = !is_internal();
5756
5757 _loader_data->add_class(ik, publicize);
5758
5759 set_klass_to_deallocate(ik);
5760
5761 assert(_field_info != NULL, "invariant");
5762 assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5763 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5764 "sanity");
5765
5766 assert(ik->is_instance_klass(), "sanity");
5767 assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5768
5769 // Fill in information already parsed
5770 ik->set_should_verify_class(_need_verify);
5771
5772 // Not yet: supers are done below to support the new subtype-checking fields
5773 ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5774 ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5775 assert(_fac != NULL, "invariant");
5776 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5777
5778 // this transfers ownership of a lot of arrays from
5779 // the parser onto the InstanceKlass*
5780 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5781
5782 // can only set dynamic nest-host after static nest information is set
5783 if (cl_inst_info.dynamic_nest_host() != NULL) {
5784 ik->set_nest_host(cl_inst_info.dynamic_nest_host(), THREAD);
5785 }
5786
5787 // note that is not safe to use the fields in the parser from this point on
5788 assert(NULL == _cp, "invariant");
5789 assert(NULL == _fields, "invariant");
5790 assert(NULL == _methods, "invariant");
5791 assert(NULL == _inner_classes, "invariant");
5792 assert(NULL == _nest_members, "invariant");
5793 assert(NULL == _combined_annotations, "invariant");
5794 assert(NULL == _record_components, "invariant");
5795 assert(NULL == _permitted_subclasses, "invariant");
5796
5797 if (_has_final_method) {
5798 ik->set_has_final_method();
5799 }
5800
5801 ik->copy_method_ordering(_method_ordering, CHECK);
5802 // The InstanceKlass::_methods_jmethod_ids cache
5803 // is managed on the assumption that the initial cache
5804 // size is equal to the number of methods in the class. If
5805 // that changes, then InstanceKlass::idnum_can_increment()
5806 // has to be changed accordingly.
5807 ik->set_initial_method_idnum(ik->methods()->length());
5808
5809 ik->set_this_class_index(_this_class_index);
5810
5811 if (_is_hidden || is_unsafe_anonymous()) {
5812 // _this_class_index is a CONSTANT_Class entry that refers to this
5813 // hidden or anonymous class itself. If this class needs to refer to its own
5814 // methods or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5815 // _this_class_index. However, because this class is hidden or anonymous (it's
5816 // not stored in SystemDictionary), _this_class_index cannot be resolved
5817 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5818 // Therefore, we must eagerly resolve _this_class_index now.
5819 ik->constants()->klass_at_put(_this_class_index, ik);
5820 }
5821
5822 ik->set_minor_version(_minor_version);
5823 ik->set_major_version(_major_version);
5824 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5825 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5826
5827 if (_unsafe_anonymous_host != NULL) {
5828 assert (ik->is_unsafe_anonymous(), "should be the same");
5829 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host);
5830 }
5831 if (_is_hidden) {
5832 ik->set_is_hidden();
5833 }
5834
5835 // Set PackageEntry for this_klass
5836 oop cl = ik->class_loader();
5837 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5838 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5839 ik->set_package(cld, NULL, CHECK);
5840
5841 const Array<Method*>* const methods = ik->methods();
5842 assert(methods != NULL, "invariant");
5843 const int methods_len = methods->length();
5844
5845 check_methods_for_intrinsics(ik, methods);
5846
5847 // Fill in field values obtained by parse_classfile_attributes
5848 if (_parsed_annotations->has_any_annotations()) {
5849 _parsed_annotations->apply_to(ik);
5850 }
5851
5852 apply_parsed_class_attributes(ik);
5853
5854 // Miranda methods
5855 if ((_num_miranda_methods > 0) ||
5856 // if this class introduced new miranda methods or
5857 (_super_klass != NULL && _super_klass->has_miranda_methods())
5858 // super class exists and this class inherited miranda methods
5859 ) {
5860 ik->set_has_miranda_methods(); // then set a flag
5861 }
5862
5863 // Fill in information needed to compute superclasses.
