1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24 #include "precompiled.hpp"
25 #include "jvm.h"
26 #include "aot/aotLoader.hpp"
27 #include "classfile/classFileParser.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/defaultMethods.hpp"
32 #include "classfile/dictionary.hpp"
33 #include "classfile/javaClasses.inline.hpp"
34 #include "classfile/moduleEntry.hpp"
35 #include "classfile/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/verificationType.hpp"
38 #include "classfile/verifier.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/allocation.hpp"
43 #include "memory/metadataFactory.hpp"
44 #include "memory/oopFactory.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "memory/universe.hpp"
47 #include "oops/annotations.hpp"
48 #include "oops/constantPool.inline.hpp"
49 #include "oops/fieldStreams.hpp"
50 #include "oops/instanceKlass.hpp"
51 #include "oops/instanceMirrorKlass.hpp"
52 #include "oops/klass.inline.hpp"
53 #include "oops/klassVtable.hpp"
54 #include "oops/metadata.hpp"
55 #include "oops/method.hpp"
56 #include "oops/oop.inline.hpp"
57 #include "oops/symbol.hpp"
58 #include "prims/jvmtiExport.hpp"
59 #include "prims/jvmtiThreadState.hpp"
60 #include "runtime/arguments.hpp"
61 #include "runtime/handles.inline.hpp"
62 #include "runtime/javaCalls.hpp"
63 #include "runtime/perfData.hpp"
64 #include "runtime/reflection.hpp"
65 #include "runtime/safepointVerifiers.hpp"
66 #include "runtime/signature.hpp"
67 #include "runtime/timer.hpp"
68 #include "services/classLoadingService.hpp"
69 #include "services/threadService.hpp"
70 #include "utilities/align.hpp"
71 #include "utilities/bitMap.inline.hpp"
72 #include "utilities/copy.hpp"
73 #include "utilities/exceptions.hpp"
74 #include "utilities/globalDefinitions.hpp"
75 #include "utilities/growableArray.hpp"
76 #include "utilities/macros.hpp"
77 #include "utilities/ostream.hpp"
78 #include "utilities/resourceHash.hpp"
79 #if INCLUDE_CDS
80 #include "classfile/systemDictionaryShared.hpp"
81 #endif
82 #if INCLUDE_JFR
83 #include "jfr/support/jfrTraceIdExtension.hpp"
84 #endif
85
86 // We generally try to create the oops directly when parsing, rather than
87 // allocating temporary data structures and copying the bytes twice. A
88 // temporary area is only needed when parsing utf8 entries in the constant
89 // pool and when parsing line number tables.
90
91 // We add assert in debug mode when class format is not checked.
92
93 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
94 #define JAVA_MIN_SUPPORTED_VERSION 45
95 #define JAVA_PREVIEW_MINOR_VERSION 65535
96
97 // Used for two backward compatibility reasons:
98 // - to check for new additions to the class file format in JDK1.5
99 // - to check for bug fixes in the format checker in JDK1.5
100 #define JAVA_1_5_VERSION 49
101
102 // Used for backward compatibility reasons:
103 // - to check for javac bug fixes that happened after 1.5
104 // - also used as the max version when running in jdk6
105 #define JAVA_6_VERSION 50
106
107 // Used for backward compatibility reasons:
108 // - to disallow argument and require ACC_STATIC for <clinit> methods
109 #define JAVA_7_VERSION 51
110
111 // Extension method support.
112 #define JAVA_8_VERSION 52
113
114 #define JAVA_9_VERSION 53
115
116 #define JAVA_10_VERSION 54
117
118 #define JAVA_11_VERSION 55
119
120 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
121 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION,
122 "Unexpected bad constant pool entry");
123 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
124 }
125
126 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
127 ConstantPool* cp,
128 const int length,
129 TRAPS) {
130 assert(stream != NULL, "invariant");
131 assert(cp != NULL, "invariant");
132
133 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
134 // this function (_current can be allocated in a register, with scalar
135 // replacement of aggregates). The _current pointer is copied back to
136 // stream() when this function returns. DON'T call another method within
137 // this method that uses stream().
138 const ClassFileStream cfs1 = *stream;
139 const ClassFileStream* const cfs = &cfs1;
140
141 assert(cfs->allocated_on_stack(), "should be local");
142 debug_only(const u1* const old_current = stream->current();)
143
144 // Used for batching symbol allocations.
145 const char* names[SymbolTable::symbol_alloc_batch_size];
146 int lengths[SymbolTable::symbol_alloc_batch_size];
147 int indices[SymbolTable::symbol_alloc_batch_size];
148 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
149 int names_count = 0;
150
151 // parsing Index 0 is unused
152 for (int index = 1; index < length; index++) {
153 // Each of the following case guarantees one more byte in the stream
154 // for the following tag or the access_flags following constant pool,
155 // so we don't need bounds-check for reading tag.
156 const u1 tag = cfs->get_u1_fast();
157 switch (tag) {
158 case JVM_CONSTANT_Class : {
159 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
160 const u2 name_index = cfs->get_u2_fast();
161 cp->klass_index_at_put(index, name_index);
162 break;
163 }
164 case JVM_CONSTANT_Fieldref: {
165 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
166 const u2 class_index = cfs->get_u2_fast();
167 const u2 name_and_type_index = cfs->get_u2_fast();
168 cp->field_at_put(index, class_index, name_and_type_index);
169 break;
170 }
171 case JVM_CONSTANT_Methodref: {
172 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
173 const u2 class_index = cfs->get_u2_fast();
174 const u2 name_and_type_index = cfs->get_u2_fast();
175 cp->method_at_put(index, class_index, name_and_type_index);
176 break;
177 }
178 case JVM_CONSTANT_InterfaceMethodref: {
179 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
180 const u2 class_index = cfs->get_u2_fast();
181 const u2 name_and_type_index = cfs->get_u2_fast();
182 cp->interface_method_at_put(index, class_index, name_and_type_index);
183 break;
184 }
185 case JVM_CONSTANT_String : {
186 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
187 const u2 string_index = cfs->get_u2_fast();
188 cp->string_index_at_put(index, string_index);
189 break;
190 }
191 case JVM_CONSTANT_MethodHandle :
192 case JVM_CONSTANT_MethodType: {
193 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
194 classfile_parse_error(
195 "Class file version does not support constant tag %u in class file %s",
196 tag, CHECK);
197 }
198 if (tag == JVM_CONSTANT_MethodHandle) {
199 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
200 const u1 ref_kind = cfs->get_u1_fast();
201 const u2 method_index = cfs->get_u2_fast();
202 cp->method_handle_index_at_put(index, ref_kind, method_index);
203 }
204 else if (tag == JVM_CONSTANT_MethodType) {
205 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
206 const u2 signature_index = cfs->get_u2_fast();
207 cp->method_type_index_at_put(index, signature_index);
208 }
209 else {
210 ShouldNotReachHere();
211 }
212 break;
213 }
214 case JVM_CONSTANT_Dynamic : {
215 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
216 classfile_parse_error(
217 "Class file version does not support constant tag %u in class file %s",
218 tag, CHECK);
219 }
220 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
221 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
222 const u2 name_and_type_index = cfs->get_u2_fast();
223 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
224 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
225 }
226 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
227 break;
228 }
229 case JVM_CONSTANT_InvokeDynamic : {
230 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
231 classfile_parse_error(
232 "Class file version does not support constant tag %u in class file %s",
233 tag, CHECK);
234 }
235 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
236 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
237 const u2 name_and_type_index = cfs->get_u2_fast();
238 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
239 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
240 }
241 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
242 break;
243 }
244 case JVM_CONSTANT_Integer: {
245 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
246 const u4 bytes = cfs->get_u4_fast();
247 cp->int_at_put(index, (jint)bytes);
248 break;
249 }
250 case JVM_CONSTANT_Float: {
251 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
252 const u4 bytes = cfs->get_u4_fast();
253 cp->float_at_put(index, *(jfloat*)&bytes);
254 break;
255 }
256 case JVM_CONSTANT_Long: {
257 // A mangled type might cause you to overrun allocated memory
258 guarantee_property(index + 1 < length,
259 "Invalid constant pool entry %u in class file %s",
260 index,
261 CHECK);
262 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
263 const u8 bytes = cfs->get_u8_fast();
264 cp->long_at_put(index, bytes);
265 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
266 break;
267 }
268 case JVM_CONSTANT_Double: {
269 // A mangled type might cause you to overrun allocated memory
270 guarantee_property(index+1 < length,
271 "Invalid constant pool entry %u in class file %s",
272 index,
273 CHECK);
274 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
275 const u8 bytes = cfs->get_u8_fast();
276 cp->double_at_put(index, *(jdouble*)&bytes);
277 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
278 break;
279 }
280 case JVM_CONSTANT_NameAndType: {
281 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
282 const u2 name_index = cfs->get_u2_fast();
283 const u2 signature_index = cfs->get_u2_fast();
284 cp->name_and_type_at_put(index, name_index, signature_index);
285 break;
286 }
287 case JVM_CONSTANT_Utf8 : {
288 cfs->guarantee_more(2, CHECK); // utf8_length
289 u2 utf8_length = cfs->get_u2_fast();
290 const u1* utf8_buffer = cfs->current();
291 assert(utf8_buffer != NULL, "null utf8 buffer");
292 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
293 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
294 cfs->skip_u1_fast(utf8_length);
295
296 // Before storing the symbol, make sure it's legal
297 if (_need_verify) {
298 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
299 }
300
301 if (has_cp_patch_at(index)) {
302 Handle patch = clear_cp_patch_at(index);
303 guarantee_property(java_lang_String::is_instance(patch()),
304 "Illegal utf8 patch at %d in class file %s",
305 index,
306 CHECK);
307 const char* const str = java_lang_String::as_utf8_string(patch());
308 // (could use java_lang_String::as_symbol instead, but might as well batch them)
309 utf8_buffer = (const u1*) str;
310 utf8_length = (int) strlen(str);
311 }
312
313 unsigned int hash;
314 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
315 utf8_length,
316 hash);
317 if (result == NULL) {
318 names[names_count] = (const char*)utf8_buffer;
319 lengths[names_count] = utf8_length;
320 indices[names_count] = index;
321 hashValues[names_count++] = hash;
322 if (names_count == SymbolTable::symbol_alloc_batch_size) {
323 SymbolTable::new_symbols(_loader_data,
324 cp,
325 names_count,
326 names,
327 lengths,
328 indices,
329 hashValues,
330 CHECK);
331 names_count = 0;
332 }
333 } else {
334 cp->symbol_at_put(index, result);
335 }
336 break;
337 }
338 case 19:
339 case 20: {
340 // Record that an error occurred in these two cases but keep parsing so
341 // that ACC_Module can be checked for in the access_flags. Need to
342 // throw NoClassDefFoundError in that case.
343 if (_major_version >= JAVA_9_VERSION) {
344 cfs->guarantee_more(3, CHECK);
345 cfs->get_u2_fast();
346 set_class_bad_constant_seen(tag);
347 break;
348 }
349 }
350 default: {
351 classfile_parse_error("Unknown constant tag %u in class file %s",
352 tag,
353 CHECK);
354 break;
355 }
356 } // end of switch(tag)
357 } // end of for
358
359 // Allocate the remaining symbols
360 if (names_count > 0) {
361 SymbolTable::new_symbols(_loader_data,
362 cp,
363 names_count,
364 names,
365 lengths,
366 indices,
367 hashValues,
368 CHECK);
369 }
370
371 // Copy _current pointer of local copy back to stream.
372 assert(stream->current() == old_current, "non-exclusive use of stream");
373 stream->set_current(cfs1.current());
374
375 }
376
377 static inline bool valid_cp_range(int index, int length) {
378 return (index > 0 && index < length);
379 }
380
381 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
382 assert(cp != NULL, "invariant");
383 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
384 return cp->symbol_at(index);
385 }
386 return NULL;
387 }
388
389 #ifdef ASSERT
390 PRAGMA_DIAG_PUSH
391 PRAGMA_FORMAT_NONLITERAL_IGNORED
392 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
393 ResourceMark rm(THREAD);
394 fatal(msg, _class_name->as_C_string());
395 }
396
397 void ClassFileParser::report_assert_property_failure(const char* msg,
398 int index,
399 TRAPS) const {
400 ResourceMark rm(THREAD);
401 fatal(msg, index, _class_name->as_C_string());
402 }
403 PRAGMA_DIAG_POP
404 #endif
405
406 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
407 ConstantPool* const cp,
408 const int length,
409 TRAPS) {
410 assert(cp != NULL, "invariant");
411 assert(stream != NULL, "invariant");
412
413 // parsing constant pool entries
414 parse_constant_pool_entries(stream, cp, length, CHECK);
415 if (class_bad_constant_seen() != 0) {
416 // a bad CP entry has been detected previously so stop parsing and just return.
417 return;
418 }
419
420 int index = 1; // declared outside of loops for portability
421 int num_klasses = 0;
422
423 // first verification pass - validate cross references
424 // and fixup class and string constants
425 for (index = 1; index < length; index++) { // Index 0 is unused
426 const jbyte tag = cp->tag_at(index).value();
427 switch (tag) {
428 case JVM_CONSTANT_Class: {
429 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
430 break;
431 }
432 case JVM_CONSTANT_Fieldref:
433 // fall through
434 case JVM_CONSTANT_Methodref:
435 // fall through
436 case JVM_CONSTANT_InterfaceMethodref: {
437 if (!_need_verify) break;
438 const int klass_ref_index = cp->klass_ref_index_at(index);
439 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
440 check_property(valid_klass_reference_at(klass_ref_index),
441 "Invalid constant pool index %u in class file %s",
442 klass_ref_index, CHECK);
443 check_property(valid_cp_range(name_and_type_ref_index, length) &&
444 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
445 "Invalid constant pool index %u in class file %s",
446 name_and_type_ref_index, CHECK);
447 break;
448 }
449 case JVM_CONSTANT_String: {
450 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
451 break;
452 }
453 case JVM_CONSTANT_Integer:
454 break;
455 case JVM_CONSTANT_Float:
456 break;
457 case JVM_CONSTANT_Long:
458 case JVM_CONSTANT_Double: {
459 index++;
460 check_property(
461 (index < length && cp->tag_at(index).is_invalid()),
462 "Improper constant pool long/double index %u in class file %s",
463 index, CHECK);
464 break;
465 }
466 case JVM_CONSTANT_NameAndType: {
467 if (!_need_verify) break;
468 const int name_ref_index = cp->name_ref_index_at(index);
469 const int signature_ref_index = cp->signature_ref_index_at(index);
470 check_property(valid_symbol_at(name_ref_index),
471 "Invalid constant pool index %u in class file %s",
472 name_ref_index, CHECK);
473 check_property(valid_symbol_at(signature_ref_index),
474 "Invalid constant pool index %u in class file %s",
475 signature_ref_index, CHECK);
476 break;
477 }
478 case JVM_CONSTANT_Utf8:
479 break;
480 case JVM_CONSTANT_UnresolvedClass: // fall-through
481 case JVM_CONSTANT_UnresolvedClassInError: {
482 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
483 break;
484 }
485 case JVM_CONSTANT_ClassIndex: {
486 const int class_index = cp->klass_index_at(index);
487 check_property(valid_symbol_at(class_index),
488 "Invalid constant pool index %u in class file %s",
489 class_index, CHECK);
490 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
491 break;
492 }
493 case JVM_CONSTANT_StringIndex: {
494 const int string_index = cp->string_index_at(index);
495 check_property(valid_symbol_at(string_index),
496 "Invalid constant pool index %u in class file %s",
497 string_index, CHECK);
498 Symbol* const sym = cp->symbol_at(string_index);
499 cp->unresolved_string_at_put(index, sym);
500 break;
501 }
502 case JVM_CONSTANT_MethodHandle: {
503 const int ref_index = cp->method_handle_index_at(index);
504 check_property(valid_cp_range(ref_index, length),
505 "Invalid constant pool index %u in class file %s",
506 ref_index, CHECK);
507 const constantTag tag = cp->tag_at(ref_index);
508 const int ref_kind = cp->method_handle_ref_kind_at(index);
509
510 switch (ref_kind) {
511 case JVM_REF_getField:
512 case JVM_REF_getStatic:
513 case JVM_REF_putField:
514 case JVM_REF_putStatic: {
515 check_property(
516 tag.is_field(),
517 "Invalid constant pool index %u in class file %s (not a field)",
518 ref_index, CHECK);
519 break;
520 }
521 case JVM_REF_invokeVirtual:
522 case JVM_REF_newInvokeSpecial: {
523 check_property(
524 tag.is_method(),
525 "Invalid constant pool index %u in class file %s (not a method)",
526 ref_index, CHECK);
527 break;
528 }
529 case JVM_REF_invokeStatic:
530 case JVM_REF_invokeSpecial: {
531 check_property(
532 tag.is_method() ||
533 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
534 "Invalid constant pool index %u in class file %s (not a method)",
535 ref_index, CHECK);
536 break;
537 }
538 case JVM_REF_invokeInterface: {
539 check_property(
540 tag.is_interface_method(),
541 "Invalid constant pool index %u in class file %s (not an interface method)",
542 ref_index, CHECK);
543 break;
544 }
545 default: {
546 classfile_parse_error(
547 "Bad method handle kind at constant pool index %u in class file %s",
548 index, CHECK);
549 }
550 } // switch(refkind)
551 // Keep the ref_index unchanged. It will be indirected at link-time.
552 break;
553 } // case MethodHandle
554 case JVM_CONSTANT_MethodType: {
555 const int ref_index = cp->method_type_index_at(index);
556 check_property(valid_symbol_at(ref_index),
557 "Invalid constant pool index %u in class file %s",
558 ref_index, CHECK);
559 break;
560 }
561 case JVM_CONSTANT_Dynamic: {
562 const int name_and_type_ref_index =
563 cp->invoke_dynamic_name_and_type_ref_index_at(index);
564
565 check_property(valid_cp_range(name_and_type_ref_index, length) &&
566 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
567 "Invalid constant pool index %u in class file %s",
568 name_and_type_ref_index, CHECK);
569 // bootstrap specifier index must be checked later,
570 // when BootstrapMethods attr is available
571
572 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
573 cp->set_has_dynamic_constant();
574 break;
575 }
576 case JVM_CONSTANT_InvokeDynamic: {
577 const int name_and_type_ref_index =
578 cp->invoke_dynamic_name_and_type_ref_index_at(index);
579
580 check_property(valid_cp_range(name_and_type_ref_index, length) &&
581 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
582 "Invalid constant pool index %u in class file %s",
583 name_and_type_ref_index, CHECK);
584 // bootstrap specifier index must be checked later,
585 // when BootstrapMethods attr is available
586 break;
587 }
588 default: {
589 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
590 ShouldNotReachHere();
591 break;
592 }
593 } // switch(tag)
594 } // end of for
595
596 _first_patched_klass_resolved_index = num_klasses;
597 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
598
599 if (_cp_patches != NULL) {
600 // need to treat this_class specially...
601
602 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
603 // for now. These will be replaced with actual names of the patched classes in patch_class().
604 Symbol* s = vmSymbols::star_name();
605 for (int n=_orig_cp_size; n<cp->length(); n++) {
606 cp->symbol_at_put(n, s);
607 }
608
609 int this_class_index;
610 {
611 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
612 const u1* const mark = stream->current();
613 stream->skip_u2_fast(1); // skip flags
614 this_class_index = stream->get_u2_fast();
615 stream->set_current(mark); // revert to mark
616 }
617
618 for (index = 1; index < length; index++) { // Index 0 is unused
619 if (has_cp_patch_at(index)) {
620 guarantee_property(index != this_class_index,
621 "Illegal constant pool patch to self at %d in class file %s",
622 index, CHECK);
623 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
624 }
625 }
626 }
627
628 if (!_need_verify) {
629 return;
630 }
631
632 // second verification pass - checks the strings are of the right format.
633 // but not yet to the other entries
634 for (index = 1; index < length; index++) {
635 const jbyte tag = cp->tag_at(index).value();
636 switch (tag) {
637 case JVM_CONSTANT_UnresolvedClass: {
638 const Symbol* const class_name = cp->klass_name_at(index);
639 // check the name, even if _cp_patches will overwrite it
640 verify_legal_class_name(class_name, CHECK);
641 break;
642 }
643 case JVM_CONSTANT_NameAndType: {
644 if (_need_verify) {
645 const int sig_index = cp->signature_ref_index_at(index);
646 const int name_index = cp->name_ref_index_at(index);
647 const Symbol* const name = cp->symbol_at(name_index);
648 const Symbol* const sig = cp->symbol_at(sig_index);
649 guarantee_property(sig->utf8_length() != 0,
650 "Illegal zero length constant pool entry at %d in class %s",
651 sig_index, CHECK);
652 guarantee_property(name->utf8_length() != 0,
653 "Illegal zero length constant pool entry at %d in class %s",
654 name_index, CHECK);
655
656 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
657 // Format check method name and signature
658 verify_legal_method_name(name, CHECK);
659 verify_legal_method_signature(name, sig, CHECK);
660 } else {
661 // Format check field name and signature
662 verify_legal_field_name(name, CHECK);
663 verify_legal_field_signature(name, sig, CHECK);
664 }
665 }
666 break;
667 }
668 case JVM_CONSTANT_Dynamic: {
669 const int name_and_type_ref_index =
670 cp->name_and_type_ref_index_at(index);
671 // already verified to be utf8
672 const int name_ref_index =
673 cp->name_ref_index_at(name_and_type_ref_index);
674 // already verified to be utf8
675 const int signature_ref_index =
676 cp->signature_ref_index_at(name_and_type_ref_index);
677 const Symbol* const name = cp->symbol_at(name_ref_index);
678 const Symbol* const signature = cp->symbol_at(signature_ref_index);
679 if (_need_verify) {
680 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
681 // Need only to be sure signature is non-zero length and the right type.
682 if (signature->utf8_length() == 0 ||
683 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
684 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
685 }
686 }
687 break;
688 }
689 case JVM_CONSTANT_InvokeDynamic:
690 case JVM_CONSTANT_Fieldref:
691 case JVM_CONSTANT_Methodref:
692 case JVM_CONSTANT_InterfaceMethodref: {
693 const int name_and_type_ref_index =
694 cp->name_and_type_ref_index_at(index);
695 // already verified to be utf8
696 const int name_ref_index =
697 cp->name_ref_index_at(name_and_type_ref_index);
698 // already verified to be utf8
699 const int signature_ref_index =
700 cp->signature_ref_index_at(name_and_type_ref_index);
701 const Symbol* const name = cp->symbol_at(name_ref_index);
702 const Symbol* const signature = cp->symbol_at(signature_ref_index);
703 if (tag == JVM_CONSTANT_Fieldref) {
704 if (_need_verify) {
705 // Field name and signature are verified above, when iterating NameAndType_info.
706 // Need only to be sure signature is non-zero length and the right type.
707 if (signature->utf8_length() == 0 ||
708 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
709 throwIllegalSignature("Field", name, signature, CHECK);
710 }
711 }
712 } else {
713 if (_need_verify) {
714 // Method name and signature are verified above, when iterating NameAndType_info.
715 // Need only to be sure signature is non-zero length and the right type.
716 if (signature->utf8_length() == 0 ||
717 signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
718 throwIllegalSignature("Method", name, signature, CHECK);
719 }
720 }
721 // 4509014: If a class method name begins with '<', it must be "<init>"
722 const unsigned int name_len = name->utf8_length();
723 if (tag == JVM_CONSTANT_Methodref &&
724 name_len != 0 &&
725 name->byte_at(0) == '<' &&
726 name != vmSymbols::object_initializer_name()) {
727 classfile_parse_error(
728 "Bad method name at constant pool index %u in class file %s",
729 name_ref_index, CHECK);
730 }
731 }
732 break;
733 }
734 case JVM_CONSTANT_MethodHandle: {
735 const int ref_index = cp->method_handle_index_at(index);
736 const int ref_kind = cp->method_handle_ref_kind_at(index);
737 switch (ref_kind) {
738 case JVM_REF_invokeVirtual:
739 case JVM_REF_invokeStatic:
740 case JVM_REF_invokeSpecial:
741 case JVM_REF_newInvokeSpecial: {
742 const int name_and_type_ref_index =
743 cp->name_and_type_ref_index_at(ref_index);
744 const int name_ref_index =
745 cp->name_ref_index_at(name_and_type_ref_index);
746 const Symbol* const name = cp->symbol_at(name_ref_index);
747 if (ref_kind == JVM_REF_newInvokeSpecial) {
748 if (name != vmSymbols::object_initializer_name()) {
749 classfile_parse_error(
750 "Bad constructor name at constant pool index %u in class file %s",
751 name_ref_index, CHECK);
752 }
753 } else {
754 if (name == vmSymbols::object_initializer_name()) {
755 classfile_parse_error(
756 "Bad method name at constant pool index %u in class file %s",
757 name_ref_index, CHECK);
758 }
759 }
760 break;
761 }
762 // Other ref_kinds are already fully checked in previous pass.
763 } // switch(ref_kind)
764 break;
765 }
766 case JVM_CONSTANT_MethodType: {
767 const Symbol* const no_name = vmSymbols::type_name(); // place holder
768 const Symbol* const signature = cp->method_type_signature_at(index);
769 verify_legal_method_signature(no_name, signature, CHECK);
770 break;
771 }
772 case JVM_CONSTANT_Utf8: {
773 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
774 }
775 } // switch(tag)
776 } // end of for
777 }
778
779 Handle ClassFileParser::clear_cp_patch_at(int index) {
780 Handle patch = cp_patch_at(index);
781 _cp_patches->at_put(index, Handle());
782 assert(!has_cp_patch_at(index), "");
783 return patch;
784 }
785
786 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
787 int name_index = _orig_cp_size + _num_patched_klasses;
788 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
789
790 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
791 _num_patched_klasses ++;
792 }
793
794 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
795 int index,
796 Handle patch,
797 TRAPS) {
798 assert(cp != NULL, "invariant");
799
800 BasicType patch_type = T_VOID;
801
802 switch (cp->tag_at(index).value()) {
803
804 case JVM_CONSTANT_UnresolvedClass: {
805 // Patching a class means pre-resolving it.
