1 /*
2 * Copyright (c) 1997, 2018, 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/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/verificationType.hpp"
38 #include "classfile/verifier.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "gc/shared/gcLocker.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.inline.hpp"
48 #include "oops/annotations.hpp"
49 #include "oops/constantPool.inline.hpp"
50 #include "oops/fieldStreams.hpp"
51 #include "oops/instanceKlass.hpp"
52 #include "oops/instanceMirrorKlass.hpp"
53 #include "oops/klass.inline.hpp"
54 #include "oops/klassVtable.hpp"
55 #include "oops/metadata.hpp"
56 #include "oops/method.hpp"
57 #include "oops/oop.inline.hpp"
58 #include "oops/symbol.hpp"
59 #include "prims/jvmtiExport.hpp"
60 #include "prims/jvmtiThreadState.hpp"
61 #include "runtime/javaCalls.hpp"
62 #include "runtime/perfData.hpp"
63 #include "runtime/reflection.hpp"
64 #include "runtime/signature.hpp"
65 #include "runtime/timer.hpp"
66 #include "services/classLoadingService.hpp"
67 #include "services/threadService.hpp"
68 #include "trace/traceMacros.hpp"
69 #include "utilities/align.hpp"
70 #include "utilities/bitMap.inline.hpp"
71 #include "utilities/exceptions.hpp"
72 #include "utilities/globalDefinitions.hpp"
73 #include "utilities/growableArray.hpp"
74 #include "utilities/macros.hpp"
75 #include "utilities/ostream.hpp"
76 #include "utilities/resourceHash.hpp"
77 #if INCLUDE_CDS
78 #include "classfile/systemDictionaryShared.hpp"
79 #endif
80
81 // We generally try to create the oops directly when parsing, rather than
82 // allocating temporary data structures and copying the bytes twice. A
83 // temporary area is only needed when parsing utf8 entries in the constant
84 // pool and when parsing line number tables.
85
86 // We add assert in debug mode when class format is not checked.
87
88 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
89 #define JAVA_MIN_SUPPORTED_VERSION 45
90
91 // Used for two backward compatibility reasons:
92 // - to check for new additions to the class file format in JDK1.5
93 // - to check for bug fixes in the format checker in JDK1.5
94 #define JAVA_1_5_VERSION 49
95
96 // Used for backward compatibility reasons:
97 // - to check for javac bug fixes that happened after 1.5
98 // - also used as the max version when running in jdk6
99 #define JAVA_6_VERSION 50
100
101 // Used for backward compatibility reasons:
102 // - to disallow argument and require ACC_STATIC for <clinit> methods
103 #define JAVA_7_VERSION 51
104
105 // Extension method support.
106 #define JAVA_8_VERSION 52
107
108 #define JAVA_9_VERSION 53
109
110 #define JAVA_10_VERSION 54
111
112 #define JAVA_11_VERSION 55
113
114 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
115 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION,
116 "Unexpected bad constant pool entry");
117 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
118 }
119
120 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
121 ConstantPool* cp,
122 const int length,
123 TRAPS) {
124 assert(stream != NULL, "invariant");
125 assert(cp != NULL, "invariant");
126
127 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
128 // this function (_current can be allocated in a register, with scalar
129 // replacement of aggregates). The _current pointer is copied back to
130 // stream() when this function returns. DON'T call another method within
131 // this method that uses stream().
132 const ClassFileStream cfs1 = *stream;
133 const ClassFileStream* const cfs = &cfs1;
134
135 assert(cfs->allocated_on_stack(), "should be local");
136 debug_only(const u1* const old_current = stream->current();)
137
138 // Used for batching symbol allocations.
139 const char* names[SymbolTable::symbol_alloc_batch_size];
140 int lengths[SymbolTable::symbol_alloc_batch_size];
141 int indices[SymbolTable::symbol_alloc_batch_size];
142 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
143 int names_count = 0;
144
145 // parsing Index 0 is unused
146 for (int index = 1; index < length; index++) {
147 // Each of the following case guarantees one more byte in the stream
148 // for the following tag or the access_flags following constant pool,
149 // so we don't need bounds-check for reading tag.
150 const u1 tag = cfs->get_u1_fast();
151 switch (tag) {
152 case JVM_CONSTANT_Class : {
153 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
154 const u2 name_index = cfs->get_u2_fast();
155 cp->klass_index_at_put(index, name_index);
156 break;
157 }
158 case JVM_CONSTANT_Fieldref: {
159 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
160 const u2 class_index = cfs->get_u2_fast();
161 const u2 name_and_type_index = cfs->get_u2_fast();
162 cp->field_at_put(index, class_index, name_and_type_index);
163 break;
164 }
165 case JVM_CONSTANT_Methodref: {
166 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
167 const u2 class_index = cfs->get_u2_fast();
168 const u2 name_and_type_index = cfs->get_u2_fast();
169 cp->method_at_put(index, class_index, name_and_type_index);
170 break;
171 }
172 case JVM_CONSTANT_InterfaceMethodref: {
173 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
174 const u2 class_index = cfs->get_u2_fast();
175 const u2 name_and_type_index = cfs->get_u2_fast();
176 cp->interface_method_at_put(index, class_index, name_and_type_index);
177 break;
178 }
179 case JVM_CONSTANT_String : {
180 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
181 const u2 string_index = cfs->get_u2_fast();
182 cp->string_index_at_put(index, string_index);
183 break;
184 }
185 case JVM_CONSTANT_MethodHandle :
186 case JVM_CONSTANT_MethodType: {
187 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
188 classfile_parse_error(
189 "Class file version does not support constant tag %u in class file %s",
190 tag, CHECK);
191 }
192 if (tag == JVM_CONSTANT_MethodHandle) {
193 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
194 const u1 ref_kind = cfs->get_u1_fast();
195 const u2 method_index = cfs->get_u2_fast();
196 cp->method_handle_index_at_put(index, ref_kind, method_index);
197 }
198 else if (tag == JVM_CONSTANT_MethodType) {
199 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
200 const u2 signature_index = cfs->get_u2_fast();
201 cp->method_type_index_at_put(index, signature_index);
202 }
203 else {
204 ShouldNotReachHere();
205 }
206 break;
207 }
208 case JVM_CONSTANT_Dynamic : {
209 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
210 classfile_parse_error(
211 "Class file version does not support constant tag %u in class file %s",
212 tag, CHECK);
213 }
214 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
215 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
216 const u2 name_and_type_index = cfs->get_u2_fast();
217 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
218 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
219 }
220 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
221 break;
222 }
223 case JVM_CONSTANT_InvokeDynamic : {
224 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
225 classfile_parse_error(
226 "Class file version does not support constant tag %u in class file %s",
227 tag, CHECK);
228 }
229 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
230 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
231 const u2 name_and_type_index = cfs->get_u2_fast();
232 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
233 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
234 }
235 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
236 break;
237 }
238 case JVM_CONSTANT_Integer: {
239 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
240 const u4 bytes = cfs->get_u4_fast();
241 cp->int_at_put(index, (jint)bytes);
242 break;
243 }
244 case JVM_CONSTANT_Float: {
245 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
246 const u4 bytes = cfs->get_u4_fast();
247 cp->float_at_put(index, *(jfloat*)&bytes);
248 break;
249 }
250 case JVM_CONSTANT_Long: {
251 // A mangled type might cause you to overrun allocated memory
252 guarantee_property(index + 1 < length,
253 "Invalid constant pool entry %u in class file %s",
254 index,
255 CHECK);
256 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
257 const u8 bytes = cfs->get_u8_fast();
258 cp->long_at_put(index, bytes);
259 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
260 break;
261 }
262 case JVM_CONSTANT_Double: {
263 // A mangled type might cause you to overrun allocated memory
264 guarantee_property(index+1 < length,
265 "Invalid constant pool entry %u in class file %s",
266 index,
267 CHECK);
268 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
269 const u8 bytes = cfs->get_u8_fast();
270 cp->double_at_put(index, *(jdouble*)&bytes);
271 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
272 break;
273 }
274 case JVM_CONSTANT_NameAndType: {
275 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
276 const u2 name_index = cfs->get_u2_fast();
277 const u2 signature_index = cfs->get_u2_fast();
278 cp->name_and_type_at_put(index, name_index, signature_index);
279 break;
280 }
281 case JVM_CONSTANT_Utf8 : {
282 cfs->guarantee_more(2, CHECK); // utf8_length
283 u2 utf8_length = cfs->get_u2_fast();
284 const u1* utf8_buffer = cfs->current();
285 assert(utf8_buffer != NULL, "null utf8 buffer");
286 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
287 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
288 cfs->skip_u1_fast(utf8_length);
289
290 // Before storing the symbol, make sure it's legal
291 if (_need_verify) {
292 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
293 }
294
295 if (has_cp_patch_at(index)) {
296 Handle patch = clear_cp_patch_at(index);
297 guarantee_property(java_lang_String::is_instance(patch()),
298 "Illegal utf8 patch at %d in class file %s",
299 index,
300 CHECK);
301 const char* const str = java_lang_String::as_utf8_string(patch());
302 // (could use java_lang_String::as_symbol instead, but might as well batch them)
303 utf8_buffer = (const u1*) str;
304 utf8_length = (int) strlen(str);
305 }
306
307 unsigned int hash;
308 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
309 utf8_length,
310 hash);
311 if (result == NULL) {
312 names[names_count] = (const char*)utf8_buffer;
313 lengths[names_count] = utf8_length;
314 indices[names_count] = index;
315 hashValues[names_count++] = hash;
316 if (names_count == SymbolTable::symbol_alloc_batch_size) {
317 SymbolTable::new_symbols(_loader_data,
318 cp,
319 names_count,
320 names,
321 lengths,
322 indices,
323 hashValues,
324 CHECK);
325 names_count = 0;
326 }
327 } else {
328 cp->symbol_at_put(index, result);
329 }
330 break;
331 }
332 case 19:
333 case 20: {
334 // Record that an error occurred in these two cases but keep parsing so
335 // that ACC_Module can be checked for in the access_flags. Need to
336 // throw NoClassDefFoundError in that case.
337 if (_major_version >= JAVA_9_VERSION) {
338 cfs->guarantee_more(3, CHECK);
339 cfs->get_u2_fast();
340 set_class_bad_constant_seen(tag);
341 break;
342 }
343 }
344 default: {
345 classfile_parse_error("Unknown constant tag %u in class file %s",
346 tag,
347 CHECK);
348 break;
349 }
350 } // end of switch(tag)
351 } // end of for
352
353 // Allocate the remaining symbols
354 if (names_count > 0) {
355 SymbolTable::new_symbols(_loader_data,
356 cp,
357 names_count,
358 names,
359 lengths,
360 indices,
361 hashValues,
362 CHECK);
363 }
364
365 // Copy _current pointer of local copy back to stream.
366 assert(stream->current() == old_current, "non-exclusive use of stream");
367 stream->set_current(cfs1.current());
368
369 }
370
371 static inline bool valid_cp_range(int index, int length) {
372 return (index > 0 && index < length);
373 }
374
375 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
376 assert(cp != NULL, "invariant");
377 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
378 return cp->symbol_at(index);
379 }
380 return NULL;
381 }
382
383 #ifdef ASSERT
384 PRAGMA_DIAG_PUSH
385 PRAGMA_FORMAT_NONLITERAL_IGNORED
386 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
387 ResourceMark rm(THREAD);
388 fatal(msg, _class_name->as_C_string());
389 }
390
391 void ClassFileParser::report_assert_property_failure(const char* msg,
392 int index,
393 TRAPS) const {
394 ResourceMark rm(THREAD);
395 fatal(msg, index, _class_name->as_C_string());
396 }
397 PRAGMA_DIAG_POP
398 #endif
399
400 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
401 ConstantPool* const cp,
402 const int length,
403 TRAPS) {
404 assert(cp != NULL, "invariant");
405 assert(stream != NULL, "invariant");
406
407 // parsing constant pool entries
408 parse_constant_pool_entries(stream, cp, length, CHECK);
409 if (class_bad_constant_seen() != 0) {
410 // a bad CP entry has been detected previously so stop parsing and just return.
411 return;
412 }
413
414 int index = 1; // declared outside of loops for portability
415 int num_klasses = 0;
416
417 // first verification pass - validate cross references
418 // and fixup class and string constants
419 for (index = 1; index < length; index++) { // Index 0 is unused
420 const jbyte tag = cp->tag_at(index).value();
421 switch (tag) {
422 case JVM_CONSTANT_Class: {
423 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
424 break;
425 }
426 case JVM_CONSTANT_Fieldref:
427 // fall through
428 case JVM_CONSTANT_Methodref:
429 // fall through
430 case JVM_CONSTANT_InterfaceMethodref: {
431 if (!_need_verify) break;
432 const int klass_ref_index = cp->klass_ref_index_at(index);
433 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
434 check_property(valid_klass_reference_at(klass_ref_index),
435 "Invalid constant pool index %u in class file %s",
436 klass_ref_index, CHECK);
437 check_property(valid_cp_range(name_and_type_ref_index, length) &&
438 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
439 "Invalid constant pool index %u in class file %s",
440 name_and_type_ref_index, CHECK);
441 break;
442 }
443 case JVM_CONSTANT_String: {
444 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
445 break;
446 }
447 case JVM_CONSTANT_Integer:
448 break;
449 case JVM_CONSTANT_Float:
450 break;
451 case JVM_CONSTANT_Long:
452 case JVM_CONSTANT_Double: {
453 index++;
454 check_property(
455 (index < length && cp->tag_at(index).is_invalid()),
456 "Improper constant pool long/double index %u in class file %s",
457 index, CHECK);
458 break;
459 }
460 case JVM_CONSTANT_NameAndType: {
461 if (!_need_verify) break;
462 const int name_ref_index = cp->name_ref_index_at(index);
463 const int signature_ref_index = cp->signature_ref_index_at(index);
464 check_property(valid_symbol_at(name_ref_index),
465 "Invalid constant pool index %u in class file %s",
466 name_ref_index, CHECK);
467 check_property(valid_symbol_at(signature_ref_index),
468 "Invalid constant pool index %u in class file %s",
469 signature_ref_index, CHECK);
470 break;
471 }
472 case JVM_CONSTANT_Utf8:
473 break;
474 case JVM_CONSTANT_UnresolvedClass: // fall-through
475 case JVM_CONSTANT_UnresolvedClassInError: {
476 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
477 break;
478 }
479 case JVM_CONSTANT_ClassIndex: {
480 const int class_index = cp->klass_index_at(index);
481 check_property(valid_symbol_at(class_index),
482 "Invalid constant pool index %u in class file %s",
483 class_index, CHECK);
484 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
485 break;
486 }
487 case JVM_CONSTANT_StringIndex: {
488 const int string_index = cp->string_index_at(index);
489 check_property(valid_symbol_at(string_index),
490 "Invalid constant pool index %u in class file %s",
491 string_index, CHECK);
492 Symbol* const sym = cp->symbol_at(string_index);
493 cp->unresolved_string_at_put(index, sym);
494 break;
495 }
496 case JVM_CONSTANT_MethodHandle: {
497 const int ref_index = cp->method_handle_index_at(index);
498 check_property(valid_cp_range(ref_index, length),
499 "Invalid constant pool index %u in class file %s",
500 ref_index, CHECK);
501 const constantTag tag = cp->tag_at(ref_index);
502 const int ref_kind = cp->method_handle_ref_kind_at(index);
503
504 switch (ref_kind) {
505 case JVM_REF_getField:
506 case JVM_REF_getStatic:
507 case JVM_REF_putField:
508 case JVM_REF_putStatic: {
509 check_property(
510 tag.is_field(),
511 "Invalid constant pool index %u in class file %s (not a field)",
512 ref_index, CHECK);
513 break;
514 }
515 case JVM_REF_invokeVirtual:
516 case JVM_REF_newInvokeSpecial: {
517 check_property(
518 tag.is_method(),
519 "Invalid constant pool index %u in class file %s (not a method)",
520 ref_index, CHECK);
521 break;
522 }
523 case JVM_REF_invokeStatic:
524 case JVM_REF_invokeSpecial: {
525 check_property(
526 tag.is_method() ||
527 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
528 "Invalid constant pool index %u in class file %s (not a method)",
529 ref_index, CHECK);
530 break;
531 }
532 case JVM_REF_invokeInterface: {
533 check_property(
534 tag.is_interface_method(),
535 "Invalid constant pool index %u in class file %s (not an interface method)",
536 ref_index, CHECK);
537 break;
538 }
539 default: {
540 classfile_parse_error(
541 "Bad method handle kind at constant pool index %u in class file %s",
542 index, CHECK);
543 }
544 } // switch(refkind)
545 // Keep the ref_index unchanged. It will be indirected at link-time.
546 break;
547 } // case MethodHandle
548 case JVM_CONSTANT_MethodType: {
549 const int ref_index = cp->method_type_index_at(index);
550 check_property(valid_symbol_at(ref_index),
551 "Invalid constant pool index %u in class file %s",
552 ref_index, CHECK);
553 break;
554 }
555 case JVM_CONSTANT_Dynamic: {
556 const int name_and_type_ref_index =
557 cp->invoke_dynamic_name_and_type_ref_index_at(index);
558
559 check_property(valid_cp_range(name_and_type_ref_index, length) &&
560 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
561 "Invalid constant pool index %u in class file %s",
562 name_and_type_ref_index, CHECK);
563 // bootstrap specifier index must be checked later,
564 // when BootstrapMethods attr is available
565
566 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
567 cp->set_has_dynamic_constant();
568 break;
569 }
570 case JVM_CONSTANT_InvokeDynamic: {
571 const int name_and_type_ref_index =
572 cp->invoke_dynamic_name_and_type_ref_index_at(index);
573
574 check_property(valid_cp_range(name_and_type_ref_index, length) &&
575 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
576 "Invalid constant pool index %u in class file %s",
577 name_and_type_ref_index, CHECK);
578 // bootstrap specifier index must be checked later,
579 // when BootstrapMethods attr is available
580 break;
581 }
582 default: {
583 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
584 ShouldNotReachHere();
585 break;
586 }
587 } // switch(tag)
588 } // end of for
589
590 _first_patched_klass_resolved_index = num_klasses;
591 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
592
593 if (_cp_patches != NULL) {
594 // need to treat this_class specially...
595
596 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
597 // for now. These will be replaced with actual names of the patched classes in patch_class().
598 Symbol* s = vmSymbols::star_name();
599 for (int n=_orig_cp_size; n<cp->length(); n++) {
600 cp->symbol_at_put(n, s);
601 }
602
603 int this_class_index;
604 {
605 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
606 const u1* const mark = stream->current();
607 stream->skip_u2_fast(1); // skip flags
608 this_class_index = stream->get_u2_fast();
609 stream->set_current(mark); // revert to mark
610 }
611
612 for (index = 1; index < length; index++) { // Index 0 is unused
613 if (has_cp_patch_at(index)) {
614 guarantee_property(index != this_class_index,
615 "Illegal constant pool patch to self at %d in class file %s",
616 index, CHECK);
617 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
618 }
619 }
620 }
621
622 if (!_need_verify) {
623 return;
624 }
625
626 // second verification pass - checks the strings are of the right format.
627 // but not yet to the other entries
628 for (index = 1; index < length; index++) {
629 const jbyte tag = cp->tag_at(index).value();
630 switch (tag) {
631 case JVM_CONSTANT_UnresolvedClass: {
632 const Symbol* const class_name = cp->klass_name_at(index);
633 // check the name, even if _cp_patches will overwrite it
634 verify_legal_class_name(class_name, CHECK);
635 break;
636 }
637 case JVM_CONSTANT_NameAndType: {
638 if (_need_verify) {
639 const int sig_index = cp->signature_ref_index_at(index);
640 const int name_index = cp->name_ref_index_at(index);
641 const Symbol* const name = cp->symbol_at(name_index);
642 const Symbol* const sig = cp->symbol_at(sig_index);
643 guarantee_property(sig->utf8_length() != 0,
644 "Illegal zero length constant pool entry at %d in class %s",
645 sig_index, CHECK);
646 guarantee_property(name->utf8_length() != 0,
647 "Illegal zero length constant pool entry at %d in class %s",
648 name_index, CHECK);
649
650 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
651 // Format check method name and signature
652 verify_legal_method_name(name, CHECK);
653 verify_legal_method_signature(name, sig, CHECK);
654 } else {
655 // Format check field name and signature
656 verify_legal_field_name(name, CHECK);
657 verify_legal_field_signature(name, sig, CHECK);
658 }
659 }
660 break;
661 }
662 case JVM_CONSTANT_Dynamic: {
663 const int name_and_type_ref_index =
664 cp->name_and_type_ref_index_at(index);
665 // already verified to be utf8
666 const int name_ref_index =
667 cp->name_ref_index_at(name_and_type_ref_index);
668 // already verified to be utf8
669 const int signature_ref_index =
670 cp->signature_ref_index_at(name_and_type_ref_index);
671 const Symbol* const name = cp->symbol_at(name_ref_index);
672 const Symbol* const signature = cp->symbol_at(signature_ref_index);
673 if (_need_verify) {
674 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
675 // Need only to be sure signature is non-zero length and the right type.
676 if (signature->utf8_length() == 0 ||
677 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
678 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
679 }
680 }
681 break;
682 }
683 case JVM_CONSTANT_InvokeDynamic:
684 case JVM_CONSTANT_Fieldref:
685 case JVM_CONSTANT_Methodref:
686 case JVM_CONSTANT_InterfaceMethodref: {
687 const int name_and_type_ref_index =
688 cp->name_and_type_ref_index_at(index);
689 // already verified to be utf8
690 const int name_ref_index =
691 cp->name_ref_index_at(name_and_type_ref_index);
692 // already verified to be utf8
693 const int signature_ref_index =
694 cp->signature_ref_index_at(name_and_type_ref_index);
695 const Symbol* const name = cp->symbol_at(name_ref_index);
696 const Symbol* const signature = cp->symbol_at(signature_ref_index);
697 if (tag == JVM_CONSTANT_Fieldref) {
698 if (_need_verify) {
699 // Field name and signature are verified above, when iterating NameAndType_info.
700 // Need only to be sure signature is non-zero length and the right type.
701 if (signature->utf8_length() == 0 ||
702 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
703 throwIllegalSignature("Field", name, signature, CHECK);
704 }
705 }
706 } else {
707 if (_need_verify) {
708 // Method name and signature are verified above, when iterating NameAndType_info.
709 // Need only to be sure signature is non-zero length and the right type.
710 if (signature->utf8_length() == 0 ||
711 signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
712 throwIllegalSignature("Method", name, signature, CHECK);
713 }
714 }
715 // 4509014: If a class method name begins with '<', it must be "<init>"
716 const unsigned int name_len = name->utf8_length();
717 if (tag == JVM_CONSTANT_Methodref &&
718 name_len != 0 &&
719 name->byte_at(0) == '<' &&
720 name != vmSymbols::object_initializer_name()) {
721 classfile_parse_error(
722 "Bad method name at constant pool index %u in class file %s",
723 name_ref_index, CHECK);
724 }
725 }
726 break;
727 }
728 case JVM_CONSTANT_MethodHandle: {
729 const int ref_index = cp->method_handle_index_at(index);
730 const int ref_kind = cp->method_handle_ref_kind_at(index);
731 switch (ref_kind) {
732 case JVM_REF_invokeVirtual:
733 case JVM_REF_invokeStatic:
734 case JVM_REF_invokeSpecial:
735 case JVM_REF_newInvokeSpecial: {
736 const int name_and_type_ref_index =
737 cp->name_and_type_ref_index_at(ref_index);
738 const int name_ref_index =
739 cp->name_ref_index_at(name_and_type_ref_index);
740 const Symbol* const name = cp->symbol_at(name_ref_index);
741 if (ref_kind == JVM_REF_newInvokeSpecial) {
742 if (name != vmSymbols::object_initializer_name()) {
743 classfile_parse_error(
744 "Bad constructor name at constant pool index %u in class file %s",
745 name_ref_index, CHECK);
746 }
747 } else {
748 if (name == vmSymbols::object_initializer_name()) {
749 classfile_parse_error(
750 "Bad method name at constant pool index %u in class file %s",
751 name_ref_index, CHECK);
752 }
753 }
754 break;
755 }
756 // Other ref_kinds are already fully checked in previous pass.
757 } // switch(ref_kind)
758 break;
759 }
760 case JVM_CONSTANT_MethodType: {
761 const Symbol* const no_name = vmSymbols::type_name(); // place holder
762 const Symbol* const signature = cp->method_type_signature_at(index);
763 verify_legal_method_signature(no_name, signature, CHECK);
764 break;
765 }
766 case JVM_CONSTANT_Utf8: {
767 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
768 }
769 } // switch(tag)
770 } // end of for
771 }
772
773 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
774 int name_index = _orig_cp_size + _num_patched_klasses;
775 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
776
777 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
778 _num_patched_klasses ++;
779 }
780
781 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
782 int index,
783 Handle patch,
784 TRAPS) {
785 assert(cp != NULL, "invariant");
786
787 BasicType patch_type = T_VOID;
788
789 switch (cp->tag_at(index).value()) {
790
791 case JVM_CONSTANT_UnresolvedClass: {
792 // Patching a class means pre-resolving it.
793 // The name in the constant pool is ignored.
794 if (java_lang_Class::is_instance(patch())) {
795 guarantee_property(!java_lang_Class::is_primitive(patch()),
796 "Illegal class patch at %d in class file %s",
797 index, CHECK);
798 Klass* k = java_lang_Class::as_Klass(patch());
799 patch_class(cp, index, k, k->name());
800 } else {
801 guarantee_property(java_lang_String::is_instance(patch()),
802 "Illegal class patch at %d in class file %s",
803 index, CHECK);
804 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK);
805 patch_class(cp, index, NULL, name);
806 }
807 break;
808 }
809
810 case JVM_CONSTANT_String: {
811 // skip this patch and don't clear it. Needs the oop array for resolved
812 // references to be created first.
