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.inline.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/recordComponent.hpp"
59 #include "oops/symbol.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 JAVA_14_VERSION 58
130
131 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
132 assert((bad_constant == JVM_CONSTANT_Module ||
133 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
134 "Unexpected bad constant pool entry");
135 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
136 }
137
138 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
139 ConstantPool* cp,
140 const int length,
141 TRAPS) {
142 assert(stream != NULL, "invariant");
143 assert(cp != NULL, "invariant");
144
145 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
146 // this function (_current can be allocated in a register, with scalar
147 // replacement of aggregates). The _current pointer is copied back to
148 // stream() when this function returns. DON'T call another method within
149 // this method that uses stream().
150 const ClassFileStream cfs1 = *stream;
151 const ClassFileStream* const cfs = &cfs1;
152
153 assert(cfs->allocated_on_stack(), "should be local");
154 debug_only(const u1* const old_current = stream->current();)
155
156 // Used for batching symbol allocations.
157 const char* names[SymbolTable::symbol_alloc_batch_size];
158 int lengths[SymbolTable::symbol_alloc_batch_size];
159 int indices[SymbolTable::symbol_alloc_batch_size];
160 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
161 int names_count = 0;
162
163 // parsing Index 0 is unused
164 for (int index = 1; index < length; index++) {
165 // Each of the following case guarantees one more byte in the stream
166 // for the following tag or the access_flags following constant pool,
167 // so we don't need bounds-check for reading tag.
168 const u1 tag = cfs->get_u1_fast();
169 switch (tag) {
170 case JVM_CONSTANT_Class : {
171 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
172 const u2 name_index = cfs->get_u2_fast();
173 cp->klass_index_at_put(index, name_index);
174 break;
175 }
176 case JVM_CONSTANT_Fieldref: {
177 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
178 const u2 class_index = cfs->get_u2_fast();
179 const u2 name_and_type_index = cfs->get_u2_fast();
180 cp->field_at_put(index, class_index, name_and_type_index);
181 break;
182 }
183 case JVM_CONSTANT_Methodref: {
184 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
185 const u2 class_index = cfs->get_u2_fast();
186 const u2 name_and_type_index = cfs->get_u2_fast();
187 cp->method_at_put(index, class_index, name_and_type_index);
188 break;
189 }
190 case JVM_CONSTANT_InterfaceMethodref: {
191 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
192 const u2 class_index = cfs->get_u2_fast();
193 const u2 name_and_type_index = cfs->get_u2_fast();
194 cp->interface_method_at_put(index, class_index, name_and_type_index);
195 break;
196 }
197 case JVM_CONSTANT_String : {
198 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
199 const u2 string_index = cfs->get_u2_fast();
200 cp->string_index_at_put(index, string_index);
201 break;
202 }
203 case JVM_CONSTANT_MethodHandle :
204 case JVM_CONSTANT_MethodType: {
205 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
206 classfile_parse_error(
207 "Class file version does not support constant tag %u in class file %s",
208 tag, CHECK);
209 }
210 if (tag == JVM_CONSTANT_MethodHandle) {
211 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
212 const u1 ref_kind = cfs->get_u1_fast();
213 const u2 method_index = cfs->get_u2_fast();
214 cp->method_handle_index_at_put(index, ref_kind, method_index);
215 }
216 else if (tag == JVM_CONSTANT_MethodType) {
217 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
218 const u2 signature_index = cfs->get_u2_fast();
219 cp->method_type_index_at_put(index, signature_index);
220 }
221 else {
222 ShouldNotReachHere();
223 }
224 break;
225 }
226 case JVM_CONSTANT_Dynamic : {
227 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
228 classfile_parse_error(
229 "Class file version does not support constant tag %u in class file %s",
230 tag, CHECK);
231 }
232 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
233 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
234 const u2 name_and_type_index = cfs->get_u2_fast();
235 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
236 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
237 }
238 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
239 break;
240 }
241 case JVM_CONSTANT_InvokeDynamic : {
242 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
243 classfile_parse_error(
244 "Class file version does not support constant tag %u in class file %s",
245 tag, CHECK);
246 }
247 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
248 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
249 const u2 name_and_type_index = cfs->get_u2_fast();
250 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
251 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
252 }
253 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
254 break;
255 }
256 case JVM_CONSTANT_Integer: {
257 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
258 const u4 bytes = cfs->get_u4_fast();
259 cp->int_at_put(index, (jint)bytes);
260 break;
261 }
262 case JVM_CONSTANT_Float: {
263 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
264 const u4 bytes = cfs->get_u4_fast();
265 cp->float_at_put(index, *(jfloat*)&bytes);
266 break;
267 }
268 case JVM_CONSTANT_Long: {
269 // A mangled type might cause you to overrun allocated memory
270 guarantee_property(index + 1 < length,
271 "Invalid constant pool entry %u in class file %s",
272 index,
273 CHECK);
274 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
275 const u8 bytes = cfs->get_u8_fast();
276 cp->long_at_put(index, bytes);
277 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
278 break;
279 }
280 case JVM_CONSTANT_Double: {
281 // A mangled type might cause you to overrun allocated memory
282 guarantee_property(index+1 < length,
283 "Invalid constant pool entry %u in class file %s",
284 index,
285 CHECK);
286 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
287 const u8 bytes = cfs->get_u8_fast();
288 cp->double_at_put(index, *(jdouble*)&bytes);
289 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
290 break;
291 }
292 case JVM_CONSTANT_NameAndType: {
293 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
294 const u2 name_index = cfs->get_u2_fast();
295 const u2 signature_index = cfs->get_u2_fast();
296 cp->name_and_type_at_put(index, name_index, signature_index);
297 break;
298 }
299 case JVM_CONSTANT_Utf8 : {
300 cfs->guarantee_more(2, CHECK); // utf8_length
301 u2 utf8_length = cfs->get_u2_fast();
302 const u1* utf8_buffer = cfs->current();
303 assert(utf8_buffer != NULL, "null utf8 buffer");
304 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
305 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
306 cfs->skip_u1_fast(utf8_length);
307
308 // Before storing the symbol, make sure it's legal
309 if (_need_verify) {
310 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
311 }
312
313 if (has_cp_patch_at(index)) {
314 Handle patch = clear_cp_patch_at(index);
315 guarantee_property(java_lang_String::is_instance(patch()),
316 "Illegal utf8 patch at %d in class file %s",
317 index,
318 CHECK);
319 const char* const str = java_lang_String::as_utf8_string(patch());
320 // (could use java_lang_String::as_symbol instead, but might as well batch them)
321 utf8_buffer = (const u1*) str;
322 utf8_length = (u2) strlen(str);
323 }
324
325 unsigned int hash;
326 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
327 utf8_length,
328 hash);
329 if (result == NULL) {
330 names[names_count] = (const char*)utf8_buffer;
331 lengths[names_count] = utf8_length;
332 indices[names_count] = index;
333 hashValues[names_count++] = hash;
334 if (names_count == SymbolTable::symbol_alloc_batch_size) {
335 SymbolTable::new_symbols(_loader_data,
336 constantPoolHandle(THREAD, cp),
337 names_count,
338 names,
339 lengths,
340 indices,
341 hashValues);
342 names_count = 0;
343 }
344 } else {
345 cp->symbol_at_put(index, result);
346 }
347 break;
348 }
349 case JVM_CONSTANT_Module:
350 case JVM_CONSTANT_Package: {
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 constantPoolHandle(THREAD, cp),
374 names_count,
375 names,
376 lengths,
377 indices,
378 hashValues);
379 }
380
381 // Copy _current pointer of local copy back to stream.
382 assert(stream->current() == old_current, "non-exclusive use of stream");
383 stream->set_current(cfs1.current());
384
385 }
386
387 static inline bool valid_cp_range(int index, int length) {
388 return (index > 0 && index < length);
389 }
390
391 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
392 assert(cp != NULL, "invariant");
393 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
394 return cp->symbol_at(index);
395 }
396 return NULL;
397 }
398
399 #ifdef ASSERT
400 PRAGMA_DIAG_PUSH
401 PRAGMA_FORMAT_NONLITERAL_IGNORED
402 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
403 ResourceMark rm(THREAD);
404 fatal(msg, _class_name->as_C_string());
405 }
406
407 void ClassFileParser::report_assert_property_failure(const char* msg,
408 int index,
409 TRAPS) const {
410 ResourceMark rm(THREAD);
411 fatal(msg, index, _class_name->as_C_string());
412 }
413 PRAGMA_DIAG_POP
414 #endif
415
416 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
417 ConstantPool* const cp,
418 const int length,
419 TRAPS) {
420 assert(cp != NULL, "invariant");
421 assert(stream != NULL, "invariant");
422
423 // parsing constant pool entries
424 parse_constant_pool_entries(stream, cp, length, CHECK);
425 if (class_bad_constant_seen() != 0) {
426 // a bad CP entry has been detected previously so stop parsing and just return.
427 return;
428 }
429
430 int index = 1; // declared outside of loops for portability
431 int num_klasses = 0;
432
433 // first verification pass - validate cross references
434 // and fixup class and string constants
435 for (index = 1; index < length; index++) { // Index 0 is unused
436 const jbyte tag = cp->tag_at(index).value();
437 switch (tag) {
438 case JVM_CONSTANT_Class: {
439 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
440 break;
441 }
442 case JVM_CONSTANT_Fieldref:
443 // fall through
444 case JVM_CONSTANT_Methodref:
445 // fall through
446 case JVM_CONSTANT_InterfaceMethodref: {
447 if (!_need_verify) break;
448 const int klass_ref_index = cp->klass_ref_index_at(index);
449 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
450 check_property(valid_klass_reference_at(klass_ref_index),
451 "Invalid constant pool index %u in class file %s",
452 klass_ref_index, CHECK);
453 check_property(valid_cp_range(name_and_type_ref_index, length) &&
454 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
455 "Invalid constant pool index %u in class file %s",
456 name_and_type_ref_index, CHECK);
457 break;
458 }
459 case JVM_CONSTANT_String: {
460 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
461 break;
462 }
463 case JVM_CONSTANT_Integer:
464 break;
465 case JVM_CONSTANT_Float:
466 break;
467 case JVM_CONSTANT_Long:
468 case JVM_CONSTANT_Double: {
469 index++;
470 check_property(
471 (index < length && cp->tag_at(index).is_invalid()),
472 "Improper constant pool long/double index %u in class file %s",
473 index, CHECK);
474 break;
475 }
476 case JVM_CONSTANT_NameAndType: {
477 if (!_need_verify) break;
478 const int name_ref_index = cp->name_ref_index_at(index);
479 const int signature_ref_index = cp->signature_ref_index_at(index);
480 check_property(valid_symbol_at(name_ref_index),
481 "Invalid constant pool index %u in class file %s",
482 name_ref_index, CHECK);
483 check_property(valid_symbol_at(signature_ref_index),
484 "Invalid constant pool index %u in class file %s",
485 signature_ref_index, CHECK);
486 break;
487 }
488 case JVM_CONSTANT_Utf8:
489 break;
490 case JVM_CONSTANT_UnresolvedClass: // fall-through
491 case JVM_CONSTANT_UnresolvedClassInError: {
492 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
493 break;
494 }
495 case JVM_CONSTANT_ClassIndex: {
496 const int class_index = cp->klass_index_at(index);
497 check_property(valid_symbol_at(class_index),
498 "Invalid constant pool index %u in class file %s",
499 class_index, CHECK);
500 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
501 break;
502 }
503 case JVM_CONSTANT_StringIndex: {
504 const int string_index = cp->string_index_at(index);
505 check_property(valid_symbol_at(string_index),
506 "Invalid constant pool index %u in class file %s",
507 string_index, CHECK);
508 Symbol* const sym = cp->symbol_at(string_index);
509 cp->unresolved_string_at_put(index, sym);
510 break;
511 }
512 case JVM_CONSTANT_MethodHandle: {
513 const int ref_index = cp->method_handle_index_at(index);
514 check_property(valid_cp_range(ref_index, length),
515 "Invalid constant pool index %u in class file %s",
516 ref_index, CHECK);
517 const constantTag tag = cp->tag_at(ref_index);
518 const int ref_kind = cp->method_handle_ref_kind_at(index);
519
520 switch (ref_kind) {
521 case JVM_REF_getField:
522 case JVM_REF_getStatic:
523 case JVM_REF_putField:
524 case JVM_REF_putStatic: {
525 check_property(
526 tag.is_field(),
527 "Invalid constant pool index %u in class file %s (not a field)",
528 ref_index, CHECK);
529 break;
530 }
531 case JVM_REF_invokeVirtual:
532 case JVM_REF_newInvokeSpecial: {
533 check_property(
534 tag.is_method(),
535 "Invalid constant pool index %u in class file %s (not a method)",
536 ref_index, CHECK);
537 break;
538 }
539 case JVM_REF_invokeStatic:
540 case JVM_REF_invokeSpecial: {
541 check_property(
542 tag.is_method() ||
543 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
544 "Invalid constant pool index %u in class file %s (not a method)",
545 ref_index, CHECK);
546 break;
547 }
548 case JVM_REF_invokeInterface: {
549 check_property(
550 tag.is_interface_method(),
551 "Invalid constant pool index %u in class file %s (not an interface method)",
552 ref_index, CHECK);
553 break;
554 }
555 default: {
556 classfile_parse_error(
557 "Bad method handle kind at constant pool index %u in class file %s",
558 index, CHECK);
559 }
560 } // switch(refkind)
561 // Keep the ref_index unchanged. It will be indirected at link-time.
562 break;
563 } // case MethodHandle
564 case JVM_CONSTANT_MethodType: {
565 const int ref_index = cp->method_type_index_at(index);
566 check_property(valid_symbol_at(ref_index),
567 "Invalid constant pool index %u in class file %s",
568 ref_index, CHECK);
569 break;
570 }
571 case JVM_CONSTANT_Dynamic: {
572 const int name_and_type_ref_index =
573 cp->bootstrap_name_and_type_ref_index_at(index);
574
575 check_property(valid_cp_range(name_and_type_ref_index, length) &&
576 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
577 "Invalid constant pool index %u in class file %s",
578 name_and_type_ref_index, CHECK);
579 // bootstrap specifier index must be checked later,
580 // when BootstrapMethods attr is available
581
582 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
583 cp->set_has_dynamic_constant();
584 break;
585 }
586 case JVM_CONSTANT_InvokeDynamic: {
587 const int name_and_type_ref_index =
588 cp->bootstrap_name_and_type_ref_index_at(index);
589
590 check_property(valid_cp_range(name_and_type_ref_index, length) &&
591 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
592 "Invalid constant pool index %u in class file %s",
593 name_and_type_ref_index, CHECK);
594 // bootstrap specifier index must be checked later,
595 // when BootstrapMethods attr is available
596 break;
597 }
598 default: {
599 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
600 ShouldNotReachHere();
601 break;
602 }
603 } // switch(tag)
604 } // end of for
605
606 _first_patched_klass_resolved_index = num_klasses;
607 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
608
609 if (_cp_patches != NULL) {
610 // need to treat this_class specially...
611
612 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
613 // for now. These will be replaced with actual names of the patched classes in patch_class().
614 Symbol* s = vmSymbols::star_name();
615 for (int n=_orig_cp_size; n<cp->length(); n++) {
616 cp->symbol_at_put(n, s);
617 }
618
619 int this_class_index;
620 {
621 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
622 const u1* const mark = stream->current();
623 stream->skip_u2_fast(1); // skip flags
624 this_class_index = stream->get_u2_fast();
625 stream->set_current(mark); // revert to mark
626 }
627
628 for (index = 1; index < length; index++) { // Index 0 is unused
629 if (has_cp_patch_at(index)) {
630 guarantee_property(index != this_class_index,
631 "Illegal constant pool patch to self at %d in class file %s",
632 index, CHECK);
633 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
634 }
635 }
636 }
637
638 if (!_need_verify) {
639 return;
640 }
641
642 // second verification pass - checks the strings are of the right format.
643 // but not yet to the other entries
644 for (index = 1; index < length; index++) {
645 const jbyte tag = cp->tag_at(index).value();
646 switch (tag) {
647 case JVM_CONSTANT_UnresolvedClass: {
648 const Symbol* const class_name = cp->klass_name_at(index);
649 // check the name, even if _cp_patches will overwrite it
650 verify_legal_class_name(class_name, CHECK);
651 break;
652 }
653 case JVM_CONSTANT_NameAndType: {
654 if (_need_verify) {
655 const int sig_index = cp->signature_ref_index_at(index);
656 const int name_index = cp->name_ref_index_at(index);
657 const Symbol* const name = cp->symbol_at(name_index);
658 const Symbol* const sig = cp->symbol_at(sig_index);
659 guarantee_property(sig->utf8_length() != 0,
660 "Illegal zero length constant pool entry at %d in class %s",
661 sig_index, CHECK);
662 guarantee_property(name->utf8_length() != 0,
663 "Illegal zero length constant pool entry at %d in class %s",
664 name_index, CHECK);
665
666 if (sig->char_at(0) == JVM_SIGNATURE_FUNC) {
667 // Format check method name and signature
668 verify_legal_method_name(name, CHECK);
669 verify_legal_method_signature(name, sig, CHECK);
670 } else {
671 // Format check field name and signature
672 verify_legal_field_name(name, CHECK);
673 verify_legal_field_signature(name, sig, CHECK);
674 }
675 }
676 break;
677 }
678 case JVM_CONSTANT_Dynamic: {
679 const int name_and_type_ref_index =
680 cp->name_and_type_ref_index_at(index);
681 // already verified to be utf8
682 const int name_ref_index =
683 cp->name_ref_index_at(name_and_type_ref_index);
684 // already verified to be utf8
685 const int signature_ref_index =
686 cp->signature_ref_index_at(name_and_type_ref_index);
687 const Symbol* const name = cp->symbol_at(name_ref_index);
688 const Symbol* const signature = cp->symbol_at(signature_ref_index);
689 if (_need_verify) {
690 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
691 // Need only to be sure signature is non-zero length and the right type.
692 if (signature->utf8_length() == 0 ||
693 signature->char_at(0) == JVM_SIGNATURE_FUNC) {
694 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
695 }
696 }
697 break;
698 }
699 case JVM_CONSTANT_InvokeDynamic:
700 case JVM_CONSTANT_Fieldref:
701 case JVM_CONSTANT_Methodref:
702 case JVM_CONSTANT_InterfaceMethodref: {
703 const int name_and_type_ref_index =
704 cp->name_and_type_ref_index_at(index);
705 // already verified to be utf8
706 const int name_ref_index =
707 cp->name_ref_index_at(name_and_type_ref_index);
708 // already verified to be utf8
709 const int signature_ref_index =
710 cp->signature_ref_index_at(name_and_type_ref_index);
711 const Symbol* const name = cp->symbol_at(name_ref_index);
712 const Symbol* const signature = cp->symbol_at(signature_ref_index);
713 if (tag == JVM_CONSTANT_Fieldref) {
714 if (_need_verify) {
715 // Field name and signature are verified above, when iterating NameAndType_info.
716 // Need only to be sure signature is non-zero length and the right type.
717 if (signature->utf8_length() == 0 ||
718 signature->char_at(0) == JVM_SIGNATURE_FUNC) {
719 throwIllegalSignature("Field", name, signature, CHECK);
720 }
721 }
722 } else {
723 if (_need_verify) {
724 // Method name and signature are verified above, when iterating NameAndType_info.
725 // Need only to be sure signature is non-zero length and the right type.
726 if (signature->utf8_length() == 0 ||
727 signature->char_at(0) != JVM_SIGNATURE_FUNC) {
728 throwIllegalSignature("Method", name, signature, CHECK);
729 }
730 }
731 // 4509014: If a class method name begins with '<', it must be "<init>"
732 const unsigned int name_len = name->utf8_length();
733 if (tag == JVM_CONSTANT_Methodref &&
734 name_len != 0 &&
735 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
736 name != vmSymbols::object_initializer_name()) {
737 classfile_parse_error(
738 "Bad method name at constant pool index %u in class file %s",
739 name_ref_index, CHECK);
740 }
741 }
742 break;
743 }
744 case JVM_CONSTANT_MethodHandle: {
745 const int ref_index = cp->method_handle_index_at(index);
746 const int ref_kind = cp->method_handle_ref_kind_at(index);
747 switch (ref_kind) {
748 case JVM_REF_invokeVirtual:
749 case JVM_REF_invokeStatic:
750 case JVM_REF_invokeSpecial:
751 case JVM_REF_newInvokeSpecial: {
752 const int name_and_type_ref_index =
753 cp->name_and_type_ref_index_at(ref_index);
754 const int name_ref_index =
755 cp->name_ref_index_at(name_and_type_ref_index);
756 const Symbol* const name = cp->symbol_at(name_ref_index);
757 if (ref_kind == JVM_REF_newInvokeSpecial) {
758 if (name != vmSymbols::object_initializer_name()) {
759 classfile_parse_error(
760 "Bad constructor name at constant pool index %u in class file %s",
761 name_ref_index, CHECK);
762 }
763 } else {
764 if (name == vmSymbols::object_initializer_name()) {
765 classfile_parse_error(
766 "Bad method name at constant pool index %u in class file %s",
767 name_ref_index, CHECK);
768 }
769 }
770 break;
771 }
772 // Other ref_kinds are already fully checked in previous pass.
773 } // switch(ref_kind)
774 break;
775 }
776 case JVM_CONSTANT_MethodType: {
777 const Symbol* const no_name = vmSymbols::type_name(); // place holder
778 const Symbol* const signature = cp->method_type_signature_at(index);
779 verify_legal_method_signature(no_name, signature, CHECK);
780 break;
781 }
782 case JVM_CONSTANT_Utf8: {
783 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
784 }
785 } // switch(tag)
786 } // end of for
787 }
788
789 Handle ClassFileParser::clear_cp_patch_at(int index) {
790 Handle patch = cp_patch_at(index);
791 _cp_patches->at_put(index, Handle());
792 assert(!has_cp_patch_at(index), "");
793 return patch;
794 }
795
796 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
797 int name_index = _orig_cp_size + _num_patched_klasses;
798 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
799
800 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
801 _num_patched_klasses ++;
802 }
803
804 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
805 int index,
806 Handle patch,
807 TRAPS) {
808 assert(cp != NULL, "invariant");
809
810 BasicType patch_type = T_VOID;
811
812 switch (cp->tag_at(index).value()) {
813
814 case JVM_CONSTANT_UnresolvedClass: {
815 // Patching a class means pre-resolving it.
816 // The name in the constant pool is ignored.
817 if (java_lang_Class::is_instance(patch())) {
818 guarantee_property(!java_lang_Class::is_primitive(patch()),
819 "Illegal class patch at %d in class file %s",
820 index, CHECK);
821 Klass* k = java_lang_Class::as_Klass(patch());
822 patch_class(cp, index, k, k->name());
823 } else {
824 guarantee_property(java_lang_String::is_instance(patch()),
825 "Illegal class patch at %d in class file %s",
826 index, CHECK);
827 Symbol* const name = java_lang_String::as_symbol(patch());
828 patch_class(cp, index, NULL, name);
829 }
830 break;
831 }
832
833 case JVM_CONSTANT_String: {
834 // skip this patch and don't clear it. Needs the oop array for resolved
835 // references to be created first.
836 return;
837 }
838 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
839 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
840 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
841 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
842 patch_prim:
843 {
844 jvalue value;
845 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
846 guarantee_property(value_type == patch_type,
847 "Illegal primitive patch at %d in class file %s",
848 index, CHECK);
849 switch (value_type) {
850 case T_INT: cp->int_at_put(index, value.i); break;
851 case T_FLOAT: cp->float_at_put(index, value.f); break;
852 case T_LONG: cp->long_at_put(index, value.j); break;
853 case T_DOUBLE: cp->double_at_put(index, value.d); break;
854 default: assert(false, "");
855 }
856 } // end patch_prim label
857 break;
858
859 default: {
860 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
861 guarantee_property(!has_cp_patch_at(index),
862 "Illegal unexpected patch at %d in class file %s",
863 index, CHECK);
864 return;
865 }
866 } // end of switch(tag)
867
868 // On fall-through, mark the patch as used.
869 clear_cp_patch_at(index);
870 }
871 class NameSigHash: public ResourceObj {
872 public:
873 const Symbol* _name; // name
874 const Symbol* _sig; // signature
875 NameSigHash* _next; // Next entry in hash table
876 };
877
878 static const int HASH_ROW_SIZE = 256;
879
880 static unsigned int hash(const Symbol* name, const Symbol* sig) {
881 unsigned int raw_hash = 0;
882 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
883 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
884
885 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
886 }
887
888
889 static void initialize_hashtable(NameSigHash** table) {
890 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
891 }
892 // Return false if the name/sig combination is found in table.
893 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
894 // The old format checker uses heap sort to find duplicates.
895 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
896 // of table since we don't expect Symbol*'s to move.
897 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
898 assert(name != NULL, "name in constant pool is NULL");
899
900 // First lookup for duplicates
901 int index = hash(name, sig);
902 NameSigHash* entry = table[index];
903 while (entry != NULL) {
904 if (entry->_name == name && entry->_sig == sig) {
905 return false;
906 }
907 entry = entry->_next;
908 }
909
910 // No duplicate is found, allocate a new entry and fill it.
911 entry = new NameSigHash();
912 entry->_name = name;
913 entry->_sig = sig;
914
915 // Insert into hash table
916 entry->_next = table[index];
917 table[index] = entry;
918
919 return true;
920 }
921
922 // Side-effects: populates the _local_interfaces field
923 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
924 const int itfs_len,
925 ConstantPool* const cp,
926 bool* const has_nonstatic_concrete_methods,
927 TRAPS) {
928 assert(stream != NULL, "invariant");
929 assert(cp != NULL, "invariant");
930 assert(has_nonstatic_concrete_methods != NULL, "invariant");
931
932 if (itfs_len == 0) {
933 _local_interfaces = Universe::the_empty_instance_klass_array();
934 } else {
935 assert(itfs_len > 0, "only called for len>0");
936 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
937
938 int index;
939 for (index = 0; index < itfs_len; index++) {
940 const u2 interface_index = stream->get_u2(CHECK);
941 Klass* interf;
942 check_property(
943 valid_klass_reference_at(interface_index),
944 "Interface name has bad constant pool index %u in class file %s",
945 interface_index, CHECK);
946 if (cp->tag_at(interface_index).is_klass()) {
947 interf = cp->resolved_klass_at(interface_index);
948 } else {
949 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
950
951 // Don't need to check legal name because it's checked when parsing constant pool.
952 // But need to make sure it's not an array type.