806 // The name in the constant pool is ignored.
807 if (java_lang_Class::is_instance(patch())) {
808 guarantee_property(!java_lang_Class::is_primitive(patch()),
809 "Illegal class patch at %d in class file %s",
810 index, CHECK);
811 Klass* k = java_lang_Class::as_Klass(patch());
812 patch_class(cp, index, k, k->name());
813 } else {
814 guarantee_property(java_lang_String::is_instance(patch()),
815 "Illegal class patch at %d in class file %s",
816 index, CHECK);
817 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK);
818 patch_class(cp, index, NULL, name);
819 }
820 break;
821 }
822
823 case JVM_CONSTANT_String: {
824 // skip this patch and don't clear it. Needs the oop array for resolved
825 // references to be created first.
826 return;
827 }
828 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
829 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
830 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
831 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
832 patch_prim:
833 {
834 jvalue value;
835 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
836 guarantee_property(value_type == patch_type,
837 "Illegal primitive patch at %d in class file %s",
838 index, CHECK);
839 switch (value_type) {
840 case T_INT: cp->int_at_put(index, value.i); break;
841 case T_FLOAT: cp->float_at_put(index, value.f); break;
842 case T_LONG: cp->long_at_put(index, value.j); break;
843 case T_DOUBLE: cp->double_at_put(index, value.d); break;
844 default: assert(false, "");
845 }
846 } // end patch_prim label
847 break;
848
849 default: {
850 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
851 guarantee_property(!has_cp_patch_at(index),
852 "Illegal unexpected patch at %d in class file %s",
853 index, CHECK);
854 return;
855 }
856 } // end of switch(tag)
857
858 // On fall-through, mark the patch as used.
859 clear_cp_patch_at(index);
860 }
861 class NameSigHash: public ResourceObj {
862 public:
863 const Symbol* _name; // name
864 const Symbol* _sig; // signature
865 NameSigHash* _next; // Next entry in hash table
866 };
867
868 static const int HASH_ROW_SIZE = 256;
869
870 static unsigned int hash(const Symbol* name, const Symbol* sig) {
871 unsigned int raw_hash = 0;
872 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
873 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
874
875 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
876 }
877
878
879 static void initialize_hashtable(NameSigHash** table) {
880 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
881 }
882 // Return false if the name/sig combination is found in table.
883 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
884 // The old format checker uses heap sort to find duplicates.
885 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
886 // of table since we don't expect Symbol*'s to move.
887 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
888 assert(name != NULL, "name in constant pool is NULL");
889
890 // First lookup for duplicates
891 int index = hash(name, sig);
892 NameSigHash* entry = table[index];
893 while (entry != NULL) {
894 if (entry->_name == name && entry->_sig == sig) {
895 return false;
896 }
897 entry = entry->_next;
898 }
899
900 // No duplicate is found, allocate a new entry and fill it.
901 entry = new NameSigHash();
902 entry->_name = name;
903 entry->_sig = sig;
904
905 // Insert into hash table
906 entry->_next = table[index];
907 table[index] = entry;
908
909 return true;
910 }
911
912 // Side-effects: populates the _local_interfaces field
913 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
914 const int itfs_len,
915 ConstantPool* const cp,
916 bool* const has_nonstatic_concrete_methods,
917 TRAPS) {
918 assert(stream != NULL, "invariant");
919 assert(cp != NULL, "invariant");
920 assert(has_nonstatic_concrete_methods != NULL, "invariant");
921
922 if (itfs_len == 0) {
923 _local_interfaces = Universe::the_empty_klass_array();
924 } else {
925 assert(itfs_len > 0, "only called for len>0");
926 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, itfs_len, NULL, CHECK);
927
928 int index;
929 for (index = 0; index < itfs_len; index++) {
930 const u2 interface_index = stream->get_u2(CHECK);
931 Klass* interf;
932 check_property(
933 valid_klass_reference_at(interface_index),
934 "Interface name has bad constant pool index %u in class file %s",
935 interface_index, CHECK);
936 if (cp->tag_at(interface_index).is_klass()) {
937 interf = cp->resolved_klass_at(interface_index);
938 } else {
939 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
940
941 // Don't need to check legal name because it's checked when parsing constant pool.
942 // But need to make sure it's not an array type.
943 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
944 "Bad interface name in class file %s", CHECK);
945
946 // Call resolve_super so classcircularity is checked
947 interf = SystemDictionary::resolve_super_or_fail(
948 _class_name,
949 unresolved_klass,
950 Handle(THREAD, _loader_data->class_loader()),
951 _protection_domain,
952 false,
953 CHECK);
954 }
955
956 if (!interf->is_interface()) {
957 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
958 err_msg("Class %s can not implement %s, because it is not an interface",
959 _class_name->as_klass_external_name(),
960 interf->class_loader_and_module_name()));
961 }
962
963 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
964 *has_nonstatic_concrete_methods = true;
965 }
966 _local_interfaces->at_put(index, interf);
967 }
968
969 if (!_need_verify || itfs_len <= 1) {
970 return;
971 }
972
973 // Check if there's any duplicates in interfaces
974 ResourceMark rm(THREAD);
975 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
976 NameSigHash*,
977 HASH_ROW_SIZE);
978 initialize_hashtable(interface_names);
979 bool dup = false;
980 const Symbol* name = NULL;
981 {
982 debug_only(NoSafepointVerifier nsv;)
983 for (index = 0; index < itfs_len; index++) {
984 const Klass* const k = _local_interfaces->at(index);
985 name = InstanceKlass::cast(k)->name();
986 // If no duplicates, add (name, NULL) in hashtable interface_names.
987 if (!put_after_lookup(name, NULL, interface_names)) {
988 dup = true;
989 break;
990 }
991 }
992 }
993 if (dup) {
994 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
995 name->as_C_string(), CHECK);
996 }
997 }
998 }
999
1000 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
1001 int constantvalue_index,
1002 int signature_index,
1003 TRAPS) const {
1004 // Make sure the constant pool entry is of a type appropriate to this field
1005 guarantee_property(
1006 (constantvalue_index > 0 &&
1007 constantvalue_index < cp->length()),
1008 "Bad initial value index %u in ConstantValue attribute in class file %s",
1009 constantvalue_index, CHECK);
1010
1011 const constantTag value_type = cp->tag_at(constantvalue_index);
1012 switch(cp->basic_type_for_signature_at(signature_index)) {
1013 case T_LONG: {
1014 guarantee_property(value_type.is_long(),
1015 "Inconsistent constant value type in class file %s",
1016 CHECK);
1017 break;
1018 }
1019 case T_FLOAT: {
1020 guarantee_property(value_type.is_float(),
1021 "Inconsistent constant value type in class file %s",
1022 CHECK);
1023 break;
1024 }
1025 case T_DOUBLE: {
1026 guarantee_property(value_type.is_double(),
1027 "Inconsistent constant value type in class file %s",
1028 CHECK);
1029 break;
1030 }
1031 case T_BYTE:
1032 case T_CHAR:
1033 case T_SHORT:
1034 case T_BOOLEAN:
1035 case T_INT: {
1036 guarantee_property(value_type.is_int(),
1037 "Inconsistent constant value type in class file %s",
1038 CHECK);
1039 break;
1040 }
1041 case T_OBJECT: {
1042 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1043 && value_type.is_string()),
1044 "Bad string initial value in class file %s",
1045 CHECK);
1046 break;
1047 }
1048 default: {
1049 classfile_parse_error("Unable to set initial value %u in class file %s",
1050 constantvalue_index,
1051 CHECK);
1052 }
1053 }
1054 }
1055
1056 class AnnotationCollector : public ResourceObj{
1057 public:
1058 enum Location { _in_field, _in_method, _in_class };
1059 enum ID {
1060 _unknown = 0,
1061 _method_CallerSensitive,
1062 _method_ForceInline,
1063 _method_DontInline,
1064 _method_InjectedProfile,
1065 _method_LambdaForm_Compiled,
1066 _method_LambdaForm_Hidden,
1067 _method_HotSpotIntrinsicCandidate,
1068 _jdk_internal_vm_annotation_Contended,
1069 _field_Stable,
1070 _jdk_internal_vm_annotation_ReservedStackAccess,
1071 _annotation_LIMIT
1072 };
1073 const Location _location;
1074 int _annotations_present;
1075 u2 _contended_group;
1076
1077 AnnotationCollector(Location location)
1078 : _location(location), _annotations_present(0)
1079 {
1080 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1081 }
1082 // If this annotation name has an ID, report it (or _none).
1083 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1084 // Set the annotation name:
1085 void set_annotation(ID id) {
1086 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1087 _annotations_present |= nth_bit((int)id);
1088 }
1089
1090 void remove_annotation(ID id) {
1091 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1092 _annotations_present &= ~nth_bit((int)id);
1093 }
1094
1095 // Report if the annotation is present.
1096 bool has_any_annotations() const { return _annotations_present != 0; }
1097 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1098
1099 void set_contended_group(u2 group) { _contended_group = group; }
1100 u2 contended_group() const { return _contended_group; }
1101
1102 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1103
1104 void set_stable(bool stable) { set_annotation(_field_Stable); }
1105 bool is_stable() const { return has_annotation(_field_Stable); }
1106 };
1107
1108 // This class also doubles as a holder for metadata cleanup.
1109 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1110 private:
1111 ClassLoaderData* _loader_data;
1112 AnnotationArray* _field_annotations;
1113 AnnotationArray* _field_type_annotations;
1114 public:
1115 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1116 AnnotationCollector(_in_field),
1117 _loader_data(loader_data),
1118 _field_annotations(NULL),
1119 _field_type_annotations(NULL) {}
1120 ~FieldAnnotationCollector();
1121 void apply_to(FieldInfo* f);
1122 AnnotationArray* field_annotations() { return _field_annotations; }
1123 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1124
1125 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1126 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1127 };
1128
1129 class MethodAnnotationCollector : public AnnotationCollector{
1130 public:
1131 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1132 void apply_to(const methodHandle& m);
1133 };
1134
1135 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1136 public:
1137 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1138 void apply_to(InstanceKlass* ik);
1139 };
1140
1141
1142 static int skip_annotation_value(const u1*, int, int); // fwd decl
1143
1144 // Safely increment index by val if does not pass limit
1145 #define SAFE_ADD(index, limit, val) \
1146 if (index >= limit - val) return limit; \
1147 index += val;
1148
1149 // Skip an annotation. Return >=limit if there is any problem.
1150 static int skip_annotation(const u1* buffer, int limit, int index) {
1151 assert(buffer != NULL, "invariant");
1152 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1153 // value := switch (tag:u1) { ... }
1154 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1155 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1156 while (--nmem >= 0 && index < limit) {
1157 SAFE_ADD(index, limit, 2); // skip member
1158 index = skip_annotation_value(buffer, limit, index);
1159 }
1160 return index;
1161 }
1162
1163 // Skip an annotation value. Return >=limit if there is any problem.
1164 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1165 assert(buffer != NULL, "invariant");
1166
1167 // value := switch (tag:u1) {
1168 // case B, C, I, S, Z, D, F, J, c: con:u2;
1169 // case e: e_class:u2 e_name:u2;
1170 // case s: s_con:u2;
1171 // case [: do(nval:u2) {value};
1172 // case @: annotation;
1173 // case s: s_con:u2;
1174 // }
1175 SAFE_ADD(index, limit, 1); // read tag
1176 const u1 tag = buffer[index - 1];
1177 switch (tag) {
1178 case 'B':
1179 case 'C':
1180 case 'I':
1181 case 'S':
1182 case 'Z':
1183 case 'D':
1184 case 'F':
1185 case 'J':
1186 case 'c':
1187 case 's':
1188 SAFE_ADD(index, limit, 2); // skip con or s_con
1189 break;
1190 case 'e':
1191 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1192 break;
1193 case '[':
1194 {
1195 SAFE_ADD(index, limit, 2); // read nval
1196 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1197 while (--nval >= 0 && index < limit) {
1198 index = skip_annotation_value(buffer, limit, index);
1199 }
1200 }
1201 break;
1202 case '@':
1203 index = skip_annotation(buffer, limit, index);
1204 break;
1205 default:
1206 return limit; // bad tag byte
1207 }
1208 return index;
1209 }
1210
1211 // Sift through annotations, looking for those significant to the VM:
1212 static void parse_annotations(const ConstantPool* const cp,
1213 const u1* buffer, int limit,
1214 AnnotationCollector* coll,
1215 ClassLoaderData* loader_data,
1216 TRAPS) {
1217
1218 assert(cp != NULL, "invariant");
1219 assert(buffer != NULL, "invariant");
1220 assert(coll != NULL, "invariant");
1221 assert(loader_data != NULL, "invariant");
1222
1223 // annotations := do(nann:u2) {annotation}
1224 int index = 2; // read nann
1225 if (index >= limit) return;
1226 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1227 enum { // initial annotation layout
1228 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1229 count_off = 2, // u2 such as 1 (one value)
1230 member_off = 4, // utf8 such as 'value'
1231 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1232 e_tag_val = 'e',
1233 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1234 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1235 e_size = 11, // end of 'e' annotation
1236 c_tag_val = 'c', // payload is type
1237 c_con_off = 7, // utf8 payload, such as 'I'
1238 c_size = 9, // end of 'c' annotation
1239 s_tag_val = 's', // payload is String
1240 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1241 s_size = 9,
1242 min_size = 6 // smallest possible size (zero members)
1243 };
1244 // Cannot add min_size to index in case of overflow MAX_INT
1245 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1246 int index0 = index;
1247 index = skip_annotation(buffer, limit, index);
1248 const u1* const abase = buffer + index0;
1249 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1250 const int count = Bytes::get_Java_u2((address)abase + count_off);
1251 const Symbol* const aname = check_symbol_at(cp, atype);
1252 if (aname == NULL) break; // invalid annotation name
1253 const Symbol* member = NULL;
1254 if (count >= 1) {
1255 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1256 member = check_symbol_at(cp, member_index);
1257 if (member == NULL) break; // invalid member name
1258 }
1259
1260 // Here is where parsing particular annotations will take place.
1261 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1262 if (AnnotationCollector::_unknown == id) continue;
1263 coll->set_annotation(id);
1264
1265 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1266 // @Contended can optionally specify the contention group.
1267 //
1268 // Contended group defines the equivalence class over the fields:
1269 // the fields within the same contended group are not treated distinct.
1270 // The only exception is default group, which does not incur the
1271 // equivalence. Naturally, contention group for classes is meaningless.
1272 //
1273 // While the contention group is specified as String, annotation
1274 // values are already interned, and we might as well use the constant
1275 // pool index as the group tag.
1276 //
1277 u2 group_index = 0; // default contended group
1278 if (count == 1
1279 && s_size == (index - index0) // match size
1280 && s_tag_val == *(abase + tag_off)
1281 && member == vmSymbols::value_name()) {
1282 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1283 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1284 group_index = 0; // default contended group
1285 }
1286 }
1287 coll->set_contended_group(group_index);
1288 }
1289 }
1290 }
1291
1292
1293 // Parse attributes for a field.
1294 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1295 u2 attributes_count,
1296 bool is_static, u2 signature_index,
1297 u2* const constantvalue_index_addr,
1298 bool* const is_synthetic_addr,
1299 u2* const generic_signature_index_addr,
1300 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1301 TRAPS) {
1302 assert(cfs != NULL, "invariant");
1303 assert(constantvalue_index_addr != NULL, "invariant");
1304 assert(is_synthetic_addr != NULL, "invariant");
1305 assert(generic_signature_index_addr != NULL, "invariant");
1306 assert(parsed_annotations != NULL, "invariant");
1307 assert(attributes_count > 0, "attributes_count should be greater than 0");
1308
1309 u2 constantvalue_index = 0;
1310 u2 generic_signature_index = 0;
1311 bool is_synthetic = false;
1312 const u1* runtime_visible_annotations = NULL;
1313 int runtime_visible_annotations_length = 0;
1314 const u1* runtime_invisible_annotations = NULL;
1315 int runtime_invisible_annotations_length = 0;
1316 const u1* runtime_visible_type_annotations = NULL;
1317 int runtime_visible_type_annotations_length = 0;
1318 const u1* runtime_invisible_type_annotations = NULL;
1319 int runtime_invisible_type_annotations_length = 0;
1320 bool runtime_invisible_annotations_exists = false;
1321 bool runtime_invisible_type_annotations_exists = false;
1322 const ConstantPool* const cp = _cp;
1323
1324 while (attributes_count--) {
1325 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1326 const u2 attribute_name_index = cfs->get_u2_fast();
1327 const u4 attribute_length = cfs->get_u4_fast();
1328 check_property(valid_symbol_at(attribute_name_index),
1329 "Invalid field attribute index %u in class file %s",
1330 attribute_name_index,
1331 CHECK);
1332
1333 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1334 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1335 // ignore if non-static
1336 if (constantvalue_index != 0) {
1337 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1338 }
1339 check_property(
1340 attribute_length == 2,
1341 "Invalid ConstantValue field attribute length %u in class file %s",
1342 attribute_length, CHECK);
1343
1344 constantvalue_index = cfs->get_u2(CHECK);
1345 if (_need_verify) {
1346 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1347 }
1348 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1349 if (attribute_length != 0) {
1350 classfile_parse_error(
1351 "Invalid Synthetic field attribute length %u in class file %s",
1352 attribute_length, CHECK);
1353 }
1354 is_synthetic = true;
1355 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1356 if (attribute_length != 0) {
1357 classfile_parse_error(
1358 "Invalid Deprecated field attribute length %u in class file %s",
1359 attribute_length, CHECK);
1360 }
1361 } else if (_major_version >= JAVA_1_5_VERSION) {
1362 if (attribute_name == vmSymbols::tag_signature()) {
1363 if (generic_signature_index != 0) {
1364 classfile_parse_error(
1365 "Multiple Signature attributes for field in class file %s", CHECK);
1366 }
1367 if (attribute_length != 2) {
1368 classfile_parse_error(
1369 "Wrong size %u for field's Signature attribute in class file %s",
1370 attribute_length, CHECK);
1371 }
1372 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1373 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1374 if (runtime_visible_annotations != NULL) {
1375 classfile_parse_error(
1376 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1377 }
1378 runtime_visible_annotations_length = attribute_length;
1379 runtime_visible_annotations = cfs->current();
1380 assert(runtime_visible_annotations != NULL, "null visible annotations");
1381 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1382 parse_annotations(cp,
1383 runtime_visible_annotations,
1384 runtime_visible_annotations_length,
1385 parsed_annotations,
1386 _loader_data,
1387 CHECK);
1388 cfs->skip_u1_fast(runtime_visible_annotations_length);
1389 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1390 if (runtime_invisible_annotations_exists) {
1391 classfile_parse_error(
1392 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1393 }
1394 runtime_invisible_annotations_exists = true;
1395 if (PreserveAllAnnotations) {
1396 runtime_invisible_annotations_length = attribute_length;
1397 runtime_invisible_annotations = cfs->current();
1398 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1399 }
1400 cfs->skip_u1(attribute_length, CHECK);
1401 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1402 if (runtime_visible_type_annotations != NULL) {
1403 classfile_parse_error(
1404 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1405 }
1406 runtime_visible_type_annotations_length = attribute_length;
1407 runtime_visible_type_annotations = cfs->current();
1408 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1409 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1410 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1411 if (runtime_invisible_type_annotations_exists) {
1412 classfile_parse_error(
1413 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1414 } else {
1415 runtime_invisible_type_annotations_exists = true;
1416 }
1417 if (PreserveAllAnnotations) {
1418 runtime_invisible_type_annotations_length = attribute_length;
1419 runtime_invisible_type_annotations = cfs->current();
1420 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1421 }
1422 cfs->skip_u1(attribute_length, CHECK);
1423 } else {
1424 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1425 }
1426 } else {
1427 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1428 }
1429 }
1430
1431 *constantvalue_index_addr = constantvalue_index;
1432 *is_synthetic_addr = is_synthetic;
1433 *generic_signature_index_addr = generic_signature_index;
1434 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1435 runtime_visible_annotations_length,
1436 runtime_invisible_annotations,
1437 runtime_invisible_annotations_length,
1438 CHECK);
1439 parsed_annotations->set_field_annotations(a);
1440 a = assemble_annotations(runtime_visible_type_annotations,
1441 runtime_visible_type_annotations_length,
1442 runtime_invisible_type_annotations,
1443 runtime_invisible_type_annotations_length,
1444 CHECK);
1445 parsed_annotations->set_field_type_annotations(a);
1446 return;
1447 }
1448
1449
1450 // Field allocation types. Used for computing field offsets.
1451
1452 enum FieldAllocationType {
1453 STATIC_OOP, // Oops
1454 STATIC_BYTE, // Boolean, Byte, char
1455 STATIC_SHORT, // shorts
1456 STATIC_WORD, // ints
1457 STATIC_DOUBLE, // aligned long or double
1458 NONSTATIC_OOP,
1459 NONSTATIC_BYTE,
1460 NONSTATIC_SHORT,
1461 NONSTATIC_WORD,
1462 NONSTATIC_DOUBLE,
1463 MAX_FIELD_ALLOCATION_TYPE,
1464 BAD_ALLOCATION_TYPE = -1
1465 };
1466
1467 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1468 BAD_ALLOCATION_TYPE, // 0
1469 BAD_ALLOCATION_TYPE, // 1
1470 BAD_ALLOCATION_TYPE, // 2
1471 BAD_ALLOCATION_TYPE, // 3
1472 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1473 NONSTATIC_SHORT, // T_CHAR = 5,
1474 NONSTATIC_WORD, // T_FLOAT = 6,
1475 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1476 NONSTATIC_BYTE, // T_BYTE = 8,
1477 NONSTATIC_SHORT, // T_SHORT = 9,
1478 NONSTATIC_WORD, // T_INT = 10,
1479 NONSTATIC_DOUBLE, // T_LONG = 11,
1480 NONSTATIC_OOP, // T_OBJECT = 12,
1481 NONSTATIC_OOP, // T_ARRAY = 13,
1482 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1483 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1484 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1485 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1486 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1487 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1488 BAD_ALLOCATION_TYPE, // 0
1489 BAD_ALLOCATION_TYPE, // 1
1490 BAD_ALLOCATION_TYPE, // 2
1491 BAD_ALLOCATION_TYPE, // 3
1492 STATIC_BYTE , // T_BOOLEAN = 4,
1493 STATIC_SHORT, // T_CHAR = 5,
1494 STATIC_WORD, // T_FLOAT = 6,
1495 STATIC_DOUBLE, // T_DOUBLE = 7,
1496 STATIC_BYTE, // T_BYTE = 8,
1497 STATIC_SHORT, // T_SHORT = 9,
1498 STATIC_WORD, // T_INT = 10,
1499 STATIC_DOUBLE, // T_LONG = 11,
1500 STATIC_OOP, // T_OBJECT = 12,
1501 STATIC_OOP, // T_ARRAY = 13,
1502 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1503 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1504 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1505 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1506 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1507 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1508 };
1509
1510 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1511 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1512 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1513 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1514 return result;
1515 }
1516
1517 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1518 public:
1519 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1520
1521 FieldAllocationCount() {
1522 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1523 count[i] = 0;
1524 }
1525 }
1526
1527 FieldAllocationType update(bool is_static, BasicType type) {
1528 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1529 if (atype != BAD_ALLOCATION_TYPE) {
1530 // Make sure there is no overflow with injected fields.
1531 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1532 count[atype]++;
1533 }
1534 return atype;
1535 }
1536 };
1537
1538 // Side-effects: populates the _fields, _fields_annotations,
1539 // _fields_type_annotations fields
1540 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1541 bool is_interface,
1542 FieldAllocationCount* const fac,
1543 ConstantPool* cp,
1544 const int cp_size,
1545 u2* const java_fields_count_ptr,
1546 TRAPS) {
1547
1548 assert(cfs != NULL, "invariant");
1549 assert(fac != NULL, "invariant");
1550 assert(cp != NULL, "invariant");
1551 assert(java_fields_count_ptr != NULL, "invariant");
1552
1553 assert(NULL == _fields, "invariant");
1554 assert(NULL == _fields_annotations, "invariant");
1555 assert(NULL == _fields_type_annotations, "invariant");
1556
1557 cfs->guarantee_more(2, CHECK); // length
1558 const u2 length = cfs->get_u2_fast();
1559 *java_fields_count_ptr = length;
1560
1561 int num_injected = 0;
1562 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1563 &num_injected);
1564 const int total_fields = length + num_injected;
1565
1566 // The field array starts with tuples of shorts
1567 // [access, name index, sig index, initial value index, byte offset].
1568 // A generic signature slot only exists for field with generic
1569 // signature attribute. And the access flag is set with
1570 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1571 // signature slots are at the end of the field array and after all
1572 // other fields data.
1573 //
1574 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1575 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1576 // ...
1577 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1578 // [generic signature index]
1579 // [generic signature index]
1580 // ...
1581 //
1582 // Allocate a temporary resource array for field data. For each field,
1583 // a slot is reserved in the temporary array for the generic signature
1584 // index. After parsing all fields, the data are copied to a permanent
1585 // array and any unused slots will be discarded.
1586 ResourceMark rm(THREAD);
1587 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1588 u2,
1589 total_fields * (FieldInfo::field_slots + 1));
1590
1591 // The generic signature slots start after all other fields' data.
