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/fieldStreams.hpp"
50 #include "oops/instanceKlass.hpp"
51 #include "oops/instanceMirrorKlass.hpp"
52 #include "oops/klass.inline.hpp"
53 #include "oops/klassVtable.hpp"
54 #include "oops/metadata.hpp"
55 #include "oops/method.hpp"
56 #include "oops/oop.inline.hpp"
57 #include "oops/symbol.hpp"
58 #include "prims/jvmtiExport.hpp"
59 #include "prims/jvmtiThreadState.hpp"
60 #include "runtime/javaCalls.hpp"
61 #include "runtime/perfData.hpp"
62 #include "runtime/reflection.hpp"
63 #include "runtime/signature.hpp"
64 #include "runtime/timer.hpp"
65 #include "services/classLoadingService.hpp"
66 #include "services/threadService.hpp"
67 #include "trace/traceMacros.hpp"
68 #include "utilities/align.hpp"
69 #include "utilities/bitMap.inline.hpp"
70 #include "utilities/exceptions.hpp"
71 #include "utilities/globalDefinitions.hpp"
72 #include "utilities/growableArray.hpp"
73 #include "utilities/macros.hpp"
74 #include "utilities/ostream.hpp"
75 #include "utilities/resourceHash.hpp"
76 #if INCLUDE_CDS
77 #include "classfile/systemDictionaryShared.hpp"
78 #endif
79
80 // We generally try to create the oops directly when parsing, rather than
81 // allocating temporary data structures and copying the bytes twice. A
82 // temporary area is only needed when parsing utf8 entries in the constant
83 // pool and when parsing line number tables.
84
85 // We add assert in debug mode when class format is not checked.
86
87 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
88 #define JAVA_MIN_SUPPORTED_VERSION 45
89
90 // Used for two backward compatibility reasons:
91 // - to check for new additions to the class file format in JDK1.5
92 // - to check for bug fixes in the format checker in JDK1.5
93 #define JAVA_1_5_VERSION 49
94
95 // Used for backward compatibility reasons:
96 // - to check for javac bug fixes that happened after 1.5
97 // - also used as the max version when running in jdk6
98 #define JAVA_6_VERSION 50
99
100 // Used for backward compatibility reasons:
101 // - to disallow argument and require ACC_STATIC for <clinit> methods
102 #define JAVA_7_VERSION 51
103
104 // Extension method support.
105 #define JAVA_8_VERSION 52
106
107 #define JAVA_9_VERSION 53
108
109 #define JAVA_10_VERSION 54
110
111 #define JAVA_11_VERSION 55
112
113 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
114 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION,
115 "Unexpected bad constant pool entry");
116 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
117 }
118
119 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
120 ConstantPool* cp,
121 const int length,
122 TRAPS) {
123 assert(stream != NULL, "invariant");
124 assert(cp != NULL, "invariant");
125
126 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
127 // this function (_current can be allocated in a register, with scalar
128 // replacement of aggregates). The _current pointer is copied back to
129 // stream() when this function returns. DON'T call another method within
130 // this method that uses stream().
131 const ClassFileStream cfs1 = *stream;
132 const ClassFileStream* const cfs = &cfs1;
133
134 assert(cfs->allocated_on_stack(), "should be local");
135 debug_only(const u1* const old_current = stream->current();)
136
137 // Used for batching symbol allocations.
138 const char* names[SymbolTable::symbol_alloc_batch_size];
139 int lengths[SymbolTable::symbol_alloc_batch_size];
140 int indices[SymbolTable::symbol_alloc_batch_size];
141 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
142 int names_count = 0;
143
144 // parsing Index 0 is unused
145 for (int index = 1; index < length; index++) {
146 // Each of the following case guarantees one more byte in the stream
147 // for the following tag or the access_flags following constant pool,
148 // so we don't need bounds-check for reading tag.
149 const u1 tag = cfs->get_u1_fast();
150 switch (tag) {
151 case JVM_CONSTANT_Class : {
152 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
153 const u2 name_index = cfs->get_u2_fast();
154 cp->klass_index_at_put(index, name_index);
155 break;
156 }
157 case JVM_CONSTANT_Fieldref: {
158 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
159 const u2 class_index = cfs->get_u2_fast();
160 const u2 name_and_type_index = cfs->get_u2_fast();
161 cp->field_at_put(index, class_index, name_and_type_index);
162 break;
163 }
164 case JVM_CONSTANT_Methodref: {
165 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
166 const u2 class_index = cfs->get_u2_fast();
167 const u2 name_and_type_index = cfs->get_u2_fast();
168 cp->method_at_put(index, class_index, name_and_type_index);
169 break;
170 }
171 case JVM_CONSTANT_InterfaceMethodref: {
172 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
173 const u2 class_index = cfs->get_u2_fast();
174 const u2 name_and_type_index = cfs->get_u2_fast();
175 cp->interface_method_at_put(index, class_index, name_and_type_index);
176 break;
177 }
178 case JVM_CONSTANT_String : {
179 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
180 const u2 string_index = cfs->get_u2_fast();
181 cp->string_index_at_put(index, string_index);
182 break;
183 }
184 case JVM_CONSTANT_MethodHandle :
185 case JVM_CONSTANT_MethodType: {
186 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
187 classfile_parse_error(
188 "Class file version does not support constant tag %u in class file %s",
189 tag, CHECK);
190 }
191 if (tag == JVM_CONSTANT_MethodHandle) {
192 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
193 const u1 ref_kind = cfs->get_u1_fast();
194 const u2 method_index = cfs->get_u2_fast();
195 cp->method_handle_index_at_put(index, ref_kind, method_index);
196 }
197 else if (tag == JVM_CONSTANT_MethodType) {
198 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
199 const u2 signature_index = cfs->get_u2_fast();
200 cp->method_type_index_at_put(index, signature_index);
201 }
202 else {
203 ShouldNotReachHere();
204 }
205 break;
206 }
207 case JVM_CONSTANT_InvokeDynamic : {
208 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
209 classfile_parse_error(
210 "Class file version does not support constant tag %u in class file %s",
211 tag, CHECK);
212 }
213 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
214 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
215 const u2 name_and_type_index = cfs->get_u2_fast();
216 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
217 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
218 }
219 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
220 break;
221 }
222 case JVM_CONSTANT_Integer: {
223 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
224 const u4 bytes = cfs->get_u4_fast();
225 cp->int_at_put(index, (jint)bytes);
226 break;
227 }
228 case JVM_CONSTANT_Float: {
229 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
230 const u4 bytes = cfs->get_u4_fast();
231 cp->float_at_put(index, *(jfloat*)&bytes);
232 break;
233 }
234 case JVM_CONSTANT_Long: {
235 // A mangled type might cause you to overrun allocated memory
236 guarantee_property(index + 1 < length,
237 "Invalid constant pool entry %u in class file %s",
238 index,
239 CHECK);
240 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
241 const u8 bytes = cfs->get_u8_fast();
242 cp->long_at_put(index, bytes);
243 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
244 break;
245 }
246 case JVM_CONSTANT_Double: {
247 // A mangled type might cause you to overrun allocated memory
248 guarantee_property(index+1 < length,
249 "Invalid constant pool entry %u in class file %s",
250 index,
251 CHECK);
252 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
253 const u8 bytes = cfs->get_u8_fast();
254 cp->double_at_put(index, *(jdouble*)&bytes);
255 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
256 break;
257 }
258 case JVM_CONSTANT_NameAndType: {
259 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
260 const u2 name_index = cfs->get_u2_fast();
261 const u2 signature_index = cfs->get_u2_fast();
262 cp->name_and_type_at_put(index, name_index, signature_index);
263 break;
264 }
265 case JVM_CONSTANT_Utf8 : {
266 cfs->guarantee_more(2, CHECK); // utf8_length
267 u2 utf8_length = cfs->get_u2_fast();
268 const u1* utf8_buffer = cfs->current();
269 assert(utf8_buffer != NULL, "null utf8 buffer");
270 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
271 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
272 cfs->skip_u1_fast(utf8_length);
273
274 // Before storing the symbol, make sure it's legal
275 if (_need_verify) {
276 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
277 }
278
279 if (has_cp_patch_at(index)) {
280 Handle patch = clear_cp_patch_at(index);
281 guarantee_property(java_lang_String::is_instance(patch()),
282 "Illegal utf8 patch at %d in class file %s",
283 index,
284 CHECK);
285 const char* const str = java_lang_String::as_utf8_string(patch());
286 // (could use java_lang_String::as_symbol instead, but might as well batch them)
287 utf8_buffer = (const u1*) str;
288 utf8_length = (int) strlen(str);
289 }
290
291 unsigned int hash;
292 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
293 utf8_length,
294 hash);
295 if (result == NULL) {
296 names[names_count] = (const char*)utf8_buffer;
297 lengths[names_count] = utf8_length;
298 indices[names_count] = index;
299 hashValues[names_count++] = hash;
300 if (names_count == SymbolTable::symbol_alloc_batch_size) {
301 SymbolTable::new_symbols(_loader_data,
302 cp,
303 names_count,
304 names,
305 lengths,
306 indices,
307 hashValues,
308 CHECK);
309 names_count = 0;
310 }
311 } else {
312 cp->symbol_at_put(index, result);
313 }
314 break;
315 }
316 case 19:
317 case 20: {
318 // Record that an error occurred in these two cases but keep parsing so
319 // that ACC_Module can be checked for in the access_flags. Need to
320 // throw NoClassDefFoundError in that case.
321 if (_major_version >= JAVA_9_VERSION) {
322 cfs->guarantee_more(3, CHECK);
323 cfs->get_u2_fast();
324 set_class_bad_constant_seen(tag);
325 break;
326 }
327 }
328 default: {
329 classfile_parse_error("Unknown constant tag %u in class file %s",
330 tag,
331 CHECK);
332 break;
333 }
334 } // end of switch(tag)
335 } // end of for
336
337 // Allocate the remaining symbols
338 if (names_count > 0) {
339 SymbolTable::new_symbols(_loader_data,
340 cp,
341 names_count,
342 names,
343 lengths,
344 indices,
345 hashValues,
346 CHECK);
347 }
348
349 // Copy _current pointer of local copy back to stream.
350 assert(stream->current() == old_current, "non-exclusive use of stream");
351 stream->set_current(cfs1.current());
352
353 }
354
355 static inline bool valid_cp_range(int index, int length) {
356 return (index > 0 && index < length);
357 }
358
359 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
360 assert(cp != NULL, "invariant");
361 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
362 return cp->symbol_at(index);
363 }
364 return NULL;
365 }
366
367 #ifdef ASSERT
368 PRAGMA_DIAG_PUSH
369 PRAGMA_FORMAT_NONLITERAL_IGNORED
370 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
371 ResourceMark rm(THREAD);
372 fatal(msg, _class_name->as_C_string());
373 }
374
375 void ClassFileParser::report_assert_property_failure(const char* msg,
376 int index,
377 TRAPS) const {
378 ResourceMark rm(THREAD);
379 fatal(msg, index, _class_name->as_C_string());
380 }
381 PRAGMA_DIAG_POP
382 #endif
383
384 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
385 ConstantPool* const cp,
386 const int length,
387 TRAPS) {
388 assert(cp != NULL, "invariant");
389 assert(stream != NULL, "invariant");
390
391 // parsing constant pool entries
392 parse_constant_pool_entries(stream, cp, length, CHECK);
393 if (class_bad_constant_seen() != 0) {
394 // a bad CP entry has been detected previously so stop parsing and just return.
395 return;
396 }
397
398 int index = 1; // declared outside of loops for portability
399 int num_klasses = 0;
400
401 // first verification pass - validate cross references
402 // and fixup class and string constants
403 for (index = 1; index < length; index++) { // Index 0 is unused
404 const jbyte tag = cp->tag_at(index).value();
405 switch (tag) {
406 case JVM_CONSTANT_Class: {
407 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
408 break;
409 }
410 case JVM_CONSTANT_Fieldref:
411 // fall through
412 case JVM_CONSTANT_Methodref:
413 // fall through
414 case JVM_CONSTANT_InterfaceMethodref: {
415 if (!_need_verify) break;
416 const int klass_ref_index = cp->klass_ref_index_at(index);
417 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
418 check_property(valid_klass_reference_at(klass_ref_index),
419 "Invalid constant pool index %u in class file %s",
420 klass_ref_index, CHECK);
421 check_property(valid_cp_range(name_and_type_ref_index, length) &&
422 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
423 "Invalid constant pool index %u in class file %s",
424 name_and_type_ref_index, CHECK);
425 break;
426 }
427 case JVM_CONSTANT_String: {
428 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
429 break;
430 }
431 case JVM_CONSTANT_Integer:
432 break;
433 case JVM_CONSTANT_Float:
434 break;
435 case JVM_CONSTANT_Long:
436 case JVM_CONSTANT_Double: {
437 index++;
438 check_property(
439 (index < length && cp->tag_at(index).is_invalid()),
440 "Improper constant pool long/double index %u in class file %s",
441 index, CHECK);
442 break;
443 }
444 case JVM_CONSTANT_NameAndType: {
445 if (!_need_verify) break;
446 const int name_ref_index = cp->name_ref_index_at(index);
447 const int signature_ref_index = cp->signature_ref_index_at(index);
448 check_property(valid_symbol_at(name_ref_index),
449 "Invalid constant pool index %u in class file %s",
450 name_ref_index, CHECK);
451 check_property(valid_symbol_at(signature_ref_index),
452 "Invalid constant pool index %u in class file %s",
453 signature_ref_index, CHECK);
454 break;
455 }
456 case JVM_CONSTANT_Utf8:
457 break;
458 case JVM_CONSTANT_UnresolvedClass: // fall-through
459 case JVM_CONSTANT_UnresolvedClassInError: {
460 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
461 break;
462 }
463 case JVM_CONSTANT_ClassIndex: {
464 const int class_index = cp->klass_index_at(index);
465 check_property(valid_symbol_at(class_index),
466 "Invalid constant pool index %u in class file %s",
467 class_index, CHECK);
468 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
469 break;
470 }
471 case JVM_CONSTANT_StringIndex: {
472 const int string_index = cp->string_index_at(index);
473 check_property(valid_symbol_at(string_index),
474 "Invalid constant pool index %u in class file %s",
475 string_index, CHECK);
476 Symbol* const sym = cp->symbol_at(string_index);
477 cp->unresolved_string_at_put(index, sym);
478 break;
479 }
480 case JVM_CONSTANT_MethodHandle: {
481 const int ref_index = cp->method_handle_index_at(index);
482 check_property(valid_cp_range(ref_index, length),
483 "Invalid constant pool index %u in class file %s",
484 ref_index, CHECK);
485 const constantTag tag = cp->tag_at(ref_index);
486 const int ref_kind = cp->method_handle_ref_kind_at(index);
487
488 switch (ref_kind) {
489 case JVM_REF_getField:
490 case JVM_REF_getStatic:
491 case JVM_REF_putField:
492 case JVM_REF_putStatic: {
493 check_property(
494 tag.is_field(),
495 "Invalid constant pool index %u in class file %s (not a field)",
496 ref_index, CHECK);
497 break;
498 }
499 case JVM_REF_invokeVirtual:
500 case JVM_REF_newInvokeSpecial: {
501 check_property(
502 tag.is_method(),
503 "Invalid constant pool index %u in class file %s (not a method)",
504 ref_index, CHECK);
505 break;
506 }
507 case JVM_REF_invokeStatic:
508 case JVM_REF_invokeSpecial: {
509 check_property(
510 tag.is_method() ||
511 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
512 "Invalid constant pool index %u in class file %s (not a method)",
513 ref_index, CHECK);
514 break;
515 }
516 case JVM_REF_invokeInterface: {
517 check_property(
518 tag.is_interface_method(),
519 "Invalid constant pool index %u in class file %s (not an interface method)",
520 ref_index, CHECK);
521 break;
522 }
523 default: {
524 classfile_parse_error(
525 "Bad method handle kind at constant pool index %u in class file %s",
526 index, CHECK);
527 }
528 } // switch(refkind)
529 // Keep the ref_index unchanged. It will be indirected at link-time.
530 break;
531 } // case MethodHandle
532 case JVM_CONSTANT_MethodType: {
533 const int ref_index = cp->method_type_index_at(index);
534 check_property(valid_symbol_at(ref_index),
535 "Invalid constant pool index %u in class file %s",
536 ref_index, CHECK);
537 break;
538 }
539 case JVM_CONSTANT_InvokeDynamic: {
540 const int name_and_type_ref_index =
541 cp->invoke_dynamic_name_and_type_ref_index_at(index);
542
543 check_property(valid_cp_range(name_and_type_ref_index, length) &&
544 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
545 "Invalid constant pool index %u in class file %s",
546 name_and_type_ref_index, CHECK);
547 // bootstrap specifier index must be checked later,
548 // when BootstrapMethods attr is available
549 break;
550 }
551 default: {
552 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
553 ShouldNotReachHere();
554 break;
555 }
556 } // switch(tag)
557 } // end of for
558
559 _first_patched_klass_resolved_index = num_klasses;
560 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
561
562 if (_cp_patches != NULL) {
563 // need to treat this_class specially...
564
565 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
566 // for now. These will be replaced with actual names of the patched classes in patch_class().
567 Symbol* s = vmSymbols::star_name();
568 for (int n=_orig_cp_size; n<cp->length(); n++) {
569 cp->symbol_at_put(n, s);
570 }
571
572 int this_class_index;
573 {
574 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
575 const u1* const mark = stream->current();
576 stream->skip_u2_fast(1); // skip flags
577 this_class_index = stream->get_u2_fast();
578 stream->set_current(mark); // revert to mark
579 }
580
581 for (index = 1; index < length; index++) { // Index 0 is unused
582 if (has_cp_patch_at(index)) {
583 guarantee_property(index != this_class_index,
584 "Illegal constant pool patch to self at %d in class file %s",
585 index, CHECK);
586 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
587 }
588 }
589 }
590
591 if (!_need_verify) {
592 return;
593 }
594
595 // second verification pass - checks the strings are of the right format.
596 // but not yet to the other entries
597 for (index = 1; index < length; index++) {
598 const jbyte tag = cp->tag_at(index).value();
599 switch (tag) {
600 case JVM_CONSTANT_UnresolvedClass: {
601 const Symbol* const class_name = cp->klass_name_at(index);
602 // check the name, even if _cp_patches will overwrite it
603 verify_legal_class_name(class_name, CHECK);
604 break;
605 }
606 case JVM_CONSTANT_NameAndType: {
607 if (_need_verify) {
608 const int sig_index = cp->signature_ref_index_at(index);
609 const int name_index = cp->name_ref_index_at(index);
610 const Symbol* const name = cp->symbol_at(name_index);
611 const Symbol* const sig = cp->symbol_at(sig_index);
612 guarantee_property(sig->utf8_length() != 0,
613 "Illegal zero length constant pool entry at %d in class %s",
614 sig_index, CHECK);
615 guarantee_property(name->utf8_length() != 0,
616 "Illegal zero length constant pool entry at %d in class %s",
617 name_index, CHECK);
618
619 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
620 // Format check method name and signature
621 verify_legal_method_name(name, CHECK);
622 verify_legal_method_signature(name, sig, CHECK);
623 } else {
624 // Format check field name and signature
625 verify_legal_field_name(name, CHECK);
626 verify_legal_field_signature(name, sig, CHECK);
627 }
628 }
629 break;
630 }
631 case JVM_CONSTANT_InvokeDynamic:
632 case JVM_CONSTANT_Fieldref:
633 case JVM_CONSTANT_Methodref:
634 case JVM_CONSTANT_InterfaceMethodref: {
635 const int name_and_type_ref_index =
636 cp->name_and_type_ref_index_at(index);
637 // already verified to be utf8
638 const int name_ref_index =
639 cp->name_ref_index_at(name_and_type_ref_index);
640 // already verified to be utf8
641 const int signature_ref_index =
642 cp->signature_ref_index_at(name_and_type_ref_index);
643 const Symbol* const name = cp->symbol_at(name_ref_index);
644 const Symbol* const signature = cp->symbol_at(signature_ref_index);
645 if (tag == JVM_CONSTANT_Fieldref) {
646 if (_need_verify) {
647 // Field name and signature are verified above, when iterating NameAndType_info.
648 // Need only to be sure signature is non-zero length and the right type.
649 if (signature->utf8_length() == 0 ||
650 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
651 throwIllegalSignature("Field", name, signature, CHECK);
652 }
653 }
654 } else {
655 if (_need_verify) {
656 // Method name and signature are verified above, when iterating NameAndType_info.
657 // Need only to be sure signature is non-zero length and the right type.
658 if (signature->utf8_length() == 0 ||
659 signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
660 throwIllegalSignature("Method", name, signature, CHECK);
661 }
662 }
663 // 4509014: If a class method name begins with '<', it must be "<init>"
664 const unsigned int name_len = name->utf8_length();
665 if (tag == JVM_CONSTANT_Methodref &&
666 name_len != 0 &&
667 name->byte_at(0) == '<' &&
668 name != vmSymbols::object_initializer_name()) {
669 classfile_parse_error(
670 "Bad method name at constant pool index %u in class file %s",
671 name_ref_index, CHECK);
672 }
673 }
674 break;
675 }
676 case JVM_CONSTANT_MethodHandle: {
677 const int ref_index = cp->method_handle_index_at(index);
678 const int ref_kind = cp->method_handle_ref_kind_at(index);
679 switch (ref_kind) {
680 case JVM_REF_invokeVirtual:
681 case JVM_REF_invokeStatic:
682 case JVM_REF_invokeSpecial:
683 case JVM_REF_newInvokeSpecial: {
684 const int name_and_type_ref_index =
685 cp->name_and_type_ref_index_at(ref_index);
686 const int name_ref_index =
687 cp->name_ref_index_at(name_and_type_ref_index);
688 const Symbol* const name = cp->symbol_at(name_ref_index);
689 if (ref_kind == JVM_REF_newInvokeSpecial) {
690 if (name != vmSymbols::object_initializer_name()) {
691 classfile_parse_error(
692 "Bad constructor name at constant pool index %u in class file %s",
693 name_ref_index, CHECK);
694 }
695 } else {
696 if (name == vmSymbols::object_initializer_name()) {
697 classfile_parse_error(
698 "Bad method name at constant pool index %u in class file %s",
699 name_ref_index, CHECK);
700 }
701 }
702 break;
703 }
704 // Other ref_kinds are already fully checked in previous pass.
705 } // switch(ref_kind)
706 break;
707 }
708 case JVM_CONSTANT_MethodType: {
709 const Symbol* const no_name = vmSymbols::type_name(); // place holder
710 const Symbol* const signature = cp->method_type_signature_at(index);
711 verify_legal_method_signature(no_name, signature, CHECK);
712 break;
713 }
714 case JVM_CONSTANT_Utf8: {
715 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
716 }
717 } // switch(tag)
718 } // end of for
719 }
720
721 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
722 int name_index = _orig_cp_size + _num_patched_klasses;
723 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
724
725 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
726 _num_patched_klasses ++;
727 }
728
729 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
730 int index,
731 Handle patch,
732 TRAPS) {
733 assert(cp != NULL, "invariant");
734
735 BasicType patch_type = T_VOID;
736
737 switch (cp->tag_at(index).value()) {
738
739 case JVM_CONSTANT_UnresolvedClass: {
740 // Patching a class means pre-resolving it.
741 // The name in the constant pool is ignored.
742 if (java_lang_Class::is_instance(patch())) {
743 guarantee_property(!java_lang_Class::is_primitive(patch()),
744 "Illegal class patch at %d in class file %s",
745 index, CHECK);
746 Klass* k = java_lang_Class::as_Klass(patch());
747 patch_class(cp, index, k, k->name());
748 } else {
749 guarantee_property(java_lang_String::is_instance(patch()),
750 "Illegal class patch at %d in class file %s",
751 index, CHECK);
752 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK);
753 patch_class(cp, index, NULL, name);
754 }
755 break;
756 }
757
758 case JVM_CONSTANT_String: {
759 // skip this patch and don't clear it. Needs the oop array for resolved
760 // references to be created first.
761 return;
762 }
763 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
764 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
765 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
766 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
767 patch_prim:
768 {
769 jvalue value;
770 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
771 guarantee_property(value_type == patch_type,
772 "Illegal primitive patch at %d in class file %s",
773 index, CHECK);
774 switch (value_type) {
775 case T_INT: cp->int_at_put(index, value.i); break;
776 case T_FLOAT: cp->float_at_put(index, value.f); break;
777 case T_LONG: cp->long_at_put(index, value.j); break;
778 case T_DOUBLE: cp->double_at_put(index, value.d); break;
779 default: assert(false, "");
780 }
781 } // end patch_prim label
782 break;
783
784 default: {
785 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
786 guarantee_property(!has_cp_patch_at(index),
787 "Illegal unexpected patch at %d in class file %s",
788 index, CHECK);
789 return;
790 }
791 } // end of switch(tag)
792
793 // On fall-through, mark the patch as used.
794 clear_cp_patch_at(index);
795 }
796 class NameSigHash: public ResourceObj {
797 public:
798 const Symbol* _name; // name
799 const Symbol* _sig; // signature
800 NameSigHash* _next; // Next entry in hash table
801 };
802
803 static const int HASH_ROW_SIZE = 256;
804
805 static unsigned int hash(const Symbol* name, const Symbol* sig) {
806 unsigned int raw_hash = 0;
807 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
808 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
809
810 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
811 }
812
813
814 static void initialize_hashtable(NameSigHash** table) {
815 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
816 }
817 // Return false if the name/sig combination is found in table.
818 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
819 // The old format checker uses heap sort to find duplicates.
820 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
821 // of table since we don't expect Symbol*'s to move.
