1 /*
2 * Copyright (c) 1997, 2019, 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/javaClasses.inline.hpp"
34 #include "classfile/moduleEntry.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/verificationType.hpp"
39 #include "classfile/verifier.hpp"
40 #include "classfile/vmSymbols.hpp"
41 #include "logging/log.hpp"
42 #include "logging/logStream.hpp"
43 #include "memory/allocation.hpp"
44 #include "memory/metadataFactory.hpp"
45 #include "memory/oopFactory.hpp"
46 #include "memory/resourceArea.hpp"
47 #include "memory/universe.hpp"
48 #include "oops/annotations.hpp"
49 #include "oops/constantPool.inline.hpp"
50 #include "oops/fieldStreams.hpp"
51 #include "oops/instanceKlass.hpp"
52 #include "oops/instanceMirrorKlass.hpp"
53 #include "oops/klass.inline.hpp"
54 #include "oops/klassVtable.hpp"
55 #include "oops/metadata.hpp"
56 #include "oops/method.inline.hpp"
57 #include "oops/oop.inline.hpp"
58 #include "oops/symbol.hpp"
59 #include "oops/valueKlass.hpp"
60 #include "prims/jvmtiExport.hpp"
61 #include "prims/jvmtiThreadState.hpp"
62 #include "runtime/arguments.hpp"
63 #include "runtime/handles.inline.hpp"
64 #include "runtime/javaCalls.hpp"
65 #include "runtime/os.hpp"
66 #include "runtime/perfData.hpp"
67 #include "runtime/reflection.hpp"
68 #include "runtime/safepointVerifiers.hpp"
69 #include "runtime/signature.hpp"
70 #include "runtime/timer.hpp"
71 #include "services/classLoadingService.hpp"
72 #include "services/threadService.hpp"
73 #include "utilities/align.hpp"
74 #include "utilities/bitMap.inline.hpp"
75 #include "utilities/copy.hpp"
76 #include "utilities/exceptions.hpp"
77 #include "utilities/globalDefinitions.hpp"
78 #include "utilities/growableArray.hpp"
79 #include "utilities/macros.hpp"
80 #include "utilities/ostream.hpp"
81 #include "utilities/resourceHash.hpp"
82 #include "utilities/utf8.hpp"
83
84 #if INCLUDE_CDS
85 #include "classfile/systemDictionaryShared.hpp"
86 #endif
87 #if INCLUDE_JFR
88 #include "jfr/support/jfrTraceIdExtension.hpp"
89 #endif
90
91 // We generally try to create the oops directly when parsing, rather than
92 // allocating temporary data structures and copying the bytes twice. A
93 // temporary area is only needed when parsing utf8 entries in the constant
94 // pool and when parsing line number tables.
95
96 // We add assert in debug mode when class format is not checked.
97
98 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
99 #define JAVA_MIN_SUPPORTED_VERSION 45
100 #define JAVA_PREVIEW_MINOR_VERSION 65535
101
102 // Used for two backward compatibility reasons:
103 // - to check for new additions to the class file format in JDK1.5
104 // - to check for bug fixes in the format checker in JDK1.5
105 #define JAVA_1_5_VERSION 49
106
107 // Used for backward compatibility reasons:
108 // - to check for javac bug fixes that happened after 1.5
109 // - also used as the max version when running in jdk6
110 #define JAVA_6_VERSION 50
111
112 // Used for backward compatibility reasons:
113 // - to disallow argument and require ACC_STATIC for <clinit> methods
114 #define JAVA_7_VERSION 51
115
116 // Extension method support.
117 #define JAVA_8_VERSION 52
118
119 #define JAVA_9_VERSION 53
120
121 #define JAVA_10_VERSION 54
122
123 #define JAVA_11_VERSION 55
124
125 #define JAVA_12_VERSION 56
126
127 #define JAVA_13_VERSION 57
128
129 #define CONSTANT_CLASS_DESCRIPTORS 57
130
131 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
132 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION,
133 "Unexpected bad constant pool entry");
134 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
135 }
136
137 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
138 ConstantPool* cp,
139 const int length,
140 TRAPS) {
141 assert(stream != NULL, "invariant");
142 assert(cp != NULL, "invariant");
143
144 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
145 // this function (_current can be allocated in a register, with scalar
146 // replacement of aggregates). The _current pointer is copied back to
147 // stream() when this function returns. DON'T call another method within
148 // this method that uses stream().
149 const ClassFileStream cfs1 = *stream;
150 const ClassFileStream* const cfs = &cfs1;
151
152 assert(cfs->allocated_on_stack(), "should be local");
153 debug_only(const u1* const old_current = stream->current();)
154
155 // Used for batching symbol allocations.
156 const char* names[SymbolTable::symbol_alloc_batch_size];
157 int lengths[SymbolTable::symbol_alloc_batch_size];
158 int indices[SymbolTable::symbol_alloc_batch_size];
159 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
160 int names_count = 0;
161
162 // parsing Index 0 is unused
163 for (int index = 1; index < length; index++) {
164 // Each of the following case guarantees one more byte in the stream
165 // for the following tag or the access_flags following constant pool,
166 // so we don't need bounds-check for reading tag.
167 const u1 tag = cfs->get_u1_fast();
168 switch (tag) {
169 case JVM_CONSTANT_Class: {
170 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
171 const u2 name_index = cfs->get_u2_fast();
172 cp->klass_index_at_put(index, name_index);
173 break;
174 }
175 case JVM_CONSTANT_Fieldref: {
176 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
177 const u2 class_index = cfs->get_u2_fast();
178 const u2 name_and_type_index = cfs->get_u2_fast();
179 cp->field_at_put(index, class_index, name_and_type_index);
180 break;
181 }
182 case JVM_CONSTANT_Methodref: {
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->method_at_put(index, class_index, name_and_type_index);
187 break;
188 }
189 case JVM_CONSTANT_InterfaceMethodref: {
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->interface_method_at_put(index, class_index, name_and_type_index);
194 break;
195 }
196 case JVM_CONSTANT_String : {
197 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
198 const u2 string_index = cfs->get_u2_fast();
199 cp->string_index_at_put(index, string_index);
200 break;
201 }
202 case JVM_CONSTANT_MethodHandle :
203 case JVM_CONSTANT_MethodType: {
204 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
205 classfile_parse_error(
206 "Class file version does not support constant tag %u in class file %s",
207 tag, CHECK);
208 }
209 if (tag == JVM_CONSTANT_MethodHandle) {
210 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
211 const u1 ref_kind = cfs->get_u1_fast();
212 const u2 method_index = cfs->get_u2_fast();
213 cp->method_handle_index_at_put(index, ref_kind, method_index);
214 }
215 else if (tag == JVM_CONSTANT_MethodType) {
216 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
217 const u2 signature_index = cfs->get_u2_fast();
218 cp->method_type_index_at_put(index, signature_index);
219 }
220 else {
221 ShouldNotReachHere();
222 }
223 break;
224 }
225 case JVM_CONSTANT_Dynamic : {
226 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
227 classfile_parse_error(
228 "Class file version does not support constant tag %u in class file %s",
229 tag, CHECK);
230 }
231 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
232 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
233 const u2 name_and_type_index = cfs->get_u2_fast();
234 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
235 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
236 }
237 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
238 break;
239 }
240 case JVM_CONSTANT_InvokeDynamic : {
241 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
242 classfile_parse_error(
243 "Class file version does not support constant tag %u in class file %s",
244 tag, CHECK);
245 }
246 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
247 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
248 const u2 name_and_type_index = cfs->get_u2_fast();
249 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
250 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
251 }
252 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
253 break;
254 }
255 case JVM_CONSTANT_Integer: {
256 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
257 const u4 bytes = cfs->get_u4_fast();
258 cp->int_at_put(index, (jint)bytes);
259 break;
260 }
261 case JVM_CONSTANT_Float: {
262 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
263 const u4 bytes = cfs->get_u4_fast();
264 cp->float_at_put(index, *(jfloat*)&bytes);
265 break;
266 }
267 case JVM_CONSTANT_Long: {
268 // A mangled type might cause you to overrun allocated memory
269 guarantee_property(index + 1 < length,
270 "Invalid constant pool entry %u in class file %s",
271 index,
272 CHECK);
273 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
274 const u8 bytes = cfs->get_u8_fast();
275 cp->long_at_put(index, bytes);
276 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
277 break;
278 }
279 case JVM_CONSTANT_Double: {
280 // A mangled type might cause you to overrun allocated memory
281 guarantee_property(index+1 < length,
282 "Invalid constant pool entry %u in class file %s",
283 index,
284 CHECK);
285 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
286 const u8 bytes = cfs->get_u8_fast();
287 cp->double_at_put(index, *(jdouble*)&bytes);
288 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
289 break;
290 }
291 case JVM_CONSTANT_NameAndType: {
292 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
293 const u2 name_index = cfs->get_u2_fast();
294 const u2 signature_index = cfs->get_u2_fast();
295 cp->name_and_type_at_put(index, name_index, signature_index);
296 break;
297 }
298 case JVM_CONSTANT_Utf8 : {
299 cfs->guarantee_more(2, CHECK); // utf8_length
300 u2 utf8_length = cfs->get_u2_fast();
301 const u1* utf8_buffer = cfs->current();
302 assert(utf8_buffer != NULL, "null utf8 buffer");
303 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
304 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
305 cfs->skip_u1_fast(utf8_length);
306
307 // Before storing the symbol, make sure it's legal
308 if (_need_verify) {
309 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
310 }
311
312 if (has_cp_patch_at(index)) {
313 Handle patch = clear_cp_patch_at(index);
314 guarantee_property(java_lang_String::is_instance(patch()),
315 "Illegal utf8 patch at %d in class file %s",
316 index,
317 CHECK);
318 const char* const str = java_lang_String::as_utf8_string(patch());
319 // (could use java_lang_String::as_symbol instead, but might as well batch them)
320 utf8_buffer = (const u1*) str;
321 utf8_length = (u2) strlen(str);
322 }
323
324 unsigned int hash;
325 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
326 utf8_length,
327 hash);
328 if (result == NULL) {
329 names[names_count] = (const char*)utf8_buffer;
330 lengths[names_count] = utf8_length;
331 indices[names_count] = index;
332 hashValues[names_count++] = hash;
333 if (names_count == SymbolTable::symbol_alloc_batch_size) {
334 SymbolTable::new_symbols(_loader_data,
335 cp,
336 names_count,
337 names,
338 lengths,
339 indices,
340 hashValues,
341 CHECK);
342 names_count = 0;
343 }
344 } else {
345 cp->symbol_at_put(index, result);
346 }
347 break;
348 }
349 case 19:
350 case 20: {
351 // Record that an error occurred in these two cases but keep parsing so
352 // that ACC_Module can be checked for in the access_flags. Need to
353 // throw NoClassDefFoundError in that case.
354 if (_major_version >= JAVA_9_VERSION) {
355 cfs->guarantee_more(3, CHECK);
356 cfs->get_u2_fast();
357 set_class_bad_constant_seen(tag);
358 break;
359 }
360 }
361 default: {
362 classfile_parse_error("Unknown constant tag %u in class file %s",
363 tag,
364 CHECK);
365 break;
366 }
367 } // end of switch(tag)
368 } // end of for
369
370 // Allocate the remaining symbols
371 if (names_count > 0) {
372 SymbolTable::new_symbols(_loader_data,
373 cp,
374 names_count,
375 names,
376 lengths,
377 indices,
378 hashValues,
379 CHECK);
380 }
381
382 // Copy _current pointer of local copy back to stream.
383 assert(stream->current() == old_current, "non-exclusive use of stream");
384 stream->set_current(cfs1.current());
385
386 }
387
388 static inline bool valid_cp_range(int index, int length) {
389 return (index > 0 && index < length);
390 }
391
392 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
393 assert(cp != NULL, "invariant");
394 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
395 return cp->symbol_at(index);
396 }
397 return NULL;
398 }
399
400 #ifdef ASSERT
401 PRAGMA_DIAG_PUSH
402 PRAGMA_FORMAT_NONLITERAL_IGNORED
403 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
404 ResourceMark rm(THREAD);
405 fatal(msg, _class_name->as_C_string());
406 }
407
408 void ClassFileParser::report_assert_property_failure(const char* msg,
409 int index,
410 TRAPS) const {
411 ResourceMark rm(THREAD);
412 fatal(msg, index, _class_name->as_C_string());
413 }
414 PRAGMA_DIAG_POP
415 #endif
416
417 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
418 ConstantPool* const cp,
419 const int length,
420 TRAPS) {
421 assert(cp != NULL, "invariant");
422 assert(stream != NULL, "invariant");
423
424 // parsing constant pool entries
425 parse_constant_pool_entries(stream, cp, length, CHECK);
426 if (class_bad_constant_seen() != 0) {
427 // a bad CP entry has been detected previously so stop parsing and just return.
428 return;
429 }
430
431 int index = 1; // declared outside of loops for portability
432 int num_klasses = 0;
433
434 // first verification pass - validate cross references
435 // and fixup class and string constants
436 for (index = 1; index < length; index++) { // Index 0 is unused
437 const jbyte tag = cp->tag_at(index).value();
438 switch (tag) {
439 case JVM_CONSTANT_Class: {
440 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
441 break;
442 }
443 case JVM_CONSTANT_Fieldref:
444 // fall through
445 case JVM_CONSTANT_Methodref:
446 // fall through
447 case JVM_CONSTANT_InterfaceMethodref: {
448 if (!_need_verify) break;
449 const int klass_ref_index = cp->klass_ref_index_at(index);
450 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
451 check_property(valid_klass_reference_at(klass_ref_index),
452 "Invalid constant pool index %u in class file %s",
453 klass_ref_index, CHECK);
454 check_property(valid_cp_range(name_and_type_ref_index, length) &&
455 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
456 "Invalid constant pool index %u in class file %s",
457 name_and_type_ref_index, CHECK);
458 break;
459 }
460 case JVM_CONSTANT_String: {
461 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
462 break;
463 }
464 case JVM_CONSTANT_Integer:
465 break;
466 case JVM_CONSTANT_Float:
467 break;
468 case JVM_CONSTANT_Long:
469 case JVM_CONSTANT_Double: {
470 index++;
471 check_property(
472 (index < length && cp->tag_at(index).is_invalid()),
473 "Improper constant pool long/double index %u in class file %s",
474 index, CHECK);
475 break;
476 }
477 case JVM_CONSTANT_NameAndType: {
478 if (!_need_verify) break;
479 const int name_ref_index = cp->name_ref_index_at(index);
480 const int signature_ref_index = cp->signature_ref_index_at(index);
481 check_property(valid_symbol_at(name_ref_index),
482 "Invalid constant pool index %u in class file %s",
483 name_ref_index, CHECK);
484 check_property(valid_symbol_at(signature_ref_index),
485 "Invalid constant pool index %u in class file %s",
486 signature_ref_index, CHECK);
487 break;
488 }
489 case JVM_CONSTANT_Utf8:
490 break;
491 case JVM_CONSTANT_UnresolvedClass: // fall-through
492 case JVM_CONSTANT_UnresolvedClassInError: {
493 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
494 break;
495 }
496 case JVM_CONSTANT_ClassIndex: {
497 const int class_index = cp->klass_index_at(index);
498 check_property(valid_symbol_at(class_index),
499 "Invalid constant pool index %u in class file %s",
500 class_index, CHECK);
501
502 Symbol* const name = cp->symbol_at(class_index);
503 const unsigned int name_len = name->utf8_length();
504 if (name->is_Q_signature()) {
505 cp->unresolved_qdescriptor_at_put(index, class_index, num_klasses++);
506 } else {
507 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
508 }
509 break;
510 }
511 case JVM_CONSTANT_StringIndex: {
512 const int string_index = cp->string_index_at(index);
513 check_property(valid_symbol_at(string_index),
514 "Invalid constant pool index %u in class file %s",
515 string_index, CHECK);
516 Symbol* const sym = cp->symbol_at(string_index);
517 cp->unresolved_string_at_put(index, sym);
518 break;
519 }
520 case JVM_CONSTANT_MethodHandle: {
521 const int ref_index = cp->method_handle_index_at(index);
522 check_property(valid_cp_range(ref_index, length),
523 "Invalid constant pool index %u in class file %s",
524 ref_index, CHECK);
525 const constantTag tag = cp->tag_at(ref_index);
526 const int ref_kind = cp->method_handle_ref_kind_at(index);
527
528 switch (ref_kind) {
529 case JVM_REF_getField:
530 case JVM_REF_getStatic:
531 case JVM_REF_putField:
532 case JVM_REF_putStatic: {
533 check_property(
534 tag.is_field(),
535 "Invalid constant pool index %u in class file %s (not a field)",
536 ref_index, CHECK);
537 break;
538 }
539 case JVM_REF_invokeVirtual:
540 case JVM_REF_newInvokeSpecial: {
541 check_property(
542 tag.is_method(),
543 "Invalid constant pool index %u in class file %s (not a method)",
544 ref_index, CHECK);
545 break;
546 }
547 case JVM_REF_invokeStatic:
548 case JVM_REF_invokeSpecial: {
549 check_property(
550 tag.is_method() ||
551 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
552 "Invalid constant pool index %u in class file %s (not a method)",
553 ref_index, CHECK);
554 break;
555 }
556 case JVM_REF_invokeInterface: {
557 check_property(
558 tag.is_interface_method(),
559 "Invalid constant pool index %u in class file %s (not an interface method)",
560 ref_index, CHECK);
561 break;
562 }
563 default: {
564 classfile_parse_error(
565 "Bad method handle kind at constant pool index %u in class file %s",
566 index, CHECK);
567 }
568 } // switch(refkind)
569 // Keep the ref_index unchanged. It will be indirected at link-time.
570 break;
571 } // case MethodHandle
572 case JVM_CONSTANT_MethodType: {
573 const int ref_index = cp->method_type_index_at(index);
574 check_property(valid_symbol_at(ref_index),
575 "Invalid constant pool index %u in class file %s",
576 ref_index, CHECK);
577 break;
578 }
579 case JVM_CONSTANT_Dynamic: {
580 const int name_and_type_ref_index =
581 cp->bootstrap_name_and_type_ref_index_at(index);
582
583 check_property(valid_cp_range(name_and_type_ref_index, length) &&
584 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
585 "Invalid constant pool index %u in class file %s",
586 name_and_type_ref_index, CHECK);
587 // bootstrap specifier index must be checked later,
588 // when BootstrapMethods attr is available
589
590 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
591 cp->set_has_dynamic_constant();
592 break;
593 }
594 case JVM_CONSTANT_InvokeDynamic: {
595 const int name_and_type_ref_index =
596 cp->bootstrap_name_and_type_ref_index_at(index);
597
598 check_property(valid_cp_range(name_and_type_ref_index, length) &&
599 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
600 "Invalid constant pool index %u in class file %s",
601 name_and_type_ref_index, CHECK);
602 // bootstrap specifier index must be checked later,
603 // when BootstrapMethods attr is available
604 break;
605 }
606 default: {
607 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
608 ShouldNotReachHere();
609 break;
610 }
611 } // switch(tag)
612 } // end of for
613
614 _first_patched_klass_resolved_index = num_klasses;
615 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
616
617 if (_cp_patches != NULL) {
618 // need to treat this_class specially...
619
620 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
621 // for now. These will be replaced with actual names of the patched classes in patch_class().
622 Symbol* s = vmSymbols::star_name();
623 for (int n=_orig_cp_size; n<cp->length(); n++) {
624 cp->symbol_at_put(n, s);
625 }
626
627 int this_class_index;
628 {
629 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
630 const u1* const mark = stream->current();
631 stream->skip_u2_fast(1); // skip flags
632 this_class_index = stream->get_u2_fast();
633 stream->set_current(mark); // revert to mark
634 }
635
636 for (index = 1; index < length; index++) { // Index 0 is unused
637 if (has_cp_patch_at(index)) {
638 guarantee_property(index != this_class_index,
639 "Illegal constant pool patch to self at %d in class file %s",
640 index, CHECK);
641 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
642 }
643 }
644 }
645
646 if (!_need_verify) {
647 return;
648 }
649
650 // second verification pass - checks the strings are of the right format.
651 // but not yet to the other entries
652 for (index = 1; index < length; index++) {
653 const jbyte tag = cp->tag_at(index).value();
654 switch (tag) {
655 case JVM_CONSTANT_UnresolvedClass: {
656 const Symbol* const class_name = cp->klass_name_at(index);
657 // check the name, even if _cp_patches will overwrite it
658 verify_legal_class_name(class_name, CHECK);
659 break;
660 }
661 case JVM_CONSTANT_NameAndType: {
662 if (_need_verify) {
663 const int sig_index = cp->signature_ref_index_at(index);
664 const int name_index = cp->name_ref_index_at(index);
665 const Symbol* const name = cp->symbol_at(name_index);
666 const Symbol* const sig = cp->symbol_at(sig_index);
667 guarantee_property(sig->utf8_length() != 0,
668 "Illegal zero length constant pool entry at %d in class %s",
669 sig_index, CHECK);
670 guarantee_property(name->utf8_length() != 0,
671 "Illegal zero length constant pool entry at %d in class %s",
672 name_index, CHECK);
673
674 if (sig->char_at(0) == JVM_SIGNATURE_FUNC) {
675 // Format check method name and signature
676 verify_legal_method_name(name, CHECK);
677 verify_legal_method_signature(name, sig, CHECK);
678 } else {
679 // Format check field name and signature
680 verify_legal_field_name(name, CHECK);
681 verify_legal_field_signature(name, sig, CHECK);
682 }
683 }
684 break;
685 }
686 case JVM_CONSTANT_Dynamic: {
687 const int name_and_type_ref_index =
688 cp->name_and_type_ref_index_at(index);
689 // already verified to be utf8
690 const int name_ref_index =
691 cp->name_ref_index_at(name_and_type_ref_index);
692 // already verified to be utf8
693 const int signature_ref_index =
694 cp->signature_ref_index_at(name_and_type_ref_index);
695 const Symbol* const name = cp->symbol_at(name_ref_index);
696 const Symbol* const signature = cp->symbol_at(signature_ref_index);
697 if (_need_verify) {
698 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
699 // Need only to be sure signature is non-zero length and the right type.
700 if (signature->utf8_length() == 0 ||
701 signature->char_at(0) == JVM_SIGNATURE_FUNC) {
702 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
703 }
704 }
705 break;
706 }
707 case JVM_CONSTANT_InvokeDynamic:
708 case JVM_CONSTANT_Fieldref:
709 case JVM_CONSTANT_Methodref:
710 case JVM_CONSTANT_InterfaceMethodref: {
711 const int name_and_type_ref_index =
712 cp->name_and_type_ref_index_at(index);
713 // already verified to be utf8
714 const int name_ref_index =
715 cp->name_ref_index_at(name_and_type_ref_index);
716 // already verified to be utf8
717 const int signature_ref_index =
718 cp->signature_ref_index_at(name_and_type_ref_index);
719 const Symbol* const name = cp->symbol_at(name_ref_index);
720 const Symbol* const signature = cp->symbol_at(signature_ref_index);
721 if (tag == JVM_CONSTANT_Fieldref) {
722 if (_need_verify) {
723 // Field name and signature are verified above, when iterating NameAndType_info.
724 // Need only to be sure signature is non-zero length and the right type.
725 if (signature->utf8_length() == 0 ||
726 signature->char_at(0) == JVM_SIGNATURE_FUNC) {
727 throwIllegalSignature("Field", name, signature, CHECK);
728 }
729 }
730 } else {
731 if (_need_verify) {
732 // Method name and signature are verified above, when iterating NameAndType_info.
733 // Need only to be sure signature is non-zero length and the right type.
734 if (signature->utf8_length() == 0 ||
735 signature->char_at(0) != JVM_SIGNATURE_FUNC) {
736 throwIllegalSignature("Method", name, signature, CHECK);
737 }
738 }
739 // 4509014: If a class method name begins with '<', it must be "<init>"
740 const unsigned int name_len = name->utf8_length();
741 if (tag == JVM_CONSTANT_Methodref &&
742 name_len != 0 &&
743 name->char_at(0) == '<' &&
744 name != vmSymbols::object_initializer_name()) {
745 classfile_parse_error(
746 "Bad method name at constant pool index %u in class file %s",
747 name_ref_index, CHECK);
748 }
749 }
750 break;
751 }
752 case JVM_CONSTANT_MethodHandle: {
753 const int ref_index = cp->method_handle_index_at(index);
754 const int ref_kind = cp->method_handle_ref_kind_at(index);
755 switch (ref_kind) {
756 case JVM_REF_invokeVirtual:
757 case JVM_REF_invokeStatic:
758 case JVM_REF_invokeSpecial:
759 case JVM_REF_newInvokeSpecial: {
760 const int name_and_type_ref_index =
761 cp->name_and_type_ref_index_at(ref_index);
762 const int name_ref_index =
763 cp->name_ref_index_at(name_and_type_ref_index);
764 const Symbol* const name = cp->symbol_at(name_ref_index);
765 if (ref_kind == JVM_REF_newInvokeSpecial) {
766 if (name != vmSymbols::object_initializer_name()) {
767 classfile_parse_error(
768 "Bad constructor name at constant pool index %u in class file %s",
769 name_ref_index, CHECK);
770 }
771 } else {
772 if (name == vmSymbols::object_initializer_name()) {
773 classfile_parse_error(
774 "Bad method name at constant pool index %u in class file %s",
775 name_ref_index, CHECK);
776 }
777 }
778 break;
779 }
780 // Other ref_kinds are already fully checked in previous pass.
781 } // switch(ref_kind)
782 break;
783 }
784 case JVM_CONSTANT_MethodType: {
785 const Symbol* const no_name = vmSymbols::type_name(); // place holder
786 const Symbol* const signature = cp->method_type_signature_at(index);
787 verify_legal_method_signature(no_name, signature, CHECK);
788 break;
789 }
790 case JVM_CONSTANT_Utf8: {
791 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
792 }
793 } // switch(tag)
794 } // end of for
795 }
796
797 Handle ClassFileParser::clear_cp_patch_at(int index) {
798 Handle patch = cp_patch_at(index);
799 _cp_patches->at_put(index, Handle());
800 assert(!has_cp_patch_at(index), "");
801 return patch;
802 }
803
804 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
805 int name_index = _orig_cp_size + _num_patched_klasses;
806 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
807
808 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
809 _num_patched_klasses ++;
810 }
811
812 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
813 int index,
814 Handle patch,
815 TRAPS) {
816 assert(cp != NULL, "invariant");
817
818 BasicType patch_type = T_VOID;
819
820 switch (cp->tag_at(index).value()) {
821
822 case JVM_CONSTANT_UnresolvedClass: {
823 // Patching a class means pre-resolving it.
824 // The name in the constant pool is ignored.
825 if (java_lang_Class::is_instance(patch())) {
826 guarantee_property(!java_lang_Class::is_primitive(patch()),
827 "Illegal class patch at %d in class file %s",
828 index, CHECK);
829 Klass* k = java_lang_Class::as_Klass(patch());
830 patch_class(cp, index, k, k->name());
831 } else {
832 guarantee_property(java_lang_String::is_instance(patch()),
833 "Illegal class patch at %d in class file %s",
834 index, CHECK);
835 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK);
836 patch_class(cp, index, NULL, name);
837 }
838 break;
839 }
840
841 case JVM_CONSTANT_String: {
842 // skip this patch and don't clear it. Needs the oop array for resolved
843 // references to be created first.
844 return;
845 }
846 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
847 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
848 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
849 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
850 patch_prim:
851 {
852 jvalue value;
853 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
854 guarantee_property(value_type == patch_type,
855 "Illegal primitive patch at %d in class file %s",
856 index, CHECK);
857 switch (value_type) {
858 case T_INT: cp->int_at_put(index, value.i); break;
859 case T_FLOAT: cp->float_at_put(index, value.f); break;
860 case T_LONG: cp->long_at_put(index, value.j); break;
861 case T_DOUBLE: cp->double_at_put(index, value.d); break;
862 default: assert(false, "");
863 }
864 } // end patch_prim label
865 break;
866
867 default: {
868 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
869 guarantee_property(!has_cp_patch_at(index),
870 "Illegal unexpected patch at %d in class file %s",
871 index, CHECK);
872 return;
873 }
874 } // end of switch(tag)
875
876 // On fall-through, mark the patch as used.