1592 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1593 int num_generic_signature = 0;
1594 for (int n = 0; n < length; n++) {
1595 // access_flags, name_index, descriptor_index, attributes_count
1596 cfs->guarantee_more(8, CHECK);
1597
1598 AccessFlags access_flags;
1599 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1600 verify_legal_field_modifiers(flags, is_interface, CHECK);
1601 access_flags.set_flags(flags);
1602
1603 const u2 name_index = cfs->get_u2_fast();
1604 check_property(valid_symbol_at(name_index),
1605 "Invalid constant pool index %u for field name in class file %s",
1606 name_index, CHECK);
1607 const Symbol* const name = cp->symbol_at(name_index);
1608 verify_legal_field_name(name, CHECK);
1609
1610 const u2 signature_index = cfs->get_u2_fast();
1611 check_property(valid_symbol_at(signature_index),
1612 "Invalid constant pool index %u for field signature in class file %s",
1613 signature_index, CHECK);
1614 const Symbol* const sig = cp->symbol_at(signature_index);
1615 verify_legal_field_signature(name, sig, CHECK);
1616
1617 u2 constantvalue_index = 0;
1618 bool is_synthetic = false;
1619 u2 generic_signature_index = 0;
1620 const bool is_static = access_flags.is_static();
1621 FieldAnnotationCollector parsed_annotations(_loader_data);
1622
1623 const u2 attributes_count = cfs->get_u2_fast();
1624 if (attributes_count > 0) {
1625 parse_field_attributes(cfs,
1626 attributes_count,
1627 is_static,
1628 signature_index,
1629 &constantvalue_index,
1630 &is_synthetic,
1631 &generic_signature_index,
1632 &parsed_annotations,
1633 CHECK);
1634
1635 if (parsed_annotations.field_annotations() != NULL) {
1636 if (_fields_annotations == NULL) {
1637 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1638 _loader_data, length, NULL,
1639 CHECK);
1640 }
1641 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1642 parsed_annotations.set_field_annotations(NULL);
1643 }
1644 if (parsed_annotations.field_type_annotations() != NULL) {
1645 if (_fields_type_annotations == NULL) {
1646 _fields_type_annotations =
1647 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1648 length,
1649 NULL,
1650 CHECK);
1651 }
1652 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1653 parsed_annotations.set_field_type_annotations(NULL);
1654 }
1655
1656 if (is_synthetic) {
1657 access_flags.set_is_synthetic();
1658 }
1659 if (generic_signature_index != 0) {
1660 access_flags.set_field_has_generic_signature();
1661 fa[generic_signature_slot] = generic_signature_index;
1662 generic_signature_slot ++;
1663 num_generic_signature ++;
1664 }
1665 }
1666
1667 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1668 field->initialize(access_flags.as_short(),
1669 name_index,
1670 signature_index,
1671 constantvalue_index);
1672 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1673
1674 // Remember how many oops we encountered and compute allocation type
1675 const FieldAllocationType atype = fac->update(is_static, type);
1676 field->set_allocation_type(atype);
1677
1678 // After field is initialized with type, we can augment it with aux info
1679 if (parsed_annotations.has_any_annotations())
1680 parsed_annotations.apply_to(field);
1681 }
1682
1683 int index = length;
1684 if (num_injected != 0) {
1685 for (int n = 0; n < num_injected; n++) {
1686 // Check for duplicates
1687 if (injected[n].may_be_java) {
1688 const Symbol* const name = injected[n].name();
1689 const Symbol* const signature = injected[n].signature();
1690 bool duplicate = false;
1691 for (int i = 0; i < length; i++) {
1692 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1693 if (name == cp->symbol_at(f->name_index()) &&
1694 signature == cp->symbol_at(f->signature_index())) {
1695 // Symbol is desclared in Java so skip this one
1696 duplicate = true;
1697 break;
1698 }
1699 }
1700 if (duplicate) {
1701 // These will be removed from the field array at the end
1702 continue;
1703 }
1704 }
1705
1706 // Injected field
1707 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1708 field->initialize(JVM_ACC_FIELD_INTERNAL,
1709 injected[n].name_index,
1710 injected[n].signature_index,
1711 0);
1712
1713 const BasicType type = FieldType::basic_type(injected[n].signature());
1714
1715 // Remember how many oops we encountered and compute allocation type
1716 const FieldAllocationType atype = fac->update(false, type);
1717 field->set_allocation_type(atype);
1718 index++;
1719 }
1720 }
1721
1722 assert(NULL == _fields, "invariant");
1723
1724 _fields =
1725 MetadataFactory::new_array<u2>(_loader_data,
1726 index * FieldInfo::field_slots + num_generic_signature,
1727 CHECK);
1728 // Sometimes injected fields already exist in the Java source so
1729 // the fields array could be too long. In that case the
1730 // fields array is trimed. Also unused slots that were reserved
1731 // for generic signature indexes are discarded.
1732 {
1733 int i = 0;
1734 for (; i < index * FieldInfo::field_slots; i++) {
1735 _fields->at_put(i, fa[i]);
1736 }
1737 for (int j = total_fields * FieldInfo::field_slots;
1738 j < generic_signature_slot; j++) {
1739 _fields->at_put(i++, fa[j]);
1740 }
1741 assert(_fields->length() == i, "");
1742 }
1743
1744 if (_need_verify && length > 1) {
1745 // Check duplicated fields
1746 ResourceMark rm(THREAD);
1747 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1748 THREAD, NameSigHash*, HASH_ROW_SIZE);
1749 initialize_hashtable(names_and_sigs);
1750 bool dup = false;
1751 const Symbol* name = NULL;
1752 const Symbol* sig = NULL;
1753 {
1754 debug_only(NoSafepointVerifier nsv;)
1755 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1756 name = fs.name();
1757 sig = fs.signature();
1758 // If no duplicates, add name/signature in hashtable names_and_sigs.
1759 if (!put_after_lookup(name, sig, names_and_sigs)) {
1760 dup = true;
1761 break;
1762 }
1763 }
1764 }
1765 if (dup) {
1766 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1767 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1768 }
1769 }
1770 }
1771
1772
1773 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1774 u4 code_length,
1775 u4 exception_table_length,
1776 TRAPS) {
1777 assert(cfs != NULL, "invariant");
1778
1779 const unsafe_u2* const exception_table_start = cfs->current();
1780 assert(exception_table_start != NULL, "null exception table");
1781
1782 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1783 // end_pc,
1784 // handler_pc,
1785 // catch_type_index
1786
1787 // Will check legal target after parsing code array in verifier.
1788 if (_need_verify) {
1789 for (unsigned int i = 0; i < exception_table_length; i++) {
1790 const u2 start_pc = cfs->get_u2_fast();
1791 const u2 end_pc = cfs->get_u2_fast();
1792 const u2 handler_pc = cfs->get_u2_fast();
1793 const u2 catch_type_index = cfs->get_u2_fast();
1794 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1795 "Illegal exception table range in class file %s",
1796 CHECK_NULL);
1797 guarantee_property(handler_pc < code_length,
1798 "Illegal exception table handler in class file %s",
1799 CHECK_NULL);
1800 if (catch_type_index != 0) {
1801 guarantee_property(valid_klass_reference_at(catch_type_index),
1802 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1803 }
1804 }
1805 } else {
1806 cfs->skip_u2_fast(exception_table_length * 4);
1807 }
1808 return exception_table_start;
1809 }
1810
1811 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1812 u4 code_length,
1813 CompressedLineNumberWriteStream**const write_stream,
1814 TRAPS) {
1815
1816 const ClassFileStream* const cfs = _stream;
1817 unsigned int num_entries = cfs->get_u2(CHECK);
1818
1819 // Each entry is a u2 start_pc, and a u2 line_number
1820 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1821
1822 // Verify line number attribute and table length
1823 check_property(
1824 code_attribute_length == sizeof(u2) + length_in_bytes,
1825 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1826
1827 cfs->guarantee_more(length_in_bytes, CHECK);
1828
1829 if ((*write_stream) == NULL) {
1830 if (length_in_bytes > fixed_buffer_size) {
1831 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1832 } else {
1833 (*write_stream) = new CompressedLineNumberWriteStream(
1834 _linenumbertable_buffer, fixed_buffer_size);
1835 }
1836 }
1837
1838 while (num_entries-- > 0) {
1839 const u2 bci = cfs->get_u2_fast(); // start_pc
1840 const u2 line = cfs->get_u2_fast(); // line_number
1841 guarantee_property(bci < code_length,
1842 "Invalid pc in LineNumberTable in class file %s", CHECK);
1843 (*write_stream)->write_pair(bci, line);
1844 }
1845 }
1846
1847
1848 class LVT_Hash : public AllStatic {
1849 public:
1850
1851 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1852 /*
1853 * 3-tuple start_bci/length/slot has to be unique key,
1854 * so the following comparison seems to be redundant:
1855 * && elem->name_cp_index == entry->_elem->name_cp_index
1856 */
1857 return (e0.start_bci == e1.start_bci &&
1858 e0.length == e1.length &&
1859 e0.name_cp_index == e1.name_cp_index &&
1860 e0.slot == e1.slot);
1861 }
1862
1863 static unsigned int hash(LocalVariableTableElement const& e0) {
1864 unsigned int raw_hash = e0.start_bci;
1865
1866 raw_hash = e0.length + raw_hash * 37;
1867 raw_hash = e0.name_cp_index + raw_hash * 37;
1868 raw_hash = e0.slot + raw_hash * 37;
1869
1870 return raw_hash;
1871 }
1872 };
1873
1874
1875 // Class file LocalVariableTable elements.
1876 class Classfile_LVT_Element {
1877 public:
1878 u2 start_bci;
1879 u2 length;
1880 u2 name_cp_index;
1881 u2 descriptor_cp_index;
1882 u2 slot;
1883 };
1884
1885 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1886 LocalVariableTableElement* const lvt) {
1887 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1888 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1889 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1890 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1891 lvt->signature_cp_index = 0;
1892 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1893 }
1894
1895 // Function is used to parse both attributes:
1896 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1897 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1898 u4 code_length,
1899 u2 max_locals,
1900 u4 code_attribute_length,
1901 u2* const localvariable_table_length,
1902 bool isLVTT,
1903 TRAPS) {
1904 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1905 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1906 const unsigned int size =
1907 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1908
1909 const ConstantPool* const cp = _cp;
1910
1911 // Verify local variable table attribute has right length
1912 if (_need_verify) {
1913 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1914 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1915 }
1916
1917 const unsafe_u2* const localvariable_table_start = cfs->current();
1918 assert(localvariable_table_start != NULL, "null local variable table");
1919 if (!_need_verify) {
1920 cfs->skip_u2_fast(size);
1921 } else {
1922 cfs->guarantee_more(size * 2, CHECK_NULL);
1923 for(int i = 0; i < (*localvariable_table_length); i++) {
1924 const u2 start_pc = cfs->get_u2_fast();
1925 const u2 length = cfs->get_u2_fast();
1926 const u2 name_index = cfs->get_u2_fast();
1927 const u2 descriptor_index = cfs->get_u2_fast();
1928 const u2 index = cfs->get_u2_fast();
1929 // Assign to a u4 to avoid overflow
1930 const u4 end_pc = (u4)start_pc + (u4)length;
1931
1932 if (start_pc >= code_length) {
1933 classfile_parse_error(
1934 "Invalid start_pc %u in %s in class file %s",
1935 start_pc, tbl_name, CHECK_NULL);
1936 }
1937 if (end_pc > code_length) {
1938 classfile_parse_error(
1939 "Invalid length %u in %s in class file %s",
1940 length, tbl_name, CHECK_NULL);
1941 }
1942 const int cp_size = cp->length();
1943 guarantee_property(valid_symbol_at(name_index),
1944 "Name index %u in %s has bad constant type in class file %s",
1945 name_index, tbl_name, CHECK_NULL);
1946 guarantee_property(valid_symbol_at(descriptor_index),
1947 "Signature index %u in %s has bad constant type in class file %s",
1948 descriptor_index, tbl_name, CHECK_NULL);
1949
1950 const Symbol* const name = cp->symbol_at(name_index);
1951 const Symbol* const sig = cp->symbol_at(descriptor_index);
1952 verify_legal_field_name(name, CHECK_NULL);
1953 u2 extra_slot = 0;
1954 if (!isLVTT) {
1955 verify_legal_field_signature(name, sig, CHECK_NULL);
1956
1957 // 4894874: check special cases for double and long local variables
1958 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1959 sig == vmSymbols::type_signature(T_LONG)) {
1960 extra_slot = 1;
1961 }
1962 }
1963 guarantee_property((index + extra_slot) < max_locals,
1964 "Invalid index %u in %s in class file %s",
1965 index, tbl_name, CHECK_NULL);
1966 }
1967 }
1968 return localvariable_table_start;
1969 }
1970
1971
1972 void ClassFileParser::parse_type_array(u2 array_length,
1973 u4 code_length,
1974 u4* const u1_index,
1975 u4* const u2_index,
1976 u1* const u1_array,
1977 u2* const u2_array,
1978 TRAPS) {
1979 const ClassFileStream* const cfs = _stream;
1980 u2 index = 0; // index in the array with long/double occupying two slots
1981 u4 i1 = *u1_index;
1982 u4 i2 = *u2_index + 1;
1983 for(int i = 0; i < array_length; i++) {
1984 const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1985 index++;
1986 if (tag == ITEM_Long || tag == ITEM_Double) {
1987 index++;
1988 } else if (tag == ITEM_Object) {
1989 const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1990 guarantee_property(valid_klass_reference_at(class_index),
1991 "Bad class index %u in StackMap in class file %s",
1992 class_index, CHECK);
1993 } else if (tag == ITEM_Uninitialized) {
1994 const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1995 guarantee_property(
1996 offset < code_length,
1997 "Bad uninitialized type offset %u in StackMap in class file %s",
1998 offset, CHECK);
1999 } else {
2000 guarantee_property(
2001 tag <= (u1)ITEM_Uninitialized,
2002 "Unknown variable type %u in StackMap in class file %s",
2003 tag, CHECK);
2004 }
2005 }
2006 u2_array[*u2_index] = index;
2007 *u1_index = i1;
2008 *u2_index = i2;
2009 }
2010
2011 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
2012 u4 code_attribute_length,
2013 bool need_verify,
2014 TRAPS) {
2015 assert(cfs != NULL, "invariant");
2016
2017 if (0 == code_attribute_length) {
2018 return NULL;
2019 }
2020
2021 const u1* const stackmap_table_start = cfs->current();
2022 assert(stackmap_table_start != NULL, "null stackmap table");
2023
2024 // check code_attribute_length first
2025 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2026
2027 if (!need_verify && !DumpSharedSpaces) {
2028 return NULL;
2029 }
2030 return stackmap_table_start;
2031 }
2032
2033 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2034 u2* const checked_exceptions_length,
2035 u4 method_attribute_length,
2036 TRAPS) {
2037 assert(cfs != NULL, "invariant");
2038 assert(checked_exceptions_length != NULL, "invariant");
2039
2040 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2041 *checked_exceptions_length = cfs->get_u2_fast();
2042 const unsigned int size =
2043 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2044 const unsafe_u2* const checked_exceptions_start = cfs->current();
2045 assert(checked_exceptions_start != NULL, "null checked exceptions");
2046 if (!_need_verify) {
2047 cfs->skip_u2_fast(size);
2048 } else {
2049 // Verify each value in the checked exception table
2050 u2 checked_exception;
2051 const u2 len = *checked_exceptions_length;
2052 cfs->guarantee_more(2 * len, CHECK_NULL);
2053 for (int i = 0; i < len; i++) {
2054 checked_exception = cfs->get_u2_fast();
2055 check_property(
2056 valid_klass_reference_at(checked_exception),
2057 "Exception name has bad type at constant pool %u in class file %s",
2058 checked_exception, CHECK_NULL);
2059 }
2060 }
2061 // check exceptions attribute length
2062 if (_need_verify) {
2063 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2064 sizeof(u2) * size),
2065 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2066 }
2067 return checked_exceptions_start;
2068 }
2069
2070 void ClassFileParser::throwIllegalSignature(const char* type,
2071 const Symbol* name,
2072 const Symbol* sig,
2073 TRAPS) const {
2074 assert(name != NULL, "invariant");
2075 assert(sig != NULL, "invariant");
2076
2077 ResourceMark rm(THREAD);
2078 Exceptions::fthrow(THREAD_AND_LOCATION,
2079 vmSymbols::java_lang_ClassFormatError(),
2080 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2081 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2082 }
2083
2084 AnnotationCollector::ID
2085 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2086 const Symbol* name) {
2087 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2088 // Privileged code can use all annotations. Other code silently drops some.
2089 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2090 loader_data->is_platform_class_loader_data() ||
2091 loader_data->is_anonymous();
2092 switch (sid) {
2093 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2094 if (_location != _in_method) break; // only allow for methods
2095 if (!privileged) break; // only allow in privileged code
2096 return _method_CallerSensitive;
2097 }
2098 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2099 if (_location != _in_method) break; // only allow for methods
2100 if (!privileged) break; // only allow in privileged code
2101 return _method_ForceInline;
2102 }
2103 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2104 if (_location != _in_method) break; // only allow for methods
2105 if (!privileged) break; // only allow in privileged code
2106 return _method_DontInline;
2107 }
2108 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2109 if (_location != _in_method) break; // only allow for methods
2110 if (!privileged) break; // only allow in privileged code
2111 return _method_InjectedProfile;
2112 }
2113 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2114 if (_location != _in_method) break; // only allow for methods
2115 if (!privileged) break; // only allow in privileged code
2116 return _method_LambdaForm_Compiled;
2117 }
2118 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): {
2119 if (_location != _in_method) break; // only allow for methods
2120 if (!privileged) break; // only allow in privileged code
2121 return _method_LambdaForm_Hidden;
2122 }
2123 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2124 if (_location != _in_method) break; // only allow for methods
2125 if (!privileged) break; // only allow in privileged code
2126 return _method_HotSpotIntrinsicCandidate;
2127 }
2128 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2129 if (_location != _in_field) break; // only allow for fields
2130 if (!privileged) break; // only allow in privileged code
2131 return _field_Stable;
2132 }
2133 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2134 if (_location != _in_field && _location != _in_class) {
2135 break; // only allow for fields and classes
2136 }
2137 if (!EnableContended || (RestrictContended && !privileged)) {
2138 break; // honor privileges
2139 }
2140 return _jdk_internal_vm_annotation_Contended;
2141 }
2142 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2143 if (_location != _in_method) break; // only allow for methods
2144 if (RestrictReservedStack && !privileged) break; // honor privileges
2145 return _jdk_internal_vm_annotation_ReservedStackAccess;
2146 }
2147 default: {
2148 break;
2149 }
2150 }
2151 return AnnotationCollector::_unknown;
2152 }
2153
2154 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2155 if (is_contended())
2156 f->set_contended_group(contended_group());
2157 if (is_stable())
2158 f->set_stable(true);
2159 }
2160
2161 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2162 // If there's an error deallocate metadata for field annotations
2163 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2164 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2165 }
2166
2167 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2168 if (has_annotation(_method_CallerSensitive))
2169 m->set_caller_sensitive(true);
2170 if (has_annotation(_method_ForceInline))
2171 m->set_force_inline(true);
2172 if (has_annotation(_method_DontInline))
2173 m->set_dont_inline(true);
2174 if (has_annotation(_method_InjectedProfile))
2175 m->set_has_injected_profile(true);
2176 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2177 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2178 if (has_annotation(_method_LambdaForm_Hidden))
2179 m->set_hidden(true);
2180 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2181 m->set_intrinsic_candidate(true);
2182 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2183 m->set_has_reserved_stack_access(true);
2184 }
2185
2186 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2187 assert(ik != NULL, "invariant");
2188 ik->set_is_contended(is_contended());
2189 }
2190
2191 #define MAX_ARGS_SIZE 255
2192 #define MAX_CODE_SIZE 65535
2193 #define INITIAL_MAX_LVT_NUMBER 256
2194
2195 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2196 *
2197 * Rules for LVT's and LVTT's are:
2198 * - There can be any number of LVT's and LVTT's.
2199 * - If there are n LVT's, it is the same as if there was just
2200 * one LVT containing all the entries from the n LVT's.
2201 * - There may be no more than one LVT entry per local variable.
2202 * Two LVT entries are 'equal' if these fields are the same:
2203 * start_pc, length, name, slot
2204 * - There may be no more than one LVTT entry per each LVT entry.
2205 * Each LVTT entry has to match some LVT entry.
2206 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2207 */
2208 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2209 int lvt_cnt,
2210 u2* const localvariable_table_length,
2211 const unsafe_u2** const localvariable_table_start,
2212 int lvtt_cnt,
2213 u2* const localvariable_type_table_length,
2214 const unsafe_u2** const localvariable_type_table_start,
2215 TRAPS) {
2216
2217 ResourceMark rm(THREAD);
2218
2219 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2220 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2221
2222 LVT_HashTable* const table = new LVT_HashTable();
2223
2224 // To fill LocalVariableTable in
2225 const Classfile_LVT_Element* cf_lvt;
2226 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2227
2228 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2229 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2230 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2231 copy_lvt_element(&cf_lvt[idx], lvt);
2232 // If no duplicates, add LVT elem in hashtable.
2233 if (table->put(*lvt, lvt) == false
2234 && _need_verify
2235 && _major_version >= JAVA_1_5_VERSION) {
2236 classfile_parse_error("Duplicated LocalVariableTable attribute "
2237 "entry for '%s' in class file %s",
2238 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2239 CHECK);
2240 }
2241 }
2242 }
2243
2244 // To merge LocalVariableTable and LocalVariableTypeTable
2245 const Classfile_LVT_Element* cf_lvtt;
2246 LocalVariableTableElement lvtt_elem;
2247
2248 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2249 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2250 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2251 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2252 LocalVariableTableElement** entry = table->get(lvtt_elem);
2253 if (entry == NULL) {
2254 if (_need_verify) {
2255 classfile_parse_error("LVTT entry for '%s' in class file %s "
2256 "does not match any LVT entry",
2257 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2258 CHECK);
2259 }
2260 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2261 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2262 "entry for '%s' in class file %s",
2263 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2264 CHECK);
2265 } else {
2266 // to add generic signatures into LocalVariableTable
2267 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2268 }
2269 }
2270 }
2271 }
2272
2273
2274 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2275 const u1* runtime_visible_annotations,
2276 int runtime_visible_annotations_length,
2277 const u1* runtime_invisible_annotations,
2278 int runtime_invisible_annotations_length,
2279 const u1* runtime_visible_parameter_annotations,
2280 int runtime_visible_parameter_annotations_length,
2281 const u1* runtime_invisible_parameter_annotations,
2282 int runtime_invisible_parameter_annotations_length,
2283 const u1* runtime_visible_type_annotations,
2284 int runtime_visible_type_annotations_length,
2285 const u1* runtime_invisible_type_annotations,
2286 int runtime_invisible_type_annotations_length,
2287 const u1* annotation_default,
2288 int annotation_default_length,
2289 TRAPS) {
2290
2291 AnnotationArray* a;
2292
2293 if (runtime_visible_annotations_length +
2294 runtime_invisible_annotations_length > 0) {
2295 a = assemble_annotations(runtime_visible_annotations,
2296 runtime_visible_annotations_length,
2297 runtime_invisible_annotations,
2298 runtime_invisible_annotations_length,
2299 CHECK);
2300 cm->set_method_annotations(a);
2301 }
2302
2303 if (runtime_visible_parameter_annotations_length +
2304 runtime_invisible_parameter_annotations_length > 0) {
2305 a = assemble_annotations(runtime_visible_parameter_annotations,
2306 runtime_visible_parameter_annotations_length,
2307 runtime_invisible_parameter_annotations,
2308 runtime_invisible_parameter_annotations_length,
2309 CHECK);
2310 cm->set_parameter_annotations(a);
2311 }
2312
2313 if (annotation_default_length > 0) {
2314 a = assemble_annotations(annotation_default,
2315 annotation_default_length,
2316 NULL,
2317 0,
2318 CHECK);
2319 cm->set_default_annotations(a);
2320 }
2321
2322 if (runtime_visible_type_annotations_length +
2323 runtime_invisible_type_annotations_length > 0) {
2324 a = assemble_annotations(runtime_visible_type_annotations,
2325 runtime_visible_type_annotations_length,
2326 runtime_invisible_type_annotations,
2327 runtime_invisible_type_annotations_length,
2328 CHECK);
2329 cm->set_type_annotations(a);
2330 }
2331 }
2332
2333
2334 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2335 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2336 // Method* to save footprint, so we only know the size of the resulting Method* when the
2337 // entire method attribute is parsed.
2338 //
2339 // The promoted_flags parameter is used to pass relevant access_flags
2340 // from the method back up to the containing klass. These flag values
2341 // are added to klass's access_flags.
2342
2343 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2344 bool is_interface,
2345 const ConstantPool* cp,
2346 AccessFlags* const promoted_flags,
2347 TRAPS) {
2348 assert(cfs != NULL, "invariant");
2349 assert(cp != NULL, "invariant");
2350 assert(promoted_flags != NULL, "invariant");
2351
2352 ResourceMark rm(THREAD);
2353 // Parse fixed parts:
2354 // access_flags, name_index, descriptor_index, attributes_count
2355 cfs->guarantee_more(8, CHECK_NULL);
2356
2357 int flags = cfs->get_u2_fast();
2358 const u2 name_index = cfs->get_u2_fast();
2359 const int cp_size = cp->length();
2360 check_property(
2361 valid_symbol_at(name_index),
2362 "Illegal constant pool index %u for method name in class file %s",
2363 name_index, CHECK_NULL);
2364 const Symbol* const name = cp->symbol_at(name_index);
2365 verify_legal_method_name(name, CHECK_NULL);
2366
2367 const u2 signature_index = cfs->get_u2_fast();
2368 guarantee_property(
2369 valid_symbol_at(signature_index),
2370 "Illegal constant pool index %u for method signature in class file %s",
2371 signature_index, CHECK_NULL);
2372 const Symbol* const signature = cp->symbol_at(signature_index);
2373
2374 if (name == vmSymbols::class_initializer_name()) {
2375 // We ignore the other access flags for a valid class initializer.
