1 /*
2 * Copyright (c) 1997, 2019, 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/packageEntry.hpp"
36 #include "classfile/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/verificationType.hpp"
39 #include "classfile/verifier.hpp"
40 #include "classfile/vmSymbols.hpp"
41 #include "logging/log.hpp"
42 #include "logging/logStream.hpp"
43 #include "memory/allocation.hpp"
44 #include "memory/metadataFactory.hpp"
45 #include "memory/oopFactory.hpp"
46 #include "memory/resourceArea.hpp"
47 #include "memory/universe.hpp"
48 #include "oops/annotations.hpp"
49 #include "oops/constantPool.inline.hpp"
50 #include "oops/fieldStreams.hpp"
51 #include "oops/instanceKlass.hpp"
52 #include "oops/instanceMirrorKlass.hpp"
53 #include "oops/klass.inline.hpp"
54 #include "oops/klassVtable.hpp"
55 #include "oops/metadata.hpp"
56 #include "oops/method.inline.hpp"
57 #include "oops/oop.inline.hpp"
58 #include "oops/symbol.hpp"
59 #include "oops/valueKlass.hpp"
60 #include "prims/jvmtiExport.hpp"
61 #include "prims/jvmtiThreadState.hpp"
62 #include "runtime/arguments.hpp"
63 #include "runtime/handles.inline.hpp"
64 #include "runtime/javaCalls.hpp"
65 #include "runtime/os.hpp"
66 #include "runtime/perfData.hpp"
67 #include "runtime/reflection.hpp"
68 #include "runtime/safepointVerifiers.hpp"
69 #include "runtime/signature.hpp"
70 #include "runtime/timer.hpp"
71 #include "services/classLoadingService.hpp"
72 #include "services/threadService.hpp"
73 #include "utilities/align.hpp"
74 #include "utilities/bitMap.inline.hpp"
75 #include "utilities/copy.hpp"
76 #include "utilities/exceptions.hpp"
77 #include "utilities/globalDefinitions.hpp"
78 #include "utilities/growableArray.hpp"
79 #include "utilities/macros.hpp"
80 #include "utilities/ostream.hpp"
81 #include "utilities/resourceHash.hpp"
82 #include "utilities/utf8.hpp"
83
84 #if INCLUDE_CDS
85 #include "classfile/systemDictionaryShared.hpp"
86 #endif
87 #if INCLUDE_JFR
88 #include "jfr/support/jfrTraceIdExtension.hpp"
89 #endif
90
91 // We generally try to create the oops directly when parsing, rather than
92 // allocating temporary data structures and copying the bytes twice. A
93 // temporary area is only needed when parsing utf8 entries in the constant
94 // pool and when parsing line number tables.
95
96 // We add assert in debug mode when class format is not checked.
97
98 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
99 #define JAVA_MIN_SUPPORTED_VERSION 45
100 #define JAVA_PREVIEW_MINOR_VERSION 65535
101
102 // Used for two backward compatibility reasons:
103 // - to check for new additions to the class file format in JDK1.5
104 // - to check for bug fixes in the format checker in JDK1.5
105 #define JAVA_1_5_VERSION 49
106
107 // Used for backward compatibility reasons:
108 // - to check for javac bug fixes that happened after 1.5
109 // - also used as the max version when running in jdk6
110 #define JAVA_6_VERSION 50
111
112 // Used for backward compatibility reasons:
113 // - to disallow argument and require ACC_STATIC for <clinit> methods
114 #define JAVA_7_VERSION 51
115
116 // Extension method support.
117 #define JAVA_8_VERSION 52
118
119 #define JAVA_9_VERSION 53
120
121 #define JAVA_10_VERSION 54
122
123 #define JAVA_11_VERSION 55
124
125 #define JAVA_12_VERSION 56
126
127 #define JAVA_13_VERSION 57
128
129 #define CONSTANT_CLASS_DESCRIPTORS 57
130
131 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
132 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION,
133 "Unexpected bad constant pool entry");
134 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
135 }
136
137 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
138 ConstantPool* cp,
139 const int length,
140 TRAPS) {
141 assert(stream != NULL, "invariant");
142 assert(cp != NULL, "invariant");
143
144 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
145 // this function (_current can be allocated in a register, with scalar
146 // replacement of aggregates). The _current pointer is copied back to
147 // stream() when this function returns. DON'T call another method within
148 // this method that uses stream().
149 const ClassFileStream cfs1 = *stream;
150 const ClassFileStream* const cfs = &cfs1;
151
152 assert(cfs->allocated_on_stack(), "should be local");
153 debug_only(const u1* const old_current = stream->current();)
154
155 // Used for batching symbol allocations.
156 const char* names[SymbolTable::symbol_alloc_batch_size];
157 int lengths[SymbolTable::symbol_alloc_batch_size];
158 int indices[SymbolTable::symbol_alloc_batch_size];
159 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
160 int names_count = 0;
161
162 // parsing Index 0 is unused
163 for (int index = 1; index < length; index++) {
164 // Each of the following case guarantees one more byte in the stream
165 // for the following tag or the access_flags following constant pool,
166 // so we don't need bounds-check for reading tag.
167 const u1 tag = cfs->get_u1_fast();
168 switch (tag) {
169 case JVM_CONSTANT_Class: {
170 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
171 const u2 name_index = cfs->get_u2_fast();
172 cp->klass_index_at_put(index, name_index);
173 break;
174 }
175 case JVM_CONSTANT_Fieldref: {
176 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
177 const u2 class_index = cfs->get_u2_fast();
178 const u2 name_and_type_index = cfs->get_u2_fast();
179 cp->field_at_put(index, class_index, name_and_type_index);
180 break;
181 }
182 case JVM_CONSTANT_Methodref: {
183 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
184 const u2 class_index = cfs->get_u2_fast();
185 const u2 name_and_type_index = cfs->get_u2_fast();
186 cp->method_at_put(index, class_index, name_and_type_index);
187 break;
188 }
189 case JVM_CONSTANT_InterfaceMethodref: {
190 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
191 const u2 class_index = cfs->get_u2_fast();
192 const u2 name_and_type_index = cfs->get_u2_fast();
193 cp->interface_method_at_put(index, class_index, name_and_type_index);
194 break;
195 }
196 case JVM_CONSTANT_String : {
197 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
198 const u2 string_index = cfs->get_u2_fast();
199 cp->string_index_at_put(index, string_index);
200 break;
201 }
202 case JVM_CONSTANT_MethodHandle :
203 case JVM_CONSTANT_MethodType: {
204 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
205 classfile_parse_error(
206 "Class file version does not support constant tag %u in class file %s",
207 tag, CHECK);
208 }
209 if (tag == JVM_CONSTANT_MethodHandle) {
210 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
211 const u1 ref_kind = cfs->get_u1_fast();
212 const u2 method_index = cfs->get_u2_fast();
213 cp->method_handle_index_at_put(index, ref_kind, method_index);
214 }
215 else if (tag == JVM_CONSTANT_MethodType) {
216 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
217 const u2 signature_index = cfs->get_u2_fast();
218 cp->method_type_index_at_put(index, signature_index);
219 }
220 else {
221 ShouldNotReachHere();
222 }
223 break;
224 }
225 case JVM_CONSTANT_Dynamic : {
226 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
227 classfile_parse_error(
228 "Class file version does not support constant tag %u in class file %s",
229 tag, CHECK);
230 }
231 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
232 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
233 const u2 name_and_type_index = cfs->get_u2_fast();
234 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
235 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
236 }
237 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
238 break;
239 }
240 case JVM_CONSTANT_InvokeDynamic : {
241 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
242 classfile_parse_error(
243 "Class file version does not support constant tag %u in class file %s",
244 tag, CHECK);
245 }
246 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
247 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
248 const u2 name_and_type_index = cfs->get_u2_fast();
249 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
250 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
251 }
252 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
253 break;
254 }
255 case JVM_CONSTANT_Integer: {
256 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
257 const u4 bytes = cfs->get_u4_fast();
258 cp->int_at_put(index, (jint)bytes);
259 break;
260 }
261 case JVM_CONSTANT_Float: {
262 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
263 const u4 bytes = cfs->get_u4_fast();
264 cp->float_at_put(index, *(jfloat*)&bytes);
265 break;
266 }
267 case JVM_CONSTANT_Long: {
268 // A mangled type might cause you to overrun allocated memory
269 guarantee_property(index + 1 < length,
270 "Invalid constant pool entry %u in class file %s",
271 index,
272 CHECK);
273 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
274 const u8 bytes = cfs->get_u8_fast();
275 cp->long_at_put(index, bytes);
276 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
277 break;
278 }
279 case JVM_CONSTANT_Double: {
280 // A mangled type might cause you to overrun allocated memory
281 guarantee_property(index+1 < length,
282 "Invalid constant pool entry %u in class file %s",
283 index,
284 CHECK);
285 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
286 const u8 bytes = cfs->get_u8_fast();
287 cp->double_at_put(index, *(jdouble*)&bytes);
288 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
289 break;
290 }
291 case JVM_CONSTANT_NameAndType: {
292 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
293 const u2 name_index = cfs->get_u2_fast();
294 const u2 signature_index = cfs->get_u2_fast();
295 cp->name_and_type_at_put(index, name_index, signature_index);
296 break;
297 }
298 case JVM_CONSTANT_Utf8 : {
299 cfs->guarantee_more(2, CHECK); // utf8_length
300 u2 utf8_length = cfs->get_u2_fast();
301 const u1* utf8_buffer = cfs->current();
302 assert(utf8_buffer != NULL, "null utf8 buffer");
303 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
304 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
305 cfs->skip_u1_fast(utf8_length);
306
307 // Before storing the symbol, make sure it's legal
308 if (_need_verify) {
309 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
310 }
311
312 if (has_cp_patch_at(index)) {
313 Handle patch = clear_cp_patch_at(index);
314 guarantee_property(java_lang_String::is_instance(patch()),
315 "Illegal utf8 patch at %d in class file %s",
316 index,
317 CHECK);
318 const char* const str = java_lang_String::as_utf8_string(patch());
319 // (could use java_lang_String::as_symbol instead, but might as well batch them)
320 utf8_buffer = (const u1*) str;
321 utf8_length = (u2) strlen(str);
322 }
323
324 unsigned int hash;
325 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
326 utf8_length,
327 hash);
328 if (result == NULL) {
329 names[names_count] = (const char*)utf8_buffer;
330 lengths[names_count] = utf8_length;
331 indices[names_count] = index;
332 hashValues[names_count++] = hash;
333 if (names_count == SymbolTable::symbol_alloc_batch_size) {
334 SymbolTable::new_symbols(_loader_data,
335 cp,
336 names_count,
337 names,
338 lengths,
339 indices,
340 hashValues,
341 CHECK);
342 names_count = 0;
343 }
344 } else {
345 cp->symbol_at_put(index, result);
346 }
347 break;
348 }
349 case 19:
350 case 20: {
351 // Record that an error occurred in these two cases but keep parsing so
352 // that ACC_Module can be checked for in the access_flags. Need to
353 // throw NoClassDefFoundError in that case.
354 if (_major_version >= JAVA_9_VERSION) {
355 cfs->guarantee_more(3, CHECK);
356 cfs->get_u2_fast();
357 set_class_bad_constant_seen(tag);
358 break;
359 }
360 }
361 default: {
362 classfile_parse_error("Unknown constant tag %u in class file %s",
363 tag,
364 CHECK);
365 break;
366 }
367 } // end of switch(tag)
368 } // end of for
369
370 // Allocate the remaining symbols
371 if (names_count > 0) {
372 SymbolTable::new_symbols(_loader_data,
373 cp,
374 names_count,
375 names,
376 lengths,
377 indices,
378 hashValues,
379 CHECK);
380 }
381
382 // Copy _current pointer of local copy back to stream.
383 assert(stream->current() == old_current, "non-exclusive use of stream");
384 stream->set_current(cfs1.current());
385
386 }
387
388 static inline bool valid_cp_range(int index, int length) {
389 return (index > 0 && index < length);
390 }
391
392 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
393 assert(cp != NULL, "invariant");
394 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
395 return cp->symbol_at(index);
396 }
397 return NULL;
398 }
399
400 #ifdef ASSERT
401 PRAGMA_DIAG_PUSH
402 PRAGMA_FORMAT_NONLITERAL_IGNORED
403 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
404 ResourceMark rm(THREAD);
405 fatal(msg, _class_name->as_C_string());
406 }
407
408 void ClassFileParser::report_assert_property_failure(const char* msg,
409 int index,
410 TRAPS) const {
411 ResourceMark rm(THREAD);
412 fatal(msg, index, _class_name->as_C_string());
413 }
414 PRAGMA_DIAG_POP
415 #endif
416
417 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
418 ConstantPool* const cp,
419 const int length,
420 TRAPS) {
421 assert(cp != NULL, "invariant");
422 assert(stream != NULL, "invariant");
423
424 // parsing constant pool entries
425 parse_constant_pool_entries(stream, cp, length, CHECK);
426 if (class_bad_constant_seen() != 0) {
427 // a bad CP entry has been detected previously so stop parsing and just return.
428 return;
429 }
430
431 int index = 1; // declared outside of loops for portability
432 int num_klasses = 0;
433
434 // first verification pass - validate cross references
435 // and fixup class and string constants
436 for (index = 1; index < length; index++) { // Index 0 is unused
437 const jbyte tag = cp->tag_at(index).value();
438 switch (tag) {
439 case JVM_CONSTANT_Class: {
440 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
441 break;
442 }
443 case JVM_CONSTANT_Fieldref:
444 // fall through
445 case JVM_CONSTANT_Methodref:
446 // fall through
447 case JVM_CONSTANT_InterfaceMethodref: {
448 if (!_need_verify) break;
449 const int klass_ref_index = cp->klass_ref_index_at(index);
450 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
451 check_property(valid_klass_reference_at(klass_ref_index),
452 "Invalid constant pool index %u in class file %s",
453 klass_ref_index, CHECK);
454 check_property(valid_cp_range(name_and_type_ref_index, length) &&
455 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
456 "Invalid constant pool index %u in class file %s",
457 name_and_type_ref_index, CHECK);
458 break;
459 }
460 case JVM_CONSTANT_String: {
461 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
462 break;
463 }
464 case JVM_CONSTANT_Integer:
465 break;
466 case JVM_CONSTANT_Float:
467 break;
468 case JVM_CONSTANT_Long:
469 case JVM_CONSTANT_Double: {
470 index++;
471 check_property(
472 (index < length && cp->tag_at(index).is_invalid()),
473 "Improper constant pool long/double index %u in class file %s",
474 index, CHECK);
475 break;
476 }
477 case JVM_CONSTANT_NameAndType: {
478 if (!_need_verify) break;
479 const int name_ref_index = cp->name_ref_index_at(index);
480 const int signature_ref_index = cp->signature_ref_index_at(index);
481 check_property(valid_symbol_at(name_ref_index),
482 "Invalid constant pool index %u in class file %s",
483 name_ref_index, CHECK);
484 check_property(valid_symbol_at(signature_ref_index),
485 "Invalid constant pool index %u in class file %s",
486 signature_ref_index, CHECK);
487 break;
488 }
489 case JVM_CONSTANT_Utf8:
490 break;
491 case JVM_CONSTANT_UnresolvedClass: // fall-through
492 case JVM_CONSTANT_UnresolvedClassInError: {
493 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
494 break;
495 }
496 case JVM_CONSTANT_ClassIndex: {
497 const int class_index = cp->klass_index_at(index);
498 check_property(valid_symbol_at(class_index),
499 "Invalid constant pool index %u in class file %s",
500 class_index, CHECK);
501
502 Symbol* const name = cp->symbol_at(class_index);
503 const unsigned int name_len = name->utf8_length();
504 if (name->is_Q_signature()) {
505 cp->unresolved_qdescriptor_at_put(index, class_index, num_klasses++);
506 } else {
507 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
508 }
509 break;
510 }
511 case JVM_CONSTANT_StringIndex: {
512 const int string_index = cp->string_index_at(index);
513 check_property(valid_symbol_at(string_index),
514 "Invalid constant pool index %u in class file %s",
515 string_index, CHECK);
516 Symbol* const sym = cp->symbol_at(string_index);
517 cp->unresolved_string_at_put(index, sym);
518 break;
519 }
520 case JVM_CONSTANT_MethodHandle: {
521 const int ref_index = cp->method_handle_index_at(index);
522 check_property(valid_cp_range(ref_index, length),
523 "Invalid constant pool index %u in class file %s",
524 ref_index, CHECK);
525 const constantTag tag = cp->tag_at(ref_index);
526 const int ref_kind = cp->method_handle_ref_kind_at(index);
527
528 switch (ref_kind) {
529 case JVM_REF_getField:
530 case JVM_REF_getStatic:
531 case JVM_REF_putField:
532 case JVM_REF_putStatic: {
533 check_property(
534 tag.is_field(),
535 "Invalid constant pool index %u in class file %s (not a field)",
536 ref_index, CHECK);
537 break;
538 }
539 case JVM_REF_invokeVirtual:
540 case JVM_REF_newInvokeSpecial: {
541 check_property(
542 tag.is_method(),
543 "Invalid constant pool index %u in class file %s (not a method)",
544 ref_index, CHECK);
545 break;
546 }
547 case JVM_REF_invokeStatic:
548 case JVM_REF_invokeSpecial: {
549 check_property(
550 tag.is_method() ||
551 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
552 "Invalid constant pool index %u in class file %s (not a method)",
553 ref_index, CHECK);
554 break;
555 }
556 case JVM_REF_invokeInterface: {
557 check_property(
558 tag.is_interface_method(),
559 "Invalid constant pool index %u in class file %s (not an interface method)",
560 ref_index, CHECK);
561 break;
562 }
563 default: {
564 classfile_parse_error(
565 "Bad method handle kind at constant pool index %u in class file %s",
566 index, CHECK);
567 }
568 } // switch(refkind)
569 // Keep the ref_index unchanged. It will be indirected at link-time.
570 break;
571 } // case MethodHandle
572 case JVM_CONSTANT_MethodType: {
573 const int ref_index = cp->method_type_index_at(index);
574 check_property(valid_symbol_at(ref_index),
575 "Invalid constant pool index %u in class file %s",
576 ref_index, CHECK);
577 break;
578 }
579 case JVM_CONSTANT_Dynamic: {
580 const int name_and_type_ref_index =
581 cp->bootstrap_name_and_type_ref_index_at(index);
582
583 check_property(valid_cp_range(name_and_type_ref_index, length) &&
584 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
585 "Invalid constant pool index %u in class file %s",
586 name_and_type_ref_index, CHECK);
587 // bootstrap specifier index must be checked later,
588 // when BootstrapMethods attr is available
589
590 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
591 cp->set_has_dynamic_constant();
592 break;
593 }
594 case JVM_CONSTANT_InvokeDynamic: {
595 const int name_and_type_ref_index =
596 cp->bootstrap_name_and_type_ref_index_at(index);
597
598 check_property(valid_cp_range(name_and_type_ref_index, length) &&
599 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
600 "Invalid constant pool index %u in class file %s",
601 name_and_type_ref_index, CHECK);
602 // bootstrap specifier index must be checked later,
603 // when BootstrapMethods attr is available
604 break;
605 }
606 default: {
607 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
608 ShouldNotReachHere();
609 break;
610 }
611 } // switch(tag)
612 } // end of for
613
614 _first_patched_klass_resolved_index = num_klasses;
615 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
616
617 if (_cp_patches != NULL) {
618 // need to treat this_class specially...
619
620 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
621 // for now. These will be replaced with actual names of the patched classes in patch_class().
622 Symbol* s = vmSymbols::star_name();
623 for (int n=_orig_cp_size; n<cp->length(); n++) {
624 cp->symbol_at_put(n, s);
625 }
626
627 int this_class_index;
628 {
629 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
630 const u1* const mark = stream->current();
631 stream->skip_u2_fast(1); // skip flags
632 this_class_index = stream->get_u2_fast();
633 stream->set_current(mark); // revert to mark
634 }
635
636 for (index = 1; index < length; index++) { // Index 0 is unused
637 if (has_cp_patch_at(index)) {
638 guarantee_property(index != this_class_index,
639 "Illegal constant pool patch to self at %d in class file %s",
640 index, CHECK);
641 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
642 }
643 }
644 }
645
646 if (!_need_verify) {
647 return;
648 }
649
650 // second verification pass - checks the strings are of the right format.
651 // but not yet to the other entries
652 for (index = 1; index < length; index++) {
653 const jbyte tag = cp->tag_at(index).value();
654 switch (tag) {
655 case JVM_CONSTANT_UnresolvedClass: {
656 const Symbol* const class_name = cp->klass_name_at(index);
657 // check the name, even if _cp_patches will overwrite it
658 verify_legal_class_name(class_name, CHECK);
659 break;
660 }
661 case JVM_CONSTANT_NameAndType: {
662 if (_need_verify) {
663 const int sig_index = cp->signature_ref_index_at(index);
664 const int name_index = cp->name_ref_index_at(index);
665 const Symbol* const name = cp->symbol_at(name_index);
666 const Symbol* const sig = cp->symbol_at(sig_index);
667 guarantee_property(sig->utf8_length() != 0,
668 "Illegal zero length constant pool entry at %d in class %s",
669 sig_index, CHECK);
670 guarantee_property(name->utf8_length() != 0,
671 "Illegal zero length constant pool entry at %d in class %s",
672 name_index, CHECK);
673
674 if (sig->char_at(0) == JVM_SIGNATURE_FUNC) {
675 // Format check method name and signature
676 verify_legal_method_name(name, CHECK);
677 verify_legal_method_signature(name, sig, CHECK);
678 } else {
679 // Format check field name and signature
680 verify_legal_field_name(name, CHECK);
681 verify_legal_field_signature(name, sig, CHECK);
682 }
683 }
684 break;
685 }
686 case JVM_CONSTANT_Dynamic: {
687 const int name_and_type_ref_index =
688 cp->name_and_type_ref_index_at(index);
689 // already verified to be utf8
690 const int name_ref_index =
691 cp->name_ref_index_at(name_and_type_ref_index);
692 // already verified to be utf8
693 const int signature_ref_index =
694 cp->signature_ref_index_at(name_and_type_ref_index);
695 const Symbol* const name = cp->symbol_at(name_ref_index);
696 const Symbol* const signature = cp->symbol_at(signature_ref_index);
697 if (_need_verify) {
698 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
699 // Need only to be sure signature is non-zero length and the right type.
700 if (signature->utf8_length() == 0 ||
701 signature->char_at(0) == JVM_SIGNATURE_FUNC) {
702 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
703 }
704 }
705 break;
706 }
707 case JVM_CONSTANT_InvokeDynamic:
708 case JVM_CONSTANT_Fieldref:
709 case JVM_CONSTANT_Methodref:
710 case JVM_CONSTANT_InterfaceMethodref: {
711 const int name_and_type_ref_index =
712 cp->name_and_type_ref_index_at(index);
713 // already verified to be utf8
714 const int name_ref_index =
715 cp->name_ref_index_at(name_and_type_ref_index);
716 // already verified to be utf8
717 const int signature_ref_index =
718 cp->signature_ref_index_at(name_and_type_ref_index);
719 const Symbol* const name = cp->symbol_at(name_ref_index);
720 const Symbol* const signature = cp->symbol_at(signature_ref_index);
721 if (tag == JVM_CONSTANT_Fieldref) {
722 if (_need_verify) {
723 // Field name and signature are verified above, when iterating NameAndType_info.
724 // Need only to be sure signature is non-zero length and the right type.
725 if (signature->utf8_length() == 0 ||
726 signature->char_at(0) == JVM_SIGNATURE_FUNC) {
727 throwIllegalSignature("Field", name, signature, CHECK);
728 }
729 }
730 } else {
731 if (_need_verify) {
732 // Method name and signature are verified above, when iterating NameAndType_info.
733 // Need only to be sure signature is non-zero length and the right type.
734 if (signature->utf8_length() == 0 ||
735 signature->char_at(0) != JVM_SIGNATURE_FUNC) {
736 throwIllegalSignature("Method", name, signature, CHECK);
737 }
738 }
739 // 4509014: If a class method name begins with '<', it must be "<init>"
740 const unsigned int name_len = name->utf8_length();
741 if (tag == JVM_CONSTANT_Methodref &&
742 name_len != 0 &&
743 name->char_at(0) == '<' &&
744 name != vmSymbols::object_initializer_name()) {
745 classfile_parse_error(
746 "Bad method name at constant pool index %u in class file %s",
747 name_ref_index, CHECK);
748 }
749 }
750 break;
751 }
752 case JVM_CONSTANT_MethodHandle: {
753 const int ref_index = cp->method_handle_index_at(index);
754 const int ref_kind = cp->method_handle_ref_kind_at(index);
755 switch (ref_kind) {
756 case JVM_REF_invokeVirtual:
757 case JVM_REF_invokeStatic:
758 case JVM_REF_invokeSpecial:
759 case JVM_REF_newInvokeSpecial: {
760 const int name_and_type_ref_index =
761 cp->name_and_type_ref_index_at(ref_index);
762 const int name_ref_index =
763 cp->name_ref_index_at(name_and_type_ref_index);
764 const Symbol* const name = cp->symbol_at(name_ref_index);
765 if (name != vmSymbols::object_initializer_name()) {
766 if (ref_kind == JVM_REF_newInvokeSpecial) {
767 classfile_parse_error(
768 "Bad constructor name at constant pool index %u in class file %s",
769 name_ref_index, CHECK);
770 }
771 } else {
772 // The allowed invocation mode of <init> depends on its signature.
773 // This test corresponds to verify_invoke_instructions in the verifier.
774 const int signature_ref_index =
775 cp->signature_ref_index_at(name_and_type_ref_index);
776 const Symbol* const signature = cp->symbol_at(signature_ref_index);
777 if (signature->is_void_method_signature()
778 && ref_kind == JVM_REF_newInvokeSpecial) {
779 // OK, could be a constructor call
780 } else if (!signature->is_void_method_signature()
781 && ref_kind == JVM_REF_invokeStatic) {
782 // also OK, could be a static factory call
783 } else {
784 classfile_parse_error(
785 "Bad method name at constant pool index %u in class file %s",
786 name_ref_index, CHECK);
787 }
788 }
789 break;
790 }
791 // Other ref_kinds are already fully checked in previous pass.
792 } // switch(ref_kind)
793 break;
794 }
795 case JVM_CONSTANT_MethodType: {
796 const Symbol* const no_name = vmSymbols::type_name(); // place holder
797 const Symbol* const signature = cp->method_type_signature_at(index);
798 verify_legal_method_signature(no_name, signature, CHECK);
799 break;
800 }
801 case JVM_CONSTANT_Utf8: {
802 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
803 }
804 } // switch(tag)
805 } // end of for
806 }
807
808 Handle ClassFileParser::clear_cp_patch_at(int index) {
809 Handle patch = cp_patch_at(index);
810 _cp_patches->at_put(index, Handle());
811 assert(!has_cp_patch_at(index), "");
812 return patch;
813 }
814
815 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
816 int name_index = _orig_cp_size + _num_patched_klasses;
817 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
818
819 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
820 _num_patched_klasses ++;
821 }
822
823 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
824 int index,
825 Handle patch,
826 TRAPS) {
827 assert(cp != NULL, "invariant");
828
829 BasicType patch_type = T_VOID;
830
831 switch (cp->tag_at(index).value()) {
832
833 case JVM_CONSTANT_UnresolvedClass: {
834 // Patching a class means pre-resolving it.
835 // The name in the constant pool is ignored.
836 if (java_lang_Class::is_instance(patch())) {
837 guarantee_property(!java_lang_Class::is_primitive(patch()),
838 "Illegal class patch at %d in class file %s",
839 index, CHECK);
840 Klass* k = java_lang_Class::as_Klass(patch());
841 patch_class(cp, index, k, k->name());
842 } else {
843 guarantee_property(java_lang_String::is_instance(patch()),
844 "Illegal class patch at %d in class file %s",
845 index, CHECK);
846 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK);
847 patch_class(cp, index, NULL, name);
848 }
849 break;
850 }
851
852 case JVM_CONSTANT_String: {
853 // skip this patch and don't clear it. Needs the oop array for resolved
854 // references to be created first.