5864 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5865 ik->set_transitive_interfaces(_transitive_interfaces);
5866 ik->set_local_interfaces(_local_interfaces);
5867 _transitive_interfaces = NULL;
5868 _local_interfaces = NULL;
5869
5870 // Initialize itable offset tables
5871 klassItable::setup_itable_offset_table(ik);
5872
5873 // Compute transitive closure of interfaces this class implements
5874 // Do final class setup
5875 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5876 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5877 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5878 }
5879
5880 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5881 ( _super_klass != NULL && _super_klass->has_contended_annotations())) {
5882 ik->set_has_contended_annotations(true);
5883 }
5884
5885 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5886 set_precomputed_flags(ik);
5887
5888 // check if this class can access its super class
5889 check_super_class_access(ik, CHECK);
5890
5891 // check if this class can access its superinterfaces
5892 check_super_interface_access(ik, CHECK);
5893
5894 // check if this class overrides any final method
5895 check_final_method_override(ik, CHECK);
5896
5897 // reject static interface methods prior to Java 8
5898 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5899 check_illegal_static_method(ik, CHECK);
5900 }
5901
5902 // Obtain this_klass' module entry
5903 ModuleEntry* module_entry = ik->module();
5904 assert(module_entry != NULL, "module_entry should always be set");
5905
5906 // Obtain java.lang.Module
5907 Handle module_handle(THREAD, module_entry->module());
5908
5909 // Allocate mirror and initialize static fields
5910 // The create_mirror() call will also call compute_modifiers()
5911 java_lang_Class::create_mirror(ik,
5912 Handle(THREAD, _loader_data->class_loader()),
5913 module_handle,
5914 _protection_domain,
5915 cl_inst_info.class_data(),
5916 CHECK);
5917
5918 assert(_all_mirandas != NULL, "invariant");
5919
5920 // Generate any default methods - default methods are public interface methods
5921 // that have a default implementation. This is new with Java 8.
5922 if (_has_nonstatic_concrete_methods) {
5923 DefaultMethods::generate_default_methods(ik,
5924 _all_mirandas,
5925 CHECK);
5926 }
5927
5928 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5929 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5930 !module_entry->has_default_read_edges()) {
5931 if (!module_entry->set_has_default_read_edges()) {
5932 // We won a potential race
5933 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5934 }
5935 }
5936
5937 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5938
5939 if (!is_internal()) {
5940 if (log_is_enabled(Info, class, load)) {
5941 ResourceMark rm;
5942 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5943 ik->print_class_load_logging(_loader_data, module_name, _stream);
5944 }
5945
5946 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5947 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5948 log_is_enabled(Info, class, preview)) {
5949 ResourceMark rm;
5950 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5951 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5952 }
5953
5954 if (log_is_enabled(Debug, class, resolve)) {
5955 ResourceMark rm;
5956 // print out the superclass.
5957 const char * from = ik->external_name();
5958 if (ik->java_super() != NULL) {
5959 log_debug(class, resolve)("%s %s (super)",
5960 from,
5961 ik->java_super()->external_name());
5962 }
5963 // print out each of the interface classes referred to by this class.
5964 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5965 if (local_interfaces != NULL) {
5966 const int length = local_interfaces->length();
5967 for (int i = 0; i < length; i++) {
5968 const InstanceKlass* const k = local_interfaces->at(i);
5969 const char * to = k->external_name();
5970 log_debug(class, resolve)("%s %s (interface)", from, to);
5971 }
5972 }
5973 }
5974 }
5975
5976 JFR_ONLY(INIT_ID(ik);)
5977
5978 // If we reach here, all is well.
5979 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5980 // in order for it to not be destroyed in the ClassFileParser destructor.
5981 set_klass_to_deallocate(NULL);
5982
5983 // it's official
5984 set_klass(ik);
5985
5986 debug_only(ik->verify();)
5987 }
5988
5989 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5990 // Decrement the refcount in the old name, since we're clobbering it.
5991 _class_name->decrement_refcount();
5992
5993 _class_name = new_class_name;
5994 // Increment the refcount of the new name.
5995 // Now the ClassFileParser owns this name and will decrement in
5996 // the destructor.
5997 _class_name->increment_refcount();
5998 }
5999
6000 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's
6001 // package by prepending its host class's package name to its class name and setting
6002 // its _class_name field.