2376 // (JVM Spec 2nd ed., chapter 4.6)
2377 if (_major_version < 51) { // backward compatibility
2378 flags = JVM_ACC_STATIC;
2379 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2380 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2381 } else {
2382 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2383 }
2384 } else {
2385 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2386 }
2387
2388 if (name == vmSymbols::object_initializer_name() && is_interface) {
2389 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2390 }
2391
2392 int args_size = -1; // only used when _need_verify is true
2393 if (_need_verify) {
2394 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2395 verify_legal_method_signature(name, signature, CHECK_NULL);
2396 if (args_size > MAX_ARGS_SIZE) {
2397 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2398 }
2399 }
2400
2401 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2402
2403 // Default values for code and exceptions attribute elements
2404 u2 max_stack = 0;
2405 u2 max_locals = 0;
2406 u4 code_length = 0;
2407 const u1* code_start = 0;
2408 u2 exception_table_length = 0;
2409 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2410 Array<int>* exception_handlers = Universe::the_empty_int_array();
2411 u2 checked_exceptions_length = 0;
2412 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2413 CompressedLineNumberWriteStream* linenumber_table = NULL;
2414 int linenumber_table_length = 0;
2415 int total_lvt_length = 0;
2416 u2 lvt_cnt = 0;
2417 u2 lvtt_cnt = 0;
2418 bool lvt_allocated = false;
2419 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2420 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2421 u2* localvariable_table_length = NULL;
2422 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2423 u2* localvariable_type_table_length = NULL;
2424 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2425 int method_parameters_length = -1;
2426 const u1* method_parameters_data = NULL;
2427 bool method_parameters_seen = false;
2428 bool parsed_code_attribute = false;
2429 bool parsed_checked_exceptions_attribute = false;
2430 bool parsed_stackmap_attribute = false;
2431 // stackmap attribute - JDK1.5
2432 const u1* stackmap_data = NULL;
2433 int stackmap_data_length = 0;
2434 u2 generic_signature_index = 0;
2435 MethodAnnotationCollector parsed_annotations;
2436 const u1* runtime_visible_annotations = NULL;
2437 int runtime_visible_annotations_length = 0;
2438 const u1* runtime_invisible_annotations = NULL;
2439 int runtime_invisible_annotations_length = 0;
2440 const u1* runtime_visible_parameter_annotations = NULL;
2441 int runtime_visible_parameter_annotations_length = 0;
2442 const u1* runtime_invisible_parameter_annotations = NULL;
2443 int runtime_invisible_parameter_annotations_length = 0;
2444 const u1* runtime_visible_type_annotations = NULL;
2445 int runtime_visible_type_annotations_length = 0;
2446 const u1* runtime_invisible_type_annotations = NULL;
2447 int runtime_invisible_type_annotations_length = 0;
2448 bool runtime_invisible_annotations_exists = false;
2449 bool runtime_invisible_type_annotations_exists = false;
2450 bool runtime_invisible_parameter_annotations_exists = false;
2451 const u1* annotation_default = NULL;
2452 int annotation_default_length = 0;
2453
2454 // Parse code and exceptions attribute
2455 u2 method_attributes_count = cfs->get_u2_fast();
2456 while (method_attributes_count--) {
2457 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2458 const u2 method_attribute_name_index = cfs->get_u2_fast();
2459 const u4 method_attribute_length = cfs->get_u4_fast();
2460 check_property(
2461 valid_symbol_at(method_attribute_name_index),
2462 "Invalid method attribute name index %u in class file %s",
2463 method_attribute_name_index, CHECK_NULL);
2464
2465 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2466 if (method_attribute_name == vmSymbols::tag_code()) {
2467 // Parse Code attribute
2468 if (_need_verify) {
2469 guarantee_property(
2470 !access_flags.is_native() && !access_flags.is_abstract(),
2471 "Code attribute in native or abstract methods in class file %s",
2472 CHECK_NULL);
2473 }
2474 if (parsed_code_attribute) {
2475 classfile_parse_error("Multiple Code attributes in class file %s",
2476 CHECK_NULL);
2477 }
2478 parsed_code_attribute = true;
2479
2480 // Stack size, locals size, and code size
2481 if (_major_version == 45 && _minor_version <= 2) {
2482 cfs->guarantee_more(4, CHECK_NULL);
2483 max_stack = cfs->get_u1_fast();
2484 max_locals = cfs->get_u1_fast();
2485 code_length = cfs->get_u2_fast();
2486 } else {
2487 cfs->guarantee_more(8, CHECK_NULL);
2488 max_stack = cfs->get_u2_fast();
2489 max_locals = cfs->get_u2_fast();
2490 code_length = cfs->get_u4_fast();
2491 }
2492 if (_need_verify) {
2493 guarantee_property(args_size <= max_locals,
2494 "Arguments can't fit into locals in class file %s",
2495 CHECK_NULL);
2496 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2497 "Invalid method Code length %u in class file %s",
2498 code_length, CHECK_NULL);
2499 }
2500 // Code pointer
2501 code_start = cfs->current();
2502 assert(code_start != NULL, "null code start");
2503 cfs->guarantee_more(code_length, CHECK_NULL);
2504 cfs->skip_u1_fast(code_length);
2505
2506 // Exception handler table
2507 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2508 exception_table_length = cfs->get_u2_fast();
2509 if (exception_table_length > 0) {
2510 exception_table_start = parse_exception_table(cfs,
2511 code_length,
2512 exception_table_length,
2513 CHECK_NULL);
2514 }
2515
2516 // Parse additional attributes in code attribute
2517 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2518 u2 code_attributes_count = cfs->get_u2_fast();
2519
2520 unsigned int calculated_attribute_length = 0;
2521
2522 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2523 calculated_attribute_length =
2524 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2525 } else {
2526 // max_stack, locals and length are smaller in pre-version 45.2 classes
2527 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2528 }
2529 calculated_attribute_length +=
2530 code_length +
2531 sizeof(exception_table_length) +
2532 sizeof(code_attributes_count) +
2533 exception_table_length *
2534 ( sizeof(u2) + // start_pc
2535 sizeof(u2) + // end_pc
2536 sizeof(u2) + // handler_pc
2537 sizeof(u2) ); // catch_type_index
2538
2539 while (code_attributes_count--) {
2540 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2541 const u2 code_attribute_name_index = cfs->get_u2_fast();
2542 const u4 code_attribute_length = cfs->get_u4_fast();
2543 calculated_attribute_length += code_attribute_length +
2544 sizeof(code_attribute_name_index) +
2545 sizeof(code_attribute_length);
2546 check_property(valid_symbol_at(code_attribute_name_index),
2547 "Invalid code attribute name index %u in class file %s",
2548 code_attribute_name_index,
2549 CHECK_NULL);
2550 if (LoadLineNumberTables &&
2551 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2552 // Parse and compress line number table
2553 parse_linenumber_table(code_attribute_length,
2554 code_length,
2555 &linenumber_table,
2556 CHECK_NULL);
2557
2558 } else if (LoadLocalVariableTables &&
2559 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2560 // Parse local variable table
2561 if (!lvt_allocated) {
2562 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2563 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2564 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2565 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2566 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2567 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2568 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2569 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2570 lvt_allocated = true;
2571 }
2572 if (lvt_cnt == max_lvt_cnt) {
2573 max_lvt_cnt <<= 1;
2574 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2575 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2576 }
2577 localvariable_table_start[lvt_cnt] =
2578 parse_localvariable_table(cfs,
2579 code_length,
2580 max_locals,
2581 code_attribute_length,
2582 &localvariable_table_length[lvt_cnt],
2583 false, // is not LVTT
2584 CHECK_NULL);
2585 total_lvt_length += localvariable_table_length[lvt_cnt];
2586 lvt_cnt++;
2587 } else if (LoadLocalVariableTypeTables &&
2588 _major_version >= JAVA_1_5_VERSION &&
2589 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2590 if (!lvt_allocated) {
2591 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2592 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2593 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2594 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2595 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2596 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2597 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2598 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2599 lvt_allocated = true;
2600 }
2601 // Parse local variable type table
2602 if (lvtt_cnt == max_lvtt_cnt) {
2603 max_lvtt_cnt <<= 1;
2604 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2605 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2606 }
2607 localvariable_type_table_start[lvtt_cnt] =
2608 parse_localvariable_table(cfs,
2609 code_length,
2610 max_locals,
2611 code_attribute_length,
2612 &localvariable_type_table_length[lvtt_cnt],
2613 true, // is LVTT
2614 CHECK_NULL);
2615 lvtt_cnt++;
2616 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2617 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2618 // Stack map is only needed by the new verifier in JDK1.5.
2619 if (parsed_stackmap_attribute) {
2620 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2621 }
2622 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2623 stackmap_data_length = code_attribute_length;
2624 parsed_stackmap_attribute = true;
2625 } else {
2626 // Skip unknown attributes
2627 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2628 }
2629 }
2630 // check method attribute length
2631 if (_need_verify) {
2632 guarantee_property(method_attribute_length == calculated_attribute_length,
2633 "Code segment has wrong length in class file %s",
2634 CHECK_NULL);
2635 }
2636 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2637 // Parse Exceptions attribute
2638 if (parsed_checked_exceptions_attribute) {
2639 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2640 CHECK_NULL);
2641 }
2642 parsed_checked_exceptions_attribute = true;
2643 checked_exceptions_start =
2644 parse_checked_exceptions(cfs,
2645 &checked_exceptions_length,
2646 method_attribute_length,
2647 CHECK_NULL);
2648 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2649 // reject multiple method parameters
2650 if (method_parameters_seen) {
2651 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2652 CHECK_NULL);
2653 }
2654 method_parameters_seen = true;
2655 method_parameters_length = cfs->get_u1_fast();
2656 const u2 real_length = (method_parameters_length * 4u) + 1u;
2657 if (method_attribute_length != real_length) {
2658 classfile_parse_error(
2659 "Invalid MethodParameters method attribute length %u in class file",
2660 method_attribute_length, CHECK_NULL);
2661 }
2662 method_parameters_data = cfs->current();
2663 cfs->skip_u2_fast(method_parameters_length);
2664 cfs->skip_u2_fast(method_parameters_length);
2665 // ignore this attribute if it cannot be reflected
2666 if (!SystemDictionary::Parameter_klass_loaded())
2667 method_parameters_length = -1;
2668 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2669 if (method_attribute_length != 0) {
2670 classfile_parse_error(
2671 "Invalid Synthetic method attribute length %u in class file %s",
2672 method_attribute_length, CHECK_NULL);
2673 }
2674 // Should we check that there hasn't already been a synthetic attribute?
2675 access_flags.set_is_synthetic();
2676 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2677 if (method_attribute_length != 0) {
2678 classfile_parse_error(
2679 "Invalid Deprecated method attribute length %u in class file %s",
2680 method_attribute_length, CHECK_NULL);
2681 }
2682 } else if (_major_version >= JAVA_1_5_VERSION) {
2683 if (method_attribute_name == vmSymbols::tag_signature()) {
2684 if (generic_signature_index != 0) {
2685 classfile_parse_error(
2686 "Multiple Signature attributes for method in class file %s",
2687 CHECK_NULL);
2688 }
2689 if (method_attribute_length != 2) {
2690 classfile_parse_error(
2691 "Invalid Signature attribute length %u in class file %s",
2692 method_attribute_length, CHECK_NULL);
2693 }
2694 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2695 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2696 if (runtime_visible_annotations != NULL) {
2697 classfile_parse_error(
2698 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2699 CHECK_NULL);
2700 }
2701 runtime_visible_annotations_length = method_attribute_length;
2702 runtime_visible_annotations = cfs->current();
2703 assert(runtime_visible_annotations != NULL, "null visible annotations");
2704 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2705 parse_annotations(cp,
2706 runtime_visible_annotations,
2707 runtime_visible_annotations_length,
2708 &parsed_annotations,
2709 _loader_data,
2710 CHECK_NULL);
2711 cfs->skip_u1_fast(runtime_visible_annotations_length);
2712 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2713 if (runtime_invisible_annotations_exists) {
2714 classfile_parse_error(
2715 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2716 CHECK_NULL);
2717 }
2718 runtime_invisible_annotations_exists = true;
2719 if (PreserveAllAnnotations) {
2720 runtime_invisible_annotations_length = method_attribute_length;
2721 runtime_invisible_annotations = cfs->current();
2722 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2723 }
2724 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2725 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2726 if (runtime_visible_parameter_annotations != NULL) {
2727 classfile_parse_error(
2728 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2729 CHECK_NULL);
2730 }
2731 runtime_visible_parameter_annotations_length = method_attribute_length;
2732 runtime_visible_parameter_annotations = cfs->current();
2733 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2734 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2735 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2736 if (runtime_invisible_parameter_annotations_exists) {
2737 classfile_parse_error(
2738 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2739 CHECK_NULL);
2740 }
2741 runtime_invisible_parameter_annotations_exists = true;
2742 if (PreserveAllAnnotations) {
2743 runtime_invisible_parameter_annotations_length = method_attribute_length;
2744 runtime_invisible_parameter_annotations = cfs->current();
2745 assert(runtime_invisible_parameter_annotations != NULL,
2746 "null invisible parameter annotations");
2747 }
2748 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2749 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2750 if (annotation_default != NULL) {
2751 classfile_parse_error(
2752 "Multiple AnnotationDefault attributes for method in class file %s",
2753 CHECK_NULL);
2754 }
2755 annotation_default_length = method_attribute_length;
2756 annotation_default = cfs->current();
2757 assert(annotation_default != NULL, "null annotation default");
2758 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2759 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2760 if (runtime_visible_type_annotations != NULL) {
2761 classfile_parse_error(
2762 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2763 CHECK_NULL);
2764 }
2765 runtime_visible_type_annotations_length = method_attribute_length;
2766 runtime_visible_type_annotations = cfs->current();
2767 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2768 // No need for the VM to parse Type annotations
2769 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2770 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2771 if (runtime_invisible_type_annotations_exists) {
2772 classfile_parse_error(
2773 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2774 CHECK_NULL);
2775 } else {
2776 runtime_invisible_type_annotations_exists = true;
2777 }
2778 if (PreserveAllAnnotations) {
2779 runtime_invisible_type_annotations_length = method_attribute_length;
2780 runtime_invisible_type_annotations = cfs->current();
2781 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2782 }
2783 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2784 } else {
2785 // Skip unknown attributes
2786 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2787 }
2788 } else {
2789 // Skip unknown attributes
2790 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2791 }
2792 }
2793
2794 if (linenumber_table != NULL) {
2795 linenumber_table->write_terminator();
2796 linenumber_table_length = linenumber_table->position();
2797 }
2798
2799 // Make sure there's at least one Code attribute in non-native/non-abstract method
2800 if (_need_verify) {
2801 guarantee_property(access_flags.is_native() ||
2802 access_flags.is_abstract() ||
2803 parsed_code_attribute,
2804 "Absent Code attribute in method that is not native or abstract in class file %s",
2805 CHECK_NULL);
2806 }
2807
2808 // All sizing information for a Method* is finally available, now create it
2809 InlineTableSizes sizes(
2810 total_lvt_length,
2811 linenumber_table_length,
2812 exception_table_length,
2813 checked_exceptions_length,
2814 method_parameters_length,
2815 generic_signature_index,
2816 runtime_visible_annotations_length +
2817 runtime_invisible_annotations_length,
2818 runtime_visible_parameter_annotations_length +
2819 runtime_invisible_parameter_annotations_length,
2820 runtime_visible_type_annotations_length +
2821 runtime_invisible_type_annotations_length,
2822 annotation_default_length,
2823 0);
2824
2825 Method* const m = Method::allocate(_loader_data,
2826 code_length,
2827 access_flags,
2828 &sizes,
2829 ConstMethod::NORMAL,
2830 CHECK_NULL);
2831
2832 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2833
2834 // Fill in information from fixed part (access_flags already set)
2835 m->set_constants(_cp);
2836 m->set_name_index(name_index);
2837 m->set_signature_index(signature_index);
2838
2839 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2840 m->constMethod()->set_result_type(rtf.type());
2841
2842 if (args_size >= 0) {
2843 m->set_size_of_parameters(args_size);
2844 } else {
2845 m->compute_size_of_parameters(THREAD);
2846 }
2847 #ifdef ASSERT
2848 if (args_size >= 0) {
2849 m->compute_size_of_parameters(THREAD);
2850 assert(args_size == m->size_of_parameters(), "");
2851 }
2852 #endif
2853
2854 // Fill in code attribute information
2855 m->set_max_stack(max_stack);
2856 m->set_max_locals(max_locals);
2857 if (stackmap_data != NULL) {
2858 m->constMethod()->copy_stackmap_data(_loader_data,
2859 (u1*)stackmap_data,
2860 stackmap_data_length,
2861 CHECK_NULL);
2862 }
2863
2864 // Copy byte codes
2865 m->set_code((u1*)code_start);
2866
2867 // Copy line number table
2868 if (linenumber_table != NULL) {
2869 memcpy(m->compressed_linenumber_table(),
2870 linenumber_table->buffer(),
2871 linenumber_table_length);
2872 }
2873
2874 // Copy exception table
2875 if (exception_table_length > 0) {
2876 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2877 m->exception_table_start(),
2878 exception_table_length * sizeof(ExceptionTableElement),
2879 sizeof(u2));
2880 }
2881
2882 // Copy method parameters
2883 if (method_parameters_length > 0) {
2884 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2885 for (int i = 0; i < method_parameters_length; i++) {
2886 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2887 method_parameters_data += 2;
2888 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2889 method_parameters_data += 2;
2890 }
2891 }
2892
2893 // Copy checked exceptions
2894 if (checked_exceptions_length > 0) {
2895 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2896 m->checked_exceptions_start(),
2897 checked_exceptions_length * sizeof(CheckedExceptionElement),
2898 sizeof(u2));
2899 }
2900
2901 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2902 if (total_lvt_length > 0) {
2903 promoted_flags->set_has_localvariable_table();
2904 copy_localvariable_table(m->constMethod(),
2905 lvt_cnt,
2906 localvariable_table_length,
2907 localvariable_table_start,
2908 lvtt_cnt,
2909 localvariable_type_table_length,
2910 localvariable_type_table_start,
2911 CHECK_NULL);
2912 }
2913
2914 if (parsed_annotations.has_any_annotations())
2915 parsed_annotations.apply_to(m);
2916
2917 // Copy annotations
2918 copy_method_annotations(m->constMethod(),
2919 runtime_visible_annotations,
2920 runtime_visible_annotations_length,
2921 runtime_invisible_annotations,
2922 runtime_invisible_annotations_length,
2923 runtime_visible_parameter_annotations,
2924 runtime_visible_parameter_annotations_length,
2925 runtime_invisible_parameter_annotations,
2926 runtime_invisible_parameter_annotations_length,
2927 runtime_visible_type_annotations,
2928 runtime_visible_type_annotations_length,
2929 runtime_invisible_type_annotations,
2930 runtime_invisible_type_annotations_length,
2931 annotation_default,
2932 annotation_default_length,
2933 CHECK_NULL);
2934
2935 if (name == vmSymbols::finalize_method_name() &&
2936 signature == vmSymbols::void_method_signature()) {
2937 if (m->is_empty_method()) {
2938 _has_empty_finalizer = true;
2939 } else {
2940 _has_finalizer = true;
2941 }
2942 }
2943 if (name == vmSymbols::object_initializer_name() &&
2944 signature == vmSymbols::void_method_signature() &&
2945 m->is_vanilla_constructor()) {
2946 _has_vanilla_constructor = true;
2947 }
2948
2949 NOT_PRODUCT(m->verify());
2950 return m;
2951 }
2952
2953
2954 // The promoted_flags parameter is used to pass relevant access_flags
2955 // from the methods back up to the containing klass. These flag values
2956 // are added to klass's access_flags.
2957 // Side-effects: populates the _methods field in the parser
2958 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2959 bool is_interface,
2960 AccessFlags* promoted_flags,
2961 bool* has_final_method,
2962 bool* declares_nonstatic_concrete_methods,
2963 TRAPS) {
2964 assert(cfs != NULL, "invariant");
2965 assert(promoted_flags != NULL, "invariant");
2966 assert(has_final_method != NULL, "invariant");
2967 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2968
2969 assert(NULL == _methods, "invariant");
2970
2971 cfs->guarantee_more(2, CHECK); // length
2972 const u2 length = cfs->get_u2_fast();
2973 if (length == 0) {
2974 _methods = Universe::the_empty_method_array();
2975 } else {
2976 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2977 length,
2978 NULL,
2979 CHECK);
2980
2981 for (int index = 0; index < length; index++) {
2982 Method* method = parse_method(cfs,
2983 is_interface,
2984 _cp,
2985 promoted_flags,
2986 CHECK);
2987
2988 if (method->is_final()) {
2989 *has_final_method = true;
2990 }
2991 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2992 // used for interface initialization, and default method inheritance analysis
2993 if (is_interface && !(*declares_nonstatic_concrete_methods)
2994 && !method->is_abstract() && !method->is_static()) {
2995 *declares_nonstatic_concrete_methods = true;
2996 }
2997 _methods->at_put(index, method);
2998 }
2999
3000 if (_need_verify && length > 1) {
3001 // Check duplicated methods
3002 ResourceMark rm(THREAD);
3003 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
3004 THREAD, NameSigHash*, HASH_ROW_SIZE);
3005 initialize_hashtable(names_and_sigs);
3006 bool dup = false;
3007 const Symbol* name = NULL;
3008 const Symbol* sig = NULL;
3009 {
3010 debug_only(NoSafepointVerifier nsv;)
3011 for (int i = 0; i < length; i++) {
3012 const Method* const m = _methods->at(i);
3013 name = m->name();
3014 sig = m->signature();
3015 // If no duplicates, add name/signature in hashtable names_and_sigs.
3016 if (!put_after_lookup(name, sig, names_and_sigs)) {
3017 dup = true;
3018 break;
3019 }
3020 }
3021 }
3022 if (dup) {
3023 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
3024 name->as_C_string(), sig->as_klass_external_name(), CHECK);
3025 }
3026 }
3027 }
3028 }
3029
3030 static const intArray* sort_methods(Array<Method*>* methods) {
3031 const int length = methods->length();
3032 // If JVMTI original method ordering or sharing is enabled we have to
3033 // remember the original class file ordering.
3034 // We temporarily use the vtable_index field in the Method* to store the
3035 // class file index, so we can read in after calling qsort.
3036 // Put the method ordering in the shared archive.
3037 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3038 for (int index = 0; index < length; index++) {
3039 Method* const m = methods->at(index);
3040 assert(!m->valid_vtable_index(), "vtable index should not be set");
3041 m->set_vtable_index(index);
3042 }
3043 }
3044 // Sort method array by ascending method name (for faster lookups & vtable construction)
3045 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3046 Method::sort_methods(methods);
3047
3048 intArray* method_ordering = NULL;
3049 // If JVMTI original method ordering or sharing is enabled construct int
3050 // array remembering the original ordering
3051 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3052 method_ordering = new intArray(length, length, -1);
3053 for (int index = 0; index < length; index++) {
3054 Method* const m = methods->at(index);
3055 const int old_index = m->vtable_index();
3056 assert(old_index >= 0 && old_index < length, "invalid method index");
3057 method_ordering->at_put(index, old_index);
3058 m->set_vtable_index(Method::invalid_vtable_index);
3059 }
3060 }
3061 return method_ordering;
3062 }
3063
3064 // Parse generic_signature attribute for methods and fields
3065 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3066 TRAPS) {
3067 assert(cfs != NULL, "invariant");
3068
3069 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3070 const u2 generic_signature_index = cfs->get_u2_fast();
3071 check_property(
3072 valid_symbol_at(generic_signature_index),
3073 "Invalid Signature attribute at constant pool index %u in class file %s",
3074 generic_signature_index, CHECK_0);
3075 return generic_signature_index;
3076 }
3077
3078 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3079 TRAPS) {
3080
3081 assert(cfs != NULL, "invariant");
3082
3083 cfs->guarantee_more(2, CHECK); // sourcefile_index
3084 const u2 sourcefile_index = cfs->get_u2_fast();
3085 check_property(
3086 valid_symbol_at(sourcefile_index),
3087 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3088 sourcefile_index, CHECK);
3089 set_class_sourcefile_index(sourcefile_index);
3090 }
3091
3092 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3093 int length,
3094 TRAPS) {
3095 assert(cfs != NULL, "invariant");
3096
3097 const u1* const sde_buffer = cfs->current();
3098 assert(sde_buffer != NULL, "null sde buffer");
3099
3100 // Don't bother storing it if there is no way to retrieve it
3101 if (JvmtiExport::can_get_source_debug_extension()) {
3102 assert((length+1) > length, "Overflow checking");
3103 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3104 for (int i = 0; i < length; i++) {
3105 sde[i] = sde_buffer[i];
3106 }
3107 sde[length] = '\0';
3108 set_class_sde_buffer((const char*)sde, length);
3109 }
3110 // Got utf8 string, set stream position forward
3111 cfs->skip_u1(length, CHECK);
3112 }
3113
3114
3115 // Inner classes can be static, private or protected (classic VM does this)
3116 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3117 JVM_ACC_PRIVATE | \
3118 JVM_ACC_PROTECTED | \
3119 JVM_ACC_STATIC \
3120 )
3121
3122 // Return number of classes in the inner classes attribute table
3123 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3124 const u1* const inner_classes_attribute_start,
3125 bool parsed_enclosingmethod_attribute,
3126 u2 enclosing_method_class_index,
3127 u2 enclosing_method_method_index,
3128 TRAPS) {
3129 const u1* const current_mark = cfs->current();
3130 u2 length = 0;
3131 if (inner_classes_attribute_start != NULL) {
3132 cfs->set_current(inner_classes_attribute_start);
3133 cfs->guarantee_more(2, CHECK_0); // length
3134 length = cfs->get_u2_fast();
3135 }
3136
3137 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3138 // method data:
3139 // [inner_class_info_index,
3140 // outer_class_info_index,
3141 // inner_name_index,
3142 // inner_class_access_flags,
3143 // ...