953 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
954 "Bad interface name in class file %s", CHECK);
955
956 // Call resolve_super so classcircularity is checked
957 interf = SystemDictionary::resolve_super_or_fail(
958 _class_name,
959 unresolved_klass,
960 Handle(THREAD, _loader_data->class_loader()),
961 _protection_domain,
962 false,
963 CHECK);
964 }
965
966 if (!interf->is_interface()) {
967 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
968 err_msg("class %s can not implement %s, because it is not an interface (%s)",
969 _class_name->as_klass_external_name(),
970 interf->external_name(),
971 interf->class_in_module_of_loader()));
972 }
973
974 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
975 *has_nonstatic_concrete_methods = true;
976 }
977 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
978 }
979
980 if (!_need_verify || itfs_len <= 1) {
981 return;
982 }
983
984 // Check if there's any duplicates in interfaces
985 ResourceMark rm(THREAD);
986 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
987 NameSigHash*,
988 HASH_ROW_SIZE);
989 initialize_hashtable(interface_names);
990 bool dup = false;
991 const Symbol* name = NULL;
992 {
993 debug_only(NoSafepointVerifier nsv;)
994 for (index = 0; index < itfs_len; index++) {
995 const InstanceKlass* const k = _local_interfaces->at(index);
996 name = k->name();
997 // If no duplicates, add (name, NULL) in hashtable interface_names.
998 if (!put_after_lookup(name, NULL, interface_names)) {
999 dup = true;
1000 break;
1001 }
1002 }
1003 }
1004 if (dup) {
1005 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
1006 name->as_C_string(), CHECK);
1007 }
1008 }
1009 }
1010
1011 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
1012 int constantvalue_index,
1013 int signature_index,
1014 TRAPS) const {
1015 // Make sure the constant pool entry is of a type appropriate to this field
1016 guarantee_property(
1017 (constantvalue_index > 0 &&
1018 constantvalue_index < cp->length()),
1019 "Bad initial value index %u in ConstantValue attribute in class file %s",
1020 constantvalue_index, CHECK);
1021
1022 const constantTag value_type = cp->tag_at(constantvalue_index);
1023 switch(cp->basic_type_for_signature_at(signature_index)) {
1024 case T_LONG: {
1025 guarantee_property(value_type.is_long(),
1026 "Inconsistent constant value type in class file %s",
1027 CHECK);
1028 break;
1029 }
1030 case T_FLOAT: {
1031 guarantee_property(value_type.is_float(),
1032 "Inconsistent constant value type in class file %s",
1033 CHECK);
1034 break;
1035 }
1036 case T_DOUBLE: {
1037 guarantee_property(value_type.is_double(),
1038 "Inconsistent constant value type in class file %s",
1039 CHECK);
1040 break;
1041 }
1042 case T_BYTE:
1043 case T_CHAR:
1044 case T_SHORT:
1045 case T_BOOLEAN:
1046 case T_INT: {
1047 guarantee_property(value_type.is_int(),
1048 "Inconsistent constant value type in class file %s",
1049 CHECK);
1050 break;
1051 }
1052 case T_OBJECT: {
1053 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1054 && value_type.is_string()),
1055 "Bad string initial value in class file %s",
1056 CHECK);
1057 break;
1058 }
1059 default: {
1060 classfile_parse_error("Unable to set initial value %u in class file %s",
1061 constantvalue_index,
1062 CHECK);
1063 }
1064 }
1065 }
1066
1067 class AnnotationCollector : public ResourceObj{
1068 public:
1069 enum Location { _in_field, _in_method, _in_class };
1070 enum ID {
1071 _unknown = 0,
1072 _method_CallerSensitive,
1073 _method_ForceInline,
1074 _method_DontInline,
1075 _method_InjectedProfile,
1076 _method_LambdaForm_Compiled,
1077 _method_Hidden,
1078 _method_HotSpotIntrinsicCandidate,
1079 _jdk_internal_vm_annotation_Contended,
1080 _field_Stable,
1081 _jdk_internal_vm_annotation_ReservedStackAccess,
1082 _annotation_LIMIT
1083 };
1084 const Location _location;
1085 int _annotations_present;
1086 u2 _contended_group;
1087
1088 AnnotationCollector(Location location)
1089 : _location(location), _annotations_present(0)
1090 {
1091 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1092 }
1093 // If this annotation name has an ID, report it (or _none).
1094 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1095 // Set the annotation name:
1096 void set_annotation(ID id) {
1097 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1098 _annotations_present |= nth_bit((int)id);
1099 }
1100
1101 void remove_annotation(ID id) {
1102 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1103 _annotations_present &= ~nth_bit((int)id);
1104 }
1105
1106 // Report if the annotation is present.
1107 bool has_any_annotations() const { return _annotations_present != 0; }
1108 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1109
1110 void set_contended_group(u2 group) { _contended_group = group; }
1111 u2 contended_group() const { return _contended_group; }
1112
1113 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1114
1115 void set_stable(bool stable) { set_annotation(_field_Stable); }
1116 bool is_stable() const { return has_annotation(_field_Stable); }
1117 };
1118
1119 // This class also doubles as a holder for metadata cleanup.
1120 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1121 private:
1122 ClassLoaderData* _loader_data;
1123 AnnotationArray* _field_annotations;
1124 AnnotationArray* _field_type_annotations;
1125 public:
1126 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1127 AnnotationCollector(_in_field),
1128 _loader_data(loader_data),
1129 _field_annotations(NULL),
1130 _field_type_annotations(NULL) {}
1131 ~FieldAnnotationCollector();
1132 void apply_to(FieldInfo* f);
1133 AnnotationArray* field_annotations() { return _field_annotations; }
1134 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1135
1136 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1137 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1138 };
1139
1140 class MethodAnnotationCollector : public AnnotationCollector{
1141 public:
1142 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1143 void apply_to(const methodHandle& m);
1144 };
1145
1146 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1147 public:
1148 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1149 void apply_to(InstanceKlass* ik);
1150 };
1151
1152
1153 static int skip_annotation_value(const u1*, int, int); // fwd decl
1154
1155 // Safely increment index by val if does not pass limit
1156 #define SAFE_ADD(index, limit, val) \
1157 if (index >= limit - val) return limit; \
1158 index += val;
1159
1160 // Skip an annotation. Return >=limit if there is any problem.
1161 static int skip_annotation(const u1* buffer, int limit, int index) {
1162 assert(buffer != NULL, "invariant");
1163 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1164 // value := switch (tag:u1) { ... }
1165 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1166 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1167 while (--nmem >= 0 && index < limit) {
1168 SAFE_ADD(index, limit, 2); // skip member
1169 index = skip_annotation_value(buffer, limit, index);
1170 }
1171 return index;
1172 }
1173
1174 // Skip an annotation value. Return >=limit if there is any problem.
1175 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1176 assert(buffer != NULL, "invariant");
1177
1178 // value := switch (tag:u1) {
1179 // case B, C, I, S, Z, D, F, J, c: con:u2;
1180 // case e: e_class:u2 e_name:u2;
1181 // case s: s_con:u2;
1182 // case [: do(nval:u2) {value};
1183 // case @: annotation;
1184 // case s: s_con:u2;
1185 // }
1186 SAFE_ADD(index, limit, 1); // read tag
1187 const u1 tag = buffer[index - 1];
1188 switch (tag) {
1189 case 'B':
1190 case 'C':
1191 case 'I':
1192 case 'S':
1193 case 'Z':
1194 case 'D':
1195 case 'F':
1196 case 'J':
1197 case 'c':
1198 case 's':
1199 SAFE_ADD(index, limit, 2); // skip con or s_con
1200 break;
1201 case 'e':
1202 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1203 break;
1204 case '[':
1205 {
1206 SAFE_ADD(index, limit, 2); // read nval
1207 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1208 while (--nval >= 0 && index < limit) {
1209 index = skip_annotation_value(buffer, limit, index);
1210 }
1211 }
1212 break;
1213 case '@':
1214 index = skip_annotation(buffer, limit, index);
1215 break;
1216 default:
1217 return limit; // bad tag byte
1218 }
1219 return index;
1220 }
1221
1222 // Sift through annotations, looking for those significant to the VM:
1223 static void parse_annotations(const ConstantPool* const cp,
1224 const u1* buffer, int limit,
1225 AnnotationCollector* coll,
1226 ClassLoaderData* loader_data,
1227 TRAPS) {
1228
1229 assert(cp != NULL, "invariant");
1230 assert(buffer != NULL, "invariant");
1231 assert(coll != NULL, "invariant");
1232 assert(loader_data != NULL, "invariant");
1233
1234 // annotations := do(nann:u2) {annotation}
1235 int index = 2; // read nann
1236 if (index >= limit) return;
1237 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1238 enum { // initial annotation layout
1239 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1240 count_off = 2, // u2 such as 1 (one value)
1241 member_off = 4, // utf8 such as 'value'
1242 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1243 e_tag_val = 'e',
1244 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1245 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1246 e_size = 11, // end of 'e' annotation
1247 c_tag_val = 'c', // payload is type
1248 c_con_off = 7, // utf8 payload, such as 'I'
1249 c_size = 9, // end of 'c' annotation
1250 s_tag_val = 's', // payload is String
1251 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1252 s_size = 9,
1253 min_size = 6 // smallest possible size (zero members)
1254 };
1255 // Cannot add min_size to index in case of overflow MAX_INT
1256 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1257 int index0 = index;
1258 index = skip_annotation(buffer, limit, index);
1259 const u1* const abase = buffer + index0;
1260 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1261 const int count = Bytes::get_Java_u2((address)abase + count_off);
1262 const Symbol* const aname = check_symbol_at(cp, atype);
1263 if (aname == NULL) break; // invalid annotation name
1264 const Symbol* member = NULL;
1265 if (count >= 1) {
1266 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1267 member = check_symbol_at(cp, member_index);
1268 if (member == NULL) break; // invalid member name
1269 }
1270
1271 // Here is where parsing particular annotations will take place.
1272 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1273 if (AnnotationCollector::_unknown == id) continue;
1274 coll->set_annotation(id);
1275
1276 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1277 // @Contended can optionally specify the contention group.
1278 //
1279 // Contended group defines the equivalence class over the fields:
1280 // the fields within the same contended group are not treated distinct.
1281 // The only exception is default group, which does not incur the
1282 // equivalence. Naturally, contention group for classes is meaningless.
1283 //
1284 // While the contention group is specified as String, annotation
1285 // values are already interned, and we might as well use the constant
1286 // pool index as the group tag.
1287 //
1288 u2 group_index = 0; // default contended group
1289 if (count == 1
1290 && s_size == (index - index0) // match size
1291 && s_tag_val == *(abase + tag_off)
1292 && member == vmSymbols::value_name()) {
1293 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1294 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1295 group_index = 0; // default contended group
1296 }
1297 }
1298 coll->set_contended_group(group_index);
1299 }
1300 }
1301 }
1302
1303
1304 // Parse attributes for a field.
1305 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1306 u2 attributes_count,
1307 bool is_static, u2 signature_index,
1308 u2* const constantvalue_index_addr,
1309 bool* const is_synthetic_addr,
1310 u2* const generic_signature_index_addr,
1311 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1312 TRAPS) {
1313 assert(cfs != NULL, "invariant");
1314 assert(constantvalue_index_addr != NULL, "invariant");
1315 assert(is_synthetic_addr != NULL, "invariant");
1316 assert(generic_signature_index_addr != NULL, "invariant");
1317 assert(parsed_annotations != NULL, "invariant");
1318 assert(attributes_count > 0, "attributes_count should be greater than 0");
1319
1320 u2 constantvalue_index = 0;
1321 u2 generic_signature_index = 0;
1322 bool is_synthetic = false;
1323 const u1* runtime_visible_annotations = NULL;
1324 int runtime_visible_annotations_length = 0;
1325 const u1* runtime_invisible_annotations = NULL;
1326 int runtime_invisible_annotations_length = 0;
1327 const u1* runtime_visible_type_annotations = NULL;
1328 int runtime_visible_type_annotations_length = 0;
1329 const u1* runtime_invisible_type_annotations = NULL;
1330 int runtime_invisible_type_annotations_length = 0;
1331 bool runtime_invisible_annotations_exists = false;
1332 bool runtime_invisible_type_annotations_exists = false;
1333 const ConstantPool* const cp = _cp;
1334
1335 while (attributes_count--) {
1336 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1337 const u2 attribute_name_index = cfs->get_u2_fast();
1338 const u4 attribute_length = cfs->get_u4_fast();
1339 check_property(valid_symbol_at(attribute_name_index),
1340 "Invalid field attribute index %u in class file %s",
1341 attribute_name_index,
1342 CHECK);
1343
1344 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1345 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1346 // ignore if non-static
1347 if (constantvalue_index != 0) {
1348 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1349 }
1350 check_property(
1351 attribute_length == 2,
1352 "Invalid ConstantValue field attribute length %u in class file %s",
1353 attribute_length, CHECK);
1354
1355 constantvalue_index = cfs->get_u2(CHECK);
1356 if (_need_verify) {
1357 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1358 }
1359 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1360 if (attribute_length != 0) {
1361 classfile_parse_error(
1362 "Invalid Synthetic field attribute length %u in class file %s",
1363 attribute_length, CHECK);
1364 }
1365 is_synthetic = true;
1366 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1367 if (attribute_length != 0) {
1368 classfile_parse_error(
1369 "Invalid Deprecated field attribute length %u in class file %s",
1370 attribute_length, CHECK);
1371 }
1372 } else if (_major_version >= JAVA_1_5_VERSION) {
1373 if (attribute_name == vmSymbols::tag_signature()) {
1374 if (generic_signature_index != 0) {
1375 classfile_parse_error(
1376 "Multiple Signature attributes for field in class file %s", CHECK);
1377 }
1378 if (attribute_length != 2) {
1379 classfile_parse_error(
1380 "Wrong size %u for field's Signature attribute in class file %s",
1381 attribute_length, CHECK);
1382 }
1383 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1384 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1385 if (runtime_visible_annotations != NULL) {
1386 classfile_parse_error(
1387 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1388 }
1389 runtime_visible_annotations_length = attribute_length;
1390 runtime_visible_annotations = cfs->current();
1391 assert(runtime_visible_annotations != NULL, "null visible annotations");
1392 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1393 parse_annotations(cp,
1394 runtime_visible_annotations,
1395 runtime_visible_annotations_length,
1396 parsed_annotations,
1397 _loader_data,
1398 CHECK);
1399 cfs->skip_u1_fast(runtime_visible_annotations_length);
1400 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1401 if (runtime_invisible_annotations_exists) {
1402 classfile_parse_error(
1403 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1404 }
1405 runtime_invisible_annotations_exists = true;
1406 if (PreserveAllAnnotations) {
1407 runtime_invisible_annotations_length = attribute_length;
1408 runtime_invisible_annotations = cfs->current();
1409 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1410 }
1411 cfs->skip_u1(attribute_length, CHECK);
1412 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1413 if (runtime_visible_type_annotations != NULL) {
1414 classfile_parse_error(
1415 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1416 }
1417 runtime_visible_type_annotations_length = attribute_length;
1418 runtime_visible_type_annotations = cfs->current();
1419 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1420 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1421 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1422 if (runtime_invisible_type_annotations_exists) {
1423 classfile_parse_error(
1424 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1425 } else {
1426 runtime_invisible_type_annotations_exists = true;
1427 }
1428 if (PreserveAllAnnotations) {
1429 runtime_invisible_type_annotations_length = attribute_length;
1430 runtime_invisible_type_annotations = cfs->current();
1431 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1432 }
1433 cfs->skip_u1(attribute_length, CHECK);
1434 } else {
1435 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1436 }
1437 } else {
1438 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1439 }
1440 }
1441
1442 *constantvalue_index_addr = constantvalue_index;
1443 *is_synthetic_addr = is_synthetic;
1444 *generic_signature_index_addr = generic_signature_index;
1445 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1446 runtime_visible_annotations_length,
1447 runtime_invisible_annotations,
1448 runtime_invisible_annotations_length,
1449 CHECK);
1450 parsed_annotations->set_field_annotations(a);
1451 a = assemble_annotations(runtime_visible_type_annotations,
1452 runtime_visible_type_annotations_length,
1453 runtime_invisible_type_annotations,
1454 runtime_invisible_type_annotations_length,
1455 CHECK);
1456 parsed_annotations->set_field_type_annotations(a);
1457 return;
1458 }
1459
1460
1461 // Field allocation types. Used for computing field offsets.
1462
1463 enum FieldAllocationType {
1464 STATIC_OOP, // Oops
1465 STATIC_BYTE, // Boolean, Byte, char
1466 STATIC_SHORT, // shorts
1467 STATIC_WORD, // ints
1468 STATIC_DOUBLE, // aligned long or double
1469 NONSTATIC_OOP,
1470 NONSTATIC_BYTE,
1471 NONSTATIC_SHORT,
1472 NONSTATIC_WORD,
1473 NONSTATIC_DOUBLE,
1474 MAX_FIELD_ALLOCATION_TYPE,
1475 BAD_ALLOCATION_TYPE = -1
1476 };
1477
1478 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1479 BAD_ALLOCATION_TYPE, // 0
1480 BAD_ALLOCATION_TYPE, // 1
1481 BAD_ALLOCATION_TYPE, // 2
1482 BAD_ALLOCATION_TYPE, // 3
1483 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1484 NONSTATIC_SHORT, // T_CHAR = 5,
1485 NONSTATIC_WORD, // T_FLOAT = 6,
1486 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1487 NONSTATIC_BYTE, // T_BYTE = 8,
1488 NONSTATIC_SHORT, // T_SHORT = 9,
1489 NONSTATIC_WORD, // T_INT = 10,
1490 NONSTATIC_DOUBLE, // T_LONG = 11,
1491 NONSTATIC_OOP, // T_OBJECT = 12,
1492 NONSTATIC_OOP, // T_ARRAY = 13,
1493 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1494 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1495 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1496 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1497 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1498 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1499 BAD_ALLOCATION_TYPE, // 0
1500 BAD_ALLOCATION_TYPE, // 1
1501 BAD_ALLOCATION_TYPE, // 2
1502 BAD_ALLOCATION_TYPE, // 3
1503 STATIC_BYTE , // T_BOOLEAN = 4,
1504 STATIC_SHORT, // T_CHAR = 5,
1505 STATIC_WORD, // T_FLOAT = 6,
1506 STATIC_DOUBLE, // T_DOUBLE = 7,
1507 STATIC_BYTE, // T_BYTE = 8,
1508 STATIC_SHORT, // T_SHORT = 9,
1509 STATIC_WORD, // T_INT = 10,
1510 STATIC_DOUBLE, // T_LONG = 11,
1511 STATIC_OOP, // T_OBJECT = 12,
1512 STATIC_OOP, // T_ARRAY = 13,
1513 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1514 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1515 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1516 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1517 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1518 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1519 };
1520
1521 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1522 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1523 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1524 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1525 return result;
1526 }
1527
1528 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1529 public:
1530 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1531
1532 FieldAllocationCount() {
1533 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1534 count[i] = 0;
1535 }
1536 }
1537
1538 FieldAllocationType update(bool is_static, BasicType type) {
1539 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1540 if (atype != BAD_ALLOCATION_TYPE) {
1541 // Make sure there is no overflow with injected fields.
1542 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1543 count[atype]++;
1544 }
1545 return atype;
1546 }
1547 };
1548
1549 // Side-effects: populates the _fields, _fields_annotations,
1550 // _fields_type_annotations fields
1551 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1552 bool is_interface,
1553 FieldAllocationCount* const fac,
1554 ConstantPool* cp,
1555 const int cp_size,
1556 u2* const java_fields_count_ptr,
1557 TRAPS) {
1558
1559 assert(cfs != NULL, "invariant");
1560 assert(fac != NULL, "invariant");
1561 assert(cp != NULL, "invariant");
1562 assert(java_fields_count_ptr != NULL, "invariant");
1563
1564 assert(NULL == _fields, "invariant");
1565 assert(NULL == _fields_annotations, "invariant");
1566 assert(NULL == _fields_type_annotations, "invariant");
1567
1568 cfs->guarantee_more(2, CHECK); // length
1569 const u2 length = cfs->get_u2_fast();
1570 *java_fields_count_ptr = length;
1571
1572 int num_injected = 0;
1573 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1574 &num_injected);
1575 const int total_fields = length + num_injected;
1576
1577 // The field array starts with tuples of shorts
1578 // [access, name index, sig index, initial value index, byte offset].
1579 // A generic signature slot only exists for field with generic
1580 // signature attribute. And the access flag is set with
1581 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1582 // signature slots are at the end of the field array and after all
1583 // other fields data.
1584 //
1585 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1586 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1587 // ...
1588 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1589 // [generic signature index]
1590 // [generic signature index]
1591 // ...
1592 //
1593 // Allocate a temporary resource array for field data. For each field,
1594 // a slot is reserved in the temporary array for the generic signature
1595 // index. After parsing all fields, the data are copied to a permanent
1596 // array and any unused slots will be discarded.
1597 ResourceMark rm(THREAD);
1598 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1599 u2,
1600 total_fields * (FieldInfo::field_slots + 1));
1601
1602 // The generic signature slots start after all other fields' data.
1603 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1604 int num_generic_signature = 0;
1605 for (int n = 0; n < length; n++) {
1606 // access_flags, name_index, descriptor_index, attributes_count
1607 cfs->guarantee_more(8, CHECK);
1608
1609 AccessFlags access_flags;
1610 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1611 verify_legal_field_modifiers(flags, is_interface, CHECK);
1612 access_flags.set_flags(flags);
1613
1614 const u2 name_index = cfs->get_u2_fast();
1615 check_property(valid_symbol_at(name_index),
1616 "Invalid constant pool index %u for field name in class file %s",
1617 name_index, CHECK);
1618 const Symbol* const name = cp->symbol_at(name_index);
1619 verify_legal_field_name(name, CHECK);
1620
1621 const u2 signature_index = cfs->get_u2_fast();
1622 check_property(valid_symbol_at(signature_index),
1623 "Invalid constant pool index %u for field signature in class file %s",
1624 signature_index, CHECK);
1625 const Symbol* const sig = cp->symbol_at(signature_index);
1626 verify_legal_field_signature(name, sig, CHECK);
1627
1628 u2 constantvalue_index = 0;
1629 bool is_synthetic = false;
1630 u2 generic_signature_index = 0;
1631 const bool is_static = access_flags.is_static();
1632 FieldAnnotationCollector parsed_annotations(_loader_data);
1633
1634 const u2 attributes_count = cfs->get_u2_fast();
1635 if (attributes_count > 0) {
1636 parse_field_attributes(cfs,
1637 attributes_count,
1638 is_static,
1639 signature_index,
1640 &constantvalue_index,
1641 &is_synthetic,
1642 &generic_signature_index,
1643 &parsed_annotations,
1644 CHECK);
1645
1646 if (parsed_annotations.field_annotations() != NULL) {
1647 if (_fields_annotations == NULL) {
1648 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1649 _loader_data, length, NULL,
1650 CHECK);
1651 }
1652 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1653 parsed_annotations.set_field_annotations(NULL);
1654 }
1655 if (parsed_annotations.field_type_annotations() != NULL) {
1656 if (_fields_type_annotations == NULL) {
1657 _fields_type_annotations =
1658 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1659 length,
1660 NULL,
1661 CHECK);
1662 }
1663 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1664 parsed_annotations.set_field_type_annotations(NULL);
1665 }
1666
1667 if (is_synthetic) {
1668 access_flags.set_is_synthetic();
1669 }
1670 if (generic_signature_index != 0) {
1671 access_flags.set_field_has_generic_signature();
1672 fa[generic_signature_slot] = generic_signature_index;
1673 generic_signature_slot ++;
1674 num_generic_signature ++;
1675 }
1676 }
1677
1678 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1679 field->initialize(access_flags.as_short(),
1680 name_index,
1681 signature_index,
1682 constantvalue_index);
1683 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1684
1685 // Remember how many oops we encountered and compute allocation type
1686 const FieldAllocationType atype = fac->update(is_static, type);
1687 field->set_allocation_type(atype);
1688
1689 // After field is initialized with type, we can augment it with aux info
1690 if (parsed_annotations.has_any_annotations())
1691 parsed_annotations.apply_to(field);
1692 }
1693
1694 int index = length;
1695 if (num_injected != 0) {
1696 for (int n = 0; n < num_injected; n++) {
1697 // Check for duplicates
1698 if (injected[n].may_be_java) {
1699 const Symbol* const name = injected[n].name();
1700 const Symbol* const signature = injected[n].signature();
1701 bool duplicate = false;
1702 for (int i = 0; i < length; i++) {
1703 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1704 if (name == cp->symbol_at(f->name_index()) &&
1705 signature == cp->symbol_at(f->signature_index())) {
1706 // Symbol is desclared in Java so skip this one
1707 duplicate = true;
1708 break;
1709 }
1710 }
1711 if (duplicate) {
1712 // These will be removed from the field array at the end
1713 continue;
1714 }
1715 }
1716
1717 // Injected field
1718 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1719 field->initialize(JVM_ACC_FIELD_INTERNAL,
1720 injected[n].name_index,
1721 injected[n].signature_index,
1722 0);
1723
1724 const BasicType type = FieldType::basic_type(injected[n].signature());
1725
1726 // Remember how many oops we encountered and compute allocation type
1727 const FieldAllocationType atype = fac->update(false, type);
1728 field->set_allocation_type(atype);
1729 index++;
1730 }
1731 }
1732
1733 assert(NULL == _fields, "invariant");
1734
1735 _fields =
1736 MetadataFactory::new_array<u2>(_loader_data,
1737 index * FieldInfo::field_slots + num_generic_signature,
1738 CHECK);
1739 // Sometimes injected fields already exist in the Java source so
1740 // the fields array could be too long. In that case the
1741 // fields array is trimed. Also unused slots that were reserved
1742 // for generic signature indexes are discarded.
1743 {
1744 int i = 0;
1745 for (; i < index * FieldInfo::field_slots; i++) {
1746 _fields->at_put(i, fa[i]);
1747 }
1748 for (int j = total_fields * FieldInfo::field_slots;
1749 j < generic_signature_slot; j++) {
1750 _fields->at_put(i++, fa[j]);
1751 }
1752 assert(_fields->length() == i, "");
1753 }
1754
1755 if (_need_verify && length > 1) {
1756 // Check duplicated fields
1757 ResourceMark rm(THREAD);
1758 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1759 THREAD, NameSigHash*, HASH_ROW_SIZE);
1760 initialize_hashtable(names_and_sigs);
1761 bool dup = false;
1762 const Symbol* name = NULL;
1763 const Symbol* sig = NULL;
1764 {
1765 debug_only(NoSafepointVerifier nsv;)
1766 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1767 name = fs.name();
1768 sig = fs.signature();
1769 // If no duplicates, add name/signature in hashtable names_and_sigs.