813 return;
814 }
815 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
816 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
817 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
818 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
819 patch_prim:
820 {
821 jvalue value;
822 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
823 guarantee_property(value_type == patch_type,
824 "Illegal primitive patch at %d in class file %s",
825 index, CHECK);
826 switch (value_type) {
827 case T_INT: cp->int_at_put(index, value.i); break;
828 case T_FLOAT: cp->float_at_put(index, value.f); break;
829 case T_LONG: cp->long_at_put(index, value.j); break;
830 case T_DOUBLE: cp->double_at_put(index, value.d); break;
831 default: assert(false, "");
832 }
833 } // end patch_prim label
834 break;
835
836 default: {
837 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
838 guarantee_property(!has_cp_patch_at(index),
839 "Illegal unexpected patch at %d in class file %s",
840 index, CHECK);
841 return;
842 }
843 } // end of switch(tag)
844
845 // On fall-through, mark the patch as used.
846 clear_cp_patch_at(index);
847 }
848 class NameSigHash: public ResourceObj {
849 public:
850 const Symbol* _name; // name
851 const Symbol* _sig; // signature
852 NameSigHash* _next; // Next entry in hash table
853 };
854
855 static const int HASH_ROW_SIZE = 256;
856
857 static unsigned int hash(const Symbol* name, const Symbol* sig) {
858 unsigned int raw_hash = 0;
859 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
860 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
861
862 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
863 }
864
865
866 static void initialize_hashtable(NameSigHash** table) {
867 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
868 }
869 // Return false if the name/sig combination is found in table.
870 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
871 // The old format checker uses heap sort to find duplicates.
872 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
873 // of table since we don't expect Symbol*'s to move.
874 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
875 assert(name != NULL, "name in constant pool is NULL");
876
877 // First lookup for duplicates
878 int index = hash(name, sig);
879 NameSigHash* entry = table[index];
880 while (entry != NULL) {
881 if (entry->_name == name && entry->_sig == sig) {
882 return false;
883 }
884 entry = entry->_next;
885 }
886
887 // No duplicate is found, allocate a new entry and fill it.
888 entry = new NameSigHash();
889 entry->_name = name;
890 entry->_sig = sig;
891
892 // Insert into hash table
893 entry->_next = table[index];
894 table[index] = entry;
895
896 return true;
897 }
898
899 // Side-effects: populates the _local_interfaces field
900 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
901 const int itfs_len,
902 ConstantPool* const cp,
903 bool* const has_nonstatic_concrete_methods,
904 TRAPS) {
905 assert(stream != NULL, "invariant");
906 assert(cp != NULL, "invariant");
907 assert(has_nonstatic_concrete_methods != NULL, "invariant");
908
909 if (itfs_len == 0) {
910 _local_interfaces = Universe::the_empty_klass_array();
911 } else {
912 assert(itfs_len > 0, "only called for len>0");
913 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, itfs_len, NULL, CHECK);
914
915 int index;
916 for (index = 0; index < itfs_len; index++) {
917 const u2 interface_index = stream->get_u2(CHECK);
918 Klass* interf;
919 check_property(
920 valid_klass_reference_at(interface_index),
921 "Interface name has bad constant pool index %u in class file %s",
922 interface_index, CHECK);
923 if (cp->tag_at(interface_index).is_klass()) {
924 interf = cp->resolved_klass_at(interface_index);
925 } else {
926 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
927
928 // Don't need to check legal name because it's checked when parsing constant pool.
929 // But need to make sure it's not an array type.
930 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
931 "Bad interface name in class file %s", CHECK);
932
933 // Call resolve_super so classcircularity is checked
934 interf = SystemDictionary::resolve_super_or_fail(
935 _class_name,
936 unresolved_klass,
937 Handle(THREAD, _loader_data->class_loader()),
938 _protection_domain,
939 false,
940 CHECK);
941 }
942
943 if (!interf->is_interface()) {
944 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
945 "Implementing class");
946 }
947
948 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
949 *has_nonstatic_concrete_methods = true;
950 }
951 _local_interfaces->at_put(index, interf);
952 }
953
954 if (!_need_verify || itfs_len <= 1) {
955 return;
956 }
957
958 // Check if there's any duplicates in interfaces
959 ResourceMark rm(THREAD);
960 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
961 NameSigHash*,
962 HASH_ROW_SIZE);
963 initialize_hashtable(interface_names);
964 bool dup = false;
965 const Symbol* name = NULL;
966 {
967 debug_only(NoSafepointVerifier nsv;)
968 for (index = 0; index < itfs_len; index++) {
969 const Klass* const k = _local_interfaces->at(index);
970 name = InstanceKlass::cast(k)->name();
971 // If no duplicates, add (name, NULL) in hashtable interface_names.
972 if (!put_after_lookup(name, NULL, interface_names)) {
973 dup = true;
974 break;
975 }
976 }
977 }
978 if (dup) {
979 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
980 name->as_C_string(), CHECK);
981 }
982 }
983 }
984
985 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
986 int constantvalue_index,
987 int signature_index,
988 TRAPS) const {
989 // Make sure the constant pool entry is of a type appropriate to this field
990 guarantee_property(
991 (constantvalue_index > 0 &&
992 constantvalue_index < cp->length()),
993 "Bad initial value index %u in ConstantValue attribute in class file %s",
994 constantvalue_index, CHECK);
995
996 const constantTag value_type = cp->tag_at(constantvalue_index);
997 switch(cp->basic_type_for_signature_at(signature_index)) {
998 case T_LONG: {
999 guarantee_property(value_type.is_long(),
1000 "Inconsistent constant value type in class file %s",
1001 CHECK);
1002 break;
1003 }
1004 case T_FLOAT: {
1005 guarantee_property(value_type.is_float(),
1006 "Inconsistent constant value type in class file %s",
1007 CHECK);
1008 break;
1009 }
1010 case T_DOUBLE: {
1011 guarantee_property(value_type.is_double(),
1012 "Inconsistent constant value type in class file %s",
1013 CHECK);
1014 break;
1015 }
1016 case T_BYTE:
1017 case T_CHAR:
1018 case T_SHORT:
1019 case T_BOOLEAN:
1020 case T_INT: {
1021 guarantee_property(value_type.is_int(),
1022 "Inconsistent constant value type in class file %s",
1023 CHECK);
1024 break;
1025 }
1026 case T_OBJECT: {
1027 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1028 && value_type.is_string()),
1029 "Bad string initial value in class file %s",
1030 CHECK);
1031 break;
1032 }
1033 default: {
1034 classfile_parse_error("Unable to set initial value %u in class file %s",
1035 constantvalue_index,
1036 CHECK);
1037 }
1038 }
1039 }
1040
1041 class AnnotationCollector : public ResourceObj{
1042 public:
1043 enum Location { _in_field, _in_method, _in_class };
1044 enum ID {
1045 _unknown = 0,
1046 _method_CallerSensitive,
1047 _method_ForceInline,
1048 _method_DontInline,
1049 _method_InjectedProfile,
1050 _method_LambdaForm_Compiled,
1051 _method_LambdaForm_Hidden,
1052 _method_HotSpotIntrinsicCandidate,
1053 _jdk_internal_vm_annotation_Contended,
1054 _field_Stable,
1055 _jdk_internal_vm_annotation_ReservedStackAccess,
1056 _annotation_LIMIT
1057 };
1058 const Location _location;
1059 int _annotations_present;
1060 u2 _contended_group;
1061
1062 AnnotationCollector(Location location)
1063 : _location(location), _annotations_present(0)
1064 {
1065 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1066 }
1067 // If this annotation name has an ID, report it (or _none).
1068 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1069 // Set the annotation name:
1070 void set_annotation(ID id) {
1071 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1072 _annotations_present |= nth_bit((int)id);
1073 }
1074
1075 void remove_annotation(ID id) {
1076 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1077 _annotations_present &= ~nth_bit((int)id);
1078 }
1079
1080 // Report if the annotation is present.
1081 bool has_any_annotations() const { return _annotations_present != 0; }
1082 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1083
1084 void set_contended_group(u2 group) { _contended_group = group; }
1085 u2 contended_group() const { return _contended_group; }
1086
1087 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1088
1089 void set_stable(bool stable) { set_annotation(_field_Stable); }
1090 bool is_stable() const { return has_annotation(_field_Stable); }
1091 };
1092
1093 // This class also doubles as a holder for metadata cleanup.
1094 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1095 private:
1096 ClassLoaderData* _loader_data;
1097 AnnotationArray* _field_annotations;
1098 AnnotationArray* _field_type_annotations;
1099 public:
1100 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1101 AnnotationCollector(_in_field),
1102 _loader_data(loader_data),
1103 _field_annotations(NULL),
1104 _field_type_annotations(NULL) {}
1105 ~FieldAnnotationCollector();
1106 void apply_to(FieldInfo* f);
1107 AnnotationArray* field_annotations() { return _field_annotations; }
1108 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1109
1110 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1111 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1112 };
1113
1114 class MethodAnnotationCollector : public AnnotationCollector{
1115 public:
1116 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1117 void apply_to(const methodHandle& m);
1118 };
1119
1120 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1121 public:
1122 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1123 void apply_to(InstanceKlass* ik);
1124 };
1125
1126
1127 static int skip_annotation_value(const u1*, int, int); // fwd decl
1128
1129 // Safely increment index by val if does not pass limit
1130 #define SAFE_ADD(index, limit, val) \
1131 if (index >= limit - val) return limit; \
1132 index += val;
1133
1134 // Skip an annotation. Return >=limit if there is any problem.
1135 static int skip_annotation(const u1* buffer, int limit, int index) {
1136 assert(buffer != NULL, "invariant");
1137 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1138 // value := switch (tag:u1) { ... }
1139 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1140 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1141 while (--nmem >= 0 && index < limit) {
1142 SAFE_ADD(index, limit, 2); // skip member
1143 index = skip_annotation_value(buffer, limit, index);
1144 }
1145 return index;
1146 }
1147
1148 // Skip an annotation value. Return >=limit if there is any problem.
1149 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1150 assert(buffer != NULL, "invariant");
1151
1152 // value := switch (tag:u1) {
1153 // case B, C, I, S, Z, D, F, J, c: con:u2;
1154 // case e: e_class:u2 e_name:u2;
1155 // case s: s_con:u2;
1156 // case [: do(nval:u2) {value};
1157 // case @: annotation;
1158 // case s: s_con:u2;
1159 // }
1160 SAFE_ADD(index, limit, 1); // read tag
1161 const u1 tag = buffer[index - 1];
1162 switch (tag) {
1163 case 'B':
1164 case 'C':
1165 case 'I':
1166 case 'S':
1167 case 'Z':
1168 case 'D':
1169 case 'F':
1170 case 'J':
1171 case 'c':
1172 case 's':
1173 SAFE_ADD(index, limit, 2); // skip con or s_con
1174 break;
1175 case 'e':
1176 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1177 break;
1178 case '[':
1179 {
1180 SAFE_ADD(index, limit, 2); // read nval
1181 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1182 while (--nval >= 0 && index < limit) {
1183 index = skip_annotation_value(buffer, limit, index);
1184 }
1185 }
1186 break;
1187 case '@':
1188 index = skip_annotation(buffer, limit, index);
1189 break;
1190 default:
1191 return limit; // bad tag byte
1192 }
1193 return index;
1194 }
1195
1196 // Sift through annotations, looking for those significant to the VM:
1197 static void parse_annotations(const ConstantPool* const cp,
1198 const u1* buffer, int limit,
1199 AnnotationCollector* coll,
1200 ClassLoaderData* loader_data,
1201 TRAPS) {
1202
1203 assert(cp != NULL, "invariant");
1204 assert(buffer != NULL, "invariant");
1205 assert(coll != NULL, "invariant");
1206 assert(loader_data != NULL, "invariant");
1207
1208 // annotations := do(nann:u2) {annotation}
1209 int index = 2; // read nann
1210 if (index >= limit) return;
1211 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1212 enum { // initial annotation layout
1213 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1214 count_off = 2, // u2 such as 1 (one value)
1215 member_off = 4, // utf8 such as 'value'
1216 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1217 e_tag_val = 'e',
1218 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1219 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1220 e_size = 11, // end of 'e' annotation
1221 c_tag_val = 'c', // payload is type
1222 c_con_off = 7, // utf8 payload, such as 'I'
1223 c_size = 9, // end of 'c' annotation
1224 s_tag_val = 's', // payload is String
1225 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1226 s_size = 9,
1227 min_size = 6 // smallest possible size (zero members)
1228 };
1229 // Cannot add min_size to index in case of overflow MAX_INT
1230 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1231 int index0 = index;
1232 index = skip_annotation(buffer, limit, index);
1233 const u1* const abase = buffer + index0;
1234 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1235 const int count = Bytes::get_Java_u2((address)abase + count_off);
1236 const Symbol* const aname = check_symbol_at(cp, atype);
1237 if (aname == NULL) break; // invalid annotation name
1238 const Symbol* member = NULL;
1239 if (count >= 1) {
1240 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1241 member = check_symbol_at(cp, member_index);
1242 if (member == NULL) break; // invalid member name
1243 }
1244
1245 // Here is where parsing particular annotations will take place.
1246 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1247 if (AnnotationCollector::_unknown == id) continue;
1248 coll->set_annotation(id);
1249
1250 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1251 // @Contended can optionally specify the contention group.
1252 //
1253 // Contended group defines the equivalence class over the fields:
1254 // the fields within the same contended group are not treated distinct.
1255 // The only exception is default group, which does not incur the
1256 // equivalence. Naturally, contention group for classes is meaningless.
1257 //
1258 // While the contention group is specified as String, annotation
1259 // values are already interned, and we might as well use the constant
1260 // pool index as the group tag.
1261 //
1262 u2 group_index = 0; // default contended group
1263 if (count == 1
1264 && s_size == (index - index0) // match size
1265 && s_tag_val == *(abase + tag_off)
1266 && member == vmSymbols::value_name()) {
1267 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1268 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1269 group_index = 0; // default contended group
1270 }
1271 }
1272 coll->set_contended_group(group_index);
1273 }
1274 }
1275 }
1276
1277
1278 // Parse attributes for a field.
1279 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1280 u2 attributes_count,
1281 bool is_static, u2 signature_index,
1282 u2* const constantvalue_index_addr,
1283 bool* const is_synthetic_addr,
1284 u2* const generic_signature_index_addr,
1285 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1286 TRAPS) {
1287 assert(cfs != NULL, "invariant");
1288 assert(constantvalue_index_addr != NULL, "invariant");
1289 assert(is_synthetic_addr != NULL, "invariant");
1290 assert(generic_signature_index_addr != NULL, "invariant");
1291 assert(parsed_annotations != NULL, "invariant");
1292 assert(attributes_count > 0, "attributes_count should be greater than 0");
1293
1294 u2 constantvalue_index = 0;
1295 u2 generic_signature_index = 0;
1296 bool is_synthetic = false;
1297 const u1* runtime_visible_annotations = NULL;
1298 int runtime_visible_annotations_length = 0;
1299 const u1* runtime_invisible_annotations = NULL;
1300 int runtime_invisible_annotations_length = 0;
1301 const u1* runtime_visible_type_annotations = NULL;
1302 int runtime_visible_type_annotations_length = 0;
1303 const u1* runtime_invisible_type_annotations = NULL;
1304 int runtime_invisible_type_annotations_length = 0;
1305 bool runtime_invisible_annotations_exists = false;
1306 bool runtime_invisible_type_annotations_exists = false;
1307 const ConstantPool* const cp = _cp;
1308
1309 while (attributes_count--) {
1310 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1311 const u2 attribute_name_index = cfs->get_u2_fast();
1312 const u4 attribute_length = cfs->get_u4_fast();
1313 check_property(valid_symbol_at(attribute_name_index),
1314 "Invalid field attribute index %u in class file %s",
1315 attribute_name_index,
1316 CHECK);
1317
1318 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1319 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1320 // ignore if non-static
1321 if (constantvalue_index != 0) {
1322 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1323 }
1324 check_property(
1325 attribute_length == 2,
1326 "Invalid ConstantValue field attribute length %u in class file %s",
1327 attribute_length, CHECK);
1328
1329 constantvalue_index = cfs->get_u2(CHECK);
1330 if (_need_verify) {
1331 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1332 }
1333 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1334 if (attribute_length != 0) {
1335 classfile_parse_error(
1336 "Invalid Synthetic field attribute length %u in class file %s",
1337 attribute_length, CHECK);
1338 }
1339 is_synthetic = true;
1340 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1341 if (attribute_length != 0) {
1342 classfile_parse_error(
1343 "Invalid Deprecated field attribute length %u in class file %s",
1344 attribute_length, CHECK);
1345 }
1346 } else if (_major_version >= JAVA_1_5_VERSION) {
1347 if (attribute_name == vmSymbols::tag_signature()) {
1348 if (generic_signature_index != 0) {
1349 classfile_parse_error(
1350 "Multiple Signature attributes for field in class file %s", CHECK);
1351 }
1352 if (attribute_length != 2) {
1353 classfile_parse_error(
1354 "Wrong size %u for field's Signature attribute in class file %s",
1355 attribute_length, CHECK);
1356 }
1357 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1358 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1359 if (runtime_visible_annotations != NULL) {
1360 classfile_parse_error(
1361 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1362 }
1363 runtime_visible_annotations_length = attribute_length;
1364 runtime_visible_annotations = cfs->current();
1365 assert(runtime_visible_annotations != NULL, "null visible annotations");
1366 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1367 parse_annotations(cp,
1368 runtime_visible_annotations,
1369 runtime_visible_annotations_length,
1370 parsed_annotations,
1371 _loader_data,
1372 CHECK);
1373 cfs->skip_u1_fast(runtime_visible_annotations_length);
1374 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1375 if (runtime_invisible_annotations_exists) {
1376 classfile_parse_error(
1377 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1378 }
1379 runtime_invisible_annotations_exists = true;
1380 if (PreserveAllAnnotations) {
1381 runtime_invisible_annotations_length = attribute_length;
1382 runtime_invisible_annotations = cfs->current();
1383 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1384 }
1385 cfs->skip_u1(attribute_length, CHECK);
1386 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1387 if (runtime_visible_type_annotations != NULL) {
1388 classfile_parse_error(
1389 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1390 }
1391 runtime_visible_type_annotations_length = attribute_length;
1392 runtime_visible_type_annotations = cfs->current();
1393 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1394 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1395 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1396 if (runtime_invisible_type_annotations_exists) {
1397 classfile_parse_error(
1398 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1399 } else {
1400 runtime_invisible_type_annotations_exists = true;
1401 }
1402 if (PreserveAllAnnotations) {
1403 runtime_invisible_type_annotations_length = attribute_length;
1404 runtime_invisible_type_annotations = cfs->current();
1405 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1406 }
1407 cfs->skip_u1(attribute_length, CHECK);
1408 } else {
1409 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1410 }
1411 } else {
1412 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1413 }
1414 }
1415
1416 *constantvalue_index_addr = constantvalue_index;
1417 *is_synthetic_addr = is_synthetic;
1418 *generic_signature_index_addr = generic_signature_index;
1419 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1420 runtime_visible_annotations_length,
1421 runtime_invisible_annotations,
1422 runtime_invisible_annotations_length,
1423 CHECK);
1424 parsed_annotations->set_field_annotations(a);
1425 a = assemble_annotations(runtime_visible_type_annotations,
1426 runtime_visible_type_annotations_length,
1427 runtime_invisible_type_annotations,
1428 runtime_invisible_type_annotations_length,
1429 CHECK);
1430 parsed_annotations->set_field_type_annotations(a);
1431 return;
1432 }
1433
1434
1435 // Field allocation types. Used for computing field offsets.
1436
1437 enum FieldAllocationType {
1438 STATIC_OOP, // Oops
1439 STATIC_BYTE, // Boolean, Byte, char
1440 STATIC_SHORT, // shorts
1441 STATIC_WORD, // ints
1442 STATIC_DOUBLE, // aligned long or double
1443 NONSTATIC_OOP,
1444 NONSTATIC_BYTE,
1445 NONSTATIC_SHORT,
1446 NONSTATIC_WORD,
1447 NONSTATIC_DOUBLE,
1448 MAX_FIELD_ALLOCATION_TYPE,
1449 BAD_ALLOCATION_TYPE = -1
1450 };
1451
1452 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1453 BAD_ALLOCATION_TYPE, // 0
1454 BAD_ALLOCATION_TYPE, // 1
1455 BAD_ALLOCATION_TYPE, // 2
1456 BAD_ALLOCATION_TYPE, // 3
1457 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1458 NONSTATIC_SHORT, // T_CHAR = 5,
1459 NONSTATIC_WORD, // T_FLOAT = 6,
1460 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1461 NONSTATIC_BYTE, // T_BYTE = 8,
1462 NONSTATIC_SHORT, // T_SHORT = 9,
1463 NONSTATIC_WORD, // T_INT = 10,
1464 NONSTATIC_DOUBLE, // T_LONG = 11,
1465 NONSTATIC_OOP, // T_OBJECT = 12,
1466 NONSTATIC_OOP, // T_ARRAY = 13,
1467 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1468 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1469 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1470 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1471 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1472 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1473 BAD_ALLOCATION_TYPE, // 0
1474 BAD_ALLOCATION_TYPE, // 1
1475 BAD_ALLOCATION_TYPE, // 2
1476 BAD_ALLOCATION_TYPE, // 3
1477 STATIC_BYTE , // T_BOOLEAN = 4,
1478 STATIC_SHORT, // T_CHAR = 5,
1479 STATIC_WORD, // T_FLOAT = 6,
1480 STATIC_DOUBLE, // T_DOUBLE = 7,
1481 STATIC_BYTE, // T_BYTE = 8,
1482 STATIC_SHORT, // T_SHORT = 9,
1483 STATIC_WORD, // T_INT = 10,
1484 STATIC_DOUBLE, // T_LONG = 11,
1485 STATIC_OOP, // T_OBJECT = 12,
1486 STATIC_OOP, // T_ARRAY = 13,
1487 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1488 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1489 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1490 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1491 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1492 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1493 };
1494
1495 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1496 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1497 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1498 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1499 return result;
1500 }
1501
1502 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1503 public:
1504 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1505
1506 FieldAllocationCount() {
1507 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1508 count[i] = 0;
1509 }
1510 }
1511
1512 FieldAllocationType update(bool is_static, BasicType type) {
1513 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1514 if (atype != BAD_ALLOCATION_TYPE) {
1515 // Make sure there is no overflow with injected fields.
1516 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1517 count[atype]++;
1518 }
1519 return atype;
1520 }
1521 };
1522
1523 // Side-effects: populates the _fields, _fields_annotations,
1524 // _fields_type_annotations fields
1525 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1526 bool is_interface,
1527 FieldAllocationCount* const fac,
1528 ConstantPool* cp,
1529 const int cp_size,
1530 u2* const java_fields_count_ptr,
1531 TRAPS) {
1532
1533 assert(cfs != NULL, "invariant");
1534 assert(fac != NULL, "invariant");
1535 assert(cp != NULL, "invariant");
1536 assert(java_fields_count_ptr != NULL, "invariant");
1537
1538 assert(NULL == _fields, "invariant");
1539 assert(NULL == _fields_annotations, "invariant");
1540 assert(NULL == _fields_type_annotations, "invariant");
1541
1542 cfs->guarantee_more(2, CHECK); // length
1543 const u2 length = cfs->get_u2_fast();
1544 *java_fields_count_ptr = length;
1545
1546 int num_injected = 0;
1547 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1548 &num_injected);
1549 const int total_fields = length + num_injected;
1550
1551 // The field array starts with tuples of shorts
1552 // [access, name index, sig index, initial value index, byte offset].
1553 // A generic signature slot only exists for field with generic
1554 // signature attribute. And the access flag is set with
1555 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1556 // signature slots are at the end of the field array and after all
1557 // other fields data.
1558 //
1559 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1560 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1561 // ...
1562 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1563 // [generic signature index]
1564 // [generic signature index]
1565 // ...
1566 //
1567 // Allocate a temporary resource array for field data. For each field,
1568 // a slot is reserved in the temporary array for the generic signature
1569 // index. After parsing all fields, the data are copied to a permanent
1570 // array and any unused slots will be discarded.
1571 ResourceMark rm(THREAD);
1572 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1573 u2,
1574 total_fields * (FieldInfo::field_slots + 1));
1575
1576 // The generic signature slots start after all other fields' data.
