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 "aot/aotLoader.hpp"
26 #include "classfile/classFileParser.hpp"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/defaultMethods.hpp"
31 #include "classfile/dictionary.hpp"
32 #include "classfile/javaClasses.inline.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/symbolTable.hpp"
35 #include "classfile/systemDictionary.hpp"
36 #include "classfile/verificationType.hpp"
37 #include "classfile/verifier.hpp"
38 #include "classfile/vmSymbols.hpp"
39 #include "gc/shared/gcLocker.hpp"
40 #include "logging/log.hpp"
41 #include "memory/allocation.hpp"
42 #include "memory/metadataFactory.hpp"
43 #include "memory/oopFactory.hpp"
44 #include "memory/resourceArea.hpp"
45 #include "memory/universe.inline.hpp"
46 #include "oops/annotations.hpp"
47 #include "oops/fieldStreams.hpp"
48 #include "oops/instanceKlass.hpp"
49 #include "oops/instanceMirrorKlass.hpp"
50 #include "oops/klass.inline.hpp"
51 #include "oops/klassVtable.hpp"
52 #include "oops/metadata.hpp"
53 #include "oops/method.hpp"
54 #include "oops/oop.inline.hpp"
55 #include "oops/symbol.hpp"
56 #include "prims/jvm.h"
57 #include "prims/jvmtiExport.hpp"
58 #include "prims/jvmtiThreadState.hpp"
59 #include "runtime/javaCalls.hpp"
60 #include "runtime/perfData.hpp"
61 #include "runtime/reflection.hpp"
62 #include "runtime/signature.hpp"
63 #include "runtime/timer.hpp"
64 #include "services/classLoadingService.hpp"
65 #include "services/threadService.hpp"
66 #include "trace/traceMacros.hpp"
67 #include "utilities/bitMap.inline.hpp"
68 #include "utilities/exceptions.hpp"
69 #include "utilities/globalDefinitions.hpp"
70 #include "utilities/growableArray.hpp"
71 #include "utilities/macros.hpp"
72 #include "utilities/ostream.hpp"
73 #include "utilities/resourceHash.hpp"
74 #if INCLUDE_CDS
75 #include "classfile/systemDictionaryShared.hpp"
76 #endif
77
78 // We generally try to create the oops directly when parsing, rather than
79 // allocating temporary data structures and copying the bytes twice. A
80 // temporary area is only needed when parsing utf8 entries in the constant
81 // pool and when parsing line number tables.
82
83 // We add assert in debug mode when class format is not checked.
84
85 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
86 #define JAVA_MIN_SUPPORTED_VERSION 45
87 #define JAVA_MAX_SUPPORTED_VERSION 53
88 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
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 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
110 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION,
111 "Unexpected bad constant pool entry");
112 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
113 }
114
115 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
116 ConstantPool* cp,
117 const int length,
118 TRAPS) {
119 assert(stream != NULL, "invariant");
120 assert(cp != NULL, "invariant");
121
122 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
123 // this function (_current can be allocated in a register, with scalar
124 // replacement of aggregates). The _current pointer is copied back to
125 // stream() when this function returns. DON'T call another method within
126 // this method that uses stream().
127 const ClassFileStream cfs1 = *stream;
128 const ClassFileStream* const cfs = &cfs1;
129
130 assert(cfs->allocated_on_stack(), "should be local");
131 debug_only(const u1* const old_current = stream->current();)
132
133 // Used for batching symbol allocations.
134 const char* names[SymbolTable::symbol_alloc_batch_size];
135 int lengths[SymbolTable::symbol_alloc_batch_size];
136 int indices[SymbolTable::symbol_alloc_batch_size];
137 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
138 int names_count = 0;
139
140 // parsing Index 0 is unused
141 for (int index = 1; index < length; index++) {
142 // Each of the following case guarantees one more byte in the stream
143 // for the following tag or the access_flags following constant pool,
144 // so we don't need bounds-check for reading tag.
145 const u1 tag = cfs->get_u1_fast();
146 switch (tag) {
147 case JVM_CONSTANT_Class : {
148 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
149 const u2 name_index = cfs->get_u2_fast();
150 cp->klass_index_at_put(index, name_index);
151 break;
152 }
153 case JVM_CONSTANT_Fieldref: {
154 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
155 const u2 class_index = cfs->get_u2_fast();
156 const u2 name_and_type_index = cfs->get_u2_fast();
157 cp->field_at_put(index, class_index, name_and_type_index);
158 break;
159 }
160 case JVM_CONSTANT_Methodref: {
161 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
162 const u2 class_index = cfs->get_u2_fast();
163 const u2 name_and_type_index = cfs->get_u2_fast();
164 cp->method_at_put(index, class_index, name_and_type_index);
165 break;
166 }
167 case JVM_CONSTANT_InterfaceMethodref: {
168 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
169 const u2 class_index = cfs->get_u2_fast();
170 const u2 name_and_type_index = cfs->get_u2_fast();
171 cp->interface_method_at_put(index, class_index, name_and_type_index);
172 break;
173 }
174 case JVM_CONSTANT_String : {
175 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
176 const u2 string_index = cfs->get_u2_fast();
177 cp->string_index_at_put(index, string_index);
178 break;
179 }
180 case JVM_CONSTANT_MethodHandle :
181 case JVM_CONSTANT_MethodType: {
182 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
183 classfile_parse_error(
184 "Class file version does not support constant tag %u in class file %s",
185 tag, CHECK);
186 }
187 if (tag == JVM_CONSTANT_MethodHandle) {
188 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
189 const u1 ref_kind = cfs->get_u1_fast();
190 const u2 method_index = cfs->get_u2_fast();
191 cp->method_handle_index_at_put(index, ref_kind, method_index);
192 }
193 else if (tag == JVM_CONSTANT_MethodType) {
194 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
195 const u2 signature_index = cfs->get_u2_fast();
196 cp->method_type_index_at_put(index, signature_index);
197 }
198 else {
199 ShouldNotReachHere();
200 }
201 break;
202 }
203 case JVM_CONSTANT_InvokeDynamic : {
204 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
205 classfile_parse_error(
206 "Class file version does not support constant tag %u in class file %s",
207 tag, CHECK);
208 }
209 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
210 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
211 const u2 name_and_type_index = cfs->get_u2_fast();
212 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
213 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
214 }
215 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
216 break;
217 }
218 case JVM_CONSTANT_Integer: {
219 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
220 const u4 bytes = cfs->get_u4_fast();
221 cp->int_at_put(index, (jint)bytes);
222 break;
223 }
224 case JVM_CONSTANT_Float: {
225 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
226 const u4 bytes = cfs->get_u4_fast();
227 cp->float_at_put(index, *(jfloat*)&bytes);
228 break;
229 }
230 case JVM_CONSTANT_Long: {
231 // A mangled type might cause you to overrun allocated memory
232 guarantee_property(index + 1 < length,
233 "Invalid constant pool entry %u in class file %s",
234 index,
235 CHECK);
236 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
237 const u8 bytes = cfs->get_u8_fast();
238 cp->long_at_put(index, bytes);
239 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
240 break;
241 }
242 case JVM_CONSTANT_Double: {
243 // A mangled type might cause you to overrun allocated memory
244 guarantee_property(index+1 < length,
245 "Invalid constant pool entry %u in class file %s",
246 index,
247 CHECK);
248 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
249 const u8 bytes = cfs->get_u8_fast();
250 cp->double_at_put(index, *(jdouble*)&bytes);
251 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
252 break;
253 }
254 case JVM_CONSTANT_NameAndType: {
255 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
256 const u2 name_index = cfs->get_u2_fast();
257 const u2 signature_index = cfs->get_u2_fast();
258 cp->name_and_type_at_put(index, name_index, signature_index);
259 break;
260 }
261 case JVM_CONSTANT_Utf8 : {
262 cfs->guarantee_more(2, CHECK); // utf8_length
263 u2 utf8_length = cfs->get_u2_fast();
264 const u1* utf8_buffer = cfs->get_u1_buffer();
265 assert(utf8_buffer != NULL, "null utf8 buffer");
266 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
267 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
268 cfs->skip_u1_fast(utf8_length);
269
270 // Before storing the symbol, make sure it's legal
271 if (_need_verify) {
272 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
273 }
274
275 if (has_cp_patch_at(index)) {
276 Handle patch = clear_cp_patch_at(index);
277 guarantee_property(java_lang_String::is_instance(patch()),
278 "Illegal utf8 patch at %d in class file %s",
279 index,
280 CHECK);
281 const char* const str = java_lang_String::as_utf8_string(patch());
282 // (could use java_lang_String::as_symbol instead, but might as well batch them)
283 utf8_buffer = (const u1*) str;
284 utf8_length = (int) strlen(str);
285 }
286
287 unsigned int hash;
288 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
289 utf8_length,
290 hash);
291 if (result == NULL) {
292 names[names_count] = (const char*)utf8_buffer;
293 lengths[names_count] = utf8_length;
294 indices[names_count] = index;
295 hashValues[names_count++] = hash;
296 if (names_count == SymbolTable::symbol_alloc_batch_size) {
297 SymbolTable::new_symbols(_loader_data,
298 cp,
299 names_count,
300 names,
301 lengths,
302 indices,
303 hashValues,
304 CHECK);
305 names_count = 0;
306 }
307 } else {
308 cp->symbol_at_put(index, result);
309 }
310 break;
311 }
312 case 19:
313 case 20: {
314 // Record that an error occurred in these two cases but keep parsing so
315 // that ACC_Module can be checked for in the access_flags. Need to
316 // throw NoClassDefFoundError in that case.
317 if (_major_version >= JAVA_9_VERSION) {
318 cfs->guarantee_more(3, CHECK);
319 cfs->get_u2_fast();
320 set_class_bad_constant_seen(tag);
321 break;
322 }
323 }
324 default: {
325 classfile_parse_error("Unknown constant tag %u in class file %s",
326 tag,
327 CHECK);
328 break;
329 }
330 } // end of switch(tag)
331 } // end of for
332
333 // Allocate the remaining symbols
334 if (names_count > 0) {
335 SymbolTable::new_symbols(_loader_data,
336 cp,
337 names_count,
338 names,
339 lengths,
340 indices,
341 hashValues,
342 CHECK);
343 }
344
345 // Copy _current pointer of local copy back to stream.
346 assert(stream->current() == old_current, "non-exclusive use of stream");
347 stream->set_current(cfs1.current());
348
349 }
350
351 static inline bool valid_cp_range(int index, int length) {
352 return (index > 0 && index < length);
353 }
354
355 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
356 assert(cp != NULL, "invariant");
357 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
358 return cp->symbol_at(index);
359 }
360 return NULL;
361 }
362
363 #ifdef ASSERT
364 PRAGMA_DIAG_PUSH
365 PRAGMA_FORMAT_NONLITERAL_IGNORED
366 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
367 ResourceMark rm(THREAD);
368 fatal(msg, _class_name->as_C_string());
369 }
370
371 void ClassFileParser::report_assert_property_failure(const char* msg,
372 int index,
373 TRAPS) const {
374 ResourceMark rm(THREAD);
375 fatal(msg, index, _class_name->as_C_string());
376 }
377 PRAGMA_DIAG_POP
378 #endif
379
380 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
381 ConstantPool* const cp,
382 const int length,
383 TRAPS) {
384 assert(cp != NULL, "invariant");
385 assert(stream != NULL, "invariant");
386
387 // parsing constant pool entries
388 parse_constant_pool_entries(stream, cp, length, CHECK);
389 if (class_bad_constant_seen() != 0) {
390 // a bad CP entry has been detected previously so stop parsing and just return.
391 return;
392 }
393
394 int index = 1; // declared outside of loops for portability
395 int num_klasses = 0;
396
397 // first verification pass - validate cross references
398 // and fixup class and string constants
399 for (index = 1; index < length; index++) { // Index 0 is unused
400 const jbyte tag = cp->tag_at(index).value();
401 switch (tag) {
402 case JVM_CONSTANT_Class: {
403 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
404 break;
405 }
406 case JVM_CONSTANT_Fieldref:
407 // fall through
408 case JVM_CONSTANT_Methodref:
409 // fall through
410 case JVM_CONSTANT_InterfaceMethodref: {
411 if (!_need_verify) break;
412 const int klass_ref_index = cp->klass_ref_index_at(index);
413 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
414 check_property(valid_klass_reference_at(klass_ref_index),
415 "Invalid constant pool index %u in class file %s",
416 klass_ref_index, CHECK);
417 check_property(valid_cp_range(name_and_type_ref_index, length) &&
418 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
419 "Invalid constant pool index %u in class file %s",
420 name_and_type_ref_index, CHECK);
421 break;
422 }
423 case JVM_CONSTANT_String: {
424 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
425 break;
426 }
427 case JVM_CONSTANT_Integer:
428 break;
429 case JVM_CONSTANT_Float:
430 break;
431 case JVM_CONSTANT_Long:
432 case JVM_CONSTANT_Double: {
433 index++;
434 check_property(
435 (index < length && cp->tag_at(index).is_invalid()),
436 "Improper constant pool long/double index %u in class file %s",
437 index, CHECK);
438 break;
439 }
440 case JVM_CONSTANT_NameAndType: {
441 if (!_need_verify) break;
442 const int name_ref_index = cp->name_ref_index_at(index);
443 const int signature_ref_index = cp->signature_ref_index_at(index);
444 check_property(valid_symbol_at(name_ref_index),
445 "Invalid constant pool index %u in class file %s",
446 name_ref_index, CHECK);
447 check_property(valid_symbol_at(signature_ref_index),
448 "Invalid constant pool index %u in class file %s",
449 signature_ref_index, CHECK);
450 break;
451 }
452 case JVM_CONSTANT_Utf8:
453 break;
454 case JVM_CONSTANT_UnresolvedClass: // fall-through
455 case JVM_CONSTANT_UnresolvedClassInError: {
456 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
457 break;
458 }
459 case JVM_CONSTANT_ClassIndex: {
460 const int class_index = cp->klass_index_at(index);
461 check_property(valid_symbol_at(class_index),
462 "Invalid constant pool index %u in class file %s",
463 class_index, CHECK);
464 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
465 break;
466 }
467 case JVM_CONSTANT_StringIndex: {
468 const int string_index = cp->string_index_at(index);
469 check_property(valid_symbol_at(string_index),
470 "Invalid constant pool index %u in class file %s",
471 string_index, CHECK);
472 Symbol* const sym = cp->symbol_at(string_index);
473 cp->unresolved_string_at_put(index, sym);
474 break;
475 }
476 case JVM_CONSTANT_MethodHandle: {
477 const int ref_index = cp->method_handle_index_at(index);
478 check_property(valid_cp_range(ref_index, length),
479 "Invalid constant pool index %u in class file %s",
480 ref_index, CHECK);
481 const constantTag tag = cp->tag_at(ref_index);
482 const int ref_kind = cp->method_handle_ref_kind_at(index);
483
484 switch (ref_kind) {
485 case JVM_REF_getField:
486 case JVM_REF_getStatic:
487 case JVM_REF_putField:
488 case JVM_REF_putStatic: {
489 check_property(
490 tag.is_field(),
491 "Invalid constant pool index %u in class file %s (not a field)",
492 ref_index, CHECK);
493 break;
494 }
495 case JVM_REF_invokeVirtual:
496 case JVM_REF_newInvokeSpecial: {
497 check_property(
498 tag.is_method(),
499 "Invalid constant pool index %u in class file %s (not a method)",
500 ref_index, CHECK);
501 break;
502 }
503 case JVM_REF_invokeStatic:
504 case JVM_REF_invokeSpecial: {
505 check_property(
506 tag.is_method() ||
507 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
508 "Invalid constant pool index %u in class file %s (not a method)",
509 ref_index, CHECK);
510 break;
511 }
512 case JVM_REF_invokeInterface: {
513 check_property(
514 tag.is_interface_method(),
515 "Invalid constant pool index %u in class file %s (not an interface method)",
516 ref_index, CHECK);
517 break;
518 }
519 default: {
520 classfile_parse_error(
521 "Bad method handle kind at constant pool index %u in class file %s",
522 index, CHECK);
523 }
524 } // switch(refkind)
525 // Keep the ref_index unchanged. It will be indirected at link-time.
526 break;
527 } // case MethodHandle
528 case JVM_CONSTANT_MethodType: {
529 const int ref_index = cp->method_type_index_at(index);
530 check_property(valid_symbol_at(ref_index),
531 "Invalid constant pool index %u in class file %s",
532 ref_index, CHECK);
533 break;
534 }
535 case JVM_CONSTANT_InvokeDynamic: {
536 const int name_and_type_ref_index =
537 cp->invoke_dynamic_name_and_type_ref_index_at(index);
538
539 check_property(valid_cp_range(name_and_type_ref_index, length) &&
540 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
541 "Invalid constant pool index %u in class file %s",
542 name_and_type_ref_index, CHECK);
543 // bootstrap specifier index must be checked later,
544 // when BootstrapMethods attr is available
545 break;
546 }
547 default: {
548 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
549 ShouldNotReachHere();
550 break;
551 }
552 } // switch(tag)
553 } // end of for
554
555 _first_patched_klass_resolved_index = num_klasses;
556 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
557
558 if (_cp_patches != NULL) {
559 // need to treat this_class specially...
560
561 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
562 // for now. These will be replaced with actual names of the patched classes in patch_class().
563 Symbol* s = vmSymbols::star_name();
564 for (int n=_orig_cp_size; n<cp->length(); n++) {
565 cp->symbol_at_put(n, s);
566 }
567
568 int this_class_index;
569 {
570 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
571 const u1* const mark = stream->current();
572 stream->skip_u2_fast(1); // skip flags
573 this_class_index = stream->get_u2_fast();
574 stream->set_current(mark); // revert to mark
575 }
576
577 for (index = 1; index < length; index++) { // Index 0 is unused
578 if (has_cp_patch_at(index)) {
579 guarantee_property(index != this_class_index,
580 "Illegal constant pool patch to self at %d in class file %s",
581 index, CHECK);
582 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
583 }
584 }
585 }
586
587 if (!_need_verify) {
588 return;
589 }
590
591 // second verification pass - checks the strings are of the right format.
592 // but not yet to the other entries
593 for (index = 1; index < length; index++) {
594 const jbyte tag = cp->tag_at(index).value();
595 switch (tag) {
596 case JVM_CONSTANT_UnresolvedClass: {
597 const Symbol* const class_name = cp->klass_name_at(index);
598 // check the name, even if _cp_patches will overwrite it
599 verify_legal_class_name(class_name, CHECK);
600 break;
601 }
602 case JVM_CONSTANT_NameAndType: {
603 if (_need_verify) {
604 const int sig_index = cp->signature_ref_index_at(index);
605 const int name_index = cp->name_ref_index_at(index);
606 const Symbol* const name = cp->symbol_at(name_index);
607 const Symbol* const sig = cp->symbol_at(sig_index);
608 guarantee_property(sig->utf8_length() != 0,
609 "Illegal zero length constant pool entry at %d in class %s",
610 sig_index, CHECK);
611 guarantee_property(name->utf8_length() != 0,
612 "Illegal zero length constant pool entry at %d in class %s",
613 name_index, CHECK);
614
615 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
616 // Format check method name and signature
617 verify_legal_method_name(name, CHECK);
618 verify_legal_method_signature(name, sig, CHECK);
619 } else {
620 // Format check field name and signature
621 verify_legal_field_name(name, CHECK);
622 verify_legal_field_signature(name, sig, CHECK);
623 }
624 }
625 break;
626 }
627 case JVM_CONSTANT_InvokeDynamic:
628 case JVM_CONSTANT_Fieldref:
629 case JVM_CONSTANT_Methodref:
630 case JVM_CONSTANT_InterfaceMethodref: {
631 const int name_and_type_ref_index =
632 cp->name_and_type_ref_index_at(index);
633 // already verified to be utf8
634 const int name_ref_index =
635 cp->name_ref_index_at(name_and_type_ref_index);
636 // already verified to be utf8
637 const int signature_ref_index =
638 cp->signature_ref_index_at(name_and_type_ref_index);
639 const Symbol* const name = cp->symbol_at(name_ref_index);
640 const Symbol* const signature = cp->symbol_at(signature_ref_index);
641 if (tag == JVM_CONSTANT_Fieldref) {
642 if (_need_verify) {
643 // Field name and signature are verified above, when iterating NameAndType_info.
644 // Need only to be sure signature is non-zero length and the right type.
645 if (signature->utf8_length() == 0 ||
646 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
647 throwIllegalSignature("Field", name, signature, CHECK);
648 }
649 }
650 } else {
651 if (_need_verify) {
652 // Method name and signature are verified above, when iterating NameAndType_info.
653 // Need only to be sure signature is non-zero length and the right type.
654 if (signature->utf8_length() == 0 ||
655 signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
656 throwIllegalSignature("Method", name, signature, CHECK);
657 }
658 }
659 // 4509014: If a class method name begins with '<', it must be "<init>"
660 const unsigned int name_len = name->utf8_length();
661 if (tag == JVM_CONSTANT_Methodref &&
662 name_len != 0 &&
663 name->byte_at(0) == '<' &&
664 name != vmSymbols::object_initializer_name()) {
665 classfile_parse_error(
666 "Bad method name at constant pool index %u in class file %s",
667 name_ref_index, CHECK);
668 }
669 }
670 break;
671 }
672 case JVM_CONSTANT_MethodHandle: {
673 const int ref_index = cp->method_handle_index_at(index);
674 const int ref_kind = cp->method_handle_ref_kind_at(index);
675 switch (ref_kind) {
676 case JVM_REF_invokeVirtual:
677 case JVM_REF_invokeStatic:
678 case JVM_REF_invokeSpecial:
679 case JVM_REF_newInvokeSpecial: {
680 const int name_and_type_ref_index =
681 cp->name_and_type_ref_index_at(ref_index);
682 const int name_ref_index =
683 cp->name_ref_index_at(name_and_type_ref_index);
684 const Symbol* const name = cp->symbol_at(name_ref_index);
685 if (ref_kind == JVM_REF_newInvokeSpecial) {
686 if (name != vmSymbols::object_initializer_name()) {
687 classfile_parse_error(
688 "Bad constructor name at constant pool index %u in class file %s",
689 name_ref_index, CHECK);
690 }
691 } else {
692 if (name == vmSymbols::object_initializer_name()) {
693 classfile_parse_error(
694 "Bad method name at constant pool index %u in class file %s",
695 name_ref_index, CHECK);
696 }
697 }
698 break;
699 }
700 // Other ref_kinds are already fully checked in previous pass.
701 } // switch(ref_kind)
702 break;
703 }
704 case JVM_CONSTANT_MethodType: {
705 const Symbol* const no_name = vmSymbols::type_name(); // place holder
706 const Symbol* const signature = cp->method_type_signature_at(index);
707 verify_legal_method_signature(no_name, signature, CHECK);
708 break;
709 }
710 case JVM_CONSTANT_Utf8: {
711 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
712 }
713 } // switch(tag)
714 } // end of for
715 }
716
717 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
718 int name_index = _orig_cp_size + _num_patched_klasses;
719 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
720
721 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
722 _num_patched_klasses ++;
723 }
724
725 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
726 int index,
727 Handle patch,
728 TRAPS) {
729 assert(cp != NULL, "invariant");
730
731 BasicType patch_type = T_VOID;
732
733 switch (cp->tag_at(index).value()) {
734
735 case JVM_CONSTANT_UnresolvedClass: {
736 // Patching a class means pre-resolving it.
737 // The name in the constant pool is ignored.
738 if (java_lang_Class::is_instance(patch())) {
739 guarantee_property(!java_lang_Class::is_primitive(patch()),
740 "Illegal class patch at %d in class file %s",
741 index, CHECK);
742 Klass* k = java_lang_Class::as_Klass(patch());
743 patch_class(cp, index, k, k->name());
744 } else {
745 guarantee_property(java_lang_String::is_instance(patch()),
746 "Illegal class patch at %d in class file %s",
747 index, CHECK);
748 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK);
749 patch_class(cp, index, NULL, name);
750 }
751 break;
752 }
753
754 case JVM_CONSTANT_String: {
755 // skip this patch and don't clear it. Needs the oop array for resolved
756 // references to be created first.
757 return;
758 }
759 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
760 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
761 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
762 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
763 patch_prim:
764 {
765 jvalue value;
766 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
767 guarantee_property(value_type == patch_type,
768 "Illegal primitive patch at %d in class file %s",
769 index, CHECK);
770 switch (value_type) {
771 case T_INT: cp->int_at_put(index, value.i); break;
772 case T_FLOAT: cp->float_at_put(index, value.f); break;
773 case T_LONG: cp->long_at_put(index, value.j); break;
774 case T_DOUBLE: cp->double_at_put(index, value.d); break;
775 default: assert(false, "");
776 }
777 } // end patch_prim label
778 break;
779
780 default: {
781 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
782 guarantee_property(!has_cp_patch_at(index),
783 "Illegal unexpected patch at %d in class file %s",
784 index, CHECK);
785 return;
786 }
787 } // end of switch(tag)
788
789 // On fall-through, mark the patch as used.
790 clear_cp_patch_at(index);
791 }
792 class NameSigHash: public ResourceObj {
793 public:
794 const Symbol* _name; // name
795 const Symbol* _sig; // signature
796 NameSigHash* _next; // Next entry in hash table
797 };
798
799 static const int HASH_ROW_SIZE = 256;
800
801 static unsigned int hash(const Symbol* name, const Symbol* sig) {
802 unsigned int raw_hash = 0;
803 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
804 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
805
806 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
807 }
808
809
810 static void initialize_hashtable(NameSigHash** table) {
811 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
812 }
813 // Return false if the name/sig combination is found in table.