1770 if (!put_after_lookup(name, sig, names_and_sigs)) {
1771 dup = true;
1772 break;
1773 }
1774 }
1775 }
1776 if (dup) {
1777 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1778 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1779 }
1780 }
1781 }
1782
1783
1784 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1785 u4 code_length,
1786 u4 exception_table_length,
1787 TRAPS) {
1788 assert(cfs != NULL, "invariant");
1789
1790 const unsafe_u2* const exception_table_start = cfs->current();
1791 assert(exception_table_start != NULL, "null exception table");
1792
1793 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1794 // end_pc,
1795 // handler_pc,
1796 // catch_type_index
1797
1798 // Will check legal target after parsing code array in verifier.
1799 if (_need_verify) {
1800 for (unsigned int i = 0; i < exception_table_length; i++) {
1801 const u2 start_pc = cfs->get_u2_fast();
1802 const u2 end_pc = cfs->get_u2_fast();
1803 const u2 handler_pc = cfs->get_u2_fast();
1804 const u2 catch_type_index = cfs->get_u2_fast();
1805 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1806 "Illegal exception table range in class file %s",
1807 CHECK_NULL);
1808 guarantee_property(handler_pc < code_length,
1809 "Illegal exception table handler in class file %s",
1810 CHECK_NULL);
1811 if (catch_type_index != 0) {
1812 guarantee_property(valid_klass_reference_at(catch_type_index),
1813 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1814 }
1815 }
1816 } else {
1817 cfs->skip_u2_fast(exception_table_length * 4);
1818 }
1819 return exception_table_start;
1820 }
1821
1822 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1823 u4 code_length,
1824 CompressedLineNumberWriteStream**const write_stream,
1825 TRAPS) {
1826
1827 const ClassFileStream* const cfs = _stream;
1828 unsigned int num_entries = cfs->get_u2(CHECK);
1829
1830 // Each entry is a u2 start_pc, and a u2 line_number
1831 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1832
1833 // Verify line number attribute and table length
1834 check_property(
1835 code_attribute_length == sizeof(u2) + length_in_bytes,
1836 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1837
1838 cfs->guarantee_more(length_in_bytes, CHECK);
1839
1840 if ((*write_stream) == NULL) {
1841 if (length_in_bytes > fixed_buffer_size) {
1842 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1843 } else {
1844 (*write_stream) = new CompressedLineNumberWriteStream(
1845 _linenumbertable_buffer, fixed_buffer_size);
1846 }
1847 }
1848
1849 while (num_entries-- > 0) {
1850 const u2 bci = cfs->get_u2_fast(); // start_pc
1851 const u2 line = cfs->get_u2_fast(); // line_number
1852 guarantee_property(bci < code_length,
1853 "Invalid pc in LineNumberTable in class file %s", CHECK);
1854 (*write_stream)->write_pair(bci, line);
1855 }
1856 }
1857
1858
1859 class LVT_Hash : public AllStatic {
1860 public:
1861
1862 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1863 /*
1864 * 3-tuple start_bci/length/slot has to be unique key,
1865 * so the following comparison seems to be redundant:
1866 * && elem->name_cp_index == entry->_elem->name_cp_index
1867 */
1868 return (e0.start_bci == e1.start_bci &&
1869 e0.length == e1.length &&
1870 e0.name_cp_index == e1.name_cp_index &&
1871 e0.slot == e1.slot);
1872 }
1873
1874 static unsigned int hash(LocalVariableTableElement const& e0) {
1875 unsigned int raw_hash = e0.start_bci;
1876
1877 raw_hash = e0.length + raw_hash * 37;
1878 raw_hash = e0.name_cp_index + raw_hash * 37;
1879 raw_hash = e0.slot + raw_hash * 37;
1880
1881 return raw_hash;
1882 }
1883 };
1884
1885
1886 // Class file LocalVariableTable elements.
1887 class Classfile_LVT_Element {
1888 public:
1889 u2 start_bci;
1890 u2 length;
1891 u2 name_cp_index;
1892 u2 descriptor_cp_index;
1893 u2 slot;
1894 };
1895
1896 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1897 LocalVariableTableElement* const lvt) {
1898 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1899 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1900 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1901 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1902 lvt->signature_cp_index = 0;
1903 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1904 }
1905
1906 // Function is used to parse both attributes:
1907 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1908 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1909 u4 code_length,
1910 u2 max_locals,
1911 u4 code_attribute_length,
1912 u2* const localvariable_table_length,
1913 bool isLVTT,
1914 TRAPS) {
1915 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1916 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1917 const unsigned int size =
1918 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1919
1920 const ConstantPool* const cp = _cp;
1921
1922 // Verify local variable table attribute has right length
1923 if (_need_verify) {
1924 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1925 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1926 }
1927
1928 const unsafe_u2* const localvariable_table_start = cfs->current();
1929 assert(localvariable_table_start != NULL, "null local variable table");
1930 if (!_need_verify) {
1931 cfs->skip_u2_fast(size);
1932 } else {
1933 cfs->guarantee_more(size * 2, CHECK_NULL);
1934 for(int i = 0; i < (*localvariable_table_length); i++) {
1935 const u2 start_pc = cfs->get_u2_fast();
1936 const u2 length = cfs->get_u2_fast();
1937 const u2 name_index = cfs->get_u2_fast();
1938 const u2 descriptor_index = cfs->get_u2_fast();
1939 const u2 index = cfs->get_u2_fast();
1940 // Assign to a u4 to avoid overflow
1941 const u4 end_pc = (u4)start_pc + (u4)length;
1942
1943 if (start_pc >= code_length) {
1944 classfile_parse_error(
1945 "Invalid start_pc %u in %s in class file %s",
1946 start_pc, tbl_name, CHECK_NULL);
1947 }
1948 if (end_pc > code_length) {
1949 classfile_parse_error(
1950 "Invalid length %u in %s in class file %s",
1951 length, tbl_name, CHECK_NULL);
1952 }
1953 const int cp_size = cp->length();
1954 guarantee_property(valid_symbol_at(name_index),
1955 "Name index %u in %s has bad constant type in class file %s",
1956 name_index, tbl_name, CHECK_NULL);
1957 guarantee_property(valid_symbol_at(descriptor_index),
1958 "Signature index %u in %s has bad constant type in class file %s",
1959 descriptor_index, tbl_name, CHECK_NULL);
1960
1961 const Symbol* const name = cp->symbol_at(name_index);
1962 const Symbol* const sig = cp->symbol_at(descriptor_index);
1963 verify_legal_field_name(name, CHECK_NULL);
1964 u2 extra_slot = 0;
1965 if (!isLVTT) {
1966 verify_legal_field_signature(name, sig, CHECK_NULL);
1967
1968 // 4894874: check special cases for double and long local variables
1969 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1970 sig == vmSymbols::type_signature(T_LONG)) {
1971 extra_slot = 1;
1972 }
1973 }
1974 guarantee_property((index + extra_slot) < max_locals,
1975 "Invalid index %u in %s in class file %s",
1976 index, tbl_name, CHECK_NULL);
1977 }
1978 }
1979 return localvariable_table_start;
1980 }
1981
1982 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1983 u4 code_attribute_length,
1984 bool need_verify,
1985 TRAPS) {
1986 assert(cfs != NULL, "invariant");
1987
1988 if (0 == code_attribute_length) {
1989 return NULL;
1990 }
1991
1992 const u1* const stackmap_table_start = cfs->current();
1993 assert(stackmap_table_start != NULL, "null stackmap table");
1994
1995 // check code_attribute_length first
1996 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1997
1998 if (!need_verify && !DumpSharedSpaces) {
1999 return NULL;
2000 }
2001 return stackmap_table_start;
2002 }
2003
2004 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2005 u2* const checked_exceptions_length,
2006 u4 method_attribute_length,
2007 TRAPS) {
2008 assert(cfs != NULL, "invariant");
2009 assert(checked_exceptions_length != NULL, "invariant");
2010
2011 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2012 *checked_exceptions_length = cfs->get_u2_fast();
2013 const unsigned int size =
2014 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2015 const unsafe_u2* const checked_exceptions_start = cfs->current();
2016 assert(checked_exceptions_start != NULL, "null checked exceptions");
2017 if (!_need_verify) {
2018 cfs->skip_u2_fast(size);
2019 } else {
2020 // Verify each value in the checked exception table
2021 u2 checked_exception;
2022 const u2 len = *checked_exceptions_length;
2023 cfs->guarantee_more(2 * len, CHECK_NULL);
2024 for (int i = 0; i < len; i++) {
2025 checked_exception = cfs->get_u2_fast();
2026 check_property(
2027 valid_klass_reference_at(checked_exception),
2028 "Exception name has bad type at constant pool %u in class file %s",
2029 checked_exception, CHECK_NULL);
2030 }
2031 }
2032 // check exceptions attribute length
2033 if (_need_verify) {
2034 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2035 sizeof(u2) * size),
2036 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2037 }
2038 return checked_exceptions_start;
2039 }
2040
2041 void ClassFileParser::throwIllegalSignature(const char* type,
2042 const Symbol* name,
2043 const Symbol* sig,
2044 TRAPS) const {
2045 assert(name != NULL, "invariant");
2046 assert(sig != NULL, "invariant");
2047
2048 ResourceMark rm(THREAD);
2049 Exceptions::fthrow(THREAD_AND_LOCATION,
2050 vmSymbols::java_lang_ClassFormatError(),
2051 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2052 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2053 }
2054
2055 AnnotationCollector::ID
2056 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2057 const Symbol* name) {
2058 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2059 // Privileged code can use all annotations. Other code silently drops some.
2060 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2061 loader_data->is_platform_class_loader_data() ||
2062 loader_data->is_unsafe_anonymous();
2063 switch (sid) {
2064 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2065 if (_location != _in_method) break; // only allow for methods
2066 if (!privileged) break; // only allow in privileged code
2067 return _method_CallerSensitive;
2068 }
2069 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2070 if (_location != _in_method) break; // only allow for methods
2071 if (!privileged) break; // only allow in privileged code
2072 return _method_ForceInline;
2073 }
2074 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2075 if (_location != _in_method) break; // only allow for methods
2076 if (!privileged) break; // only allow in privileged code
2077 return _method_DontInline;
2078 }
2079 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2080 if (_location != _in_method) break; // only allow for methods
2081 if (!privileged) break; // only allow in privileged code
2082 return _method_InjectedProfile;
2083 }
2084 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2085 if (_location != _in_method) break; // only allow for methods
2086 if (!privileged) break; // only allow in privileged code
2087 return _method_LambdaForm_Compiled;
2088 }
2089 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
2090 if (_location != _in_method) break; // only allow for methods
2091 if (!privileged) break; // only allow in privileged code
2092 return _method_Hidden;
2093 }
2094 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2095 if (_location != _in_method) break; // only allow for methods
2096 if (!privileged) break; // only allow in privileged code
2097 return _method_HotSpotIntrinsicCandidate;
2098 }
2099 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2100 if (_location != _in_field) break; // only allow for fields
2101 if (!privileged) break; // only allow in privileged code
2102 return _field_Stable;
2103 }
2104 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2105 if (_location != _in_field && _location != _in_class) {
2106 break; // only allow for fields and classes
2107 }
2108 if (!EnableContended || (RestrictContended && !privileged)) {
2109 break; // honor privileges
2110 }
2111 return _jdk_internal_vm_annotation_Contended;
2112 }
2113 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2114 if (_location != _in_method) break; // only allow for methods
2115 if (RestrictReservedStack && !privileged) break; // honor privileges
2116 return _jdk_internal_vm_annotation_ReservedStackAccess;
2117 }
2118 default: {
2119 break;
2120 }
2121 }
2122 return AnnotationCollector::_unknown;
2123 }
2124
2125 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2126 if (is_contended())
2127 f->set_contended_group(contended_group());
2128 if (is_stable())
2129 f->set_stable(true);
2130 }
2131
2132 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2133 // If there's an error deallocate metadata for field annotations
2134 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2135 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2136 }
2137
2138 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2139 if (has_annotation(_method_CallerSensitive))
2140 m->set_caller_sensitive(true);
2141 if (has_annotation(_method_ForceInline))
2142 m->set_force_inline(true);
2143 if (has_annotation(_method_DontInline))
2144 m->set_dont_inline(true);
2145 if (has_annotation(_method_InjectedProfile))
2146 m->set_has_injected_profile(true);
2147 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2148 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2149 if (has_annotation(_method_Hidden))
2150 m->set_hidden(true);
2151 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2152 m->set_intrinsic_candidate(true);
2153 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2154 m->set_has_reserved_stack_access(true);
2155 }
2156
2157 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2158 assert(ik != NULL, "invariant");
2159 ik->set_is_contended(is_contended());
2160 }
2161
2162 #define MAX_ARGS_SIZE 255
2163 #define MAX_CODE_SIZE 65535
2164 #define INITIAL_MAX_LVT_NUMBER 256
2165
2166 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2167 *
2168 * Rules for LVT's and LVTT's are:
2169 * - There can be any number of LVT's and LVTT's.
2170 * - If there are n LVT's, it is the same as if there was just
2171 * one LVT containing all the entries from the n LVT's.
2172 * - There may be no more than one LVT entry per local variable.
2173 * Two LVT entries are 'equal' if these fields are the same:
2174 * start_pc, length, name, slot
2175 * - There may be no more than one LVTT entry per each LVT entry.
2176 * Each LVTT entry has to match some LVT entry.
2177 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2178 */
2179 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2180 int lvt_cnt,
2181 u2* const localvariable_table_length,
2182 const unsafe_u2** const localvariable_table_start,
2183 int lvtt_cnt,
2184 u2* const localvariable_type_table_length,
2185 const unsafe_u2** const localvariable_type_table_start,
2186 TRAPS) {
2187
2188 ResourceMark rm(THREAD);
2189
2190 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2191 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2192
2193 LVT_HashTable* const table = new LVT_HashTable();
2194
2195 // To fill LocalVariableTable in
2196 const Classfile_LVT_Element* cf_lvt;
2197 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2198
2199 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2200 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2201 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2202 copy_lvt_element(&cf_lvt[idx], lvt);
2203 // If no duplicates, add LVT elem in hashtable.
2204 if (table->put(*lvt, lvt) == false
2205 && _need_verify
2206 && _major_version >= JAVA_1_5_VERSION) {
2207 classfile_parse_error("Duplicated LocalVariableTable attribute "
2208 "entry for '%s' in class file %s",
2209 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2210 CHECK);
2211 }
2212 }
2213 }
2214
2215 // To merge LocalVariableTable and LocalVariableTypeTable
2216 const Classfile_LVT_Element* cf_lvtt;
2217 LocalVariableTableElement lvtt_elem;
2218
2219 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2220 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2221 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2222 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2223 LocalVariableTableElement** entry = table->get(lvtt_elem);
2224 if (entry == NULL) {
2225 if (_need_verify) {
2226 classfile_parse_error("LVTT entry for '%s' in class file %s "
2227 "does not match any LVT entry",
2228 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2229 CHECK);
2230 }
2231 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2232 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2233 "entry for '%s' in class file %s",
2234 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2235 CHECK);
2236 } else {
2237 // to add generic signatures into LocalVariableTable
2238 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2239 }
2240 }
2241 }
2242 }
2243
2244
2245 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2246 const u1* runtime_visible_annotations,
2247 int runtime_visible_annotations_length,
2248 const u1* runtime_invisible_annotations,
2249 int runtime_invisible_annotations_length,
2250 const u1* runtime_visible_parameter_annotations,
2251 int runtime_visible_parameter_annotations_length,
2252 const u1* runtime_invisible_parameter_annotations,
2253 int runtime_invisible_parameter_annotations_length,
2254 const u1* runtime_visible_type_annotations,
2255 int runtime_visible_type_annotations_length,
2256 const u1* runtime_invisible_type_annotations,
2257 int runtime_invisible_type_annotations_length,
2258 const u1* annotation_default,
2259 int annotation_default_length,
2260 TRAPS) {
2261
2262 AnnotationArray* a;
2263
2264 if (runtime_visible_annotations_length +
2265 runtime_invisible_annotations_length > 0) {
2266 a = assemble_annotations(runtime_visible_annotations,
2267 runtime_visible_annotations_length,
2268 runtime_invisible_annotations,
2269 runtime_invisible_annotations_length,
2270 CHECK);
2271 cm->set_method_annotations(a);
2272 }
2273
2274 if (runtime_visible_parameter_annotations_length +
2275 runtime_invisible_parameter_annotations_length > 0) {
2276 a = assemble_annotations(runtime_visible_parameter_annotations,
2277 runtime_visible_parameter_annotations_length,
2278 runtime_invisible_parameter_annotations,
2279 runtime_invisible_parameter_annotations_length,
2280 CHECK);
2281 cm->set_parameter_annotations(a);
2282 }
2283
2284 if (annotation_default_length > 0) {
2285 a = assemble_annotations(annotation_default,
2286 annotation_default_length,
2287 NULL,
2288 0,
2289 CHECK);
2290 cm->set_default_annotations(a);
2291 }
2292
2293 if (runtime_visible_type_annotations_length +
2294 runtime_invisible_type_annotations_length > 0) {
2295 a = assemble_annotations(runtime_visible_type_annotations,
2296 runtime_visible_type_annotations_length,
2297 runtime_invisible_type_annotations,
2298 runtime_invisible_type_annotations_length,
2299 CHECK);
2300 cm->set_type_annotations(a);
2301 }
2302 }
2303
2304
2305 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2306 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2307 // Method* to save footprint, so we only know the size of the resulting Method* when the
2308 // entire method attribute is parsed.
2309 //
2310 // The promoted_flags parameter is used to pass relevant access_flags
2311 // from the method back up to the containing klass. These flag values
2312 // are added to klass's access_flags.
2313
2314 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2315 bool is_interface,
2316 const ConstantPool* cp,
2317 AccessFlags* const promoted_flags,
2318 TRAPS) {
2319 assert(cfs != NULL, "invariant");
2320 assert(cp != NULL, "invariant");
2321 assert(promoted_flags != NULL, "invariant");
2322
2323 ResourceMark rm(THREAD);
2324 // Parse fixed parts:
2325 // access_flags, name_index, descriptor_index, attributes_count
2326 cfs->guarantee_more(8, CHECK_NULL);
2327
2328 int flags = cfs->get_u2_fast();
2329 const u2 name_index = cfs->get_u2_fast();
2330 const int cp_size = cp->length();
2331 check_property(
2332 valid_symbol_at(name_index),
2333 "Illegal constant pool index %u for method name in class file %s",
2334 name_index, CHECK_NULL);
2335 const Symbol* const name = cp->symbol_at(name_index);
2336 verify_legal_method_name(name, CHECK_NULL);
2337
2338 const u2 signature_index = cfs->get_u2_fast();
2339 guarantee_property(
2340 valid_symbol_at(signature_index),
2341 "Illegal constant pool index %u for method signature in class file %s",
2342 signature_index, CHECK_NULL);
2343 const Symbol* const signature = cp->symbol_at(signature_index);
2344
2345 if (name == vmSymbols::class_initializer_name()) {
2346 // We ignore the other access flags for a valid class initializer.
2347 // (JVM Spec 2nd ed., chapter 4.6)
2348 if (_major_version < 51) { // backward compatibility
2349 flags = JVM_ACC_STATIC;
2350 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2351 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2352 } else {
2353 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2354 }
2355 } else {
2356 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2357 }
2358
2359 if (name == vmSymbols::object_initializer_name() && is_interface) {
2360 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2361 }
2362
2363 int args_size = -1; // only used when _need_verify is true
2364 if (_need_verify) {
2365 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2366 verify_legal_method_signature(name, signature, CHECK_NULL);
2367 if (args_size > MAX_ARGS_SIZE) {
2368 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2369 }
2370 }
2371
2372 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2373
2374 // Default values for code and exceptions attribute elements
2375 u2 max_stack = 0;
2376 u2 max_locals = 0;
2377 u4 code_length = 0;
2378 const u1* code_start = 0;
2379 u2 exception_table_length = 0;
2380 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2381 Array<int>* exception_handlers = Universe::the_empty_int_array();
2382 u2 checked_exceptions_length = 0;
2383 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2384 CompressedLineNumberWriteStream* linenumber_table = NULL;
2385 int linenumber_table_length = 0;
2386 int total_lvt_length = 0;
2387 u2 lvt_cnt = 0;
2388 u2 lvtt_cnt = 0;
2389 bool lvt_allocated = false;
2390 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2391 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2392 u2* localvariable_table_length = NULL;
2393 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2394 u2* localvariable_type_table_length = NULL;
2395 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2396 int method_parameters_length = -1;
2397 const u1* method_parameters_data = NULL;
2398 bool method_parameters_seen = false;
2399 bool parsed_code_attribute = false;
2400 bool parsed_checked_exceptions_attribute = false;
2401 bool parsed_stackmap_attribute = false;
2402 // stackmap attribute - JDK1.5
2403 const u1* stackmap_data = NULL;
2404 int stackmap_data_length = 0;
2405 u2 generic_signature_index = 0;
2406 MethodAnnotationCollector parsed_annotations;
2407 const u1* runtime_visible_annotations = NULL;
2408 int runtime_visible_annotations_length = 0;
2409 const u1* runtime_invisible_annotations = NULL;
2410 int runtime_invisible_annotations_length = 0;
2411 const u1* runtime_visible_parameter_annotations = NULL;
2412 int runtime_visible_parameter_annotations_length = 0;
2413 const u1* runtime_invisible_parameter_annotations = NULL;
2414 int runtime_invisible_parameter_annotations_length = 0;
2415 const u1* runtime_visible_type_annotations = NULL;
2416 int runtime_visible_type_annotations_length = 0;
2417 const u1* runtime_invisible_type_annotations = NULL;
2418 int runtime_invisible_type_annotations_length = 0;
2419 bool runtime_invisible_annotations_exists = false;
2420 bool runtime_invisible_type_annotations_exists = false;
2421 bool runtime_invisible_parameter_annotations_exists = false;
2422 const u1* annotation_default = NULL;
2423 int annotation_default_length = 0;
2424
2425 // Parse code and exceptions attribute
2426 u2 method_attributes_count = cfs->get_u2_fast();
2427 while (method_attributes_count--) {
2428 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2429 const u2 method_attribute_name_index = cfs->get_u2_fast();
2430 const u4 method_attribute_length = cfs->get_u4_fast();
2431 check_property(
2432 valid_symbol_at(method_attribute_name_index),
2433 "Invalid method attribute name index %u in class file %s",
2434 method_attribute_name_index, CHECK_NULL);
2435
2436 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2437 if (method_attribute_name == vmSymbols::tag_code()) {
2438 // Parse Code attribute
2439 if (_need_verify) {
2440 guarantee_property(
2441 !access_flags.is_native() && !access_flags.is_abstract(),
2442 "Code attribute in native or abstract methods in class file %s",
2443 CHECK_NULL);
2444 }
2445 if (parsed_code_attribute) {
2446 classfile_parse_error("Multiple Code attributes in class file %s",
2447 CHECK_NULL);
2448 }
2449 parsed_code_attribute = true;
2450
2451 // Stack size, locals size, and code size
2452 cfs->guarantee_more(8, CHECK_NULL);
2453 max_stack = cfs->get_u2_fast();
2454 max_locals = cfs->get_u2_fast();
2455 code_length = cfs->get_u4_fast();
2456 if (_need_verify) {
2457 guarantee_property(args_size <= max_locals,
2458 "Arguments can't fit into locals in class file %s",
2459 CHECK_NULL);
2460 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2461 "Invalid method Code length %u in class file %s",
2462 code_length, CHECK_NULL);
2463 }
2464 // Code pointer
2465 code_start = cfs->current();
2466 assert(code_start != NULL, "null code start");
2467 cfs->guarantee_more(code_length, CHECK_NULL);
2468 cfs->skip_u1_fast(code_length);
2469
2470 // Exception handler table
2471 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2472 exception_table_length = cfs->get_u2_fast();
2473 if (exception_table_length > 0) {
2474 exception_table_start = parse_exception_table(cfs,
2475 code_length,
2476 exception_table_length,
2477 CHECK_NULL);
2478 }
2479
2480 // Parse additional attributes in code attribute
2481 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2482 u2 code_attributes_count = cfs->get_u2_fast();
2483
2484 unsigned int calculated_attribute_length = 0;
2485
2486 calculated_attribute_length =
2487 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2488 calculated_attribute_length +=
2489 code_length +
2490 sizeof(exception_table_length) +
2491 sizeof(code_attributes_count) +
2492 exception_table_length *
2493 ( sizeof(u2) + // start_pc
2494 sizeof(u2) + // end_pc
2495 sizeof(u2) + // handler_pc
2496 sizeof(u2) ); // catch_type_index
2497
2498 while (code_attributes_count--) {
2499 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2500 const u2 code_attribute_name_index = cfs->get_u2_fast();
2501 const u4 code_attribute_length = cfs->get_u4_fast();
2502 calculated_attribute_length += code_attribute_length +
2503 sizeof(code_attribute_name_index) +
2504 sizeof(code_attribute_length);
2505 check_property(valid_symbol_at(code_attribute_name_index),
2506 "Invalid code attribute name index %u in class file %s",
2507 code_attribute_name_index,
2508 CHECK_NULL);
2509 if (LoadLineNumberTables &&
2510 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2511 // Parse and compress line number table
2512 parse_linenumber_table(code_attribute_length,
2513 code_length,
2514 &linenumber_table,
2515 CHECK_NULL);
2516
2517 } else if (LoadLocalVariableTables &&
2518 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2519 // Parse local variable table
2520 if (!lvt_allocated) {
2521 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2522 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2523 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2524 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2525 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2526 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2527 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2528 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2529 lvt_allocated = true;
2530 }
2531 if (lvt_cnt == max_lvt_cnt) {
2532 max_lvt_cnt <<= 1;
2533 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2534 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2535 }
2536 localvariable_table_start[lvt_cnt] =
2537 parse_localvariable_table(cfs,
2538 code_length,
2539 max_locals,
2540 code_attribute_length,
2541 &localvariable_table_length[lvt_cnt],
2542 false, // is not LVTT
2543 CHECK_NULL);
2544 total_lvt_length += localvariable_table_length[lvt_cnt];
2545 lvt_cnt++;
2546 } else if (LoadLocalVariableTypeTables &&
2547 _major_version >= JAVA_1_5_VERSION &&
2548 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2549 if (!lvt_allocated) {
2550 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2551 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2552 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2553 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2554 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2555 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2556 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2557 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2558 lvt_allocated = true;
2559 }
2560 // Parse local variable type table
2561 if (lvtt_cnt == max_lvtt_cnt) {
2562 max_lvtt_cnt <<= 1;
2563 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2564 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2565 }
2566 localvariable_type_table_start[lvtt_cnt] =
2567 parse_localvariable_table(cfs,
2568 code_length,
2569 max_locals,
2570 code_attribute_length,
2571 &localvariable_type_table_length[lvtt_cnt],
2572 true, // is LVTT
2573 CHECK_NULL);
2574 lvtt_cnt++;
2575 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2576 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2577 // Stack map is only needed by the new verifier in JDK1.5.