3144 // enclosing_method_class_index,
3145 // enclosing_method_method_index]
3146 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3147 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3148 _inner_classes = inner_classes;
3149
3150 int index = 0;
3151 const int cp_size = _cp->length();
3152 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3153 for (int n = 0; n < length; n++) {
3154 // Inner class index
3155 const u2 inner_class_info_index = cfs->get_u2_fast();
3156 check_property(
3157 valid_klass_reference_at(inner_class_info_index),
3158 "inner_class_info_index %u has bad constant type in class file %s",
3159 inner_class_info_index, CHECK_0);
3160 // Outer class index
3161 const u2 outer_class_info_index = cfs->get_u2_fast();
3162 check_property(
3163 outer_class_info_index == 0 ||
3164 valid_klass_reference_at(outer_class_info_index),
3165 "outer_class_info_index %u has bad constant type in class file %s",
3166 outer_class_info_index, CHECK_0);
3167 // Inner class name
3168 const u2 inner_name_index = cfs->get_u2_fast();
3169 check_property(
3170 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3171 "inner_name_index %u has bad constant type in class file %s",
3172 inner_name_index, CHECK_0);
3173 if (_need_verify) {
3174 guarantee_property(inner_class_info_index != outer_class_info_index,
3175 "Class is both outer and inner class in class file %s", CHECK_0);
3176 }
3177 // Access flags
3178 jint flags;
3179 // JVM_ACC_MODULE is defined in JDK-9 and later.
3180 if (_major_version >= JAVA_9_VERSION) {
3181 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3182 } else {
3183 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3184 }
3185 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3186 // Set abstract bit for old class files for backward compatibility
3187 flags |= JVM_ACC_ABSTRACT;
3188 }
3189 verify_legal_class_modifiers(flags, CHECK_0);
3190 AccessFlags inner_access_flags(flags);
3191
3192 inner_classes->at_put(index++, inner_class_info_index);
3193 inner_classes->at_put(index++, outer_class_info_index);
3194 inner_classes->at_put(index++, inner_name_index);
3195 inner_classes->at_put(index++, inner_access_flags.as_short());
3196 }
3197
3198 // 4347400: make sure there's no duplicate entry in the classes array
3199 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3200 for(int i = 0; i < length * 4; i += 4) {
3201 for(int j = i + 4; j < length * 4; j += 4) {
3202 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3203 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3204 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3205 inner_classes->at(i+3) != inner_classes->at(j+3)),
3206 "Duplicate entry in InnerClasses in class file %s",
3207 CHECK_0);
3208 }
3209 }
3210 }
3211
3212 // Set EnclosingMethod class and method indexes.
3213 if (parsed_enclosingmethod_attribute) {
3214 inner_classes->at_put(index++, enclosing_method_class_index);
3215 inner_classes->at_put(index++, enclosing_method_method_index);
3216 }
3217 assert(index == size, "wrong size");
3218
3219 // Restore buffer's current position.
3220 cfs->set_current(current_mark);
3221
3222 return length;
3223 }
3224
3225 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3226 set_class_synthetic_flag(true);
3227 }
3228
3229 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3230 assert(cfs != NULL, "invariant");
3231
3232 const u2 signature_index = cfs->get_u2(CHECK);
3233 check_property(
3234 valid_symbol_at(signature_index),
3235 "Invalid constant pool index %u in Signature attribute in class file %s",
3236 signature_index, CHECK);
3237 set_class_generic_signature_index(signature_index);
3238 }
3239
3240 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3241 ConstantPool* cp,
3242 u4 attribute_byte_length,
3243 TRAPS) {
3244 assert(cfs != NULL, "invariant");
3245 assert(cp != NULL, "invariant");
3246
3247 const u1* const current_start = cfs->current();
3248
3249 guarantee_property(attribute_byte_length >= sizeof(u2),
3250 "Invalid BootstrapMethods attribute length %u in class file %s",
3251 attribute_byte_length,
3252 CHECK);
3253
3254 cfs->guarantee_more(attribute_byte_length, CHECK);
3255
3256 const int attribute_array_length = cfs->get_u2_fast();
3257
3258 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3259 "Short length on BootstrapMethods in class file %s",
3260 CHECK);
3261
3262
3263 // The attribute contains a counted array of counted tuples of shorts,
3264 // represending bootstrap specifiers:
3265 // length*{bootstrap_method_index, argument_count*{argument_index}}
3266 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3267 // operand_count = number of shorts in attr, except for leading length
3268
3269 // The attribute is copied into a short[] array.
3270 // The array begins with a series of short[2] pairs, one for each tuple.
3271 const int index_size = (attribute_array_length * 2);
3272
3273 Array<u2>* const operands =
3274 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3275
3276 // Eagerly assign operands so they will be deallocated with the constant
3277 // pool if there is an error.
3278 cp->set_operands(operands);
3279
3280 int operand_fill_index = index_size;
3281 const int cp_size = cp->length();
3282
3283 for (int n = 0; n < attribute_array_length; n++) {
3284 // Store a 32-bit offset into the header of the operand array.
3285 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3286
3287 // Read a bootstrap specifier.
3288 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3289 const u2 bootstrap_method_index = cfs->get_u2_fast();
3290 const u2 argument_count = cfs->get_u2_fast();
3291 check_property(
3292 valid_cp_range(bootstrap_method_index, cp_size) &&
3293 cp->tag_at(bootstrap_method_index).is_method_handle(),
3294 "bootstrap_method_index %u has bad constant type in class file %s",
3295 bootstrap_method_index,
3296 CHECK);
3297
3298 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3299 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3300 CHECK);
3301
3302 operands->at_put(operand_fill_index++, bootstrap_method_index);
3303 operands->at_put(operand_fill_index++, argument_count);
3304
3305 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3306 for (int j = 0; j < argument_count; j++) {
3307 const u2 argument_index = cfs->get_u2_fast();
3308 check_property(
3309 valid_cp_range(argument_index, cp_size) &&
3310 cp->tag_at(argument_index).is_loadable_constant(),
3311 "argument_index %u has bad constant type in class file %s",
3312 argument_index,
3313 CHECK);
3314 operands->at_put(operand_fill_index++, argument_index);
3315 }
3316 }
3317 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3318 "Bad length on BootstrapMethods in class file %s",
3319 CHECK);
3320 }
3321
3322 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3323 ConstantPool* cp,
3324 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3325 TRAPS) {
3326 assert(cfs != NULL, "invariant");
3327 assert(cp != NULL, "invariant");
3328 assert(parsed_annotations != NULL, "invariant");
3329
3330 // Set inner classes attribute to default sentinel
3331 _inner_classes = Universe::the_empty_short_array();
3332 cfs->guarantee_more(2, CHECK); // attributes_count
3333 u2 attributes_count = cfs->get_u2_fast();
3334 bool parsed_sourcefile_attribute = false;
3335 bool parsed_innerclasses_attribute = false;
3336 bool parsed_enclosingmethod_attribute = false;
3337 bool parsed_bootstrap_methods_attribute = false;
3338 const u1* runtime_visible_annotations = NULL;
3339 int runtime_visible_annotations_length = 0;
3340 const u1* runtime_invisible_annotations = NULL;
3341 int runtime_invisible_annotations_length = 0;
3342 const u1* runtime_visible_type_annotations = NULL;
3343 int runtime_visible_type_annotations_length = 0;
3344 const u1* runtime_invisible_type_annotations = NULL;
3345 int runtime_invisible_type_annotations_length = 0;
3346 bool runtime_invisible_type_annotations_exists = false;
3347 bool runtime_invisible_annotations_exists = false;
3348 bool parsed_source_debug_ext_annotations_exist = false;
3349 const u1* inner_classes_attribute_start = NULL;
3350 u4 inner_classes_attribute_length = 0;
3351 u2 enclosing_method_class_index = 0;
3352 u2 enclosing_method_method_index = 0;
3353 // Iterate over attributes
3354 while (attributes_count--) {
3355 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3356 const u2 attribute_name_index = cfs->get_u2_fast();
3357 const u4 attribute_length = cfs->get_u4_fast();
3358 check_property(
3359 valid_symbol_at(attribute_name_index),
3360 "Attribute name has bad constant pool index %u in class file %s",
3361 attribute_name_index, CHECK);
3362 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3363 if (tag == vmSymbols::tag_source_file()) {
3364 // Check for SourceFile tag
3365 if (_need_verify) {
3366 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3367 }
3368 if (parsed_sourcefile_attribute) {
3369 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3370 } else {
3371 parsed_sourcefile_attribute = true;
3372 }
3373 parse_classfile_sourcefile_attribute(cfs, CHECK);
3374 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3375 // Check for SourceDebugExtension tag
3376 if (parsed_source_debug_ext_annotations_exist) {
3377 classfile_parse_error(
3378 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3379 }
3380 parsed_source_debug_ext_annotations_exist = true;
3381 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3382 } else if (tag == vmSymbols::tag_inner_classes()) {
3383 // Check for InnerClasses tag
3384 if (parsed_innerclasses_attribute) {
3385 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3386 } else {
3387 parsed_innerclasses_attribute = true;
3388 }
3389 inner_classes_attribute_start = cfs->current();
3390 inner_classes_attribute_length = attribute_length;
3391 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3392 } else if (tag == vmSymbols::tag_synthetic()) {
3393 // Check for Synthetic tag
3394 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3395 if (attribute_length != 0) {
3396 classfile_parse_error(
3397 "Invalid Synthetic classfile attribute length %u in class file %s",
3398 attribute_length, CHECK);
3399 }
3400 parse_classfile_synthetic_attribute(CHECK);
3401 } else if (tag == vmSymbols::tag_deprecated()) {
3402 // Check for Deprecatd tag - 4276120
3403 if (attribute_length != 0) {
3404 classfile_parse_error(
3405 "Invalid Deprecated classfile attribute length %u in class file %s",
3406 attribute_length, CHECK);
3407 }
3408 } else if (_major_version >= JAVA_1_5_VERSION) {
3409 if (tag == vmSymbols::tag_signature()) {
3410 if (_generic_signature_index != 0) {
3411 classfile_parse_error(
3412 "Multiple Signature attributes in class file %s", CHECK);
3413 }
3414 if (attribute_length != 2) {
3415 classfile_parse_error(
3416 "Wrong Signature attribute length %u in class file %s",
3417 attribute_length, CHECK);
3418 }
3419 parse_classfile_signature_attribute(cfs, CHECK);
3420 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3421 if (runtime_visible_annotations != NULL) {
3422 classfile_parse_error(
3423 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3424 }
3425 runtime_visible_annotations_length = attribute_length;
3426 runtime_visible_annotations = cfs->current();
3427 assert(runtime_visible_annotations != NULL, "null visible annotations");
3428 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3429 parse_annotations(cp,
3430 runtime_visible_annotations,
3431 runtime_visible_annotations_length,
3432 parsed_annotations,
3433 _loader_data,
3434 CHECK);
3435 cfs->skip_u1_fast(runtime_visible_annotations_length);
3436 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3437 if (runtime_invisible_annotations_exists) {
3438 classfile_parse_error(
3439 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3440 }
3441 runtime_invisible_annotations_exists = true;
3442 if (PreserveAllAnnotations) {
3443 runtime_invisible_annotations_length = attribute_length;
3444 runtime_invisible_annotations = cfs->current();
3445 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3446 }
3447 cfs->skip_u1(attribute_length, CHECK);
3448 } else if (tag == vmSymbols::tag_enclosing_method()) {
3449 if (parsed_enclosingmethod_attribute) {
3450 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3451 } else {
3452 parsed_enclosingmethod_attribute = true;
3453 }
3454 guarantee_property(attribute_length == 4,
3455 "Wrong EnclosingMethod attribute length %u in class file %s",
3456 attribute_length, CHECK);
3457 cfs->guarantee_more(4, CHECK); // class_index, method_index
3458 enclosing_method_class_index = cfs->get_u2_fast();
3459 enclosing_method_method_index = cfs->get_u2_fast();
3460 if (enclosing_method_class_index == 0) {
3461 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3462 }
3463 // Validate the constant pool indices and types
3464 check_property(valid_klass_reference_at(enclosing_method_class_index),
3465 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3466 if (enclosing_method_method_index != 0 &&
3467 (!cp->is_within_bounds(enclosing_method_method_index) ||
3468 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3469 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3470 }
3471 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3472 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3473 if (parsed_bootstrap_methods_attribute) {
3474 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3475 }
3476 parsed_bootstrap_methods_attribute = true;
3477 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3478 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3479 if (runtime_visible_type_annotations != NULL) {
3480 classfile_parse_error(
3481 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3482 }
3483 runtime_visible_type_annotations_length = attribute_length;
3484 runtime_visible_type_annotations = cfs->current();
3485 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3486 // No need for the VM to parse Type annotations
3487 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3488 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3489 if (runtime_invisible_type_annotations_exists) {
3490 classfile_parse_error(
3491 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3492 } else {
3493 runtime_invisible_type_annotations_exists = true;
3494 }
3495 if (PreserveAllAnnotations) {
3496 runtime_invisible_type_annotations_length = attribute_length;
3497 runtime_invisible_type_annotations = cfs->current();
3498 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3499 }
3500 cfs->skip_u1(attribute_length, CHECK);
3501 } else {
3502 // Unknown attribute
3503 cfs->skip_u1(attribute_length, CHECK);
3504 }
3505 } else {
3506 // Unknown attribute
3507 cfs->skip_u1(attribute_length, CHECK);
3508 }
3509 }
3510 _annotations = assemble_annotations(runtime_visible_annotations,
3511 runtime_visible_annotations_length,
3512 runtime_invisible_annotations,
3513 runtime_invisible_annotations_length,
3514 CHECK);
3515 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3516 runtime_visible_type_annotations_length,
3517 runtime_invisible_type_annotations,
3518 runtime_invisible_type_annotations_length,
3519 CHECK);
3520
3521 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3522 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3523 cfs,
3524 inner_classes_attribute_start,
3525 parsed_innerclasses_attribute,
3526 enclosing_method_class_index,
3527 enclosing_method_method_index,
3528 CHECK);
3529 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3530 guarantee_property(
3531 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3532 "Wrong InnerClasses attribute length in class file %s", CHECK);
3533 }
3534 }
3535
3536 if (_max_bootstrap_specifier_index >= 0) {
3537 guarantee_property(parsed_bootstrap_methods_attribute,
3538 "Missing BootstrapMethods attribute in class file %s", CHECK);
3539 }
3540 }
3541
3542 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3543 assert(k != NULL, "invariant");
3544
3545 if (_synthetic_flag)
3546 k->set_is_synthetic();
3547 if (_sourcefile_index != 0) {
3548 k->set_source_file_name_index(_sourcefile_index);
3549 }
3550 if (_generic_signature_index != 0) {
3551 k->set_generic_signature_index(_generic_signature_index);
3552 }
3553 if (_sde_buffer != NULL) {
3554 k->set_source_debug_extension(_sde_buffer, _sde_length);
3555 }
3556 }
3557
3558 // Create the Annotations object that will
3559 // hold the annotations array for the Klass.
3560 void ClassFileParser::create_combined_annotations(TRAPS) {
3561 if (_annotations == NULL &&
3562 _type_annotations == NULL &&
3563 _fields_annotations == NULL &&
3564 _fields_type_annotations == NULL) {
3565 // Don't create the Annotations object unnecessarily.
3566 return;
3567 }
3568
3569 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3570 annotations->set_class_annotations(_annotations);
3571 annotations->set_class_type_annotations(_type_annotations);
3572 annotations->set_fields_annotations(_fields_annotations);
3573 annotations->set_fields_type_annotations(_fields_type_annotations);
3574
3575 // This is the Annotations object that will be
3576 // assigned to InstanceKlass being constructed.
3577 _combined_annotations = annotations;
3578
3579 // The annotations arrays below has been transfered the
3580 // _combined_annotations so these fields can now be cleared.
3581 _annotations = NULL;
3582 _type_annotations = NULL;
3583 _fields_annotations = NULL;
3584 _fields_type_annotations = NULL;
3585 }
3586
3587 // Transfer ownership of metadata allocated to the InstanceKlass.
3588 void ClassFileParser::apply_parsed_class_metadata(
3589 InstanceKlass* this_klass,
3590 int java_fields_count, TRAPS) {
3591 assert(this_klass != NULL, "invariant");
3592
3593 _cp->set_pool_holder(this_klass);
3594 this_klass->set_constants(_cp);
3595 this_klass->set_fields(_fields, java_fields_count);
3596 this_klass->set_methods(_methods);
3597 this_klass->set_inner_classes(_inner_classes);
3598 this_klass->set_local_interfaces(_local_interfaces);
3599 this_klass->set_annotations(_combined_annotations);
3600 // Delay the setting of _transitive_interfaces until after initialize_supers() in
3601 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with
3602 // its _super. If an OOM occurs while loading the current klass, its _super field
3603 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3604 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3605 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3606
3607 // Clear out these fields so they don't get deallocated by the destructor
3608 clear_class_metadata();
3609 }
3610
3611 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3612 int runtime_visible_annotations_length,
3613 const u1* const runtime_invisible_annotations,
3614 int runtime_invisible_annotations_length,
3615 TRAPS) {
3616 AnnotationArray* annotations = NULL;
3617 if (runtime_visible_annotations != NULL ||
3618 runtime_invisible_annotations != NULL) {
3619 annotations = MetadataFactory::new_array<u1>(_loader_data,
3620 runtime_visible_annotations_length +
3621 runtime_invisible_annotations_length,
3622 CHECK_(annotations));
3623 if (runtime_visible_annotations != NULL) {
3624 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3625 annotations->at_put(i, runtime_visible_annotations[i]);
3626 }
3627 }
3628 if (runtime_invisible_annotations != NULL) {
3629 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3630 int append = runtime_visible_annotations_length+i;
3631 annotations->at_put(append, runtime_invisible_annotations[i]);
3632 }
3633 }
3634 }
3635 return annotations;
3636 }
3637
3638 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3639 const int super_class_index,
3640 const bool need_verify,
3641 TRAPS) {
3642 assert(cp != NULL, "invariant");
3643 const InstanceKlass* super_klass = NULL;
3644
3645 if (super_class_index == 0) {
3646 check_property(_class_name == vmSymbols::java_lang_Object(),
3647 "Invalid superclass index %u in class file %s",
3648 super_class_index,
3649 CHECK_NULL);
3650 } else {
3651 check_property(valid_klass_reference_at(super_class_index),
3652 "Invalid superclass index %u in class file %s",
3653 super_class_index,
3654 CHECK_NULL);
3655 // The class name should be legal because it is checked when parsing constant pool.
3656 // However, make sure it is not an array type.
3657 bool is_array = false;
3658 if (cp->tag_at(super_class_index).is_klass()) {
3659 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3660 if (need_verify)
3661 is_array = super_klass->is_array_klass();
3662 } else if (need_verify) {
3663 is_array = (cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3664 }
3665 if (need_verify) {
3666 guarantee_property(!is_array,
3667 "Bad superclass name in class file %s", CHECK_NULL);
3668 }
3669 }
3670 return super_klass;
3671 }
3672
3673 static unsigned int compute_oop_map_count(const InstanceKlass* super,
3674 unsigned int nonstatic_oop_map_count,
3675 int first_nonstatic_oop_offset) {
3676
3677 unsigned int map_count =
3678 NULL == super ? 0 : super->nonstatic_oop_map_count();
3679 if (nonstatic_oop_map_count > 0) {
3680 // We have oops to add to map
3681 if (map_count == 0) {
3682 map_count = nonstatic_oop_map_count;
3683 }
3684 else {
3685 // Check whether we should add a new map block or whether the last one can
3686 // be extended
3687 const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3688 const OopMapBlock* const last_map = first_map + map_count - 1;
3689
3690 const int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3691 if (next_offset == first_nonstatic_oop_offset) {
3692 // There is no gap bettwen superklass's last oop field and first
3693 // local oop field, merge maps.
3694 nonstatic_oop_map_count -= 1;
3695 }
3696 else {
3697 // Superklass didn't end with a oop field, add extra maps
3698 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3699 }
3700 map_count += nonstatic_oop_map_count;
3701 }
3702 }
3703 return map_count;
3704 }
3705
3706 #ifndef PRODUCT
3707 static void print_field_layout(const Symbol* name,
3708 Array<u2>* fields,
3709 const constantPoolHandle& cp,
3710 int instance_size,
3711 int instance_fields_start,
3712 int instance_fields_end,
3713 int static_fields_end) {
3714
3715 assert(name != NULL, "invariant");
3716
3717 tty->print("%s: field layout\n", name->as_klass_external_name());
3718 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3719 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3720 if (!fs.access_flags().is_static()) {
3721 tty->print(" @%3d \"%s\" %s\n",
3722 fs.offset(),
3723 fs.name()->as_klass_external_name(),
3724 fs.signature()->as_klass_external_name());
3725 }
3726 }
3727 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3728 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3729 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3730 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3731 if (fs.access_flags().is_static()) {
3732 tty->print(" @%3d \"%s\" %s\n",
3733 fs.offset(),
3734 fs.name()->as_klass_external_name(),
3735 fs.signature()->as_klass_external_name());
3736 }
3737 }
3738 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3739 tty->print("\n");
3740 }
3741 #endif
3742
3743 // Values needed for oopmap and InstanceKlass creation
3744 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3745 public:
3746 int* nonstatic_oop_offsets;
3747 unsigned int* nonstatic_oop_counts;
3748 unsigned int nonstatic_oop_map_count;
3749 unsigned int total_oop_map_count;
3750 int instance_size;
3751 int nonstatic_field_size;
3752 int static_field_size;
3753 bool has_nonstatic_fields;
3754 };
3755
3756 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3757 void ClassFileParser::layout_fields(ConstantPool* cp,
3758 const FieldAllocationCount* fac,
3759 const ClassAnnotationCollector* parsed_annotations,
3760 FieldLayoutInfo* info,
3761 TRAPS) {
3762
3763 assert(cp != NULL, "invariant");
3764
3765 // Field size and offset computation
3766 int nonstatic_field_size = _super_klass == NULL ? 0 :
3767 _super_klass->nonstatic_field_size();
3768
3769 // Count the contended fields by type.
3770 //
3771 // We ignore static fields, because @Contended is not supported for them.
3772 // The layout code below will also ignore the static fields.
3773 int nonstatic_contended_count = 0;
3774 FieldAllocationCount fac_contended;
3775 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3776 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3777 if (fs.is_contended()) {
3778 fac_contended.count[atype]++;
3779 if (!fs.access_flags().is_static()) {
3780 nonstatic_contended_count++;
3781 }
3782 }
3783 }
3784
3785
3786 // Calculate the starting byte offsets
3787 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3788 int next_static_double_offset = next_static_oop_offset +
3789 ((fac->count[STATIC_OOP]) * heapOopSize);
3790 if (fac->count[STATIC_DOUBLE]) {
3791 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
3792 }
3793
3794 int next_static_word_offset = next_static_double_offset +
3795 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3796 int next_static_short_offset = next_static_word_offset +
3797 ((fac->count[STATIC_WORD]) * BytesPerInt);
3798 int next_static_byte_offset = next_static_short_offset +
3799 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3800
3801 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3802 nonstatic_field_size * heapOopSize;
3803
3804 int next_nonstatic_field_offset = nonstatic_fields_start;
3805
3806 const bool is_contended_class = parsed_annotations->is_contended();
3807
3808 // Class is contended, pad before all the fields
3809 if (is_contended_class) {
3810 next_nonstatic_field_offset += ContendedPaddingWidth;
3811 }
3812
3813 // Compute the non-contended fields count.
3814 // The packing code below relies on these counts to determine if some field
3815 // can be squeezed into the alignment gap. Contended fields are obviously
3816 // exempt from that.
3817 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3818 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3819 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3820 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3821 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3822
3823 // Total non-static fields count, including every contended field
3824 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3825 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3826 fac->count[NONSTATIC_OOP];
3827
3828 const bool super_has_nonstatic_fields =
3829 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
3830 const bool has_nonstatic_fields =
3831 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3832
3833
3834 // Prepare list of oops for oop map generation.
3835 //
3836 // "offset" and "count" lists are describing the set of contiguous oop
3837 // regions. offset[i] is the start of the i-th region, which then has
3838 // count[i] oops following. Before we know how many regions are required,
3839 // we pessimistically allocate the maps to fit all the oops into the
3840 // distinct regions.
3841 //
3842 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3843 // to figure out if we still need to do this.
3844 unsigned int nonstatic_oop_map_count = 0;
3845 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3846
3847 int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3848 THREAD, int, max_nonstatic_oop_maps);
3849 unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3850 THREAD, unsigned int, max_nonstatic_oop_maps);
3851
3852 int first_nonstatic_oop_offset = 0; // will be set for first oop field
3853
3854 bool compact_fields = CompactFields;
3855 int allocation_style = FieldsAllocationStyle;
3856 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3857 assert(false, "0 <= FieldsAllocationStyle <= 2");
3858 allocation_style = 1; // Optimistic
3859 }
3860
3861 // The next classes have predefined hard-coded fields offsets
3862 // (see in JavaClasses::compute_hard_coded_offsets()).
3863 // Use default fields allocation order for them.
3864 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
3865 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3866 _class_name == vmSymbols::java_lang_Class() ||
3867 _class_name == vmSymbols::java_lang_ClassLoader() ||
3868 _class_name == vmSymbols::java_lang_ref_Reference() ||
3869 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3870 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3871 _class_name == vmSymbols::java_lang_String() ||
3872 _class_name == vmSymbols::java_lang_Throwable() ||
3873 _class_name == vmSymbols::java_lang_Boolean() ||
3874 _class_name == vmSymbols::java_lang_Character() ||
3875 _class_name == vmSymbols::java_lang_Float() ||
3876 _class_name == vmSymbols::java_lang_Double() ||
3877 _class_name == vmSymbols::java_lang_Byte() ||
3878 _class_name == vmSymbols::java_lang_Short() ||
3879 _class_name == vmSymbols::java_lang_Integer() ||
3880 _class_name == vmSymbols::java_lang_Long())) {
3881 allocation_style = 0; // Allocate oops first
3882 compact_fields = false; // Don't compact fields
3883 }
3884
3885 int next_nonstatic_oop_offset = 0;
3886 int next_nonstatic_double_offset = 0;
3887
3888 // Rearrange fields for a given allocation style
3889 if( allocation_style == 0 ) {
3890 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3891 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3892 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3893 (nonstatic_oop_count * heapOopSize);
3894 } else if( allocation_style == 1 ) {
3895 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3896 next_nonstatic_double_offset = next_nonstatic_field_offset;
3897 } else if( allocation_style == 2 ) {
3898 // Fields allocation: oops fields in super and sub classes are together.