822 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
823 assert(name != NULL, "name in constant pool is NULL");
824
825 // First lookup for duplicates
826 int index = hash(name, sig);
827 NameSigHash* entry = table[index];
828 while (entry != NULL) {
829 if (entry->_name == name && entry->_sig == sig) {
830 return false;
831 }
832 entry = entry->_next;
833 }
834
835 // No duplicate is found, allocate a new entry and fill it.
836 entry = new NameSigHash();
837 entry->_name = name;
838 entry->_sig = sig;
839
840 // Insert into hash table
841 entry->_next = table[index];
842 table[index] = entry;
843
844 return true;
845 }
846
847 // Side-effects: populates the _local_interfaces field
848 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
849 const int itfs_len,
850 ConstantPool* const cp,
851 bool* const has_nonstatic_concrete_methods,
852 TRAPS) {
853 assert(stream != NULL, "invariant");
854 assert(cp != NULL, "invariant");
855 assert(has_nonstatic_concrete_methods != NULL, "invariant");
856
857 if (itfs_len == 0) {
858 _local_interfaces = Universe::the_empty_klass_array();
859 } else {
860 assert(itfs_len > 0, "only called for len>0");
861 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, itfs_len, NULL, CHECK);
862
863 int index;
864 for (index = 0; index < itfs_len; index++) {
865 const u2 interface_index = stream->get_u2(CHECK);
866 Klass* interf;
867 check_property(
868 valid_klass_reference_at(interface_index),
869 "Interface name has bad constant pool index %u in class file %s",
870 interface_index, CHECK);
871 if (cp->tag_at(interface_index).is_klass()) {
872 interf = cp->resolved_klass_at(interface_index);
873 } else {
874 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
875
876 // Don't need to check legal name because it's checked when parsing constant pool.
877 // But need to make sure it's not an array type.
878 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
879 "Bad interface name in class file %s", CHECK);
880
881 // Call resolve_super so classcircularity is checked
882 interf = SystemDictionary::resolve_super_or_fail(
883 _class_name,
884 unresolved_klass,
885 Handle(THREAD, _loader_data->class_loader()),
886 _protection_domain,
887 false,
888 CHECK);
889 }
890
891 if (!interf->is_interface()) {
892 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
893 "Implementing class");
894 }
895
896 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
897 *has_nonstatic_concrete_methods = true;
898 }
899 _local_interfaces->at_put(index, interf);
900 }
901
902 if (!_need_verify || itfs_len <= 1) {
903 return;
904 }
905
906 // Check if there's any duplicates in interfaces
907 ResourceMark rm(THREAD);
908 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
909 NameSigHash*,
910 HASH_ROW_SIZE);
911 initialize_hashtable(interface_names);
912 bool dup = false;
913 const Symbol* name = NULL;
914 {
915 debug_only(NoSafepointVerifier nsv;)
916 for (index = 0; index < itfs_len; index++) {
917 const Klass* const k = _local_interfaces->at(index);
918 name = InstanceKlass::cast(k)->name();
919 // If no duplicates, add (name, NULL) in hashtable interface_names.
920 if (!put_after_lookup(name, NULL, interface_names)) {
921 dup = true;
922 break;
923 }
924 }
925 }
926 if (dup) {
927 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
928 name->as_C_string(), CHECK);
929 }
930 }
931 }
932
933 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
934 int constantvalue_index,
935 int signature_index,
936 TRAPS) const {
937 // Make sure the constant pool entry is of a type appropriate to this field
938 guarantee_property(
939 (constantvalue_index > 0 &&
940 constantvalue_index < cp->length()),
941 "Bad initial value index %u in ConstantValue attribute in class file %s",
942 constantvalue_index, CHECK);
943
944 const constantTag value_type = cp->tag_at(constantvalue_index);
945 switch(cp->basic_type_for_signature_at(signature_index)) {
946 case T_LONG: {
947 guarantee_property(value_type.is_long(),
948 "Inconsistent constant value type in class file %s",
949 CHECK);
950 break;
951 }
952 case T_FLOAT: {
953 guarantee_property(value_type.is_float(),
954 "Inconsistent constant value type in class file %s",
955 CHECK);
956 break;
957 }
958 case T_DOUBLE: {
959 guarantee_property(value_type.is_double(),
960 "Inconsistent constant value type in class file %s",
961 CHECK);
962 break;
963 }
964 case T_BYTE:
965 case T_CHAR:
966 case T_SHORT:
967 case T_BOOLEAN:
968 case T_INT: {
969 guarantee_property(value_type.is_int(),
970 "Inconsistent constant value type in class file %s",
971 CHECK);
972 break;
973 }
974 case T_OBJECT: {
975 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
976 && value_type.is_string()),
977 "Bad string initial value in class file %s",
978 CHECK);
979 break;
980 }
981 default: {
982 classfile_parse_error("Unable to set initial value %u in class file %s",
983 constantvalue_index,
984 CHECK);
985 }
986 }
987 }
988
989 class AnnotationCollector : public ResourceObj{
990 public:
991 enum Location { _in_field, _in_method, _in_class };
992 enum ID {
993 _unknown = 0,
994 _method_CallerSensitive,
995 _method_ForceInline,
996 _method_DontInline,
997 _method_InjectedProfile,
998 _method_LambdaForm_Compiled,
999 _method_LambdaForm_Hidden,
1000 _method_HotSpotIntrinsicCandidate,
1001 _jdk_internal_vm_annotation_Contended,
1002 _field_Stable,
1003 _jdk_internal_vm_annotation_ReservedStackAccess,
1004 _annotation_LIMIT
1005 };
1006 const Location _location;
1007 int _annotations_present;
1008 u2 _contended_group;
1009
1010 AnnotationCollector(Location location)
1011 : _location(location), _annotations_present(0)
1012 {
1013 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1014 }
1015 // If this annotation name has an ID, report it (or _none).
1016 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1017 // Set the annotation name:
1018 void set_annotation(ID id) {
1019 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1020 _annotations_present |= nth_bit((int)id);
1021 }
1022
1023 void remove_annotation(ID id) {
1024 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1025 _annotations_present &= ~nth_bit((int)id);
1026 }
1027
1028 // Report if the annotation is present.
1029 bool has_any_annotations() const { return _annotations_present != 0; }
1030 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1031
1032 void set_contended_group(u2 group) { _contended_group = group; }
1033 u2 contended_group() const { return _contended_group; }
1034
1035 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1036
1037 void set_stable(bool stable) { set_annotation(_field_Stable); }
1038 bool is_stable() const { return has_annotation(_field_Stable); }
1039 };
1040
1041 // This class also doubles as a holder for metadata cleanup.
1042 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1043 private:
1044 ClassLoaderData* _loader_data;
1045 AnnotationArray* _field_annotations;
1046 AnnotationArray* _field_type_annotations;
1047 public:
1048 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1049 AnnotationCollector(_in_field),
1050 _loader_data(loader_data),
1051 _field_annotations(NULL),
1052 _field_type_annotations(NULL) {}
1053 ~FieldAnnotationCollector();
1054 void apply_to(FieldInfo* f);
1055 AnnotationArray* field_annotations() { return _field_annotations; }
1056 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1057
1058 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1059 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1060 };
1061
1062 class MethodAnnotationCollector : public AnnotationCollector{
1063 public:
1064 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1065 void apply_to(const methodHandle& m);
1066 };
1067
1068 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1069 public:
1070 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1071 void apply_to(InstanceKlass* ik);
1072 };
1073
1074
1075 static int skip_annotation_value(const u1*, int, int); // fwd decl
1076
1077 // Safely increment index by val if does not pass limit
1078 #define SAFE_ADD(index, limit, val) \
1079 if (index >= limit - val) return limit; \
1080 index += val;
1081
1082 // Skip an annotation. Return >=limit if there is any problem.
1083 static int skip_annotation(const u1* buffer, int limit, int index) {
1084 assert(buffer != NULL, "invariant");
1085 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1086 // value := switch (tag:u1) { ... }
1087 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1088 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1089 while (--nmem >= 0 && index < limit) {
1090 SAFE_ADD(index, limit, 2); // skip member
1091 index = skip_annotation_value(buffer, limit, index);
1092 }
1093 return index;
1094 }
1095
1096 // Skip an annotation value. Return >=limit if there is any problem.
1097 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1098 assert(buffer != NULL, "invariant");
1099
1100 // value := switch (tag:u1) {
1101 // case B, C, I, S, Z, D, F, J, c: con:u2;
1102 // case e: e_class:u2 e_name:u2;
1103 // case s: s_con:u2;
1104 // case [: do(nval:u2) {value};
1105 // case @: annotation;
1106 // case s: s_con:u2;
1107 // }
1108 SAFE_ADD(index, limit, 1); // read tag
1109 const u1 tag = buffer[index - 1];
1110 switch (tag) {
1111 case 'B':
1112 case 'C':
1113 case 'I':
1114 case 'S':
1115 case 'Z':
1116 case 'D':
1117 case 'F':
1118 case 'J':
1119 case 'c':
1120 case 's':
1121 SAFE_ADD(index, limit, 2); // skip con or s_con
1122 break;
1123 case 'e':
1124 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1125 break;
1126 case '[':
1127 {
1128 SAFE_ADD(index, limit, 2); // read nval
1129 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1130 while (--nval >= 0 && index < limit) {
1131 index = skip_annotation_value(buffer, limit, index);
1132 }
1133 }
1134 break;
1135 case '@':
1136 index = skip_annotation(buffer, limit, index);
1137 break;
1138 default:
1139 return limit; // bad tag byte
1140 }
1141 return index;
1142 }
1143
1144 // Sift through annotations, looking for those significant to the VM:
1145 static void parse_annotations(const ConstantPool* const cp,
1146 const u1* buffer, int limit,
1147 AnnotationCollector* coll,
1148 ClassLoaderData* loader_data,
1149 TRAPS) {
1150
1151 assert(cp != NULL, "invariant");
1152 assert(buffer != NULL, "invariant");
1153 assert(coll != NULL, "invariant");
1154 assert(loader_data != NULL, "invariant");
1155
1156 // annotations := do(nann:u2) {annotation}
1157 int index = 2; // read nann
1158 if (index >= limit) return;
1159 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1160 enum { // initial annotation layout
1161 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1162 count_off = 2, // u2 such as 1 (one value)
1163 member_off = 4, // utf8 such as 'value'
1164 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1165 e_tag_val = 'e',
1166 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1167 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1168 e_size = 11, // end of 'e' annotation
1169 c_tag_val = 'c', // payload is type
1170 c_con_off = 7, // utf8 payload, such as 'I'
1171 c_size = 9, // end of 'c' annotation
1172 s_tag_val = 's', // payload is String
1173 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1174 s_size = 9,
1175 min_size = 6 // smallest possible size (zero members)
1176 };
1177 // Cannot add min_size to index in case of overflow MAX_INT
1178 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1179 int index0 = index;
1180 index = skip_annotation(buffer, limit, index);
1181 const u1* const abase = buffer + index0;
1182 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1183 const int count = Bytes::get_Java_u2((address)abase + count_off);
1184 const Symbol* const aname = check_symbol_at(cp, atype);
1185 if (aname == NULL) break; // invalid annotation name
1186 const Symbol* member = NULL;
1187 if (count >= 1) {
1188 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1189 member = check_symbol_at(cp, member_index);
1190 if (member == NULL) break; // invalid member name
1191 }
1192
1193 // Here is where parsing particular annotations will take place.
1194 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1195 if (AnnotationCollector::_unknown == id) continue;
1196 coll->set_annotation(id);
1197
1198 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1199 // @Contended can optionally specify the contention group.
1200 //
1201 // Contended group defines the equivalence class over the fields:
1202 // the fields within the same contended group are not treated distinct.
1203 // The only exception is default group, which does not incur the
1204 // equivalence. Naturally, contention group for classes is meaningless.
1205 //
1206 // While the contention group is specified as String, annotation
1207 // values are already interned, and we might as well use the constant
1208 // pool index as the group tag.
1209 //
1210 u2 group_index = 0; // default contended group
1211 if (count == 1
1212 && s_size == (index - index0) // match size
1213 && s_tag_val == *(abase + tag_off)
1214 && member == vmSymbols::value_name()) {
1215 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1216 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1217 group_index = 0; // default contended group
1218 }
1219 }
1220 coll->set_contended_group(group_index);
1221 }
1222 }
1223 }
1224
1225
1226 // Parse attributes for a field.
1227 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1228 u2 attributes_count,
1229 bool is_static, u2 signature_index,
1230 u2* const constantvalue_index_addr,
1231 bool* const is_synthetic_addr,
1232 u2* const generic_signature_index_addr,
1233 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1234 TRAPS) {
1235 assert(cfs != NULL, "invariant");
1236 assert(constantvalue_index_addr != NULL, "invariant");
1237 assert(is_synthetic_addr != NULL, "invariant");
1238 assert(generic_signature_index_addr != NULL, "invariant");
1239 assert(parsed_annotations != NULL, "invariant");
1240 assert(attributes_count > 0, "attributes_count should be greater than 0");
1241
1242 u2 constantvalue_index = 0;
1243 u2 generic_signature_index = 0;
1244 bool is_synthetic = false;
1245 const u1* runtime_visible_annotations = NULL;
1246 int runtime_visible_annotations_length = 0;
1247 const u1* runtime_invisible_annotations = NULL;
1248 int runtime_invisible_annotations_length = 0;
1249 const u1* runtime_visible_type_annotations = NULL;
1250 int runtime_visible_type_annotations_length = 0;
1251 const u1* runtime_invisible_type_annotations = NULL;
1252 int runtime_invisible_type_annotations_length = 0;
1253 bool runtime_invisible_annotations_exists = false;
1254 bool runtime_invisible_type_annotations_exists = false;
1255 const ConstantPool* const cp = _cp;
1256
1257 while (attributes_count--) {
1258 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1259 const u2 attribute_name_index = cfs->get_u2_fast();
1260 const u4 attribute_length = cfs->get_u4_fast();
1261 check_property(valid_symbol_at(attribute_name_index),
1262 "Invalid field attribute index %u in class file %s",
1263 attribute_name_index,
1264 CHECK);
1265
1266 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1267 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1268 // ignore if non-static
1269 if (constantvalue_index != 0) {
1270 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1271 }
1272 check_property(
1273 attribute_length == 2,
1274 "Invalid ConstantValue field attribute length %u in class file %s",
1275 attribute_length, CHECK);
1276
1277 constantvalue_index = cfs->get_u2(CHECK);
1278 if (_need_verify) {
1279 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1280 }
1281 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1282 if (attribute_length != 0) {
1283 classfile_parse_error(
1284 "Invalid Synthetic field attribute length %u in class file %s",
1285 attribute_length, CHECK);
1286 }
1287 is_synthetic = true;
1288 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1289 if (attribute_length != 0) {
1290 classfile_parse_error(
1291 "Invalid Deprecated field attribute length %u in class file %s",
1292 attribute_length, CHECK);
1293 }
1294 } else if (_major_version >= JAVA_1_5_VERSION) {
1295 if (attribute_name == vmSymbols::tag_signature()) {
1296 if (generic_signature_index != 0) {
1297 classfile_parse_error(
1298 "Multiple Signature attributes for field in class file %s", CHECK);
1299 }
1300 if (attribute_length != 2) {
1301 classfile_parse_error(
1302 "Wrong size %u for field's Signature attribute in class file %s",
1303 attribute_length, CHECK);
1304 }
1305 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1306 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1307 if (runtime_visible_annotations != NULL) {
1308 classfile_parse_error(
1309 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1310 }
1311 runtime_visible_annotations_length = attribute_length;
1312 runtime_visible_annotations = cfs->current();
1313 assert(runtime_visible_annotations != NULL, "null visible annotations");
1314 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1315 parse_annotations(cp,
1316 runtime_visible_annotations,
1317 runtime_visible_annotations_length,
1318 parsed_annotations,
1319 _loader_data,
1320 CHECK);
1321 cfs->skip_u1_fast(runtime_visible_annotations_length);
1322 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1323 if (runtime_invisible_annotations_exists) {
1324 classfile_parse_error(
1325 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1326 }
1327 runtime_invisible_annotations_exists = true;
1328 if (PreserveAllAnnotations) {
1329 runtime_invisible_annotations_length = attribute_length;
1330 runtime_invisible_annotations = cfs->current();
1331 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1332 }
1333 cfs->skip_u1(attribute_length, CHECK);
1334 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1335 if (runtime_visible_type_annotations != NULL) {
1336 classfile_parse_error(
1337 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1338 }
1339 runtime_visible_type_annotations_length = attribute_length;
1340 runtime_visible_type_annotations = cfs->current();
1341 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1342 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1343 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1344 if (runtime_invisible_type_annotations_exists) {
1345 classfile_parse_error(
1346 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1347 } else {
1348 runtime_invisible_type_annotations_exists = true;
1349 }
1350 if (PreserveAllAnnotations) {
1351 runtime_invisible_type_annotations_length = attribute_length;
1352 runtime_invisible_type_annotations = cfs->current();
1353 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1354 }
1355 cfs->skip_u1(attribute_length, CHECK);
1356 } else {
1357 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1358 }
1359 } else {
1360 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1361 }
1362 }
1363
1364 *constantvalue_index_addr = constantvalue_index;
1365 *is_synthetic_addr = is_synthetic;
1366 *generic_signature_index_addr = generic_signature_index;
1367 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1368 runtime_visible_annotations_length,
1369 runtime_invisible_annotations,
1370 runtime_invisible_annotations_length,
1371 CHECK);
1372 parsed_annotations->set_field_annotations(a);
1373 a = assemble_annotations(runtime_visible_type_annotations,
1374 runtime_visible_type_annotations_length,
1375 runtime_invisible_type_annotations,
1376 runtime_invisible_type_annotations_length,
1377 CHECK);
1378 parsed_annotations->set_field_type_annotations(a);
1379 return;
1380 }
1381
1382
1383 // Field allocation types. Used for computing field offsets.
1384
1385 enum FieldAllocationType {
1386 STATIC_OOP, // Oops
1387 STATIC_BYTE, // Boolean, Byte, char
1388 STATIC_SHORT, // shorts
1389 STATIC_WORD, // ints
1390 STATIC_DOUBLE, // aligned long or double
1391 NONSTATIC_OOP,
1392 NONSTATIC_BYTE,
1393 NONSTATIC_SHORT,
1394 NONSTATIC_WORD,
1395 NONSTATIC_DOUBLE,
1396 MAX_FIELD_ALLOCATION_TYPE,
1397 BAD_ALLOCATION_TYPE = -1
1398 };
1399
1400 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1401 BAD_ALLOCATION_TYPE, // 0
1402 BAD_ALLOCATION_TYPE, // 1
1403 BAD_ALLOCATION_TYPE, // 2
1404 BAD_ALLOCATION_TYPE, // 3
1405 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1406 NONSTATIC_SHORT, // T_CHAR = 5,
1407 NONSTATIC_WORD, // T_FLOAT = 6,
1408 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1409 NONSTATIC_BYTE, // T_BYTE = 8,
1410 NONSTATIC_SHORT, // T_SHORT = 9,
1411 NONSTATIC_WORD, // T_INT = 10,
1412 NONSTATIC_DOUBLE, // T_LONG = 11,
1413 NONSTATIC_OOP, // T_OBJECT = 12,
1414 NONSTATIC_OOP, // T_ARRAY = 13,
1415 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1416 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1417 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1418 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1419 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1420 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1421 BAD_ALLOCATION_TYPE, // 0
1422 BAD_ALLOCATION_TYPE, // 1
1423 BAD_ALLOCATION_TYPE, // 2
1424 BAD_ALLOCATION_TYPE, // 3
1425 STATIC_BYTE , // T_BOOLEAN = 4,
1426 STATIC_SHORT, // T_CHAR = 5,
1427 STATIC_WORD, // T_FLOAT = 6,
1428 STATIC_DOUBLE, // T_DOUBLE = 7,
1429 STATIC_BYTE, // T_BYTE = 8,
1430 STATIC_SHORT, // T_SHORT = 9,
1431 STATIC_WORD, // T_INT = 10,
1432 STATIC_DOUBLE, // T_LONG = 11,
1433 STATIC_OOP, // T_OBJECT = 12,
1434 STATIC_OOP, // T_ARRAY = 13,
1435 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1436 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1437 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1438 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1439 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1440 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1441 };
1442
1443 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1444 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1445 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1446 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1447 return result;
1448 }
1449
1450 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1451 public:
1452 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1453
1454 FieldAllocationCount() {
1455 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1456 count[i] = 0;
1457 }
1458 }
1459
1460 FieldAllocationType update(bool is_static, BasicType type) {
1461 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1462 if (atype != BAD_ALLOCATION_TYPE) {
1463 // Make sure there is no overflow with injected fields.
1464 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1465 count[atype]++;
1466 }
1467 return atype;
1468 }
1469 };
1470
1471 // Side-effects: populates the _fields, _fields_annotations,
1472 // _fields_type_annotations fields
1473 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1474 bool is_interface,
1475 FieldAllocationCount* const fac,
1476 ConstantPool* cp,
1477 const int cp_size,
1478 u2* const java_fields_count_ptr,
1479 TRAPS) {
1480
1481 assert(cfs != NULL, "invariant");
1482 assert(fac != NULL, "invariant");
1483 assert(cp != NULL, "invariant");
1484 assert(java_fields_count_ptr != NULL, "invariant");
1485
1486 assert(NULL == _fields, "invariant");
1487 assert(NULL == _fields_annotations, "invariant");
1488 assert(NULL == _fields_type_annotations, "invariant");
1489
1490 cfs->guarantee_more(2, CHECK); // length
1491 const u2 length = cfs->get_u2_fast();
1492 *java_fields_count_ptr = length;
1493
1494 int num_injected = 0;
1495 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1496 &num_injected);
1497 const int total_fields = length + num_injected;
1498
1499 // The field array starts with tuples of shorts
1500 // [access, name index, sig index, initial value index, byte offset].
1501 // A generic signature slot only exists for field with generic
1502 // signature attribute. And the access flag is set with
1503 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1504 // signature slots are at the end of the field array and after all
1505 // other fields data.
1506 //
1507 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1508 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1509 // ...
1510 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1511 // [generic signature index]
1512 // [generic signature index]
1513 // ...
1514 //
1515 // Allocate a temporary resource array for field data. For each field,
1516 // a slot is reserved in the temporary array for the generic signature
1517 // index. After parsing all fields, the data are copied to a permanent
1518 // array and any unused slots will be discarded.
1519 ResourceMark rm(THREAD);
1520 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1521 u2,
1522 total_fields * (FieldInfo::field_slots + 1));
1523
1524 // The generic signature slots start after all other fields' data.
1525 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1526 int num_generic_signature = 0;
1527 for (int n = 0; n < length; n++) {
1528 // access_flags, name_index, descriptor_index, attributes_count
1529 cfs->guarantee_more(8, CHECK);
1530
1531 AccessFlags access_flags;
1532 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1533 verify_legal_field_modifiers(flags, is_interface, CHECK);
1534 access_flags.set_flags(flags);
1535
1536 const u2 name_index = cfs->get_u2_fast();
1537 check_property(valid_symbol_at(name_index),
1538 "Invalid constant pool index %u for field name in class file %s",
1539 name_index, CHECK);
1540 const Symbol* const name = cp->symbol_at(name_index);
1541 verify_legal_field_name(name, CHECK);
1542
1543 const u2 signature_index = cfs->get_u2_fast();
1544 check_property(valid_symbol_at(signature_index),
1545 "Invalid constant pool index %u for field signature in class file %s",
1546 signature_index, CHECK);
1547 const Symbol* const sig = cp->symbol_at(signature_index);
1548 verify_legal_field_signature(name, sig, CHECK);
1549
1550 u2 constantvalue_index = 0;
1551 bool is_synthetic = false;
1552 u2 generic_signature_index = 0;
1553 const bool is_static = access_flags.is_static();
1554 FieldAnnotationCollector parsed_annotations(_loader_data);
1555
1556 const u2 attributes_count = cfs->get_u2_fast();
1557 if (attributes_count > 0) {
1558 parse_field_attributes(cfs,
1559 attributes_count,
1560 is_static,
1561 signature_index,
1562 &constantvalue_index,
1563 &is_synthetic,
1564 &generic_signature_index,
1565 &parsed_annotations,
1566 CHECK);
1567
1568 if (parsed_annotations.field_annotations() != NULL) {
1569 if (_fields_annotations == NULL) {
1570 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1571 _loader_data, length, NULL,
1572 CHECK);
1573 }
1574 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1575 parsed_annotations.set_field_annotations(NULL);
1576 }
1577 if (parsed_annotations.field_type_annotations() != NULL) {
1578 if (_fields_type_annotations == NULL) {
1579 _fields_type_annotations =
1580 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1581 length,
1582 NULL,
1583 CHECK);
1584 }
1585 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1586 parsed_annotations.set_field_type_annotations(NULL);
1587 }
1588
1589 if (is_synthetic) {
1590 access_flags.set_is_synthetic();
1591 }
1592 if (generic_signature_index != 0) {
1593 access_flags.set_field_has_generic_signature();
1594 fa[generic_signature_slot] = generic_signature_index;
1595 generic_signature_slot ++;
1596 num_generic_signature ++;
1597 }
1598 }
1599
1600 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1601 field->initialize(access_flags.as_short(),
1602 name_index,
1603 signature_index,
1604 constantvalue_index);
1605 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1606
1607 // Remember how many oops we encountered and compute allocation type
1608 const FieldAllocationType atype = fac->update(is_static, type);
1609 field->set_allocation_type(atype);
1610
1611 // After field is initialized with type, we can augment it with aux info
1612 if (parsed_annotations.has_any_annotations())
1613 parsed_annotations.apply_to(field);
1614 }
1615
1616 int index = length;
1617 if (num_injected != 0) {
1618 for (int n = 0; n < num_injected; n++) {
1619 // Check for duplicates
1620 if (injected[n].may_be_java) {
1621 const Symbol* const name = injected[n].name();
1622 const Symbol* const signature = injected[n].signature();
1623 bool duplicate = false;
1624 for (int i = 0; i < length; i++) {
1625 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1626 if (name == cp->symbol_at(f->name_index()) &&
1627 signature == cp->symbol_at(f->signature_index())) {
1628 // Symbol is desclared in Java so skip this one
1629 duplicate = true;
1630 break;
1631 }
1632 }
1633 if (duplicate) {
1634 // These will be removed from the field array at the end
1635 continue;
1636 }
1637 }
1638
1639 // Injected field
1640 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1641 field->initialize(JVM_ACC_FIELD_INTERNAL,
1642 injected[n].name_index,
1643 injected[n].signature_index,
1644 0);
1645
1646 const BasicType type = FieldType::basic_type(injected[n].signature());
1647
1648 // Remember how many oops we encountered and compute allocation type
1649 const FieldAllocationType atype = fac->update(false, type);
1650 field->set_allocation_type(atype);
1651 index++;
1652 }
1653 }
1654
1655 assert(NULL == _fields, "invariant");
1656
1657 _fields =
1658 MetadataFactory::new_array<u2>(_loader_data,
1659 index * FieldInfo::field_slots + num_generic_signature,
1660 CHECK);
1661 // Sometimes injected fields already exist in the Java source so
1662 // the fields array could be too long. In that case the
1663 // fields array is trimed. Also unused slots that were reserved
1664 // for generic signature indexes are discarded.