1577 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1578 int num_generic_signature = 0;
1579 for (int n = 0; n < length; n++) {
1580 // access_flags, name_index, descriptor_index, attributes_count
1581 cfs->guarantee_more(8, CHECK);
1582
1583 AccessFlags access_flags;
1584 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1585 verify_legal_field_modifiers(flags, is_interface, CHECK);
1586 access_flags.set_flags(flags);
1587
1588 const u2 name_index = cfs->get_u2_fast();
1589 check_property(valid_symbol_at(name_index),
1590 "Invalid constant pool index %u for field name in class file %s",
1591 name_index, CHECK);
1592 const Symbol* const name = cp->symbol_at(name_index);
1593 verify_legal_field_name(name, CHECK);
1594
1595 const u2 signature_index = cfs->get_u2_fast();
1596 check_property(valid_symbol_at(signature_index),
1597 "Invalid constant pool index %u for field signature in class file %s",
1598 signature_index, CHECK);
1599 const Symbol* const sig = cp->symbol_at(signature_index);
1600 verify_legal_field_signature(name, sig, CHECK);
1601
1602 u2 constantvalue_index = 0;
1603 bool is_synthetic = false;
1604 u2 generic_signature_index = 0;
1605 const bool is_static = access_flags.is_static();
1606 FieldAnnotationCollector parsed_annotations(_loader_data);
1607
1608 const u2 attributes_count = cfs->get_u2_fast();
1609 if (attributes_count > 0) {
1610 parse_field_attributes(cfs,
1611 attributes_count,
1612 is_static,
1613 signature_index,
1614 &constantvalue_index,
1615 &is_synthetic,
1616 &generic_signature_index,
1617 &parsed_annotations,
1618 CHECK);
1619
1620 if (parsed_annotations.field_annotations() != NULL) {
1621 if (_fields_annotations == NULL) {
1622 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1623 _loader_data, length, NULL,
1624 CHECK);
1625 }
1626 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1627 parsed_annotations.set_field_annotations(NULL);
1628 }
1629 if (parsed_annotations.field_type_annotations() != NULL) {
1630 if (_fields_type_annotations == NULL) {
1631 _fields_type_annotations =
1632 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1633 length,
1634 NULL,
1635 CHECK);
1636 }
1637 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1638 parsed_annotations.set_field_type_annotations(NULL);
1639 }
1640
1641 if (is_synthetic) {
1642 access_flags.set_is_synthetic();
1643 }
1644 if (generic_signature_index != 0) {
1645 access_flags.set_field_has_generic_signature();
1646 fa[generic_signature_slot] = generic_signature_index;
1647 generic_signature_slot ++;
1648 num_generic_signature ++;
1649 }
1650 }
1651
1652 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1653 field->initialize(access_flags.as_short(),
1654 name_index,
1655 signature_index,
1656 constantvalue_index);
1657 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1658
1659 // Remember how many oops we encountered and compute allocation type
1660 const FieldAllocationType atype = fac->update(is_static, type);
1661 field->set_allocation_type(atype);
1662
1663 // After field is initialized with type, we can augment it with aux info
1664 if (parsed_annotations.has_any_annotations())
1665 parsed_annotations.apply_to(field);
1666 }
1667
1668 int index = length;
1669 if (num_injected != 0) {
1670 for (int n = 0; n < num_injected; n++) {
1671 // Check for duplicates
1672 if (injected[n].may_be_java) {
1673 const Symbol* const name = injected[n].name();
1674 const Symbol* const signature = injected[n].signature();
1675 bool duplicate = false;
1676 for (int i = 0; i < length; i++) {
1677 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1678 if (name == cp->symbol_at(f->name_index()) &&
1679 signature == cp->symbol_at(f->signature_index())) {
1680 // Symbol is desclared in Java so skip this one
1681 duplicate = true;
1682 break;
1683 }
1684 }
1685 if (duplicate) {
1686 // These will be removed from the field array at the end
1687 continue;
1688 }
1689 }
1690
1691 // Injected field
1692 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1693 field->initialize(JVM_ACC_FIELD_INTERNAL,
1694 injected[n].name_index,
1695 injected[n].signature_index,
1696 0);
1697
1698 const BasicType type = FieldType::basic_type(injected[n].signature());
1699
1700 // Remember how many oops we encountered and compute allocation type
1701 const FieldAllocationType atype = fac->update(false, type);
1702 field->set_allocation_type(atype);
1703 index++;
1704 }
1705 }
1706
1707 assert(NULL == _fields, "invariant");
1708
1709 _fields =
1710 MetadataFactory::new_array<u2>(_loader_data,
1711 index * FieldInfo::field_slots + num_generic_signature,
1712 CHECK);
1713 // Sometimes injected fields already exist in the Java source so
1714 // the fields array could be too long. In that case the
1715 // fields array is trimed. Also unused slots that were reserved
1716 // for generic signature indexes are discarded.
1717 {
1718 int i = 0;
1719 for (; i < index * FieldInfo::field_slots; i++) {
1720 _fields->at_put(i, fa[i]);
1721 }
1722 for (int j = total_fields * FieldInfo::field_slots;
1723 j < generic_signature_slot; j++) {
1724 _fields->at_put(i++, fa[j]);
1725 }
1726 assert(_fields->length() == i, "");
1727 }
1728
1729 if (_need_verify && length > 1) {
1730 // Check duplicated fields
1731 ResourceMark rm(THREAD);
1732 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1733 THREAD, NameSigHash*, HASH_ROW_SIZE);
1734 initialize_hashtable(names_and_sigs);
1735 bool dup = false;
1736 const Symbol* name = NULL;
1737 const Symbol* sig = NULL;
1738 {
1739 debug_only(NoSafepointVerifier nsv;)
1740 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1741 name = fs.name();
1742 sig = fs.signature();
1743 // If no duplicates, add name/signature in hashtable names_and_sigs.
1744 if (!put_after_lookup(name, sig, names_and_sigs)) {
1745 dup = true;
1746 break;
1747 }
1748 }
1749 }
1750 if (dup) {
1751 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1752 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1753 }
1754 }
1755 }
1756
1757
1758 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1759 u4 code_length,
1760 u4 exception_table_length,
1761 TRAPS) {
1762 assert(cfs != NULL, "invariant");
1763
1764 const unsafe_u2* const exception_table_start = cfs->current();
1765 assert(exception_table_start != NULL, "null exception table");
1766
1767 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1768 // end_pc,
1769 // handler_pc,
1770 // catch_type_index
1771
1772 // Will check legal target after parsing code array in verifier.
1773 if (_need_verify) {
1774 for (unsigned int i = 0; i < exception_table_length; i++) {
1775 const u2 start_pc = cfs->get_u2_fast();
1776 const u2 end_pc = cfs->get_u2_fast();
1777 const u2 handler_pc = cfs->get_u2_fast();
1778 const u2 catch_type_index = cfs->get_u2_fast();
1779 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1780 "Illegal exception table range in class file %s",
1781 CHECK_NULL);
1782 guarantee_property(handler_pc < code_length,
1783 "Illegal exception table handler in class file %s",
1784 CHECK_NULL);
1785 if (catch_type_index != 0) {
1786 guarantee_property(valid_klass_reference_at(catch_type_index),
1787 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1788 }
1789 }
1790 } else {
1791 cfs->skip_u2_fast(exception_table_length * 4);
1792 }
1793 return exception_table_start;
1794 }
1795
1796 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1797 u4 code_length,
1798 CompressedLineNumberWriteStream**const write_stream,
1799 TRAPS) {
1800
1801 const ClassFileStream* const cfs = _stream;
1802 unsigned int num_entries = cfs->get_u2(CHECK);
1803
1804 // Each entry is a u2 start_pc, and a u2 line_number
1805 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1806
1807 // Verify line number attribute and table length
1808 check_property(
1809 code_attribute_length == sizeof(u2) + length_in_bytes,
1810 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1811
1812 cfs->guarantee_more(length_in_bytes, CHECK);
1813
1814 if ((*write_stream) == NULL) {
1815 if (length_in_bytes > fixed_buffer_size) {
1816 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1817 } else {
1818 (*write_stream) = new CompressedLineNumberWriteStream(
1819 _linenumbertable_buffer, fixed_buffer_size);
1820 }
1821 }
1822
1823 while (num_entries-- > 0) {
1824 const u2 bci = cfs->get_u2_fast(); // start_pc
1825 const u2 line = cfs->get_u2_fast(); // line_number
1826 guarantee_property(bci < code_length,
1827 "Invalid pc in LineNumberTable in class file %s", CHECK);
1828 (*write_stream)->write_pair(bci, line);
1829 }
1830 }
1831
1832
1833 class LVT_Hash : public AllStatic {
1834 public:
1835
1836 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1837 /*
1838 * 3-tuple start_bci/length/slot has to be unique key,
1839 * so the following comparison seems to be redundant:
1840 * && elem->name_cp_index == entry->_elem->name_cp_index
1841 */
1842 return (e0.start_bci == e1.start_bci &&
1843 e0.length == e1.length &&
1844 e0.name_cp_index == e1.name_cp_index &&
1845 e0.slot == e1.slot);
1846 }
1847
1848 static unsigned int hash(LocalVariableTableElement const& e0) {
1849 unsigned int raw_hash = e0.start_bci;
1850
1851 raw_hash = e0.length + raw_hash * 37;
1852 raw_hash = e0.name_cp_index + raw_hash * 37;
1853 raw_hash = e0.slot + raw_hash * 37;
1854
1855 return raw_hash;
1856 }
1857 };
1858
1859
1860 // Class file LocalVariableTable elements.
1861 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1862 public:
1863 u2 start_bci;
1864 u2 length;
1865 u2 name_cp_index;
1866 u2 descriptor_cp_index;
1867 u2 slot;
1868 };
1869
1870 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1871 LocalVariableTableElement* const lvt) {
1872 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1873 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1874 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1875 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1876 lvt->signature_cp_index = 0;
1877 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1878 }
1879
1880 // Function is used to parse both attributes:
1881 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1882 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1883 u4 code_length,
1884 u2 max_locals,
1885 u4 code_attribute_length,
1886 u2* const localvariable_table_length,
1887 bool isLVTT,
1888 TRAPS) {
1889 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1890 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1891 const unsigned int size =
1892 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1893
1894 const ConstantPool* const cp = _cp;
1895
1896 // Verify local variable table attribute has right length
1897 if (_need_verify) {
1898 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1899 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1900 }
1901
1902 const unsafe_u2* const localvariable_table_start = cfs->current();
1903 assert(localvariable_table_start != NULL, "null local variable table");
1904 if (!_need_verify) {
1905 cfs->skip_u2_fast(size);
1906 } else {
1907 cfs->guarantee_more(size * 2, CHECK_NULL);
1908 for(int i = 0; i < (*localvariable_table_length); i++) {
1909 const u2 start_pc = cfs->get_u2_fast();
1910 const u2 length = cfs->get_u2_fast();
1911 const u2 name_index = cfs->get_u2_fast();
1912 const u2 descriptor_index = cfs->get_u2_fast();
1913 const u2 index = cfs->get_u2_fast();
1914 // Assign to a u4 to avoid overflow
1915 const u4 end_pc = (u4)start_pc + (u4)length;
1916
1917 if (start_pc >= code_length) {
1918 classfile_parse_error(
1919 "Invalid start_pc %u in %s in class file %s",
1920 start_pc, tbl_name, CHECK_NULL);
1921 }
1922 if (end_pc > code_length) {
1923 classfile_parse_error(
1924 "Invalid length %u in %s in class file %s",
1925 length, tbl_name, CHECK_NULL);
1926 }
1927 const int cp_size = cp->length();
1928 guarantee_property(valid_symbol_at(name_index),
1929 "Name index %u in %s has bad constant type in class file %s",
1930 name_index, tbl_name, CHECK_NULL);
1931 guarantee_property(valid_symbol_at(descriptor_index),
1932 "Signature index %u in %s has bad constant type in class file %s",
1933 descriptor_index, tbl_name, CHECK_NULL);
1934
1935 const Symbol* const name = cp->symbol_at(name_index);
1936 const Symbol* const sig = cp->symbol_at(descriptor_index);
1937 verify_legal_field_name(name, CHECK_NULL);
1938 u2 extra_slot = 0;
1939 if (!isLVTT) {
1940 verify_legal_field_signature(name, sig, CHECK_NULL);
1941
1942 // 4894874: check special cases for double and long local variables
1943 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1944 sig == vmSymbols::type_signature(T_LONG)) {
1945 extra_slot = 1;
1946 }
1947 }
1948 guarantee_property((index + extra_slot) < max_locals,
1949 "Invalid index %u in %s in class file %s",
1950 index, tbl_name, CHECK_NULL);
1951 }
1952 }
1953 return localvariable_table_start;
1954 }
1955
1956
1957 void ClassFileParser::parse_type_array(u2 array_length,
1958 u4 code_length,
1959 u4* const u1_index,
1960 u4* const u2_index,
1961 u1* const u1_array,
1962 u2* const u2_array,
1963 TRAPS) {
1964 const ClassFileStream* const cfs = _stream;
1965 u2 index = 0; // index in the array with long/double occupying two slots
1966 u4 i1 = *u1_index;
1967 u4 i2 = *u2_index + 1;
1968 for(int i = 0; i < array_length; i++) {
1969 const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1970 index++;
1971 if (tag == ITEM_Long || tag == ITEM_Double) {
1972 index++;
1973 } else if (tag == ITEM_Object) {
1974 const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1975 guarantee_property(valid_klass_reference_at(class_index),
1976 "Bad class index %u in StackMap in class file %s",
1977 class_index, CHECK);
1978 } else if (tag == ITEM_Uninitialized) {
1979 const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1980 guarantee_property(
1981 offset < code_length,
1982 "Bad uninitialized type offset %u in StackMap in class file %s",
1983 offset, CHECK);
1984 } else {
1985 guarantee_property(
1986 tag <= (u1)ITEM_Uninitialized,
1987 "Unknown variable type %u in StackMap in class file %s",
1988 tag, CHECK);
1989 }
1990 }
1991 u2_array[*u2_index] = index;
1992 *u1_index = i1;
1993 *u2_index = i2;
1994 }
1995
1996 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1997 u4 code_attribute_length,
1998 bool need_verify,
1999 TRAPS) {
2000 assert(cfs != NULL, "invariant");
2001
2002 if (0 == code_attribute_length) {
2003 return NULL;
2004 }
2005
2006 const u1* const stackmap_table_start = cfs->current();
2007 assert(stackmap_table_start != NULL, "null stackmap table");
2008
2009 // check code_attribute_length first
2010 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2011
2012 if (!need_verify && !DumpSharedSpaces) {
2013 return NULL;
2014 }
2015 return stackmap_table_start;
2016 }
2017
2018 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2019 u2* const checked_exceptions_length,
2020 u4 method_attribute_length,
2021 TRAPS) {
2022 assert(cfs != NULL, "invariant");
2023 assert(checked_exceptions_length != NULL, "invariant");
2024
2025 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2026 *checked_exceptions_length = cfs->get_u2_fast();
2027 const unsigned int size =
2028 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2029 const unsafe_u2* const checked_exceptions_start = cfs->current();
2030 assert(checked_exceptions_start != NULL, "null checked exceptions");
2031 if (!_need_verify) {
2032 cfs->skip_u2_fast(size);
2033 } else {
2034 // Verify each value in the checked exception table
2035 u2 checked_exception;
2036 const u2 len = *checked_exceptions_length;
2037 cfs->guarantee_more(2 * len, CHECK_NULL);
2038 for (int i = 0; i < len; i++) {
2039 checked_exception = cfs->get_u2_fast();
2040 check_property(
2041 valid_klass_reference_at(checked_exception),
2042 "Exception name has bad type at constant pool %u in class file %s",
2043 checked_exception, CHECK_NULL);
2044 }
2045 }
2046 // check exceptions attribute length
2047 if (_need_verify) {
2048 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2049 sizeof(u2) * size),
2050 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2051 }
2052 return checked_exceptions_start;
2053 }
2054
2055 void ClassFileParser::throwIllegalSignature(const char* type,
2056 const Symbol* name,
2057 const Symbol* sig,
2058 TRAPS) const {
2059 assert(name != NULL, "invariant");
2060 assert(sig != NULL, "invariant");
2061
2062 ResourceMark rm(THREAD);
2063 Exceptions::fthrow(THREAD_AND_LOCATION,
2064 vmSymbols::java_lang_ClassFormatError(),
2065 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2066 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2067 }
2068
2069 AnnotationCollector::ID
2070 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2071 const Symbol* name) {
2072 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2073 // Privileged code can use all annotations. Other code silently drops some.
2074 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2075 loader_data->is_platform_class_loader_data() ||
2076 loader_data->is_anonymous();
2077 switch (sid) {
2078 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2079 if (_location != _in_method) break; // only allow for methods
2080 if (!privileged) break; // only allow in privileged code
2081 return _method_CallerSensitive;
2082 }
2083 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2084 if (_location != _in_method) break; // only allow for methods
2085 if (!privileged) break; // only allow in privileged code
2086 return _method_ForceInline;
2087 }
2088 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2089 if (_location != _in_method) break; // only allow for methods
2090 if (!privileged) break; // only allow in privileged code
2091 return _method_DontInline;
2092 }
2093 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2094 if (_location != _in_method) break; // only allow for methods
2095 if (!privileged) break; // only allow in privileged code
2096 return _method_InjectedProfile;
2097 }
2098 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2099 if (_location != _in_method) break; // only allow for methods
2100 if (!privileged) break; // only allow in privileged code
2101 return _method_LambdaForm_Compiled;
2102 }
2103 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): {
2104 if (_location != _in_method) break; // only allow for methods
2105 if (!privileged) break; // only allow in privileged code
2106 return _method_LambdaForm_Hidden;
2107 }
2108 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2109 if (_location != _in_method) break; // only allow for methods
2110 if (!privileged) break; // only allow in privileged code
2111 return _method_HotSpotIntrinsicCandidate;
2112 }
2113 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2114 if (_location != _in_field) break; // only allow for fields
2115 if (!privileged) break; // only allow in privileged code
2116 return _field_Stable;
2117 }
2118 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2119 if (_location != _in_field && _location != _in_class) {
2120 break; // only allow for fields and classes
2121 }
2122 if (!EnableContended || (RestrictContended && !privileged)) {
2123 break; // honor privileges
2124 }
2125 return _jdk_internal_vm_annotation_Contended;
2126 }
2127 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2128 if (_location != _in_method) break; // only allow for methods
2129 if (RestrictReservedStack && !privileged) break; // honor privileges
2130 return _jdk_internal_vm_annotation_ReservedStackAccess;
2131 }
2132 default: {
2133 break;
2134 }
2135 }
2136 return AnnotationCollector::_unknown;
2137 }
2138
2139 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2140 if (is_contended())
2141 f->set_contended_group(contended_group());
2142 if (is_stable())
2143 f->set_stable(true);
2144 }
2145
2146 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2147 // If there's an error deallocate metadata for field annotations
2148 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2149 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2150 }
2151
2152 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2153 if (has_annotation(_method_CallerSensitive))
2154 m->set_caller_sensitive(true);
2155 if (has_annotation(_method_ForceInline))
2156 m->set_force_inline(true);
2157 if (has_annotation(_method_DontInline))
2158 m->set_dont_inline(true);
2159 if (has_annotation(_method_InjectedProfile))
2160 m->set_has_injected_profile(true);
2161 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2162 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2163 if (has_annotation(_method_LambdaForm_Hidden))
2164 m->set_hidden(true);
2165 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2166 m->set_intrinsic_candidate(true);
2167 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2168 m->set_has_reserved_stack_access(true);
2169 }
2170
2171 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2172 assert(ik != NULL, "invariant");
2173 ik->set_is_contended(is_contended());
2174 }
2175
2176 #define MAX_ARGS_SIZE 255
2177 #define MAX_CODE_SIZE 65535
2178 #define INITIAL_MAX_LVT_NUMBER 256
2179
2180 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2181 *
2182 * Rules for LVT's and LVTT's are:
2183 * - There can be any number of LVT's and LVTT's.
2184 * - If there are n LVT's, it is the same as if there was just
2185 * one LVT containing all the entries from the n LVT's.
2186 * - There may be no more than one LVT entry per local variable.
2187 * Two LVT entries are 'equal' if these fields are the same:
2188 * start_pc, length, name, slot
2189 * - There may be no more than one LVTT entry per each LVT entry.
2190 * Each LVTT entry has to match some LVT entry.
2191 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2192 */
2193 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2194 int lvt_cnt,
2195 u2* const localvariable_table_length,
2196 const unsafe_u2** const localvariable_table_start,
2197 int lvtt_cnt,
2198 u2* const localvariable_type_table_length,
2199 const unsafe_u2** const localvariable_type_table_start,
2200 TRAPS) {
2201
2202 ResourceMark rm(THREAD);
2203
2204 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2205 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2206
2207 LVT_HashTable* const table = new LVT_HashTable();
2208
2209 // To fill LocalVariableTable in
2210 const Classfile_LVT_Element* cf_lvt;
2211 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2212
2213 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2214 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2215 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2216 copy_lvt_element(&cf_lvt[idx], lvt);
2217 // If no duplicates, add LVT elem in hashtable.
2218 if (table->put(*lvt, lvt) == false
2219 && _need_verify
2220 && _major_version >= JAVA_1_5_VERSION) {
2221 classfile_parse_error("Duplicated LocalVariableTable attribute "
2222 "entry for '%s' in class file %s",
2223 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2224 CHECK);
2225 }
2226 }
2227 }
2228
2229 // To merge LocalVariableTable and LocalVariableTypeTable
2230 const Classfile_LVT_Element* cf_lvtt;
2231 LocalVariableTableElement lvtt_elem;
2232
2233 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2234 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2235 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2236 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2237 LocalVariableTableElement** entry = table->get(lvtt_elem);
2238 if (entry == NULL) {
2239 if (_need_verify) {
2240 classfile_parse_error("LVTT entry for '%s' in class file %s "
2241 "does not match any LVT entry",
2242 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2243 CHECK);
2244 }
2245 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2246 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2247 "entry for '%s' in class file %s",
2248 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2249 CHECK);
2250 } else {
2251 // to add generic signatures into LocalVariableTable
2252 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2253 }
2254 }
2255 }
2256 }
2257
2258
2259 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2260 const u1* runtime_visible_annotations,
2261 int runtime_visible_annotations_length,
2262 const u1* runtime_invisible_annotations,
2263 int runtime_invisible_annotations_length,
2264 const u1* runtime_visible_parameter_annotations,
2265 int runtime_visible_parameter_annotations_length,
2266 const u1* runtime_invisible_parameter_annotations,
2267 int runtime_invisible_parameter_annotations_length,
2268 const u1* runtime_visible_type_annotations,
2269 int runtime_visible_type_annotations_length,
2270 const u1* runtime_invisible_type_annotations,
2271 int runtime_invisible_type_annotations_length,
2272 const u1* annotation_default,
2273 int annotation_default_length,
2274 TRAPS) {
2275
2276 AnnotationArray* a;
2277
2278 if (runtime_visible_annotations_length +
2279 runtime_invisible_annotations_length > 0) {
2280 a = assemble_annotations(runtime_visible_annotations,
2281 runtime_visible_annotations_length,
2282 runtime_invisible_annotations,
2283 runtime_invisible_annotations_length,
2284 CHECK);
2285 cm->set_method_annotations(a);
2286 }
2287
2288 if (runtime_visible_parameter_annotations_length +
2289 runtime_invisible_parameter_annotations_length > 0) {
2290 a = assemble_annotations(runtime_visible_parameter_annotations,
2291 runtime_visible_parameter_annotations_length,
2292 runtime_invisible_parameter_annotations,
2293 runtime_invisible_parameter_annotations_length,
2294 CHECK);
2295 cm->set_parameter_annotations(a);
2296 }
2297
2298 if (annotation_default_length > 0) {
2299 a = assemble_annotations(annotation_default,
2300 annotation_default_length,
2301 NULL,
2302 0,
2303 CHECK);
2304 cm->set_default_annotations(a);
2305 }
2306
2307 if (runtime_visible_type_annotations_length +
2308 runtime_invisible_type_annotations_length > 0) {
2309 a = assemble_annotations(runtime_visible_type_annotations,
2310 runtime_visible_type_annotations_length,
2311 runtime_invisible_type_annotations,
2312 runtime_invisible_type_annotations_length,
2313 CHECK);
2314 cm->set_type_annotations(a);
2315 }
2316 }
2317
2318
2319 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2320 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2321 // Method* to save footprint, so we only know the size of the resulting Method* when the
2322 // entire method attribute is parsed.
2323 //
2324 // The promoted_flags parameter is used to pass relevant access_flags
2325 // from the method back up to the containing klass. These flag values
2326 // are added to klass's access_flags.
2327
2328 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2329 bool is_interface,
2330 const ConstantPool* cp,
2331 AccessFlags* const promoted_flags,
2332 TRAPS) {
2333 assert(cfs != NULL, "invariant");
2334 assert(cp != NULL, "invariant");
2335 assert(promoted_flags != NULL, "invariant");
2336
2337 ResourceMark rm(THREAD);
2338 // Parse fixed parts:
2339 // access_flags, name_index, descriptor_index, attributes_count
2340 cfs->guarantee_more(8, CHECK_NULL);
2341
2342 int flags = cfs->get_u2_fast();
2343 const u2 name_index = cfs->get_u2_fast();
2344 const int cp_size = cp->length();
2345 check_property(
2346 valid_symbol_at(name_index),
2347 "Illegal constant pool index %u for method name in class file %s",
2348 name_index, CHECK_NULL);
2349 const Symbol* const name = cp->symbol_at(name_index);
2350 verify_legal_method_name(name, CHECK_NULL);
2351
2352 const u2 signature_index = cfs->get_u2_fast();
2353 guarantee_property(
2354 valid_symbol_at(signature_index),
2355 "Illegal constant pool index %u for method signature in class file %s",
2356 signature_index, CHECK_NULL);
2357 const Symbol* const signature = cp->symbol_at(signature_index);
2358
2359 if (name == vmSymbols::class_initializer_name()) {
2360 // We ignore the other access flags for a valid class initializer.