2578 if (parsed_stackmap_attribute) {
2579 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2580 }
2581 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2582 stackmap_data_length = code_attribute_length;
2583 parsed_stackmap_attribute = true;
2584 } else {
2585 // Skip unknown attributes
2586 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2587 }
2588 }
2589 // check method attribute length
2590 if (_need_verify) {
2591 guarantee_property(method_attribute_length == calculated_attribute_length,
2592 "Code segment has wrong length in class file %s",
2593 CHECK_NULL);
2594 }
2595 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2596 // Parse Exceptions attribute
2597 if (parsed_checked_exceptions_attribute) {
2598 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2599 CHECK_NULL);
2600 }
2601 parsed_checked_exceptions_attribute = true;
2602 checked_exceptions_start =
2603 parse_checked_exceptions(cfs,
2604 &checked_exceptions_length,
2605 method_attribute_length,
2606 CHECK_NULL);
2607 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2608 // reject multiple method parameters
2609 if (method_parameters_seen) {
2610 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2611 CHECK_NULL);
2612 }
2613 method_parameters_seen = true;
2614 method_parameters_length = cfs->get_u1_fast();
2615 const u2 real_length = (method_parameters_length * 4u) + 1u;
2616 if (method_attribute_length != real_length) {
2617 classfile_parse_error(
2618 "Invalid MethodParameters method attribute length %u in class file",
2619 method_attribute_length, CHECK_NULL);
2620 }
2621 method_parameters_data = cfs->current();
2622 cfs->skip_u2_fast(method_parameters_length);
2623 cfs->skip_u2_fast(method_parameters_length);
2624 // ignore this attribute if it cannot be reflected
2625 if (!SystemDictionary::Parameter_klass_loaded())
2626 method_parameters_length = -1;
2627 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2628 if (method_attribute_length != 0) {
2629 classfile_parse_error(
2630 "Invalid Synthetic method attribute length %u in class file %s",
2631 method_attribute_length, CHECK_NULL);
2632 }
2633 // Should we check that there hasn't already been a synthetic attribute?
2634 access_flags.set_is_synthetic();
2635 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2636 if (method_attribute_length != 0) {
2637 classfile_parse_error(
2638 "Invalid Deprecated method attribute length %u in class file %s",
2639 method_attribute_length, CHECK_NULL);
2640 }
2641 } else if (_major_version >= JAVA_1_5_VERSION) {
2642 if (method_attribute_name == vmSymbols::tag_signature()) {
2643 if (generic_signature_index != 0) {
2644 classfile_parse_error(
2645 "Multiple Signature attributes for method in class file %s",
2646 CHECK_NULL);
2647 }
2648 if (method_attribute_length != 2) {
2649 classfile_parse_error(
2650 "Invalid Signature attribute length %u in class file %s",
2651 method_attribute_length, CHECK_NULL);
2652 }
2653 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2654 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2655 if (runtime_visible_annotations != NULL) {
2656 classfile_parse_error(
2657 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2658 CHECK_NULL);
2659 }
2660 runtime_visible_annotations_length = method_attribute_length;
2661 runtime_visible_annotations = cfs->current();
2662 assert(runtime_visible_annotations != NULL, "null visible annotations");
2663 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2664 parse_annotations(cp,
2665 runtime_visible_annotations,
2666 runtime_visible_annotations_length,
2667 &parsed_annotations,
2668 _loader_data,
2669 CHECK_NULL);
2670 cfs->skip_u1_fast(runtime_visible_annotations_length);
2671 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2672 if (runtime_invisible_annotations_exists) {
2673 classfile_parse_error(
2674 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2675 CHECK_NULL);
2676 }
2677 runtime_invisible_annotations_exists = true;
2678 if (PreserveAllAnnotations) {
2679 runtime_invisible_annotations_length = method_attribute_length;
2680 runtime_invisible_annotations = cfs->current();
2681 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2682 }
2683 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2684 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2685 if (runtime_visible_parameter_annotations != NULL) {
2686 classfile_parse_error(
2687 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2688 CHECK_NULL);
2689 }
2690 runtime_visible_parameter_annotations_length = method_attribute_length;
2691 runtime_visible_parameter_annotations = cfs->current();
2692 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2693 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2694 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2695 if (runtime_invisible_parameter_annotations_exists) {
2696 classfile_parse_error(
2697 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2698 CHECK_NULL);
2699 }
2700 runtime_invisible_parameter_annotations_exists = true;
2701 if (PreserveAllAnnotations) {
2702 runtime_invisible_parameter_annotations_length = method_attribute_length;
2703 runtime_invisible_parameter_annotations = cfs->current();
2704 assert(runtime_invisible_parameter_annotations != NULL,
2705 "null invisible parameter annotations");
2706 }
2707 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2708 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2709 if (annotation_default != NULL) {
2710 classfile_parse_error(
2711 "Multiple AnnotationDefault attributes for method in class file %s",
2712 CHECK_NULL);
2713 }
2714 annotation_default_length = method_attribute_length;
2715 annotation_default = cfs->current();
2716 assert(annotation_default != NULL, "null annotation default");
2717 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2718 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2719 if (runtime_visible_type_annotations != NULL) {
2720 classfile_parse_error(
2721 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2722 CHECK_NULL);
2723 }
2724 runtime_visible_type_annotations_length = method_attribute_length;
2725 runtime_visible_type_annotations = cfs->current();
2726 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2727 // No need for the VM to parse Type annotations
2728 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2729 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2730 if (runtime_invisible_type_annotations_exists) {
2731 classfile_parse_error(
2732 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2733 CHECK_NULL);
2734 } else {
2735 runtime_invisible_type_annotations_exists = true;
2736 }
2737 if (PreserveAllAnnotations) {
2738 runtime_invisible_type_annotations_length = method_attribute_length;
2739 runtime_invisible_type_annotations = cfs->current();
2740 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2741 }
2742 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2743 } else {
2744 // Skip unknown attributes
2745 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2746 }
2747 } else {
2748 // Skip unknown attributes
2749 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2750 }
2751 }
2752
2753 if (linenumber_table != NULL) {
2754 linenumber_table->write_terminator();
2755 linenumber_table_length = linenumber_table->position();
2756 }
2757
2758 // Make sure there's at least one Code attribute in non-native/non-abstract method
2759 if (_need_verify) {
2760 guarantee_property(access_flags.is_native() ||
2761 access_flags.is_abstract() ||
2762 parsed_code_attribute,
2763 "Absent Code attribute in method that is not native or abstract in class file %s",
2764 CHECK_NULL);
2765 }
2766
2767 // All sizing information for a Method* is finally available, now create it
2768 InlineTableSizes sizes(
2769 total_lvt_length,
2770 linenumber_table_length,
2771 exception_table_length,
2772 checked_exceptions_length,
2773 method_parameters_length,
2774 generic_signature_index,
2775 runtime_visible_annotations_length +
2776 runtime_invisible_annotations_length,
2777 runtime_visible_parameter_annotations_length +
2778 runtime_invisible_parameter_annotations_length,
2779 runtime_visible_type_annotations_length +
2780 runtime_invisible_type_annotations_length,
2781 annotation_default_length,
2782 0);
2783
2784 Method* const m = Method::allocate(_loader_data,
2785 code_length,
2786 access_flags,
2787 &sizes,
2788 ConstMethod::NORMAL,
2789 CHECK_NULL);
2790
2791 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2792
2793 // Fill in information from fixed part (access_flags already set)
2794 m->set_constants(_cp);
2795 m->set_name_index(name_index);
2796 m->set_signature_index(signature_index);
2797
2798 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2799 m->constMethod()->set_result_type(rtf.type());
2800
2801 if (args_size >= 0) {
2802 m->set_size_of_parameters(args_size);
2803 } else {
2804 m->compute_size_of_parameters(THREAD);
2805 }
2806 #ifdef ASSERT
2807 if (args_size >= 0) {
2808 m->compute_size_of_parameters(THREAD);
2809 assert(args_size == m->size_of_parameters(), "");
2810 }
2811 #endif
2812
2813 // Fill in code attribute information
2814 m->set_max_stack(max_stack);
2815 m->set_max_locals(max_locals);
2816 if (stackmap_data != NULL) {
2817 m->constMethod()->copy_stackmap_data(_loader_data,
2818 (u1*)stackmap_data,
2819 stackmap_data_length,
2820 CHECK_NULL);
2821 }
2822
2823 // Copy byte codes
2824 m->set_code((u1*)code_start);
2825
2826 // Copy line number table
2827 if (linenumber_table != NULL) {
2828 memcpy(m->compressed_linenumber_table(),
2829 linenumber_table->buffer(),
2830 linenumber_table_length);
2831 }
2832
2833 // Copy exception table
2834 if (exception_table_length > 0) {
2835 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2836 m->exception_table_start(),
2837 exception_table_length * sizeof(ExceptionTableElement),
2838 sizeof(u2));
2839 }
2840
2841 // Copy method parameters
2842 if (method_parameters_length > 0) {
2843 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2844 for (int i = 0; i < method_parameters_length; i++) {
2845 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2846 method_parameters_data += 2;
2847 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2848 method_parameters_data += 2;
2849 }
2850 }
2851
2852 // Copy checked exceptions
2853 if (checked_exceptions_length > 0) {
2854 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2855 m->checked_exceptions_start(),
2856 checked_exceptions_length * sizeof(CheckedExceptionElement),
2857 sizeof(u2));
2858 }
2859
2860 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2861 if (total_lvt_length > 0) {
2862 promoted_flags->set_has_localvariable_table();
2863 copy_localvariable_table(m->constMethod(),
2864 lvt_cnt,
2865 localvariable_table_length,
2866 localvariable_table_start,
2867 lvtt_cnt,
2868 localvariable_type_table_length,
2869 localvariable_type_table_start,
2870 CHECK_NULL);
2871 }
2872
2873 if (parsed_annotations.has_any_annotations())
2874 parsed_annotations.apply_to(methodHandle(THREAD, m));
2875
2876 // Copy annotations
2877 copy_method_annotations(m->constMethod(),
2878 runtime_visible_annotations,
2879 runtime_visible_annotations_length,
2880 runtime_invisible_annotations,
2881 runtime_invisible_annotations_length,
2882 runtime_visible_parameter_annotations,
2883 runtime_visible_parameter_annotations_length,
2884 runtime_invisible_parameter_annotations,
2885 runtime_invisible_parameter_annotations_length,
2886 runtime_visible_type_annotations,
2887 runtime_visible_type_annotations_length,
2888 runtime_invisible_type_annotations,
2889 runtime_invisible_type_annotations_length,
2890 annotation_default,
2891 annotation_default_length,
2892 CHECK_NULL);
2893
2894 if (name == vmSymbols::finalize_method_name() &&
2895 signature == vmSymbols::void_method_signature()) {
2896 if (m->is_empty_method()) {
2897 _has_empty_finalizer = true;
2898 } else {
2899 _has_finalizer = true;
2900 }
2901 }
2902 if (name == vmSymbols::object_initializer_name() &&
2903 signature == vmSymbols::void_method_signature() &&
2904 m->is_vanilla_constructor()) {
2905 _has_vanilla_constructor = true;
2906 }
2907
2908 NOT_PRODUCT(m->verify());
2909 return m;
2910 }
2911
2912
2913 // The promoted_flags parameter is used to pass relevant access_flags
2914 // from the methods back up to the containing klass. These flag values
2915 // are added to klass's access_flags.
2916 // Side-effects: populates the _methods field in the parser
2917 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2918 bool is_interface,
2919 AccessFlags* promoted_flags,
2920 bool* has_final_method,
2921 bool* declares_nonstatic_concrete_methods,
2922 TRAPS) {
2923 assert(cfs != NULL, "invariant");
2924 assert(promoted_flags != NULL, "invariant");
2925 assert(has_final_method != NULL, "invariant");
2926 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2927
2928 assert(NULL == _methods, "invariant");
2929
2930 cfs->guarantee_more(2, CHECK); // length
2931 const u2 length = cfs->get_u2_fast();
2932 if (length == 0) {
2933 _methods = Universe::the_empty_method_array();
2934 } else {
2935 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2936 length,
2937 NULL,
2938 CHECK);
2939
2940 for (int index = 0; index < length; index++) {
2941 Method* method = parse_method(cfs,
2942 is_interface,
2943 _cp,
2944 promoted_flags,
2945 CHECK);
2946
2947 if (method->is_final()) {
2948 *has_final_method = true;
2949 }
2950 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2951 // used for interface initialization, and default method inheritance analysis
2952 if (is_interface && !(*declares_nonstatic_concrete_methods)
2953 && !method->is_abstract() && !method->is_static()) {
2954 *declares_nonstatic_concrete_methods = true;
2955 }
2956 _methods->at_put(index, method);
2957 }
2958
2959 if (_need_verify && length > 1) {
2960 // Check duplicated methods
2961 ResourceMark rm(THREAD);
2962 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2963 THREAD, NameSigHash*, HASH_ROW_SIZE);
2964 initialize_hashtable(names_and_sigs);
2965 bool dup = false;
2966 const Symbol* name = NULL;
2967 const Symbol* sig = NULL;
2968 {
2969 debug_only(NoSafepointVerifier nsv;)
2970 for (int i = 0; i < length; i++) {
2971 const Method* const m = _methods->at(i);
2972 name = m->name();
2973 sig = m->signature();
2974 // If no duplicates, add name/signature in hashtable names_and_sigs.
2975 if (!put_after_lookup(name, sig, names_and_sigs)) {
2976 dup = true;
2977 break;
2978 }
2979 }
2980 }
2981 if (dup) {
2982 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2983 name->as_C_string(), sig->as_klass_external_name(), CHECK);
2984 }
2985 }
2986 }
2987 }
2988
2989 static const intArray* sort_methods(Array<Method*>* methods) {
2990 const int length = methods->length();
2991 // If JVMTI original method ordering or sharing is enabled we have to
2992 // remember the original class file ordering.
2993 // We temporarily use the vtable_index field in the Method* to store the
2994 // class file index, so we can read in after calling qsort.
2995 // Put the method ordering in the shared archive.
2996 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) {
2997 for (int index = 0; index < length; index++) {
2998 Method* const m = methods->at(index);
2999 assert(!m->valid_vtable_index(), "vtable index should not be set");
3000 m->set_vtable_index(index);
3001 }
3002 }
3003 // Sort method array by ascending method name (for faster lookups & vtable construction)
3004 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3005 Method::sort_methods(methods);
3006
3007 intArray* method_ordering = NULL;
3008 // If JVMTI original method ordering or sharing is enabled construct int
3009 // array remembering the original ordering
3010 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) {
3011 method_ordering = new intArray(length, length, -1);
3012 for (int index = 0; index < length; index++) {
3013 Method* const m = methods->at(index);
3014 const int old_index = m->vtable_index();
3015 assert(old_index >= 0 && old_index < length, "invalid method index");
3016 method_ordering->at_put(index, old_index);
3017 m->set_vtable_index(Method::invalid_vtable_index);
3018 }
3019 }
3020 return method_ordering;
3021 }
3022
3023 // Parse generic_signature attribute for methods and fields
3024 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3025 TRAPS) {
3026 assert(cfs != NULL, "invariant");
3027
3028 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3029 const u2 generic_signature_index = cfs->get_u2_fast();
3030 check_property(
3031 valid_symbol_at(generic_signature_index),
3032 "Invalid Signature attribute at constant pool index %u in class file %s",
3033 generic_signature_index, CHECK_0);
3034 return generic_signature_index;
3035 }
3036
3037 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3038 TRAPS) {
3039
3040 assert(cfs != NULL, "invariant");
3041
3042 cfs->guarantee_more(2, CHECK); // sourcefile_index
3043 const u2 sourcefile_index = cfs->get_u2_fast();
3044 check_property(
3045 valid_symbol_at(sourcefile_index),
3046 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3047 sourcefile_index, CHECK);
3048 set_class_sourcefile_index(sourcefile_index);
3049 }
3050
3051 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3052 int length,
3053 TRAPS) {
3054 assert(cfs != NULL, "invariant");
3055
3056 const u1* const sde_buffer = cfs->current();
3057 assert(sde_buffer != NULL, "null sde buffer");
3058
3059 // Don't bother storing it if there is no way to retrieve it
3060 if (JvmtiExport::can_get_source_debug_extension()) {
3061 assert((length+1) > length, "Overflow checking");
3062 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3063 for (int i = 0; i < length; i++) {
3064 sde[i] = sde_buffer[i];
3065 }
3066 sde[length] = '\0';
3067 set_class_sde_buffer((const char*)sde, length);
3068 }
3069 // Got utf8 string, set stream position forward
3070 cfs->skip_u1(length, CHECK);
3071 }
3072
3073
3074 // Inner classes can be static, private or protected (classic VM does this)
3075 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3076 JVM_ACC_PRIVATE | \
3077 JVM_ACC_PROTECTED | \
3078 JVM_ACC_STATIC \
3079 )
3080
3081 // Return number of classes in the inner classes attribute table
3082 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3083 const u1* const inner_classes_attribute_start,
3084 bool parsed_enclosingmethod_attribute,
3085 u2 enclosing_method_class_index,
3086 u2 enclosing_method_method_index,
3087 TRAPS) {
3088 const u1* const current_mark = cfs->current();
3089 u2 length = 0;
3090 if (inner_classes_attribute_start != NULL) {
3091 cfs->set_current(inner_classes_attribute_start);
3092 cfs->guarantee_more(2, CHECK_0); // length
3093 length = cfs->get_u2_fast();
3094 }
3095
3096 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3097 // method data:
3098 // [inner_class_info_index,
3099 // outer_class_info_index,
3100 // inner_name_index,
3101 // inner_class_access_flags,
3102 // ...
3103 // enclosing_method_class_index,
3104 // enclosing_method_method_index]
3105 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3106 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3107 _inner_classes = inner_classes;
3108
3109 int index = 0;
3110 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3111 for (int n = 0; n < length; n++) {
3112 // Inner class index
3113 const u2 inner_class_info_index = cfs->get_u2_fast();
3114 check_property(
3115 valid_klass_reference_at(inner_class_info_index),
3116 "inner_class_info_index %u has bad constant type in class file %s",
3117 inner_class_info_index, CHECK_0);
3118 // Outer class index
3119 const u2 outer_class_info_index = cfs->get_u2_fast();
3120 check_property(
3121 outer_class_info_index == 0 ||
3122 valid_klass_reference_at(outer_class_info_index),
3123 "outer_class_info_index %u has bad constant type in class file %s",
3124 outer_class_info_index, CHECK_0);
3125 // Inner class name
3126 const u2 inner_name_index = cfs->get_u2_fast();
3127 check_property(
3128 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3129 "inner_name_index %u has bad constant type in class file %s",
3130 inner_name_index, CHECK_0);
3131 if (_need_verify) {
3132 guarantee_property(inner_class_info_index != outer_class_info_index,
3133 "Class is both outer and inner class in class file %s", CHECK_0);
3134 }
3135 // Access flags
3136 jint flags;
3137 // JVM_ACC_MODULE is defined in JDK-9 and later.
3138 if (_major_version >= JAVA_9_VERSION) {
3139 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3140 } else {
3141 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3142 }
3143 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3144 // Set abstract bit for old class files for backward compatibility
3145 flags |= JVM_ACC_ABSTRACT;
3146 }
3147 verify_legal_class_modifiers(flags, CHECK_0);
3148 AccessFlags inner_access_flags(flags);
3149
3150 inner_classes->at_put(index++, inner_class_info_index);
3151 inner_classes->at_put(index++, outer_class_info_index);
3152 inner_classes->at_put(index++, inner_name_index);
3153 inner_classes->at_put(index++, inner_access_flags.as_short());
3154 }
3155
3156 // 4347400: make sure there's no duplicate entry in the classes array
3157 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3158 for(int i = 0; i < length * 4; i += 4) {
3159 for(int j = i + 4; j < length * 4; j += 4) {
3160 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3161 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3162 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3163 inner_classes->at(i+3) != inner_classes->at(j+3)),
3164 "Duplicate entry in InnerClasses in class file %s",
3165 CHECK_0);
3166 }
3167 }
3168 }
3169
3170 // Set EnclosingMethod class and method indexes.
3171 if (parsed_enclosingmethod_attribute) {
3172 inner_classes->at_put(index++, enclosing_method_class_index);
3173 inner_classes->at_put(index++, enclosing_method_method_index);
3174 }
3175 assert(index == size, "wrong size");
3176
3177 // Restore buffer's current position.
3178 cfs->set_current(current_mark);
3179
3180 return length;
3181 }
3182
3183 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3184 const u1* const nest_members_attribute_start,
3185 TRAPS) {
3186 const u1* const current_mark = cfs->current();
3187 u2 length = 0;
3188 if (nest_members_attribute_start != NULL) {
3189 cfs->set_current(nest_members_attribute_start);
3190 cfs->guarantee_more(2, CHECK_0); // length
3191 length = cfs->get_u2_fast();
3192 }
3193 const int size = length;
3194 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3195 _nest_members = nest_members;
3196
3197 int index = 0;
3198 cfs->guarantee_more(2 * length, CHECK_0);
3199 for (int n = 0; n < length; n++) {
3200 const u2 class_info_index = cfs->get_u2_fast();
3201 check_property(
3202 valid_klass_reference_at(class_info_index),
3203 "Nest member class_info_index %u has bad constant type in class file %s",
3204 class_info_index, CHECK_0);
3205 nest_members->at_put(index++, class_info_index);
3206 }
3207 assert(index == size, "wrong size");
3208
3209 // Restore buffer's current position.
3210 cfs->set_current(current_mark);
3211
3212 return length;
3213 }
3214
3215 // Record {
3216 // u2 attribute_name_index;
3217 // u4 attribute_length;
3218 // u2 components_count;
3219 // component_info components[components_count];
3220 // }
3221 // component_info {
3222 // u2 name_index;
3223 // u2 descriptor_index
3224 // u2 attributes_count;
3225 // attribute_info_attributes[attributes_count];
3226 // }
3227 u2 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3228 const ConstantPool* cp,
3229 const u1* const record_attribute_start,
3230 TRAPS) {
3231 const u1* const current_mark = cfs->current();
3232 int components_count = 0;
3233 unsigned int calculate_attr_size = 0;
3234 if (record_attribute_start != NULL) {
3235 cfs->set_current(record_attribute_start);
3236 cfs->guarantee_more(2, CHECK_0); // num of components
3237 components_count = (int)cfs->get_u2_fast();
3238 calculate_attr_size = 2;
3239 }
3240
3241 Array<RecordComponent*>* const record_components =
3242 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, NULL, CHECK_0);
3243 _record_components = record_components;
3244
3245 for (int x = 0; x < components_count; x++) {
3246 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3247
3248 const u2 name_index = cfs->get_u2_fast();
3249 check_property(valid_symbol_at(name_index),
3250 "Invalid constant pool index %u for name in Record attribute in class file %s",
3251 name_index, CHECK_0);
3252 const Symbol* const name = cp->symbol_at(name_index);
3253 verify_legal_field_name(name, CHECK_0);
3254
3255 const u2 descriptor_index = cfs->get_u2_fast();
3256 check_property(valid_symbol_at(descriptor_index),
3257 "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3258 descriptor_index, CHECK_0);
3259 const Symbol* const descr = cp->symbol_at(descriptor_index);
3260 verify_legal_field_signature(name, descr, CHECK_0);
3261
3262 const u2 attributes_count = cfs->get_u2_fast();
3263 calculate_attr_size += 6;
3264 u2 generic_sig_index = 0;
3265 const u1* runtime_visible_annotations = NULL;
3266 int runtime_visible_annotations_length = 0;
3267 const u1* runtime_invisible_annotations = NULL;
3268 int runtime_invisible_annotations_length = 0;
3269 bool runtime_invisible_annotations_exists = false;
3270 const u1* runtime_visible_type_annotations = NULL;
3271 int runtime_visible_type_annotations_length = 0;
3272 const u1* runtime_invisible_type_annotations = NULL;
3273 int runtime_invisible_type_annotations_length = 0;
3274 bool runtime_invisible_type_annotations_exists = false;
3275
3276 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3277 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
3278 for (int y = 0; y < attributes_count; y++) {
3279 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
3280 const u2 attribute_name_index = cfs->get_u2_fast();
3281 const u4 attribute_length = cfs->get_u4_fast();
3282 calculate_attr_size += 6;
3283 check_property(
3284 valid_symbol_at(attribute_name_index),
3285 "Invalid Record attribute name index %u in class file %s",
3286 attribute_name_index, CHECK_0);
3287
3288 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3289 if (attribute_name == vmSymbols::tag_signature()) {
3290 if (generic_sig_index != 0) {
3291 classfile_parse_error(
3292 "Multiple Signature attributes for Record component in class file %s",
3293 CHECK_0);
3294 }
3295 if (attribute_length != 2) {
3296 classfile_parse_error(
3297 "Invalid Signature attribute length %u in Record component in class file %s",
3298 attribute_length, CHECK_0);
3299 }
3300 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3301
3302 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3303 if (runtime_visible_annotations != NULL) {
3304 classfile_parse_error(
3305 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", CHECK_0);
3306 }
3307 runtime_visible_annotations_length = attribute_length;
3308 runtime_visible_annotations = cfs->current();
3309
3310 assert(runtime_visible_annotations != NULL, "null record component visible annotation");
3311 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3312 cfs->skip_u1_fast(runtime_visible_annotations_length);
3313
3314 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3315 if (runtime_invisible_annotations_exists) {
3316 classfile_parse_error(
3317 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", CHECK_0);
3318 }
3319 runtime_invisible_annotations_exists = true;
3320 if (PreserveAllAnnotations) {
3321 runtime_invisible_annotations_length = attribute_length;
3322 runtime_invisible_annotations = cfs->current();
3323 assert(runtime_invisible_annotations != NULL, "null record component invisible annotation");
3324 }
3325 cfs->skip_u1(attribute_length, CHECK_0);
3326
3327 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3328 if (runtime_visible_type_annotations != NULL) {
3329 classfile_parse_error(
3330 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", CHECK_0);
3331 }
3332 runtime_visible_type_annotations_length = attribute_length;
3333 runtime_visible_type_annotations = cfs->current();
3334
3335 assert(runtime_visible_type_annotations != NULL, "null record component visible type annotation");
3336 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3337 cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3338
3339 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3340 if (runtime_invisible_type_annotations_exists) {
3341 classfile_parse_error(
3342 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", CHECK_0);
3343 }
3344 runtime_invisible_type_annotations_exists = true;
3345 if (PreserveAllAnnotations) {
3346 runtime_invisible_type_annotations_length = attribute_length;
3347 runtime_invisible_type_annotations = cfs->current();
3348 assert(runtime_invisible_type_annotations != NULL, "null record component invisible type annotation");
3349 }
3350 cfs->skip_u1(attribute_length, CHECK_0);
3351
3352 } else {
3353 // Skip unknown attributes
3354 cfs->skip_u1(attribute_length, CHECK_0);
3355 }
3356 calculate_attr_size += attribute_length;
3357 } // End of attributes For loop
3358
3359 AnnotationArray* annotations = assemble_annotations(runtime_visible_annotations,
3360 runtime_visible_annotations_length,
3361 runtime_invisible_annotations,
3362 runtime_invisible_annotations_length,
3363 CHECK_0);
3364 AnnotationArray* type_annotations = assemble_annotations(runtime_visible_type_annotations,
3365 runtime_visible_type_annotations_length,
3366 runtime_invisible_type_annotations,
3367 runtime_invisible_type_annotations_length,
3368 CHECK_0);
3369
3370 RecordComponent* record_component =
3371 RecordComponent::allocate(_loader_data, name_index, descriptor_index,
3372 attributes_count, generic_sig_index,
3373 annotations, type_annotations, CHECK_0);
3374 record_components->at_put(x, record_component);
3375 } // End of component processing loop
3376
3377 // Restore buffer's current position.