814 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
815 // The old format checker uses heap sort to find duplicates.
816 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
817 // of table since we don't expect Symbol*'s to move.
818 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
819 assert(name != NULL, "name in constant pool is NULL");
820
821 // First lookup for duplicates
822 int index = hash(name, sig);
823 NameSigHash* entry = table[index];
824 while (entry != NULL) {
825 if (entry->_name == name && entry->_sig == sig) {
826 return false;
827 }
828 entry = entry->_next;
829 }
830
831 // No duplicate is found, allocate a new entry and fill it.
832 entry = new NameSigHash();
833 entry->_name = name;
834 entry->_sig = sig;
835
836 // Insert into hash table
837 entry->_next = table[index];
838 table[index] = entry;
839
840 return true;
841 }
842
843 // Side-effects: populates the _local_interfaces field
844 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
845 const int itfs_len,
846 ConstantPool* const cp,
847 bool* const has_nonstatic_concrete_methods,
848 TRAPS) {
849 assert(stream != NULL, "invariant");
850 assert(cp != NULL, "invariant");
851 assert(has_nonstatic_concrete_methods != NULL, "invariant");
852
853 if (itfs_len == 0) {
854 _local_interfaces = Universe::the_empty_klass_array();
855 } else {
856 assert(itfs_len > 0, "only called for len>0");
857 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, itfs_len, NULL, CHECK);
858
859 int index;
860 for (index = 0; index < itfs_len; index++) {
861 const u2 interface_index = stream->get_u2(CHECK);
862 Klass* interf;
863 check_property(
864 valid_klass_reference_at(interface_index),
865 "Interface name has bad constant pool index %u in class file %s",
866 interface_index, CHECK);
867 if (cp->tag_at(interface_index).is_klass()) {
868 interf = cp->resolved_klass_at(interface_index);
869 } else {
870 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
871
872 // Don't need to check legal name because it's checked when parsing constant pool.
873 // But need to make sure it's not an array type.
874 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
875 "Bad interface name in class file %s", CHECK);
876
877 // Call resolve_super so classcircularity is checked
878 interf = SystemDictionary::resolve_super_or_fail(
879 _class_name,
880 unresolved_klass,
881 Handle(THREAD, _loader_data->class_loader()),
882 _protection_domain,
883 false,
884 CHECK);
885 }
886
887 if (!interf->is_interface()) {
888 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
889 "Implementing class");
890 }
891
892 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
893 *has_nonstatic_concrete_methods = true;
894 }
895 _local_interfaces->at_put(index, interf);
896 }
897
898 if (!_need_verify || itfs_len <= 1) {
899 return;
900 }
901
902 // Check if there's any duplicates in interfaces
903 ResourceMark rm(THREAD);
904 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
905 NameSigHash*,
906 HASH_ROW_SIZE);
907 initialize_hashtable(interface_names);
908 bool dup = false;
909 const Symbol* name = NULL;
910 {
911 debug_only(NoSafepointVerifier nsv;)
912 for (index = 0; index < itfs_len; index++) {
913 const Klass* const k = _local_interfaces->at(index);
914 name = InstanceKlass::cast(k)->name();
915 // If no duplicates, add (name, NULL) in hashtable interface_names.
916 if (!put_after_lookup(name, NULL, interface_names)) {
917 dup = true;
918 break;
919 }
920 }
921 }
922 if (dup) {
923 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
924 name->as_C_string(), CHECK);
925 }
926 }
927 }
928
929 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
930 int constantvalue_index,
931 int signature_index,
932 TRAPS) const {
933 // Make sure the constant pool entry is of a type appropriate to this field
934 guarantee_property(
935 (constantvalue_index > 0 &&
936 constantvalue_index < cp->length()),
937 "Bad initial value index %u in ConstantValue attribute in class file %s",
938 constantvalue_index, CHECK);
939
940 const constantTag value_type = cp->tag_at(constantvalue_index);
941 switch(cp->basic_type_for_signature_at(signature_index)) {
942 case T_LONG: {
943 guarantee_property(value_type.is_long(),
944 "Inconsistent constant value type in class file %s",
945 CHECK);
946 break;
947 }
948 case T_FLOAT: {
949 guarantee_property(value_type.is_float(),
950 "Inconsistent constant value type in class file %s",
951 CHECK);
952 break;
953 }
954 case T_DOUBLE: {
955 guarantee_property(value_type.is_double(),
956 "Inconsistent constant value type in class file %s",
957 CHECK);
958 break;
959 }
960 case T_BYTE:
961 case T_CHAR:
962 case T_SHORT:
963 case T_BOOLEAN:
964 case T_INT: {
965 guarantee_property(value_type.is_int(),
966 "Inconsistent constant value type in class file %s",
967 CHECK);
968 break;
969 }
970 case T_OBJECT: {
971 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
972 && value_type.is_string()),
973 "Bad string initial value in class file %s",
974 CHECK);
975 break;
976 }
977 default: {
978 classfile_parse_error("Unable to set initial value %u in class file %s",
979 constantvalue_index,
980 CHECK);
981 }
982 }
983 }
984
985 class AnnotationCollector : public ResourceObj{
986 public:
987 enum Location { _in_field, _in_method, _in_class };
988 enum ID {
989 _unknown = 0,
990 _method_CallerSensitive,
991 _method_ForceInline,
992 _method_DontInline,
993 _method_InjectedProfile,
994 _method_LambdaForm_Compiled,
995 _method_LambdaForm_Hidden,
996 _method_HotSpotIntrinsicCandidate,
997 _jdk_internal_vm_annotation_Contended,
998 _field_Stable,
999 _jdk_internal_vm_annotation_ReservedStackAccess,
1000 _annotation_LIMIT
1001 };
1002 const Location _location;
1003 int _annotations_present;
1004 u2 _contended_group;
1005
1006 AnnotationCollector(Location location)
1007 : _location(location), _annotations_present(0)
1008 {
1009 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1010 }
1011 // If this annotation name has an ID, report it (or _none).
1012 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1013 // Set the annotation name:
1014 void set_annotation(ID id) {
1015 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1016 _annotations_present |= nth_bit((int)id);
1017 }
1018
1019 void remove_annotation(ID id) {
1020 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1021 _annotations_present &= ~nth_bit((int)id);
1022 }
1023
1024 // Report if the annotation is present.
1025 bool has_any_annotations() const { return _annotations_present != 0; }
1026 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1027
1028 void set_contended_group(u2 group) { _contended_group = group; }
1029 u2 contended_group() const { return _contended_group; }
1030
1031 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1032
1033 void set_stable(bool stable) { set_annotation(_field_Stable); }
1034 bool is_stable() const { return has_annotation(_field_Stable); }
1035 };
1036
1037 // This class also doubles as a holder for metadata cleanup.
1038 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1039 private:
1040 ClassLoaderData* _loader_data;
1041 AnnotationArray* _field_annotations;
1042 AnnotationArray* _field_type_annotations;
1043 public:
1044 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1045 AnnotationCollector(_in_field),
1046 _loader_data(loader_data),
1047 _field_annotations(NULL),
1048 _field_type_annotations(NULL) {}
1049 ~FieldAnnotationCollector();
1050 void apply_to(FieldInfo* f);
1051 AnnotationArray* field_annotations() { return _field_annotations; }
1052 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1053
1054 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1055 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1056 };
1057
1058 class MethodAnnotationCollector : public AnnotationCollector{
1059 public:
1060 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1061 void apply_to(methodHandle m);
1062 };
1063
1064 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1065 public:
1066 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1067 void apply_to(InstanceKlass* ik);
1068 };
1069
1070
1071 static int skip_annotation_value(const u1*, int, int); // fwd decl
1072
1073 // Safely increment index by val if does not pass limit
1074 #define SAFE_ADD(index, limit, val) \
1075 if (index >= limit - val) return limit; \
1076 index += val;
1077
1078 // Skip an annotation. Return >=limit if there is any problem.
1079 static int skip_annotation(const u1* buffer, int limit, int index) {
1080 assert(buffer != NULL, "invariant");
1081 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1082 // value := switch (tag:u1) { ... }
1083 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1084 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1085 while (--nmem >= 0 && index < limit) {
1086 SAFE_ADD(index, limit, 2); // skip member
1087 index = skip_annotation_value(buffer, limit, index);
1088 }
1089 return index;
1090 }
1091
1092 // Skip an annotation value. Return >=limit if there is any problem.
1093 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1094 assert(buffer != NULL, "invariant");
1095
1096 // value := switch (tag:u1) {
1097 // case B, C, I, S, Z, D, F, J, c: con:u2;
1098 // case e: e_class:u2 e_name:u2;
1099 // case s: s_con:u2;
1100 // case [: do(nval:u2) {value};
1101 // case @: annotation;
1102 // case s: s_con:u2;
1103 // }
1104 SAFE_ADD(index, limit, 1); // read tag
1105 const u1 tag = buffer[index - 1];
1106 switch (tag) {
1107 case 'B':
1108 case 'C':
1109 case 'I':
1110 case 'S':
1111 case 'Z':
1112 case 'D':
1113 case 'F':
1114 case 'J':
1115 case 'c':
1116 case 's':
1117 SAFE_ADD(index, limit, 2); // skip con or s_con
1118 break;
1119 case 'e':
1120 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1121 break;
1122 case '[':
1123 {
1124 SAFE_ADD(index, limit, 2); // read nval
1125 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1126 while (--nval >= 0 && index < limit) {
1127 index = skip_annotation_value(buffer, limit, index);
1128 }
1129 }
1130 break;
1131 case '@':
1132 index = skip_annotation(buffer, limit, index);
1133 break;
1134 default:
1135 return limit; // bad tag byte
1136 }
1137 return index;
1138 }
1139
1140 // Sift through annotations, looking for those significant to the VM:
1141 static void parse_annotations(const ConstantPool* const cp,
1142 const u1* buffer, int limit,
1143 AnnotationCollector* coll,
1144 ClassLoaderData* loader_data,
1145 TRAPS) {
1146
1147 assert(cp != NULL, "invariant");
1148 assert(buffer != NULL, "invariant");
1149 assert(coll != NULL, "invariant");
1150 assert(loader_data != NULL, "invariant");
1151
1152 // annotations := do(nann:u2) {annotation}
1153 int index = 2; // read nann
1154 if (index >= limit) return;
1155 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1156 enum { // initial annotation layout
1157 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1158 count_off = 2, // u2 such as 1 (one value)
1159 member_off = 4, // utf8 such as 'value'
1160 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1161 e_tag_val = 'e',
1162 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1163 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1164 e_size = 11, // end of 'e' annotation
1165 c_tag_val = 'c', // payload is type
1166 c_con_off = 7, // utf8 payload, such as 'I'
1167 c_size = 9, // end of 'c' annotation
1168 s_tag_val = 's', // payload is String
1169 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1170 s_size = 9,
1171 min_size = 6 // smallest possible size (zero members)
1172 };
1173 // Cannot add min_size to index in case of overflow MAX_INT
1174 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1175 int index0 = index;
1176 index = skip_annotation(buffer, limit, index);
1177 const u1* const abase = buffer + index0;
1178 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1179 const int count = Bytes::get_Java_u2((address)abase + count_off);
1180 const Symbol* const aname = check_symbol_at(cp, atype);
1181 if (aname == NULL) break; // invalid annotation name
1182 const Symbol* member = NULL;
1183 if (count >= 1) {
1184 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1185 member = check_symbol_at(cp, member_index);
1186 if (member == NULL) break; // invalid member name
1187 }
1188
1189 // Here is where parsing particular annotations will take place.
1190 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1191 if (AnnotationCollector::_unknown == id) continue;
1192 coll->set_annotation(id);
1193
1194 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1195 // @Contended can optionally specify the contention group.
1196 //
1197 // Contended group defines the equivalence class over the fields:
1198 // the fields within the same contended group are not treated distinct.
1199 // The only exception is default group, which does not incur the
1200 // equivalence. Naturally, contention group for classes is meaningless.
1201 //
1202 // While the contention group is specified as String, annotation
1203 // values are already interned, and we might as well use the constant
1204 // pool index as the group tag.
1205 //
1206 u2 group_index = 0; // default contended group
1207 if (count == 1
1208 && s_size == (index - index0) // match size
1209 && s_tag_val == *(abase + tag_off)
1210 && member == vmSymbols::value_name()) {
1211 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1212 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1213 group_index = 0; // default contended group
1214 }
1215 }
1216 coll->set_contended_group(group_index);
1217 }
1218 }
1219 }
1220
1221
1222 // Parse attributes for a field.
1223 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1224 u2 attributes_count,
1225 bool is_static, u2 signature_index,
1226 u2* const constantvalue_index_addr,
1227 bool* const is_synthetic_addr,
1228 u2* const generic_signature_index_addr,
1229 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1230 TRAPS) {
1231 assert(cfs != NULL, "invariant");
1232 assert(constantvalue_index_addr != NULL, "invariant");
1233 assert(is_synthetic_addr != NULL, "invariant");
1234 assert(generic_signature_index_addr != NULL, "invariant");
1235 assert(parsed_annotations != NULL, "invariant");
1236 assert(attributes_count > 0, "attributes_count should be greater than 0");
1237
1238 u2 constantvalue_index = 0;
1239 u2 generic_signature_index = 0;
1240 bool is_synthetic = false;
1241 const u1* runtime_visible_annotations = NULL;
1242 int runtime_visible_annotations_length = 0;
1243 const u1* runtime_invisible_annotations = NULL;
1244 int runtime_invisible_annotations_length = 0;
1245 const u1* runtime_visible_type_annotations = NULL;
1246 int runtime_visible_type_annotations_length = 0;
1247 const u1* runtime_invisible_type_annotations = NULL;
1248 int runtime_invisible_type_annotations_length = 0;
1249 bool runtime_invisible_annotations_exists = false;
1250 bool runtime_invisible_type_annotations_exists = false;
1251 const ConstantPool* const cp = _cp;
1252
1253 while (attributes_count--) {
1254 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1255 const u2 attribute_name_index = cfs->get_u2_fast();
1256 const u4 attribute_length = cfs->get_u4_fast();
1257 check_property(valid_symbol_at(attribute_name_index),
1258 "Invalid field attribute index %u in class file %s",
1259 attribute_name_index,
1260 CHECK);
1261
1262 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1263 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1264 // ignore if non-static
1265 if (constantvalue_index != 0) {
1266 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1267 }
1268 check_property(
1269 attribute_length == 2,
1270 "Invalid ConstantValue field attribute length %u in class file %s",
1271 attribute_length, CHECK);
1272
1273 constantvalue_index = cfs->get_u2(CHECK);
1274 if (_need_verify) {
1275 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1276 }
1277 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1278 if (attribute_length != 0) {
1279 classfile_parse_error(
1280 "Invalid Synthetic field attribute length %u in class file %s",
1281 attribute_length, CHECK);
1282 }
1283 is_synthetic = true;
1284 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1285 if (attribute_length != 0) {
1286 classfile_parse_error(
1287 "Invalid Deprecated field attribute length %u in class file %s",
1288 attribute_length, CHECK);
1289 }
1290 } else if (_major_version >= JAVA_1_5_VERSION) {
1291 if (attribute_name == vmSymbols::tag_signature()) {
1292 if (generic_signature_index != 0) {
1293 classfile_parse_error(
1294 "Multiple Signature attributes for field in class file %s", CHECK);
1295 }
1296 if (attribute_length != 2) {
1297 classfile_parse_error(
1298 "Wrong size %u for field's Signature attribute in class file %s",
1299 attribute_length, CHECK);
1300 }
1301 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1302 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1303 if (runtime_visible_annotations != NULL) {
1304 classfile_parse_error(
1305 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1306 }
1307 runtime_visible_annotations_length = attribute_length;
1308 runtime_visible_annotations = cfs->get_u1_buffer();
1309 assert(runtime_visible_annotations != NULL, "null visible annotations");
1310 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1311 parse_annotations(cp,
1312 runtime_visible_annotations,
1313 runtime_visible_annotations_length,
1314 parsed_annotations,
1315 _loader_data,
1316 CHECK);
1317 cfs->skip_u1_fast(runtime_visible_annotations_length);
1318 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1319 if (runtime_invisible_annotations_exists) {
1320 classfile_parse_error(
1321 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1322 }
1323 runtime_invisible_annotations_exists = true;
1324 if (PreserveAllAnnotations) {
1325 runtime_invisible_annotations_length = attribute_length;
1326 runtime_invisible_annotations = cfs->get_u1_buffer();
1327 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1328 }
1329 cfs->skip_u1(attribute_length, CHECK);
1330 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1331 if (runtime_visible_type_annotations != NULL) {
1332 classfile_parse_error(
1333 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1334 }
1335 runtime_visible_type_annotations_length = attribute_length;
1336 runtime_visible_type_annotations = cfs->get_u1_buffer();
1337 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1338 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1339 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1340 if (runtime_invisible_type_annotations_exists) {
1341 classfile_parse_error(
1342 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1343 } else {
1344 runtime_invisible_type_annotations_exists = true;
1345 }
1346 if (PreserveAllAnnotations) {
1347 runtime_invisible_type_annotations_length = attribute_length;
1348 runtime_invisible_type_annotations = cfs->get_u1_buffer();
1349 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1350 }
1351 cfs->skip_u1(attribute_length, CHECK);
1352 } else {
1353 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1354 }
1355 } else {
1356 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1357 }
1358 }
1359
1360 *constantvalue_index_addr = constantvalue_index;
1361 *is_synthetic_addr = is_synthetic;
1362 *generic_signature_index_addr = generic_signature_index;
1363 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1364 runtime_visible_annotations_length,
1365 runtime_invisible_annotations,
1366 runtime_invisible_annotations_length,
1367 CHECK);
1368 parsed_annotations->set_field_annotations(a);
1369 a = assemble_annotations(runtime_visible_type_annotations,
1370 runtime_visible_type_annotations_length,
1371 runtime_invisible_type_annotations,
1372 runtime_invisible_type_annotations_length,
1373 CHECK);
1374 parsed_annotations->set_field_type_annotations(a);
1375 return;
1376 }
1377
1378
1379 // Field allocation types. Used for computing field offsets.
1380
1381 enum FieldAllocationType {
1382 STATIC_OOP, // Oops
1383 STATIC_BYTE, // Boolean, Byte, char
1384 STATIC_SHORT, // shorts
1385 STATIC_WORD, // ints
1386 STATIC_DOUBLE, // aligned long or double
1387 NONSTATIC_OOP,
1388 NONSTATIC_BYTE,
1389 NONSTATIC_SHORT,
1390 NONSTATIC_WORD,
1391 NONSTATIC_DOUBLE,
1392 MAX_FIELD_ALLOCATION_TYPE,
1393 BAD_ALLOCATION_TYPE = -1
1394 };
1395
1396 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1397 BAD_ALLOCATION_TYPE, // 0
1398 BAD_ALLOCATION_TYPE, // 1
1399 BAD_ALLOCATION_TYPE, // 2
1400 BAD_ALLOCATION_TYPE, // 3
1401 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1402 NONSTATIC_SHORT, // T_CHAR = 5,
1403 NONSTATIC_WORD, // T_FLOAT = 6,
1404 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1405 NONSTATIC_BYTE, // T_BYTE = 8,
1406 NONSTATIC_SHORT, // T_SHORT = 9,
1407 NONSTATIC_WORD, // T_INT = 10,
1408 NONSTATIC_DOUBLE, // T_LONG = 11,
1409 NONSTATIC_OOP, // T_OBJECT = 12,
1410 NONSTATIC_OOP, // T_ARRAY = 13,
1411 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1412 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1413 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1414 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1415 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1416 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1417 BAD_ALLOCATION_TYPE, // 0
1418 BAD_ALLOCATION_TYPE, // 1
1419 BAD_ALLOCATION_TYPE, // 2
1420 BAD_ALLOCATION_TYPE, // 3
1421 STATIC_BYTE , // T_BOOLEAN = 4,
1422 STATIC_SHORT, // T_CHAR = 5,
1423 STATIC_WORD, // T_FLOAT = 6,
1424 STATIC_DOUBLE, // T_DOUBLE = 7,
1425 STATIC_BYTE, // T_BYTE = 8,
1426 STATIC_SHORT, // T_SHORT = 9,
1427 STATIC_WORD, // T_INT = 10,
1428 STATIC_DOUBLE, // T_LONG = 11,
1429 STATIC_OOP, // T_OBJECT = 12,
1430 STATIC_OOP, // T_ARRAY = 13,
1431 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1432 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1433 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1434 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1435 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1436 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1437 };
1438
1439 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1440 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1441 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1442 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1443 return result;
1444 }
1445
1446 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1447 public:
1448 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1449
1450 FieldAllocationCount() {
1451 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1452 count[i] = 0;
1453 }
1454 }
1455
1456 FieldAllocationType update(bool is_static, BasicType type) {
1457 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1458 if (atype != BAD_ALLOCATION_TYPE) {
1459 // Make sure there is no overflow with injected fields.
1460 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1461 count[atype]++;
1462 }
1463 return atype;
1464 }
1465 };
1466
1467 // Side-effects: populates the _fields, _fields_annotations,
1468 // _fields_type_annotations fields
1469 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1470 bool is_interface,
1471 FieldAllocationCount* const fac,
1472 ConstantPool* cp,
1473 const int cp_size,
1474 u2* const java_fields_count_ptr,
1475 TRAPS) {
1476
1477 assert(cfs != NULL, "invariant");
1478 assert(fac != NULL, "invariant");
1479 assert(cp != NULL, "invariant");
1480 assert(java_fields_count_ptr != NULL, "invariant");
1481
1482 assert(NULL == _fields, "invariant");
1483 assert(NULL == _fields_annotations, "invariant");
1484 assert(NULL == _fields_type_annotations, "invariant");
1485
1486 cfs->guarantee_more(2, CHECK); // length
1487 const u2 length = cfs->get_u2_fast();
1488 *java_fields_count_ptr = length;
1489
1490 int num_injected = 0;
1491 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1492 &num_injected);
1493 const int total_fields = length + num_injected;
1494
1495 // The field array starts with tuples of shorts
1496 // [access, name index, sig index, initial value index, byte offset].
1497 // A generic signature slot only exists for field with generic
1498 // signature attribute. And the access flag is set with
1499 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1500 // signature slots are at the end of the field array and after all
1501 // other fields data.
1502 //
1503 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1504 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1505 // ...
1506 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1507 // [generic signature index]
1508 // [generic signature index]
1509 // ...
1510 //
1511 // Allocate a temporary resource array for field data. For each field,
1512 // a slot is reserved in the temporary array for the generic signature
1513 // index. After parsing all fields, the data are copied to a permanent
1514 // array and any unused slots will be discarded.
1515 ResourceMark rm(THREAD);
1516 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1517 u2,
1518 total_fields * (FieldInfo::field_slots + 1));
1519
1520 // The generic signature slots start after all other fields' data.
1521 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1522 int num_generic_signature = 0;
1523 for (int n = 0; n < length; n++) {
1524 // access_flags, name_index, descriptor_index, attributes_count
1525 cfs->guarantee_more(8, CHECK);
1526
1527 AccessFlags access_flags;
1528 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1529 verify_legal_field_modifiers(flags, is_interface, CHECK);
1530 access_flags.set_flags(flags);
1531
1532 const u2 name_index = cfs->get_u2_fast();
1533 check_property(valid_symbol_at(name_index),
1534 "Invalid constant pool index %u for field name in class file %s",
1535 name_index, CHECK);
1536 const Symbol* const name = cp->symbol_at(name_index);
1537 verify_legal_field_name(name, CHECK);
1538
1539 const u2 signature_index = cfs->get_u2_fast();
1540 check_property(valid_symbol_at(signature_index),
1541 "Invalid constant pool index %u for field signature in class file %s",
1542 signature_index, CHECK);
1543 const Symbol* const sig = cp->symbol_at(signature_index);
1544 verify_legal_field_signature(name, sig, CHECK);
1545
1546 u2 constantvalue_index = 0;
1547 bool is_synthetic = false;
1548 u2 generic_signature_index = 0;
1549 const bool is_static = access_flags.is_static();
1550 FieldAnnotationCollector parsed_annotations(_loader_data);
1551
1552 const u2 attributes_count = cfs->get_u2_fast();
1553 if (attributes_count > 0) {
1554 parse_field_attributes(cfs,
1555 attributes_count,
1556 is_static,
1557 signature_index,
1558 &constantvalue_index,
1559 &is_synthetic,
1560 &generic_signature_index,
1561 &parsed_annotations,
1562 CHECK);
1563
1564 if (parsed_annotations.field_annotations() != NULL) {
1565 if (_fields_annotations == NULL) {
1566 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1567 _loader_data, length, NULL,
1568 CHECK);
1569 }
1570 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1571 parsed_annotations.set_field_annotations(NULL);
1572 }
1573 if (parsed_annotations.field_type_annotations() != NULL) {
1574 if (_fields_type_annotations == NULL) {
1575 _fields_type_annotations =
1576 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1577 length,
1578 NULL,
1579 CHECK);
1580 }
1581 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1582 parsed_annotations.set_field_type_annotations(NULL);
1583 }
1584
1585 if (is_synthetic) {
1586 access_flags.set_is_synthetic();
1587 }
1588 if (generic_signature_index != 0) {
1589 access_flags.set_field_has_generic_signature();
1590 fa[generic_signature_slot] = generic_signature_index;
1591 generic_signature_slot ++;
1592 num_generic_signature ++;
1593 }
1594 }
1595
1596 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1597 field->initialize(access_flags.as_short(),
1598 name_index,
1599 signature_index,
1600 constantvalue_index);
1601 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1602
1603 // Remember how many oops we encountered and compute allocation type
1604 const FieldAllocationType atype = fac->update(is_static, type);
1605 field->set_allocation_type(atype);
1606
1607 // After field is initialized with type, we can augment it with aux info
1608 if (parsed_annotations.has_any_annotations())
1609 parsed_annotations.apply_to(field);
1610 }
1611
1612 int index = length;
1613 if (num_injected != 0) {
1614 for (int n = 0; n < num_injected; n++) {
1615 // Check for duplicates
1616 if (injected[n].may_be_java) {
1617 const Symbol* const name = injected[n].name();
1618 const Symbol* const signature = injected[n].signature();
1619 bool duplicate = false;
1620 for (int i = 0; i < length; i++) {
1621 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1622 if (name == cp->symbol_at(f->name_index()) &&
1623 signature == cp->symbol_at(f->signature_index())) {
1624 // Symbol is desclared in Java so skip this one
1625 duplicate = true;
1626 break;
1627 }
1628 }
1629 if (duplicate) {
1630 // These will be removed from the field array at the end
1631 continue;
1632 }
1633 }
1634
1635 // Injected field
1636 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1637 field->initialize(JVM_ACC_FIELD_INTERNAL,
1638 injected[n].name_index,
1639 injected[n].signature_index,
1640 0);
1641
1642 const BasicType type = FieldType::basic_type(injected[n].signature());
1643
1644 // Remember how many oops we encountered and compute allocation type
1645 const FieldAllocationType atype = fac->update(false, type);
1646 field->set_allocation_type(atype);
1647 index++;
1648 }
1649 }
1650
1651 assert(NULL == _fields, "invariant");
1652
1653 _fields =
1654 MetadataFactory::new_array<u2>(_loader_data,
1655 index * FieldInfo::field_slots + num_generic_signature,
1656 CHECK);
1657 // Sometimes injected fields already exist in the Java source so
1658 // the fields array could be too long. In that case the
1659 // fields array is trimed. Also unused slots that were reserved
1660 // for generic signature indexes are discarded.