877 clear_cp_patch_at(index);
878 }
879 class NameSigHash: public ResourceObj {
880 public:
881 const Symbol* _name; // name
882 const Symbol* _sig; // signature
883 NameSigHash* _next; // Next entry in hash table
884 };
885
886 static const int HASH_ROW_SIZE = 256;
887
888 static unsigned int hash(const Symbol* name, const Symbol* sig) {
889 unsigned int raw_hash = 0;
890 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
891 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
892
893 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
894 }
895
896
897 static void initialize_hashtable(NameSigHash** table) {
898 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
899 }
900 // Return false if the name/sig combination is found in table.
901 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
902 // The old format checker uses heap sort to find duplicates.
903 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
904 // of table since we don't expect Symbol*'s to move.
905 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
906 assert(name != NULL, "name in constant pool is NULL");
907
908 // First lookup for duplicates
909 int index = hash(name, sig);
910 NameSigHash* entry = table[index];
911 while (entry != NULL) {
912 if (entry->_name == name && entry->_sig == sig) {
913 return false;
914 }
915 entry = entry->_next;
916 }
917
918 // No duplicate is found, allocate a new entry and fill it.
919 entry = new NameSigHash();
920 entry->_name = name;
921 entry->_sig = sig;
922
923 // Insert into hash table
924 entry->_next = table[index];
925 table[index] = entry;
926
927 return true;
928 }
929
930 // Side-effects: populates the _local_interfaces field
931 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
932 const int itfs_len,
933 ConstantPool* const cp,
934 bool* const has_nonstatic_concrete_methods,
935 TRAPS) {
936 assert(stream != NULL, "invariant");
937 assert(cp != NULL, "invariant");
938 assert(has_nonstatic_concrete_methods != NULL, "invariant");
939
940 if (itfs_len == 0) {
941 _local_interfaces = Universe::the_empty_instance_klass_array();
942 } else {
943 assert(itfs_len > 0, "only called for len>0");
944 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
945
946 int index;
947 for (index = 0; index < itfs_len; index++) {
948 const u2 interface_index = stream->get_u2(CHECK);
949 Klass* interf;
950 check_property(
951 valid_klass_reference_at(interface_index),
952 "Interface name has bad constant pool index %u in class file %s",
953 interface_index, CHECK);
954 if (cp->tag_at(interface_index).is_klass()) {
955 interf = cp->resolved_klass_at(interface_index);
956 } else {
957 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
958
959 // Don't need to check legal name because it's checked when parsing constant pool.
960 // But need to make sure it's not an array type.
961 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
962 "Bad interface name in class file %s", CHECK);
963
964 // Call resolve_super so classcircularity is checked
965 interf = SystemDictionary::resolve_super_or_fail(
966 _class_name,
967 unresolved_klass,
968 Handle(THREAD, _loader_data->class_loader()),
969 _protection_domain,
970 false,
971 CHECK);
972 }
973
974 if (!interf->is_interface()) {
975 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
976 err_msg("class %s can not implement %s, because it is not an interface (%s)",
977 _class_name->as_klass_external_name(),
978 interf->external_name(),
979 interf->class_in_module_of_loader()));
980 }
981
982 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
983 *has_nonstatic_concrete_methods = true;
984 }
985 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
986 }
987
988 if (!_need_verify || itfs_len <= 1) {
989 return;
990 }
991
992 // Check if there's any duplicates in interfaces
993 ResourceMark rm(THREAD);
994 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
995 NameSigHash*,
996 HASH_ROW_SIZE);
997 initialize_hashtable(interface_names);
998 bool dup = false;
999 const Symbol* name = NULL;
1000 {
1001 debug_only(NoSafepointVerifier nsv;)
1002 for (index = 0; index < itfs_len; index++) {
1003 const InstanceKlass* const k = _local_interfaces->at(index);
1004 name = k->name();
1005 // If no duplicates, add (name, NULL) in hashtable interface_names.
1006 if (!put_after_lookup(name, NULL, interface_names)) {
1007 dup = true;
1008 break;
1009 }
1010 }
1011 }
1012 if (dup) {
1013 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
1014 name->as_C_string(), CHECK);
1015 }
1016 }
1017 }
1018
1019 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
1020 int constantvalue_index,
1021 int signature_index,
1022 TRAPS) const {
1023 // Make sure the constant pool entry is of a type appropriate to this field
1024 guarantee_property(
1025 (constantvalue_index > 0 &&
1026 constantvalue_index < cp->length()),
1027 "Bad initial value index %u in ConstantValue attribute in class file %s",
1028 constantvalue_index, CHECK);
1029
1030 const constantTag value_type = cp->tag_at(constantvalue_index);
1031 switch(cp->basic_type_for_signature_at(signature_index)) {
1032 case T_LONG: {
1033 guarantee_property(value_type.is_long(),
1034 "Inconsistent constant value type in class file %s",
1035 CHECK);
1036 break;
1037 }
1038 case T_FLOAT: {
1039 guarantee_property(value_type.is_float(),
1040 "Inconsistent constant value type in class file %s",
1041 CHECK);
1042 break;
1043 }
1044 case T_DOUBLE: {
1045 guarantee_property(value_type.is_double(),
1046 "Inconsistent constant value type in class file %s",
1047 CHECK);
1048 break;
1049 }
1050 case T_BYTE:
1051 case T_CHAR:
1052 case T_SHORT:
1053 case T_BOOLEAN:
1054 case T_INT: {
1055 guarantee_property(value_type.is_int(),
1056 "Inconsistent constant value type in class file %s",
1057 CHECK);
1058 break;
1059 }
1060 case T_OBJECT: {
1061 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1062 && value_type.is_string()),
1063 "Bad string initial value in class file %s",
1064 CHECK);
1065 break;
1066 }
1067 default: {
1068 classfile_parse_error("Unable to set initial value %u in class file %s",
1069 constantvalue_index,
1070 CHECK);
1071 }
1072 }
1073 }
1074
1075 class AnnotationCollector : public ResourceObj{
1076 public:
1077 enum Location { _in_field, _in_method, _in_class };
1078 enum ID {
1079 _unknown = 0,
1080 _method_CallerSensitive,
1081 _method_ForceInline,
1082 _method_DontInline,
1083 _method_InjectedProfile,
1084 _method_LambdaForm_Compiled,
1085 _method_Hidden,
1086 _method_HotSpotIntrinsicCandidate,
1087 _jdk_internal_vm_annotation_Contended,
1088 _field_Stable,
1089 _jdk_internal_vm_annotation_ReservedStackAccess,
1090 _annotation_LIMIT
1091 };
1092 const Location _location;
1093 int _annotations_present;
1094 u2 _contended_group;
1095
1096 AnnotationCollector(Location location)
1097 : _location(location), _annotations_present(0)
1098 {
1099 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1100 }
1101 // If this annotation name has an ID, report it (or _none).
1102 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1103 // Set the annotation name:
1104 void set_annotation(ID id) {
1105 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1106 _annotations_present |= nth_bit((int)id);
1107 }
1108
1109 void remove_annotation(ID id) {
1110 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1111 _annotations_present &= ~nth_bit((int)id);
1112 }
1113
1114 // Report if the annotation is present.
1115 bool has_any_annotations() const { return _annotations_present != 0; }
1116 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1117
1118 void set_contended_group(u2 group) { _contended_group = group; }
1119 u2 contended_group() const { return _contended_group; }
1120
1121 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1122
1123 void set_stable(bool stable) { set_annotation(_field_Stable); }
1124 bool is_stable() const { return has_annotation(_field_Stable); }
1125 };
1126
1127 // This class also doubles as a holder for metadata cleanup.
1128 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1129 private:
1130 ClassLoaderData* _loader_data;
1131 AnnotationArray* _field_annotations;
1132 AnnotationArray* _field_type_annotations;
1133 public:
1134 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1135 AnnotationCollector(_in_field),
1136 _loader_data(loader_data),
1137 _field_annotations(NULL),
1138 _field_type_annotations(NULL) {}
1139 ~FieldAnnotationCollector();
1140 void apply_to(FieldInfo* f);
1141 AnnotationArray* field_annotations() { return _field_annotations; }
1142 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1143
1144 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1145 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1146 };
1147
1148 class MethodAnnotationCollector : public AnnotationCollector{
1149 public:
1150 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1151 void apply_to(const methodHandle& m);
1152 };
1153
1154 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1155 public:
1156 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1157 void apply_to(InstanceKlass* ik);
1158 };
1159
1160
1161 static int skip_annotation_value(const u1*, int, int); // fwd decl
1162
1163 // Safely increment index by val if does not pass limit
1164 #define SAFE_ADD(index, limit, val) \
1165 if (index >= limit - val) return limit; \
1166 index += val;
1167
1168 // Skip an annotation. Return >=limit if there is any problem.
1169 static int skip_annotation(const u1* buffer, int limit, int index) {
1170 assert(buffer != NULL, "invariant");
1171 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1172 // value := switch (tag:u1) { ... }
1173 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1174 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1175 while (--nmem >= 0 && index < limit) {
1176 SAFE_ADD(index, limit, 2); // skip member
1177 index = skip_annotation_value(buffer, limit, index);
1178 }
1179 return index;
1180 }
1181
1182 // Skip an annotation value. Return >=limit if there is any problem.
1183 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1184 assert(buffer != NULL, "invariant");
1185
1186 // value := switch (tag:u1) {
1187 // case B, C, I, S, Z, D, F, J, c: con:u2;
1188 // case e: e_class:u2 e_name:u2;
1189 // case s: s_con:u2;
1190 // case [: do(nval:u2) {value};
1191 // case @: annotation;
1192 // case s: s_con:u2;
1193 // }
1194 SAFE_ADD(index, limit, 1); // read tag
1195 const u1 tag = buffer[index - 1];
1196 switch (tag) {
1197 case 'B':
1198 case 'C':
1199 case 'I':
1200 case 'S':
1201 case 'Z':
1202 case 'D':
1203 case 'F':
1204 case 'J':
1205 case 'c':
1206 case 's':
1207 SAFE_ADD(index, limit, 2); // skip con or s_con
1208 break;
1209 case 'e':
1210 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1211 break;
1212 case '[':
1213 {
1214 SAFE_ADD(index, limit, 2); // read nval
1215 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1216 while (--nval >= 0 && index < limit) {
1217 index = skip_annotation_value(buffer, limit, index);
1218 }
1219 }
1220 break;
1221 case '@':
1222 index = skip_annotation(buffer, limit, index);
1223 break;
1224 default:
1225 return limit; // bad tag byte
1226 }
1227 return index;
1228 }
1229
1230 // Sift through annotations, looking for those significant to the VM:
1231 static void parse_annotations(const ConstantPool* const cp,
1232 const u1* buffer, int limit,
1233 AnnotationCollector* coll,
1234 ClassLoaderData* loader_data,
1235 TRAPS) {
1236
1237 assert(cp != NULL, "invariant");
1238 assert(buffer != NULL, "invariant");
1239 assert(coll != NULL, "invariant");
1240 assert(loader_data != NULL, "invariant");
1241
1242 // annotations := do(nann:u2) {annotation}
1243 int index = 2; // read nann
1244 if (index >= limit) return;
1245 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1246 enum { // initial annotation layout
1247 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1248 count_off = 2, // u2 such as 1 (one value)
1249 member_off = 4, // utf8 such as 'value'
1250 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1251 e_tag_val = 'e',
1252 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1253 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1254 e_size = 11, // end of 'e' annotation
1255 c_tag_val = 'c', // payload is type
1256 c_con_off = 7, // utf8 payload, such as 'I'
1257 c_size = 9, // end of 'c' annotation
1258 s_tag_val = 's', // payload is String
1259 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1260 s_size = 9,
1261 min_size = 6 // smallest possible size (zero members)
1262 };
1263 // Cannot add min_size to index in case of overflow MAX_INT
1264 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1265 int index0 = index;
1266 index = skip_annotation(buffer, limit, index);
1267 const u1* const abase = buffer + index0;
1268 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1269 const int count = Bytes::get_Java_u2((address)abase + count_off);
1270 const Symbol* const aname = check_symbol_at(cp, atype);
1271 if (aname == NULL) break; // invalid annotation name
1272 const Symbol* member = NULL;
1273 if (count >= 1) {
1274 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1275 member = check_symbol_at(cp, member_index);
1276 if (member == NULL) break; // invalid member name
1277 }
1278
1279 // Here is where parsing particular annotations will take place.
1280 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1281 if (AnnotationCollector::_unknown == id) continue;
1282 coll->set_annotation(id);
1283
1284 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1285 // @Contended can optionally specify the contention group.
1286 //
1287 // Contended group defines the equivalence class over the fields:
1288 // the fields within the same contended group are not treated distinct.
1289 // The only exception is default group, which does not incur the
1290 // equivalence. Naturally, contention group for classes is meaningless.
1291 //
1292 // While the contention group is specified as String, annotation
1293 // values are already interned, and we might as well use the constant
1294 // pool index as the group tag.
1295 //
1296 u2 group_index = 0; // default contended group
1297 if (count == 1
1298 && s_size == (index - index0) // match size
1299 && s_tag_val == *(abase + tag_off)
1300 && member == vmSymbols::value_name()) {
1301 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1302 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1303 group_index = 0; // default contended group
1304 }
1305 }
1306 coll->set_contended_group(group_index);
1307 }
1308 }
1309 }
1310
1311
1312 // Parse attributes for a field.
1313 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1314 u2 attributes_count,
1315 bool is_static, u2 signature_index,
1316 u2* const constantvalue_index_addr,
1317 bool* const is_synthetic_addr,
1318 u2* const generic_signature_index_addr,
1319 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1320 TRAPS) {
1321 assert(cfs != NULL, "invariant");
1322 assert(constantvalue_index_addr != NULL, "invariant");
1323 assert(is_synthetic_addr != NULL, "invariant");
1324 assert(generic_signature_index_addr != NULL, "invariant");
1325 assert(parsed_annotations != NULL, "invariant");
1326 assert(attributes_count > 0, "attributes_count should be greater than 0");
1327
1328 u2 constantvalue_index = 0;
1329 u2 generic_signature_index = 0;
1330 bool is_synthetic = false;
1331 const u1* runtime_visible_annotations = NULL;
1332 int runtime_visible_annotations_length = 0;
1333 const u1* runtime_invisible_annotations = NULL;
1334 int runtime_invisible_annotations_length = 0;
1335 const u1* runtime_visible_type_annotations = NULL;
1336 int runtime_visible_type_annotations_length = 0;
1337 const u1* runtime_invisible_type_annotations = NULL;
1338 int runtime_invisible_type_annotations_length = 0;
1339 bool runtime_invisible_annotations_exists = false;
1340 bool runtime_invisible_type_annotations_exists = false;
1341 const ConstantPool* const cp = _cp;
1342
1343 while (attributes_count--) {
1344 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1345 const u2 attribute_name_index = cfs->get_u2_fast();
1346 const u4 attribute_length = cfs->get_u4_fast();
1347 check_property(valid_symbol_at(attribute_name_index),
1348 "Invalid field attribute index %u in class file %s",
1349 attribute_name_index,
1350 CHECK);
1351
1352 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1353 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1354 // ignore if non-static
1355 if (constantvalue_index != 0) {
1356 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1357 }
1358 check_property(
1359 attribute_length == 2,
1360 "Invalid ConstantValue field attribute length %u in class file %s",
1361 attribute_length, CHECK);
1362
1363 constantvalue_index = cfs->get_u2(CHECK);
1364 if (_need_verify) {
1365 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1366 }
1367 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1368 if (attribute_length != 0) {
1369 classfile_parse_error(
1370 "Invalid Synthetic field attribute length %u in class file %s",
1371 attribute_length, CHECK);
1372 }
1373 is_synthetic = true;
1374 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1375 if (attribute_length != 0) {
1376 classfile_parse_error(
1377 "Invalid Deprecated field attribute length %u in class file %s",
1378 attribute_length, CHECK);
1379 }
1380 } else if (_major_version >= JAVA_1_5_VERSION) {
1381 if (attribute_name == vmSymbols::tag_signature()) {
1382 if (generic_signature_index != 0) {
1383 classfile_parse_error(
1384 "Multiple Signature attributes for field in class file %s", CHECK);
1385 }
1386 if (attribute_length != 2) {
1387 classfile_parse_error(
1388 "Wrong size %u for field's Signature attribute in class file %s",
1389 attribute_length, CHECK);
1390 }
1391 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1392 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1393 if (runtime_visible_annotations != NULL) {
1394 classfile_parse_error(
1395 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1396 }
1397 runtime_visible_annotations_length = attribute_length;
1398 runtime_visible_annotations = cfs->current();
1399 assert(runtime_visible_annotations != NULL, "null visible annotations");
1400 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1401 parse_annotations(cp,
1402 runtime_visible_annotations,
1403 runtime_visible_annotations_length,
1404 parsed_annotations,
1405 _loader_data,
1406 CHECK);
1407 cfs->skip_u1_fast(runtime_visible_annotations_length);
1408 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1409 if (runtime_invisible_annotations_exists) {
1410 classfile_parse_error(
1411 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1412 }
1413 runtime_invisible_annotations_exists = true;
1414 if (PreserveAllAnnotations) {
1415 runtime_invisible_annotations_length = attribute_length;
1416 runtime_invisible_annotations = cfs->current();
1417 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1418 }
1419 cfs->skip_u1(attribute_length, CHECK);
1420 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1421 if (runtime_visible_type_annotations != NULL) {
1422 classfile_parse_error(
1423 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1424 }
1425 runtime_visible_type_annotations_length = attribute_length;
1426 runtime_visible_type_annotations = cfs->current();
1427 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1428 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1429 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1430 if (runtime_invisible_type_annotations_exists) {
1431 classfile_parse_error(
1432 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1433 } else {
1434 runtime_invisible_type_annotations_exists = true;
1435 }
1436 if (PreserveAllAnnotations) {
1437 runtime_invisible_type_annotations_length = attribute_length;
1438 runtime_invisible_type_annotations = cfs->current();
1439 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1440 }
1441 cfs->skip_u1(attribute_length, CHECK);
1442 } else {
1443 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1444 }
1445 } else {
1446 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1447 }
1448 }
1449
1450 *constantvalue_index_addr = constantvalue_index;
1451 *is_synthetic_addr = is_synthetic;
1452 *generic_signature_index_addr = generic_signature_index;
1453 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1454 runtime_visible_annotations_length,
1455 runtime_invisible_annotations,
1456 runtime_invisible_annotations_length,
1457 CHECK);
1458 parsed_annotations->set_field_annotations(a);
1459 a = assemble_annotations(runtime_visible_type_annotations,
1460 runtime_visible_type_annotations_length,
1461 runtime_invisible_type_annotations,
1462 runtime_invisible_type_annotations_length,
1463 CHECK);
1464 parsed_annotations->set_field_type_annotations(a);
1465 return;
1466 }
1467
1468
1469 // Field allocation types. Used for computing field offsets.
1470
1471 enum FieldAllocationType {
1472 STATIC_OOP, // Oops
1473 STATIC_BYTE, // Boolean, Byte, char
1474 STATIC_SHORT, // shorts
1475 STATIC_WORD, // ints
1476 STATIC_DOUBLE, // aligned long or double
1477 STATIC_FLATTENABLE, // flattenable field
1478 NONSTATIC_OOP,
1479 NONSTATIC_BYTE,
1480 NONSTATIC_SHORT,
1481 NONSTATIC_WORD,
1482 NONSTATIC_DOUBLE,
1483 NONSTATIC_FLATTENABLE,
1484 MAX_FIELD_ALLOCATION_TYPE,
1485 BAD_ALLOCATION_TYPE = -1
1486 };
1487
1488 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1489 BAD_ALLOCATION_TYPE, // 0
1490 BAD_ALLOCATION_TYPE, // 1
1491 BAD_ALLOCATION_TYPE, // 2
1492 BAD_ALLOCATION_TYPE, // 3
1493 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1494 NONSTATIC_SHORT, // T_CHAR = 5,
1495 NONSTATIC_WORD, // T_FLOAT = 6,
1496 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1497 NONSTATIC_BYTE, // T_BYTE = 8,
1498 NONSTATIC_SHORT, // T_SHORT = 9,
1499 NONSTATIC_WORD, // T_INT = 10,
1500 NONSTATIC_DOUBLE, // T_LONG = 11,
1501 NONSTATIC_OOP, // T_OBJECT = 12,
1502 NONSTATIC_OOP, // T_ARRAY = 13,
1503 NONSTATIC_OOP, // T_VALUETYPE = 14,
1504 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1505 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1506 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1507 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1508 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1509 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20,
1510 BAD_ALLOCATION_TYPE, // 0
1511 BAD_ALLOCATION_TYPE, // 1
1512 BAD_ALLOCATION_TYPE, // 2
1513 BAD_ALLOCATION_TYPE, // 3
1514 STATIC_BYTE , // T_BOOLEAN = 4,
1515 STATIC_SHORT, // T_CHAR = 5,
1516 STATIC_WORD, // T_FLOAT = 6,
1517 STATIC_DOUBLE, // T_DOUBLE = 7,
1518 STATIC_BYTE, // T_BYTE = 8,
1519 STATIC_SHORT, // T_SHORT = 9,
1520 STATIC_WORD, // T_INT = 10,
1521 STATIC_DOUBLE, // T_LONG = 11,
1522 STATIC_OOP, // T_OBJECT = 12,
1523 STATIC_OOP, // T_ARRAY = 13,
1524 STATIC_OOP, // T_VALUETYPE = 14,
1525 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1526 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1527 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1528 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1529 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1530 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20
1531 };
1532
1533 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type, bool is_flattenable) {
1534 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1535 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1536 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1537 if (is_flattenable) {
1538 result = is_static ? STATIC_FLATTENABLE : NONSTATIC_FLATTENABLE;
1539 }
1540 return result;
1541 }
1542
1543 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1544 public:
1545 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1546
1547 FieldAllocationCount() {
1548 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1549 count[i] = 0;
1550 }
1551 }
1552
1553 FieldAllocationType update(bool is_static, BasicType type, bool is_flattenable) {
1554 FieldAllocationType atype = basic_type_to_atype(is_static, type, is_flattenable);
1555 if (atype != BAD_ALLOCATION_TYPE) {
1556 // Make sure there is no overflow with injected fields.
1557 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1558 count[atype]++;
1559 }
1560 return atype;
1561 }
1562 };
1563
1564 // Side-effects: populates the _fields, _fields_annotations,
1565 // _fields_type_annotations fields
1566 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1567 bool is_interface,
1568 bool is_value_type,
1569 FieldAllocationCount* const fac,
1570 ConstantPool* cp,
1571 const int cp_size,
1572 u2* const java_fields_count_ptr,
1573 TRAPS) {
1574
1575 assert(cfs != NULL, "invariant");
1576 assert(fac != NULL, "invariant");
1577 assert(cp != NULL, "invariant");
1578 assert(java_fields_count_ptr != NULL, "invariant");
1579
1580 assert(NULL == _fields, "invariant");
1581 assert(NULL == _fields_annotations, "invariant");
1582 assert(NULL == _fields_type_annotations, "invariant");
1583
1584 cfs->guarantee_more(2, CHECK); // length
1585 const u2 length = cfs->get_u2_fast();
1586 *java_fields_count_ptr = length;
1587
1588 int num_injected = 0;
1589 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1590 &num_injected);
1591
1592 const int total_fields = length + num_injected + (is_value_type ? 1 : 0);
1593
1594 // The field array starts with tuples of shorts
1595 // [access, name index, sig index, initial value index, byte offset].
1596 // A generic signature slot only exists for field with generic
1597 // signature attribute. And the access flag is set with
1598 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1599 // signature slots are at the end of the field array and after all
1600 // other fields data.
1601 //
1602 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1603 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1604 // ...
1605 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1606 // [generic signature index]
1607 // [generic signature index]
1608 // ...
1609 //
1610 // Allocate a temporary resource array for field data. For each field,
1611 // a slot is reserved in the temporary array for the generic signature
1612 // index. After parsing all fields, the data are copied to a permanent
1613 // array and any unused slots will be discarded.
1614 ResourceMark rm(THREAD);
1615 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1616 u2,
1617 total_fields * (FieldInfo::field_slots + 1));
1618
1619 // The generic signature slots start after all other fields' data.
1620 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1621 int num_generic_signature = 0;
1622 for (int n = 0; n < length; n++) {
1623 // access_flags, name_index, descriptor_index, attributes_count
1624 cfs->guarantee_more(8, CHECK);
1625
1626 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1627
1628 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1629 verify_legal_field_modifiers(flags, is_interface, is_value_type, CHECK);
1630 AccessFlags access_flags;
1631 access_flags.set_flags(flags);
1632
1633 const u2 name_index = cfs->get_u2_fast();
1634 check_property(valid_symbol_at(name_index),
1635 "Invalid constant pool index %u for field name in class file %s",
1636 name_index, CHECK);
1637 const Symbol* const name = cp->symbol_at(name_index);
1638 verify_legal_field_name(name, CHECK);
1639
1640 const u2 signature_index = cfs->get_u2_fast();
1641 check_property(valid_symbol_at(signature_index),
1642 "Invalid constant pool index %u for field signature in class file %s",
1643 signature_index, CHECK);
1644 const Symbol* const sig = cp->symbol_at(signature_index);
1645 verify_legal_field_signature(name, sig, CHECK);
1646 assert(!access_flags.is_flattenable(), "ACC_FLATTENABLE should have been filtered out");
1647 if (sig->is_Q_signature()) {
1648 // assert(_major_version >= CONSTANT_CLASS_DESCRIPTORS, "Q-descriptors are only supported in recent classfiles");
1649 access_flags.set_is_flattenable();
1650 }
1651 if (access_flags.is_flattenable()) {
1652 // Array flattenability cannot be specified. Arrays of value classes are
1653 // are always flattenable. Arrays of other classes are not flattenable.
1654 if (sig->utf8_length() > 1 && sig->char_at(0) == '[') {
1655 classfile_parse_error(
1656 "Field \"%s\" with signature \"%s\" in class file %s is invalid."
1657 " ACC_FLATTENABLE cannot be specified for an array",
1658 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1659 }
1660 _has_flattenable_fields = true;
1661 }
1662
1663 u2 constantvalue_index = 0;
1664 bool is_synthetic = false;
1665 u2 generic_signature_index = 0;
1666 const bool is_static = access_flags.is_static();
1667 FieldAnnotationCollector parsed_annotations(_loader_data);
1668
1669 const u2 attributes_count = cfs->get_u2_fast();
1670 if (attributes_count > 0) {
1671 parse_field_attributes(cfs,
1672 attributes_count,
1673 is_static,
1674 signature_index,
1675 &constantvalue_index,
1676 &is_synthetic,
1677 &generic_signature_index,
1678 &parsed_annotations,
1679 CHECK);
1680
1681 if (parsed_annotations.field_annotations() != NULL) {
1682 if (_fields_annotations == NULL) {
1683 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1684 _loader_data, length, NULL,
1685 CHECK);
1686 }
1687 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1688 parsed_annotations.set_field_annotations(NULL);
1689 }
1690 if (parsed_annotations.field_type_annotations() != NULL) {
1691 if (_fields_type_annotations == NULL) {
1692 _fields_type_annotations =
1693 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1694 length,
1695 NULL,
1696 CHECK);
1697 }
1698 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1699 parsed_annotations.set_field_type_annotations(NULL);
1700 }
1701
1702 if (is_synthetic) {
1703 access_flags.set_is_synthetic();
1704 }
1705 if (generic_signature_index != 0) {
1706 access_flags.set_field_has_generic_signature();
1707 fa[generic_signature_slot] = generic_signature_index;
1708 generic_signature_slot ++;
1709 num_generic_signature ++;
1710 }
1711 }
1712
1713 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1714 field->initialize(access_flags.as_short(),
1715 name_index,
1716 signature_index,
1717 constantvalue_index);
1718 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1719
1720 // Remember how many oops we encountered and compute allocation type
1721 const FieldAllocationType atype = fac->update(is_static, type, access_flags.is_flattenable());
1722 field->set_allocation_type(atype);
1723
1724 // After field is initialized with type, we can augment it with aux info
1725 if (parsed_annotations.has_any_annotations())
1726 parsed_annotations.apply_to(field);
1727 }
1728
1729 int index = length;
1730 if (num_injected != 0) {
1731 for (int n = 0; n < num_injected; n++) {
1732 // Check for duplicates
1733 if (injected[n].may_be_java) {
1734 const Symbol* const name = injected[n].name();
1735 const Symbol* const signature = injected[n].signature();
1736 bool duplicate = false;
1737 for (int i = 0; i < length; i++) {
1738 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1739 if (name == cp->symbol_at(f->name_index()) &&
1740 signature == cp->symbol_at(f->signature_index())) {
1741 // Symbol is desclared in Java so skip this one
1742 duplicate = true;
1743 break;
1744 }
1745 }
1746 if (duplicate) {
1747 // These will be removed from the field array at the end
1748 continue;
1749 }
1750 }
1751
1752 // Injected field
1753 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1754 field->initialize(JVM_ACC_FIELD_INTERNAL,
1755 injected[n].name_index,
1756 injected[n].signature_index,
1757 0);
1758
1759 const BasicType type = FieldType::basic_type(injected[n].signature());
1760
1761 // Remember how many oops we encountered and compute allocation type
1762 const FieldAllocationType atype = fac->update(false, type, false);
1763 field->set_allocation_type(atype);
1764 index++;
1765 }
1766 }
1767
1768 if (is_value_type) {
1769 index = length + num_injected;
1770 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1771 field->initialize(JVM_ACC_FIELD_INTERNAL | JVM_ACC_STATIC,
1772 vmSymbols::default_value_name_enum,
1773 vmSymbols::java_lang_Object_enum,
1774 0);
1775 const BasicType type = FieldType::basic_type(vmSymbols::object_signature());
1776 const FieldAllocationType atype = fac->update(true, type, false);
1777 field->set_allocation_type(atype);
1778 index++;
1779 }
1780
1781 assert(NULL == _fields, "invariant");
1782
1783 _fields =
1784 MetadataFactory::new_array<u2>(_loader_data,
1785 index * FieldInfo::field_slots + num_generic_signature,
1786 CHECK);
1787 // Sometimes injected fields already exist in the Java source so
1788 // the fields array could be too long. In that case the
1789 // fields array is trimed. Also unused slots that were reserved
1790 // for generic signature indexes are discarded.