3899 if( nonstatic_field_size > 0 && _super_klass != NULL &&
3900 _super_klass->nonstatic_oop_map_size() > 0 ) {
3901 const unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3902 const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps();
3903 const OopMapBlock* const last_map = first_map + map_count - 1;
3904 const int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3905 if (next_offset == next_nonstatic_field_offset) {
3906 allocation_style = 0; // allocate oops first
3907 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3908 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3909 (nonstatic_oop_count * heapOopSize);
3910 }
3911 }
3912 if( allocation_style == 2 ) {
3913 allocation_style = 1; // allocate oops last
3914 next_nonstatic_double_offset = next_nonstatic_field_offset;
3915 }
3916 } else {
3917 ShouldNotReachHere();
3918 }
3919
3920 int nonstatic_oop_space_count = 0;
3921 int nonstatic_word_space_count = 0;
3922 int nonstatic_short_space_count = 0;
3923 int nonstatic_byte_space_count = 0;
3924 int nonstatic_oop_space_offset = 0;
3925 int nonstatic_word_space_offset = 0;
3926 int nonstatic_short_space_offset = 0;
3927 int nonstatic_byte_space_offset = 0;
3928
3929 // Try to squeeze some of the fields into the gaps due to
3930 // long/double alignment.
3931 if (nonstatic_double_count > 0) {
3932 int offset = next_nonstatic_double_offset;
3933 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
3934 if (compact_fields && offset != next_nonstatic_double_offset) {
3935 // Allocate available fields into the gap before double field.
3936 int length = next_nonstatic_double_offset - offset;
3937 assert(length == BytesPerInt, "");
3938 nonstatic_word_space_offset = offset;
3939 if (nonstatic_word_count > 0) {
3940 nonstatic_word_count -= 1;
3941 nonstatic_word_space_count = 1; // Only one will fit
3942 length -= BytesPerInt;
3943 offset += BytesPerInt;
3944 }
3945 nonstatic_short_space_offset = offset;
3946 while (length >= BytesPerShort && nonstatic_short_count > 0) {
3947 nonstatic_short_count -= 1;
3948 nonstatic_short_space_count += 1;
3949 length -= BytesPerShort;
3950 offset += BytesPerShort;
3951 }
3952 nonstatic_byte_space_offset = offset;
3953 while (length > 0 && nonstatic_byte_count > 0) {
3954 nonstatic_byte_count -= 1;
3955 nonstatic_byte_space_count += 1;
3956 length -= 1;
3957 }
3958 // Allocate oop field in the gap if there are no other fields for that.
3959 nonstatic_oop_space_offset = offset;
3960 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
3961 allocation_style != 0) { // when oop fields not first
3962 nonstatic_oop_count -= 1;
3963 nonstatic_oop_space_count = 1; // Only one will fit
3964 length -= heapOopSize;
3965 offset += heapOopSize;
3966 }
3967 }
3968 }
3969
3970 int next_nonstatic_word_offset = next_nonstatic_double_offset +
3971 (nonstatic_double_count * BytesPerLong);
3972 int next_nonstatic_short_offset = next_nonstatic_word_offset +
3973 (nonstatic_word_count * BytesPerInt);
3974 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
3975 (nonstatic_short_count * BytesPerShort);
3976 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3977 nonstatic_byte_count;
3978
3979 // let oops jump before padding with this allocation style
3980 if( allocation_style == 1 ) {
3981 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3982 if( nonstatic_oop_count > 0 ) {
3983 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
3984 }
3985 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3986 }
3987
3988 // Iterate over fields again and compute correct offsets.
3989 // The field allocation type was temporarily stored in the offset slot.
3990 // oop fields are located before non-oop fields (static and non-static).
3991 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3992
3993 // skip already laid out fields
3994 if (fs.is_offset_set()) continue;
3995
3996 // contended instance fields are handled below
3997 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3998
3999 int real_offset = 0;
4000 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4001
4002 // pack the rest of the fields
4003 switch (atype) {
4004 case STATIC_OOP:
4005 real_offset = next_static_oop_offset;
4006 next_static_oop_offset += heapOopSize;
4007 break;
4008 case STATIC_BYTE:
4009 real_offset = next_static_byte_offset;
4010 next_static_byte_offset += 1;
4011 break;
4012 case STATIC_SHORT:
4013 real_offset = next_static_short_offset;
4014 next_static_short_offset += BytesPerShort;
4015 break;
4016 case STATIC_WORD:
4017 real_offset = next_static_word_offset;
4018 next_static_word_offset += BytesPerInt;
4019 break;
4020 case STATIC_DOUBLE:
4021 real_offset = next_static_double_offset;
4022 next_static_double_offset += BytesPerLong;
4023 break;
4024 case NONSTATIC_OOP:
4025 if( nonstatic_oop_space_count > 0 ) {
4026 real_offset = nonstatic_oop_space_offset;
4027 nonstatic_oop_space_offset += heapOopSize;
4028 nonstatic_oop_space_count -= 1;
4029 } else {
4030 real_offset = next_nonstatic_oop_offset;
4031 next_nonstatic_oop_offset += heapOopSize;
4032 }
4033
4034 // Record this oop in the oop maps
4035 if( nonstatic_oop_map_count > 0 &&
4036 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4037 real_offset -
4038 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4039 heapOopSize ) {
4040 // This oop is adjacent to the previous one, add to current oop map
4041 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4042 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4043 } else {
4044 // This oop is not adjacent to the previous one, create new oop map
4045 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4046 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4047 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4048 nonstatic_oop_map_count += 1;
4049 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4050 first_nonstatic_oop_offset = real_offset;
4051 }
4052 }
4053 break;
4054 case NONSTATIC_BYTE:
4055 if( nonstatic_byte_space_count > 0 ) {
4056 real_offset = nonstatic_byte_space_offset;
4057 nonstatic_byte_space_offset += 1;
4058 nonstatic_byte_space_count -= 1;
4059 } else {
4060 real_offset = next_nonstatic_byte_offset;
4061 next_nonstatic_byte_offset += 1;
4062 }
4063 break;
4064 case NONSTATIC_SHORT:
4065 if( nonstatic_short_space_count > 0 ) {
4066 real_offset = nonstatic_short_space_offset;
4067 nonstatic_short_space_offset += BytesPerShort;
4068 nonstatic_short_space_count -= 1;
4069 } else {
4070 real_offset = next_nonstatic_short_offset;
4071 next_nonstatic_short_offset += BytesPerShort;
4072 }
4073 break;
4074 case NONSTATIC_WORD:
4075 if( nonstatic_word_space_count > 0 ) {
4076 real_offset = nonstatic_word_space_offset;
4077 nonstatic_word_space_offset += BytesPerInt;
4078 nonstatic_word_space_count -= 1;
4079 } else {
4080 real_offset = next_nonstatic_word_offset;
4081 next_nonstatic_word_offset += BytesPerInt;
4082 }
4083 break;
4084 case NONSTATIC_DOUBLE:
4085 real_offset = next_nonstatic_double_offset;
4086 next_nonstatic_double_offset += BytesPerLong;
4087 break;
4088 default:
4089 ShouldNotReachHere();
4090 }
4091 fs.set_offset(real_offset);
4092 }
4093
4094
4095 // Handle the contended cases.
4096 //
4097 // Each contended field should not intersect the cache line with another contended field.
4098 // In the absence of alignment information, we end up with pessimistically separating
4099 // the fields with full-width padding.
4100 //
4101 // Additionally, this should not break alignment for the fields, so we round the alignment up
4102 // for each field.
4103 if (nonstatic_contended_count > 0) {
4104
4105 // if there is at least one contended field, we need to have pre-padding for them
4106 next_nonstatic_padded_offset += ContendedPaddingWidth;
4107
4108 // collect all contended groups
4109 ResourceBitMap bm(cp->size());
4110 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4111 // skip already laid out fields
4112 if (fs.is_offset_set()) continue;
4113
4114 if (fs.is_contended()) {
4115 bm.set_bit(fs.contended_group());
4116 }
4117 }
4118
4119 int current_group = -1;
4120 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4121
4122 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4123
4124 // skip already laid out fields
4125 if (fs.is_offset_set()) continue;
4126
4127 // skip non-contended fields and fields from different group
4128 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4129
4130 // handle statics below
4131 if (fs.access_flags().is_static()) continue;
4132
4133 int real_offset = 0;
4134 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4135
4136 switch (atype) {
4137 case NONSTATIC_BYTE:
4138 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4139 real_offset = next_nonstatic_padded_offset;
4140 next_nonstatic_padded_offset += 1;
4141 break;
4142
4143 case NONSTATIC_SHORT:
4144 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4145 real_offset = next_nonstatic_padded_offset;
4146 next_nonstatic_padded_offset += BytesPerShort;
4147 break;
4148
4149 case NONSTATIC_WORD:
4150 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4151 real_offset = next_nonstatic_padded_offset;
4152 next_nonstatic_padded_offset += BytesPerInt;
4153 break;
4154
4155 case NONSTATIC_DOUBLE:
4156 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4157 real_offset = next_nonstatic_padded_offset;
4158 next_nonstatic_padded_offset += BytesPerLong;
4159 break;
4160
4161 case NONSTATIC_OOP:
4162 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4163 real_offset = next_nonstatic_padded_offset;
4164 next_nonstatic_padded_offset += heapOopSize;
4165
4166 // Record this oop in the oop maps
4167 if( nonstatic_oop_map_count > 0 &&
4168 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4169 real_offset -
4170 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4171 heapOopSize ) {
4172 // This oop is adjacent to the previous one, add to current oop map
4173 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4174 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4175 } else {
4176 // This oop is not adjacent to the previous one, create new oop map
4177 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4178 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4179 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4180 nonstatic_oop_map_count += 1;
4181 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4182 first_nonstatic_oop_offset = real_offset;
4183 }
4184 }
4185 break;
4186
4187 default:
4188 ShouldNotReachHere();
4189 }
4190
4191 if (fs.contended_group() == 0) {
4192 // Contended group defines the equivalence class over the fields:
4193 // the fields within the same contended group are not inter-padded.
4194 // The only exception is default group, which does not incur the
4195 // equivalence, and so requires intra-padding.
4196 next_nonstatic_padded_offset += ContendedPaddingWidth;
4197 }
4198
4199 fs.set_offset(real_offset);
4200 } // for
4201
4202 // Start laying out the next group.
4203 // Note that this will effectively pad the last group in the back;
4204 // this is expected to alleviate memory contention effects for
4205 // subclass fields and/or adjacent object.
4206 // If this was the default group, the padding is already in place.
4207 if (current_group != 0) {
4208 next_nonstatic_padded_offset += ContendedPaddingWidth;
4209 }
4210 }
4211
4212 // handle static fields
4213 }
4214
4215 // Entire class is contended, pad in the back.
4216 // This helps to alleviate memory contention effects for subclass fields
4217 // and/or adjacent object.
4218 if (is_contended_class) {
4219 next_nonstatic_padded_offset += ContendedPaddingWidth;
4220 }
4221
4222 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4223
4224 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize);
4225 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4226 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4227
4228 int static_field_size = (static_fields_end -
4229 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4230 nonstatic_field_size = nonstatic_field_size +
4231 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4232
4233 int instance_size = align_object_size(instance_end / wordSize);
4234
4235 assert(instance_size == align_object_size(align_up(
4236 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
4237 wordSize) / wordSize), "consistent layout helper value");
4238
4239 // Invariant: nonstatic_field end/start should only change if there are
4240 // nonstatic fields in the class, or if the class is contended. We compare
4241 // against the non-aligned value, so that end alignment will not fail the
4242 // assert without actually having the fields.
4243 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4244 is_contended_class ||
4245 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4246
4247 // Number of non-static oop map blocks allocated at end of klass.
4248 const unsigned int total_oop_map_count =
4249 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
4250 first_nonstatic_oop_offset);
4251
4252 #ifndef PRODUCT
4253 if (PrintFieldLayout) {
4254 print_field_layout(_class_name,
4255 _fields,
4256 cp,
4257 instance_size,
4258 nonstatic_fields_start,
4259 nonstatic_fields_end,
4260 static_fields_end);
4261 }
4262
4263 #endif
4264 // Pass back information needed for InstanceKlass creation
4265 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
4266 info->nonstatic_oop_counts = nonstatic_oop_counts;
4267 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
4268 info->total_oop_map_count = total_oop_map_count;
4269 info->instance_size = instance_size;
4270 info->static_field_size = static_field_size;
4271 info->nonstatic_field_size = nonstatic_field_size;
4272 info->has_nonstatic_fields = has_nonstatic_fields;
4273 }
4274
4275 static void fill_oop_maps(const InstanceKlass* k,
4276 unsigned int nonstatic_oop_map_count,
4277 const int* nonstatic_oop_offsets,
4278 const unsigned int* nonstatic_oop_counts) {
4279
4280 assert(k != NULL, "invariant");
4281
4282 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4283 const InstanceKlass* const super = k->superklass();
4284 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4285 if (super_count > 0) {
4286 // Copy maps from superklass
4287 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4288 for (unsigned int i = 0; i < super_count; ++i) {
4289 *this_oop_map++ = *super_oop_map++;
4290 }
4291 }
4292
4293 if (nonstatic_oop_map_count > 0) {
4294 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4295 // The counts differ because there is no gap between superklass's last oop
4296 // field and the first local oop field. Extend the last oop map copied
4297 // from the superklass instead of creating new one.
4298 nonstatic_oop_map_count--;
4299 nonstatic_oop_offsets++;
4300 this_oop_map--;
4301 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4302 this_oop_map++;
4303 }
4304
4305 // Add new map blocks, fill them
4306 while (nonstatic_oop_map_count-- > 0) {
4307 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4308 this_oop_map->set_count(*nonstatic_oop_counts++);
4309 this_oop_map++;
4310 }
4311 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4312 this_oop_map, "sanity");
4313 }
4314 }
4315
4316
4317 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4318 assert(ik != NULL, "invariant");
4319
4320 const Klass* const super = ik->super();
4321
4322 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4323 // in which case we don't have to register objects as finalizable
4324 if (!_has_empty_finalizer) {
4325 if (_has_finalizer ||
4326 (super != NULL && super->has_finalizer())) {
4327 ik->set_has_finalizer();
4328 }
4329 }
4330
4331 #ifdef ASSERT
4332 bool f = false;
4333 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4334 vmSymbols::void_method_signature());
4335 if (m != NULL && !m->is_empty_method()) {
4336 f = true;
4337 }
4338
4339 // Spec doesn't prevent agent from redefinition of empty finalizer.
4340 // Despite the fact that it's generally bad idea and redefined finalizer
4341 // will not work as expected we shouldn't abort vm in this case
4342 if (!ik->has_redefined_this_or_super()) {
4343 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4344 }
4345 #endif
4346
4347 // Check if this klass supports the java.lang.Cloneable interface
4348 if (SystemDictionary::Cloneable_klass_loaded()) {
4349 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4350 ik->set_is_cloneable();
4351 }
4352 }
4353
4354 // Check if this klass has a vanilla default constructor
4355 if (super == NULL) {
4356 // java.lang.Object has empty default constructor
4357 ik->set_has_vanilla_constructor();
4358 } else {
4359 if (super->has_vanilla_constructor() &&
4360 _has_vanilla_constructor) {
4361 ik->set_has_vanilla_constructor();
4362 }
4363 #ifdef ASSERT
4364 bool v = false;
4365 if (super->has_vanilla_constructor()) {
4366 const Method* const constructor =
4367 ik->find_method(vmSymbols::object_initializer_name(),
4368 vmSymbols::void_method_signature());
4369 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4370 v = true;
4371 }
4372 }
4373 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4374 #endif
4375 }
4376
4377 // If it cannot be fast-path allocated, set a bit in the layout helper.
4378 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4379 assert(ik->size_helper() > 0, "layout_helper is initialized");
4380 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4381 || ik->is_abstract() || ik->is_interface()
4382 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4383 || ik->size_helper() >= FastAllocateSizeLimit) {
4384 // Forbid fast-path allocation.
4385 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4386 ik->set_layout_helper(lh);
4387 }
4388 }
4389
4390 // Attach super classes and interface classes to class loader data
4391 static void record_defined_class_dependencies(const InstanceKlass* defined_klass,
4392 TRAPS) {
4393 assert(defined_klass != NULL, "invariant");
4394
4395 ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data();
4396 if (defining_loader_data->is_the_null_class_loader_data()) {
4397 // Dependencies to null class loader data are implicit.
4398 return;
4399 } else {
4400 // add super class dependency
4401 Klass* const super = defined_klass->super();
4402 if (super != NULL) {
4403 defining_loader_data->record_dependency(super);
4404 }
4405
4406 // add super interface dependencies
4407 const Array<Klass*>* const local_interfaces = defined_klass->local_interfaces();
4408 if (local_interfaces != NULL) {
4409 const int length = local_interfaces->length();
4410 for (int i = 0; i < length; i++) {
4411 defining_loader_data->record_dependency(local_interfaces->at(i));
4412 }
4413 }
4414 }
4415 }
4416
4417 // utility methods for appending an array with check for duplicates
4418
4419 static void append_interfaces(GrowableArray<Klass*>* result,
4420 const Array<Klass*>* const ifs) {
4421 // iterate over new interfaces
4422 for (int i = 0; i < ifs->length(); i++) {
4423 Klass* const e = ifs->at(i);
4424 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4425 // add new interface
4426 result->append_if_missing(e);
4427 }
4428 }
4429
4430 static Array<Klass*>* compute_transitive_interfaces(const InstanceKlass* super,
4431 Array<Klass*>* local_ifs,
4432 ClassLoaderData* loader_data,
4433 TRAPS) {
4434 assert(local_ifs != NULL, "invariant");
4435 assert(loader_data != NULL, "invariant");
4436
4437 // Compute maximum size for transitive interfaces
4438 int max_transitive_size = 0;
4439 int super_size = 0;
4440 // Add superclass transitive interfaces size
4441 if (super != NULL) {
4442 super_size = super->transitive_interfaces()->length();
4443 max_transitive_size += super_size;
4444 }
4445 // Add local interfaces' super interfaces
4446 const int local_size = local_ifs->length();
4447 for (int i = 0; i < local_size; i++) {
4448 Klass* const l = local_ifs->at(i);
4449 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4450 }
4451 // Finally add local interfaces
4452 max_transitive_size += local_size;
4453 // Construct array
4454 if (max_transitive_size == 0) {
4455 // no interfaces, use canonicalized array
4456 return Universe::the_empty_klass_array();
4457 } else if (max_transitive_size == super_size) {
4458 // no new local interfaces added, share superklass' transitive interface array
4459 return super->transitive_interfaces();
4460 } else if (max_transitive_size == local_size) {
4461 // only local interfaces added, share local interface array
4462 return local_ifs;
4463 } else {
4464 ResourceMark rm;
4465 GrowableArray<Klass*>* const result = new GrowableArray<Klass*>(max_transitive_size);
4466
4467 // Copy down from superclass
4468 if (super != NULL) {
4469 append_interfaces(result, super->transitive_interfaces());
4470 }
4471
4472 // Copy down from local interfaces' superinterfaces
4473 for (int i = 0; i < local_size; i++) {
4474 Klass* const l = local_ifs->at(i);
4475 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4476 }
4477 // Finally add local interfaces
4478 append_interfaces(result, local_ifs);
4479
4480 // length will be less than the max_transitive_size if duplicates were removed
4481 const int length = result->length();
4482 assert(length <= max_transitive_size, "just checking");
4483 Array<Klass*>* const new_result =
4484 MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL);
4485 for (int i = 0; i < length; i++) {
4486 Klass* const e = result->at(i);
4487 assert(e != NULL, "just checking");
4488 new_result->at_put(i, e);
4489 }
4490 return new_result;
4491 }
4492 }
4493
4494 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4495 assert(this_klass != NULL, "invariant");
4496 const Klass* const super = this_klass->super();
4497 if (super != NULL) {
4498
4499 // If the loader is not the boot loader then throw an exception if its
4500 // superclass is in package jdk.internal.reflect and its loader is not a
4501 // special reflection class loader
4502 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4503 assert(super->is_instance_klass(), "super is not instance klass");
4504 PackageEntry* super_package = super->package();
4505 if (super_package != NULL &&
4506 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4507 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4508 ResourceMark rm(THREAD);
4509 Exceptions::fthrow(
4510 THREAD_AND_LOCATION,
4511 vmSymbols::java_lang_IllegalAccessError(),
4512 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4513 this_klass->external_name(),
4514 this_klass->class_loader_data()->loader_name_and_id(),
4515 super->external_name());
4516 return;
4517 }
4518 }
4519
4520 Reflection::VerifyClassAccessResults vca_result =
4521 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4522 if (vca_result != Reflection::ACCESS_OK) {
4523 ResourceMark rm(THREAD);
4524 char* msg = Reflection::verify_class_access_msg(this_klass,
4525 InstanceKlass::cast(super),
4526 vca_result);
4527 if (msg == NULL) {
4528 Exceptions::fthrow(
4529 THREAD_AND_LOCATION,
4530 vmSymbols::java_lang_IllegalAccessError(),
4531 "class %s cannot access its superclass %s",
4532 this_klass->external_name(),
4533 super->external_name());
4534 } else {
4535 // Add additional message content.
4536 Exceptions::fthrow(
4537 THREAD_AND_LOCATION,
4538 vmSymbols::java_lang_IllegalAccessError(),
4539 "superclass access check failed: %s",
4540 msg);
4541 }
4542 }
4543 }
4544 }
4545
4546
4547 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4548 assert(this_klass != NULL, "invariant");
4549 const Array<Klass*>* const local_interfaces = this_klass->local_interfaces();
4550 const int lng = local_interfaces->length();
4551 for (int i = lng - 1; i >= 0; i--) {
4552 Klass* const k = local_interfaces->at(i);
4553 assert (k != NULL && k->is_interface(), "invalid interface");
4554 Reflection::VerifyClassAccessResults vca_result =
4555 Reflection::verify_class_access(this_klass, InstanceKlass::cast(k), false);
4556 if (vca_result != Reflection::ACCESS_OK) {
4557 ResourceMark rm(THREAD);
4558 char* msg = Reflection::verify_class_access_msg(this_klass,
4559 InstanceKlass::cast(k),
4560 vca_result);
4561 if (msg == NULL) {
4562 Exceptions::fthrow(
4563 THREAD_AND_LOCATION,
4564 vmSymbols::java_lang_IllegalAccessError(),
4565 "class %s cannot access its superinterface %s",
4566 this_klass->external_name(),
4567 k->external_name());
4568 } else {
4569 // Add additional message content.
4570 Exceptions::fthrow(
4571 THREAD_AND_LOCATION,
4572 vmSymbols::java_lang_IllegalAccessError(),
4573 "superinterface check failed: %s",
4574 msg);
4575 }
4576 }
4577 }
4578 }
4579
4580
4581 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4582 assert(this_klass != NULL, "invariant");
4583 const Array<Method*>* const methods = this_klass->methods();
4584 const int num_methods = methods->length();
4585
4586 // go thru each method and check if it overrides a final method
4587 for (int index = 0; index < num_methods; index++) {
4588 const Method* const m = methods->at(index);
4589
4590 // skip private, static, and <init> methods
4591 if ((!m->is_private() && !m->is_static()) &&
4592 (m->name() != vmSymbols::object_initializer_name())) {
4593
4594 const Symbol* const name = m->name();
4595 const Symbol* const signature = m->signature();
4596 const Klass* k = this_klass->super();
4597 const Method* super_m = NULL;
4598 while (k != NULL) {
4599 // skip supers that don't have final methods.
4600 if (k->has_final_method()) {
4601 // lookup a matching method in the super class hierarchy
4602 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4603 if (super_m == NULL) {
4604 break; // didn't find any match; get out
4605 }
4606
4607 if (super_m->is_final() && !super_m->is_static() &&
4608 // matching method in super is final, and not static
4609 (Reflection::verify_field_access(this_klass,
4610 super_m->method_holder(),
4611 super_m->method_holder(),
4612 super_m->access_flags(), false))
4613 // this class can access super final method and therefore override
4614 ) {
4615 ResourceMark rm(THREAD);
4616 Exceptions::fthrow(
4617 THREAD_AND_LOCATION,
4618 vmSymbols::java_lang_VerifyError(),
4619 "class %s overrides final method %s.%s%s",
4620 this_klass->external_name(),
4621 super_m->method_holder()->external_name(),
4622 name->as_C_string(),
4623 signature->as_C_string()
4624 );
4625 return;
4626 }
4627
4628 // continue to look from super_m's holder's super.
4629 k = super_m->method_holder()->super();
4630 continue;
4631 }
4632
4633 k = k->super();
4634 }
4635 }
4636 }
4637 }
4638
4639
4640 // assumes that this_klass is an interface
4641 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4642 assert(this_klass != NULL, "invariant");
4643 assert(this_klass->is_interface(), "not an interface");
4644 const Array<Method*>* methods = this_klass->methods();
4645 const int num_methods = methods->length();
4646
4647 for (int index = 0; index < num_methods; index++) {
4648 const Method* const m = methods->at(index);
4649 // if m is static and not the init method, throw a verify error
4650 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4651 ResourceMark rm(THREAD);
4652 Exceptions::fthrow(
4653 THREAD_AND_LOCATION,
4654 vmSymbols::java_lang_VerifyError(),
4655 "Illegal static method %s in interface %s",
4656 m->name()->as_C_string(),
4657 this_klass->external_name()
4658 );
4659 return;
4660 }
4661 }
4662 }
4663
4664 // utility methods for format checking
4665
4666 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4667 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4668 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4669 if (is_module) {
4670 ResourceMark rm(THREAD);
4671 Exceptions::fthrow(
4672 THREAD_AND_LOCATION,
4673 vmSymbols::java_lang_NoClassDefFoundError(),
4674 "%s is not a class because access_flag ACC_MODULE is set",
4675 _class_name->as_C_string());
4676 return;
4677 }
4678
4679 if (!_need_verify) { return; }
4680
4681 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4682 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4683 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4684 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4685 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4686 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4687 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4688
4689 if ((is_abstract && is_final) ||
4690 (is_interface && !is_abstract) ||
4691 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4692 (!is_interface && major_gte_15 && is_annotation)) {
4693 ResourceMark rm(THREAD);
4694 Exceptions::fthrow(
4695 THREAD_AND_LOCATION,
4696 vmSymbols::java_lang_ClassFormatError(),
4697 "Illegal class modifiers in class %s: 0x%X",
4698 _class_name->as_C_string(), flags
4699 );
4700 return;
4701 }
4702 }
4703
4704 static bool has_illegal_visibility(jint flags) {
4705 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4706 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4707 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4708
4709 return ((is_public && is_protected) ||
4710 (is_public && is_private) ||
4711 (is_protected && is_private));
4712 }
4713
4714 // A legal major_version.minor_version must be one of the following:
4715 //
4716 // Major_version = 45, any minor_version.