1661 {
1662 int i = 0;
1663 for (; i < index * FieldInfo::field_slots; i++) {
1664 _fields->at_put(i, fa[i]);
1665 }
1666 for (int j = total_fields * FieldInfo::field_slots;
1667 j < generic_signature_slot; j++) {
1668 _fields->at_put(i++, fa[j]);
1669 }
1670 assert(_fields->length() == i, "");
1671 }
1672
1673 if (_need_verify && length > 1) {
1674 // Check duplicated fields
1675 ResourceMark rm(THREAD);
1676 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1677 THREAD, NameSigHash*, HASH_ROW_SIZE);
1678 initialize_hashtable(names_and_sigs);
1679 bool dup = false;
1680 const Symbol* name = NULL;
1681 const Symbol* sig = NULL;
1682 {
1683 debug_only(NoSafepointVerifier nsv;)
1684 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1685 name = fs.name();
1686 sig = fs.signature();
1687 // If no duplicates, add name/signature in hashtable names_and_sigs.
1688 if (!put_after_lookup(name, sig, names_and_sigs)) {
1689 dup = true;
1690 break;
1691 }
1692 }
1693 }
1694 if (dup) {
1695 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1696 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1697 }
1698 }
1699 }
1700
1701
1702 static void copy_u2_with_conversion(u2* dest, const u2* src, int length) {
1703 while (length-- > 0) {
1704 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1705 }
1706 }
1707
1708 const u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1709 u4 code_length,
1710 u4 exception_table_length,
1711 TRAPS) {
1712 assert(cfs != NULL, "invariant");
1713
1714 const u2* const exception_table_start = cfs->get_u2_buffer();
1715 assert(exception_table_start != NULL, "null exception table");
1716
1717 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1718 // end_pc,
1719 // handler_pc,
1720 // catch_type_index
1721
1722 // Will check legal target after parsing code array in verifier.
1723 if (_need_verify) {
1724 for (unsigned int i = 0; i < exception_table_length; i++) {
1725 const u2 start_pc = cfs->get_u2_fast();
1726 const u2 end_pc = cfs->get_u2_fast();
1727 const u2 handler_pc = cfs->get_u2_fast();
1728 const u2 catch_type_index = cfs->get_u2_fast();
1729 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1730 "Illegal exception table range in class file %s",
1731 CHECK_NULL);
1732 guarantee_property(handler_pc < code_length,
1733 "Illegal exception table handler in class file %s",
1734 CHECK_NULL);
1735 if (catch_type_index != 0) {
1736 guarantee_property(valid_klass_reference_at(catch_type_index),
1737 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1738 }
1739 }
1740 } else {
1741 cfs->skip_u2_fast(exception_table_length * 4);
1742 }
1743 return exception_table_start;
1744 }
1745
1746 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1747 u4 code_length,
1748 CompressedLineNumberWriteStream**const write_stream,
1749 TRAPS) {
1750
1751 const ClassFileStream* const cfs = _stream;
1752 unsigned int num_entries = cfs->get_u2(CHECK);
1753
1754 // Each entry is a u2 start_pc, and a u2 line_number
1755 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1756
1757 // Verify line number attribute and table length
1758 check_property(
1759 code_attribute_length == sizeof(u2) + length_in_bytes,
1760 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1761
1762 cfs->guarantee_more(length_in_bytes, CHECK);
1763
1764 if ((*write_stream) == NULL) {
1765 if (length_in_bytes > fixed_buffer_size) {
1766 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1767 } else {
1768 (*write_stream) = new CompressedLineNumberWriteStream(
1769 _linenumbertable_buffer, fixed_buffer_size);
1770 }
1771 }
1772
1773 while (num_entries-- > 0) {
1774 const u2 bci = cfs->get_u2_fast(); // start_pc
1775 const u2 line = cfs->get_u2_fast(); // line_number
1776 guarantee_property(bci < code_length,
1777 "Invalid pc in LineNumberTable in class file %s", CHECK);
1778 (*write_stream)->write_pair(bci, line);
1779 }
1780 }
1781
1782
1783 class LVT_Hash : public AllStatic {
1784 public:
1785
1786 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1787 /*
1788 * 3-tuple start_bci/length/slot has to be unique key,
1789 * so the following comparison seems to be redundant:
1790 * && elem->name_cp_index == entry->_elem->name_cp_index
1791 */
1792 return (e0.start_bci == e1.start_bci &&
1793 e0.length == e1.length &&
1794 e0.name_cp_index == e1.name_cp_index &&
1795 e0.slot == e1.slot);
1796 }
1797
1798 static unsigned int hash(LocalVariableTableElement const& e0) {
1799 unsigned int raw_hash = e0.start_bci;
1800
1801 raw_hash = e0.length + raw_hash * 37;
1802 raw_hash = e0.name_cp_index + raw_hash * 37;
1803 raw_hash = e0.slot + raw_hash * 37;
1804
1805 return raw_hash;
1806 }
1807 };
1808
1809
1810 // Class file LocalVariableTable elements.
1811 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1812 public:
1813 u2 start_bci;
1814 u2 length;
1815 u2 name_cp_index;
1816 u2 descriptor_cp_index;
1817 u2 slot;
1818 };
1819
1820 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1821 LocalVariableTableElement* const lvt) {
1822 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1823 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1824 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1825 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1826 lvt->signature_cp_index = 0;
1827 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1828 }
1829
1830 // Function is used to parse both attributes:
1831 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1832 const u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1833 u4 code_length,
1834 u2 max_locals,
1835 u4 code_attribute_length,
1836 u2* const localvariable_table_length,
1837 bool isLVTT,
1838 TRAPS) {
1839 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1840 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1841 const unsigned int size =
1842 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1843
1844 const ConstantPool* const cp = _cp;
1845
1846 // Verify local variable table attribute has right length
1847 if (_need_verify) {
1848 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1849 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1850 }
1851
1852 const u2* const localvariable_table_start = cfs->get_u2_buffer();
1853 assert(localvariable_table_start != NULL, "null local variable table");
1854 if (!_need_verify) {
1855 cfs->skip_u2_fast(size);
1856 } else {
1857 cfs->guarantee_more(size * 2, CHECK_NULL);
1858 for(int i = 0; i < (*localvariable_table_length); i++) {
1859 const u2 start_pc = cfs->get_u2_fast();
1860 const u2 length = cfs->get_u2_fast();
1861 const u2 name_index = cfs->get_u2_fast();
1862 const u2 descriptor_index = cfs->get_u2_fast();
1863 const u2 index = cfs->get_u2_fast();
1864 // Assign to a u4 to avoid overflow
1865 const u4 end_pc = (u4)start_pc + (u4)length;
1866
1867 if (start_pc >= code_length) {
1868 classfile_parse_error(
1869 "Invalid start_pc %u in %s in class file %s",
1870 start_pc, tbl_name, CHECK_NULL);
1871 }
1872 if (end_pc > code_length) {
1873 classfile_parse_error(
1874 "Invalid length %u in %s in class file %s",
1875 length, tbl_name, CHECK_NULL);
1876 }
1877 const int cp_size = cp->length();
1878 guarantee_property(valid_symbol_at(name_index),
1879 "Name index %u in %s has bad constant type in class file %s",
1880 name_index, tbl_name, CHECK_NULL);
1881 guarantee_property(valid_symbol_at(descriptor_index),
1882 "Signature index %u in %s has bad constant type in class file %s",
1883 descriptor_index, tbl_name, CHECK_NULL);
1884
1885 const Symbol* const name = cp->symbol_at(name_index);
1886 const Symbol* const sig = cp->symbol_at(descriptor_index);
1887 verify_legal_field_name(name, CHECK_NULL);
1888 u2 extra_slot = 0;
1889 if (!isLVTT) {
1890 verify_legal_field_signature(name, sig, CHECK_NULL);
1891
1892 // 4894874: check special cases for double and long local variables
1893 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1894 sig == vmSymbols::type_signature(T_LONG)) {
1895 extra_slot = 1;
1896 }
1897 }
1898 guarantee_property((index + extra_slot) < max_locals,
1899 "Invalid index %u in %s in class file %s",
1900 index, tbl_name, CHECK_NULL);
1901 }
1902 }
1903 return localvariable_table_start;
1904 }
1905
1906
1907 void ClassFileParser::parse_type_array(u2 array_length,
1908 u4 code_length,
1909 u4* const u1_index,
1910 u4* const u2_index,
1911 u1* const u1_array,
1912 u2* const u2_array,
1913 TRAPS) {
1914 const ClassFileStream* const cfs = _stream;
1915 u2 index = 0; // index in the array with long/double occupying two slots
1916 u4 i1 = *u1_index;
1917 u4 i2 = *u2_index + 1;
1918 for(int i = 0; i < array_length; i++) {
1919 const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1920 index++;
1921 if (tag == ITEM_Long || tag == ITEM_Double) {
1922 index++;
1923 } else if (tag == ITEM_Object) {
1924 const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1925 guarantee_property(valid_klass_reference_at(class_index),
1926 "Bad class index %u in StackMap in class file %s",
1927 class_index, CHECK);
1928 } else if (tag == ITEM_Uninitialized) {
1929 const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1930 guarantee_property(
1931 offset < code_length,
1932 "Bad uninitialized type offset %u in StackMap in class file %s",
1933 offset, CHECK);
1934 } else {
1935 guarantee_property(
1936 tag <= (u1)ITEM_Uninitialized,
1937 "Unknown variable type %u in StackMap in class file %s",
1938 tag, CHECK);
1939 }
1940 }
1941 u2_array[*u2_index] = index;
1942 *u1_index = i1;
1943 *u2_index = i2;
1944 }
1945
1946 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1947 u4 code_attribute_length,
1948 bool need_verify,
1949 TRAPS) {
1950 assert(cfs != NULL, "invariant");
1951
1952 if (0 == code_attribute_length) {
1953 return NULL;
1954 }
1955
1956 const u1* const stackmap_table_start = cfs->get_u1_buffer();
1957 assert(stackmap_table_start != NULL, "null stackmap table");
1958
1959 // check code_attribute_length first
1960 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1961
1962 if (!need_verify && !DumpSharedSpaces) {
1963 return NULL;
1964 }
1965 return stackmap_table_start;
1966 }
1967
1968 const u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1969 u2* const checked_exceptions_length,
1970 u4 method_attribute_length,
1971 TRAPS) {
1972 assert(cfs != NULL, "invariant");
1973 assert(checked_exceptions_length != NULL, "invariant");
1974
1975 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1976 *checked_exceptions_length = cfs->get_u2_fast();
1977 const unsigned int size =
1978 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1979 const u2* const checked_exceptions_start = cfs->get_u2_buffer();
1980 assert(checked_exceptions_start != NULL, "null checked exceptions");
1981 if (!_need_verify) {
1982 cfs->skip_u2_fast(size);
1983 } else {
1984 // Verify each value in the checked exception table
1985 u2 checked_exception;
1986 const u2 len = *checked_exceptions_length;
1987 cfs->guarantee_more(2 * len, CHECK_NULL);
1988 for (int i = 0; i < len; i++) {
1989 checked_exception = cfs->get_u2_fast();
1990 check_property(
1991 valid_klass_reference_at(checked_exception),
1992 "Exception name has bad type at constant pool %u in class file %s",
1993 checked_exception, CHECK_NULL);
1994 }
1995 }
1996 // check exceptions attribute length
1997 if (_need_verify) {
1998 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1999 sizeof(u2) * size),
2000 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2001 }
2002 return checked_exceptions_start;
2003 }
2004
2005 void ClassFileParser::throwIllegalSignature(const char* type,
2006 const Symbol* name,
2007 const Symbol* sig,
2008 TRAPS) const {
2009 assert(name != NULL, "invariant");
2010 assert(sig != NULL, "invariant");
2011
2012 ResourceMark rm(THREAD);
2013 Exceptions::fthrow(THREAD_AND_LOCATION,
2014 vmSymbols::java_lang_ClassFormatError(),
2015 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2016 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2017 }
2018
2019 AnnotationCollector::ID
2020 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2021 const Symbol* name) {
2022 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2023 // Privileged code can use all annotations. Other code silently drops some.
2024 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2025 loader_data->is_platform_class_loader_data() ||
2026 loader_data->is_anonymous();
2027 switch (sid) {
2028 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2029 if (_location != _in_method) break; // only allow for methods
2030 if (!privileged) break; // only allow in privileged code
2031 return _method_CallerSensitive;
2032 }
2033 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2034 if (_location != _in_method) break; // only allow for methods
2035 if (!privileged) break; // only allow in privileged code
2036 return _method_ForceInline;
2037 }
2038 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2039 if (_location != _in_method) break; // only allow for methods
2040 if (!privileged) break; // only allow in privileged code
2041 return _method_DontInline;
2042 }
2043 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2044 if (_location != _in_method) break; // only allow for methods
2045 if (!privileged) break; // only allow in privileged code
2046 return _method_InjectedProfile;
2047 }
2048 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2049 if (_location != _in_method) break; // only allow for methods
2050 if (!privileged) break; // only allow in privileged code
2051 return _method_LambdaForm_Compiled;
2052 }
2053 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): {
2054 if (_location != _in_method) break; // only allow for methods
2055 if (!privileged) break; // only allow in privileged code
2056 return _method_LambdaForm_Hidden;
2057 }
2058 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2059 if (_location != _in_method) break; // only allow for methods
2060 if (!privileged) break; // only allow in privileged code
2061 return _method_HotSpotIntrinsicCandidate;
2062 }
2063 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2064 if (_location != _in_field) break; // only allow for fields
2065 if (!privileged) break; // only allow in privileged code
2066 return _field_Stable;
2067 }
2068 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2069 if (_location != _in_field && _location != _in_class) {
2070 break; // only allow for fields and classes
2071 }
2072 if (!EnableContended || (RestrictContended && !privileged)) {
2073 break; // honor privileges
2074 }
2075 return _jdk_internal_vm_annotation_Contended;
2076 }
2077 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2078 if (_location != _in_method) break; // only allow for methods
2079 if (RestrictReservedStack && !privileged) break; // honor privileges
2080 return _jdk_internal_vm_annotation_ReservedStackAccess;
2081 }
2082 default: {
2083 break;
2084 }
2085 }
2086 return AnnotationCollector::_unknown;
2087 }
2088
2089 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2090 if (is_contended())
2091 f->set_contended_group(contended_group());
2092 if (is_stable())
2093 f->set_stable(true);
2094 }
2095
2096 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2097 // If there's an error deallocate metadata for field annotations
2098 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2099 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2100 }
2101
2102 void MethodAnnotationCollector::apply_to(methodHandle m) {
2103 if (has_annotation(_method_CallerSensitive))
2104 m->set_caller_sensitive(true);
2105 if (has_annotation(_method_ForceInline))
2106 m->set_force_inline(true);
2107 if (has_annotation(_method_DontInline))
2108 m->set_dont_inline(true);
2109 if (has_annotation(_method_InjectedProfile))
2110 m->set_has_injected_profile(true);
2111 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2112 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2113 if (has_annotation(_method_LambdaForm_Hidden))
2114 m->set_hidden(true);
2115 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2116 m->set_intrinsic_candidate(true);
2117 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2118 m->set_has_reserved_stack_access(true);
2119 }
2120
2121 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2122 assert(ik != NULL, "invariant");
2123 ik->set_is_contended(is_contended());
2124 }
2125
2126 #define MAX_ARGS_SIZE 255
2127 #define MAX_CODE_SIZE 65535
2128 #define INITIAL_MAX_LVT_NUMBER 256
2129
2130 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2131 *
2132 * Rules for LVT's and LVTT's are:
2133 * - There can be any number of LVT's and LVTT's.
2134 * - If there are n LVT's, it is the same as if there was just
2135 * one LVT containing all the entries from the n LVT's.
2136 * - There may be no more than one LVT entry per local variable.
2137 * Two LVT entries are 'equal' if these fields are the same:
2138 * start_pc, length, name, slot
2139 * - There may be no more than one LVTT entry per each LVT entry.
2140 * Each LVTT entry has to match some LVT entry.
2141 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2142 */
2143 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2144 int lvt_cnt,
2145 u2* const localvariable_table_length,
2146 const u2**const localvariable_table_start,
2147 int lvtt_cnt,
2148 u2* const localvariable_type_table_length,
2149 const u2**const localvariable_type_table_start,
2150 TRAPS) {
2151
2152 ResourceMark rm(THREAD);
2153
2154 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2155 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2156
2157 LVT_HashTable* const table = new LVT_HashTable();
2158
2159 // To fill LocalVariableTable in
2160 const Classfile_LVT_Element* cf_lvt;
2161 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2162
2163 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2164 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2165 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2166 copy_lvt_element(&cf_lvt[idx], lvt);
2167 // If no duplicates, add LVT elem in hashtable.
2168 if (table->put(*lvt, lvt) == false
2169 && _need_verify
2170 && _major_version >= JAVA_1_5_VERSION) {
2171 classfile_parse_error("Duplicated LocalVariableTable attribute "
2172 "entry for '%s' in class file %s",
2173 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2174 CHECK);
2175 }
2176 }
2177 }
2178
2179 // To merge LocalVariableTable and LocalVariableTypeTable
2180 const Classfile_LVT_Element* cf_lvtt;
2181 LocalVariableTableElement lvtt_elem;
2182
2183 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2184 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2185 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2186 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2187 LocalVariableTableElement** entry = table->get(lvtt_elem);
2188 if (entry == NULL) {
2189 if (_need_verify) {
2190 classfile_parse_error("LVTT entry for '%s' in class file %s "
2191 "does not match any LVT entry",
2192 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2193 CHECK);
2194 }
2195 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2196 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2197 "entry for '%s' in class file %s",
2198 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2199 CHECK);
2200 } else {
2201 // to add generic signatures into LocalVariableTable
2202 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2203 }
2204 }
2205 }
2206 }
2207
2208
2209 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2210 const u1* runtime_visible_annotations,
2211 int runtime_visible_annotations_length,
2212 const u1* runtime_invisible_annotations,
2213 int runtime_invisible_annotations_length,
2214 const u1* runtime_visible_parameter_annotations,
2215 int runtime_visible_parameter_annotations_length,
2216 const u1* runtime_invisible_parameter_annotations,
2217 int runtime_invisible_parameter_annotations_length,
2218 const u1* runtime_visible_type_annotations,
2219 int runtime_visible_type_annotations_length,
2220 const u1* runtime_invisible_type_annotations,
2221 int runtime_invisible_type_annotations_length,
2222 const u1* annotation_default,
2223 int annotation_default_length,
2224 TRAPS) {
2225
2226 AnnotationArray* a;
2227
2228 if (runtime_visible_annotations_length +
2229 runtime_invisible_annotations_length > 0) {
2230 a = assemble_annotations(runtime_visible_annotations,
2231 runtime_visible_annotations_length,
2232 runtime_invisible_annotations,
2233 runtime_invisible_annotations_length,
2234 CHECK);
2235 cm->set_method_annotations(a);
2236 }
2237
2238 if (runtime_visible_parameter_annotations_length +
2239 runtime_invisible_parameter_annotations_length > 0) {
2240 a = assemble_annotations(runtime_visible_parameter_annotations,
2241 runtime_visible_parameter_annotations_length,
2242 runtime_invisible_parameter_annotations,
2243 runtime_invisible_parameter_annotations_length,
2244 CHECK);
2245 cm->set_parameter_annotations(a);
2246 }
2247
2248 if (annotation_default_length > 0) {
2249 a = assemble_annotations(annotation_default,
2250 annotation_default_length,
2251 NULL,
2252 0,
2253 CHECK);
2254 cm->set_default_annotations(a);
2255 }
2256
2257 if (runtime_visible_type_annotations_length +
2258 runtime_invisible_type_annotations_length > 0) {
2259 a = assemble_annotations(runtime_visible_type_annotations,
2260 runtime_visible_type_annotations_length,
2261 runtime_invisible_type_annotations,
2262 runtime_invisible_type_annotations_length,
2263 CHECK);
2264 cm->set_type_annotations(a);
2265 }
2266 }
2267
2268
2269 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2270 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2271 // Method* to save footprint, so we only know the size of the resulting Method* when the
2272 // entire method attribute is parsed.
2273 //
2274 // The promoted_flags parameter is used to pass relevant access_flags
2275 // from the method back up to the containing klass. These flag values
2276 // are added to klass's access_flags.
2277
2278 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2279 bool is_interface,
2280 const ConstantPool* cp,
2281 AccessFlags* const promoted_flags,
2282 TRAPS) {
2283 assert(cfs != NULL, "invariant");
2284 assert(cp != NULL, "invariant");
2285 assert(promoted_flags != NULL, "invariant");
2286
2287 ResourceMark rm(THREAD);
2288 // Parse fixed parts:
2289 // access_flags, name_index, descriptor_index, attributes_count
2290 cfs->guarantee_more(8, CHECK_NULL);
2291
2292 int flags = cfs->get_u2_fast();
2293 const u2 name_index = cfs->get_u2_fast();
2294 const int cp_size = cp->length();
2295 check_property(
2296 valid_symbol_at(name_index),
2297 "Illegal constant pool index %u for method name in class file %s",
2298 name_index, CHECK_NULL);
2299 const Symbol* const name = cp->symbol_at(name_index);
2300 verify_legal_method_name(name, CHECK_NULL);
2301
2302 const u2 signature_index = cfs->get_u2_fast();
2303 guarantee_property(
2304 valid_symbol_at(signature_index),
2305 "Illegal constant pool index %u for method signature in class file %s",
2306 signature_index, CHECK_NULL);
2307 const Symbol* const signature = cp->symbol_at(signature_index);
2308
2309 if (name == vmSymbols::class_initializer_name()) {
2310 // We ignore the other access flags for a valid class initializer.