3378 cfs->set_current(current_mark);
3379 return calculate_attr_size;
3380 }
3381
3382 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3383 set_class_synthetic_flag(true);
3384 }
3385
3386 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3387 assert(cfs != NULL, "invariant");
3388
3389 const u2 signature_index = cfs->get_u2(CHECK);
3390 check_property(
3391 valid_symbol_at(signature_index),
3392 "Invalid constant pool index %u in Signature attribute in class file %s",
3393 signature_index, CHECK);
3394 set_class_generic_signature_index(signature_index);
3395 }
3396
3397 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3398 ConstantPool* cp,
3399 u4 attribute_byte_length,
3400 TRAPS) {
3401 assert(cfs != NULL, "invariant");
3402 assert(cp != NULL, "invariant");
3403
3404 const u1* const current_start = cfs->current();
3405
3406 guarantee_property(attribute_byte_length >= sizeof(u2),
3407 "Invalid BootstrapMethods attribute length %u in class file %s",
3408 attribute_byte_length,
3409 CHECK);
3410
3411 cfs->guarantee_more(attribute_byte_length, CHECK);
3412
3413 const int attribute_array_length = cfs->get_u2_fast();
3414
3415 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3416 "Short length on BootstrapMethods in class file %s",
3417 CHECK);
3418
3419
3420 // The attribute contains a counted array of counted tuples of shorts,
3421 // represending bootstrap specifiers:
3422 // length*{bootstrap_method_index, argument_count*{argument_index}}
3423 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3424 // operand_count = number of shorts in attr, except for leading length
3425
3426 // The attribute is copied into a short[] array.
3427 // The array begins with a series of short[2] pairs, one for each tuple.
3428 const int index_size = (attribute_array_length * 2);
3429
3430 Array<u2>* const operands =
3431 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3432
3433 // Eagerly assign operands so they will be deallocated with the constant
3434 // pool if there is an error.
3435 cp->set_operands(operands);
3436
3437 int operand_fill_index = index_size;
3438 const int cp_size = cp->length();
3439
3440 for (int n = 0; n < attribute_array_length; n++) {
3441 // Store a 32-bit offset into the header of the operand array.
3442 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3443
3444 // Read a bootstrap specifier.
3445 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3446 const u2 bootstrap_method_index = cfs->get_u2_fast();
3447 const u2 argument_count = cfs->get_u2_fast();
3448 check_property(
3449 valid_cp_range(bootstrap_method_index, cp_size) &&
3450 cp->tag_at(bootstrap_method_index).is_method_handle(),
3451 "bootstrap_method_index %u has bad constant type in class file %s",
3452 bootstrap_method_index,
3453 CHECK);
3454
3455 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3456 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3457 CHECK);
3458
3459 operands->at_put(operand_fill_index++, bootstrap_method_index);
3460 operands->at_put(operand_fill_index++, argument_count);
3461
3462 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3463 for (int j = 0; j < argument_count; j++) {
3464 const u2 argument_index = cfs->get_u2_fast();
3465 check_property(
3466 valid_cp_range(argument_index, cp_size) &&
3467 cp->tag_at(argument_index).is_loadable_constant(),
3468 "argument_index %u has bad constant type in class file %s",
3469 argument_index,
3470 CHECK);
3471 operands->at_put(operand_fill_index++, argument_index);
3472 }
3473 }
3474 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3475 "Bad length on BootstrapMethods in class file %s",
3476 CHECK);
3477 }
3478
3479 bool ClassFileParser::supports_records() {
3480 return _major_version == JAVA_14_VERSION &&
3481 _minor_version == JAVA_PREVIEW_MINOR_VERSION &&
3482 Arguments::enable_preview();
3483 }
3484
3485 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3486 ConstantPool* cp,
3487 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3488 TRAPS) {
3489 assert(cfs != NULL, "invariant");
3490 assert(cp != NULL, "invariant");
3491 assert(parsed_annotations != NULL, "invariant");
3492
3493 // Set inner classes attribute to default sentinel
3494 _inner_classes = Universe::the_empty_short_array();
3495 // Set nest members attribute to default sentinel
3496 _nest_members = Universe::the_empty_short_array();
3497 cfs->guarantee_more(2, CHECK); // attributes_count
3498 u2 attributes_count = cfs->get_u2_fast();
3499 bool parsed_sourcefile_attribute = false;
3500 bool parsed_innerclasses_attribute = false;
3501 bool parsed_nest_members_attribute = false;
3502 bool parsed_nest_host_attribute = false;
3503 bool parsed_record_attribute = false;
3504 bool parsed_enclosingmethod_attribute = false;
3505 bool parsed_bootstrap_methods_attribute = false;
3506 const u1* runtime_visible_annotations = NULL;
3507 int runtime_visible_annotations_length = 0;
3508 const u1* runtime_invisible_annotations = NULL;
3509 int runtime_invisible_annotations_length = 0;
3510 const u1* runtime_visible_type_annotations = NULL;
3511 int runtime_visible_type_annotations_length = 0;
3512 const u1* runtime_invisible_type_annotations = NULL;
3513 int runtime_invisible_type_annotations_length = 0;
3514 bool runtime_invisible_type_annotations_exists = false;
3515 bool runtime_invisible_annotations_exists = false;
3516 bool parsed_source_debug_ext_annotations_exist = false;
3517 const u1* inner_classes_attribute_start = NULL;
3518 u4 inner_classes_attribute_length = 0;
3519 u2 enclosing_method_class_index = 0;
3520 u2 enclosing_method_method_index = 0;
3521 const u1* nest_members_attribute_start = NULL;
3522 u4 nest_members_attribute_length = 0;
3523 const u1* record_attribute_start = NULL;
3524 u4 record_attribute_length = 0;
3525
3526 // Iterate over attributes
3527 while (attributes_count--) {
3528 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3529 const u2 attribute_name_index = cfs->get_u2_fast();
3530 const u4 attribute_length = cfs->get_u4_fast();
3531 check_property(
3532 valid_symbol_at(attribute_name_index),
3533 "Attribute name has bad constant pool index %u in class file %s",
3534 attribute_name_index, CHECK);
3535 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3536 if (tag == vmSymbols::tag_source_file()) {
3537 // Check for SourceFile tag
3538 if (_need_verify) {
3539 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3540 }
3541 if (parsed_sourcefile_attribute) {
3542 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3543 } else {
3544 parsed_sourcefile_attribute = true;
3545 }
3546 parse_classfile_sourcefile_attribute(cfs, CHECK);
3547 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3548 // Check for SourceDebugExtension tag
3549 if (parsed_source_debug_ext_annotations_exist) {
3550 classfile_parse_error(
3551 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3552 }
3553 parsed_source_debug_ext_annotations_exist = true;
3554 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3555 } else if (tag == vmSymbols::tag_inner_classes()) {
3556 // Check for InnerClasses tag
3557 if (parsed_innerclasses_attribute) {
3558 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3559 } else {
3560 parsed_innerclasses_attribute = true;
3561 }
3562 inner_classes_attribute_start = cfs->current();
3563 inner_classes_attribute_length = attribute_length;
3564 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3565 } else if (tag == vmSymbols::tag_synthetic()) {
3566 // Check for Synthetic tag
3567 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3568 if (attribute_length != 0) {
3569 classfile_parse_error(
3570 "Invalid Synthetic classfile attribute length %u in class file %s",
3571 attribute_length, CHECK);
3572 }
3573 parse_classfile_synthetic_attribute(CHECK);
3574 } else if (tag == vmSymbols::tag_deprecated()) {
3575 // Check for Deprecatd tag - 4276120
3576 if (attribute_length != 0) {
3577 classfile_parse_error(
3578 "Invalid Deprecated classfile attribute length %u in class file %s",
3579 attribute_length, CHECK);
3580 }
3581 } else if (_major_version >= JAVA_1_5_VERSION) {
3582 if (tag == vmSymbols::tag_signature()) {
3583 if (_generic_signature_index != 0) {
3584 classfile_parse_error(
3585 "Multiple Signature attributes in class file %s", CHECK);
3586 }
3587 if (attribute_length != 2) {
3588 classfile_parse_error(
3589 "Wrong Signature attribute length %u in class file %s",
3590 attribute_length, CHECK);
3591 }
3592 parse_classfile_signature_attribute(cfs, CHECK);
3593 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3594 if (runtime_visible_annotations != NULL) {
3595 classfile_parse_error(
3596 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3597 }
3598 runtime_visible_annotations_length = attribute_length;
3599 runtime_visible_annotations = cfs->current();
3600 assert(runtime_visible_annotations != NULL, "null visible annotations");
3601 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3602 parse_annotations(cp,
3603 runtime_visible_annotations,
3604 runtime_visible_annotations_length,
3605 parsed_annotations,
3606 _loader_data,
3607 CHECK);
3608 cfs->skip_u1_fast(runtime_visible_annotations_length);
3609 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3610 if (runtime_invisible_annotations_exists) {
3611 classfile_parse_error(
3612 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3613 }
3614 runtime_invisible_annotations_exists = true;
3615 if (PreserveAllAnnotations) {
3616 runtime_invisible_annotations_length = attribute_length;
3617 runtime_invisible_annotations = cfs->current();
3618 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3619 }
3620 cfs->skip_u1(attribute_length, CHECK);
3621 } else if (tag == vmSymbols::tag_enclosing_method()) {
3622 if (parsed_enclosingmethod_attribute) {
3623 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3624 } else {
3625 parsed_enclosingmethod_attribute = true;
3626 }
3627 guarantee_property(attribute_length == 4,
3628 "Wrong EnclosingMethod attribute length %u in class file %s",
3629 attribute_length, CHECK);
3630 cfs->guarantee_more(4, CHECK); // class_index, method_index
3631 enclosing_method_class_index = cfs->get_u2_fast();
3632 enclosing_method_method_index = cfs->get_u2_fast();
3633 if (enclosing_method_class_index == 0) {
3634 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3635 }
3636 // Validate the constant pool indices and types
3637 check_property(valid_klass_reference_at(enclosing_method_class_index),
3638 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3639 if (enclosing_method_method_index != 0 &&
3640 (!cp->is_within_bounds(enclosing_method_method_index) ||
3641 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3642 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3643 }
3644 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3645 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3646 if (parsed_bootstrap_methods_attribute) {
3647 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3648 }
3649 parsed_bootstrap_methods_attribute = true;
3650 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3651 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3652 if (runtime_visible_type_annotations != NULL) {
3653 classfile_parse_error(
3654 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3655 }
3656 runtime_visible_type_annotations_length = attribute_length;
3657 runtime_visible_type_annotations = cfs->current();
3658 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3659 // No need for the VM to parse Type annotations
3660 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3661 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3662 if (runtime_invisible_type_annotations_exists) {
3663 classfile_parse_error(
3664 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3665 } else {
3666 runtime_invisible_type_annotations_exists = true;
3667 }
3668 if (PreserveAllAnnotations) {
3669 runtime_invisible_type_annotations_length = attribute_length;
3670 runtime_invisible_type_annotations = cfs->current();
3671 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3672 }
3673 cfs->skip_u1(attribute_length, CHECK);
3674 } else if (_major_version >= JAVA_11_VERSION) {
3675 if (tag == vmSymbols::tag_nest_members()) {
3676 // Check for NestMembers tag
3677 if (parsed_nest_members_attribute) {
3678 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK);
3679 } else {
3680 parsed_nest_members_attribute = true;
3681 }
3682 if (parsed_nest_host_attribute) {
3683 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK);
3684 }
3685 nest_members_attribute_start = cfs->current();
3686 nest_members_attribute_length = attribute_length;
3687 cfs->skip_u1(nest_members_attribute_length, CHECK);
3688 } else if (tag == vmSymbols::tag_nest_host()) {
3689 if (parsed_nest_host_attribute) {
3690 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK);
3691 } else {
3692 parsed_nest_host_attribute = true;
3693 }
3694 if (parsed_nest_members_attribute) {
3695 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK);
3696 }
3697 if (_need_verify) {
3698 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3699 }
3700 cfs->guarantee_more(2, CHECK);
3701 u2 class_info_index = cfs->get_u2_fast();
3702 check_property(
3703 valid_klass_reference_at(class_info_index),
3704 "Nest-host class_info_index %u has bad constant type in class file %s",
3705 class_info_index, CHECK);
3706 _nest_host = class_info_index;
3707 } else if (_major_version >= JAVA_14_VERSION) {
3708 if (tag == vmSymbols::tag_record()) {
3709 // Skip over Record attribute if not supported or if super class is
3710 // not java.lang.Record.
3711 if (supports_records() &&
3712 cp->klass_name_at(_super_class_index) == vmSymbols::java_lang_Record()) {
3713 if (parsed_record_attribute) {
3714 classfile_parse_error("Multiple Record attributes in class file %s", CHECK);
3715 }
3716 // Check that class is final and not abstract.
3717 if (!_access_flags.is_final() || _access_flags.is_abstract()) {
3718 classfile_parse_error("Record attribute in non-final or abstract class file %s", CHECK);
3719 }
3720 parsed_record_attribute = true;
3721 record_attribute_start = cfs->current();
3722 record_attribute_length = attribute_length;
3723 } else if (log_is_enabled(Info, class, record)) {
3724 // Log why the Record attribute was ignored. Note that if the
3725 // class file version is 58.65535 and --enable-preview wasn't
3726 // specified then a java.lang.UnsupportedClassVersionError
3727 // exception would have been thrown.
3728 ResourceMark rm(THREAD);
3729 log_info(class, record)("Ignoring Record attribute in class %s because %s",
3730 _class_name->as_C_string(),
3731 supports_records() ? "super type is not java.lang.Record" :
3732 "class file version is not 58.65535");
3733 }
3734 cfs->skip_u1(attribute_length, CHECK);
3735 } else {
3736 // Unknown attribute
3737 cfs->skip_u1(attribute_length, CHECK);
3738 }
3739 } else {
3740 // Unknown attribute
3741 cfs->skip_u1(attribute_length, CHECK);
3742 }
3743 } else {
3744 // Unknown attribute
3745 cfs->skip_u1(attribute_length, CHECK);
3746 }
3747 } else {
3748 // Unknown attribute
3749 cfs->skip_u1(attribute_length, CHECK);
3750 }
3751 }
3752 _class_annotations = assemble_annotations(runtime_visible_annotations,
3753 runtime_visible_annotations_length,
3754 runtime_invisible_annotations,
3755 runtime_invisible_annotations_length,
3756 CHECK);
3757 _class_type_annotations = assemble_annotations(runtime_visible_type_annotations,
3758 runtime_visible_type_annotations_length,
3759 runtime_invisible_type_annotations,
3760 runtime_invisible_type_annotations_length,
3761 CHECK);
3762
3763 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3764 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3765 cfs,
3766 inner_classes_attribute_start,
3767 parsed_innerclasses_attribute,
3768 enclosing_method_class_index,
3769 enclosing_method_method_index,
3770 CHECK);
3771 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3772 guarantee_property(
3773 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3774 "Wrong InnerClasses attribute length in class file %s", CHECK);
3775 }
3776 }
3777
3778 if (parsed_nest_members_attribute) {
3779 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3780 cfs,
3781 nest_members_attribute_start,
3782 CHECK);
3783 if (_need_verify) {
3784 guarantee_property(
3785 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3786 "Wrong NestMembers attribute length in class file %s", CHECK);
3787 }
3788 }
3789
3790 if (parsed_record_attribute) {
3791 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3792 cfs,
3793 cp,
3794 record_attribute_start,
3795 CHECK);
3796 if (_need_verify) {
3797 guarantee_property(record_attribute_length == calculated_attr_length,
3798 "Record attribute has wrong length in class file %s",
3799 CHECK);
3800 }
3801 }
3802
3803 if (_max_bootstrap_specifier_index >= 0) {
3804 guarantee_property(parsed_bootstrap_methods_attribute,
3805 "Missing BootstrapMethods attribute in class file %s", CHECK);
3806 }
3807 }
3808
3809 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3810 assert(k != NULL, "invariant");
3811
3812 if (_synthetic_flag)
3813 k->set_is_synthetic();
3814 if (_sourcefile_index != 0) {
3815 k->set_source_file_name_index(_sourcefile_index);
3816 }
3817 if (_generic_signature_index != 0) {
3818 k->set_generic_signature_index(_generic_signature_index);
3819 }
3820 if (_sde_buffer != NULL) {
3821 k->set_source_debug_extension(_sde_buffer, _sde_length);
3822 }
3823 }
3824
3825 // Create the Annotations object that will
3826 // hold the annotations array for the Klass.
3827 void ClassFileParser::create_combined_annotations(TRAPS) {
3828 if (_class_annotations == NULL &&
3829 _class_type_annotations == NULL &&
3830 _fields_annotations == NULL &&
3831 _fields_type_annotations == NULL) {
3832 // Don't create the Annotations object unnecessarily.
3833 return;
3834 }
3835
3836 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3837 annotations->set_class_annotations(_class_annotations);
3838 annotations->set_class_type_annotations(_class_type_annotations);
3839 annotations->set_fields_annotations(_fields_annotations);
3840 annotations->set_fields_type_annotations(_fields_type_annotations);
3841
3842 // This is the Annotations object that will be
3843 // assigned to InstanceKlass being constructed.
3844 _combined_annotations = annotations;
3845
3846 // The annotations arrays below has been transfered the
3847 // _combined_annotations so these fields can now be cleared.
3848 _class_annotations = NULL;
3849 _class_type_annotations = NULL;
3850 _fields_annotations = NULL;
3851 _fields_type_annotations = NULL;
3852 }
3853
3854 // Transfer ownership of metadata allocated to the InstanceKlass.
3855 void ClassFileParser::apply_parsed_class_metadata(
3856 InstanceKlass* this_klass,
3857 int java_fields_count,
3858 TRAPS) {
3859 assert(this_klass != NULL, "invariant");
3860
3861 _cp->set_pool_holder(this_klass);
3862 this_klass->set_constants(_cp);
3863 this_klass->set_fields(_fields, java_fields_count);
3864 this_klass->set_methods(_methods);
3865 this_klass->set_inner_classes(_inner_classes);
3866 this_klass->set_nest_members(_nest_members);
3867 this_klass->set_nest_host_index(_nest_host);
3868 this_klass->set_local_interfaces(_local_interfaces);
3869 this_klass->set_annotations(_combined_annotations);
3870 this_klass->set_record_components(_record_components);
3871 // Delay the setting of _transitive_interfaces until after initialize_supers() in
3872 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with
3873 // its _super. If an OOM occurs while loading the current klass, its _super field
3874 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3875 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3876 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3877
3878 // Clear out these fields so they don't get deallocated by the destructor
3879 clear_class_metadata();
3880 }
3881
3882 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3883 int runtime_visible_annotations_length,
3884 const u1* const runtime_invisible_annotations,
3885 int runtime_invisible_annotations_length,
3886 TRAPS) {
3887 AnnotationArray* annotations = NULL;
3888 if (runtime_visible_annotations != NULL ||
3889 runtime_invisible_annotations != NULL) {
3890 annotations = MetadataFactory::new_array<u1>(_loader_data,
3891 runtime_visible_annotations_length +
3892 runtime_invisible_annotations_length,
3893 CHECK_(annotations));
3894 if (runtime_visible_annotations != NULL) {
3895 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3896 annotations->at_put(i, runtime_visible_annotations[i]);
3897 }
3898 }
3899 if (runtime_invisible_annotations != NULL) {
3900 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3901 int append = runtime_visible_annotations_length+i;
3902 annotations->at_put(append, runtime_invisible_annotations[i]);
3903 }
3904 }
3905 }
3906 return annotations;
3907 }
3908
3909 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3910 const int super_class_index,
3911 const bool need_verify,
3912 TRAPS) {
3913 assert(cp != NULL, "invariant");
3914 const InstanceKlass* super_klass = NULL;
3915
3916 if (super_class_index == 0) {
3917 check_property(_class_name == vmSymbols::java_lang_Object(),
3918 "Invalid superclass index %u in class file %s",
3919 super_class_index,
3920 CHECK_NULL);
3921 } else {
3922 check_property(valid_klass_reference_at(super_class_index),
3923 "Invalid superclass index %u in class file %s",
3924 super_class_index,
3925 CHECK_NULL);
3926 // The class name should be legal because it is checked when parsing constant pool.
3927 // However, make sure it is not an array type.
3928 bool is_array = false;
3929 if (cp->tag_at(super_class_index).is_klass()) {
3930 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3931 if (need_verify)
3932 is_array = super_klass->is_array_klass();
3933 } else if (need_verify) {
3934 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3935 }
3936 if (need_verify) {
3937 guarantee_property(!is_array,
3938 "Bad superclass name in class file %s", CHECK_NULL);
3939 }
3940 }
3941 return super_klass;
3942 }
3943
3944 static unsigned int compute_oop_map_count(const InstanceKlass* super,
3945 unsigned int nonstatic_oop_map_count,
3946 int first_nonstatic_oop_offset) {
3947
3948 unsigned int map_count =
3949 NULL == super ? 0 : super->nonstatic_oop_map_count();
3950 if (nonstatic_oop_map_count > 0) {
3951 // We have oops to add to map
3952 if (map_count == 0) {
3953 map_count = nonstatic_oop_map_count;
3954 }
3955 else {
3956 // Check whether we should add a new map block or whether the last one can
3957 // be extended
3958 const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3959 const OopMapBlock* const last_map = first_map + map_count - 1;
3960
3961 const int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3962 if (next_offset == first_nonstatic_oop_offset) {
3963 // There is no gap bettwen superklass's last oop field and first
3964 // local oop field, merge maps.
3965 nonstatic_oop_map_count -= 1;
3966 }
3967 else {
3968 // Superklass didn't end with a oop field, add extra maps
3969 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3970 }
3971 map_count += nonstatic_oop_map_count;
3972 }
3973 }
3974 return map_count;
3975 }
3976
3977 #ifndef PRODUCT
3978 static void print_field_layout(const Symbol* name,
3979 Array<u2>* fields,
3980 ConstantPool* cp,
3981 int instance_size,
3982 int instance_fields_start,
3983 int instance_fields_end,
3984 int static_fields_end) {
3985
3986 assert(name != NULL, "invariant");
3987
3988 tty->print("%s: field layout\n", name->as_klass_external_name());
3989 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3990 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3991 if (!fs.access_flags().is_static()) {
3992 tty->print(" @%3d \"%s\" %s\n",
3993 fs.offset(),
3994 fs.name()->as_klass_external_name(),
3995 fs.signature()->as_klass_external_name());
3996 }
3997 }
3998 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3999 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4000 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4001 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4002 if (fs.access_flags().is_static()) {
4003 tty->print(" @%3d \"%s\" %s\n",
4004 fs.offset(),
4005 fs.name()->as_klass_external_name(),
4006 fs.signature()->as_klass_external_name());
4007 }
4008 }
4009 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4010 tty->print("\n");
4011 }
4012 #endif
4013
4014 // Values needed for oopmap and InstanceKlass creation
4015 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
4016 public:
4017 int* nonstatic_oop_offsets;
4018 unsigned int* nonstatic_oop_counts;
4019 unsigned int nonstatic_oop_map_count;
4020 unsigned int total_oop_map_count;
4021 int instance_size;
4022 int nonstatic_field_size;
4023 int static_field_size;
4024 bool has_nonstatic_fields;
4025 };
4026
4027 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
4028 void ClassFileParser::layout_fields(ConstantPool* cp,
4029 const FieldAllocationCount* fac,
4030 const ClassAnnotationCollector* parsed_annotations,
4031 FieldLayoutInfo* info,
4032 TRAPS) {
4033
4034 assert(cp != NULL, "invariant");
4035
4036 // Field size and offset computation
4037 int nonstatic_field_size = _super_klass == NULL ? 0 :
4038 _super_klass->nonstatic_field_size();
4039
4040 // Count the contended fields by type.
4041 //
4042 // We ignore static fields, because @Contended is not supported for them.
4043 // The layout code below will also ignore the static fields.
4044 int nonstatic_contended_count = 0;
4045 FieldAllocationCount fac_contended;
4046 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4047 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4048 if (fs.is_contended()) {
4049 fac_contended.count[atype]++;
4050 if (!fs.access_flags().is_static()) {
4051 nonstatic_contended_count++;
4052 }
4053 }
4054 }
4055
4056
4057 // Calculate the starting byte offsets
4058 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
4059 int next_static_double_offset = next_static_oop_offset +
4060 ((fac->count[STATIC_OOP]) * heapOopSize);
4061 if (fac->count[STATIC_DOUBLE]) {
4062 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
4063 }
4064
4065 int next_static_word_offset = next_static_double_offset +
4066 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
4067 int next_static_short_offset = next_static_word_offset +
4068 ((fac->count[STATIC_WORD]) * BytesPerInt);
4069 int next_static_byte_offset = next_static_short_offset +
4070 ((fac->count[STATIC_SHORT]) * BytesPerShort);
4071
4072 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
4073 nonstatic_field_size * heapOopSize;
4074
4075 int next_nonstatic_field_offset = nonstatic_fields_start;
4076
4077 const bool is_contended_class = parsed_annotations->is_contended();
4078
4079 // Class is contended, pad before all the fields
4080 if (is_contended_class) {
4081 next_nonstatic_field_offset += ContendedPaddingWidth;
4082 }
4083
4084 // Compute the non-contended fields count.
4085 // The packing code below relies on these counts to determine if some field
4086 // can be squeezed into the alignment gap. Contended fields are obviously
4087 // exempt from that.
4088 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
4089 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
4090 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
4091 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
4092 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
4093
4094 // Total non-static fields count, including every contended field
4095 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
4096 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
4097 fac->count[NONSTATIC_OOP];
4098
4099 const bool super_has_nonstatic_fields =
4100 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
4101 const bool has_nonstatic_fields =
4102 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
4103
4104
4105 // Prepare list of oops for oop map generation.
4106 //
4107 // "offset" and "count" lists are describing the set of contiguous oop
4108 // regions. offset[i] is the start of the i-th region, which then has
4109 // count[i] oops following. Before we know how many regions are required,
4110 // we pessimistically allocate the maps to fit all the oops into the
4111 // distinct regions.