4717 // Major_version >= 46 and major_version <= current_major_version and minor_version = 0.
4718 // Major_version = current_major_version and minor_version = 65535 and --enable-preview is present.
4719 //
4720 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4721 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4722 if (major != JAVA_MIN_SUPPORTED_VERSION) { // All 45.* are ok including 45.65535
4723 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4724 if (major != max_version) {
4725 ResourceMark rm(THREAD);
4726 Exceptions::fthrow(
4727 THREAD_AND_LOCATION,
4728 vmSymbols::java_lang_UnsupportedClassVersionError(),
4729 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4730 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4731 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4732 return;
4733 }
4734
4735 if (!Arguments::enable_preview()) {
4736 ResourceMark rm(THREAD);
4737 Exceptions::fthrow(
4738 THREAD_AND_LOCATION,
4739 vmSymbols::java_lang_UnsupportedClassVersionError(),
4740 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4741 class_name->as_C_string(), major, minor);
4742 return;
4743 }
4744
4745 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4746 if (major > max_version) {
4747 ResourceMark rm(THREAD);
4748 Exceptions::fthrow(
4749 THREAD_AND_LOCATION,
4750 vmSymbols::java_lang_UnsupportedClassVersionError(),
4751 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4752 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4753 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4754 } else if (major < JAVA_MIN_SUPPORTED_VERSION) {
4755 ResourceMark rm(THREAD);
4756 Exceptions::fthrow(
4757 THREAD_AND_LOCATION,
4758 vmSymbols::java_lang_UnsupportedClassVersionError(),
4759 "%s (class file version %u.%u) was compiled with an invalid major version",
4760 class_name->as_C_string(), major, minor);
4761 } else if (minor != 0) {
4762 ResourceMark rm(THREAD);
4763 Exceptions::fthrow(
4764 THREAD_AND_LOCATION,
4765 vmSymbols::java_lang_UnsupportedClassVersionError(),
4766 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4767 class_name->as_C_string(), major, minor);
4768 }
4769 }
4770 }
4771 }
4772
4773 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4774 bool is_interface,
4775 TRAPS) const {
4776 if (!_need_verify) { return; }
4777
4778 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4779 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4780 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4781 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4782 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4783 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4784 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4785 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4786 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4787
4788 bool is_illegal = false;
4789
4790 if (is_interface) {
4791 if (!is_public || !is_static || !is_final || is_private ||
4792 is_protected || is_volatile || is_transient ||
4793 (major_gte_15 && is_enum)) {
4794 is_illegal = true;
4795 }
4796 } else { // not interface
4797 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4798 is_illegal = true;
4799 }
4800 }
4801
4802 if (is_illegal) {
4803 ResourceMark rm(THREAD);
4804 Exceptions::fthrow(
4805 THREAD_AND_LOCATION,
4806 vmSymbols::java_lang_ClassFormatError(),
4807 "Illegal field modifiers in class %s: 0x%X",
4808 _class_name->as_C_string(), flags);
4809 return;
4810 }
4811 }
4812
4813 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4814 bool is_interface,
4815 const Symbol* name,
4816 TRAPS) const {
4817 if (!_need_verify) { return; }
4818
4819 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4820 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4821 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4822 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4823 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4824 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4825 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4826 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4827 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4828 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4829 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4830 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4831 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4832
4833 bool is_illegal = false;
4834
4835 if (is_interface) {
4836 if (major_gte_8) {
4837 // Class file version is JAVA_8_VERSION or later Methods of
4838 // interfaces may set any of the flags except ACC_PROTECTED,
4839 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4840 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4841 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4842 (is_native || is_protected || is_final || is_synchronized) ||
4843 // If a specific method of a class or interface has its
4844 // ACC_ABSTRACT flag set, it must not have any of its
4845 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4846 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4847 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4848 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4849 (is_abstract && (is_private || is_static || is_strict))) {
4850 is_illegal = true;
4851 }
4852 } else if (major_gte_15) {
4853 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4854 if (!is_public || is_private || is_protected || is_static || is_final ||
4855 is_synchronized || is_native || !is_abstract || is_strict) {
4856 is_illegal = true;
4857 }
4858 } else {
4859 // Class file version is pre-JAVA_1_5_VERSION
4860 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4861 is_illegal = true;
4862 }
4863 }
4864 } else { // not interface
4865 if (has_illegal_visibility(flags)) {
4866 is_illegal = true;
4867 } else {
4868 if (is_initializer) {
4869 if (is_static || is_final || is_synchronized || is_native ||
4870 is_abstract || (major_gte_15 && is_bridge)) {
4871 is_illegal = true;
4872 }
4873 } else { // not initializer
4874 if (is_abstract) {
4875 if ((is_final || is_native || is_private || is_static ||
4876 (major_gte_15 && (is_synchronized || is_strict)))) {
4877 is_illegal = true;
4878 }
4879 }
4880 }
4881 }
4882 }
4883
4884 if (is_illegal) {
4885 ResourceMark rm(THREAD);
4886 Exceptions::fthrow(
4887 THREAD_AND_LOCATION,
4888 vmSymbols::java_lang_ClassFormatError(),
4889 "Method %s in class %s has illegal modifiers: 0x%X",
4890 name->as_C_string(), _class_name->as_C_string(), flags);
4891 return;
4892 }
4893 }
4894
4895 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4896 int length,
4897 TRAPS) const {
4898 assert(_need_verify, "only called when _need_verify is true");
4899 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
4900 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4901 }
4902 }
4903
4904 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4905 // In class names, '/' separates unqualified names. This is verified in this function also.
4906 // Method names also may not contain the characters '<' or '>', unless <init>
4907 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4908 // method. Because these names have been checked as special cases before
4909 // calling this method in verify_legal_method_name.
4910 //
4911 // This method is also called from the modular system APIs in modules.cpp
4912 // to verify the validity of module and package names.
4913 bool ClassFileParser::verify_unqualified_name(const char* name,
4914 unsigned int length,
4915 int type) {
4916 for (const char* p = name; p != name + length;) {
4917 jchar ch = *p;
4918 if (ch < 128) {
4919 if (ch == '.' || ch == ';' || ch == '[' ) {
4920 return false; // do not permit '.', ';', or '['
4921 }
4922 if (ch == '/') {
4923 // check for '//' or leading or trailing '/' which are not legal
4924 // unqualified name must not be empty
4925 if (type == ClassFileParser::LegalClass) {
4926 if (p == name || p+1 >= name+length || *(p+1) == '/') {
4927 return false;
4928 }
4929 } else {
4930 return false; // do not permit '/' unless it's class name
4931 }
4932 }
4933 if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) {
4934 return false; // do not permit '<' or '>' in method names
4935 }
4936 p++;
4937 } else {
4938 char* tmp_p = UTF8::next(p, &ch);
4939 p = tmp_p;
4940 }
4941 }
4942 return true;
4943 }
4944
4945 // Take pointer to a string. Skip over the longest part of the string that could
4946 // be taken as a fieldname. Allow '/' if slash_ok is true.
4947 // Return a pointer to just past the fieldname.
4948 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4949 // being true, we saw consecutive slashes (meaning we were looking for a
4950 // qualified path but found something that was badly-formed).
4951 static const char* skip_over_field_name(const char* name,
4952 bool slash_ok,
4953 unsigned int length) {
4954 const char* p;
4955 jboolean last_is_slash = false;
4956 jboolean not_first_ch = false;
4957
4958 for (p = name; p != name + length; not_first_ch = true) {
4959 const char* old_p = p;
4960 jchar ch = *p;
4961 if (ch < 128) {
4962 p++;
4963 // quick check for ascii
4964 if ((ch >= 'a' && ch <= 'z') ||
4965 (ch >= 'A' && ch <= 'Z') ||
4966 (ch == '_' || ch == '$') ||
4967 (not_first_ch && ch >= '0' && ch <= '9')) {
4968 last_is_slash = false;
4969 continue;
4970 }
4971 if (slash_ok && ch == '/') {
4972 if (last_is_slash) {
4973 return NULL; // Don't permit consecutive slashes
4974 }
4975 last_is_slash = true;
4976 continue;
4977 }
4978 }
4979 else {
4980 jint unicode_ch;
4981 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4982 p = tmp_p;
4983 last_is_slash = false;
4984 // Check if ch is Java identifier start or is Java identifier part
4985 // 4672820: call java.lang.Character methods directly without generating separate tables.
4986 EXCEPTION_MARK;
4987
4988 // return value
4989 JavaValue result(T_BOOLEAN);
4990 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4991 JavaCallArguments args;
4992 args.push_int(unicode_ch);
4993
4994 // public static boolean isJavaIdentifierStart(char ch);
4995 JavaCalls::call_static(&result,
4996 SystemDictionary::Character_klass(),
4997 vmSymbols::isJavaIdentifierStart_name(),
4998 vmSymbols::int_bool_signature(),
4999 &args,
5000 THREAD);
5001
5002 if (HAS_PENDING_EXCEPTION) {
5003 CLEAR_PENDING_EXCEPTION;
5004 return 0;
5005 }
5006 if (result.get_jboolean()) {
5007 continue;
5008 }
5009
5010 if (not_first_ch) {
5011 // public static boolean isJavaIdentifierPart(char ch);
5012 JavaCalls::call_static(&result,
5013 SystemDictionary::Character_klass(),
5014 vmSymbols::isJavaIdentifierPart_name(),
5015 vmSymbols::int_bool_signature(),
5016 &args,
5017 THREAD);
5018
5019 if (HAS_PENDING_EXCEPTION) {
5020 CLEAR_PENDING_EXCEPTION;
5021 return 0;
5022 }
5023
5024 if (result.get_jboolean()) {
5025 continue;
5026 }
5027 }
5028 }
5029 return (not_first_ch) ? old_p : NULL;
5030 }
5031 return (not_first_ch) ? p : NULL;
5032 }
5033
5034 // Take pointer to a string. Skip over the longest part of the string that could
5035 // be taken as a field signature. Allow "void" if void_ok.
5036 // Return a pointer to just past the signature.
5037 // Return NULL if no legal signature is found.
5038 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5039 bool void_ok,
5040 unsigned int length,
5041 TRAPS) const {
5042 unsigned int array_dim = 0;
5043 while (length > 0) {
5044 switch (signature[0]) {
5045 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5046 case JVM_SIGNATURE_BOOLEAN:
5047 case JVM_SIGNATURE_BYTE:
5048 case JVM_SIGNATURE_CHAR:
5049 case JVM_SIGNATURE_SHORT:
5050 case JVM_SIGNATURE_INT:
5051 case JVM_SIGNATURE_FLOAT:
5052 case JVM_SIGNATURE_LONG:
5053 case JVM_SIGNATURE_DOUBLE:
5054 return signature + 1;
5055 case JVM_SIGNATURE_CLASS: {
5056 if (_major_version < JAVA_1_5_VERSION) {
5057 // Skip over the class name if one is there
5058 const char* const p = skip_over_field_name(signature + 1, true, --length);
5059
5060 // The next character better be a semicolon
5061 if (p && (p - signature) > 1 && p[0] == ';') {
5062 return p + 1;
5063 }
5064 }
5065 else {
5066 // Skip leading 'L' and ignore first appearance of ';'
5067 length--;
5068 signature++;
5069 char* c = strchr((char*) signature, ';');
5070 // Format check signature
5071 if (c != NULL) {
5072 ResourceMark rm(THREAD);
5073 int newlen = c - (char*) signature;
5074 char* sig = NEW_RESOURCE_ARRAY(char, newlen + 1);
5075 strncpy(sig, signature, newlen);
5076 sig[newlen] = '\0';
5077
5078 bool legal = verify_unqualified_name(sig, newlen, LegalClass);
5079 if (!legal) {
5080 classfile_parse_error("Class name contains illegal character "
5081 "in descriptor in class file %s",
5082 CHECK_0);
5083 return NULL;
5084 }
5085 return signature + newlen + 1;
5086 }
5087 }
5088 return NULL;
5089 }
5090 case JVM_SIGNATURE_ARRAY:
5091 array_dim++;
5092 if (array_dim > 255) {
5093 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5094 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5095 }
5096 // The rest of what's there better be a legal signature
5097 signature++;
5098 length--;
5099 void_ok = false;
5100 break;
5101 default:
5102 return NULL;
5103 }
5104 }
5105 return NULL;
5106 }
5107
5108 // Checks if name is a legal class name.
5109 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5110 if (!_need_verify || _relax_verify) { return; }
5111
5112 char buf[fixed_buffer_size];
5113 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5114 unsigned int length = name->utf8_length();
5115 bool legal = false;
5116
5117 if (length > 0) {
5118 const char* p;
5119 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5120 p = skip_over_field_signature(bytes, false, length, CHECK);
5121 legal = (p != NULL) && ((p - bytes) == (int)length);
5122 } else if (_major_version < JAVA_1_5_VERSION) {
5123 if (bytes[0] != '<') {
5124 p = skip_over_field_name(bytes, true, length);
5125 legal = (p != NULL) && ((p - bytes) == (int)length);
5126 }
5127 } else {
5128 // 4900761: relax the constraints based on JSR202 spec
5129 // Class names may be drawn from the entire Unicode character set.
5130 // Identifiers between '/' must be unqualified names.
5131 // The utf8 string has been verified when parsing cpool entries.
5132 legal = verify_unqualified_name(bytes, length, LegalClass);
5133 }
5134 }
5135 if (!legal) {
5136 ResourceMark rm(THREAD);
5137 assert(_class_name != NULL, "invariant");
5138 Exceptions::fthrow(
5139 THREAD_AND_LOCATION,
5140 vmSymbols::java_lang_ClassFormatError(),
5141 "Illegal class name \"%s\" in class file %s", bytes,
5142 _class_name->as_C_string()
5143 );
5144 return;
5145 }
5146 }
5147
5148 // Checks if name is a legal field name.
5149 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5150 if (!_need_verify || _relax_verify) { return; }
5151
5152 char buf[fixed_buffer_size];
5153 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5154 unsigned int length = name->utf8_length();
5155 bool legal = false;
5156
5157 if (length > 0) {
5158 if (_major_version < JAVA_1_5_VERSION) {
5159 if (bytes[0] != '<') {
5160 const char* p = skip_over_field_name(bytes, false, length);
5161 legal = (p != NULL) && ((p - bytes) == (int)length);
5162 }
5163 } else {
5164 // 4881221: relax the constraints based on JSR202 spec
5165 legal = verify_unqualified_name(bytes, length, LegalField);
5166 }
5167 }
5168
5169 if (!legal) {
5170 ResourceMark rm(THREAD);
5171 assert(_class_name != NULL, "invariant");
5172 Exceptions::fthrow(
5173 THREAD_AND_LOCATION,
5174 vmSymbols::java_lang_ClassFormatError(),
5175 "Illegal field name \"%s\" in class %s", bytes,
5176 _class_name->as_C_string()
5177 );
5178 return;
5179 }
5180 }
5181
5182 // Checks if name is a legal method name.
5183 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5184 if (!_need_verify || _relax_verify) { return; }
5185
5186 assert(name != NULL, "method name is null");
5187 char buf[fixed_buffer_size];
5188 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5189 unsigned int length = name->utf8_length();
5190 bool legal = false;
5191
5192 if (length > 0) {
5193 if (bytes[0] == '<') {
5194 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5195 legal = true;
5196 }
5197 } else if (_major_version < JAVA_1_5_VERSION) {
5198 const char* p;
5199 p = skip_over_field_name(bytes, false, length);
5200 legal = (p != NULL) && ((p - bytes) == (int)length);
5201 } else {
5202 // 4881221: relax the constraints based on JSR202 spec
5203 legal = verify_unqualified_name(bytes, length, LegalMethod);
5204 }
5205 }
5206
5207 if (!legal) {
5208 ResourceMark rm(THREAD);
5209 assert(_class_name != NULL, "invariant");
5210 Exceptions::fthrow(
5211 THREAD_AND_LOCATION,
5212 vmSymbols::java_lang_ClassFormatError(),
5213 "Illegal method name \"%s\" in class %s", bytes,
5214 _class_name->as_C_string()
5215 );
5216 return;
5217 }
5218 }
5219
5220
5221 // Checks if signature is a legal field signature.
5222 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5223 const Symbol* signature,
5224 TRAPS) const {
5225 if (!_need_verify) { return; }
5226
5227 char buf[fixed_buffer_size];
5228 const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5229 const unsigned int length = signature->utf8_length();
5230 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5231
5232 if (p == NULL || (p - bytes) != (int)length) {
5233 throwIllegalSignature("Field", name, signature, CHECK);
5234 }
5235 }
5236
5237 // Checks if signature is a legal method signature.
5238 // Returns number of parameters
5239 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5240 const Symbol* signature,
5241 TRAPS) const {
5242 if (!_need_verify) {
5243 // make sure caller's args_size will be less than 0 even for non-static
5244 // method so it will be recomputed in compute_size_of_parameters().
5245 return -2;
5246 }
5247
5248 // Class initializers cannot have args for class format version >= 51.
5249 if (name == vmSymbols::class_initializer_name() &&
5250 signature != vmSymbols::void_method_signature() &&
5251 _major_version >= JAVA_7_VERSION) {
5252 throwIllegalSignature("Method", name, signature, CHECK_0);
5253 return 0;
5254 }
5255
5256 unsigned int args_size = 0;
5257 char buf[fixed_buffer_size];
5258 const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5259 unsigned int length = signature->utf8_length();
5260 const char* nextp;
5261
5262 // The first character must be a '('
5263 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5264 length--;
5265 // Skip over legal field signatures
5266 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5267 while ((length > 0) && (nextp != NULL)) {
5268 args_size++;
5269 if (p[0] == 'J' || p[0] == 'D') {
5270 args_size++;
5271 }
5272 length -= nextp - p;
5273 p = nextp;
5274 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5275 }
5276 // The first non-signature thing better be a ')'
5277 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5278 length--;
5279 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5280 // All internal methods must return void
5281 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5282 return args_size;
5283 }
5284 } else {
5285 // Now we better just have a return value
5286 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5287 if (nextp && ((int)length == (nextp - p))) {
5288 return args_size;
5289 }
5290 }
5291 }
5292 }
5293 // Report error
5294 throwIllegalSignature("Method", name, signature, CHECK_0);
5295 return 0;
5296 }
5297
5298 int ClassFileParser::static_field_size() const {
5299 assert(_field_info != NULL, "invariant");
5300 return _field_info->static_field_size;
5301 }
5302
5303 int ClassFileParser::total_oop_map_count() const {
5304 assert(_field_info != NULL, "invariant");
5305 return _field_info->total_oop_map_count;
5306 }
5307
5308 jint ClassFileParser::layout_size() const {
5309 assert(_field_info != NULL, "invariant");
5310 return _field_info->instance_size;
5311 }
5312
5313 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5314 const Array<Method*>* methods) {
5315 assert(ik != NULL, "invariant");
5316 assert(methods != NULL, "invariant");
5317
5318 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5319 // (We used to do this lazily, but now we query it in Rewriter,
5320 // which is eagerly done for every method, so we might as well do it now,
5321 // when everything is fresh in memory.)
5322 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5323
5324 if (klass_id != vmSymbols::NO_SID) {
5325 for (int j = 0; j < methods->length(); ++j) {
5326 Method* method = methods->at(j);
5327 method->init_intrinsic_id();
5328
5329 if (CheckIntrinsics) {
5330 // Check if an intrinsic is defined for method 'method',
5331 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5332 if (method->intrinsic_id() != vmIntrinsics::_none &&
5333 !method->intrinsic_candidate()) {
5334 tty->print("Compiler intrinsic is defined for method [%s], "
5335 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5336 method->name_and_sig_as_C_string(),
5337 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5338 );
5339 tty->cr();
5340 DEBUG_ONLY(vm_exit(1));
5341 }
5342 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5343 // but there is no intrinsic available for it.
5344 if (method->intrinsic_candidate() &&
5345 method->intrinsic_id() == vmIntrinsics::_none) {
5346 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5347 "but no compiler intrinsic is defined for the method.%s",
5348 method->name_and_sig_as_C_string(),
5349 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5350 );
5351 tty->cr();
5352 DEBUG_ONLY(vm_exit(1));
5353 }
5354 }
5355 } // end for
5356
5357 #ifdef ASSERT
5358 if (CheckIntrinsics) {
5359 // Check for orphan methods in the current class. A method m
5360 // of a class C is orphan if an intrinsic is defined for method m,
5361 // but class C does not declare m.
5362 // The check is potentially expensive, therefore it is available
5363 // only in debug builds.
5364
5365 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5366 if (vmIntrinsics::_compiledLambdaForm == id) {
5367 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5368 // generated for the JVM from a LambdaForm and therefore no method
5369 // is defined for it.
5370 continue;
5371 }
5372
5373 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5374 // Check if the current class contains a method with the same
5375 // name, flags, signature.
5376 bool match = false;
5377 for (int j = 0; j < methods->length(); ++j) {
5378 const Method* method = methods->at(j);
5379 if (method->intrinsic_id() == id) {
5380 match = true;
5381 break;
5382 }
5383 }
5384
5385 if (!match) {
5386 char buf[1000];
5387 tty->print("Compiler intrinsic is defined for method [%s], "
5388 "but the method is not available in class [%s].%s",
5389 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5390 buf, sizeof(buf)),
5391 ik->name()->as_C_string(),
5392 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5393 );
5394 tty->cr();
5395 DEBUG_ONLY(vm_exit(1));
5396 }
5397 }
5398 } // end for
5399 } // CheckIntrinsics
5400 #endif // ASSERT
5401 }
5402 }
5403
5404 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5405 if (_klass != NULL) {
5406 return _klass;
5407 }
5408
5409 InstanceKlass* const ik =
5410 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5411
5412 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5413
5414 assert(_klass == ik, "invariant");
5415
5416 ik->set_has_passed_fingerprint_check(false);
5417 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5418 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5419 if (aot_fp != 0 && aot_fp == _stream->compute_fingerprint()) {
5420 // This class matches with a class saved in an AOT library
5421 ik->set_has_passed_fingerprint_check(true);
5422 } else {
5423 ResourceMark rm;
5424 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5425 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5426 }
5427 }
5428
5429 return ik;
5430 }
5431
5432 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5433 assert(ik != NULL, "invariant");
5434
5435 // Set name and CLD before adding to CLD
5436 ik->set_class_loader_data(_loader_data);
5437 ik->set_name(_class_name);
5438
5439 // Add all classes to our internal class loader list here,
5440 // including classes in the bootstrap (NULL) class loader.
5441 const bool publicize = !is_internal();
5442
5443 _loader_data->add_class(ik, publicize);
5444
5445 set_klass_to_deallocate(ik);
5446
5447 assert(_field_info != NULL, "invariant");
5448 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5449 assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count,
5450 "sanity");
5451
5452 assert(ik->is_instance_klass(), "sanity");
5453 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5454
5455 // Fill in information already parsed
5456 ik->set_should_verify_class(_need_verify);
5457
5458 // Not yet: supers are done below to support the new subtype-checking fields
5459 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5460 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5461 assert(_fac != NULL, "invariant");
5462 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5463
5464 // this transfers ownership of a lot of arrays from
5465 // the parser onto the InstanceKlass*
5466 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5467
5468 // note that is not safe to use the fields in the parser from this point on
5469 assert(NULL == _cp, "invariant");
5470 assert(NULL == _fields, "invariant");
5471 assert(NULL == _methods, "invariant");
5472 assert(NULL == _inner_classes, "invariant");
5473 assert(NULL == _local_interfaces, "invariant");
5474 assert(NULL == _combined_annotations, "invariant");
5475
5476 if (_has_final_method) {
5477 ik->set_has_final_method();
5478 }
5479
5480 ik->copy_method_ordering(_method_ordering, CHECK);
5481 // The InstanceKlass::_methods_jmethod_ids cache
5482 // is managed on the assumption that the initial cache
5483 // size is equal to the number of methods in the class. If
5484 // that changes, then InstanceKlass::idnum_can_increment()
5485 // has to be changed accordingly.
5486 ik->set_initial_method_idnum(ik->methods()->length());
5487
5488 ik->set_this_class_index(_this_class_index);
5489
5490 if (is_anonymous()) {
5491 // _this_class_index is a CONSTANT_Class entry that refers to this
5492 // anonymous class itself. If this class needs to refer to its own methods or
5493 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5494 // _this_class_index. However, because this class is anonymous (it's
5495 // not stored in SystemDictionary), _this_class_index cannot be resolved
5496 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5497 // Therefore, we must eagerly resolve _this_class_index now.
5498 ik->constants()->klass_at_put(_this_class_index, ik);
5499 }
5500
5501 ik->set_minor_version(_minor_version);
5502 ik->set_major_version(_major_version);
5503 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5504 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5505
5506 if (_host_klass != NULL) {
5507 assert (ik->is_anonymous(), "should be the same");
5508 ik->set_host_klass(_host_klass);
5509 }
5510
5511 // Set PackageEntry for this_klass
5512 oop cl = ik->class_loader();
5513 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5514 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5515 ik->set_package(cld, CHECK);
5516
5517 const Array<Method*>* const methods = ik->methods();
5518 assert(methods != NULL, "invariant");
5519 const int methods_len = methods->length();
5520
5521 check_methods_for_intrinsics(ik, methods);
5522
5523 // Fill in field values obtained by parse_classfile_attributes
5524 if (_parsed_annotations->has_any_annotations()) {
5525 _parsed_annotations->apply_to(ik);
5526 }
5527
5528 apply_parsed_class_attributes(ik);
5529
5530 // Miranda methods
5531 if ((_num_miranda_methods > 0) ||
5532 // if this class introduced new miranda methods or
5533 (_super_klass != NULL && _super_klass->has_miranda_methods())
5534 // super class exists and this class inherited miranda methods
5535 ) {
5536 ik->set_has_miranda_methods(); // then set a flag
5537 }
5538
5539 // Fill in information needed to compute superclasses.