2311 // (JVM Spec 2nd ed., chapter 4.6)
2312 if (_major_version < 51) { // backward compatibility
2313 flags = JVM_ACC_STATIC;
2314 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2315 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2316 } else {
2317 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2318 }
2319 } else {
2320 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2321 }
2322
2323 if (name == vmSymbols::object_initializer_name() && is_interface) {
2324 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2325 }
2326
2327 int args_size = -1; // only used when _need_verify is true
2328 if (_need_verify) {
2329 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2330 verify_legal_method_signature(name, signature, CHECK_NULL);
2331 if (args_size > MAX_ARGS_SIZE) {
2332 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2333 }
2334 }
2335
2336 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2337
2338 // Default values for code and exceptions attribute elements
2339 u2 max_stack = 0;
2340 u2 max_locals = 0;
2341 u4 code_length = 0;
2342 const u1* code_start = 0;
2343 u2 exception_table_length = 0;
2344 const u2* exception_table_start = NULL;
2345 Array<int>* exception_handlers = Universe::the_empty_int_array();
2346 u2 checked_exceptions_length = 0;
2347 const u2* checked_exceptions_start = NULL;
2348 CompressedLineNumberWriteStream* linenumber_table = NULL;
2349 int linenumber_table_length = 0;
2350 int total_lvt_length = 0;
2351 u2 lvt_cnt = 0;
2352 u2 lvtt_cnt = 0;
2353 bool lvt_allocated = false;
2354 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2355 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2356 u2* localvariable_table_length = NULL;
2357 const u2** localvariable_table_start = NULL;
2358 u2* localvariable_type_table_length = NULL;
2359 const u2** localvariable_type_table_start = NULL;
2360 int method_parameters_length = -1;
2361 const u1* method_parameters_data = NULL;
2362 bool method_parameters_seen = false;
2363 bool parsed_code_attribute = false;
2364 bool parsed_checked_exceptions_attribute = false;
2365 bool parsed_stackmap_attribute = false;
2366 // stackmap attribute - JDK1.5
2367 const u1* stackmap_data = NULL;
2368 int stackmap_data_length = 0;
2369 u2 generic_signature_index = 0;
2370 MethodAnnotationCollector parsed_annotations;
2371 const u1* runtime_visible_annotations = NULL;
2372 int runtime_visible_annotations_length = 0;
2373 const u1* runtime_invisible_annotations = NULL;
2374 int runtime_invisible_annotations_length = 0;
2375 const u1* runtime_visible_parameter_annotations = NULL;
2376 int runtime_visible_parameter_annotations_length = 0;
2377 const u1* runtime_invisible_parameter_annotations = NULL;
2378 int runtime_invisible_parameter_annotations_length = 0;
2379 const u1* runtime_visible_type_annotations = NULL;
2380 int runtime_visible_type_annotations_length = 0;
2381 const u1* runtime_invisible_type_annotations = NULL;
2382 int runtime_invisible_type_annotations_length = 0;
2383 bool runtime_invisible_annotations_exists = false;
2384 bool runtime_invisible_type_annotations_exists = false;
2385 bool runtime_invisible_parameter_annotations_exists = false;
2386 const u1* annotation_default = NULL;
2387 int annotation_default_length = 0;
2388
2389 // Parse code and exceptions attribute
2390 u2 method_attributes_count = cfs->get_u2_fast();
2391 while (method_attributes_count--) {
2392 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2393 const u2 method_attribute_name_index = cfs->get_u2_fast();
2394 const u4 method_attribute_length = cfs->get_u4_fast();
2395 check_property(
2396 valid_symbol_at(method_attribute_name_index),
2397 "Invalid method attribute name index %u in class file %s",
2398 method_attribute_name_index, CHECK_NULL);
2399
2400 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2401 if (method_attribute_name == vmSymbols::tag_code()) {
2402 // Parse Code attribute
2403 if (_need_verify) {
2404 guarantee_property(
2405 !access_flags.is_native() && !access_flags.is_abstract(),
2406 "Code attribute in native or abstract methods in class file %s",
2407 CHECK_NULL);
2408 }
2409 if (parsed_code_attribute) {
2410 classfile_parse_error("Multiple Code attributes in class file %s",
2411 CHECK_NULL);
2412 }
2413 parsed_code_attribute = true;
2414
2415 // Stack size, locals size, and code size
2416 if (_major_version == 45 && _minor_version <= 2) {
2417 cfs->guarantee_more(4, CHECK_NULL);
2418 max_stack = cfs->get_u1_fast();
2419 max_locals = cfs->get_u1_fast();
2420 code_length = cfs->get_u2_fast();
2421 } else {
2422 cfs->guarantee_more(8, CHECK_NULL);
2423 max_stack = cfs->get_u2_fast();
2424 max_locals = cfs->get_u2_fast();
2425 code_length = cfs->get_u4_fast();
2426 }
2427 if (_need_verify) {
2428 guarantee_property(args_size <= max_locals,
2429 "Arguments can't fit into locals in class file %s",
2430 CHECK_NULL);
2431 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2432 "Invalid method Code length %u in class file %s",
2433 code_length, CHECK_NULL);
2434 }
2435 // Code pointer
2436 code_start = cfs->get_u1_buffer();
2437 assert(code_start != NULL, "null code start");
2438 cfs->guarantee_more(code_length, CHECK_NULL);
2439 cfs->skip_u1_fast(code_length);
2440
2441 // Exception handler table
2442 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2443 exception_table_length = cfs->get_u2_fast();
2444 if (exception_table_length > 0) {
2445 exception_table_start = parse_exception_table(cfs,
2446 code_length,
2447 exception_table_length,
2448 CHECK_NULL);
2449 }
2450
2451 // Parse additional attributes in code attribute
2452 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2453 u2 code_attributes_count = cfs->get_u2_fast();
2454
2455 unsigned int calculated_attribute_length = 0;
2456
2457 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2458 calculated_attribute_length =
2459 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2460 } else {
2461 // max_stack, locals and length are smaller in pre-version 45.2 classes
2462 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2463 }
2464 calculated_attribute_length +=
2465 code_length +
2466 sizeof(exception_table_length) +
2467 sizeof(code_attributes_count) +
2468 exception_table_length *
2469 ( sizeof(u2) + // start_pc
2470 sizeof(u2) + // end_pc
2471 sizeof(u2) + // handler_pc
2472 sizeof(u2) ); // catch_type_index
2473
2474 while (code_attributes_count--) {
2475 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2476 const u2 code_attribute_name_index = cfs->get_u2_fast();
2477 const u4 code_attribute_length = cfs->get_u4_fast();
2478 calculated_attribute_length += code_attribute_length +
2479 sizeof(code_attribute_name_index) +
2480 sizeof(code_attribute_length);
2481 check_property(valid_symbol_at(code_attribute_name_index),
2482 "Invalid code attribute name index %u in class file %s",
2483 code_attribute_name_index,
2484 CHECK_NULL);
2485 if (LoadLineNumberTables &&
2486 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2487 // Parse and compress line number table
2488 parse_linenumber_table(code_attribute_length,
2489 code_length,
2490 &linenumber_table,
2491 CHECK_NULL);
2492
2493 } else if (LoadLocalVariableTables &&
2494 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2495 // Parse local variable table
2496 if (!lvt_allocated) {
2497 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2498 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2499 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2500 THREAD, const u2*, INITIAL_MAX_LVT_NUMBER);
2501 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2502 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2503 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2504 THREAD, const u2*, INITIAL_MAX_LVT_NUMBER);
2505 lvt_allocated = true;
2506 }
2507 if (lvt_cnt == max_lvt_cnt) {
2508 max_lvt_cnt <<= 1;
2509 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2510 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2511 }
2512 localvariable_table_start[lvt_cnt] =
2513 parse_localvariable_table(cfs,
2514 code_length,
2515 max_locals,
2516 code_attribute_length,
2517 &localvariable_table_length[lvt_cnt],
2518 false, // is not LVTT
2519 CHECK_NULL);
2520 total_lvt_length += localvariable_table_length[lvt_cnt];
2521 lvt_cnt++;
2522 } else if (LoadLocalVariableTypeTables &&
2523 _major_version >= JAVA_1_5_VERSION &&
2524 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2525 if (!lvt_allocated) {
2526 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2527 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2528 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2529 THREAD, const u2*, INITIAL_MAX_LVT_NUMBER);
2530 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2531 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2532 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2533 THREAD, const u2*, INITIAL_MAX_LVT_NUMBER);
2534 lvt_allocated = true;
2535 }
2536 // Parse local variable type table
2537 if (lvtt_cnt == max_lvtt_cnt) {
2538 max_lvtt_cnt <<= 1;
2539 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2540 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2541 }
2542 localvariable_type_table_start[lvtt_cnt] =
2543 parse_localvariable_table(cfs,
2544 code_length,
2545 max_locals,
2546 code_attribute_length,
2547 &localvariable_type_table_length[lvtt_cnt],
2548 true, // is LVTT
2549 CHECK_NULL);
2550 lvtt_cnt++;
2551 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2552 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2553 // Stack map is only needed by the new verifier in JDK1.5.
2554 if (parsed_stackmap_attribute) {
2555 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2556 }
2557 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2558 stackmap_data_length = code_attribute_length;
2559 parsed_stackmap_attribute = true;
2560 } else {
2561 // Skip unknown attributes
2562 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2563 }
2564 }
2565 // check method attribute length
2566 if (_need_verify) {
2567 guarantee_property(method_attribute_length == calculated_attribute_length,
2568 "Code segment has wrong length in class file %s",
2569 CHECK_NULL);
2570 }
2571 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2572 // Parse Exceptions attribute
2573 if (parsed_checked_exceptions_attribute) {
2574 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2575 CHECK_NULL);
2576 }
2577 parsed_checked_exceptions_attribute = true;
2578 checked_exceptions_start =
2579 parse_checked_exceptions(cfs,
2580 &checked_exceptions_length,
2581 method_attribute_length,
2582 CHECK_NULL);
2583 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2584 // reject multiple method parameters
2585 if (method_parameters_seen) {
2586 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2587 CHECK_NULL);
2588 }
2589 method_parameters_seen = true;
2590 method_parameters_length = cfs->get_u1_fast();
2591 const u2 real_length = (method_parameters_length * 4u) + 1u;
2592 if (method_attribute_length != real_length) {
2593 classfile_parse_error(
2594 "Invalid MethodParameters method attribute length %u in class file",
2595 method_attribute_length, CHECK_NULL);
2596 }
2597 method_parameters_data = cfs->get_u1_buffer();
2598 cfs->skip_u2_fast(method_parameters_length);
2599 cfs->skip_u2_fast(method_parameters_length);
2600 // ignore this attribute if it cannot be reflected
2601 if (!SystemDictionary::Parameter_klass_loaded())
2602 method_parameters_length = -1;
2603 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2604 if (method_attribute_length != 0) {
2605 classfile_parse_error(
2606 "Invalid Synthetic method attribute length %u in class file %s",
2607 method_attribute_length, CHECK_NULL);
2608 }
2609 // Should we check that there hasn't already been a synthetic attribute?
2610 access_flags.set_is_synthetic();
2611 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2612 if (method_attribute_length != 0) {
2613 classfile_parse_error(
2614 "Invalid Deprecated method attribute length %u in class file %s",
2615 method_attribute_length, CHECK_NULL);
2616 }
2617 } else if (_major_version >= JAVA_1_5_VERSION) {
2618 if (method_attribute_name == vmSymbols::tag_signature()) {
2619 if (generic_signature_index != 0) {
2620 classfile_parse_error(
2621 "Multiple Signature attributes for method in class file %s",
2622 CHECK_NULL);
2623 }
2624 if (method_attribute_length != 2) {
2625 classfile_parse_error(
2626 "Invalid Signature attribute length %u in class file %s",
2627 method_attribute_length, CHECK_NULL);
2628 }
2629 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2630 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2631 if (runtime_visible_annotations != NULL) {
2632 classfile_parse_error(
2633 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2634 CHECK_NULL);
2635 }
2636 runtime_visible_annotations_length = method_attribute_length;
2637 runtime_visible_annotations = cfs->get_u1_buffer();
2638 assert(runtime_visible_annotations != NULL, "null visible annotations");
2639 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2640 parse_annotations(cp,
2641 runtime_visible_annotations,
2642 runtime_visible_annotations_length,
2643 &parsed_annotations,
2644 _loader_data,
2645 CHECK_NULL);
2646 cfs->skip_u1_fast(runtime_visible_annotations_length);
2647 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2648 if (runtime_invisible_annotations_exists) {
2649 classfile_parse_error(
2650 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2651 CHECK_NULL);
2652 }
2653 runtime_invisible_annotations_exists = true;
2654 if (PreserveAllAnnotations) {
2655 runtime_invisible_annotations_length = method_attribute_length;
2656 runtime_invisible_annotations = cfs->get_u1_buffer();
2657 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2658 }
2659 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2660 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2661 if (runtime_visible_parameter_annotations != NULL) {
2662 classfile_parse_error(
2663 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2664 CHECK_NULL);
2665 }
2666 runtime_visible_parameter_annotations_length = method_attribute_length;
2667 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2668 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2669 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2670 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2671 if (runtime_invisible_parameter_annotations_exists) {
2672 classfile_parse_error(
2673 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2674 CHECK_NULL);
2675 }
2676 runtime_invisible_parameter_annotations_exists = true;
2677 if (PreserveAllAnnotations) {
2678 runtime_invisible_parameter_annotations_length = method_attribute_length;
2679 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2680 assert(runtime_invisible_parameter_annotations != NULL,
2681 "null invisible parameter annotations");
2682 }
2683 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2684 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2685 if (annotation_default != NULL) {
2686 classfile_parse_error(
2687 "Multiple AnnotationDefault attributes for method in class file %s",
2688 CHECK_NULL);
2689 }
2690 annotation_default_length = method_attribute_length;
2691 annotation_default = cfs->get_u1_buffer();
2692 assert(annotation_default != NULL, "null annotation default");
2693 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2694 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2695 if (runtime_visible_type_annotations != NULL) {
2696 classfile_parse_error(
2697 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2698 CHECK_NULL);
2699 }
2700 runtime_visible_type_annotations_length = method_attribute_length;
2701 runtime_visible_type_annotations = cfs->get_u1_buffer();
2702 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2703 // No need for the VM to parse Type annotations
2704 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2705 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2706 if (runtime_invisible_type_annotations_exists) {
2707 classfile_parse_error(
2708 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2709 CHECK_NULL);
2710 } else {
2711 runtime_invisible_type_annotations_exists = true;
2712 }
2713 if (PreserveAllAnnotations) {
2714 runtime_invisible_type_annotations_length = method_attribute_length;
2715 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2716 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2717 }
2718 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2719 } else {
2720 // Skip unknown attributes
2721 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2722 }
2723 } else {
2724 // Skip unknown attributes
2725 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2726 }
2727 }
2728
2729 if (linenumber_table != NULL) {
2730 linenumber_table->write_terminator();
2731 linenumber_table_length = linenumber_table->position();
2732 }
2733
2734 // Make sure there's at least one Code attribute in non-native/non-abstract method
2735 if (_need_verify) {
2736 guarantee_property(access_flags.is_native() ||
2737 access_flags.is_abstract() ||
2738 parsed_code_attribute,
2739 "Absent Code attribute in method that is not native or abstract in class file %s",
2740 CHECK_NULL);
2741 }
2742
2743 // All sizing information for a Method* is finally available, now create it
2744 InlineTableSizes sizes(
2745 total_lvt_length,
2746 linenumber_table_length,
2747 exception_table_length,
2748 checked_exceptions_length,
2749 method_parameters_length,
2750 generic_signature_index,
2751 runtime_visible_annotations_length +
2752 runtime_invisible_annotations_length,
2753 runtime_visible_parameter_annotations_length +
2754 runtime_invisible_parameter_annotations_length,
2755 runtime_visible_type_annotations_length +
2756 runtime_invisible_type_annotations_length,
2757 annotation_default_length,
2758 0);
2759
2760 Method* const m = Method::allocate(_loader_data,
2761 code_length,
2762 access_flags,
2763 &sizes,
2764 ConstMethod::NORMAL,
2765 CHECK_NULL);
2766
2767 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2768
2769 // Fill in information from fixed part (access_flags already set)
2770 m->set_constants(_cp);
2771 m->set_name_index(name_index);
2772 m->set_signature_index(signature_index);
2773
2774 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2775 m->constMethod()->set_result_type(rtf.type());
2776
2777 if (args_size >= 0) {
2778 m->set_size_of_parameters(args_size);
2779 } else {
2780 m->compute_size_of_parameters(THREAD);
2781 }
2782 #ifdef ASSERT
2783 if (args_size >= 0) {
2784 m->compute_size_of_parameters(THREAD);
2785 assert(args_size == m->size_of_parameters(), "");
2786 }
2787 #endif
2788
2789 // Fill in code attribute information
2790 m->set_max_stack(max_stack);
2791 m->set_max_locals(max_locals);
2792 if (stackmap_data != NULL) {
2793 m->constMethod()->copy_stackmap_data(_loader_data,
2794 (u1*)stackmap_data,
2795 stackmap_data_length,
2796 CHECK_NULL);
2797 }
2798
2799 // Copy byte codes
2800 m->set_code((u1*)code_start);
2801
2802 // Copy line number table
2803 if (linenumber_table != NULL) {
2804 memcpy(m->compressed_linenumber_table(),
2805 linenumber_table->buffer(),
2806 linenumber_table_length);
2807 }
2808
2809 // Copy exception table
2810 if (exception_table_length > 0) {
2811 int size =
2812 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2813 copy_u2_with_conversion((u2*) m->exception_table_start(),
2814 exception_table_start, size);
2815 }
2816
2817 // Copy method parameters
2818 if (method_parameters_length > 0) {
2819 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2820 for (int i = 0; i < method_parameters_length; i++) {
2821 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2822 method_parameters_data += 2;
2823 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2824 method_parameters_data += 2;
2825 }
2826 }
2827
2828 // Copy checked exceptions
2829 if (checked_exceptions_length > 0) {
2830 const int size =
2831 checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2832 copy_u2_with_conversion((u2*) m->checked_exceptions_start(),
2833 checked_exceptions_start,
2834 size);
2835 }
2836
2837 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2838 if (total_lvt_length > 0) {
2839 promoted_flags->set_has_localvariable_table();
2840 copy_localvariable_table(m->constMethod(),
2841 lvt_cnt,
2842 localvariable_table_length,
2843 localvariable_table_start,
2844 lvtt_cnt,
2845 localvariable_type_table_length,
2846 localvariable_type_table_start,
2847 CHECK_NULL);
2848 }
2849
2850 if (parsed_annotations.has_any_annotations())
2851 parsed_annotations.apply_to(m);
2852
2853 // Copy annotations
2854 copy_method_annotations(m->constMethod(),
2855 runtime_visible_annotations,
2856 runtime_visible_annotations_length,
2857 runtime_invisible_annotations,
2858 runtime_invisible_annotations_length,
2859 runtime_visible_parameter_annotations,
2860 runtime_visible_parameter_annotations_length,
2861 runtime_invisible_parameter_annotations,
2862 runtime_invisible_parameter_annotations_length,
2863 runtime_visible_type_annotations,
2864 runtime_visible_type_annotations_length,
2865 runtime_invisible_type_annotations,
2866 runtime_invisible_type_annotations_length,
2867 annotation_default,
2868 annotation_default_length,
2869 CHECK_NULL);
2870
2871 if (name == vmSymbols::finalize_method_name() &&
2872 signature == vmSymbols::void_method_signature()) {
2873 if (m->is_empty_method()) {
2874 _has_empty_finalizer = true;
2875 } else {
2876 _has_finalizer = true;
2877 }
2878 }
2879 if (name == vmSymbols::object_initializer_name() &&
2880 signature == vmSymbols::void_method_signature() &&
2881 m->is_vanilla_constructor()) {
2882 _has_vanilla_constructor = true;
2883 }
2884
2885 NOT_PRODUCT(m->verify());
2886 return m;
2887 }
2888
2889
2890 // The promoted_flags parameter is used to pass relevant access_flags
2891 // from the methods back up to the containing klass. These flag values
2892 // are added to klass's access_flags.
2893 // Side-effects: populates the _methods field in the parser
2894 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2895 bool is_interface,
2896 AccessFlags* promoted_flags,
2897 bool* has_final_method,
2898 bool* declares_nonstatic_concrete_methods,
2899 TRAPS) {
2900 assert(cfs != NULL, "invariant");
2901 assert(promoted_flags != NULL, "invariant");
2902 assert(has_final_method != NULL, "invariant");
2903 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2904
2905 assert(NULL == _methods, "invariant");
2906
2907 cfs->guarantee_more(2, CHECK); // length
2908 const u2 length = cfs->get_u2_fast();
2909 if (length == 0) {
2910 _methods = Universe::the_empty_method_array();
2911 } else {
2912 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2913 length,
2914 NULL,
2915 CHECK);
2916
2917 for (int index = 0; index < length; index++) {
2918 Method* method = parse_method(cfs,
2919 is_interface,
2920 _cp,
2921 promoted_flags,
2922 CHECK);
2923
2924 if (method->is_final()) {
2925 *has_final_method = true;
2926 }
2927 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2928 // used for interface initialization, and default method inheritance analysis
2929 if (is_interface && !(*declares_nonstatic_concrete_methods)
2930 && !method->is_abstract() && !method->is_static()) {
2931 *declares_nonstatic_concrete_methods = true;
2932 }
2933 _methods->at_put(index, method);
2934 }
2935
2936 if (_need_verify && length > 1) {
2937 // Check duplicated methods
2938 ResourceMark rm(THREAD);
2939 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2940 THREAD, NameSigHash*, HASH_ROW_SIZE);
2941 initialize_hashtable(names_and_sigs);
2942 bool dup = false;
2943 const Symbol* name = NULL;
2944 const Symbol* sig = NULL;
2945 {
2946 debug_only(NoSafepointVerifier nsv;)
2947 for (int i = 0; i < length; i++) {
2948 const Method* const m = _methods->at(i);
2949 name = m->name();
2950 sig = m->signature();
2951 // If no duplicates, add name/signature in hashtable names_and_sigs.
2952 if (!put_after_lookup(name, sig, names_and_sigs)) {
2953 dup = true;
2954 break;
2955 }
2956 }
2957 }
2958 if (dup) {
2959 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2960 name->as_C_string(), sig->as_klass_external_name(), CHECK);
2961 }
2962 }
2963 }
2964 }
2965
2966 static const intArray* sort_methods(Array<Method*>* methods) {
2967 const int length = methods->length();
2968 // If JVMTI original method ordering or sharing is enabled we have to
2969 // remember the original class file ordering.
2970 // We temporarily use the vtable_index field in the Method* to store the
2971 // class file index, so we can read in after calling qsort.
2972 // Put the method ordering in the shared archive.
2973 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2974 for (int index = 0; index < length; index++) {
2975 Method* const m = methods->at(index);
2976 assert(!m->valid_vtable_index(), "vtable index should not be set");
2977 m->set_vtable_index(index);
2978 }
2979 }
2980 // Sort method array by ascending method name (for faster lookups & vtable construction)
2981 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2982 Method::sort_methods(methods);
2983
2984 intArray* method_ordering = NULL;
2985 // If JVMTI original method ordering or sharing is enabled construct int
2986 // array remembering the original ordering
2987 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2988 method_ordering = new intArray(length, length, -1);
2989 for (int index = 0; index < length; index++) {
2990 Method* const m = methods->at(index);
2991 const int old_index = m->vtable_index();
2992 assert(old_index >= 0 && old_index < length, "invalid method index");
2993 method_ordering->at_put(index, old_index);
2994 m->set_vtable_index(Method::invalid_vtable_index);
2995 }
2996 }
2997 return method_ordering;
2998 }
2999
3000 // Parse generic_signature attribute for methods and fields
3001 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3002 TRAPS) {
3003 assert(cfs != NULL, "invariant");
3004
3005 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3006 const u2 generic_signature_index = cfs->get_u2_fast();
3007 check_property(
3008 valid_symbol_at(generic_signature_index),
3009 "Invalid Signature attribute at constant pool index %u in class file %s",
3010 generic_signature_index, CHECK_0);
3011 return generic_signature_index;
3012 }
3013
3014 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3015 TRAPS) {
3016
3017 assert(cfs != NULL, "invariant");
3018
3019 cfs->guarantee_more(2, CHECK); // sourcefile_index
3020 const u2 sourcefile_index = cfs->get_u2_fast();
3021 check_property(
3022 valid_symbol_at(sourcefile_index),
3023 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3024 sourcefile_index, CHECK);
3025 set_class_sourcefile_index(sourcefile_index);
3026 }
3027
3028 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3029 int length,
3030 TRAPS) {
3031 assert(cfs != NULL, "invariant");
3032
3033 const u1* const sde_buffer = cfs->get_u1_buffer();
3034 assert(sde_buffer != NULL, "null sde buffer");
3035
3036 // Don't bother storing it if there is no way to retrieve it
3037 if (JvmtiExport::can_get_source_debug_extension()) {
3038 assert((length+1) > length, "Overflow checking");
3039 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3040 for (int i = 0; i < length; i++) {
3041 sde[i] = sde_buffer[i];
3042 }
3043 sde[length] = '\0';
3044 set_class_sde_buffer((const char*)sde, length);
3045 }
3046 // Got utf8 string, set stream position forward
3047 cfs->skip_u1(length, CHECK);
3048 }
3049
3050
3051 // Inner classes can be static, private or protected (classic VM does this)
3052 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3053 JVM_ACC_PRIVATE | \
3054 JVM_ACC_PROTECTED | \
3055 JVM_ACC_STATIC \
3056 )
3057
3058 // Return number of classes in the inner classes attribute table
3059 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3060 const u1* const inner_classes_attribute_start,
3061 bool parsed_enclosingmethod_attribute,
3062 u2 enclosing_method_class_index,
3063 u2 enclosing_method_method_index,
3064 TRAPS) {
3065 const u1* const current_mark = cfs->current();
3066 u2 length = 0;
3067 if (inner_classes_attribute_start != NULL) {
3068 cfs->set_current(inner_classes_attribute_start);
3069 cfs->guarantee_more(2, CHECK_0); // length
3070 length = cfs->get_u2_fast();
3071 }
3072
3073 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3074 // method data:
3075 // [inner_class_info_index,
3076 // outer_class_info_index,
3077 // inner_name_index,
3078 // inner_class_access_flags,
3079 // ...
3080 // enclosing_method_class_index,
3081 // enclosing_method_method_index]
3082 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3083 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3084 _inner_classes = inner_classes;
3085
3086 int index = 0;
3087 const int cp_size = _cp->length();
3088 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3089 for (int n = 0; n < length; n++) {
3090 // Inner class index
3091 const u2 inner_class_info_index = cfs->get_u2_fast();
3092 check_property(
3093 valid_klass_reference_at(inner_class_info_index),
3094 "inner_class_info_index %u has bad constant type in class file %s",
3095 inner_class_info_index, CHECK_0);
3096 // Outer class index
3097 const u2 outer_class_info_index = cfs->get_u2_fast();
3098 check_property(
3099 outer_class_info_index == 0 ||
3100 valid_klass_reference_at(outer_class_info_index),
3101 "outer_class_info_index %u has bad constant type in class file %s",
3102 outer_class_info_index, CHECK_0);
3103 // Inner class name
3104 const u2 inner_name_index = cfs->get_u2_fast();
3105 check_property(
3106 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3107 "inner_name_index %u has bad constant type in class file %s",
3108 inner_name_index, CHECK_0);
3109 if (_need_verify) {
3110 guarantee_property(inner_class_info_index != outer_class_info_index,
3111 "Class is both outer and inner class in class file %s", CHECK_0);
3112 }
3113 // Access flags
3114 jint flags;
3115 // JVM_ACC_MODULE is defined in JDK-9 and later.