1791 {
1792 int i = 0;
1793 for (; i < index * FieldInfo::field_slots; i++) {
1794 _fields->at_put(i, fa[i]);
1795 }
1796 for (int j = total_fields * FieldInfo::field_slots;
1797 j < generic_signature_slot; j++) {
1798 _fields->at_put(i++, fa[j]);
1799 }
1800 assert(_fields->length() == i, "");
1801 }
1802
1803 if (_need_verify && length > 1) {
1804 // Check duplicated fields
1805 ResourceMark rm(THREAD);
1806 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1807 THREAD, NameSigHash*, HASH_ROW_SIZE);
1808 initialize_hashtable(names_and_sigs);
1809 bool dup = false;
1810 const Symbol* name = NULL;
1811 const Symbol* sig = NULL;
1812 {
1813 debug_only(NoSafepointVerifier nsv;)
1814 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1815 name = fs.name();
1816 sig = fs.signature();
1817 // If no duplicates, add name/signature in hashtable names_and_sigs.
1818 if (!put_after_lookup(name, sig, names_and_sigs)) {
1819 dup = true;
1820 break;
1821 }
1822 }
1823 }
1824 if (dup) {
1825 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1826 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1827 }
1828 }
1829 }
1830
1831
1832 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1833 u4 code_length,
1834 u4 exception_table_length,
1835 TRAPS) {
1836 assert(cfs != NULL, "invariant");
1837
1838 const unsafe_u2* const exception_table_start = cfs->current();
1839 assert(exception_table_start != NULL, "null exception table");
1840
1841 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1842 // end_pc,
1843 // handler_pc,
1844 // catch_type_index
1845
1846 // Will check legal target after parsing code array in verifier.
1847 if (_need_verify) {
1848 for (unsigned int i = 0; i < exception_table_length; i++) {
1849 const u2 start_pc = cfs->get_u2_fast();
1850 const u2 end_pc = cfs->get_u2_fast();
1851 const u2 handler_pc = cfs->get_u2_fast();
1852 const u2 catch_type_index = cfs->get_u2_fast();
1853 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1854 "Illegal exception table range in class file %s",
1855 CHECK_NULL);
1856 guarantee_property(handler_pc < code_length,
1857 "Illegal exception table handler in class file %s",
1858 CHECK_NULL);
1859 if (catch_type_index != 0) {
1860 guarantee_property(valid_klass_reference_at(catch_type_index),
1861 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1862 }
1863 }
1864 } else {
1865 cfs->skip_u2_fast(exception_table_length * 4);
1866 }
1867 return exception_table_start;
1868 }
1869
1870 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1871 u4 code_length,
1872 CompressedLineNumberWriteStream**const write_stream,
1873 TRAPS) {
1874
1875 const ClassFileStream* const cfs = _stream;
1876 unsigned int num_entries = cfs->get_u2(CHECK);
1877
1878 // Each entry is a u2 start_pc, and a u2 line_number
1879 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1880
1881 // Verify line number attribute and table length
1882 check_property(
1883 code_attribute_length == sizeof(u2) + length_in_bytes,
1884 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1885
1886 cfs->guarantee_more(length_in_bytes, CHECK);
1887
1888 if ((*write_stream) == NULL) {
1889 if (length_in_bytes > fixed_buffer_size) {
1890 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1891 } else {
1892 (*write_stream) = new CompressedLineNumberWriteStream(
1893 _linenumbertable_buffer, fixed_buffer_size);
1894 }
1895 }
1896
1897 while (num_entries-- > 0) {
1898 const u2 bci = cfs->get_u2_fast(); // start_pc
1899 const u2 line = cfs->get_u2_fast(); // line_number
1900 guarantee_property(bci < code_length,
1901 "Invalid pc in LineNumberTable in class file %s", CHECK);
1902 (*write_stream)->write_pair(bci, line);
1903 }
1904 }
1905
1906
1907 class LVT_Hash : public AllStatic {
1908 public:
1909
1910 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1911 /*
1912 * 3-tuple start_bci/length/slot has to be unique key,
1913 * so the following comparison seems to be redundant:
1914 * && elem->name_cp_index == entry->_elem->name_cp_index
1915 */
1916 return (e0.start_bci == e1.start_bci &&
1917 e0.length == e1.length &&
1918 e0.name_cp_index == e1.name_cp_index &&
1919 e0.slot == e1.slot);
1920 }
1921
1922 static unsigned int hash(LocalVariableTableElement const& e0) {
1923 unsigned int raw_hash = e0.start_bci;
1924
1925 raw_hash = e0.length + raw_hash * 37;
1926 raw_hash = e0.name_cp_index + raw_hash * 37;
1927 raw_hash = e0.slot + raw_hash * 37;
1928
1929 return raw_hash;
1930 }
1931 };
1932
1933
1934 // Class file LocalVariableTable elements.
1935 class Classfile_LVT_Element {
1936 public:
1937 u2 start_bci;
1938 u2 length;
1939 u2 name_cp_index;
1940 u2 descriptor_cp_index;
1941 u2 slot;
1942 };
1943
1944 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1945 LocalVariableTableElement* const lvt) {
1946 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1947 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1948 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1949 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1950 lvt->signature_cp_index = 0;
1951 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1952 }
1953
1954 // Function is used to parse both attributes:
1955 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1956 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1957 u4 code_length,
1958 u2 max_locals,
1959 u4 code_attribute_length,
1960 u2* const localvariable_table_length,
1961 bool isLVTT,
1962 TRAPS) {
1963 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1964 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1965 const unsigned int size =
1966 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1967
1968 const ConstantPool* const cp = _cp;
1969
1970 // Verify local variable table attribute has right length
1971 if (_need_verify) {
1972 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1973 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1974 }
1975
1976 const unsafe_u2* const localvariable_table_start = cfs->current();
1977 assert(localvariable_table_start != NULL, "null local variable table");
1978 if (!_need_verify) {
1979 cfs->skip_u2_fast(size);
1980 } else {
1981 cfs->guarantee_more(size * 2, CHECK_NULL);
1982 for(int i = 0; i < (*localvariable_table_length); i++) {
1983 const u2 start_pc = cfs->get_u2_fast();
1984 const u2 length = cfs->get_u2_fast();
1985 const u2 name_index = cfs->get_u2_fast();
1986 const u2 descriptor_index = cfs->get_u2_fast();
1987 const u2 index = cfs->get_u2_fast();
1988 // Assign to a u4 to avoid overflow
1989 const u4 end_pc = (u4)start_pc + (u4)length;
1990
1991 if (start_pc >= code_length) {
1992 classfile_parse_error(
1993 "Invalid start_pc %u in %s in class file %s",
1994 start_pc, tbl_name, CHECK_NULL);
1995 }
1996 if (end_pc > code_length) {
1997 classfile_parse_error(
1998 "Invalid length %u in %s in class file %s",
1999 length, tbl_name, CHECK_NULL);
2000 }
2001 const int cp_size = cp->length();
2002 guarantee_property(valid_symbol_at(name_index),
2003 "Name index %u in %s has bad constant type in class file %s",
2004 name_index, tbl_name, CHECK_NULL);
2005 guarantee_property(valid_symbol_at(descriptor_index),
2006 "Signature index %u in %s has bad constant type in class file %s",
2007 descriptor_index, tbl_name, CHECK_NULL);
2008
2009 const Symbol* const name = cp->symbol_at(name_index);
2010 const Symbol* const sig = cp->symbol_at(descriptor_index);
2011 verify_legal_field_name(name, CHECK_NULL);
2012 u2 extra_slot = 0;
2013 if (!isLVTT) {
2014 verify_legal_field_signature(name, sig, CHECK_NULL);
2015
2016 // 4894874: check special cases for double and long local variables
2017 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
2018 sig == vmSymbols::type_signature(T_LONG)) {
2019 extra_slot = 1;
2020 }
2021 }
2022 guarantee_property((index + extra_slot) < max_locals,
2023 "Invalid index %u in %s in class file %s",
2024 index, tbl_name, CHECK_NULL);
2025 }
2026 }
2027 return localvariable_table_start;
2028 }
2029
2030 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
2031 u4 code_attribute_length,
2032 bool need_verify,
2033 TRAPS) {
2034 assert(cfs != NULL, "invariant");
2035
2036 if (0 == code_attribute_length) {
2037 return NULL;
2038 }
2039
2040 const u1* const stackmap_table_start = cfs->current();
2041 assert(stackmap_table_start != NULL, "null stackmap table");
2042
2043 // check code_attribute_length first
2044 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2045
2046 if (!need_verify && !DumpSharedSpaces) {
2047 return NULL;
2048 }
2049 return stackmap_table_start;
2050 }
2051
2052 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2053 u2* const checked_exceptions_length,
2054 u4 method_attribute_length,
2055 TRAPS) {
2056 assert(cfs != NULL, "invariant");
2057 assert(checked_exceptions_length != NULL, "invariant");
2058
2059 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2060 *checked_exceptions_length = cfs->get_u2_fast();
2061 const unsigned int size =
2062 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2063 const unsafe_u2* const checked_exceptions_start = cfs->current();
2064 assert(checked_exceptions_start != NULL, "null checked exceptions");
2065 if (!_need_verify) {
2066 cfs->skip_u2_fast(size);
2067 } else {
2068 // Verify each value in the checked exception table
2069 u2 checked_exception;
2070 const u2 len = *checked_exceptions_length;
2071 cfs->guarantee_more(2 * len, CHECK_NULL);
2072 for (int i = 0; i < len; i++) {
2073 checked_exception = cfs->get_u2_fast();
2074 check_property(
2075 valid_klass_reference_at(checked_exception),
2076 "Exception name has bad type at constant pool %u in class file %s",
2077 checked_exception, CHECK_NULL);
2078 }
2079 }
2080 // check exceptions attribute length
2081 if (_need_verify) {
2082 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2083 sizeof(u2) * size),
2084 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2085 }
2086 return checked_exceptions_start;
2087 }
2088
2089 void ClassFileParser::throwIllegalSignature(const char* type,
2090 const Symbol* name,
2091 const Symbol* sig,
2092 TRAPS) const {
2093 assert(name != NULL, "invariant");
2094 assert(sig != NULL, "invariant");
2095
2096 ResourceMark rm(THREAD);
2097 Exceptions::fthrow(THREAD_AND_LOCATION,
2098 vmSymbols::java_lang_ClassFormatError(),
2099 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2100 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2101 }
2102
2103 AnnotationCollector::ID
2104 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2105 const Symbol* name) {
2106 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2107 // Privileged code can use all annotations. Other code silently drops some.
2108 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2109 loader_data->is_platform_class_loader_data() ||
2110 loader_data->is_unsafe_anonymous();
2111 switch (sid) {
2112 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2113 if (_location != _in_method) break; // only allow for methods
2114 if (!privileged) break; // only allow in privileged code
2115 return _method_CallerSensitive;
2116 }
2117 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2118 if (_location != _in_method) break; // only allow for methods
2119 if (!privileged) break; // only allow in privileged code
2120 return _method_ForceInline;
2121 }
2122 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2123 if (_location != _in_method) break; // only allow for methods
2124 if (!privileged) break; // only allow in privileged code
2125 return _method_DontInline;
2126 }
2127 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2128 if (_location != _in_method) break; // only allow for methods
2129 if (!privileged) break; // only allow in privileged code
2130 return _method_InjectedProfile;
2131 }
2132 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2133 if (_location != _in_method) break; // only allow for methods
2134 if (!privileged) break; // only allow in privileged code
2135 return _method_LambdaForm_Compiled;
2136 }
2137 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
2138 if (_location != _in_method) break; // only allow for methods
2139 if (!privileged) break; // only allow in privileged code
2140 return _method_Hidden;
2141 }
2142 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2143 if (_location != _in_method) break; // only allow for methods
2144 if (!privileged) break; // only allow in privileged code
2145 return _method_HotSpotIntrinsicCandidate;
2146 }
2147 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2148 if (_location != _in_field) break; // only allow for fields
2149 if (!privileged) break; // only allow in privileged code
2150 return _field_Stable;
2151 }
2152 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2153 if (_location != _in_field && _location != _in_class) {
2154 break; // only allow for fields and classes
2155 }
2156 if (!EnableContended || (RestrictContended && !privileged)) {
2157 break; // honor privileges
2158 }
2159 return _jdk_internal_vm_annotation_Contended;
2160 }
2161 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2162 if (_location != _in_method) break; // only allow for methods
2163 if (RestrictReservedStack && !privileged) break; // honor privileges
2164 return _jdk_internal_vm_annotation_ReservedStackAccess;
2165 }
2166 default: {
2167 break;
2168 }
2169 }
2170 return AnnotationCollector::_unknown;
2171 }
2172
2173 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2174 if (is_contended())
2175 f->set_contended_group(contended_group());
2176 if (is_stable())
2177 f->set_stable(true);
2178 }
2179
2180 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2181 // If there's an error deallocate metadata for field annotations
2182 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2183 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2184 }
2185
2186 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2187 if (has_annotation(_method_CallerSensitive))
2188 m->set_caller_sensitive(true);
2189 if (has_annotation(_method_ForceInline))
2190 m->set_force_inline(true);
2191 if (has_annotation(_method_DontInline))
2192 m->set_dont_inline(true);
2193 if (has_annotation(_method_InjectedProfile))
2194 m->set_has_injected_profile(true);
2195 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2196 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2197 if (has_annotation(_method_Hidden))
2198 m->set_hidden(true);
2199 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2200 m->set_intrinsic_candidate(true);
2201 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2202 m->set_has_reserved_stack_access(true);
2203 }
2204
2205 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2206 assert(ik != NULL, "invariant");
2207 ik->set_is_contended(is_contended());
2208 }
2209
2210 #define MAX_ARGS_SIZE 255
2211 #define MAX_CODE_SIZE 65535
2212 #define INITIAL_MAX_LVT_NUMBER 256
2213
2214 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2215 *
2216 * Rules for LVT's and LVTT's are:
2217 * - There can be any number of LVT's and LVTT's.
2218 * - If there are n LVT's, it is the same as if there was just
2219 * one LVT containing all the entries from the n LVT's.
2220 * - There may be no more than one LVT entry per local variable.
2221 * Two LVT entries are 'equal' if these fields are the same:
2222 * start_pc, length, name, slot
2223 * - There may be no more than one LVTT entry per each LVT entry.
2224 * Each LVTT entry has to match some LVT entry.
2225 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2226 */
2227 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2228 int lvt_cnt,
2229 u2* const localvariable_table_length,
2230 const unsafe_u2** const localvariable_table_start,
2231 int lvtt_cnt,
2232 u2* const localvariable_type_table_length,
2233 const unsafe_u2** const localvariable_type_table_start,
2234 TRAPS) {
2235
2236 ResourceMark rm(THREAD);
2237
2238 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2239 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2240
2241 LVT_HashTable* const table = new LVT_HashTable();
2242
2243 // To fill LocalVariableTable in
2244 const Classfile_LVT_Element* cf_lvt;
2245 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2246
2247 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2248 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2249 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2250 copy_lvt_element(&cf_lvt[idx], lvt);
2251 // If no duplicates, add LVT elem in hashtable.
2252 if (table->put(*lvt, lvt) == false
2253 && _need_verify
2254 && _major_version >= JAVA_1_5_VERSION) {
2255 classfile_parse_error("Duplicated LocalVariableTable attribute "
2256 "entry for '%s' in class file %s",
2257 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2258 CHECK);
2259 }
2260 }
2261 }
2262
2263 // To merge LocalVariableTable and LocalVariableTypeTable
2264 const Classfile_LVT_Element* cf_lvtt;
2265 LocalVariableTableElement lvtt_elem;
2266
2267 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2268 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2269 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2270 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2271 LocalVariableTableElement** entry = table->get(lvtt_elem);
2272 if (entry == NULL) {
2273 if (_need_verify) {
2274 classfile_parse_error("LVTT entry for '%s' in class file %s "
2275 "does not match any LVT entry",
2276 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2277 CHECK);
2278 }
2279 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2280 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2281 "entry for '%s' in class file %s",
2282 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2283 CHECK);
2284 } else {
2285 // to add generic signatures into LocalVariableTable
2286 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2287 }
2288 }
2289 }
2290 }
2291
2292
2293 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2294 const u1* runtime_visible_annotations,
2295 int runtime_visible_annotations_length,
2296 const u1* runtime_invisible_annotations,
2297 int runtime_invisible_annotations_length,
2298 const u1* runtime_visible_parameter_annotations,
2299 int runtime_visible_parameter_annotations_length,
2300 const u1* runtime_invisible_parameter_annotations,
2301 int runtime_invisible_parameter_annotations_length,
2302 const u1* runtime_visible_type_annotations,
2303 int runtime_visible_type_annotations_length,
2304 const u1* runtime_invisible_type_annotations,
2305 int runtime_invisible_type_annotations_length,
2306 const u1* annotation_default,
2307 int annotation_default_length,
2308 TRAPS) {
2309
2310 AnnotationArray* a;
2311
2312 if (runtime_visible_annotations_length +
2313 runtime_invisible_annotations_length > 0) {
2314 a = assemble_annotations(runtime_visible_annotations,
2315 runtime_visible_annotations_length,
2316 runtime_invisible_annotations,
2317 runtime_invisible_annotations_length,
2318 CHECK);
2319 cm->set_method_annotations(a);
2320 }
2321
2322 if (runtime_visible_parameter_annotations_length +
2323 runtime_invisible_parameter_annotations_length > 0) {
2324 a = assemble_annotations(runtime_visible_parameter_annotations,
2325 runtime_visible_parameter_annotations_length,
2326 runtime_invisible_parameter_annotations,
2327 runtime_invisible_parameter_annotations_length,
2328 CHECK);
2329 cm->set_parameter_annotations(a);
2330 }
2331
2332 if (annotation_default_length > 0) {
2333 a = assemble_annotations(annotation_default,
2334 annotation_default_length,
2335 NULL,
2336 0,
2337 CHECK);
2338 cm->set_default_annotations(a);
2339 }
2340
2341 if (runtime_visible_type_annotations_length +
2342 runtime_invisible_type_annotations_length > 0) {
2343 a = assemble_annotations(runtime_visible_type_annotations,
2344 runtime_visible_type_annotations_length,
2345 runtime_invisible_type_annotations,
2346 runtime_invisible_type_annotations_length,
2347 CHECK);
2348 cm->set_type_annotations(a);
2349 }
2350 }
2351
2352
2353 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2354 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2355 // Method* to save footprint, so we only know the size of the resulting Method* when the
2356 // entire method attribute is parsed.
2357 //
2358 // The promoted_flags parameter is used to pass relevant access_flags
2359 // from the method back up to the containing klass. These flag values
2360 // are added to klass's access_flags.
2361
2362 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2363 bool is_interface,
2364 bool is_value_type,
2365 const ConstantPool* cp,
2366 AccessFlags* const promoted_flags,
2367 TRAPS) {
2368 assert(cfs != NULL, "invariant");
2369 assert(cp != NULL, "invariant");
2370 assert(promoted_flags != NULL, "invariant");
2371
2372 ResourceMark rm(THREAD);
2373 // Parse fixed parts:
2374 // access_flags, name_index, descriptor_index, attributes_count
2375 cfs->guarantee_more(8, CHECK_NULL);
2376
2377 int flags = cfs->get_u2_fast();
2378 const u2 name_index = cfs->get_u2_fast();
2379 const int cp_size = cp->length();
2380 check_property(
2381 valid_symbol_at(name_index),
2382 "Illegal constant pool index %u for method name in class file %s",
2383 name_index, CHECK_NULL);
2384 const Symbol* const name = cp->symbol_at(name_index);
2385 verify_legal_method_name(name, CHECK_NULL);
2386
2387 const u2 signature_index = cfs->get_u2_fast();
2388 guarantee_property(
2389 valid_symbol_at(signature_index),
2390 "Illegal constant pool index %u for method signature in class file %s",
2391 signature_index, CHECK_NULL);
2392 const Symbol* const signature = cp->symbol_at(signature_index);
2393
2394 if (name == vmSymbols::class_initializer_name()) {
2395 // We ignore the other access flags for a valid class initializer.
2396 // (JVM Spec 2nd ed., chapter 4.6)
2397 if (_major_version < 51) { // backward compatibility
2398 flags = JVM_ACC_STATIC;
2399 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2400 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2401 } else {
2402 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2403 }
2404 } else {
2405 verify_legal_method_modifiers(flags, is_interface, is_value_type, name, CHECK_NULL);
2406 }
2407
2408 if (name == vmSymbols::object_initializer_name()) {
2409 if (is_interface) {
2410 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2411 /* TBD: uncomment when javac stops generating <init>() for value types.
2412 } else if (is_value_type) {
2413 classfile_parse_error("Value Type cannot have a method named <init>, class file %s", CHECK_NULL);
2414 */
2415 }
2416 }
2417
2418 int args_size = -1; // only used when _need_verify is true
2419 if (_need_verify) {
2420 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2421 verify_legal_method_signature(name, signature, CHECK_NULL);
2422 if (args_size > MAX_ARGS_SIZE) {
2423 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2424 }
2425 }
2426
2427 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2428
2429 // Default values for code and exceptions attribute elements
2430 u2 max_stack = 0;
2431 u2 max_locals = 0;
2432 u4 code_length = 0;
2433 const u1* code_start = 0;
2434 u2 exception_table_length = 0;
2435 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2436 Array<int>* exception_handlers = Universe::the_empty_int_array();
2437 u2 checked_exceptions_length = 0;
2438 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2439 CompressedLineNumberWriteStream* linenumber_table = NULL;
2440 int linenumber_table_length = 0;
2441 int total_lvt_length = 0;
2442 u2 lvt_cnt = 0;
2443 u2 lvtt_cnt = 0;
2444 bool lvt_allocated = false;
2445 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2446 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2447 u2* localvariable_table_length = NULL;
2448 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2449 u2* localvariable_type_table_length = NULL;
2450 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2451 int method_parameters_length = -1;
2452 const u1* method_parameters_data = NULL;
2453 bool method_parameters_seen = false;
2454 bool parsed_code_attribute = false;
2455 bool parsed_checked_exceptions_attribute = false;
2456 bool parsed_stackmap_attribute = false;
2457 // stackmap attribute - JDK1.5
2458 const u1* stackmap_data = NULL;
2459 int stackmap_data_length = 0;
2460 u2 generic_signature_index = 0;
2461 MethodAnnotationCollector parsed_annotations;
2462 const u1* runtime_visible_annotations = NULL;
2463 int runtime_visible_annotations_length = 0;
2464 const u1* runtime_invisible_annotations = NULL;
2465 int runtime_invisible_annotations_length = 0;
2466 const u1* runtime_visible_parameter_annotations = NULL;
2467 int runtime_visible_parameter_annotations_length = 0;
2468 const u1* runtime_invisible_parameter_annotations = NULL;
2469 int runtime_invisible_parameter_annotations_length = 0;
2470 const u1* runtime_visible_type_annotations = NULL;
2471 int runtime_visible_type_annotations_length = 0;
2472 const u1* runtime_invisible_type_annotations = NULL;
2473 int runtime_invisible_type_annotations_length = 0;
2474 bool runtime_invisible_annotations_exists = false;
2475 bool runtime_invisible_type_annotations_exists = false;
2476 bool runtime_invisible_parameter_annotations_exists = false;
2477 const u1* annotation_default = NULL;
2478 int annotation_default_length = 0;
2479
2480 // Parse code and exceptions attribute
2481 u2 method_attributes_count = cfs->get_u2_fast();
2482 while (method_attributes_count--) {
2483 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2484 const u2 method_attribute_name_index = cfs->get_u2_fast();
2485 const u4 method_attribute_length = cfs->get_u4_fast();
2486 check_property(
2487 valid_symbol_at(method_attribute_name_index),
2488 "Invalid method attribute name index %u in class file %s",
2489 method_attribute_name_index, CHECK_NULL);
2490
2491 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2492 if (method_attribute_name == vmSymbols::tag_code()) {
2493 // Parse Code attribute
2494 if (_need_verify) {
2495 guarantee_property(
2496 !access_flags.is_native() && !access_flags.is_abstract(),
2497 "Code attribute in native or abstract methods in class file %s",
2498 CHECK_NULL);
2499 }
2500 if (parsed_code_attribute) {
2501 classfile_parse_error("Multiple Code attributes in class file %s",
2502 CHECK_NULL);
2503 }
2504 parsed_code_attribute = true;
2505
2506 // Stack size, locals size, and code size
2507 if (_major_version == 45 && _minor_version <= 2) {
2508 cfs->guarantee_more(4, CHECK_NULL);
2509 max_stack = cfs->get_u1_fast();
2510 max_locals = cfs->get_u1_fast();
2511 code_length = cfs->get_u2_fast();
2512 } else {
2513 cfs->guarantee_more(8, CHECK_NULL);
2514 max_stack = cfs->get_u2_fast();
2515 max_locals = cfs->get_u2_fast();
2516 code_length = cfs->get_u4_fast();
2517 }
2518 if (_need_verify) {
2519 guarantee_property(args_size <= max_locals,
2520 "Arguments can't fit into locals in class file %s",
2521 CHECK_NULL);
2522 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2523 "Invalid method Code length %u in class file %s",
2524 code_length, CHECK_NULL);
2525 }
2526 // Code pointer
2527 code_start = cfs->current();
2528 assert(code_start != NULL, "null code start");
2529 cfs->guarantee_more(code_length, CHECK_NULL);
2530 cfs->skip_u1_fast(code_length);
2531
2532 // Exception handler table
2533 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2534 exception_table_length = cfs->get_u2_fast();
2535 if (exception_table_length > 0) {
2536 exception_table_start = parse_exception_table(cfs,
2537 code_length,
2538 exception_table_length,
2539 CHECK_NULL);
2540 }
2541
2542 // Parse additional attributes in code attribute
2543 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2544 u2 code_attributes_count = cfs->get_u2_fast();
2545
2546 unsigned int calculated_attribute_length = 0;
2547
2548 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2549 calculated_attribute_length =
2550 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2551 } else {
2552 // max_stack, locals and length are smaller in pre-version 45.2 classes
2553 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2554 }
2555 calculated_attribute_length +=
2556 code_length +
2557 sizeof(exception_table_length) +
2558 sizeof(code_attributes_count) +
2559 exception_table_length *
2560 ( sizeof(u2) + // start_pc
2561 sizeof(u2) + // end_pc
2562 sizeof(u2) + // handler_pc
2563 sizeof(u2) ); // catch_type_index
2564
2565 while (code_attributes_count--) {
2566 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2567 const u2 code_attribute_name_index = cfs->get_u2_fast();
2568 const u4 code_attribute_length = cfs->get_u4_fast();
2569 calculated_attribute_length += code_attribute_length +
2570 sizeof(code_attribute_name_index) +
2571 sizeof(code_attribute_length);
2572 check_property(valid_symbol_at(code_attribute_name_index),
2573 "Invalid code attribute name index %u in class file %s",
2574 code_attribute_name_index,
2575 CHECK_NULL);
2576 if (LoadLineNumberTables &&
2577 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2578 // Parse and compress line number table
2579 parse_linenumber_table(code_attribute_length,
2580 code_length,
2581 &linenumber_table,
2582 CHECK_NULL);
2583
2584 } else if (LoadLocalVariableTables &&
2585 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2586 // Parse local variable table
2587 if (!lvt_allocated) {
2588 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2589 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2590 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2591 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2592 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2593 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2594 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2595 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2596 lvt_allocated = true;
2597 }
2598 if (lvt_cnt == max_lvt_cnt) {
2599 max_lvt_cnt <<= 1;
2600 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2601 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2602 }
2603 localvariable_table_start[lvt_cnt] =
2604 parse_localvariable_table(cfs,
2605 code_length,
2606 max_locals,
2607 code_attribute_length,
2608 &localvariable_table_length[lvt_cnt],
2609 false, // is not LVTT
2610 CHECK_NULL);
2611 total_lvt_length += localvariable_table_length[lvt_cnt];
2612 lvt_cnt++;
2613 } else if (LoadLocalVariableTypeTables &&
2614 _major_version >= JAVA_1_5_VERSION &&
2615 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2616 if (!lvt_allocated) {
2617 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2618 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2619 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2620 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2621 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2622 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2623 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2624 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2625 lvt_allocated = true;
2626 }
2627 // Parse local variable type table
2628 if (lvtt_cnt == max_lvtt_cnt) {
2629 max_lvtt_cnt <<= 1;
2630 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2631 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2632 }
2633 localvariable_type_table_start[lvtt_cnt] =
2634 parse_localvariable_table(cfs,
2635 code_length,
2636 max_locals,
2637 code_attribute_length,
2638 &localvariable_type_table_length[lvtt_cnt],
2639 true, // is LVTT
2640 CHECK_NULL);
2641 lvtt_cnt++;
2642 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2643 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2644 // Stack map is only needed by the new verifier in JDK1.5.
