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