3116 if (_major_version >= JAVA_9_VERSION) {
3117 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3118 } else {
3119 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3120 }
3121 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3122 // Set abstract bit for old class files for backward compatibility
3123 flags |= JVM_ACC_ABSTRACT;
3124 }
3125 verify_legal_class_modifiers(flags, CHECK_0);
3126 AccessFlags inner_access_flags(flags);
3127
3128 inner_classes->at_put(index++, inner_class_info_index);
3129 inner_classes->at_put(index++, outer_class_info_index);
3130 inner_classes->at_put(index++, inner_name_index);
3131 inner_classes->at_put(index++, inner_access_flags.as_short());
3132 }
3133
3134 // 4347400: make sure there's no duplicate entry in the classes array
3135 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3136 for(int i = 0; i < length * 4; i += 4) {
3137 for(int j = i + 4; j < length * 4; j += 4) {
3138 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3139 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3140 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3141 inner_classes->at(i+3) != inner_classes->at(j+3)),
3142 "Duplicate entry in InnerClasses in class file %s",
3143 CHECK_0);
3144 }
3145 }
3146 }
3147
3148 // Set EnclosingMethod class and method indexes.
3149 if (parsed_enclosingmethod_attribute) {
3150 inner_classes->at_put(index++, enclosing_method_class_index);
3151 inner_classes->at_put(index++, enclosing_method_method_index);
3152 }
3153 assert(index == size, "wrong size");
3154
3155 // Restore buffer's current position.
3156 cfs->set_current(current_mark);
3157
3158 return length;
3159 }
3160
3161 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3162 set_class_synthetic_flag(true);
3163 }
3164
3165 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3166 assert(cfs != NULL, "invariant");
3167
3168 const u2 signature_index = cfs->get_u2(CHECK);
3169 check_property(
3170 valid_symbol_at(signature_index),
3171 "Invalid constant pool index %u in Signature attribute in class file %s",
3172 signature_index, CHECK);
3173 set_class_generic_signature_index(signature_index);
3174 }
3175
3176 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3177 ConstantPool* cp,
3178 u4 attribute_byte_length,
3179 TRAPS) {
3180 assert(cfs != NULL, "invariant");
3181 assert(cp != NULL, "invariant");
3182
3183 const u1* const current_start = cfs->current();
3184
3185 guarantee_property(attribute_byte_length >= sizeof(u2),
3186 "Invalid BootstrapMethods attribute length %u in class file %s",
3187 attribute_byte_length,
3188 CHECK);
3189
3190 cfs->guarantee_more(attribute_byte_length, CHECK);
3191
3192 const int attribute_array_length = cfs->get_u2_fast();
3193
3194 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3195 "Short length on BootstrapMethods in class file %s",
3196 CHECK);
3197
3198
3199 // The attribute contains a counted array of counted tuples of shorts,
3200 // represending bootstrap specifiers:
3201 // length*{bootstrap_method_index, argument_count*{argument_index}}
3202 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3203 // operand_count = number of shorts in attr, except for leading length
3204
3205 // The attribute is copied into a short[] array.
3206 // The array begins with a series of short[2] pairs, one for each tuple.
3207 const int index_size = (attribute_array_length * 2);
3208
3209 Array<u2>* const operands =
3210 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3211
3212 // Eagerly assign operands so they will be deallocated with the constant
3213 // pool if there is an error.
3214 cp->set_operands(operands);
3215
3216 int operand_fill_index = index_size;
3217 const int cp_size = cp->length();
3218
3219 for (int n = 0; n < attribute_array_length; n++) {
3220 // Store a 32-bit offset into the header of the operand array.
3221 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3222
3223 // Read a bootstrap specifier.
3224 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3225 const u2 bootstrap_method_index = cfs->get_u2_fast();
3226 const u2 argument_count = cfs->get_u2_fast();
3227 check_property(
3228 valid_cp_range(bootstrap_method_index, cp_size) &&
3229 cp->tag_at(bootstrap_method_index).is_method_handle(),
3230 "bootstrap_method_index %u has bad constant type in class file %s",
3231 bootstrap_method_index,
3232 CHECK);
3233
3234 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3235 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3236 CHECK);
3237
3238 operands->at_put(operand_fill_index++, bootstrap_method_index);
3239 operands->at_put(operand_fill_index++, argument_count);
3240
3241 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3242 for (int j = 0; j < argument_count; j++) {
3243 const u2 argument_index = cfs->get_u2_fast();
3244 check_property(
3245 valid_cp_range(argument_index, cp_size) &&
3246 cp->tag_at(argument_index).is_loadable_constant(),
3247 "argument_index %u has bad constant type in class file %s",
3248 argument_index,
3249 CHECK);
3250 operands->at_put(operand_fill_index++, argument_index);
3251 }
3252 }
3253 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3254 "Bad length on BootstrapMethods in class file %s",
3255 CHECK);
3256 }
3257
3258 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3259 ConstantPool* cp,
3260 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3261 TRAPS) {
3262 assert(cfs != NULL, "invariant");
3263 assert(cp != NULL, "invariant");
3264 assert(parsed_annotations != NULL, "invariant");
3265
3266 // Set inner classes attribute to default sentinel
3267 _inner_classes = Universe::the_empty_short_array();
3268 cfs->guarantee_more(2, CHECK); // attributes_count
3269 u2 attributes_count = cfs->get_u2_fast();
3270 bool parsed_sourcefile_attribute = false;
3271 bool parsed_innerclasses_attribute = false;
3272 bool parsed_enclosingmethod_attribute = false;
3273 bool parsed_bootstrap_methods_attribute = false;
3274 const u1* runtime_visible_annotations = NULL;
3275 int runtime_visible_annotations_length = 0;
3276 const u1* runtime_invisible_annotations = NULL;
3277 int runtime_invisible_annotations_length = 0;
3278 const u1* runtime_visible_type_annotations = NULL;
3279 int runtime_visible_type_annotations_length = 0;
3280 const u1* runtime_invisible_type_annotations = NULL;
3281 int runtime_invisible_type_annotations_length = 0;
3282 bool runtime_invisible_type_annotations_exists = false;
3283 bool runtime_invisible_annotations_exists = false;
3284 bool parsed_source_debug_ext_annotations_exist = false;
3285 const u1* inner_classes_attribute_start = NULL;
3286 u4 inner_classes_attribute_length = 0;
3287 u2 enclosing_method_class_index = 0;
3288 u2 enclosing_method_method_index = 0;
3289 // Iterate over attributes
3290 while (attributes_count--) {
3291 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3292 const u2 attribute_name_index = cfs->get_u2_fast();
3293 const u4 attribute_length = cfs->get_u4_fast();
3294 check_property(
3295 valid_symbol_at(attribute_name_index),
3296 "Attribute name has bad constant pool index %u in class file %s",
3297 attribute_name_index, CHECK);
3298 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3299 if (tag == vmSymbols::tag_source_file()) {
3300 // Check for SourceFile tag
3301 if (_need_verify) {
3302 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3303 }
3304 if (parsed_sourcefile_attribute) {
3305 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3306 } else {
3307 parsed_sourcefile_attribute = true;
3308 }
3309 parse_classfile_sourcefile_attribute(cfs, CHECK);
3310 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3311 // Check for SourceDebugExtension tag
3312 if (parsed_source_debug_ext_annotations_exist) {
3313 classfile_parse_error(
3314 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3315 }
3316 parsed_source_debug_ext_annotations_exist = true;
3317 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3318 } else if (tag == vmSymbols::tag_inner_classes()) {
3319 // Check for InnerClasses tag
3320 if (parsed_innerclasses_attribute) {
3321 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3322 } else {
3323 parsed_innerclasses_attribute = true;
3324 }
3325 inner_classes_attribute_start = cfs->get_u1_buffer();
3326 inner_classes_attribute_length = attribute_length;
3327 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3328 } else if (tag == vmSymbols::tag_synthetic()) {
3329 // Check for Synthetic tag
3330 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3331 if (attribute_length != 0) {
3332 classfile_parse_error(
3333 "Invalid Synthetic classfile attribute length %u in class file %s",
3334 attribute_length, CHECK);
3335 }
3336 parse_classfile_synthetic_attribute(CHECK);
3337 } else if (tag == vmSymbols::tag_deprecated()) {
3338 // Check for Deprecatd tag - 4276120
3339 if (attribute_length != 0) {
3340 classfile_parse_error(
3341 "Invalid Deprecated classfile attribute length %u in class file %s",
3342 attribute_length, CHECK);
3343 }
3344 } else if (_major_version >= JAVA_1_5_VERSION) {
3345 if (tag == vmSymbols::tag_signature()) {
3346 if (_generic_signature_index != 0) {
3347 classfile_parse_error(
3348 "Multiple Signature attributes in class file %s", CHECK);
3349 }
3350 if (attribute_length != 2) {
3351 classfile_parse_error(
3352 "Wrong Signature attribute length %u in class file %s",
3353 attribute_length, CHECK);
3354 }
3355 parse_classfile_signature_attribute(cfs, CHECK);
3356 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3357 if (runtime_visible_annotations != NULL) {
3358 classfile_parse_error(
3359 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3360 }
3361 runtime_visible_annotations_length = attribute_length;
3362 runtime_visible_annotations = cfs->get_u1_buffer();
3363 assert(runtime_visible_annotations != NULL, "null visible annotations");
3364 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3365 parse_annotations(cp,
3366 runtime_visible_annotations,
3367 runtime_visible_annotations_length,
3368 parsed_annotations,
3369 _loader_data,
3370 CHECK);
3371 cfs->skip_u1_fast(runtime_visible_annotations_length);
3372 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3373 if (runtime_invisible_annotations_exists) {
3374 classfile_parse_error(
3375 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3376 }
3377 runtime_invisible_annotations_exists = true;
3378 if (PreserveAllAnnotations) {
3379 runtime_invisible_annotations_length = attribute_length;
3380 runtime_invisible_annotations = cfs->get_u1_buffer();
3381 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3382 }
3383 cfs->skip_u1(attribute_length, CHECK);
3384 } else if (tag == vmSymbols::tag_enclosing_method()) {
3385 if (parsed_enclosingmethod_attribute) {
3386 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3387 } else {
3388 parsed_enclosingmethod_attribute = true;
3389 }
3390 guarantee_property(attribute_length == 4,
3391 "Wrong EnclosingMethod attribute length %u in class file %s",
3392 attribute_length, CHECK);
3393 cfs->guarantee_more(4, CHECK); // class_index, method_index
3394 enclosing_method_class_index = cfs->get_u2_fast();
3395 enclosing_method_method_index = cfs->get_u2_fast();
3396 if (enclosing_method_class_index == 0) {
3397 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3398 }
3399 // Validate the constant pool indices and types
3400 check_property(valid_klass_reference_at(enclosing_method_class_index),
3401 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3402 if (enclosing_method_method_index != 0 &&
3403 (!cp->is_within_bounds(enclosing_method_method_index) ||
3404 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3405 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3406 }
3407 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3408 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3409 if (parsed_bootstrap_methods_attribute) {
3410 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3411 }
3412 parsed_bootstrap_methods_attribute = true;
3413 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3414 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3415 if (runtime_visible_type_annotations != NULL) {
3416 classfile_parse_error(
3417 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3418 }
3419 runtime_visible_type_annotations_length = attribute_length;
3420 runtime_visible_type_annotations = cfs->get_u1_buffer();
3421 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3422 // No need for the VM to parse Type annotations
3423 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3424 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3425 if (runtime_invisible_type_annotations_exists) {
3426 classfile_parse_error(
3427 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3428 } else {
3429 runtime_invisible_type_annotations_exists = true;
3430 }
3431 if (PreserveAllAnnotations) {
3432 runtime_invisible_type_annotations_length = attribute_length;
3433 runtime_invisible_type_annotations = cfs->get_u1_buffer();
3434 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3435 }
3436 cfs->skip_u1(attribute_length, CHECK);
3437 } else {
3438 // Unknown attribute
3439 cfs->skip_u1(attribute_length, CHECK);
3440 }
3441 } else {
3442 // Unknown attribute
3443 cfs->skip_u1(attribute_length, CHECK);
3444 }
3445 }
3446 _annotations = assemble_annotations(runtime_visible_annotations,
3447 runtime_visible_annotations_length,
3448 runtime_invisible_annotations,
3449 runtime_invisible_annotations_length,
3450 CHECK);
3451 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3452 runtime_visible_type_annotations_length,
3453 runtime_invisible_type_annotations,
3454 runtime_invisible_type_annotations_length,
3455 CHECK);
3456
3457 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3458 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3459 cfs,
3460 inner_classes_attribute_start,
3461 parsed_innerclasses_attribute,
3462 enclosing_method_class_index,
3463 enclosing_method_method_index,
3464 CHECK);
3465 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3466 guarantee_property(
3467 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3468 "Wrong InnerClasses attribute length in class file %s", CHECK);
3469 }
3470 }
3471
3472 if (_max_bootstrap_specifier_index >= 0) {
3473 guarantee_property(parsed_bootstrap_methods_attribute,
3474 "Missing BootstrapMethods attribute in class file %s", CHECK);
3475 }
3476 }
3477
3478 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3479 assert(k != NULL, "invariant");
3480
3481 if (_synthetic_flag)
3482 k->set_is_synthetic();
3483 if (_sourcefile_index != 0) {
3484 k->set_source_file_name_index(_sourcefile_index);
3485 }
3486 if (_generic_signature_index != 0) {
3487 k->set_generic_signature_index(_generic_signature_index);
3488 }
3489 if (_sde_buffer != NULL) {
3490 k->set_source_debug_extension(_sde_buffer, _sde_length);
3491 }
3492 }
3493
3494 // Create the Annotations object that will
3495 // hold the annotations array for the Klass.
3496 void ClassFileParser::create_combined_annotations(TRAPS) {
3497 if (_annotations == NULL &&
3498 _type_annotations == NULL &&
3499 _fields_annotations == NULL &&
3500 _fields_type_annotations == NULL) {
3501 // Don't create the Annotations object unnecessarily.
3502 return;
3503 }
3504
3505 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3506 annotations->set_class_annotations(_annotations);
3507 annotations->set_class_type_annotations(_type_annotations);
3508 annotations->set_fields_annotations(_fields_annotations);
3509 annotations->set_fields_type_annotations(_fields_type_annotations);
3510
3511 // This is the Annotations object that will be
3512 // assigned to InstanceKlass being constructed.
3513 _combined_annotations = annotations;
3514
3515 // The annotations arrays below has been transfered the
3516 // _combined_annotations so these fields can now be cleared.
3517 _annotations = NULL;
3518 _type_annotations = NULL;
3519 _fields_annotations = NULL;
3520 _fields_type_annotations = NULL;
3521 }
3522
3523 // Transfer ownership of metadata allocated to the InstanceKlass.
3524 void ClassFileParser::apply_parsed_class_metadata(
3525 InstanceKlass* this_klass,
3526 int java_fields_count, TRAPS) {
3527 assert(this_klass != NULL, "invariant");
3528
3529 _cp->set_pool_holder(this_klass);
3530 this_klass->set_constants(_cp);
3531 this_klass->set_fields(_fields, java_fields_count);
3532 this_klass->set_methods(_methods);
3533 this_klass->set_inner_classes(_inner_classes);
3534 this_klass->set_local_interfaces(_local_interfaces);
3535 this_klass->set_transitive_interfaces(_transitive_interfaces);
3536 this_klass->set_annotations(_combined_annotations);
3537
3538 // Clear out these fields so they don't get deallocated by the destructor
3539 clear_class_metadata();
3540 }
3541
3542 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3543 int runtime_visible_annotations_length,
3544 const u1* const runtime_invisible_annotations,
3545 int runtime_invisible_annotations_length,
3546 TRAPS) {
3547 AnnotationArray* annotations = NULL;
3548 if (runtime_visible_annotations != NULL ||
3549 runtime_invisible_annotations != NULL) {
3550 annotations = MetadataFactory::new_array<u1>(_loader_data,
3551 runtime_visible_annotations_length +
3552 runtime_invisible_annotations_length,
3553 CHECK_(annotations));
3554 if (runtime_visible_annotations != NULL) {
3555 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3556 annotations->at_put(i, runtime_visible_annotations[i]);
3557 }
3558 }
3559 if (runtime_invisible_annotations != NULL) {
3560 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3561 int append = runtime_visible_annotations_length+i;
3562 annotations->at_put(append, runtime_invisible_annotations[i]);
3563 }
3564 }
3565 }
3566 return annotations;
3567 }
3568
3569 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3570 const int super_class_index,
3571 const bool need_verify,
3572 TRAPS) {
3573 assert(cp != NULL, "invariant");
3574 const InstanceKlass* super_klass = NULL;
3575
3576 if (super_class_index == 0) {
3577 check_property(_class_name == vmSymbols::java_lang_Object(),
3578 "Invalid superclass index %u in class file %s",
3579 super_class_index,
3580 CHECK_NULL);
3581 } else {
3582 check_property(valid_klass_reference_at(super_class_index),
3583 "Invalid superclass index %u in class file %s",
3584 super_class_index,
3585 CHECK_NULL);
3586 // The class name should be legal because it is checked when parsing constant pool.
3587 // However, make sure it is not an array type.
3588 bool is_array = false;
3589 if (cp->tag_at(super_class_index).is_klass()) {
3590 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3591 if (need_verify)
3592 is_array = super_klass->is_array_klass();
3593 } else if (need_verify) {
3594 is_array = (cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3595 }
3596 if (need_verify) {
3597 guarantee_property(!is_array,
3598 "Bad superclass name in class file %s", CHECK_NULL);
3599 }
3600 }
3601 return super_klass;
3602 }
3603
3604 static unsigned int compute_oop_map_count(const InstanceKlass* super,
3605 unsigned int nonstatic_oop_map_count,
3606 int first_nonstatic_oop_offset) {
3607
3608 unsigned int map_count =
3609 NULL == super ? 0 : super->nonstatic_oop_map_count();
3610 if (nonstatic_oop_map_count > 0) {
3611 // We have oops to add to map
3612 if (map_count == 0) {
3613 map_count = nonstatic_oop_map_count;
3614 }
3615 else {
3616 // Check whether we should add a new map block or whether the last one can
3617 // be extended
3618 const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3619 const OopMapBlock* const last_map = first_map + map_count - 1;
3620
3621 const int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3622 if (next_offset == first_nonstatic_oop_offset) {
3623 // There is no gap bettwen superklass's last oop field and first
3624 // local oop field, merge maps.
3625 nonstatic_oop_map_count -= 1;
3626 }
3627 else {
3628 // Superklass didn't end with a oop field, add extra maps
3629 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3630 }
3631 map_count += nonstatic_oop_map_count;
3632 }
3633 }
3634 return map_count;
3635 }
3636
3637 #ifndef PRODUCT
3638 static void print_field_layout(const Symbol* name,
3639 Array<u2>* fields,
3640 constantPoolHandle cp,
3641 int instance_size,
3642 int instance_fields_start,
3643 int instance_fields_end,
3644 int static_fields_end) {
3645
3646 assert(name != NULL, "invariant");
3647
3648 tty->print("%s: field layout\n", name->as_klass_external_name());
3649 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3650 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3651 if (!fs.access_flags().is_static()) {
3652 tty->print(" @%3d \"%s\" %s\n",
3653 fs.offset(),
3654 fs.name()->as_klass_external_name(),
3655 fs.signature()->as_klass_external_name());
3656 }
3657 }
3658 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3659 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3660 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3661 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3662 if (fs.access_flags().is_static()) {
3663 tty->print(" @%3d \"%s\" %s\n",
3664 fs.offset(),
3665 fs.name()->as_klass_external_name(),
3666 fs.signature()->as_klass_external_name());
3667 }
3668 }
3669 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3670 tty->print("\n");
3671 }
3672 #endif
3673
3674 // Values needed for oopmap and InstanceKlass creation
3675 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3676 public:
3677 int* nonstatic_oop_offsets;
3678 unsigned int* nonstatic_oop_counts;
3679 unsigned int nonstatic_oop_map_count;
3680 unsigned int total_oop_map_count;
3681 int instance_size;
3682 int nonstatic_field_size;
3683 int static_field_size;
3684 bool has_nonstatic_fields;
3685 };
3686
3687 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3688 void ClassFileParser::layout_fields(ConstantPool* cp,
3689 const FieldAllocationCount* fac,
3690 const ClassAnnotationCollector* parsed_annotations,
3691 FieldLayoutInfo* info,
3692 TRAPS) {
3693
3694 assert(cp != NULL, "invariant");
3695
3696 // Field size and offset computation
3697 int nonstatic_field_size = _super_klass == NULL ? 0 :
3698 _super_klass->nonstatic_field_size();
3699
3700 // Count the contended fields by type.
3701 //
3702 // We ignore static fields, because @Contended is not supported for them.
3703 // The layout code below will also ignore the static fields.
3704 int nonstatic_contended_count = 0;
3705 FieldAllocationCount fac_contended;
3706 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3707 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3708 if (fs.is_contended()) {
3709 fac_contended.count[atype]++;
3710 if (!fs.access_flags().is_static()) {
3711 nonstatic_contended_count++;
3712 }
3713 }
3714 }
3715
3716
3717 // Calculate the starting byte offsets
3718 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3719 int next_static_double_offset = next_static_oop_offset +
3720 ((fac->count[STATIC_OOP]) * heapOopSize);
3721 if ( fac->count[STATIC_DOUBLE] &&
3722 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3723 Universe::field_type_should_be_aligned(T_LONG)) ) {
3724 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3725 }
3726
3727 int next_static_word_offset = next_static_double_offset +
3728 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3729 int next_static_short_offset = next_static_word_offset +
3730 ((fac->count[STATIC_WORD]) * BytesPerInt);
3731 int next_static_byte_offset = next_static_short_offset +
3732 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3733
3734 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3735 nonstatic_field_size * heapOopSize;
3736
3737 int next_nonstatic_field_offset = nonstatic_fields_start;
3738
3739 const bool is_contended_class = parsed_annotations->is_contended();
3740
3741 // Class is contended, pad before all the fields
3742 if (is_contended_class) {
3743 next_nonstatic_field_offset += ContendedPaddingWidth;
3744 }
3745
3746 // Compute the non-contended fields count.
3747 // The packing code below relies on these counts to determine if some field
3748 // can be squeezed into the alignment gap. Contended fields are obviously
3749 // exempt from that.
3750 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3751 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3752 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3753 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3754 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3755
3756 // Total non-static fields count, including every contended field
3757 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3758 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3759 fac->count[NONSTATIC_OOP];
3760
3761 const bool super_has_nonstatic_fields =
3762 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
3763 const bool has_nonstatic_fields =
3764 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3765
3766
3767 // Prepare list of oops for oop map generation.
3768 //
3769 // "offset" and "count" lists are describing the set of contiguous oop
3770 // regions. offset[i] is the start of the i-th region, which then has
3771 // count[i] oops following. Before we know how many regions are required,
3772 // we pessimistically allocate the maps to fit all the oops into the
3773 // distinct regions.
3774 //
3775 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3776 // to figure out if we still need to do this.
3777 unsigned int nonstatic_oop_map_count = 0;
3778 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3779
3780 int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3781 THREAD, int, max_nonstatic_oop_maps);
3782 unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3783 THREAD, unsigned int, max_nonstatic_oop_maps);
3784
3785 int first_nonstatic_oop_offset = 0; // will be set for first oop field
3786
3787 bool compact_fields = CompactFields;
3788 int allocation_style = FieldsAllocationStyle;
3789 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3790 assert(false, "0 <= FieldsAllocationStyle <= 2");
3791 allocation_style = 1; // Optimistic
3792 }
3793
3794 // The next classes have predefined hard-coded fields offsets
3795 // (see in JavaClasses::compute_hard_coded_offsets()).
3796 // Use default fields allocation order for them.
3797 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
3798 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3799 _class_name == vmSymbols::java_lang_Class() ||
3800 _class_name == vmSymbols::java_lang_ClassLoader() ||
3801 _class_name == vmSymbols::java_lang_ref_Reference() ||
3802 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3803 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3804 _class_name == vmSymbols::java_lang_String() ||
3805 _class_name == vmSymbols::java_lang_Throwable() ||
3806 _class_name == vmSymbols::java_lang_Boolean() ||
3807 _class_name == vmSymbols::java_lang_Character() ||
3808 _class_name == vmSymbols::java_lang_Float() ||
3809 _class_name == vmSymbols::java_lang_Double() ||
3810 _class_name == vmSymbols::java_lang_Byte() ||
3811 _class_name == vmSymbols::java_lang_Short() ||
3812 _class_name == vmSymbols::java_lang_Integer() ||
3813 _class_name == vmSymbols::java_lang_Long())) {
3814 allocation_style = 0; // Allocate oops first
3815 compact_fields = false; // Don't compact fields
3816 }
3817
3818 int next_nonstatic_oop_offset = 0;
3819 int next_nonstatic_double_offset = 0;
3820
3821 // Rearrange fields for a given allocation style
3822 if( allocation_style == 0 ) {
3823 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3824 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3825 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3826 (nonstatic_oop_count * heapOopSize);
3827 } else if( allocation_style == 1 ) {
3828 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3829 next_nonstatic_double_offset = next_nonstatic_field_offset;
3830 } else if( allocation_style == 2 ) {
3831 // Fields allocation: oops fields in super and sub classes are together.