2361 // (JVM Spec 2nd ed., chapter 4.6)
2362 if (_major_version < 51) { // backward compatibility
2363 flags = JVM_ACC_STATIC;
2364 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2365 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2366 } else {
2367 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2368 }
2369 } else {
2370 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2371 }
2372
2373 if (name == vmSymbols::object_initializer_name() && is_interface) {
2374 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2375 }
2376
2377 int args_size = -1; // only used when _need_verify is true
2378 if (_need_verify) {
2379 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2380 verify_legal_method_signature(name, signature, CHECK_NULL);
2381 if (args_size > MAX_ARGS_SIZE) {
2382 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2383 }
2384 }
2385
2386 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2387
2388 // Default values for code and exceptions attribute elements
2389 u2 max_stack = 0;
2390 u2 max_locals = 0;
2391 u4 code_length = 0;
2392 const u1* code_start = 0;
2393 u2 exception_table_length = 0;
2394 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2395 Array<int>* exception_handlers = Universe::the_empty_int_array();
2396 u2 checked_exceptions_length = 0;
2397 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2398 CompressedLineNumberWriteStream* linenumber_table = NULL;
2399 int linenumber_table_length = 0;
2400 int total_lvt_length = 0;
2401 u2 lvt_cnt = 0;
2402 u2 lvtt_cnt = 0;
2403 bool lvt_allocated = false;
2404 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2405 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2406 u2* localvariable_table_length = NULL;
2407 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2408 u2* localvariable_type_table_length = NULL;
2409 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2410 int method_parameters_length = -1;
2411 const u1* method_parameters_data = NULL;
2412 bool method_parameters_seen = false;
2413 bool parsed_code_attribute = false;
2414 bool parsed_checked_exceptions_attribute = false;
2415 bool parsed_stackmap_attribute = false;
2416 // stackmap attribute - JDK1.5
2417 const u1* stackmap_data = NULL;
2418 int stackmap_data_length = 0;
2419 u2 generic_signature_index = 0;
2420 MethodAnnotationCollector parsed_annotations;
2421 const u1* runtime_visible_annotations = NULL;
2422 int runtime_visible_annotations_length = 0;
2423 const u1* runtime_invisible_annotations = NULL;
2424 int runtime_invisible_annotations_length = 0;
2425 const u1* runtime_visible_parameter_annotations = NULL;
2426 int runtime_visible_parameter_annotations_length = 0;
2427 const u1* runtime_invisible_parameter_annotations = NULL;
2428 int runtime_invisible_parameter_annotations_length = 0;
2429 const u1* runtime_visible_type_annotations = NULL;
2430 int runtime_visible_type_annotations_length = 0;
2431 const u1* runtime_invisible_type_annotations = NULL;
2432 int runtime_invisible_type_annotations_length = 0;
2433 bool runtime_invisible_annotations_exists = false;
2434 bool runtime_invisible_type_annotations_exists = false;
2435 bool runtime_invisible_parameter_annotations_exists = false;
2436 const u1* annotation_default = NULL;
2437 int annotation_default_length = 0;
2438
2439 // Parse code and exceptions attribute
2440 u2 method_attributes_count = cfs->get_u2_fast();
2441 while (method_attributes_count--) {
2442 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2443 const u2 method_attribute_name_index = cfs->get_u2_fast();
2444 const u4 method_attribute_length = cfs->get_u4_fast();
2445 check_property(
2446 valid_symbol_at(method_attribute_name_index),
2447 "Invalid method attribute name index %u in class file %s",
2448 method_attribute_name_index, CHECK_NULL);
2449
2450 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2451 if (method_attribute_name == vmSymbols::tag_code()) {
2452 // Parse Code attribute
2453 if (_need_verify) {
2454 guarantee_property(
2455 !access_flags.is_native() && !access_flags.is_abstract(),
2456 "Code attribute in native or abstract methods in class file %s",
2457 CHECK_NULL);
2458 }
2459 if (parsed_code_attribute) {
2460 classfile_parse_error("Multiple Code attributes in class file %s",
2461 CHECK_NULL);
2462 }
2463 parsed_code_attribute = true;
2464
2465 // Stack size, locals size, and code size
2466 if (_major_version == 45 && _minor_version <= 2) {
2467 cfs->guarantee_more(4, CHECK_NULL);
2468 max_stack = cfs->get_u1_fast();
2469 max_locals = cfs->get_u1_fast();
2470 code_length = cfs->get_u2_fast();
2471 } else {
2472 cfs->guarantee_more(8, CHECK_NULL);
2473 max_stack = cfs->get_u2_fast();
2474 max_locals = cfs->get_u2_fast();
2475 code_length = cfs->get_u4_fast();
2476 }
2477 if (_need_verify) {
2478 guarantee_property(args_size <= max_locals,
2479 "Arguments can't fit into locals in class file %s",
2480 CHECK_NULL);
2481 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2482 "Invalid method Code length %u in class file %s",
2483 code_length, CHECK_NULL);
2484 }
2485 // Code pointer
2486 code_start = cfs->current();
2487 assert(code_start != NULL, "null code start");
2488 cfs->guarantee_more(code_length, CHECK_NULL);
2489 cfs->skip_u1_fast(code_length);
2490
2491 // Exception handler table
2492 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2493 exception_table_length = cfs->get_u2_fast();
2494 if (exception_table_length > 0) {
2495 exception_table_start = parse_exception_table(cfs,
2496 code_length,
2497 exception_table_length,
2498 CHECK_NULL);
2499 }
2500
2501 // Parse additional attributes in code attribute
2502 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2503 u2 code_attributes_count = cfs->get_u2_fast();
2504
2505 unsigned int calculated_attribute_length = 0;
2506
2507 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2508 calculated_attribute_length =
2509 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2510 } else {
2511 // max_stack, locals and length are smaller in pre-version 45.2 classes
2512 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2513 }
2514 calculated_attribute_length +=
2515 code_length +
2516 sizeof(exception_table_length) +
2517 sizeof(code_attributes_count) +
2518 exception_table_length *
2519 ( sizeof(u2) + // start_pc
2520 sizeof(u2) + // end_pc
2521 sizeof(u2) + // handler_pc
2522 sizeof(u2) ); // catch_type_index
2523
2524 while (code_attributes_count--) {
2525 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2526 const u2 code_attribute_name_index = cfs->get_u2_fast();
2527 const u4 code_attribute_length = cfs->get_u4_fast();
2528 calculated_attribute_length += code_attribute_length +
2529 sizeof(code_attribute_name_index) +
2530 sizeof(code_attribute_length);
2531 check_property(valid_symbol_at(code_attribute_name_index),
2532 "Invalid code attribute name index %u in class file %s",
2533 code_attribute_name_index,
2534 CHECK_NULL);
2535 if (LoadLineNumberTables &&
2536 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2537 // Parse and compress line number table
2538 parse_linenumber_table(code_attribute_length,
2539 code_length,
2540 &linenumber_table,
2541 CHECK_NULL);
2542
2543 } else if (LoadLocalVariableTables &&
2544 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2545 // Parse local variable table
2546 if (!lvt_allocated) {
2547 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2548 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2549 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2550 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2551 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2552 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2553 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2554 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2555 lvt_allocated = true;
2556 }
2557 if (lvt_cnt == max_lvt_cnt) {
2558 max_lvt_cnt <<= 1;
2559 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2560 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2561 }
2562 localvariable_table_start[lvt_cnt] =
2563 parse_localvariable_table(cfs,
2564 code_length,
2565 max_locals,
2566 code_attribute_length,
2567 &localvariable_table_length[lvt_cnt],
2568 false, // is not LVTT
2569 CHECK_NULL);
2570 total_lvt_length += localvariable_table_length[lvt_cnt];
2571 lvt_cnt++;
2572 } else if (LoadLocalVariableTypeTables &&
2573 _major_version >= JAVA_1_5_VERSION &&
2574 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2575 if (!lvt_allocated) {
2576 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2577 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2578 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2579 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2580 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2581 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2582 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2583 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2584 lvt_allocated = true;
2585 }
2586 // Parse local variable type table
2587 if (lvtt_cnt == max_lvtt_cnt) {
2588 max_lvtt_cnt <<= 1;
2589 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2590 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2591 }
2592 localvariable_type_table_start[lvtt_cnt] =
2593 parse_localvariable_table(cfs,
2594 code_length,
2595 max_locals,
2596 code_attribute_length,
2597 &localvariable_type_table_length[lvtt_cnt],
2598 true, // is LVTT
2599 CHECK_NULL);
2600 lvtt_cnt++;
2601 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2602 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2603 // Stack map is only needed by the new verifier in JDK1.5.
2604 if (parsed_stackmap_attribute) {
2605 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2606 }
2607 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2608 stackmap_data_length = code_attribute_length;
2609 parsed_stackmap_attribute = true;
2610 } else {
2611 // Skip unknown attributes
2612 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2613 }
2614 }
2615 // check method attribute length
2616 if (_need_verify) {
2617 guarantee_property(method_attribute_length == calculated_attribute_length,
2618 "Code segment has wrong length in class file %s",
2619 CHECK_NULL);
2620 }
2621 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2622 // Parse Exceptions attribute
2623 if (parsed_checked_exceptions_attribute) {
2624 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2625 CHECK_NULL);
2626 }
2627 parsed_checked_exceptions_attribute = true;
2628 checked_exceptions_start =
2629 parse_checked_exceptions(cfs,
2630 &checked_exceptions_length,
2631 method_attribute_length,
2632 CHECK_NULL);
2633 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2634 // reject multiple method parameters
2635 if (method_parameters_seen) {
2636 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2637 CHECK_NULL);
2638 }
2639 method_parameters_seen = true;
2640 method_parameters_length = cfs->get_u1_fast();
2641 const u2 real_length = (method_parameters_length * 4u) + 1u;
2642 if (method_attribute_length != real_length) {
2643 classfile_parse_error(
2644 "Invalid MethodParameters method attribute length %u in class file",
2645 method_attribute_length, CHECK_NULL);
2646 }
2647 method_parameters_data = cfs->current();
2648 cfs->skip_u2_fast(method_parameters_length);
2649 cfs->skip_u2_fast(method_parameters_length);
2650 // ignore this attribute if it cannot be reflected
2651 if (!SystemDictionary::Parameter_klass_loaded())
2652 method_parameters_length = -1;
2653 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2654 if (method_attribute_length != 0) {
2655 classfile_parse_error(
2656 "Invalid Synthetic method attribute length %u in class file %s",
2657 method_attribute_length, CHECK_NULL);
2658 }
2659 // Should we check that there hasn't already been a synthetic attribute?
2660 access_flags.set_is_synthetic();
2661 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2662 if (method_attribute_length != 0) {
2663 classfile_parse_error(
2664 "Invalid Deprecated method attribute length %u in class file %s",
2665 method_attribute_length, CHECK_NULL);
2666 }
2667 } else if (_major_version >= JAVA_1_5_VERSION) {
2668 if (method_attribute_name == vmSymbols::tag_signature()) {
2669 if (generic_signature_index != 0) {
2670 classfile_parse_error(
2671 "Multiple Signature attributes for method in class file %s",
2672 CHECK_NULL);
2673 }
2674 if (method_attribute_length != 2) {
2675 classfile_parse_error(
2676 "Invalid Signature attribute length %u in class file %s",
2677 method_attribute_length, CHECK_NULL);
2678 }
2679 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2680 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2681 if (runtime_visible_annotations != NULL) {
2682 classfile_parse_error(
2683 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2684 CHECK_NULL);
2685 }
2686 runtime_visible_annotations_length = method_attribute_length;
2687 runtime_visible_annotations = cfs->current();
2688 assert(runtime_visible_annotations != NULL, "null visible annotations");
2689 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2690 parse_annotations(cp,
2691 runtime_visible_annotations,
2692 runtime_visible_annotations_length,
2693 &parsed_annotations,
2694 _loader_data,
2695 CHECK_NULL);
2696 cfs->skip_u1_fast(runtime_visible_annotations_length);
2697 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2698 if (runtime_invisible_annotations_exists) {
2699 classfile_parse_error(
2700 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2701 CHECK_NULL);
2702 }
2703 runtime_invisible_annotations_exists = true;
2704 if (PreserveAllAnnotations) {
2705 runtime_invisible_annotations_length = method_attribute_length;
2706 runtime_invisible_annotations = cfs->current();
2707 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2708 }
2709 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2710 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2711 if (runtime_visible_parameter_annotations != NULL) {
2712 classfile_parse_error(
2713 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2714 CHECK_NULL);
2715 }
2716 runtime_visible_parameter_annotations_length = method_attribute_length;
2717 runtime_visible_parameter_annotations = cfs->current();
2718 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2719 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2720 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2721 if (runtime_invisible_parameter_annotations_exists) {
2722 classfile_parse_error(
2723 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2724 CHECK_NULL);
2725 }
2726 runtime_invisible_parameter_annotations_exists = true;
2727 if (PreserveAllAnnotations) {
2728 runtime_invisible_parameter_annotations_length = method_attribute_length;
2729 runtime_invisible_parameter_annotations = cfs->current();
2730 assert(runtime_invisible_parameter_annotations != NULL,
2731 "null invisible parameter annotations");
2732 }
2733 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2734 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2735 if (annotation_default != NULL) {
2736 classfile_parse_error(
2737 "Multiple AnnotationDefault attributes for method in class file %s",
2738 CHECK_NULL);
2739 }
2740 annotation_default_length = method_attribute_length;
2741 annotation_default = cfs->current();
2742 assert(annotation_default != NULL, "null annotation default");
2743 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2744 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2745 if (runtime_visible_type_annotations != NULL) {
2746 classfile_parse_error(
2747 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2748 CHECK_NULL);
2749 }
2750 runtime_visible_type_annotations_length = method_attribute_length;
2751 runtime_visible_type_annotations = cfs->current();
2752 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2753 // No need for the VM to parse Type annotations
2754 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2755 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2756 if (runtime_invisible_type_annotations_exists) {
2757 classfile_parse_error(
2758 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2759 CHECK_NULL);
2760 } else {
2761 runtime_invisible_type_annotations_exists = true;
2762 }
2763 if (PreserveAllAnnotations) {
2764 runtime_invisible_type_annotations_length = method_attribute_length;
2765 runtime_invisible_type_annotations = cfs->current();
2766 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2767 }
2768 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2769 } else {
2770 // Skip unknown attributes
2771 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2772 }
2773 } else {
2774 // Skip unknown attributes
2775 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2776 }
2777 }
2778
2779 if (linenumber_table != NULL) {
2780 linenumber_table->write_terminator();
2781 linenumber_table_length = linenumber_table->position();
2782 }
2783
2784 // Make sure there's at least one Code attribute in non-native/non-abstract method
2785 if (_need_verify) {
2786 guarantee_property(access_flags.is_native() ||
2787 access_flags.is_abstract() ||
2788 parsed_code_attribute,
2789 "Absent Code attribute in method that is not native or abstract in class file %s",
2790 CHECK_NULL);
2791 }
2792
2793 // All sizing information for a Method* is finally available, now create it
2794 InlineTableSizes sizes(
2795 total_lvt_length,
2796 linenumber_table_length,
2797 exception_table_length,
2798 checked_exceptions_length,
2799 method_parameters_length,
2800 generic_signature_index,
2801 runtime_visible_annotations_length +
2802 runtime_invisible_annotations_length,
2803 runtime_visible_parameter_annotations_length +
2804 runtime_invisible_parameter_annotations_length,
2805 runtime_visible_type_annotations_length +
2806 runtime_invisible_type_annotations_length,
2807 annotation_default_length,
2808 0);
2809
2810 Method* const m = Method::allocate(_loader_data,
2811 code_length,
2812 access_flags,
2813 &sizes,
2814 ConstMethod::NORMAL,
2815 CHECK_NULL);
2816
2817 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2818
2819 // Fill in information from fixed part (access_flags already set)
2820 m->set_constants(_cp);
2821 m->set_name_index(name_index);
2822 m->set_signature_index(signature_index);
2823
2824 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2825 m->constMethod()->set_result_type(rtf.type());
2826
2827 if (args_size >= 0) {
2828 m->set_size_of_parameters(args_size);
2829 } else {
2830 m->compute_size_of_parameters(THREAD);
2831 }
2832 #ifdef ASSERT
2833 if (args_size >= 0) {
2834 m->compute_size_of_parameters(THREAD);
2835 assert(args_size == m->size_of_parameters(), "");
2836 }
2837 #endif
2838
2839 // Fill in code attribute information
2840 m->set_max_stack(max_stack);
2841 m->set_max_locals(max_locals);
2842 if (stackmap_data != NULL) {
2843 m->constMethod()->copy_stackmap_data(_loader_data,
2844 (u1*)stackmap_data,
2845 stackmap_data_length,
2846 CHECK_NULL);
2847 }
2848
2849 // Copy byte codes
2850 m->set_code((u1*)code_start);
2851
2852 // Copy line number table
2853 if (linenumber_table != NULL) {
2854 memcpy(m->compressed_linenumber_table(),
2855 linenumber_table->buffer(),
2856 linenumber_table_length);
2857 }
2858
2859 // Copy exception table
2860 if (exception_table_length > 0) {
2861 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2862 m->exception_table_start(),
2863 exception_table_length * sizeof(ExceptionTableElement),
2864 sizeof(u2));
2865 }
2866
2867 // Copy method parameters
2868 if (method_parameters_length > 0) {
2869 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2870 for (int i = 0; i < method_parameters_length; i++) {
2871 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2872 method_parameters_data += 2;
2873 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2874 method_parameters_data += 2;
2875 }
2876 }
2877
2878 // Copy checked exceptions
2879 if (checked_exceptions_length > 0) {
2880 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2881 m->checked_exceptions_start(),
2882 checked_exceptions_length * sizeof(CheckedExceptionElement),
2883 sizeof(u2));
2884 }
2885
2886 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2887 if (total_lvt_length > 0) {
2888 promoted_flags->set_has_localvariable_table();
2889 copy_localvariable_table(m->constMethod(),
2890 lvt_cnt,
2891 localvariable_table_length,
2892 localvariable_table_start,
2893 lvtt_cnt,
2894 localvariable_type_table_length,
2895 localvariable_type_table_start,
2896 CHECK_NULL);
2897 }
2898
2899 if (parsed_annotations.has_any_annotations())
2900 parsed_annotations.apply_to(m);
2901
2902 // Copy annotations
2903 copy_method_annotations(m->constMethod(),
2904 runtime_visible_annotations,
2905 runtime_visible_annotations_length,
2906 runtime_invisible_annotations,
2907 runtime_invisible_annotations_length,
2908 runtime_visible_parameter_annotations,
2909 runtime_visible_parameter_annotations_length,
2910 runtime_invisible_parameter_annotations,
2911 runtime_invisible_parameter_annotations_length,
2912 runtime_visible_type_annotations,
2913 runtime_visible_type_annotations_length,
2914 runtime_invisible_type_annotations,
2915 runtime_invisible_type_annotations_length,
2916 annotation_default,
2917 annotation_default_length,
2918 CHECK_NULL);
2919
2920 if (name == vmSymbols::finalize_method_name() &&
2921 signature == vmSymbols::void_method_signature()) {
2922 if (m->is_empty_method()) {
2923 _has_empty_finalizer = true;
2924 } else {
2925 _has_finalizer = true;
2926 }
2927 }
2928 if (name == vmSymbols::object_initializer_name() &&
2929 signature == vmSymbols::void_method_signature() &&
2930 m->is_vanilla_constructor()) {
2931 _has_vanilla_constructor = true;
2932 }
2933
2934 NOT_PRODUCT(m->verify());
2935 return m;
2936 }
2937
2938
2939 // The promoted_flags parameter is used to pass relevant access_flags
2940 // from the methods back up to the containing klass. These flag values
2941 // are added to klass's access_flags.
2942 // Side-effects: populates the _methods field in the parser
2943 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2944 bool is_interface,
2945 AccessFlags* promoted_flags,
2946 bool* has_final_method,
2947 bool* declares_nonstatic_concrete_methods,
2948 TRAPS) {
2949 assert(cfs != NULL, "invariant");
2950 assert(promoted_flags != NULL, "invariant");
2951 assert(has_final_method != NULL, "invariant");
2952 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2953
2954 assert(NULL == _methods, "invariant");
2955
2956 cfs->guarantee_more(2, CHECK); // length
2957 const u2 length = cfs->get_u2_fast();
2958 if (length == 0) {
2959 _methods = Universe::the_empty_method_array();
2960 } else {
2961 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2962 length,
2963 NULL,
2964 CHECK);
2965
2966 for (int index = 0; index < length; index++) {
2967 Method* method = parse_method(cfs,
2968 is_interface,
2969 _cp,
2970 promoted_flags,
2971 CHECK);
2972
2973 if (method->is_final()) {
2974 *has_final_method = true;
2975 }
2976 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2977 // used for interface initialization, and default method inheritance analysis
2978 if (is_interface && !(*declares_nonstatic_concrete_methods)
2979 && !method->is_abstract() && !method->is_static()) {
2980 *declares_nonstatic_concrete_methods = true;
2981 }
2982 _methods->at_put(index, method);
2983 }
2984
2985 if (_need_verify && length > 1) {
2986 // Check duplicated methods
2987 ResourceMark rm(THREAD);
2988 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2989 THREAD, NameSigHash*, HASH_ROW_SIZE);
2990 initialize_hashtable(names_and_sigs);
2991 bool dup = false;
2992 const Symbol* name = NULL;
2993 const Symbol* sig = NULL;
2994 {
2995 debug_only(NoSafepointVerifier nsv;)
2996 for (int i = 0; i < length; i++) {
2997 const Method* const m = _methods->at(i);
2998 name = m->name();
2999 sig = m->signature();
3000 // If no duplicates, add name/signature in hashtable names_and_sigs.
3001 if (!put_after_lookup(name, sig, names_and_sigs)) {
3002 dup = true;
3003 break;
3004 }
3005 }
3006 }
3007 if (dup) {
3008 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
3009 name->as_C_string(), sig->as_klass_external_name(), CHECK);
3010 }
3011 }
3012 }
3013 }
3014
3015 static const intArray* sort_methods(Array<Method*>* methods) {
3016 const int length = methods->length();
3017 // If JVMTI original method ordering or sharing is enabled we have to
3018 // remember the original class file ordering.
3019 // We temporarily use the vtable_index field in the Method* to store the
3020 // class file index, so we can read in after calling qsort.
3021 // Put the method ordering in the shared archive.
3022 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3023 for (int index = 0; index < length; index++) {
3024 Method* const m = methods->at(index);
3025 assert(!m->valid_vtable_index(), "vtable index should not be set");
3026 m->set_vtable_index(index);
3027 }
3028 }
3029 // Sort method array by ascending method name (for faster lookups & vtable construction)
3030 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3031 Method::sort_methods(methods);
3032
3033 intArray* method_ordering = NULL;
3034 // If JVMTI original method ordering or sharing is enabled construct int
3035 // array remembering the original ordering
3036 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3037 method_ordering = new intArray(length, length, -1);
3038 for (int index = 0; index < length; index++) {
3039 Method* const m = methods->at(index);
3040 const int old_index = m->vtable_index();
3041 assert(old_index >= 0 && old_index < length, "invalid method index");
3042 method_ordering->at_put(index, old_index);
3043 m->set_vtable_index(Method::invalid_vtable_index);
3044 }
3045 }
3046 return method_ordering;
3047 }
3048
3049 // Parse generic_signature attribute for methods and fields
3050 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3051 TRAPS) {
3052 assert(cfs != NULL, "invariant");
3053
3054 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3055 const u2 generic_signature_index = cfs->get_u2_fast();
3056 check_property(
3057 valid_symbol_at(generic_signature_index),
3058 "Invalid Signature attribute at constant pool index %u in class file %s",
3059 generic_signature_index, CHECK_0);
3060 return generic_signature_index;
3061 }
3062
3063 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3064 TRAPS) {
3065
3066 assert(cfs != NULL, "invariant");
3067
3068 cfs->guarantee_more(2, CHECK); // sourcefile_index
3069 const u2 sourcefile_index = cfs->get_u2_fast();
3070 check_property(
3071 valid_symbol_at(sourcefile_index),
3072 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3073 sourcefile_index, CHECK);
3074 set_class_sourcefile_index(sourcefile_index);
3075 }
3076
3077 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3078 int length,
3079 TRAPS) {
3080 assert(cfs != NULL, "invariant");
3081
3082 const u1* const sde_buffer = cfs->current();
3083 assert(sde_buffer != NULL, "null sde buffer");
3084
3085 // Don't bother storing it if there is no way to retrieve it
3086 if (JvmtiExport::can_get_source_debug_extension()) {
3087 assert((length+1) > length, "Overflow checking");
3088 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3089 for (int i = 0; i < length; i++) {
3090 sde[i] = sde_buffer[i];
3091 }
3092 sde[length] = '\0';
3093 set_class_sde_buffer((const char*)sde, length);
3094 }
3095 // Got utf8 string, set stream position forward
3096 cfs->skip_u1(length, CHECK);
3097 }
3098
3099
3100 // Inner classes can be static, private or protected (classic VM does this)
3101 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3102 JVM_ACC_PRIVATE | \
3103 JVM_ACC_PROTECTED | \
3104 JVM_ACC_STATIC \
3105 )
3106
3107 // Return number of classes in the inner classes attribute table
3108 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3109 const u1* const inner_classes_attribute_start,
3110 bool parsed_enclosingmethod_attribute,
3111 u2 enclosing_method_class_index,
3112 u2 enclosing_method_method_index,
3113 TRAPS) {
3114 const u1* const current_mark = cfs->current();
3115 u2 length = 0;
3116 if (inner_classes_attribute_start != NULL) {
3117 cfs->set_current(inner_classes_attribute_start);
3118 cfs->guarantee_more(2, CHECK_0); // length
3119 length = cfs->get_u2_fast();
3120 }
3121
3122 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3123 // method data:
3124 // [inner_class_info_index,
3125 // outer_class_info_index,
3126 // inner_name_index,
3127 // inner_class_access_flags,
3128 // ...