2645 if (parsed_stackmap_attribute) {
2646 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2647 }
2648 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2649 stackmap_data_length = code_attribute_length;
2650 parsed_stackmap_attribute = true;
2651 } else {
2652 // Skip unknown attributes
2653 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2654 }
2655 }
2656 // check method attribute length
2657 if (_need_verify) {
2658 guarantee_property(method_attribute_length == calculated_attribute_length,
2659 "Code segment has wrong length in class file %s",
2660 CHECK_NULL);
2661 }
2662 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2663 // Parse Exceptions attribute
2664 if (parsed_checked_exceptions_attribute) {
2665 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2666 CHECK_NULL);
2667 }
2668 parsed_checked_exceptions_attribute = true;
2669 checked_exceptions_start =
2670 parse_checked_exceptions(cfs,
2671 &checked_exceptions_length,
2672 method_attribute_length,
2673 CHECK_NULL);
2674 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2675 // reject multiple method parameters
2676 if (method_parameters_seen) {
2677 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2678 CHECK_NULL);
2679 }
2680 method_parameters_seen = true;
2681 method_parameters_length = cfs->get_u1_fast();
2682 const u2 real_length = (method_parameters_length * 4u) + 1u;
2683 if (method_attribute_length != real_length) {
2684 classfile_parse_error(
2685 "Invalid MethodParameters method attribute length %u in class file",
2686 method_attribute_length, CHECK_NULL);
2687 }
2688 method_parameters_data = cfs->current();
2689 cfs->skip_u2_fast(method_parameters_length);
2690 cfs->skip_u2_fast(method_parameters_length);
2691 // ignore this attribute if it cannot be reflected
2692 if (!SystemDictionary::Parameter_klass_loaded())
2693 method_parameters_length = -1;
2694 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2695 if (method_attribute_length != 0) {
2696 classfile_parse_error(
2697 "Invalid Synthetic method attribute length %u in class file %s",
2698 method_attribute_length, CHECK_NULL);
2699 }
2700 // Should we check that there hasn't already been a synthetic attribute?
2701 access_flags.set_is_synthetic();
2702 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2703 if (method_attribute_length != 0) {
2704 classfile_parse_error(
2705 "Invalid Deprecated method attribute length %u in class file %s",
2706 method_attribute_length, CHECK_NULL);
2707 }
2708 } else if (_major_version >= JAVA_1_5_VERSION) {
2709 if (method_attribute_name == vmSymbols::tag_signature()) {
2710 if (generic_signature_index != 0) {
2711 classfile_parse_error(
2712 "Multiple Signature attributes for method in class file %s",
2713 CHECK_NULL);
2714 }
2715 if (method_attribute_length != 2) {
2716 classfile_parse_error(
2717 "Invalid Signature attribute length %u in class file %s",
2718 method_attribute_length, CHECK_NULL);
2719 }
2720 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2721 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2722 if (runtime_visible_annotations != NULL) {
2723 classfile_parse_error(
2724 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2725 CHECK_NULL);
2726 }
2727 runtime_visible_annotations_length = method_attribute_length;
2728 runtime_visible_annotations = cfs->current();
2729 assert(runtime_visible_annotations != NULL, "null visible annotations");
2730 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2731 parse_annotations(cp,
2732 runtime_visible_annotations,
2733 runtime_visible_annotations_length,
2734 &parsed_annotations,
2735 _loader_data,
2736 CHECK_NULL);
2737 cfs->skip_u1_fast(runtime_visible_annotations_length);
2738 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2739 if (runtime_invisible_annotations_exists) {
2740 classfile_parse_error(
2741 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2742 CHECK_NULL);
2743 }
2744 runtime_invisible_annotations_exists = true;
2745 if (PreserveAllAnnotations) {
2746 runtime_invisible_annotations_length = method_attribute_length;
2747 runtime_invisible_annotations = cfs->current();
2748 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2749 }
2750 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2751 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2752 if (runtime_visible_parameter_annotations != NULL) {
2753 classfile_parse_error(
2754 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2755 CHECK_NULL);
2756 }
2757 runtime_visible_parameter_annotations_length = method_attribute_length;
2758 runtime_visible_parameter_annotations = cfs->current();
2759 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2760 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2761 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2762 if (runtime_invisible_parameter_annotations_exists) {
2763 classfile_parse_error(
2764 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2765 CHECK_NULL);
2766 }
2767 runtime_invisible_parameter_annotations_exists = true;
2768 if (PreserveAllAnnotations) {
2769 runtime_invisible_parameter_annotations_length = method_attribute_length;
2770 runtime_invisible_parameter_annotations = cfs->current();
2771 assert(runtime_invisible_parameter_annotations != NULL,
2772 "null invisible parameter annotations");
2773 }
2774 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2775 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2776 if (annotation_default != NULL) {
2777 classfile_parse_error(
2778 "Multiple AnnotationDefault attributes for method in class file %s",
2779 CHECK_NULL);
2780 }
2781 annotation_default_length = method_attribute_length;
2782 annotation_default = cfs->current();
2783 assert(annotation_default != NULL, "null annotation default");
2784 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2785 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2786 if (runtime_visible_type_annotations != NULL) {
2787 classfile_parse_error(
2788 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2789 CHECK_NULL);
2790 }
2791 runtime_visible_type_annotations_length = method_attribute_length;
2792 runtime_visible_type_annotations = cfs->current();
2793 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2794 // No need for the VM to parse Type annotations
2795 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2796 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2797 if (runtime_invisible_type_annotations_exists) {
2798 classfile_parse_error(
2799 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2800 CHECK_NULL);
2801 } else {
2802 runtime_invisible_type_annotations_exists = true;
2803 }
2804 if (PreserveAllAnnotations) {
2805 runtime_invisible_type_annotations_length = method_attribute_length;
2806 runtime_invisible_type_annotations = cfs->current();
2807 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2808 }
2809 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2810 } else {
2811 // Skip unknown attributes
2812 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2813 }
2814 } else {
2815 // Skip unknown attributes
2816 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2817 }
2818 }
2819
2820 if (linenumber_table != NULL) {
2821 linenumber_table->write_terminator();
2822 linenumber_table_length = linenumber_table->position();
2823 }
2824
2825 // Make sure there's at least one Code attribute in non-native/non-abstract method
2826 if (_need_verify) {
2827 guarantee_property(access_flags.is_native() ||
2828 access_flags.is_abstract() ||
2829 parsed_code_attribute,
2830 "Absent Code attribute in method that is not native or abstract in class file %s",
2831 CHECK_NULL);
2832 }
2833
2834 // All sizing information for a Method* is finally available, now create it
2835 InlineTableSizes sizes(
2836 total_lvt_length,
2837 linenumber_table_length,
2838 exception_table_length,
2839 checked_exceptions_length,
2840 method_parameters_length,
2841 generic_signature_index,
2842 runtime_visible_annotations_length +
2843 runtime_invisible_annotations_length,
2844 runtime_visible_parameter_annotations_length +
2845 runtime_invisible_parameter_annotations_length,
2846 runtime_visible_type_annotations_length +
2847 runtime_invisible_type_annotations_length,
2848 annotation_default_length,
2849 0);
2850
2851 Method* const m = Method::allocate(_loader_data,
2852 code_length,
2853 access_flags,
2854 &sizes,
2855 ConstMethod::NORMAL,
2856 CHECK_NULL);
2857
2858 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2859
2860 // Fill in information from fixed part (access_flags already set)
2861 m->set_constants(_cp);
2862 m->set_name_index(name_index);
2863 m->set_signature_index(signature_index);
2864
2865 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2866 m->constMethod()->set_result_type(rtf.type());
2867
2868 if (args_size >= 0) {
2869 m->set_size_of_parameters(args_size);
2870 } else {
2871 m->compute_size_of_parameters(THREAD);
2872 }
2873 #ifdef ASSERT
2874 if (args_size >= 0) {
2875 m->compute_size_of_parameters(THREAD);
2876 assert(args_size == m->size_of_parameters(), "");
2877 }
2878 #endif
2879
2880 // Fill in code attribute information
2881 m->set_max_stack(max_stack);
2882 m->set_max_locals(max_locals);
2883 if (stackmap_data != NULL) {
2884 m->constMethod()->copy_stackmap_data(_loader_data,
2885 (u1*)stackmap_data,
2886 stackmap_data_length,
2887 CHECK_NULL);
2888 }
2889
2890 // Copy byte codes
2891 m->set_code((u1*)code_start);
2892
2893 // Copy line number table
2894 if (linenumber_table != NULL) {
2895 memcpy(m->compressed_linenumber_table(),
2896 linenumber_table->buffer(),
2897 linenumber_table_length);
2898 }
2899
2900 // Copy exception table
2901 if (exception_table_length > 0) {
2902 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2903 m->exception_table_start(),
2904 exception_table_length * sizeof(ExceptionTableElement),
2905 sizeof(u2));
2906 }
2907
2908 // Copy method parameters
2909 if (method_parameters_length > 0) {
2910 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2911 for (int i = 0; i < method_parameters_length; i++) {
2912 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2913 method_parameters_data += 2;
2914 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2915 method_parameters_data += 2;
2916 }
2917 }
2918
2919 // Copy checked exceptions
2920 if (checked_exceptions_length > 0) {
2921 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2922 m->checked_exceptions_start(),
2923 checked_exceptions_length * sizeof(CheckedExceptionElement),
2924 sizeof(u2));
2925 }
2926
2927 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2928 if (total_lvt_length > 0) {
2929 promoted_flags->set_has_localvariable_table();
2930 copy_localvariable_table(m->constMethod(),
2931 lvt_cnt,
2932 localvariable_table_length,
2933 localvariable_table_start,
2934 lvtt_cnt,
2935 localvariable_type_table_length,
2936 localvariable_type_table_start,
2937 CHECK_NULL);
2938 }
2939
2940 if (parsed_annotations.has_any_annotations())
2941 parsed_annotations.apply_to(m);
2942
2943 // Copy annotations
2944 copy_method_annotations(m->constMethod(),
2945 runtime_visible_annotations,
2946 runtime_visible_annotations_length,
2947 runtime_invisible_annotations,
2948 runtime_invisible_annotations_length,
2949 runtime_visible_parameter_annotations,
2950 runtime_visible_parameter_annotations_length,
2951 runtime_invisible_parameter_annotations,
2952 runtime_invisible_parameter_annotations_length,
2953 runtime_visible_type_annotations,
2954 runtime_visible_type_annotations_length,
2955 runtime_invisible_type_annotations,
2956 runtime_invisible_type_annotations_length,
2957 annotation_default,
2958 annotation_default_length,
2959 CHECK_NULL);
2960
2961 if (name == vmSymbols::finalize_method_name() &&
2962 signature == vmSymbols::void_method_signature()) {
2963 if (m->is_empty_method()) {
2964 _has_empty_finalizer = true;
2965 } else {
2966 _has_finalizer = true;
2967 }
2968 }
2969 if (name == vmSymbols::object_initializer_name() &&
2970 signature == vmSymbols::void_method_signature() &&
2971 m->is_vanilla_constructor()) {
2972 _has_vanilla_constructor = true;
2973 }
2974
2975 NOT_PRODUCT(m->verify());
2976 return m;
2977 }
2978
2979
2980 // The promoted_flags parameter is used to pass relevant access_flags
2981 // from the methods back up to the containing klass. These flag values
2982 // are added to klass's access_flags.
2983 // Side-effects: populates the _methods field in the parser
2984 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2985 bool is_interface,
2986 bool is_value_type,
2987 AccessFlags* promoted_flags,
2988 bool* has_final_method,
2989 bool* declares_nonstatic_concrete_methods,
2990 TRAPS) {
2991 assert(cfs != NULL, "invariant");
2992 assert(promoted_flags != NULL, "invariant");
2993 assert(has_final_method != NULL, "invariant");
2994 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2995
2996 assert(NULL == _methods, "invariant");
2997
2998 cfs->guarantee_more(2, CHECK); // length
2999 const u2 length = cfs->get_u2_fast();
3000 if (length == 0) {
3001 _methods = Universe::the_empty_method_array();
3002 } else {
3003 _methods = MetadataFactory::new_array<Method*>(_loader_data,
3004 length,
3005 NULL,
3006 CHECK);
3007
3008 for (int index = 0; index < length; index++) {
3009 Method* method = parse_method(cfs,
3010 is_interface,
3011 is_value_type,
3012 _cp,
3013 promoted_flags,
3014 CHECK);
3015
3016 if (method->is_final()) {
3017 *has_final_method = true;
3018 }
3019 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
3020 // used for interface initialization, and default method inheritance analysis
3021 if (is_interface && !(*declares_nonstatic_concrete_methods)
3022 && !method->is_abstract() && !method->is_static()) {
3023 *declares_nonstatic_concrete_methods = true;
3024 }
3025 _methods->at_put(index, method);
3026 }
3027
3028 if (_need_verify && length > 1) {
3029 // Check duplicated methods
3030 ResourceMark rm(THREAD);
3031 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
3032 THREAD, NameSigHash*, HASH_ROW_SIZE);
3033 initialize_hashtable(names_and_sigs);
3034 bool dup = false;
3035 const Symbol* name = NULL;
3036 const Symbol* sig = NULL;
3037 {
3038 debug_only(NoSafepointVerifier nsv;)
3039 for (int i = 0; i < length; i++) {
3040 const Method* const m = _methods->at(i);
3041 name = m->name();
3042 sig = m->signature();
3043 // If no duplicates, add name/signature in hashtable names_and_sigs.
3044 if (!put_after_lookup(name, sig, names_and_sigs)) {
3045 dup = true;
3046 break;
3047 }
3048 }
3049 }
3050 if (dup) {
3051 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
3052 name->as_C_string(), sig->as_klass_external_name(), CHECK);
3053 }
3054 }
3055 }
3056 }
3057
3058 static const intArray* sort_methods(Array<Method*>* methods) {
3059 const int length = methods->length();
3060 // If JVMTI original method ordering or sharing is enabled we have to
3061 // remember the original class file ordering.
3062 // We temporarily use the vtable_index field in the Method* to store the
3063 // class file index, so we can read in after calling qsort.
3064 // Put the method ordering in the shared archive.
3065 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3066 for (int index = 0; index < length; index++) {
3067 Method* const m = methods->at(index);
3068 assert(!m->valid_vtable_index(), "vtable index should not be set");
3069 m->set_vtable_index(index);
3070 }
3071 }
3072 // Sort method array by ascending method name (for faster lookups & vtable construction)
3073 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3074 Method::sort_methods(methods);
3075
3076 intArray* method_ordering = NULL;
3077 // If JVMTI original method ordering or sharing is enabled construct int
3078 // array remembering the original ordering
3079 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3080 method_ordering = new intArray(length, length, -1);
3081 for (int index = 0; index < length; index++) {
3082 Method* const m = methods->at(index);
3083 const int old_index = m->vtable_index();
3084 assert(old_index >= 0 && old_index < length, "invalid method index");
3085 method_ordering->at_put(index, old_index);
3086 m->set_vtable_index(Method::invalid_vtable_index);
3087 }
3088 }
3089 return method_ordering;
3090 }
3091
3092 // Parse generic_signature attribute for methods and fields
3093 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3094 TRAPS) {
3095 assert(cfs != NULL, "invariant");
3096
3097 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3098 const u2 generic_signature_index = cfs->get_u2_fast();
3099 check_property(
3100 valid_symbol_at(generic_signature_index),
3101 "Invalid Signature attribute at constant pool index %u in class file %s",
3102 generic_signature_index, CHECK_0);
3103 return generic_signature_index;
3104 }
3105
3106 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3107 TRAPS) {
3108
3109 assert(cfs != NULL, "invariant");
3110
3111 cfs->guarantee_more(2, CHECK); // sourcefile_index
3112 const u2 sourcefile_index = cfs->get_u2_fast();
3113 check_property(
3114 valid_symbol_at(sourcefile_index),
3115 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3116 sourcefile_index, CHECK);
3117 set_class_sourcefile_index(sourcefile_index);
3118 }
3119
3120 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3121 int length,
3122 TRAPS) {
3123 assert(cfs != NULL, "invariant");
3124
3125 const u1* const sde_buffer = cfs->current();
3126 assert(sde_buffer != NULL, "null sde buffer");
3127
3128 // Don't bother storing it if there is no way to retrieve it
3129 if (JvmtiExport::can_get_source_debug_extension()) {
3130 assert((length+1) > length, "Overflow checking");
3131 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3132 for (int i = 0; i < length; i++) {
3133 sde[i] = sde_buffer[i];
3134 }
3135 sde[length] = '\0';
3136 set_class_sde_buffer((const char*)sde, length);
3137 }
3138 // Got utf8 string, set stream position forward
3139 cfs->skip_u1(length, CHECK);
3140 }
3141
3142
3143 // Inner classes can be static, private or protected (classic VM does this)
3144 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3145 JVM_ACC_PRIVATE | \
3146 JVM_ACC_PROTECTED | \
3147 JVM_ACC_STATIC \
3148 )
3149
3150 // Return number of classes in the inner classes attribute table
3151 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3152 const u1* const inner_classes_attribute_start,
3153 bool parsed_enclosingmethod_attribute,
3154 u2 enclosing_method_class_index,
3155 u2 enclosing_method_method_index,
3156 TRAPS) {
3157 const u1* const current_mark = cfs->current();
3158 u2 length = 0;
3159 if (inner_classes_attribute_start != NULL) {
3160 cfs->set_current(inner_classes_attribute_start);
3161 cfs->guarantee_more(2, CHECK_0); // length
3162 length = cfs->get_u2_fast();
3163 }
3164
3165 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3166 // method data:
3167 // [inner_class_info_index,
3168 // outer_class_info_index,
3169 // inner_name_index,
3170 // inner_class_access_flags,
3171 // ...
3172 // enclosing_method_class_index,
3173 // enclosing_method_method_index]
3174 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3175 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3176 _inner_classes = inner_classes;
3177
3178 int index = 0;
3179 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3180 for (int n = 0; n < length; n++) {
3181 // Inner class index
3182 const u2 inner_class_info_index = cfs->get_u2_fast();
3183 check_property(
3184 valid_klass_reference_at(inner_class_info_index),
3185 "inner_class_info_index %u has bad constant type in class file %s",
3186 inner_class_info_index, CHECK_0);
3187 // Outer class index
3188 const u2 outer_class_info_index = cfs->get_u2_fast();
3189 check_property(
3190 outer_class_info_index == 0 ||
3191 valid_klass_reference_at(outer_class_info_index),
3192 "outer_class_info_index %u has bad constant type in class file %s",
3193 outer_class_info_index, CHECK_0);
3194 // Inner class name
3195 const u2 inner_name_index = cfs->get_u2_fast();
3196 check_property(
3197 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3198 "inner_name_index %u has bad constant type in class file %s",
3199 inner_name_index, CHECK_0);
3200 if (_need_verify) {
3201 guarantee_property(inner_class_info_index != outer_class_info_index,
3202 "Class is both outer and inner class in class file %s", CHECK_0);
3203 }
3204
3205 jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3206 // JVM_ACC_MODULE is defined in JDK-9 and later.
3207 if (_major_version >= JAVA_9_VERSION) {
3208 recognized_modifiers |= JVM_ACC_MODULE;
3209 }
3210 // JVM_ACC_VALUE is defined for class file version 55 and later
3211 if (supports_value_types()) {
3212 recognized_modifiers |= JVM_ACC_VALUE;
3213 }
3214
3215 // Access flags
3216 jint flags = cfs->get_u2_fast() & recognized_modifiers;
3217
3218 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3219 // Set abstract bit for old class files for backward compatibility
3220 flags |= JVM_ACC_ABSTRACT;
3221 }
3222 verify_legal_class_modifiers(flags, CHECK_0);
3223 AccessFlags inner_access_flags(flags);
3224
3225 inner_classes->at_put(index++, inner_class_info_index);
3226 inner_classes->at_put(index++, outer_class_info_index);
3227 inner_classes->at_put(index++, inner_name_index);
3228 inner_classes->at_put(index++, inner_access_flags.as_short());
3229 }
3230
3231 // 4347400: make sure there's no duplicate entry in the classes array
3232 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3233 for(int i = 0; i < length * 4; i += 4) {
3234 for(int j = i + 4; j < length * 4; j += 4) {
3235 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3236 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3237 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3238 inner_classes->at(i+3) != inner_classes->at(j+3)),
3239 "Duplicate entry in InnerClasses in class file %s",
3240 CHECK_0);
3241 }
3242 }
3243 }
3244
3245 // Set EnclosingMethod class and method indexes.
3246 if (parsed_enclosingmethod_attribute) {
3247 inner_classes->at_put(index++, enclosing_method_class_index);
3248 inner_classes->at_put(index++, enclosing_method_method_index);
3249 }
3250 assert(index == size, "wrong size");
3251
3252 // Restore buffer's current position.
3253 cfs->set_current(current_mark);
3254
3255 return length;
3256 }
3257
3258 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3259 const u1* const nest_members_attribute_start,
3260 TRAPS) {
3261 const u1* const current_mark = cfs->current();
3262 u2 length = 0;
3263 if (nest_members_attribute_start != NULL) {
3264 cfs->set_current(nest_members_attribute_start);
3265 cfs->guarantee_more(2, CHECK_0); // length
3266 length = cfs->get_u2_fast();
3267 }
3268 const int size = length;
3269 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3270 _nest_members = nest_members;
3271
3272 int index = 0;
3273 cfs->guarantee_more(2 * length, CHECK_0);
3274 for (int n = 0; n < length; n++) {
3275 const u2 class_info_index = cfs->get_u2_fast();
3276 check_property(
3277 valid_klass_reference_at(class_info_index),
3278 "Nest member class_info_index %u has bad constant type in class file %s",
3279 class_info_index, CHECK_0);
3280 nest_members->at_put(index++, class_info_index);
3281 }
3282 assert(index == size, "wrong size");
3283
3284 // Restore buffer's current position.
3285 cfs->set_current(current_mark);
3286
3287 return length;
3288 }
3289
3290 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3291 set_class_synthetic_flag(true);
3292 }
3293
3294 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3295 assert(cfs != NULL, "invariant");
3296
3297 const u2 signature_index = cfs->get_u2(CHECK);
3298 check_property(
3299 valid_symbol_at(signature_index),
3300 "Invalid constant pool index %u in Signature attribute in class file %s",
3301 signature_index, CHECK);
3302 set_class_generic_signature_index(signature_index);
3303 }
3304
3305 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3306 ConstantPool* cp,
3307 u4 attribute_byte_length,
3308 TRAPS) {
3309 assert(cfs != NULL, "invariant");
3310 assert(cp != NULL, "invariant");
3311
3312 const u1* const current_start = cfs->current();
3313
3314 guarantee_property(attribute_byte_length >= sizeof(u2),
3315 "Invalid BootstrapMethods attribute length %u in class file %s",
3316 attribute_byte_length,
3317 CHECK);
3318
3319 cfs->guarantee_more(attribute_byte_length, CHECK);
3320
3321 const int attribute_array_length = cfs->get_u2_fast();
3322
3323 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3324 "Short length on BootstrapMethods in class file %s",
3325 CHECK);
3326
3327
3328 // The attribute contains a counted array of counted tuples of shorts,
3329 // represending bootstrap specifiers:
3330 // length*{bootstrap_method_index, argument_count*{argument_index}}
3331 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3332 // operand_count = number of shorts in attr, except for leading length
3333
3334 // The attribute is copied into a short[] array.
3335 // The array begins with a series of short[2] pairs, one for each tuple.
3336 const int index_size = (attribute_array_length * 2);
3337
3338 Array<u2>* const operands =
3339 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3340
3341 // Eagerly assign operands so they will be deallocated with the constant
3342 // pool if there is an error.
3343 cp->set_operands(operands);
3344
3345 int operand_fill_index = index_size;
3346 const int cp_size = cp->length();
3347
3348 for (int n = 0; n < attribute_array_length; n++) {
3349 // Store a 32-bit offset into the header of the operand array.
3350 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3351
3352 // Read a bootstrap specifier.