6003 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) {
6004 ResourceMark rm(THREAD);
6005 assert(strrchr(_class_name->as_C_string(), JVM_SIGNATURE_SLASH) == NULL,
6006 "Unsafe anonymous class should not be in a package");
6007 TempNewSymbol host_pkg_name =
6008 ClassLoader::package_from_class_name(unsafe_anonymous_host->name());
6009
6010 if (host_pkg_name != NULL) {
6011 int host_pkg_len = host_pkg_name->utf8_length();
6012 int class_name_len = _class_name->utf8_length();
6013 int symbol_len = host_pkg_len + 1 + class_name_len;
6014 char* new_anon_name = NEW_RESOURCE_ARRAY(char, symbol_len + 1);
6015 int n = os::snprintf(new_anon_name, symbol_len + 1, "%.*s/%.*s",
6016 host_pkg_len, host_pkg_name->base(), class_name_len, _class_name->base());
6017 assert(n == symbol_len, "Unexpected number of characters in string");
6018
6019 // Decrement old _class_name to avoid leaking.
6020 _class_name->decrement_refcount();
6021
6022 // Create a symbol and update the anonymous class name.
6023 // The new class name is created with a refcount of one. When installed into the InstanceKlass,
6024 // it'll be two and when the ClassFileParser destructor runs, it'll go back to one and get deleted
6025 // when the class is unloaded.
6026 _class_name = SymbolTable::new_symbol(new_anon_name, symbol_len);
6027 }
6028 }
6029
6030 // If the host class and the anonymous class are in the same package then do
6031 // nothing. If the anonymous class is in the unnamed package then move it to its
6032 // host's package. If the classes are in different packages then throw an IAE
6033 // exception.
6034 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) {
6035 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class");
6036
6037 const jbyte* anon_last_slash = UTF8::strrchr((const jbyte*)_class_name->base(),
6038 _class_name->utf8_length(), JVM_SIGNATURE_SLASH);
6039 if (anon_last_slash == NULL) { // Unnamed package
6040 prepend_host_package_name(_unsafe_anonymous_host, CHECK);
6041 } else {
6042 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) {
6043 ResourceMark rm(THREAD);
6044 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
6045 err_msg("Host class %s and anonymous class %s are in different packages",
6046 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string()));
6047 }
6048 }
6049 }
6050
6051 static bool relax_format_check_for(ClassLoaderData* loader_data) {
6052 bool trusted = loader_data->is_boot_class_loader_data() ||
6053 loader_data->is_platform_class_loader_data();
6054 bool need_verify =
6055 // verifyAll
6056 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
6057 // verifyRemote
6058 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
6059 return !need_verify;
6060 }
6061
6062 ClassFileParser::ClassFileParser(ClassFileStream* stream,
6063 Symbol* name,
6064 ClassLoaderData* loader_data,
6065 const ClassLoadInfo* cl_info,
6066 Publicity pub_level,
6067 TRAPS) :
6068 _stream(stream),
6069 _class_name(NULL),
6070 _loader_data(loader_data),
6071 _unsafe_anonymous_host(cl_info->unsafe_anonymous_host()),
6072 _cp_patches(cl_info->cp_patches()),
6073 _is_hidden(cl_info->is_hidden()),
6074 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
6075 _num_patched_klasses(0),
6076 _max_num_patched_klasses(0),
6077 _orig_cp_size(0),
6078 _first_patched_klass_resolved_index(0),
6079 _super_klass(),
6080 _cp(NULL),
6081 _fields(NULL),
6082 _methods(NULL),
6083 _inner_classes(NULL),
6084 _nest_members(NULL),
6085 _nest_host(0),
6086 _permitted_subclasses(NULL),
6087 _record_components(NULL),
6088 _local_interfaces(NULL),
6089 _transitive_interfaces(NULL),
6090 _combined_annotations(NULL),
6091 _class_annotations(NULL),
6092 _class_type_annotations(NULL),
6093 _fields_annotations(NULL),
6094 _fields_type_annotations(NULL),
6095 _klass(NULL),
6096 _klass_to_deallocate(NULL),
6097 _parsed_annotations(NULL),
6098 _fac(NULL),
6099 _field_info(NULL),
6100 _method_ordering(NULL),
6101 _all_mirandas(NULL),
6102 _vtable_size(0),
6103 _itable_size(0),