855 return;
856 }
857 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
858 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
859 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
860 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
861 patch_prim:
862 {
863 jvalue value;
864 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
865 guarantee_property(value_type == patch_type,
866 "Illegal primitive patch at %d in class file %s",
867 index, CHECK);
868 switch (value_type) {
869 case T_INT: cp->int_at_put(index, value.i); break;
870 case T_FLOAT: cp->float_at_put(index, value.f); break;
871 case T_LONG: cp->long_at_put(index, value.j); break;
872 case T_DOUBLE: cp->double_at_put(index, value.d); break;
873 default: assert(false, "");
874 }
875 } // end patch_prim label
876 break;
877
878 default: {
879 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
880 guarantee_property(!has_cp_patch_at(index),
881 "Illegal unexpected patch at %d in class file %s",
882 index, CHECK);
883 return;
884 }
885 } // end of switch(tag)
886
887 // On fall-through, mark the patch as used.
888 clear_cp_patch_at(index);
889 }
890 class NameSigHash: public ResourceObj {
891 public:
892 const Symbol* _name; // name
893 const Symbol* _sig; // signature
894 NameSigHash* _next; // Next entry in hash table
895 };
896
897 static const int HASH_ROW_SIZE = 256;
898
899 static unsigned int hash(const Symbol* name, const Symbol* sig) {
900 unsigned int raw_hash = 0;
901 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
902 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
903
904 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
905 }
906
907
908 static void initialize_hashtable(NameSigHash** table) {
909 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
910 }
911 // Return false if the name/sig combination is found in table.
912 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
913 // The old format checker uses heap sort to find duplicates.
914 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
915 // of table since we don't expect Symbol*'s to move.
916 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
917 assert(name != NULL, "name in constant pool is NULL");
918
919 // First lookup for duplicates
920 int index = hash(name, sig);
921 NameSigHash* entry = table[index];
922 while (entry != NULL) {
923 if (entry->_name == name && entry->_sig == sig) {
924 return false;
925 }
926 entry = entry->_next;
927 }
928
929 // No duplicate is found, allocate a new entry and fill it.
930 entry = new NameSigHash();
931 entry->_name = name;
932 entry->_sig = sig;
933
934 // Insert into hash table
935 entry->_next = table[index];
936 table[index] = entry;
937
938 return true;
939 }
940
941 // Side-effects: populates the _local_interfaces field
942 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
943 const int itfs_len,
944 ConstantPool* const cp,
945 bool* const has_nonstatic_concrete_methods,
946 TRAPS) {
947 assert(stream != NULL, "invariant");
948 assert(cp != NULL, "invariant");
949 assert(has_nonstatic_concrete_methods != NULL, "invariant");
950
951 if (itfs_len == 0) {
952 _local_interfaces = Universe::the_empty_instance_klass_array();
953 } else {
954 assert(itfs_len > 0, "only called for len>0");
955 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
956
957 int index;
958 for (index = 0; index < itfs_len; index++) {
959 const u2 interface_index = stream->get_u2(CHECK);
960 Klass* interf;
961 check_property(
962 valid_klass_reference_at(interface_index),
963 "Interface name has bad constant pool index %u in class file %s",
964 interface_index, CHECK);
965 if (cp->tag_at(interface_index).is_klass()) {
966 interf = cp->resolved_klass_at(interface_index);
967 } else {
968 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
969
970 // Don't need to check legal name because it's checked when parsing constant pool.
971 // But need to make sure it's not an array type.
972 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
973 "Bad interface name in class file %s", CHECK);
974
975 // Call resolve_super so classcircularity is checked
976 interf = SystemDictionary::resolve_super_or_fail(
977 _class_name,
978 unresolved_klass,
979 Handle(THREAD, _loader_data->class_loader()),
980 _protection_domain,
981 false,
982 CHECK);
983 }
984
985 if (!interf->is_interface()) {
986 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
987 err_msg("class %s can not implement %s, because it is not an interface (%s)",
988 _class_name->as_klass_external_name(),
989 interf->external_name(),
990 interf->class_in_module_of_loader()));
991 }
992
993 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
994 *has_nonstatic_concrete_methods = true;
995 }
996 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
997 }
998
999 if (!_need_verify || itfs_len <= 1) {
1000 return;
1001 }
1002
1003 // Check if there's any duplicates in interfaces
1004 ResourceMark rm(THREAD);
1005 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1006 NameSigHash*,
1007 HASH_ROW_SIZE);
1008 initialize_hashtable(interface_names);
1009 bool dup = false;
1010 const Symbol* name = NULL;
1011 {
1012 debug_only(NoSafepointVerifier nsv;)
1013 for (index = 0; index < itfs_len; index++) {
1014 const InstanceKlass* const k = _local_interfaces->at(index);
1015 name = k->name();
1016 // If no duplicates, add (name, NULL) in hashtable interface_names.
1017 if (!put_after_lookup(name, NULL, interface_names)) {
1018 dup = true;
1019 break;
1020 }
1021 }
1022 }
1023 if (dup) {
1024 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
1025 name->as_C_string(), CHECK);
1026 }
1027 }
1028 }
1029
1030 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
1031 int constantvalue_index,
1032 int signature_index,
1033 TRAPS) const {
1034 // Make sure the constant pool entry is of a type appropriate to this field
1035 guarantee_property(
1036 (constantvalue_index > 0 &&
1037 constantvalue_index < cp->length()),
1038 "Bad initial value index %u in ConstantValue attribute in class file %s",
1039 constantvalue_index, CHECK);
1040
1041 const constantTag value_type = cp->tag_at(constantvalue_index);
1042 switch(cp->basic_type_for_signature_at(signature_index)) {
1043 case T_LONG: {
1044 guarantee_property(value_type.is_long(),
1045 "Inconsistent constant value type in class file %s",
1046 CHECK);
1047 break;
1048 }
1049 case T_FLOAT: {
1050 guarantee_property(value_type.is_float(),
1051 "Inconsistent constant value type in class file %s",
1052 CHECK);
1053 break;
1054 }
1055 case T_DOUBLE: {
1056 guarantee_property(value_type.is_double(),
1057 "Inconsistent constant value type in class file %s",
1058 CHECK);
1059 break;
1060 }
1061 case T_BYTE:
1062 case T_CHAR:
1063 case T_SHORT:
1064 case T_BOOLEAN:
1065 case T_INT: {
1066 guarantee_property(value_type.is_int(),
1067 "Inconsistent constant value type in class file %s",
1068 CHECK);
1069 break;
1070 }
1071 case T_OBJECT: {
1072 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1073 && value_type.is_string()),
1074 "Bad string initial value in class file %s",
1075 CHECK);
1076 break;
1077 }
1078 default: {
1079 classfile_parse_error("Unable to set initial value %u in class file %s",
1080 constantvalue_index,
1081 CHECK);
1082 }
1083 }
1084 }
1085
1086 class AnnotationCollector : public ResourceObj{
1087 public:
1088 enum Location { _in_field, _in_method, _in_class };
1089 enum ID {
1090 _unknown = 0,
1091 _method_CallerSensitive,
1092 _method_ForceInline,
1093 _method_DontInline,
1094 _method_InjectedProfile,
1095 _method_LambdaForm_Compiled,
1096 _method_Hidden,
1097 _method_HotSpotIntrinsicCandidate,
1098 _jdk_internal_vm_annotation_Contended,
1099 _field_Stable,
1100 _jdk_internal_vm_annotation_ReservedStackAccess,
1101 _annotation_LIMIT
1102 };
1103 const Location _location;
1104 int _annotations_present;
1105 u2 _contended_group;
1106
1107 AnnotationCollector(Location location)
1108 : _location(location), _annotations_present(0)
1109 {
1110 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1111 }
1112 // If this annotation name has an ID, report it (or _none).
1113 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1114 // Set the annotation name:
1115 void set_annotation(ID id) {
1116 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1117 _annotations_present |= nth_bit((int)id);
1118 }
1119
1120 void remove_annotation(ID id) {
1121 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1122 _annotations_present &= ~nth_bit((int)id);
1123 }
1124
1125 // Report if the annotation is present.
1126 bool has_any_annotations() const { return _annotations_present != 0; }
1127 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1128
1129 void set_contended_group(u2 group) { _contended_group = group; }
1130 u2 contended_group() const { return _contended_group; }
1131
1132 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1133
1134 void set_stable(bool stable) { set_annotation(_field_Stable); }
1135 bool is_stable() const { return has_annotation(_field_Stable); }
1136 };
1137
1138 // This class also doubles as a holder for metadata cleanup.
1139 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1140 private:
1141 ClassLoaderData* _loader_data;
1142 AnnotationArray* _field_annotations;
1143 AnnotationArray* _field_type_annotations;
1144 public:
1145 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1146 AnnotationCollector(_in_field),
1147 _loader_data(loader_data),
1148 _field_annotations(NULL),
1149 _field_type_annotations(NULL) {}
1150 ~FieldAnnotationCollector();
1151 void apply_to(FieldInfo* f);
1152 AnnotationArray* field_annotations() { return _field_annotations; }
1153 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1154
1155 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1156 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1157 };
1158
1159 class MethodAnnotationCollector : public AnnotationCollector{
1160 public:
1161 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1162 void apply_to(const methodHandle& m);
1163 };
1164
1165 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1166 public:
1167 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1168 void apply_to(InstanceKlass* ik);
1169 };
1170
1171
1172 static int skip_annotation_value(const u1*, int, int); // fwd decl
1173
1174 // Safely increment index by val if does not pass limit
1175 #define SAFE_ADD(index, limit, val) \
1176 if (index >= limit - val) return limit; \
1177 index += val;
1178
1179 // Skip an annotation. Return >=limit if there is any problem.
1180 static int skip_annotation(const u1* buffer, int limit, int index) {
1181 assert(buffer != NULL, "invariant");
1182 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1183 // value := switch (tag:u1) { ... }
1184 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1185 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1186 while (--nmem >= 0 && index < limit) {
1187 SAFE_ADD(index, limit, 2); // skip member
1188 index = skip_annotation_value(buffer, limit, index);
1189 }
1190 return index;
1191 }
1192
1193 // Skip an annotation value. Return >=limit if there is any problem.
1194 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1195 assert(buffer != NULL, "invariant");
1196
1197 // value := switch (tag:u1) {
1198 // case B, C, I, S, Z, D, F, J, c: con:u2;
1199 // case e: e_class:u2 e_name:u2;
1200 // case s: s_con:u2;
1201 // case [: do(nval:u2) {value};
1202 // case @: annotation;
1203 // case s: s_con:u2;
1204 // }
1205 SAFE_ADD(index, limit, 1); // read tag
1206 const u1 tag = buffer[index - 1];
1207 switch (tag) {
1208 case 'B':
1209 case 'C':
1210 case 'I':
1211 case 'S':
1212 case 'Z':
1213 case 'D':
1214 case 'F':
1215 case 'J':
1216 case 'c':
1217 case 's':
1218 SAFE_ADD(index, limit, 2); // skip con or s_con
1219 break;
1220 case 'e':
1221 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1222 break;
1223 case '[':
1224 {
1225 SAFE_ADD(index, limit, 2); // read nval
1226 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1227 while (--nval >= 0 && index < limit) {
1228 index = skip_annotation_value(buffer, limit, index);
1229 }
1230 }
1231 break;
1232 case '@':
1233 index = skip_annotation(buffer, limit, index);
1234 break;
1235 default:
1236 return limit; // bad tag byte
1237 }
1238 return index;
1239 }
1240
1241 // Sift through annotations, looking for those significant to the VM:
1242 static void parse_annotations(const ConstantPool* const cp,
1243 const u1* buffer, int limit,
1244 AnnotationCollector* coll,
1245 ClassLoaderData* loader_data,
1246 TRAPS) {
1247
1248 assert(cp != NULL, "invariant");
1249 assert(buffer != NULL, "invariant");
1250 assert(coll != NULL, "invariant");
1251 assert(loader_data != NULL, "invariant");
1252
1253 // annotations := do(nann:u2) {annotation}
1254 int index = 2; // read nann
1255 if (index >= limit) return;
1256 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1257 enum { // initial annotation layout
1258 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1259 count_off = 2, // u2 such as 1 (one value)
1260 member_off = 4, // utf8 such as 'value'
1261 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1262 e_tag_val = 'e',
1263 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1264 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1265 e_size = 11, // end of 'e' annotation
1266 c_tag_val = 'c', // payload is type
1267 c_con_off = 7, // utf8 payload, such as 'I'
1268 c_size = 9, // end of 'c' annotation
1269 s_tag_val = 's', // payload is String
1270 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1271 s_size = 9,
1272 min_size = 6 // smallest possible size (zero members)
1273 };
1274 // Cannot add min_size to index in case of overflow MAX_INT
1275 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1276 int index0 = index;
1277 index = skip_annotation(buffer, limit, index);
1278 const u1* const abase = buffer + index0;
1279 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1280 const int count = Bytes::get_Java_u2((address)abase + count_off);
1281 const Symbol* const aname = check_symbol_at(cp, atype);
1282 if (aname == NULL) break; // invalid annotation name
1283 const Symbol* member = NULL;
1284 if (count >= 1) {
1285 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1286 member = check_symbol_at(cp, member_index);
1287 if (member == NULL) break; // invalid member name
1288 }
1289
1290 // Here is where parsing particular annotations will take place.
1291 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1292 if (AnnotationCollector::_unknown == id) continue;
1293 coll->set_annotation(id);
1294
1295 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1296 // @Contended can optionally specify the contention group.
1297 //
1298 // Contended group defines the equivalence class over the fields:
1299 // the fields within the same contended group are not treated distinct.
1300 // The only exception is default group, which does not incur the
1301 // equivalence. Naturally, contention group for classes is meaningless.
1302 //
1303 // While the contention group is specified as String, annotation
1304 // values are already interned, and we might as well use the constant
1305 // pool index as the group tag.
1306 //
1307 u2 group_index = 0; // default contended group
1308 if (count == 1
1309 && s_size == (index - index0) // match size
1310 && s_tag_val == *(abase + tag_off)
1311 && member == vmSymbols::value_name()) {
1312 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1313 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1314 group_index = 0; // default contended group
1315 }
1316 }
1317 coll->set_contended_group(group_index);
1318 }
1319 }
1320 }
1321
1322
1323 // Parse attributes for a field.
1324 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1325 u2 attributes_count,
1326 bool is_static, u2 signature_index,
1327 u2* const constantvalue_index_addr,
1328 bool* const is_synthetic_addr,
1329 u2* const generic_signature_index_addr,
1330 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1331 TRAPS) {
1332 assert(cfs != NULL, "invariant");
1333 assert(constantvalue_index_addr != NULL, "invariant");
1334 assert(is_synthetic_addr != NULL, "invariant");
1335 assert(generic_signature_index_addr != NULL, "invariant");
1336 assert(parsed_annotations != NULL, "invariant");
1337 assert(attributes_count > 0, "attributes_count should be greater than 0");
1338
1339 u2 constantvalue_index = 0;
1340 u2 generic_signature_index = 0;
1341 bool is_synthetic = false;
1342 const u1* runtime_visible_annotations = NULL;
1343 int runtime_visible_annotations_length = 0;
1344 const u1* runtime_invisible_annotations = NULL;
1345 int runtime_invisible_annotations_length = 0;
1346 const u1* runtime_visible_type_annotations = NULL;
1347 int runtime_visible_type_annotations_length = 0;
1348 const u1* runtime_invisible_type_annotations = NULL;
1349 int runtime_invisible_type_annotations_length = 0;
1350 bool runtime_invisible_annotations_exists = false;
1351 bool runtime_invisible_type_annotations_exists = false;
1352 const ConstantPool* const cp = _cp;
1353
1354 while (attributes_count--) {
1355 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1356 const u2 attribute_name_index = cfs->get_u2_fast();
1357 const u4 attribute_length = cfs->get_u4_fast();
1358 check_property(valid_symbol_at(attribute_name_index),
1359 "Invalid field attribute index %u in class file %s",
1360 attribute_name_index,
1361 CHECK);
1362
1363 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1364 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1365 // ignore if non-static
1366 if (constantvalue_index != 0) {
1367 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1368 }
1369 check_property(
1370 attribute_length == 2,
1371 "Invalid ConstantValue field attribute length %u in class file %s",
1372 attribute_length, CHECK);
1373
1374 constantvalue_index = cfs->get_u2(CHECK);
1375 if (_need_verify) {
1376 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1377 }
1378 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1379 if (attribute_length != 0) {
1380 classfile_parse_error(
1381 "Invalid Synthetic field attribute length %u in class file %s",
1382 attribute_length, CHECK);
1383 }
1384 is_synthetic = true;
1385 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1386 if (attribute_length != 0) {
1387 classfile_parse_error(
1388 "Invalid Deprecated field attribute length %u in class file %s",
1389 attribute_length, CHECK);
1390 }
1391 } else if (_major_version >= JAVA_1_5_VERSION) {
1392 if (attribute_name == vmSymbols::tag_signature()) {
1393 if (generic_signature_index != 0) {
1394 classfile_parse_error(
1395 "Multiple Signature attributes for field in class file %s", CHECK);
1396 }
1397 if (attribute_length != 2) {
1398 classfile_parse_error(
1399 "Wrong size %u for field's Signature attribute in class file %s",
1400 attribute_length, CHECK);
1401 }
1402 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1403 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1404 if (runtime_visible_annotations != NULL) {
1405 classfile_parse_error(
1406 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1407 }
1408 runtime_visible_annotations_length = attribute_length;
1409 runtime_visible_annotations = cfs->current();
1410 assert(runtime_visible_annotations != NULL, "null visible annotations");
1411 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1412 parse_annotations(cp,
1413 runtime_visible_annotations,
1414 runtime_visible_annotations_length,
1415 parsed_annotations,
1416 _loader_data,
1417 CHECK);
1418 cfs->skip_u1_fast(runtime_visible_annotations_length);
1419 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1420 if (runtime_invisible_annotations_exists) {
1421 classfile_parse_error(
1422 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1423 }
1424 runtime_invisible_annotations_exists = true;
1425 if (PreserveAllAnnotations) {
1426 runtime_invisible_annotations_length = attribute_length;
1427 runtime_invisible_annotations = cfs->current();
1428 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1429 }
1430 cfs->skip_u1(attribute_length, CHECK);
1431 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1432 if (runtime_visible_type_annotations != NULL) {
1433 classfile_parse_error(
1434 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1435 }
1436 runtime_visible_type_annotations_length = attribute_length;
1437 runtime_visible_type_annotations = cfs->current();
1438 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1439 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1440 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1441 if (runtime_invisible_type_annotations_exists) {
1442 classfile_parse_error(
1443 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1444 } else {
1445 runtime_invisible_type_annotations_exists = true;
1446 }
1447 if (PreserveAllAnnotations) {
1448 runtime_invisible_type_annotations_length = attribute_length;
1449 runtime_invisible_type_annotations = cfs->current();
1450 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1451 }
1452 cfs->skip_u1(attribute_length, CHECK);
1453 } else {
1454 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1455 }
1456 } else {
1457 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1458 }
1459 }
1460
1461 *constantvalue_index_addr = constantvalue_index;
1462 *is_synthetic_addr = is_synthetic;
1463 *generic_signature_index_addr = generic_signature_index;
1464 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1465 runtime_visible_annotations_length,
1466 runtime_invisible_annotations,
1467 runtime_invisible_annotations_length,
1468 CHECK);
1469 parsed_annotations->set_field_annotations(a);
1470 a = assemble_annotations(runtime_visible_type_annotations,
1471 runtime_visible_type_annotations_length,
1472 runtime_invisible_type_annotations,
1473 runtime_invisible_type_annotations_length,
1474 CHECK);
1475 parsed_annotations->set_field_type_annotations(a);
1476 return;
1477 }
1478
1479
1480 // Field allocation types. Used for computing field offsets.
1481
1482 enum FieldAllocationType {
1483 STATIC_OOP, // Oops
1484 STATIC_BYTE, // Boolean, Byte, char
1485 STATIC_SHORT, // shorts
1486 STATIC_WORD, // ints
1487 STATIC_DOUBLE, // aligned long or double
1488 STATIC_FLATTENABLE, // flattenable field
1489 NONSTATIC_OOP,
1490 NONSTATIC_BYTE,
1491 NONSTATIC_SHORT,
1492 NONSTATIC_WORD,
1493 NONSTATIC_DOUBLE,
1494 NONSTATIC_FLATTENABLE,
1495 MAX_FIELD_ALLOCATION_TYPE,
1496 BAD_ALLOCATION_TYPE = -1
1497 };
1498
1499 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1500 BAD_ALLOCATION_TYPE, // 0
1501 BAD_ALLOCATION_TYPE, // 1
1502 BAD_ALLOCATION_TYPE, // 2
1503 BAD_ALLOCATION_TYPE, // 3
1504 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1505 NONSTATIC_SHORT, // T_CHAR = 5,
1506 NONSTATIC_WORD, // T_FLOAT = 6,
1507 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1508 NONSTATIC_BYTE, // T_BYTE = 8,
1509 NONSTATIC_SHORT, // T_SHORT = 9,
1510 NONSTATIC_WORD, // T_INT = 10,
1511 NONSTATIC_DOUBLE, // T_LONG = 11,
1512 NONSTATIC_OOP, // T_OBJECT = 12,
1513 NONSTATIC_OOP, // T_ARRAY = 13,
1514 NONSTATIC_OOP, // T_VALUETYPE = 14,
1515 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1516 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1517 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1518 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1519 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1520 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20,
1521 BAD_ALLOCATION_TYPE, // 0
1522 BAD_ALLOCATION_TYPE, // 1
1523 BAD_ALLOCATION_TYPE, // 2
1524 BAD_ALLOCATION_TYPE, // 3
1525 STATIC_BYTE , // T_BOOLEAN = 4,
1526 STATIC_SHORT, // T_CHAR = 5,
1527 STATIC_WORD, // T_FLOAT = 6,
1528 STATIC_DOUBLE, // T_DOUBLE = 7,
1529 STATIC_BYTE, // T_BYTE = 8,
1530 STATIC_SHORT, // T_SHORT = 9,
1531 STATIC_WORD, // T_INT = 10,
1532 STATIC_DOUBLE, // T_LONG = 11,
1533 STATIC_OOP, // T_OBJECT = 12,
1534 STATIC_OOP, // T_ARRAY = 13,
1535 STATIC_OOP, // T_VALUETYPE = 14,
1536 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1537 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1538 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1539 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1540 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1541 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20
1542 };
1543
1544 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type, bool is_flattenable) {
1545 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1546 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1547 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1548 if (is_flattenable) {
1549 result = is_static ? STATIC_FLATTENABLE : NONSTATIC_FLATTENABLE;
1550 }
1551 return result;
1552 }
1553
1554 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1555 public:
1556 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1557
1558 FieldAllocationCount() {
1559 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1560 count[i] = 0;
1561 }
1562 }
1563
1564 FieldAllocationType update(bool is_static, BasicType type, bool is_flattenable) {
1565 FieldAllocationType atype = basic_type_to_atype(is_static, type, is_flattenable);
1566 if (atype != BAD_ALLOCATION_TYPE) {
1567 // Make sure there is no overflow with injected fields.
1568 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1569 count[atype]++;
1570 }
1571 return atype;
1572 }
1573 };
1574
1575 // Side-effects: populates the _fields, _fields_annotations,
1576 // _fields_type_annotations fields
1577 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1578 bool is_interface,
1579 bool is_value_type,
1580 FieldAllocationCount* const fac,
1581 ConstantPool* cp,
1582 const int cp_size,
1583 u2* const java_fields_count_ptr,
1584 TRAPS) {
1585
1586 assert(cfs != NULL, "invariant");
1587 assert(fac != NULL, "invariant");
1588 assert(cp != NULL, "invariant");
1589 assert(java_fields_count_ptr != NULL, "invariant");
1590
1591 assert(NULL == _fields, "invariant");
1592 assert(NULL == _fields_annotations, "invariant");
1593 assert(NULL == _fields_type_annotations, "invariant");
1594
1595 cfs->guarantee_more(2, CHECK); // length
1596 const u2 length = cfs->get_u2_fast();
1597 *java_fields_count_ptr = length;
1598
1599 int num_injected = 0;
1600 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1601 &num_injected);
1602
1603 const int total_fields = length + num_injected + (is_value_type ? 1 : 0);
1604
1605 // The field array starts with tuples of shorts
1606 // [access, name index, sig index, initial value index, byte offset].
1607 // A generic signature slot only exists for field with generic
1608 // signature attribute. And the access flag is set with
1609 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1610 // signature slots are at the end of the field array and after all
1611 // other fields data.
1612 //
1613 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1614 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1615 // ...
1616 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1617 // [generic signature index]
1618 // [generic signature index]
1619 // ...
1620 //
1621 // Allocate a temporary resource array for field data. For each field,
1622 // a slot is reserved in the temporary array for the generic signature
1623 // index. After parsing all fields, the data are copied to a permanent
1624 // array and any unused slots will be discarded.
1625 ResourceMark rm(THREAD);
1626 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1627 u2,
1628 total_fields * (FieldInfo::field_slots + 1));
1629
1630 // The generic signature slots start after all other fields' data.
1631 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1632 int num_generic_signature = 0;
1633 for (int n = 0; n < length; n++) {
1634 // access_flags, name_index, descriptor_index, attributes_count
1635 cfs->guarantee_more(8, CHECK);
1636
1637 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1638
1639 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1640 verify_legal_field_modifiers(flags, is_interface, is_value_type, CHECK);
1641 AccessFlags access_flags;
1642 access_flags.set_flags(flags);
1643
1644 const u2 name_index = cfs->get_u2_fast();
1645 check_property(valid_symbol_at(name_index),
1646 "Invalid constant pool index %u for field name in class file %s",
1647 name_index, CHECK);
1648 const Symbol* const name = cp->symbol_at(name_index);
1649 verify_legal_field_name(name, CHECK);
1650
1651 const u2 signature_index = cfs->get_u2_fast();
1652 check_property(valid_symbol_at(signature_index),
1653 "Invalid constant pool index %u for field signature in class file %s",
1654 signature_index, CHECK);
1655 const Symbol* const sig = cp->symbol_at(signature_index);
1656 verify_legal_field_signature(name, sig, CHECK);
1657 assert(!access_flags.is_flattenable(), "ACC_FLATTENABLE should have been filtered out");
1658 if (sig->is_Q_signature()) {
1659 // assert(_major_version >= CONSTANT_CLASS_DESCRIPTORS, "Q-descriptors are only supported in recent classfiles");
1660 access_flags.set_is_flattenable();
1661 }
1662 if (access_flags.is_flattenable()) {
1663 // Array flattenability cannot be specified. Arrays of value classes are
1664 // are always flattenable. Arrays of other classes are not flattenable.
1665 if (sig->utf8_length() > 1 && sig->char_at(0) == '[') {
1666 classfile_parse_error(
1667 "Field \"%s\" with signature \"%s\" in class file %s is invalid."