3353 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3354 const u2 bootstrap_method_index = cfs->get_u2_fast();
3355 const u2 argument_count = cfs->get_u2_fast();
3356 check_property(
3357 valid_cp_range(bootstrap_method_index, cp_size) &&
3358 cp->tag_at(bootstrap_method_index).is_method_handle(),
3359 "bootstrap_method_index %u has bad constant type in class file %s",
3360 bootstrap_method_index,
3361 CHECK);
3362
3363 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3364 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3365 CHECK);
3366
3367 operands->at_put(operand_fill_index++, bootstrap_method_index);
3368 operands->at_put(operand_fill_index++, argument_count);
3369
3370 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3371 for (int j = 0; j < argument_count; j++) {
3372 const u2 argument_index = cfs->get_u2_fast();
3373 check_property(
3374 valid_cp_range(argument_index, cp_size) &&
3375 cp->tag_at(argument_index).is_loadable_constant(),
3376 "argument_index %u has bad constant type in class file %s",
3377 argument_index,
3378 CHECK);
3379 operands->at_put(operand_fill_index++, argument_index);
3380 }
3381 }
3382 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3383 "Bad length on BootstrapMethods in class file %s",
3384 CHECK);
3385 }
3386
3387 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3388 ConstantPool* cp,
3389 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3390 TRAPS) {
3391 assert(cfs != NULL, "invariant");
3392 assert(cp != NULL, "invariant");
3393 assert(parsed_annotations != NULL, "invariant");
3394
3395 // Set inner classes attribute to default sentinel
3396 _inner_classes = Universe::the_empty_short_array();
3397 // Set nest members attribute to default sentinel
3398 _nest_members = Universe::the_empty_short_array();
3399 cfs->guarantee_more(2, CHECK); // attributes_count
3400 u2 attributes_count = cfs->get_u2_fast();
3401 bool parsed_sourcefile_attribute = false;
3402 bool parsed_innerclasses_attribute = false;
3403 bool parsed_nest_members_attribute = false;
3404 bool parsed_nest_host_attribute = false;
3405 bool parsed_enclosingmethod_attribute = false;
3406 bool parsed_bootstrap_methods_attribute = false;
3407 const u1* runtime_visible_annotations = NULL;
3408 int runtime_visible_annotations_length = 0;
3409 const u1* runtime_invisible_annotations = NULL;
3410 int runtime_invisible_annotations_length = 0;
3411 const u1* runtime_visible_type_annotations = NULL;
3412 int runtime_visible_type_annotations_length = 0;
3413 const u1* runtime_invisible_type_annotations = NULL;
3414 int runtime_invisible_type_annotations_length = 0;
3415 bool runtime_invisible_type_annotations_exists = false;
3416 bool runtime_invisible_annotations_exists = false;
3417 bool parsed_source_debug_ext_annotations_exist = false;
3418 const u1* inner_classes_attribute_start = NULL;
3419 u4 inner_classes_attribute_length = 0;
3420 const u1* value_types_attribute_start = NULL;
3421 u4 value_types_attribute_length = 0;
3422 u2 enclosing_method_class_index = 0;
3423 u2 enclosing_method_method_index = 0;
3424 const u1* nest_members_attribute_start = NULL;
3425 u4 nest_members_attribute_length = 0;
3426
3427 // Iterate over attributes
3428 while (attributes_count--) {
3429 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3430 const u2 attribute_name_index = cfs->get_u2_fast();
3431 const u4 attribute_length = cfs->get_u4_fast();
3432 check_property(
3433 valid_symbol_at(attribute_name_index),
3434 "Attribute name has bad constant pool index %u in class file %s",
3435 attribute_name_index, CHECK);
3436 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3437 if (tag == vmSymbols::tag_source_file()) {
3438 // Check for SourceFile tag
3439 if (_need_verify) {
3440 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3441 }
3442 if (parsed_sourcefile_attribute) {
3443 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3444 } else {
3445 parsed_sourcefile_attribute = true;
3446 }
3447 parse_classfile_sourcefile_attribute(cfs, CHECK);
3448 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3449 // Check for SourceDebugExtension tag
3450 if (parsed_source_debug_ext_annotations_exist) {
3451 classfile_parse_error(
3452 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3453 }
3454 parsed_source_debug_ext_annotations_exist = true;
3455 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3456 } else if (tag == vmSymbols::tag_inner_classes()) {
3457 // Check for InnerClasses tag
3458 if (parsed_innerclasses_attribute) {
3459 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3460 } else {
3461 parsed_innerclasses_attribute = true;
3462 }
3463 inner_classes_attribute_start = cfs->current();
3464 inner_classes_attribute_length = attribute_length;
3465 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3466 } else if (tag == vmSymbols::tag_synthetic()) {
3467 // Check for Synthetic tag
3468 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3469 if (attribute_length != 0) {
3470 classfile_parse_error(
3471 "Invalid Synthetic classfile attribute length %u in class file %s",
3472 attribute_length, CHECK);
3473 }
3474 parse_classfile_synthetic_attribute(CHECK);
3475 } else if (tag == vmSymbols::tag_deprecated()) {
3476 // Check for Deprecatd tag - 4276120
3477 if (attribute_length != 0) {
3478 classfile_parse_error(
3479 "Invalid Deprecated classfile attribute length %u in class file %s",
3480 attribute_length, CHECK);
3481 }
3482 } else if (_major_version >= JAVA_1_5_VERSION) {
3483 if (tag == vmSymbols::tag_signature()) {
3484 if (_generic_signature_index != 0) {
3485 classfile_parse_error(
3486 "Multiple Signature attributes in class file %s", CHECK);
3487 }
3488 if (attribute_length != 2) {
3489 classfile_parse_error(
3490 "Wrong Signature attribute length %u in class file %s",
3491 attribute_length, CHECK);
3492 }
3493 parse_classfile_signature_attribute(cfs, CHECK);
3494 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3495 if (runtime_visible_annotations != NULL) {
3496 classfile_parse_error(
3497 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3498 }
3499 runtime_visible_annotations_length = attribute_length;
3500 runtime_visible_annotations = cfs->current();
3501 assert(runtime_visible_annotations != NULL, "null visible annotations");
3502 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3503 parse_annotations(cp,
3504 runtime_visible_annotations,
3505 runtime_visible_annotations_length,
3506 parsed_annotations,
3507 _loader_data,
3508 CHECK);
3509 cfs->skip_u1_fast(runtime_visible_annotations_length);
3510 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3511 if (runtime_invisible_annotations_exists) {
3512 classfile_parse_error(
3513 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3514 }
3515 runtime_invisible_annotations_exists = true;
3516 if (PreserveAllAnnotations) {
3517 runtime_invisible_annotations_length = attribute_length;
3518 runtime_invisible_annotations = cfs->current();
3519 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3520 }
3521 cfs->skip_u1(attribute_length, CHECK);
3522 } else if (tag == vmSymbols::tag_enclosing_method()) {
3523 if (parsed_enclosingmethod_attribute) {
3524 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3525 } else {
3526 parsed_enclosingmethod_attribute = true;
3527 }
3528 guarantee_property(attribute_length == 4,
3529 "Wrong EnclosingMethod attribute length %u in class file %s",
3530 attribute_length, CHECK);
3531 cfs->guarantee_more(4, CHECK); // class_index, method_index
3532 enclosing_method_class_index = cfs->get_u2_fast();
3533 enclosing_method_method_index = cfs->get_u2_fast();
3534 if (enclosing_method_class_index == 0) {
3535 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3536 }
3537 // Validate the constant pool indices and types
3538 check_property(valid_klass_reference_at(enclosing_method_class_index),
3539 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3540 if (enclosing_method_method_index != 0 &&
3541 (!cp->is_within_bounds(enclosing_method_method_index) ||
3542 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3543 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3544 }
3545 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3546 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3547 if (parsed_bootstrap_methods_attribute) {
3548 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3549 }
3550 parsed_bootstrap_methods_attribute = true;
3551 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3552 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3553 if (runtime_visible_type_annotations != NULL) {
3554 classfile_parse_error(
3555 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3556 }
3557 runtime_visible_type_annotations_length = attribute_length;
3558 runtime_visible_type_annotations = cfs->current();
3559 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3560 // No need for the VM to parse Type annotations
3561 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3562 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3563 if (runtime_invisible_type_annotations_exists) {
3564 classfile_parse_error(
3565 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3566 } else {
3567 runtime_invisible_type_annotations_exists = true;
3568 }
3569 if (PreserveAllAnnotations) {
3570 runtime_invisible_type_annotations_length = attribute_length;
3571 runtime_invisible_type_annotations = cfs->current();
3572 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3573 }
3574 cfs->skip_u1(attribute_length, CHECK);
3575 } else if (_major_version >= JAVA_11_VERSION) {
3576 if (tag == vmSymbols::tag_nest_members()) {
3577 // Check for NestMembers tag
3578 if (parsed_nest_members_attribute) {
3579 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK);
3580 } else {
3581 parsed_nest_members_attribute = true;
3582 }
3583 if (parsed_nest_host_attribute) {
3584 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK);
3585 }
3586 nest_members_attribute_start = cfs->current();
3587 nest_members_attribute_length = attribute_length;
3588 cfs->skip_u1(nest_members_attribute_length, CHECK);
3589 } else if (tag == vmSymbols::tag_nest_host()) {
3590 if (parsed_nest_host_attribute) {
3591 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK);
3592 } else {
3593 parsed_nest_host_attribute = true;
3594 }
3595 if (parsed_nest_members_attribute) {
3596 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK);
3597 }
3598 if (_need_verify) {
3599 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3600 }
3601 cfs->guarantee_more(2, CHECK);
3602 u2 class_info_index = cfs->get_u2_fast();
3603 check_property(
3604 valid_klass_reference_at(class_info_index),
3605 "Nest-host class_info_index %u has bad constant type in class file %s",
3606 class_info_index, CHECK);
3607 _nest_host = class_info_index;
3608 } else {
3609 // Unknown attribute
3610 cfs->skip_u1(attribute_length, CHECK);
3611 }
3612 } else {
3613 // Unknown attribute
3614 cfs->skip_u1(attribute_length, CHECK);
3615 }
3616 } else {
3617 // Unknown attribute
3618 cfs->skip_u1(attribute_length, CHECK);
3619 }
3620 }
3621 _annotations = assemble_annotations(runtime_visible_annotations,
3622 runtime_visible_annotations_length,
3623 runtime_invisible_annotations,
3624 runtime_invisible_annotations_length,
3625 CHECK);
3626 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3627 runtime_visible_type_annotations_length,
3628 runtime_invisible_type_annotations,
3629 runtime_invisible_type_annotations_length,
3630 CHECK);
3631
3632 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3633 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3634 cfs,
3635 inner_classes_attribute_start,
3636 parsed_innerclasses_attribute,
3637 enclosing_method_class_index,
3638 enclosing_method_method_index,
3639 CHECK);
3640 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3641 guarantee_property(
3642 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3643 "Wrong InnerClasses attribute length in class file %s", CHECK);
3644 }
3645 }
3646
3647 if (parsed_nest_members_attribute) {
3648 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3649 cfs,
3650 nest_members_attribute_start,
3651 CHECK);
3652 if (_need_verify) {
3653 guarantee_property(
3654 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3655 "Wrong NestMembers attribute length in class file %s", CHECK);
3656 }
3657 }
3658
3659 if (_max_bootstrap_specifier_index >= 0) {
3660 guarantee_property(parsed_bootstrap_methods_attribute,
3661 "Missing BootstrapMethods attribute in class file %s", CHECK);
3662 }
3663 }
3664
3665 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3666 assert(k != NULL, "invariant");
3667
3668 if (_synthetic_flag)
3669 k->set_is_synthetic();
3670 if (_sourcefile_index != 0) {
3671 k->set_source_file_name_index(_sourcefile_index);
3672 }
3673 if (_generic_signature_index != 0) {
3674 k->set_generic_signature_index(_generic_signature_index);
3675 }
3676 if (_sde_buffer != NULL) {
3677 k->set_source_debug_extension(_sde_buffer, _sde_length);
3678 }
3679 }
3680
3681 // Create the Annotations object that will
3682 // hold the annotations array for the Klass.
3683 void ClassFileParser::create_combined_annotations(TRAPS) {
3684 if (_annotations == NULL &&
3685 _type_annotations == NULL &&
3686 _fields_annotations == NULL &&
3687 _fields_type_annotations == NULL) {
3688 // Don't create the Annotations object unnecessarily.
3689 return;
3690 }
3691
3692 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3693 annotations->set_class_annotations(_annotations);
3694 annotations->set_class_type_annotations(_type_annotations);
3695 annotations->set_fields_annotations(_fields_annotations);
3696 annotations->set_fields_type_annotations(_fields_type_annotations);
3697
3698 // This is the Annotations object that will be
3699 // assigned to InstanceKlass being constructed.
3700 _combined_annotations = annotations;
3701
3702 // The annotations arrays below has been transfered the
3703 // _combined_annotations so these fields can now be cleared.
3704 _annotations = NULL;
3705 _type_annotations = NULL;
3706 _fields_annotations = NULL;
3707 _fields_type_annotations = NULL;
3708 }
3709
3710 // Transfer ownership of metadata allocated to the InstanceKlass.
3711 void ClassFileParser::apply_parsed_class_metadata(
3712 InstanceKlass* this_klass,
3713 int java_fields_count, TRAPS) {
3714 assert(this_klass != NULL, "invariant");
3715
3716 _cp->set_pool_holder(this_klass);
3717 this_klass->set_constants(_cp);
3718 this_klass->set_fields(_fields, java_fields_count);
3719 this_klass->set_methods(_methods);
3720 this_klass->set_inner_classes(_inner_classes);
3721 this_klass->set_nest_members(_nest_members);
3722 this_klass->set_nest_host_index(_nest_host);
3723 this_klass->set_local_interfaces(_local_interfaces);
3724 this_klass->set_annotations(_combined_annotations);
3725 // Delay the setting of _transitive_interfaces until after initialize_supers() in
3726 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with
3727 // its _super. If an OOM occurs while loading the current klass, its _super field
3728 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3729 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3730 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3731
3732 // Clear out these fields so they don't get deallocated by the destructor
3733 clear_class_metadata();
3734 }
3735
3736 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3737 int runtime_visible_annotations_length,
3738 const u1* const runtime_invisible_annotations,
3739 int runtime_invisible_annotations_length,
3740 TRAPS) {
3741 AnnotationArray* annotations = NULL;
3742 if (runtime_visible_annotations != NULL ||
3743 runtime_invisible_annotations != NULL) {
3744 annotations = MetadataFactory::new_array<u1>(_loader_data,
3745 runtime_visible_annotations_length +
3746 runtime_invisible_annotations_length,
3747 CHECK_(annotations));
3748 if (runtime_visible_annotations != NULL) {
3749 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3750 annotations->at_put(i, runtime_visible_annotations[i]);
3751 }
3752 }
3753 if (runtime_invisible_annotations != NULL) {
3754 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3755 int append = runtime_visible_annotations_length+i;
3756 annotations->at_put(append, runtime_invisible_annotations[i]);
3757 }
3758 }
3759 }
3760 return annotations;
3761 }
3762
3763 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3764 const int super_class_index,
3765 const bool need_verify,
3766 TRAPS) {
3767 assert(cp != NULL, "invariant");
3768 const InstanceKlass* super_klass = NULL;
3769
3770 if (super_class_index == 0) {
3771 check_property(_class_name == vmSymbols::java_lang_Object()
3772 || (_access_flags.get_flags() & JVM_ACC_VALUE),
3773 "Invalid superclass index %u in class file %s",
3774 super_class_index,
3775 CHECK_NULL);
3776 } else {
3777 check_property(valid_klass_reference_at(super_class_index),
3778 "Invalid superclass index %u in class file %s",
3779 super_class_index,
3780 CHECK_NULL);
3781 // The class name should be legal because it is checked when parsing constant pool.
3782 // However, make sure it is not an array type.
3783 bool is_array = false;
3784 if (cp->tag_at(super_class_index).is_klass()) {
3785 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3786 if (need_verify)
3787 is_array = super_klass->is_array_klass();
3788 } else if (need_verify) {
3789 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3790 }
3791 if (need_verify) {
3792 guarantee_property(!is_array,
3793 "Bad superclass name in class file %s", CHECK_NULL);
3794 }
3795 }
3796 return super_klass;
3797 }
3798
3799 #ifndef PRODUCT
3800 static void print_field_layout(const Symbol* name,
3801 Array<u2>* fields,
3802 const constantPoolHandle& cp,
3803 int instance_size,
3804 int instance_fields_start,
3805 int instance_fields_end,
3806 int static_fields_end) {
3807
3808 assert(name != NULL, "invariant");
3809
3810 tty->print("%s: field layout\n", name->as_klass_external_name());
3811 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3812 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3813 if (!fs.access_flags().is_static()) {
3814 tty->print(" @%3d \"%s\" %s\n",
3815 fs.offset(),
3816 fs.name()->as_klass_external_name(),
3817 fs.signature()->as_klass_external_name());
3818 }
3819 }
3820 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3821 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3822 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3823 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3824 if (fs.access_flags().is_static()) {
3825 tty->print(" @%3d \"%s\" %s\n",
3826 fs.offset(),
3827 fs.name()->as_klass_external_name(),
3828 fs.signature()->as_klass_external_name());
3829 }
3830 }
3831 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3832 tty->print("\n");
3833 }
3834 #endif
3835
3836 // Values needed for oopmap and InstanceKlass creation
3837 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3838 public:
3839 OopMapBlocksBuilder* oop_map_blocks;
3840 int instance_size;
3841 int nonstatic_field_size;
3842 int static_field_size;
3843 bool has_nonstatic_fields;
3844 };
3845
3846 // Utility to collect and compact oop maps during layout
3847 class ClassFileParser::OopMapBlocksBuilder : public ResourceObj {
3848 public:
3849 OopMapBlock* nonstatic_oop_maps;
3850 unsigned int nonstatic_oop_map_count;
3851 unsigned int max_nonstatic_oop_maps;
3852
3853 public:
3854 OopMapBlocksBuilder(unsigned int max_blocks, TRAPS) {
3855 max_nonstatic_oop_maps = max_blocks;
3856 nonstatic_oop_map_count = 0;
3857 if (max_blocks == 0) {
3858 nonstatic_oop_maps = NULL;
3859 } else {
3860 nonstatic_oop_maps = NEW_RESOURCE_ARRAY_IN_THREAD(
3861 THREAD, OopMapBlock, max_nonstatic_oop_maps);
3862 memset(nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3863 }
3864 }
3865
3866 OopMapBlock* last_oop_map() const {
3867 assert(nonstatic_oop_map_count > 0, "Has no oop maps");
3868 return nonstatic_oop_maps + (nonstatic_oop_map_count - 1);
3869 }
3870
3871 // addition of super oop maps
3872 void initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3873 assert(nof_blocks && nonstatic_oop_map_count == 0 &&
3874 nof_blocks <= max_nonstatic_oop_maps, "invariant");
3875
3876 memcpy(nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3877 nonstatic_oop_map_count += nof_blocks;
3878 }
3879
3880 // collection of oops
3881 void add(int offset, int count) {
3882 if (nonstatic_oop_map_count == 0) {
3883 nonstatic_oop_map_count++;
3884 }
3885 OopMapBlock* nonstatic_oop_map = last_oop_map();
3886 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
3887 nonstatic_oop_map->set_offset(offset);
3888 nonstatic_oop_map->set_count(count);
3889 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
3890 nonstatic_oop_map->increment_count(count);
3891 } else { // Need a new one...
3892 nonstatic_oop_map_count++;
3893 assert(nonstatic_oop_map_count <= max_nonstatic_oop_maps, "range check");
3894 nonstatic_oop_map = last_oop_map();
3895 nonstatic_oop_map->set_offset(offset);
3896 nonstatic_oop_map->set_count(count);
3897 }
3898 }
3899
3900 // general purpose copy, e.g. into allocated instanceKlass
3901 void copy(OopMapBlock* dst) {
3902 if (nonstatic_oop_map_count != 0) {
3903 memcpy(dst, nonstatic_oop_maps, sizeof(OopMapBlock) * nonstatic_oop_map_count);
3904 }
3905 }
3906
3907 // Sort and compact adjacent blocks
3908 void compact(TRAPS) {
3909 if (nonstatic_oop_map_count <= 1) {
3910 return;
3911 }
3912 /*
3913 * Since field layout sneeks in oops before values, we will be able to condense
3914 * blocks. There is potential to compact between super, own refs and values
3915 * containing refs.
3916 *
3917 * Currently compaction is slightly limited due to values being 8 byte aligned.
3918 * This may well change: FixMe if doesn't, the code below is fairly general purpose
3919 * and maybe it doesn't need to be.
3920 */
3921 qsort(nonstatic_oop_maps, nonstatic_oop_map_count, sizeof(OopMapBlock),
3922 (_sort_Fn)OopMapBlock::compare_offset);
3923 if (nonstatic_oop_map_count < 2) {
3924 return;
3925 }
3926
3927 //Make a temp copy, and iterate through and copy back into the orig
3928 ResourceMark rm(THREAD);
3929 OopMapBlock* oop_maps_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, OopMapBlock,
3930 nonstatic_oop_map_count);
3931 OopMapBlock* oop_maps_copy_end = oop_maps_copy + nonstatic_oop_map_count;
3932 copy(oop_maps_copy);
3933 OopMapBlock* nonstatic_oop_map = nonstatic_oop_maps;
3934 unsigned int new_count = 1;
3935 oop_maps_copy++;
3936 while(oop_maps_copy < oop_maps_copy_end) {
3937 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
3938 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
3939 nonstatic_oop_map->increment_count(oop_maps_copy->count());
3940 } else {
3941 nonstatic_oop_map++;
3942 new_count++;
3943 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
3944 nonstatic_oop_map->set_count(oop_maps_copy->count());
3945 }
3946 oop_maps_copy++;
3947 }
3948 assert(new_count <= nonstatic_oop_map_count, "end up with more maps after compact() ?");
3949 nonstatic_oop_map_count = new_count;
3950 }
3951
3952 void print_on(outputStream* st) const {
3953 st->print_cr(" OopMapBlocks: %3d /%3d", nonstatic_oop_map_count, max_nonstatic_oop_maps);
3954 if (nonstatic_oop_map_count > 0) {
3955 OopMapBlock* map = nonstatic_oop_maps;
3956 OopMapBlock* last_map = last_oop_map();
3957 assert(map <= last_map, "Last less than first");
3958 while (map <= last_map) {
3959 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
3960 map->offset() + map->offset_span() - heapOopSize, map->count());
3961 map++;
3962 }
3963 }
3964 }
3965
3966 void print_value_on(outputStream* st) const {
3967 print_on(st);
3968 }
3969
3970 };
3971
3972 void ClassFileParser::throwValueTypeLimitation(THREAD_AND_LOCATION_DECL,
3973 const char* msg,
3974 const Symbol* name,
3975 const Symbol* sig) const {
3976
3977 ResourceMark rm(THREAD);
3978 if (name == NULL || sig == NULL) {
3979 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
3980 vmSymbols::java_lang_ClassFormatError(),
3981 "class: %s - %s", _class_name->as_C_string(), msg);
3982 }
3983 else {
3984 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
3985 vmSymbols::java_lang_ClassFormatError(),
3986 "\"%s\" sig: \"%s\" class: %s - %s", name->as_C_string(), sig->as_C_string(),
3987 _class_name->as_C_string(), msg);
3988 }
3989 }
3990
3991 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3992 void ClassFileParser::layout_fields(ConstantPool* cp,
3993 const FieldAllocationCount* fac,
3994 const ClassAnnotationCollector* parsed_annotations,
3995 FieldLayoutInfo* info,
3996 TRAPS) {
3997
3998 assert(cp != NULL, "invariant");
3999
4000 // Field size and offset computation
4001 int nonstatic_field_size = _super_klass == NULL ? 0 :
4002 _super_klass->nonstatic_field_size();
4003 int next_nonstatic_valuetype_offset = 0;
4004 int first_nonstatic_valuetype_offset = 0;
4005
4006 // Fields that are value types are handled differently depending if they are static or not:
4007 // - static fields are oops
4008 // - non-static fields are embedded
4009
4010 // Count the contended fields by type.
4011 //
4012 // We ignore static fields, because @Contended is not supported for them.
4013 // The layout code below will also ignore the static fields.
4014 int nonstatic_contended_count = 0;
4015 FieldAllocationCount fac_contended;
4016 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4017 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4018 if (fs.is_contended()) {
4019 fac_contended.count[atype]++;
4020 if (!fs.access_flags().is_static()) {
4021 nonstatic_contended_count++;
4022 }
4023 }
4024 }
4025
4026
4027 // Calculate the starting byte offsets
4028 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
4029 // Value types in static fields are not embedded, they are handled with oops
4030 int next_static_double_offset = next_static_oop_offset +
4031 ((fac->count[STATIC_OOP] + fac->count[STATIC_FLATTENABLE]) * heapOopSize);
4032 if (fac->count[STATIC_DOUBLE]) {
4033 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
4034 }
4035
4036 int next_static_word_offset = next_static_double_offset +
4037 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
4038 int next_static_short_offset = next_static_word_offset +
4039 ((fac->count[STATIC_WORD]) * BytesPerInt);
4040 int next_static_byte_offset = next_static_short_offset +
4041 ((fac->count[STATIC_SHORT]) * BytesPerShort);
4042
4043 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
4044 nonstatic_field_size * heapOopSize;
4045
4046 // First field of value types is aligned on a long boundary in order to ease
4047 // in-lining of value types (with header removal) in packed arrays and
4048 // flatten value types
4049 int initial_value_type_padding = 0;
4050 if (is_value_type()) {
4051 int old = nonstatic_fields_start;
4052 nonstatic_fields_start = align_up(nonstatic_fields_start, BytesPerLong);
4053 initial_value_type_padding = nonstatic_fields_start - old;
4054 }
4055
4056 int next_nonstatic_field_offset = nonstatic_fields_start;
4057
4058 const bool is_contended_class = parsed_annotations->is_contended();
4059
4060 // Class is contended, pad before all the fields
4061 if (is_contended_class) {
4062 next_nonstatic_field_offset += ContendedPaddingWidth;
4063 }
4064
4065 // Temporary value types restrictions
4066 if (is_value_type()) {
4067 if (is_contended_class) {
4068 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support @Contended annotation yet");
4069 return;
4070 }
4071 }
4072
4073 // Compute the non-contended fields count.
4074 // The packing code below relies on these counts to determine if some field
4075 // can be squeezed into the alignment gap. Contended fields are obviously
4076 // exempt from that.
4077 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
4078 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
4079 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
4080 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
4081 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
4082
4083 int static_value_type_count = 0;
4084 int nonstatic_value_type_count = 0;
4085 int* nonstatic_value_type_indexes = NULL;
4086 Klass** nonstatic_value_type_klasses = NULL;
4087 unsigned int value_type_oop_map_count = 0;
4088 int not_flattened_value_types = 0;
4089
4090 int max_nonstatic_value_type = fac->count[NONSTATIC_FLATTENABLE] + 1;
4091
4092 nonstatic_value_type_indexes = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, int,
4093 max_nonstatic_value_type);
4094 for (int i = 0; i < max_nonstatic_value_type; i++) {
4095 nonstatic_value_type_indexes[i] = -1;
4096 }
4097 nonstatic_value_type_klasses = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, Klass*,
4098 max_nonstatic_value_type);
4099
4100 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
4101 if (fs.allocation_type() == STATIC_FLATTENABLE) {
4102 // Pre-resolve the flattenable field and check for value type circularity
4103 // issues. Note that super-class circularity checks are not needed here
4104 // because flattenable fields can only be in value types and value types
4105 // only have java.lang.Object as their super class.
4106 // Also, note that super-interface circularity checks are not needed
4107 // because interfaces cannot be value types.
4108 ResourceMark rm;
4109 if (!fs.signature()->is_Q_signature()) {
4110 THROW(vmSymbols::java_lang_ClassFormatError());
4111 }
4112 Klass* klass =
4113 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4114 Handle(THREAD, _loader_data->class_loader()),
4115 _protection_domain, true, CHECK);
4116 assert(klass != NULL, "Sanity check");
4117 if (!klass->access_flags().is_value_type()) {
4118 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4119 }
4120 static_value_type_count++;
4121 } else if (fs.allocation_type() == NONSTATIC_FLATTENABLE) {
4122 // Pre-resolve the flattenable field and check for value type circularity issues.
4123 ResourceMark rm;
4124 if (!fs.signature()->is_Q_signature()) {
4125 THROW(vmSymbols::java_lang_ClassFormatError());
4126 }
4127 Klass* klass =
4128 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4129 Handle(THREAD, _loader_data->class_loader()),
4130 _protection_domain, true, CHECK);
4131 assert(klass != NULL, "Sanity check");
4132 if (!klass->access_flags().is_value_type()) {
4133 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4134 }
4135 ValueKlass* vk = ValueKlass::cast(klass);
4136 // Conditions to apply flattening or not should be defined in a single place
4137 if ((ValueFieldMaxFlatSize < 0) || (vk->size_helper() * HeapWordSize) <= ValueFieldMaxFlatSize) {
4138 nonstatic_value_type_indexes[nonstatic_value_type_count] = fs.index();
4139 nonstatic_value_type_klasses[nonstatic_value_type_count] = klass;
4140 nonstatic_value_type_count++;
4141
4142 ValueKlass* vklass = ValueKlass::cast(klass);
4143 if (vklass->contains_oops()) {
4144 value_type_oop_map_count += vklass->nonstatic_oop_map_count();
4145 }
4146 fs.set_flattened(true);
4147 } else {
4148 not_flattened_value_types++;
4149 fs.set_flattened(false);
4150 }
4151 }
4152 }
4153
4154 // Adjusting non_static_oop_count to take into account not flattened value types;
4155 nonstatic_oop_count += not_flattened_value_types;
4156
4157 // Total non-static fields count, including every contended field
4158 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
4159 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
4160 fac->count[NONSTATIC_OOP] + fac->count[NONSTATIC_FLATTENABLE];
4161
4162 const bool super_has_nonstatic_fields =
4163 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
4164 const bool has_nonstatic_fields =
4165 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
4166 const bool has_nonstatic_value_fields = nonstatic_value_type_count > 0;
4167
4168 if (is_value_type() && (!has_nonstatic_fields)) {
4169 // There are a number of fixes required throughout the type system and JIT
4170 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support zero instance size yet");
4171 return;
4172 }
4173
4174 // Prepare list of oops for oop map generation.
4175 //
4176 // "offset" and "count" lists are describing the set of contiguous oop
4177 // regions. offset[i] is the start of the i-th region, which then has
4178 // count[i] oops following. Before we know how many regions are required,
4179 // we pessimistically allocate the maps to fit all the oops into the
4180 // distinct regions.