6104 _num_miranda_methods(0),
6105 _rt(REF_NONE),
6106 _protection_domain(cl_info->protection_domain()),
6107 _access_flags(),
6108 _pub_level(pub_level),
6109 _bad_constant_seen(0),
6110 _synthetic_flag(false),
6111 _sde_length(false),
6112 _sde_buffer(NULL),
6113 _sourcefile_index(0),
6114 _generic_signature_index(0),
6115 _major_version(0),
6116 _minor_version(0),
6117 _this_class_index(0),
6118 _super_class_index(0),
6119 _itfs_len(0),
6120 _java_fields_count(0),
6121 _need_verify(false),
6122 _relax_verify(false),
6123 _has_nonstatic_concrete_methods(false),
6124 _declares_nonstatic_concrete_methods(false),
6125 _has_final_method(false),
6126 _has_contended_fields(false),
6127 _has_finalizer(false),
6128 _has_empty_finalizer(false),
6129 _has_vanilla_constructor(false),
6130 _max_bootstrap_specifier_index(-1) {
6131
6132 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6133 _class_name->increment_refcount();
6134
6135 assert(THREAD->is_Java_thread(), "invariant");
6136 assert(_loader_data != NULL, "invariant");
6137 assert(stream != NULL, "invariant");
6138 assert(_stream != NULL, "invariant");
6139 assert(_stream->buffer() == _stream->current(), "invariant");
6140 assert(_class_name != NULL, "invariant");
6141 assert(0 == _access_flags.as_int(), "invariant");
6142
6143 // Figure out whether we can skip format checking (matching classic VM behavior)
6144 if (DumpSharedSpaces) {
6145 // verify == true means it's a 'remote' class (i.e., non-boot class)
6146 // Verification decision is based on BytecodeVerificationRemote flag
6147 // for those classes.
6148 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
6149 BytecodeVerificationLocal;
6150 }
6151 else {
6152 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
6153 stream->need_verify());
6154 }
6155 if (_cp_patches != NULL) {
6156 int len = _cp_patches->length();
6157 for (int i=0; i<len; i++) {
6158 if (has_cp_patch_at(i)) {
6159 Handle patch = cp_patch_at(i);
6160 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
6161 // We need to append the names of the patched classes to the end of the constant pool,
6162 // because a patched class may have a Utf8 name that's not already included in the
6163 // original constant pool. These class names are used when patch_constant_pool()
6164 // calls patch_class().
6165 //
6166 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
6167 // At this point, we don't know the tag for index i yet, because we haven't parsed the
6168 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
6169 _max_num_patched_klasses++;
6170 }
6171 }
6172 }
6173 }
6174
6175 // synch back verification state to stream
6176 stream->set_verify(_need_verify);
6177
6178 // Check if verification needs to be relaxed for this class file
6179 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
6180 _relax_verify = relax_format_check_for(_loader_data);
6181
6182 parse_stream(stream, CHECK);
6183
6184 post_process_parsed_stream(stream, _cp, CHECK);
6185 }
6186
6187 void ClassFileParser::clear_class_metadata() {
6188 // metadata created before the instance klass is created. Must be
6189 // deallocated if classfile parsing returns an error.
6190 _cp = NULL;
6191 _fields = NULL;
6192 _methods = NULL;
6193 _inner_classes = NULL;
6194 _nest_members = NULL;
6195 _permitted_subclasses = NULL;
6196 _combined_annotations = NULL;
6197 _class_annotations = _class_type_annotations = NULL;
6198 _fields_annotations = _fields_type_annotations = NULL;
6199 _record_components = NULL;
6200 }
6201
6202 // Destructor to clean up
6203 ClassFileParser::~ClassFileParser() {
6204 _class_name->decrement_refcount();
6205
6206 if (_cp != NULL) {
6207 MetadataFactory::free_metadata(_loader_data, _cp);
6208 }
6209 if (_fields != NULL) {
6210 MetadataFactory::free_array<u2>(_loader_data, _fields);
6211 }
6212
6213 if (_methods != NULL) {
6214 // Free methods
6215 InstanceKlass::deallocate_methods(_loader_data, _methods);
6216 }
6217
6218 // beware of the Universe::empty_blah_array!!