1668 " ACC_FLATTENABLE cannot be specified for an array",
1669 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1670 }
1671 _has_flattenable_fields = true;
1672 }
1673
1674 u2 constantvalue_index = 0;
1675 bool is_synthetic = false;
1676 u2 generic_signature_index = 0;
1677 const bool is_static = access_flags.is_static();
1678 FieldAnnotationCollector parsed_annotations(_loader_data);
1679
1680 const u2 attributes_count = cfs->get_u2_fast();
1681 if (attributes_count > 0) {
1682 parse_field_attributes(cfs,
1683 attributes_count,
1684 is_static,
1685 signature_index,
1686 &constantvalue_index,
1687 &is_synthetic,
1688 &generic_signature_index,
1689 &parsed_annotations,
1690 CHECK);
1691
1692 if (parsed_annotations.field_annotations() != NULL) {
1693 if (_fields_annotations == NULL) {
1694 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1695 _loader_data, length, NULL,
1696 CHECK);
1697 }
1698 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1699 parsed_annotations.set_field_annotations(NULL);
1700 }
1701 if (parsed_annotations.field_type_annotations() != NULL) {
1702 if (_fields_type_annotations == NULL) {
1703 _fields_type_annotations =
1704 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1705 length,
1706 NULL,
1707 CHECK);
1708 }
1709 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1710 parsed_annotations.set_field_type_annotations(NULL);
1711 }
1712
1713 if (is_synthetic) {
1714 access_flags.set_is_synthetic();
1715 }
1716 if (generic_signature_index != 0) {
1717 access_flags.set_field_has_generic_signature();
1718 fa[generic_signature_slot] = generic_signature_index;
1719 generic_signature_slot ++;
1720 num_generic_signature ++;
1721 }
1722 }
1723
1724 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1725 field->initialize(access_flags.as_short(),
1726 name_index,
1727 signature_index,
1728 constantvalue_index);
1729 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1730
1731 // Remember how many oops we encountered and compute allocation type
1732 const FieldAllocationType atype = fac->update(is_static, type, access_flags.is_flattenable());
1733 field->set_allocation_type(atype);
1734
1735 // After field is initialized with type, we can augment it with aux info
1736 if (parsed_annotations.has_any_annotations())
1737 parsed_annotations.apply_to(field);
1738 }
1739
1740 int index = length;
1741 if (num_injected != 0) {
1742 for (int n = 0; n < num_injected; n++) {
1743 // Check for duplicates
1744 if (injected[n].may_be_java) {
1745 const Symbol* const name = injected[n].name();
1746 const Symbol* const signature = injected[n].signature();
1747 bool duplicate = false;
1748 for (int i = 0; i < length; i++) {
1749 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1750 if (name == cp->symbol_at(f->name_index()) &&
1751 signature == cp->symbol_at(f->signature_index())) {
1752 // Symbol is desclared in Java so skip this one
1753 duplicate = true;
1754 break;
1755 }
1756 }
1757 if (duplicate) {
1758 // These will be removed from the field array at the end
1759 continue;
1760 }
1761 }
1762
1763 // Injected field
1764 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1765 field->initialize(JVM_ACC_FIELD_INTERNAL,
1766 injected[n].name_index,
1767 injected[n].signature_index,
1768 0);
1769
1770 const BasicType type = FieldType::basic_type(injected[n].signature());
1771
1772 // Remember how many oops we encountered and compute allocation type
1773 const FieldAllocationType atype = fac->update(false, type, false);
1774 field->set_allocation_type(atype);
1775 index++;
1776 }
1777 }
1778
1779 if (is_value_type) {
1780 index = length + num_injected;
1781 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1782 field->initialize(JVM_ACC_FIELD_INTERNAL | JVM_ACC_STATIC,
1783 vmSymbols::default_value_name_enum,
1784 vmSymbols::java_lang_Object_enum,
1785 0);
1786 const BasicType type = FieldType::basic_type(vmSymbols::object_signature());
1787 const FieldAllocationType atype = fac->update(true, type, false);
1788 field->set_allocation_type(atype);
1789 index++;
1790 }
1791
1792 assert(NULL == _fields, "invariant");
1793
1794 _fields =
1795 MetadataFactory::new_array<u2>(_loader_data,
1796 index * FieldInfo::field_slots + num_generic_signature,
1797 CHECK);
1798 // Sometimes injected fields already exist in the Java source so
1799 // the fields array could be too long. In that case the
1800 // fields array is trimed. Also unused slots that were reserved
1801 // for generic signature indexes are discarded.
1802 {
1803 int i = 0;
1804 for (; i < index * FieldInfo::field_slots; i++) {
1805 _fields->at_put(i, fa[i]);
1806 }
1807 for (int j = total_fields * FieldInfo::field_slots;
1808 j < generic_signature_slot; j++) {
1809 _fields->at_put(i++, fa[j]);
1810 }
1811 assert(_fields->length() == i, "");
1812 }
1813
1814 if (_need_verify && length > 1) {
1815 // Check duplicated fields
1816 ResourceMark rm(THREAD);
1817 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1818 THREAD, NameSigHash*, HASH_ROW_SIZE);
1819 initialize_hashtable(names_and_sigs);
1820 bool dup = false;
1821 const Symbol* name = NULL;
1822 const Symbol* sig = NULL;
1823 {
1824 debug_only(NoSafepointVerifier nsv;)
1825 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1826 name = fs.name();
1827 sig = fs.signature();
1828 // If no duplicates, add name/signature in hashtable names_and_sigs.
1829 if (!put_after_lookup(name, sig, names_and_sigs)) {
1830 dup = true;
1831 break;
1832 }
1833 }
1834 }
1835 if (dup) {
1836 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1837 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1838 }
1839 }
1840 }
1841
1842
1843 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1844 u4 code_length,
1845 u4 exception_table_length,
1846 TRAPS) {
1847 assert(cfs != NULL, "invariant");
1848
1849 const unsafe_u2* const exception_table_start = cfs->current();
1850 assert(exception_table_start != NULL, "null exception table");
1851
1852 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1853 // end_pc,
1854 // handler_pc,
1855 // catch_type_index
1856
1857 // Will check legal target after parsing code array in verifier.
1858 if (_need_verify) {
1859 for (unsigned int i = 0; i < exception_table_length; i++) {
1860 const u2 start_pc = cfs->get_u2_fast();
1861 const u2 end_pc = cfs->get_u2_fast();
1862 const u2 handler_pc = cfs->get_u2_fast();
1863 const u2 catch_type_index = cfs->get_u2_fast();
1864 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1865 "Illegal exception table range in class file %s",
1866 CHECK_NULL);
1867 guarantee_property(handler_pc < code_length,
1868 "Illegal exception table handler in class file %s",
1869 CHECK_NULL);
1870 if (catch_type_index != 0) {
1871 guarantee_property(valid_klass_reference_at(catch_type_index),
1872 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1873 }
1874 }
1875 } else {
1876 cfs->skip_u2_fast(exception_table_length * 4);
1877 }
1878 return exception_table_start;
1879 }
1880
1881 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1882 u4 code_length,
1883 CompressedLineNumberWriteStream**const write_stream,
1884 TRAPS) {
1885
1886 const ClassFileStream* const cfs = _stream;
1887 unsigned int num_entries = cfs->get_u2(CHECK);
1888
1889 // Each entry is a u2 start_pc, and a u2 line_number
1890 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1891
1892 // Verify line number attribute and table length
1893 check_property(
1894 code_attribute_length == sizeof(u2) + length_in_bytes,
1895 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1896
1897 cfs->guarantee_more(length_in_bytes, CHECK);
1898
1899 if ((*write_stream) == NULL) {
1900 if (length_in_bytes > fixed_buffer_size) {
1901 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1902 } else {
1903 (*write_stream) = new CompressedLineNumberWriteStream(
1904 _linenumbertable_buffer, fixed_buffer_size);
1905 }
1906 }
1907
1908 while (num_entries-- > 0) {
1909 const u2 bci = cfs->get_u2_fast(); // start_pc
1910 const u2 line = cfs->get_u2_fast(); // line_number
1911 guarantee_property(bci < code_length,
1912 "Invalid pc in LineNumberTable in class file %s", CHECK);
1913 (*write_stream)->write_pair(bci, line);
1914 }
1915 }
1916
1917
1918 class LVT_Hash : public AllStatic {
1919 public:
1920
1921 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1922 /*
1923 * 3-tuple start_bci/length/slot has to be unique key,
1924 * so the following comparison seems to be redundant:
1925 * && elem->name_cp_index == entry->_elem->name_cp_index
1926 */
1927 return (e0.start_bci == e1.start_bci &&
1928 e0.length == e1.length &&
1929 e0.name_cp_index == e1.name_cp_index &&
1930 e0.slot == e1.slot);
1931 }
1932
1933 static unsigned int hash(LocalVariableTableElement const& e0) {
1934 unsigned int raw_hash = e0.start_bci;
1935
1936 raw_hash = e0.length + raw_hash * 37;
1937 raw_hash = e0.name_cp_index + raw_hash * 37;
1938 raw_hash = e0.slot + raw_hash * 37;
1939
1940 return raw_hash;
1941 }
1942 };
1943
1944
1945 // Class file LocalVariableTable elements.
1946 class Classfile_LVT_Element {
1947 public:
1948 u2 start_bci;
1949 u2 length;
1950 u2 name_cp_index;
1951 u2 descriptor_cp_index;
1952 u2 slot;
1953 };
1954
1955 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1956 LocalVariableTableElement* const lvt) {
1957 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1958 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1959 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1960 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1961 lvt->signature_cp_index = 0;
1962 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1963 }
1964
1965 // Function is used to parse both attributes:
1966 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1967 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1968 u4 code_length,
1969 u2 max_locals,
1970 u4 code_attribute_length,
1971 u2* const localvariable_table_length,
1972 bool isLVTT,
1973 TRAPS) {
1974 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1975 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1976 const unsigned int size =
1977 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1978
1979 const ConstantPool* const cp = _cp;
1980
1981 // Verify local variable table attribute has right length
1982 if (_need_verify) {
1983 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1984 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1985 }
1986
1987 const unsafe_u2* const localvariable_table_start = cfs->current();
1988 assert(localvariable_table_start != NULL, "null local variable table");
1989 if (!_need_verify) {
1990 cfs->skip_u2_fast(size);
1991 } else {
1992 cfs->guarantee_more(size * 2, CHECK_NULL);
1993 for(int i = 0; i < (*localvariable_table_length); i++) {
1994 const u2 start_pc = cfs->get_u2_fast();
1995 const u2 length = cfs->get_u2_fast();
1996 const u2 name_index = cfs->get_u2_fast();
1997 const u2 descriptor_index = cfs->get_u2_fast();
1998 const u2 index = cfs->get_u2_fast();
1999 // Assign to a u4 to avoid overflow
2000 const u4 end_pc = (u4)start_pc + (u4)length;
2001
2002 if (start_pc >= code_length) {
2003 classfile_parse_error(
2004 "Invalid start_pc %u in %s in class file %s",
2005 start_pc, tbl_name, CHECK_NULL);
2006 }
2007 if (end_pc > code_length) {
2008 classfile_parse_error(
2009 "Invalid length %u in %s in class file %s",
2010 length, tbl_name, CHECK_NULL);
2011 }
2012 const int cp_size = cp->length();
2013 guarantee_property(valid_symbol_at(name_index),
2014 "Name index %u in %s has bad constant type in class file %s",
2015 name_index, tbl_name, CHECK_NULL);
2016 guarantee_property(valid_symbol_at(descriptor_index),
2017 "Signature index %u in %s has bad constant type in class file %s",
2018 descriptor_index, tbl_name, CHECK_NULL);
2019
2020 const Symbol* const name = cp->symbol_at(name_index);
2021 const Symbol* const sig = cp->symbol_at(descriptor_index);
2022 verify_legal_field_name(name, CHECK_NULL);
2023 u2 extra_slot = 0;
2024 if (!isLVTT) {
2025 verify_legal_field_signature(name, sig, CHECK_NULL);
2026
2027 // 4894874: check special cases for double and long local variables
2028 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
2029 sig == vmSymbols::type_signature(T_LONG)) {
2030 extra_slot = 1;
2031 }
2032 }
2033 guarantee_property((index + extra_slot) < max_locals,
2034 "Invalid index %u in %s in class file %s",
2035 index, tbl_name, CHECK_NULL);
2036 }
2037 }
2038 return localvariable_table_start;
2039 }
2040
2041 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
2042 u4 code_attribute_length,
2043 bool need_verify,
2044 TRAPS) {
2045 assert(cfs != NULL, "invariant");
2046
2047 if (0 == code_attribute_length) {
2048 return NULL;
2049 }
2050
2051 const u1* const stackmap_table_start = cfs->current();
2052 assert(stackmap_table_start != NULL, "null stackmap table");
2053
2054 // check code_attribute_length first
2055 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2056
2057 if (!need_verify && !DumpSharedSpaces) {
2058 return NULL;
2059 }
2060 return stackmap_table_start;
2061 }
2062
2063 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2064 u2* const checked_exceptions_length,
2065 u4 method_attribute_length,
2066 TRAPS) {
2067 assert(cfs != NULL, "invariant");
2068 assert(checked_exceptions_length != NULL, "invariant");
2069
2070 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2071 *checked_exceptions_length = cfs->get_u2_fast();
2072 const unsigned int size =
2073 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2074 const unsafe_u2* const checked_exceptions_start = cfs->current();
2075 assert(checked_exceptions_start != NULL, "null checked exceptions");
2076 if (!_need_verify) {
2077 cfs->skip_u2_fast(size);
2078 } else {
2079 // Verify each value in the checked exception table
2080 u2 checked_exception;
2081 const u2 len = *checked_exceptions_length;
2082 cfs->guarantee_more(2 * len, CHECK_NULL);
2083 for (int i = 0; i < len; i++) {
2084 checked_exception = cfs->get_u2_fast();
2085 check_property(
2086 valid_klass_reference_at(checked_exception),
2087 "Exception name has bad type at constant pool %u in class file %s",
2088 checked_exception, CHECK_NULL);
2089 }
2090 }
2091 // check exceptions attribute length
2092 if (_need_verify) {
2093 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2094 sizeof(u2) * size),
2095 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2096 }
2097 return checked_exceptions_start;
2098 }
2099
2100 void ClassFileParser::throwIllegalSignature(const char* type,
2101 const Symbol* name,
2102 const Symbol* sig,
2103 TRAPS) const {
2104 assert(name != NULL, "invariant");
2105 assert(sig != NULL, "invariant");
2106
2107 const char* class_note = "";
2108 if (is_value_type() && name == vmSymbols::object_initializer_name()) {
2109 class_note = " (an inline class)";
2110 }
2111
2112 ResourceMark rm(THREAD);
2113 Exceptions::fthrow(THREAD_AND_LOCATION,
2114 vmSymbols::java_lang_ClassFormatError(),
2115 "%s \"%s\" in class %s%s has illegal signature \"%s\"", type,
2116 name->as_C_string(), _class_name->as_C_string(), class_note, sig->as_C_string());
2117 }
2118
2119 AnnotationCollector::ID
2120 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2121 const Symbol* name) {
2122 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2123 // Privileged code can use all annotations. Other code silently drops some.
2124 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2125 loader_data->is_platform_class_loader_data() ||
2126 loader_data->is_unsafe_anonymous();
2127 switch (sid) {
2128 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2129 if (_location != _in_method) break; // only allow for methods
2130 if (!privileged) break; // only allow in privileged code
2131 return _method_CallerSensitive;
2132 }
2133 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2134 if (_location != _in_method) break; // only allow for methods
2135 if (!privileged) break; // only allow in privileged code
2136 return _method_ForceInline;
2137 }
2138 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2139 if (_location != _in_method) break; // only allow for methods
2140 if (!privileged) break; // only allow in privileged code
2141 return _method_DontInline;
2142 }
2143 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2144 if (_location != _in_method) break; // only allow for methods
2145 if (!privileged) break; // only allow in privileged code
2146 return _method_InjectedProfile;
2147 }
2148 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2149 if (_location != _in_method) break; // only allow for methods
2150 if (!privileged) break; // only allow in privileged code
2151 return _method_LambdaForm_Compiled;
2152 }
2153 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
2154 if (_location != _in_method) break; // only allow for methods
2155 if (!privileged) break; // only allow in privileged code
2156 return _method_Hidden;
2157 }
2158 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2159 if (_location != _in_method) break; // only allow for methods
2160 if (!privileged) break; // only allow in privileged code
2161 return _method_HotSpotIntrinsicCandidate;
2162 }
2163 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2164 if (_location != _in_field) break; // only allow for fields
2165 if (!privileged) break; // only allow in privileged code
2166 return _field_Stable;
2167 }
2168 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2169 if (_location != _in_field && _location != _in_class) {
2170 break; // only allow for fields and classes
2171 }
2172 if (!EnableContended || (RestrictContended && !privileged)) {
2173 break; // honor privileges
2174 }
2175 return _jdk_internal_vm_annotation_Contended;
2176 }
2177 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2178 if (_location != _in_method) break; // only allow for methods
2179 if (RestrictReservedStack && !privileged) break; // honor privileges
2180 return _jdk_internal_vm_annotation_ReservedStackAccess;
2181 }
2182 default: {
2183 break;
2184 }
2185 }
2186 return AnnotationCollector::_unknown;
2187 }
2188
2189 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2190 if (is_contended())
2191 f->set_contended_group(contended_group());
2192 if (is_stable())
2193 f->set_stable(true);
2194 }
2195
2196 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2197 // If there's an error deallocate metadata for field annotations
2198 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2199 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2200 }
2201
2202 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2203 if (has_annotation(_method_CallerSensitive))
2204 m->set_caller_sensitive(true);
2205 if (has_annotation(_method_ForceInline))
2206 m->set_force_inline(true);
2207 if (has_annotation(_method_DontInline))
2208 m->set_dont_inline(true);
2209 if (has_annotation(_method_InjectedProfile))
2210 m->set_has_injected_profile(true);
2211 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2212 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2213 if (has_annotation(_method_Hidden))
2214 m->set_hidden(true);
2215 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2216 m->set_intrinsic_candidate(true);
2217 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2218 m->set_has_reserved_stack_access(true);
2219 }
2220
2221 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2222 assert(ik != NULL, "invariant");
2223 ik->set_is_contended(is_contended());
2224 }
2225
2226 #define MAX_ARGS_SIZE 255
2227 #define MAX_CODE_SIZE 65535
2228 #define INITIAL_MAX_LVT_NUMBER 256
2229
2230 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2231 *
2232 * Rules for LVT's and LVTT's are:
2233 * - There can be any number of LVT's and LVTT's.
2234 * - If there are n LVT's, it is the same as if there was just
2235 * one LVT containing all the entries from the n LVT's.
2236 * - There may be no more than one LVT entry per local variable.
2237 * Two LVT entries are 'equal' if these fields are the same:
2238 * start_pc, length, name, slot
2239 * - There may be no more than one LVTT entry per each LVT entry.
2240 * Each LVTT entry has to match some LVT entry.
2241 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2242 */
2243 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2244 int lvt_cnt,
2245 u2* const localvariable_table_length,
2246 const unsafe_u2** const localvariable_table_start,
2247 int lvtt_cnt,
2248 u2* const localvariable_type_table_length,
2249 const unsafe_u2** const localvariable_type_table_start,
2250 TRAPS) {
2251
2252 ResourceMark rm(THREAD);
2253
2254 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2255 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2256
2257 LVT_HashTable* const table = new LVT_HashTable();
2258
2259 // To fill LocalVariableTable in
2260 const Classfile_LVT_Element* cf_lvt;
2261 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2262
2263 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2264 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2265 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2266 copy_lvt_element(&cf_lvt[idx], lvt);
2267 // If no duplicates, add LVT elem in hashtable.
2268 if (table->put(*lvt, lvt) == false
2269 && _need_verify
2270 && _major_version >= JAVA_1_5_VERSION) {
2271 classfile_parse_error("Duplicated LocalVariableTable attribute "
2272 "entry for '%s' in class file %s",
2273 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2274 CHECK);
2275 }
2276 }
2277 }
2278
2279 // To merge LocalVariableTable and LocalVariableTypeTable
2280 const Classfile_LVT_Element* cf_lvtt;
2281 LocalVariableTableElement lvtt_elem;
2282
2283 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2284 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2285 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2286 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2287 LocalVariableTableElement** entry = table->get(lvtt_elem);
2288 if (entry == NULL) {
2289 if (_need_verify) {
2290 classfile_parse_error("LVTT entry for '%s' in class file %s "
2291 "does not match any LVT entry",
2292 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2293 CHECK);
2294 }
2295 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2296 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2297 "entry for '%s' in class file %s",
2298 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2299 CHECK);
2300 } else {
2301 // to add generic signatures into LocalVariableTable
2302 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2303 }
2304 }
2305 }
2306 }
2307
2308
2309 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2310 const u1* runtime_visible_annotations,
2311 int runtime_visible_annotations_length,
2312 const u1* runtime_invisible_annotations,
2313 int runtime_invisible_annotations_length,
2314 const u1* runtime_visible_parameter_annotations,
2315 int runtime_visible_parameter_annotations_length,
2316 const u1* runtime_invisible_parameter_annotations,
2317 int runtime_invisible_parameter_annotations_length,
2318 const u1* runtime_visible_type_annotations,
2319 int runtime_visible_type_annotations_length,
2320 const u1* runtime_invisible_type_annotations,
2321 int runtime_invisible_type_annotations_length,
2322 const u1* annotation_default,
2323 int annotation_default_length,
2324 TRAPS) {
2325
2326 AnnotationArray* a;
2327
2328 if (runtime_visible_annotations_length +
2329 runtime_invisible_annotations_length > 0) {
2330 a = assemble_annotations(runtime_visible_annotations,
2331 runtime_visible_annotations_length,
2332 runtime_invisible_annotations,
2333 runtime_invisible_annotations_length,
2334 CHECK);
2335 cm->set_method_annotations(a);
2336 }
2337
2338 if (runtime_visible_parameter_annotations_length +
2339 runtime_invisible_parameter_annotations_length > 0) {
2340 a = assemble_annotations(runtime_visible_parameter_annotations,
2341 runtime_visible_parameter_annotations_length,
2342 runtime_invisible_parameter_annotations,
2343 runtime_invisible_parameter_annotations_length,
2344 CHECK);
2345 cm->set_parameter_annotations(a);
2346 }
2347
2348 if (annotation_default_length > 0) {
2349 a = assemble_annotations(annotation_default,
2350 annotation_default_length,
2351 NULL,
2352 0,
2353 CHECK);
2354 cm->set_default_annotations(a);
2355 }
2356
2357 if (runtime_visible_type_annotations_length +
2358 runtime_invisible_type_annotations_length > 0) {
2359 a = assemble_annotations(runtime_visible_type_annotations,
2360 runtime_visible_type_annotations_length,
2361 runtime_invisible_type_annotations,
2362 runtime_invisible_type_annotations_length,
2363 CHECK);
2364 cm->set_type_annotations(a);
2365 }
2366 }
2367
2368
2369 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2370 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2371 // Method* to save footprint, so we only know the size of the resulting Method* when the
2372 // entire method attribute is parsed.
2373 //
2374 // The promoted_flags parameter is used to pass relevant access_flags
2375 // from the method back up to the containing klass. These flag values
2376 // are added to klass's access_flags.
2377
2378 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2379 bool is_interface,
2380 bool is_value_type,
2381 const ConstantPool* cp,
2382 AccessFlags* const promoted_flags,
2383 TRAPS) {
2384 assert(cfs != NULL, "invariant");
2385 assert(cp != NULL, "invariant");
2386 assert(promoted_flags != NULL, "invariant");
2387
2388 ResourceMark rm(THREAD);
2389 // Parse fixed parts:
2390 // access_flags, name_index, descriptor_index, attributes_count
2391 cfs->guarantee_more(8, CHECK_NULL);
2392
2393 int flags = cfs->get_u2_fast();
2394 const u2 name_index = cfs->get_u2_fast();
2395 const int cp_size = cp->length();
2396 check_property(
2397 valid_symbol_at(name_index),
2398 "Illegal constant pool index %u for method name in class file %s",
2399 name_index, CHECK_NULL);
2400 const Symbol* const name = cp->symbol_at(name_index);
2401 verify_legal_method_name(name, CHECK_NULL);
2402
2403 const u2 signature_index = cfs->get_u2_fast();
2404 guarantee_property(
2405 valid_symbol_at(signature_index),
2406 "Illegal constant pool index %u for method signature in class file %s",
2407 signature_index, CHECK_NULL);
2408 const Symbol* const signature = cp->symbol_at(signature_index);
2409
2410 if (name == vmSymbols::class_initializer_name()) {
2411 // We ignore the other access flags for a valid class initializer.
2412 // (JVM Spec 2nd ed., chapter 4.6)
2413 if (_major_version < 51) { // backward compatibility
2414 flags = JVM_ACC_STATIC;
2415 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2416 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2417 } else {
2418 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2419 }
2420 } else {
2421 verify_legal_method_modifiers(flags, is_interface, is_value_type, name, CHECK_NULL);
2422 }
2423
2424 if (name == vmSymbols::object_initializer_name()) {
2425 if (is_interface) {
2426 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2427 } else if (!is_value_type && signature->is_void_method_signature()) {
2428 // OK, a constructor
2429 } else if (is_value_type && !signature->is_void_method_signature()) {
2430 // also OK, a static factory, as long as the return value is good
2431 bool ok = false;
2432 SignatureStream ss((Symbol*) signature, true);
2433 while (!ss.at_return_type()) ss.next();
2434 if (ss.is_object()) {
2435 TempNewSymbol ret = ss.as_symbol_or_null();
2436 const Symbol* required = class_name();
2437 if (is_unsafe_anonymous()) {
2438 // nobody can mention such a class name
2439 required = vmSymbols::java_lang_Object();
2440 }
2441 ok = (ret == required);
2442 }
2443 if (!ok) {
2444 throwIllegalSignature("Method", name, signature, CHECK_0);
2445 }
2446 } else {
2447 // not OK, so throw the same error as in verify_legal_method_signature.
2448 throwIllegalSignature("Method", name, signature, CHECK_0);
2449 }
2450 // A declared <init> method must always be either a non-static
2451 // object constructor, with a void return, or else it must be a
2452 // static factory method, with a non-void return. No other
2453 // definition of <init> is possible.
2454 //
2455 // The verifier (in verify_invoke_instructions) will inspect the
2456 // signature of any attempt to invoke <init>, and ensures that it
2457 // returns non-void if and only if it is being invoked by
2458 // invokestatic, and void if and only if it is being invoked by
2459 // invokespecial.
2460 //
2461 // When a symbolic reference to <init> is resolved for a
2462 // particular invocation mode (special or static), the mode is
2463 // matched to the JVM_ACC_STATIC modifier of the <init> method.
2464 // Thus, it is impossible to statically invoke a constructor, and
2465 // impossible to "new + invokespecial" a static factory, either
2466 // through bytecode or through reflection.