1665 {
1666 int i = 0;
1667 for (; i < index * FieldInfo::field_slots; i++) {
1668 _fields->at_put(i, fa[i]);
1669 }
1670 for (int j = total_fields * FieldInfo::field_slots;
1671 j < generic_signature_slot; j++) {
1672 _fields->at_put(i++, fa[j]);
1673 }
1674 assert(_fields->length() == i, "");
1675 }
1676
1677 if (_need_verify && length > 1) {
1678 // Check duplicated fields
1679 ResourceMark rm(THREAD);
1680 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1681 THREAD, NameSigHash*, HASH_ROW_SIZE);
1682 initialize_hashtable(names_and_sigs);
1683 bool dup = false;
1684 const Symbol* name = NULL;
1685 const Symbol* sig = NULL;
1686 {
1687 debug_only(NoSafepointVerifier nsv;)
1688 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1689 name = fs.name();
1690 sig = fs.signature();
1691 // If no duplicates, add name/signature in hashtable names_and_sigs.
1692 if (!put_after_lookup(name, sig, names_and_sigs)) {
1693 dup = true;
1694 break;
1695 }
1696 }
1697 }
1698 if (dup) {
1699 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1700 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1701 }
1702 }
1703 }
1704
1705
1706 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1707 u4 code_length,
1708 u4 exception_table_length,
1709 TRAPS) {
1710 assert(cfs != NULL, "invariant");
1711
1712 const unsafe_u2* const exception_table_start = cfs->current();
1713 assert(exception_table_start != NULL, "null exception table");
1714
1715 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1716 // end_pc,
1717 // handler_pc,
1718 // catch_type_index
1719
1720 // Will check legal target after parsing code array in verifier.
1721 if (_need_verify) {
1722 for (unsigned int i = 0; i < exception_table_length; i++) {
1723 const u2 start_pc = cfs->get_u2_fast();
1724 const u2 end_pc = cfs->get_u2_fast();
1725 const u2 handler_pc = cfs->get_u2_fast();
1726 const u2 catch_type_index = cfs->get_u2_fast();
1727 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1728 "Illegal exception table range in class file %s",
1729 CHECK_NULL);
1730 guarantee_property(handler_pc < code_length,
1731 "Illegal exception table handler in class file %s",
1732 CHECK_NULL);
1733 if (catch_type_index != 0) {
1734 guarantee_property(valid_klass_reference_at(catch_type_index),
1735 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1736 }
1737 }
1738 } else {
1739 cfs->skip_u2_fast(exception_table_length * 4);
1740 }
1741 return exception_table_start;
1742 }
1743
1744 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1745 u4 code_length,
1746 CompressedLineNumberWriteStream**const write_stream,
1747 TRAPS) {
1748
1749 const ClassFileStream* const cfs = _stream;
1750 unsigned int num_entries = cfs->get_u2(CHECK);
1751
1752 // Each entry is a u2 start_pc, and a u2 line_number
1753 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1754
1755 // Verify line number attribute and table length
1756 check_property(
1757 code_attribute_length == sizeof(u2) + length_in_bytes,
1758 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1759
1760 cfs->guarantee_more(length_in_bytes, CHECK);
1761
1762 if ((*write_stream) == NULL) {
1763 if (length_in_bytes > fixed_buffer_size) {
1764 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1765 } else {
1766 (*write_stream) = new CompressedLineNumberWriteStream(
1767 _linenumbertable_buffer, fixed_buffer_size);
1768 }
1769 }
1770
1771 while (num_entries-- > 0) {
1772 const u2 bci = cfs->get_u2_fast(); // start_pc
1773 const u2 line = cfs->get_u2_fast(); // line_number
1774 guarantee_property(bci < code_length,
1775 "Invalid pc in LineNumberTable in class file %s", CHECK);
1776 (*write_stream)->write_pair(bci, line);
1777 }
1778 }
1779
1780
1781 class LVT_Hash : public AllStatic {
1782 public:
1783
1784 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1785 /*
1786 * 3-tuple start_bci/length/slot has to be unique key,
1787 * so the following comparison seems to be redundant:
1788 * && elem->name_cp_index == entry->_elem->name_cp_index
1789 */
1790 return (e0.start_bci == e1.start_bci &&
1791 e0.length == e1.length &&
1792 e0.name_cp_index == e1.name_cp_index &&
1793 e0.slot == e1.slot);
1794 }
1795
1796 static unsigned int hash(LocalVariableTableElement const& e0) {
1797 unsigned int raw_hash = e0.start_bci;
1798
1799 raw_hash = e0.length + raw_hash * 37;
1800 raw_hash = e0.name_cp_index + raw_hash * 37;
1801 raw_hash = e0.slot + raw_hash * 37;
1802
1803 return raw_hash;
1804 }
1805 };
1806
1807
1808 // Class file LocalVariableTable elements.
1809 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1810 public:
1811 u2 start_bci;
1812 u2 length;
1813 u2 name_cp_index;
1814 u2 descriptor_cp_index;
1815 u2 slot;
1816 };
1817
1818 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1819 LocalVariableTableElement* const lvt) {
1820 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1821 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1822 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1823 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1824 lvt->signature_cp_index = 0;
1825 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1826 }
1827
1828 // Function is used to parse both attributes:
1829 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1830 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1831 u4 code_length,
1832 u2 max_locals,
1833 u4 code_attribute_length,
1834 u2* const localvariable_table_length,
1835 bool isLVTT,
1836 TRAPS) {
1837 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1838 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1839 const unsigned int size =
1840 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1841
1842 const ConstantPool* const cp = _cp;
1843
1844 // Verify local variable table attribute has right length
1845 if (_need_verify) {
1846 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1847 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1848 }
1849
1850 const unsafe_u2* const localvariable_table_start = cfs->current();
1851 assert(localvariable_table_start != NULL, "null local variable table");
1852 if (!_need_verify) {
1853 cfs->skip_u2_fast(size);
1854 } else {
1855 cfs->guarantee_more(size * 2, CHECK_NULL);
1856 for(int i = 0; i < (*localvariable_table_length); i++) {
1857 const u2 start_pc = cfs->get_u2_fast();
1858 const u2 length = cfs->get_u2_fast();
1859 const u2 name_index = cfs->get_u2_fast();
1860 const u2 descriptor_index = cfs->get_u2_fast();
1861 const u2 index = cfs->get_u2_fast();
1862 // Assign to a u4 to avoid overflow
1863 const u4 end_pc = (u4)start_pc + (u4)length;
1864
1865 if (start_pc >= code_length) {
1866 classfile_parse_error(
1867 "Invalid start_pc %u in %s in class file %s",
1868 start_pc, tbl_name, CHECK_NULL);
1869 }
1870 if (end_pc > code_length) {
1871 classfile_parse_error(
1872 "Invalid length %u in %s in class file %s",
1873 length, tbl_name, CHECK_NULL);
1874 }
1875 const int cp_size = cp->length();
1876 guarantee_property(valid_symbol_at(name_index),
1877 "Name index %u in %s has bad constant type in class file %s",
1878 name_index, tbl_name, CHECK_NULL);
1879 guarantee_property(valid_symbol_at(descriptor_index),
1880 "Signature index %u in %s has bad constant type in class file %s",
1881 descriptor_index, tbl_name, CHECK_NULL);
1882
1883 const Symbol* const name = cp->symbol_at(name_index);
1884 const Symbol* const sig = cp->symbol_at(descriptor_index);
1885 verify_legal_field_name(name, CHECK_NULL);
1886 u2 extra_slot = 0;
1887 if (!isLVTT) {
1888 verify_legal_field_signature(name, sig, CHECK_NULL);
1889
1890 // 4894874: check special cases for double and long local variables
1891 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1892 sig == vmSymbols::type_signature(T_LONG)) {
1893 extra_slot = 1;
1894 }
1895 }
1896 guarantee_property((index + extra_slot) < max_locals,
1897 "Invalid index %u in %s in class file %s",
1898 index, tbl_name, CHECK_NULL);
1899 }
1900 }
1901 return localvariable_table_start;
1902 }
1903
1904
1905 void ClassFileParser::parse_type_array(u2 array_length,
1906 u4 code_length,
1907 u4* const u1_index,
1908 u4* const u2_index,
1909 u1* const u1_array,
1910 u2* const u2_array,
1911 TRAPS) {
1912 const ClassFileStream* const cfs = _stream;
1913 u2 index = 0; // index in the array with long/double occupying two slots
1914 u4 i1 = *u1_index;
1915 u4 i2 = *u2_index + 1;
1916 for(int i = 0; i < array_length; i++) {
1917 const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1918 index++;
1919 if (tag == ITEM_Long || tag == ITEM_Double) {
1920 index++;
1921 } else if (tag == ITEM_Object) {
1922 const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1923 guarantee_property(valid_klass_reference_at(class_index),
1924 "Bad class index %u in StackMap in class file %s",
1925 class_index, CHECK);
1926 } else if (tag == ITEM_Uninitialized) {
1927 const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1928 guarantee_property(
1929 offset < code_length,
1930 "Bad uninitialized type offset %u in StackMap in class file %s",
1931 offset, CHECK);
1932 } else {
1933 guarantee_property(
1934 tag <= (u1)ITEM_Uninitialized,
1935 "Unknown variable type %u in StackMap in class file %s",
1936 tag, CHECK);
1937 }
1938 }
1939 u2_array[*u2_index] = index;
1940 *u1_index = i1;
1941 *u2_index = i2;
1942 }
1943
1944 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1945 u4 code_attribute_length,
1946 bool need_verify,
1947 TRAPS) {
1948 assert(cfs != NULL, "invariant");
1949
1950 if (0 == code_attribute_length) {
1951 return NULL;
1952 }
1953
1954 const u1* const stackmap_table_start = cfs->current();
1955 assert(stackmap_table_start != NULL, "null stackmap table");
1956
1957 // check code_attribute_length first
1958 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1959
1960 if (!need_verify && !DumpSharedSpaces) {
1961 return NULL;
1962 }
1963 return stackmap_table_start;
1964 }
1965
1966 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1967 u2* const checked_exceptions_length,
1968 u4 method_attribute_length,
1969 TRAPS) {
1970 assert(cfs != NULL, "invariant");
1971 assert(checked_exceptions_length != NULL, "invariant");
1972
1973 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1974 *checked_exceptions_length = cfs->get_u2_fast();
1975 const unsigned int size =
1976 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1977 const unsafe_u2* const checked_exceptions_start = cfs->current();
1978 assert(checked_exceptions_start != NULL, "null checked exceptions");
1979 if (!_need_verify) {
1980 cfs->skip_u2_fast(size);
1981 } else {
1982 // Verify each value in the checked exception table
1983 u2 checked_exception;
1984 const u2 len = *checked_exceptions_length;
1985 cfs->guarantee_more(2 * len, CHECK_NULL);
1986 for (int i = 0; i < len; i++) {
1987 checked_exception = cfs->get_u2_fast();
1988 check_property(
1989 valid_klass_reference_at(checked_exception),
1990 "Exception name has bad type at constant pool %u in class file %s",
1991 checked_exception, CHECK_NULL);
1992 }
1993 }
1994 // check exceptions attribute length
1995 if (_need_verify) {
1996 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1997 sizeof(u2) * size),
1998 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1999 }
2000 return checked_exceptions_start;
2001 }
2002
2003 void ClassFileParser::throwIllegalSignature(const char* type,
2004 const Symbol* name,
2005 const Symbol* sig,
2006 TRAPS) const {
2007 assert(name != NULL, "invariant");
2008 assert(sig != NULL, "invariant");
2009
2010 ResourceMark rm(THREAD);
2011 Exceptions::fthrow(THREAD_AND_LOCATION,
2012 vmSymbols::java_lang_ClassFormatError(),
2013 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2014 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2015 }
2016
2017 AnnotationCollector::ID
2018 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2019 const Symbol* name) {
2020 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2021 // Privileged code can use all annotations. Other code silently drops some.
2022 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2023 loader_data->is_platform_class_loader_data() ||
2024 loader_data->is_anonymous();
2025 switch (sid) {
2026 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2027 if (_location != _in_method) break; // only allow for methods
2028 if (!privileged) break; // only allow in privileged code
2029 return _method_CallerSensitive;
2030 }
2031 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2032 if (_location != _in_method) break; // only allow for methods
2033 if (!privileged) break; // only allow in privileged code
2034 return _method_ForceInline;
2035 }
2036 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2037 if (_location != _in_method) break; // only allow for methods
2038 if (!privileged) break; // only allow in privileged code
2039 return _method_DontInline;
2040 }
2041 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2042 if (_location != _in_method) break; // only allow for methods
2043 if (!privileged) break; // only allow in privileged code
2044 return _method_InjectedProfile;
2045 }
2046 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2047 if (_location != _in_method) break; // only allow for methods
2048 if (!privileged) break; // only allow in privileged code
2049 return _method_LambdaForm_Compiled;
2050 }
2051 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): {
2052 if (_location != _in_method) break; // only allow for methods
2053 if (!privileged) break; // only allow in privileged code
2054 return _method_LambdaForm_Hidden;
2055 }
2056 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2057 if (_location != _in_method) break; // only allow for methods
2058 if (!privileged) break; // only allow in privileged code
2059 return _method_HotSpotIntrinsicCandidate;
2060 }
2061 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2062 if (_location != _in_field) break; // only allow for fields
2063 if (!privileged) break; // only allow in privileged code
2064 return _field_Stable;
2065 }
2066 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2067 if (_location != _in_field && _location != _in_class) {
2068 break; // only allow for fields and classes
2069 }
2070 if (!EnableContended || (RestrictContended && !privileged)) {
2071 break; // honor privileges
2072 }
2073 return _jdk_internal_vm_annotation_Contended;
2074 }
2075 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2076 if (_location != _in_method) break; // only allow for methods
2077 if (RestrictReservedStack && !privileged) break; // honor privileges
2078 return _jdk_internal_vm_annotation_ReservedStackAccess;
2079 }
2080 default: {
2081 break;
2082 }
2083 }
2084 return AnnotationCollector::_unknown;
2085 }
2086
2087 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2088 if (is_contended())
2089 f->set_contended_group(contended_group());
2090 if (is_stable())
2091 f->set_stable(true);
2092 }
2093
2094 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2095 // If there's an error deallocate metadata for field annotations
2096 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2097 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2098 }
2099
2100 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2101 if (has_annotation(_method_CallerSensitive))
2102 m->set_caller_sensitive(true);
2103 if (has_annotation(_method_ForceInline))
2104 m->set_force_inline(true);
2105 if (has_annotation(_method_DontInline))
2106 m->set_dont_inline(true);
2107 if (has_annotation(_method_InjectedProfile))
2108 m->set_has_injected_profile(true);
2109 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2110 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2111 if (has_annotation(_method_LambdaForm_Hidden))
2112 m->set_hidden(true);
2113 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2114 m->set_intrinsic_candidate(true);
2115 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2116 m->set_has_reserved_stack_access(true);
2117 }
2118
2119 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2120 assert(ik != NULL, "invariant");
2121 ik->set_is_contended(is_contended());
2122 }
2123
2124 #define MAX_ARGS_SIZE 255
2125 #define MAX_CODE_SIZE 65535
2126 #define INITIAL_MAX_LVT_NUMBER 256
2127
2128 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2129 *
2130 * Rules for LVT's and LVTT's are:
2131 * - There can be any number of LVT's and LVTT's.
2132 * - If there are n LVT's, it is the same as if there was just
2133 * one LVT containing all the entries from the n LVT's.
2134 * - There may be no more than one LVT entry per local variable.
2135 * Two LVT entries are 'equal' if these fields are the same:
2136 * start_pc, length, name, slot
2137 * - There may be no more than one LVTT entry per each LVT entry.
2138 * Each LVTT entry has to match some LVT entry.
2139 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2140 */
2141 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2142 int lvt_cnt,
2143 u2* const localvariable_table_length,
2144 const unsafe_u2** const localvariable_table_start,
2145 int lvtt_cnt,
2146 u2* const localvariable_type_table_length,
2147 const unsafe_u2** const localvariable_type_table_start,
2148 TRAPS) {
2149
2150 ResourceMark rm(THREAD);
2151
2152 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2153 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2154
2155 LVT_HashTable* const table = new LVT_HashTable();
2156
2157 // To fill LocalVariableTable in
2158 const Classfile_LVT_Element* cf_lvt;
2159 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2160
2161 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2162 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2163 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2164 copy_lvt_element(&cf_lvt[idx], lvt);
2165 // If no duplicates, add LVT elem in hashtable.
2166 if (table->put(*lvt, lvt) == false
2167 && _need_verify
2168 && _major_version >= JAVA_1_5_VERSION) {
2169 classfile_parse_error("Duplicated LocalVariableTable attribute "
2170 "entry for '%s' in class file %s",
2171 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2172 CHECK);
2173 }
2174 }
2175 }
2176
2177 // To merge LocalVariableTable and LocalVariableTypeTable
2178 const Classfile_LVT_Element* cf_lvtt;
2179 LocalVariableTableElement lvtt_elem;
2180
2181 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2182 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2183 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2184 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2185 LocalVariableTableElement** entry = table->get(lvtt_elem);
2186 if (entry == NULL) {
2187 if (_need_verify) {
2188 classfile_parse_error("LVTT entry for '%s' in class file %s "
2189 "does not match any LVT entry",
2190 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2191 CHECK);
2192 }
2193 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2194 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2195 "entry for '%s' in class file %s",
2196 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2197 CHECK);
2198 } else {
2199 // to add generic signatures into LocalVariableTable
2200 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2201 }
2202 }
2203 }
2204 }
2205
2206
2207 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2208 const u1* runtime_visible_annotations,
2209 int runtime_visible_annotations_length,
2210 const u1* runtime_invisible_annotations,
2211 int runtime_invisible_annotations_length,
2212 const u1* runtime_visible_parameter_annotations,
2213 int runtime_visible_parameter_annotations_length,
2214 const u1* runtime_invisible_parameter_annotations,
2215 int runtime_invisible_parameter_annotations_length,
2216 const u1* runtime_visible_type_annotations,
2217 int runtime_visible_type_annotations_length,
2218 const u1* runtime_invisible_type_annotations,
2219 int runtime_invisible_type_annotations_length,
2220 const u1* annotation_default,
2221 int annotation_default_length,
2222 TRAPS) {
2223
2224 AnnotationArray* a;
2225
2226 if (runtime_visible_annotations_length +
2227 runtime_invisible_annotations_length > 0) {
2228 a = assemble_annotations(runtime_visible_annotations,
2229 runtime_visible_annotations_length,
2230 runtime_invisible_annotations,
2231 runtime_invisible_annotations_length,
2232 CHECK);
2233 cm->set_method_annotations(a);
2234 }
2235
2236 if (runtime_visible_parameter_annotations_length +
2237 runtime_invisible_parameter_annotations_length > 0) {
2238 a = assemble_annotations(runtime_visible_parameter_annotations,
2239 runtime_visible_parameter_annotations_length,
2240 runtime_invisible_parameter_annotations,
2241 runtime_invisible_parameter_annotations_length,
2242 CHECK);
2243 cm->set_parameter_annotations(a);
2244 }
2245
2246 if (annotation_default_length > 0) {
2247 a = assemble_annotations(annotation_default,
2248 annotation_default_length,
2249 NULL,
2250 0,
2251 CHECK);
2252 cm->set_default_annotations(a);
2253 }
2254
2255 if (runtime_visible_type_annotations_length +
2256 runtime_invisible_type_annotations_length > 0) {
2257 a = assemble_annotations(runtime_visible_type_annotations,
2258 runtime_visible_type_annotations_length,
2259 runtime_invisible_type_annotations,
2260 runtime_invisible_type_annotations_length,
2261 CHECK);
2262 cm->set_type_annotations(a);
2263 }
2264 }
2265
2266
2267 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2268 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2269 // Method* to save footprint, so we only know the size of the resulting Method* when the
2270 // entire method attribute is parsed.
2271 //
2272 // The promoted_flags parameter is used to pass relevant access_flags
2273 // from the method back up to the containing klass. These flag values
2274 // are added to klass's access_flags.
2275
2276 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2277 bool is_interface,
2278 const ConstantPool* cp,
2279 AccessFlags* const promoted_flags,
2280 TRAPS) {
2281 assert(cfs != NULL, "invariant");
2282 assert(cp != NULL, "invariant");
2283 assert(promoted_flags != NULL, "invariant");
2284
2285 ResourceMark rm(THREAD);
2286 // Parse fixed parts:
2287 // access_flags, name_index, descriptor_index, attributes_count
2288 cfs->guarantee_more(8, CHECK_NULL);
2289
2290 int flags = cfs->get_u2_fast();
2291 const u2 name_index = cfs->get_u2_fast();
2292 const int cp_size = cp->length();
2293 check_property(
2294 valid_symbol_at(name_index),
2295 "Illegal constant pool index %u for method name in class file %s",
2296 name_index, CHECK_NULL);
2297 const Symbol* const name = cp->symbol_at(name_index);
2298 verify_legal_method_name(name, CHECK_NULL);
2299
2300 const u2 signature_index = cfs->get_u2_fast();
2301 guarantee_property(
2302 valid_symbol_at(signature_index),
2303 "Illegal constant pool index %u for method signature in class file %s",
2304 signature_index, CHECK_NULL);
2305 const Symbol* const signature = cp->symbol_at(signature_index);
2306
2307 if (name == vmSymbols::class_initializer_name()) {
2308 // We ignore the other access flags for a valid class initializer.
