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