2467 }
2468
2469 int args_size = -1; // only used when _need_verify is true
2470 if (_need_verify) {
2471 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2472 verify_legal_method_signature(name, signature, CHECK_NULL);
2473 if (args_size > MAX_ARGS_SIZE) {
2474 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2475 }
2476 }
2477
2478 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2479
2480 // Default values for code and exceptions attribute elements
2481 u2 max_stack = 0;
2482 u2 max_locals = 0;
2483 u4 code_length = 0;
2484 const u1* code_start = 0;
2485 u2 exception_table_length = 0;
2486 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2487 Array<int>* exception_handlers = Universe::the_empty_int_array();
2488 u2 checked_exceptions_length = 0;
2489 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2490 CompressedLineNumberWriteStream* linenumber_table = NULL;
2491 int linenumber_table_length = 0;
2492 int total_lvt_length = 0;
2493 u2 lvt_cnt = 0;
2494 u2 lvtt_cnt = 0;
2495 bool lvt_allocated = false;
2496 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2497 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2498 u2* localvariable_table_length = NULL;
2499 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2500 u2* localvariable_type_table_length = NULL;
2501 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2502 int method_parameters_length = -1;
2503 const u1* method_parameters_data = NULL;
2504 bool method_parameters_seen = false;
2505 bool parsed_code_attribute = false;
2506 bool parsed_checked_exceptions_attribute = false;
2507 bool parsed_stackmap_attribute = false;
2508 // stackmap attribute - JDK1.5
2509 const u1* stackmap_data = NULL;
2510 int stackmap_data_length = 0;
2511 u2 generic_signature_index = 0;
2512 MethodAnnotationCollector parsed_annotations;
2513 const u1* runtime_visible_annotations = NULL;
2514 int runtime_visible_annotations_length = 0;
2515 const u1* runtime_invisible_annotations = NULL;
2516 int runtime_invisible_annotations_length = 0;
2517 const u1* runtime_visible_parameter_annotations = NULL;
2518 int runtime_visible_parameter_annotations_length = 0;
2519 const u1* runtime_invisible_parameter_annotations = NULL;
2520 int runtime_invisible_parameter_annotations_length = 0;
2521 const u1* runtime_visible_type_annotations = NULL;
2522 int runtime_visible_type_annotations_length = 0;
2523 const u1* runtime_invisible_type_annotations = NULL;
2524 int runtime_invisible_type_annotations_length = 0;
2525 bool runtime_invisible_annotations_exists = false;
2526 bool runtime_invisible_type_annotations_exists = false;
2527 bool runtime_invisible_parameter_annotations_exists = false;
2528 const u1* annotation_default = NULL;
2529 int annotation_default_length = 0;
2530
2531 // Parse code and exceptions attribute
2532 u2 method_attributes_count = cfs->get_u2_fast();
2533 while (method_attributes_count--) {
2534 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2535 const u2 method_attribute_name_index = cfs->get_u2_fast();
2536 const u4 method_attribute_length = cfs->get_u4_fast();
2537 check_property(
2538 valid_symbol_at(method_attribute_name_index),
2539 "Invalid method attribute name index %u in class file %s",
2540 method_attribute_name_index, CHECK_NULL);
2541
2542 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2543 if (method_attribute_name == vmSymbols::tag_code()) {
2544 // Parse Code attribute
2545 if (_need_verify) {
2546 guarantee_property(
2547 !access_flags.is_native() && !access_flags.is_abstract(),
2548 "Code attribute in native or abstract methods in class file %s",
2549 CHECK_NULL);
2550 }
2551 if (parsed_code_attribute) {
2552 classfile_parse_error("Multiple Code attributes in class file %s",
2553 CHECK_NULL);
2554 }
2555 parsed_code_attribute = true;
2556
2557 // Stack size, locals size, and code size
2558 if (_major_version == 45 && _minor_version <= 2) {
2559 cfs->guarantee_more(4, CHECK_NULL);
2560 max_stack = cfs->get_u1_fast();
2561 max_locals = cfs->get_u1_fast();
2562 code_length = cfs->get_u2_fast();
2563 } else {
2564 cfs->guarantee_more(8, CHECK_NULL);
2565 max_stack = cfs->get_u2_fast();
2566 max_locals = cfs->get_u2_fast();
2567 code_length = cfs->get_u4_fast();
2568 }
2569 if (_need_verify) {
2570 guarantee_property(args_size <= max_locals,
2571 "Arguments can't fit into locals in class file %s",
2572 CHECK_NULL);
2573 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2574 "Invalid method Code length %u in class file %s",
2575 code_length, CHECK_NULL);
2576 }
2577 // Code pointer
2578 code_start = cfs->current();
2579 assert(code_start != NULL, "null code start");
2580 cfs->guarantee_more(code_length, CHECK_NULL);
2581 cfs->skip_u1_fast(code_length);
2582
2583 // Exception handler table
2584 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2585 exception_table_length = cfs->get_u2_fast();
2586 if (exception_table_length > 0) {
2587 exception_table_start = parse_exception_table(cfs,
2588 code_length,
2589 exception_table_length,
2590 CHECK_NULL);
2591 }
2592
2593 // Parse additional attributes in code attribute
2594 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2595 u2 code_attributes_count = cfs->get_u2_fast();
2596
2597 unsigned int calculated_attribute_length = 0;
2598
2599 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2600 calculated_attribute_length =
2601 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2602 } else {
2603 // max_stack, locals and length are smaller in pre-version 45.2 classes
2604 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2605 }
2606 calculated_attribute_length +=
2607 code_length +
2608 sizeof(exception_table_length) +
2609 sizeof(code_attributes_count) +
2610 exception_table_length *
2611 ( sizeof(u2) + // start_pc
2612 sizeof(u2) + // end_pc
2613 sizeof(u2) + // handler_pc
2614 sizeof(u2) ); // catch_type_index
2615
2616 while (code_attributes_count--) {
2617 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2618 const u2 code_attribute_name_index = cfs->get_u2_fast();
2619 const u4 code_attribute_length = cfs->get_u4_fast();
2620 calculated_attribute_length += code_attribute_length +
2621 sizeof(code_attribute_name_index) +
2622 sizeof(code_attribute_length);
2623 check_property(valid_symbol_at(code_attribute_name_index),
2624 "Invalid code attribute name index %u in class file %s",
2625 code_attribute_name_index,
2626 CHECK_NULL);
2627 if (LoadLineNumberTables &&
2628 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2629 // Parse and compress line number table
2630 parse_linenumber_table(code_attribute_length,
2631 code_length,
2632 &linenumber_table,
2633 CHECK_NULL);
2634
2635 } else if (LoadLocalVariableTables &&
2636 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2637 // Parse local variable table
2638 if (!lvt_allocated) {
2639 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2640 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2641 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2642 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2643 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2644 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2645 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2646 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2647 lvt_allocated = true;
2648 }
2649 if (lvt_cnt == max_lvt_cnt) {
2650 max_lvt_cnt <<= 1;
2651 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2652 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2653 }
2654 localvariable_table_start[lvt_cnt] =
2655 parse_localvariable_table(cfs,
2656 code_length,
2657 max_locals,
2658 code_attribute_length,
2659 &localvariable_table_length[lvt_cnt],
2660 false, // is not LVTT
2661 CHECK_NULL);
2662 total_lvt_length += localvariable_table_length[lvt_cnt];
2663 lvt_cnt++;
2664 } else if (LoadLocalVariableTypeTables &&
2665 _major_version >= JAVA_1_5_VERSION &&
2666 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2667 if (!lvt_allocated) {
2668 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2669 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2670 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2671 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2672 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2673 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2674 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2675 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2676 lvt_allocated = true;
2677 }
2678 // Parse local variable type table
2679 if (lvtt_cnt == max_lvtt_cnt) {
2680 max_lvtt_cnt <<= 1;
2681 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2682 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2683 }
2684 localvariable_type_table_start[lvtt_cnt] =
2685 parse_localvariable_table(cfs,
2686 code_length,
2687 max_locals,
2688 code_attribute_length,
2689 &localvariable_type_table_length[lvtt_cnt],
2690 true, // is LVTT
2691 CHECK_NULL);
2692 lvtt_cnt++;
2693 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2694 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2695 // Stack map is only needed by the new verifier in JDK1.5.
2696 if (parsed_stackmap_attribute) {
2697 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2698 }
2699 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2700 stackmap_data_length = code_attribute_length;
2701 parsed_stackmap_attribute = true;
2702 } else {
2703 // Skip unknown attributes
2704 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2705 }
2706 }
2707 // check method attribute length
2708 if (_need_verify) {
2709 guarantee_property(method_attribute_length == calculated_attribute_length,
2710 "Code segment has wrong length in class file %s",
2711 CHECK_NULL);
2712 }
2713 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2714 // Parse Exceptions attribute
2715 if (parsed_checked_exceptions_attribute) {
2716 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2717 CHECK_NULL);
2718 }
2719 parsed_checked_exceptions_attribute = true;
2720 checked_exceptions_start =
2721 parse_checked_exceptions(cfs,
2722 &checked_exceptions_length,
2723 method_attribute_length,
2724 CHECK_NULL);
2725 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2726 // reject multiple method parameters
2727 if (method_parameters_seen) {
2728 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2729 CHECK_NULL);
2730 }
2731 method_parameters_seen = true;
2732 method_parameters_length = cfs->get_u1_fast();
2733 const u2 real_length = (method_parameters_length * 4u) + 1u;
2734 if (method_attribute_length != real_length) {
2735 classfile_parse_error(
2736 "Invalid MethodParameters method attribute length %u in class file",
2737 method_attribute_length, CHECK_NULL);
2738 }
2739 method_parameters_data = cfs->current();
2740 cfs->skip_u2_fast(method_parameters_length);
2741 cfs->skip_u2_fast(method_parameters_length);
2742 // ignore this attribute if it cannot be reflected
2743 if (!SystemDictionary::Parameter_klass_loaded())
2744 method_parameters_length = -1;
2745 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2746 if (method_attribute_length != 0) {
2747 classfile_parse_error(
2748 "Invalid Synthetic method attribute length %u in class file %s",
2749 method_attribute_length, CHECK_NULL);
2750 }
2751 // Should we check that there hasn't already been a synthetic attribute?
2752 access_flags.set_is_synthetic();
2753 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2754 if (method_attribute_length != 0) {
2755 classfile_parse_error(
2756 "Invalid Deprecated method attribute length %u in class file %s",
2757 method_attribute_length, CHECK_NULL);
2758 }
2759 } else if (_major_version >= JAVA_1_5_VERSION) {
2760 if (method_attribute_name == vmSymbols::tag_signature()) {
2761 if (generic_signature_index != 0) {
2762 classfile_parse_error(
2763 "Multiple Signature attributes for method in class file %s",
2764 CHECK_NULL);
2765 }
2766 if (method_attribute_length != 2) {
2767 classfile_parse_error(
2768 "Invalid Signature attribute length %u in class file %s",
2769 method_attribute_length, CHECK_NULL);
2770 }
2771 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2772 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2773 if (runtime_visible_annotations != NULL) {
2774 classfile_parse_error(
2775 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2776 CHECK_NULL);
2777 }
2778 runtime_visible_annotations_length = method_attribute_length;
2779 runtime_visible_annotations = cfs->current();
2780 assert(runtime_visible_annotations != NULL, "null visible annotations");
2781 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2782 parse_annotations(cp,
2783 runtime_visible_annotations,
2784 runtime_visible_annotations_length,
2785 &parsed_annotations,
2786 _loader_data,
2787 CHECK_NULL);
2788 cfs->skip_u1_fast(runtime_visible_annotations_length);
2789 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2790 if (runtime_invisible_annotations_exists) {
2791 classfile_parse_error(
2792 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2793 CHECK_NULL);
2794 }
2795 runtime_invisible_annotations_exists = true;
2796 if (PreserveAllAnnotations) {
2797 runtime_invisible_annotations_length = method_attribute_length;
2798 runtime_invisible_annotations = cfs->current();
2799 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2800 }
2801 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2802 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2803 if (runtime_visible_parameter_annotations != NULL) {
2804 classfile_parse_error(
2805 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2806 CHECK_NULL);
2807 }
2808 runtime_visible_parameter_annotations_length = method_attribute_length;
2809 runtime_visible_parameter_annotations = cfs->current();
2810 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2811 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2812 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2813 if (runtime_invisible_parameter_annotations_exists) {
2814 classfile_parse_error(
2815 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2816 CHECK_NULL);
2817 }
2818 runtime_invisible_parameter_annotations_exists = true;
2819 if (PreserveAllAnnotations) {
2820 runtime_invisible_parameter_annotations_length = method_attribute_length;
2821 runtime_invisible_parameter_annotations = cfs->current();
2822 assert(runtime_invisible_parameter_annotations != NULL,
2823 "null invisible parameter annotations");
2824 }
2825 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2826 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2827 if (annotation_default != NULL) {
2828 classfile_parse_error(
2829 "Multiple AnnotationDefault attributes for method in class file %s",
2830 CHECK_NULL);
2831 }
2832 annotation_default_length = method_attribute_length;
2833 annotation_default = cfs->current();
2834 assert(annotation_default != NULL, "null annotation default");
2835 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2836 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2837 if (runtime_visible_type_annotations != NULL) {
2838 classfile_parse_error(
2839 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2840 CHECK_NULL);
2841 }
2842 runtime_visible_type_annotations_length = method_attribute_length;
2843 runtime_visible_type_annotations = cfs->current();
2844 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2845 // No need for the VM to parse Type annotations
2846 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2847 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2848 if (runtime_invisible_type_annotations_exists) {
2849 classfile_parse_error(
2850 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2851 CHECK_NULL);
2852 } else {
2853 runtime_invisible_type_annotations_exists = true;
2854 }
2855 if (PreserveAllAnnotations) {
2856 runtime_invisible_type_annotations_length = method_attribute_length;
2857 runtime_invisible_type_annotations = cfs->current();
2858 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2859 }
2860 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2861 } else {
2862 // Skip unknown attributes
2863 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2864 }
2865 } else {
2866 // Skip unknown attributes
2867 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2868 }
2869 }
2870
2871 if (linenumber_table != NULL) {
2872 linenumber_table->write_terminator();
2873 linenumber_table_length = linenumber_table->position();
2874 }
2875
2876 // Make sure there's at least one Code attribute in non-native/non-abstract method
2877 if (_need_verify) {
2878 guarantee_property(access_flags.is_native() ||
2879 access_flags.is_abstract() ||
2880 parsed_code_attribute,
2881 "Absent Code attribute in method that is not native or abstract in class file %s",
2882 CHECK_NULL);
2883 }
2884
2885 // All sizing information for a Method* is finally available, now create it
2886 InlineTableSizes sizes(
2887 total_lvt_length,
2888 linenumber_table_length,
2889 exception_table_length,
2890 checked_exceptions_length,
2891 method_parameters_length,
2892 generic_signature_index,
2893 runtime_visible_annotations_length +
2894 runtime_invisible_annotations_length,
2895 runtime_visible_parameter_annotations_length +
2896 runtime_invisible_parameter_annotations_length,
2897 runtime_visible_type_annotations_length +
2898 runtime_invisible_type_annotations_length,
2899 annotation_default_length,
2900 0);
2901
2902 Method* const m = Method::allocate(_loader_data,
2903 code_length,
2904 access_flags,
2905 &sizes,
2906 ConstMethod::NORMAL,
2907 CHECK_NULL);
2908
2909 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2910
2911 // Fill in information from fixed part (access_flags already set)
2912 m->set_constants(_cp);
2913 m->set_name_index(name_index);
2914 m->set_signature_index(signature_index);
2915
2916 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2917 m->constMethod()->set_result_type(rtf.type());
2918
2919 if (args_size >= 0) {
2920 m->set_size_of_parameters(args_size);
2921 } else {
2922 m->compute_size_of_parameters(THREAD);
2923 }
2924 #ifdef ASSERT
2925 if (args_size >= 0) {
2926 m->compute_size_of_parameters(THREAD);
2927 assert(args_size == m->size_of_parameters(), "");
2928 }
2929 #endif
2930
2931 // Fill in code attribute information
2932 m->set_max_stack(max_stack);
2933 m->set_max_locals(max_locals);
2934 if (stackmap_data != NULL) {
2935 m->constMethod()->copy_stackmap_data(_loader_data,
2936 (u1*)stackmap_data,
2937 stackmap_data_length,
2938 CHECK_NULL);
2939 }
2940
2941 // Copy byte codes
2942 m->set_code((u1*)code_start);
2943
2944 // Copy line number table
2945 if (linenumber_table != NULL) {
2946 memcpy(m->compressed_linenumber_table(),
2947 linenumber_table->buffer(),
2948 linenumber_table_length);
2949 }
2950
2951 // Copy exception table
2952 if (exception_table_length > 0) {
2953 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2954 m->exception_table_start(),
2955 exception_table_length * sizeof(ExceptionTableElement),
2956 sizeof(u2));
2957 }
2958
2959 // Copy method parameters
2960 if (method_parameters_length > 0) {
2961 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2962 for (int i = 0; i < method_parameters_length; i++) {
2963 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2964 method_parameters_data += 2;
2965 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2966 method_parameters_data += 2;
2967 }
2968 }
2969
2970 // Copy checked exceptions
2971 if (checked_exceptions_length > 0) {
2972 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2973 m->checked_exceptions_start(),
2974 checked_exceptions_length * sizeof(CheckedExceptionElement),
2975 sizeof(u2));
2976 }
2977
2978 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2979 if (total_lvt_length > 0) {
2980 promoted_flags->set_has_localvariable_table();
2981 copy_localvariable_table(m->constMethod(),
2982 lvt_cnt,
2983 localvariable_table_length,
2984 localvariable_table_start,
2985 lvtt_cnt,
2986 localvariable_type_table_length,
2987 localvariable_type_table_start,
2988 CHECK_NULL);
2989 }
2990
2991 if (parsed_annotations.has_any_annotations())
2992 parsed_annotations.apply_to(m);
2993
2994 // Copy annotations
2995 copy_method_annotations(m->constMethod(),
2996 runtime_visible_annotations,
2997 runtime_visible_annotations_length,
2998 runtime_invisible_annotations,
2999 runtime_invisible_annotations_length,
3000 runtime_visible_parameter_annotations,
3001 runtime_visible_parameter_annotations_length,
3002 runtime_invisible_parameter_annotations,
3003 runtime_invisible_parameter_annotations_length,
3004 runtime_visible_type_annotations,
3005 runtime_visible_type_annotations_length,
3006 runtime_invisible_type_annotations,
3007 runtime_invisible_type_annotations_length,
3008 annotation_default,
3009 annotation_default_length,
3010 CHECK_NULL);
3011
3012 if (name == vmSymbols::finalize_method_name() &&
3013 signature == vmSymbols::void_method_signature()) {
3014 if (m->is_empty_method()) {
3015 _has_empty_finalizer = true;
3016 } else {
3017 _has_finalizer = true;
3018 }
3019 }
3020 if (name == vmSymbols::object_initializer_name() &&
3021 signature == vmSymbols::void_method_signature() &&
3022 m->is_vanilla_constructor()) {
3023 _has_vanilla_constructor = true;
3024 }
3025
3026 NOT_PRODUCT(m->verify());
3027 return m;
3028 }
3029
3030
3031 // The promoted_flags parameter is used to pass relevant access_flags
3032 // from the methods back up to the containing klass. These flag values
3033 // are added to klass's access_flags.
3034 // Side-effects: populates the _methods field in the parser
3035 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
3036 bool is_interface,
3037 bool is_value_type,
3038 AccessFlags* promoted_flags,
3039 bool* has_final_method,
3040 bool* declares_nonstatic_concrete_methods,
3041 TRAPS) {
3042 assert(cfs != NULL, "invariant");
3043 assert(promoted_flags != NULL, "invariant");
3044 assert(has_final_method != NULL, "invariant");
3045 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
3046
3047 assert(NULL == _methods, "invariant");
3048
3049 cfs->guarantee_more(2, CHECK); // length
3050 const u2 length = cfs->get_u2_fast();
3051 if (length == 0) {
3052 _methods = Universe::the_empty_method_array();
3053 } else {
3054 _methods = MetadataFactory::new_array<Method*>(_loader_data,
3055 length,
3056 NULL,
3057 CHECK);
3058
3059 for (int index = 0; index < length; index++) {
3060 Method* method = parse_method(cfs,
3061 is_interface,
3062 is_value_type,
3063 _cp,
3064 promoted_flags,
3065 CHECK);
3066
3067 if (method->is_final()) {
3068 *has_final_method = true;
3069 }
3070 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
3071 // used for interface initialization, and default method inheritance analysis
3072 if (is_interface && !(*declares_nonstatic_concrete_methods)
3073 && !method->is_abstract() && !method->is_static()) {
3074 *declares_nonstatic_concrete_methods = true;
3075 }
3076 _methods->at_put(index, method);
3077 }
3078
3079 if (_need_verify && length > 1) {
3080 // Check duplicated methods
3081 ResourceMark rm(THREAD);
3082 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
3083 THREAD, NameSigHash*, HASH_ROW_SIZE);
3084 initialize_hashtable(names_and_sigs);
3085 bool dup = false;
3086 const Symbol* name = NULL;
3087 const Symbol* sig = NULL;
3088 {
3089 debug_only(NoSafepointVerifier nsv;)
3090 for (int i = 0; i < length; i++) {
3091 const Method* const m = _methods->at(i);
3092 name = m->name();
3093 sig = m->signature();
3094 // If no duplicates, add name/signature in hashtable names_and_sigs.
3095 if (!put_after_lookup(name, sig, names_and_sigs)) {
3096 dup = true;
3097 break;
3098 }
3099 }
3100 }
3101 if (dup) {
3102 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
3103 name->as_C_string(), sig->as_klass_external_name(), CHECK);
3104 }
3105 }
3106 }
3107 }
3108
3109 static const intArray* sort_methods(Array<Method*>* methods) {
3110 const int length = methods->length();
3111 // If JVMTI original method ordering or sharing is enabled we have to
3112 // remember the original class file ordering.
3113 // We temporarily use the vtable_index field in the Method* to store the
3114 // class file index, so we can read in after calling qsort.
3115 // Put the method ordering in the shared archive.
3116 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3117 for (int index = 0; index < length; index++) {
3118 Method* const m = methods->at(index);
3119 assert(!m->valid_vtable_index(), "vtable index should not be set");
3120 m->set_vtable_index(index);
3121 }
3122 }
3123 // Sort method array by ascending method name (for faster lookups & vtable construction)
3124 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3125 Method::sort_methods(methods);
3126
3127 intArray* method_ordering = NULL;
3128 // If JVMTI original method ordering or sharing is enabled construct int
3129 // array remembering the original ordering
3130 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3131 method_ordering = new intArray(length, length, -1);
3132 for (int index = 0; index < length; index++) {
3133 Method* const m = methods->at(index);
3134 const int old_index = m->vtable_index();
3135 assert(old_index >= 0 && old_index < length, "invalid method index");
3136 method_ordering->at_put(index, old_index);
3137 m->set_vtable_index(Method::invalid_vtable_index);
3138 }
3139 }
3140 return method_ordering;
3141 }
3142
3143 // Parse generic_signature attribute for methods and fields
3144 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3145 TRAPS) {
3146 assert(cfs != NULL, "invariant");
3147
3148 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3149 const u2 generic_signature_index = cfs->get_u2_fast();
3150 check_property(
3151 valid_symbol_at(generic_signature_index),
3152 "Invalid Signature attribute at constant pool index %u in class file %s",
3153 generic_signature_index, CHECK_0);
3154 return generic_signature_index;
3155 }
3156
3157 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3158 TRAPS) {
3159
3160 assert(cfs != NULL, "invariant");
3161
3162 cfs->guarantee_more(2, CHECK); // sourcefile_index
3163 const u2 sourcefile_index = cfs->get_u2_fast();
3164 check_property(
3165 valid_symbol_at(sourcefile_index),
3166 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3167 sourcefile_index, CHECK);
3168 set_class_sourcefile_index(sourcefile_index);
3169 }
3170
3171 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3172 int length,
3173 TRAPS) {
3174 assert(cfs != NULL, "invariant");
3175
3176 const u1* const sde_buffer = cfs->current();
3177 assert(sde_buffer != NULL, "null sde buffer");
3178
3179 // Don't bother storing it if there is no way to retrieve it
3180 if (JvmtiExport::can_get_source_debug_extension()) {
3181 assert((length+1) > length, "Overflow checking");
3182 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3183 for (int i = 0; i < length; i++) {
3184 sde[i] = sde_buffer[i];
3185 }
3186 sde[length] = '\0';
3187 set_class_sde_buffer((const char*)sde, length);
3188 }
3189 // Got utf8 string, set stream position forward
3190 cfs->skip_u1(length, CHECK);
3191 }
3192
3193
3194 // Inner classes can be static, private or protected (classic VM does this)
3195 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3196 JVM_ACC_PRIVATE | \
3197 JVM_ACC_PROTECTED | \
3198 JVM_ACC_STATIC \
3199 )
3200
3201 // Return number of classes in the inner classes attribute table
3202 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3203 const u1* const inner_classes_attribute_start,
3204 bool parsed_enclosingmethod_attribute,
3205 u2 enclosing_method_class_index,
3206 u2 enclosing_method_method_index,
3207 TRAPS) {
3208 const u1* const current_mark = cfs->current();
3209 u2 length = 0;
3210 if (inner_classes_attribute_start != NULL) {
3211 cfs->set_current(inner_classes_attribute_start);
3212 cfs->guarantee_more(2, CHECK_0); // length
3213 length = cfs->get_u2_fast();
3214 }
3215
3216 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3217 // method data:
3218 // [inner_class_info_index,
3219 // outer_class_info_index,
3220 // inner_name_index,
3221 // inner_class_access_flags,
3222 // ...
3223 // enclosing_method_class_index,
3224 // enclosing_method_method_index]
3225 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3226 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3227 _inner_classes = inner_classes;
3228
3229 int index = 0;
3230 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3231 for (int n = 0; n < length; n++) {
3232 // Inner class index
3233 const u2 inner_class_info_index = cfs->get_u2_fast();
3234 check_property(
3235 valid_klass_reference_at(inner_class_info_index),
3236 "inner_class_info_index %u has bad constant type in class file %s",
3237 inner_class_info_index, CHECK_0);
3238 // Outer class index
3239 const u2 outer_class_info_index = cfs->get_u2_fast();
3240 check_property(
3241 outer_class_info_index == 0 ||
3242 valid_klass_reference_at(outer_class_info_index),
3243 "outer_class_info_index %u has bad constant type in class file %s",
3244 outer_class_info_index, CHECK_0);
3245 // Inner class name
3246 const u2 inner_name_index = cfs->get_u2_fast();
3247 check_property(
3248 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3249 "inner_name_index %u has bad constant type in class file %s",
3250 inner_name_index, CHECK_0);
3251 if (_need_verify) {
3252 guarantee_property(inner_class_info_index != outer_class_info_index,
3253 "Class is both outer and inner class in class file %s", CHECK_0);
3254 }
3255
3256 jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3257 // JVM_ACC_MODULE is defined in JDK-9 and later.
3258 if (_major_version >= JAVA_9_VERSION) {
3259 recognized_modifiers |= JVM_ACC_MODULE;
3260 }
3261 // JVM_ACC_VALUE is defined for class file version 55 and later
3262 if (supports_value_types()) {
3263 recognized_modifiers |= JVM_ACC_VALUE;
3264 }
3265
3266 // Access flags
3267 jint flags = cfs->get_u2_fast() & recognized_modifiers;
3268
3269 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3270 // Set abstract bit for old class files for backward compatibility
3271 flags |= JVM_ACC_ABSTRACT;
3272 }
3273 verify_legal_class_modifiers(flags, CHECK_0);
3274 AccessFlags inner_access_flags(flags);
3275
3276 inner_classes->at_put(index++, inner_class_info_index);
3277 inner_classes->at_put(index++, outer_class_info_index);
3278 inner_classes->at_put(index++, inner_name_index);
3279 inner_classes->at_put(index++, inner_access_flags.as_short());
3280 }
3281
3282 // 4347400: make sure there's no duplicate entry in the classes array
3283 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3284 for(int i = 0; i < length * 4; i += 4) {
3285 for(int j = i + 4; j < length * 4; j += 4) {
3286 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3287 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3288 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3289 inner_classes->at(i+3) != inner_classes->at(j+3)),
3290 "Duplicate entry in InnerClasses in class file %s",
3291 CHECK_0);
3292 }
3293 }
3294 }
3295
3296 // Set EnclosingMethod class and method indexes.
3297 if (parsed_enclosingmethod_attribute) {
3298 inner_classes->at_put(index++, enclosing_method_class_index);
3299 inner_classes->at_put(index++, enclosing_method_method_index);
3300 }
3301 assert(index == size, "wrong size");
3302
3303 // Restore buffer's current position.
3304 cfs->set_current(current_mark);
3305
3306 return length;
3307 }
3308
3309 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3310 const u1* const nest_members_attribute_start,
3311 TRAPS) {
3312 const u1* const current_mark = cfs->current();
3313 u2 length = 0;
3314 if (nest_members_attribute_start != NULL) {
3315 cfs->set_current(nest_members_attribute_start);
3316 cfs->guarantee_more(2, CHECK_0); // length
3317 length = cfs->get_u2_fast();
3318 }
3319 const int size = length;
3320 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3321 _nest_members = nest_members;
3322
3323 int index = 0;
3324 cfs->guarantee_more(2 * length, CHECK_0);
3325 for (int n = 0; n < length; n++) {
3326 const u2 class_info_index = cfs->get_u2_fast();
3327 check_property(
3328 valid_klass_reference_at(class_info_index),
3329 "Nest member class_info_index %u has bad constant type in class file %s",
3330 class_info_index, CHECK_0);
3331 nest_members->at_put(index++, class_info_index);
3332 }
3333 assert(index == size, "wrong size");
3334
3335 // Restore buffer's current position.