4112 //
4113 // TODO: We add +1 to always allocate non-zero resource arrays; we need
4114 // to figure out if we still need to do this.
4115 unsigned int nonstatic_oop_map_count = 0;
4116 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
4117
4118 int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
4119 THREAD, int, max_nonstatic_oop_maps);
4120 unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
4121 THREAD, unsigned int, max_nonstatic_oop_maps);
4122
4123 int first_nonstatic_oop_offset = 0; // will be set for first oop field
4124
4125 bool compact_fields = CompactFields;
4126 int allocation_style = FieldsAllocationStyle;
4127 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
4128 assert(false, "0 <= FieldsAllocationStyle <= 2");
4129 allocation_style = 1; // Optimistic
4130 }
4131
4132 // The next classes have predefined hard-coded fields offsets
4133 // (see in JavaClasses::compute_hard_coded_offsets()).
4134 // Use default fields allocation order for them.
4135 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
4136 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
4137 _class_name == vmSymbols::java_lang_Class() ||
4138 _class_name == vmSymbols::java_lang_ClassLoader() ||
4139 _class_name == vmSymbols::java_lang_ref_Reference() ||
4140 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
4141 _class_name == vmSymbols::java_lang_StackTraceElement() ||
4142 _class_name == vmSymbols::java_lang_String() ||
4143 _class_name == vmSymbols::java_lang_Throwable() ||
4144 _class_name == vmSymbols::java_lang_Boolean() ||
4145 _class_name == vmSymbols::java_lang_Character() ||
4146 _class_name == vmSymbols::java_lang_Float() ||
4147 _class_name == vmSymbols::java_lang_Double() ||
4148 _class_name == vmSymbols::java_lang_Byte() ||
4149 _class_name == vmSymbols::java_lang_Short() ||
4150 _class_name == vmSymbols::java_lang_Integer() ||
4151 _class_name == vmSymbols::java_lang_Long())) {
4152 allocation_style = 0; // Allocate oops first
4153 compact_fields = false; // Don't compact fields
4154 }
4155
4156 int next_nonstatic_oop_offset = 0;
4157 int next_nonstatic_double_offset = 0;
4158
4159 // Rearrange fields for a given allocation style
4160 if( allocation_style == 0 ) {
4161 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
4162 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4163 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4164 (nonstatic_oop_count * heapOopSize);
4165 } else if( allocation_style == 1 ) {
4166 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
4167 next_nonstatic_double_offset = next_nonstatic_field_offset;
4168 } else if( allocation_style == 2 ) {
4169 // Fields allocation: oops fields in super and sub classes are together.
4170 if( nonstatic_field_size > 0 && _super_klass != NULL &&
4171 _super_klass->nonstatic_oop_map_size() > 0 ) {
4172 const unsigned int map_count = _super_klass->nonstatic_oop_map_count();
4173 const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps();
4174 const OopMapBlock* const last_map = first_map + map_count - 1;
4175 const int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
4176 if (next_offset == next_nonstatic_field_offset) {
4177 allocation_style = 0; // allocate oops first
4178 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4179 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4180 (nonstatic_oop_count * heapOopSize);
4181 }
4182 }
4183 if( allocation_style == 2 ) {
4184 allocation_style = 1; // allocate oops last
4185 next_nonstatic_double_offset = next_nonstatic_field_offset;
4186 }
4187 } else {
4188 ShouldNotReachHere();
4189 }
4190
4191 int nonstatic_oop_space_count = 0;
4192 int nonstatic_word_space_count = 0;
4193 int nonstatic_short_space_count = 0;
4194 int nonstatic_byte_space_count = 0;
4195 int nonstatic_oop_space_offset = 0;
4196 int nonstatic_word_space_offset = 0;
4197 int nonstatic_short_space_offset = 0;
4198 int nonstatic_byte_space_offset = 0;
4199
4200 // Try to squeeze some of the fields into the gaps due to
4201 // long/double alignment.
4202 if (nonstatic_double_count > 0) {
4203 int offset = next_nonstatic_double_offset;
4204 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
4205 if (compact_fields && offset != next_nonstatic_double_offset) {
4206 // Allocate available fields into the gap before double field.
4207 int length = next_nonstatic_double_offset - offset;
4208 assert(length == BytesPerInt, "");
4209 nonstatic_word_space_offset = offset;
4210 if (nonstatic_word_count > 0) {
4211 nonstatic_word_count -= 1;
4212 nonstatic_word_space_count = 1; // Only one will fit
4213 length -= BytesPerInt;
4214 offset += BytesPerInt;
4215 }
4216 nonstatic_short_space_offset = offset;
4217 while (length >= BytesPerShort && nonstatic_short_count > 0) {
4218 nonstatic_short_count -= 1;
4219 nonstatic_short_space_count += 1;
4220 length -= BytesPerShort;
4221 offset += BytesPerShort;
4222 }
4223 nonstatic_byte_space_offset = offset;
4224 while (length > 0 && nonstatic_byte_count > 0) {
4225 nonstatic_byte_count -= 1;
4226 nonstatic_byte_space_count += 1;
4227 length -= 1;
4228 }
4229 // Allocate oop field in the gap if there are no other fields for that.
4230 nonstatic_oop_space_offset = offset;
4231 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
4232 allocation_style != 0) { // when oop fields not first
4233 nonstatic_oop_count -= 1;
4234 nonstatic_oop_space_count = 1; // Only one will fit
4235 length -= heapOopSize;
4236 offset += heapOopSize;
4237 }
4238 }
4239 }
4240
4241 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4242 (nonstatic_double_count * BytesPerLong);
4243 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4244 (nonstatic_word_count * BytesPerInt);
4245 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4246 (nonstatic_short_count * BytesPerShort);
4247 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4248 nonstatic_byte_count;
4249
4250 // let oops jump before padding with this allocation style
4251 if( allocation_style == 1 ) {
4252 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4253 if( nonstatic_oop_count > 0 ) {
4254 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4255 }
4256 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4257 }
4258
4259 // Iterate over fields again and compute correct offsets.
4260 // The field allocation type was temporarily stored in the offset slot.
4261 // oop fields are located before non-oop fields (static and non-static).
4262 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4263
4264 // skip already laid out fields
4265 if (fs.is_offset_set()) continue;
4266
4267 // contended instance fields are handled below
4268 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4269
4270 int real_offset = 0;
4271 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4272
4273 // pack the rest of the fields
4274 switch (atype) {
4275 case STATIC_OOP:
4276 real_offset = next_static_oop_offset;
4277 next_static_oop_offset += heapOopSize;
4278 break;
4279 case STATIC_BYTE:
4280 real_offset = next_static_byte_offset;
4281 next_static_byte_offset += 1;
4282 break;
4283 case STATIC_SHORT:
4284 real_offset = next_static_short_offset;
4285 next_static_short_offset += BytesPerShort;
4286 break;
4287 case STATIC_WORD:
4288 real_offset = next_static_word_offset;
4289 next_static_word_offset += BytesPerInt;
4290 break;
4291 case STATIC_DOUBLE:
4292 real_offset = next_static_double_offset;
4293 next_static_double_offset += BytesPerLong;
4294 break;
4295 case NONSTATIC_OOP:
4296 if( nonstatic_oop_space_count > 0 ) {
4297 real_offset = nonstatic_oop_space_offset;
4298 nonstatic_oop_space_offset += heapOopSize;
4299 nonstatic_oop_space_count -= 1;
4300 } else {
4301 real_offset = next_nonstatic_oop_offset;
4302 next_nonstatic_oop_offset += heapOopSize;
4303 }
4304
4305 // Record this oop in the oop maps
4306 if( nonstatic_oop_map_count > 0 &&
4307 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4308 real_offset -
4309 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4310 heapOopSize ) {
4311 // This oop is adjacent to the previous one, add to current oop map
4312 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4313 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4314 } else {
4315 // This oop is not adjacent to the previous one, create new oop map
4316 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4317 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4318 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4319 nonstatic_oop_map_count += 1;
4320 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4321 first_nonstatic_oop_offset = real_offset;
4322 }
4323 }
4324 break;
4325 case NONSTATIC_BYTE:
4326 if( nonstatic_byte_space_count > 0 ) {
4327 real_offset = nonstatic_byte_space_offset;
4328 nonstatic_byte_space_offset += 1;
4329 nonstatic_byte_space_count -= 1;
4330 } else {
4331 real_offset = next_nonstatic_byte_offset;
4332 next_nonstatic_byte_offset += 1;
4333 }
4334 break;
4335 case NONSTATIC_SHORT:
4336 if( nonstatic_short_space_count > 0 ) {
4337 real_offset = nonstatic_short_space_offset;
4338 nonstatic_short_space_offset += BytesPerShort;
4339 nonstatic_short_space_count -= 1;
4340 } else {
4341 real_offset = next_nonstatic_short_offset;
4342 next_nonstatic_short_offset += BytesPerShort;
4343 }
4344 break;
4345 case NONSTATIC_WORD:
4346 if( nonstatic_word_space_count > 0 ) {
4347 real_offset = nonstatic_word_space_offset;
4348 nonstatic_word_space_offset += BytesPerInt;
4349 nonstatic_word_space_count -= 1;
4350 } else {
4351 real_offset = next_nonstatic_word_offset;
4352 next_nonstatic_word_offset += BytesPerInt;
4353 }
4354 break;
4355 case NONSTATIC_DOUBLE:
4356 real_offset = next_nonstatic_double_offset;
4357 next_nonstatic_double_offset += BytesPerLong;
4358 break;
4359 default:
4360 ShouldNotReachHere();
4361 }
4362 fs.set_offset(real_offset);
4363 }
4364
4365
4366 // Handle the contended cases.
4367 //
4368 // Each contended field should not intersect the cache line with another contended field.
4369 // In the absence of alignment information, we end up with pessimistically separating
4370 // the fields with full-width padding.
4371 //
4372 // Additionally, this should not break alignment for the fields, so we round the alignment up
4373 // for each field.
4374 if (nonstatic_contended_count > 0) {
4375
4376 // if there is at least one contended field, we need to have pre-padding for them
4377 next_nonstatic_padded_offset += ContendedPaddingWidth;
4378
4379 // collect all contended groups
4380 ResourceBitMap bm(cp->size());
4381 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4382 // skip already laid out fields
4383 if (fs.is_offset_set()) continue;
4384
4385 if (fs.is_contended()) {
4386 bm.set_bit(fs.contended_group());
4387 }
4388 }
4389
4390 int current_group = -1;
4391 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4392
4393 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4394
4395 // skip already laid out fields
4396 if (fs.is_offset_set()) continue;
4397
4398 // skip non-contended fields and fields from different group
4399 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4400
4401 // handle statics below
4402 if (fs.access_flags().is_static()) continue;
4403
4404 int real_offset = 0;
4405 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4406
4407 switch (atype) {
4408 case NONSTATIC_BYTE:
4409 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4410 real_offset = next_nonstatic_padded_offset;
4411 next_nonstatic_padded_offset += 1;
4412 break;
4413
4414 case NONSTATIC_SHORT:
4415 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4416 real_offset = next_nonstatic_padded_offset;
4417 next_nonstatic_padded_offset += BytesPerShort;
4418 break;
4419
4420 case NONSTATIC_WORD:
4421 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4422 real_offset = next_nonstatic_padded_offset;
4423 next_nonstatic_padded_offset += BytesPerInt;
4424 break;
4425
4426 case NONSTATIC_DOUBLE:
4427 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4428 real_offset = next_nonstatic_padded_offset;
4429 next_nonstatic_padded_offset += BytesPerLong;
4430 break;
4431
4432 case NONSTATIC_OOP:
4433 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4434 real_offset = next_nonstatic_padded_offset;
4435 next_nonstatic_padded_offset += heapOopSize;
4436
4437 // Record this oop in the oop maps
4438 if( nonstatic_oop_map_count > 0 &&
4439 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4440 real_offset -
4441 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4442 heapOopSize ) {
4443 // This oop is adjacent to the previous one, add to current oop map
4444 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4445 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4446 } else {
4447 // This oop is not adjacent to the previous one, create new oop map
4448 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4449 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4450 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4451 nonstatic_oop_map_count += 1;
4452 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4453 first_nonstatic_oop_offset = real_offset;
4454 }
4455 }
4456 break;
4457
4458 default:
4459 ShouldNotReachHere();
4460 }
4461
4462 if (fs.contended_group() == 0) {
4463 // Contended group defines the equivalence class over the fields:
4464 // the fields within the same contended group are not inter-padded.
4465 // The only exception is default group, which does not incur the
4466 // equivalence, and so requires intra-padding.
4467 next_nonstatic_padded_offset += ContendedPaddingWidth;
4468 }
4469
4470 fs.set_offset(real_offset);
4471 } // for
4472
4473 // Start laying out the next group.
4474 // Note that this will effectively pad the last group in the back;
4475 // this is expected to alleviate memory contention effects for
4476 // subclass fields and/or adjacent object.
4477 // If this was the default group, the padding is already in place.
4478 if (current_group != 0) {
4479 next_nonstatic_padded_offset += ContendedPaddingWidth;
4480 }
4481 }
4482
4483 // handle static fields
4484 }
4485
4486 // Entire class is contended, pad in the back.
4487 // This helps to alleviate memory contention effects for subclass fields
4488 // and/or adjacent object.
4489 if (is_contended_class) {
4490 next_nonstatic_padded_offset += ContendedPaddingWidth;
4491 }
4492
4493 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4494
4495 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize);
4496 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4497 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4498
4499 int static_field_size = (static_fields_end -
4500 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4501 nonstatic_field_size = nonstatic_field_size +
4502 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4503
4504 int instance_size = align_object_size(instance_end / wordSize);
4505
4506 assert(instance_size == align_object_size(align_up(
4507 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
4508 wordSize) / wordSize), "consistent layout helper value");
4509
4510 // Invariant: nonstatic_field end/start should only change if there are
4511 // nonstatic fields in the class, or if the class is contended. We compare
4512 // against the non-aligned value, so that end alignment will not fail the
4513 // assert without actually having the fields.
4514 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4515 is_contended_class ||
4516 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4517
4518 // Number of non-static oop map blocks allocated at end of klass.
4519 const unsigned int total_oop_map_count =
4520 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
4521 first_nonstatic_oop_offset);
4522
4523 #ifndef PRODUCT
4524 if (PrintFieldLayout) {
4525 print_field_layout(_class_name,
4526 _fields,
4527 cp,
4528 instance_size,
4529 nonstatic_fields_start,
4530 nonstatic_fields_end,
4531 static_fields_end);
4532 }
4533
4534 #endif
4535 // Pass back information needed for InstanceKlass creation
4536 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
4537 info->nonstatic_oop_counts = nonstatic_oop_counts;
4538 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
4539 info->total_oop_map_count = total_oop_map_count;
4540 info->instance_size = instance_size;
4541 info->static_field_size = static_field_size;
4542 info->nonstatic_field_size = nonstatic_field_size;
4543 info->has_nonstatic_fields = has_nonstatic_fields;
4544 }
4545
4546 static void fill_oop_maps(const InstanceKlass* k,
4547 unsigned int nonstatic_oop_map_count,
4548 const int* nonstatic_oop_offsets,
4549 const unsigned int* nonstatic_oop_counts) {
4550
4551 assert(k != NULL, "invariant");
4552
4553 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4554 const InstanceKlass* const super = k->superklass();
4555 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4556 if (super_count > 0) {
4557 // Copy maps from superklass
4558 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4559 for (unsigned int i = 0; i < super_count; ++i) {
4560 *this_oop_map++ = *super_oop_map++;
4561 }
4562 }
4563
4564 if (nonstatic_oop_map_count > 0) {
4565 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4566 // The counts differ because there is no gap between superklass's last oop
4567 // field and the first local oop field. Extend the last oop map copied
4568 // from the superklass instead of creating new one.
4569 nonstatic_oop_map_count--;
4570 nonstatic_oop_offsets++;
4571 this_oop_map--;
4572 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4573 this_oop_map++;
4574 }
4575
4576 // Add new map blocks, fill them
4577 while (nonstatic_oop_map_count-- > 0) {
4578 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4579 this_oop_map->set_count(*nonstatic_oop_counts++);
4580 this_oop_map++;
4581 }
4582 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4583 this_oop_map, "sanity");
4584 }
4585 }
4586
4587
4588 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4589 assert(ik != NULL, "invariant");
4590
4591 const Klass* const super = ik->super();
4592
4593 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4594 // in which case we don't have to register objects as finalizable
4595 if (!_has_empty_finalizer) {
4596 if (_has_finalizer ||
4597 (super != NULL && super->has_finalizer())) {
4598 ik->set_has_finalizer();
4599 }
4600 }
4601
4602 #ifdef ASSERT
4603 bool f = false;
4604 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4605 vmSymbols::void_method_signature());
4606 if (m != NULL && !m->is_empty_method()) {
4607 f = true;
4608 }
4609
4610 // Spec doesn't prevent agent from redefinition of empty finalizer.
4611 // Despite the fact that it's generally bad idea and redefined finalizer
4612 // will not work as expected we shouldn't abort vm in this case
4613 if (!ik->has_redefined_this_or_super()) {
4614 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4615 }
4616 #endif
4617
4618 // Check if this klass supports the java.lang.Cloneable interface
4619 if (SystemDictionary::Cloneable_klass_loaded()) {
4620 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4621 ik->set_is_cloneable();
4622 }
4623 }
4624
4625 // Check if this klass has a vanilla default constructor
4626 if (super == NULL) {
4627 // java.lang.Object has empty default constructor
4628 ik->set_has_vanilla_constructor();
4629 } else {
4630 if (super->has_vanilla_constructor() &&
4631 _has_vanilla_constructor) {
4632 ik->set_has_vanilla_constructor();
4633 }
4634 #ifdef ASSERT
4635 bool v = false;
4636 if (super->has_vanilla_constructor()) {
4637 const Method* const constructor =
4638 ik->find_method(vmSymbols::object_initializer_name(),
4639 vmSymbols::void_method_signature());
4640 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4641 v = true;
4642 }
4643 }
4644 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4645 #endif
4646 }
4647
4648 // If it cannot be fast-path allocated, set a bit in the layout helper.
4649 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4650 assert(ik->size_helper() > 0, "layout_helper is initialized");
4651 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4652 || ik->is_abstract() || ik->is_interface()
4653 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4654 || ik->size_helper() >= FastAllocateSizeLimit) {
4655 // Forbid fast-path allocation.
4656 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4657 ik->set_layout_helper(lh);
4658 }
4659 }
4660
4661 // utility methods for appending an array with check for duplicates
4662
4663 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4664 const Array<InstanceKlass*>* const ifs) {
4665 // iterate over new interfaces
4666 for (int i = 0; i < ifs->length(); i++) {
4667 InstanceKlass* const e = ifs->at(i);
4668 assert(e->is_klass() && e->is_interface(), "just checking");
4669 // add new interface
4670 result->append_if_missing(e);
4671 }
4672 }
4673
4674 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4675 Array<InstanceKlass*>* local_ifs,
4676 ClassLoaderData* loader_data,
4677 TRAPS) {
4678 assert(local_ifs != NULL, "invariant");
4679 assert(loader_data != NULL, "invariant");
4680
4681 // Compute maximum size for transitive interfaces
4682 int max_transitive_size = 0;
4683 int super_size = 0;
4684 // Add superclass transitive interfaces size
4685 if (super != NULL) {
4686 super_size = super->transitive_interfaces()->length();
4687 max_transitive_size += super_size;
4688 }
4689 // Add local interfaces' super interfaces
4690 const int local_size = local_ifs->length();
4691 for (int i = 0; i < local_size; i++) {
4692 InstanceKlass* const l = local_ifs->at(i);
4693 max_transitive_size += l->transitive_interfaces()->length();
4694 }
4695 // Finally add local interfaces
4696 max_transitive_size += local_size;
4697 // Construct array
4698 if (max_transitive_size == 0) {
4699 // no interfaces, use canonicalized array
4700 return Universe::the_empty_instance_klass_array();
4701 } else if (max_transitive_size == super_size) {
4702 // no new local interfaces added, share superklass' transitive interface array
4703 return super->transitive_interfaces();
4704 } else if (max_transitive_size == local_size) {
4705 // only local interfaces added, share local interface array
4706 return local_ifs;
4707 } else {
4708 ResourceMark rm;
4709 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4710
4711 // Copy down from superclass
4712 if (super != NULL) {
4713 append_interfaces(result, super->transitive_interfaces());
4714 }
4715
4716 // Copy down from local interfaces' superinterfaces
4717 for (int i = 0; i < local_size; i++) {
4718 InstanceKlass* const l = local_ifs->at(i);
4719 append_interfaces(result, l->transitive_interfaces());
4720 }
4721 // Finally add local interfaces
4722 append_interfaces(result, local_ifs);
4723
4724 // length will be less than the max_transitive_size if duplicates were removed
4725 const int length = result->length();
4726 assert(length <= max_transitive_size, "just checking");
4727 Array<InstanceKlass*>* const new_result =
4728 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4729 for (int i = 0; i < length; i++) {
4730 InstanceKlass* const e = result->at(i);
4731 assert(e != NULL, "just checking");
4732 new_result->at_put(i, e);
4733 }
4734 return new_result;
4735 }
4736 }
4737
4738 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4739 assert(this_klass != NULL, "invariant");
4740 const Klass* const super = this_klass->super();
4741
4742 if (super != NULL) {
4743
4744 // If the loader is not the boot loader then throw an exception if its
4745 // superclass is in package jdk.internal.reflect and its loader is not a
4746 // special reflection class loader
4747 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4748 assert(super->is_instance_klass(), "super is not instance klass");
4749 PackageEntry* super_package = super->package();
4750 if (super_package != NULL &&
4751 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4752 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4753 ResourceMark rm(THREAD);
4754 Exceptions::fthrow(
4755 THREAD_AND_LOCATION,
4756 vmSymbols::java_lang_IllegalAccessError(),
4757 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4758 this_klass->external_name(),
4759 this_klass->class_loader_data()->loader_name_and_id(),
4760 super->external_name());
4761 return;
4762 }
4763 }
4764
4765 Reflection::VerifyClassAccessResults vca_result =
4766 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4767 if (vca_result != Reflection::ACCESS_OK) {
4768 ResourceMark rm(THREAD);
4769 char* msg = Reflection::verify_class_access_msg(this_klass,
4770 InstanceKlass::cast(super),
4771 vca_result);
4772 if (msg == NULL) {
4773 bool same_module = (this_klass->module() == super->module());
4774 Exceptions::fthrow(
4775 THREAD_AND_LOCATION,
4776 vmSymbols::java_lang_IllegalAccessError(),
4777 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4778 this_klass->external_name(),
4779 super->is_abstract() ? "abstract " : "",
4780 super->external_name(),
4781 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4782 (same_module) ? "" : "; ",
4783 (same_module) ? "" : super->class_in_module_of_loader());
4784 } else {
4785 // Add additional message content.
4786 Exceptions::fthrow(
4787 THREAD_AND_LOCATION,
4788 vmSymbols::java_lang_IllegalAccessError(),
4789 "superclass access check failed: %s",
4790 msg);
4791 }
4792 }
4793 }
4794 }
4795
4796
4797 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4798 assert(this_klass != NULL, "invariant");
4799 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4800 const int lng = local_interfaces->length();
4801 for (int i = lng - 1; i >= 0; i--) {
4802 InstanceKlass* const k = local_interfaces->at(i);
4803 assert (k != NULL && k->is_interface(), "invalid interface");
4804 Reflection::VerifyClassAccessResults vca_result =
4805 Reflection::verify_class_access(this_klass, k, false);
4806 if (vca_result != Reflection::ACCESS_OK) {
4807 ResourceMark rm(THREAD);
4808 char* msg = Reflection::verify_class_access_msg(this_klass,
4809 k,
4810 vca_result);
4811 if (msg == NULL) {
4812 bool same_module = (this_klass->module() == k->module());
4813 Exceptions::fthrow(
4814 THREAD_AND_LOCATION,
4815 vmSymbols::java_lang_IllegalAccessError(),
4816 "class %s cannot access its superinterface %s (%s%s%s)",
4817 this_klass->external_name(),
4818 k->external_name(),
4819 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4820 (same_module) ? "" : "; ",
4821 (same_module) ? "" : k->class_in_module_of_loader());
4822 } else {
4823 // Add additional message content.
4824 Exceptions::fthrow(
4825 THREAD_AND_LOCATION,
4826 vmSymbols::java_lang_IllegalAccessError(),
4827 "superinterface check failed: %s",
4828 msg);
4829 }
4830 }
4831 }
4832 }
4833
4834
4835 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4836 assert(this_klass != NULL, "invariant");
4837 const Array<Method*>* const methods = this_klass->methods();
4838 const int num_methods = methods->length();
4839
4840 // go thru each method and check if it overrides a final method
4841 for (int index = 0; index < num_methods; index++) {
4842 const Method* const m = methods->at(index);
4843
4844 // skip private, static, and <init> methods
4845 if ((!m->is_private() && !m->is_static()) &&
4846 (m->name() != vmSymbols::object_initializer_name())) {
4847
4848 const Symbol* const name = m->name();
4849 const Symbol* const signature = m->signature();
4850 const Klass* k = this_klass->super();
4851 const Method* super_m = NULL;
4852 while (k != NULL) {
4853 // skip supers that don't have final methods.
4854 if (k->has_final_method()) {
4855 // lookup a matching method in the super class hierarchy
4856 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4857 if (super_m == NULL) {
4858 break; // didn't find any match; get out
4859 }
4860
4861 if (super_m->is_final() && !super_m->is_static() &&
4862 !super_m->access_flags().is_private()) {
4863 // matching method in super is final, and not static or private
4864 bool can_access = Reflection::verify_member_access(this_klass,
4865 super_m->method_holder(),
4866 super_m->method_holder(),
4867 super_m->access_flags(),
4868 false, false, CHECK);
4869 if (can_access) {
4870 // this class can access super final method and therefore override
4871 ResourceMark rm(THREAD);
4872 Exceptions::fthrow(THREAD_AND_LOCATION,
4873 vmSymbols::java_lang_VerifyError(),
4874 "class %s overrides final method %s.%s%s",
4875 this_klass->external_name(),
4876 super_m->method_holder()->external_name(),
4877 name->as_C_string(),
4878 signature->as_C_string()
4879 );
4880 return;
4881 }
4882 }
4883
4884 // continue to look from super_m's holder's super.