2309 // (JVM Spec 2nd ed., chapter 4.6)
2310 if (_major_version < 51) { // backward compatibility
2311 flags = JVM_ACC_STATIC;
2312 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2313 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2314 } else {
2315 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2316 }
2317 } else {
2318 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2319 }
2320
2321 if (name == vmSymbols::object_initializer_name() && is_interface) {
2322 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2323 }
2324
2325 int args_size = -1; // only used when _need_verify is true
2326 if (_need_verify) {
2327 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2328 verify_legal_method_signature(name, signature, CHECK_NULL);
2329 if (args_size > MAX_ARGS_SIZE) {
2330 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2331 }
2332 }
2333
2334 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2335
2336 // Default values for code and exceptions attribute elements
2337 u2 max_stack = 0;
2338 u2 max_locals = 0;
2339 u4 code_length = 0;
2340 const u1* code_start = 0;
2341 u2 exception_table_length = 0;
2342 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2343 Array<int>* exception_handlers = Universe::the_empty_int_array();
2344 u2 checked_exceptions_length = 0;
2345 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2346 CompressedLineNumberWriteStream* linenumber_table = NULL;
2347 int linenumber_table_length = 0;
2348 int total_lvt_length = 0;
2349 u2 lvt_cnt = 0;
2350 u2 lvtt_cnt = 0;
2351 bool lvt_allocated = false;
2352 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2353 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2354 u2* localvariable_table_length = NULL;
2355 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2356 u2* localvariable_type_table_length = NULL;
2357 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2358 int method_parameters_length = -1;
2359 const u1* method_parameters_data = NULL;
2360 bool method_parameters_seen = false;
2361 bool parsed_code_attribute = false;
2362 bool parsed_checked_exceptions_attribute = false;
2363 bool parsed_stackmap_attribute = false;
2364 // stackmap attribute - JDK1.5
2365 const u1* stackmap_data = NULL;
2366 int stackmap_data_length = 0;
2367 u2 generic_signature_index = 0;
2368 MethodAnnotationCollector parsed_annotations;
2369 const u1* runtime_visible_annotations = NULL;
2370 int runtime_visible_annotations_length = 0;
2371 const u1* runtime_invisible_annotations = NULL;
2372 int runtime_invisible_annotations_length = 0;
2373 const u1* runtime_visible_parameter_annotations = NULL;
2374 int runtime_visible_parameter_annotations_length = 0;
2375 const u1* runtime_invisible_parameter_annotations = NULL;
2376 int runtime_invisible_parameter_annotations_length = 0;
2377 const u1* runtime_visible_type_annotations = NULL;
2378 int runtime_visible_type_annotations_length = 0;
2379 const u1* runtime_invisible_type_annotations = NULL;
2380 int runtime_invisible_type_annotations_length = 0;
2381 bool runtime_invisible_annotations_exists = false;
2382 bool runtime_invisible_type_annotations_exists = false;
2383 bool runtime_invisible_parameter_annotations_exists = false;
2384 const u1* annotation_default = NULL;
2385 int annotation_default_length = 0;
2386
2387 // Parse code and exceptions attribute
2388 u2 method_attributes_count = cfs->get_u2_fast();
2389 while (method_attributes_count--) {
2390 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2391 const u2 method_attribute_name_index = cfs->get_u2_fast();
2392 const u4 method_attribute_length = cfs->get_u4_fast();
2393 check_property(
2394 valid_symbol_at(method_attribute_name_index),
2395 "Invalid method attribute name index %u in class file %s",
2396 method_attribute_name_index, CHECK_NULL);
2397
2398 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2399 if (method_attribute_name == vmSymbols::tag_code()) {
2400 // Parse Code attribute
2401 if (_need_verify) {
2402 guarantee_property(
2403 !access_flags.is_native() && !access_flags.is_abstract(),
2404 "Code attribute in native or abstract methods in class file %s",
2405 CHECK_NULL);
2406 }
2407 if (parsed_code_attribute) {
2408 classfile_parse_error("Multiple Code attributes in class file %s",
2409 CHECK_NULL);
2410 }
2411 parsed_code_attribute = true;
2412
2413 // Stack size, locals size, and code size
2414 if (_major_version == 45 && _minor_version <= 2) {
2415 cfs->guarantee_more(4, CHECK_NULL);
2416 max_stack = cfs->get_u1_fast();
2417 max_locals = cfs->get_u1_fast();
2418 code_length = cfs->get_u2_fast();
2419 } else {
2420 cfs->guarantee_more(8, CHECK_NULL);
2421 max_stack = cfs->get_u2_fast();
2422 max_locals = cfs->get_u2_fast();
2423 code_length = cfs->get_u4_fast();
2424 }
2425 if (_need_verify) {
2426 guarantee_property(args_size <= max_locals,
2427 "Arguments can't fit into locals in class file %s",
2428 CHECK_NULL);
2429 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2430 "Invalid method Code length %u in class file %s",
2431 code_length, CHECK_NULL);
2432 }
2433 // Code pointer
2434 code_start = cfs->current();
2435 assert(code_start != NULL, "null code start");
2436 cfs->guarantee_more(code_length, CHECK_NULL);
2437 cfs->skip_u1_fast(code_length);
2438
2439 // Exception handler table
2440 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2441 exception_table_length = cfs->get_u2_fast();
2442 if (exception_table_length > 0) {
2443 exception_table_start = parse_exception_table(cfs,
2444 code_length,
2445 exception_table_length,
2446 CHECK_NULL);
2447 }
2448
2449 // Parse additional attributes in code attribute
2450 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2451 u2 code_attributes_count = cfs->get_u2_fast();
2452
2453 unsigned int calculated_attribute_length = 0;
2454
2455 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2456 calculated_attribute_length =
2457 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2458 } else {
2459 // max_stack, locals and length are smaller in pre-version 45.2 classes
2460 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2461 }
2462 calculated_attribute_length +=
2463 code_length +
2464 sizeof(exception_table_length) +
2465 sizeof(code_attributes_count) +
2466 exception_table_length *
2467 ( sizeof(u2) + // start_pc
2468 sizeof(u2) + // end_pc
2469 sizeof(u2) + // handler_pc
2470 sizeof(u2) ); // catch_type_index
2471
2472 while (code_attributes_count--) {
2473 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2474 const u2 code_attribute_name_index = cfs->get_u2_fast();
2475 const u4 code_attribute_length = cfs->get_u4_fast();
2476 calculated_attribute_length += code_attribute_length +
2477 sizeof(code_attribute_name_index) +
2478 sizeof(code_attribute_length);
2479 check_property(valid_symbol_at(code_attribute_name_index),
2480 "Invalid code attribute name index %u in class file %s",
2481 code_attribute_name_index,
2482 CHECK_NULL);
2483 if (LoadLineNumberTables &&
2484 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2485 // Parse and compress line number table
2486 parse_linenumber_table(code_attribute_length,
2487 code_length,
2488 &linenumber_table,
2489 CHECK_NULL);
2490
2491 } else if (LoadLocalVariableTables &&
2492 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2493 // Parse local variable table
2494 if (!lvt_allocated) {
2495 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2496 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2497 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2498 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2499 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2500 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2501 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2502 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2503 lvt_allocated = true;
2504 }
2505 if (lvt_cnt == max_lvt_cnt) {
2506 max_lvt_cnt <<= 1;
2507 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2508 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2509 }
2510 localvariable_table_start[lvt_cnt] =
2511 parse_localvariable_table(cfs,
2512 code_length,
2513 max_locals,
2514 code_attribute_length,
2515 &localvariable_table_length[lvt_cnt],
2516 false, // is not LVTT
2517 CHECK_NULL);
2518 total_lvt_length += localvariable_table_length[lvt_cnt];
2519 lvt_cnt++;
2520 } else if (LoadLocalVariableTypeTables &&
2521 _major_version >= JAVA_1_5_VERSION &&
2522 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2523 if (!lvt_allocated) {
2524 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2525 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2526 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2527 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2528 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2529 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2530 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2531 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2532 lvt_allocated = true;
2533 }
2534 // Parse local variable type table
2535 if (lvtt_cnt == max_lvtt_cnt) {
2536 max_lvtt_cnt <<= 1;
2537 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2538 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2539 }
2540 localvariable_type_table_start[lvtt_cnt] =
2541 parse_localvariable_table(cfs,
2542 code_length,
2543 max_locals,
2544 code_attribute_length,
2545 &localvariable_type_table_length[lvtt_cnt],
2546 true, // is LVTT
2547 CHECK_NULL);
2548 lvtt_cnt++;
2549 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2550 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2551 // Stack map is only needed by the new verifier in JDK1.5.
2552 if (parsed_stackmap_attribute) {
2553 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2554 }
2555 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2556 stackmap_data_length = code_attribute_length;
2557 parsed_stackmap_attribute = true;
2558 } else {
2559 // Skip unknown attributes
2560 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2561 }
2562 }
2563 // check method attribute length
2564 if (_need_verify) {
2565 guarantee_property(method_attribute_length == calculated_attribute_length,
2566 "Code segment has wrong length in class file %s",
2567 CHECK_NULL);
2568 }
2569 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2570 // Parse Exceptions attribute
2571 if (parsed_checked_exceptions_attribute) {
2572 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2573 CHECK_NULL);
2574 }
2575 parsed_checked_exceptions_attribute = true;
2576 checked_exceptions_start =
2577 parse_checked_exceptions(cfs,
2578 &checked_exceptions_length,
2579 method_attribute_length,
2580 CHECK_NULL);
2581 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2582 // reject multiple method parameters
2583 if (method_parameters_seen) {
2584 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2585 CHECK_NULL);
2586 }
2587 method_parameters_seen = true;
2588 method_parameters_length = cfs->get_u1_fast();
2589 const u2 real_length = (method_parameters_length * 4u) + 1u;
2590 if (method_attribute_length != real_length) {
2591 classfile_parse_error(
2592 "Invalid MethodParameters method attribute length %u in class file",
2593 method_attribute_length, CHECK_NULL);
2594 }
2595 method_parameters_data = cfs->current();
2596 cfs->skip_u2_fast(method_parameters_length);
2597 cfs->skip_u2_fast(method_parameters_length);
2598 // ignore this attribute if it cannot be reflected
2599 if (!SystemDictionary::Parameter_klass_loaded())
2600 method_parameters_length = -1;
2601 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2602 if (method_attribute_length != 0) {
2603 classfile_parse_error(
2604 "Invalid Synthetic method attribute length %u in class file %s",
2605 method_attribute_length, CHECK_NULL);
2606 }
2607 // Should we check that there hasn't already been a synthetic attribute?
2608 access_flags.set_is_synthetic();
2609 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2610 if (method_attribute_length != 0) {
2611 classfile_parse_error(
2612 "Invalid Deprecated method attribute length %u in class file %s",
2613 method_attribute_length, CHECK_NULL);
2614 }
2615 } else if (_major_version >= JAVA_1_5_VERSION) {
2616 if (method_attribute_name == vmSymbols::tag_signature()) {
2617 if (generic_signature_index != 0) {
2618 classfile_parse_error(
2619 "Multiple Signature attributes for method in class file %s",
2620 CHECK_NULL);
2621 }
2622 if (method_attribute_length != 2) {
2623 classfile_parse_error(
2624 "Invalid Signature attribute length %u in class file %s",
2625 method_attribute_length, CHECK_NULL);
2626 }
2627 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2628 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2629 if (runtime_visible_annotations != NULL) {
2630 classfile_parse_error(
2631 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2632 CHECK_NULL);
2633 }
2634 runtime_visible_annotations_length = method_attribute_length;
2635 runtime_visible_annotations = cfs->current();
2636 assert(runtime_visible_annotations != NULL, "null visible annotations");
2637 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2638 parse_annotations(cp,
2639 runtime_visible_annotations,
2640 runtime_visible_annotations_length,
2641 &parsed_annotations,
2642 _loader_data,
2643 CHECK_NULL);
2644 cfs->skip_u1_fast(runtime_visible_annotations_length);
2645 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2646 if (runtime_invisible_annotations_exists) {
2647 classfile_parse_error(
2648 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2649 CHECK_NULL);
2650 }
2651 runtime_invisible_annotations_exists = true;
2652 if (PreserveAllAnnotations) {
2653 runtime_invisible_annotations_length = method_attribute_length;
2654 runtime_invisible_annotations = cfs->current();
2655 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2656 }
2657 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2658 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2659 if (runtime_visible_parameter_annotations != NULL) {
2660 classfile_parse_error(
2661 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2662 CHECK_NULL);
2663 }
2664 runtime_visible_parameter_annotations_length = method_attribute_length;
2665 runtime_visible_parameter_annotations = cfs->current();
2666 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2667 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2668 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2669 if (runtime_invisible_parameter_annotations_exists) {
2670 classfile_parse_error(
2671 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2672 CHECK_NULL);
2673 }
2674 runtime_invisible_parameter_annotations_exists = true;
2675 if (PreserveAllAnnotations) {
2676 runtime_invisible_parameter_annotations_length = method_attribute_length;
2677 runtime_invisible_parameter_annotations = cfs->current();
2678 assert(runtime_invisible_parameter_annotations != NULL,
2679 "null invisible parameter annotations");
2680 }
2681 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2682 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2683 if (annotation_default != NULL) {
2684 classfile_parse_error(
2685 "Multiple AnnotationDefault attributes for method in class file %s",
2686 CHECK_NULL);
2687 }
2688 annotation_default_length = method_attribute_length;
2689 annotation_default = cfs->current();
2690 assert(annotation_default != NULL, "null annotation default");
2691 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2692 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2693 if (runtime_visible_type_annotations != NULL) {
2694 classfile_parse_error(
2695 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2696 CHECK_NULL);
2697 }
2698 runtime_visible_type_annotations_length = method_attribute_length;
2699 runtime_visible_type_annotations = cfs->current();
2700 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2701 // No need for the VM to parse Type annotations
2702 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2703 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2704 if (runtime_invisible_type_annotations_exists) {
2705 classfile_parse_error(
2706 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2707 CHECK_NULL);
2708 } else {
2709 runtime_invisible_type_annotations_exists = true;
2710 }
2711 if (PreserveAllAnnotations) {
2712 runtime_invisible_type_annotations_length = method_attribute_length;
2713 runtime_invisible_type_annotations = cfs->current();
2714 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2715 }
2716 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2717 } else {
2718 // Skip unknown attributes
2719 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2720 }
2721 } else {
2722 // Skip unknown attributes
2723 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2724 }
2725 }
2726
2727 if (linenumber_table != NULL) {
2728 linenumber_table->write_terminator();
2729 linenumber_table_length = linenumber_table->position();
2730 }
2731
2732 // Make sure there's at least one Code attribute in non-native/non-abstract method
2733 if (_need_verify) {
2734 guarantee_property(access_flags.is_native() ||
2735 access_flags.is_abstract() ||
2736 parsed_code_attribute,
2737 "Absent Code attribute in method that is not native or abstract in class file %s",
2738 CHECK_NULL);
2739 }
2740
2741 // All sizing information for a Method* is finally available, now create it
2742 InlineTableSizes sizes(
2743 total_lvt_length,
2744 linenumber_table_length,
2745 exception_table_length,
2746 checked_exceptions_length,
2747 method_parameters_length,
2748 generic_signature_index,
2749 runtime_visible_annotations_length +
2750 runtime_invisible_annotations_length,
2751 runtime_visible_parameter_annotations_length +
2752 runtime_invisible_parameter_annotations_length,
2753 runtime_visible_type_annotations_length +
2754 runtime_invisible_type_annotations_length,
2755 annotation_default_length,
2756 0);
2757
2758 Method* const m = Method::allocate(_loader_data,
2759 code_length,
2760 access_flags,
2761 &sizes,
2762 ConstMethod::NORMAL,
2763 CHECK_NULL);
2764
2765 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2766
2767 // Fill in information from fixed part (access_flags already set)
2768 m->set_constants(_cp);
2769 m->set_name_index(name_index);
2770 m->set_signature_index(signature_index);
2771
2772 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2773 m->constMethod()->set_result_type(rtf.type());
2774
2775 if (args_size >= 0) {
2776 m->set_size_of_parameters(args_size);
2777 } else {
2778 m->compute_size_of_parameters(THREAD);
2779 }
2780 #ifdef ASSERT
2781 if (args_size >= 0) {
2782 m->compute_size_of_parameters(THREAD);
2783 assert(args_size == m->size_of_parameters(), "");
2784 }
2785 #endif
2786
2787 // Fill in code attribute information
2788 m->set_max_stack(max_stack);
2789 m->set_max_locals(max_locals);
2790 if (stackmap_data != NULL) {
2791 m->constMethod()->copy_stackmap_data(_loader_data,
2792 (u1*)stackmap_data,
2793 stackmap_data_length,
2794 CHECK_NULL);
2795 }
2796
2797 // Copy byte codes
2798 m->set_code((u1*)code_start);
2799
2800 // Copy line number table
2801 if (linenumber_table != NULL) {
2802 memcpy(m->compressed_linenumber_table(),
2803 linenumber_table->buffer(),
2804 linenumber_table_length);
2805 }
2806
2807 // Copy exception table
2808 if (exception_table_length > 0) {
2809 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2810 m->exception_table_start(),
2811 exception_table_length * sizeof(ExceptionTableElement),
2812 sizeof(u2));
2813 }
2814
2815 // Copy method parameters
2816 if (method_parameters_length > 0) {
2817 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2818 for (int i = 0; i < method_parameters_length; i++) {
2819 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2820 method_parameters_data += 2;
2821 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2822 method_parameters_data += 2;
2823 }
2824 }
2825
2826 // Copy checked exceptions
2827 if (checked_exceptions_length > 0) {
2828 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2829 m->checked_exceptions_start(),
2830 checked_exceptions_length * sizeof(CheckedExceptionElement),
2831 sizeof(u2));
2832 }
2833
2834 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2835 if (total_lvt_length > 0) {
2836 promoted_flags->set_has_localvariable_table();
2837 copy_localvariable_table(m->constMethod(),
2838 lvt_cnt,
2839 localvariable_table_length,
2840 localvariable_table_start,
2841 lvtt_cnt,
2842 localvariable_type_table_length,
2843 localvariable_type_table_start,
2844 CHECK_NULL);
2845 }
2846
2847 if (parsed_annotations.has_any_annotations())
2848 parsed_annotations.apply_to(m);
2849
2850 // Copy annotations
2851 copy_method_annotations(m->constMethod(),
2852 runtime_visible_annotations,
2853 runtime_visible_annotations_length,
2854 runtime_invisible_annotations,
2855 runtime_invisible_annotations_length,
2856 runtime_visible_parameter_annotations,
2857 runtime_visible_parameter_annotations_length,
2858 runtime_invisible_parameter_annotations,
2859 runtime_invisible_parameter_annotations_length,
2860 runtime_visible_type_annotations,
2861 runtime_visible_type_annotations_length,
2862 runtime_invisible_type_annotations,
2863 runtime_invisible_type_annotations_length,
2864 annotation_default,
2865 annotation_default_length,
2866 CHECK_NULL);
2867
2868 if (name == vmSymbols::finalize_method_name() &&
2869 signature == vmSymbols::void_method_signature()) {
2870 if (m->is_empty_method()) {
2871 _has_empty_finalizer = true;
2872 } else {
2873 _has_finalizer = true;
2874 }
2875 }
2876 if (name == vmSymbols::object_initializer_name() &&
2877 signature == vmSymbols::void_method_signature() &&
2878 m->is_vanilla_constructor()) {
2879 _has_vanilla_constructor = true;
2880 }
2881
2882 NOT_PRODUCT(m->verify());
2883 return m;
2884 }
2885
2886
2887 // The promoted_flags parameter is used to pass relevant access_flags
2888 // from the methods back up to the containing klass. These flag values
2889 // are added to klass's access_flags.
2890 // Side-effects: populates the _methods field in the parser
2891 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2892 bool is_interface,
2893 AccessFlags* promoted_flags,
2894 bool* has_final_method,
2895 bool* declares_nonstatic_concrete_methods,
2896 TRAPS) {
2897 assert(cfs != NULL, "invariant");
2898 assert(promoted_flags != NULL, "invariant");
2899 assert(has_final_method != NULL, "invariant");
2900 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2901
2902 assert(NULL == _methods, "invariant");
2903
2904 cfs->guarantee_more(2, CHECK); // length
2905 const u2 length = cfs->get_u2_fast();
2906 if (length == 0) {
2907 _methods = Universe::the_empty_method_array();
2908 } else {
2909 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2910 length,
2911 NULL,
2912 CHECK);
2913
2914 for (int index = 0; index < length; index++) {
2915 Method* method = parse_method(cfs,
2916 is_interface,
2917 _cp,
2918 promoted_flags,
2919 CHECK);
2920
2921 if (method->is_final()) {
2922 *has_final_method = true;
2923 }
2924 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2925 // used for interface initialization, and default method inheritance analysis
2926 if (is_interface && !(*declares_nonstatic_concrete_methods)
2927 && !method->is_abstract() && !method->is_static()) {
2928 *declares_nonstatic_concrete_methods = true;
2929 }
2930 _methods->at_put(index, method);
2931 }
2932
2933 if (_need_verify && length > 1) {
2934 // Check duplicated methods
2935 ResourceMark rm(THREAD);
2936 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2937 THREAD, NameSigHash*, HASH_ROW_SIZE);
2938 initialize_hashtable(names_and_sigs);
2939 bool dup = false;
2940 const Symbol* name = NULL;
2941 const Symbol* sig = NULL;
2942 {
2943 debug_only(NoSafepointVerifier nsv;)
2944 for (int i = 0; i < length; i++) {
2945 const Method* const m = _methods->at(i);
2946 name = m->name();
2947 sig = m->signature();
2948 // If no duplicates, add name/signature in hashtable names_and_sigs.
2949 if (!put_after_lookup(name, sig, names_and_sigs)) {
2950 dup = true;
2951 break;
2952 }
2953 }
2954 }
2955 if (dup) {
2956 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2957 name->as_C_string(), sig->as_klass_external_name(), CHECK);
2958 }
2959 }
2960 }
2961 }
2962
2963 static const intArray* sort_methods(Array<Method*>* methods) {
2964 const int length = methods->length();
2965 // If JVMTI original method ordering or sharing is enabled we have to
2966 // remember the original class file ordering.
2967 // We temporarily use the vtable_index field in the Method* to store the
2968 // class file index, so we can read in after calling qsort.
2969 // Put the method ordering in the shared archive.
2970 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2971 for (int index = 0; index < length; index++) {
2972 Method* const m = methods->at(index);
2973 assert(!m->valid_vtable_index(), "vtable index should not be set");
2974 m->set_vtable_index(index);
2975 }
2976 }
2977 // Sort method array by ascending method name (for faster lookups & vtable construction)
2978 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2979 Method::sort_methods(methods);
2980
2981 intArray* method_ordering = NULL;
2982 // If JVMTI original method ordering or sharing is enabled construct int
2983 // array remembering the original ordering
2984 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2985 method_ordering = new intArray(length, length, -1);
2986 for (int index = 0; index < length; index++) {
2987 Method* const m = methods->at(index);
2988 const int old_index = m->vtable_index();
2989 assert(old_index >= 0 && old_index < length, "invalid method index");
2990 method_ordering->at_put(index, old_index);
2991 m->set_vtable_index(Method::invalid_vtable_index);
2992 }
2993 }
2994 return method_ordering;
2995 }
2996
2997 // Parse generic_signature attribute for methods and fields
2998 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
2999 TRAPS) {
3000 assert(cfs != NULL, "invariant");
3001
3002 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3003 const u2 generic_signature_index = cfs->get_u2_fast();
3004 check_property(
3005 valid_symbol_at(generic_signature_index),
3006 "Invalid Signature attribute at constant pool index %u in class file %s",
3007 generic_signature_index, CHECK_0);
3008 return generic_signature_index;
3009 }
3010
3011 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3012 TRAPS) {
3013
3014 assert(cfs != NULL, "invariant");
3015
3016 cfs->guarantee_more(2, CHECK); // sourcefile_index
3017 const u2 sourcefile_index = cfs->get_u2_fast();
3018 check_property(
3019 valid_symbol_at(sourcefile_index),
3020 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3021 sourcefile_index, CHECK);
3022 set_class_sourcefile_index(sourcefile_index);
3023 }
3024
3025 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3026 int length,
3027 TRAPS) {
3028 assert(cfs != NULL, "invariant");
3029
3030 const u1* const sde_buffer = cfs->current();
3031 assert(sde_buffer != NULL, "null sde buffer");
3032
3033 // Don't bother storing it if there is no way to retrieve it
3034 if (JvmtiExport::can_get_source_debug_extension()) {
3035 assert((length+1) > length, "Overflow checking");
3036 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3037 for (int i = 0; i < length; i++) {
3038 sde[i] = sde_buffer[i];
3039 }
3040 sde[length] = '\0';
3041 set_class_sde_buffer((const char*)sde, length);
3042 }
3043 // Got utf8 string, set stream position forward
3044 cfs->skip_u1(length, CHECK);
3045 }
3046
3047
3048 // Inner classes can be static, private or protected (classic VM does this)
3049 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3050 JVM_ACC_PRIVATE | \
3051 JVM_ACC_PROTECTED | \
3052 JVM_ACC_STATIC \
3053 )
3054
3055 // Return number of classes in the inner classes attribute table
3056 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3057 const u1* const inner_classes_attribute_start,
3058 bool parsed_enclosingmethod_attribute,
3059 u2 enclosing_method_class_index,
3060 u2 enclosing_method_method_index,
3061 TRAPS) {
3062 const u1* const current_mark = cfs->current();
3063 u2 length = 0;
3064 if (inner_classes_attribute_start != NULL) {
3065 cfs->set_current(inner_classes_attribute_start);
3066 cfs->guarantee_more(2, CHECK_0); // length
3067 length = cfs->get_u2_fast();
3068 }
3069
3070 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3071 // method data:
3072 // [inner_class_info_index,
3073 // outer_class_info_index,
3074 // inner_name_index,
3075 // inner_class_access_flags,
3076 // ...
3077 // enclosing_method_class_index,
3078 // enclosing_method_method_index]
3079 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3080 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3081 _inner_classes = inner_classes;
3082
3083 int index = 0;
3084 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3085 for (int n = 0; n < length; n++) {
3086 // Inner class index
3087 const u2 inner_class_info_index = cfs->get_u2_fast();
3088 check_property(
3089 valid_klass_reference_at(inner_class_info_index),
3090 "inner_class_info_index %u has bad constant type in class file %s",
3091 inner_class_info_index, CHECK_0);
3092 // Outer class index
3093 const u2 outer_class_info_index = cfs->get_u2_fast();
3094 check_property(
3095 outer_class_info_index == 0 ||
3096 valid_klass_reference_at(outer_class_info_index),
3097 "outer_class_info_index %u has bad constant type in class file %s",
3098 outer_class_info_index, CHECK_0);
3099 // Inner class name
3100 const u2 inner_name_index = cfs->get_u2_fast();
3101 check_property(
3102 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3103 "inner_name_index %u has bad constant type in class file %s",
3104 inner_name_index, CHECK_0);
3105 if (_need_verify) {
3106 guarantee_property(inner_class_info_index != outer_class_info_index,
3107 "Class is both outer and inner class in class file %s", CHECK_0);
3108 }
3109 // Access flags
3110 jint flags;
3111 // JVM_ACC_MODULE is defined in JDK-9 and later.
3112 if (_major_version >= JAVA_9_VERSION) {
3113 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3114 } else {
3115 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3116 }
3117 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3118 // Set abstract bit for old class files for backward compatibility
3119 flags |= JVM_ACC_ABSTRACT;
3120 }
3121 verify_legal_class_modifiers(flags, CHECK_0);
3122 AccessFlags inner_access_flags(flags);
3123
3124 inner_classes->at_put(index++, inner_class_info_index);
3125 inner_classes->at_put(index++, outer_class_info_index);
3126 inner_classes->at_put(index++, inner_name_index);
3127 inner_classes->at_put(index++, inner_access_flags.as_short());
3128 }
3129
3130 // 4347400: make sure there's no duplicate entry in the classes array
3131 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3132 for(int i = 0; i < length * 4; i += 4) {
3133 for(int j = i + 4; j < length * 4; j += 4) {
3134 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3135 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3136 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3137 inner_classes->at(i+3) != inner_classes->at(j+3)),
3138 "Duplicate entry in InnerClasses in class file %s",
3139 CHECK_0);
3140 }
3141 }
3142 }
3143
3144 // Set EnclosingMethod class and method indexes.