3129 // enclosing_method_class_index,
3130 // enclosing_method_method_index]
3131 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3132 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3133 _inner_classes = inner_classes;
3134
3135 int index = 0;
3136 const int cp_size = _cp->length();
3137 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3138 for (int n = 0; n < length; n++) {
3139 // Inner class index
3140 const u2 inner_class_info_index = cfs->get_u2_fast();
3141 check_property(
3142 valid_klass_reference_at(inner_class_info_index),
3143 "inner_class_info_index %u has bad constant type in class file %s",
3144 inner_class_info_index, CHECK_0);
3145 // Outer class index
3146 const u2 outer_class_info_index = cfs->get_u2_fast();
3147 check_property(
3148 outer_class_info_index == 0 ||
3149 valid_klass_reference_at(outer_class_info_index),
3150 "outer_class_info_index %u has bad constant type in class file %s",
3151 outer_class_info_index, CHECK_0);
3152 // Inner class name
3153 const u2 inner_name_index = cfs->get_u2_fast();
3154 check_property(
3155 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3156 "inner_name_index %u has bad constant type in class file %s",
3157 inner_name_index, CHECK_0);
3158 if (_need_verify) {
3159 guarantee_property(inner_class_info_index != outer_class_info_index,
3160 "Class is both outer and inner class in class file %s", CHECK_0);
3161 }
3162 // Access flags
3163 jint flags;
3164 // JVM_ACC_MODULE is defined in JDK-9 and later.
3165 if (_major_version >= JAVA_9_VERSION) {
3166 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3167 } else {
3168 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3169 }
3170 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3171 // Set abstract bit for old class files for backward compatibility
3172 flags |= JVM_ACC_ABSTRACT;
3173 }
3174 verify_legal_class_modifiers(flags, CHECK_0);
3175 AccessFlags inner_access_flags(flags);
3176
3177 inner_classes->at_put(index++, inner_class_info_index);
3178 inner_classes->at_put(index++, outer_class_info_index);
3179 inner_classes->at_put(index++, inner_name_index);
3180 inner_classes->at_put(index++, inner_access_flags.as_short());
3181 }
3182
3183 // 4347400: make sure there's no duplicate entry in the classes array
3184 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3185 for(int i = 0; i < length * 4; i += 4) {
3186 for(int j = i + 4; j < length * 4; j += 4) {
3187 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3188 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3189 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3190 inner_classes->at(i+3) != inner_classes->at(j+3)),
3191 "Duplicate entry in InnerClasses in class file %s",
3192 CHECK_0);
3193 }
3194 }
3195 }
3196
3197 // Set EnclosingMethod class and method indexes.
3198 if (parsed_enclosingmethod_attribute) {
3199 inner_classes->at_put(index++, enclosing_method_class_index);
3200 inner_classes->at_put(index++, enclosing_method_method_index);
3201 }
3202 assert(index == size, "wrong size");
3203
3204 // Restore buffer's current position.
3205 cfs->set_current(current_mark);
3206
3207 return length;
3208 }
3209
3210 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3211 set_class_synthetic_flag(true);
3212 }
3213
3214 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3215 assert(cfs != NULL, "invariant");
3216
3217 const u2 signature_index = cfs->get_u2(CHECK);
3218 check_property(
3219 valid_symbol_at(signature_index),
3220 "Invalid constant pool index %u in Signature attribute in class file %s",
3221 signature_index, CHECK);
3222 set_class_generic_signature_index(signature_index);
3223 }
3224
3225 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3226 ConstantPool* cp,
3227 u4 attribute_byte_length,
3228 TRAPS) {
3229 assert(cfs != NULL, "invariant");
3230 assert(cp != NULL, "invariant");
3231
3232 const u1* const current_start = cfs->current();
3233
3234 guarantee_property(attribute_byte_length >= sizeof(u2),
3235 "Invalid BootstrapMethods attribute length %u in class file %s",
3236 attribute_byte_length,
3237 CHECK);
3238
3239 cfs->guarantee_more(attribute_byte_length, CHECK);
3240
3241 const int attribute_array_length = cfs->get_u2_fast();
3242
3243 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3244 "Short length on BootstrapMethods in class file %s",
3245 CHECK);
3246
3247
3248 // The attribute contains a counted array of counted tuples of shorts,
3249 // represending bootstrap specifiers:
3250 // length*{bootstrap_method_index, argument_count*{argument_index}}
3251 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3252 // operand_count = number of shorts in attr, except for leading length
3253
3254 // The attribute is copied into a short[] array.
3255 // The array begins with a series of short[2] pairs, one for each tuple.
3256 const int index_size = (attribute_array_length * 2);
3257
3258 Array<u2>* const operands =
3259 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3260
3261 // Eagerly assign operands so they will be deallocated with the constant
3262 // pool if there is an error.
3263 cp->set_operands(operands);
3264
3265 int operand_fill_index = index_size;
3266 const int cp_size = cp->length();
3267
3268 for (int n = 0; n < attribute_array_length; n++) {
3269 // Store a 32-bit offset into the header of the operand array.
3270 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3271
3272 // Read a bootstrap specifier.
3273 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3274 const u2 bootstrap_method_index = cfs->get_u2_fast();
3275 const u2 argument_count = cfs->get_u2_fast();
3276 check_property(
3277 valid_cp_range(bootstrap_method_index, cp_size) &&
3278 cp->tag_at(bootstrap_method_index).is_method_handle(),
3279 "bootstrap_method_index %u has bad constant type in class file %s",
3280 bootstrap_method_index,
3281 CHECK);
3282
3283 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3284 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3285 CHECK);
3286
3287 operands->at_put(operand_fill_index++, bootstrap_method_index);
3288 operands->at_put(operand_fill_index++, argument_count);
3289
3290 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3291 for (int j = 0; j < argument_count; j++) {
3292 const u2 argument_index = cfs->get_u2_fast();
3293 check_property(
3294 valid_cp_range(argument_index, cp_size) &&
3295 cp->tag_at(argument_index).is_loadable_constant(),
3296 "argument_index %u has bad constant type in class file %s",
3297 argument_index,
3298 CHECK);
3299 operands->at_put(operand_fill_index++, argument_index);
3300 }
3301 }
3302 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3303 "Bad length on BootstrapMethods in class file %s",
3304 CHECK);
3305 }
3306
3307 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3308 ConstantPool* cp,
3309 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3310 TRAPS) {
3311 assert(cfs != NULL, "invariant");
3312 assert(cp != NULL, "invariant");
3313 assert(parsed_annotations != NULL, "invariant");
3314
3315 // Set inner classes attribute to default sentinel
3316 _inner_classes = Universe::the_empty_short_array();
3317 cfs->guarantee_more(2, CHECK); // attributes_count
3318 u2 attributes_count = cfs->get_u2_fast();
3319 bool parsed_sourcefile_attribute = false;
3320 bool parsed_innerclasses_attribute = false;
3321 bool parsed_enclosingmethod_attribute = false;
3322 bool parsed_bootstrap_methods_attribute = false;
3323 const u1* runtime_visible_annotations = NULL;
3324 int runtime_visible_annotations_length = 0;
3325 const u1* runtime_invisible_annotations = NULL;
3326 int runtime_invisible_annotations_length = 0;
3327 const u1* runtime_visible_type_annotations = NULL;
3328 int runtime_visible_type_annotations_length = 0;
3329 const u1* runtime_invisible_type_annotations = NULL;
3330 int runtime_invisible_type_annotations_length = 0;
3331 bool runtime_invisible_type_annotations_exists = false;
3332 bool runtime_invisible_annotations_exists = false;
3333 bool parsed_source_debug_ext_annotations_exist = false;
3334 const u1* inner_classes_attribute_start = NULL;
3335 u4 inner_classes_attribute_length = 0;
3336 u2 enclosing_method_class_index = 0;
3337 u2 enclosing_method_method_index = 0;
3338 // Iterate over attributes
3339 while (attributes_count--) {
3340 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3341 const u2 attribute_name_index = cfs->get_u2_fast();
3342 const u4 attribute_length = cfs->get_u4_fast();
3343 check_property(
3344 valid_symbol_at(attribute_name_index),
3345 "Attribute name has bad constant pool index %u in class file %s",
3346 attribute_name_index, CHECK);
3347 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3348 if (tag == vmSymbols::tag_source_file()) {
3349 // Check for SourceFile tag
3350 if (_need_verify) {
3351 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3352 }
3353 if (parsed_sourcefile_attribute) {
3354 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3355 } else {
3356 parsed_sourcefile_attribute = true;
3357 }
3358 parse_classfile_sourcefile_attribute(cfs, CHECK);
3359 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3360 // Check for SourceDebugExtension tag
3361 if (parsed_source_debug_ext_annotations_exist) {
3362 classfile_parse_error(
3363 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3364 }
3365 parsed_source_debug_ext_annotations_exist = true;
3366 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3367 } else if (tag == vmSymbols::tag_inner_classes()) {
3368 // Check for InnerClasses tag
3369 if (parsed_innerclasses_attribute) {
3370 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3371 } else {
3372 parsed_innerclasses_attribute = true;
3373 }
3374 inner_classes_attribute_start = cfs->current();
3375 inner_classes_attribute_length = attribute_length;
3376 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3377 } else if (tag == vmSymbols::tag_synthetic()) {
3378 // Check for Synthetic tag
3379 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3380 if (attribute_length != 0) {
3381 classfile_parse_error(
3382 "Invalid Synthetic classfile attribute length %u in class file %s",
3383 attribute_length, CHECK);
3384 }
3385 parse_classfile_synthetic_attribute(CHECK);
3386 } else if (tag == vmSymbols::tag_deprecated()) {
3387 // Check for Deprecatd tag - 4276120
3388 if (attribute_length != 0) {
3389 classfile_parse_error(
3390 "Invalid Deprecated classfile attribute length %u in class file %s",
3391 attribute_length, CHECK);
3392 }
3393 } else if (_major_version >= JAVA_1_5_VERSION) {
3394 if (tag == vmSymbols::tag_signature()) {
3395 if (_generic_signature_index != 0) {
3396 classfile_parse_error(
3397 "Multiple Signature attributes in class file %s", CHECK);
3398 }
3399 if (attribute_length != 2) {
3400 classfile_parse_error(
3401 "Wrong Signature attribute length %u in class file %s",
3402 attribute_length, CHECK);
3403 }
3404 parse_classfile_signature_attribute(cfs, CHECK);
3405 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3406 if (runtime_visible_annotations != NULL) {
3407 classfile_parse_error(
3408 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3409 }
3410 runtime_visible_annotations_length = attribute_length;
3411 runtime_visible_annotations = cfs->current();
3412 assert(runtime_visible_annotations != NULL, "null visible annotations");
3413 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3414 parse_annotations(cp,
3415 runtime_visible_annotations,
3416 runtime_visible_annotations_length,
3417 parsed_annotations,
3418 _loader_data,
3419 CHECK);
3420 cfs->skip_u1_fast(runtime_visible_annotations_length);
3421 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3422 if (runtime_invisible_annotations_exists) {
3423 classfile_parse_error(
3424 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3425 }
3426 runtime_invisible_annotations_exists = true;
3427 if (PreserveAllAnnotations) {
3428 runtime_invisible_annotations_length = attribute_length;
3429 runtime_invisible_annotations = cfs->current();
3430 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3431 }
3432 cfs->skip_u1(attribute_length, CHECK);
3433 } else if (tag == vmSymbols::tag_enclosing_method()) {
3434 if (parsed_enclosingmethod_attribute) {
3435 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3436 } else {
3437 parsed_enclosingmethod_attribute = true;
3438 }
3439 guarantee_property(attribute_length == 4,
3440 "Wrong EnclosingMethod attribute length %u in class file %s",
3441 attribute_length, CHECK);
3442 cfs->guarantee_more(4, CHECK); // class_index, method_index
3443 enclosing_method_class_index = cfs->get_u2_fast();
3444 enclosing_method_method_index = cfs->get_u2_fast();
3445 if (enclosing_method_class_index == 0) {
3446 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3447 }
3448 // Validate the constant pool indices and types
3449 check_property(valid_klass_reference_at(enclosing_method_class_index),
3450 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3451 if (enclosing_method_method_index != 0 &&
3452 (!cp->is_within_bounds(enclosing_method_method_index) ||
3453 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3454 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3455 }
3456 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3457 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3458 if (parsed_bootstrap_methods_attribute) {
3459 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3460 }
3461 parsed_bootstrap_methods_attribute = true;
3462 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3463 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3464 if (runtime_visible_type_annotations != NULL) {
3465 classfile_parse_error(
3466 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3467 }
3468 runtime_visible_type_annotations_length = attribute_length;
3469 runtime_visible_type_annotations = cfs->current();
3470 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3471 // No need for the VM to parse Type annotations
3472 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3473 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3474 if (runtime_invisible_type_annotations_exists) {
3475 classfile_parse_error(
3476 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3477 } else {
3478 runtime_invisible_type_annotations_exists = true;
3479 }
3480 if (PreserveAllAnnotations) {
3481 runtime_invisible_type_annotations_length = attribute_length;
3482 runtime_invisible_type_annotations = cfs->current();
3483 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3484 }
3485 cfs->skip_u1(attribute_length, CHECK);
3486 } else {
3487 // Unknown attribute
3488 cfs->skip_u1(attribute_length, CHECK);
3489 }
3490 } else {
3491 // Unknown attribute
3492 cfs->skip_u1(attribute_length, CHECK);
3493 }
3494 }
3495 _annotations = assemble_annotations(runtime_visible_annotations,
3496 runtime_visible_annotations_length,
3497 runtime_invisible_annotations,
3498 runtime_invisible_annotations_length,
3499 CHECK);
3500 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3501 runtime_visible_type_annotations_length,
3502 runtime_invisible_type_annotations,
3503 runtime_invisible_type_annotations_length,
3504 CHECK);
3505
3506 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3507 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3508 cfs,
3509 inner_classes_attribute_start,
3510 parsed_innerclasses_attribute,
3511 enclosing_method_class_index,
3512 enclosing_method_method_index,
3513 CHECK);
3514 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3515 guarantee_property(
3516 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3517 "Wrong InnerClasses attribute length in class file %s", CHECK);
3518 }
3519 }
3520
3521 if (_max_bootstrap_specifier_index >= 0) {
3522 guarantee_property(parsed_bootstrap_methods_attribute,
3523 "Missing BootstrapMethods attribute in class file %s", CHECK);
3524 }
3525 }
3526
3527 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3528 assert(k != NULL, "invariant");
3529
3530 if (_synthetic_flag)
3531 k->set_is_synthetic();
3532 if (_sourcefile_index != 0) {
3533 k->set_source_file_name_index(_sourcefile_index);
3534 }
3535 if (_generic_signature_index != 0) {
3536 k->set_generic_signature_index(_generic_signature_index);
3537 }
3538 if (_sde_buffer != NULL) {
3539 k->set_source_debug_extension(_sde_buffer, _sde_length);
3540 }
3541 }
3542
3543 // Create the Annotations object that will
3544 // hold the annotations array for the Klass.
3545 void ClassFileParser::create_combined_annotations(TRAPS) {
3546 if (_annotations == NULL &&
3547 _type_annotations == NULL &&
3548 _fields_annotations == NULL &&
3549 _fields_type_annotations == NULL) {
3550 // Don't create the Annotations object unnecessarily.
3551 return;
3552 }
3553
3554 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3555 annotations->set_class_annotations(_annotations);
3556 annotations->set_class_type_annotations(_type_annotations);
3557 annotations->set_fields_annotations(_fields_annotations);
3558 annotations->set_fields_type_annotations(_fields_type_annotations);
3559
3560 // This is the Annotations object that will be
3561 // assigned to InstanceKlass being constructed.
3562 _combined_annotations = annotations;
3563
3564 // The annotations arrays below has been transfered the
3565 // _combined_annotations so these fields can now be cleared.
3566 _annotations = NULL;
3567 _type_annotations = NULL;
3568 _fields_annotations = NULL;
3569 _fields_type_annotations = NULL;
3570 }
3571
3572 // Transfer ownership of metadata allocated to the InstanceKlass.
3573 void ClassFileParser::apply_parsed_class_metadata(
3574 InstanceKlass* this_klass,
3575 int java_fields_count, TRAPS) {
3576 assert(this_klass != NULL, "invariant");
3577
3578 _cp->set_pool_holder(this_klass);
3579 this_klass->set_constants(_cp);
3580 this_klass->set_fields(_fields, java_fields_count);
3581 this_klass->set_methods(_methods);
3582 this_klass->set_inner_classes(_inner_classes);
3583 this_klass->set_local_interfaces(_local_interfaces);
3584 this_klass->set_transitive_interfaces(_transitive_interfaces);
3585 this_klass->set_annotations(_combined_annotations);
3586
3587 // Clear out these fields so they don't get deallocated by the destructor
3588 clear_class_metadata();
3589 }
3590
3591 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3592 int runtime_visible_annotations_length,
3593 const u1* const runtime_invisible_annotations,
3594 int runtime_invisible_annotations_length,
3595 TRAPS) {
3596 AnnotationArray* annotations = NULL;
3597 if (runtime_visible_annotations != NULL ||
3598 runtime_invisible_annotations != NULL) {
3599 annotations = MetadataFactory::new_array<u1>(_loader_data,
3600 runtime_visible_annotations_length +
3601 runtime_invisible_annotations_length,
3602 CHECK_(annotations));
3603 if (runtime_visible_annotations != NULL) {
3604 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3605 annotations->at_put(i, runtime_visible_annotations[i]);
3606 }
3607 }
3608 if (runtime_invisible_annotations != NULL) {
3609 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3610 int append = runtime_visible_annotations_length+i;
3611 annotations->at_put(append, runtime_invisible_annotations[i]);
3612 }
3613 }
3614 }
3615 return annotations;
3616 }
3617
3618 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3619 const int super_class_index,
3620 const bool need_verify,
3621 TRAPS) {
3622 assert(cp != NULL, "invariant");
3623 const InstanceKlass* super_klass = NULL;
3624
3625 if (super_class_index == 0) {
3626 check_property(_class_name == vmSymbols::java_lang_Object(),
3627 "Invalid superclass index %u in class file %s",
3628 super_class_index,
3629 CHECK_NULL);
3630 } else {
3631 check_property(valid_klass_reference_at(super_class_index),
3632 "Invalid superclass index %u in class file %s",
3633 super_class_index,
3634 CHECK_NULL);
3635 // The class name should be legal because it is checked when parsing constant pool.
3636 // However, make sure it is not an array type.
3637 bool is_array = false;
3638 if (cp->tag_at(super_class_index).is_klass()) {
3639 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3640 if (need_verify)
3641 is_array = super_klass->is_array_klass();
3642 } else if (need_verify) {
3643 is_array = (cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3644 }
3645 if (need_verify) {
3646 guarantee_property(!is_array,
3647 "Bad superclass name in class file %s", CHECK_NULL);
3648 }
3649 }
3650 return super_klass;
3651 }
3652
3653 static unsigned int compute_oop_map_count(const InstanceKlass* super,
3654 unsigned int nonstatic_oop_map_count,
3655 int first_nonstatic_oop_offset) {
3656
3657 unsigned int map_count =
3658 NULL == super ? 0 : super->nonstatic_oop_map_count();
3659 if (nonstatic_oop_map_count > 0) {
3660 // We have oops to add to map
3661 if (map_count == 0) {
3662 map_count = nonstatic_oop_map_count;
3663 }
3664 else {
3665 // Check whether we should add a new map block or whether the last one can
3666 // be extended
3667 const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3668 const OopMapBlock* const last_map = first_map + map_count - 1;
3669
3670 const int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3671 if (next_offset == first_nonstatic_oop_offset) {
3672 // There is no gap bettwen superklass's last oop field and first
3673 // local oop field, merge maps.
3674 nonstatic_oop_map_count -= 1;
3675 }
3676 else {
3677 // Superklass didn't end with a oop field, add extra maps
3678 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3679 }
3680 map_count += nonstatic_oop_map_count;
3681 }
3682 }
3683 return map_count;
3684 }
3685
3686 #ifndef PRODUCT
3687 static void print_field_layout(const Symbol* name,
3688 Array<u2>* fields,
3689 const constantPoolHandle& cp,
3690 int instance_size,
3691 int instance_fields_start,
3692 int instance_fields_end,
3693 int static_fields_end) {
3694
3695 assert(name != NULL, "invariant");
3696
3697 tty->print("%s: field layout\n", name->as_klass_external_name());
3698 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3699 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3700 if (!fs.access_flags().is_static()) {
3701 tty->print(" @%3d \"%s\" %s\n",
3702 fs.offset(),
3703 fs.name()->as_klass_external_name(),
3704 fs.signature()->as_klass_external_name());
3705 }
3706 }
3707 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3708 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3709 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3710 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3711 if (fs.access_flags().is_static()) {
3712 tty->print(" @%3d \"%s\" %s\n",
3713 fs.offset(),
3714 fs.name()->as_klass_external_name(),
3715 fs.signature()->as_klass_external_name());
3716 }
3717 }
3718 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3719 tty->print("\n");
3720 }
3721 #endif
3722
3723 // Values needed for oopmap and InstanceKlass creation
3724 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3725 public:
3726 int* nonstatic_oop_offsets;
3727 unsigned int* nonstatic_oop_counts;
3728 unsigned int nonstatic_oop_map_count;
3729 unsigned int total_oop_map_count;
3730 int instance_size;
3731 int nonstatic_field_size;
3732 int static_field_size;
3733 bool has_nonstatic_fields;
3734 };
3735
3736 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3737 void ClassFileParser::layout_fields(ConstantPool* cp,
3738 const FieldAllocationCount* fac,
3739 const ClassAnnotationCollector* parsed_annotations,
3740 FieldLayoutInfo* info,
3741 TRAPS) {
3742
3743 assert(cp != NULL, "invariant");
3744
3745 // Field size and offset computation
3746 int nonstatic_field_size = _super_klass == NULL ? 0 :
3747 _super_klass->nonstatic_field_size();
3748
3749 // Count the contended fields by type.
3750 //
3751 // We ignore static fields, because @Contended is not supported for them.
3752 // The layout code below will also ignore the static fields.
3753 int nonstatic_contended_count = 0;
3754 FieldAllocationCount fac_contended;
3755 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3756 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3757 if (fs.is_contended()) {
3758 fac_contended.count[atype]++;
3759 if (!fs.access_flags().is_static()) {
3760 nonstatic_contended_count++;
3761 }
3762 }
3763 }
3764
3765
3766 // Calculate the starting byte offsets
3767 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3768 int next_static_double_offset = next_static_oop_offset +
3769 ((fac->count[STATIC_OOP]) * heapOopSize);
3770 if ( fac->count[STATIC_DOUBLE] &&
3771 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3772 Universe::field_type_should_be_aligned(T_LONG)) ) {
3773 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
3774 }
3775
3776 int next_static_word_offset = next_static_double_offset +
3777 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3778 int next_static_short_offset = next_static_word_offset +
3779 ((fac->count[STATIC_WORD]) * BytesPerInt);
3780 int next_static_byte_offset = next_static_short_offset +
3781 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3782
3783 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3784 nonstatic_field_size * heapOopSize;
3785
3786 int next_nonstatic_field_offset = nonstatic_fields_start;
3787
3788 const bool is_contended_class = parsed_annotations->is_contended();
3789
3790 // Class is contended, pad before all the fields
3791 if (is_contended_class) {
3792 next_nonstatic_field_offset += ContendedPaddingWidth;
3793 }
3794
3795 // Compute the non-contended fields count.
3796 // The packing code below relies on these counts to determine if some field
3797 // can be squeezed into the alignment gap. Contended fields are obviously
3798 // exempt from that.
3799 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3800 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3801 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3802 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3803 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3804
3805 // Total non-static fields count, including every contended field
3806 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3807 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3808 fac->count[NONSTATIC_OOP];
3809
3810 const bool super_has_nonstatic_fields =
3811 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
3812 const bool has_nonstatic_fields =
3813 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3814
3815
3816 // Prepare list of oops for oop map generation.
3817 //
3818 // "offset" and "count" lists are describing the set of contiguous oop
3819 // regions. offset[i] is the start of the i-th region, which then has
3820 // count[i] oops following. Before we know how many regions are required,
3821 // we pessimistically allocate the maps to fit all the oops into the
3822 // distinct regions.
3823 //
3824 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3825 // to figure out if we still need to do this.
3826 unsigned int nonstatic_oop_map_count = 0;
3827 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3828
3829 int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3830 THREAD, int, max_nonstatic_oop_maps);
3831 unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3832 THREAD, unsigned int, max_nonstatic_oop_maps);
3833
3834 int first_nonstatic_oop_offset = 0; // will be set for first oop field
3835
3836 bool compact_fields = CompactFields;
3837 int allocation_style = FieldsAllocationStyle;
3838 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3839 assert(false, "0 <= FieldsAllocationStyle <= 2");
3840 allocation_style = 1; // Optimistic
3841 }
3842
3843 // The next classes have predefined hard-coded fields offsets
3844 // (see in JavaClasses::compute_hard_coded_offsets()).
3845 // Use default fields allocation order for them.
3846 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
3847 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3848 _class_name == vmSymbols::java_lang_Class() ||
3849 _class_name == vmSymbols::java_lang_ClassLoader() ||
3850 _class_name == vmSymbols::java_lang_ref_Reference() ||
3851 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3852 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3853 _class_name == vmSymbols::java_lang_String() ||
3854 _class_name == vmSymbols::java_lang_Throwable() ||
3855 _class_name == vmSymbols::java_lang_Boolean() ||
3856 _class_name == vmSymbols::java_lang_Character() ||
3857 _class_name == vmSymbols::java_lang_Float() ||
3858 _class_name == vmSymbols::java_lang_Double() ||
3859 _class_name == vmSymbols::java_lang_Byte() ||
3860 _class_name == vmSymbols::java_lang_Short() ||
3861 _class_name == vmSymbols::java_lang_Integer() ||
3862 _class_name == vmSymbols::java_lang_Long())) {
3863 allocation_style = 0; // Allocate oops first
3864 compact_fields = false; // Don't compact fields
3865 }
3866
3867 int next_nonstatic_oop_offset = 0;
3868 int next_nonstatic_double_offset = 0;
3869
3870 // Rearrange fields for a given allocation style
3871 if( allocation_style == 0 ) {
3872 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3873 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3874 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3875 (nonstatic_oop_count * heapOopSize);
3876 } else if( allocation_style == 1 ) {
3877 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3878 next_nonstatic_double_offset = next_nonstatic_field_offset;
3879 } else if( allocation_style == 2 ) {
3880 // Fields allocation: oops fields in super and sub classes are together.