4885 k = super_m->method_holder()->super();
4886 continue;
4887 }
4888
4889 k = k->super();
4890 }
4891 }
4892 }
4893 }
4894
4895
4896 // assumes that this_klass is an interface
4897 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4898 assert(this_klass != NULL, "invariant");
4899 assert(this_klass->is_interface(), "not an interface");
4900 const Array<Method*>* methods = this_klass->methods();
4901 const int num_methods = methods->length();
4902
4903 for (int index = 0; index < num_methods; index++) {
4904 const Method* const m = methods->at(index);
4905 // if m is static and not the init method, throw a verify error
4906 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4907 ResourceMark rm(THREAD);
4908 Exceptions::fthrow(
4909 THREAD_AND_LOCATION,
4910 vmSymbols::java_lang_VerifyError(),
4911 "Illegal static method %s in interface %s",
4912 m->name()->as_C_string(),
4913 this_klass->external_name()
4914 );
4915 return;
4916 }
4917 }
4918 }
4919
4920 // utility methods for format checking
4921
4922 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4923 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4924 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4925 if (is_module) {
4926 ResourceMark rm(THREAD);
4927 Exceptions::fthrow(
4928 THREAD_AND_LOCATION,
4929 vmSymbols::java_lang_NoClassDefFoundError(),
4930 "%s is not a class because access_flag ACC_MODULE is set",
4931 _class_name->as_C_string());
4932 return;
4933 }
4934
4935 if (!_need_verify) { return; }
4936
4937 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4938 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4939 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4940 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4941 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4942 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4943 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4944 const bool major_gte_14 = _major_version >= JAVA_14_VERSION;
4945
4946 if ((is_abstract && is_final) ||
4947 (is_interface && !is_abstract) ||
4948 (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
4949 (!is_interface && major_gte_1_5 && is_annotation)) {
4950 ResourceMark rm(THREAD);
4951 Exceptions::fthrow(
4952 THREAD_AND_LOCATION,
4953 vmSymbols::java_lang_ClassFormatError(),
4954 "Illegal class modifiers in class %s: 0x%X",
4955 _class_name->as_C_string(), flags
4956 );
4957 return;
4958 }
4959 }
4960
4961 static bool has_illegal_visibility(jint flags) {
4962 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4963 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4964 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4965
4966 return ((is_public && is_protected) ||
4967 (is_public && is_private) ||
4968 (is_protected && is_private));
4969 }
4970
4971 // A legal major_version.minor_version must be one of the following:
4972 //
4973 // Major_version >= 45 and major_version < 56, any minor_version.
4974 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4975 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4976 //
4977 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4978 ResourceMark rm(THREAD);
4979 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4980 if (major < JAVA_MIN_SUPPORTED_VERSION) {
4981 Exceptions::fthrow(
4982 THREAD_AND_LOCATION,
4983 vmSymbols::java_lang_UnsupportedClassVersionError(),
4984 "%s (class file version %u.%u) was compiled with an invalid major version",
4985 class_name->as_C_string(), major, minor);
4986 return;
4987 }
4988
4989 if (major > max_version) {
4990 Exceptions::fthrow(
4991 THREAD_AND_LOCATION,
4992 vmSymbols::java_lang_UnsupportedClassVersionError(),
4993 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4994 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4995 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4996 return;
4997 }
4998
4999 if (major < JAVA_12_VERSION || minor == 0) {
5000 return;
5001 }
5002
5003 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
5004 if (major != max_version) {
5005 Exceptions::fthrow(
5006 THREAD_AND_LOCATION,
5007 vmSymbols::java_lang_UnsupportedClassVersionError(),
5008 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
5009 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
5010 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
5011 return;
5012 }
5013
5014 if (!Arguments::enable_preview()) {
5015 Exceptions::fthrow(
5016 THREAD_AND_LOCATION,
5017 vmSymbols::java_lang_UnsupportedClassVersionError(),
5018 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
5019 class_name->as_C_string(), major, minor);
5020 return;
5021 }
5022
5023 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
5024 Exceptions::fthrow(
5025 THREAD_AND_LOCATION,
5026 vmSymbols::java_lang_UnsupportedClassVersionError(),
5027 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
5028 class_name->as_C_string(), major, minor);
5029 }
5030 }
5031
5032 void ClassFileParser::verify_legal_field_modifiers(jint flags,
5033 bool is_interface,
5034 TRAPS) const {
5035 if (!_need_verify) { return; }
5036
5037 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5038 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5039 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5040 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5041 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5042 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
5043 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
5044 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5045 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
5046
5047 bool is_illegal = false;
5048
5049 if (is_interface) {
5050 if (!is_public || !is_static || !is_final || is_private ||
5051 is_protected || is_volatile || is_transient ||
5052 (major_gte_1_5 && is_enum)) {
5053 is_illegal = true;
5054 }
5055 } else { // not interface
5056 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
5057 is_illegal = true;
5058 }
5059 }
5060
5061 if (is_illegal) {
5062 ResourceMark rm(THREAD);
5063 Exceptions::fthrow(
5064 THREAD_AND_LOCATION,
5065 vmSymbols::java_lang_ClassFormatError(),
5066 "Illegal field modifiers in class %s: 0x%X",
5067 _class_name->as_C_string(), flags);
5068 return;
5069 }
5070 }
5071
5072 void ClassFileParser::verify_legal_method_modifiers(jint flags,
5073 bool is_interface,
5074 const Symbol* name,
5075 TRAPS) const {
5076 if (!_need_verify) { return; }
5077
5078 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5079 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5080 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5081 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5082 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
5083 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5084 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
5085 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
5086 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
5087 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5088 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
5089 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
5090 const bool is_initializer = (name == vmSymbols::object_initializer_name());
5091
5092 bool is_illegal = false;
5093
5094 if (is_interface) {
5095 if (major_gte_8) {
5096 // Class file version is JAVA_8_VERSION or later Methods of
5097 // interfaces may set any of the flags except ACC_PROTECTED,
5098 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5099 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5100 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5101 (is_native || is_protected || is_final || is_synchronized) ||
5102 // If a specific method of a class or interface has its
5103 // ACC_ABSTRACT flag set, it must not have any of its
5104 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5105 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
5106 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5107 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5108 (is_abstract && (is_private || is_static || is_strict))) {
5109 is_illegal = true;
5110 }
5111 } else if (major_gte_1_5) {
5112 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5113 if (!is_public || is_private || is_protected || is_static || is_final ||
5114 is_synchronized || is_native || !is_abstract || is_strict) {
5115 is_illegal = true;
5116 }
5117 } else {
5118 // Class file version is pre-JAVA_1_5_VERSION
5119 if (!is_public || is_static || is_final || is_native || !is_abstract) {
5120 is_illegal = true;
5121 }
5122 }
5123 } else { // not interface
5124 if (has_illegal_visibility(flags)) {
5125 is_illegal = true;
5126 } else {
5127 if (is_initializer) {
5128 if (is_static || is_final || is_synchronized || is_native ||
5129 is_abstract || (major_gte_1_5 && is_bridge)) {
5130 is_illegal = true;
5131 }
5132 } else { // not initializer
5133 if (is_abstract) {
5134 if ((is_final || is_native || is_private || is_static ||
5135 (major_gte_1_5 && (is_synchronized || is_strict)))) {
5136 is_illegal = true;
5137 }
5138 }
5139 }
5140 }
5141 }
5142
5143 if (is_illegal) {
5144 ResourceMark rm(THREAD);
5145 Exceptions::fthrow(
5146 THREAD_AND_LOCATION,
5147 vmSymbols::java_lang_ClassFormatError(),
5148 "Method %s in class %s has illegal modifiers: 0x%X",
5149 name->as_C_string(), _class_name->as_C_string(), flags);
5150 return;
5151 }
5152 }
5153
5154 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5155 int length,
5156 TRAPS) const {
5157 assert(_need_verify, "only called when _need_verify is true");
5158 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5159 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5160 }
5161 }
5162
5163 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5164 // In class names, '/' separates unqualified names. This is verified in this function also.
5165 // Method names also may not contain the characters '<' or '>', unless <init>
5166 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5167 // method. Because these names have been checked as special cases before
5168 // calling this method in verify_legal_method_name.
5169 //
5170 // This method is also called from the modular system APIs in modules.cpp
5171 // to verify the validity of module and package names.
5172 bool ClassFileParser::verify_unqualified_name(const char* name,
5173 unsigned int length,
5174 int type) {
5175 if (length == 0) return false; // Must have at least one char.
5176 for (const char* p = name; p != name + length; p++) {
5177 switch(*p) {
5178 case JVM_SIGNATURE_DOT:
5179 case JVM_SIGNATURE_ENDCLASS:
5180 case JVM_SIGNATURE_ARRAY:
5181 // do not permit '.', ';', or '['
5182 return false;
5183 case JVM_SIGNATURE_SLASH:
5184 // check for '//' or leading or trailing '/' which are not legal
5185 // unqualified name must not be empty
5186 if (type == ClassFileParser::LegalClass) {
5187 if (p == name || p+1 >= name+length ||
5188 *(p+1) == JVM_SIGNATURE_SLASH) {
5189 return false;
5190 }
5191 } else {
5192 return false; // do not permit '/' unless it's class name
5193 }
5194 break;
5195 case JVM_SIGNATURE_SPECIAL:
5196 case JVM_SIGNATURE_ENDSPECIAL:
5197 // do not permit '<' or '>' in method names
5198 if (type == ClassFileParser::LegalMethod) {
5199 return false;
5200 }
5201 }
5202 }
5203 return true;
5204 }
5205
5206 // Take pointer to a UTF8 byte string (not NUL-terminated).
5207 // Skip over the longest part of the string that could
5208 // be taken as a fieldname. Allow '/' if slash_ok is true.
5209 // Return a pointer to just past the fieldname.
5210 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5211 // being true, we saw consecutive slashes (meaning we were looking for a
5212 // qualified path but found something that was badly-formed).
5213 static const char* skip_over_field_name(const char* const name,
5214 bool slash_ok,
5215 unsigned int length) {
5216 const char* p;
5217 jboolean last_is_slash = false;
5218 jboolean not_first_ch = false;
5219
5220 for (p = name; p != name + length; not_first_ch = true) {
5221 const char* old_p = p;
5222 jchar ch = *p;
5223 if (ch < 128) {
5224 p++;
5225 // quick check for ascii
5226 if ((ch >= 'a' && ch <= 'z') ||
5227 (ch >= 'A' && ch <= 'Z') ||
5228 (ch == '_' || ch == '$') ||
5229 (not_first_ch && ch >= '0' && ch <= '9')) {
5230 last_is_slash = false;
5231 continue;
5232 }
5233 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
5234 if (last_is_slash) {
5235 return NULL; // Don't permit consecutive slashes
5236 }
5237 last_is_slash = true;
5238 continue;
5239 }
5240 }
5241 else {
5242 jint unicode_ch;
5243 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5244 p = tmp_p;
5245 last_is_slash = false;
5246 // Check if ch is Java identifier start or is Java identifier part
5247 // 4672820: call java.lang.Character methods directly without generating separate tables.
5248 EXCEPTION_MARK;
5249 // return value
5250 JavaValue result(T_BOOLEAN);
5251 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
5252 JavaCallArguments args;
5253 args.push_int(unicode_ch);
5254
5255 if (not_first_ch) {
5256 // public static boolean isJavaIdentifierPart(char ch);
5257 JavaCalls::call_static(&result,
5258 SystemDictionary::Character_klass(),
5259 vmSymbols::isJavaIdentifierPart_name(),
5260 vmSymbols::int_bool_signature(),
5261 &args,
5262 THREAD);
5263 } else {
5264 // public static boolean isJavaIdentifierStart(char ch);
5265 JavaCalls::call_static(&result,
5266 SystemDictionary::Character_klass(),
5267 vmSymbols::isJavaIdentifierStart_name(),
5268 vmSymbols::int_bool_signature(),
5269 &args,
5270 THREAD);
5271 }
5272 if (HAS_PENDING_EXCEPTION) {
5273 CLEAR_PENDING_EXCEPTION;
5274 return NULL;
5275 }
5276 if(result.get_jboolean()) {
5277 continue;
5278 }
5279 }
5280 return (not_first_ch) ? old_p : NULL;
5281 }
5282 return (not_first_ch) ? p : NULL;
5283 }
5284
5285 // Take pointer to a UTF8 byte string (not NUL-terminated).
5286 // Skip over the longest part of the string that could
5287 // be taken as a field signature. Allow "void" if void_ok.
5288 // Return a pointer to just past the signature.
5289 // Return NULL if no legal signature is found.
5290 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5291 bool void_ok,
5292 unsigned int length,
5293 TRAPS) const {
5294 unsigned int array_dim = 0;
5295 while (length > 0) {
5296 switch (signature[0]) {
5297 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5298 case JVM_SIGNATURE_BOOLEAN:
5299 case JVM_SIGNATURE_BYTE:
5300 case JVM_SIGNATURE_CHAR:
5301 case JVM_SIGNATURE_SHORT:
5302 case JVM_SIGNATURE_INT:
5303 case JVM_SIGNATURE_FLOAT:
5304 case JVM_SIGNATURE_LONG:
5305 case JVM_SIGNATURE_DOUBLE:
5306 return signature + 1;
5307 case JVM_SIGNATURE_CLASS: {
5308 if (_major_version < JAVA_1_5_VERSION) {
5309 // Skip over the class name if one is there
5310 const char* const p = skip_over_field_name(signature + 1, true, --length);
5311
5312 // The next character better be a semicolon
5313 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
5314 return p + 1;
5315 }
5316 }
5317 else {
5318 // Skip leading 'L' and ignore first appearance of ';'
5319 signature++;
5320 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
5321 // Format check signature
5322 if (c != NULL) {
5323 int newlen = c - (char*) signature;
5324 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5325 if (!legal) {
5326 classfile_parse_error("Class name is empty or contains illegal character "
5327 "in descriptor in class file %s",
5328 CHECK_0);
5329 return NULL;
5330 }
5331 return signature + newlen + 1;
5332 }
5333 }
5334 return NULL;
5335 }
5336 case JVM_SIGNATURE_ARRAY:
5337 array_dim++;
5338 if (array_dim > 255) {
5339 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5340 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5341 }
5342 // The rest of what's there better be a legal signature
5343 signature++;
5344 length--;
5345 void_ok = false;
5346 break;
5347 default:
5348 return NULL;
5349 }
5350 }
5351 return NULL;
5352 }
5353
5354 // Checks if name is a legal class name.
5355 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5356 if (!_need_verify || _relax_verify) { return; }
5357
5358 assert(name->refcount() > 0, "symbol must be kept alive");
5359 char* bytes = (char*)name->bytes();
5360 unsigned int length = name->utf8_length();
5361 bool legal = false;
5362
5363 if (length > 0) {
5364 const char* p;
5365 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5366 p = skip_over_field_signature(bytes, false, length, CHECK);
5367 legal = (p != NULL) && ((p - bytes) == (int)length);
5368 } else if (_major_version < JAVA_1_5_VERSION) {
5369 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5370 p = skip_over_field_name(bytes, true, length);
5371 legal = (p != NULL) && ((p - bytes) == (int)length);
5372 }
5373 } else {
5374 // 4900761: relax the constraints based on JSR202 spec
5375 // Class names may be drawn from the entire Unicode character set.
5376 // Identifiers between '/' must be unqualified names.
5377 // The utf8 string has been verified when parsing cpool entries.
5378 legal = verify_unqualified_name(bytes, length, LegalClass);
5379 }
5380 }
5381 if (!legal) {
5382 ResourceMark rm(THREAD);
5383 assert(_class_name != NULL, "invariant");
5384 Exceptions::fthrow(
5385 THREAD_AND_LOCATION,
5386 vmSymbols::java_lang_ClassFormatError(),
5387 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5388 _class_name->as_C_string()
5389 );
5390 return;
5391 }
5392 }
5393
5394 // Checks if name is a legal field name.
5395 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5396 if (!_need_verify || _relax_verify) { return; }
5397
5398 char* bytes = (char*)name->bytes();
5399 unsigned int length = name->utf8_length();
5400 bool legal = false;
5401
5402 if (length > 0) {
5403 if (_major_version < JAVA_1_5_VERSION) {
5404 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5405 const char* p = skip_over_field_name(bytes, false, length);
5406 legal = (p != NULL) && ((p - bytes) == (int)length);
5407 }
5408 } else {
5409 // 4881221: relax the constraints based on JSR202 spec
5410 legal = verify_unqualified_name(bytes, length, LegalField);
5411 }
5412 }
5413
5414 if (!legal) {
5415 ResourceMark rm(THREAD);
5416 assert(_class_name != NULL, "invariant");
5417 Exceptions::fthrow(
5418 THREAD_AND_LOCATION,
5419 vmSymbols::java_lang_ClassFormatError(),
5420 "Illegal field name \"%.*s\" in class %s", length, bytes,
5421 _class_name->as_C_string()
5422 );
5423 return;
5424 }
5425 }
5426
5427 // Checks if name is a legal method name.
5428 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5429 if (!_need_verify || _relax_verify) { return; }
5430
5431 assert(name != NULL, "method name is null");
5432 char* bytes = (char*)name->bytes();
5433 unsigned int length = name->utf8_length();
5434 bool legal = false;
5435
5436 if (length > 0) {
5437 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5438 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5439 legal = true;
5440 }
5441 } else if (_major_version < JAVA_1_5_VERSION) {
5442 const char* p;
5443 p = skip_over_field_name(bytes, false, length);
5444 legal = (p != NULL) && ((p - bytes) == (int)length);
5445 } else {
5446 // 4881221: relax the constraints based on JSR202 spec
5447 legal = verify_unqualified_name(bytes, length, LegalMethod);
5448 }
5449 }
5450
5451 if (!legal) {
5452 ResourceMark rm(THREAD);
5453 assert(_class_name != NULL, "invariant");
5454 Exceptions::fthrow(
5455 THREAD_AND_LOCATION,
5456 vmSymbols::java_lang_ClassFormatError(),
5457 "Illegal method name \"%.*s\" in class %s", length, bytes,
5458 _class_name->as_C_string()
5459 );
5460 return;
5461 }
5462 }
5463
5464
5465 // Checks if signature is a legal field signature.
5466 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5467 const Symbol* signature,
5468 TRAPS) const {
5469 if (!_need_verify) { return; }
5470
5471 const char* const bytes = (const char* const)signature->bytes();
5472 const unsigned int length = signature->utf8_length();
5473 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5474
5475 if (p == NULL || (p - bytes) != (int)length) {
5476 throwIllegalSignature("Field", name, signature, CHECK);
5477 }
5478 }
5479
5480 // Checks if signature is a legal method signature.
5481 // Returns number of parameters
5482 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5483 const Symbol* signature,
5484 TRAPS) const {
5485 if (!_need_verify) {
5486 // make sure caller's args_size will be less than 0 even for non-static
5487 // method so it will be recomputed in compute_size_of_parameters().
5488 return -2;
5489 }
5490
5491 // Class initializers cannot have args for class format version >= 51.
5492 if (name == vmSymbols::class_initializer_name() &&
5493 signature != vmSymbols::void_method_signature() &&
5494 _major_version >= JAVA_7_VERSION) {
5495 throwIllegalSignature("Method", name, signature, CHECK_0);
5496 return 0;
5497 }
5498
5499 unsigned int args_size = 0;
5500 const char* p = (const char*)signature->bytes();
5501 unsigned int length = signature->utf8_length();
5502 const char* nextp;
5503
5504 // The first character must be a '('
5505 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5506 length--;
5507 // Skip over legal field signatures
5508 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5509 while ((length > 0) && (nextp != NULL)) {
5510 args_size++;
5511 if (p[0] == 'J' || p[0] == 'D') {
5512 args_size++;
5513 }
5514 length -= nextp - p;
5515 p = nextp;
5516 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5517 }
5518 // The first non-signature thing better be a ')'
5519 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5520 length--;
5521 if (name->utf8_length() > 0 && name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
5522 // All internal methods must return void
5523 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5524 return args_size;
5525 }
5526 } else {
5527 // Now we better just have a return value
5528 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5529 if (nextp && ((int)length == (nextp - p))) {
5530 return args_size;
5531 }
5532 }
5533 }
5534 }
5535 // Report error
5536 throwIllegalSignature("Method", name, signature, CHECK_0);
5537 return 0;
5538 }
5539
5540 int ClassFileParser::static_field_size() const {
5541 assert(_field_info != NULL, "invariant");
5542 return _field_info->static_field_size;
5543 }
5544
5545 int ClassFileParser::total_oop_map_count() const {
5546 assert(_field_info != NULL, "invariant");
5547 return _field_info->total_oop_map_count;
5548 }
5549
5550 jint ClassFileParser::layout_size() const {
5551 assert(_field_info != NULL, "invariant");
5552 return _field_info->instance_size;
5553 }
5554
5555 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5556 const Array<Method*>* methods) {
5557 assert(ik != NULL, "invariant");
5558 assert(methods != NULL, "invariant");
5559
5560 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5561 // (We used to do this lazily, but now we query it in Rewriter,
5562 // which is eagerly done for every method, so we might as well do it now,
5563 // when everything is fresh in memory.)
5564 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5565
5566 if (klass_id != vmSymbols::NO_SID) {
5567 for (int j = 0; j < methods->length(); ++j) {
5568 Method* method = methods->at(j);
5569 method->init_intrinsic_id();
5570
5571 if (CheckIntrinsics) {
5572 // Check if an intrinsic is defined for method 'method',
5573 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5574 if (method->intrinsic_id() != vmIntrinsics::_none &&
5575 !method->intrinsic_candidate()) {
5576 tty->print("Compiler intrinsic is defined for method [%s], "
5577 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5578 method->name_and_sig_as_C_string(),
5579 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5580 );
5581 tty->cr();
5582 DEBUG_ONLY(vm_exit(1));
5583 }
5584 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5585 // but there is no intrinsic available for it.
5586 if (method->intrinsic_candidate() &&
5587 method->intrinsic_id() == vmIntrinsics::_none) {
5588 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5589 "but no compiler intrinsic is defined for the method.%s",
5590 method->name_and_sig_as_C_string(),
5591 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5592 );
5593 tty->cr();
5594 DEBUG_ONLY(vm_exit(1));
5595 }
5596 }
5597 } // end for
5598
5599 #ifdef ASSERT
5600 if (CheckIntrinsics) {
5601 // Check for orphan methods in the current class. A method m
5602 // of a class C is orphan if an intrinsic is defined for method m,
5603 // but class C does not declare m.
5604 // The check is potentially expensive, therefore it is available
5605 // only in debug builds.
5606
5607 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5608 if (vmIntrinsics::_compiledLambdaForm == id) {
5609 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5610 // generated for the JVM from a LambdaForm and therefore no method
5611 // is defined for it.
5612 continue;
5613 }
5614
5615 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5616 // Check if the current class contains a method with the same
5617 // name, flags, signature.
5618 bool match = false;
5619 for (int j = 0; j < methods->length(); ++j) {
5620 const Method* method = methods->at(j);
5621 if (method->intrinsic_id() == id) {
5622 match = true;
5623 break;
5624 }
5625 }
5626
5627 if (!match) {
5628 char buf[1000];
5629 tty->print("Compiler intrinsic is defined for method [%s], "
5630 "but the method is not available in class [%s].%s",
5631 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5632 buf, sizeof(buf)),
5633 ik->name()->as_C_string(),
5634 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5635 );
5636 tty->cr();
5637 DEBUG_ONLY(vm_exit(1));
5638 }
5639 }
5640 } // end for
5641 } // CheckIntrinsics
5642 #endif // ASSERT
5643 }
5644 }
5645
5646 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5647 if (_klass != NULL) {
5648 return _klass;
5649 }
5650
5651 InstanceKlass* const ik =
5652 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5653
5654 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5655
5656 assert(_klass == ik, "invariant");
5657
5658
5659 if (ik->should_store_fingerprint()) {
5660 ik->store_fingerprint(_stream->compute_fingerprint());
5661 }
5662
5663 ik->set_has_passed_fingerprint_check(false);
5664 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5665 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5666 uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint();
5667 if (aot_fp != 0 && aot_fp == fp) {
5668 // This class matches with a class saved in an AOT library
5669 ik->set_has_passed_fingerprint_check(true);
5670 } else {
5671 ResourceMark rm;
5672 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5673 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5674 }
5675 }
5676
5677 return ik;
5678 }
5679
5680 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5681 assert(ik != NULL, "invariant");
5682
5683 // Set name and CLD before adding to CLD
5684 ik->set_class_loader_data(_loader_data);
5685 ik->set_name(_class_name);
5686
5687 // Add all classes to our internal class loader list here,
5688 // including classes in the bootstrap (NULL) class loader.
5689 const bool publicize = !is_internal();
5690
5691 _loader_data->add_class(ik, publicize);
5692
5693 set_klass_to_deallocate(ik);
5694
5695 assert(_field_info != NULL, "invariant");
5696 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5697 assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count,
5698 "sanity");
5699
5700 assert(ik->is_instance_klass(), "sanity");
5701 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5702
5703 // Fill in information already parsed
5704 ik->set_should_verify_class(_need_verify);
5705
5706 // Not yet: supers are done below to support the new subtype-checking fields
5707 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5708 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5709 assert(_fac != NULL, "invariant");
5710 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5711
5712 // this transfers ownership of a lot of arrays from
5713 // the parser onto the InstanceKlass*
5714 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5715
5716 // note that is not safe to use the fields in the parser from this point on
5717 assert(NULL == _cp, "invariant");
5718 assert(NULL == _fields, "invariant");
5719 assert(NULL == _methods, "invariant");
5720 assert(NULL == _inner_classes, "invariant");
5721 assert(NULL == _nest_members, "invariant");
5722 assert(NULL == _local_interfaces, "invariant");
5723 assert(NULL == _combined_annotations, "invariant");
5724 assert(NULL == _record_components, "invariant");
5725
5726 if (_has_final_method) {
5727 ik->set_has_final_method();
5728 }
5729
5730 ik->copy_method_ordering(_method_ordering, CHECK);
5731 // The InstanceKlass::_methods_jmethod_ids cache
5732 // is managed on the assumption that the initial cache
5733 // size is equal to the number of methods in the class. If
5734 // that changes, then InstanceKlass::idnum_can_increment()
5735 // has to be changed accordingly.
5736 ik->set_initial_method_idnum(ik->methods()->length());
5737
5738 ik->set_this_class_index(_this_class_index);
5739
5740 if (is_unsafe_anonymous()) {
5741 // _this_class_index is a CONSTANT_Class entry that refers to this
5742 // anonymous class itself. If this class needs to refer to its own methods or
5743 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5744 // _this_class_index. However, because this class is anonymous (it's
5745 // not stored in SystemDictionary), _this_class_index cannot be resolved
5746 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5747 // Therefore, we must eagerly resolve _this_class_index now.