3145 if (parsed_enclosingmethod_attribute) {
3146 inner_classes->at_put(index++, enclosing_method_class_index);
3147 inner_classes->at_put(index++, enclosing_method_method_index);
3148 }
3149 assert(index == size, "wrong size");
3150
3151 // Restore buffer's current position.
3152 cfs->set_current(current_mark);
3153
3154 return length;
3155 }
3156
3157 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3158 const u1* const nest_members_attribute_start,
3159 TRAPS) {
3160 const u1* const current_mark = cfs->current();
3161 u2 length = 0;
3162 if (nest_members_attribute_start != NULL) {
3163 cfs->set_current(nest_members_attribute_start);
3164 cfs->guarantee_more(2, CHECK_0); // length
3165 length = cfs->get_u2_fast();
3166 }
3167 const int size = length;
3168 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3169 _nest_members = nest_members;
3170
3171 int index = 0;
3172 cfs->guarantee_more(2 * length, CHECK_0);
3173 for (int n = 0; n < length; n++) {
3174 const u2 class_info_index = cfs->get_u2_fast();
3175 check_property(
3176 valid_klass_reference_at(class_info_index),
3177 "Nest member class_info_index %u has bad constant type in class file %s",
3178 class_info_index, CHECK_0);
3179 nest_members->at_put(index++, class_info_index);
3180 }
3181 assert(index == size, "wrong size");
3182
3183 // Restore buffer's current position.
3184 cfs->set_current(current_mark);
3185
3186 return length;
3187 }
3188
3189 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3190 set_class_synthetic_flag(true);
3191 }
3192
3193 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3194 assert(cfs != NULL, "invariant");
3195
3196 const u2 signature_index = cfs->get_u2(CHECK);
3197 check_property(
3198 valid_symbol_at(signature_index),
3199 "Invalid constant pool index %u in Signature attribute in class file %s",
3200 signature_index, CHECK);
3201 set_class_generic_signature_index(signature_index);
3202 }
3203
3204 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3205 ConstantPool* cp,
3206 u4 attribute_byte_length,
3207 TRAPS) {
3208 assert(cfs != NULL, "invariant");
3209 assert(cp != NULL, "invariant");
3210
3211 const u1* const current_start = cfs->current();
3212
3213 guarantee_property(attribute_byte_length >= sizeof(u2),
3214 "Invalid BootstrapMethods attribute length %u in class file %s",
3215 attribute_byte_length,
3216 CHECK);
3217
3218 cfs->guarantee_more(attribute_byte_length, CHECK);
3219
3220 const int attribute_array_length = cfs->get_u2_fast();
3221
3222 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3223 "Short length on BootstrapMethods in class file %s",
3224 CHECK);
3225
3226
3227 // The attribute contains a counted array of counted tuples of shorts,
3228 // represending bootstrap specifiers:
3229 // length*{bootstrap_method_index, argument_count*{argument_index}}
3230 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3231 // operand_count = number of shorts in attr, except for leading length
3232
3233 // The attribute is copied into a short[] array.
3234 // The array begins with a series of short[2] pairs, one for each tuple.
3235 const int index_size = (attribute_array_length * 2);
3236
3237 Array<u2>* const operands =
3238 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3239
3240 // Eagerly assign operands so they will be deallocated with the constant
3241 // pool if there is an error.
3242 cp->set_operands(operands);
3243
3244 int operand_fill_index = index_size;
3245 const int cp_size = cp->length();
3246
3247 for (int n = 0; n < attribute_array_length; n++) {
3248 // Store a 32-bit offset into the header of the operand array.
3249 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3250
3251 // Read a bootstrap specifier.
3252 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3253 const u2 bootstrap_method_index = cfs->get_u2_fast();
3254 const u2 argument_count = cfs->get_u2_fast();
3255 check_property(
3256 valid_cp_range(bootstrap_method_index, cp_size) &&
3257 cp->tag_at(bootstrap_method_index).is_method_handle(),
3258 "bootstrap_method_index %u has bad constant type in class file %s",
3259 bootstrap_method_index,
3260 CHECK);
3261
3262 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3263 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3264 CHECK);
3265
3266 operands->at_put(operand_fill_index++, bootstrap_method_index);
3267 operands->at_put(operand_fill_index++, argument_count);
3268
3269 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3270 for (int j = 0; j < argument_count; j++) {
3271 const u2 argument_index = cfs->get_u2_fast();
3272 check_property(
3273 valid_cp_range(argument_index, cp_size) &&
3274 cp->tag_at(argument_index).is_loadable_constant(),
3275 "argument_index %u has bad constant type in class file %s",
3276 argument_index,
3277 CHECK);
3278 operands->at_put(operand_fill_index++, argument_index);
3279 }
3280 }
3281 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3282 "Bad length on BootstrapMethods in class file %s",
3283 CHECK);
3284 }
3285
3286 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3287 ConstantPool* cp,
3288 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3289 TRAPS) {
3290 assert(cfs != NULL, "invariant");
3291 assert(cp != NULL, "invariant");
3292 assert(parsed_annotations != NULL, "invariant");
3293
3294 // Set inner classes attribute to default sentinel
3295 _inner_classes = Universe::the_empty_short_array();
3296 // Set nest members attribute to default sentinel
3297 _nest_members = Universe::the_empty_short_array();
3298 cfs->guarantee_more(2, CHECK); // attributes_count
3299 u2 attributes_count = cfs->get_u2_fast();
3300 bool parsed_sourcefile_attribute = false;
3301 bool parsed_innerclasses_attribute = false;
3302 bool parsed_nest_members_attribute = false;
3303 bool parsed_nest_host_attribute = false;
3304 bool parsed_enclosingmethod_attribute = false;
3305 bool parsed_bootstrap_methods_attribute = false;
3306 const u1* runtime_visible_annotations = NULL;
3307 int runtime_visible_annotations_length = 0;
3308 const u1* runtime_invisible_annotations = NULL;
3309 int runtime_invisible_annotations_length = 0;
3310 const u1* runtime_visible_type_annotations = NULL;
3311 int runtime_visible_type_annotations_length = 0;
3312 const u1* runtime_invisible_type_annotations = NULL;
3313 int runtime_invisible_type_annotations_length = 0;
3314 bool runtime_invisible_type_annotations_exists = false;
3315 bool runtime_invisible_annotations_exists = false;
3316 bool parsed_source_debug_ext_annotations_exist = false;
3317 const u1* inner_classes_attribute_start = NULL;
3318 u4 inner_classes_attribute_length = 0;
3319 u2 enclosing_method_class_index = 0;
3320 u2 enclosing_method_method_index = 0;
3321 const u1* nest_members_attribute_start = NULL;
3322 u4 nest_members_attribute_length = 0;
3323
3324 // Iterate over attributes
3325 while (attributes_count--) {
3326 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3327 const u2 attribute_name_index = cfs->get_u2_fast();
3328 const u4 attribute_length = cfs->get_u4_fast();
3329 check_property(
3330 valid_symbol_at(attribute_name_index),
3331 "Attribute name has bad constant pool index %u in class file %s",
3332 attribute_name_index, CHECK);
3333 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3334 if (tag == vmSymbols::tag_source_file()) {
3335 // Check for SourceFile tag
3336 if (_need_verify) {
3337 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3338 }
3339 if (parsed_sourcefile_attribute) {
3340 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3341 } else {
3342 parsed_sourcefile_attribute = true;
3343 }
3344 parse_classfile_sourcefile_attribute(cfs, CHECK);
3345 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3346 // Check for SourceDebugExtension tag
3347 if (parsed_source_debug_ext_annotations_exist) {
3348 classfile_parse_error(
3349 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3350 }
3351 parsed_source_debug_ext_annotations_exist = true;
3352 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3353 } else if (tag == vmSymbols::tag_inner_classes()) {
3354 // Check for InnerClasses tag
3355 if (parsed_innerclasses_attribute) {
3356 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3357 } else {
3358 parsed_innerclasses_attribute = true;
3359 }
3360 inner_classes_attribute_start = cfs->current();
3361 inner_classes_attribute_length = attribute_length;
3362 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3363 } else if (tag == vmSymbols::tag_synthetic()) {
3364 // Check for Synthetic tag
3365 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3366 if (attribute_length != 0) {
3367 classfile_parse_error(
3368 "Invalid Synthetic classfile attribute length %u in class file %s",
3369 attribute_length, CHECK);
3370 }
3371 parse_classfile_synthetic_attribute(CHECK);
3372 } else if (tag == vmSymbols::tag_deprecated()) {
3373 // Check for Deprecatd tag - 4276120
3374 if (attribute_length != 0) {
3375 classfile_parse_error(
3376 "Invalid Deprecated classfile attribute length %u in class file %s",
3377 attribute_length, CHECK);
3378 }
3379 } else if (_major_version >= JAVA_1_5_VERSION) {
3380 if (tag == vmSymbols::tag_signature()) {
3381 if (_generic_signature_index != 0) {
3382 classfile_parse_error(
3383 "Multiple Signature attributes in class file %s", CHECK);
3384 }
3385 if (attribute_length != 2) {
3386 classfile_parse_error(
3387 "Wrong Signature attribute length %u in class file %s",
3388 attribute_length, CHECK);
3389 }
3390 parse_classfile_signature_attribute(cfs, CHECK);
3391 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3392 if (runtime_visible_annotations != NULL) {
3393 classfile_parse_error(
3394 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3395 }
3396 runtime_visible_annotations_length = attribute_length;
3397 runtime_visible_annotations = cfs->current();
3398 assert(runtime_visible_annotations != NULL, "null visible annotations");
3399 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3400 parse_annotations(cp,
3401 runtime_visible_annotations,
3402 runtime_visible_annotations_length,
3403 parsed_annotations,
3404 _loader_data,
3405 CHECK);
3406 cfs->skip_u1_fast(runtime_visible_annotations_length);
3407 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3408 if (runtime_invisible_annotations_exists) {
3409 classfile_parse_error(
3410 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3411 }
3412 runtime_invisible_annotations_exists = true;
3413 if (PreserveAllAnnotations) {
3414 runtime_invisible_annotations_length = attribute_length;
3415 runtime_invisible_annotations = cfs->current();
3416 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3417 }
3418 cfs->skip_u1(attribute_length, CHECK);
3419 } else if (tag == vmSymbols::tag_enclosing_method()) {
3420 if (parsed_enclosingmethod_attribute) {
3421 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3422 } else {
3423 parsed_enclosingmethod_attribute = true;
3424 }
3425 guarantee_property(attribute_length == 4,
3426 "Wrong EnclosingMethod attribute length %u in class file %s",
3427 attribute_length, CHECK);
3428 cfs->guarantee_more(4, CHECK); // class_index, method_index
3429 enclosing_method_class_index = cfs->get_u2_fast();
3430 enclosing_method_method_index = cfs->get_u2_fast();
3431 if (enclosing_method_class_index == 0) {
3432 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3433 }
3434 // Validate the constant pool indices and types
3435 check_property(valid_klass_reference_at(enclosing_method_class_index),
3436 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3437 if (enclosing_method_method_index != 0 &&
3438 (!cp->is_within_bounds(enclosing_method_method_index) ||
3439 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3440 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3441 }
3442 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3443 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3444 if (parsed_bootstrap_methods_attribute) {
3445 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3446 }
3447 parsed_bootstrap_methods_attribute = true;
3448 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3449 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3450 if (runtime_visible_type_annotations != NULL) {
3451 classfile_parse_error(
3452 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3453 }
3454 runtime_visible_type_annotations_length = attribute_length;
3455 runtime_visible_type_annotations = cfs->current();
3456 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3457 // No need for the VM to parse Type annotations
3458 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3459 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3460 if (runtime_invisible_type_annotations_exists) {
3461 classfile_parse_error(
3462 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3463 } else {
3464 runtime_invisible_type_annotations_exists = true;
3465 }
3466 if (PreserveAllAnnotations) {
3467 runtime_invisible_type_annotations_length = attribute_length;
3468 runtime_invisible_type_annotations = cfs->current();
3469 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3470 }
3471 cfs->skip_u1(attribute_length, CHECK);
3472 } else if (_major_version >= JAVA_11_VERSION) {
3473 if (tag == vmSymbols::tag_nest_members()) {
3474 // Check for NestMembers tag
3475 if (parsed_nest_members_attribute) {
3476 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK);
3477 } else {
3478 parsed_nest_members_attribute = true;
3479 }
3480 if (parsed_nest_host_attribute) {
3481 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK);
3482 }
3483 nest_members_attribute_start = cfs->current();
3484 nest_members_attribute_length = attribute_length;
3485 cfs->skip_u1(nest_members_attribute_length, CHECK);
3486 } else if (tag == vmSymbols::tag_nest_host()) {
3487 if (parsed_nest_host_attribute) {
3488 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK);
3489 } else {
3490 parsed_nest_host_attribute = true;
3491 }
3492 if (parsed_nest_members_attribute) {
3493 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK);
3494 }
3495 if (_need_verify) {
3496 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3497 }
3498 cfs->guarantee_more(2, CHECK);
3499 u2 class_info_index = cfs->get_u2_fast();
3500 check_property(
3501 valid_klass_reference_at(class_info_index),
3502 "Nest-host class_info_index %u has bad constant type in class file %s",
3503 class_info_index, CHECK);
3504 _nest_host = class_info_index;
3505 }
3506 } else {
3507 // Unknown attribute
3508 cfs->skip_u1(attribute_length, CHECK);
3509 }
3510 } else {
3511 // Unknown attribute
3512 cfs->skip_u1(attribute_length, CHECK);
3513 }
3514 }
3515 _annotations = assemble_annotations(runtime_visible_annotations,
3516 runtime_visible_annotations_length,
3517 runtime_invisible_annotations,
3518 runtime_invisible_annotations_length,
3519 CHECK);
3520 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3521 runtime_visible_type_annotations_length,
3522 runtime_invisible_type_annotations,
3523 runtime_invisible_type_annotations_length,
3524 CHECK);
3525
3526 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3527 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3528 cfs,
3529 inner_classes_attribute_start,
3530 parsed_innerclasses_attribute,
3531 enclosing_method_class_index,
3532 enclosing_method_method_index,
3533 CHECK);
3534 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3535 guarantee_property(
3536 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3537 "Wrong InnerClasses attribute length in class file %s", CHECK);
3538 }
3539 }
3540
3541 if (parsed_nest_members_attribute) {
3542 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3543 cfs,
3544 nest_members_attribute_start,
3545 CHECK);
3546 if (_need_verify) {
3547 guarantee_property(
3548 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3549 "Wrong NestMembers attribute length in class file %s", CHECK);
3550 }
3551 }
3552
3553 if (_max_bootstrap_specifier_index >= 0) {
3554 guarantee_property(parsed_bootstrap_methods_attribute,
3555 "Missing BootstrapMethods attribute in class file %s", CHECK);
3556 }
3557 }
3558
3559 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3560 assert(k != NULL, "invariant");
3561
3562 if (_synthetic_flag)
3563 k->set_is_synthetic();
3564 if (_sourcefile_index != 0) {
3565 k->set_source_file_name_index(_sourcefile_index);
3566 }
3567 if (_generic_signature_index != 0) {
3568 k->set_generic_signature_index(_generic_signature_index);
3569 }
3570 if (_sde_buffer != NULL) {
3571 k->set_source_debug_extension(_sde_buffer, _sde_length);
3572 }
3573 }
3574
3575 // Create the Annotations object that will
3576 // hold the annotations array for the Klass.
3577 void ClassFileParser::create_combined_annotations(TRAPS) {
3578 if (_annotations == NULL &&
3579 _type_annotations == NULL &&
3580 _fields_annotations == NULL &&
3581 _fields_type_annotations == NULL) {
3582 // Don't create the Annotations object unnecessarily.
3583 return;
3584 }
3585
3586 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3587 annotations->set_class_annotations(_annotations);
3588 annotations->set_class_type_annotations(_type_annotations);
3589 annotations->set_fields_annotations(_fields_annotations);
3590 annotations->set_fields_type_annotations(_fields_type_annotations);
3591
3592 // This is the Annotations object that will be
3593 // assigned to InstanceKlass being constructed.
3594 _combined_annotations = annotations;
3595
3596 // The annotations arrays below has been transfered the
3597 // _combined_annotations so these fields can now be cleared.
3598 _annotations = NULL;
3599 _type_annotations = NULL;
3600 _fields_annotations = NULL;
3601 _fields_type_annotations = NULL;
3602 }
3603
3604 // Transfer ownership of metadata allocated to the InstanceKlass.
3605 void ClassFileParser::apply_parsed_class_metadata(
3606 InstanceKlass* this_klass,
3607 int java_fields_count, TRAPS) {
3608 assert(this_klass != NULL, "invariant");
3609
3610 _cp->set_pool_holder(this_klass);
3611 this_klass->set_constants(_cp);
3612 this_klass->set_fields(_fields, java_fields_count);
3613 this_klass->set_methods(_methods);
3614 this_klass->set_inner_classes(_inner_classes);
3615 this_klass->set_nest_members(_nest_members);
3616 this_klass->set_nest_host_index(_nest_host);
3617 this_klass->set_local_interfaces(_local_interfaces);
3618 this_klass->set_transitive_interfaces(_transitive_interfaces);
3619 this_klass->set_annotations(_combined_annotations);
3620
3621 // Clear out these fields so they don't get deallocated by the destructor
3622 clear_class_metadata();
3623 }
3624
3625 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3626 int runtime_visible_annotations_length,
3627 const u1* const runtime_invisible_annotations,
3628 int runtime_invisible_annotations_length,
3629 TRAPS) {
3630 AnnotationArray* annotations = NULL;
3631 if (runtime_visible_annotations != NULL ||
3632 runtime_invisible_annotations != NULL) {
3633 annotations = MetadataFactory::new_array<u1>(_loader_data,
3634 runtime_visible_annotations_length +
3635 runtime_invisible_annotations_length,
3636 CHECK_(annotations));
3637 if (runtime_visible_annotations != NULL) {
3638 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3639 annotations->at_put(i, runtime_visible_annotations[i]);
3640 }
3641 }
3642 if (runtime_invisible_annotations != NULL) {
3643 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3644 int append = runtime_visible_annotations_length+i;
3645 annotations->at_put(append, runtime_invisible_annotations[i]);
3646 }
3647 }
3648 }
3649 return annotations;
3650 }
3651
3652 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3653 const int super_class_index,
3654 const bool need_verify,
3655 TRAPS) {
3656 assert(cp != NULL, "invariant");
3657 const InstanceKlass* super_klass = NULL;
3658
3659 if (super_class_index == 0) {
3660 check_property(_class_name == vmSymbols::java_lang_Object(),
3661 "Invalid superclass index %u in class file %s",
3662 super_class_index,
3663 CHECK_NULL);
3664 } else {
3665 check_property(valid_klass_reference_at(super_class_index),
3666 "Invalid superclass index %u in class file %s",
3667 super_class_index,
3668 CHECK_NULL);
3669 // The class name should be legal because it is checked when parsing constant pool.
3670 // However, make sure it is not an array type.
3671 bool is_array = false;
3672 if (cp->tag_at(super_class_index).is_klass()) {
3673 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3674 if (need_verify)
3675 is_array = super_klass->is_array_klass();
3676 } else if (need_verify) {
3677 is_array = (cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3678 }
3679 if (need_verify) {
3680 guarantee_property(!is_array,
3681 "Bad superclass name in class file %s", CHECK_NULL);
3682 }
3683 }
3684 return super_klass;
3685 }
3686
3687 static unsigned int compute_oop_map_count(const InstanceKlass* super,
3688 unsigned int nonstatic_oop_map_count,
3689 int first_nonstatic_oop_offset) {
3690
3691 unsigned int map_count =
3692 NULL == super ? 0 : super->nonstatic_oop_map_count();
3693 if (nonstatic_oop_map_count > 0) {
3694 // We have oops to add to map
3695 if (map_count == 0) {
3696 map_count = nonstatic_oop_map_count;
3697 }
3698 else {
3699 // Check whether we should add a new map block or whether the last one can
3700 // be extended
3701 const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3702 const OopMapBlock* const last_map = first_map + map_count - 1;
3703
3704 const int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3705 if (next_offset == first_nonstatic_oop_offset) {
3706 // There is no gap bettwen superklass's last oop field and first
3707 // local oop field, merge maps.
3708 nonstatic_oop_map_count -= 1;
3709 }
3710 else {
3711 // Superklass didn't end with a oop field, add extra maps
3712 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3713 }
3714 map_count += nonstatic_oop_map_count;
3715 }
3716 }
3717 return map_count;
3718 }
3719
3720 #ifndef PRODUCT
3721 static void print_field_layout(const Symbol* name,
3722 Array<u2>* fields,
3723 const constantPoolHandle& cp,
3724 int instance_size,
3725 int instance_fields_start,
3726 int instance_fields_end,
3727 int static_fields_end) {
3728
3729 assert(name != NULL, "invariant");
3730
3731 tty->print("%s: field layout\n", name->as_klass_external_name());
3732 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3733 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3734 if (!fs.access_flags().is_static()) {
3735 tty->print(" @%3d \"%s\" %s\n",
3736 fs.offset(),
3737 fs.name()->as_klass_external_name(),
3738 fs.signature()->as_klass_external_name());
3739 }
3740 }
3741 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3742 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3743 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3744 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3745 if (fs.access_flags().is_static()) {
3746 tty->print(" @%3d \"%s\" %s\n",
3747 fs.offset(),
3748 fs.name()->as_klass_external_name(),
3749 fs.signature()->as_klass_external_name());
3750 }
3751 }
3752 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3753 tty->print("\n");
3754 }
3755 #endif
3756
3757 // Values needed for oopmap and InstanceKlass creation
3758 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3759 public:
3760 int* nonstatic_oop_offsets;
3761 unsigned int* nonstatic_oop_counts;
3762 unsigned int nonstatic_oop_map_count;
3763 unsigned int total_oop_map_count;
3764 int instance_size;
3765 int nonstatic_field_size;
3766 int static_field_size;
3767 bool has_nonstatic_fields;
3768 };
3769
3770 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3771 void ClassFileParser::layout_fields(ConstantPool* cp,
3772 const FieldAllocationCount* fac,
3773 const ClassAnnotationCollector* parsed_annotations,
3774 FieldLayoutInfo* info,
3775 TRAPS) {
3776
3777 assert(cp != NULL, "invariant");
3778
3779 // Field size and offset computation
3780 int nonstatic_field_size = _super_klass == NULL ? 0 :
3781 _super_klass->nonstatic_field_size();
3782
3783 // Count the contended fields by type.
3784 //
3785 // We ignore static fields, because @Contended is not supported for them.
3786 // The layout code below will also ignore the static fields.
3787 int nonstatic_contended_count = 0;
3788 FieldAllocationCount fac_contended;
3789 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3790 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3791 if (fs.is_contended()) {
3792 fac_contended.count[atype]++;
3793 if (!fs.access_flags().is_static()) {
3794 nonstatic_contended_count++;
3795 }
3796 }
3797 }
3798
3799
3800 // Calculate the starting byte offsets
3801 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3802 int next_static_double_offset = next_static_oop_offset +
3803 ((fac->count[STATIC_OOP]) * heapOopSize);
3804 if ( fac->count[STATIC_DOUBLE] &&
3805 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3806 Universe::field_type_should_be_aligned(T_LONG)) ) {
3807 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
3808 }
3809
3810 int next_static_word_offset = next_static_double_offset +
3811 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3812 int next_static_short_offset = next_static_word_offset +
3813 ((fac->count[STATIC_WORD]) * BytesPerInt);
3814 int next_static_byte_offset = next_static_short_offset +
3815 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3816
3817 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3818 nonstatic_field_size * heapOopSize;
3819
3820 int next_nonstatic_field_offset = nonstatic_fields_start;
3821
3822 const bool is_contended_class = parsed_annotations->is_contended();
3823
3824 // Class is contended, pad before all the fields
3825 if (is_contended_class) {
3826 next_nonstatic_field_offset += ContendedPaddingWidth;
3827 }
3828
3829 // Compute the non-contended fields count.
3830 // The packing code below relies on these counts to determine if some field
3831 // can be squeezed into the alignment gap. Contended fields are obviously
3832 // exempt from that.
3833 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3834 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3835 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3836 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3837 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3838
3839 // Total non-static fields count, including every contended field
3840 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3841 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3842 fac->count[NONSTATIC_OOP];
3843
3844 const bool super_has_nonstatic_fields =
3845 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
3846 const bool has_nonstatic_fields =
3847 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3848
3849
3850 // Prepare list of oops for oop map generation.
3851 //
3852 // "offset" and "count" lists are describing the set of contiguous oop
3853 // regions. offset[i] is the start of the i-th region, which then has
3854 // count[i] oops following. Before we know how many regions are required,
3855 // we pessimistically allocate the maps to fit all the oops into the
3856 // distinct regions.
3857 //
3858 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3859 // to figure out if we still need to do this.
3860 unsigned int nonstatic_oop_map_count = 0;
3861 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3862
3863 int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3864 THREAD, int, max_nonstatic_oop_maps);
3865 unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3866 THREAD, unsigned int, max_nonstatic_oop_maps);
3867
3868 int first_nonstatic_oop_offset = 0; // will be set for first oop field
3869
3870 bool compact_fields = CompactFields;
3871 int allocation_style = FieldsAllocationStyle;
3872 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3873 assert(false, "0 <= FieldsAllocationStyle <= 2");
3874 allocation_style = 1; // Optimistic
3875 }
3876
3877 // The next classes have predefined hard-coded fields offsets
3878 // (see in JavaClasses::compute_hard_coded_offsets()).
3879 // Use default fields allocation order for them.