3336 cfs->set_current(current_mark);
3337
3338 return length;
3339 }
3340
3341 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3342 set_class_synthetic_flag(true);
3343 }
3344
3345 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3346 assert(cfs != NULL, "invariant");
3347
3348 const u2 signature_index = cfs->get_u2(CHECK);
3349 check_property(
3350 valid_symbol_at(signature_index),
3351 "Invalid constant pool index %u in Signature attribute in class file %s",
3352 signature_index, CHECK);
3353 set_class_generic_signature_index(signature_index);
3354 }
3355
3356 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3357 ConstantPool* cp,
3358 u4 attribute_byte_length,
3359 TRAPS) {
3360 assert(cfs != NULL, "invariant");
3361 assert(cp != NULL, "invariant");
3362
3363 const u1* const current_start = cfs->current();
3364
3365 guarantee_property(attribute_byte_length >= sizeof(u2),
3366 "Invalid BootstrapMethods attribute length %u in class file %s",
3367 attribute_byte_length,
3368 CHECK);
3369
3370 cfs->guarantee_more(attribute_byte_length, CHECK);
3371
3372 const int attribute_array_length = cfs->get_u2_fast();
3373
3374 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3375 "Short length on BootstrapMethods in class file %s",
3376 CHECK);
3377
3378
3379 // The attribute contains a counted array of counted tuples of shorts,
3380 // represending bootstrap specifiers:
3381 // length*{bootstrap_method_index, argument_count*{argument_index}}
3382 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3383 // operand_count = number of shorts in attr, except for leading length
3384
3385 // The attribute is copied into a short[] array.
3386 // The array begins with a series of short[2] pairs, one for each tuple.
3387 const int index_size = (attribute_array_length * 2);
3388
3389 Array<u2>* const operands =
3390 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3391
3392 // Eagerly assign operands so they will be deallocated with the constant
3393 // pool if there is an error.
3394 cp->set_operands(operands);
3395
3396 int operand_fill_index = index_size;
3397 const int cp_size = cp->length();
3398
3399 for (int n = 0; n < attribute_array_length; n++) {
3400 // Store a 32-bit offset into the header of the operand array.
3401 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3402
3403 // Read a bootstrap specifier.
3404 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3405 const u2 bootstrap_method_index = cfs->get_u2_fast();
3406 const u2 argument_count = cfs->get_u2_fast();
3407 check_property(
3408 valid_cp_range(bootstrap_method_index, cp_size) &&
3409 cp->tag_at(bootstrap_method_index).is_method_handle(),
3410 "bootstrap_method_index %u has bad constant type in class file %s",
3411 bootstrap_method_index,
3412 CHECK);
3413
3414 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3415 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3416 CHECK);
3417
3418 operands->at_put(operand_fill_index++, bootstrap_method_index);
3419 operands->at_put(operand_fill_index++, argument_count);
3420
3421 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3422 for (int j = 0; j < argument_count; j++) {
3423 const u2 argument_index = cfs->get_u2_fast();
3424 check_property(
3425 valid_cp_range(argument_index, cp_size) &&
3426 cp->tag_at(argument_index).is_loadable_constant(),
3427 "argument_index %u has bad constant type in class file %s",
3428 argument_index,
3429 CHECK);
3430 operands->at_put(operand_fill_index++, argument_index);
3431 }
3432 }
3433 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3434 "Bad length on BootstrapMethods in class file %s",
3435 CHECK);
3436 }
3437
3438 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3439 ConstantPool* cp,
3440 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3441 TRAPS) {
3442 assert(cfs != NULL, "invariant");
3443 assert(cp != NULL, "invariant");
3444 assert(parsed_annotations != NULL, "invariant");
3445
3446 // Set inner classes attribute to default sentinel
3447 _inner_classes = Universe::the_empty_short_array();
3448 // Set nest members attribute to default sentinel
3449 _nest_members = Universe::the_empty_short_array();
3450 cfs->guarantee_more(2, CHECK); // attributes_count
3451 u2 attributes_count = cfs->get_u2_fast();
3452 bool parsed_sourcefile_attribute = false;
3453 bool parsed_innerclasses_attribute = false;
3454 bool parsed_nest_members_attribute = false;
3455 bool parsed_nest_host_attribute = false;
3456 bool parsed_enclosingmethod_attribute = false;
3457 bool parsed_bootstrap_methods_attribute = false;
3458 const u1* runtime_visible_annotations = NULL;
3459 int runtime_visible_annotations_length = 0;
3460 const u1* runtime_invisible_annotations = NULL;
3461 int runtime_invisible_annotations_length = 0;
3462 const u1* runtime_visible_type_annotations = NULL;
3463 int runtime_visible_type_annotations_length = 0;
3464 const u1* runtime_invisible_type_annotations = NULL;
3465 int runtime_invisible_type_annotations_length = 0;
3466 bool runtime_invisible_type_annotations_exists = false;
3467 bool runtime_invisible_annotations_exists = false;
3468 bool parsed_source_debug_ext_annotations_exist = false;
3469 const u1* inner_classes_attribute_start = NULL;
3470 u4 inner_classes_attribute_length = 0;
3471 const u1* value_types_attribute_start = NULL;
3472 u4 value_types_attribute_length = 0;
3473 u2 enclosing_method_class_index = 0;
3474 u2 enclosing_method_method_index = 0;
3475 const u1* nest_members_attribute_start = NULL;
3476 u4 nest_members_attribute_length = 0;
3477
3478 // Iterate over attributes
3479 while (attributes_count--) {
3480 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3481 const u2 attribute_name_index = cfs->get_u2_fast();
3482 const u4 attribute_length = cfs->get_u4_fast();
3483 check_property(
3484 valid_symbol_at(attribute_name_index),
3485 "Attribute name has bad constant pool index %u in class file %s",
3486 attribute_name_index, CHECK);
3487 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3488 if (tag == vmSymbols::tag_source_file()) {
3489 // Check for SourceFile tag
3490 if (_need_verify) {
3491 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3492 }
3493 if (parsed_sourcefile_attribute) {
3494 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3495 } else {
3496 parsed_sourcefile_attribute = true;
3497 }
3498 parse_classfile_sourcefile_attribute(cfs, CHECK);
3499 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3500 // Check for SourceDebugExtension tag
3501 if (parsed_source_debug_ext_annotations_exist) {
3502 classfile_parse_error(
3503 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3504 }
3505 parsed_source_debug_ext_annotations_exist = true;
3506 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3507 } else if (tag == vmSymbols::tag_inner_classes()) {
3508 // Check for InnerClasses tag
3509 if (parsed_innerclasses_attribute) {
3510 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3511 } else {
3512 parsed_innerclasses_attribute = true;
3513 }
3514 inner_classes_attribute_start = cfs->current();
3515 inner_classes_attribute_length = attribute_length;
3516 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3517 } else if (tag == vmSymbols::tag_synthetic()) {
3518 // Check for Synthetic tag
3519 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3520 if (attribute_length != 0) {
3521 classfile_parse_error(
3522 "Invalid Synthetic classfile attribute length %u in class file %s",
3523 attribute_length, CHECK);
3524 }
3525 parse_classfile_synthetic_attribute(CHECK);
3526 } else if (tag == vmSymbols::tag_deprecated()) {
3527 // Check for Deprecatd tag - 4276120
3528 if (attribute_length != 0) {
3529 classfile_parse_error(
3530 "Invalid Deprecated classfile attribute length %u in class file %s",
3531 attribute_length, CHECK);
3532 }
3533 } else if (_major_version >= JAVA_1_5_VERSION) {
3534 if (tag == vmSymbols::tag_signature()) {
3535 if (_generic_signature_index != 0) {
3536 classfile_parse_error(
3537 "Multiple Signature attributes in class file %s", CHECK);
3538 }
3539 if (attribute_length != 2) {
3540 classfile_parse_error(
3541 "Wrong Signature attribute length %u in class file %s",
3542 attribute_length, CHECK);
3543 }
3544 parse_classfile_signature_attribute(cfs, CHECK);
3545 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3546 if (runtime_visible_annotations != NULL) {
3547 classfile_parse_error(
3548 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3549 }
3550 runtime_visible_annotations_length = attribute_length;
3551 runtime_visible_annotations = cfs->current();
3552 assert(runtime_visible_annotations != NULL, "null visible annotations");
3553 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3554 parse_annotations(cp,
3555 runtime_visible_annotations,
3556 runtime_visible_annotations_length,
3557 parsed_annotations,
3558 _loader_data,
3559 CHECK);
3560 cfs->skip_u1_fast(runtime_visible_annotations_length);
3561 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3562 if (runtime_invisible_annotations_exists) {
3563 classfile_parse_error(
3564 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3565 }
3566 runtime_invisible_annotations_exists = true;
3567 if (PreserveAllAnnotations) {
3568 runtime_invisible_annotations_length = attribute_length;
3569 runtime_invisible_annotations = cfs->current();
3570 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3571 }
3572 cfs->skip_u1(attribute_length, CHECK);
3573 } else if (tag == vmSymbols::tag_enclosing_method()) {
3574 if (parsed_enclosingmethod_attribute) {
3575 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3576 } else {
3577 parsed_enclosingmethod_attribute = true;
3578 }
3579 guarantee_property(attribute_length == 4,
3580 "Wrong EnclosingMethod attribute length %u in class file %s",
3581 attribute_length, CHECK);
3582 cfs->guarantee_more(4, CHECK); // class_index, method_index
3583 enclosing_method_class_index = cfs->get_u2_fast();
3584 enclosing_method_method_index = cfs->get_u2_fast();
3585 if (enclosing_method_class_index == 0) {
3586 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3587 }
3588 // Validate the constant pool indices and types
3589 check_property(valid_klass_reference_at(enclosing_method_class_index),
3590 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3591 if (enclosing_method_method_index != 0 &&
3592 (!cp->is_within_bounds(enclosing_method_method_index) ||
3593 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3594 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3595 }
3596 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3597 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3598 if (parsed_bootstrap_methods_attribute) {
3599 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3600 }
3601 parsed_bootstrap_methods_attribute = true;
3602 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3603 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3604 if (runtime_visible_type_annotations != NULL) {
3605 classfile_parse_error(
3606 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3607 }
3608 runtime_visible_type_annotations_length = attribute_length;
3609 runtime_visible_type_annotations = cfs->current();
3610 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3611 // No need for the VM to parse Type annotations
3612 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3613 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3614 if (runtime_invisible_type_annotations_exists) {
3615 classfile_parse_error(
3616 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3617 } else {
3618 runtime_invisible_type_annotations_exists = true;
3619 }
3620 if (PreserveAllAnnotations) {
3621 runtime_invisible_type_annotations_length = attribute_length;
3622 runtime_invisible_type_annotations = cfs->current();
3623 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3624 }
3625 cfs->skip_u1(attribute_length, CHECK);
3626 } else if (_major_version >= JAVA_11_VERSION) {
3627 if (tag == vmSymbols::tag_nest_members()) {
3628 // Check for NestMembers tag
3629 if (parsed_nest_members_attribute) {
3630 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK);
3631 } else {
3632 parsed_nest_members_attribute = true;
3633 }
3634 if (parsed_nest_host_attribute) {
3635 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK);
3636 }
3637 nest_members_attribute_start = cfs->current();
3638 nest_members_attribute_length = attribute_length;
3639 cfs->skip_u1(nest_members_attribute_length, CHECK);
3640 } else if (tag == vmSymbols::tag_nest_host()) {
3641 if (parsed_nest_host_attribute) {
3642 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK);
3643 } else {
3644 parsed_nest_host_attribute = true;
3645 }
3646 if (parsed_nest_members_attribute) {
3647 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK);
3648 }
3649 if (_need_verify) {
3650 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3651 }
3652 cfs->guarantee_more(2, CHECK);
3653 u2 class_info_index = cfs->get_u2_fast();
3654 check_property(
3655 valid_klass_reference_at(class_info_index),
3656 "Nest-host class_info_index %u has bad constant type in class file %s",
3657 class_info_index, CHECK);
3658 _nest_host = class_info_index;
3659 } else {
3660 // Unknown attribute
3661 cfs->skip_u1(attribute_length, CHECK);
3662 }
3663 } else {
3664 // Unknown attribute
3665 cfs->skip_u1(attribute_length, CHECK);
3666 }
3667 } else {
3668 // Unknown attribute
3669 cfs->skip_u1(attribute_length, CHECK);
3670 }
3671 }
3672 _annotations = assemble_annotations(runtime_visible_annotations,
3673 runtime_visible_annotations_length,
3674 runtime_invisible_annotations,
3675 runtime_invisible_annotations_length,
3676 CHECK);
3677 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3678 runtime_visible_type_annotations_length,
3679 runtime_invisible_type_annotations,
3680 runtime_invisible_type_annotations_length,
3681 CHECK);
3682
3683 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3684 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3685 cfs,
3686 inner_classes_attribute_start,
3687 parsed_innerclasses_attribute,
3688 enclosing_method_class_index,
3689 enclosing_method_method_index,
3690 CHECK);
3691 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3692 guarantee_property(
3693 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3694 "Wrong InnerClasses attribute length in class file %s", CHECK);
3695 }
3696 }
3697
3698 if (parsed_nest_members_attribute) {
3699 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3700 cfs,
3701 nest_members_attribute_start,
3702 CHECK);
3703 if (_need_verify) {
3704 guarantee_property(
3705 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3706 "Wrong NestMembers attribute length in class file %s", CHECK);
3707 }
3708 }
3709
3710 if (_max_bootstrap_specifier_index >= 0) {
3711 guarantee_property(parsed_bootstrap_methods_attribute,
3712 "Missing BootstrapMethods attribute in class file %s", CHECK);
3713 }
3714 }
3715
3716 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3717 assert(k != NULL, "invariant");
3718
3719 if (_synthetic_flag)
3720 k->set_is_synthetic();
3721 if (_sourcefile_index != 0) {
3722 k->set_source_file_name_index(_sourcefile_index);
3723 }
3724 if (_generic_signature_index != 0) {
3725 k->set_generic_signature_index(_generic_signature_index);
3726 }
3727 if (_sde_buffer != NULL) {
3728 k->set_source_debug_extension(_sde_buffer, _sde_length);
3729 }
3730 }
3731
3732 // Create the Annotations object that will
3733 // hold the annotations array for the Klass.
3734 void ClassFileParser::create_combined_annotations(TRAPS) {
3735 if (_annotations == NULL &&
3736 _type_annotations == NULL &&
3737 _fields_annotations == NULL &&
3738 _fields_type_annotations == NULL) {
3739 // Don't create the Annotations object unnecessarily.
3740 return;
3741 }
3742
3743 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3744 annotations->set_class_annotations(_annotations);
3745 annotations->set_class_type_annotations(_type_annotations);
3746 annotations->set_fields_annotations(_fields_annotations);
3747 annotations->set_fields_type_annotations(_fields_type_annotations);
3748
3749 // This is the Annotations object that will be
3750 // assigned to InstanceKlass being constructed.
3751 _combined_annotations = annotations;
3752
3753 // The annotations arrays below has been transfered the
3754 // _combined_annotations so these fields can now be cleared.
3755 _annotations = NULL;
3756 _type_annotations = NULL;
3757 _fields_annotations = NULL;
3758 _fields_type_annotations = NULL;
3759 }
3760
3761 // Transfer ownership of metadata allocated to the InstanceKlass.
3762 void ClassFileParser::apply_parsed_class_metadata(
3763 InstanceKlass* this_klass,
3764 int java_fields_count, TRAPS) {
3765 assert(this_klass != NULL, "invariant");
3766
3767 _cp->set_pool_holder(this_klass);
3768 this_klass->set_constants(_cp);
3769 this_klass->set_fields(_fields, java_fields_count);
3770 this_klass->set_methods(_methods);
3771 this_klass->set_inner_classes(_inner_classes);
3772 this_klass->set_nest_members(_nest_members);
3773 this_klass->set_nest_host_index(_nest_host);
3774 this_klass->set_local_interfaces(_local_interfaces);
3775 this_klass->set_annotations(_combined_annotations);
3776 // Delay the setting of _transitive_interfaces until after initialize_supers() in
3777 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with
3778 // its _super. If an OOM occurs while loading the current klass, its _super field
3779 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3780 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3781 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3782
3783 // Clear out these fields so they don't get deallocated by the destructor
3784 clear_class_metadata();
3785 }
3786
3787 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3788 int runtime_visible_annotations_length,
3789 const u1* const runtime_invisible_annotations,
3790 int runtime_invisible_annotations_length,
3791 TRAPS) {
3792 AnnotationArray* annotations = NULL;
3793 if (runtime_visible_annotations != NULL ||
3794 runtime_invisible_annotations != NULL) {
3795 annotations = MetadataFactory::new_array<u1>(_loader_data,
3796 runtime_visible_annotations_length +
3797 runtime_invisible_annotations_length,
3798 CHECK_(annotations));
3799 if (runtime_visible_annotations != NULL) {
3800 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3801 annotations->at_put(i, runtime_visible_annotations[i]);
3802 }
3803 }
3804 if (runtime_invisible_annotations != NULL) {
3805 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3806 int append = runtime_visible_annotations_length+i;
3807 annotations->at_put(append, runtime_invisible_annotations[i]);
3808 }
3809 }
3810 }
3811 return annotations;
3812 }
3813
3814 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3815 const int super_class_index,
3816 const bool need_verify,
3817 TRAPS) {
3818 assert(cp != NULL, "invariant");
3819 const InstanceKlass* super_klass = NULL;
3820
3821 if (super_class_index == 0) {
3822 check_property(_class_name == vmSymbols::java_lang_Object()
3823 || (_access_flags.get_flags() & JVM_ACC_VALUE),
3824 "Invalid superclass index %u in class file %s",
3825 super_class_index,
3826 CHECK_NULL);
3827 } else {
3828 check_property(valid_klass_reference_at(super_class_index),
3829 "Invalid superclass index %u in class file %s",
3830 super_class_index,
3831 CHECK_NULL);
3832 // The class name should be legal because it is checked when parsing constant pool.
3833 // However, make sure it is not an array type.
3834 bool is_array = false;
3835 if (cp->tag_at(super_class_index).is_klass()) {
3836 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3837 if (need_verify)
3838 is_array = super_klass->is_array_klass();
3839 } else if (need_verify) {
3840 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3841 }
3842 if (need_verify) {
3843 guarantee_property(!is_array,
3844 "Bad superclass name in class file %s", CHECK_NULL);
3845 }
3846 }
3847 return super_klass;
3848 }
3849
3850 #ifndef PRODUCT
3851 static void print_field_layout(const Symbol* name,
3852 Array<u2>* fields,
3853 const constantPoolHandle& cp,
3854 int instance_size,
3855 int instance_fields_start,
3856 int instance_fields_end,
3857 int static_fields_end) {
3858
3859 assert(name != NULL, "invariant");
3860
3861 tty->print("%s: field layout\n", name->as_klass_external_name());
3862 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3863 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3864 if (!fs.access_flags().is_static()) {
3865 tty->print(" @%3d \"%s\" %s\n",
3866 fs.offset(),
3867 fs.name()->as_klass_external_name(),
3868 fs.signature()->as_klass_external_name());
3869 }
3870 }
3871 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3872 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3873 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3874 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3875 if (fs.access_flags().is_static()) {
3876 tty->print(" @%3d \"%s\" %s\n",
3877 fs.offset(),
3878 fs.name()->as_klass_external_name(),
3879 fs.signature()->as_klass_external_name());
3880 }
3881 }
3882 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3883 tty->print("\n");
3884 }
3885 #endif
3886
3887 // Values needed for oopmap and InstanceKlass creation
3888 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3889 public:
3890 OopMapBlocksBuilder* oop_map_blocks;
3891 int instance_size;
3892 int nonstatic_field_size;
3893 int static_field_size;
3894 bool has_nonstatic_fields;
3895 };
3896
3897 // Utility to collect and compact oop maps during layout
3898 class ClassFileParser::OopMapBlocksBuilder : public ResourceObj {
3899 public:
3900 OopMapBlock* nonstatic_oop_maps;
3901 unsigned int nonstatic_oop_map_count;
3902 unsigned int max_nonstatic_oop_maps;
3903
3904 public:
3905 OopMapBlocksBuilder(unsigned int max_blocks, TRAPS) {
3906 max_nonstatic_oop_maps = max_blocks;
3907 nonstatic_oop_map_count = 0;
3908 if (max_blocks == 0) {
3909 nonstatic_oop_maps = NULL;
3910 } else {
3911 nonstatic_oop_maps = NEW_RESOURCE_ARRAY_IN_THREAD(
3912 THREAD, OopMapBlock, max_nonstatic_oop_maps);
3913 memset(nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3914 }
3915 }
3916
3917 OopMapBlock* last_oop_map() const {
3918 assert(nonstatic_oop_map_count > 0, "Has no oop maps");
3919 return nonstatic_oop_maps + (nonstatic_oop_map_count - 1);
3920 }
3921
3922 // addition of super oop maps
3923 void initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3924 assert(nof_blocks && nonstatic_oop_map_count == 0 &&
3925 nof_blocks <= max_nonstatic_oop_maps, "invariant");
3926
3927 memcpy(nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3928 nonstatic_oop_map_count += nof_blocks;
3929 }
3930
3931 // collection of oops
3932 void add(int offset, int count) {
3933 if (nonstatic_oop_map_count == 0) {
3934 nonstatic_oop_map_count++;
3935 }
3936 OopMapBlock* nonstatic_oop_map = last_oop_map();
3937 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
3938 nonstatic_oop_map->set_offset(offset);
3939 nonstatic_oop_map->set_count(count);
3940 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
3941 nonstatic_oop_map->increment_count(count);
3942 } else { // Need a new one...
3943 nonstatic_oop_map_count++;
3944 assert(nonstatic_oop_map_count <= max_nonstatic_oop_maps, "range check");
3945 nonstatic_oop_map = last_oop_map();
3946 nonstatic_oop_map->set_offset(offset);
3947 nonstatic_oop_map->set_count(count);
3948 }
3949 }
3950
3951 // general purpose copy, e.g. into allocated instanceKlass
3952 void copy(OopMapBlock* dst) {
3953 if (nonstatic_oop_map_count != 0) {
3954 memcpy(dst, nonstatic_oop_maps, sizeof(OopMapBlock) * nonstatic_oop_map_count);
3955 }
3956 }
3957
3958 // Sort and compact adjacent blocks
3959 void compact(TRAPS) {
3960 if (nonstatic_oop_map_count <= 1) {
3961 return;
3962 }
3963 /*
3964 * Since field layout sneeks in oops before values, we will be able to condense
3965 * blocks. There is potential to compact between super, own refs and values
3966 * containing refs.
3967 *
3968 * Currently compaction is slightly limited due to values being 8 byte aligned.
3969 * This may well change: FixMe if doesn't, the code below is fairly general purpose
3970 * and maybe it doesn't need to be.
3971 */
3972 qsort(nonstatic_oop_maps, nonstatic_oop_map_count, sizeof(OopMapBlock),
3973 (_sort_Fn)OopMapBlock::compare_offset);
3974 if (nonstatic_oop_map_count < 2) {
3975 return;
3976 }
3977
3978 //Make a temp copy, and iterate through and copy back into the orig
3979 ResourceMark rm(THREAD);
3980 OopMapBlock* oop_maps_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, OopMapBlock,
3981 nonstatic_oop_map_count);
3982 OopMapBlock* oop_maps_copy_end = oop_maps_copy + nonstatic_oop_map_count;
3983 copy(oop_maps_copy);
3984 OopMapBlock* nonstatic_oop_map = nonstatic_oop_maps;
3985 unsigned int new_count = 1;
3986 oop_maps_copy++;
3987 while(oop_maps_copy < oop_maps_copy_end) {
3988 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
3989 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
3990 nonstatic_oop_map->increment_count(oop_maps_copy->count());
3991 } else {
3992 nonstatic_oop_map++;
3993 new_count++;
3994 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
3995 nonstatic_oop_map->set_count(oop_maps_copy->count());
3996 }
3997 oop_maps_copy++;
3998 }
3999 assert(new_count <= nonstatic_oop_map_count, "end up with more maps after compact() ?");
4000 nonstatic_oop_map_count = new_count;
4001 }
4002
4003 void print_on(outputStream* st) const {
4004 st->print_cr(" OopMapBlocks: %3d /%3d", nonstatic_oop_map_count, max_nonstatic_oop_maps);
4005 if (nonstatic_oop_map_count > 0) {
4006 OopMapBlock* map = nonstatic_oop_maps;
4007 OopMapBlock* last_map = last_oop_map();
4008 assert(map <= last_map, "Last less than first");
4009 while (map <= last_map) {
4010 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4011 map->offset() + map->offset_span() - heapOopSize, map->count());
4012 map++;
4013 }
4014 }
4015 }
4016
4017 void print_value_on(outputStream* st) const {
4018 print_on(st);
4019 }
4020
4021 };
4022
4023 void ClassFileParser::throwValueTypeLimitation(THREAD_AND_LOCATION_DECL,
4024 const char* msg,
4025 const Symbol* name,
4026 const Symbol* sig) const {
4027
4028 ResourceMark rm(THREAD);
4029 if (name == NULL || sig == NULL) {
4030 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
4031 vmSymbols::java_lang_ClassFormatError(),
4032 "class: %s - %s", _class_name->as_C_string(), msg);
4033 }
4034 else {
4035 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
4036 vmSymbols::java_lang_ClassFormatError(),
4037 "\"%s\" sig: \"%s\" class: %s - %s", name->as_C_string(), sig->as_C_string(),
4038 _class_name->as_C_string(), msg);
4039 }
4040 }
4041
4042 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
4043 void ClassFileParser::layout_fields(ConstantPool* cp,
4044 const FieldAllocationCount* fac,
4045 const ClassAnnotationCollector* parsed_annotations,
4046 FieldLayoutInfo* info,
4047 TRAPS) {
4048
4049 assert(cp != NULL, "invariant");
4050
4051 // Field size and offset computation
4052 int nonstatic_field_size = _super_klass == NULL ? 0 :
4053 _super_klass->nonstatic_field_size();
4054 int next_nonstatic_valuetype_offset = 0;
4055 int first_nonstatic_valuetype_offset = 0;
4056
4057 // Fields that are value types are handled differently depending if they are static or not:
4058 // - static fields are oops
4059 // - non-static fields are embedded
4060
4061 // Count the contended fields by type.
4062 //
4063 // We ignore static fields, because @Contended is not supported for them.
4064 // The layout code below will also ignore the static fields.
4065 int nonstatic_contended_count = 0;
4066 FieldAllocationCount fac_contended;
4067 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4068 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4069 if (fs.is_contended()) {
4070 fac_contended.count[atype]++;
4071 if (!fs.access_flags().is_static()) {
4072 nonstatic_contended_count++;
4073 }
4074 }
4075 }
4076
4077
4078 // Calculate the starting byte offsets
4079 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
4080 // Value types in static fields are not embedded, they are handled with oops
4081 int next_static_double_offset = next_static_oop_offset +
4082 ((fac->count[STATIC_OOP] + fac->count[STATIC_FLATTENABLE]) * heapOopSize);
4083 if (fac->count[STATIC_DOUBLE]) {
4084 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
4085 }
4086
4087 int next_static_word_offset = next_static_double_offset +
4088 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
4089 int next_static_short_offset = next_static_word_offset +
4090 ((fac->count[STATIC_WORD]) * BytesPerInt);
4091 int next_static_byte_offset = next_static_short_offset +
4092 ((fac->count[STATIC_SHORT]) * BytesPerShort);
4093
4094 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
4095 nonstatic_field_size * heapOopSize;
4096
4097 // First field of value types is aligned on a long boundary in order to ease
4098 // in-lining of value types (with header removal) in packed arrays and
4099 // flatten value types
4100 int initial_value_type_padding = 0;
4101 if (is_value_type()) {
4102 int old = nonstatic_fields_start;
4103 nonstatic_fields_start = align_up(nonstatic_fields_start, BytesPerLong);
4104 initial_value_type_padding = nonstatic_fields_start - old;
4105 }
4106
4107 int next_nonstatic_field_offset = nonstatic_fields_start;
4108
4109 const bool is_contended_class = parsed_annotations->is_contended();
4110
4111 // Class is contended, pad before all the fields
4112 if (is_contended_class) {
4113 next_nonstatic_field_offset += ContendedPaddingWidth;
4114 }
4115
4116 // Temporary value types restrictions
4117 if (is_value_type()) {
4118 if (is_contended_class) {
4119 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support @Contended annotation yet");
4120 return;
4121 }
4122 }
4123
4124 // Compute the non-contended fields count.