6219 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6220 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6221 }
6222
6223 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
6224 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6225 }
6226
6227 if (_record_components != NULL) {
6228 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
6229 }
6230
6231 if (_permitted_subclasses != NULL && _permitted_subclasses != Universe::the_empty_short_array()) {
6232 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
6233 }
6234
6235 // Free interfaces
6236 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6237 _local_interfaces, _transitive_interfaces);
6238
6239 if (_combined_annotations != NULL) {
6240 // After all annotations arrays have been created, they are installed into the
6241 // Annotations object that will be assigned to the InstanceKlass being created.
6242
6243 // Deallocate the Annotations object and the installed annotations arrays.
6244 _combined_annotations->deallocate_contents(_loader_data);
6245
6246 // If the _combined_annotations pointer is non-NULL,
6247 // then the other annotations fields should have been cleared.
6248 assert(_class_annotations == NULL, "Should have been cleared");
6249 assert(_class_type_annotations == NULL, "Should have been cleared");
6250 assert(_fields_annotations == NULL, "Should have been cleared");
6251 assert(_fields_type_annotations == NULL, "Should have been cleared");
6252 } else {
6253 // If the annotations arrays were not installed into the Annotations object,
6254 // then they have to be deallocated explicitly.
6255 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
6256 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
6257 Annotations::free_contents(_loader_data, _fields_annotations);
6258 Annotations::free_contents(_loader_data, _fields_type_annotations);
6259 }
6260
6261 clear_class_metadata();
6262 _transitive_interfaces = NULL;
6263 _local_interfaces = NULL;
6264
6265 // deallocate the klass if already created. Don't directly deallocate, but add
6266 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6267 // at a safepoint.
6268 if (_klass_to_deallocate != NULL) {
6269 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6270 }
6271 }
6272
6273 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6274 TRAPS) {
6275
6276 assert(stream != NULL, "invariant");
6277 assert(_class_name != NULL, "invariant");
6278
6279 // BEGIN STREAM PARSING
6280 stream->guarantee_more(8, CHECK); // magic, major, minor
6281 // Magic value
6282 const u4 magic = stream->get_u4_fast();
6283 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6284 "Incompatible magic value %u in class file %s",
6285 magic, CHECK);
6286
6287 // Version numbers
6288 _minor_version = stream->get_u2_fast();
6289 _major_version = stream->get_u2_fast();
6290
6291 if (DumpSharedSpaces && _major_version < JAVA_6_VERSION) {
6292 ResourceMark rm;
6293 warning("Pre JDK 6 class not supported by CDS: %u.%u %s",
6294 _major_version, _minor_version, _class_name->as_C_string());
6295 Exceptions::fthrow(
6296 THREAD_AND_LOCATION,
6297 vmSymbols::java_lang_UnsupportedClassVersionError(),
6298 "Unsupported major.minor version for dump time %u.%u",
6299 _major_version,
6300 _minor_version);
6301 }
6302
6303 // Check version numbers - we check this even with verifier off
6304 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6305
6306 stream->guarantee_more(3, CHECK); // length, first cp tag
6307 u2 cp_size = stream->get_u2_fast();
6308
6309 guarantee_property(
6310 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6311 cp_size, CHECK);
6312
6313 _orig_cp_size = cp_size;
6314 if (is_hidden()) { // Add a slot for hidden class name.
6315 assert(_max_num_patched_klasses == 0, "Sanity check");
6316 cp_size++;
6317 } else {
6318 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6319 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6320 }
6321 cp_size += _max_num_patched_klasses;
6322 }
6323
6324 _cp = ConstantPool::allocate(_loader_data,
6325 cp_size,
6326 CHECK);
6327
6328 ConstantPool* const cp = _cp;
6329
6330 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6331
6332 assert(cp_size == (const u2)cp->length(), "invariant");
6333
6334 // ACCESS FLAGS
6335 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6336
6337 // Access flags
6338 jint flags;
6339 // JVM_ACC_MODULE is defined in JDK-9 and later.