4181 //
4182 int super_oop_map_count = (_super_klass == NULL) ? 0 :_super_klass->nonstatic_oop_map_count();
4183 int max_oop_map_count =
4184 super_oop_map_count +
4185 fac->count[NONSTATIC_OOP] +
4186 value_type_oop_map_count +
4187 not_flattened_value_types;
4188
4189 OopMapBlocksBuilder* nonstatic_oop_maps = new OopMapBlocksBuilder(max_oop_map_count, THREAD);
4190 if (super_oop_map_count > 0) {
4191 nonstatic_oop_maps->initialize_inherited_blocks(_super_klass->start_of_nonstatic_oop_maps(),
4192 _super_klass->nonstatic_oop_map_count());
4193 }
4194
4195 int first_nonstatic_oop_offset = 0; // will be set for first oop field
4196
4197 bool compact_fields = CompactFields;
4198 int allocation_style = FieldsAllocationStyle;
4199 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
4200 assert(false, "0 <= FieldsAllocationStyle <= 2");
4201 allocation_style = 1; // Optimistic
4202 }
4203
4204 // The next classes have predefined hard-coded fields offsets
4205 // (see in JavaClasses::compute_hard_coded_offsets()).
4206 // Use default fields allocation order for them.
4207 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
4208 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
4209 _class_name == vmSymbols::java_lang_Class() ||
4210 _class_name == vmSymbols::java_lang_ClassLoader() ||
4211 _class_name == vmSymbols::java_lang_ref_Reference() ||
4212 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
4213 _class_name == vmSymbols::java_lang_StackTraceElement() ||
4214 _class_name == vmSymbols::java_lang_String() ||
4215 _class_name == vmSymbols::java_lang_Throwable() ||
4216 _class_name == vmSymbols::java_lang_Boolean() ||
4217 _class_name == vmSymbols::java_lang_Character() ||
4218 _class_name == vmSymbols::java_lang_Float() ||
4219 _class_name == vmSymbols::java_lang_Double() ||
4220 _class_name == vmSymbols::java_lang_Byte() ||
4221 _class_name == vmSymbols::java_lang_Short() ||
4222 _class_name == vmSymbols::java_lang_Integer() ||
4223 _class_name == vmSymbols::java_lang_Long())) {
4224 allocation_style = 0; // Allocate oops first
4225 compact_fields = false; // Don't compact fields
4226 }
4227
4228 int next_nonstatic_oop_offset = 0;
4229 int next_nonstatic_double_offset = 0;
4230
4231 // Rearrange fields for a given allocation style
4232 if( allocation_style == 0 ) {
4233 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
4234 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4235 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4236 (nonstatic_oop_count * heapOopSize);
4237 } else if( allocation_style == 1 ) {
4238 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
4239 next_nonstatic_double_offset = next_nonstatic_field_offset;
4240 } else if( allocation_style == 2 ) {
4241 // Fields allocation: oops fields in super and sub classes are together.
4242 if( nonstatic_field_size > 0 && super_oop_map_count > 0 ) {
4243 if (next_nonstatic_field_offset == nonstatic_oop_maps->last_oop_map()->end_offset()) {
4244 allocation_style = 0; // allocate oops first
4245 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4246 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4247 (nonstatic_oop_count * heapOopSize);
4248 }
4249 }
4250 if( allocation_style == 2 ) {
4251 allocation_style = 1; // allocate oops last
4252 next_nonstatic_double_offset = next_nonstatic_field_offset;
4253 }
4254 } else {
4255 ShouldNotReachHere();
4256 }
4257
4258 int nonstatic_oop_space_count = 0;
4259 int nonstatic_word_space_count = 0;
4260 int nonstatic_short_space_count = 0;
4261 int nonstatic_byte_space_count = 0;
4262 int nonstatic_oop_space_offset = 0;
4263 int nonstatic_word_space_offset = 0;
4264 int nonstatic_short_space_offset = 0;
4265 int nonstatic_byte_space_offset = 0;
4266
4267 // Try to squeeze some of the fields into the gaps due to
4268 // long/double alignment.
4269 if (nonstatic_double_count > 0) {
4270 int offset = next_nonstatic_double_offset;
4271 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
4272 if (compact_fields && offset != next_nonstatic_double_offset) {
4273 // Allocate available fields into the gap before double field.
4274 int length = next_nonstatic_double_offset - offset;
4275 assert(length == BytesPerInt, "");
4276 nonstatic_word_space_offset = offset;
4277 if (nonstatic_word_count > 0) {
4278 nonstatic_word_count -= 1;
4279 nonstatic_word_space_count = 1; // Only one will fit
4280 length -= BytesPerInt;
4281 offset += BytesPerInt;
4282 }
4283 nonstatic_short_space_offset = offset;
4284 while (length >= BytesPerShort && nonstatic_short_count > 0) {
4285 nonstatic_short_count -= 1;
4286 nonstatic_short_space_count += 1;
4287 length -= BytesPerShort;
4288 offset += BytesPerShort;
4289 }
4290 nonstatic_byte_space_offset = offset;
4291 while (length > 0 && nonstatic_byte_count > 0) {
4292 nonstatic_byte_count -= 1;
4293 nonstatic_byte_space_count += 1;
4294 length -= 1;
4295 }
4296 // Allocate oop field in the gap if there are no other fields for that.
4297 nonstatic_oop_space_offset = offset;
4298 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
4299 allocation_style != 0) { // when oop fields not first
4300 nonstatic_oop_count -= 1;
4301 nonstatic_oop_space_count = 1; // Only one will fit
4302 length -= heapOopSize;
4303 offset += heapOopSize;
4304 }
4305 }
4306 }
4307
4308 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4309 (nonstatic_double_count * BytesPerLong);
4310 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4311 (nonstatic_word_count * BytesPerInt);
4312 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4313 (nonstatic_short_count * BytesPerShort);
4314 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4315 nonstatic_byte_count;
4316
4317 // let oops jump before padding with this allocation style
4318 if( allocation_style == 1 ) {
4319 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4320 if( nonstatic_oop_count > 0 ) {
4321 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4322 }
4323 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4324 }
4325
4326 // Aligning embedded value types
4327 // bug below, the current algorithm to layout embedded value types always put them at the
4328 // end of the layout, which doesn't match the different allocation policies the VM is
4329 // supposed to provide => FixMe
4330 // Note also that the current alignment policy is to make each value type starting on a
4331 // 64 bits boundary. This could be optimized later. For instance, it could be nice to
4332 // align value types according to their most constrained internal type.
4333 next_nonstatic_valuetype_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4334 int next_value_type_index = 0;
4335
4336 // Iterate over fields again and compute correct offsets.
4337 // The field allocation type was temporarily stored in the offset slot.
4338 // oop fields are located before non-oop fields (static and non-static).
4339 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4340
4341 // skip already laid out fields
4342 if (fs.is_offset_set()) continue;
4343
4344 // contended instance fields are handled below
4345 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4346
4347 int real_offset = 0;
4348 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4349
4350 // pack the rest of the fields
4351 switch (atype) {
4352 // Value types in static fields are handled with oops
4353 case STATIC_FLATTENABLE: // Fallthrough
4354 case STATIC_OOP:
4355 real_offset = next_static_oop_offset;
4356 next_static_oop_offset += heapOopSize;
4357 break;
4358 case STATIC_BYTE:
4359 real_offset = next_static_byte_offset;
4360 next_static_byte_offset += 1;
4361 break;
4362 case STATIC_SHORT:
4363 real_offset = next_static_short_offset;
4364 next_static_short_offset += BytesPerShort;
4365 break;
4366 case STATIC_WORD:
4367 real_offset = next_static_word_offset;
4368 next_static_word_offset += BytesPerInt;
4369 break;
4370 case STATIC_DOUBLE:
4371 real_offset = next_static_double_offset;
4372 next_static_double_offset += BytesPerLong;
4373 break;
4374 case NONSTATIC_FLATTENABLE:
4375 if (fs.is_flattened()) {
4376 Klass* klass = nonstatic_value_type_klasses[next_value_type_index];
4377 assert(klass != NULL, "Klass should have been loaded and resolved earlier");
4378 assert(klass->access_flags().is_value_type(),"Must be a value type");
4379 ValueKlass* vklass = ValueKlass::cast(klass);
4380 real_offset = next_nonstatic_valuetype_offset;
4381 next_nonstatic_valuetype_offset += (vklass->size_helper()) * wordSize - vklass->first_field_offset();
4382 // aligning next value type on a 64 bits boundary
4383 next_nonstatic_valuetype_offset = align_up(next_nonstatic_valuetype_offset, BytesPerLong);
4384 next_value_type_index += 1;
4385
4386 if (vklass->contains_oops()) { // add flatten oop maps
4387 int diff = real_offset - vklass->first_field_offset();
4388 const OopMapBlock* map = vklass->start_of_nonstatic_oop_maps();
4389 const OopMapBlock* const last_map = map + vklass->nonstatic_oop_map_count();
4390 while (map < last_map) {
4391 nonstatic_oop_maps->add(map->offset() + diff, map->count());
4392 map++;
4393 }
4394 }
4395 break;
4396 } else {
4397 // Fall through
4398 }
4399 case NONSTATIC_OOP:
4400 if( nonstatic_oop_space_count > 0 ) {
4401 real_offset = nonstatic_oop_space_offset;
4402 nonstatic_oop_space_offset += heapOopSize;
4403 nonstatic_oop_space_count -= 1;
4404 } else {
4405 real_offset = next_nonstatic_oop_offset;
4406 next_nonstatic_oop_offset += heapOopSize;
4407 }
4408 nonstatic_oop_maps->add(real_offset, 1);
4409 break;
4410 case NONSTATIC_BYTE:
4411 if( nonstatic_byte_space_count > 0 ) {
4412 real_offset = nonstatic_byte_space_offset;
4413 nonstatic_byte_space_offset += 1;
4414 nonstatic_byte_space_count -= 1;
4415 } else {
4416 real_offset = next_nonstatic_byte_offset;
4417 next_nonstatic_byte_offset += 1;
4418 }
4419 break;
4420 case NONSTATIC_SHORT:
4421 if( nonstatic_short_space_count > 0 ) {
4422 real_offset = nonstatic_short_space_offset;
4423 nonstatic_short_space_offset += BytesPerShort;
4424 nonstatic_short_space_count -= 1;
4425 } else {
4426 real_offset = next_nonstatic_short_offset;
4427 next_nonstatic_short_offset += BytesPerShort;
4428 }
4429 break;
4430 case NONSTATIC_WORD:
4431 if( nonstatic_word_space_count > 0 ) {
4432 real_offset = nonstatic_word_space_offset;
4433 nonstatic_word_space_offset += BytesPerInt;
4434 nonstatic_word_space_count -= 1;
4435 } else {
4436 real_offset = next_nonstatic_word_offset;
4437 next_nonstatic_word_offset += BytesPerInt;
4438 }
4439 break;
4440 case NONSTATIC_DOUBLE:
4441 real_offset = next_nonstatic_double_offset;
4442 next_nonstatic_double_offset += BytesPerLong;
4443 break;
4444 default:
4445 ShouldNotReachHere();
4446 }
4447 fs.set_offset(real_offset);
4448 }
4449
4450
4451 // Handle the contended cases.
4452 //
4453 // Each contended field should not intersect the cache line with another contended field.
4454 // In the absence of alignment information, we end up with pessimistically separating
4455 // the fields with full-width padding.
4456 //
4457 // Additionally, this should not break alignment for the fields, so we round the alignment up
4458 // for each field.
4459 if (nonstatic_contended_count > 0) {
4460
4461 // if there is at least one contended field, we need to have pre-padding for them
4462 next_nonstatic_padded_offset += ContendedPaddingWidth;
4463
4464 // collect all contended groups
4465 ResourceBitMap bm(cp->size());
4466 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4467 // skip already laid out fields
4468 if (fs.is_offset_set()) continue;
4469
4470 if (fs.is_contended()) {
4471 bm.set_bit(fs.contended_group());
4472 }
4473 }
4474
4475 int current_group = -1;
4476 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4477
4478 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4479
4480 // skip already laid out fields
4481 if (fs.is_offset_set()) continue;
4482
4483 // skip non-contended fields and fields from different group
4484 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4485
4486 // handle statics below
4487 if (fs.access_flags().is_static()) continue;
4488
4489 int real_offset = 0;
4490 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4491
4492 switch (atype) {
4493 case NONSTATIC_BYTE:
4494 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4495 real_offset = next_nonstatic_padded_offset;
4496 next_nonstatic_padded_offset += 1;
4497 break;
4498
4499 case NONSTATIC_SHORT:
4500 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4501 real_offset = next_nonstatic_padded_offset;
4502 next_nonstatic_padded_offset += BytesPerShort;
4503 break;
4504
4505 case NONSTATIC_WORD:
4506 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4507 real_offset = next_nonstatic_padded_offset;
4508 next_nonstatic_padded_offset += BytesPerInt;
4509 break;
4510
4511 case NONSTATIC_DOUBLE:
4512 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4513 real_offset = next_nonstatic_padded_offset;
4514 next_nonstatic_padded_offset += BytesPerLong;
4515 break;
4516
4517 // Value types in static fields are handled with oops
4518 case NONSTATIC_FLATTENABLE:
4519 throwValueTypeLimitation(THREAD_AND_LOCATION,
4520 "@Contended annotation not supported for value types yet", fs.name(), fs.signature());
4521 return;
4522
4523 case NONSTATIC_OOP:
4524 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4525 real_offset = next_nonstatic_padded_offset;
4526 next_nonstatic_padded_offset += heapOopSize;
4527 nonstatic_oop_maps->add(real_offset, 1);
4528 break;
4529
4530 default:
4531 ShouldNotReachHere();
4532 }
4533
4534 if (fs.contended_group() == 0) {
4535 // Contended group defines the equivalence class over the fields:
4536 // the fields within the same contended group are not inter-padded.
4537 // The only exception is default group, which does not incur the
4538 // equivalence, and so requires intra-padding.
4539 next_nonstatic_padded_offset += ContendedPaddingWidth;
4540 }
4541
4542 fs.set_offset(real_offset);
4543 } // for
4544
4545 // Start laying out the next group.
4546 // Note that this will effectively pad the last group in the back;
4547 // this is expected to alleviate memory contention effects for
4548 // subclass fields and/or adjacent object.
4549 // If this was the default group, the padding is already in place.
4550 if (current_group != 0) {
4551 next_nonstatic_padded_offset += ContendedPaddingWidth;
4552 }
4553 }
4554
4555 // handle static fields
4556 }
4557
4558 // Entire class is contended, pad in the back.
4559 // This helps to alleviate memory contention effects for subclass fields
4560 // and/or adjacent object.
4561 if (is_contended_class) {
4562 assert(!is_value_type(), "@Contended not supported for value types yet");
4563 next_nonstatic_padded_offset += ContendedPaddingWidth;
4564 }
4565
4566 int notaligned_nonstatic_fields_end;
4567 if (nonstatic_value_type_count != 0) {
4568 notaligned_nonstatic_fields_end = next_nonstatic_valuetype_offset;
4569 } else {
4570 notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4571 }
4572
4573 int nonstatic_field_sz_align = heapOopSize;
4574 if (is_value_type()) {
4575 if ((notaligned_nonstatic_fields_end - nonstatic_fields_start) > heapOopSize) {
4576 nonstatic_field_sz_align = BytesPerLong; // value copy of fields only uses jlong copy
4577 }
4578 }
4579 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, nonstatic_field_sz_align);
4580 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4581 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4582
4583 int static_field_size = (static_fields_end -
4584 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4585 nonstatic_field_size = nonstatic_field_size +
4586 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4587
4588 int instance_size = align_object_size(instance_end / wordSize);
4589
4590 assert(instance_size == align_object_size(align_up(
4591 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize)
4592 + initial_value_type_padding, wordSize) / wordSize), "consistent layout helper value");
4593
4594
4595 // Invariant: nonstatic_field end/start should only change if there are
4596 // nonstatic fields in the class, or if the class is contended. We compare
4597 // against the non-aligned value, so that end alignment will not fail the
4598 // assert without actually having the fields.
4599 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4600 is_contended_class ||
4601 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4602
4603 // Number of non-static oop map blocks allocated at end of klass.
4604 nonstatic_oop_maps->compact(THREAD);
4605
4606 #ifndef PRODUCT
4607 if ((PrintFieldLayout && !is_value_type()) ||
4608 (PrintValueLayout && (is_value_type() || has_nonstatic_value_fields))) {
4609 print_field_layout(_class_name,
4610 _fields,
4611 cp,
4612 instance_size,
4613 nonstatic_fields_start,
4614 nonstatic_fields_end,
4615 static_fields_end);
4616 nonstatic_oop_maps->print_on(tty);
4617 tty->print("\n");
4618 }
4619
4620 #endif
4621 // Pass back information needed for InstanceKlass creation
4622 info->oop_map_blocks = nonstatic_oop_maps;
4623 info->instance_size = instance_size;
4624 info->static_field_size = static_field_size;
4625 info->nonstatic_field_size = nonstatic_field_size;
4626 info->has_nonstatic_fields = has_nonstatic_fields;
4627 }
4628
4629 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik, TRAPS) {
4630 assert(ik != NULL, "invariant");
4631
4632 const Klass* const super = ik->super();
4633
4634 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4635 // in which case we don't have to register objects as finalizable
4636 if (!_has_empty_finalizer) {
4637 if (_has_finalizer ||
4638 (super != NULL && super->has_finalizer())) {
4639 ik->set_has_finalizer();
4640 }
4641 }
4642
4643 #ifdef ASSERT
4644 bool f = false;
4645 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4646 vmSymbols::void_method_signature());
4647 if (m != NULL && !m->is_empty_method()) {
4648 f = true;
4649 }
4650
4651 // Spec doesn't prevent agent from redefinition of empty finalizer.
4652 // Despite the fact that it's generally bad idea and redefined finalizer
4653 // will not work as expected we shouldn't abort vm in this case
4654 if (!ik->has_redefined_this_or_super()) {
4655 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4656 }
4657 #endif
4658
4659 // Check if this klass supports the java.lang.Cloneable interface
4660 if (SystemDictionary::Cloneable_klass_loaded()) {
4661 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4662 if (ik->is_value()) {
4663 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support Cloneable");
4664 return;
4665 }
4666 ik->set_is_cloneable();
4667 }
4668 }
4669
4670 // Check if this klass has a vanilla default constructor
4671 if (super == NULL) {
4672 // java.lang.Object has empty default constructor
4673 ik->set_has_vanilla_constructor();
4674 } else {
4675 if (super->has_vanilla_constructor() &&
4676 _has_vanilla_constructor) {
4677 ik->set_has_vanilla_constructor();
4678 }
4679 #ifdef ASSERT
4680 bool v = false;
4681 if (super->has_vanilla_constructor()) {
4682 const Method* const constructor =
4683 ik->find_method(vmSymbols::object_initializer_name(),
4684 vmSymbols::void_method_signature());
4685 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4686 v = true;
4687 }
4688 }
4689 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4690 #endif
4691 }
4692
4693 // If it cannot be fast-path allocated, set a bit in the layout helper.
4694 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4695 assert(ik->size_helper() > 0, "layout_helper is initialized");
4696 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4697 || ik->is_abstract() || ik->is_interface()
4698 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4699 || ik->size_helper() >= FastAllocateSizeLimit) {
4700 // Forbid fast-path allocation.
4701 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4702 ik->set_layout_helper(lh);
4703 }
4704 }
4705
4706 bool ClassFileParser::supports_value_types() const {
4707 // Value types are only supported by class file version 55 and later
4708 return _major_version >= JAVA_11_VERSION;
4709 }
4710
4711 // utility methods for appending an array with check for duplicates
4712
4713 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4714 const Array<InstanceKlass*>* const ifs) {
4715 // iterate over new interfaces
4716 for (int i = 0; i < ifs->length(); i++) {
4717 InstanceKlass* const e = ifs->at(i);
4718 assert(e->is_klass() && e->is_interface(), "just checking");
4719 // add new interface
4720 result->append_if_missing(e);
4721 }
4722 }
4723
4724 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4725 Array<InstanceKlass*>* local_ifs,
4726 ClassLoaderData* loader_data,
4727 TRAPS) {
4728 assert(local_ifs != NULL, "invariant");
4729 assert(loader_data != NULL, "invariant");
4730
4731 // Compute maximum size for transitive interfaces
4732 int max_transitive_size = 0;
4733 int super_size = 0;
4734 // Add superclass transitive interfaces size
4735 if (super != NULL) {
4736 super_size = super->transitive_interfaces()->length();
4737 max_transitive_size += super_size;
4738 }
4739 // Add local interfaces' super interfaces
4740 const int local_size = local_ifs->length();
4741 for (int i = 0; i < local_size; i++) {
4742 InstanceKlass* const l = local_ifs->at(i);
4743 max_transitive_size += l->transitive_interfaces()->length();
4744 }
4745 // Finally add local interfaces
4746 max_transitive_size += local_size;
4747 // Construct array
4748 if (max_transitive_size == 0) {
4749 // no interfaces, use canonicalized array
4750 return Universe::the_empty_instance_klass_array();
4751 } else if (max_transitive_size == super_size) {
4752 // no new local interfaces added, share superklass' transitive interface array
4753 return super->transitive_interfaces();
4754 } else if (max_transitive_size == local_size) {
4755 // only local interfaces added, share local interface array
4756 return local_ifs;
4757 } else {
4758 ResourceMark rm;
4759 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4760
4761 // Copy down from superclass
4762 if (super != NULL) {
4763 append_interfaces(result, super->transitive_interfaces());
4764 }
4765
4766 // Copy down from local interfaces' superinterfaces
4767 for (int i = 0; i < local_size; i++) {
4768 InstanceKlass* const l = local_ifs->at(i);
4769 append_interfaces(result, l->transitive_interfaces());
4770 }
4771 // Finally add local interfaces
4772 append_interfaces(result, local_ifs);
4773
4774 // length will be less than the max_transitive_size if duplicates were removed
4775 const int length = result->length();
4776 assert(length <= max_transitive_size, "just checking");
4777 Array<InstanceKlass*>* const new_result =
4778 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4779 for (int i = 0; i < length; i++) {
4780 InstanceKlass* const e = result->at(i);
4781 assert(e != NULL, "just checking");
4782 new_result->at_put(i, e);
4783 }
4784 return new_result;
4785 }
4786 }
4787
4788 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4789 assert(this_klass != NULL, "invariant");
4790 const Klass* const super = this_klass->super();
4791 if (super != NULL) {
4792
4793 // If the loader is not the boot loader then throw an exception if its
4794 // superclass is in package jdk.internal.reflect and its loader is not a
4795 // special reflection class loader
4796 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4797 assert(super->is_instance_klass(), "super is not instance klass");
4798 PackageEntry* super_package = super->package();
4799 if (super_package != NULL &&
4800 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4801 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4802 ResourceMark rm(THREAD);
4803 Exceptions::fthrow(
4804 THREAD_AND_LOCATION,
4805 vmSymbols::java_lang_IllegalAccessError(),
4806 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4807 this_klass->external_name(),
4808 this_klass->class_loader_data()->loader_name_and_id(),
4809 super->external_name());
4810 return;
4811 }
4812 }
4813
4814 Reflection::VerifyClassAccessResults vca_result =
4815 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4816 if (vca_result != Reflection::ACCESS_OK) {
4817 ResourceMark rm(THREAD);
4818 char* msg = Reflection::verify_class_access_msg(this_klass,
4819 InstanceKlass::cast(super),
4820 vca_result);
4821 if (msg == NULL) {
4822 bool same_module = (this_klass->module() == super->module());
4823 Exceptions::fthrow(
4824 THREAD_AND_LOCATION,
4825 vmSymbols::java_lang_IllegalAccessError(),
4826 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4827 this_klass->external_name(),
4828 super->is_abstract() ? "abstract " : "",
4829 super->external_name(),
4830 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4831 (same_module) ? "" : "; ",
4832 (same_module) ? "" : super->class_in_module_of_loader());
4833 } else {
4834 // Add additional message content.
4835 Exceptions::fthrow(
4836 THREAD_AND_LOCATION,
4837 vmSymbols::java_lang_IllegalAccessError(),
4838 "superclass access check failed: %s",
4839 msg);
4840 }
4841 }
4842 }
4843 }
4844
4845
4846 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4847 assert(this_klass != NULL, "invariant");
4848 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4849 const int lng = local_interfaces->length();
4850 for (int i = lng - 1; i >= 0; i--) {
4851 InstanceKlass* const k = local_interfaces->at(i);
4852 assert (k != NULL && k->is_interface(), "invalid interface");
4853 Reflection::VerifyClassAccessResults vca_result =
4854 Reflection::verify_class_access(this_klass, k, false);
4855 if (vca_result != Reflection::ACCESS_OK) {
4856 ResourceMark rm(THREAD);
4857 char* msg = Reflection::verify_class_access_msg(this_klass,
4858 k,
4859 vca_result);
4860 if (msg == NULL) {
4861 bool same_module = (this_klass->module() == k->module());
4862 Exceptions::fthrow(
4863 THREAD_AND_LOCATION,
4864 vmSymbols::java_lang_IllegalAccessError(),
4865 "class %s cannot access its superinterface %s (%s%s%s)",
4866 this_klass->external_name(),
4867 k->external_name(),
4868 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4869 (same_module) ? "" : "; ",
4870 (same_module) ? "" : k->class_in_module_of_loader());
4871 } else {
4872 // Add additional message content.
4873 Exceptions::fthrow(
4874 THREAD_AND_LOCATION,
4875 vmSymbols::java_lang_IllegalAccessError(),
4876 "superinterface check failed: %s",
4877 msg);
4878 }
4879 }
4880 }
4881 }
4882
4883
4884 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4885 assert(this_klass != NULL, "invariant");
4886 const Array<Method*>* const methods = this_klass->methods();
4887 const int num_methods = methods->length();
4888
4889 // go thru each method and check if it overrides a final method
4890 for (int index = 0; index < num_methods; index++) {
4891 const Method* const m = methods->at(index);
4892
4893 // skip private, static, and <init> methods
4894 if ((!m->is_private() && !m->is_static()) &&
4895 (m->name() != vmSymbols::object_initializer_name())) {
4896
4897 const Symbol* const name = m->name();
4898 const Symbol* const signature = m->signature();
4899 const Klass* k = this_klass->super();
4900 const Method* super_m = NULL;
4901 while (k != NULL) {
4902 // skip supers that don't have final methods.
4903 if (k->has_final_method()) {
4904 // lookup a matching method in the super class hierarchy
4905 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4906 if (super_m == NULL) {
4907 break; // didn't find any match; get out
4908 }
4909
4910 if (super_m->is_final() && !super_m->is_static() &&
4911 !super_m->access_flags().is_private()) {
4912 // matching method in super is final, and not static or private
4913 bool can_access = Reflection::verify_member_access(this_klass,
4914 super_m->method_holder(),
4915 super_m->method_holder(),
4916 super_m->access_flags(),
4917 false, false, CHECK);
4918 if (can_access) {
4919 // this class can access super final method and therefore override
4920 ResourceMark rm(THREAD);
4921 Exceptions::fthrow(THREAD_AND_LOCATION,
4922 vmSymbols::java_lang_VerifyError(),
4923 "class %s overrides final method %s.%s%s",
4924 this_klass->external_name(),
4925 super_m->method_holder()->external_name(),
4926 name->as_C_string(),
4927 signature->as_C_string()
4928 );
4929 return;
4930 }
4931 }
4932
4933 // continue to look from super_m's holder's super.