4125 // The packing code below relies on these counts to determine if some field
4126 // can be squeezed into the alignment gap. Contended fields are obviously
4127 // exempt from that.
4128 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
4129 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
4130 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
4131 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
4132 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
4133
4134 int static_value_type_count = 0;
4135 int nonstatic_value_type_count = 0;
4136 int* nonstatic_value_type_indexes = NULL;
4137 Klass** nonstatic_value_type_klasses = NULL;
4138 unsigned int value_type_oop_map_count = 0;
4139 int not_flattened_value_types = 0;
4140
4141 int max_nonstatic_value_type = fac->count[NONSTATIC_FLATTENABLE] + 1;
4142
4143 nonstatic_value_type_indexes = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, int,
4144 max_nonstatic_value_type);
4145 for (int i = 0; i < max_nonstatic_value_type; i++) {
4146 nonstatic_value_type_indexes[i] = -1;
4147 }
4148 nonstatic_value_type_klasses = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, Klass*,
4149 max_nonstatic_value_type);
4150
4151 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
4152 if (fs.allocation_type() == STATIC_FLATTENABLE) {
4153 // Pre-resolve the flattenable field and check for value type circularity
4154 // issues. Note that super-class circularity checks are not needed here
4155 // because flattenable fields can only be in value types and value types
4156 // only have java.lang.Object as their super class.
4157 // Also, note that super-interface circularity checks are not needed
4158 // because interfaces cannot be value types.
4159 ResourceMark rm;
4160 if (!fs.signature()->is_Q_signature()) {
4161 THROW(vmSymbols::java_lang_ClassFormatError());
4162 }
4163 Klass* klass =
4164 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4165 Handle(THREAD, _loader_data->class_loader()),
4166 _protection_domain, true, CHECK);
4167 assert(klass != NULL, "Sanity check");
4168 if (!klass->access_flags().is_value_type()) {
4169 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4170 }
4171 static_value_type_count++;
4172 } else if (fs.allocation_type() == NONSTATIC_FLATTENABLE) {
4173 // Pre-resolve the flattenable field and check for value type circularity issues.
4174 ResourceMark rm;
4175 if (!fs.signature()->is_Q_signature()) {
4176 THROW(vmSymbols::java_lang_ClassFormatError());
4177 }
4178 Klass* klass =
4179 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4180 Handle(THREAD, _loader_data->class_loader()),
4181 _protection_domain, true, CHECK);
4182 assert(klass != NULL, "Sanity check");
4183 if (!klass->access_flags().is_value_type()) {
4184 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4185 }
4186 ValueKlass* vk = ValueKlass::cast(klass);
4187 // Conditions to apply flattening or not should be defined in a single place
4188 if ((ValueFieldMaxFlatSize < 0) || (vk->size_helper() * HeapWordSize) <= ValueFieldMaxFlatSize) {
4189 nonstatic_value_type_indexes[nonstatic_value_type_count] = fs.index();
4190 nonstatic_value_type_klasses[nonstatic_value_type_count] = klass;
4191 nonstatic_value_type_count++;
4192
4193 ValueKlass* vklass = ValueKlass::cast(klass);
4194 if (vklass->contains_oops()) {
4195 value_type_oop_map_count += vklass->nonstatic_oop_map_count();
4196 }
4197 fs.set_flattened(true);
4198 } else {
4199 not_flattened_value_types++;
4200 fs.set_flattened(false);
4201 }
4202 }
4203 }
4204
4205 // Adjusting non_static_oop_count to take into account not flattened value types;
4206 nonstatic_oop_count += not_flattened_value_types;
4207
4208 // Total non-static fields count, including every contended field
4209 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
4210 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
4211 fac->count[NONSTATIC_OOP] + fac->count[NONSTATIC_FLATTENABLE];
4212
4213 const bool super_has_nonstatic_fields =
4214 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
4215 const bool has_nonstatic_fields =
4216 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
4217 const bool has_nonstatic_value_fields = nonstatic_value_type_count > 0;
4218
4219 if (is_value_type() && (!has_nonstatic_fields)) {
4220 // There are a number of fixes required throughout the type system and JIT
4221 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support zero instance size yet");
4222 return;
4223 }
4224
4225 // Prepare list of oops for oop map generation.
4226 //
4227 // "offset" and "count" lists are describing the set of contiguous oop
4228 // regions. offset[i] is the start of the i-th region, which then has
4229 // count[i] oops following. Before we know how many regions are required,
4230 // we pessimistically allocate the maps to fit all the oops into the
4231 // distinct regions.
4232 //
4233 int super_oop_map_count = (_super_klass == NULL) ? 0 :_super_klass->nonstatic_oop_map_count();
4234 int max_oop_map_count =
4235 super_oop_map_count +
4236 fac->count[NONSTATIC_OOP] +
4237 value_type_oop_map_count +
4238 not_flattened_value_types;
4239
4240 OopMapBlocksBuilder* nonstatic_oop_maps = new OopMapBlocksBuilder(max_oop_map_count, THREAD);
4241 if (super_oop_map_count > 0) {
4242 nonstatic_oop_maps->initialize_inherited_blocks(_super_klass->start_of_nonstatic_oop_maps(),
4243 _super_klass->nonstatic_oop_map_count());
4244 }
4245
4246 int first_nonstatic_oop_offset = 0; // will be set for first oop field
4247
4248 bool compact_fields = CompactFields;
4249 int allocation_style = FieldsAllocationStyle;
4250 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
4251 assert(false, "0 <= FieldsAllocationStyle <= 2");
4252 allocation_style = 1; // Optimistic
4253 }
4254
4255 // The next classes have predefined hard-coded fields offsets
4256 // (see in JavaClasses::compute_hard_coded_offsets()).
4257 // Use default fields allocation order for them.
4258 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
4259 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
4260 _class_name == vmSymbols::java_lang_Class() ||
4261 _class_name == vmSymbols::java_lang_ClassLoader() ||
4262 _class_name == vmSymbols::java_lang_ref_Reference() ||
4263 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
4264 _class_name == vmSymbols::java_lang_StackTraceElement() ||
4265 _class_name == vmSymbols::java_lang_String() ||
4266 _class_name == vmSymbols::java_lang_Throwable() ||
4267 _class_name == vmSymbols::java_lang_Boolean() ||
4268 _class_name == vmSymbols::java_lang_Character() ||
4269 _class_name == vmSymbols::java_lang_Float() ||
4270 _class_name == vmSymbols::java_lang_Double() ||
4271 _class_name == vmSymbols::java_lang_Byte() ||
4272 _class_name == vmSymbols::java_lang_Short() ||
4273 _class_name == vmSymbols::java_lang_Integer() ||
4274 _class_name == vmSymbols::java_lang_Long())) {
4275 allocation_style = 0; // Allocate oops first
4276 compact_fields = false; // Don't compact fields
4277 }
4278
4279 int next_nonstatic_oop_offset = 0;
4280 int next_nonstatic_double_offset = 0;
4281
4282 // Rearrange fields for a given allocation style
4283 if( allocation_style == 0 ) {
4284 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
4285 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4286 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4287 (nonstatic_oop_count * heapOopSize);
4288 } else if( allocation_style == 1 ) {
4289 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
4290 next_nonstatic_double_offset = next_nonstatic_field_offset;
4291 } else if( allocation_style == 2 ) {
4292 // Fields allocation: oops fields in super and sub classes are together.
4293 if( nonstatic_field_size > 0 && super_oop_map_count > 0 ) {
4294 if (next_nonstatic_field_offset == nonstatic_oop_maps->last_oop_map()->end_offset()) {
4295 allocation_style = 0; // allocate oops first
4296 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4297 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4298 (nonstatic_oop_count * heapOopSize);
4299 }
4300 }
4301 if( allocation_style == 2 ) {
4302 allocation_style = 1; // allocate oops last
4303 next_nonstatic_double_offset = next_nonstatic_field_offset;
4304 }
4305 } else {
4306 ShouldNotReachHere();
4307 }
4308
4309 int nonstatic_oop_space_count = 0;
4310 int nonstatic_word_space_count = 0;
4311 int nonstatic_short_space_count = 0;
4312 int nonstatic_byte_space_count = 0;
4313 int nonstatic_oop_space_offset = 0;
4314 int nonstatic_word_space_offset = 0;
4315 int nonstatic_short_space_offset = 0;
4316 int nonstatic_byte_space_offset = 0;
4317
4318 // Try to squeeze some of the fields into the gaps due to
4319 // long/double alignment.
4320 if (nonstatic_double_count > 0) {
4321 int offset = next_nonstatic_double_offset;
4322 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
4323 if (compact_fields && offset != next_nonstatic_double_offset) {
4324 // Allocate available fields into the gap before double field.
4325 int length = next_nonstatic_double_offset - offset;
4326 assert(length == BytesPerInt, "");
4327 nonstatic_word_space_offset = offset;
4328 if (nonstatic_word_count > 0) {
4329 nonstatic_word_count -= 1;
4330 nonstatic_word_space_count = 1; // Only one will fit
4331 length -= BytesPerInt;
4332 offset += BytesPerInt;
4333 }
4334 nonstatic_short_space_offset = offset;
4335 while (length >= BytesPerShort && nonstatic_short_count > 0) {
4336 nonstatic_short_count -= 1;
4337 nonstatic_short_space_count += 1;
4338 length -= BytesPerShort;
4339 offset += BytesPerShort;
4340 }
4341 nonstatic_byte_space_offset = offset;
4342 while (length > 0 && nonstatic_byte_count > 0) {
4343 nonstatic_byte_count -= 1;
4344 nonstatic_byte_space_count += 1;
4345 length -= 1;
4346 }
4347 // Allocate oop field in the gap if there are no other fields for that.
4348 nonstatic_oop_space_offset = offset;
4349 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
4350 allocation_style != 0) { // when oop fields not first
4351 nonstatic_oop_count -= 1;
4352 nonstatic_oop_space_count = 1; // Only one will fit
4353 length -= heapOopSize;
4354 offset += heapOopSize;
4355 }
4356 }
4357 }
4358
4359 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4360 (nonstatic_double_count * BytesPerLong);
4361 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4362 (nonstatic_word_count * BytesPerInt);
4363 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4364 (nonstatic_short_count * BytesPerShort);
4365 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4366 nonstatic_byte_count;
4367
4368 // let oops jump before padding with this allocation style
4369 if( allocation_style == 1 ) {
4370 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4371 if( nonstatic_oop_count > 0 ) {
4372 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4373 }
4374 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4375 }
4376
4377 // Aligning embedded value types
4378 // bug below, the current algorithm to layout embedded value types always put them at the
4379 // end of the layout, which doesn't match the different allocation policies the VM is
4380 // supposed to provide => FixMe
4381 // Note also that the current alignment policy is to make each value type starting on a
4382 // 64 bits boundary. This could be optimized later. For instance, it could be nice to
4383 // align value types according to their most constrained internal type.
4384 next_nonstatic_valuetype_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4385 int next_value_type_index = 0;
4386
4387 // Iterate over fields again and compute correct offsets.
4388 // The field allocation type was temporarily stored in the offset slot.
4389 // oop fields are located before non-oop fields (static and non-static).
4390 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4391
4392 // skip already laid out fields
4393 if (fs.is_offset_set()) continue;
4394
4395 // contended instance fields are handled below
4396 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4397
4398 int real_offset = 0;
4399 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4400
4401 // pack the rest of the fields
4402 switch (atype) {
4403 // Value types in static fields are handled with oops
4404 case STATIC_FLATTENABLE: // Fallthrough
4405 case STATIC_OOP:
4406 real_offset = next_static_oop_offset;
4407 next_static_oop_offset += heapOopSize;
4408 break;
4409 case STATIC_BYTE:
4410 real_offset = next_static_byte_offset;
4411 next_static_byte_offset += 1;
4412 break;
4413 case STATIC_SHORT:
4414 real_offset = next_static_short_offset;
4415 next_static_short_offset += BytesPerShort;
4416 break;
4417 case STATIC_WORD:
4418 real_offset = next_static_word_offset;
4419 next_static_word_offset += BytesPerInt;
4420 break;
4421 case STATIC_DOUBLE:
4422 real_offset = next_static_double_offset;
4423 next_static_double_offset += BytesPerLong;
4424 break;
4425 case NONSTATIC_FLATTENABLE:
4426 if (fs.is_flattened()) {
4427 Klass* klass = nonstatic_value_type_klasses[next_value_type_index];
4428 assert(klass != NULL, "Klass should have been loaded and resolved earlier");
4429 assert(klass->access_flags().is_value_type(),"Must be a value type");
4430 ValueKlass* vklass = ValueKlass::cast(klass);
4431 real_offset = next_nonstatic_valuetype_offset;
4432 next_nonstatic_valuetype_offset += (vklass->size_helper()) * wordSize - vklass->first_field_offset();
4433 // aligning next value type on a 64 bits boundary
4434 next_nonstatic_valuetype_offset = align_up(next_nonstatic_valuetype_offset, BytesPerLong);
4435 next_value_type_index += 1;
4436
4437 if (vklass->contains_oops()) { // add flatten oop maps
4438 int diff = real_offset - vklass->first_field_offset();
4439 const OopMapBlock* map = vklass->start_of_nonstatic_oop_maps();
4440 const OopMapBlock* const last_map = map + vklass->nonstatic_oop_map_count();
4441 while (map < last_map) {
4442 nonstatic_oop_maps->add(map->offset() + diff, map->count());
4443 map++;
4444 }
4445 }
4446 break;
4447 } else {
4448 // Fall through
4449 }
4450 case NONSTATIC_OOP:
4451 if( nonstatic_oop_space_count > 0 ) {
4452 real_offset = nonstatic_oop_space_offset;
4453 nonstatic_oop_space_offset += heapOopSize;
4454 nonstatic_oop_space_count -= 1;
4455 } else {
4456 real_offset = next_nonstatic_oop_offset;
4457 next_nonstatic_oop_offset += heapOopSize;
4458 }
4459 nonstatic_oop_maps->add(real_offset, 1);
4460 break;
4461 case NONSTATIC_BYTE:
4462 if( nonstatic_byte_space_count > 0 ) {
4463 real_offset = nonstatic_byte_space_offset;
4464 nonstatic_byte_space_offset += 1;
4465 nonstatic_byte_space_count -= 1;
4466 } else {
4467 real_offset = next_nonstatic_byte_offset;
4468 next_nonstatic_byte_offset += 1;
4469 }
4470 break;
4471 case NONSTATIC_SHORT:
4472 if( nonstatic_short_space_count > 0 ) {
4473 real_offset = nonstatic_short_space_offset;
4474 nonstatic_short_space_offset += BytesPerShort;
4475 nonstatic_short_space_count -= 1;
4476 } else {
4477 real_offset = next_nonstatic_short_offset;
4478 next_nonstatic_short_offset += BytesPerShort;
4479 }
4480 break;
4481 case NONSTATIC_WORD:
4482 if( nonstatic_word_space_count > 0 ) {
4483 real_offset = nonstatic_word_space_offset;
4484 nonstatic_word_space_offset += BytesPerInt;
4485 nonstatic_word_space_count -= 1;
4486 } else {
4487 real_offset = next_nonstatic_word_offset;
4488 next_nonstatic_word_offset += BytesPerInt;
4489 }
4490 break;
4491 case NONSTATIC_DOUBLE:
4492 real_offset = next_nonstatic_double_offset;
4493 next_nonstatic_double_offset += BytesPerLong;
4494 break;
4495 default:
4496 ShouldNotReachHere();
4497 }
4498 fs.set_offset(real_offset);
4499 }
4500
4501
4502 // Handle the contended cases.
4503 //
4504 // Each contended field should not intersect the cache line with another contended field.
4505 // In the absence of alignment information, we end up with pessimistically separating
4506 // the fields with full-width padding.
4507 //
4508 // Additionally, this should not break alignment for the fields, so we round the alignment up
4509 // for each field.
4510 if (nonstatic_contended_count > 0) {
4511
4512 // if there is at least one contended field, we need to have pre-padding for them
4513 next_nonstatic_padded_offset += ContendedPaddingWidth;
4514
4515 // collect all contended groups
4516 ResourceBitMap bm(cp->size());
4517 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4518 // skip already laid out fields
4519 if (fs.is_offset_set()) continue;
4520
4521 if (fs.is_contended()) {
4522 bm.set_bit(fs.contended_group());
4523 }
4524 }
4525
4526 int current_group = -1;
4527 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4528
4529 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4530
4531 // skip already laid out fields
4532 if (fs.is_offset_set()) continue;
4533
4534 // skip non-contended fields and fields from different group
4535 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4536
4537 // handle statics below
4538 if (fs.access_flags().is_static()) continue;
4539
4540 int real_offset = 0;
4541 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4542
4543 switch (atype) {
4544 case NONSTATIC_BYTE:
4545 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4546 real_offset = next_nonstatic_padded_offset;
4547 next_nonstatic_padded_offset += 1;
4548 break;
4549
4550 case NONSTATIC_SHORT:
4551 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4552 real_offset = next_nonstatic_padded_offset;
4553 next_nonstatic_padded_offset += BytesPerShort;
4554 break;
4555
4556 case NONSTATIC_WORD:
4557 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4558 real_offset = next_nonstatic_padded_offset;
4559 next_nonstatic_padded_offset += BytesPerInt;
4560 break;
4561
4562 case NONSTATIC_DOUBLE:
4563 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4564 real_offset = next_nonstatic_padded_offset;
4565 next_nonstatic_padded_offset += BytesPerLong;
4566 break;
4567
4568 // Value types in static fields are handled with oops
4569 case NONSTATIC_FLATTENABLE:
4570 throwValueTypeLimitation(THREAD_AND_LOCATION,
4571 "@Contended annotation not supported for value types yet", fs.name(), fs.signature());
4572 return;
4573
4574 case NONSTATIC_OOP:
4575 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4576 real_offset = next_nonstatic_padded_offset;
4577 next_nonstatic_padded_offset += heapOopSize;
4578 nonstatic_oop_maps->add(real_offset, 1);
4579 break;
4580
4581 default:
4582 ShouldNotReachHere();
4583 }
4584
4585 if (fs.contended_group() == 0) {
4586 // Contended group defines the equivalence class over the fields:
4587 // the fields within the same contended group are not inter-padded.
4588 // The only exception is default group, which does not incur the
4589 // equivalence, and so requires intra-padding.
4590 next_nonstatic_padded_offset += ContendedPaddingWidth;
4591 }
4592
4593 fs.set_offset(real_offset);
4594 } // for
4595
4596 // Start laying out the next group.
4597 // Note that this will effectively pad the last group in the back;
4598 // this is expected to alleviate memory contention effects for
4599 // subclass fields and/or adjacent object.
4600 // If this was the default group, the padding is already in place.
4601 if (current_group != 0) {
4602 next_nonstatic_padded_offset += ContendedPaddingWidth;
4603 }
4604 }
4605
4606 // handle static fields
4607 }
4608
4609 // Entire class is contended, pad in the back.
4610 // This helps to alleviate memory contention effects for subclass fields
4611 // and/or adjacent object.
4612 if (is_contended_class) {
4613 assert(!is_value_type(), "@Contended not supported for value types yet");
4614 next_nonstatic_padded_offset += ContendedPaddingWidth;
4615 }
4616
4617 int notaligned_nonstatic_fields_end;
4618 if (nonstatic_value_type_count != 0) {
4619 notaligned_nonstatic_fields_end = next_nonstatic_valuetype_offset;
4620 } else {
4621 notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4622 }
4623
4624 int nonstatic_field_sz_align = heapOopSize;
4625 if (is_value_type()) {
4626 if ((notaligned_nonstatic_fields_end - nonstatic_fields_start) > heapOopSize) {
4627 nonstatic_field_sz_align = BytesPerLong; // value copy of fields only uses jlong copy
4628 }
4629 }
4630 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, nonstatic_field_sz_align);
4631 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4632 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4633
4634 int static_field_size = (static_fields_end -
4635 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4636 nonstatic_field_size = nonstatic_field_size +
4637 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4638
4639 int instance_size = align_object_size(instance_end / wordSize);
4640
4641 assert(instance_size == align_object_size(align_up(
4642 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize)
4643 + initial_value_type_padding, wordSize) / wordSize), "consistent layout helper value");
4644
4645
4646 // Invariant: nonstatic_field end/start should only change if there are
4647 // nonstatic fields in the class, or if the class is contended. We compare
4648 // against the non-aligned value, so that end alignment will not fail the
4649 // assert without actually having the fields.
4650 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4651 is_contended_class ||
4652 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4653
4654 // Number of non-static oop map blocks allocated at end of klass.
4655 nonstatic_oop_maps->compact(THREAD);
4656
4657 #ifndef PRODUCT
4658 if ((PrintFieldLayout && !is_value_type()) ||
4659 (PrintValueLayout && (is_value_type() || has_nonstatic_value_fields))) {
4660 print_field_layout(_class_name,
4661 _fields,
4662 cp,
4663 instance_size,
4664 nonstatic_fields_start,
4665 nonstatic_fields_end,
4666 static_fields_end);
4667 nonstatic_oop_maps->print_on(tty);
4668 tty->print("\n");
4669 }
4670
4671 #endif
4672 // Pass back information needed for InstanceKlass creation
4673 info->oop_map_blocks = nonstatic_oop_maps;
4674 info->instance_size = instance_size;
4675 info->static_field_size = static_field_size;
4676 info->nonstatic_field_size = nonstatic_field_size;
4677 info->has_nonstatic_fields = has_nonstatic_fields;
4678 }
4679
4680 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik, TRAPS) {
4681 assert(ik != NULL, "invariant");
4682
4683 const Klass* const super = ik->super();
4684
4685 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4686 // in which case we don't have to register objects as finalizable
4687 if (!_has_empty_finalizer) {
4688 if (_has_finalizer ||
4689 (super != NULL && super->has_finalizer())) {
4690 ik->set_has_finalizer();
4691 }
4692 }
4693
4694 #ifdef ASSERT
4695 bool f = false;
4696 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4697 vmSymbols::void_method_signature());
4698 if (m != NULL && !m->is_empty_method()) {
4699 f = true;
4700 }
4701
4702 // Spec doesn't prevent agent from redefinition of empty finalizer.
4703 // Despite the fact that it's generally bad idea and redefined finalizer
4704 // will not work as expected we shouldn't abort vm in this case
4705 if (!ik->has_redefined_this_or_super()) {
4706 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4707 }
4708 #endif
4709
4710 // Check if this klass supports the java.lang.Cloneable interface
4711 if (SystemDictionary::Cloneable_klass_loaded()) {
4712 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4713 if (ik->is_value()) {
4714 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support Cloneable");
4715 return;
4716 }
4717 ik->set_is_cloneable();
4718 }
4719 }
4720
4721 // Check if this klass has a vanilla default constructor
4722 if (super == NULL) {
4723 // java.lang.Object has empty default constructor
4724 ik->set_has_vanilla_constructor();
4725 } else {
4726 if (super->has_vanilla_constructor() &&
4727 _has_vanilla_constructor) {
4728 ik->set_has_vanilla_constructor();
4729 }
4730 #ifdef ASSERT
4731 bool v = false;
4732 if (super->has_vanilla_constructor()) {
4733 const Method* const constructor =
4734 ik->find_method(vmSymbols::object_initializer_name(),
4735 vmSymbols::void_method_signature());
4736 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4737 v = true;
4738 }
4739 }
4740 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4741 #endif
4742 }
4743
4744 // If it cannot be fast-path allocated, set a bit in the layout helper.
4745 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4746 assert(ik->size_helper() > 0, "layout_helper is initialized");
4747 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4748 || ik->is_abstract() || ik->is_interface()
4749 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4750 || ik->size_helper() >= FastAllocateSizeLimit) {
4751 // Forbid fast-path allocation.
4752 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4753 ik->set_layout_helper(lh);
4754 }
4755 }
4756
4757 bool ClassFileParser::supports_value_types() const {
4758 // Value types are only supported by class file version 55 and later
4759 return _major_version >= JAVA_11_VERSION;
4760 }
4761
4762 // utility methods for appending an array with check for duplicates
4763
4764 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4765 const Array<InstanceKlass*>* const ifs) {
4766 // iterate over new interfaces
4767 for (int i = 0; i < ifs->length(); i++) {
4768 InstanceKlass* const e = ifs->at(i);
4769 assert(e->is_klass() && e->is_interface(), "just checking");
4770 // add new interface
4771 result->append_if_missing(e);
4772 }
4773 }
4774
4775 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4776 Array<InstanceKlass*>* local_ifs,
4777 ClassLoaderData* loader_data,
4778 TRAPS) {
4779 assert(local_ifs != NULL, "invariant");
4780 assert(loader_data != NULL, "invariant");
4781
4782 // Compute maximum size for transitive interfaces
4783 int max_transitive_size = 0;
4784 int super_size = 0;
4785 // Add superclass transitive interfaces size
4786 if (super != NULL) {
4787 super_size = super->transitive_interfaces()->length();
4788 max_transitive_size += super_size;
4789 }
4790 // Add local interfaces' super interfaces
4791 const int local_size = local_ifs->length();
4792 for (int i = 0; i < local_size; i++) {
4793 InstanceKlass* const l = local_ifs->at(i);
4794 max_transitive_size += l->transitive_interfaces()->length();
4795 }
4796 // Finally add local interfaces
4797 max_transitive_size += local_size;
4798 // Construct array
4799 if (max_transitive_size == 0) {
4800 // no interfaces, use canonicalized array
4801 return Universe::the_empty_instance_klass_array();
4802 } else if (max_transitive_size == super_size) {
4803 // no new local interfaces added, share superklass' transitive interface array
4804 return super->transitive_interfaces();
4805 } else if (max_transitive_size == local_size) {
4806 // only local interfaces added, share local interface array
4807 return local_ifs;
4808 } else {
4809 ResourceMark rm;
4810 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4811
4812 // Copy down from superclass
4813 if (super != NULL) {
4814 append_interfaces(result, super->transitive_interfaces());
4815 }
4816
4817 // Copy down from local interfaces' superinterfaces
4818 for (int i = 0; i < local_size; i++) {
4819 InstanceKlass* const l = local_ifs->at(i);
4820 append_interfaces(result, l->transitive_interfaces());
4821 }
4822 // Finally add local interfaces
4823 append_interfaces(result, local_ifs);
4824
4825 // length will be less than the max_transitive_size if duplicates were removed
4826 const int length = result->length();
4827 assert(length <= max_transitive_size, "just checking");
4828 Array<InstanceKlass*>* const new_result =
4829 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4830 for (int i = 0; i < length; i++) {
4831 InstanceKlass* const e = result->at(i);
4832 assert(e != NULL, "just checking");
4833 new_result->at_put(i, e);
4834 }
4835 return new_result;
4836 }
4837 }
4838
4839 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4840 assert(this_klass != NULL, "invariant");
4841 const Klass* const super = this_klass->super();
4842 if (super != NULL) {
4843
4844 // If the loader is not the boot loader then throw an exception if its
4845 // superclass is in package jdk.internal.reflect and its loader is not a
4846 // special reflection class loader
4847 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4848 assert(super->is_instance_klass(), "super is not instance klass");
4849 PackageEntry* super_package = super->package();
4850 if (super_package != NULL &&
4851 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4852 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4853 ResourceMark rm(THREAD);
4854 Exceptions::fthrow(
4855 THREAD_AND_LOCATION,
4856 vmSymbols::java_lang_IllegalAccessError(),
4857 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4858 this_klass->external_name(),
4859 this_klass->class_loader_data()->loader_name_and_id(),
4860 super->external_name());
4861 return;
4862 }
4863 }
4864
4865 Reflection::VerifyClassAccessResults vca_result =
4866 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4867 if (vca_result != Reflection::ACCESS_OK) {
4868 ResourceMark rm(THREAD);
4869 char* msg = Reflection::verify_class_access_msg(this_klass,
4870 InstanceKlass::cast(super),
4871 vca_result);
4872 if (msg == NULL) {
4873 bool same_module = (this_klass->module() == super->module());
4874 Exceptions::fthrow(
4875 THREAD_AND_LOCATION,
4876 vmSymbols::java_lang_IllegalAccessError(),
4877 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4878 this_klass->external_name(),
4879 super->is_abstract() ? "abstract " : "",
4880 super->external_name(),
4881 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4882 (same_module) ? "" : "; ",
4883 (same_module) ? "" : super->class_in_module_of_loader());
4884 } else {
4885 // Add additional message content.