3881 if( nonstatic_field_size > 0 && _super_klass != NULL &&
3882 _super_klass->nonstatic_oop_map_size() > 0 ) {
3883 const unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3884 const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps();
3885 const OopMapBlock* const last_map = first_map + map_count - 1;
3886 const int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3887 if (next_offset == next_nonstatic_field_offset) {
3888 allocation_style = 0; // allocate oops first
3889 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3890 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3891 (nonstatic_oop_count * heapOopSize);
3892 }
3893 }
3894 if( allocation_style == 2 ) {
3895 allocation_style = 1; // allocate oops last
3896 next_nonstatic_double_offset = next_nonstatic_field_offset;
3897 }
3898 } else {
3899 ShouldNotReachHere();
3900 }
3901
3902 int nonstatic_oop_space_count = 0;
3903 int nonstatic_word_space_count = 0;
3904 int nonstatic_short_space_count = 0;
3905 int nonstatic_byte_space_count = 0;
3906 int nonstatic_oop_space_offset = 0;
3907 int nonstatic_word_space_offset = 0;
3908 int nonstatic_short_space_offset = 0;
3909 int nonstatic_byte_space_offset = 0;
3910
3911 // Try to squeeze some of the fields into the gaps due to
3912 // long/double alignment.
3913 if (nonstatic_double_count > 0) {
3914 int offset = next_nonstatic_double_offset;
3915 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
3916 if (compact_fields && offset != next_nonstatic_double_offset) {
3917 // Allocate available fields into the gap before double field.
3918 int length = next_nonstatic_double_offset - offset;
3919 assert(length == BytesPerInt, "");
3920 nonstatic_word_space_offset = offset;
3921 if (nonstatic_word_count > 0) {
3922 nonstatic_word_count -= 1;
3923 nonstatic_word_space_count = 1; // Only one will fit
3924 length -= BytesPerInt;
3925 offset += BytesPerInt;
3926 }
3927 nonstatic_short_space_offset = offset;
3928 while (length >= BytesPerShort && nonstatic_short_count > 0) {
3929 nonstatic_short_count -= 1;
3930 nonstatic_short_space_count += 1;
3931 length -= BytesPerShort;
3932 offset += BytesPerShort;
3933 }
3934 nonstatic_byte_space_offset = offset;
3935 while (length > 0 && nonstatic_byte_count > 0) {
3936 nonstatic_byte_count -= 1;
3937 nonstatic_byte_space_count += 1;
3938 length -= 1;
3939 }
3940 // Allocate oop field in the gap if there are no other fields for that.
3941 nonstatic_oop_space_offset = offset;
3942 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
3943 allocation_style != 0) { // when oop fields not first
3944 nonstatic_oop_count -= 1;
3945 nonstatic_oop_space_count = 1; // Only one will fit
3946 length -= heapOopSize;
3947 offset += heapOopSize;
3948 }
3949 }
3950 }
3951
3952 int next_nonstatic_word_offset = next_nonstatic_double_offset +
3953 (nonstatic_double_count * BytesPerLong);
3954 int next_nonstatic_short_offset = next_nonstatic_word_offset +
3955 (nonstatic_word_count * BytesPerInt);
3956 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
3957 (nonstatic_short_count * BytesPerShort);
3958 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3959 nonstatic_byte_count;
3960
3961 // let oops jump before padding with this allocation style
3962 if( allocation_style == 1 ) {
3963 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3964 if( nonstatic_oop_count > 0 ) {
3965 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
3966 }
3967 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3968 }
3969
3970 // Iterate over fields again and compute correct offsets.
3971 // The field allocation type was temporarily stored in the offset slot.
3972 // oop fields are located before non-oop fields (static and non-static).
3973 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3974
3975 // skip already laid out fields
3976 if (fs.is_offset_set()) continue;
3977
3978 // contended instance fields are handled below
3979 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3980
3981 int real_offset = 0;
3982 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
3983
3984 // pack the rest of the fields
3985 switch (atype) {
3986 case STATIC_OOP:
3987 real_offset = next_static_oop_offset;
3988 next_static_oop_offset += heapOopSize;
3989 break;
3990 case STATIC_BYTE:
3991 real_offset = next_static_byte_offset;
3992 next_static_byte_offset += 1;
3993 break;
3994 case STATIC_SHORT:
3995 real_offset = next_static_short_offset;
3996 next_static_short_offset += BytesPerShort;
3997 break;
3998 case STATIC_WORD:
3999 real_offset = next_static_word_offset;
4000 next_static_word_offset += BytesPerInt;
4001 break;
4002 case STATIC_DOUBLE:
4003 real_offset = next_static_double_offset;
4004 next_static_double_offset += BytesPerLong;
4005 break;
4006 case NONSTATIC_OOP:
4007 if( nonstatic_oop_space_count > 0 ) {
4008 real_offset = nonstatic_oop_space_offset;
4009 nonstatic_oop_space_offset += heapOopSize;
4010 nonstatic_oop_space_count -= 1;
4011 } else {
4012 real_offset = next_nonstatic_oop_offset;
4013 next_nonstatic_oop_offset += heapOopSize;
4014 }
4015
4016 // Record this oop in the oop maps
4017 if( nonstatic_oop_map_count > 0 &&
4018 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4019 real_offset -
4020 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4021 heapOopSize ) {
4022 // This oop is adjacent to the previous one, add to current oop map
4023 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4024 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4025 } else {
4026 // This oop is not adjacent to the previous one, create new oop map
4027 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4028 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4029 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4030 nonstatic_oop_map_count += 1;
4031 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4032 first_nonstatic_oop_offset = real_offset;
4033 }
4034 }
4035 break;
4036 case NONSTATIC_BYTE:
4037 if( nonstatic_byte_space_count > 0 ) {
4038 real_offset = nonstatic_byte_space_offset;
4039 nonstatic_byte_space_offset += 1;
4040 nonstatic_byte_space_count -= 1;
4041 } else {
4042 real_offset = next_nonstatic_byte_offset;
4043 next_nonstatic_byte_offset += 1;
4044 }
4045 break;
4046 case NONSTATIC_SHORT:
4047 if( nonstatic_short_space_count > 0 ) {
4048 real_offset = nonstatic_short_space_offset;
4049 nonstatic_short_space_offset += BytesPerShort;
4050 nonstatic_short_space_count -= 1;
4051 } else {
4052 real_offset = next_nonstatic_short_offset;
4053 next_nonstatic_short_offset += BytesPerShort;
4054 }
4055 break;
4056 case NONSTATIC_WORD:
4057 if( nonstatic_word_space_count > 0 ) {
4058 real_offset = nonstatic_word_space_offset;
4059 nonstatic_word_space_offset += BytesPerInt;
4060 nonstatic_word_space_count -= 1;
4061 } else {
4062 real_offset = next_nonstatic_word_offset;
4063 next_nonstatic_word_offset += BytesPerInt;
4064 }
4065 break;
4066 case NONSTATIC_DOUBLE:
4067 real_offset = next_nonstatic_double_offset;
4068 next_nonstatic_double_offset += BytesPerLong;
4069 break;
4070 default:
4071 ShouldNotReachHere();
4072 }
4073 fs.set_offset(real_offset);
4074 }
4075
4076
4077 // Handle the contended cases.
4078 //
4079 // Each contended field should not intersect the cache line with another contended field.
4080 // In the absence of alignment information, we end up with pessimistically separating
4081 // the fields with full-width padding.
4082 //
4083 // Additionally, this should not break alignment for the fields, so we round the alignment up
4084 // for each field.
4085 if (nonstatic_contended_count > 0) {
4086
4087 // if there is at least one contended field, we need to have pre-padding for them
4088 next_nonstatic_padded_offset += ContendedPaddingWidth;
4089
4090 // collect all contended groups
4091 ResourceBitMap bm(cp->size());
4092 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4093 // skip already laid out fields
4094 if (fs.is_offset_set()) continue;
4095
4096 if (fs.is_contended()) {
4097 bm.set_bit(fs.contended_group());
4098 }
4099 }
4100
4101 int current_group = -1;
4102 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4103
4104 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4105
4106 // skip already laid out fields
4107 if (fs.is_offset_set()) continue;
4108
4109 // skip non-contended fields and fields from different group
4110 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4111
4112 // handle statics below
4113 if (fs.access_flags().is_static()) continue;
4114
4115 int real_offset = 0;
4116 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4117
4118 switch (atype) {
4119 case NONSTATIC_BYTE:
4120 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4121 real_offset = next_nonstatic_padded_offset;
4122 next_nonstatic_padded_offset += 1;
4123 break;
4124
4125 case NONSTATIC_SHORT:
4126 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4127 real_offset = next_nonstatic_padded_offset;
4128 next_nonstatic_padded_offset += BytesPerShort;
4129 break;
4130
4131 case NONSTATIC_WORD:
4132 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4133 real_offset = next_nonstatic_padded_offset;
4134 next_nonstatic_padded_offset += BytesPerInt;
4135 break;
4136
4137 case NONSTATIC_DOUBLE:
4138 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4139 real_offset = next_nonstatic_padded_offset;
4140 next_nonstatic_padded_offset += BytesPerLong;
4141 break;
4142
4143 case NONSTATIC_OOP:
4144 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4145 real_offset = next_nonstatic_padded_offset;
4146 next_nonstatic_padded_offset += heapOopSize;
4147
4148 // Record this oop in the oop maps
4149 if( nonstatic_oop_map_count > 0 &&
4150 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4151 real_offset -
4152 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4153 heapOopSize ) {
4154 // This oop is adjacent to the previous one, add to current oop map
4155 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4156 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4157 } else {
4158 // This oop is not adjacent to the previous one, create new oop map
4159 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4160 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4161 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4162 nonstatic_oop_map_count += 1;
4163 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4164 first_nonstatic_oop_offset = real_offset;
4165 }
4166 }
4167 break;
4168
4169 default:
4170 ShouldNotReachHere();
4171 }
4172
4173 if (fs.contended_group() == 0) {
4174 // Contended group defines the equivalence class over the fields:
4175 // the fields within the same contended group are not inter-padded.
4176 // The only exception is default group, which does not incur the
4177 // equivalence, and so requires intra-padding.
4178 next_nonstatic_padded_offset += ContendedPaddingWidth;
4179 }
4180
4181 fs.set_offset(real_offset);
4182 } // for
4183
4184 // Start laying out the next group.
4185 // Note that this will effectively pad the last group in the back;
4186 // this is expected to alleviate memory contention effects for
4187 // subclass fields and/or adjacent object.
4188 // If this was the default group, the padding is already in place.
4189 if (current_group != 0) {
4190 next_nonstatic_padded_offset += ContendedPaddingWidth;
4191 }
4192 }
4193
4194 // handle static fields
4195 }
4196
4197 // Entire class is contended, pad in the back.
4198 // This helps to alleviate memory contention effects for subclass fields
4199 // and/or adjacent object.
4200 if (is_contended_class) {
4201 next_nonstatic_padded_offset += ContendedPaddingWidth;
4202 }
4203
4204 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4205
4206 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize);
4207 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4208 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4209
4210 int static_field_size = (static_fields_end -
4211 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4212 nonstatic_field_size = nonstatic_field_size +
4213 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4214
4215 int instance_size = align_object_size(instance_end / wordSize);
4216
4217 assert(instance_size == align_object_size(align_up(
4218 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
4219 wordSize) / wordSize), "consistent layout helper value");
4220
4221 // Invariant: nonstatic_field end/start should only change if there are
4222 // nonstatic fields in the class, or if the class is contended. We compare
4223 // against the non-aligned value, so that end alignment will not fail the
4224 // assert without actually having the fields.
4225 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4226 is_contended_class ||
4227 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4228
4229 // Number of non-static oop map blocks allocated at end of klass.
4230 const unsigned int total_oop_map_count =
4231 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
4232 first_nonstatic_oop_offset);
4233
4234 #ifndef PRODUCT
4235 if (PrintFieldLayout) {
4236 print_field_layout(_class_name,
4237 _fields,
4238 cp,
4239 instance_size,
4240 nonstatic_fields_start,
4241 nonstatic_fields_end,
4242 static_fields_end);
4243 }
4244
4245 #endif
4246 // Pass back information needed for InstanceKlass creation
4247 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
4248 info->nonstatic_oop_counts = nonstatic_oop_counts;
4249 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
4250 info->total_oop_map_count = total_oop_map_count;
4251 info->instance_size = instance_size;
4252 info->static_field_size = static_field_size;
4253 info->nonstatic_field_size = nonstatic_field_size;
4254 info->has_nonstatic_fields = has_nonstatic_fields;
4255 }
4256
4257 static void fill_oop_maps(const InstanceKlass* k,
4258 unsigned int nonstatic_oop_map_count,
4259 const int* nonstatic_oop_offsets,
4260 const unsigned int* nonstatic_oop_counts) {
4261
4262 assert(k != NULL, "invariant");
4263
4264 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4265 const InstanceKlass* const super = k->superklass();
4266 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4267 if (super_count > 0) {
4268 // Copy maps from superklass
4269 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4270 for (unsigned int i = 0; i < super_count; ++i) {
4271 *this_oop_map++ = *super_oop_map++;
4272 }
4273 }
4274
4275 if (nonstatic_oop_map_count > 0) {
4276 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4277 // The counts differ because there is no gap between superklass's last oop
4278 // field and the first local oop field. Extend the last oop map copied
4279 // from the superklass instead of creating new one.
4280 nonstatic_oop_map_count--;
4281 nonstatic_oop_offsets++;
4282 this_oop_map--;
4283 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4284 this_oop_map++;
4285 }
4286
4287 // Add new map blocks, fill them
4288 while (nonstatic_oop_map_count-- > 0) {
4289 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4290 this_oop_map->set_count(*nonstatic_oop_counts++);
4291 this_oop_map++;
4292 }
4293 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4294 this_oop_map, "sanity");
4295 }
4296 }
4297
4298
4299 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4300 assert(ik != NULL, "invariant");
4301
4302 const Klass* const super = ik->super();
4303
4304 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4305 // in which case we don't have to register objects as finalizable
4306 if (!_has_empty_finalizer) {
4307 if (_has_finalizer ||
4308 (super != NULL && super->has_finalizer())) {
4309 ik->set_has_finalizer();
4310 }
4311 }
4312
4313 #ifdef ASSERT
4314 bool f = false;
4315 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4316 vmSymbols::void_method_signature());
4317 if (m != NULL && !m->is_empty_method()) {
4318 f = true;
4319 }
4320
4321 // Spec doesn't prevent agent from redefinition of empty finalizer.
4322 // Despite the fact that it's generally bad idea and redefined finalizer
4323 // will not work as expected we shouldn't abort vm in this case
4324 if (!ik->has_redefined_this_or_super()) {
4325 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4326 }
4327 #endif
4328
4329 // Check if this klass supports the java.lang.Cloneable interface
4330 if (SystemDictionary::Cloneable_klass_loaded()) {
4331 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4332 ik->set_is_cloneable();
4333 }
4334 }
4335
4336 // Check if this klass has a vanilla default constructor
4337 if (super == NULL) {
4338 // java.lang.Object has empty default constructor
4339 ik->set_has_vanilla_constructor();
4340 } else {
4341 if (super->has_vanilla_constructor() &&
4342 _has_vanilla_constructor) {
4343 ik->set_has_vanilla_constructor();
4344 }
4345 #ifdef ASSERT
4346 bool v = false;
4347 if (super->has_vanilla_constructor()) {
4348 const Method* const constructor =
4349 ik->find_method(vmSymbols::object_initializer_name(),
4350 vmSymbols::void_method_signature());
4351 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4352 v = true;
4353 }
4354 }
4355 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4356 #endif
4357 }
4358
4359 // If it cannot be fast-path allocated, set a bit in the layout helper.
4360 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4361 assert(ik->size_helper() > 0, "layout_helper is initialized");
4362 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4363 || ik->is_abstract() || ik->is_interface()
4364 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4365 || ik->size_helper() >= FastAllocateSizeLimit) {
4366 // Forbid fast-path allocation.
4367 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4368 ik->set_layout_helper(lh);
4369 }
4370 }
4371
4372 // Attach super classes and interface classes to class loader data
4373 static void record_defined_class_dependencies(const InstanceKlass* defined_klass,
4374 TRAPS) {
4375 assert(defined_klass != NULL, "invariant");
4376
4377 ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data();
4378 if (defining_loader_data->is_the_null_class_loader_data()) {
4379 // Dependencies to null class loader data are implicit.
4380 return;
4381 } else {
4382 // add super class dependency
4383 Klass* const super = defined_klass->super();
4384 if (super != NULL) {
4385 defining_loader_data->record_dependency(super, CHECK);
4386 }
4387
4388 // add super interface dependencies
4389 const Array<Klass*>* const local_interfaces = defined_klass->local_interfaces();
4390 if (local_interfaces != NULL) {
4391 const int length = local_interfaces->length();
4392 for (int i = 0; i < length; i++) {
4393 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4394 }
4395 }
4396 }
4397 }
4398
4399 // utility methods for appending an array with check for duplicates
4400
4401 static void append_interfaces(GrowableArray<Klass*>* result,
4402 const Array<Klass*>* const ifs) {
4403 // iterate over new interfaces
4404 for (int i = 0; i < ifs->length(); i++) {
4405 Klass* const e = ifs->at(i);
4406 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4407 // add new interface
4408 result->append_if_missing(e);
4409 }
4410 }
4411
4412 static Array<Klass*>* compute_transitive_interfaces(const InstanceKlass* super,
4413 Array<Klass*>* local_ifs,
4414 ClassLoaderData* loader_data,
4415 TRAPS) {
4416 assert(local_ifs != NULL, "invariant");
4417 assert(loader_data != NULL, "invariant");
4418
4419 // Compute maximum size for transitive interfaces
4420 int max_transitive_size = 0;
4421 int super_size = 0;
4422 // Add superclass transitive interfaces size
4423 if (super != NULL) {
4424 super_size = super->transitive_interfaces()->length();
4425 max_transitive_size += super_size;
4426 }
4427 // Add local interfaces' super interfaces
4428 const int local_size = local_ifs->length();
4429 for (int i = 0; i < local_size; i++) {
4430 Klass* const l = local_ifs->at(i);
4431 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4432 }
4433 // Finally add local interfaces
4434 max_transitive_size += local_size;
4435 // Construct array
4436 if (max_transitive_size == 0) {
4437 // no interfaces, use canonicalized array
4438 return Universe::the_empty_klass_array();
4439 } else if (max_transitive_size == super_size) {
4440 // no new local interfaces added, share superklass' transitive interface array
4441 return super->transitive_interfaces();
4442 } else if (max_transitive_size == local_size) {
4443 // only local interfaces added, share local interface array
4444 return local_ifs;
4445 } else {
4446 ResourceMark rm;
4447 GrowableArray<Klass*>* const result = new GrowableArray<Klass*>(max_transitive_size);
4448
4449 // Copy down from superclass
4450 if (super != NULL) {
4451 append_interfaces(result, super->transitive_interfaces());
4452 }
4453
4454 // Copy down from local interfaces' superinterfaces
4455 for (int i = 0; i < local_size; i++) {
4456 Klass* const l = local_ifs->at(i);
4457 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4458 }
4459 // Finally add local interfaces
4460 append_interfaces(result, local_ifs);
4461
4462 // length will be less than the max_transitive_size if duplicates were removed
4463 const int length = result->length();
4464 assert(length <= max_transitive_size, "just checking");
4465 Array<Klass*>* const new_result =
4466 MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL);
4467 for (int i = 0; i < length; i++) {
4468 Klass* const e = result->at(i);
4469 assert(e != NULL, "just checking");
4470 new_result->at_put(i, e);
4471 }
4472 return new_result;
4473 }
4474 }
4475
4476 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4477 assert(this_klass != NULL, "invariant");
4478 const Klass* const super = this_klass->super();
4479 if (super != NULL) {
4480
4481 // If the loader is not the boot loader then throw an exception if its
4482 // superclass is in package jdk.internal.reflect and its loader is not a
4483 // special reflection class loader
4484 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4485 assert(super->is_instance_klass(), "super is not instance klass");
4486 PackageEntry* super_package = super->package();
4487 if (super_package != NULL &&
4488 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4489 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4490 ResourceMark rm(THREAD);
4491 Exceptions::fthrow(
4492 THREAD_AND_LOCATION,
4493 vmSymbols::java_lang_IllegalAccessError(),
4494 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4495 this_klass->external_name(),
4496 this_klass->class_loader_data()->loader_name(),
4497 super->external_name());
4498 return;
4499 }
4500 }
4501
4502 Reflection::VerifyClassAccessResults vca_result =
4503 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4504 if (vca_result != Reflection::ACCESS_OK) {
4505 ResourceMark rm(THREAD);
4506 char* msg = Reflection::verify_class_access_msg(this_klass,
4507 InstanceKlass::cast(super),
4508 vca_result);
4509 if (msg == NULL) {
4510 Exceptions::fthrow(
4511 THREAD_AND_LOCATION,
4512 vmSymbols::java_lang_IllegalAccessError(),
4513 "class %s cannot access its superclass %s",
4514 this_klass->external_name(),
4515 super->external_name());
4516 } else {
4517 // Add additional message content.
4518 Exceptions::fthrow(
4519 THREAD_AND_LOCATION,
4520 vmSymbols::java_lang_IllegalAccessError(),
4521 "superclass access check failed: %s",
4522 msg);
4523 }
4524 }
4525 }
4526 }
4527
4528
4529 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4530 assert(this_klass != NULL, "invariant");
4531 const Array<Klass*>* const local_interfaces = this_klass->local_interfaces();
4532 const int lng = local_interfaces->length();
4533 for (int i = lng - 1; i >= 0; i--) {
4534 Klass* const k = local_interfaces->at(i);
4535 assert (k != NULL && k->is_interface(), "invalid interface");
4536 Reflection::VerifyClassAccessResults vca_result =
4537 Reflection::verify_class_access(this_klass, InstanceKlass::cast(k), false);
4538 if (vca_result != Reflection::ACCESS_OK) {
4539 ResourceMark rm(THREAD);
4540 char* msg = Reflection::verify_class_access_msg(this_klass,
4541 InstanceKlass::cast(k),
4542 vca_result);
4543 if (msg == NULL) {
4544 Exceptions::fthrow(
4545 THREAD_AND_LOCATION,
4546 vmSymbols::java_lang_IllegalAccessError(),
4547 "class %s cannot access its superinterface %s",
4548 this_klass->external_name(),
4549 k->external_name());
4550 } else {
4551 // Add additional message content.
4552 Exceptions::fthrow(
4553 THREAD_AND_LOCATION,
4554 vmSymbols::java_lang_IllegalAccessError(),
4555 "superinterface check failed: %s",
4556 msg);
4557 }
4558 }
4559 }
4560 }
4561
4562
4563 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4564 assert(this_klass != NULL, "invariant");
4565 const Array<Method*>* const methods = this_klass->methods();
4566 const int num_methods = methods->length();
4567
4568 // go thru each method and check if it overrides a final method
4569 for (int index = 0; index < num_methods; index++) {
4570 const Method* const m = methods->at(index);
4571
4572 // skip private, static, and <init> methods
4573 if ((!m->is_private() && !m->is_static()) &&
4574 (m->name() != vmSymbols::object_initializer_name())) {
4575
4576 const Symbol* const name = m->name();
4577 const Symbol* const signature = m->signature();
4578 const Klass* k = this_klass->super();
4579 const Method* super_m = NULL;
4580 while (k != NULL) {
4581 // skip supers that don't have final methods.
4582 if (k->has_final_method()) {
4583 // lookup a matching method in the super class hierarchy
4584 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4585 if (super_m == NULL) {
4586 break; // didn't find any match; get out
4587 }
4588
4589 if (super_m->is_final() && !super_m->is_static() &&
4590 // matching method in super is final, and not static
4591 (Reflection::verify_field_access(this_klass,
4592 super_m->method_holder(),
4593 super_m->method_holder(),
4594 super_m->access_flags(), false))
4595 // this class can access super final method and therefore override
4596 ) {
4597 ResourceMark rm(THREAD);
4598 Exceptions::fthrow(
4599 THREAD_AND_LOCATION,
4600 vmSymbols::java_lang_VerifyError(),
4601 "class %s overrides final method %s.%s%s",
4602 this_klass->external_name(),
4603 super_m->method_holder()->external_name(),
4604 name->as_C_string(),
4605 signature->as_C_string()
4606 );
4607 return;
4608 }
4609
4610 // continue to look from super_m's holder's super.