4934 k = super_m->method_holder()->super();
4935 continue;
4936 }
4937
4938 k = k->super();
4939 }
4940 }
4941 }
4942 }
4943
4944
4945 // assumes that this_klass is an interface
4946 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4947 assert(this_klass != NULL, "invariant");
4948 assert(this_klass->is_interface(), "not an interface");
4949 const Array<Method*>* methods = this_klass->methods();
4950 const int num_methods = methods->length();
4951
4952 for (int index = 0; index < num_methods; index++) {
4953 const Method* const m = methods->at(index);
4954 // if m is static and not the init method, throw a verify error
4955 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4956 ResourceMark rm(THREAD);
4957 Exceptions::fthrow(
4958 THREAD_AND_LOCATION,
4959 vmSymbols::java_lang_VerifyError(),
4960 "Illegal static method %s in interface %s",
4961 m->name()->as_C_string(),
4962 this_klass->external_name()
4963 );
4964 return;
4965 }
4966 }
4967 }
4968
4969 // utility methods for format checking
4970
4971 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4972 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4973 const bool is_value_type = (flags & JVM_ACC_VALUE) != 0;
4974 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4975 assert(supports_value_types() || !is_value_type, "JVM_ACC_VALUE should not be set");
4976 if (is_module) {
4977 ResourceMark rm(THREAD);
4978 Exceptions::fthrow(
4979 THREAD_AND_LOCATION,
4980 vmSymbols::java_lang_NoClassDefFoundError(),
4981 "%s is not a class because access_flag ACC_MODULE is set",
4982 _class_name->as_C_string());
4983 return;
4984 }
4985
4986 if (is_value_type && !EnableValhalla) {
4987 ResourceMark rm(THREAD);
4988 Exceptions::fthrow(
4989 THREAD_AND_LOCATION,
4990 vmSymbols::java_lang_ClassFormatError(),
4991 "Class modifier ACC_VALUE in class %s requires option -XX:+EnableValhalla",
4992 _class_name->as_C_string()
4993 );
4994 }
4995
4996 if (!_need_verify) { return; }
4997
4998 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4999 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5000 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5001 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
5002 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5003 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
5004 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5005
5006 if ((is_abstract && is_final) ||
5007 (is_interface && !is_abstract) ||
5008 (is_interface && major_gte_15 && (is_super || is_enum)) ||
5009 (!is_interface && major_gte_15 && is_annotation) ||
5010 (is_value_type && (is_interface || is_abstract || is_enum || !is_final))) {
5011 ResourceMark rm(THREAD);
5012 Exceptions::fthrow(
5013 THREAD_AND_LOCATION,
5014 vmSymbols::java_lang_ClassFormatError(),
5015 "Illegal class modifiers in class %s: 0x%X",
5016 _class_name->as_C_string(), flags
5017 );
5018 return;
5019 }
5020 }
5021
5022 static bool has_illegal_visibility(jint flags) {
5023 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5024 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5025 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5026
5027 return ((is_public && is_protected) ||
5028 (is_public && is_private) ||
5029 (is_protected && is_private));
5030 }
5031
5032 // A legal major_version.minor_version must be one of the following:
5033 //
5034 // Major_version = 45, any minor_version.
5035 // Major_version >= 46 and major_version <= current_major_version and minor_version = 0.
5036 // Major_version = current_major_version and minor_version = 65535 and --enable-preview is present.
5037 //
5038 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
5039 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
5040 if (major != JAVA_MIN_SUPPORTED_VERSION) { // All 45.* are ok including 45.65535
5041 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
5042 if (major != max_version) {
5043 ResourceMark rm(THREAD);
5044 Exceptions::fthrow(
5045 THREAD_AND_LOCATION,
5046 vmSymbols::java_lang_UnsupportedClassVersionError(),
5047 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
5048 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
5049 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
5050 return;
5051 }
5052
5053 if (!Arguments::enable_preview()) {
5054 ResourceMark rm(THREAD);
5055 Exceptions::fthrow(
5056 THREAD_AND_LOCATION,
5057 vmSymbols::java_lang_UnsupportedClassVersionError(),
5058 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
5059 class_name->as_C_string(), major, minor);
5060 return;
5061 }
5062
5063 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
5064 if (major > max_version) {
5065 ResourceMark rm(THREAD);
5066 Exceptions::fthrow(
5067 THREAD_AND_LOCATION,
5068 vmSymbols::java_lang_UnsupportedClassVersionError(),
5069 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5070 "this version of the Java Runtime only recognizes class file versions up to %u.0",
5071 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
5072 } else if (major < JAVA_MIN_SUPPORTED_VERSION) {
5073 ResourceMark rm(THREAD);
5074 Exceptions::fthrow(
5075 THREAD_AND_LOCATION,
5076 vmSymbols::java_lang_UnsupportedClassVersionError(),
5077 "%s (class file version %u.%u) was compiled with an invalid major version",
5078 class_name->as_C_string(), major, minor);
5079 } else if (minor != 0) {
5080 ResourceMark rm(THREAD);
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 }
5090
5091 void ClassFileParser::verify_legal_field_modifiers(jint flags,
5092 bool is_interface,
5093 bool is_value_type,
5094 TRAPS) const {
5095 if (!_need_verify) { return; }
5096
5097 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5098 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5099 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5100 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5101 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5102 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
5103 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
5104 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5105 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5106
5107 bool is_illegal = false;
5108
5109 if (is_interface) {
5110 if (!is_public || !is_static || !is_final || is_private ||
5111 is_protected || is_volatile || is_transient ||
5112 (major_gte_15 && is_enum)) {
5113 is_illegal = true;
5114 }
5115 } else { // not interface
5116 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
5117 is_illegal = true;
5118 } else {
5119 if (is_value_type && !is_static && !is_final) {
5120 is_illegal = true;
5121 }
5122 }
5123 }
5124
5125 if (is_illegal) {
5126 ResourceMark rm(THREAD);
5127 Exceptions::fthrow(
5128 THREAD_AND_LOCATION,
5129 vmSymbols::java_lang_ClassFormatError(),
5130 "Illegal field modifiers in class %s: 0x%X",
5131 _class_name->as_C_string(), flags);
5132 return;
5133 }
5134 }
5135
5136 void ClassFileParser::verify_legal_method_modifiers(jint flags,
5137 bool is_interface,
5138 bool is_value_type,
5139 const Symbol* name,
5140 TRAPS) const {
5141 if (!_need_verify) { return; }
5142
5143 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5144 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5145 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5146 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5147 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
5148 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5149 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
5150 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
5151 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
5152 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5153 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5154 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
5155 const bool is_initializer = (name == vmSymbols::object_initializer_name());
5156
5157 bool is_illegal = false;
5158
5159 if (is_interface) {
5160 if (major_gte_8) {
5161 // Class file version is JAVA_8_VERSION or later Methods of
5162 // interfaces may set any of the flags except ACC_PROTECTED,
5163 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5164 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5165 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5166 (is_native || is_protected || is_final || is_synchronized) ||
5167 // If a specific method of a class or interface has its
5168 // ACC_ABSTRACT flag set, it must not have any of its
5169 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5170 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
5171 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5172 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5173 (is_abstract && (is_private || is_static || is_strict))) {
5174 is_illegal = true;
5175 }
5176 } else if (major_gte_15) {
5177 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5178 if (!is_public || is_private || is_protected || is_static || is_final ||
5179 is_synchronized || is_native || !is_abstract || is_strict) {
5180 is_illegal = true;
5181 }
5182 } else {
5183 // Class file version is pre-JAVA_1_5_VERSION
5184 if (!is_public || is_static || is_final || is_native || !is_abstract) {
5185 is_illegal = true;
5186 }
5187 }
5188 } else { // not interface
5189 if (has_illegal_visibility(flags)) {
5190 is_illegal = true;
5191 } else {
5192 if (is_initializer) {
5193 if (is_static || is_final || is_synchronized || is_native ||
5194 is_abstract || (major_gte_15 && is_bridge)) {
5195 is_illegal = true;
5196 }
5197 } else { // not initializer
5198 if (is_value_type && is_synchronized && !is_static) {
5199 is_illegal = true;
5200 } else {
5201 if (is_abstract) {
5202 if ((is_final || is_native || is_private || is_static ||
5203 (major_gte_15 && (is_synchronized || is_strict)))) {
5204 is_illegal = true;
5205 }
5206 }
5207 }
5208 }
5209 }
5210 }
5211
5212 if (is_illegal) {
5213 ResourceMark rm(THREAD);
5214 Exceptions::fthrow(
5215 THREAD_AND_LOCATION,
5216 vmSymbols::java_lang_ClassFormatError(),
5217 "Method %s in class %s has illegal modifiers: 0x%X",
5218 name->as_C_string(), _class_name->as_C_string(), flags);
5219 return;
5220 }
5221 }
5222
5223 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5224 int length,
5225 TRAPS) const {
5226 assert(_need_verify, "only called when _need_verify is true");
5227 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5228 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5229 }
5230 }
5231
5232 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5233 // In class names, '/' separates unqualified names. This is verified in this function also.
5234 // Method names also may not contain the characters '<' or '>', unless <init>
5235 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5236 // method. Because these names have been checked as special cases before
5237 // calling this method in verify_legal_method_name.
5238 //
5239 // This method is also called from the modular system APIs in modules.cpp
5240 // to verify the validity of module and package names.
5241 bool ClassFileParser::verify_unqualified_name(const char* name,
5242 unsigned int length,
5243 int type) {
5244 for (const char* p = name; p != name + length; p++) {
5245 switch(*p) {
5246 case '.':
5247 case ';':
5248 case '[':
5249 // do not permit '.', ';', or '['
5250 return false;
5251 case '/':
5252 // check for '//' or leading or trailing '/' which are not legal
5253 // unqualified name must not be empty
5254 if (type == ClassFileParser::LegalClass) {
5255 if (p == name || p+1 >= name+length || *(p+1) == '/') {
5256 return false;
5257 }
5258 } else {
5259 return false; // do not permit '/' unless it's class name
5260 }
5261 break;
5262 case '<':
5263 case '>':
5264 // do not permit '<' or '>' in method names
5265 if (type == ClassFileParser::LegalMethod) {
5266 return false;
5267 }
5268 }
5269 }
5270 return true;
5271 }
5272
5273 // Take pointer to a UTF8 byte string (not NUL-terminated).
5274 // Skip over the longest part of the string that could
5275 // be taken as a fieldname. Allow '/' if slash_ok is true.
5276 // Return a pointer to just past the fieldname.
5277 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5278 // being true, we saw consecutive slashes (meaning we were looking for a
5279 // qualified path but found something that was badly-formed).
5280 static const char* skip_over_field_name(const char* const name,
5281 bool slash_ok,
5282 unsigned int length) {
5283 const char* p;
5284 jboolean last_is_slash = false;
5285 jboolean not_first_ch = false;
5286
5287 for (p = name; p != name + length; not_first_ch = true) {
5288 const char* old_p = p;
5289 jchar ch = *p;
5290 if (ch < 128) {
5291 p++;
5292 // quick check for ascii
5293 if ((ch >= 'a' && ch <= 'z') ||
5294 (ch >= 'A' && ch <= 'Z') ||
5295 (ch == '_' || ch == '$') ||
5296 (not_first_ch && ch >= '0' && ch <= '9')) {
5297 last_is_slash = false;
5298 continue;
5299 }
5300 if (slash_ok && ch == '/') {
5301 if (last_is_slash) {
5302 return NULL; // Don't permit consecutive slashes
5303 }
5304 last_is_slash = true;
5305 continue;
5306 }
5307 }
5308 else {
5309 jint unicode_ch;
5310 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5311 p = tmp_p;
5312 last_is_slash = false;
5313 // Check if ch is Java identifier start or is Java identifier part
5314 // 4672820: call java.lang.Character methods directly without generating separate tables.
5315 EXCEPTION_MARK;
5316 // return value
5317 JavaValue result(T_BOOLEAN);
5318 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
5319 JavaCallArguments args;
5320 args.push_int(unicode_ch);
5321
5322 if (not_first_ch) {
5323 // public static boolean isJavaIdentifierPart(char ch);
5324 JavaCalls::call_static(&result,
5325 SystemDictionary::Character_klass(),
5326 vmSymbols::isJavaIdentifierPart_name(),
5327 vmSymbols::int_bool_signature(),
5328 &args,
5329 THREAD);
5330 } else {
5331 // public static boolean isJavaIdentifierStart(char ch);
5332 JavaCalls::call_static(&result,
5333 SystemDictionary::Character_klass(),
5334 vmSymbols::isJavaIdentifierStart_name(),
5335 vmSymbols::int_bool_signature(),
5336 &args,
5337 THREAD);
5338 }
5339 if (HAS_PENDING_EXCEPTION) {
5340 CLEAR_PENDING_EXCEPTION;
5341 return NULL;
5342 }
5343 if(result.get_jboolean()) {
5344 continue;
5345 }
5346 }
5347 return (not_first_ch) ? old_p : NULL;
5348 }
5349 return (not_first_ch) ? p : NULL;
5350 }
5351
5352 // Take pointer to a UTF8 byte string (not NUL-terminated).
5353 // Skip over the longest part of the string that could
5354 // be taken as a field signature. Allow "void" if void_ok.
5355 // Return a pointer to just past the signature.
5356 // Return NULL if no legal signature is found.
5357 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5358 bool void_ok,
5359 unsigned int length,
5360 TRAPS) const {
5361 unsigned int array_dim = 0;
5362 while (length > 0) {
5363 switch (signature[0]) {
5364 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5365 case JVM_SIGNATURE_BOOLEAN:
5366 case JVM_SIGNATURE_BYTE:
5367 case JVM_SIGNATURE_CHAR:
5368 case JVM_SIGNATURE_SHORT:
5369 case JVM_SIGNATURE_INT:
5370 case JVM_SIGNATURE_FLOAT:
5371 case JVM_SIGNATURE_LONG:
5372 case JVM_SIGNATURE_DOUBLE:
5373 return signature + 1;
5374 case JVM_SIGNATURE_VALUETYPE:
5375 // Can't enable this check until JDK upgrades the bytecode generators
5376 // if (_major_version < CONSTANT_CLASS_DESCRIPTORS ) {
5377 // classfile_parse_error("Class name contains illegal Q-signature "
5378 // "in descriptor in class file %s",
5379 // CHECK_0);
5380 // }
5381 // fall through
5382 case JVM_SIGNATURE_CLASS:
5383 {
5384 if (_major_version < JAVA_1_5_VERSION) {
5385 // Skip over the class name if one is there
5386 const char* const p = skip_over_field_name(signature + 1, true, --length);
5387
5388 // The next character better be a semicolon
5389 if (p && (p - signature) > 1 && p[0] == ';') {
5390 return p + 1;
5391 }
5392 }
5393 else {
5394 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
5395 signature++;
5396 const char* c = (const char*) memchr(signature, ';', length - 1);
5397 // Format check signature
5398 if (c != NULL) {
5399 int newlen = c - (char*) signature;
5400 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5401 if (!legal) {
5402 classfile_parse_error("Class name contains illegal character "
5403 "in descriptor in class file %s",
5404 CHECK_0);
5405 return NULL;
5406 }
5407 return signature + newlen + 1;
5408 }
5409 }
5410 return NULL;
5411 }
5412 case JVM_SIGNATURE_ARRAY:
5413 array_dim++;
5414 if (array_dim > 255) {
5415 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5416 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5417 }
5418 // The rest of what's there better be a legal signature
5419 signature++;
5420 length--;
5421 void_ok = false;
5422 break;
5423 default:
5424 return NULL;
5425 }
5426 }
5427 return NULL;
5428 }
5429
5430 // Checks if name is a legal class name.
5431 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5432 if (!_need_verify || _relax_verify) { return; }
5433
5434 assert(name->refcount() > 0, "symbol must be kept alive");
5435 char* bytes = (char*)name->bytes();
5436 unsigned int length = name->utf8_length();
5437 bool legal = false;
5438
5439 if (length > 0) {
5440 const char* p;
5441 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5442 p = skip_over_field_signature(bytes, false, length, CHECK);
5443 legal = (p != NULL) && ((p - bytes) == (int)length);
5444 } else if (_major_version < JAVA_1_5_VERSION) {
5445 if (bytes[0] != '<') {
5446 p = skip_over_field_name(bytes, true, length);
5447 legal = (p != NULL) && ((p - bytes) == (int)length);
5448 }
5449 } else if (_major_version >= CONSTANT_CLASS_DESCRIPTORS && bytes[length - 1] == ';' ) {
5450 // Support for L...; and Q...; descriptors
5451 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
5452 } else {
5453 // 4900761: relax the constraints based on JSR202 spec
5454 // Class names may be drawn from the entire Unicode character set.
5455 // Identifiers between '/' must be unqualified names.
5456 // The utf8 string has been verified when parsing cpool entries.
5457 legal = verify_unqualified_name(bytes, length, LegalClass);
5458 }
5459 }
5460 if (!legal) {
5461 ResourceMark rm(THREAD);
5462 assert(_class_name != NULL, "invariant");
5463 Exceptions::fthrow(
5464 THREAD_AND_LOCATION,
5465 vmSymbols::java_lang_ClassFormatError(),
5466 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5467 _class_name->as_C_string()
5468 );
5469 return;
5470 }
5471 }
5472
5473 // Checks if name is a legal field name.
5474 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5475 if (!_need_verify || _relax_verify) { return; }
5476
5477 char* bytes = (char*)name->bytes();
5478 unsigned int length = name->utf8_length();
5479 bool legal = false;
5480
5481 if (length > 0) {
5482 if (_major_version < JAVA_1_5_VERSION) {
5483 if (bytes[0] != '<') {
5484 const char* p = skip_over_field_name(bytes, false, length);
5485 legal = (p != NULL) && ((p - bytes) == (int)length);
5486 }
5487 } else {
5488 // 4881221: relax the constraints based on JSR202 spec
5489 legal = verify_unqualified_name(bytes, length, LegalField);
5490 }
5491 }
5492
5493 if (!legal) {
5494 ResourceMark rm(THREAD);
5495 assert(_class_name != NULL, "invariant");
5496 Exceptions::fthrow(
5497 THREAD_AND_LOCATION,
5498 vmSymbols::java_lang_ClassFormatError(),
5499 "Illegal field name \"%.*s\" in class %s", length, bytes,
5500 _class_name->as_C_string()
5501 );
5502 return;
5503 }
5504 }
5505
5506 // Checks if name is a legal method name.
5507 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5508 if (!_need_verify || _relax_verify) { return; }
5509
5510 assert(name != NULL, "method name is null");
5511 char* bytes = (char*)name->bytes();
5512 unsigned int length = name->utf8_length();
5513 bool legal = false;
5514
5515 if (length > 0) {
5516 if (bytes[0] == '<') {
5517 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5518 legal = true;
5519 }
5520 } else if (_major_version < JAVA_1_5_VERSION) {
5521 const char* p;
5522 p = skip_over_field_name(bytes, false, length);
5523 legal = (p != NULL) && ((p - bytes) == (int)length);
5524 } else {
5525 // 4881221: relax the constraints based on JSR202 spec
5526 legal = verify_unqualified_name(bytes, length, LegalMethod);
5527 }
5528 }
5529
5530 if (!legal) {
5531 ResourceMark rm(THREAD);
5532 assert(_class_name != NULL, "invariant");
5533 Exceptions::fthrow(
5534 THREAD_AND_LOCATION,
5535 vmSymbols::java_lang_ClassFormatError(),
5536 "Illegal method name \"%.*s\" in class %s", length, bytes,
5537 _class_name->as_C_string()
5538 );
5539 return;
5540 }
5541 }
5542
5543
5544 // Checks if signature is a legal field signature.
5545 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5546 const Symbol* signature,
5547 TRAPS) const {
5548 if (!_need_verify) { return; }
5549
5550 const char* const bytes = (const char* const)signature->bytes();
5551 const unsigned int length = signature->utf8_length();
5552 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5553
5554 if (p == NULL || (p - bytes) != (int)length) {
5555 throwIllegalSignature("Field", name, signature, CHECK);
5556 }
5557 }
5558
5559 // Checks if signature is a legal method signature.
5560 // Returns number of parameters
5561 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5562 const Symbol* signature,
5563 TRAPS) const {
5564 if (!_need_verify) {
5565 // make sure caller's args_size will be less than 0 even for non-static
5566 // method so it will be recomputed in compute_size_of_parameters().
5567 return -2;
5568 }
5569
5570 // Class initializers cannot have args for class format version >= 51.
5571 if (name == vmSymbols::class_initializer_name() &&
5572 signature != vmSymbols::void_method_signature() &&
5573 _major_version >= JAVA_7_VERSION) {
5574 throwIllegalSignature("Method", name, signature, CHECK_0);
5575 return 0;
5576 }
5577
5578 unsigned int args_size = 0;
5579 const char* p = (const char*)signature->bytes();
5580 unsigned int length = signature->utf8_length();
5581 const char* nextp;
5582
5583 // The first character must be a '('
5584 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5585 length--;
5586 // Skip over legal field signatures
5587 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5588 while ((length > 0) && (nextp != NULL)) {
5589 args_size++;
5590 if (p[0] == 'J' || p[0] == 'D') {
5591 args_size++;
5592 }
5593 length -= nextp - p;
5594 p = nextp;
5595 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5596 }
5597 // The first non-signature thing better be a ')'
5598 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5599 length--;
5600 if (name->utf8_length() > 0 && name->char_at(0) == '<') {
5601 // All internal methods must return void
5602 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5603 return args_size;
5604 }
5605 } else {
5606 // Now we better just have a return value
5607 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5608 if (nextp && ((int)length == (nextp - p))) {
5609 return args_size;
5610 }
5611 }
5612 }
5613 }
5614 // Report error
5615 throwIllegalSignature("Method", name, signature, CHECK_0);
5616 return 0;
5617 }
5618
5619 int ClassFileParser::static_field_size() const {
5620 assert(_field_info != NULL, "invariant");
5621 return _field_info->static_field_size;
5622 }
5623
5624 int ClassFileParser::total_oop_map_count() const {
5625 assert(_field_info != NULL, "invariant");
5626 return _field_info->oop_map_blocks->nonstatic_oop_map_count;
5627 }
5628
5629 jint ClassFileParser::layout_size() const {
5630 assert(_field_info != NULL, "invariant");
5631 return _field_info->instance_size;
5632 }
5633
5634 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5635 const Array<Method*>* methods) {
5636 assert(ik != NULL, "invariant");
5637 assert(methods != NULL, "invariant");
5638
5639 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5640 // (We used to do this lazily, but now we query it in Rewriter,
5641 // which is eagerly done for every method, so we might as well do it now,
5642 // when everything is fresh in memory.)
5643 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5644
5645 if (klass_id != vmSymbols::NO_SID) {
5646 for (int j = 0; j < methods->length(); ++j) {
5647 Method* method = methods->at(j);
5648 method->init_intrinsic_id();
5649
5650 if (CheckIntrinsics) {
5651 // Check if an intrinsic is defined for method 'method',
5652 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5653 if (method->intrinsic_id() != vmIntrinsics::_none &&
5654 !method->intrinsic_candidate()) {
5655 tty->print("Compiler intrinsic is defined for method [%s], "
5656 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5657 method->name_and_sig_as_C_string(),
5658 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5659 );
5660 tty->cr();
5661 DEBUG_ONLY(vm_exit(1));
5662 }
5663 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5664 // but there is no intrinsic available for it.
5665 if (method->intrinsic_candidate() &&
5666 method->intrinsic_id() == vmIntrinsics::_none) {
5667 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5668 "but no compiler intrinsic is defined for the method.%s",
5669 method->name_and_sig_as_C_string(),
5670 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5671 );
5672 tty->cr();
5673 DEBUG_ONLY(vm_exit(1));
5674 }
5675 }
5676 } // end for
5677
5678 #ifdef ASSERT
5679 if (CheckIntrinsics) {
5680 // Check for orphan methods in the current class. A method m
5681 // of a class C is orphan if an intrinsic is defined for method m,
5682 // but class C does not declare m.
5683 // The check is potentially expensive, therefore it is available
5684 // only in debug builds.
5685
5686 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5687 if (vmIntrinsics::_compiledLambdaForm == id) {
5688 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5689 // generated for the JVM from a LambdaForm and therefore no method
5690 // is defined for it.
5691 continue;
5692 }
5693
5694 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5695 // Check if the current class contains a method with the same
5696 // name, flags, signature.
5697 bool match = false;
5698 for (int j = 0; j < methods->length(); ++j) {
5699 const Method* method = methods->at(j);
5700 if (method->intrinsic_id() == id) {
5701 match = true;
5702 break;
5703 }
5704 }
5705
5706 if (!match) {
5707 char buf[1000];
5708 tty->print("Compiler intrinsic is defined for method [%s], "
5709 "but the method is not available in class [%s].%s",
5710 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5711 buf, sizeof(buf)),
5712 ik->name()->as_C_string(),
5713 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5714 );
5715 tty->cr();
5716 DEBUG_ONLY(vm_exit(1));
5717 }
5718 }
5719 } // end for
5720 } // CheckIntrinsics
5721 #endif // ASSERT
5722 }
5723 }
5724
5725 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5726 if (_klass != NULL) {
5727 return _klass;
5728 }
5729
5730 InstanceKlass* const ik =
5731 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5732
5733 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5734
5735 assert(_klass == ik, "invariant");
5736
5737
5738 if (ik->should_store_fingerprint()) {
5739 ik->store_fingerprint(_stream->compute_fingerprint());
5740 }
5741
5742 ik->set_has_passed_fingerprint_check(false);
5743 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5744 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5745 uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint();
5746 if (aot_fp != 0 && aot_fp == fp) {
5747 // This class matches with a class saved in an AOT library
5748 ik->set_has_passed_fingerprint_check(true);
5749 } else {
5750 ResourceMark rm;
5751 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5752 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5753 }
5754 }
5755
5756 if (ik->is_value()) {
5757 ValueKlass* vk = ValueKlass::cast(ik);
5758 oop val = ik->allocate_instance(CHECK_NULL);
5759 vk->set_default_value(val);
5760 }
5761
5762 return ik;
5763 }
5764
5765 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5766 assert(ik != NULL, "invariant");
5767
5768 // Set name and CLD before adding to CLD
5769 ik->set_class_loader_data(_loader_data);
5770 ik->set_name(_class_name);
5771
5772 // Add all classes to our internal class loader list here,
5773 // including classes in the bootstrap (NULL) class loader.
5774 const bool publicize = !is_internal();
5775
5776 _loader_data->add_class(ik, publicize);
5777
5778 set_klass_to_deallocate(ik);
5779
5780 assert(_field_info != NULL, "invariant");
5781 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5782 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->nonstatic_oop_map_count,
5783 "sanity");
5784
5785 assert(ik->is_instance_klass(), "sanity");
5786 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5787
5788 // Fill in information already parsed
5789 ik->set_should_verify_class(_need_verify);
5790
5791 // Not yet: supers are done below to support the new subtype-checking fields
5792 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5793 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5794 assert(_fac != NULL, "invariant");
5795 ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_FLATTENABLE]);
5796
5797 // this transfers ownership of a lot of arrays from
5798 // the parser onto the InstanceKlass*
5799 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5800
5801 // note that is not safe to use the fields in the parser from this point on
5802 assert(NULL == _cp, "invariant");
5803 assert(NULL == _fields, "invariant");
5804 assert(NULL == _methods, "invariant");
5805 assert(NULL == _inner_classes, "invariant");
5806 assert(NULL == _nest_members, "invariant");
5807 assert(NULL == _local_interfaces, "invariant");
5808 assert(NULL == _combined_annotations, "invariant");
5809
5810 if (_has_final_method) {
5811 ik->set_has_final_method();
5812 }
5813
5814 ik->copy_method_ordering(_method_ordering, CHECK);
5815 // The InstanceKlass::_methods_jmethod_ids cache
5816 // is managed on the assumption that the initial cache
5817 // size is equal to the number of methods in the class. If
5818 // that changes, then InstanceKlass::idnum_can_increment()
5819 // has to be changed accordingly.
5820 ik->set_initial_method_idnum(ik->methods()->length());
5821
5822 ik->set_this_class_index(_this_class_index);
5823
5824 if (is_unsafe_anonymous()) {
5825 // _this_class_index is a CONSTANT_Class entry that refers to this
5826 // anonymous class itself. If this class needs to refer to its own methods or
5827 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5828 // _this_class_index. However, because this class is anonymous (it's
5829 // not stored in SystemDictionary), _this_class_index cannot be resolved
5830 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5831 // Therefore, we must eagerly resolve _this_class_index now.
5832 ik->constants()->klass_at_put(_this_class_index, ik);
5833 }
5834
5835 ik->set_minor_version(_minor_version);
5836 ik->set_major_version(_major_version);
5837 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5838 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5839
5840 if (_unsafe_anonymous_host != NULL) {
5841 assert (ik->is_unsafe_anonymous(), "should be the same");
5842 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host);
5843 }
5844
5845 // Set PackageEntry for this_klass
5846 oop cl = ik->class_loader();
5847 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5848 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5849 ik->set_package(cld, CHECK);
5850
5851 const Array<Method*>* const methods = ik->methods();
5852 assert(methods != NULL, "invariant");
5853 const int methods_len = methods->length();
5854
5855 check_methods_for_intrinsics(ik, methods);
5856
5857 // Fill in field values obtained by parse_classfile_attributes
5858 if (_parsed_annotations->has_any_annotations()) {
5859 _parsed_annotations->apply_to(ik);
5860 }
5861
5862 apply_parsed_class_attributes(ik);
5863
5864 // Miranda methods
5865 if ((_num_miranda_methods > 0) ||
5866 // if this class introduced new miranda methods or
5867 (_super_klass != NULL && _super_klass->has_miranda_methods())
5868 // super class exists and this class inherited miranda methods
5869 ) {
5870 ik->set_has_miranda_methods(); // then set a flag
5871 }
5872
5873 // Fill in information needed to compute superclasses.