4886 Exceptions::fthrow(
4887 THREAD_AND_LOCATION,
4888 vmSymbols::java_lang_IllegalAccessError(),
4889 "superclass access check failed: %s",
4890 msg);
4891 }
4892 }
4893 }
4894 }
4895
4896
4897 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4898 assert(this_klass != NULL, "invariant");
4899 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4900 const int lng = local_interfaces->length();
4901 for (int i = lng - 1; i >= 0; i--) {
4902 InstanceKlass* const k = local_interfaces->at(i);
4903 assert (k != NULL && k->is_interface(), "invalid interface");
4904 Reflection::VerifyClassAccessResults vca_result =
4905 Reflection::verify_class_access(this_klass, k, false);
4906 if (vca_result != Reflection::ACCESS_OK) {
4907 ResourceMark rm(THREAD);
4908 char* msg = Reflection::verify_class_access_msg(this_klass,
4909 k,
4910 vca_result);
4911 if (msg == NULL) {
4912 bool same_module = (this_klass->module() == k->module());
4913 Exceptions::fthrow(
4914 THREAD_AND_LOCATION,
4915 vmSymbols::java_lang_IllegalAccessError(),
4916 "class %s cannot access its superinterface %s (%s%s%s)",
4917 this_klass->external_name(),
4918 k->external_name(),
4919 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4920 (same_module) ? "" : "; ",
4921 (same_module) ? "" : k->class_in_module_of_loader());
4922 } else {
4923 // Add additional message content.
4924 Exceptions::fthrow(
4925 THREAD_AND_LOCATION,
4926 vmSymbols::java_lang_IllegalAccessError(),
4927 "superinterface check failed: %s",
4928 msg);
4929 }
4930 }
4931 }
4932 }
4933
4934
4935 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4936 assert(this_klass != NULL, "invariant");
4937 const Array<Method*>* const methods = this_klass->methods();
4938 const int num_methods = methods->length();
4939
4940 // go thru each method and check if it overrides a final method
4941 for (int index = 0; index < num_methods; index++) {
4942 const Method* const m = methods->at(index);
4943
4944 // skip private, static, and <init> methods
4945 if ((!m->is_private() && !m->is_static()) &&
4946 (m->name() != vmSymbols::object_initializer_name())) {
4947
4948 const Symbol* const name = m->name();
4949 const Symbol* const signature = m->signature();
4950 const Klass* k = this_klass->super();
4951 const Method* super_m = NULL;
4952 while (k != NULL) {
4953 // skip supers that don't have final methods.
4954 if (k->has_final_method()) {
4955 // lookup a matching method in the super class hierarchy
4956 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4957 if (super_m == NULL) {
4958 break; // didn't find any match; get out
4959 }
4960
4961 if (super_m->is_final() && !super_m->is_static() &&
4962 !super_m->access_flags().is_private()) {
4963 // matching method in super is final, and not static or private
4964 bool can_access = Reflection::verify_member_access(this_klass,
4965 super_m->method_holder(),
4966 super_m->method_holder(),
4967 super_m->access_flags(),
4968 false, false, CHECK);
4969 if (can_access) {
4970 // this class can access super final method and therefore override
4971 ResourceMark rm(THREAD);
4972 Exceptions::fthrow(THREAD_AND_LOCATION,
4973 vmSymbols::java_lang_VerifyError(),
4974 "class %s overrides final method %s.%s%s",
4975 this_klass->external_name(),
4976 super_m->method_holder()->external_name(),
4977 name->as_C_string(),
4978 signature->as_C_string()
4979 );
4980 return;
4981 }
4982 }
4983
4984 // continue to look from super_m's holder's super.
4985 k = super_m->method_holder()->super();
4986 continue;
4987 }
4988
4989 k = k->super();
4990 }
4991 }
4992 }
4993 }
4994
4995
4996 // assumes that this_klass is an interface
4997 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4998 assert(this_klass != NULL, "invariant");
4999 assert(this_klass->is_interface(), "not an interface");
5000 const Array<Method*>* methods = this_klass->methods();
5001 const int num_methods = methods->length();
5002
5003 for (int index = 0; index < num_methods; index++) {
5004 const Method* const m = methods->at(index);
5005 // if m is static and not the init method, throw a verify error
5006 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
5007 ResourceMark rm(THREAD);
5008 Exceptions::fthrow(
5009 THREAD_AND_LOCATION,
5010 vmSymbols::java_lang_VerifyError(),
5011 "Illegal static method %s in interface %s",
5012 m->name()->as_C_string(),
5013 this_klass->external_name()
5014 );
5015 return;
5016 }
5017 }
5018 }
5019
5020 // utility methods for format checking
5021
5022 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
5023 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5024 const bool is_value_type = (flags & JVM_ACC_VALUE) != 0;
5025 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
5026 assert(supports_value_types() || !is_value_type, "JVM_ACC_VALUE should not be set");
5027 if (is_module) {
5028 ResourceMark rm(THREAD);
5029 Exceptions::fthrow(
5030 THREAD_AND_LOCATION,
5031 vmSymbols::java_lang_NoClassDefFoundError(),
5032 "%s is not a class because access_flag ACC_MODULE is set",
5033 _class_name->as_C_string());
5034 return;
5035 }
5036
5037 if (is_value_type && !EnableValhalla) {
5038 ResourceMark rm(THREAD);
5039 Exceptions::fthrow(
5040 THREAD_AND_LOCATION,
5041 vmSymbols::java_lang_ClassFormatError(),
5042 "Class modifier ACC_VALUE in class %s requires option -XX:+EnableValhalla",
5043 _class_name->as_C_string()
5044 );
5045 }
5046
5047 if (!_need_verify) { return; }
5048
5049 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5050 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5051 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5052 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
5053 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5054 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
5055 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5056
5057 if ((is_abstract && is_final) ||
5058 (is_interface && !is_abstract) ||
5059 (is_interface && major_gte_15 && (is_super || is_enum)) ||
5060 (!is_interface && major_gte_15 && is_annotation) ||
5061 (is_value_type && (is_interface || is_abstract || is_enum || !is_final))) {
5062 ResourceMark rm(THREAD);
5063 const char* class_note = "";
5064 if (is_value_type) class_note = " (an inline class)";
5065 Exceptions::fthrow(
5066 THREAD_AND_LOCATION,
5067 vmSymbols::java_lang_ClassFormatError(),
5068 "Illegal class modifiers in class %s%s: 0x%X",
5069 _class_name->as_C_string(), class_note, flags
5070 );
5071 return;
5072 }
5073 }
5074
5075 static bool has_illegal_visibility(jint flags) {
5076 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5077 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5078 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5079
5080 return ((is_public && is_protected) ||
5081 (is_public && is_private) ||
5082 (is_protected && is_private));
5083 }
5084
5085 // A legal major_version.minor_version must be one of the following:
5086 //
5087 // Major_version = 45, any minor_version.
5088 // Major_version >= 46 and major_version <= current_major_version and minor_version = 0.
5089 // Major_version = current_major_version and minor_version = 65535 and --enable-preview is present.
5090 //
5091 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
5092 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
5093 if (major != JAVA_MIN_SUPPORTED_VERSION) { // All 45.* are ok including 45.65535
5094 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
5095 if (major != max_version) {
5096 ResourceMark rm(THREAD);
5097 Exceptions::fthrow(
5098 THREAD_AND_LOCATION,
5099 vmSymbols::java_lang_UnsupportedClassVersionError(),
5100 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
5101 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
5102 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
5103 return;
5104 }
5105
5106 if (!Arguments::enable_preview()) {
5107 ResourceMark rm(THREAD);
5108 Exceptions::fthrow(
5109 THREAD_AND_LOCATION,
5110 vmSymbols::java_lang_UnsupportedClassVersionError(),
5111 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
5112 class_name->as_C_string(), major, minor);
5113 return;
5114 }
5115
5116 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
5117 if (major > max_version) {
5118 ResourceMark rm(THREAD);
5119 Exceptions::fthrow(
5120 THREAD_AND_LOCATION,
5121 vmSymbols::java_lang_UnsupportedClassVersionError(),
5122 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5123 "this version of the Java Runtime only recognizes class file versions up to %u.0",
5124 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
5125 } else if (major < JAVA_MIN_SUPPORTED_VERSION) {
5126 ResourceMark rm(THREAD);
5127 Exceptions::fthrow(
5128 THREAD_AND_LOCATION,
5129 vmSymbols::java_lang_UnsupportedClassVersionError(),
5130 "%s (class file version %u.%u) was compiled with an invalid major version",
5131 class_name->as_C_string(), major, minor);
5132 } else if (minor != 0) {
5133 ResourceMark rm(THREAD);
5134 Exceptions::fthrow(
5135 THREAD_AND_LOCATION,
5136 vmSymbols::java_lang_UnsupportedClassVersionError(),
5137 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
5138 class_name->as_C_string(), major, minor);
5139 }
5140 }
5141 }
5142 }
5143
5144 void ClassFileParser::verify_legal_field_modifiers(jint flags,
5145 bool is_interface,
5146 bool is_value_type,
5147 TRAPS) const {
5148 if (!_need_verify) { return; }
5149
5150 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5151 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5152 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5153 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5154 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5155 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
5156 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
5157 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5158 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5159
5160 bool is_illegal = false;
5161
5162 if (is_interface) {
5163 if (!is_public || !is_static || !is_final || is_private ||
5164 is_protected || is_volatile || is_transient ||
5165 (major_gte_15 && is_enum)) {
5166 is_illegal = true;
5167 }
5168 } else { // not interface
5169 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
5170 is_illegal = true;
5171 } else {
5172 if (is_value_type && !is_static && !is_final) {
5173 is_illegal = true;
5174 }
5175 }
5176 }
5177
5178 if (is_illegal) {
5179 ResourceMark rm(THREAD);
5180 Exceptions::fthrow(
5181 THREAD_AND_LOCATION,
5182 vmSymbols::java_lang_ClassFormatError(),
5183 "Illegal field modifiers in class %s: 0x%X",
5184 _class_name->as_C_string(), flags);
5185 return;
5186 }
5187 }
5188
5189 void ClassFileParser::verify_legal_method_modifiers(jint flags,
5190 bool is_interface,
5191 bool is_value_type,
5192 const Symbol* name,
5193 TRAPS) const {
5194 if (!_need_verify) { return; }
5195
5196 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5197 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5198 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5199 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5200 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
5201 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5202 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
5203 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
5204 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
5205 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5206 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5207 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
5208 const bool is_initializer = (name == vmSymbols::object_initializer_name());
5209
5210 bool is_illegal = false;
5211
5212 const char* class_note = "";
5213
5214 if (is_interface) {
5215 if (major_gte_8) {
5216 // Class file version is JAVA_8_VERSION or later Methods of
5217 // interfaces may set any of the flags except ACC_PROTECTED,
5218 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5219 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5220 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5221 (is_native || is_protected || is_final || is_synchronized) ||
5222 // If a specific method of a class or interface has its
5223 // ACC_ABSTRACT flag set, it must not have any of its
5224 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5225 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
5226 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5227 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5228 (is_abstract && (is_private || is_static || is_strict))) {
5229 is_illegal = true;
5230 }
5231 } else if (major_gte_15) {
5232 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5233 if (!is_public || is_private || is_protected || is_static || is_final ||
5234 is_synchronized || is_native || !is_abstract || is_strict) {
5235 is_illegal = true;
5236 }
5237 } else {
5238 // Class file version is pre-JAVA_1_5_VERSION
5239 if (!is_public || is_static || is_final || is_native || !is_abstract) {
5240 is_illegal = true;
5241 }
5242 }
5243 } else { // not interface
5244 if (has_illegal_visibility(flags)) {
5245 is_illegal = true;
5246 } else {
5247 if (is_initializer) {
5248 if (is_final || is_synchronized || is_native ||
5249 is_abstract || (major_gte_15 && is_bridge)) {
5250 is_illegal = true;
5251 }
5252 if (!is_static && !is_value_type) {
5253 // OK, an object constructor in a regular class
5254 } else if (is_static && is_value_type) {
5255 // OK, a static init factory in an inline class
5256 } else {
5257 // but no other combinations are allowed
5258 is_illegal = true;
5259 class_note = (is_value_type ? " (an inline class)" : " (not an inline class)");
5260 }
5261 } else { // not initializer
5262 if (is_value_type && is_synchronized && !is_static) {
5263 is_illegal = true;
5264 class_note = " (an inline class)";
5265 } else {
5266 if (is_abstract) {
5267 if ((is_final || is_native || is_private || is_static ||
5268 (major_gte_15 && (is_synchronized || is_strict)))) {
5269 is_illegal = true;
5270 }
5271 }
5272 }
5273 }
5274 }
5275 }
5276
5277 if (is_illegal) {
5278 ResourceMark rm(THREAD);
5279 Exceptions::fthrow(
5280 THREAD_AND_LOCATION,
5281 vmSymbols::java_lang_ClassFormatError(),
5282 "Method %s in class %s%s has illegal modifiers: 0x%X",
5283 name->as_C_string(), _class_name->as_C_string(), class_note, flags);
5284 return;
5285 }
5286 }
5287
5288 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5289 int length,
5290 TRAPS) const {
5291 assert(_need_verify, "only called when _need_verify is true");
5292 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5293 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5294 }
5295 }
5296
5297 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5298 // In class names, '/' separates unqualified names. This is verified in this function also.
5299 // Method names also may not contain the characters '<' or '>', unless <init>
5300 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5301 // method. Because these names have been checked as special cases before
5302 // calling this method in verify_legal_method_name.
5303 //
5304 // This method is also called from the modular system APIs in modules.cpp
5305 // to verify the validity of module and package names.
5306 bool ClassFileParser::verify_unqualified_name(const char* name,
5307 unsigned int length,
5308 int type) {
5309 for (const char* p = name; p != name + length; p++) {
5310 switch(*p) {
5311 case '.':
5312 case ';':
5313 case '[':
5314 // do not permit '.', ';', or '['
5315 return false;
5316 case '/':
5317 // check for '//' or leading or trailing '/' which are not legal
5318 // unqualified name must not be empty
5319 if (type == ClassFileParser::LegalClass) {
5320 if (p == name || p+1 >= name+length || *(p+1) == '/') {
5321 return false;
5322 }
5323 } else {
5324 return false; // do not permit '/' unless it's class name
5325 }
5326 break;
5327 case '<':
5328 case '>':
5329 // do not permit '<' or '>' in method names
5330 if (type == ClassFileParser::LegalMethod) {
5331 return false;
5332 }
5333 }
5334 }
5335 return true;
5336 }
5337
5338 // Take pointer to a UTF8 byte string (not NUL-terminated).
5339 // Skip over the longest part of the string that could
5340 // be taken as a fieldname. Allow '/' if slash_ok is true.
5341 // Return a pointer to just past the fieldname.
5342 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5343 // being true, we saw consecutive slashes (meaning we were looking for a
5344 // qualified path but found something that was badly-formed).
5345 static const char* skip_over_field_name(const char* const name,
5346 bool slash_ok,
5347 unsigned int length) {
5348 const char* p;
5349 jboolean last_is_slash = false;
5350 jboolean not_first_ch = false;
5351
5352 for (p = name; p != name + length; not_first_ch = true) {
5353 const char* old_p = p;
5354 jchar ch = *p;
5355 if (ch < 128) {
5356 p++;
5357 // quick check for ascii
5358 if ((ch >= 'a' && ch <= 'z') ||
5359 (ch >= 'A' && ch <= 'Z') ||
5360 (ch == '_' || ch == '$') ||
5361 (not_first_ch && ch >= '0' && ch <= '9')) {
5362 last_is_slash = false;
5363 continue;
5364 }
5365 if (slash_ok && ch == '/') {
5366 if (last_is_slash) {
5367 return NULL; // Don't permit consecutive slashes
5368 }
5369 last_is_slash = true;
5370 continue;
5371 }
5372 }
5373 else {
5374 jint unicode_ch;
5375 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5376 p = tmp_p;
5377 last_is_slash = false;
5378 // Check if ch is Java identifier start or is Java identifier part
5379 // 4672820: call java.lang.Character methods directly without generating separate tables.
5380 EXCEPTION_MARK;
5381 // return value
5382 JavaValue result(T_BOOLEAN);
5383 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
5384 JavaCallArguments args;
5385 args.push_int(unicode_ch);
5386
5387 if (not_first_ch) {
5388 // public static boolean isJavaIdentifierPart(char ch);
5389 JavaCalls::call_static(&result,
5390 SystemDictionary::Character_klass(),
5391 vmSymbols::isJavaIdentifierPart_name(),
5392 vmSymbols::int_bool_signature(),
5393 &args,
5394 THREAD);
5395 } else {
5396 // public static boolean isJavaIdentifierStart(char ch);
5397 JavaCalls::call_static(&result,
5398 SystemDictionary::Character_klass(),
5399 vmSymbols::isJavaIdentifierStart_name(),
5400 vmSymbols::int_bool_signature(),
5401 &args,
5402 THREAD);
5403 }
5404 if (HAS_PENDING_EXCEPTION) {
5405 CLEAR_PENDING_EXCEPTION;
5406 return NULL;
5407 }
5408 if(result.get_jboolean()) {
5409 continue;
5410 }
5411 }
5412 return (not_first_ch) ? old_p : NULL;
5413 }
5414 return (not_first_ch) ? p : NULL;
5415 }
5416
5417 // Take pointer to a UTF8 byte string (not NUL-terminated).
5418 // Skip over the longest part of the string that could
5419 // be taken as a field signature. Allow "void" if void_ok.
5420 // Return a pointer to just past the signature.
5421 // Return NULL if no legal signature is found.
5422 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5423 bool void_ok,
5424 unsigned int length,
5425 TRAPS) const {
5426 unsigned int array_dim = 0;
5427 while (length > 0) {
5428 switch (signature[0]) {
5429 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5430 case JVM_SIGNATURE_BOOLEAN:
5431 case JVM_SIGNATURE_BYTE:
5432 case JVM_SIGNATURE_CHAR:
5433 case JVM_SIGNATURE_SHORT:
5434 case JVM_SIGNATURE_INT:
5435 case JVM_SIGNATURE_FLOAT:
5436 case JVM_SIGNATURE_LONG:
5437 case JVM_SIGNATURE_DOUBLE:
5438 return signature + 1;
5439 case JVM_SIGNATURE_VALUETYPE:
5440 // Can't enable this check until JDK upgrades the bytecode generators
5441 // if (_major_version < CONSTANT_CLASS_DESCRIPTORS ) {
5442 // classfile_parse_error("Class name contains illegal Q-signature "
5443 // "in descriptor in class file %s",
5444 // CHECK_0);
5445 // }
5446 // fall through
5447 case JVM_SIGNATURE_CLASS:
5448 {
5449 if (_major_version < JAVA_1_5_VERSION) {
5450 // Skip over the class name if one is there
5451 const char* const p = skip_over_field_name(signature + 1, true, --length);
5452
5453 // The next character better be a semicolon
5454 if (p && (p - signature) > 1 && p[0] == ';') {
5455 return p + 1;
5456 }
5457 }
5458 else {
5459 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
5460 signature++;
5461 const char* c = (const char*) memchr(signature, ';', length - 1);
5462 // Format check signature
5463 if (c != NULL) {
5464 int newlen = c - (char*) signature;
5465 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5466 if (!legal) {
5467 classfile_parse_error("Class name contains illegal character "
5468 "in descriptor in class file %s",
5469 CHECK_0);
5470 return NULL;
5471 }
5472 return signature + newlen + 1;
5473 }
5474 }
5475 return NULL;
5476 }
5477 case JVM_SIGNATURE_ARRAY:
5478 array_dim++;
5479 if (array_dim > 255) {
5480 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5481 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5482 }
5483 // The rest of what's there better be a legal signature
5484 signature++;
5485 length--;
5486 void_ok = false;
5487 break;
5488 default:
5489 return NULL;
5490 }
5491 }
5492 return NULL;
5493 }
5494
5495 // Checks if name is a legal class name.
5496 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5497 if (!_need_verify || _relax_verify) { return; }
5498
5499 assert(name->refcount() > 0, "symbol must be kept alive");
5500 char* bytes = (char*)name->bytes();
5501 unsigned int length = name->utf8_length();
5502 bool legal = false;
5503
5504 if (length > 0) {
5505 const char* p;
5506 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5507 p = skip_over_field_signature(bytes, false, length, CHECK);
5508 legal = (p != NULL) && ((p - bytes) == (int)length);
5509 } else if (_major_version < JAVA_1_5_VERSION) {
5510 if (bytes[0] != '<') {
5511 p = skip_over_field_name(bytes, true, length);
5512 legal = (p != NULL) && ((p - bytes) == (int)length);
5513 }
5514 } else if (_major_version >= CONSTANT_CLASS_DESCRIPTORS && bytes[length - 1] == ';' ) {
5515 // Support for L...; and Q...; descriptors
5516 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
5517 } else {
5518 // 4900761: relax the constraints based on JSR202 spec
5519 // Class names may be drawn from the entire Unicode character set.
5520 // Identifiers between '/' must be unqualified names.
5521 // The utf8 string has been verified when parsing cpool entries.
5522 legal = verify_unqualified_name(bytes, length, LegalClass);
5523 }
5524 }
5525 if (!legal) {
5526 ResourceMark rm(THREAD);
5527 assert(_class_name != NULL, "invariant");
5528 Exceptions::fthrow(
5529 THREAD_AND_LOCATION,
5530 vmSymbols::java_lang_ClassFormatError(),
5531 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5532 _class_name->as_C_string()
5533 );
5534 return;
5535 }
5536 }
5537
5538 // Checks if name is a legal field name.
5539 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5540 if (!_need_verify || _relax_verify) { return; }
5541
5542 char* bytes = (char*)name->bytes();
5543 unsigned int length = name->utf8_length();
5544 bool legal = false;
5545
5546 if (length > 0) {
5547 if (_major_version < JAVA_1_5_VERSION) {
5548 if (bytes[0] != '<') {
5549 const char* p = skip_over_field_name(bytes, false, length);
5550 legal = (p != NULL) && ((p - bytes) == (int)length);
5551 }
5552 } else {
5553 // 4881221: relax the constraints based on JSR202 spec
5554 legal = verify_unqualified_name(bytes, length, LegalField);
5555 }
5556 }
5557
5558 if (!legal) {
5559 ResourceMark rm(THREAD);
5560 assert(_class_name != NULL, "invariant");
5561 Exceptions::fthrow(
5562 THREAD_AND_LOCATION,
5563 vmSymbols::java_lang_ClassFormatError(),
5564 "Illegal field name \"%.*s\" in class %s", length, bytes,
5565 _class_name->as_C_string()
5566 );
5567 return;
5568 }
5569 }
5570
5571 // Checks if name is a legal method name.
5572 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5573 if (!_need_verify || _relax_verify) { return; }
5574
5575 assert(name != NULL, "method name is null");
5576 char* bytes = (char*)name->bytes();
5577 unsigned int length = name->utf8_length();
5578 bool legal = false;
5579
5580 if (length > 0) {
5581 if (bytes[0] == '<') {
5582 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5583 legal = true;
5584 }
5585 } else if (_major_version < JAVA_1_5_VERSION) {
5586 const char* p;
5587 p = skip_over_field_name(bytes, false, length);
5588 legal = (p != NULL) && ((p - bytes) == (int)length);
5589 } else {
5590 // 4881221: relax the constraints based on JSR202 spec
5591 legal = verify_unqualified_name(bytes, length, LegalMethod);
5592 }
5593 }
5594
5595 if (!legal) {
5596 ResourceMark rm(THREAD);
5597 assert(_class_name != NULL, "invariant");
5598 Exceptions::fthrow(
5599 THREAD_AND_LOCATION,
5600 vmSymbols::java_lang_ClassFormatError(),
5601 "Illegal method name \"%.*s\" in class %s", length, bytes,
5602 _class_name->as_C_string()
5603 );
5604 return;
5605 }
5606 }
5607
5608
5609 // Checks if signature is a legal field signature.
5610 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5611 const Symbol* signature,
5612 TRAPS) const {
5613 if (!_need_verify) { return; }
5614
5615 const char* const bytes = (const char* const)signature->bytes();
5616 const unsigned int length = signature->utf8_length();
5617 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5618
5619 if (p == NULL || (p - bytes) != (int)length) {
5620 throwIllegalSignature("Field", name, signature, CHECK);
5621 }
5622 }
5623
5624 // Checks if signature is a legal method signature.
5625 // Returns number of parameters
5626 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5627 const Symbol* signature,
5628 TRAPS) const {
5629 if (!_need_verify) {
5630 // make sure caller's args_size will be less than 0 even for non-static
5631 // method so it will be recomputed in compute_size_of_parameters().
5632 return -2;
5633 }
5634
5635 // Class initializers cannot have args for class format version >= 51.
5636 if (name == vmSymbols::class_initializer_name() &&
5637 signature != vmSymbols::void_method_signature() &&
5638 _major_version >= JAVA_7_VERSION) {
5639 throwIllegalSignature("Method", name, signature, CHECK_0);
5640 return 0;
5641 }
5642
5643 unsigned int args_size = 0;
5644 const char* p = (const char*)signature->bytes();
5645 unsigned int length = signature->utf8_length();
5646 const char* nextp;
5647
5648 // The first character must be a '('
5649 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5650 length--;
5651 // Skip over legal field signatures
5652 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5653 while ((length > 0) && (nextp != NULL)) {
5654 args_size++;
5655 if (p[0] == 'J' || p[0] == 'D') {
5656 args_size++;
5657 }
5658 length -= nextp - p;
5659 p = nextp;
5660 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5661 }
5662 // The first non-signature thing better be a ')'
5663 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5664 length--;
5665 if (name->utf8_length() > 0 && name->char_at(0) == '<') {
5666 // All constructor methods must return void
5667 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5668 return args_size;
5669 }
5670 // All static init methods must return the current class
5671 if ((length >= 3) && (p[length-1] == JVM_SIGNATURE_ENDCLASS)
5672 && name == vmSymbols::object_initializer_name()) {
5673 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5674 if (nextp && ((int)length == (nextp - p))) {
5675 // The actual class will be checked against current class
5676 // when the method is defined (see parse_method).
5677 // A reference to a static init with a bad return type
5678 // will load and verify OK, but will fail to link.
5679 return args_size;
5680 }
5681 }
5682 // The distinction between static factory methods and
5683 // constructors depends on the JVM_ACC_STATIC modifier.