3880 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
3881 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3882 _class_name == vmSymbols::java_lang_Class() ||
3883 _class_name == vmSymbols::java_lang_ClassLoader() ||
3884 _class_name == vmSymbols::java_lang_ref_Reference() ||
3885 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3886 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3887 _class_name == vmSymbols::java_lang_String() ||
3888 _class_name == vmSymbols::java_lang_Throwable() ||
3889 _class_name == vmSymbols::java_lang_Boolean() ||
3890 _class_name == vmSymbols::java_lang_Character() ||
3891 _class_name == vmSymbols::java_lang_Float() ||
3892 _class_name == vmSymbols::java_lang_Double() ||
3893 _class_name == vmSymbols::java_lang_Byte() ||
3894 _class_name == vmSymbols::java_lang_Short() ||
3895 _class_name == vmSymbols::java_lang_Integer() ||
3896 _class_name == vmSymbols::java_lang_Long())) {
3897 allocation_style = 0; // Allocate oops first
3898 compact_fields = false; // Don't compact fields
3899 }
3900
3901 int next_nonstatic_oop_offset = 0;
3902 int next_nonstatic_double_offset = 0;
3903
3904 // Rearrange fields for a given allocation style
3905 if( allocation_style == 0 ) {
3906 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3907 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3908 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3909 (nonstatic_oop_count * heapOopSize);
3910 } else if( allocation_style == 1 ) {
3911 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3912 next_nonstatic_double_offset = next_nonstatic_field_offset;
3913 } else if( allocation_style == 2 ) {
3914 // Fields allocation: oops fields in super and sub classes are together.
3915 if( nonstatic_field_size > 0 && _super_klass != NULL &&
3916 _super_klass->nonstatic_oop_map_size() > 0 ) {
3917 const unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3918 const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps();
3919 const OopMapBlock* const last_map = first_map + map_count - 1;
3920 const int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3921 if (next_offset == next_nonstatic_field_offset) {
3922 allocation_style = 0; // allocate oops first
3923 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3924 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3925 (nonstatic_oop_count * heapOopSize);
3926 }
3927 }
3928 if( allocation_style == 2 ) {
3929 allocation_style = 1; // allocate oops last
3930 next_nonstatic_double_offset = next_nonstatic_field_offset;
3931 }
3932 } else {
3933 ShouldNotReachHere();
3934 }
3935
3936 int nonstatic_oop_space_count = 0;
3937 int nonstatic_word_space_count = 0;
3938 int nonstatic_short_space_count = 0;
3939 int nonstatic_byte_space_count = 0;
3940 int nonstatic_oop_space_offset = 0;
3941 int nonstatic_word_space_offset = 0;
3942 int nonstatic_short_space_offset = 0;
3943 int nonstatic_byte_space_offset = 0;
3944
3945 // Try to squeeze some of the fields into the gaps due to
3946 // long/double alignment.
3947 if (nonstatic_double_count > 0) {
3948 int offset = next_nonstatic_double_offset;
3949 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
3950 if (compact_fields && offset != next_nonstatic_double_offset) {
3951 // Allocate available fields into the gap before double field.
3952 int length = next_nonstatic_double_offset - offset;
3953 assert(length == BytesPerInt, "");
3954 nonstatic_word_space_offset = offset;
3955 if (nonstatic_word_count > 0) {
3956 nonstatic_word_count -= 1;
3957 nonstatic_word_space_count = 1; // Only one will fit
3958 length -= BytesPerInt;
3959 offset += BytesPerInt;
3960 }
3961 nonstatic_short_space_offset = offset;
3962 while (length >= BytesPerShort && nonstatic_short_count > 0) {
3963 nonstatic_short_count -= 1;
3964 nonstatic_short_space_count += 1;
3965 length -= BytesPerShort;
3966 offset += BytesPerShort;
3967 }
3968 nonstatic_byte_space_offset = offset;
3969 while (length > 0 && nonstatic_byte_count > 0) {
3970 nonstatic_byte_count -= 1;
3971 nonstatic_byte_space_count += 1;
3972 length -= 1;
3973 }
3974 // Allocate oop field in the gap if there are no other fields for that.
3975 nonstatic_oop_space_offset = offset;
3976 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
3977 allocation_style != 0) { // when oop fields not first
3978 nonstatic_oop_count -= 1;
3979 nonstatic_oop_space_count = 1; // Only one will fit
3980 length -= heapOopSize;
3981 offset += heapOopSize;
3982 }
3983 }
3984 }
3985
3986 int next_nonstatic_word_offset = next_nonstatic_double_offset +
3987 (nonstatic_double_count * BytesPerLong);
3988 int next_nonstatic_short_offset = next_nonstatic_word_offset +
3989 (nonstatic_word_count * BytesPerInt);
3990 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
3991 (nonstatic_short_count * BytesPerShort);
3992 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3993 nonstatic_byte_count;
3994
3995 // let oops jump before padding with this allocation style
3996 if( allocation_style == 1 ) {
3997 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3998 if( nonstatic_oop_count > 0 ) {
3999 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4000 }
4001 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4002 }
4003
4004 // Iterate over fields again and compute correct offsets.
4005 // The field allocation type was temporarily stored in the offset slot.
4006 // oop fields are located before non-oop fields (static and non-static).
4007 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4008
4009 // skip already laid out fields
4010 if (fs.is_offset_set()) continue;
4011
4012 // contended instance fields are handled below
4013 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4014
4015 int real_offset = 0;
4016 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4017
4018 // pack the rest of the fields
4019 switch (atype) {
4020 case STATIC_OOP:
4021 real_offset = next_static_oop_offset;
4022 next_static_oop_offset += heapOopSize;
4023 break;
4024 case STATIC_BYTE:
4025 real_offset = next_static_byte_offset;
4026 next_static_byte_offset += 1;
4027 break;
4028 case STATIC_SHORT:
4029 real_offset = next_static_short_offset;
4030 next_static_short_offset += BytesPerShort;
4031 break;
4032 case STATIC_WORD:
4033 real_offset = next_static_word_offset;
4034 next_static_word_offset += BytesPerInt;
4035 break;
4036 case STATIC_DOUBLE:
4037 real_offset = next_static_double_offset;
4038 next_static_double_offset += BytesPerLong;
4039 break;
4040 case NONSTATIC_OOP:
4041 if( nonstatic_oop_space_count > 0 ) {
4042 real_offset = nonstatic_oop_space_offset;
4043 nonstatic_oop_space_offset += heapOopSize;
4044 nonstatic_oop_space_count -= 1;
4045 } else {
4046 real_offset = next_nonstatic_oop_offset;
4047 next_nonstatic_oop_offset += heapOopSize;
4048 }
4049
4050 // Record this oop in the oop maps
4051 if( nonstatic_oop_map_count > 0 &&
4052 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4053 real_offset -
4054 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4055 heapOopSize ) {
4056 // This oop is adjacent to the previous one, add to current oop map
4057 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4058 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4059 } else {
4060 // This oop is not adjacent to the previous one, create new oop map
4061 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4062 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4063 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4064 nonstatic_oop_map_count += 1;
4065 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4066 first_nonstatic_oop_offset = real_offset;
4067 }
4068 }
4069 break;
4070 case NONSTATIC_BYTE:
4071 if( nonstatic_byte_space_count > 0 ) {
4072 real_offset = nonstatic_byte_space_offset;
4073 nonstatic_byte_space_offset += 1;
4074 nonstatic_byte_space_count -= 1;
4075 } else {
4076 real_offset = next_nonstatic_byte_offset;
4077 next_nonstatic_byte_offset += 1;
4078 }
4079 break;
4080 case NONSTATIC_SHORT:
4081 if( nonstatic_short_space_count > 0 ) {
4082 real_offset = nonstatic_short_space_offset;
4083 nonstatic_short_space_offset += BytesPerShort;
4084 nonstatic_short_space_count -= 1;
4085 } else {
4086 real_offset = next_nonstatic_short_offset;
4087 next_nonstatic_short_offset += BytesPerShort;
4088 }
4089 break;
4090 case NONSTATIC_WORD:
4091 if( nonstatic_word_space_count > 0 ) {
4092 real_offset = nonstatic_word_space_offset;
4093 nonstatic_word_space_offset += BytesPerInt;
4094 nonstatic_word_space_count -= 1;
4095 } else {
4096 real_offset = next_nonstatic_word_offset;
4097 next_nonstatic_word_offset += BytesPerInt;
4098 }
4099 break;
4100 case NONSTATIC_DOUBLE:
4101 real_offset = next_nonstatic_double_offset;
4102 next_nonstatic_double_offset += BytesPerLong;
4103 break;
4104 default:
4105 ShouldNotReachHere();
4106 }
4107 fs.set_offset(real_offset);
4108 }
4109
4110
4111 // Handle the contended cases.
4112 //
4113 // Each contended field should not intersect the cache line with another contended field.
4114 // In the absence of alignment information, we end up with pessimistically separating
4115 // the fields with full-width padding.
4116 //
4117 // Additionally, this should not break alignment for the fields, so we round the alignment up
4118 // for each field.
4119 if (nonstatic_contended_count > 0) {
4120
4121 // if there is at least one contended field, we need to have pre-padding for them
4122 next_nonstatic_padded_offset += ContendedPaddingWidth;
4123
4124 // collect all contended groups
4125 ResourceBitMap bm(cp->size());
4126 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4127 // skip already laid out fields
4128 if (fs.is_offset_set()) continue;
4129
4130 if (fs.is_contended()) {
4131 bm.set_bit(fs.contended_group());
4132 }
4133 }
4134
4135 int current_group = -1;
4136 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4137
4138 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4139
4140 // skip already laid out fields
4141 if (fs.is_offset_set()) continue;
4142
4143 // skip non-contended fields and fields from different group
4144 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4145
4146 // handle statics below
4147 if (fs.access_flags().is_static()) continue;
4148
4149 int real_offset = 0;
4150 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4151
4152 switch (atype) {
4153 case NONSTATIC_BYTE:
4154 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4155 real_offset = next_nonstatic_padded_offset;
4156 next_nonstatic_padded_offset += 1;
4157 break;
4158
4159 case NONSTATIC_SHORT:
4160 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4161 real_offset = next_nonstatic_padded_offset;
4162 next_nonstatic_padded_offset += BytesPerShort;
4163 break;
4164
4165 case NONSTATIC_WORD:
4166 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4167 real_offset = next_nonstatic_padded_offset;
4168 next_nonstatic_padded_offset += BytesPerInt;
4169 break;
4170
4171 case NONSTATIC_DOUBLE:
4172 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4173 real_offset = next_nonstatic_padded_offset;
4174 next_nonstatic_padded_offset += BytesPerLong;
4175 break;
4176
4177 case NONSTATIC_OOP:
4178 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4179 real_offset = next_nonstatic_padded_offset;
4180 next_nonstatic_padded_offset += heapOopSize;
4181
4182 // Record this oop in the oop maps
4183 if( nonstatic_oop_map_count > 0 &&
4184 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4185 real_offset -
4186 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4187 heapOopSize ) {
4188 // This oop is adjacent to the previous one, add to current oop map
4189 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4190 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4191 } else {
4192 // This oop is not adjacent to the previous one, create new oop map
4193 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4194 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4195 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4196 nonstatic_oop_map_count += 1;
4197 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4198 first_nonstatic_oop_offset = real_offset;
4199 }
4200 }
4201 break;
4202
4203 default:
4204 ShouldNotReachHere();
4205 }
4206
4207 if (fs.contended_group() == 0) {
4208 // Contended group defines the equivalence class over the fields:
4209 // the fields within the same contended group are not inter-padded.
4210 // The only exception is default group, which does not incur the
4211 // equivalence, and so requires intra-padding.
4212 next_nonstatic_padded_offset += ContendedPaddingWidth;
4213 }
4214
4215 fs.set_offset(real_offset);
4216 } // for
4217
4218 // Start laying out the next group.
4219 // Note that this will effectively pad the last group in the back;
4220 // this is expected to alleviate memory contention effects for
4221 // subclass fields and/or adjacent object.
4222 // If this was the default group, the padding is already in place.
4223 if (current_group != 0) {
4224 next_nonstatic_padded_offset += ContendedPaddingWidth;
4225 }
4226 }
4227
4228 // handle static fields
4229 }
4230
4231 // Entire class is contended, pad in the back.
4232 // This helps to alleviate memory contention effects for subclass fields
4233 // and/or adjacent object.
4234 if (is_contended_class) {
4235 next_nonstatic_padded_offset += ContendedPaddingWidth;
4236 }
4237
4238 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4239
4240 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize);
4241 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4242 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4243
4244 int static_field_size = (static_fields_end -
4245 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4246 nonstatic_field_size = nonstatic_field_size +
4247 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4248
4249 int instance_size = align_object_size(instance_end / wordSize);
4250
4251 assert(instance_size == align_object_size(align_up(
4252 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
4253 wordSize) / wordSize), "consistent layout helper value");
4254
4255 // Invariant: nonstatic_field end/start should only change if there are
4256 // nonstatic fields in the class, or if the class is contended. We compare
4257 // against the non-aligned value, so that end alignment will not fail the
4258 // assert without actually having the fields.
4259 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4260 is_contended_class ||
4261 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4262
4263 // Number of non-static oop map blocks allocated at end of klass.
4264 const unsigned int total_oop_map_count =
4265 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
4266 first_nonstatic_oop_offset);
4267
4268 #ifndef PRODUCT
4269 if (PrintFieldLayout) {
4270 print_field_layout(_class_name,
4271 _fields,
4272 cp,
4273 instance_size,
4274 nonstatic_fields_start,
4275 nonstatic_fields_end,
4276 static_fields_end);
4277 }
4278
4279 #endif
4280 // Pass back information needed for InstanceKlass creation
4281 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
4282 info->nonstatic_oop_counts = nonstatic_oop_counts;
4283 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
4284 info->total_oop_map_count = total_oop_map_count;
4285 info->instance_size = instance_size;
4286 info->static_field_size = static_field_size;
4287 info->nonstatic_field_size = nonstatic_field_size;
4288 info->has_nonstatic_fields = has_nonstatic_fields;
4289 }
4290
4291 static void fill_oop_maps(const InstanceKlass* k,
4292 unsigned int nonstatic_oop_map_count,
4293 const int* nonstatic_oop_offsets,
4294 const unsigned int* nonstatic_oop_counts) {
4295
4296 assert(k != NULL, "invariant");
4297
4298 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4299 const InstanceKlass* const super = k->superklass();
4300 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4301 if (super_count > 0) {
4302 // Copy maps from superklass
4303 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4304 for (unsigned int i = 0; i < super_count; ++i) {
4305 *this_oop_map++ = *super_oop_map++;
4306 }
4307 }
4308
4309 if (nonstatic_oop_map_count > 0) {
4310 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4311 // The counts differ because there is no gap between superklass's last oop
4312 // field and the first local oop field. Extend the last oop map copied
4313 // from the superklass instead of creating new one.
4314 nonstatic_oop_map_count--;
4315 nonstatic_oop_offsets++;
4316 this_oop_map--;
4317 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4318 this_oop_map++;
4319 }
4320
4321 // Add new map blocks, fill them
4322 while (nonstatic_oop_map_count-- > 0) {
4323 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4324 this_oop_map->set_count(*nonstatic_oop_counts++);
4325 this_oop_map++;
4326 }
4327 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4328 this_oop_map, "sanity");
4329 }
4330 }
4331
4332
4333 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4334 assert(ik != NULL, "invariant");
4335
4336 const Klass* const super = ik->super();
4337
4338 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4339 // in which case we don't have to register objects as finalizable
4340 if (!_has_empty_finalizer) {
4341 if (_has_finalizer ||
4342 (super != NULL && super->has_finalizer())) {
4343 ik->set_has_finalizer();
4344 }
4345 }
4346
4347 #ifdef ASSERT
4348 bool f = false;
4349 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4350 vmSymbols::void_method_signature());
4351 if (m != NULL && !m->is_empty_method()) {
4352 f = true;
4353 }
4354
4355 // Spec doesn't prevent agent from redefinition of empty finalizer.
4356 // Despite the fact that it's generally bad idea and redefined finalizer
4357 // will not work as expected we shouldn't abort vm in this case
4358 if (!ik->has_redefined_this_or_super()) {
4359 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4360 }
4361 #endif
4362
4363 // Check if this klass supports the java.lang.Cloneable interface
4364 if (SystemDictionary::Cloneable_klass_loaded()) {
4365 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4366 ik->set_is_cloneable();
4367 }
4368 }
4369
4370 // Check if this klass has a vanilla default constructor
4371 if (super == NULL) {
4372 // java.lang.Object has empty default constructor
4373 ik->set_has_vanilla_constructor();
4374 } else {
4375 if (super->has_vanilla_constructor() &&
4376 _has_vanilla_constructor) {
4377 ik->set_has_vanilla_constructor();
4378 }
4379 #ifdef ASSERT
4380 bool v = false;
4381 if (super->has_vanilla_constructor()) {
4382 const Method* const constructor =
4383 ik->find_method(vmSymbols::object_initializer_name(),
4384 vmSymbols::void_method_signature());
4385 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4386 v = true;
4387 }
4388 }
4389 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4390 #endif
4391 }
4392
4393 // If it cannot be fast-path allocated, set a bit in the layout helper.
4394 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4395 assert(ik->size_helper() > 0, "layout_helper is initialized");
4396 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4397 || ik->is_abstract() || ik->is_interface()
4398 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4399 || ik->size_helper() >= FastAllocateSizeLimit) {
4400 // Forbid fast-path allocation.
4401 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4402 ik->set_layout_helper(lh);
4403 }
4404 }
4405
4406 // Attach super classes and interface classes to class loader data
4407 static void record_defined_class_dependencies(const InstanceKlass* defined_klass,
4408 TRAPS) {
4409 assert(defined_klass != NULL, "invariant");
4410
4411 ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data();
4412 if (defining_loader_data->is_the_null_class_loader_data()) {
4413 // Dependencies to null class loader data are implicit.
4414 return;
4415 } else {
4416 // add super class dependency
4417 Klass* const super = defined_klass->super();
4418 if (super != NULL) {
4419 defining_loader_data->record_dependency(super, CHECK);
4420 }
4421
4422 // add super interface dependencies
4423 const Array<Klass*>* const local_interfaces = defined_klass->local_interfaces();
4424 if (local_interfaces != NULL) {
4425 const int length = local_interfaces->length();
4426 for (int i = 0; i < length; i++) {
4427 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4428 }
4429 }
4430 }
4431 }
4432
4433 // utility methods for appending an array with check for duplicates
4434
4435 static void append_interfaces(GrowableArray<Klass*>* result,
4436 const Array<Klass*>* const ifs) {
4437 // iterate over new interfaces
4438 for (int i = 0; i < ifs->length(); i++) {
4439 Klass* const e = ifs->at(i);
4440 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4441 // add new interface
4442 result->append_if_missing(e);
4443 }
4444 }
4445
4446 static Array<Klass*>* compute_transitive_interfaces(const InstanceKlass* super,
4447 Array<Klass*>* local_ifs,
4448 ClassLoaderData* loader_data,
4449 TRAPS) {
4450 assert(local_ifs != NULL, "invariant");
4451 assert(loader_data != NULL, "invariant");
4452
4453 // Compute maximum size for transitive interfaces
4454 int max_transitive_size = 0;
4455 int super_size = 0;
4456 // Add superclass transitive interfaces size
4457 if (super != NULL) {
4458 super_size = super->transitive_interfaces()->length();
4459 max_transitive_size += super_size;
4460 }
4461 // Add local interfaces' super interfaces
4462 const int local_size = local_ifs->length();
4463 for (int i = 0; i < local_size; i++) {
4464 Klass* const l = local_ifs->at(i);
4465 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4466 }
4467 // Finally add local interfaces
4468 max_transitive_size += local_size;
4469 // Construct array
4470 if (max_transitive_size == 0) {
4471 // no interfaces, use canonicalized array
4472 return Universe::the_empty_klass_array();
4473 } else if (max_transitive_size == super_size) {
4474 // no new local interfaces added, share superklass' transitive interface array
4475 return super->transitive_interfaces();
4476 } else if (max_transitive_size == local_size) {
4477 // only local interfaces added, share local interface array
4478 return local_ifs;
4479 } else {
4480 ResourceMark rm;
4481 GrowableArray<Klass*>* const result = new GrowableArray<Klass*>(max_transitive_size);
4482
4483 // Copy down from superclass
4484 if (super != NULL) {
4485 append_interfaces(result, super->transitive_interfaces());
4486 }
4487
4488 // Copy down from local interfaces' superinterfaces
4489 for (int i = 0; i < local_size; i++) {
4490 Klass* const l = local_ifs->at(i);
4491 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4492 }
4493 // Finally add local interfaces
4494 append_interfaces(result, local_ifs);
4495
4496 // length will be less than the max_transitive_size if duplicates were removed
4497 const int length = result->length();
4498 assert(length <= max_transitive_size, "just checking");
4499 Array<Klass*>* const new_result =
4500 MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL);
4501 for (int i = 0; i < length; i++) {
4502 Klass* const e = result->at(i);
4503 assert(e != NULL, "just checking");
4504 new_result->at_put(i, e);
4505 }
4506 return new_result;
4507 }
4508 }
4509
4510 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4511 assert(this_klass != NULL, "invariant");
4512 const Klass* const super = this_klass->super();
4513 if (super != NULL) {
4514
4515 // If the loader is not the boot loader then throw an exception if its
4516 // superclass is in package jdk.internal.reflect and its loader is not a
4517 // special reflection class loader
4518 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4519 assert(super->is_instance_klass(), "super is not instance klass");
4520 PackageEntry* super_package = super->package();
4521 if (super_package != NULL &&
4522 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4523 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4524 ResourceMark rm(THREAD);
4525 Exceptions::fthrow(
4526 THREAD_AND_LOCATION,
4527 vmSymbols::java_lang_IllegalAccessError(),
4528 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4529 this_klass->external_name(),
4530 this_klass->class_loader_data()->loader_name(),
4531 super->external_name());
4532 return;
4533 }
4534 }
4535
4536 Reflection::VerifyClassAccessResults vca_result =
4537 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), 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(super),
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 superclass %s",
4548 this_klass->external_name(),
4549 super->external_name());
4550 } else {
4551 // Add additional message content.
4552 Exceptions::fthrow(
4553 THREAD_AND_LOCATION,
4554 vmSymbols::java_lang_IllegalAccessError(),
4555 "superclass access check failed: %s",
4556 msg);
4557 }
4558 }
4559 }
4560 }
4561
4562
4563 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4564 assert(this_klass != NULL, "invariant");
4565 const Array<Klass*>* const local_interfaces = this_klass->local_interfaces();
4566 const int lng = local_interfaces->length();
4567 for (int i = lng - 1; i >= 0; i--) {
4568 Klass* const k = local_interfaces->at(i);
4569 assert (k != NULL && k->is_interface(), "invalid interface");
4570 Reflection::VerifyClassAccessResults vca_result =
4571 Reflection::verify_class_access(this_klass, InstanceKlass::cast(k), false);
4572 if (vca_result != Reflection::ACCESS_OK) {
4573 ResourceMark rm(THREAD);
4574 char* msg = Reflection::verify_class_access_msg(this_klass,
4575 InstanceKlass::cast(k),
4576 vca_result);
4577 if (msg == NULL) {
4578 Exceptions::fthrow(
4579 THREAD_AND_LOCATION,
4580 vmSymbols::java_lang_IllegalAccessError(),
4581 "class %s cannot access its superinterface %s",
4582 this_klass->external_name(),
4583 k->external_name());
4584 } else {
4585 // Add additional message content.
4586 Exceptions::fthrow(
4587 THREAD_AND_LOCATION,
4588 vmSymbols::java_lang_IllegalAccessError(),
4589 "superinterface check failed: %s",
4590 msg);
4591 }
4592 }
4593 }
4594 }
4595
4596
4597 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4598 assert(this_klass != NULL, "invariant");
4599 const Array<Method*>* const methods = this_klass->methods();
4600 const int num_methods = methods->length();
4601
4602 // go thru each method and check if it overrides a final method
4603 for (int index = 0; index < num_methods; index++) {
4604 const Method* const m = methods->at(index);
4605
4606 // skip private, static, and <init> methods
4607 if ((!m->is_private() && !m->is_static()) &&
4608 (m->name() != vmSymbols::object_initializer_name())) {
4609
4610 const Symbol* const name = m->name();
4611 const Symbol* const signature = m->signature();
4612 const Klass* k = this_klass->super();
4613 const Method* super_m = NULL;
4614 while (k != NULL) {
4615 // skip supers that don't have final methods.
4616 if (k->has_final_method()) {
4617 // lookup a matching method in the super class hierarchy
4618 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4619 if (super_m == NULL) {
4620 break; // didn't find any match; get out
4621 }
4622
4623 if (super_m->is_final() && !super_m->is_static() &&
4624 !super_m->access_flags().is_private() &&
4625 // matching method in super is final, and not static or private
4626 (Reflection::verify_field_access(this_klass,
4627 super_m->method_holder(),
4628 super_m->method_holder(),
4629 super_m->access_flags(), false))
4630 // this class can access super final method and therefore override
4631 ) {
4632 // Propagate any existing exceptions that may have been thrown
4633 if (HAS_PENDING_EXCEPTION) {
4634 return;
4635 }
4636
4637 ResourceMark rm(THREAD);
4638 Exceptions::fthrow(
4639 THREAD_AND_LOCATION,
4640 vmSymbols::java_lang_VerifyError(),
4641 "class %s overrides final method %s.%s%s",
4642 this_klass->external_name(),
4643 super_m->method_holder()->external_name(),
4644 name->as_C_string(),
4645 signature->as_C_string()
4646 );
4647 return;
4648 }
4649
4650 // continue to look from super_m's holder's super.