4611 k = super_m->method_holder()->super();
4612 continue;
4613 }
4614
4615 k = k->super();
4616 }
4617 }
4618 }
4619 }
4620
4621
4622 // assumes that this_klass is an interface
4623 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4624 assert(this_klass != NULL, "invariant");
4625 assert(this_klass->is_interface(), "not an interface");
4626 const Array<Method*>* methods = this_klass->methods();
4627 const int num_methods = methods->length();
4628
4629 for (int index = 0; index < num_methods; index++) {
4630 const Method* const m = methods->at(index);
4631 // if m is static and not the init method, throw a verify error
4632 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4633 ResourceMark rm(THREAD);
4634 Exceptions::fthrow(
4635 THREAD_AND_LOCATION,
4636 vmSymbols::java_lang_VerifyError(),
4637 "Illegal static method %s in interface %s",
4638 m->name()->as_C_string(),
4639 this_klass->external_name()
4640 );
4641 return;
4642 }
4643 }
4644 }
4645
4646 // utility methods for format checking
4647
4648 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4649 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4650 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4651 if (is_module) {
4652 ResourceMark rm(THREAD);
4653 Exceptions::fthrow(
4654 THREAD_AND_LOCATION,
4655 vmSymbols::java_lang_NoClassDefFoundError(),
4656 "%s is not a class because access_flag ACC_MODULE is set",
4657 _class_name->as_C_string());
4658 return;
4659 }
4660
4661 if (!_need_verify) { return; }
4662
4663 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4664 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4665 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4666 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4667 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4668 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4669 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4670
4671 if ((is_abstract && is_final) ||
4672 (is_interface && !is_abstract) ||
4673 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4674 (!is_interface && major_gte_15 && is_annotation)) {
4675 ResourceMark rm(THREAD);
4676 Exceptions::fthrow(
4677 THREAD_AND_LOCATION,
4678 vmSymbols::java_lang_ClassFormatError(),
4679 "Illegal class modifiers in class %s: 0x%X",
4680 _class_name->as_C_string(), flags
4681 );
4682 return;
4683 }
4684 }
4685
4686 static bool has_illegal_visibility(jint flags) {
4687 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4688 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4689 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4690
4691 return ((is_public && is_protected) ||
4692 (is_public && is_private) ||
4693 (is_protected && is_private));
4694 }
4695
4696 static bool is_supported_version(u2 major, u2 minor){
4697 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4698 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4699 (major <= max_version) &&
4700 ((major != max_version) ||
4701 (minor <= JVM_CLASSFILE_MINOR_VERSION));
4702 }
4703
4704 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4705 bool is_interface,
4706 TRAPS) const {
4707 if (!_need_verify) { return; }
4708
4709 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4710 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4711 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4712 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4713 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4714 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4715 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4716 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4717 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4718
4719 bool is_illegal = false;
4720
4721 if (is_interface) {
4722 if (!is_public || !is_static || !is_final || is_private ||
4723 is_protected || is_volatile || is_transient ||
4724 (major_gte_15 && is_enum)) {
4725 is_illegal = true;
4726 }
4727 } else { // not interface
4728 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4729 is_illegal = true;
4730 }
4731 }
4732
4733 if (is_illegal) {
4734 ResourceMark rm(THREAD);
4735 Exceptions::fthrow(
4736 THREAD_AND_LOCATION,
4737 vmSymbols::java_lang_ClassFormatError(),
4738 "Illegal field modifiers in class %s: 0x%X",
4739 _class_name->as_C_string(), flags);
4740 return;
4741 }
4742 }
4743
4744 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4745 bool is_interface,
4746 const Symbol* name,
4747 TRAPS) const {
4748 if (!_need_verify) { return; }
4749
4750 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4751 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4752 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4753 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4754 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4755 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4756 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4757 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4758 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4759 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4760 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4761 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4762 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4763
4764 bool is_illegal = false;
4765
4766 if (is_interface) {
4767 if (major_gte_8) {
4768 // Class file version is JAVA_8_VERSION or later Methods of
4769 // interfaces may set any of the flags except ACC_PROTECTED,
4770 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4771 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4772 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4773 (is_native || is_protected || is_final || is_synchronized) ||
4774 // If a specific method of a class or interface has its
4775 // ACC_ABSTRACT flag set, it must not have any of its
4776 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4777 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4778 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4779 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4780 (is_abstract && (is_private || is_static || is_strict))) {
4781 is_illegal = true;
4782 }
4783 } else if (major_gte_15) {
4784 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4785 if (!is_public || is_private || is_protected || is_static || is_final ||
4786 is_synchronized || is_native || !is_abstract || is_strict) {
4787 is_illegal = true;
4788 }
4789 } else {
4790 // Class file version is pre-JAVA_1_5_VERSION
4791 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4792 is_illegal = true;
4793 }
4794 }
4795 } else { // not interface
4796 if (has_illegal_visibility(flags)) {
4797 is_illegal = true;
4798 } else {
4799 if (is_initializer) {
4800 if (is_static || is_final || is_synchronized || is_native ||
4801 is_abstract || (major_gte_15 && is_bridge)) {
4802 is_illegal = true;
4803 }
4804 } else { // not initializer
4805 if (is_abstract) {
4806 if ((is_final || is_native || is_private || is_static ||
4807 (major_gte_15 && (is_synchronized || is_strict)))) {
4808 is_illegal = true;
4809 }
4810 }
4811 }
4812 }
4813 }
4814
4815 if (is_illegal) {
4816 ResourceMark rm(THREAD);
4817 Exceptions::fthrow(
4818 THREAD_AND_LOCATION,
4819 vmSymbols::java_lang_ClassFormatError(),
4820 "Method %s in class %s has illegal modifiers: 0x%X",
4821 name->as_C_string(), _class_name->as_C_string(), flags);
4822 return;
4823 }
4824 }
4825
4826 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4827 int length,
4828 TRAPS) const {
4829 assert(_need_verify, "only called when _need_verify is true");
4830 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
4831 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4832 }
4833 }
4834
4835 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4836 // In class names, '/' separates unqualified names. This is verified in this function also.
4837 // Method names also may not contain the characters '<' or '>', unless <init>
4838 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4839 // method. Because these names have been checked as special cases before
4840 // calling this method in verify_legal_method_name.
4841 //
4842 // This method is also called from the modular system APIs in modules.cpp
4843 // to verify the validity of module and package names.
4844 bool ClassFileParser::verify_unqualified_name(const char* name,
4845 unsigned int length,
4846 int type) {
4847 for (const char* p = name; p != name + length;) {
4848 jchar ch = *p;
4849 if (ch < 128) {
4850 if (ch == '.' || ch == ';' || ch == '[' ) {
4851 return false; // do not permit '.', ';', or '['
4852 }
4853 if (ch == '/') {
4854 // check for '//' or leading or trailing '/' which are not legal
4855 // unqualified name must not be empty
4856 if (type == ClassFileParser::LegalClass) {
4857 if (p == name || p+1 >= name+length || *(p+1) == '/') {
4858 return false;
4859 }
4860 } else {
4861 return false; // do not permit '/' unless it's class name
4862 }
4863 }
4864 if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) {
4865 return false; // do not permit '<' or '>' in method names
4866 }
4867 p++;
4868 } else {
4869 char* tmp_p = UTF8::next(p, &ch);
4870 p = tmp_p;
4871 }
4872 }
4873 return true;
4874 }
4875
4876 // Take pointer to a string. Skip over the longest part of the string that could
4877 // be taken as a fieldname. Allow '/' if slash_ok is true.
4878 // Return a pointer to just past the fieldname.
4879 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4880 // being true, we saw consecutive slashes (meaning we were looking for a
4881 // qualified path but found something that was badly-formed).
4882 static const char* skip_over_field_name(const char* name,
4883 bool slash_ok,
4884 unsigned int length) {
4885 const char* p;
4886 jboolean last_is_slash = false;
4887 jboolean not_first_ch = false;
4888
4889 for (p = name; p != name + length; not_first_ch = true) {
4890 const char* old_p = p;
4891 jchar ch = *p;
4892 if (ch < 128) {
4893 p++;
4894 // quick check for ascii
4895 if ((ch >= 'a' && ch <= 'z') ||
4896 (ch >= 'A' && ch <= 'Z') ||
4897 (ch == '_' || ch == '$') ||
4898 (not_first_ch && ch >= '0' && ch <= '9')) {
4899 last_is_slash = false;
4900 continue;
4901 }
4902 if (slash_ok && ch == '/') {
4903 if (last_is_slash) {
4904 return NULL; // Don't permit consecutive slashes
4905 }
4906 last_is_slash = true;
4907 continue;
4908 }
4909 }
4910 else {
4911 jint unicode_ch;
4912 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4913 p = tmp_p;
4914 last_is_slash = false;
4915 // Check if ch is Java identifier start or is Java identifier part
4916 // 4672820: call java.lang.Character methods directly without generating separate tables.
4917 EXCEPTION_MARK;
4918
4919 // return value
4920 JavaValue result(T_BOOLEAN);
4921 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4922 JavaCallArguments args;
4923 args.push_int(unicode_ch);
4924
4925 // public static boolean isJavaIdentifierStart(char ch);
4926 JavaCalls::call_static(&result,
4927 SystemDictionary::Character_klass(),
4928 vmSymbols::isJavaIdentifierStart_name(),
4929 vmSymbols::int_bool_signature(),
4930 &args,
4931 THREAD);
4932
4933 if (HAS_PENDING_EXCEPTION) {
4934 CLEAR_PENDING_EXCEPTION;
4935 return 0;
4936 }
4937 if (result.get_jboolean()) {
4938 continue;
4939 }
4940
4941 if (not_first_ch) {
4942 // public static boolean isJavaIdentifierPart(char ch);
4943 JavaCalls::call_static(&result,
4944 SystemDictionary::Character_klass(),
4945 vmSymbols::isJavaIdentifierPart_name(),
4946 vmSymbols::int_bool_signature(),
4947 &args,
4948 THREAD);
4949
4950 if (HAS_PENDING_EXCEPTION) {
4951 CLEAR_PENDING_EXCEPTION;
4952 return 0;
4953 }
4954
4955 if (result.get_jboolean()) {
4956 continue;
4957 }
4958 }
4959 }
4960 return (not_first_ch) ? old_p : NULL;
4961 }
4962 return (not_first_ch) ? p : NULL;
4963 }
4964
4965 // Take pointer to a string. Skip over the longest part of the string that could
4966 // be taken as a field signature. Allow "void" if void_ok.
4967 // Return a pointer to just past the signature.
4968 // Return NULL if no legal signature is found.
4969 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4970 bool void_ok,
4971 unsigned int length,
4972 TRAPS) const {
4973 unsigned int array_dim = 0;
4974 while (length > 0) {
4975 switch (signature[0]) {
4976 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4977 case JVM_SIGNATURE_BOOLEAN:
4978 case JVM_SIGNATURE_BYTE:
4979 case JVM_SIGNATURE_CHAR:
4980 case JVM_SIGNATURE_SHORT:
4981 case JVM_SIGNATURE_INT:
4982 case JVM_SIGNATURE_FLOAT:
4983 case JVM_SIGNATURE_LONG:
4984 case JVM_SIGNATURE_DOUBLE:
4985 return signature + 1;
4986 case JVM_SIGNATURE_CLASS: {
4987 if (_major_version < JAVA_1_5_VERSION) {
4988 // Skip over the class name if one is there
4989 const char* const p = skip_over_field_name(signature + 1, true, --length);
4990
4991 // The next character better be a semicolon
4992 if (p && (p - signature) > 1 && p[0] == ';') {
4993 return p + 1;
4994 }
4995 }
4996 else {
4997 // Skip leading 'L' and ignore first appearance of ';'
4998 length--;
4999 signature++;
5000 char* c = strchr((char*) signature, ';');
5001 // Format check signature
5002 if (c != NULL) {
5003 ResourceMark rm(THREAD);
5004 int newlen = c - (char*) signature;
5005 char* sig = NEW_RESOURCE_ARRAY(char, newlen + 1);
5006 strncpy(sig, signature, newlen);
5007 sig[newlen] = '\0';
5008
5009 bool legal = verify_unqualified_name(sig, newlen, LegalClass);
5010 if (!legal) {
5011 classfile_parse_error("Class name contains illegal character "
5012 "in descriptor in class file %s",
5013 CHECK_0);
5014 return NULL;
5015 }
5016 return signature + newlen + 1;
5017 }
5018 }
5019 return NULL;
5020 }
5021 case JVM_SIGNATURE_ARRAY:
5022 array_dim++;
5023 if (array_dim > 255) {
5024 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5025 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5026 }
5027 // The rest of what's there better be a legal signature
5028 signature++;
5029 length--;
5030 void_ok = false;
5031 break;
5032 default:
5033 return NULL;
5034 }
5035 }
5036 return NULL;
5037 }
5038
5039 // Checks if name is a legal class name.
5040 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5041 if (!_need_verify || _relax_verify) { return; }
5042
5043 char buf[fixed_buffer_size];
5044 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5045 unsigned int length = name->utf8_length();
5046 bool legal = false;
5047
5048 if (length > 0) {
5049 const char* p;
5050 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5051 p = skip_over_field_signature(bytes, false, length, CHECK);
5052 legal = (p != NULL) && ((p - bytes) == (int)length);
5053 } else if (_major_version < JAVA_1_5_VERSION) {
5054 if (bytes[0] != '<') {
5055 p = skip_over_field_name(bytes, true, length);
5056 legal = (p != NULL) && ((p - bytes) == (int)length);
5057 }
5058 } else {
5059 // 4900761: relax the constraints based on JSR202 spec
5060 // Class names may be drawn from the entire Unicode character set.
5061 // Identifiers between '/' must be unqualified names.
5062 // The utf8 string has been verified when parsing cpool entries.
5063 legal = verify_unqualified_name(bytes, length, LegalClass);
5064 }
5065 }
5066 if (!legal) {
5067 ResourceMark rm(THREAD);
5068 assert(_class_name != NULL, "invariant");
5069 Exceptions::fthrow(
5070 THREAD_AND_LOCATION,
5071 vmSymbols::java_lang_ClassFormatError(),
5072 "Illegal class name \"%s\" in class file %s", bytes,
5073 _class_name->as_C_string()
5074 );
5075 return;
5076 }
5077 }
5078
5079 // Checks if name is a legal field name.
5080 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5081 if (!_need_verify || _relax_verify) { return; }
5082
5083 char buf[fixed_buffer_size];
5084 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5085 unsigned int length = name->utf8_length();
5086 bool legal = false;
5087
5088 if (length > 0) {
5089 if (_major_version < JAVA_1_5_VERSION) {
5090 if (bytes[0] != '<') {
5091 const char* p = skip_over_field_name(bytes, false, length);
5092 legal = (p != NULL) && ((p - bytes) == (int)length);
5093 }
5094 } else {
5095 // 4881221: relax the constraints based on JSR202 spec
5096 legal = verify_unqualified_name(bytes, length, LegalField);
5097 }
5098 }
5099
5100 if (!legal) {
5101 ResourceMark rm(THREAD);
5102 assert(_class_name != NULL, "invariant");
5103 Exceptions::fthrow(
5104 THREAD_AND_LOCATION,
5105 vmSymbols::java_lang_ClassFormatError(),
5106 "Illegal field name \"%s\" in class %s", bytes,
5107 _class_name->as_C_string()
5108 );
5109 return;
5110 }
5111 }
5112
5113 // Checks if name is a legal method name.
5114 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5115 if (!_need_verify || _relax_verify) { return; }
5116
5117 assert(name != NULL, "method name is null");
5118 char buf[fixed_buffer_size];
5119 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5120 unsigned int length = name->utf8_length();
5121 bool legal = false;
5122
5123 if (length > 0) {
5124 if (bytes[0] == '<') {
5125 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5126 legal = true;
5127 }
5128 } else if (_major_version < JAVA_1_5_VERSION) {
5129 const char* p;
5130 p = skip_over_field_name(bytes, false, length);
5131 legal = (p != NULL) && ((p - bytes) == (int)length);
5132 } else {
5133 // 4881221: relax the constraints based on JSR202 spec
5134 legal = verify_unqualified_name(bytes, length, LegalMethod);
5135 }
5136 }
5137
5138 if (!legal) {
5139 ResourceMark rm(THREAD);
5140 assert(_class_name != NULL, "invariant");
5141 Exceptions::fthrow(
5142 THREAD_AND_LOCATION,
5143 vmSymbols::java_lang_ClassFormatError(),
5144 "Illegal method name \"%s\" in class %s", bytes,
5145 _class_name->as_C_string()
5146 );
5147 return;
5148 }
5149 }
5150
5151
5152 // Checks if signature is a legal field signature.
5153 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5154 const Symbol* signature,
5155 TRAPS) const {
5156 if (!_need_verify) { return; }
5157
5158 char buf[fixed_buffer_size];
5159 const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5160 const unsigned int length = signature->utf8_length();
5161 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5162
5163 if (p == NULL || (p - bytes) != (int)length) {
5164 throwIllegalSignature("Field", name, signature, CHECK);
5165 }
5166 }
5167
5168 // Checks if signature is a legal method signature.
5169 // Returns number of parameters
5170 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5171 const Symbol* signature,
5172 TRAPS) const {
5173 if (!_need_verify) {
5174 // make sure caller's args_size will be less than 0 even for non-static
5175 // method so it will be recomputed in compute_size_of_parameters().
5176 return -2;
5177 }
5178
5179 // Class initializers cannot have args for class format version >= 51.
5180 if (name == vmSymbols::class_initializer_name() &&
5181 signature != vmSymbols::void_method_signature() &&
5182 _major_version >= JAVA_7_VERSION) {
5183 throwIllegalSignature("Method", name, signature, CHECK_0);
5184 return 0;
5185 }
5186
5187 unsigned int args_size = 0;
5188 char buf[fixed_buffer_size];
5189 const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5190 unsigned int length = signature->utf8_length();
5191 const char* nextp;
5192
5193 // The first character must be a '('
5194 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5195 length--;
5196 // Skip over legal field signatures
5197 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5198 while ((length > 0) && (nextp != NULL)) {
5199 args_size++;
5200 if (p[0] == 'J' || p[0] == 'D') {
5201 args_size++;
5202 }
5203 length -= nextp - p;
5204 p = nextp;
5205 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5206 }
5207 // The first non-signature thing better be a ')'
5208 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5209 length--;
5210 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5211 // All internal methods must return void
5212 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5213 return args_size;
5214 }
5215 } else {
5216 // Now we better just have a return value
5217 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5218 if (nextp && ((int)length == (nextp - p))) {
5219 return args_size;
5220 }
5221 }
5222 }
5223 }
5224 // Report error
5225 throwIllegalSignature("Method", name, signature, CHECK_0);
5226 return 0;
5227 }
5228
5229 int ClassFileParser::static_field_size() const {
5230 assert(_field_info != NULL, "invariant");
5231 return _field_info->static_field_size;
5232 }
5233
5234 int ClassFileParser::total_oop_map_count() const {
5235 assert(_field_info != NULL, "invariant");
5236 return _field_info->total_oop_map_count;
5237 }
5238
5239 jint ClassFileParser::layout_size() const {
5240 assert(_field_info != NULL, "invariant");
5241 return _field_info->instance_size;
5242 }
5243
5244 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5245 const Array<Method*>* methods) {
5246 assert(ik != NULL, "invariant");
5247 assert(methods != NULL, "invariant");
5248
5249 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5250 // (We used to do this lazily, but now we query it in Rewriter,
5251 // which is eagerly done for every method, so we might as well do it now,
5252 // when everything is fresh in memory.)
5253 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5254
5255 if (klass_id != vmSymbols::NO_SID) {
5256 for (int j = 0; j < methods->length(); ++j) {
5257 Method* method = methods->at(j);
5258 method->init_intrinsic_id();
5259
5260 if (CheckIntrinsics) {
5261 // Check if an intrinsic is defined for method 'method',
5262 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5263 if (method->intrinsic_id() != vmIntrinsics::_none &&
5264 !method->intrinsic_candidate()) {
5265 tty->print("Compiler intrinsic is defined for method [%s], "
5266 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5267 method->name_and_sig_as_C_string(),
5268 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5269 );
5270 tty->cr();
5271 DEBUG_ONLY(vm_exit(1));
5272 }
5273 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5274 // but there is no intrinsic available for it.
5275 if (method->intrinsic_candidate() &&
5276 method->intrinsic_id() == vmIntrinsics::_none) {
5277 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5278 "but no compiler intrinsic is defined for the method.%s",
5279 method->name_and_sig_as_C_string(),
5280 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5281 );
5282 tty->cr();
5283 DEBUG_ONLY(vm_exit(1));
5284 }
5285 }
5286 } // end for
5287
5288 #ifdef ASSERT
5289 if (CheckIntrinsics) {
5290 // Check for orphan methods in the current class. A method m
5291 // of a class C is orphan if an intrinsic is defined for method m,
5292 // but class C does not declare m.
5293 // The check is potentially expensive, therefore it is available
5294 // only in debug builds.
5295
5296 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5297 if (vmIntrinsics::_compiledLambdaForm == id) {
5298 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5299 // generated for the JVM from a LambdaForm and therefore no method
5300 // is defined for it.
5301 continue;
5302 }
5303
5304 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5305 // Check if the current class contains a method with the same
5306 // name, flags, signature.
5307 bool match = false;
5308 for (int j = 0; j < methods->length(); ++j) {
5309 const Method* method = methods->at(j);
5310 if (method->intrinsic_id() == id) {
5311 match = true;
5312 break;
5313 }
5314 }
5315
5316 if (!match) {
5317 char buf[1000];
5318 tty->print("Compiler intrinsic is defined for method [%s], "
5319 "but the method is not available in class [%s].%s",
5320 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5321 buf, sizeof(buf)),
5322 ik->name()->as_C_string(),
5323 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5324 );
5325 tty->cr();
5326 DEBUG_ONLY(vm_exit(1));
5327 }
5328 }
5329 } // end for
5330 } // CheckIntrinsics
5331 #endif // ASSERT
5332 }
5333 }
5334
5335 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5336 if (_klass != NULL) {
5337 return _klass;
5338 }
5339
5340 InstanceKlass* const ik =
5341 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5342
5343 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5344
5345 assert(_klass == ik, "invariant");
5346
5347 ik->set_has_passed_fingerprint_check(false);
5348 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5349 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5350 if (aot_fp != 0 && aot_fp == _stream->compute_fingerprint()) {
5351 // This class matches with a class saved in an AOT library
5352 ik->set_has_passed_fingerprint_check(true);
5353 } else {
5354 ResourceMark rm;
5355 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5356 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5357 }
5358 }
5359
5360 return ik;
5361 }
5362
5363 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5364 assert(ik != NULL, "invariant");
5365
5366 set_klass_to_deallocate(ik);
5367
5368 assert(_field_info != NULL, "invariant");
5369 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5370 assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count,
5371 "sanity");
5372
5373 assert(ik->is_instance_klass(), "sanity");
5374 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5375
5376 // Fill in information already parsed
5377 ik->set_should_verify_class(_need_verify);
5378
5379 // Not yet: supers are done below to support the new subtype-checking fields
5380 ik->set_class_loader_data(_loader_data);
5381 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5382 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5383 assert(_fac != NULL, "invariant");
5384 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5385
5386 // this transfers ownership of a lot of arrays from
5387 // the parser onto the InstanceKlass*
5388 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5389
5390 // note that is not safe to use the fields in the parser from this point on
5391 assert(NULL == _cp, "invariant");
5392 assert(NULL == _fields, "invariant");
5393 assert(NULL == _methods, "invariant");
5394 assert(NULL == _inner_classes, "invariant");
5395 assert(NULL == _local_interfaces, "invariant");
5396 assert(NULL == _transitive_interfaces, "invariant");
5397 assert(NULL == _combined_annotations, "invariant");
5398
5399 if (_has_final_method) {
5400 ik->set_has_final_method();
5401 }
5402
5403 ik->copy_method_ordering(_method_ordering, CHECK);
5404 // The InstanceKlass::_methods_jmethod_ids cache
5405 // is managed on the assumption that the initial cache
5406 // size is equal to the number of methods in the class. If
5407 // that changes, then InstanceKlass::idnum_can_increment()
5408 // has to be changed accordingly.
5409 ik->set_initial_method_idnum(ik->methods()->length());
5410
5411 ik->set_name(_class_name);
5412
5413 if (is_anonymous()) {
5414 // _this_class_index is a CONSTANT_Class entry that refers to this
5415 // anonymous class itself. If this class needs to refer to its own methods or
5416 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5417 // _this_class_index. However, because this class is anonymous (it's
5418 // not stored in SystemDictionary), _this_class_index cannot be resolved
5419 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5420 // Therefore, we must eagerly resolve _this_class_index now.
5421 ik->constants()->klass_at_put(_this_class_index, ik);
5422 }
5423
5424 ik->set_minor_version(_minor_version);
5425 ik->set_major_version(_major_version);
5426 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5427 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5428
5429 if (_host_klass != NULL) {
5430 assert (ik->is_anonymous(), "should be the same");
5431 ik->set_host_klass(_host_klass);
5432 }
5433
5434 // Set PackageEntry for this_klass
5435 oop cl = ik->class_loader();
5436 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5437 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5438 ik->set_package(cld, CHECK);
5439
5440 const Array<Method*>* const methods = ik->methods();
5441 assert(methods != NULL, "invariant");
5442 const int methods_len = methods->length();
5443
5444 check_methods_for_intrinsics(ik, methods);
5445
5446 // Fill in field values obtained by parse_classfile_attributes
5447 if (_parsed_annotations->has_any_annotations()) {
5448 _parsed_annotations->apply_to(ik);
5449 }
5450
5451 apply_parsed_class_attributes(ik);
5452
5453 // Miranda methods
5454 if ((_num_miranda_methods > 0) ||
5455 // if this class introduced new miranda methods or
5456 (_super_klass != NULL && _super_klass->has_miranda_methods())
5457 // super class exists and this class inherited miranda methods
5458 ) {
5459 ik->set_has_miranda_methods(); // then set a flag
5460 }
5461
5462 // Fill in information needed to compute superclasses.