6340 if (_major_version >= JAVA_9_VERSION) {
6341 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
6342 } else {
6343 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
6344 }
6345
6346 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6347 // Set abstract bit for old class files for backward compatibility
6348 flags |= JVM_ACC_ABSTRACT;
6349 }
6350
6351 verify_legal_class_modifiers(flags, CHECK);
6352
6353 short bad_constant = class_bad_constant_seen();
6354 if (bad_constant != 0) {
6355 // Do not throw CFE until after the access_flags are checked because if
6356 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6357 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6358 }
6359
6360 _access_flags.set_flags(flags);
6361
6362 // This class and superclass
6363 _this_class_index = stream->get_u2_fast();
6364 check_property(
6365 valid_cp_range(_this_class_index, cp_size) &&
6366 cp->tag_at(_this_class_index).is_unresolved_klass(),
6367 "Invalid this class index %u in constant pool in class file %s",
6368 _this_class_index, CHECK);
6369
6370 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6371 assert(class_name_in_cp != NULL, "class_name can't be null");
6372
6373 // Don't need to check whether this class name is legal or not.
6374 // It has been checked when constant pool is parsed.
6375 // However, make sure it is not an array type.
6376 if (_need_verify) {
6377 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
6378 "Bad class name in class file %s",
6379 CHECK);
6380 }
6381
6382 #ifdef ASSERT
6383 // Basic sanity checks
6384 assert(!(_is_hidden && (_unsafe_anonymous_host != NULL)), "mutually exclusive variants");
6385
6386 if (_unsafe_anonymous_host != NULL) {
6387 assert(_class_name == vmSymbols::unknown_class_name(), "A named anonymous class???");
6388 }
6389 if (_is_hidden) {
6390 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
6391 }
6392 #endif
6393
6394 // Update the _class_name as needed depending on whether this is a named,
6395 // un-named, hidden or unsafe-anonymous class.
6396
6397 if (_is_hidden) {
6398 assert(_class_name != NULL, "Unexpected null _class_name");
6399 #ifdef ASSERT
6400 if (_need_verify) {
6401 verify_legal_class_name(_class_name, CHECK);
6402 }
6403 #endif
6404
6405 // NOTE: !_is_hidden does not imply "findable" as it could be an old-style
6406 // "hidden" unsafe-anonymous class
6407
6408 // If this is an anonymous class fix up its name if it is in the unnamed
6409 // package. Otherwise, throw IAE if it is in a different package than
6410 // its host class.
6411 } else if (_unsafe_anonymous_host != NULL) {
6412 update_class_name(class_name_in_cp);
6413 fix_unsafe_anonymous_class_name(CHECK);
6414
6415 } else {
6416 // Check if name in class file matches given name
6417 if (_class_name != class_name_in_cp) {
6418 if (_class_name != vmSymbols::unknown_class_name()) {
6419 ResourceMark rm(THREAD);
6420 Exceptions::fthrow(THREAD_AND_LOCATION,
6421 vmSymbols::java_lang_NoClassDefFoundError(),
6422 "%s (wrong name: %s)",
6423 class_name_in_cp->as_C_string(),
6424 _class_name->as_C_string()
6425 );
6426 return;
6427 } else {
6428 // The class name was not known by the caller so we set it from
6429 // the value in the CP.
6430 update_class_name(class_name_in_cp);
6431 }
6432 // else nothing to do: the expected class name matches what is in the CP
6433 }
6434 }
6435
6436 // Verification prevents us from creating names with dots in them, this
6437 // asserts that that's the case.
6438 assert(is_internal_format(_class_name), "external class name format used internally");
6439
6440 if (!is_internal()) {
6441 LogTarget(Debug, class, preorder) lt;
6442 if (lt.is_enabled()){
6443 ResourceMark rm(THREAD);
6444 LogStream ls(lt);
6445 ls.print("%s", _class_name->as_klass_external_name());
6446 if (stream->source() != NULL) {
6447 ls.print(" source: %s", stream->source());
6448 }
6449 ls.cr();
6450 }
6451
6452 #if INCLUDE_CDS
6453 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6454 if (!ClassLoader::has_jrt_entry()) {
6455 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6456 DumpLoadedClassList = NULL;
6457 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6458 !_is_hidden &&
6459 _unsafe_anonymous_host == NULL) {
6460 // Only dump the classes that can be stored into CDS archive.
6461 // Hidden and unsafe anonymous classes such as generated LambdaForm classes are also not included.
6462 oop class_loader = _loader_data->class_loader();
6463 ResourceMark rm(THREAD);
6464 bool skip = false;
6465 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6466 // For the boot and platform class loaders, skip classes that are not found in the
6467 // java runtime image, such as those found in the --patch-module entries.