5748 ik->constants()->klass_at_put(_this_class_index, ik);
5749 }
5750
5751 ik->set_minor_version(_minor_version);
5752 ik->set_major_version(_major_version);
5753 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5754 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5755
5756 if (_unsafe_anonymous_host != NULL) {
5757 assert (ik->is_unsafe_anonymous(), "should be the same");
5758 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host);
5759 }
5760
5761 // Set PackageEntry for this_klass
5762 oop cl = ik->class_loader();
5763 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5764 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5765 ik->set_package(cld, CHECK);
5766
5767 const Array<Method*>* const methods = ik->methods();
5768 assert(methods != NULL, "invariant");
5769 const int methods_len = methods->length();
5770
5771 check_methods_for_intrinsics(ik, methods);
5772
5773 // Fill in field values obtained by parse_classfile_attributes
5774 if (_parsed_annotations->has_any_annotations()) {
5775 _parsed_annotations->apply_to(ik);
5776 }
5777
5778 apply_parsed_class_attributes(ik);
5779
5780 // Miranda methods
5781 if ((_num_miranda_methods > 0) ||
5782 // if this class introduced new miranda methods or
5783 (_super_klass != NULL && _super_klass->has_miranda_methods())
5784 // super class exists and this class inherited miranda methods
5785 ) {
5786 ik->set_has_miranda_methods(); // then set a flag
5787 }
5788
5789 // Fill in information needed to compute superclasses.
5790 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5791 ik->set_transitive_interfaces(_transitive_interfaces);
5792 _transitive_interfaces = NULL;
5793
5794 // Initialize itable offset tables
5795 klassItable::setup_itable_offset_table(ik);
5796
5797 // Compute transitive closure of interfaces this class implements
5798 // Do final class setup
5799 fill_oop_maps(ik,
5800 _field_info->nonstatic_oop_map_count,
5801 _field_info->nonstatic_oop_offsets,
5802 _field_info->nonstatic_oop_counts);
5803
5804 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5805 set_precomputed_flags(ik);
5806
5807 // check if this class can access its super class
5808 check_super_class_access(ik, CHECK);
5809
5810 // check if this class can access its superinterfaces
5811 check_super_interface_access(ik, CHECK);
5812
5813 // check if this class overrides any final method
5814 check_final_method_override(ik, CHECK);
5815
5816 // reject static interface methods prior to Java 8
5817 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5818 check_illegal_static_method(ik, CHECK);
5819 }
5820
5821 // Obtain this_klass' module entry
5822 ModuleEntry* module_entry = ik->module();
5823 assert(module_entry != NULL, "module_entry should always be set");
5824
5825 // Obtain java.lang.Module
5826 Handle module_handle(THREAD, module_entry->module());
5827
5828 // Allocate mirror and initialize static fields
5829 // The create_mirror() call will also call compute_modifiers()
5830 java_lang_Class::create_mirror(ik,
5831 Handle(THREAD, _loader_data->class_loader()),
5832 module_handle,
5833 _protection_domain,
5834 CHECK);
5835
5836 assert(_all_mirandas != NULL, "invariant");
5837
5838 // Generate any default methods - default methods are public interface methods
5839 // that have a default implementation. This is new with Java 8.
5840 if (_has_nonstatic_concrete_methods) {
5841 DefaultMethods::generate_default_methods(ik,
5842 _all_mirandas,
5843 CHECK);
5844 }
5845
5846 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5847 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5848 !module_entry->has_default_read_edges()) {
5849 if (!module_entry->set_has_default_read_edges()) {
5850 // We won a potential race
5851 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5852 }
5853 }
5854
5855 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5856
5857 if (!is_internal()) {
5858 if (log_is_enabled(Info, class, load)) {
5859 ResourceMark rm;
5860 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5861 ik->print_class_load_logging(_loader_data, module_name, _stream);
5862 }
5863
5864 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5865 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5866 log_is_enabled(Info, class, preview)) {
5867 ResourceMark rm;
5868 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5869 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5870 }
5871
5872 if (log_is_enabled(Debug, class, resolve)) {
5873 ResourceMark rm;
5874 // print out the superclass.
5875 const char * from = ik->external_name();
5876 if (ik->java_super() != NULL) {
5877 log_debug(class, resolve)("%s %s (super)",
5878 from,
5879 ik->java_super()->external_name());
5880 }
5881 // print out each of the interface classes referred to by this class.
5882 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5883 if (local_interfaces != NULL) {
5884 const int length = local_interfaces->length();
5885 for (int i = 0; i < length; i++) {
5886 const InstanceKlass* const k = local_interfaces->at(i);
5887 const char * to = k->external_name();
5888 log_debug(class, resolve)("%s %s (interface)", from, to);
5889 }
5890 }
5891 }
5892 }
5893
5894 JFR_ONLY(INIT_ID(ik);)
5895
5896 // If we reach here, all is well.
5897 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5898 // in order for it to not be destroyed in the ClassFileParser destructor.
5899 set_klass_to_deallocate(NULL);
5900
5901 // it's official
5902 set_klass(ik);
5903
5904 debug_only(ik->verify();)
5905 }
5906
5907 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5908 // Decrement the refcount in the old name, since we're clobbering it.
5909 _class_name->decrement_refcount();
5910
5911 _class_name = new_class_name;
5912 // Increment the refcount of the new name.
5913 // Now the ClassFileParser owns this name and will decrement in
5914 // the destructor.
5915 _class_name->increment_refcount();
5916 }
5917
5918
5919 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's
5920 // package by prepending its host class's package name to its class name and setting
5921 // its _class_name field.
5922 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) {
5923 ResourceMark rm(THREAD);
5924 assert(strrchr(_class_name->as_C_string(), JVM_SIGNATURE_SLASH) == NULL,
5925 "Unsafe anonymous class should not be in a package");
5926 const char* host_pkg_name =
5927 ClassLoader::package_from_name(unsafe_anonymous_host->name()->as_C_string(), NULL);
5928
5929 if (host_pkg_name != NULL) {
5930 int host_pkg_len = (int)strlen(host_pkg_name);
5931 int class_name_len = _class_name->utf8_length();
5932 int symbol_len = host_pkg_len + 1 + class_name_len;
5933 char* new_anon_name = NEW_RESOURCE_ARRAY(char, symbol_len + 1);
5934 int n = os::snprintf(new_anon_name, symbol_len + 1, "%s/%.*s",
5935 host_pkg_name, class_name_len, _class_name->base());
5936 assert(n == symbol_len, "Unexpected number of characters in string");
5937
5938 // Decrement old _class_name to avoid leaking.
5939 _class_name->decrement_refcount();
5940
5941 // Create a symbol and update the anonymous class name.
5942 // The new class name is created with a refcount of one. When installed into the InstanceKlass,
5943 // it'll be two and when the ClassFileParser destructor runs, it'll go back to one and get deleted
5944 // when the class is unloaded.
5945 _class_name = SymbolTable::new_symbol(new_anon_name, symbol_len);
5946 }
5947 }
5948
5949 // If the host class and the anonymous class are in the same package then do
5950 // nothing. If the anonymous class is in the unnamed package then move it to its
5951 // host's package. If the classes are in different packages then throw an IAE
5952 // exception.
5953 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) {
5954 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class");
5955
5956 const jbyte* anon_last_slash = UTF8::strrchr((const jbyte*)_class_name->base(),
5957 _class_name->utf8_length(), JVM_SIGNATURE_SLASH);
5958 if (anon_last_slash == NULL) { // Unnamed package
5959 prepend_host_package_name(_unsafe_anonymous_host, CHECK);
5960 } else {
5961 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) {
5962 ResourceMark rm(THREAD);
5963 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
5964 err_msg("Host class %s and anonymous class %s are in different packages",
5965 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string()));
5966 }
5967 }
5968 }
5969
5970 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5971 bool trusted = (loader_data->is_the_null_class_loader_data() ||
5972 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
5973 bool need_verify =
5974 // verifyAll
5975 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5976 // verifyRemote
5977 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5978 return !need_verify;
5979 }
5980
5981 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5982 Symbol* name,
5983 ClassLoaderData* loader_data,
5984 Handle protection_domain,
5985 const InstanceKlass* unsafe_anonymous_host,
5986 GrowableArray<Handle>* cp_patches,
5987 Publicity pub_level,
5988 TRAPS) :
5989 _stream(stream),
5990 _requested_name(name),
5991 _class_name(NULL),
5992 _loader_data(loader_data),
5993 _unsafe_anonymous_host(unsafe_anonymous_host),
5994 _cp_patches(cp_patches),
5995 _num_patched_klasses(0),
5996 _max_num_patched_klasses(0),
5997 _orig_cp_size(0),
5998 _first_patched_klass_resolved_index(0),
5999 _super_klass(),
6000 _cp(NULL),
6001 _fields(NULL),
6002 _methods(NULL),
6003 _inner_classes(NULL),
6004 _nest_members(NULL),
6005 _nest_host(0),
6006 _record_components(NULL),
6007 _local_interfaces(NULL),
6008 _transitive_interfaces(NULL),
6009 _combined_annotations(NULL),
6010 _class_annotations(NULL),
6011 _class_type_annotations(NULL),
6012 _fields_annotations(NULL),
6013 _fields_type_annotations(NULL),
6014 _klass(NULL),
6015 _klass_to_deallocate(NULL),
6016 _parsed_annotations(NULL),
6017 _fac(NULL),
6018 _field_info(NULL),
6019 _method_ordering(NULL),
6020 _all_mirandas(NULL),
6021 _vtable_size(0),
6022 _itable_size(0),
6023 _num_miranda_methods(0),
6024 _rt(REF_NONE),
6025 _protection_domain(protection_domain),
6026 _access_flags(),
6027 _pub_level(pub_level),
6028 _bad_constant_seen(0),
6029 _synthetic_flag(false),
6030 _sde_length(false),
6031 _sde_buffer(NULL),
6032 _sourcefile_index(0),
6033 _generic_signature_index(0),
6034 _major_version(0),
6035 _minor_version(0),
6036 _this_class_index(0),
6037 _super_class_index(0),
6038 _itfs_len(0),
6039 _java_fields_count(0),
6040 _need_verify(false),
6041 _relax_verify(false),
6042 _has_nonstatic_concrete_methods(false),
6043 _declares_nonstatic_concrete_methods(false),
6044 _has_final_method(false),
6045 _has_finalizer(false),
6046 _has_empty_finalizer(false),
6047 _has_vanilla_constructor(false),
6048 _max_bootstrap_specifier_index(-1) {
6049
6050 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6051 _class_name->increment_refcount();
6052
6053 assert(THREAD->is_Java_thread(), "invariant");
6054 assert(_loader_data != NULL, "invariant");
6055 assert(stream != NULL, "invariant");
6056 assert(_stream != NULL, "invariant");
6057 assert(_stream->buffer() == _stream->current(), "invariant");
6058 assert(_class_name != NULL, "invariant");
6059 assert(0 == _access_flags.as_int(), "invariant");
6060
6061 // Figure out whether we can skip format checking (matching classic VM behavior)
6062 if (DumpSharedSpaces) {
6063 // verify == true means it's a 'remote' class (i.e., non-boot class)
6064 // Verification decision is based on BytecodeVerificationRemote flag
6065 // for those classes.
6066 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
6067 BytecodeVerificationLocal;
6068 }
6069 else {
6070 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
6071 stream->need_verify());
6072 }
6073 if (_cp_patches != NULL) {
6074 int len = _cp_patches->length();
6075 for (int i=0; i<len; i++) {
6076 if (has_cp_patch_at(i)) {
6077 Handle patch = cp_patch_at(i);
6078 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
6079 // We need to append the names of the patched classes to the end of the constant pool,
6080 // because a patched class may have a Utf8 name that's not already included in the
6081 // original constant pool. These class names are used when patch_constant_pool()
6082 // calls patch_class().
6083 //
6084 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
6085 // At this point, we don't know the tag for index i yet, because we haven't parsed the
6086 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
6087 _max_num_patched_klasses++;
6088 }
6089 }
6090 }
6091 }
6092
6093 // synch back verification state to stream
6094 stream->set_verify(_need_verify);
6095
6096 // Check if verification needs to be relaxed for this class file
6097 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
6098 _relax_verify = relax_format_check_for(_loader_data);
6099
6100 parse_stream(stream, CHECK);
6101
6102 post_process_parsed_stream(stream, _cp, CHECK);
6103 }
6104
6105 void ClassFileParser::clear_class_metadata() {
6106 // metadata created before the instance klass is created. Must be
6107 // deallocated if classfile parsing returns an error.
6108 _cp = NULL;
6109 _fields = NULL;
6110 _methods = NULL;
6111 _inner_classes = NULL;
6112 _nest_members = NULL;
6113 _local_interfaces = NULL;
6114 _combined_annotations = NULL;
6115 _class_annotations = _class_type_annotations = NULL;
6116 _fields_annotations = _fields_type_annotations = NULL;
6117 _record_components = NULL;
6118 }
6119
6120 // Destructor to clean up
6121 ClassFileParser::~ClassFileParser() {
6122 _class_name->decrement_refcount();
6123
6124 if (_cp != NULL) {
6125 MetadataFactory::free_metadata(_loader_data, _cp);
6126 }
6127 if (_fields != NULL) {
6128 MetadataFactory::free_array<u2>(_loader_data, _fields);
6129 }
6130
6131 if (_methods != NULL) {
6132 // Free methods
6133 InstanceKlass::deallocate_methods(_loader_data, _methods);
6134 }
6135
6136 // beware of the Universe::empty_blah_array!!
6137 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6138 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6139 }
6140
6141 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
6142 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6143 }
6144
6145 if (_record_components != NULL) {
6146 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
6147 }
6148
6149 // Free interfaces
6150 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6151 _local_interfaces, _transitive_interfaces);
6152
6153 if (_combined_annotations != NULL) {
6154 // After all annotations arrays have been created, they are installed into the
6155 // Annotations object that will be assigned to the InstanceKlass being created.
6156
6157 // Deallocate the Annotations object and the installed annotations arrays.
6158 _combined_annotations->deallocate_contents(_loader_data);
6159
6160 // If the _combined_annotations pointer is non-NULL,
6161 // then the other annotations fields should have been cleared.
6162 assert(_class_annotations == NULL, "Should have been cleared");
6163 assert(_class_type_annotations == NULL, "Should have been cleared");
6164 assert(_fields_annotations == NULL, "Should have been cleared");
6165 assert(_fields_type_annotations == NULL, "Should have been cleared");
6166 } else {
6167 // If the annotations arrays were not installed into the Annotations object,
6168 // then they have to be deallocated explicitly.
6169 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
6170 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
6171 Annotations::free_contents(_loader_data, _fields_annotations);
6172 Annotations::free_contents(_loader_data, _fields_type_annotations);
6173 }
6174
6175 clear_class_metadata();
6176 _transitive_interfaces = NULL;
6177
6178 // deallocate the klass if already created. Don't directly deallocate, but add
6179 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6180 // at a safepoint.
6181 if (_klass_to_deallocate != NULL) {
6182 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6183 }
6184 }
6185
6186 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6187 TRAPS) {
6188
6189 assert(stream != NULL, "invariant");
6190 assert(_class_name != NULL, "invariant");
6191
6192 // BEGIN STREAM PARSING
6193 stream->guarantee_more(8, CHECK); // magic, major, minor
6194 // Magic value
6195 const u4 magic = stream->get_u4_fast();
6196 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6197 "Incompatible magic value %u in class file %s",
6198 magic, CHECK);
6199
6200 // Version numbers
6201 _minor_version = stream->get_u2_fast();
6202 _major_version = stream->get_u2_fast();
6203
6204 if (DumpSharedSpaces && _major_version < JAVA_6_VERSION) {
6205 ResourceMark rm;
6206 warning("Pre JDK 6 class not supported by CDS: %u.%u %s",
6207 _major_version, _minor_version, _class_name->as_C_string());
6208 Exceptions::fthrow(
6209 THREAD_AND_LOCATION,
6210 vmSymbols::java_lang_UnsupportedClassVersionError(),
6211 "Unsupported major.minor version for dump time %u.%u",
6212 _major_version,
6213 _minor_version);
6214 }
6215
6216 // Check version numbers - we check this even with verifier off
6217 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6218
6219 stream->guarantee_more(3, CHECK); // length, first cp tag
6220 u2 cp_size = stream->get_u2_fast();
6221
6222 guarantee_property(
6223 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6224 cp_size, CHECK);
6225
6226 _orig_cp_size = cp_size;
6227 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6228 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6229 }
6230 cp_size += _max_num_patched_klasses;
6231
6232 _cp = ConstantPool::allocate(_loader_data,
6233 cp_size,
6234 CHECK);
6235
6236 ConstantPool* const cp = _cp;
6237
6238 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6239
6240 assert(cp_size == (const u2)cp->length(), "invariant");
6241
6242 // ACCESS FLAGS
6243 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6244
6245 // Access flags
6246 jint flags;
6247 // JVM_ACC_MODULE is defined in JDK-9 and later.
6248 if (_major_version >= JAVA_9_VERSION) {
6249 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
6250 } else {
6251 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
6252 }
6253
6254 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6255 // Set abstract bit for old class files for backward compatibility
6256 flags |= JVM_ACC_ABSTRACT;
6257 }
6258
6259 verify_legal_class_modifiers(flags, CHECK);
6260
6261 short bad_constant = class_bad_constant_seen();
6262 if (bad_constant != 0) {
6263 // Do not throw CFE until after the access_flags are checked because if
6264 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6265 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6266 }
6267
6268 _access_flags.set_flags(flags);
6269
6270 // This class and superclass
6271 _this_class_index = stream->get_u2_fast();
6272 check_property(
6273 valid_cp_range(_this_class_index, cp_size) &&
6274 cp->tag_at(_this_class_index).is_unresolved_klass(),
6275 "Invalid this class index %u in constant pool in class file %s",
6276 _this_class_index, CHECK);
6277
6278 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6279 assert(class_name_in_cp != NULL, "class_name can't be null");
6280
6281 // Update _class_name to reflect the name in the constant pool
6282 update_class_name(class_name_in_cp);
6283
6284 // Don't need to check whether this class name is legal or not.
6285 // It has been checked when constant pool is parsed.
6286 // However, make sure it is not an array type.
6287 if (_need_verify) {
6288 guarantee_property(_class_name->char_at(0) != JVM_SIGNATURE_ARRAY,
6289 "Bad class name in class file %s",
6290 CHECK);
6291 }
6292
6293 // Checks if name in class file matches requested name
6294 if (_requested_name != NULL && _requested_name != _class_name) {
6295 ResourceMark rm(THREAD);
6296 Exceptions::fthrow(
6297 THREAD_AND_LOCATION,
6298 vmSymbols::java_lang_NoClassDefFoundError(),
6299 "%s (wrong name: %s)",
6300 _class_name->as_C_string(),
6301 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6302 );
6303 return;
6304 }
6305
6306 // if this is an anonymous class fix up its name if it's in the unnamed
6307 // package. Otherwise, throw IAE if it is in a different package than
6308 // its host class.
6309 if (_unsafe_anonymous_host != NULL) {
6310 fix_unsafe_anonymous_class_name(CHECK);
6311 }
6312
6313 // Verification prevents us from creating names with dots in them, this
6314 // asserts that that's the case.
6315 assert(is_internal_format(_class_name), "external class name format used internally");
6316
6317 if (!is_internal()) {
6318 LogTarget(Debug, class, preorder) lt;
6319 if (lt.is_enabled()){
6320 ResourceMark rm(THREAD);
6321 LogStream ls(lt);
6322 ls.print("%s", _class_name->as_klass_external_name());
6323 if (stream->source() != NULL) {
6324 ls.print(" source: %s", stream->source());
6325 }
6326 ls.cr();
6327 }
6328
6329 #if INCLUDE_CDS
6330 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6331 if (!ClassLoader::has_jrt_entry()) {
6332 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6333 DumpLoadedClassList = NULL;
6334 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6335 _unsafe_anonymous_host == NULL) {
6336 // Only dump the classes that can be stored into CDS archive.
6337 // Unsafe anonymous classes such as generated LambdaForm classes are also not included.
6338 oop class_loader = _loader_data->class_loader();
6339 ResourceMark rm(THREAD);
6340 bool skip = false;
6341 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6342 // For the boot and platform class loaders, skip classes that are not found in the
6343 // java runtime image, such as those found in the --patch-module entries.
6344 // These classes can't be loaded from the archive during runtime.
6345 if (!stream->from_boot_loader_modules_image() && strncmp(stream->source(), "jrt:", 4) != 0) {
6346 skip = true;
6347 }
6348
6349 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6350 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6351 // as they can be loaded from the archive during runtime.
6352 skip = false;
6353 }
6354 }
6355 if (skip) {
6356 tty->print_cr("skip writing class %s from source %s to classlist file",
6357 _class_name->as_C_string(), stream->source());
6358 } else {
6359 classlist_file->print_cr("%s", _class_name->as_C_string());
6360 classlist_file->flush();
6361 }
6362 }
6363 }
6364 #endif
6365 }
6366
6367 // SUPERKLASS
6368 _super_class_index = stream->get_u2_fast();
6369 _super_klass = parse_super_class(cp,
6370 _super_class_index,
6371 _need_verify,
6372 CHECK);
6373
6374 // Interfaces
6375 _itfs_len = stream->get_u2_fast();
6376 parse_interfaces(stream,
6377 _itfs_len,
6378 cp,
6379 &_has_nonstatic_concrete_methods,
6380 CHECK);
6381
6382 assert(_local_interfaces != NULL, "invariant");
6383
6384 // Fields (offsets are filled in later)
6385 _fac = new FieldAllocationCount();
6386 parse_fields(stream,
6387 _access_flags.is_interface(),
6388 _fac,
6389 cp,
6390 cp_size,
6391 &_java_fields_count,
6392 CHECK);
6393
6394 assert(_fields != NULL, "invariant");
6395
6396 // Methods
6397 AccessFlags promoted_flags;
6398 parse_methods(stream,
6399 _access_flags.is_interface(),
6400 &promoted_flags,
6401 &_has_final_method,
6402 &_declares_nonstatic_concrete_methods,
6403 CHECK);
6404
6405 assert(_methods != NULL, "invariant");
6406
6407 // promote flags from parse_methods() to the klass' flags
6408 _access_flags.add_promoted_flags(promoted_flags.as_int());
6409
6410 if (_declares_nonstatic_concrete_methods) {
6411 _has_nonstatic_concrete_methods = true;
6412 }
6413
6414 // Additional attributes/annotations
6415 _parsed_annotations = new ClassAnnotationCollector();
6416 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6417
6418 assert(_inner_classes != NULL, "invariant");
6419
6420 // Finalize the Annotations metadata object,
6421 // now that all annotation arrays have been created.
6422 create_combined_annotations(CHECK);
6423
6424 // Make sure this is the end of class file stream
6425 guarantee_property(stream->at_eos(),
6426 "Extra bytes at the end of class file %s",
6427 CHECK);
6428
6429 // all bytes in stream read and parsed
6430 }
6431
6432 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6433 ConstantPool* cp,
6434 TRAPS) {
6435 assert(stream != NULL, "invariant");
6436 assert(stream->at_eos(), "invariant");
6437 assert(cp != NULL, "invariant");
6438 assert(_loader_data != NULL, "invariant");
6439
6440 if (_class_name == vmSymbols::java_lang_Object()) {
6441 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6442 "java.lang.Object cannot implement an interface in class file %s",
6443 CHECK);
6444 }
6445 // We check super class after class file is parsed and format is checked
6446 if (_super_class_index > 0 && NULL ==_super_klass) {
6447 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6448 if (_access_flags.is_interface()) {
6449 // Before attempting to resolve the superclass, check for class format
6450 // errors not checked yet.
6451 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6452 "Interfaces must have java.lang.Object as superclass in class file %s",
6453 CHECK);
6454 }
6455 Handle loader(THREAD, _loader_data->class_loader());
6456 _super_klass = (const InstanceKlass*)
6457 SystemDictionary::resolve_super_or_fail(_class_name,
6458 super_class_name,
6459 loader,
6460 _protection_domain,
6461 true,
6462 CHECK);
6463 }
6464
6465 if (_super_klass != NULL) {
6466 if (_super_klass->has_nonstatic_concrete_methods()) {
6467 _has_nonstatic_concrete_methods = true;
6468 }
6469
6470 if (_super_klass->is_interface()) {
6471 ResourceMark rm(THREAD);
6472 Exceptions::fthrow(
6473 THREAD_AND_LOCATION,
6474 vmSymbols::java_lang_IncompatibleClassChangeError(),
6475 "class %s has interface %s as super class",
6476 _class_name->as_klass_external_name(),
6477 _super_klass->external_name()
6478 );
6479 return;
6480 }
6481 // Make sure super class is not final
6482 if (_super_klass->is_final()) {
6483 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6484 }
6485 }
6486
6487 // Compute the transitive list of all unique interfaces implemented by this class
6488 _transitive_interfaces =
6489 compute_transitive_interfaces(_super_klass,
6490 _local_interfaces,
6491 _loader_data,
6492 CHECK);
6493
6494 assert(_transitive_interfaces != NULL, "invariant");
6495
6496 // sort methods
6497 _method_ordering = sort_methods(_methods);
6498
6499 _all_mirandas = new GrowableArray<Method*>(20);
6500
6501 Handle loader(THREAD, _loader_data->class_loader());
6502 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6503 &_num_miranda_methods,
6504 _all_mirandas,
6505 _super_klass,
6506 _methods,
6507 _access_flags,
6508 _major_version,
6509 loader,
6510 _class_name,
6511 _local_interfaces,
6512 CHECK);
6513
6514 // Size of Java itable (in words)
6515 _itable_size = _access_flags.is_interface() ? 0 :
6516 klassItable::compute_itable_size(_transitive_interfaces);
6517
6518 assert(_fac != NULL, "invariant");
6519 assert(_parsed_annotations != NULL, "invariant");
6520
6521 _field_info = new FieldLayoutInfo();
6522 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6523
6524 // Compute reference typ
6525 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6526
6527 }
6528
6529 void ClassFileParser::set_klass(InstanceKlass* klass) {
6530
6531 #ifdef ASSERT
6532 if (klass != NULL) {
6533 assert(NULL == _klass, "leaking?");
6534 }
6535 #endif
6536
6537 _klass = klass;
6538 }
6539
6540 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6541
6542 #ifdef ASSERT
6543 if (klass != NULL) {
6544 assert(NULL == _klass_to_deallocate, "leaking?");
6545 }
6546 #endif
6547
6548 _klass_to_deallocate = klass;
6549 }
6550
6551 // Caller responsible for ResourceMark
6552 // clone stream with rewound position
6553 const ClassFileStream* ClassFileParser::clone_stream() const {
6554 assert(_stream != NULL, "invariant");
6555
6556 return _stream->clone();
6557 }
6558 // ----------------------------------------------------------------------------
6559 // debugging
6560
6561 #ifdef ASSERT
6562
6563 // return true if class_name contains no '.' (internal format is '/')
6564 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6565 if (class_name != NULL) {
6566 ResourceMark rm;
6567 char* name = class_name->as_C_string();
6568 return strchr(name, JVM_SIGNATURE_DOT) == NULL;
6569 } else {
6570 return true;
6571 }
6572 }
6573
6574 #endif