4651 k = super_m->method_holder()->super();
4652 continue;
4653 }
4654
4655 k = k->super();
4656 }
4657 }
4658 }
4659 }
4660
4661
4662 // assumes that this_klass is an interface
4663 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4664 assert(this_klass != NULL, "invariant");
4665 assert(this_klass->is_interface(), "not an interface");
4666 const Array<Method*>* methods = this_klass->methods();
4667 const int num_methods = methods->length();
4668
4669 for (int index = 0; index < num_methods; index++) {
4670 const Method* const m = methods->at(index);
4671 // if m is static and not the init method, throw a verify error
4672 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4673 ResourceMark rm(THREAD);
4674 Exceptions::fthrow(
4675 THREAD_AND_LOCATION,
4676 vmSymbols::java_lang_VerifyError(),
4677 "Illegal static method %s in interface %s",
4678 m->name()->as_C_string(),
4679 this_klass->external_name()
4680 );
4681 return;
4682 }
4683 }
4684 }
4685
4686 // utility methods for format checking
4687
4688 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4689 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4690 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4691 if (is_module) {
4692 ResourceMark rm(THREAD);
4693 Exceptions::fthrow(
4694 THREAD_AND_LOCATION,
4695 vmSymbols::java_lang_NoClassDefFoundError(),
4696 "%s is not a class because access_flag ACC_MODULE is set",
4697 _class_name->as_C_string());
4698 return;
4699 }
4700
4701 if (!_need_verify) { return; }
4702
4703 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4704 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4705 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4706 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4707 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4708 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4709 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4710
4711 if ((is_abstract && is_final) ||
4712 (is_interface && !is_abstract) ||
4713 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4714 (!is_interface && major_gte_15 && is_annotation)) {
4715 ResourceMark rm(THREAD);
4716 Exceptions::fthrow(
4717 THREAD_AND_LOCATION,
4718 vmSymbols::java_lang_ClassFormatError(),
4719 "Illegal class modifiers in class %s: 0x%X",
4720 _class_name->as_C_string(), flags
4721 );
4722 return;
4723 }
4724 }
4725
4726 static bool has_illegal_visibility(jint flags) {
4727 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4728 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4729 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4730
4731 return ((is_public && is_protected) ||
4732 (is_public && is_private) ||
4733 (is_protected && is_private));
4734 }
4735
4736 static bool is_supported_version(u2 major, u2 minor){
4737 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4738 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4739 (major <= max_version) &&
4740 ((major != max_version) ||
4741 (minor <= JVM_CLASSFILE_MINOR_VERSION));
4742 }
4743
4744 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4745 bool is_interface,
4746 TRAPS) const {
4747 if (!_need_verify) { return; }
4748
4749 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4750 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 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_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4755 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4756 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4757 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4758
4759 bool is_illegal = false;
4760
4761 if (is_interface) {
4762 if (!is_public || !is_static || !is_final || is_private ||
4763 is_protected || is_volatile || is_transient ||
4764 (major_gte_15 && is_enum)) {
4765 is_illegal = true;
4766 }
4767 } else { // not interface
4768 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4769 is_illegal = true;
4770 }
4771 }
4772
4773 if (is_illegal) {
4774 ResourceMark rm(THREAD);
4775 Exceptions::fthrow(
4776 THREAD_AND_LOCATION,
4777 vmSymbols::java_lang_ClassFormatError(),
4778 "Illegal field modifiers in class %s: 0x%X",
4779 _class_name->as_C_string(), flags);
4780 return;
4781 }
4782 }
4783
4784 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4785 bool is_interface,
4786 const Symbol* name,
4787 TRAPS) const {
4788 if (!_need_verify) { return; }
4789
4790 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4791 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4792 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4793 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4794 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4795 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4796 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4797 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4798 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4799 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4800 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4801 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4802 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4803
4804 bool is_illegal = false;
4805
4806 if (is_interface) {
4807 if (major_gte_8) {
4808 // Class file version is JAVA_8_VERSION or later Methods of
4809 // interfaces may set any of the flags except ACC_PROTECTED,
4810 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4811 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4812 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4813 (is_native || is_protected || is_final || is_synchronized) ||
4814 // If a specific method of a class or interface has its
4815 // ACC_ABSTRACT flag set, it must not have any of its
4816 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4817 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4818 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4819 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4820 (is_abstract && (is_private || is_static || is_strict))) {
4821 is_illegal = true;
4822 }
4823 } else if (major_gte_15) {
4824 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4825 if (!is_public || is_private || is_protected || is_static || is_final ||
4826 is_synchronized || is_native || !is_abstract || is_strict) {
4827 is_illegal = true;
4828 }
4829 } else {
4830 // Class file version is pre-JAVA_1_5_VERSION
4831 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4832 is_illegal = true;
4833 }
4834 }
4835 } else { // not interface
4836 if (has_illegal_visibility(flags)) {
4837 is_illegal = true;
4838 } else {
4839 if (is_initializer) {
4840 if (is_static || is_final || is_synchronized || is_native ||
4841 is_abstract || (major_gte_15 && is_bridge)) {
4842 is_illegal = true;
4843 }
4844 } else { // not initializer
4845 if (is_abstract) {
4846 if ((is_final || is_native || is_private || is_static ||
4847 (major_gte_15 && (is_synchronized || is_strict)))) {
4848 is_illegal = true;
4849 }
4850 }
4851 }
4852 }
4853 }
4854
4855 if (is_illegal) {
4856 ResourceMark rm(THREAD);
4857 Exceptions::fthrow(
4858 THREAD_AND_LOCATION,
4859 vmSymbols::java_lang_ClassFormatError(),
4860 "Method %s in class %s has illegal modifiers: 0x%X",
4861 name->as_C_string(), _class_name->as_C_string(), flags);
4862 return;
4863 }
4864 }
4865
4866 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4867 int length,
4868 TRAPS) const {
4869 assert(_need_verify, "only called when _need_verify is true");
4870 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
4871 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4872 }
4873 }
4874
4875 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4876 // In class names, '/' separates unqualified names. This is verified in this function also.
4877 // Method names also may not contain the characters '<' or '>', unless <init>
4878 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4879 // method. Because these names have been checked as special cases before
4880 // calling this method in verify_legal_method_name.
4881 //
4882 // This method is also called from the modular system APIs in modules.cpp
4883 // to verify the validity of module and package names.
4884 bool ClassFileParser::verify_unqualified_name(const char* name,
4885 unsigned int length,
4886 int type) {
4887 for (const char* p = name; p != name + length;) {
4888 jchar ch = *p;
4889 if (ch < 128) {
4890 if (ch == '.' || ch == ';' || ch == '[' ) {
4891 return false; // do not permit '.', ';', or '['
4892 }
4893 if (ch == '/') {
4894 // check for '//' or leading or trailing '/' which are not legal
4895 // unqualified name must not be empty
4896 if (type == ClassFileParser::LegalClass) {
4897 if (p == name || p+1 >= name+length || *(p+1) == '/') {
4898 return false;
4899 }
4900 } else {
4901 return false; // do not permit '/' unless it's class name
4902 }
4903 }
4904 if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) {
4905 return false; // do not permit '<' or '>' in method names
4906 }
4907 p++;
4908 } else {
4909 char* tmp_p = UTF8::next(p, &ch);
4910 p = tmp_p;
4911 }
4912 }
4913 return true;
4914 }
4915
4916 // Take pointer to a string. Skip over the longest part of the string that could
4917 // be taken as a fieldname. Allow '/' if slash_ok is true.
4918 // Return a pointer to just past the fieldname.
4919 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4920 // being true, we saw consecutive slashes (meaning we were looking for a
4921 // qualified path but found something that was badly-formed).
4922 static const char* skip_over_field_name(const char* name,
4923 bool slash_ok,
4924 unsigned int length) {
4925 const char* p;
4926 jboolean last_is_slash = false;
4927 jboolean not_first_ch = false;
4928
4929 for (p = name; p != name + length; not_first_ch = true) {
4930 const char* old_p = p;
4931 jchar ch = *p;
4932 if (ch < 128) {
4933 p++;
4934 // quick check for ascii
4935 if ((ch >= 'a' && ch <= 'z') ||
4936 (ch >= 'A' && ch <= 'Z') ||
4937 (ch == '_' || ch == '$') ||
4938 (not_first_ch && ch >= '0' && ch <= '9')) {
4939 last_is_slash = false;
4940 continue;
4941 }
4942 if (slash_ok && ch == '/') {
4943 if (last_is_slash) {
4944 return NULL; // Don't permit consecutive slashes
4945 }
4946 last_is_slash = true;
4947 continue;
4948 }
4949 }
4950 else {
4951 jint unicode_ch;
4952 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4953 p = tmp_p;
4954 last_is_slash = false;
4955 // Check if ch is Java identifier start or is Java identifier part
4956 // 4672820: call java.lang.Character methods directly without generating separate tables.
4957 EXCEPTION_MARK;
4958
4959 // return value
4960 JavaValue result(T_BOOLEAN);
4961 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4962 JavaCallArguments args;
4963 args.push_int(unicode_ch);
4964
4965 // public static boolean isJavaIdentifierStart(char ch);
4966 JavaCalls::call_static(&result,
4967 SystemDictionary::Character_klass(),
4968 vmSymbols::isJavaIdentifierStart_name(),
4969 vmSymbols::int_bool_signature(),
4970 &args,
4971 THREAD);
4972
4973 if (HAS_PENDING_EXCEPTION) {
4974 CLEAR_PENDING_EXCEPTION;
4975 return 0;
4976 }
4977 if (result.get_jboolean()) {
4978 continue;
4979 }
4980
4981 if (not_first_ch) {
4982 // public static boolean isJavaIdentifierPart(char ch);
4983 JavaCalls::call_static(&result,
4984 SystemDictionary::Character_klass(),
4985 vmSymbols::isJavaIdentifierPart_name(),
4986 vmSymbols::int_bool_signature(),
4987 &args,
4988 THREAD);
4989
4990 if (HAS_PENDING_EXCEPTION) {
4991 CLEAR_PENDING_EXCEPTION;
4992 return 0;
4993 }
4994
4995 if (result.get_jboolean()) {
4996 continue;
4997 }
4998 }
4999 }
5000 return (not_first_ch) ? old_p : NULL;
5001 }
5002 return (not_first_ch) ? p : NULL;
5003 }
5004
5005 // Take pointer to a string. Skip over the longest part of the string that could
5006 // be taken as a field signature. Allow "void" if void_ok.
5007 // Return a pointer to just past the signature.
5008 // Return NULL if no legal signature is found.
5009 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5010 bool void_ok,
5011 unsigned int length,
5012 TRAPS) const {
5013 unsigned int array_dim = 0;
5014 while (length > 0) {
5015 switch (signature[0]) {
5016 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5017 case JVM_SIGNATURE_BOOLEAN:
5018 case JVM_SIGNATURE_BYTE:
5019 case JVM_SIGNATURE_CHAR:
5020 case JVM_SIGNATURE_SHORT:
5021 case JVM_SIGNATURE_INT:
5022 case JVM_SIGNATURE_FLOAT:
5023 case JVM_SIGNATURE_LONG:
5024 case JVM_SIGNATURE_DOUBLE:
5025 return signature + 1;
5026 case JVM_SIGNATURE_CLASS: {
5027 if (_major_version < JAVA_1_5_VERSION) {
5028 // Skip over the class name if one is there
5029 const char* const p = skip_over_field_name(signature + 1, true, --length);
5030
5031 // The next character better be a semicolon
5032 if (p && (p - signature) > 1 && p[0] == ';') {
5033 return p + 1;
5034 }
5035 }
5036 else {
5037 // Skip leading 'L' and ignore first appearance of ';'
5038 length--;
5039 signature++;
5040 char* c = strchr((char*) signature, ';');
5041 // Format check signature
5042 if (c != NULL) {
5043 ResourceMark rm(THREAD);
5044 int newlen = c - (char*) signature;
5045 char* sig = NEW_RESOURCE_ARRAY(char, newlen + 1);
5046 strncpy(sig, signature, newlen);
5047 sig[newlen] = '\0';
5048
5049 bool legal = verify_unqualified_name(sig, newlen, LegalClass);
5050 if (!legal) {
5051 classfile_parse_error("Class name contains illegal character "
5052 "in descriptor in class file %s",
5053 CHECK_0);
5054 return NULL;
5055 }
5056 return signature + newlen + 1;
5057 }
5058 }
5059 return NULL;
5060 }
5061 case JVM_SIGNATURE_ARRAY:
5062 array_dim++;
5063 if (array_dim > 255) {
5064 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5065 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5066 }
5067 // The rest of what's there better be a legal signature
5068 signature++;
5069 length--;
5070 void_ok = false;
5071 break;
5072 default:
5073 return NULL;
5074 }
5075 }
5076 return NULL;
5077 }
5078
5079 // Checks if name is a legal class name.
5080 void ClassFileParser::verify_legal_class_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 const char* p;
5090 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5091 p = skip_over_field_signature(bytes, false, length, CHECK);
5092 legal = (p != NULL) && ((p - bytes) == (int)length);
5093 } else if (_major_version < JAVA_1_5_VERSION) {
5094 if (bytes[0] != '<') {
5095 p = skip_over_field_name(bytes, true, length);
5096 legal = (p != NULL) && ((p - bytes) == (int)length);
5097 }
5098 } else {
5099 // 4900761: relax the constraints based on JSR202 spec
5100 // Class names may be drawn from the entire Unicode character set.
5101 // Identifiers between '/' must be unqualified names.
5102 // The utf8 string has been verified when parsing cpool entries.
5103 legal = verify_unqualified_name(bytes, length, LegalClass);
5104 }
5105 }
5106 if (!legal) {
5107 ResourceMark rm(THREAD);
5108 assert(_class_name != NULL, "invariant");
5109 Exceptions::fthrow(
5110 THREAD_AND_LOCATION,
5111 vmSymbols::java_lang_ClassFormatError(),
5112 "Illegal class name \"%s\" in class file %s", bytes,
5113 _class_name->as_C_string()
5114 );
5115 return;
5116 }
5117 }
5118
5119 // Checks if name is a legal field name.
5120 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5121 if (!_need_verify || _relax_verify) { return; }
5122
5123 char buf[fixed_buffer_size];
5124 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5125 unsigned int length = name->utf8_length();
5126 bool legal = false;
5127
5128 if (length > 0) {
5129 if (_major_version < JAVA_1_5_VERSION) {
5130 if (bytes[0] != '<') {
5131 const char* p = skip_over_field_name(bytes, false, length);
5132 legal = (p != NULL) && ((p - bytes) == (int)length);
5133 }
5134 } else {
5135 // 4881221: relax the constraints based on JSR202 spec
5136 legal = verify_unqualified_name(bytes, length, LegalField);
5137 }
5138 }
5139
5140 if (!legal) {
5141 ResourceMark rm(THREAD);
5142 assert(_class_name != NULL, "invariant");
5143 Exceptions::fthrow(
5144 THREAD_AND_LOCATION,
5145 vmSymbols::java_lang_ClassFormatError(),
5146 "Illegal field name \"%s\" in class %s", bytes,
5147 _class_name->as_C_string()
5148 );
5149 return;
5150 }
5151 }
5152
5153 // Checks if name is a legal method name.
5154 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5155 if (!_need_verify || _relax_verify) { return; }
5156
5157 assert(name != NULL, "method name is null");
5158 char buf[fixed_buffer_size];
5159 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5160 unsigned int length = name->utf8_length();
5161 bool legal = false;
5162
5163 if (length > 0) {
5164 if (bytes[0] == '<') {
5165 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5166 legal = true;
5167 }
5168 } else if (_major_version < JAVA_1_5_VERSION) {
5169 const char* p;
5170 p = skip_over_field_name(bytes, false, length);
5171 legal = (p != NULL) && ((p - bytes) == (int)length);
5172 } else {
5173 // 4881221: relax the constraints based on JSR202 spec
5174 legal = verify_unqualified_name(bytes, length, LegalMethod);
5175 }
5176 }
5177
5178 if (!legal) {
5179 ResourceMark rm(THREAD);
5180 assert(_class_name != NULL, "invariant");
5181 Exceptions::fthrow(
5182 THREAD_AND_LOCATION,
5183 vmSymbols::java_lang_ClassFormatError(),
5184 "Illegal method name \"%s\" in class %s", bytes,
5185 _class_name->as_C_string()
5186 );
5187 return;
5188 }
5189 }
5190
5191
5192 // Checks if signature is a legal field signature.
5193 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5194 const Symbol* signature,
5195 TRAPS) const {
5196 if (!_need_verify) { return; }
5197
5198 char buf[fixed_buffer_size];
5199 const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5200 const unsigned int length = signature->utf8_length();
5201 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5202
5203 if (p == NULL || (p - bytes) != (int)length) {
5204 throwIllegalSignature("Field", name, signature, CHECK);
5205 }
5206 }
5207
5208 // Checks if signature is a legal method signature.
5209 // Returns number of parameters
5210 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5211 const Symbol* signature,
5212 TRAPS) const {
5213 if (!_need_verify) {
5214 // make sure caller's args_size will be less than 0 even for non-static
5215 // method so it will be recomputed in compute_size_of_parameters().
5216 return -2;
5217 }
5218
5219 // Class initializers cannot have args for class format version >= 51.
5220 if (name == vmSymbols::class_initializer_name() &&
5221 signature != vmSymbols::void_method_signature() &&
5222 _major_version >= JAVA_7_VERSION) {
5223 throwIllegalSignature("Method", name, signature, CHECK_0);
5224 return 0;
5225 }
5226
5227 unsigned int args_size = 0;
5228 char buf[fixed_buffer_size];
5229 const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5230 unsigned int length = signature->utf8_length();
5231 const char* nextp;
5232
5233 // The first character must be a '('
5234 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5235 length--;
5236 // Skip over legal field signatures
5237 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5238 while ((length > 0) && (nextp != NULL)) {
5239 args_size++;
5240 if (p[0] == 'J' || p[0] == 'D') {
5241 args_size++;
5242 }
5243 length -= nextp - p;
5244 p = nextp;
5245 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5246 }
5247 // The first non-signature thing better be a ')'
5248 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5249 length--;
5250 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5251 // All internal methods must return void
5252 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5253 return args_size;
5254 }
5255 } else {
5256 // Now we better just have a return value
5257 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5258 if (nextp && ((int)length == (nextp - p))) {
5259 return args_size;
5260 }
5261 }
5262 }
5263 }
5264 // Report error
5265 throwIllegalSignature("Method", name, signature, CHECK_0);
5266 return 0;
5267 }
5268
5269 int ClassFileParser::static_field_size() const {
5270 assert(_field_info != NULL, "invariant");
5271 return _field_info->static_field_size;
5272 }
5273
5274 int ClassFileParser::total_oop_map_count() const {
5275 assert(_field_info != NULL, "invariant");
5276 return _field_info->total_oop_map_count;
5277 }
5278
5279 jint ClassFileParser::layout_size() const {
5280 assert(_field_info != NULL, "invariant");
5281 return _field_info->instance_size;
5282 }
5283
5284 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5285 const Array<Method*>* methods) {
5286 assert(ik != NULL, "invariant");
5287 assert(methods != NULL, "invariant");
5288
5289 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5290 // (We used to do this lazily, but now we query it in Rewriter,
5291 // which is eagerly done for every method, so we might as well do it now,
5292 // when everything is fresh in memory.)
5293 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5294
5295 if (klass_id != vmSymbols::NO_SID) {
5296 for (int j = 0; j < methods->length(); ++j) {
5297 Method* method = methods->at(j);
5298 method->init_intrinsic_id();
5299
5300 if (CheckIntrinsics) {
5301 // Check if an intrinsic is defined for method 'method',
5302 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5303 if (method->intrinsic_id() != vmIntrinsics::_none &&
5304 !method->intrinsic_candidate()) {
5305 tty->print("Compiler intrinsic is defined for method [%s], "
5306 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5307 method->name_and_sig_as_C_string(),
5308 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5309 );
5310 tty->cr();
5311 DEBUG_ONLY(vm_exit(1));
5312 }
5313 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5314 // but there is no intrinsic available for it.
5315 if (method->intrinsic_candidate() &&
5316 method->intrinsic_id() == vmIntrinsics::_none) {
5317 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5318 "but no compiler intrinsic is defined for the method.%s",
5319 method->name_and_sig_as_C_string(),
5320 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5321 );
5322 tty->cr();
5323 DEBUG_ONLY(vm_exit(1));
5324 }
5325 }
5326 } // end for
5327
5328 #ifdef ASSERT
5329 if (CheckIntrinsics) {
5330 // Check for orphan methods in the current class. A method m
5331 // of a class C is orphan if an intrinsic is defined for method m,
5332 // but class C does not declare m.
5333 // The check is potentially expensive, therefore it is available
5334 // only in debug builds.
5335
5336 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5337 if (vmIntrinsics::_compiledLambdaForm == id) {
5338 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5339 // generated for the JVM from a LambdaForm and therefore no method
5340 // is defined for it.
5341 continue;
5342 }
5343
5344 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5345 // Check if the current class contains a method with the same
5346 // name, flags, signature.
5347 bool match = false;
5348 for (int j = 0; j < methods->length(); ++j) {
5349 const Method* method = methods->at(j);
5350 if (method->intrinsic_id() == id) {
5351 match = true;
5352 break;
5353 }
5354 }
5355
5356 if (!match) {
5357 char buf[1000];
5358 tty->print("Compiler intrinsic is defined for method [%s], "
5359 "but the method is not available in class [%s].%s",
5360 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5361 buf, sizeof(buf)),
5362 ik->name()->as_C_string(),
5363 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5364 );
5365 tty->cr();
5366 DEBUG_ONLY(vm_exit(1));
5367 }
5368 }
5369 } // end for
5370 } // CheckIntrinsics
5371 #endif // ASSERT
5372 }
5373 }
5374
5375 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5376 if (_klass != NULL) {
5377 return _klass;
5378 }
5379
5380 InstanceKlass* const ik =
5381 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5382
5383 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5384
5385 assert(_klass == ik, "invariant");
5386
5387 ik->set_has_passed_fingerprint_check(false);
5388 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5389 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5390 if (aot_fp != 0 && aot_fp == _stream->compute_fingerprint()) {
5391 // This class matches with a class saved in an AOT library
5392 ik->set_has_passed_fingerprint_check(true);
5393 } else {
5394 ResourceMark rm;
5395 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5396 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5397 }
5398 }
5399
5400 return ik;
5401 }
5402
5403 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5404 assert(ik != NULL, "invariant");
5405
5406 set_klass_to_deallocate(ik);
5407
5408 assert(_field_info != NULL, "invariant");
5409 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5410 assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count,
5411 "sanity");
5412
5413 assert(ik->is_instance_klass(), "sanity");
5414 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5415
5416 // Fill in information already parsed
5417 ik->set_should_verify_class(_need_verify);
5418
5419 // Not yet: supers are done below to support the new subtype-checking fields
5420 ik->set_class_loader_data(_loader_data);
5421 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5422 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5423 assert(_fac != NULL, "invariant");
5424 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5425
5426 // this transfers ownership of a lot of arrays from
5427 // the parser onto the InstanceKlass*
5428 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5429
5430 // note that is not safe to use the fields in the parser from this point on
5431 assert(NULL == _cp, "invariant");
5432 assert(NULL == _fields, "invariant");
5433 assert(NULL == _methods, "invariant");
5434 assert(NULL == _inner_classes, "invariant");
5435 assert(NULL == _nest_members, "invariant");
5436 assert(NULL == _local_interfaces, "invariant");
5437 assert(NULL == _transitive_interfaces, "invariant");
5438 assert(NULL == _combined_annotations, "invariant");
5439
5440 if (_has_final_method) {
5441 ik->set_has_final_method();
5442 }
5443
5444 ik->copy_method_ordering(_method_ordering, CHECK);
5445 // The InstanceKlass::_methods_jmethod_ids cache
5446 // is managed on the assumption that the initial cache
5447 // size is equal to the number of methods in the class. If
5448 // that changes, then InstanceKlass::idnum_can_increment()
5449 // has to be changed accordingly.
5450 ik->set_initial_method_idnum(ik->methods()->length());
5451
5452 ik->set_name(_class_name);
5453
5454 if (is_anonymous()) {
5455 // _this_class_index is a CONSTANT_Class entry that refers to this
5456 // anonymous class itself. If this class needs to refer to its own methods or
5457 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5458 // _this_class_index. However, because this class is anonymous (it's
5459 // not stored in SystemDictionary), _this_class_index cannot be resolved
5460 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5461 // Therefore, we must eagerly resolve _this_class_index now.
5462 ik->constants()->klass_at_put(_this_class_index, ik);
5463 }
5464
5465 ik->set_minor_version(_minor_version);
5466 ik->set_major_version(_major_version);
5467 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5468 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5469
5470 if (_host_klass != NULL) {
5471 assert (ik->is_anonymous(), "should be the same");
5472 ik->set_host_klass(_host_klass);
5473 }
5474
5475 // Set PackageEntry for this_klass
5476 oop cl = ik->class_loader();
5477 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5478 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5479 ik->set_package(cld, CHECK);
5480
5481 const Array<Method*>* const methods = ik->methods();
5482 assert(methods != NULL, "invariant");
5483 const int methods_len = methods->length();
5484
5485 check_methods_for_intrinsics(ik, methods);
5486
5487 // Fill in field values obtained by parse_classfile_attributes
5488 if (_parsed_annotations->has_any_annotations()) {
5489 _parsed_annotations->apply_to(ik);
5490 }
5491
5492 apply_parsed_class_attributes(ik);
5493
5494 // Miranda methods
5495 if ((_num_miranda_methods > 0) ||
5496 // if this class introduced new miranda methods or
5497 (_super_klass != NULL && _super_klass->has_miranda_methods())
5498 // super class exists and this class inherited miranda methods
5499 ) {
5500 ik->set_has_miranda_methods(); // then set a flag
5501 }
5502
5503 // Fill in information needed to compute superclasses.