6468 // These classes can't be loaded from the archive during runtime.
6469 if (!stream->from_boot_loader_modules_image() && strncmp(stream->source(), "jrt:", 4) != 0) {
6470 skip = true;
6471 }
6472
6473 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6474 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6475 // as they can be loaded from the archive during runtime.
6476 skip = false;
6477 }
6478 }
6479 if (skip) {
6480 tty->print_cr("skip writing class %s from source %s to classlist file",
6481 _class_name->as_C_string(), stream->source());
6482 } else {
6483 classlist_file->print_cr("%s", _class_name->as_C_string());
6484 classlist_file->flush();
6485 }
6486 }
6487 }
6488 #endif
6489 }
6490
6491 // SUPERKLASS
6492 _super_class_index = stream->get_u2_fast();
6493 _super_klass = parse_super_class(cp,
6494 _super_class_index,
6495 _need_verify,
6496 CHECK);
6497
6498 // Interfaces
6499 _itfs_len = stream->get_u2_fast();
6500 parse_interfaces(stream,
6501 _itfs_len,
6502 cp,
6503 &_has_nonstatic_concrete_methods,
6504 CHECK);
6505
6506 assert(_local_interfaces != NULL, "invariant");
6507
6508 // Fields (offsets are filled in later)
6509 _fac = new FieldAllocationCount();
6510 parse_fields(stream,
6511 _access_flags.is_interface(),
6512 _fac,
6513 cp,
6514 cp_size,
6515 &_java_fields_count,
6516 CHECK);
6517
6518 assert(_fields != NULL, "invariant");
6519
6520 // Methods
6521 AccessFlags promoted_flags;
6522 parse_methods(stream,
6523 _access_flags.is_interface(),
6524 &promoted_flags,
6525 &_has_final_method,
6526 &_declares_nonstatic_concrete_methods,
6527 CHECK);
6528
6529 assert(_methods != NULL, "invariant");
6530
6531 // promote flags from parse_methods() to the klass' flags
6532 _access_flags.add_promoted_flags(promoted_flags.as_int());
6533
6534 if (_declares_nonstatic_concrete_methods) {
6535 _has_nonstatic_concrete_methods = true;
6536 }
6537
6538 // Additional attributes/annotations
6539 _parsed_annotations = new ClassAnnotationCollector();
6540 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6541
6542 assert(_inner_classes != NULL, "invariant");
6543
6544 // Finalize the Annotations metadata object,
6545 // now that all annotation arrays have been created.
6546 create_combined_annotations(CHECK);
6547
6548 // Make sure this is the end of class file stream
6549 guarantee_property(stream->at_eos(),
6550 "Extra bytes at the end of class file %s",
6551 CHECK);
6552
6553 // all bytes in stream read and parsed
6554 }
6555
6556 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
6557 ResourceMark rm;
6558 // Construct hidden name from _class_name, "+", and &ik. Note that we can't
6559 // use a '/' because that confuses finding the class's package. Also, can't
6560 // use an illegal char such as ';' because that causes serialization issues
6561 // and issues with hidden classes that create their own hidden classes.
6562 char addr_buf[20];
6563 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
6564 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
6565 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
6566 jio_snprintf(new_name, new_name_len, "%s+%s",
6567 _class_name->as_C_string(), addr_buf);
6568 update_class_name(SymbolTable::new_symbol(new_name));
6569
6570 // Add a Utf8 entry containing the hidden name.
6571 assert(_class_name != NULL, "Unexpected null _class_name");
6572 int hidden_index = _orig_cp_size; // this is an extra slot we added
6573 _cp->symbol_at_put(hidden_index, _class_name);
6574
6575 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
6576 // We have to update the resolved_klass_index and the name_index together
6577 // so extract the existing resolved_klass_index first.
6578 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
6579 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
6580 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
6581 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
6582 "Bad name_index");
6583 }
6584
6585 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6586 ConstantPool* cp,
6587 TRAPS) {
6588 assert(stream != NULL, "invariant");
6589 assert(stream->at_eos(), "invariant");
6590 assert(cp != NULL, "invariant");
6591 assert(_loader_data != NULL, "invariant");
6592
6593 if (_class_name == vmSymbols::java_lang_Object()) {
6594 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6595 "java.lang.Object cannot implement an interface in class file %s",
6596 CHECK);
6597 }
6598 // We check super class after class file is parsed and format is checked
6599 if (_super_class_index > 0 && NULL ==_super_klass) {
6600 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6601 if (_access_flags.is_interface()) {
6602 // Before attempting to resolve the superclass, check for class format
6603 // errors not checked yet.