3832 if( nonstatic_field_size > 0 && _super_klass != NULL &&
3833 _super_klass->nonstatic_oop_map_size() > 0 ) {
3834 const unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3835 const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps();
3836 const OopMapBlock* const last_map = first_map + map_count - 1;
3837 const int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3838 if (next_offset == next_nonstatic_field_offset) {
3839 allocation_style = 0; // allocate oops first
3840 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3841 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3842 (nonstatic_oop_count * heapOopSize);
3843 }
3844 }
3845 if( allocation_style == 2 ) {
3846 allocation_style = 1; // allocate oops last
3847 next_nonstatic_double_offset = next_nonstatic_field_offset;
3848 }
3849 } else {
3850 ShouldNotReachHere();
3851 }
3852
3853 int nonstatic_oop_space_count = 0;
3854 int nonstatic_word_space_count = 0;
3855 int nonstatic_short_space_count = 0;
3856 int nonstatic_byte_space_count = 0;
3857 int nonstatic_oop_space_offset = 0;
3858 int nonstatic_word_space_offset = 0;
3859 int nonstatic_short_space_offset = 0;
3860 int nonstatic_byte_space_offset = 0;
3861
3862 // Try to squeeze some of the fields into the gaps due to
3863 // long/double alignment.
3864 if (nonstatic_double_count > 0) {
3865 int offset = next_nonstatic_double_offset;
3866 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3867 if (compact_fields && offset != next_nonstatic_double_offset) {
3868 // Allocate available fields into the gap before double field.
3869 int length = next_nonstatic_double_offset - offset;
3870 assert(length == BytesPerInt, "");
3871 nonstatic_word_space_offset = offset;
3872 if (nonstatic_word_count > 0) {
3873 nonstatic_word_count -= 1;
3874 nonstatic_word_space_count = 1; // Only one will fit
3875 length -= BytesPerInt;
3876 offset += BytesPerInt;
3877 }
3878 nonstatic_short_space_offset = offset;
3879 while (length >= BytesPerShort && nonstatic_short_count > 0) {
3880 nonstatic_short_count -= 1;
3881 nonstatic_short_space_count += 1;
3882 length -= BytesPerShort;
3883 offset += BytesPerShort;
3884 }
3885 nonstatic_byte_space_offset = offset;
3886 while (length > 0 && nonstatic_byte_count > 0) {
3887 nonstatic_byte_count -= 1;
3888 nonstatic_byte_space_count += 1;
3889 length -= 1;
3890 }
3891 // Allocate oop field in the gap if there are no other fields for that.
3892 nonstatic_oop_space_offset = offset;
3893 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
3894 allocation_style != 0) { // when oop fields not first
3895 nonstatic_oop_count -= 1;
3896 nonstatic_oop_space_count = 1; // Only one will fit
3897 length -= heapOopSize;
3898 offset += heapOopSize;
3899 }
3900 }
3901 }
3902
3903 int next_nonstatic_word_offset = next_nonstatic_double_offset +
3904 (nonstatic_double_count * BytesPerLong);
3905 int next_nonstatic_short_offset = next_nonstatic_word_offset +
3906 (nonstatic_word_count * BytesPerInt);
3907 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
3908 (nonstatic_short_count * BytesPerShort);
3909 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3910 nonstatic_byte_count;
3911
3912 // let oops jump before padding with this allocation style
3913 if( allocation_style == 1 ) {
3914 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3915 if( nonstatic_oop_count > 0 ) {
3916 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3917 }
3918 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3919 }
3920
3921 // Iterate over fields again and compute correct offsets.
3922 // The field allocation type was temporarily stored in the offset slot.
3923 // oop fields are located before non-oop fields (static and non-static).
3924 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3925
3926 // skip already laid out fields
3927 if (fs.is_offset_set()) continue;
3928
3929 // contended instance fields are handled below
3930 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3931
3932 int real_offset = 0;
3933 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
3934
3935 // pack the rest of the fields
3936 switch (atype) {
3937 case STATIC_OOP:
3938 real_offset = next_static_oop_offset;
3939 next_static_oop_offset += heapOopSize;
3940 break;
3941 case STATIC_BYTE:
3942 real_offset = next_static_byte_offset;
3943 next_static_byte_offset += 1;
3944 break;
3945 case STATIC_SHORT:
3946 real_offset = next_static_short_offset;
3947 next_static_short_offset += BytesPerShort;
3948 break;
3949 case STATIC_WORD:
3950 real_offset = next_static_word_offset;
3951 next_static_word_offset += BytesPerInt;
3952 break;
3953 case STATIC_DOUBLE:
3954 real_offset = next_static_double_offset;
3955 next_static_double_offset += BytesPerLong;
3956 break;
3957 case NONSTATIC_OOP:
3958 if( nonstatic_oop_space_count > 0 ) {
3959 real_offset = nonstatic_oop_space_offset;
3960 nonstatic_oop_space_offset += heapOopSize;
3961 nonstatic_oop_space_count -= 1;
3962 } else {
3963 real_offset = next_nonstatic_oop_offset;
3964 next_nonstatic_oop_offset += heapOopSize;
3965 }
3966
3967 // Record this oop in the oop maps
3968 if( nonstatic_oop_map_count > 0 &&
3969 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3970 real_offset -
3971 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3972 heapOopSize ) {
3973 // This oop is adjacent to the previous one, add to current oop map
3974 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3975 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3976 } else {
3977 // This oop is not adjacent to the previous one, create new oop map
3978 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3979 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3980 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3981 nonstatic_oop_map_count += 1;
3982 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3983 first_nonstatic_oop_offset = real_offset;
3984 }
3985 }
3986 break;
3987 case NONSTATIC_BYTE:
3988 if( nonstatic_byte_space_count > 0 ) {
3989 real_offset = nonstatic_byte_space_offset;
3990 nonstatic_byte_space_offset += 1;
3991 nonstatic_byte_space_count -= 1;
3992 } else {
3993 real_offset = next_nonstatic_byte_offset;
3994 next_nonstatic_byte_offset += 1;
3995 }
3996 break;
3997 case NONSTATIC_SHORT:
3998 if( nonstatic_short_space_count > 0 ) {
3999 real_offset = nonstatic_short_space_offset;
4000 nonstatic_short_space_offset += BytesPerShort;
4001 nonstatic_short_space_count -= 1;
4002 } else {
4003 real_offset = next_nonstatic_short_offset;
4004 next_nonstatic_short_offset += BytesPerShort;
4005 }
4006 break;
4007 case NONSTATIC_WORD:
4008 if( nonstatic_word_space_count > 0 ) {
4009 real_offset = nonstatic_word_space_offset;
4010 nonstatic_word_space_offset += BytesPerInt;
4011 nonstatic_word_space_count -= 1;
4012 } else {
4013 real_offset = next_nonstatic_word_offset;
4014 next_nonstatic_word_offset += BytesPerInt;
4015 }
4016 break;
4017 case NONSTATIC_DOUBLE:
4018 real_offset = next_nonstatic_double_offset;
4019 next_nonstatic_double_offset += BytesPerLong;
4020 break;
4021 default:
4022 ShouldNotReachHere();
4023 }
4024 fs.set_offset(real_offset);
4025 }
4026
4027
4028 // Handle the contended cases.
4029 //
4030 // Each contended field should not intersect the cache line with another contended field.
4031 // In the absence of alignment information, we end up with pessimistically separating
4032 // the fields with full-width padding.
4033 //
4034 // Additionally, this should not break alignment for the fields, so we round the alignment up
4035 // for each field.
4036 if (nonstatic_contended_count > 0) {
4037
4038 // if there is at least one contended field, we need to have pre-padding for them
4039 next_nonstatic_padded_offset += ContendedPaddingWidth;
4040
4041 // collect all contended groups
4042 ResourceBitMap bm(cp->size());
4043 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4044 // skip already laid out fields
4045 if (fs.is_offset_set()) continue;
4046
4047 if (fs.is_contended()) {
4048 bm.set_bit(fs.contended_group());
4049 }
4050 }
4051
4052 int current_group = -1;
4053 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4054
4055 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4056
4057 // skip already laid out fields
4058 if (fs.is_offset_set()) continue;
4059
4060 // skip non-contended fields and fields from different group
4061 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4062
4063 // handle statics below
4064 if (fs.access_flags().is_static()) continue;
4065
4066 int real_offset = 0;
4067 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4068
4069 switch (atype) {
4070 case NONSTATIC_BYTE:
4071 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
4072 real_offset = next_nonstatic_padded_offset;
4073 next_nonstatic_padded_offset += 1;
4074 break;
4075
4076 case NONSTATIC_SHORT:
4077 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
4078 real_offset = next_nonstatic_padded_offset;
4079 next_nonstatic_padded_offset += BytesPerShort;
4080 break;
4081
4082 case NONSTATIC_WORD:
4083 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
4084 real_offset = next_nonstatic_padded_offset;
4085 next_nonstatic_padded_offset += BytesPerInt;
4086 break;
4087
4088 case NONSTATIC_DOUBLE:
4089 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
4090 real_offset = next_nonstatic_padded_offset;
4091 next_nonstatic_padded_offset += BytesPerLong;
4092 break;
4093
4094 case NONSTATIC_OOP:
4095 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
4096 real_offset = next_nonstatic_padded_offset;
4097 next_nonstatic_padded_offset += heapOopSize;
4098
4099 // Record this oop in the oop maps
4100 if( nonstatic_oop_map_count > 0 &&
4101 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4102 real_offset -
4103 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4104 heapOopSize ) {
4105 // This oop is adjacent to the previous one, add to current oop map
4106 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4107 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4108 } else {
4109 // This oop is not adjacent to the previous one, create new oop map
4110 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4111 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4112 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4113 nonstatic_oop_map_count += 1;
4114 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4115 first_nonstatic_oop_offset = real_offset;
4116 }
4117 }
4118 break;
4119
4120 default:
4121 ShouldNotReachHere();
4122 }
4123
4124 if (fs.contended_group() == 0) {
4125 // Contended group defines the equivalence class over the fields:
4126 // the fields within the same contended group are not inter-padded.
4127 // The only exception is default group, which does not incur the
4128 // equivalence, and so requires intra-padding.
4129 next_nonstatic_padded_offset += ContendedPaddingWidth;
4130 }
4131
4132 fs.set_offset(real_offset);
4133 } // for
4134
4135 // Start laying out the next group.
4136 // Note that this will effectively pad the last group in the back;
4137 // this is expected to alleviate memory contention effects for
4138 // subclass fields and/or adjacent object.
4139 // If this was the default group, the padding is already in place.
4140 if (current_group != 0) {
4141 next_nonstatic_padded_offset += ContendedPaddingWidth;
4142 }
4143 }
4144
4145 // handle static fields
4146 }
4147
4148 // Entire class is contended, pad in the back.
4149 // This helps to alleviate memory contention effects for subclass fields
4150 // and/or adjacent object.
4151 if (is_contended_class) {
4152 next_nonstatic_padded_offset += ContendedPaddingWidth;
4153 }
4154
4155 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4156
4157 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
4158 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize);
4159 int static_fields_end = align_size_up(next_static_byte_offset, wordSize);
4160
4161 int static_field_size = (static_fields_end -
4162 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4163 nonstatic_field_size = nonstatic_field_size +
4164 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4165
4166 int instance_size = align_object_size(instance_end / wordSize);
4167
4168 assert(instance_size == align_object_size(align_size_up(
4169 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
4170 wordSize) / wordSize), "consistent layout helper value");
4171
4172 // Invariant: nonstatic_field end/start should only change if there are
4173 // nonstatic fields in the class, or if the class is contended. We compare
4174 // against the non-aligned value, so that end alignment will not fail the
4175 // assert without actually having the fields.
4176 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4177 is_contended_class ||
4178 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4179
4180 // Number of non-static oop map blocks allocated at end of klass.
4181 const unsigned int total_oop_map_count =
4182 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
4183 first_nonstatic_oop_offset);
4184
4185 #ifndef PRODUCT
4186 if (PrintFieldLayout) {
4187 print_field_layout(_class_name,
4188 _fields,
4189 cp,
4190 instance_size,
4191 nonstatic_fields_start,
4192 nonstatic_fields_end,
4193 static_fields_end);
4194 }
4195
4196 #endif
4197 // Pass back information needed for InstanceKlass creation
4198 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
4199 info->nonstatic_oop_counts = nonstatic_oop_counts;
4200 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
4201 info->total_oop_map_count = total_oop_map_count;
4202 info->instance_size = instance_size;
4203 info->static_field_size = static_field_size;
4204 info->nonstatic_field_size = nonstatic_field_size;
4205 info->has_nonstatic_fields = has_nonstatic_fields;
4206 }
4207
4208 static void fill_oop_maps(const InstanceKlass* k,
4209 unsigned int nonstatic_oop_map_count,
4210 const int* nonstatic_oop_offsets,
4211 const unsigned int* nonstatic_oop_counts) {
4212
4213 assert(k != NULL, "invariant");
4214
4215 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4216 const InstanceKlass* const super = k->superklass();
4217 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4218 if (super_count > 0) {
4219 // Copy maps from superklass
4220 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4221 for (unsigned int i = 0; i < super_count; ++i) {
4222 *this_oop_map++ = *super_oop_map++;
4223 }
4224 }
4225
4226 if (nonstatic_oop_map_count > 0) {
4227 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4228 // The counts differ because there is no gap between superklass's last oop
4229 // field and the first local oop field. Extend the last oop map copied
4230 // from the superklass instead of creating new one.
4231 nonstatic_oop_map_count--;
4232 nonstatic_oop_offsets++;
4233 this_oop_map--;
4234 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4235 this_oop_map++;
4236 }
4237
4238 // Add new map blocks, fill them
4239 while (nonstatic_oop_map_count-- > 0) {
4240 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4241 this_oop_map->set_count(*nonstatic_oop_counts++);
4242 this_oop_map++;
4243 }
4244 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4245 this_oop_map, "sanity");
4246 }
4247 }
4248
4249
4250 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4251 assert(ik != NULL, "invariant");
4252
4253 const Klass* const super = ik->super();
4254
4255 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4256 // in which case we don't have to register objects as finalizable
4257 if (!_has_empty_finalizer) {
4258 if (_has_finalizer ||
4259 (super != NULL && super->has_finalizer())) {
4260 ik->set_has_finalizer();
4261 }
4262 }
4263
4264 #ifdef ASSERT
4265 bool f = false;
4266 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4267 vmSymbols::void_method_signature());
4268 if (m != NULL && !m->is_empty_method()) {
4269 f = true;
4270 }
4271
4272 // Spec doesn't prevent agent from redefinition of empty finalizer.
4273 // Despite the fact that it's generally bad idea and redefined finalizer
4274 // will not work as expected we shouldn't abort vm in this case
4275 if (!ik->has_redefined_this_or_super()) {
4276 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4277 }
4278 #endif
4279
4280 // Check if this klass supports the java.lang.Cloneable interface
4281 if (SystemDictionary::Cloneable_klass_loaded()) {
4282 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4283 ik->set_is_cloneable();
4284 }
4285 }
4286
4287 // Check if this klass has a vanilla default constructor
4288 if (super == NULL) {
4289 // java.lang.Object has empty default constructor
4290 ik->set_has_vanilla_constructor();
4291 } else {
4292 if (super->has_vanilla_constructor() &&
4293 _has_vanilla_constructor) {
4294 ik->set_has_vanilla_constructor();
4295 }
4296 #ifdef ASSERT
4297 bool v = false;
4298 if (super->has_vanilla_constructor()) {
4299 const Method* const constructor =
4300 ik->find_method(vmSymbols::object_initializer_name(),
4301 vmSymbols::void_method_signature());
4302 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4303 v = true;
4304 }
4305 }
4306 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4307 #endif
4308 }
4309
4310 // If it cannot be fast-path allocated, set a bit in the layout helper.
4311 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4312 assert(ik->size_helper() > 0, "layout_helper is initialized");
4313 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4314 || ik->is_abstract() || ik->is_interface()
4315 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4316 || ik->size_helper() >= FastAllocateSizeLimit) {
4317 // Forbid fast-path allocation.
4318 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4319 ik->set_layout_helper(lh);
4320 }
4321 }
4322
4323 // Attach super classes and interface classes to class loader data
4324 static void record_defined_class_dependencies(const InstanceKlass* defined_klass,
4325 TRAPS) {
4326 assert(defined_klass != NULL, "invariant");
4327
4328 ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data();
4329 if (defining_loader_data->is_the_null_class_loader_data()) {
4330 // Dependencies to null class loader data are implicit.
4331 return;
4332 } else {
4333 // add super class dependency
4334 Klass* const super = defined_klass->super();
4335 if (super != NULL) {
4336 defining_loader_data->record_dependency(super, CHECK);
4337 }
4338
4339 // add super interface dependencies
4340 const Array<Klass*>* const local_interfaces = defined_klass->local_interfaces();
4341 if (local_interfaces != NULL) {
4342 const int length = local_interfaces->length();
4343 for (int i = 0; i < length; i++) {
4344 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4345 }
4346 }
4347 }
4348 }
4349
4350 // utility methods for appending an array with check for duplicates
4351
4352 static void append_interfaces(GrowableArray<Klass*>* result,
4353 const Array<Klass*>* const ifs) {
4354 // iterate over new interfaces
4355 for (int i = 0; i < ifs->length(); i++) {
4356 Klass* const e = ifs->at(i);
4357 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4358 // add new interface
4359 result->append_if_missing(e);
4360 }
4361 }
4362
4363 static Array<Klass*>* compute_transitive_interfaces(const InstanceKlass* super,
4364 Array<Klass*>* local_ifs,
4365 ClassLoaderData* loader_data,
4366 TRAPS) {
4367 assert(local_ifs != NULL, "invariant");
4368 assert(loader_data != NULL, "invariant");
4369
4370 // Compute maximum size for transitive interfaces
4371 int max_transitive_size = 0;
4372 int super_size = 0;
4373 // Add superclass transitive interfaces size
4374 if (super != NULL) {
4375 super_size = super->transitive_interfaces()->length();
4376 max_transitive_size += super_size;
4377 }
4378 // Add local interfaces' super interfaces
4379 const int local_size = local_ifs->length();
4380 for (int i = 0; i < local_size; i++) {
4381 Klass* const l = local_ifs->at(i);
4382 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4383 }
4384 // Finally add local interfaces
4385 max_transitive_size += local_size;
4386 // Construct array
4387 if (max_transitive_size == 0) {
4388 // no interfaces, use canonicalized array
4389 return Universe::the_empty_klass_array();
4390 } else if (max_transitive_size == super_size) {
4391 // no new local interfaces added, share superklass' transitive interface array
4392 return super->transitive_interfaces();
4393 } else if (max_transitive_size == local_size) {
4394 // only local interfaces added, share local interface array
4395 return local_ifs;
4396 } else {
4397 ResourceMark rm;
4398 GrowableArray<Klass*>* const result = new GrowableArray<Klass*>(max_transitive_size);
4399
4400 // Copy down from superclass
4401 if (super != NULL) {
4402 append_interfaces(result, super->transitive_interfaces());
4403 }
4404
4405 // Copy down from local interfaces' superinterfaces
4406 for (int i = 0; i < local_size; i++) {
4407 Klass* const l = local_ifs->at(i);
4408 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4409 }
4410 // Finally add local interfaces
4411 append_interfaces(result, local_ifs);
4412
4413 // length will be less than the max_transitive_size if duplicates were removed
4414 const int length = result->length();
4415 assert(length <= max_transitive_size, "just checking");
4416 Array<Klass*>* const new_result =
4417 MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL);
4418 for (int i = 0; i < length; i++) {
4419 Klass* const e = result->at(i);
4420 assert(e != NULL, "just checking");
4421 new_result->at_put(i, e);
4422 }
4423 return new_result;
4424 }
4425 }
4426
4427 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4428 assert(this_klass != NULL, "invariant");
4429 const Klass* const super = this_klass->super();
4430 if (super != NULL) {
4431
4432 // If the loader is not the boot loader then throw an exception if its
4433 // superclass is in package jdk.internal.reflect and its loader is not a
4434 // special reflection class loader
4435 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4436 assert(super->is_instance_klass(), "super is not instance klass");
4437 PackageEntry* super_package = super->package();
4438 if (super_package != NULL &&
4439 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4440 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4441 ResourceMark rm(THREAD);
4442 Exceptions::fthrow(
4443 THREAD_AND_LOCATION,
4444 vmSymbols::java_lang_IllegalAccessError(),
4445 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4446 this_klass->external_name(),
4447 this_klass->class_loader_data()->loader_name(),
4448 super->external_name());
4449 return;
4450 }
4451 }
4452
4453 Reflection::VerifyClassAccessResults vca_result =
4454 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4455 if (vca_result != Reflection::ACCESS_OK) {
4456 ResourceMark rm(THREAD);
4457 char* msg = Reflection::verify_class_access_msg(this_klass,
4458 InstanceKlass::cast(super),
4459 vca_result);
4460 if (msg == NULL) {
4461 Exceptions::fthrow(
4462 THREAD_AND_LOCATION,
4463 vmSymbols::java_lang_IllegalAccessError(),
4464 "class %s cannot access its superclass %s",
4465 this_klass->external_name(),
4466 super->external_name());
4467 } else {
4468 // Add additional message content.
4469 Exceptions::fthrow(
4470 THREAD_AND_LOCATION,
4471 vmSymbols::java_lang_IllegalAccessError(),
4472 "superclass access check failed: %s",
4473 msg);
4474 }
4475 }
4476 }
4477 }
4478
4479
4480 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4481 assert(this_klass != NULL, "invariant");
4482 const Array<Klass*>* const local_interfaces = this_klass->local_interfaces();
4483 const int lng = local_interfaces->length();
4484 for (int i = lng - 1; i >= 0; i--) {
4485 Klass* const k = local_interfaces->at(i);
4486 assert (k != NULL && k->is_interface(), "invalid interface");
4487 Reflection::VerifyClassAccessResults vca_result =
4488 Reflection::verify_class_access(this_klass, InstanceKlass::cast(k), false);
4489 if (vca_result != Reflection::ACCESS_OK) {
4490 ResourceMark rm(THREAD);
4491 char* msg = Reflection::verify_class_access_msg(this_klass,
4492 InstanceKlass::cast(k),
4493 vca_result);
4494 if (msg == NULL) {
4495 Exceptions::fthrow(
4496 THREAD_AND_LOCATION,
4497 vmSymbols::java_lang_IllegalAccessError(),
4498 "class %s cannot access its superinterface %s",
4499 this_klass->external_name(),
4500 k->external_name());
4501 } else {
4502 // Add additional message content.
4503 Exceptions::fthrow(
4504 THREAD_AND_LOCATION,
4505 vmSymbols::java_lang_IllegalAccessError(),
4506 "superinterface check failed: %s",
4507 msg);
4508 }
4509 }
4510 }
4511 }
4512
4513
4514 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4515 assert(this_klass != NULL, "invariant");
4516 const Array<Method*>* const methods = this_klass->methods();
4517 const int num_methods = methods->length();
4518
4519 // go thru each method and check if it overrides a final method
4520 for (int index = 0; index < num_methods; index++) {
4521 const Method* const m = methods->at(index);
4522
4523 // skip private, static, and <init> methods
4524 if ((!m->is_private() && !m->is_static()) &&
4525 (m->name() != vmSymbols::object_initializer_name())) {
4526
4527 const Symbol* const name = m->name();
4528 const Symbol* const signature = m->signature();
4529 const Klass* k = this_klass->super();
4530 const Method* super_m = NULL;
4531 while (k != NULL) {
4532 // skip supers that don't have final methods.
4533 if (k->has_final_method()) {
4534 // lookup a matching method in the super class hierarchy
4535 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4536 if (super_m == NULL) {
4537 break; // didn't find any match; get out
4538 }
4539
4540 if (super_m->is_final() && !super_m->is_static() &&
4541 // matching method in super is final, and not static
4542 (Reflection::verify_field_access(this_klass,
4543 super_m->method_holder(),
4544 super_m->method_holder(),
4545 super_m->access_flags(), false))
4546 // this class can access super final method and therefore override
4547 ) {
4548 ResourceMark rm(THREAD);
4549 Exceptions::fthrow(
4550 THREAD_AND_LOCATION,
4551 vmSymbols::java_lang_VerifyError(),
4552 "class %s overrides final method %s.%s%s",
4553 this_klass->external_name(),
4554 super_m->method_holder()->external_name(),
4555 name->as_C_string(),
4556 signature->as_C_string()
4557 );
4558 return;
4559 }
4560
4561 // continue to look from super_m's holder's super.