5504 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), CHECK);
5505
5506 // Initialize itable offset tables
5507 klassItable::setup_itable_offset_table(ik);
5508
5509 // Compute transitive closure of interfaces this class implements
5510 // Do final class setup
5511 fill_oop_maps(ik,
5512 _field_info->nonstatic_oop_map_count,
5513 _field_info->nonstatic_oop_offsets,
5514 _field_info->nonstatic_oop_counts);
5515
5516 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5517 set_precomputed_flags(ik);
5518
5519 // check if this class can access its super class
5520 check_super_class_access(ik, CHECK);
5521
5522 // check if this class can access its superinterfaces
5523 check_super_interface_access(ik, CHECK);
5524
5525 // check if this class overrides any final method
5526 check_final_method_override(ik, CHECK);
5527
5528 // reject static interface methods prior to Java 8
5529 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5530 check_illegal_static_method(ik, CHECK);
5531 }
5532
5533 // Obtain this_klass' module entry
5534 ModuleEntry* module_entry = ik->module();
5535 assert(module_entry != NULL, "module_entry should always be set");
5536
5537 // Obtain java.lang.Module
5538 Handle module_handle(THREAD, module_entry->module());
5539
5540 // Allocate mirror and initialize static fields
5541 // The create_mirror() call will also call compute_modifiers()
5542 java_lang_Class::create_mirror(ik,
5543 Handle(THREAD, _loader_data->class_loader()),
5544 module_handle,
5545 _protection_domain,
5546 CHECK);
5547
5548 assert(_all_mirandas != NULL, "invariant");
5549
5550 // Generate any default methods - default methods are public interface methods
5551 // that have a default implementation. This is new with Java 8.
5552 if (_has_nonstatic_concrete_methods) {
5553 DefaultMethods::generate_default_methods(ik,
5554 _all_mirandas,
5555 CHECK);
5556 }
5557
5558 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5559 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5560 !module_entry->has_default_read_edges()) {
5561 if (!module_entry->set_has_default_read_edges()) {
5562 // We won a potential race
5563 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5564 }
5565 }
5566
5567 // Update the loader_data graph.
5568 record_defined_class_dependencies(ik, CHECK);
5569
5570 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5571
5572 if (!is_internal()) {
5573 if (log_is_enabled(Info, class, load)) {
5574 ResourceMark rm;
5575 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5576 ik->print_class_load_logging(_loader_data, module_name, _stream);
5577 }
5578
5579 if (log_is_enabled(Debug, class, resolve)) {
5580 ResourceMark rm;
5581 // print out the superclass.
5582 const char * from = ik->external_name();
5583 if (ik->java_super() != NULL) {
5584 log_debug(class, resolve)("%s %s (super)",
5585 from,
5586 ik->java_super()->external_name());
5587 }
5588 // print out each of the interface classes referred to by this class.
5589 const Array<Klass*>* const local_interfaces = ik->local_interfaces();
5590 if (local_interfaces != NULL) {
5591 const int length = local_interfaces->length();
5592 for (int i = 0; i < length; i++) {
5593 const Klass* const k = local_interfaces->at(i);
5594 const char * to = k->external_name();
5595 log_debug(class, resolve)("%s %s (interface)", from, to);
5596 }
5597 }
5598 }
5599 }
5600
5601 TRACE_INIT_ID(ik);
5602
5603 // If we reach here, all is well.
5604 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5605 // in order for it to not be destroyed in the ClassFileParser destructor.
5606 set_klass_to_deallocate(NULL);
5607
5608 // it's official
5609 set_klass(ik);
5610
5611 debug_only(ik->verify();)
5612 }
5613
5614 // For an anonymous class that is in the unnamed package, move it to its host class's
5615 // package by prepending its host class's package name to its class name and setting
5616 // its _class_name field.
5617 void ClassFileParser::prepend_host_package_name(const InstanceKlass* host_klass, TRAPS) {
5618 ResourceMark rm(THREAD);
5619 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
5620 "Anonymous class should not be in a package");
5621 const char* host_pkg_name =
5622 ClassLoader::package_from_name(host_klass->name()->as_C_string(), NULL);
5623
5624 if (host_pkg_name != NULL) {
5625 size_t host_pkg_len = strlen(host_pkg_name);
5626 int class_name_len = _class_name->utf8_length();
5627 char* new_anon_name =
5628 NEW_RESOURCE_ARRAY(char, host_pkg_len + 1 + class_name_len);
5629 // Copy host package name and trailing /.
5630 strncpy(new_anon_name, host_pkg_name, host_pkg_len);
5631 new_anon_name[host_pkg_len] = '/';
5632 // Append anonymous class name. The anonymous class name can contain odd
5633 // characters. So, do a strncpy instead of using sprintf("%s...").
5634 strncpy(new_anon_name + host_pkg_len + 1, (char *)_class_name->base(), class_name_len);
5635
5636 // Create a symbol and update the anonymous class name.
5637 _class_name = SymbolTable::new_symbol(new_anon_name,
5638 (int)host_pkg_len + 1 + class_name_len,
5639 CHECK);
5640 }
5641 }
5642
5643 // If the host class and the anonymous class are in the same package then do
5644 // nothing. If the anonymous class is in the unnamed package then move it to its
5645 // host's package. If the classes are in different packages then throw an IAE
5646 // exception.
5647 void ClassFileParser::fix_anonymous_class_name(TRAPS) {
5648 assert(_host_klass != NULL, "Expected an anonymous class");
5649
5650 const jbyte* anon_last_slash = UTF8::strrchr(_class_name->base(),
5651 _class_name->utf8_length(), '/');
5652 if (anon_last_slash == NULL) { // Unnamed package
5653 prepend_host_package_name(_host_klass, CHECK);
5654 } else {
5655 if (!_host_klass->is_same_class_package(_host_klass->class_loader(), _class_name)) {
5656 ResourceMark rm(THREAD);
5657 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
5658 err_msg("Host class %s and anonymous class %s are in different packages",
5659 _host_klass->name()->as_C_string(), _class_name->as_C_string()));
5660 }
5661 }
5662 }
5663
5664 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5665 bool trusted = (loader_data->is_the_null_class_loader_data() ||
5666 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
5667 bool need_verify =
5668 // verifyAll
5669 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5670 // verifyRemote
5671 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5672 return !need_verify;
5673 }
5674
5675 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5676 Symbol* name,
5677 ClassLoaderData* loader_data,
5678 Handle protection_domain,
5679 const InstanceKlass* host_klass,
5680 GrowableArray<Handle>* cp_patches,
5681 Publicity pub_level,
5682 TRAPS) :
5683 _stream(stream),
5684 _requested_name(name),
5685 _loader_data(loader_data),
5686 _host_klass(host_klass),
5687 _cp_patches(cp_patches),
5688 _num_patched_klasses(0),
5689 _max_num_patched_klasses(0),
5690 _orig_cp_size(0),
5691 _first_patched_klass_resolved_index(0),
5692 _super_klass(),
5693 _cp(NULL),
5694 _fields(NULL),
5695 _methods(NULL),
5696 _inner_classes(NULL),
5697 _nest_members(NULL),
5698 _nest_host(0),
5699 _local_interfaces(NULL),
5700 _transitive_interfaces(NULL),
5701 _combined_annotations(NULL),
5702 _annotations(NULL),
5703 _type_annotations(NULL),
5704 _fields_annotations(NULL),
5705 _fields_type_annotations(NULL),
5706 _klass(NULL),
5707 _klass_to_deallocate(NULL),
5708 _parsed_annotations(NULL),
5709 _fac(NULL),
5710 _field_info(NULL),
5711 _method_ordering(NULL),
5712 _all_mirandas(NULL),
5713 _vtable_size(0),
5714 _itable_size(0),
5715 _num_miranda_methods(0),
5716 _rt(REF_NONE),
5717 _protection_domain(protection_domain),
5718 _access_flags(),
5719 _pub_level(pub_level),
5720 _bad_constant_seen(0),
5721 _synthetic_flag(false),
5722 _sde_length(false),
5723 _sde_buffer(NULL),
5724 _sourcefile_index(0),
5725 _generic_signature_index(0),
5726 _major_version(0),
5727 _minor_version(0),
5728 _this_class_index(0),
5729 _super_class_index(0),
5730 _itfs_len(0),
5731 _java_fields_count(0),
5732 _need_verify(false),
5733 _relax_verify(false),
5734 _has_nonstatic_concrete_methods(false),
5735 _declares_nonstatic_concrete_methods(false),
5736 _has_final_method(false),
5737 _has_finalizer(false),
5738 _has_empty_finalizer(false),
5739 _has_vanilla_constructor(false),
5740 _max_bootstrap_specifier_index(-1) {
5741
5742 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
5743
5744 assert(THREAD->is_Java_thread(), "invariant");
5745 assert(_loader_data != NULL, "invariant");
5746 assert(stream != NULL, "invariant");
5747 assert(_stream != NULL, "invariant");
5748 assert(_stream->buffer() == _stream->current(), "invariant");
5749 assert(_class_name != NULL, "invariant");
5750 assert(0 == _access_flags.as_int(), "invariant");
5751
5752 // Figure out whether we can skip format checking (matching classic VM behavior)
5753 if (DumpSharedSpaces) {
5754 // verify == true means it's a 'remote' class (i.e., non-boot class)
5755 // Verification decision is based on BytecodeVerificationRemote flag
5756 // for those classes.
5757 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
5758 BytecodeVerificationLocal;
5759 }
5760 else {
5761 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
5762 stream->need_verify());
5763 }
5764 if (_cp_patches != NULL) {
5765 int len = _cp_patches->length();
5766 for (int i=0; i<len; i++) {
5767 if (has_cp_patch_at(i)) {
5768 Handle patch = cp_patch_at(i);
5769 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
5770 // We need to append the names of the patched classes to the end of the constant pool,
5771 // because a patched class may have a Utf8 name that's not already included in the
5772 // original constant pool. These class names are used when patch_constant_pool()
5773 // calls patch_class().
5774 //
5775 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
5776 // At this point, we don't know the tag for index i yet, because we haven't parsed the
5777 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
5778 _max_num_patched_klasses++;
5779 }
5780 }
5781 }
5782 }
5783
5784 // synch back verification state to stream
5785 stream->set_verify(_need_verify);
5786
5787 // Check if verification needs to be relaxed for this class file
5788 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
5789 _relax_verify = relax_format_check_for(_loader_data);
5790
5791 parse_stream(stream, CHECK);
5792
5793 post_process_parsed_stream(stream, _cp, CHECK);
5794 }
5795
5796 void ClassFileParser::clear_class_metadata() {
5797 // metadata created before the instance klass is created. Must be
5798 // deallocated if classfile parsing returns an error.
5799 _cp = NULL;
5800 _fields = NULL;
5801 _methods = NULL;
5802 _inner_classes = NULL;
5803 _nest_members = NULL;
5804 _local_interfaces = NULL;
5805 _transitive_interfaces = NULL;
5806 _combined_annotations = NULL;
5807 _annotations = _type_annotations = NULL;
5808 _fields_annotations = _fields_type_annotations = NULL;
5809 }
5810
5811 // Destructor to clean up
5812 ClassFileParser::~ClassFileParser() {
5813 if (_cp != NULL) {
5814 MetadataFactory::free_metadata(_loader_data, _cp);
5815 }
5816 if (_fields != NULL) {
5817 MetadataFactory::free_array<u2>(_loader_data, _fields);
5818 }
5819
5820 if (_methods != NULL) {
5821 // Free methods
5822 InstanceKlass::deallocate_methods(_loader_data, _methods);
5823 }
5824
5825 // beware of the Universe::empty_blah_array!!
5826 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
5827 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5828 }
5829
5830 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
5831 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5832 }
5833
5834 // Free interfaces
5835 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5836 _local_interfaces, _transitive_interfaces);
5837
5838 if (_combined_annotations != NULL) {
5839 // After all annotations arrays have been created, they are installed into the
5840 // Annotations object that will be assigned to the InstanceKlass being created.
5841
5842 // Deallocate the Annotations object and the installed annotations arrays.
5843 _combined_annotations->deallocate_contents(_loader_data);
5844
5845 // If the _combined_annotations pointer is non-NULL,
5846 // then the other annotations fields should have been cleared.
5847 assert(_annotations == NULL, "Should have been cleared");
5848 assert(_type_annotations == NULL, "Should have been cleared");
5849 assert(_fields_annotations == NULL, "Should have been cleared");
5850 assert(_fields_type_annotations == NULL, "Should have been cleared");
5851 } else {
5852 // If the annotations arrays were not installed into the Annotations object,
5853 // then they have to be deallocated explicitly.
5854 MetadataFactory::free_array<u1>(_loader_data, _annotations);
5855 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
5856 Annotations::free_contents(_loader_data, _fields_annotations);
5857 Annotations::free_contents(_loader_data, _fields_type_annotations);
5858 }
5859
5860 clear_class_metadata();
5861
5862 // deallocate the klass if already created. Don't directly deallocate, but add
5863 // to the deallocate list so that the klass is removed from the CLD::_klasses list
5864 // at a safepoint.
5865 if (_klass_to_deallocate != NULL) {
5866 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5867 }
5868 }
5869
5870 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5871 TRAPS) {
5872
5873 assert(stream != NULL, "invariant");
5874 assert(_class_name != NULL, "invariant");
5875
5876 // BEGIN STREAM PARSING
5877 stream->guarantee_more(8, CHECK); // magic, major, minor
5878 // Magic value
5879 const u4 magic = stream->get_u4_fast();
5880 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5881 "Incompatible magic value %u in class file %s",
5882 magic, CHECK);
5883
5884 // Version numbers
5885 _minor_version = stream->get_u2_fast();
5886 _major_version = stream->get_u2_fast();
5887
5888 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) {
5889 ResourceMark rm;
5890 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
5891 _major_version, _minor_version, _class_name->as_C_string());
5892 Exceptions::fthrow(
5893 THREAD_AND_LOCATION,
5894 vmSymbols::java_lang_UnsupportedClassVersionError(),
5895 "Unsupported major.minor version for dump time %u.%u",
5896 _major_version,
5897 _minor_version);
5898 }
5899
5900 // Check version numbers - we check this even with verifier off
5901 if (!is_supported_version(_major_version, _minor_version)) {
5902 ResourceMark rm(THREAD);
5903 Exceptions::fthrow(
5904 THREAD_AND_LOCATION,
5905 vmSymbols::java_lang_UnsupportedClassVersionError(),
5906 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5907 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
5908 _class_name->as_C_string(),
5909 _major_version,
5910 _minor_version,
5911 JVM_CLASSFILE_MAJOR_VERSION,
5912 JVM_CLASSFILE_MINOR_VERSION);
5913 return;
5914 }
5915
5916 stream->guarantee_more(3, CHECK); // length, first cp tag
5917 u2 cp_size = stream->get_u2_fast();
5918
5919 guarantee_property(
5920 cp_size >= 1, "Illegal constant pool size %u in class file %s",
5921 cp_size, CHECK);
5922
5923 _orig_cp_size = cp_size;
5924 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
5925 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
5926 }
5927 cp_size += _max_num_patched_klasses;
5928
5929 _cp = ConstantPool::allocate(_loader_data,
5930 cp_size,
5931 CHECK);
5932
5933 ConstantPool* const cp = _cp;
5934
5935 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5936
5937 assert(cp_size == (const u2)cp->length(), "invariant");
5938
5939 // ACCESS FLAGS
5940 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5941
5942 // Access flags
5943 jint flags;
5944 // JVM_ACC_MODULE is defined in JDK-9 and later.
5945 if (_major_version >= JAVA_9_VERSION) {
5946 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5947 } else {
5948 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5949 }
5950
5951 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5952 // Set abstract bit for old class files for backward compatibility
5953 flags |= JVM_ACC_ABSTRACT;
5954 }
5955
5956 verify_legal_class_modifiers(flags, CHECK);
5957
5958 short bad_constant = class_bad_constant_seen();
5959 if (bad_constant != 0) {
5960 // Do not throw CFE until after the access_flags are checked because if
5961 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5962 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
5963 }
5964
5965 _access_flags.set_flags(flags);
5966
5967 // This class and superclass
5968 _this_class_index = stream->get_u2_fast();
5969 check_property(
5970 valid_cp_range(_this_class_index, cp_size) &&
5971 cp->tag_at(_this_class_index).is_unresolved_klass(),
5972 "Invalid this class index %u in constant pool in class file %s",
5973 _this_class_index, CHECK);
5974
5975 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5976 assert(class_name_in_cp != NULL, "class_name can't be null");
5977
5978 // Update _class_name which could be null previously
5979 // to reflect the name in the constant pool
5980 _class_name = class_name_in_cp;
5981
5982 // Don't need to check whether this class name is legal or not.
5983 // It has been checked when constant pool is parsed.
5984 // However, make sure it is not an array type.
5985 if (_need_verify) {
5986 guarantee_property(_class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
5987 "Bad class name in class file %s",
5988 CHECK);
5989 }
5990
5991 // Checks if name in class file matches requested name
5992 if (_requested_name != NULL && _requested_name != _class_name) {
5993 ResourceMark rm(THREAD);
5994 Exceptions::fthrow(
5995 THREAD_AND_LOCATION,
5996 vmSymbols::java_lang_NoClassDefFoundError(),
5997 "%s (wrong name: %s)",
5998 _class_name->as_C_string(),
5999 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6000 );
6001 return;
6002 }
6003
6004 // if this is an anonymous class fix up its name if it's in the unnamed
6005 // package. Otherwise, throw IAE if it is in a different package than
6006 // its host class.
6007 if (_host_klass != NULL) {
6008 fix_anonymous_class_name(CHECK);
6009 }
6010
6011 // Verification prevents us from creating names with dots in them, this
6012 // asserts that that's the case.
6013 assert(is_internal_format(_class_name), "external class name format used internally");
6014
6015 if (!is_internal()) {
6016 LogTarget(Debug, class, preorder) lt;
6017 if (lt.is_enabled()){
6018 ResourceMark rm(THREAD);
6019 LogStream ls(lt);
6020 ls.print("%s", _class_name->as_klass_external_name());
6021 if (stream->source() != NULL) {
6022 ls.print(" source: %s", stream->source());
6023 }
6024 ls.cr();
6025 }
6026
6027 #if INCLUDE_CDS
6028 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6029 if (!ClassLoader::has_jrt_entry()) {
6030 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6031 DumpLoadedClassList = NULL;
6032 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6033 _host_klass == NULL) {
6034 // Only dump the classes that can be stored into CDS archive.
6035 // Anonymous classes such as generated LambdaForm classes are also not included.
6036 oop class_loader = _loader_data->class_loader();
6037 ResourceMark rm(THREAD);
6038 bool skip = false;
6039 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6040 // For the boot and platform class loaders, skip classes that are not found in the
6041 // java runtime image, such as those found in the --patch-module entries.
6042 // These classes can't be loaded from the archive during runtime.
6043 if (!ClassLoader::is_modules_image(stream->source()) && strncmp(stream->source(), "jrt:", 4) != 0) {
6044 skip = true;
6045 }
6046
6047 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6048 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6049 // as they can be loaded from the archive during runtime.
6050 skip = false;
6051 }
6052 }
6053 if (skip) {
6054 tty->print_cr("skip writing class %s from source %s to classlist file",
6055 _class_name->as_C_string(), stream->source());
6056 } else {
6057 classlist_file->print_cr("%s", _class_name->as_C_string());
6058 classlist_file->flush();
6059 }
6060 }
6061 }
6062 #endif
6063 }
6064
6065 // SUPERKLASS
6066 _super_class_index = stream->get_u2_fast();
6067 _super_klass = parse_super_class(cp,
6068 _super_class_index,
6069 _need_verify,
6070 CHECK);
6071
6072 // Interfaces
6073 _itfs_len = stream->get_u2_fast();
6074 parse_interfaces(stream,
6075 _itfs_len,
6076 cp,
6077 &_has_nonstatic_concrete_methods,
6078 CHECK);
6079
6080 assert(_local_interfaces != NULL, "invariant");
6081
6082 // Fields (offsets are filled in later)
6083 _fac = new FieldAllocationCount();
6084 parse_fields(stream,
6085 _access_flags.is_interface(),
6086 _fac,
6087 cp,
6088 cp_size,
6089 &_java_fields_count,
6090 CHECK);
6091
6092 assert(_fields != NULL, "invariant");
6093
6094 // Methods
6095 AccessFlags promoted_flags;
6096 parse_methods(stream,
6097 _access_flags.is_interface(),
6098 &promoted_flags,
6099 &_has_final_method,
6100 &_declares_nonstatic_concrete_methods,
6101 CHECK);
6102
6103 assert(_methods != NULL, "invariant");
6104
6105 // promote flags from parse_methods() to the klass' flags
6106 _access_flags.add_promoted_flags(promoted_flags.as_int());
6107
6108 if (_declares_nonstatic_concrete_methods) {
6109 _has_nonstatic_concrete_methods = true;
6110 }
6111
6112 // Additional attributes/annotations
6113 _parsed_annotations = new ClassAnnotationCollector();
6114 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6115
6116 assert(_inner_classes != NULL, "invariant");
6117
6118 // Finalize the Annotations metadata object,
6119 // now that all annotation arrays have been created.
6120 create_combined_annotations(CHECK);
6121
6122 // Make sure this is the end of class file stream
6123 guarantee_property(stream->at_eos(),
6124 "Extra bytes at the end of class file %s",
6125 CHECK);
6126
6127 // all bytes in stream read and parsed
6128 }
6129
6130 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6131 ConstantPool* cp,
6132 TRAPS) {
6133 assert(stream != NULL, "invariant");
6134 assert(stream->at_eos(), "invariant");
6135 assert(cp != NULL, "invariant");
6136 assert(_loader_data != NULL, "invariant");
6137
6138 if (_class_name == vmSymbols::java_lang_Object()) {
6139 check_property(_local_interfaces == Universe::the_empty_klass_array(),
6140 "java.lang.Object cannot implement an interface in class file %s",
6141 CHECK);
6142 }
6143 // We check super class after class file is parsed and format is checked
6144 if (_super_class_index > 0 && NULL ==_super_klass) {
6145 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6146 if (_access_flags.is_interface()) {
6147 // Before attempting to resolve the superclass, check for class format
6148 // errors not checked yet.
6149 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6150 "Interfaces must have java.lang.Object as superclass in class file %s",
6151 CHECK);
6152 }
6153 Handle loader(THREAD, _loader_data->class_loader());
6154 _super_klass = (const InstanceKlass*)
6155 SystemDictionary::resolve_super_or_fail(_class_name,
6156 super_class_name,
6157 loader,
6158 _protection_domain,
6159 true,
6160 CHECK);
6161 }
6162
6163 if (_super_klass != NULL) {
6164 if (_super_klass->has_nonstatic_concrete_methods()) {
6165 _has_nonstatic_concrete_methods = true;
6166 }
6167
6168 if (_super_klass->is_interface()) {
6169 ResourceMark rm(THREAD);
6170 Exceptions::fthrow(
6171 THREAD_AND_LOCATION,
6172 vmSymbols::java_lang_IncompatibleClassChangeError(),
6173 "class %s has interface %s as super class",
6174 _class_name->as_klass_external_name(),
6175 _super_klass->external_name()
6176 );
6177 return;
6178 }
6179 // Make sure super class is not final
6180 if (_super_klass->is_final()) {
6181 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6182 }
6183 }
6184
6185 // Compute the transitive list of all unique interfaces implemented by this class
6186 _transitive_interfaces =
6187 compute_transitive_interfaces(_super_klass,
6188 _local_interfaces,
6189 _loader_data,
6190 CHECK);
6191
6192 assert(_transitive_interfaces != NULL, "invariant");
6193
6194 // sort methods
6195 _method_ordering = sort_methods(_methods);
6196
6197 _all_mirandas = new GrowableArray<Method*>(20);
6198
6199 Handle loader(THREAD, _loader_data->class_loader());
6200 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6201 &_num_miranda_methods,
6202 _all_mirandas,
6203 _super_klass,
6204 _methods,
6205 _access_flags,
6206 _major_version,
6207 loader,
6208 _class_name,
6209 _local_interfaces,
6210 CHECK);
6211
6212 // Size of Java itable (in words)
6213 _itable_size = _access_flags.is_interface() ? 0 :
6214 klassItable::compute_itable_size(_transitive_interfaces);
6215
6216 assert(_fac != NULL, "invariant");
6217 assert(_parsed_annotations != NULL, "invariant");
6218
6219 _field_info = new FieldLayoutInfo();
6220 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6221
6222 // Compute reference typ
6223 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6224
6225 }
6226
6227 void ClassFileParser::set_klass(InstanceKlass* klass) {
6228
6229 #ifdef ASSERT
6230 if (klass != NULL) {
6231 assert(NULL == _klass, "leaking?");
6232 }
6233 #endif
6234
6235 _klass = klass;
6236 }
6237
6238 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6239
6240 #ifdef ASSERT
6241 if (klass != NULL) {
6242 assert(NULL == _klass_to_deallocate, "leaking?");
6243 }
6244 #endif
6245
6246 _klass_to_deallocate = klass;
6247 }
6248
6249 // Caller responsible for ResourceMark
6250 // clone stream with rewound position
6251 const ClassFileStream* ClassFileParser::clone_stream() const {
6252 assert(_stream != NULL, "invariant");
6253
6254 return _stream->clone();
6255 }
6256 // ----------------------------------------------------------------------------
6257 // debugging
6258
6259 #ifdef ASSERT
6260
6261 // return true if class_name contains no '.' (internal format is '/')
6262 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6263 if (class_name != NULL) {
6264 ResourceMark rm;
6265 char* name = class_name->as_C_string();
6266 return strchr(name, '.') == NULL;
6267 } else {
6268 return true;
6269 }
6270 }
6271
6272 #endif