5463 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), CHECK);
5464
5465 // Initialize itable offset tables
5466 klassItable::setup_itable_offset_table(ik);
5467
5468 // Compute transitive closure of interfaces this class implements
5469 // Do final class setup
5470 fill_oop_maps(ik,
5471 _field_info->nonstatic_oop_map_count,
5472 _field_info->nonstatic_oop_offsets,
5473 _field_info->nonstatic_oop_counts);
5474
5475 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5476 set_precomputed_flags(ik);
5477
5478 // check if this class can access its super class
5479 check_super_class_access(ik, CHECK);
5480
5481 // check if this class can access its superinterfaces
5482 check_super_interface_access(ik, CHECK);
5483
5484 // check if this class overrides any final method
5485 check_final_method_override(ik, CHECK);
5486
5487 // reject static interface methods prior to Java 8
5488 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5489 check_illegal_static_method(ik, CHECK);
5490 }
5491
5492 // Obtain this_klass' module entry
5493 ModuleEntry* module_entry = ik->module();
5494 assert(module_entry != NULL, "module_entry should always be set");
5495
5496 // Obtain java.lang.Module
5497 Handle module_handle(THREAD, module_entry->module());
5498
5499 // Allocate mirror and initialize static fields
5500 // The create_mirror() call will also call compute_modifiers()
5501 java_lang_Class::create_mirror(ik,
5502 Handle(THREAD, _loader_data->class_loader()),
5503 module_handle,
5504 _protection_domain,
5505 CHECK);
5506
5507 assert(_all_mirandas != NULL, "invariant");
5508
5509 // Generate any default methods - default methods are public interface methods
5510 // that have a default implementation. This is new with Java 8.
5511 if (_has_nonstatic_concrete_methods) {
5512 DefaultMethods::generate_default_methods(ik,
5513 _all_mirandas,
5514 CHECK);
5515 }
5516
5517 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5518 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5519 !module_entry->has_default_read_edges()) {
5520 if (!module_entry->set_has_default_read_edges()) {
5521 // We won a potential race
5522 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5523 }
5524 }
5525
5526 // Update the loader_data graph.
5527 record_defined_class_dependencies(ik, CHECK);
5528
5529 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5530
5531 if (!is_internal()) {
5532 if (log_is_enabled(Info, class, load)) {
5533 ResourceMark rm;
5534 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5535 ik->print_class_load_logging(_loader_data, module_name, _stream);
5536 }
5537
5538 if (log_is_enabled(Debug, class, resolve)) {
5539 ResourceMark rm;
5540 // print out the superclass.
5541 const char * from = ik->external_name();
5542 if (ik->java_super() != NULL) {
5543 log_debug(class, resolve)("%s %s (super)",
5544 from,
5545 ik->java_super()->external_name());
5546 }
5547 // print out each of the interface classes referred to by this class.
5548 const Array<Klass*>* const local_interfaces = ik->local_interfaces();
5549 if (local_interfaces != NULL) {
5550 const int length = local_interfaces->length();
5551 for (int i = 0; i < length; i++) {
5552 const Klass* const k = local_interfaces->at(i);
5553 const char * to = k->external_name();
5554 log_debug(class, resolve)("%s %s (interface)", from, to);
5555 }
5556 }
5557 }
5558 }
5559
5560 TRACE_INIT_ID(ik);
5561
5562 // If we reach here, all is well.
5563 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5564 // in order for it to not be destroyed in the ClassFileParser destructor.
5565 set_klass_to_deallocate(NULL);
5566
5567 // it's official
5568 set_klass(ik);
5569
5570 debug_only(ik->verify();)
5571 }
5572
5573 // For an anonymous class that is in the unnamed package, move it to its host class's
5574 // package by prepending its host class's package name to its class name and setting
5575 // its _class_name field.
5576 void ClassFileParser::prepend_host_package_name(const InstanceKlass* host_klass, TRAPS) {
5577 ResourceMark rm(THREAD);
5578 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
5579 "Anonymous class should not be in a package");
5580 const char* host_pkg_name =
5581 ClassLoader::package_from_name(host_klass->name()->as_C_string(), NULL);
5582
5583 if (host_pkg_name != NULL) {
5584 size_t host_pkg_len = strlen(host_pkg_name);
5585 int class_name_len = _class_name->utf8_length();
5586 char* new_anon_name =
5587 NEW_RESOURCE_ARRAY(char, host_pkg_len + 1 + class_name_len);
5588 // Copy host package name and trailing /.
5589 strncpy(new_anon_name, host_pkg_name, host_pkg_len);
5590 new_anon_name[host_pkg_len] = '/';
5591 // Append anonymous class name. The anonymous class name can contain odd
5592 // characters. So, do a strncpy instead of using sprintf("%s...").
5593 strncpy(new_anon_name + host_pkg_len + 1, (char *)_class_name->base(), class_name_len);
5594
5595 // Create a symbol and update the anonymous class name.
5596 _class_name = SymbolTable::new_symbol(new_anon_name,
5597 (int)host_pkg_len + 1 + class_name_len,
5598 CHECK);
5599 }
5600 }
5601
5602 // If the host class and the anonymous class are in the same package then do
5603 // nothing. If the anonymous class is in the unnamed package then move it to its
5604 // host's package. If the classes are in different packages then throw an IAE
5605 // exception.
5606 void ClassFileParser::fix_anonymous_class_name(TRAPS) {
5607 assert(_host_klass != NULL, "Expected an anonymous class");
5608
5609 const jbyte* anon_last_slash = UTF8::strrchr(_class_name->base(),
5610 _class_name->utf8_length(), '/');
5611 if (anon_last_slash == NULL) { // Unnamed package
5612 prepend_host_package_name(_host_klass, CHECK);
5613 } else {
5614 if (!_host_klass->is_same_class_package(_host_klass->class_loader(), _class_name)) {
5615 ResourceMark rm(THREAD);
5616 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
5617 err_msg("Host class %s and anonymous class %s are in different packages",
5618 _host_klass->name()->as_C_string(), _class_name->as_C_string()));
5619 }
5620 }
5621 }
5622
5623 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5624 bool trusted = (loader_data->is_the_null_class_loader_data() ||
5625 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
5626 bool need_verify =
5627 // verifyAll
5628 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5629 // verifyRemote
5630 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5631 return !need_verify;
5632 }
5633
5634 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5635 Symbol* name,
5636 ClassLoaderData* loader_data,
5637 Handle protection_domain,
5638 const InstanceKlass* host_klass,
5639 GrowableArray<Handle>* cp_patches,
5640 Publicity pub_level,
5641 TRAPS) :
5642 _stream(stream),
5643 _requested_name(name),
5644 _loader_data(loader_data),
5645 _host_klass(host_klass),
5646 _cp_patches(cp_patches),
5647 _num_patched_klasses(0),
5648 _max_num_patched_klasses(0),
5649 _orig_cp_size(0),
5650 _first_patched_klass_resolved_index(0),
5651 _super_klass(),
5652 _cp(NULL),
5653 _fields(NULL),
5654 _methods(NULL),
5655 _inner_classes(NULL),
5656 _local_interfaces(NULL),
5657 _transitive_interfaces(NULL),
5658 _combined_annotations(NULL),
5659 _annotations(NULL),
5660 _type_annotations(NULL),
5661 _fields_annotations(NULL),
5662 _fields_type_annotations(NULL),
5663 _klass(NULL),
5664 _klass_to_deallocate(NULL),
5665 _parsed_annotations(NULL),
5666 _fac(NULL),
5667 _field_info(NULL),
5668 _method_ordering(NULL),
5669 _all_mirandas(NULL),
5670 _vtable_size(0),
5671 _itable_size(0),
5672 _num_miranda_methods(0),
5673 _rt(REF_NONE),
5674 _protection_domain(protection_domain),
5675 _access_flags(),
5676 _pub_level(pub_level),
5677 _bad_constant_seen(0),
5678 _synthetic_flag(false),
5679 _sde_length(false),
5680 _sde_buffer(NULL),
5681 _sourcefile_index(0),
5682 _generic_signature_index(0),
5683 _major_version(0),
5684 _minor_version(0),
5685 _this_class_index(0),
5686 _super_class_index(0),
5687 _itfs_len(0),
5688 _java_fields_count(0),
5689 _need_verify(false),
5690 _relax_verify(false),
5691 _has_nonstatic_concrete_methods(false),
5692 _declares_nonstatic_concrete_methods(false),
5693 _has_final_method(false),
5694 _has_finalizer(false),
5695 _has_empty_finalizer(false),
5696 _has_vanilla_constructor(false),
5697 _max_bootstrap_specifier_index(-1) {
5698
5699 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
5700
5701 assert(THREAD->is_Java_thread(), "invariant");
5702 assert(_loader_data != NULL, "invariant");
5703 assert(stream != NULL, "invariant");
5704 assert(_stream != NULL, "invariant");
5705 assert(_stream->buffer() == _stream->current(), "invariant");
5706 assert(_class_name != NULL, "invariant");
5707 assert(0 == _access_flags.as_int(), "invariant");
5708
5709 // Figure out whether we can skip format checking (matching classic VM behavior)
5710 if (DumpSharedSpaces) {
5711 // verify == true means it's a 'remote' class (i.e., non-boot class)
5712 // Verification decision is based on BytecodeVerificationRemote flag
5713 // for those classes.
5714 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
5715 BytecodeVerificationLocal;
5716 }
5717 else {
5718 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
5719 stream->need_verify());
5720 }
5721 if (_cp_patches != NULL) {
5722 int len = _cp_patches->length();
5723 for (int i=0; i<len; i++) {
5724 if (has_cp_patch_at(i)) {
5725 Handle patch = cp_patch_at(i);
5726 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
5727 // We need to append the names of the patched classes to the end of the constant pool,
5728 // because a patched class may have a Utf8 name that's not already included in the
5729 // original constant pool. These class names are used when patch_constant_pool()
5730 // calls patch_class().
5731 //
5732 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
5733 // At this point, we don't know the tag for index i yet, because we haven't parsed the
5734 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
5735 _max_num_patched_klasses++;
5736 }
5737 }
5738 }
5739 }
5740
5741 // synch back verification state to stream
5742 stream->set_verify(_need_verify);
5743
5744 // Check if verification needs to be relaxed for this class file
5745 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
5746 _relax_verify = relax_format_check_for(_loader_data);
5747
5748 parse_stream(stream, CHECK);
5749
5750 post_process_parsed_stream(stream, _cp, CHECK);
5751 }
5752
5753 void ClassFileParser::clear_class_metadata() {
5754 // metadata created before the instance klass is created. Must be
5755 // deallocated if classfile parsing returns an error.
5756 _cp = NULL;
5757 _fields = NULL;
5758 _methods = NULL;
5759 _inner_classes = NULL;
5760 _local_interfaces = NULL;
5761 _transitive_interfaces = NULL;
5762 _combined_annotations = NULL;
5763 _annotations = _type_annotations = NULL;
5764 _fields_annotations = _fields_type_annotations = NULL;
5765 }
5766
5767 // Destructor to clean up
5768 ClassFileParser::~ClassFileParser() {
5769 if (_cp != NULL) {
5770 MetadataFactory::free_metadata(_loader_data, _cp);
5771 }
5772 if (_fields != NULL) {
5773 MetadataFactory::free_array<u2>(_loader_data, _fields);
5774 }
5775
5776 if (_methods != NULL) {
5777 // Free methods
5778 InstanceKlass::deallocate_methods(_loader_data, _methods);
5779 }
5780
5781 // beware of the Universe::empty_blah_array!!
5782 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
5783 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5784 }
5785
5786 // Free interfaces
5787 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5788 _local_interfaces, _transitive_interfaces);
5789
5790 if (_combined_annotations != NULL) {
5791 // After all annotations arrays have been created, they are installed into the
5792 // Annotations object that will be assigned to the InstanceKlass being created.
5793
5794 // Deallocate the Annotations object and the installed annotations arrays.
5795 _combined_annotations->deallocate_contents(_loader_data);
5796
5797 // If the _combined_annotations pointer is non-NULL,
5798 // then the other annotations fields should have been cleared.
5799 assert(_annotations == NULL, "Should have been cleared");
5800 assert(_type_annotations == NULL, "Should have been cleared");
5801 assert(_fields_annotations == NULL, "Should have been cleared");
5802 assert(_fields_type_annotations == NULL, "Should have been cleared");
5803 } else {
5804 // If the annotations arrays were not installed into the Annotations object,
5805 // then they have to be deallocated explicitly.
5806 MetadataFactory::free_array<u1>(_loader_data, _annotations);
5807 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
5808 Annotations::free_contents(_loader_data, _fields_annotations);
5809 Annotations::free_contents(_loader_data, _fields_type_annotations);
5810 }
5811
5812 clear_class_metadata();
5813
5814 // deallocate the klass if already created. Don't directly deallocate, but add
5815 // to the deallocate list so that the klass is removed from the CLD::_klasses list
5816 // at a safepoint.
5817 if (_klass_to_deallocate != NULL) {
5818 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5819 }
5820 }
5821
5822 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5823 TRAPS) {
5824
5825 assert(stream != NULL, "invariant");
5826 assert(_class_name != NULL, "invariant");
5827
5828 // BEGIN STREAM PARSING
5829 stream->guarantee_more(8, CHECK); // magic, major, minor
5830 // Magic value
5831 const u4 magic = stream->get_u4_fast();
5832 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5833 "Incompatible magic value %u in class file %s",
5834 magic, CHECK);
5835
5836 // Version numbers
5837 _minor_version = stream->get_u2_fast();
5838 _major_version = stream->get_u2_fast();
5839
5840 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) {
5841 ResourceMark rm;
5842 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
5843 _major_version, _minor_version, _class_name->as_C_string());
5844 Exceptions::fthrow(
5845 THREAD_AND_LOCATION,
5846 vmSymbols::java_lang_UnsupportedClassVersionError(),
5847 "Unsupported major.minor version for dump time %u.%u",
5848 _major_version,
5849 _minor_version);
5850 }
5851
5852 // Check version numbers - we check this even with verifier off
5853 if (!is_supported_version(_major_version, _minor_version)) {
5854 ResourceMark rm(THREAD);
5855 Exceptions::fthrow(
5856 THREAD_AND_LOCATION,
5857 vmSymbols::java_lang_UnsupportedClassVersionError(),
5858 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5859 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
5860 _class_name->as_C_string(),
5861 _major_version,
5862 _minor_version,
5863 JVM_CLASSFILE_MAJOR_VERSION,
5864 JVM_CLASSFILE_MINOR_VERSION);
5865 return;
5866 }
5867
5868 stream->guarantee_more(3, CHECK); // length, first cp tag
5869 u2 cp_size = stream->get_u2_fast();
5870
5871 guarantee_property(
5872 cp_size >= 1, "Illegal constant pool size %u in class file %s",
5873 cp_size, CHECK);
5874
5875 _orig_cp_size = cp_size;
5876 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
5877 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
5878 }
5879 cp_size += _max_num_patched_klasses;
5880
5881 _cp = ConstantPool::allocate(_loader_data,
5882 cp_size,
5883 CHECK);
5884
5885 ConstantPool* const cp = _cp;
5886
5887 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5888
5889 assert(cp_size == (const u2)cp->length(), "invariant");
5890
5891 // ACCESS FLAGS
5892 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5893
5894 // Access flags
5895 jint flags;
5896 // JVM_ACC_MODULE is defined in JDK-9 and later.
5897 if (_major_version >= JAVA_9_VERSION) {
5898 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5899 } else {
5900 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5901 }
5902
5903 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5904 // Set abstract bit for old class files for backward compatibility
5905 flags |= JVM_ACC_ABSTRACT;
5906 }
5907
5908 verify_legal_class_modifiers(flags, CHECK);
5909
5910 short bad_constant = class_bad_constant_seen();
5911 if (bad_constant != 0) {
5912 // Do not throw CFE until after the access_flags are checked because if
5913 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5914 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
5915 }
5916
5917 _access_flags.set_flags(flags);
5918
5919 // This class and superclass
5920 _this_class_index = stream->get_u2_fast();
5921 check_property(
5922 valid_cp_range(_this_class_index, cp_size) &&
5923 cp->tag_at(_this_class_index).is_unresolved_klass(),
5924 "Invalid this class index %u in constant pool in class file %s",
5925 _this_class_index, CHECK);
5926
5927 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5928 assert(class_name_in_cp != NULL, "class_name can't be null");
5929
5930 // Update _class_name which could be null previously
5931 // to reflect the name in the constant pool
5932 _class_name = class_name_in_cp;
5933
5934 // Don't need to check whether this class name is legal or not.
5935 // It has been checked when constant pool is parsed.
5936 // However, make sure it is not an array type.
5937 if (_need_verify) {
5938 guarantee_property(_class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
5939 "Bad class name in class file %s",
5940 CHECK);
5941 }
5942
5943 // Checks if name in class file matches requested name
5944 if (_requested_name != NULL && _requested_name != _class_name) {
5945 ResourceMark rm(THREAD);
5946 Exceptions::fthrow(
5947 THREAD_AND_LOCATION,
5948 vmSymbols::java_lang_NoClassDefFoundError(),
5949 "%s (wrong name: %s)",
5950 _class_name->as_C_string(),
5951 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
5952 );
5953 return;
5954 }
5955
5956 // if this is an anonymous class fix up its name if it's in the unnamed
5957 // package. Otherwise, throw IAE if it is in a different package than
5958 // its host class.
5959 if (_host_klass != NULL) {
5960 fix_anonymous_class_name(CHECK);
5961 }
5962
5963 // Verification prevents us from creating names with dots in them, this
5964 // asserts that that's the case.
5965 assert(is_internal_format(_class_name), "external class name format used internally");
5966
5967 if (!is_internal()) {
5968 LogTarget(Debug, class, preorder) lt;
5969 if (lt.is_enabled()){
5970 ResourceMark rm(THREAD);
5971 LogStream ls(lt);
5972 ls.print("%s", _class_name->as_klass_external_name());
5973 if (stream->source() != NULL) {
5974 ls.print(" source: %s", stream->source());
5975 }
5976 ls.cr();
5977 }
5978
5979 #if INCLUDE_CDS
5980 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
5981 if (!ClassLoader::has_jrt_entry()) {
5982 warning("DumpLoadedClassList and CDS are not supported in exploded build");
5983 DumpLoadedClassList = NULL;
5984 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
5985 _host_klass == NULL) {
5986 // Only dump the classes that can be stored into CDS archive.
5987 // Anonymous classes such as generated LambdaForm classes are also not included.
5988 oop class_loader = _loader_data->class_loader();
5989 ResourceMark rm(THREAD);
5990 bool skip = false;
5991 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
5992 // For the boot and platform class loaders, skip classes that are not found in the
5993 // java runtime image, such as those found in the --patch-module entries.
5994 // These classes can't be loaded from the archive during runtime.
5995 if (!ClassLoader::is_modules_image(stream->source()) && strncmp(stream->source(), "jrt:", 4) != 0) {
5996 skip = true;
5997 }
5998
5999 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6000 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6001 // as they can be loaded from the archive during runtime.
6002 skip = false;
6003 }
6004 }
6005 if (skip) {
6006 tty->print_cr("skip writing class %s from source %s to classlist file",
6007 _class_name->as_C_string(), stream->source());
6008 } else {
6009 classlist_file->print_cr("%s", _class_name->as_C_string());
6010 classlist_file->flush();
6011 }
6012 }
6013 }
6014 #endif
6015 }
6016
6017 // SUPERKLASS
6018 _super_class_index = stream->get_u2_fast();
6019 _super_klass = parse_super_class(cp,
6020 _super_class_index,
6021 _need_verify,
6022 CHECK);
6023
6024 // Interfaces
6025 _itfs_len = stream->get_u2_fast();
6026 parse_interfaces(stream,
6027 _itfs_len,
6028 cp,
6029 &_has_nonstatic_concrete_methods,
6030 CHECK);
6031
6032 assert(_local_interfaces != NULL, "invariant");
6033
6034 // Fields (offsets are filled in later)
6035 _fac = new FieldAllocationCount();
6036 parse_fields(stream,
6037 _access_flags.is_interface(),
6038 _fac,
6039 cp,
6040 cp_size,
6041 &_java_fields_count,
6042 CHECK);
6043
6044 assert(_fields != NULL, "invariant");
6045
6046 // Methods
6047 AccessFlags promoted_flags;
6048 parse_methods(stream,
6049 _access_flags.is_interface(),
6050 &promoted_flags,
6051 &_has_final_method,
6052 &_declares_nonstatic_concrete_methods,
6053 CHECK);
6054
6055 assert(_methods != NULL, "invariant");
6056
6057 // promote flags from parse_methods() to the klass' flags
6058 _access_flags.add_promoted_flags(promoted_flags.as_int());
6059
6060 if (_declares_nonstatic_concrete_methods) {
6061 _has_nonstatic_concrete_methods = true;
6062 }
6063
6064 // Additional attributes/annotations
6065 _parsed_annotations = new ClassAnnotationCollector();
6066 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6067
6068 assert(_inner_classes != NULL, "invariant");
6069
6070 // Finalize the Annotations metadata object,
6071 // now that all annotation arrays have been created.
6072 create_combined_annotations(CHECK);
6073
6074 // Make sure this is the end of class file stream
6075 guarantee_property(stream->at_eos(),
6076 "Extra bytes at the end of class file %s",
6077 CHECK);
6078
6079 // all bytes in stream read and parsed
6080 }
6081
6082 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6083 ConstantPool* cp,
6084 TRAPS) {
6085 assert(stream != NULL, "invariant");
6086 assert(stream->at_eos(), "invariant");
6087 assert(cp != NULL, "invariant");
6088 assert(_loader_data != NULL, "invariant");
6089
6090 if (_class_name == vmSymbols::java_lang_Object()) {
6091 check_property(_local_interfaces == Universe::the_empty_klass_array(),
6092 "java.lang.Object cannot implement an interface in class file %s",
6093 CHECK);
6094 }
6095 // We check super class after class file is parsed and format is checked
6096 if (_super_class_index > 0 && NULL ==_super_klass) {
6097 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6098 if (_access_flags.is_interface()) {
6099 // Before attempting to resolve the superclass, check for class format
6100 // errors not checked yet.
6101 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6102 "Interfaces must have java.lang.Object as superclass in class file %s",
6103 CHECK);
6104 }
6105 Handle loader(THREAD, _loader_data->class_loader());
6106 _super_klass = (const InstanceKlass*)
6107 SystemDictionary::resolve_super_or_fail(_class_name,
6108 super_class_name,
6109 loader,
6110 _protection_domain,
6111 true,
6112 CHECK);
6113 }
6114
6115 if (_super_klass != NULL) {
6116 if (_super_klass->has_nonstatic_concrete_methods()) {
6117 _has_nonstatic_concrete_methods = true;
6118 }
6119
6120 if (_super_klass->is_interface()) {
6121 ResourceMark rm(THREAD);
6122 Exceptions::fthrow(
6123 THREAD_AND_LOCATION,
6124 vmSymbols::java_lang_IncompatibleClassChangeError(),
6125 "class %s has interface %s as super class",
6126 _class_name->as_klass_external_name(),
6127 _super_klass->external_name()
6128 );
6129 return;
6130 }
6131 // Make sure super class is not final
6132 if (_super_klass->is_final()) {
6133 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6134 }
6135 }
6136
6137 // Compute the transitive list of all unique interfaces implemented by this class
6138 _transitive_interfaces =
6139 compute_transitive_interfaces(_super_klass,
6140 _local_interfaces,
6141 _loader_data,
6142 CHECK);
6143
6144 assert(_transitive_interfaces != NULL, "invariant");
6145
6146 // sort methods
6147 _method_ordering = sort_methods(_methods);
6148
6149 _all_mirandas = new GrowableArray<Method*>(20);
6150
6151 Handle loader(THREAD, _loader_data->class_loader());
6152 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6153 &_num_miranda_methods,
6154 _all_mirandas,
6155 _super_klass,
6156 _methods,
6157 _access_flags,
6158 _major_version,
6159 loader,
6160 _class_name,
6161 _local_interfaces,
6162 CHECK);
6163
6164 // Size of Java itable (in words)
6165 _itable_size = _access_flags.is_interface() ? 0 :
6166 klassItable::compute_itable_size(_transitive_interfaces);
6167
6168 assert(_fac != NULL, "invariant");
6169 assert(_parsed_annotations != NULL, "invariant");
6170
6171 _field_info = new FieldLayoutInfo();
6172 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6173
6174 // Compute reference typ
6175 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6176
6177 }
6178
6179 void ClassFileParser::set_klass(InstanceKlass* klass) {
6180
6181 #ifdef ASSERT
6182 if (klass != NULL) {
6183 assert(NULL == _klass, "leaking?");
6184 }
6185 #endif
6186
6187 _klass = klass;
6188 }
6189
6190 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6191
6192 #ifdef ASSERT
6193 if (klass != NULL) {
6194 assert(NULL == _klass_to_deallocate, "leaking?");
6195 }
6196 #endif
6197
6198 _klass_to_deallocate = klass;
6199 }
6200
6201 // Caller responsible for ResourceMark
6202 // clone stream with rewound position
6203 const ClassFileStream* ClassFileParser::clone_stream() const {
6204 assert(_stream != NULL, "invariant");
6205
6206 return _stream->clone();
6207 }
6208 // ----------------------------------------------------------------------------
6209 // debugging
6210
6211 #ifdef ASSERT
6212
6213 // return true if class_name contains no '.' (internal format is '/')
6214 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6215 if (class_name != NULL) {
6216 ResourceMark rm;
6217 char* name = class_name->as_C_string();
6218 return strchr(name, '.') == NULL;
6219 } else {
6220 return true;
6221 }
6222 }
6223
6224 #endif