4562 k = super_m->method_holder()->super();
4563 continue;
4564 }
4565
4566 k = k->super();
4567 }
4568 }
4569 }
4570 }
4571
4572
4573 // assumes that this_klass is an interface
4574 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4575 assert(this_klass != NULL, "invariant");
4576 assert(this_klass->is_interface(), "not an interface");
4577 const Array<Method*>* methods = this_klass->methods();
4578 const int num_methods = methods->length();
4579
4580 for (int index = 0; index < num_methods; index++) {
4581 const Method* const m = methods->at(index);
4582 // if m is static and not the init method, throw a verify error
4583 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4584 ResourceMark rm(THREAD);
4585 Exceptions::fthrow(
4586 THREAD_AND_LOCATION,
4587 vmSymbols::java_lang_VerifyError(),
4588 "Illegal static method %s in interface %s",
4589 m->name()->as_C_string(),
4590 this_klass->external_name()
4591 );
4592 return;
4593 }
4594 }
4595 }
4596
4597 // utility methods for format checking
4598
4599 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4600 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4601 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4602 if (is_module) {
4603 ResourceMark rm(THREAD);
4604 Exceptions::fthrow(
4605 THREAD_AND_LOCATION,
4606 vmSymbols::java_lang_NoClassDefFoundError(),
4607 "%s is not a class because access_flag ACC_MODULE is set",
4608 _class_name->as_C_string());
4609 return;
4610 }
4611
4612 if (!_need_verify) { return; }
4613
4614 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4615 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4616 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4617 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4618 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4619 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4620 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4621
4622 if ((is_abstract && is_final) ||
4623 (is_interface && !is_abstract) ||
4624 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4625 (!is_interface && major_gte_15 && is_annotation)) {
4626 ResourceMark rm(THREAD);
4627 Exceptions::fthrow(
4628 THREAD_AND_LOCATION,
4629 vmSymbols::java_lang_ClassFormatError(),
4630 "Illegal class modifiers in class %s: 0x%X",
4631 _class_name->as_C_string(), flags
4632 );
4633 return;
4634 }
4635 }
4636
4637 static bool has_illegal_visibility(jint flags) {
4638 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4639 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4640 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4641
4642 return ((is_public && is_protected) ||
4643 (is_public && is_private) ||
4644 (is_protected && is_private));
4645 }
4646
4647 static bool is_supported_version(u2 major, u2 minor){
4648 const u2 max_version = JAVA_MAX_SUPPORTED_VERSION;
4649 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4650 (major <= max_version) &&
4651 ((major != max_version) ||
4652 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4653 }
4654
4655 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4656 bool is_interface,
4657 TRAPS) const {
4658 if (!_need_verify) { return; }
4659
4660 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4661 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4662 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4663 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4664 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4665 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4666 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4667 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4668 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4669
4670 bool is_illegal = false;
4671
4672 if (is_interface) {
4673 if (!is_public || !is_static || !is_final || is_private ||
4674 is_protected || is_volatile || is_transient ||
4675 (major_gte_15 && is_enum)) {
4676 is_illegal = true;
4677 }
4678 } else { // not interface
4679 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4680 is_illegal = true;
4681 }
4682 }
4683
4684 if (is_illegal) {
4685 ResourceMark rm(THREAD);
4686 Exceptions::fthrow(
4687 THREAD_AND_LOCATION,
4688 vmSymbols::java_lang_ClassFormatError(),
4689 "Illegal field modifiers in class %s: 0x%X",
4690 _class_name->as_C_string(), flags);
4691 return;
4692 }
4693 }
4694
4695 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4696 bool is_interface,
4697 const Symbol* name,
4698 TRAPS) const {
4699 if (!_need_verify) { return; }
4700
4701 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4702 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4703 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4704 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4705 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4706 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4707 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4708 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4709 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4710 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4711 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4712 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4713 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4714
4715 bool is_illegal = false;
4716
4717 if (is_interface) {
4718 if (major_gte_8) {
4719 // Class file version is JAVA_8_VERSION or later Methods of
4720 // interfaces may set any of the flags except ACC_PROTECTED,
4721 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4722 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4723 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4724 (is_native || is_protected || is_final || is_synchronized) ||
4725 // If a specific method of a class or interface has its
4726 // ACC_ABSTRACT flag set, it must not have any of its
4727 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4728 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4729 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4730 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4731 (is_abstract && (is_private || is_static || is_strict))) {
4732 is_illegal = true;
4733 }
4734 } else if (major_gte_15) {
4735 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4736 if (!is_public || is_private || is_protected || is_static || is_final ||
4737 is_synchronized || is_native || !is_abstract || is_strict) {
4738 is_illegal = true;
4739 }
4740 } else {
4741 // Class file version is pre-JAVA_1_5_VERSION
4742 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4743 is_illegal = true;
4744 }
4745 }
4746 } else { // not interface
4747 if (has_illegal_visibility(flags)) {
4748 is_illegal = true;
4749 } else {
4750 if (is_initializer) {
4751 if (is_static || is_final || is_synchronized || is_native ||
4752 is_abstract || (major_gte_15 && is_bridge)) {
4753 is_illegal = true;
4754 }
4755 } else { // not initializer
4756 if (is_abstract) {
4757 if ((is_final || is_native || is_private || is_static ||
4758 (major_gte_15 && (is_synchronized || is_strict)))) {
4759 is_illegal = true;
4760 }
4761 }
4762 }
4763 }
4764 }
4765
4766 if (is_illegal) {
4767 ResourceMark rm(THREAD);
4768 Exceptions::fthrow(
4769 THREAD_AND_LOCATION,
4770 vmSymbols::java_lang_ClassFormatError(),
4771 "Method %s in class %s has illegal modifiers: 0x%X",
4772 name->as_C_string(), _class_name->as_C_string(), flags);
4773 return;
4774 }
4775 }
4776
4777 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4778 int length,
4779 TRAPS) const {
4780 assert(_need_verify, "only called when _need_verify is true");
4781 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
4782 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4783 }
4784 }
4785
4786 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4787 // In class names, '/' separates unqualified names. This is verified in this function also.
4788 // Method names also may not contain the characters '<' or '>', unless <init>
4789 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4790 // method. Because these names have been checked as special cases before
4791 // calling this method in verify_legal_method_name.
4792 //
4793 // This method is also called from the modular system APIs in modules.cpp
4794 // to verify the validity of module and package names.
4795 bool ClassFileParser::verify_unqualified_name(const char* name,
4796 unsigned int length,
4797 int type) {
4798 for (const char* p = name; p != name + length;) {
4799 jchar ch = *p;
4800 if (ch < 128) {
4801 if (ch == '.' || ch == ';' || ch == '[' ) {
4802 return false; // do not permit '.', ';', or '['
4803 }
4804 if (ch == '/') {
4805 // check for '//' or leading or trailing '/' which are not legal
4806 // unqualified name must not be empty
4807 if (type == ClassFileParser::LegalClass) {
4808 if (p == name || p+1 >= name+length || *(p+1) == '/') {
4809 return false;
4810 }
4811 } else {
4812 return false; // do not permit '/' unless it's class name
4813 }
4814 }
4815 if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) {
4816 return false; // do not permit '<' or '>' in method names
4817 }
4818 p++;
4819 } else {
4820 char* tmp_p = UTF8::next(p, &ch);
4821 p = tmp_p;
4822 }
4823 }
4824 return true;
4825 }
4826
4827 // Take pointer to a string. Skip over the longest part of the string that could
4828 // be taken as a fieldname. Allow '/' if slash_ok is true.
4829 // Return a pointer to just past the fieldname.
4830 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4831 // being true, we saw consecutive slashes (meaning we were looking for a
4832 // qualified path but found something that was badly-formed).
4833 static const char* skip_over_field_name(const char* name,
4834 bool slash_ok,
4835 unsigned int length) {
4836 const char* p;
4837 jboolean last_is_slash = false;
4838 jboolean not_first_ch = false;
4839
4840 for (p = name; p != name + length; not_first_ch = true) {
4841 const char* old_p = p;
4842 jchar ch = *p;
4843 if (ch < 128) {
4844 p++;
4845 // quick check for ascii
4846 if ((ch >= 'a' && ch <= 'z') ||
4847 (ch >= 'A' && ch <= 'Z') ||
4848 (ch == '_' || ch == '$') ||
4849 (not_first_ch && ch >= '0' && ch <= '9')) {
4850 last_is_slash = false;
4851 continue;
4852 }
4853 if (slash_ok && ch == '/') {
4854 if (last_is_slash) {
4855 return NULL; // Don't permit consecutive slashes
4856 }
4857 last_is_slash = true;
4858 continue;
4859 }
4860 }
4861 else {
4862 jint unicode_ch;
4863 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4864 p = tmp_p;
4865 last_is_slash = false;
4866 // Check if ch is Java identifier start or is Java identifier part
4867 // 4672820: call java.lang.Character methods directly without generating separate tables.
4868 EXCEPTION_MARK;
4869
4870 // return value
4871 JavaValue result(T_BOOLEAN);
4872 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4873 JavaCallArguments args;
4874 args.push_int(unicode_ch);
4875
4876 // public static boolean isJavaIdentifierStart(char ch);
4877 JavaCalls::call_static(&result,
4878 SystemDictionary::Character_klass(),
4879 vmSymbols::isJavaIdentifierStart_name(),
4880 vmSymbols::int_bool_signature(),
4881 &args,
4882 THREAD);
4883
4884 if (HAS_PENDING_EXCEPTION) {
4885 CLEAR_PENDING_EXCEPTION;
4886 return 0;
4887 }
4888 if (result.get_jboolean()) {
4889 continue;
4890 }
4891
4892 if (not_first_ch) {
4893 // public static boolean isJavaIdentifierPart(char ch);
4894 JavaCalls::call_static(&result,
4895 SystemDictionary::Character_klass(),
4896 vmSymbols::isJavaIdentifierPart_name(),
4897 vmSymbols::int_bool_signature(),
4898 &args,
4899 THREAD);
4900
4901 if (HAS_PENDING_EXCEPTION) {
4902 CLEAR_PENDING_EXCEPTION;
4903 return 0;
4904 }
4905
4906 if (result.get_jboolean()) {
4907 continue;
4908 }
4909 }
4910 }
4911 return (not_first_ch) ? old_p : NULL;
4912 }
4913 return (not_first_ch) ? p : NULL;
4914 }
4915
4916 // Take pointer to a string. Skip over the longest part of the string that could
4917 // be taken as a field signature. Allow "void" if void_ok.
4918 // Return a pointer to just past the signature.
4919 // Return NULL if no legal signature is found.
4920 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4921 bool void_ok,
4922 unsigned int length,
4923 TRAPS) const {
4924 unsigned int array_dim = 0;
4925 while (length > 0) {
4926 switch (signature[0]) {
4927 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4928 case JVM_SIGNATURE_BOOLEAN:
4929 case JVM_SIGNATURE_BYTE:
4930 case JVM_SIGNATURE_CHAR:
4931 case JVM_SIGNATURE_SHORT:
4932 case JVM_SIGNATURE_INT:
4933 case JVM_SIGNATURE_FLOAT:
4934 case JVM_SIGNATURE_LONG:
4935 case JVM_SIGNATURE_DOUBLE:
4936 return signature + 1;
4937 case JVM_SIGNATURE_CLASS: {
4938 if (_major_version < JAVA_1_5_VERSION) {
4939 // Skip over the class name if one is there
4940 const char* const p = skip_over_field_name(signature + 1, true, --length);
4941
4942 // The next character better be a semicolon
4943 if (p && (p - signature) > 1 && p[0] == ';') {
4944 return p + 1;
4945 }
4946 }
4947 else {
4948 // Skip leading 'L' and ignore first appearance of ';'
4949 length--;
4950 signature++;
4951 char* c = strchr((char*) signature, ';');
4952 // Format check signature
4953 if (c != NULL) {
4954 ResourceMark rm(THREAD);
4955 int newlen = c - (char*) signature;
4956 char* sig = NEW_RESOURCE_ARRAY(char, newlen + 1);
4957 strncpy(sig, signature, newlen);
4958 sig[newlen] = '\0';
4959
4960 bool legal = verify_unqualified_name(sig, newlen, LegalClass);
4961 if (!legal) {
4962 classfile_parse_error("Class name contains illegal character "
4963 "in descriptor in class file %s",
4964 CHECK_0);
4965 return NULL;
4966 }
4967 return signature + newlen + 1;
4968 }
4969 }
4970 return NULL;
4971 }
4972 case JVM_SIGNATURE_ARRAY:
4973 array_dim++;
4974 if (array_dim > 255) {
4975 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4976 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4977 }
4978 // The rest of what's there better be a legal signature
4979 signature++;
4980 length--;
4981 void_ok = false;
4982 break;
4983 default:
4984 return NULL;
4985 }
4986 }
4987 return NULL;
4988 }
4989
4990 // Checks if name is a legal class name.
4991 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4992 if (!_need_verify || _relax_verify) { return; }
4993
4994 char buf[fixed_buffer_size];
4995 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4996 unsigned int length = name->utf8_length();
4997 bool legal = false;
4998
4999 if (length > 0) {
5000 const char* p;
5001 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5002 p = skip_over_field_signature(bytes, false, length, CHECK);
5003 legal = (p != NULL) && ((p - bytes) == (int)length);
5004 } else if (_major_version < JAVA_1_5_VERSION) {
5005 if (bytes[0] != '<') {
5006 p = skip_over_field_name(bytes, true, length);
5007 legal = (p != NULL) && ((p - bytes) == (int)length);
5008 }
5009 } else {
5010 // 4900761: relax the constraints based on JSR202 spec
5011 // Class names may be drawn from the entire Unicode character set.
5012 // Identifiers between '/' must be unqualified names.
5013 // The utf8 string has been verified when parsing cpool entries.
5014 legal = verify_unqualified_name(bytes, length, LegalClass);
5015 }
5016 }
5017 if (!legal) {
5018 ResourceMark rm(THREAD);
5019 assert(_class_name != NULL, "invariant");
5020 Exceptions::fthrow(
5021 THREAD_AND_LOCATION,
5022 vmSymbols::java_lang_ClassFormatError(),
5023 "Illegal class name \"%s\" in class file %s", bytes,
5024 _class_name->as_C_string()
5025 );
5026 return;
5027 }
5028 }
5029
5030 // Checks if name is a legal field name.
5031 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5032 if (!_need_verify || _relax_verify) { return; }
5033
5034 char buf[fixed_buffer_size];
5035 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5036 unsigned int length = name->utf8_length();
5037 bool legal = false;
5038
5039 if (length > 0) {
5040 if (_major_version < JAVA_1_5_VERSION) {
5041 if (bytes[0] != '<') {
5042 const char* p = skip_over_field_name(bytes, false, length);
5043 legal = (p != NULL) && ((p - bytes) == (int)length);
5044 }
5045 } else {
5046 // 4881221: relax the constraints based on JSR202 spec
5047 legal = verify_unqualified_name(bytes, length, LegalField);
5048 }
5049 }
5050
5051 if (!legal) {
5052 ResourceMark rm(THREAD);
5053 assert(_class_name != NULL, "invariant");
5054 Exceptions::fthrow(
5055 THREAD_AND_LOCATION,
5056 vmSymbols::java_lang_ClassFormatError(),
5057 "Illegal field name \"%s\" in class %s", bytes,
5058 _class_name->as_C_string()
5059 );
5060 return;
5061 }
5062 }
5063
5064 // Checks if name is a legal method name.
5065 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5066 if (!_need_verify || _relax_verify) { return; }
5067
5068 assert(name != NULL, "method name is null");
5069 char buf[fixed_buffer_size];
5070 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5071 unsigned int length = name->utf8_length();
5072 bool legal = false;
5073
5074 if (length > 0) {
5075 if (bytes[0] == '<') {
5076 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5077 legal = true;
5078 }
5079 } else if (_major_version < JAVA_1_5_VERSION) {
5080 const char* p;
5081 p = skip_over_field_name(bytes, false, length);
5082 legal = (p != NULL) && ((p - bytes) == (int)length);
5083 } else {
5084 // 4881221: relax the constraints based on JSR202 spec
5085 legal = verify_unqualified_name(bytes, length, LegalMethod);
5086 }
5087 }
5088
5089 if (!legal) {
5090 ResourceMark rm(THREAD);
5091 assert(_class_name != NULL, "invariant");
5092 Exceptions::fthrow(
5093 THREAD_AND_LOCATION,
5094 vmSymbols::java_lang_ClassFormatError(),
5095 "Illegal method name \"%s\" in class %s", bytes,
5096 _class_name->as_C_string()
5097 );
5098 return;
5099 }
5100 }
5101
5102
5103 // Checks if signature is a legal field signature.
5104 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5105 const Symbol* signature,
5106 TRAPS) const {
5107 if (!_need_verify) { return; }
5108
5109 char buf[fixed_buffer_size];
5110 const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5111 const unsigned int length = signature->utf8_length();
5112 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5113
5114 if (p == NULL || (p - bytes) != (int)length) {
5115 throwIllegalSignature("Field", name, signature, CHECK);
5116 }
5117 }
5118
5119 // Checks if signature is a legal method signature.
5120 // Returns number of parameters
5121 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5122 const Symbol* signature,
5123 TRAPS) const {
5124 if (!_need_verify) {
5125 // make sure caller's args_size will be less than 0 even for non-static
5126 // method so it will be recomputed in compute_size_of_parameters().
5127 return -2;
5128 }
5129
5130 // Class initializers cannot have args for class format version >= 51.
5131 if (name == vmSymbols::class_initializer_name() &&
5132 signature != vmSymbols::void_method_signature() &&
5133 _major_version >= JAVA_7_VERSION) {
5134 throwIllegalSignature("Method", name, signature, CHECK_0);
5135 return 0;
5136 }
5137
5138 unsigned int args_size = 0;
5139 char buf[fixed_buffer_size];
5140 const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5141 unsigned int length = signature->utf8_length();
5142 const char* nextp;
5143
5144 // The first character must be a '('
5145 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5146 length--;
5147 // Skip over legal field signatures
5148 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5149 while ((length > 0) && (nextp != NULL)) {
5150 args_size++;
5151 if (p[0] == 'J' || p[0] == 'D') {
5152 args_size++;
5153 }
5154 length -= nextp - p;
5155 p = nextp;
5156 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5157 }
5158 // The first non-signature thing better be a ')'
5159 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5160 length--;
5161 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5162 // All internal methods must return void
5163 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5164 return args_size;
5165 }
5166 } else {
5167 // Now we better just have a return value
5168 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5169 if (nextp && ((int)length == (nextp - p))) {
5170 return args_size;
5171 }
5172 }
5173 }
5174 }
5175 // Report error
5176 throwIllegalSignature("Method", name, signature, CHECK_0);
5177 return 0;
5178 }
5179
5180 int ClassFileParser::static_field_size() const {
5181 assert(_field_info != NULL, "invariant");
5182 return _field_info->static_field_size;
5183 }
5184
5185 int ClassFileParser::total_oop_map_count() const {
5186 assert(_field_info != NULL, "invariant");
5187 return _field_info->total_oop_map_count;
5188 }
5189
5190 jint ClassFileParser::layout_size() const {
5191 assert(_field_info != NULL, "invariant");
5192 return _field_info->instance_size;
5193 }
5194
5195 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5196 const Array<Method*>* methods) {
5197 assert(ik != NULL, "invariant");
5198 assert(methods != NULL, "invariant");
5199
5200 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5201 // (We used to do this lazily, but now we query it in Rewriter,
5202 // which is eagerly done for every method, so we might as well do it now,
5203 // when everything is fresh in memory.)
5204 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5205
5206 if (klass_id != vmSymbols::NO_SID) {
5207 for (int j = 0; j < methods->length(); ++j) {
5208 Method* method = methods->at(j);
5209 method->init_intrinsic_id();
5210
5211 if (CheckIntrinsics) {
5212 // Check if an intrinsic is defined for method 'method',
5213 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5214 if (method->intrinsic_id() != vmIntrinsics::_none &&
5215 !method->intrinsic_candidate()) {
5216 tty->print("Compiler intrinsic is defined for method [%s], "
5217 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5218 method->name_and_sig_as_C_string(),
5219 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5220 );
5221 tty->cr();
5222 DEBUG_ONLY(vm_exit(1));
5223 }
5224 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5225 // but there is no intrinsic available for it.
5226 if (method->intrinsic_candidate() &&
5227 method->intrinsic_id() == vmIntrinsics::_none) {
5228 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5229 "but no compiler intrinsic is defined for the method.%s",
5230 method->name_and_sig_as_C_string(),
5231 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5232 );
5233 tty->cr();
5234 DEBUG_ONLY(vm_exit(1));
5235 }
5236 }
5237 } // end for
5238
5239 #ifdef ASSERT
5240 if (CheckIntrinsics) {
5241 // Check for orphan methods in the current class. A method m
5242 // of a class C is orphan if an intrinsic is defined for method m,
5243 // but class C does not declare m.
5244 // The check is potentially expensive, therefore it is available
5245 // only in debug builds.
5246
5247 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5248 if (vmIntrinsics::_compiledLambdaForm == id) {
5249 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5250 // generated for the JVM from a LambdaForm and therefore no method
5251 // is defined for it.
5252 continue;
5253 }
5254
5255 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5256 // Check if the current class contains a method with the same
5257 // name, flags, signature.
5258 bool match = false;
5259 for (int j = 0; j < methods->length(); ++j) {
5260 const Method* method = methods->at(j);
5261 if (method->intrinsic_id() == id) {
5262 match = true;
5263 break;
5264 }
5265 }
5266
5267 if (!match) {
5268 char buf[1000];
5269 tty->print("Compiler intrinsic is defined for method [%s], "
5270 "but the method is not available in class [%s].%s",
5271 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5272 buf, sizeof(buf)),
5273 ik->name()->as_C_string(),
5274 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5275 );
5276 tty->cr();
5277 DEBUG_ONLY(vm_exit(1));
5278 }
5279 }
5280 } // end for
5281 } // CheckIntrinsics
5282 #endif // ASSERT
5283 }
5284 }
5285
5286 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5287 if (_klass != NULL) {
5288 return _klass;
5289 }
5290
5291 InstanceKlass* const ik =
5292 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5293
5294 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5295
5296 assert(_klass == ik, "invariant");
5297
5298 ik->set_has_passed_fingerprint_check(false);
5299 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5300 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5301 if (aot_fp != 0 && aot_fp == _stream->compute_fingerprint()) {
5302 // This class matches with a class saved in an AOT library
5303 ik->set_has_passed_fingerprint_check(true);
5304 } else {
5305 ResourceMark rm;
5306 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5307 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5308 }
5309 }
5310
5311 return ik;
5312 }
5313
5314 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5315 assert(ik != NULL, "invariant");
5316
5317 set_klass_to_deallocate(ik);
5318
5319 assert(_field_info != NULL, "invariant");
5320 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5321 assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count,
5322 "sanity");
5323
5324 assert(ik->is_instance_klass(), "sanity");
5325 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5326
5327 // Fill in information already parsed
5328 ik->set_should_verify_class(_need_verify);
5329
5330 // Not yet: supers are done below to support the new subtype-checking fields
5331 ik->set_class_loader_data(_loader_data);
5332 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5333 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5334 assert(_fac != NULL, "invariant");
5335 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5336
5337 // this transfers ownership of a lot of arrays from
5338 // the parser onto the InstanceKlass*
5339 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5340
5341 // note that is not safe to use the fields in the parser from this point on
5342 assert(NULL == _cp, "invariant");
5343 assert(NULL == _fields, "invariant");
5344 assert(NULL == _methods, "invariant");
5345 assert(NULL == _inner_classes, "invariant");
5346 assert(NULL == _local_interfaces, "invariant");
5347 assert(NULL == _transitive_interfaces, "invariant");
5348 assert(NULL == _combined_annotations, "invariant");
5349
5350 if (_has_final_method) {
5351 ik->set_has_final_method();
5352 }
5353
5354 ik->copy_method_ordering(_method_ordering, CHECK);
5355 // The InstanceKlass::_methods_jmethod_ids cache
5356 // is managed on the assumption that the initial cache
5357 // size is equal to the number of methods in the class. If
5358 // that changes, then InstanceKlass::idnum_can_increment()
5359 // has to be changed accordingly.
5360 ik->set_initial_method_idnum(ik->methods()->length());
5361
5362 ik->set_name(_class_name);
5363
5364 if (is_anonymous()) {
5365 // _this_class_index is a CONSTANT_Class entry that refers to this
5366 // anonymous class itself. If this class needs to refer to its own methods or
5367 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5368 // _this_class_index. However, because this class is anonymous (it's
5369 // not stored in SystemDictionary), _this_class_index cannot be resolved
5370 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5371 // Therefore, we must eagerly resolve _this_class_index now.
5372 ik->constants()->klass_at_put(_this_class_index, ik);
5373 }
5374
5375 ik->set_minor_version(_minor_version);
5376 ik->set_major_version(_major_version);
5377 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5378 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5379
5380 if (_host_klass != NULL) {
5381 assert (ik->is_anonymous(), "should be the same");
5382 ik->set_host_klass(_host_klass);
5383 }
5384
5385 // Set PackageEntry for this_klass
5386 oop cl = ik->class_loader();
5387 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5388 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5389 ik->set_package(cld, CHECK);
5390
5391 const Array<Method*>* const methods = ik->methods();
5392 assert(methods != NULL, "invariant");
5393 const int methods_len = methods->length();
5394
5395 check_methods_for_intrinsics(ik, methods);
5396
5397 // Fill in field values obtained by parse_classfile_attributes
5398 if (_parsed_annotations->has_any_annotations()) {
5399 _parsed_annotations->apply_to(ik);
5400 }
5401
5402 apply_parsed_class_attributes(ik);
5403
5404 // Miranda methods
5405 if ((_num_miranda_methods > 0) ||
5406 // if this class introduced new miranda methods or
5407 (_super_klass != NULL && _super_klass->has_miranda_methods())
5408 // super class exists and this class inherited miranda methods
5409 ) {
5410 ik->set_has_miranda_methods(); // then set a flag
5411 }
5412
5413 // Fill in information needed to compute superclasses.