5540 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5541 ik->set_transitive_interfaces(_transitive_interfaces);
5542 _transitive_interfaces = NULL;
5543
5544 // Initialize itable offset tables
5545 klassItable::setup_itable_offset_table(ik);
5546
5547 // Compute transitive closure of interfaces this class implements
5548 // Do final class setup
5549 fill_oop_maps(ik,
5550 _field_info->nonstatic_oop_map_count,
5551 _field_info->nonstatic_oop_offsets,
5552 _field_info->nonstatic_oop_counts);
5553
5554 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5555 set_precomputed_flags(ik);
5556
5557 // check if this class can access its super class
5558 check_super_class_access(ik, CHECK);
5559
5560 // check if this class can access its superinterfaces
5561 check_super_interface_access(ik, CHECK);
5562
5563 // check if this class overrides any final method
5564 check_final_method_override(ik, CHECK);
5565
5566 // reject static interface methods prior to Java 8
5567 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5568 check_illegal_static_method(ik, CHECK);
5569 }
5570
5571 // Obtain this_klass' module entry
5572 ModuleEntry* module_entry = ik->module();
5573 assert(module_entry != NULL, "module_entry should always be set");
5574
5575 // Obtain java.lang.Module
5576 Handle module_handle(THREAD, module_entry->module());
5577
5578 // Allocate mirror and initialize static fields
5579 // The create_mirror() call will also call compute_modifiers()
5580 java_lang_Class::create_mirror(ik,
5581 Handle(THREAD, _loader_data->class_loader()),
5582 module_handle,
5583 _protection_domain,
5584 CHECK);
5585
5586 assert(_all_mirandas != NULL, "invariant");
5587
5588 // Generate any default methods - default methods are public interface methods
5589 // that have a default implementation. This is new with Java 8.
5590 if (_has_nonstatic_concrete_methods) {
5591 DefaultMethods::generate_default_methods(ik,
5592 _all_mirandas,
5593 CHECK);
5594 }
5595
5596 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5597 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5598 !module_entry->has_default_read_edges()) {
5599 if (!module_entry->set_has_default_read_edges()) {
5600 // We won a potential race
5601 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5602 }
5603 }
5604
5605 // Update the loader_data graph.
5606 record_defined_class_dependencies(ik, CHECK);
5607
5608 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5609
5610 if (!is_internal()) {
5611 if (log_is_enabled(Info, class, load)) {
5612 ResourceMark rm;
5613 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5614 ik->print_class_load_logging(_loader_data, module_name, _stream);
5615 }
5616
5617 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5618 ik->major_version() != JAVA_MIN_SUPPORTED_VERSION &&
5619 log_is_enabled(Info, class, preview)) {
5620 ResourceMark rm;
5621 log_info(class, preview)("Loading preview feature type %s", ik->external_name());
5622 }
5623
5624 if (log_is_enabled(Debug, class, resolve)) {
5625 ResourceMark rm;
5626 // print out the superclass.
5627 const char * from = ik->external_name();
5628 if (ik->java_super() != NULL) {
5629 log_debug(class, resolve)("%s %s (super)",
5630 from,
5631 ik->java_super()->external_name());
5632 }
5633 // print out each of the interface classes referred to by this class.
5634 const Array<Klass*>* const local_interfaces = ik->local_interfaces();
5635 if (local_interfaces != NULL) {
5636 const int length = local_interfaces->length();
5637 for (int i = 0; i < length; i++) {
5638 const Klass* const k = local_interfaces->at(i);
5639 const char * to = k->external_name();
5640 log_debug(class, resolve)("%s %s (interface)", from, to);
5641 }
5642 }
5643 }
5644 }
5645
5646 JFR_ONLY(INIT_ID(ik);)
5647
5648 // If we reach here, all is well.
5649 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5650 // in order for it to not be destroyed in the ClassFileParser destructor.
5651 set_klass_to_deallocate(NULL);
5652
5653 // it's official
5654 set_klass(ik);
5655
5656 debug_only(ik->verify();)
5657 }
5658
5659 // For an anonymous class that is in the unnamed package, move it to its host class's
5660 // package by prepending its host class's package name to its class name and setting
5661 // its _class_name field.
5662 void ClassFileParser::prepend_host_package_name(const InstanceKlass* host_klass, TRAPS) {
5663 ResourceMark rm(THREAD);
5664 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
5665 "Anonymous class should not be in a package");
5666 const char* host_pkg_name =
5667 ClassLoader::package_from_name(host_klass->name()->as_C_string(), NULL);
5668
5669 if (host_pkg_name != NULL) {
5670 size_t host_pkg_len = strlen(host_pkg_name);
5671 int class_name_len = _class_name->utf8_length();
5672 char* new_anon_name =
5673 NEW_RESOURCE_ARRAY(char, host_pkg_len + 1 + class_name_len);
5674 // Copy host package name and trailing /.
5675 strncpy(new_anon_name, host_pkg_name, host_pkg_len);
5676 new_anon_name[host_pkg_len] = '/';
5677 // Append anonymous class name. The anonymous class name can contain odd
5678 // characters. So, do a strncpy instead of using sprintf("%s...").
5679 strncpy(new_anon_name + host_pkg_len + 1, (char *)_class_name->base(), class_name_len);
5680
5681 // Create a symbol and update the anonymous class name.
5682 _class_name = SymbolTable::new_symbol(new_anon_name,
5683 (int)host_pkg_len + 1 + class_name_len,
5684 CHECK);
5685 }
5686 }
5687
5688 // If the host class and the anonymous class are in the same package then do
5689 // nothing. If the anonymous class is in the unnamed package then move it to its
5690 // host's package. If the classes are in different packages then throw an IAE
5691 // exception.
5692 void ClassFileParser::fix_anonymous_class_name(TRAPS) {
5693 assert(_host_klass != NULL, "Expected an anonymous class");
5694
5695 const jbyte* anon_last_slash = UTF8::strrchr(_class_name->base(),
5696 _class_name->utf8_length(), '/');
5697 if (anon_last_slash == NULL) { // Unnamed package
5698 prepend_host_package_name(_host_klass, CHECK);
5699 } else {
5700 if (!_host_klass->is_same_class_package(_host_klass->class_loader(), _class_name)) {
5701 ResourceMark rm(THREAD);
5702 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
5703 err_msg("Host class %s and anonymous class %s are in different packages",
5704 _host_klass->name()->as_C_string(), _class_name->as_C_string()));
5705 }
5706 }
5707 }
5708
5709 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5710 bool trusted = (loader_data->is_the_null_class_loader_data() ||
5711 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
5712 bool need_verify =
5713 // verifyAll
5714 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5715 // verifyRemote
5716 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5717 return !need_verify;
5718 }
5719
5720 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5721 Symbol* name,
5722 ClassLoaderData* loader_data,
5723 Handle protection_domain,
5724 const InstanceKlass* host_klass,
5725 GrowableArray<Handle>* cp_patches,
5726 Publicity pub_level,
5727 TRAPS) :
5728 _stream(stream),
5729 _requested_name(name),
5730 _loader_data(loader_data),
5731 _host_klass(host_klass),
5732 _cp_patches(cp_patches),
5733 _num_patched_klasses(0),
5734 _max_num_patched_klasses(0),
5735 _orig_cp_size(0),
5736 _first_patched_klass_resolved_index(0),
5737 _super_klass(),
5738 _cp(NULL),
5739 _fields(NULL),
5740 _methods(NULL),
5741 _inner_classes(NULL),
5742 _local_interfaces(NULL),
5743 _transitive_interfaces(NULL),
5744 _combined_annotations(NULL),
5745 _annotations(NULL),
5746 _type_annotations(NULL),
5747 _fields_annotations(NULL),
5748 _fields_type_annotations(NULL),
5749 _klass(NULL),
5750 _klass_to_deallocate(NULL),
5751 _parsed_annotations(NULL),
5752 _fac(NULL),
5753 _field_info(NULL),
5754 _method_ordering(NULL),
5755 _all_mirandas(NULL),
5756 _vtable_size(0),
5757 _itable_size(0),
5758 _num_miranda_methods(0),
5759 _rt(REF_NONE),
5760 _protection_domain(protection_domain),
5761 _access_flags(),
5762 _pub_level(pub_level),
5763 _bad_constant_seen(0),
5764 _synthetic_flag(false),
5765 _sde_length(false),
5766 _sde_buffer(NULL),
5767 _sourcefile_index(0),
5768 _generic_signature_index(0),
5769 _major_version(0),
5770 _minor_version(0),
5771 _this_class_index(0),
5772 _super_class_index(0),
5773 _itfs_len(0),
5774 _java_fields_count(0),
5775 _need_verify(false),
5776 _relax_verify(false),
5777 _has_nonstatic_concrete_methods(false),
5778 _declares_nonstatic_concrete_methods(false),
5779 _has_final_method(false),
5780 _has_finalizer(false),
5781 _has_empty_finalizer(false),
5782 _has_vanilla_constructor(false),
5783 _max_bootstrap_specifier_index(-1) {
5784
5785 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
5786
5787 assert(THREAD->is_Java_thread(), "invariant");
5788 assert(_loader_data != NULL, "invariant");
5789 assert(stream != NULL, "invariant");
5790 assert(_stream != NULL, "invariant");
5791 assert(_stream->buffer() == _stream->current(), "invariant");
5792 assert(_class_name != NULL, "invariant");
5793 assert(0 == _access_flags.as_int(), "invariant");
5794
5795 // Figure out whether we can skip format checking (matching classic VM behavior)
5796 if (DumpSharedSpaces) {
5797 // verify == true means it's a 'remote' class (i.e., non-boot class)
5798 // Verification decision is based on BytecodeVerificationRemote flag
5799 // for those classes.
5800 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
5801 BytecodeVerificationLocal;
5802 }
5803 else {
5804 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
5805 stream->need_verify());
5806 }
5807 if (_cp_patches != NULL) {
5808 int len = _cp_patches->length();
5809 for (int i=0; i<len; i++) {
5810 if (has_cp_patch_at(i)) {
5811 Handle patch = cp_patch_at(i);
5812 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
5813 // We need to append the names of the patched classes to the end of the constant pool,
5814 // because a patched class may have a Utf8 name that's not already included in the
5815 // original constant pool. These class names are used when patch_constant_pool()
5816 // calls patch_class().
5817 //
5818 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
5819 // At this point, we don't know the tag for index i yet, because we haven't parsed the
5820 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
5821 _max_num_patched_klasses++;
5822 }
5823 }
5824 }
5825 }
5826
5827 // synch back verification state to stream
5828 stream->set_verify(_need_verify);
5829
5830 // Check if verification needs to be relaxed for this class file
5831 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
5832 _relax_verify = relax_format_check_for(_loader_data);
5833
5834 parse_stream(stream, CHECK);
5835
5836 post_process_parsed_stream(stream, _cp, CHECK);
5837 }
5838
5839 void ClassFileParser::clear_class_metadata() {
5840 // metadata created before the instance klass is created. Must be
5841 // deallocated if classfile parsing returns an error.
5842 _cp = NULL;
5843 _fields = NULL;
5844 _methods = NULL;
5845 _inner_classes = NULL;
5846 _local_interfaces = NULL;
5847 _combined_annotations = NULL;
5848 _annotations = _type_annotations = NULL;
5849 _fields_annotations = _fields_type_annotations = NULL;
5850 }
5851
5852 // Destructor to clean up
5853 ClassFileParser::~ClassFileParser() {
5854 if (_cp != NULL) {
5855 MetadataFactory::free_metadata(_loader_data, _cp);
5856 }
5857 if (_fields != NULL) {
5858 MetadataFactory::free_array<u2>(_loader_data, _fields);
5859 }
5860
5861 if (_methods != NULL) {
5862 // Free methods
5863 InstanceKlass::deallocate_methods(_loader_data, _methods);
5864 }
5865
5866 // beware of the Universe::empty_blah_array!!
5867 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
5868 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5869 }
5870
5871 // Free interfaces
5872 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5873 _local_interfaces, _transitive_interfaces);
5874
5875 if (_combined_annotations != NULL) {
5876 // After all annotations arrays have been created, they are installed into the
5877 // Annotations object that will be assigned to the InstanceKlass being created.
5878
5879 // Deallocate the Annotations object and the installed annotations arrays.
5880 _combined_annotations->deallocate_contents(_loader_data);
5881
5882 // If the _combined_annotations pointer is non-NULL,
5883 // then the other annotations fields should have been cleared.
5884 assert(_annotations == NULL, "Should have been cleared");
5885 assert(_type_annotations == NULL, "Should have been cleared");
5886 assert(_fields_annotations == NULL, "Should have been cleared");
5887 assert(_fields_type_annotations == NULL, "Should have been cleared");
5888 } else {
5889 // If the annotations arrays were not installed into the Annotations object,
5890 // then they have to be deallocated explicitly.
5891 MetadataFactory::free_array<u1>(_loader_data, _annotations);
5892 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
5893 Annotations::free_contents(_loader_data, _fields_annotations);
5894 Annotations::free_contents(_loader_data, _fields_type_annotations);
5895 }
5896
5897 clear_class_metadata();
5898 _transitive_interfaces = NULL;
5899
5900 // deallocate the klass if already created. Don't directly deallocate, but add
5901 // to the deallocate list so that the klass is removed from the CLD::_klasses list
5902 // at a safepoint.
5903 if (_klass_to_deallocate != NULL) {
5904 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5905 }
5906 }
5907
5908 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5909 TRAPS) {
5910
5911 assert(stream != NULL, "invariant");
5912 assert(_class_name != NULL, "invariant");
5913
5914 // BEGIN STREAM PARSING
5915 stream->guarantee_more(8, CHECK); // magic, major, minor
5916 // Magic value
5917 const u4 magic = stream->get_u4_fast();
5918 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5919 "Incompatible magic value %u in class file %s",
5920 magic, CHECK);
5921
5922 // Version numbers
5923 _minor_version = stream->get_u2_fast();
5924 _major_version = stream->get_u2_fast();
5925
5926 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) {
5927 ResourceMark rm;
5928 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
5929 _major_version, _minor_version, _class_name->as_C_string());
5930 Exceptions::fthrow(
5931 THREAD_AND_LOCATION,
5932 vmSymbols::java_lang_UnsupportedClassVersionError(),
5933 "Unsupported major.minor version for dump time %u.%u",
5934 _major_version,
5935 _minor_version);
5936 }
5937
5938 // Check version numbers - we check this even with verifier off
5939 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
5940
5941 stream->guarantee_more(3, CHECK); // length, first cp tag
5942 u2 cp_size = stream->get_u2_fast();
5943
5944 guarantee_property(
5945 cp_size >= 1, "Illegal constant pool size %u in class file %s",
5946 cp_size, CHECK);
5947
5948 _orig_cp_size = cp_size;
5949 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
5950 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
5951 }
5952 cp_size += _max_num_patched_klasses;
5953
5954 _cp = ConstantPool::allocate(_loader_data,
5955 cp_size,
5956 CHECK);
5957
5958 ConstantPool* const cp = _cp;
5959
5960 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5961
5962 assert(cp_size == (const u2)cp->length(), "invariant");
5963
5964 // ACCESS FLAGS
5965 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5966
5967 // Access flags
5968 jint flags;
5969 // JVM_ACC_MODULE is defined in JDK-9 and later.
5970 if (_major_version >= JAVA_9_VERSION) {
5971 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5972 } else {
5973 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5974 }
5975
5976 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5977 // Set abstract bit for old class files for backward compatibility
5978 flags |= JVM_ACC_ABSTRACT;
5979 }
5980
5981 verify_legal_class_modifiers(flags, CHECK);
5982
5983 short bad_constant = class_bad_constant_seen();
5984 if (bad_constant != 0) {
5985 // Do not throw CFE until after the access_flags are checked because if
5986 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5987 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
5988 }
5989
5990 _access_flags.set_flags(flags);
5991
5992 // This class and superclass
5993 _this_class_index = stream->get_u2_fast();
5994 check_property(
5995 valid_cp_range(_this_class_index, cp_size) &&
5996 cp->tag_at(_this_class_index).is_unresolved_klass(),
5997 "Invalid this class index %u in constant pool in class file %s",
5998 _this_class_index, CHECK);
5999
6000 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6001 assert(class_name_in_cp != NULL, "class_name can't be null");
6002
6003 // Update _class_name which could be null previously
6004 // to reflect the name in the constant pool
6005 _class_name = class_name_in_cp;
6006
6007 // Don't need to check whether this class name is legal or not.
6008 // It has been checked when constant pool is parsed.
6009 // However, make sure it is not an array type.
6010 if (_need_verify) {
6011 guarantee_property(_class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
6012 "Bad class name in class file %s",
6013 CHECK);
6014 }
6015
6016 // Checks if name in class file matches requested name
6017 if (_requested_name != NULL && _requested_name != _class_name) {
6018 ResourceMark rm(THREAD);
6019 Exceptions::fthrow(
6020 THREAD_AND_LOCATION,
6021 vmSymbols::java_lang_NoClassDefFoundError(),
6022 "%s (wrong name: %s)",
6023 _class_name->as_C_string(),
6024 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6025 );
6026 return;
6027 }
6028
6029 // if this is an anonymous class fix up its name if it's in the unnamed
6030 // package. Otherwise, throw IAE if it is in a different package than
6031 // its host class.
6032 if (_host_klass != NULL) {
6033 fix_anonymous_class_name(CHECK);
6034 }
6035
6036 // Verification prevents us from creating names with dots in them, this
6037 // asserts that that's the case.
6038 assert(is_internal_format(_class_name), "external class name format used internally");
6039
6040 if (!is_internal()) {
6041 LogTarget(Debug, class, preorder) lt;
6042 if (lt.is_enabled()){
6043 ResourceMark rm(THREAD);
6044 LogStream ls(lt);
6045 ls.print("%s", _class_name->as_klass_external_name());
6046 if (stream->source() != NULL) {
6047 ls.print(" source: %s", stream->source());
6048 }
6049 ls.cr();
6050 }
6051
6052 #if INCLUDE_CDS
6053 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6054 if (!ClassLoader::has_jrt_entry()) {
6055 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6056 DumpLoadedClassList = NULL;
6057 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6058 _host_klass == NULL) {
6059 // Only dump the classes that can be stored into CDS archive.
6060 // Anonymous classes such as generated LambdaForm classes are also not included.
6061 oop class_loader = _loader_data->class_loader();
6062 ResourceMark rm(THREAD);
6063 bool skip = false;
6064 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6065 // For the boot and platform class loaders, skip classes that are not found in the
6066 // java runtime image, such as those found in the --patch-module entries.
6067 // These classes can't be loaded from the archive during runtime.
6068 if (!ClassLoader::is_modules_image(stream->source()) && strncmp(stream->source(), "jrt:", 4) != 0) {
6069 skip = true;
6070 }
6071
6072 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6073 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6074 // as they can be loaded from the archive during runtime.
6075 skip = false;
6076 }
6077 }
6078 if (skip) {
6079 tty->print_cr("skip writing class %s from source %s to classlist file",
6080 _class_name->as_C_string(), stream->source());
6081 } else {
6082 classlist_file->print_cr("%s", _class_name->as_C_string());
6083 classlist_file->flush();
6084 }
6085 }
6086 }
6087 #endif
6088 }
6089
6090 // SUPERKLASS
6091 _super_class_index = stream->get_u2_fast();
6092 _super_klass = parse_super_class(cp,
6093 _super_class_index,
6094 _need_verify,
6095 CHECK);
6096
6097 // Interfaces
6098 _itfs_len = stream->get_u2_fast();
6099 parse_interfaces(stream,
6100 _itfs_len,
6101 cp,
6102 &_has_nonstatic_concrete_methods,
6103 CHECK);
6104
6105 assert(_local_interfaces != NULL, "invariant");
6106
6107 // Fields (offsets are filled in later)
6108 _fac = new FieldAllocationCount();
6109 parse_fields(stream,
6110 _access_flags.is_interface(),
6111 _fac,
6112 cp,
6113 cp_size,
6114 &_java_fields_count,
6115 CHECK);
6116
6117 assert(_fields != NULL, "invariant");
6118
6119 // Methods
6120 AccessFlags promoted_flags;
6121 parse_methods(stream,
6122 _access_flags.is_interface(),
6123 &promoted_flags,
6124 &_has_final_method,
6125 &_declares_nonstatic_concrete_methods,
6126 CHECK);
6127
6128 assert(_methods != NULL, "invariant");
6129
6130 // promote flags from parse_methods() to the klass' flags
6131 _access_flags.add_promoted_flags(promoted_flags.as_int());
6132
6133 if (_declares_nonstatic_concrete_methods) {
6134 _has_nonstatic_concrete_methods = true;
6135 }
6136
6137 // Additional attributes/annotations
6138 _parsed_annotations = new ClassAnnotationCollector();
6139 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6140
6141 assert(_inner_classes != NULL, "invariant");
6142
6143 // Finalize the Annotations metadata object,
6144 // now that all annotation arrays have been created.
6145 create_combined_annotations(CHECK);
6146
6147 // Make sure this is the end of class file stream
6148 guarantee_property(stream->at_eos(),
6149 "Extra bytes at the end of class file %s",
6150 CHECK);
6151
6152 // all bytes in stream read and parsed
6153 }
6154
6155 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6156 ConstantPool* cp,
6157 TRAPS) {
6158 assert(stream != NULL, "invariant");
6159 assert(stream->at_eos(), "invariant");
6160 assert(cp != NULL, "invariant");
6161 assert(_loader_data != NULL, "invariant");
6162
6163 if (_class_name == vmSymbols::java_lang_Object()) {
6164 check_property(_local_interfaces == Universe::the_empty_klass_array(),
6165 "java.lang.Object cannot implement an interface in class file %s",
6166 CHECK);
6167 }
6168 // We check super class after class file is parsed and format is checked
6169 if (_super_class_index > 0 && NULL ==_super_klass) {
6170 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6171 if (_access_flags.is_interface()) {
6172 // Before attempting to resolve the superclass, check for class format
6173 // errors not checked yet.
6174 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6175 "Interfaces must have java.lang.Object as superclass in class file %s",
6176 CHECK);
6177 }
6178 Handle loader(THREAD, _loader_data->class_loader());
6179 _super_klass = (const InstanceKlass*)
6180 SystemDictionary::resolve_super_or_fail(_class_name,
6181 super_class_name,
6182 loader,
6183 _protection_domain,
6184 true,
6185 CHECK);
6186 }
6187
6188 if (_super_klass != NULL) {
6189 if (_super_klass->has_nonstatic_concrete_methods()) {
6190 _has_nonstatic_concrete_methods = true;
6191 }
6192
6193 if (_super_klass->is_interface()) {
6194 ResourceMark rm(THREAD);
6195 Exceptions::fthrow(
6196 THREAD_AND_LOCATION,
6197 vmSymbols::java_lang_IncompatibleClassChangeError(),
6198 "class %s has interface %s as super class",
6199 _class_name->as_klass_external_name(),
6200 _super_klass->external_name()
6201 );
6202 return;
6203 }
6204 // Make sure super class is not final
6205 if (_super_klass->is_final()) {
6206 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6207 }
6208 }
6209
6210 // Compute the transitive list of all unique interfaces implemented by this class
6211 _transitive_interfaces =
6212 compute_transitive_interfaces(_super_klass,
6213 _local_interfaces,
6214 _loader_data,
6215 CHECK);
6216
6217 assert(_transitive_interfaces != NULL, "invariant");
6218
6219 // sort methods
6220 _method_ordering = sort_methods(_methods);
6221
6222 _all_mirandas = new GrowableArray<Method*>(20);
6223
6224 Handle loader(THREAD, _loader_data->class_loader());
6225 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6226 &_num_miranda_methods,
6227 _all_mirandas,
6228 _super_klass,
6229 _methods,
6230 _access_flags,
6231 _major_version,
6232 loader,
6233 _class_name,
6234 _local_interfaces,
6235 CHECK);
6236
6237 // Size of Java itable (in words)
6238 _itable_size = _access_flags.is_interface() ? 0 :
6239 klassItable::compute_itable_size(_transitive_interfaces);
6240
6241 assert(_fac != NULL, "invariant");
6242 assert(_parsed_annotations != NULL, "invariant");
6243
6244 _field_info = new FieldLayoutInfo();
6245 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6246
6247 // Compute reference typ
6248 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6249
6250 }
6251
6252 void ClassFileParser::set_klass(InstanceKlass* klass) {
6253
6254 #ifdef ASSERT
6255 if (klass != NULL) {
6256 assert(NULL == _klass, "leaking?");
6257 }
6258 #endif
6259
6260 _klass = klass;
6261 }
6262
6263 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6264
6265 #ifdef ASSERT
6266 if (klass != NULL) {
6267 assert(NULL == _klass_to_deallocate, "leaking?");
6268 }
6269 #endif
6270
6271 _klass_to_deallocate = klass;
6272 }
6273
6274 // Caller responsible for ResourceMark
6275 // clone stream with rewound position
6276 const ClassFileStream* ClassFileParser::clone_stream() const {
6277 assert(_stream != NULL, "invariant");
6278
6279 return _stream->clone();
6280 }
6281 // ----------------------------------------------------------------------------
6282 // debugging
6283
6284 #ifdef ASSERT
6285
6286 // return true if class_name contains no '.' (internal format is '/')
6287 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6288 if (class_name != NULL) {
6289 ResourceMark rm;
6290 char* name = class_name->as_C_string();
6291 return strchr(name, '.') == NULL;
6292 } else {
6293 return true;
6294 }
6295 }
6296
6297 #endif