5874 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5875 ik->set_transitive_interfaces(_transitive_interfaces);
5876 _transitive_interfaces = NULL;
5877
5878 // Initialize itable offset tables
5879 klassItable::setup_itable_offset_table(ik);
5880
5881 // Compute transitive closure of interfaces this class implements
5882 // Do final class setup
5883 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5884 if (oop_map_blocks->nonstatic_oop_map_count > 0) {
5885 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5886 }
5887
5888 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5889 set_precomputed_flags(ik, CHECK);
5890
5891 // check if this class can access its super class
5892 check_super_class_access(ik, CHECK);
5893
5894 // check if this class can access its superinterfaces
5895 check_super_interface_access(ik, CHECK);
5896
5897 // check if this class overrides any final method
5898 check_final_method_override(ik, CHECK);
5899
5900 // reject static interface methods prior to Java 8
5901 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5902 check_illegal_static_method(ik, CHECK);
5903 }
5904
5905 // Obtain this_klass' module entry
5906 ModuleEntry* module_entry = ik->module();
5907 assert(module_entry != NULL, "module_entry should always be set");
5908
5909 // Obtain java.lang.Module
5910 Handle module_handle(THREAD, module_entry->module());
5911
5912 // Allocate mirror and initialize static fields
5913 // The create_mirror() call will also call compute_modifiers()
5914 java_lang_Class::create_mirror(ik,
5915 Handle(THREAD, _loader_data->class_loader()),
5916 module_handle,
5917 _protection_domain,
5918 CHECK);
5919
5920 assert(_all_mirandas != NULL, "invariant");
5921
5922 // Generate any default methods - default methods are public interface methods
5923 // that have a default implementation. This is new with Java 8.
5924 if (_has_nonstatic_concrete_methods) {
5925 DefaultMethods::generate_default_methods(ik,
5926 _all_mirandas,
5927 CHECK);
5928 }
5929
5930 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5931 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5932 !module_entry->has_default_read_edges()) {
5933 if (!module_entry->set_has_default_read_edges()) {
5934 // We won a potential race
5935 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5936 }
5937 }
5938
5939 int nfields = ik->java_fields_count();
5940 if (ik->is_value()) nfields++;
5941 for (int i = 0; i < nfields; i++) {
5942 if (ik->field_access_flags(i) & JVM_ACC_FLATTENABLE) {
5943 Symbol* klass_name = ik->field_signature(i)->fundamental_name(CHECK);
5944 // Value classes must have been pre-loaded
5945 Klass* klass = SystemDictionary::find(klass_name,
5946 Handle(THREAD, ik->class_loader()),
5947 Handle(THREAD, ik->protection_domain()), CHECK);
5948 assert(klass != NULL, "Sanity check");
5949 assert(klass->access_flags().is_value_type(), "Value type expected");
5950 ik->set_value_field_klass(i, klass);
5951 klass_name->decrement_refcount();
5952 } else if (is_value_type() && ((ik->field_access_flags(i) & JVM_ACC_FIELD_INTERNAL) != 0)
5953 && ((ik->field_access_flags(i) & JVM_ACC_STATIC) != 0)) {
5954 ValueKlass::cast(ik)->set_default_value_offset(ik->field_offset(i));
5955 }
5956 }
5957
5958 if (is_value_type()) {
5959 ValueKlass::cast(ik)->initialize_calling_convention(CHECK);
5960 }
5961
5962 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5963
5964 if (!is_internal()) {
5965 if (log_is_enabled(Info, class, load)) {
5966 ResourceMark rm;
5967 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5968 ik->print_class_load_logging(_loader_data, module_name, _stream);
5969 }
5970
5971 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5972 ik->major_version() != JAVA_MIN_SUPPORTED_VERSION &&
5973 log_is_enabled(Info, class, preview)) {
5974 ResourceMark rm;
5975 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5976 ik->external_name(), ik->major_version());
5977 }
5978
5979 if (log_is_enabled(Debug, class, resolve)) {
5980 ResourceMark rm;
5981 // print out the superclass.
5982 const char * from = ik->external_name();
5983 if (ik->java_super() != NULL) {
5984 log_debug(class, resolve)("%s %s (super)",
5985 from,
5986 ik->java_super()->external_name());
5987 }
5988 // print out each of the interface classes referred to by this class.
5989 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5990 if (local_interfaces != NULL) {
5991 const int length = local_interfaces->length();
5992 for (int i = 0; i < length; i++) {
5993 const InstanceKlass* const k = local_interfaces->at(i);
5994 const char * to = k->external_name();
5995 log_debug(class, resolve)("%s %s (interface)", from, to);
5996 }
5997 }
5998 }
5999 }
6000
6001 JFR_ONLY(INIT_ID(ik);)
6002
6003 // If we reach here, all is well.
6004 // Now remove the InstanceKlass* from the _klass_to_deallocate field
6005 // in order for it to not be destroyed in the ClassFileParser destructor.
6006 set_klass_to_deallocate(NULL);
6007
6008 // it's official
6009 set_klass(ik);
6010
6011 debug_only(ik->verify();)
6012 }
6013
6014 void ClassFileParser::update_class_name(Symbol* new_class_name) {
6015 // Decrement the refcount in the old name, since we're clobbering it.
6016 _class_name->decrement_refcount();
6017
6018 _class_name = new_class_name;
6019 // Increment the refcount of the new name.
6020 // Now the ClassFileParser owns this name and will decrement in
6021 // the destructor.
6022 _class_name->increment_refcount();
6023 }
6024
6025
6026 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's
6027 // package by prepending its host class's package name to its class name and setting
6028 // its _class_name field.
6029 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) {
6030 ResourceMark rm(THREAD);
6031 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
6032 "Unsafe anonymous class should not be in a package");
6033 const char* host_pkg_name =
6034 ClassLoader::package_from_name(unsafe_anonymous_host->name()->as_C_string(), NULL);
6035
6036 if (host_pkg_name != NULL) {
6037 int host_pkg_len = (int)strlen(host_pkg_name);
6038 int class_name_len = _class_name->utf8_length();
6039 int symbol_len = host_pkg_len + 1 + class_name_len;
6040 char* new_anon_name = NEW_RESOURCE_ARRAY(char, symbol_len + 1);
6041 int n = os::snprintf(new_anon_name, symbol_len + 1, "%s/%.*s",
6042 host_pkg_name, class_name_len, _class_name->base());
6043 assert(n == symbol_len, "Unexpected number of characters in string");
6044
6045 // Decrement old _class_name to avoid leaking.
6046 _class_name->decrement_refcount();
6047
6048 // Create a symbol and update the anonymous class name.
6049 // The new class name is created with a refcount of one. When installed into the InstanceKlass,
6050 // it'll be two and when the ClassFileParser destructor runs, it'll go back to one and get deleted
6051 // when the class is unloaded.
6052 _class_name = SymbolTable::new_symbol(new_anon_name, symbol_len, CHECK);
6053 }
6054 }
6055
6056 // If the host class and the anonymous class are in the same package then do
6057 // nothing. If the anonymous class is in the unnamed package then move it to its
6058 // host's package. If the classes are in different packages then throw an IAE
6059 // exception.
6060 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) {
6061 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class");
6062
6063 const jbyte* anon_last_slash = UTF8::strrchr((const jbyte*)_class_name->base(),
6064 _class_name->utf8_length(), '/');
6065 if (anon_last_slash == NULL) { // Unnamed package
6066 prepend_host_package_name(_unsafe_anonymous_host, CHECK);
6067 } else {
6068 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) {
6069 ResourceMark rm(THREAD);
6070 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
6071 err_msg("Host class %s and anonymous class %s are in different packages",
6072 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string()));
6073 }
6074 }
6075 }
6076
6077 static bool relax_format_check_for(ClassLoaderData* loader_data) {
6078 bool trusted = (loader_data->is_the_null_class_loader_data() ||
6079 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
6080 bool need_verify =
6081 // verifyAll
6082 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
6083 // verifyRemote
6084 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
6085 return !need_verify;
6086 }
6087
6088 ClassFileParser::ClassFileParser(ClassFileStream* stream,
6089 Symbol* name,
6090 ClassLoaderData* loader_data,
6091 Handle protection_domain,
6092 const InstanceKlass* unsafe_anonymous_host,
6093 GrowableArray<Handle>* cp_patches,
6094 Publicity pub_level,
6095 TRAPS) :
6096 _stream(stream),
6097 _requested_name(name),
6098 _class_name(NULL),
6099 _loader_data(loader_data),
6100 _unsafe_anonymous_host(unsafe_anonymous_host),
6101 _cp_patches(cp_patches),
6102 _num_patched_klasses(0),
6103 _max_num_patched_klasses(0),
6104 _orig_cp_size(0),
6105 _first_patched_klass_resolved_index(0),
6106 _super_klass(),
6107 _cp(NULL),
6108 _fields(NULL),
6109 _methods(NULL),
6110 _inner_classes(NULL),
6111 _nest_members(NULL),
6112 _nest_host(0),
6113 _local_interfaces(NULL),
6114 _transitive_interfaces(NULL),
6115 _combined_annotations(NULL),
6116 _annotations(NULL),
6117 _type_annotations(NULL),
6118 _fields_annotations(NULL),
6119 _fields_type_annotations(NULL),
6120 _klass(NULL),
6121 _klass_to_deallocate(NULL),
6122 _parsed_annotations(NULL),
6123 _fac(NULL),
6124 _field_info(NULL),
6125 _method_ordering(NULL),
6126 _all_mirandas(NULL),
6127 _vtable_size(0),
6128 _itable_size(0),
6129 _num_miranda_methods(0),
6130 _rt(REF_NONE),
6131 _protection_domain(protection_domain),
6132 _access_flags(),
6133 _pub_level(pub_level),
6134 _bad_constant_seen(0),
6135 _synthetic_flag(false),
6136 _sde_length(false),
6137 _sde_buffer(NULL),
6138 _sourcefile_index(0),
6139 _generic_signature_index(0),
6140 _major_version(0),
6141 _minor_version(0),
6142 _this_class_index(0),
6143 _super_class_index(0),
6144 _itfs_len(0),
6145 _java_fields_count(0),
6146 _need_verify(false),
6147 _relax_verify(false),
6148 _has_nonstatic_concrete_methods(false),
6149 _declares_nonstatic_concrete_methods(false),
6150 _has_final_method(false),
6151 _has_flattenable_fields(false),
6152 _has_finalizer(false),
6153 _has_empty_finalizer(false),
6154 _has_vanilla_constructor(false),
6155 _max_bootstrap_specifier_index(-1) {
6156
6157 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6158 _class_name->increment_refcount();
6159
6160 assert(THREAD->is_Java_thread(), "invariant");
6161 assert(_loader_data != NULL, "invariant");
6162 assert(stream != NULL, "invariant");
6163 assert(_stream != NULL, "invariant");
6164 assert(_stream->buffer() == _stream->current(), "invariant");
6165 assert(_class_name != NULL, "invariant");
6166 assert(0 == _access_flags.as_int(), "invariant");
6167
6168 // Figure out whether we can skip format checking (matching classic VM behavior)
6169 if (DumpSharedSpaces) {
6170 // verify == true means it's a 'remote' class (i.e., non-boot class)
6171 // Verification decision is based on BytecodeVerificationRemote flag
6172 // for those classes.
6173 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
6174 BytecodeVerificationLocal;
6175 }
6176 else {
6177 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
6178 stream->need_verify());
6179 }
6180 if (_cp_patches != NULL) {
6181 int len = _cp_patches->length();
6182 for (int i=0; i<len; i++) {
6183 if (has_cp_patch_at(i)) {
6184 Handle patch = cp_patch_at(i);
6185 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
6186 // We need to append the names of the patched classes to the end of the constant pool,
6187 // because a patched class may have a Utf8 name that's not already included in the
6188 // original constant pool. These class names are used when patch_constant_pool()
6189 // calls patch_class().
6190 //
6191 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
6192 // At this point, we don't know the tag for index i yet, because we haven't parsed the
6193 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
6194 _max_num_patched_klasses++;
6195 }
6196 }
6197 }
6198 }
6199
6200 // synch back verification state to stream
6201 stream->set_verify(_need_verify);
6202
6203 // Check if verification needs to be relaxed for this class file
6204 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
6205 _relax_verify = relax_format_check_for(_loader_data);
6206
6207 parse_stream(stream, CHECK);
6208
6209 post_process_parsed_stream(stream, _cp, CHECK);
6210 }
6211
6212 void ClassFileParser::clear_class_metadata() {
6213 // metadata created before the instance klass is created. Must be
6214 // deallocated if classfile parsing returns an error.
6215 _cp = NULL;
6216 _fields = NULL;
6217 _methods = NULL;
6218 _inner_classes = NULL;
6219 _nest_members = NULL;
6220 _local_interfaces = NULL;
6221 _combined_annotations = NULL;
6222 _annotations = _type_annotations = NULL;
6223 _fields_annotations = _fields_type_annotations = NULL;
6224 }
6225
6226 // Destructor to clean up
6227 ClassFileParser::~ClassFileParser() {
6228 _class_name->decrement_refcount();
6229
6230 if (_cp != NULL) {
6231 MetadataFactory::free_metadata(_loader_data, _cp);
6232 }
6233 if (_fields != NULL) {
6234 MetadataFactory::free_array<u2>(_loader_data, _fields);
6235 }
6236
6237 if (_methods != NULL) {
6238 // Free methods
6239 InstanceKlass::deallocate_methods(_loader_data, _methods);
6240 }
6241
6242 // beware of the Universe::empty_blah_array!!
6243 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6244 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6245 }
6246
6247 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
6248 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6249 }
6250
6251 // Free interfaces
6252 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6253 _local_interfaces, _transitive_interfaces);
6254
6255 if (_combined_annotations != NULL) {
6256 // After all annotations arrays have been created, they are installed into the
6257 // Annotations object that will be assigned to the InstanceKlass being created.
6258
6259 // Deallocate the Annotations object and the installed annotations arrays.
6260 _combined_annotations->deallocate_contents(_loader_data);
6261
6262 // If the _combined_annotations pointer is non-NULL,
6263 // then the other annotations fields should have been cleared.
6264 assert(_annotations == NULL, "Should have been cleared");
6265 assert(_type_annotations == NULL, "Should have been cleared");
6266 assert(_fields_annotations == NULL, "Should have been cleared");
6267 assert(_fields_type_annotations == NULL, "Should have been cleared");
6268 } else {
6269 // If the annotations arrays were not installed into the Annotations object,
6270 // then they have to be deallocated explicitly.
6271 MetadataFactory::free_array<u1>(_loader_data, _annotations);
6272 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
6273 Annotations::free_contents(_loader_data, _fields_annotations);
6274 Annotations::free_contents(_loader_data, _fields_type_annotations);
6275 }
6276
6277 clear_class_metadata();
6278 _transitive_interfaces = NULL;
6279
6280 // deallocate the klass if already created. Don't directly deallocate, but add
6281 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6282 // at a safepoint.
6283 if (_klass_to_deallocate != NULL) {
6284 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6285 }
6286 }
6287
6288 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6289 TRAPS) {
6290
6291 assert(stream != NULL, "invariant");
6292 assert(_class_name != NULL, "invariant");
6293
6294 // BEGIN STREAM PARSING
6295 stream->guarantee_more(8, CHECK); // magic, major, minor
6296 // Magic value
6297 const u4 magic = stream->get_u4_fast();
6298 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6299 "Incompatible magic value %u in class file %s",
6300 magic, CHECK);
6301
6302 // Version numbers
6303 _minor_version = stream->get_u2_fast();
6304 _major_version = stream->get_u2_fast();
6305
6306 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) {
6307 ResourceMark rm;
6308 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
6309 _major_version, _minor_version, _class_name->as_C_string());
6310 Exceptions::fthrow(
6311 THREAD_AND_LOCATION,
6312 vmSymbols::java_lang_UnsupportedClassVersionError(),
6313 "Unsupported major.minor version for dump time %u.%u",
6314 _major_version,
6315 _minor_version);
6316 }
6317
6318 // Check version numbers - we check this even with verifier off
6319 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6320
6321 stream->guarantee_more(3, CHECK); // length, first cp tag
6322 u2 cp_size = stream->get_u2_fast();
6323
6324 guarantee_property(
6325 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6326 cp_size, CHECK);
6327
6328 _orig_cp_size = cp_size;
6329 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6330 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6331 }
6332 cp_size += _max_num_patched_klasses;
6333
6334 _cp = ConstantPool::allocate(_loader_data,
6335 cp_size,
6336 CHECK);
6337
6338 ConstantPool* const cp = _cp;
6339
6340 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6341
6342 assert(cp_size == (const u2)cp->length(), "invariant");
6343
6344 // ACCESS FLAGS
6345 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6346
6347 jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
6348 // JVM_ACC_MODULE is defined in JDK-9 and later.
6349 if (_major_version >= JAVA_9_VERSION) {
6350 recognized_modifiers |= JVM_ACC_MODULE;
6351 }
6352 // JVM_ACC_VALUE is defined for class file version 55 and later
6353 if (supports_value_types()) {
6354 recognized_modifiers |= JVM_ACC_VALUE;
6355 }
6356
6357 // Access flags
6358 jint flags = stream->get_u2_fast() & recognized_modifiers;
6359
6360 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6361 // Set abstract bit for old class files for backward compatibility
6362 flags |= JVM_ACC_ABSTRACT;
6363 }
6364
6365 verify_legal_class_modifiers(flags, CHECK);
6366
6367 short bad_constant = class_bad_constant_seen();
6368 if (bad_constant != 0) {
6369 // Do not throw CFE until after the access_flags are checked because if
6370 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6371 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6372 }
6373
6374 _access_flags.set_flags(flags);
6375
6376 // This class and superclass
6377 _this_class_index = stream->get_u2_fast();
6378 check_property(
6379 valid_cp_range(_this_class_index, cp_size) &&
6380 cp->tag_at(_this_class_index).is_unresolved_klass(),
6381 "Invalid this class index %u in constant pool in class file %s",
6382 _this_class_index, CHECK);
6383
6384 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6385 assert(class_name_in_cp != NULL, "class_name can't be null");
6386
6387 // Update _class_name to reflect the name in the constant pool
6388 update_class_name(class_name_in_cp);
6389
6390 // Don't need to check whether this class name is legal or not.
6391 // It has been checked when constant pool is parsed.
6392 // However, make sure it is not an array type.
6393 if (_need_verify) {
6394 guarantee_property(_class_name->char_at(0) != JVM_SIGNATURE_ARRAY,
6395 "Bad class name in class file %s",
6396 CHECK);
6397 }
6398
6399 // Checks if name in class file matches requested name
6400 if (_requested_name != NULL && _requested_name != _class_name) {
6401 ResourceMark rm(THREAD);
6402 Exceptions::fthrow(
6403 THREAD_AND_LOCATION,
6404 vmSymbols::java_lang_NoClassDefFoundError(),
6405 "%s (wrong name: %s)",
6406 _class_name->as_C_string(),
6407 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6408 );
6409 return;
6410 }
6411
6412 // if this is an anonymous class fix up its name if it's in the unnamed
6413 // package. Otherwise, throw IAE if it is in a different package than
6414 // its host class.
6415 if (_unsafe_anonymous_host != NULL) {
6416 fix_unsafe_anonymous_class_name(CHECK);
6417 }
6418
6419 // Verification prevents us from creating names with dots in them, this
6420 // asserts that that's the case.
6421 assert(is_internal_format(_class_name), "external class name format used internally");
6422
6423 if (!is_internal()) {
6424 LogTarget(Debug, class, preorder) lt;
6425 if (lt.is_enabled()){
6426 ResourceMark rm(THREAD);
6427 LogStream ls(lt);
6428 ls.print("%s", _class_name->as_klass_external_name());
6429 if (stream->source() != NULL) {
6430 ls.print(" source: %s", stream->source());
6431 }
6432 ls.cr();
6433 }
6434
6435 #if INCLUDE_CDS
6436 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6437 if (!ClassLoader::has_jrt_entry()) {
6438 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6439 DumpLoadedClassList = NULL;
6440 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6441 _unsafe_anonymous_host == NULL) {
6442 // Only dump the classes that can be stored into CDS archive.
6443 // Unsafe anonymous classes such as generated LambdaForm classes are also not included.
6444 oop class_loader = _loader_data->class_loader();
6445 ResourceMark rm(THREAD);
6446 bool skip = false;
6447 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6448 // For the boot and platform class loaders, skip classes that are not found in the
6449 // java runtime image, such as those found in the --patch-module entries.
6450 // These classes can't be loaded from the archive during runtime.
6451 if (!stream->from_boot_loader_modules_image() && strncmp(stream->source(), "jrt:", 4) != 0) {
6452 skip = true;
6453 }
6454
6455 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6456 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6457 // as they can be loaded from the archive during runtime.
6458 skip = false;
6459 }
6460 }
6461 if (skip) {
6462 tty->print_cr("skip writing class %s from source %s to classlist file",
6463 _class_name->as_C_string(), stream->source());
6464 } else {
6465 classlist_file->print_cr("%s", _class_name->as_C_string());
6466 classlist_file->flush();
6467 }
6468 }
6469 }
6470 #endif
6471 }
6472
6473 // SUPERKLASS
6474 _super_class_index = stream->get_u2_fast();
6475 _super_klass = parse_super_class(cp,
6476 _super_class_index,
6477 _need_verify,
6478 CHECK);
6479
6480 // Interfaces
6481 _itfs_len = stream->get_u2_fast();
6482 parse_interfaces(stream,
6483 _itfs_len,
6484 cp,
6485 &_has_nonstatic_concrete_methods,
6486 CHECK);
6487
6488 assert(_local_interfaces != NULL, "invariant");
6489
6490 // Fields (offsets are filled in later)
6491 _fac = new FieldAllocationCount();
6492 parse_fields(stream,
6493 _access_flags.is_interface(),
6494 _access_flags.is_value_type(),
6495 _fac,
6496 cp,
6497 cp_size,
6498 &_java_fields_count,
6499 CHECK);
6500
6501 assert(_fields != NULL, "invariant");
6502
6503 // Methods
6504 AccessFlags promoted_flags;
6505 parse_methods(stream,
6506 _access_flags.is_interface(),
6507 _access_flags.is_value_type(),
6508 &promoted_flags,
6509 &_has_final_method,
6510 &_declares_nonstatic_concrete_methods,
6511 CHECK);
6512
6513 assert(_methods != NULL, "invariant");
6514
6515 // promote flags from parse_methods() to the klass' flags
6516 _access_flags.add_promoted_flags(promoted_flags.as_int());
6517
6518 if (_declares_nonstatic_concrete_methods) {
6519 _has_nonstatic_concrete_methods = true;
6520 }
6521
6522 // Additional attributes/annotations
6523 _parsed_annotations = new ClassAnnotationCollector();
6524 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6525
6526 assert(_inner_classes != NULL, "invariant");
6527
6528 // Finalize the Annotations metadata object,
6529 // now that all annotation arrays have been created.
6530 create_combined_annotations(CHECK);
6531
6532 // Make sure this is the end of class file stream
6533 guarantee_property(stream->at_eos(),
6534 "Extra bytes at the end of class file %s",
6535 CHECK);
6536
6537 // all bytes in stream read and parsed
6538 }
6539
6540 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6541 ConstantPool* cp,
6542 TRAPS) {
6543 assert(stream != NULL, "invariant");
6544 assert(stream->at_eos(), "invariant");
6545 assert(cp != NULL, "invariant");
6546 assert(_loader_data != NULL, "invariant");
6547
6548 if (_class_name == vmSymbols::java_lang_Object()) {
6549 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6550 "java.lang.Object cannot implement an interface in class file %s",
6551 CHECK);
6552 }
6553 // We check super class after class file is parsed and format is checked
6554 if (_super_class_index > 0 && NULL ==_super_klass) {
6555 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6556 if (_access_flags.is_interface()) {
6557 // Before attempting to resolve the superclass, check for class format
6558 // errors not checked yet.
6559 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6560 "Interfaces must have java.lang.Object as superclass in class file %s",
6561 CHECK);
6562 }
6563 Handle loader(THREAD, _loader_data->class_loader());
6564 _super_klass = (const InstanceKlass*)
6565 SystemDictionary::resolve_super_or_fail(_class_name,
6566 super_class_name,
6567 loader,
6568 _protection_domain,
6569 true,
6570 CHECK);
6571 }
6572
6573 if (_super_klass != NULL) {
6574 if (_super_klass->has_nonstatic_concrete_methods()) {
6575 _has_nonstatic_concrete_methods = true;
6576 }
6577
6578 if (_super_klass->is_interface()) {
6579 ResourceMark rm(THREAD);
6580 Exceptions::fthrow(
6581 THREAD_AND_LOCATION,
6582 vmSymbols::java_lang_IncompatibleClassChangeError(),
6583 "class %s has interface %s as super class",
6584 _class_name->as_klass_external_name(),
6585 _super_klass->external_name()
6586 );
6587 return;
6588 }
6589
6590 // For a value class, only java/lang/Object is an acceptable super class
6591 if (_access_flags.get_flags() & JVM_ACC_VALUE) {
6592 guarantee_property(_super_klass->name() == vmSymbols::java_lang_Object(),
6593 "Value type must have java.lang.Object as superclass in class file %s",
6594 CHECK);
6595 }
6596
6597 // Make sure super class is not final
6598 if (_super_klass->is_final()) {
6599 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6600 }
6601 }
6602
6603 // Compute the transitive list of all unique interfaces implemented by this class
6604 _transitive_interfaces =
6605 compute_transitive_interfaces(_super_klass,
6606 _local_interfaces,
6607 _loader_data,
6608 CHECK);
6609
6610 assert(_transitive_interfaces != NULL, "invariant");
6611
6612 // sort methods
6613 _method_ordering = sort_methods(_methods);
6614
6615 _all_mirandas = new GrowableArray<Method*>(20);
6616
6617 Handle loader(THREAD, _loader_data->class_loader());
6618 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6619 &_num_miranda_methods,
6620 _all_mirandas,
6621 _super_klass,
6622 _methods,
6623 _access_flags,
6624 _major_version,
6625 loader,
6626 _class_name,
6627 _local_interfaces,
6628 CHECK);
6629
6630 // Size of Java itable (in words)
6631 _itable_size = _access_flags.is_interface() ? 0 :
6632 klassItable::compute_itable_size(_transitive_interfaces);
6633
6634 assert(_fac != NULL, "invariant");
6635 assert(_parsed_annotations != NULL, "invariant");
6636
6637
6638 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
6639 if (fs.is_flattenable()) {
6640 // Pre-load value class
6641 Klass* klass = SystemDictionary::resolve_flattenable_field_or_fail(&fs,
6642 Handle(THREAD, _loader_data->class_loader()),
6643 _protection_domain, true, CHECK);
6644 assert(klass != NULL, "Sanity check");
6645 assert(klass->access_flags().is_value_type(), "Value type expected");
6646 _has_flattenable_fields = true;
6647 }
6648 }
6649
6650 _field_info = new FieldLayoutInfo();
6651 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6652
6653 // Compute reference typ
6654 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6655
6656 }
6657
6658 void ClassFileParser::set_klass(InstanceKlass* klass) {
6659
6660 #ifdef ASSERT
6661 if (klass != NULL) {
6662 assert(NULL == _klass, "leaking?");
6663 }
6664 #endif
6665
6666 _klass = klass;
6667 }
6668
6669 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6670
6671 #ifdef ASSERT
6672 if (klass != NULL) {
6673 assert(NULL == _klass_to_deallocate, "leaking?");
6674 }
6675 #endif
6676
6677 _klass_to_deallocate = klass;
6678 }
6679
6680 // Caller responsible for ResourceMark
6681 // clone stream with rewound position
6682 const ClassFileStream* ClassFileParser::clone_stream() const {
6683 assert(_stream != NULL, "invariant");
6684
6685 return _stream->clone();
6686 }
6687
6688 // ----------------------------------------------------------------------------
6689 // debugging
6690
6691 #ifdef ASSERT
6692
6693 // return true if class_name contains no '.' (internal format is '/')
6694 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6695 if (class_name != NULL) {
6696 ResourceMark rm;
6697 char* name = class_name->as_C_string();
6698 return strchr(name, '.') == NULL;
6699 } else {
6700 return true;
6701 }
6702 }
6703
6704 #endif