5414 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), CHECK);
5415
5416 // Initialize itable offset tables
5417 klassItable::setup_itable_offset_table(ik);
5418
5419 // Compute transitive closure of interfaces this class implements
5420 // Do final class setup
5421 fill_oop_maps(ik,
5422 _field_info->nonstatic_oop_map_count,
5423 _field_info->nonstatic_oop_offsets,
5424 _field_info->nonstatic_oop_counts);
5425
5426 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5427 set_precomputed_flags(ik);
5428
5429 // check if this class can access its super class
5430 check_super_class_access(ik, CHECK);
5431
5432 // check if this class can access its superinterfaces
5433 check_super_interface_access(ik, CHECK);
5434
5435 // check if this class overrides any final method
5436 check_final_method_override(ik, CHECK);
5437
5438 // reject static interface methods prior to Java 8
5439 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5440 check_illegal_static_method(ik, CHECK);
5441 }
5442
5443 // Obtain this_klass' module entry
5444 ModuleEntry* module_entry = ik->module();
5445 assert(module_entry != NULL, "module_entry should always be set");
5446
5447 // Obtain java.lang.Module
5448 Handle module_handle(THREAD, JNIHandles::resolve(module_entry->module()));
5449
5450 // Allocate mirror and initialize static fields
5451 // The create_mirror() call will also call compute_modifiers()
5452 java_lang_Class::create_mirror(ik,
5453 Handle(THREAD, _loader_data->class_loader()),
5454 module_handle,
5455 _protection_domain,
5456 CHECK);
5457
5458 assert(_all_mirandas != NULL, "invariant");
5459
5460 // Generate any default methods - default methods are public interface methods
5461 // that have a default implementation. This is new with Java 8.
5462 if (_has_nonstatic_concrete_methods) {
5463 DefaultMethods::generate_default_methods(ik,
5464 _all_mirandas,
5465 CHECK);
5466 }
5467
5468 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5469 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5470 !module_entry->has_default_read_edges()) {
5471 if (!module_entry->set_has_default_read_edges()) {
5472 // We won a potential race
5473 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5474 }
5475 }
5476
5477 // Update the loader_data graph.
5478 record_defined_class_dependencies(ik, CHECK);
5479
5480 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5481
5482 if (!is_internal()) {
5483 if (log_is_enabled(Info, class, load)) {
5484 ResourceMark rm;
5485 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5486 ik->print_class_load_logging(_loader_data, module_name, _stream);
5487 }
5488
5489 if (log_is_enabled(Debug, class, resolve)) {
5490 ResourceMark rm;
5491 // print out the superclass.
5492 const char * from = ik->external_name();
5493 if (ik->java_super() != NULL) {
5494 log_debug(class, resolve)("%s %s (super)",
5495 from,
5496 ik->java_super()->external_name());
5497 }
5498 // print out each of the interface classes referred to by this class.
5499 const Array<Klass*>* const local_interfaces = ik->local_interfaces();
5500 if (local_interfaces != NULL) {
5501 const int length = local_interfaces->length();
5502 for (int i = 0; i < length; i++) {
5503 const Klass* const k = local_interfaces->at(i);
5504 const char * to = k->external_name();
5505 log_debug(class, resolve)("%s %s (interface)", from, to);
5506 }
5507 }
5508 }
5509 }
5510
5511 TRACE_INIT_ID(ik);
5512
5513 // If we reach here, all is well.
5514 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5515 // in order for it to not be destroyed in the ClassFileParser destructor.
5516 set_klass_to_deallocate(NULL);
5517
5518 // it's official
5519 set_klass(ik);
5520
5521 debug_only(ik->verify();)
5522 }
5523
5524 // For an anonymous class that is in the unnamed package, move it to its host class's
5525 // package by prepending its host class's package name to its class name and setting
5526 // its _class_name field.
5527 void ClassFileParser::prepend_host_package_name(const InstanceKlass* host_klass, TRAPS) {
5528 ResourceMark rm(THREAD);
5529 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
5530 "Anonymous class should not be in a package");
5531 const char* host_pkg_name =
5532 ClassLoader::package_from_name(host_klass->name()->as_C_string(), NULL);
5533
5534 if (host_pkg_name != NULL) {
5535 size_t host_pkg_len = strlen(host_pkg_name);
5536 int class_name_len = _class_name->utf8_length();
5537 char* new_anon_name =
5538 NEW_RESOURCE_ARRAY(char, host_pkg_len + 1 + class_name_len);
5539 // Copy host package name and trailing /.
5540 strncpy(new_anon_name, host_pkg_name, host_pkg_len);
5541 new_anon_name[host_pkg_len] = '/';
5542 // Append anonymous class name. The anonymous class name can contain odd
5543 // characters. So, do a strncpy instead of using sprintf("%s...").
5544 strncpy(new_anon_name + host_pkg_len + 1, (char *)_class_name->base(), class_name_len);
5545
5546 // Create a symbol and update the anonymous class name.
5547 _class_name = SymbolTable::new_symbol(new_anon_name,
5548 (int)host_pkg_len + 1 + class_name_len,
5549 CHECK);
5550 }
5551 }
5552
5553 // If the host class and the anonymous class are in the same package then do
5554 // nothing. If the anonymous class is in the unnamed package then move it to its
5555 // host's package. If the classes are in different packages then throw an IAE
5556 // exception.
5557 void ClassFileParser::fix_anonymous_class_name(TRAPS) {
5558 assert(_host_klass != NULL, "Expected an anonymous class");
5559
5560 const jbyte* anon_last_slash = UTF8::strrchr(_class_name->base(),
5561 _class_name->utf8_length(), '/');
5562 if (anon_last_slash == NULL) { // Unnamed package
5563 prepend_host_package_name(_host_klass, CHECK);
5564 } else {
5565 if (!InstanceKlass::is_same_class_package(_host_klass->class_loader(),
5566 _host_klass->name(),
5567 _host_klass->class_loader(),
5568 _class_name)) {
5569 ResourceMark rm(THREAD);
5570 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
5571 err_msg("Host class %s and anonymous class %s are in different packages",
5572 _host_klass->name()->as_C_string(), _class_name->as_C_string()));
5573 }
5574 }
5575 }
5576
5577 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5578 bool trusted = (loader_data->is_the_null_class_loader_data() ||
5579 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
5580 bool need_verify =
5581 // verifyAll
5582 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5583 // verifyRemote
5584 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5585 return !need_verify;
5586 }
5587
5588 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5589 Symbol* name,
5590 ClassLoaderData* loader_data,
5591 Handle protection_domain,
5592 const InstanceKlass* host_klass,
5593 GrowableArray<Handle>* cp_patches,
5594 Publicity pub_level,
5595 TRAPS) :
5596 _stream(stream),
5597 _requested_name(name),
5598 _loader_data(loader_data),
5599 _host_klass(host_klass),
5600 _cp_patches(cp_patches),
5601 _num_patched_klasses(0),
5602 _max_num_patched_klasses(0),
5603 _orig_cp_size(0),
5604 _first_patched_klass_resolved_index(0),
5605 _super_klass(),
5606 _cp(NULL),
5607 _fields(NULL),
5608 _methods(NULL),
5609 _inner_classes(NULL),
5610 _local_interfaces(NULL),
5611 _transitive_interfaces(NULL),
5612 _combined_annotations(NULL),
5613 _annotations(NULL),
5614 _type_annotations(NULL),
5615 _fields_annotations(NULL),
5616 _fields_type_annotations(NULL),
5617 _klass(NULL),
5618 _klass_to_deallocate(NULL),
5619 _parsed_annotations(NULL),
5620 _fac(NULL),
5621 _field_info(NULL),
5622 _method_ordering(NULL),
5623 _all_mirandas(NULL),
5624 _vtable_size(0),
5625 _itable_size(0),
5626 _num_miranda_methods(0),
5627 _rt(REF_NONE),
5628 _protection_domain(protection_domain),
5629 _access_flags(),
5630 _pub_level(pub_level),
5631 _bad_constant_seen(0),
5632 _synthetic_flag(false),
5633 _sde_length(false),
5634 _sde_buffer(NULL),
5635 _sourcefile_index(0),
5636 _generic_signature_index(0),
5637 _major_version(0),
5638 _minor_version(0),
5639 _this_class_index(0),
5640 _super_class_index(0),
5641 _itfs_len(0),
5642 _java_fields_count(0),
5643 _need_verify(false),
5644 _relax_verify(false),
5645 _has_nonstatic_concrete_methods(false),
5646 _declares_nonstatic_concrete_methods(false),
5647 _has_final_method(false),
5648 _has_finalizer(false),
5649 _has_empty_finalizer(false),
5650 _has_vanilla_constructor(false),
5651 _max_bootstrap_specifier_index(-1) {
5652
5653 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
5654
5655 assert(THREAD->is_Java_thread(), "invariant");
5656 assert(_loader_data != NULL, "invariant");
5657 assert(stream != NULL, "invariant");
5658 assert(_stream != NULL, "invariant");
5659 assert(_stream->buffer() == _stream->current(), "invariant");
5660 assert(_class_name != NULL, "invariant");
5661 assert(0 == _access_flags.as_int(), "invariant");
5662
5663 // Figure out whether we can skip format checking (matching classic VM behavior)
5664 if (DumpSharedSpaces) {
5665 // verify == true means it's a 'remote' class (i.e., non-boot class)
5666 // Verification decision is based on BytecodeVerificationRemote flag
5667 // for those classes.
5668 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
5669 BytecodeVerificationLocal;
5670 }
5671 else {
5672 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
5673 stream->need_verify());
5674 }
5675 if (_cp_patches != NULL) {
5676 int len = _cp_patches->length();
5677 for (int i=0; i<len; i++) {
5678 if (has_cp_patch_at(i)) {
5679 Handle patch = cp_patch_at(i);
5680 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
5681 // We need to append the names of the patched classes to the end of the constant pool,
5682 // because a patched class may have a Utf8 name that's not already included in the
5683 // original constant pool. These class names are used when patch_constant_pool()
5684 // calls patch_class().
5685 //
5686 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
5687 // At this point, we don't know the tag for index i yet, because we haven't parsed the
5688 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
5689 _max_num_patched_klasses++;
5690 }
5691 }
5692 }
5693 }
5694
5695 // synch back verification state to stream
5696 stream->set_verify(_need_verify);
5697
5698 // Check if verification needs to be relaxed for this class file
5699 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
5700 _relax_verify = relax_format_check_for(_loader_data);
5701
5702 parse_stream(stream, CHECK);
5703
5704 post_process_parsed_stream(stream, _cp, CHECK);
5705 }
5706
5707 void ClassFileParser::clear_class_metadata() {
5708 // metadata created before the instance klass is created. Must be
5709 // deallocated if classfile parsing returns an error.
5710 _cp = NULL;
5711 _fields = NULL;
5712 _methods = NULL;
5713 _inner_classes = NULL;
5714 _local_interfaces = NULL;
5715 _transitive_interfaces = NULL;
5716 _combined_annotations = NULL;
5717 _annotations = _type_annotations = NULL;
5718 _fields_annotations = _fields_type_annotations = NULL;
5719 }
5720
5721 // Destructor to clean up
5722 ClassFileParser::~ClassFileParser() {
5723 if (_cp != NULL) {
5724 MetadataFactory::free_metadata(_loader_data, _cp);
5725 }
5726 if (_fields != NULL) {
5727 MetadataFactory::free_array<u2>(_loader_data, _fields);
5728 }
5729
5730 if (_methods != NULL) {
5731 // Free methods
5732 InstanceKlass::deallocate_methods(_loader_data, _methods);
5733 }
5734
5735 // beware of the Universe::empty_blah_array!!
5736 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
5737 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5738 }
5739
5740 // Free interfaces
5741 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5742 _local_interfaces, _transitive_interfaces);
5743
5744 if (_combined_annotations != NULL) {
5745 // After all annotations arrays have been created, they are installed into the
5746 // Annotations object that will be assigned to the InstanceKlass being created.
5747
5748 // Deallocate the Annotations object and the installed annotations arrays.
5749 _combined_annotations->deallocate_contents(_loader_data);
5750
5751 // If the _combined_annotations pointer is non-NULL,
5752 // then the other annotations fields should have been cleared.
5753 assert(_annotations == NULL, "Should have been cleared");
5754 assert(_type_annotations == NULL, "Should have been cleared");
5755 assert(_fields_annotations == NULL, "Should have been cleared");
5756 assert(_fields_type_annotations == NULL, "Should have been cleared");
5757 } else {
5758 // If the annotations arrays were not installed into the Annotations object,
5759 // then they have to be deallocated explicitly.
5760 MetadataFactory::free_array<u1>(_loader_data, _annotations);
5761 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
5762 Annotations::free_contents(_loader_data, _fields_annotations);
5763 Annotations::free_contents(_loader_data, _fields_type_annotations);
5764 }
5765
5766 clear_class_metadata();
5767
5768 // deallocate the klass if already created. Don't directly deallocate, but add
5769 // to the deallocate list so that the klass is removed from the CLD::_klasses list
5770 // at a safepoint.
5771 if (_klass_to_deallocate != NULL) {
5772 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5773 }
5774 }
5775
5776 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5777 TRAPS) {
5778
5779 assert(stream != NULL, "invariant");
5780 assert(_class_name != NULL, "invariant");
5781
5782 // BEGIN STREAM PARSING
5783 stream->guarantee_more(8, CHECK); // magic, major, minor
5784 // Magic value
5785 const u4 magic = stream->get_u4_fast();
5786 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5787 "Incompatible magic value %u in class file %s",
5788 magic, CHECK);
5789
5790 // Version numbers
5791 _minor_version = stream->get_u2_fast();
5792 _major_version = stream->get_u2_fast();
5793
5794 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) {
5795 ResourceMark rm;
5796 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
5797 _major_version, _minor_version, _class_name->as_C_string());
5798 Exceptions::fthrow(
5799 THREAD_AND_LOCATION,
5800 vmSymbols::java_lang_UnsupportedClassVersionError(),
5801 "Unsupported major.minor version for dump time %u.%u",
5802 _major_version,
5803 _minor_version);
5804 }
5805
5806 // Check version numbers - we check this even with verifier off
5807 if (!is_supported_version(_major_version, _minor_version)) {
5808 ResourceMark rm(THREAD);
5809 Exceptions::fthrow(
5810 THREAD_AND_LOCATION,
5811 vmSymbols::java_lang_UnsupportedClassVersionError(),
5812 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5813 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
5814 _class_name->as_C_string(),
5815 _major_version,
5816 _minor_version,
5817 JAVA_MAX_SUPPORTED_VERSION,
5818 JAVA_MAX_SUPPORTED_MINOR_VERSION);
5819 return;
5820 }
5821
5822 stream->guarantee_more(3, CHECK); // length, first cp tag
5823 u2 cp_size = stream->get_u2_fast();
5824
5825 guarantee_property(
5826 cp_size >= 1, "Illegal constant pool size %u in class file %s",
5827 cp_size, CHECK);
5828
5829 _orig_cp_size = cp_size;
5830 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
5831 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
5832 }
5833 cp_size += _max_num_patched_klasses;
5834
5835 _cp = ConstantPool::allocate(_loader_data,
5836 cp_size,
5837 CHECK);
5838
5839 ConstantPool* const cp = _cp;
5840
5841 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5842
5843 assert(cp_size == (const u2)cp->length(), "invariant");
5844
5845 // ACCESS FLAGS
5846 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5847
5848 // Access flags
5849 jint flags;
5850 // JVM_ACC_MODULE is defined in JDK-9 and later.
5851 if (_major_version >= JAVA_9_VERSION) {
5852 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5853 } else {
5854 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5855 }
5856
5857 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5858 // Set abstract bit for old class files for backward compatibility
5859 flags |= JVM_ACC_ABSTRACT;
5860 }
5861
5862 verify_legal_class_modifiers(flags, CHECK);
5863
5864 short bad_constant = class_bad_constant_seen();
5865 if (bad_constant != 0) {
5866 // Do not throw CFE until after the access_flags are checked because if
5867 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5868 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
5869 }
5870
5871 _access_flags.set_flags(flags);
5872
5873 // This class and superclass
5874 _this_class_index = stream->get_u2_fast();
5875 check_property(
5876 valid_cp_range(_this_class_index, cp_size) &&
5877 cp->tag_at(_this_class_index).is_unresolved_klass(),
5878 "Invalid this class index %u in constant pool in class file %s",
5879 _this_class_index, CHECK);
5880
5881 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5882 assert(class_name_in_cp != NULL, "class_name can't be null");
5883
5884 // Update _class_name which could be null previously
5885 // to reflect the name in the constant pool
5886 _class_name = class_name_in_cp;
5887
5888 // Don't need to check whether this class name is legal or not.
5889 // It has been checked when constant pool is parsed.
5890 // However, make sure it is not an array type.
5891 if (_need_verify) {
5892 guarantee_property(_class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
5893 "Bad class name in class file %s",
5894 CHECK);
5895 }
5896
5897 // Checks if name in class file matches requested name
5898 if (_requested_name != NULL && _requested_name != _class_name) {
5899 ResourceMark rm(THREAD);
5900 Exceptions::fthrow(
5901 THREAD_AND_LOCATION,
5902 vmSymbols::java_lang_NoClassDefFoundError(),
5903 "%s (wrong name: %s)",
5904 _class_name->as_C_string(),
5905 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
5906 );
5907 return;
5908 }
5909
5910 // if this is an anonymous class fix up its name if it's in the unnamed
5911 // package. Otherwise, throw IAE if it is in a different package than
5912 // its host class.
5913 if (_host_klass != NULL) {
5914 fix_anonymous_class_name(CHECK);
5915 }
5916
5917 // Verification prevents us from creating names with dots in them, this
5918 // asserts that that's the case.
5919 assert(is_internal_format(_class_name), "external class name format used internally");
5920
5921 if (!is_internal()) {
5922 if (log_is_enabled(Debug, class, preorder)){
5923 ResourceMark rm(THREAD);
5924 outputStream* log = Log(class, preorder)::debug_stream();
5925 log->print("%s", _class_name->as_klass_external_name());
5926 if (stream->source() != NULL) {
5927 log->print(" source: %s", stream->source());
5928 }
5929 log->cr();
5930 }
5931
5932 #if INCLUDE_CDS
5933 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
5934 // Only dump the classes that can be stored into CDS archive.
5935 // Anonymous classes such as generated LambdaForm classes are also not included.
5936 if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
5937 _host_klass == NULL) {
5938 oop class_loader = _loader_data->class_loader();
5939 ResourceMark rm(THREAD);
5940 // For the boot and platform class loaders, check if the class is not found in the
5941 // java runtime image. Additional check for the boot class loader is if the class
5942 // is not found in the boot loader's appended entries. This indicates that the class
5943 // is not useable during run time, such as the ones found in the --patch-module entries,
5944 // so it should not be included in the classlist file.
5945 if (((class_loader == NULL && !ClassLoader::contains_append_entry(stream->source())) ||
5946 SystemDictionary::is_platform_class_loader(class_loader)) &&
5947 !ClassLoader::is_jrt(stream->source())) {
5948 tty->print_cr("skip writing class %s from source %s to classlist file",
5949 _class_name->as_C_string(), stream->source());
5950 } else {
5951 classlist_file->print_cr("%s", _class_name->as_C_string());
5952 classlist_file->flush();
5953 }
5954 }
5955 }
5956 #endif
5957 }
5958
5959 // SUPERKLASS
5960 _super_class_index = stream->get_u2_fast();
5961 _super_klass = parse_super_class(cp,
5962 _super_class_index,
5963 _need_verify,
5964 CHECK);
5965
5966 // Interfaces
5967 _itfs_len = stream->get_u2_fast();
5968 parse_interfaces(stream,
5969 _itfs_len,
5970 cp,
5971 &_has_nonstatic_concrete_methods,
5972 CHECK);
5973
5974 assert(_local_interfaces != NULL, "invariant");
5975
5976 // Fields (offsets are filled in later)
5977 _fac = new FieldAllocationCount();
5978 parse_fields(stream,
5979 _access_flags.is_interface(),
5980 _fac,
5981 cp,
5982 cp_size,
5983 &_java_fields_count,
5984 CHECK);
5985
5986 assert(_fields != NULL, "invariant");
5987
5988 // Methods
5989 AccessFlags promoted_flags;
5990 parse_methods(stream,
5991 _access_flags.is_interface(),
5992 &promoted_flags,
5993 &_has_final_method,
5994 &_declares_nonstatic_concrete_methods,
5995 CHECK);
5996
5997 assert(_methods != NULL, "invariant");
5998
5999 // promote flags from parse_methods() to the klass' flags
6000 _access_flags.add_promoted_flags(promoted_flags.as_int());
6001
6002 if (_declares_nonstatic_concrete_methods) {
6003 _has_nonstatic_concrete_methods = true;
6004 }
6005
6006 // Additional attributes/annotations
6007 _parsed_annotations = new ClassAnnotationCollector();
6008 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6009
6010 assert(_inner_classes != NULL, "invariant");
6011
6012 // Finalize the Annotations metadata object,
6013 // now that all annotation arrays have been created.
6014 create_combined_annotations(CHECK);
6015
6016 // Make sure this is the end of class file stream
6017 guarantee_property(stream->at_eos(),
6018 "Extra bytes at the end of class file %s",
6019 CHECK);
6020
6021 // all bytes in stream read and parsed
6022 }
6023
6024 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6025 ConstantPool* cp,
6026 TRAPS) {
6027 assert(stream != NULL, "invariant");
6028 assert(stream->at_eos(), "invariant");
6029 assert(cp != NULL, "invariant");
6030 assert(_loader_data != NULL, "invariant");
6031
6032 if (_class_name == vmSymbols::java_lang_Object()) {
6033 check_property(_local_interfaces == Universe::the_empty_klass_array(),
6034 "java.lang.Object cannot implement an interface in class file %s",
6035 CHECK);
6036 }
6037 // We check super class after class file is parsed and format is checked
6038 if (_super_class_index > 0 && NULL ==_super_klass) {
6039 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6040 if (_access_flags.is_interface()) {
6041 // Before attempting to resolve the superclass, check for class format
6042 // errors not checked yet.
6043 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6044 "Interfaces must have java.lang.Object as superclass in class file %s",
6045 CHECK);
6046 }
6047 Handle loader(THREAD, _loader_data->class_loader());
6048 _super_klass = (const InstanceKlass*)
6049 SystemDictionary::resolve_super_or_fail(_class_name,
6050 super_class_name,
6051 loader,
6052 _protection_domain,
6053 true,
6054 CHECK);
6055 }
6056
6057 if (_super_klass != NULL) {
6058 if (_super_klass->has_nonstatic_concrete_methods()) {
6059 _has_nonstatic_concrete_methods = true;
6060 }
6061
6062 if (_super_klass->is_interface()) {
6063 ResourceMark rm(THREAD);
6064 Exceptions::fthrow(
6065 THREAD_AND_LOCATION,
6066 vmSymbols::java_lang_IncompatibleClassChangeError(),
6067 "class %s has interface %s as super class",
6068 _class_name->as_klass_external_name(),
6069 _super_klass->external_name()
6070 );
6071 return;
6072 }
6073 // Make sure super class is not final
6074 if (_super_klass->is_final()) {
6075 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6076 }
6077 }
6078
6079 // Compute the transitive list of all unique interfaces implemented by this class
6080 _transitive_interfaces =
6081 compute_transitive_interfaces(_super_klass,
6082 _local_interfaces,
6083 _loader_data,
6084 CHECK);
6085
6086 assert(_transitive_interfaces != NULL, "invariant");
6087
6088 // sort methods
6089 _method_ordering = sort_methods(_methods);
6090
6091 _all_mirandas = new GrowableArray<Method*>(20);
6092
6093 Handle loader(THREAD, _loader_data->class_loader());
6094 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6095 &_num_miranda_methods,
6096 _all_mirandas,
6097 _super_klass,
6098 _methods,
6099 _access_flags,
6100 _major_version,
6101 loader,
6102 _class_name,
6103 _local_interfaces,
6104 CHECK);
6105
6106 // Size of Java itable (in words)
6107 _itable_size = _access_flags.is_interface() ? 0 :
6108 klassItable::compute_itable_size(_transitive_interfaces);
6109
6110 assert(_fac != NULL, "invariant");
6111 assert(_parsed_annotations != NULL, "invariant");
6112
6113 _field_info = new FieldLayoutInfo();
6114 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6115
6116 // Compute reference typ
6117 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6118
6119 }
6120
6121 void ClassFileParser::set_klass(InstanceKlass* klass) {
6122
6123 #ifdef ASSERT
6124 if (klass != NULL) {
6125 assert(NULL == _klass, "leaking?");
6126 }
6127 #endif
6128
6129 _klass = klass;
6130 }
6131
6132 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6133
6134 #ifdef ASSERT
6135 if (klass != NULL) {
6136 assert(NULL == _klass_to_deallocate, "leaking?");
6137 }
6138 #endif
6139
6140 _klass_to_deallocate = klass;
6141 }
6142
6143 // Caller responsible for ResourceMark
6144 // clone stream with rewound position
6145 const ClassFileStream* ClassFileParser::clone_stream() const {
6146 assert(_stream != NULL, "invariant");
6147
6148 return _stream->clone();
6149 }
6150 // ----------------------------------------------------------------------------
6151 // debugging
6152
6153 #ifdef ASSERT
6154
6155 // return true if class_name contains no '.' (internal format is '/')
6156 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6157 if (class_name != NULL) {
6158 ResourceMark rm;
6159 char* name = class_name->as_C_string();
6160 return strchr(name, '.') == NULL;
6161 } else {
6162 return true;
6163 }
6164 }
6165
6166 #endif