6604 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6605 "Interfaces must have java.lang.Object as superclass in class file %s",
6606 CHECK);
6607 }
6608 Handle loader(THREAD, _loader_data->class_loader());
6609 _super_klass = (const InstanceKlass*)
6610 SystemDictionary::resolve_super_or_fail(_class_name,
6611 super_class_name,
6612 loader,
6613 _protection_domain,
6614 true,
6615 CHECK);
6616 }
6617
6618 if (_super_klass != NULL) {
6619 if (_super_klass->has_nonstatic_concrete_methods()) {
6620 _has_nonstatic_concrete_methods = true;
6621 }
6622
6623 if (_super_klass->is_interface()) {
6624 ResourceMark rm(THREAD);
6625 Exceptions::fthrow(
6626 THREAD_AND_LOCATION,
6627 vmSymbols::java_lang_IncompatibleClassChangeError(),
6628 "class %s has interface %s as super class",
6629 _class_name->as_klass_external_name(),
6630 _super_klass->external_name()
6631 );
6632 return;
6633 }
6634 }
6635
6636 // Compute the transitive list of all unique interfaces implemented by this class
6637 _transitive_interfaces =
6638 compute_transitive_interfaces(_super_klass,
6639 _local_interfaces,
6640 _loader_data,
6641 CHECK);
6642
6643 assert(_transitive_interfaces != NULL, "invariant");
6644
6645 // sort methods
6646 _method_ordering = sort_methods(_methods);
6647
6648 _all_mirandas = new GrowableArray<Method*>(20);
6649
6650 Handle loader(THREAD, _loader_data->class_loader());
6651 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6652 &_num_miranda_methods,
6653 _all_mirandas,
6654 _super_klass,
6655 _methods,
6656 _access_flags,
6657 _major_version,
6658 loader,
6659 _class_name,
6660 _local_interfaces,
6661 CHECK);
6662
6663 // Size of Java itable (in words)
6664 _itable_size = _access_flags.is_interface() ? 0 :
6665 klassItable::compute_itable_size(_transitive_interfaces);
6666
6667 assert(_fac != NULL, "invariant");
6668 assert(_parsed_annotations != NULL, "invariant");
6669
6670 _field_info = new FieldLayoutInfo();
6671 if (UseNewFieldLayout) {
6672 FieldLayoutBuilder lb(class_name(), super_klass(), _cp, _fields,
6673 _parsed_annotations->is_contended(), _field_info);
6674 lb.build_layout();
6675 } else {
6676 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6677 }
6678
6679 // Compute reference typ
6680 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6681
6682 }
6683
6684 void ClassFileParser::set_klass(InstanceKlass* klass) {
6685
6686 #ifdef ASSERT
6687 if (klass != NULL) {
6688 assert(NULL == _klass, "leaking?");
6689 }
6690 #endif
6691
6692 _klass = klass;
6693 }
6694
6695 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6696
6697 #ifdef ASSERT
6698 if (klass != NULL) {
6699 assert(NULL == _klass_to_deallocate, "leaking?");
6700 }
6701 #endif
6702
6703 _klass_to_deallocate = klass;
6704 }
6705
6706 // Caller responsible for ResourceMark
6707 // clone stream with rewound position
6708 const ClassFileStream* ClassFileParser::clone_stream() const {
6709 assert(_stream != NULL, "invariant");
6710
6711 return _stream->clone();
6712 }
6713 // ----------------------------------------------------------------------------
6714 // debugging
6715
6716 #ifdef ASSERT
6717
6718 // return true if class_name contains no '.' (internal format is '/')
6719 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6720 if (class_name != NULL) {
6721 ResourceMark rm;
6722 char* name = class_name->as_C_string();
6723 return strchr(name, JVM_SIGNATURE_DOT) == NULL;
6724 } else {
6725 return true;
6726 }
6727 }
6728
6729 #endif