5684 // This distinction must be reflected in a void or non-void
5685 // return. For declared methods, the check is in parse_method.
5686 } else {
5687 // Now we better just have a return value
5688 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5689 if (nextp && ((int)length == (nextp - p))) {
5690 return args_size;
5691 }
5692 }
5693 }
5694 }
5695 // Report error
5696 throwIllegalSignature("Method", name, signature, CHECK_0);
5697 return 0;
5698 }
5699
5700 int ClassFileParser::static_field_size() const {
5701 assert(_field_info != NULL, "invariant");
5702 return _field_info->static_field_size;
5703 }
5704
5705 int ClassFileParser::total_oop_map_count() const {
5706 assert(_field_info != NULL, "invariant");
5707 return _field_info->oop_map_blocks->nonstatic_oop_map_count;
5708 }
5709
5710 jint ClassFileParser::layout_size() const {
5711 assert(_field_info != NULL, "invariant");
5712 return _field_info->instance_size;
5713 }
5714
5715 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5716 const Array<Method*>* methods) {
5717 assert(ik != NULL, "invariant");
5718 assert(methods != NULL, "invariant");
5719
5720 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5721 // (We used to do this lazily, but now we query it in Rewriter,
5722 // which is eagerly done for every method, so we might as well do it now,
5723 // when everything is fresh in memory.)
5724 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5725
5726 if (klass_id != vmSymbols::NO_SID) {
5727 for (int j = 0; j < methods->length(); ++j) {
5728 Method* method = methods->at(j);
5729 method->init_intrinsic_id();
5730
5731 if (CheckIntrinsics) {
5732 // Check if an intrinsic is defined for method 'method',
5733 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5734 if (method->intrinsic_id() != vmIntrinsics::_none &&
5735 !method->intrinsic_candidate()) {
5736 tty->print("Compiler intrinsic is defined for method [%s], "
5737 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5738 method->name_and_sig_as_C_string(),
5739 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5740 );
5741 tty->cr();
5742 DEBUG_ONLY(vm_exit(1));
5743 }
5744 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5745 // but there is no intrinsic available for it.
5746 if (method->intrinsic_candidate() &&
5747 method->intrinsic_id() == vmIntrinsics::_none) {
5748 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5749 "but no compiler intrinsic is defined for the method.%s",
5750 method->name_and_sig_as_C_string(),
5751 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5752 );
5753 tty->cr();
5754 DEBUG_ONLY(vm_exit(1));
5755 }
5756 }
5757 } // end for
5758
5759 #ifdef ASSERT
5760 if (CheckIntrinsics) {
5761 // Check for orphan methods in the current class. A method m
5762 // of a class C is orphan if an intrinsic is defined for method m,
5763 // but class C does not declare m.
5764 // The check is potentially expensive, therefore it is available
5765 // only in debug builds.
5766
5767 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5768 if (vmIntrinsics::_compiledLambdaForm == id) {
5769 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5770 // generated for the JVM from a LambdaForm and therefore no method
5771 // is defined for it.
5772 continue;
5773 }
5774
5775 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5776 // Check if the current class contains a method with the same
5777 // name, flags, signature.
5778 bool match = false;
5779 for (int j = 0; j < methods->length(); ++j) {
5780 const Method* method = methods->at(j);
5781 if (method->intrinsic_id() == id) {
5782 match = true;
5783 break;
5784 }
5785 }
5786
5787 if (!match) {
5788 char buf[1000];
5789 tty->print("Compiler intrinsic is defined for method [%s], "
5790 "but the method is not available in class [%s].%s",
5791 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5792 buf, sizeof(buf)),
5793 ik->name()->as_C_string(),
5794 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5795 );
5796 tty->cr();
5797 DEBUG_ONLY(vm_exit(1));
5798 }
5799 }
5800 } // end for
5801 } // CheckIntrinsics
5802 #endif // ASSERT
5803 }
5804 }
5805
5806 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5807 if (_klass != NULL) {
5808 return _klass;
5809 }
5810
5811 InstanceKlass* const ik =
5812 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5813
5814 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5815
5816 assert(_klass == ik, "invariant");
5817
5818
5819 if (ik->should_store_fingerprint()) {
5820 ik->store_fingerprint(_stream->compute_fingerprint());
5821 }
5822
5823 ik->set_has_passed_fingerprint_check(false);
5824 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5825 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5826 uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint();
5827 if (aot_fp != 0 && aot_fp == fp) {
5828 // This class matches with a class saved in an AOT library
5829 ik->set_has_passed_fingerprint_check(true);
5830 } else {
5831 ResourceMark rm;
5832 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5833 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5834 }
5835 }
5836
5837 if (ik->is_value()) {
5838 ValueKlass* vk = ValueKlass::cast(ik);
5839 oop val = ik->allocate_instance(CHECK_NULL);
5840 vk->set_default_value(val);
5841 }
5842
5843 return ik;
5844 }
5845
5846 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5847 assert(ik != NULL, "invariant");
5848
5849 // Set name and CLD before adding to CLD
5850 ik->set_class_loader_data(_loader_data);
5851 ik->set_name(_class_name);
5852
5853 // Add all classes to our internal class loader list here,
5854 // including classes in the bootstrap (NULL) class loader.
5855 const bool publicize = !is_internal();
5856
5857 _loader_data->add_class(ik, publicize);
5858
5859 set_klass_to_deallocate(ik);
5860
5861 assert(_field_info != NULL, "invariant");
5862 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5863 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->nonstatic_oop_map_count,
5864 "sanity");
5865
5866 assert(ik->is_instance_klass(), "sanity");
5867 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5868
5869 // Fill in information already parsed
5870 ik->set_should_verify_class(_need_verify);
5871
5872 // Not yet: supers are done below to support the new subtype-checking fields
5873 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5874 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5875 assert(_fac != NULL, "invariant");
5876 ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_FLATTENABLE]);
5877
5878 // this transfers ownership of a lot of arrays from
5879 // the parser onto the InstanceKlass*
5880 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5881
5882 // note that is not safe to use the fields in the parser from this point on
5883 assert(NULL == _cp, "invariant");
5884 assert(NULL == _fields, "invariant");
5885 assert(NULL == _methods, "invariant");
5886 assert(NULL == _inner_classes, "invariant");
5887 assert(NULL == _nest_members, "invariant");
5888 assert(NULL == _local_interfaces, "invariant");
5889 assert(NULL == _combined_annotations, "invariant");
5890
5891 if (_has_final_method) {
5892 ik->set_has_final_method();
5893 }
5894
5895 ik->copy_method_ordering(_method_ordering, CHECK);
5896 // The InstanceKlass::_methods_jmethod_ids cache
5897 // is managed on the assumption that the initial cache
5898 // size is equal to the number of methods in the class. If
5899 // that changes, then InstanceKlass::idnum_can_increment()
5900 // has to be changed accordingly.
5901 ik->set_initial_method_idnum(ik->methods()->length());
5902
5903 ik->set_this_class_index(_this_class_index);
5904
5905 if (is_unsafe_anonymous()) {
5906 // _this_class_index is a CONSTANT_Class entry that refers to this
5907 // anonymous class itself. If this class needs to refer to its own methods or
5908 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5909 // _this_class_index. However, because this class is anonymous (it's
5910 // not stored in SystemDictionary), _this_class_index cannot be resolved
5911 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5912 // Therefore, we must eagerly resolve _this_class_index now.
5913 ik->constants()->klass_at_put(_this_class_index, ik);
5914 }
5915
5916 ik->set_minor_version(_minor_version);
5917 ik->set_major_version(_major_version);
5918 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5919 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5920
5921 if (_unsafe_anonymous_host != NULL) {
5922 assert (ik->is_unsafe_anonymous(), "should be the same");
5923 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host);
5924 }
5925
5926 // Set PackageEntry for this_klass
5927 oop cl = ik->class_loader();
5928 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5929 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5930 ik->set_package(cld, CHECK);
5931
5932 const Array<Method*>* const methods = ik->methods();
5933 assert(methods != NULL, "invariant");
5934 const int methods_len = methods->length();
5935
5936 check_methods_for_intrinsics(ik, methods);
5937
5938 // Fill in field values obtained by parse_classfile_attributes
5939 if (_parsed_annotations->has_any_annotations()) {
5940 _parsed_annotations->apply_to(ik);
5941 }
5942
5943 apply_parsed_class_attributes(ik);
5944
5945 // Miranda methods
5946 if ((_num_miranda_methods > 0) ||
5947 // if this class introduced new miranda methods or
5948 (_super_klass != NULL && _super_klass->has_miranda_methods())
5949 // super class exists and this class inherited miranda methods
5950 ) {
5951 ik->set_has_miranda_methods(); // then set a flag
5952 }
5953
5954 // Fill in information needed to compute superclasses.
5955 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5956 ik->set_transitive_interfaces(_transitive_interfaces);
5957 _transitive_interfaces = NULL;
5958
5959 // Initialize itable offset tables
5960 klassItable::setup_itable_offset_table(ik);
5961
5962 // Compute transitive closure of interfaces this class implements
5963 // Do final class setup
5964 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5965 if (oop_map_blocks->nonstatic_oop_map_count > 0) {
5966 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5967 }
5968
5969 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5970 set_precomputed_flags(ik, CHECK);
5971
5972 // check if this class can access its super class
5973 check_super_class_access(ik, CHECK);
5974
5975 // check if this class can access its superinterfaces
5976 check_super_interface_access(ik, CHECK);
5977
5978 // check if this class overrides any final method
5979 check_final_method_override(ik, CHECK);
5980
5981 // reject static interface methods prior to Java 8
5982 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5983 check_illegal_static_method(ik, CHECK);
5984 }
5985
5986 // Obtain this_klass' module entry
5987 ModuleEntry* module_entry = ik->module();
5988 assert(module_entry != NULL, "module_entry should always be set");
5989
5990 // Obtain java.lang.Module
5991 Handle module_handle(THREAD, module_entry->module());
5992
5993 // Allocate mirror and initialize static fields
5994 // The create_mirror() call will also call compute_modifiers()
5995 java_lang_Class::create_mirror(ik,
5996 Handle(THREAD, _loader_data->class_loader()),
5997 module_handle,
5998 _protection_domain,
5999 CHECK);
6000
6001 assert(_all_mirandas != NULL, "invariant");
6002
6003 // Generate any default methods - default methods are public interface methods
6004 // that have a default implementation. This is new with Java 8.
6005 if (_has_nonstatic_concrete_methods) {
6006 DefaultMethods::generate_default_methods(ik,
6007 _all_mirandas,
6008 CHECK);
6009 }
6010
6011 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
6012 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
6013 !module_entry->has_default_read_edges()) {
6014 if (!module_entry->set_has_default_read_edges()) {
6015 // We won a potential race
6016 JvmtiExport::add_default_read_edges(module_handle, THREAD);
6017 }
6018 }
6019
6020 int nfields = ik->java_fields_count();
6021 if (ik->is_value()) nfields++;
6022 for (int i = 0; i < nfields; i++) {
6023 if (ik->field_access_flags(i) & JVM_ACC_FLATTENABLE) {
6024 Symbol* klass_name = ik->field_signature(i)->fundamental_name(CHECK);
6025 // Value classes must have been pre-loaded
6026 Klass* klass = SystemDictionary::find(klass_name,
6027 Handle(THREAD, ik->class_loader()),
6028 Handle(THREAD, ik->protection_domain()), CHECK);
6029 assert(klass != NULL, "Sanity check");
6030 assert(klass->access_flags().is_value_type(), "Value type expected");
6031 ik->set_value_field_klass(i, klass);
6032 klass_name->decrement_refcount();
6033 } else if (is_value_type() && ((ik->field_access_flags(i) & JVM_ACC_FIELD_INTERNAL) != 0)
6034 && ((ik->field_access_flags(i) & JVM_ACC_STATIC) != 0)) {
6035 ValueKlass::cast(ik)->set_default_value_offset(ik->field_offset(i));
6036 }
6037 }
6038
6039 if (is_value_type()) {
6040 ValueKlass::cast(ik)->initialize_calling_convention(CHECK);
6041 }
6042
6043 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
6044
6045 if (!is_internal()) {
6046 if (log_is_enabled(Info, class, load)) {
6047 ResourceMark rm;
6048 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
6049 ik->print_class_load_logging(_loader_data, module_name, _stream);
6050 }
6051
6052 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
6053 ik->major_version() != JAVA_MIN_SUPPORTED_VERSION &&
6054 log_is_enabled(Info, class, preview)) {
6055 ResourceMark rm;
6056 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
6057 ik->external_name(), ik->major_version());
6058 }
6059
6060 if (log_is_enabled(Debug, class, resolve)) {
6061 ResourceMark rm;
6062 // print out the superclass.
6063 const char * from = ik->external_name();
6064 if (ik->java_super() != NULL) {
6065 log_debug(class, resolve)("%s %s (super)",
6066 from,
6067 ik->java_super()->external_name());
6068 }
6069 // print out each of the interface classes referred to by this class.
6070 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
6071 if (local_interfaces != NULL) {
6072 const int length = local_interfaces->length();
6073 for (int i = 0; i < length; i++) {
6074 const InstanceKlass* const k = local_interfaces->at(i);
6075 const char * to = k->external_name();
6076 log_debug(class, resolve)("%s %s (interface)", from, to);
6077 }
6078 }
6079 }
6080 }
6081
6082 JFR_ONLY(INIT_ID(ik);)
6083
6084 // If we reach here, all is well.
6085 // Now remove the InstanceKlass* from the _klass_to_deallocate field
6086 // in order for it to not be destroyed in the ClassFileParser destructor.
6087 set_klass_to_deallocate(NULL);
6088
6089 // it's official
6090 set_klass(ik);
6091
6092 debug_only(ik->verify();)
6093 }
6094
6095 void ClassFileParser::update_class_name(Symbol* new_class_name) {
6096 // Decrement the refcount in the old name, since we're clobbering it.
6097 _class_name->decrement_refcount();
6098
6099 _class_name = new_class_name;
6100 // Increment the refcount of the new name.
6101 // Now the ClassFileParser owns this name and will decrement in
6102 // the destructor.
6103 _class_name->increment_refcount();
6104 }
6105
6106
6107 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's
6108 // package by prepending its host class's package name to its class name and setting
6109 // its _class_name field.
6110 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) {
6111 ResourceMark rm(THREAD);
6112 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
6113 "Unsafe anonymous class should not be in a package");
6114 const char* host_pkg_name =
6115 ClassLoader::package_from_name(unsafe_anonymous_host->name()->as_C_string(), NULL);
6116
6117 if (host_pkg_name != NULL) {
6118 int host_pkg_len = (int)strlen(host_pkg_name);
6119 int class_name_len = _class_name->utf8_length();
6120 int symbol_len = host_pkg_len + 1 + class_name_len;
6121 char* new_anon_name = NEW_RESOURCE_ARRAY(char, symbol_len + 1);
6122 int n = os::snprintf(new_anon_name, symbol_len + 1, "%s/%.*s",
6123 host_pkg_name, class_name_len, _class_name->base());
6124 assert(n == symbol_len, "Unexpected number of characters in string");
6125
6126 // Decrement old _class_name to avoid leaking.
6127 _class_name->decrement_refcount();
6128
6129 // Create a symbol and update the anonymous class name.
6130 // The new class name is created with a refcount of one. When installed into the InstanceKlass,
6131 // it'll be two and when the ClassFileParser destructor runs, it'll go back to one and get deleted
6132 // when the class is unloaded.
6133 _class_name = SymbolTable::new_symbol(new_anon_name, symbol_len, CHECK);
6134 }
6135 }
6136
6137 // If the host class and the anonymous class are in the same package then do
6138 // nothing. If the anonymous class is in the unnamed package then move it to its
6139 // host's package. If the classes are in different packages then throw an IAE
6140 // exception.
6141 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) {
6142 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class");
6143
6144 const jbyte* anon_last_slash = UTF8::strrchr((const jbyte*)_class_name->base(),
6145 _class_name->utf8_length(), '/');
6146 if (anon_last_slash == NULL) { // Unnamed package
6147 prepend_host_package_name(_unsafe_anonymous_host, CHECK);
6148 } else {
6149 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) {
6150 ResourceMark rm(THREAD);
6151 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
6152 err_msg("Host class %s and anonymous class %s are in different packages",
6153 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string()));
6154 }
6155 }
6156 }
6157
6158 static bool relax_format_check_for(ClassLoaderData* loader_data) {
6159 bool trusted = (loader_data->is_the_null_class_loader_data() ||
6160 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
6161 bool need_verify =
6162 // verifyAll
6163 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
6164 // verifyRemote
6165 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
6166 return !need_verify;
6167 }
6168
6169 ClassFileParser::ClassFileParser(ClassFileStream* stream,
6170 Symbol* name,
6171 ClassLoaderData* loader_data,
6172 Handle protection_domain,
6173 const InstanceKlass* unsafe_anonymous_host,
6174 GrowableArray<Handle>* cp_patches,
6175 Publicity pub_level,
6176 TRAPS) :
6177 _stream(stream),
6178 _requested_name(name),
6179 _class_name(NULL),
6180 _loader_data(loader_data),
6181 _unsafe_anonymous_host(unsafe_anonymous_host),
6182 _cp_patches(cp_patches),
6183 _num_patched_klasses(0),
6184 _max_num_patched_klasses(0),
6185 _orig_cp_size(0),
6186 _first_patched_klass_resolved_index(0),
6187 _super_klass(),
6188 _cp(NULL),
6189 _fields(NULL),
6190 _methods(NULL),
6191 _inner_classes(NULL),
6192 _nest_members(NULL),
6193 _nest_host(0),
6194 _local_interfaces(NULL),
6195 _transitive_interfaces(NULL),
6196 _combined_annotations(NULL),
6197 _annotations(NULL),
6198 _type_annotations(NULL),
6199 _fields_annotations(NULL),
6200 _fields_type_annotations(NULL),
6201 _klass(NULL),
6202 _klass_to_deallocate(NULL),
6203 _parsed_annotations(NULL),
6204 _fac(NULL),
6205 _field_info(NULL),
6206 _method_ordering(NULL),
6207 _all_mirandas(NULL),
6208 _vtable_size(0),
6209 _itable_size(0),
6210 _num_miranda_methods(0),
6211 _rt(REF_NONE),
6212 _protection_domain(protection_domain),
6213 _access_flags(),
6214 _pub_level(pub_level),
6215 _bad_constant_seen(0),
6216 _synthetic_flag(false),
6217 _sde_length(false),
6218 _sde_buffer(NULL),
6219 _sourcefile_index(0),
6220 _generic_signature_index(0),
6221 _major_version(0),
6222 _minor_version(0),
6223 _this_class_index(0),
6224 _super_class_index(0),
6225 _itfs_len(0),
6226 _java_fields_count(0),
6227 _need_verify(false),
6228 _relax_verify(false),
6229 _has_nonstatic_concrete_methods(false),
6230 _declares_nonstatic_concrete_methods(false),
6231 _has_final_method(false),
6232 _has_flattenable_fields(false),
6233 _has_finalizer(false),
6234 _has_empty_finalizer(false),
6235 _has_vanilla_constructor(false),
6236 _max_bootstrap_specifier_index(-1) {
6237
6238 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6239 _class_name->increment_refcount();
6240
6241 assert(THREAD->is_Java_thread(), "invariant");
6242 assert(_loader_data != NULL, "invariant");
6243 assert(stream != NULL, "invariant");
6244 assert(_stream != NULL, "invariant");
6245 assert(_stream->buffer() == _stream->current(), "invariant");
6246 assert(_class_name != NULL, "invariant");
6247 assert(0 == _access_flags.as_int(), "invariant");
6248
6249 // Figure out whether we can skip format checking (matching classic VM behavior)
6250 if (DumpSharedSpaces) {
6251 // verify == true means it's a 'remote' class (i.e., non-boot class)
6252 // Verification decision is based on BytecodeVerificationRemote flag
6253 // for those classes.
6254 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
6255 BytecodeVerificationLocal;
6256 }
6257 else {
6258 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
6259 stream->need_verify());
6260 }
6261 if (_cp_patches != NULL) {
6262 int len = _cp_patches->length();
6263 for (int i=0; i<len; i++) {
6264 if (has_cp_patch_at(i)) {
6265 Handle patch = cp_patch_at(i);
6266 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
6267 // We need to append the names of the patched classes to the end of the constant pool,
6268 // because a patched class may have a Utf8 name that's not already included in the
6269 // original constant pool. These class names are used when patch_constant_pool()
6270 // calls patch_class().
6271 //
6272 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
6273 // At this point, we don't know the tag for index i yet, because we haven't parsed the
6274 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
6275 _max_num_patched_klasses++;
6276 }
6277 }
6278 }
6279 }
6280
6281 // synch back verification state to stream
6282 stream->set_verify(_need_verify);
6283
6284 // Check if verification needs to be relaxed for this class file
6285 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
6286 _relax_verify = relax_format_check_for(_loader_data);
6287
6288 parse_stream(stream, CHECK);
6289
6290 post_process_parsed_stream(stream, _cp, CHECK);
6291 }
6292
6293 void ClassFileParser::clear_class_metadata() {
6294 // metadata created before the instance klass is created. Must be
6295 // deallocated if classfile parsing returns an error.
6296 _cp = NULL;
6297 _fields = NULL;
6298 _methods = NULL;
6299 _inner_classes = NULL;
6300 _nest_members = NULL;
6301 _local_interfaces = NULL;
6302 _combined_annotations = NULL;
6303 _annotations = _type_annotations = NULL;
6304 _fields_annotations = _fields_type_annotations = NULL;
6305 }
6306
6307 // Destructor to clean up
6308 ClassFileParser::~ClassFileParser() {
6309 _class_name->decrement_refcount();
6310
6311 if (_cp != NULL) {
6312 MetadataFactory::free_metadata(_loader_data, _cp);
6313 }
6314 if (_fields != NULL) {
6315 MetadataFactory::free_array<u2>(_loader_data, _fields);
6316 }
6317
6318 if (_methods != NULL) {
6319 // Free methods
6320 InstanceKlass::deallocate_methods(_loader_data, _methods);
6321 }
6322
6323 // beware of the Universe::empty_blah_array!!
6324 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6325 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6326 }
6327
6328 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
6329 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6330 }
6331
6332 // Free interfaces
6333 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6334 _local_interfaces, _transitive_interfaces);
6335
6336 if (_combined_annotations != NULL) {
6337 // After all annotations arrays have been created, they are installed into the
6338 // Annotations object that will be assigned to the InstanceKlass being created.
6339
6340 // Deallocate the Annotations object and the installed annotations arrays.
6341 _combined_annotations->deallocate_contents(_loader_data);
6342
6343 // If the _combined_annotations pointer is non-NULL,
6344 // then the other annotations fields should have been cleared.
6345 assert(_annotations == NULL, "Should have been cleared");
6346 assert(_type_annotations == NULL, "Should have been cleared");
6347 assert(_fields_annotations == NULL, "Should have been cleared");
6348 assert(_fields_type_annotations == NULL, "Should have been cleared");
6349 } else {
6350 // If the annotations arrays were not installed into the Annotations object,
6351 // then they have to be deallocated explicitly.
6352 MetadataFactory::free_array<u1>(_loader_data, _annotations);
6353 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
6354 Annotations::free_contents(_loader_data, _fields_annotations);
6355 Annotations::free_contents(_loader_data, _fields_type_annotations);
6356 }
6357
6358 clear_class_metadata();
6359 _transitive_interfaces = NULL;
6360
6361 // deallocate the klass if already created. Don't directly deallocate, but add
6362 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6363 // at a safepoint.
6364 if (_klass_to_deallocate != NULL) {
6365 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6366 }
6367 }
6368
6369 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6370 TRAPS) {
6371
6372 assert(stream != NULL, "invariant");
6373 assert(_class_name != NULL, "invariant");
6374
6375 // BEGIN STREAM PARSING
6376 stream->guarantee_more(8, CHECK); // magic, major, minor
6377 // Magic value
6378 const u4 magic = stream->get_u4_fast();
6379 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6380 "Incompatible magic value %u in class file %s",
6381 magic, CHECK);
6382
6383 // Version numbers
6384 _minor_version = stream->get_u2_fast();
6385 _major_version = stream->get_u2_fast();
6386
6387 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) {
6388 ResourceMark rm;
6389 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
6390 _major_version, _minor_version, _class_name->as_C_string());
6391 Exceptions::fthrow(
6392 THREAD_AND_LOCATION,
6393 vmSymbols::java_lang_UnsupportedClassVersionError(),
6394 "Unsupported major.minor version for dump time %u.%u",
6395 _major_version,
6396 _minor_version);
6397 }
6398
6399 // Check version numbers - we check this even with verifier off
6400 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6401
6402 stream->guarantee_more(3, CHECK); // length, first cp tag
6403 u2 cp_size = stream->get_u2_fast();
6404
6405 guarantee_property(
6406 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6407 cp_size, CHECK);
6408
6409 _orig_cp_size = cp_size;
6410 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6411 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6412 }
6413 cp_size += _max_num_patched_klasses;
6414
6415 _cp = ConstantPool::allocate(_loader_data,
6416 cp_size,
6417 CHECK);
6418
6419 ConstantPool* const cp = _cp;
6420
6421 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6422
6423 assert(cp_size == (const u2)cp->length(), "invariant");
6424
6425 // ACCESS FLAGS
6426 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6427
6428 jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
6429 // JVM_ACC_MODULE is defined in JDK-9 and later.
6430 if (_major_version >= JAVA_9_VERSION) {
6431 recognized_modifiers |= JVM_ACC_MODULE;
6432 }
6433 // JVM_ACC_VALUE is defined for class file version 55 and later
6434 if (supports_value_types()) {
6435 recognized_modifiers |= JVM_ACC_VALUE;
6436 }
6437
6438 // Access flags
6439 jint flags = stream->get_u2_fast() & recognized_modifiers;
6440
6441 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6442 // Set abstract bit for old class files for backward compatibility
6443 flags |= JVM_ACC_ABSTRACT;
6444 }
6445
6446 verify_legal_class_modifiers(flags, CHECK);
6447
6448 short bad_constant = class_bad_constant_seen();
6449 if (bad_constant != 0) {
6450 // Do not throw CFE until after the access_flags are checked because if
6451 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6452 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6453 }
6454
6455 _access_flags.set_flags(flags);
6456
6457 // This class and superclass
6458 _this_class_index = stream->get_u2_fast();
6459 check_property(
6460 valid_cp_range(_this_class_index, cp_size) &&
6461 cp->tag_at(_this_class_index).is_unresolved_klass(),
6462 "Invalid this class index %u in constant pool in class file %s",
6463 _this_class_index, CHECK);
6464
6465 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6466 assert(class_name_in_cp != NULL, "class_name can't be null");
6467
6468 // Update _class_name to reflect the name in the constant pool
6469 update_class_name(class_name_in_cp);
6470
6471 // Don't need to check whether this class name is legal or not.
6472 // It has been checked when constant pool is parsed.
6473 // However, make sure it is not an array type.
6474 if (_need_verify) {
6475 guarantee_property(_class_name->char_at(0) != JVM_SIGNATURE_ARRAY,
6476 "Bad class name in class file %s",
6477 CHECK);
6478 }
6479
6480 // Checks if name in class file matches requested name
6481 if (_requested_name != NULL && _requested_name != _class_name) {
6482 ResourceMark rm(THREAD);
6483 Exceptions::fthrow(
6484 THREAD_AND_LOCATION,
6485 vmSymbols::java_lang_NoClassDefFoundError(),
6486 "%s (wrong name: %s)",
6487 _class_name->as_C_string(),
6488 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6489 );
6490 return;
6491 }
6492
6493 // if this is an anonymous class fix up its name if it's in the unnamed
6494 // package. Otherwise, throw IAE if it is in a different package than
6495 // its host class.
6496 if (_unsafe_anonymous_host != NULL) {
6497 fix_unsafe_anonymous_class_name(CHECK);
6498 }
6499
6500 // Verification prevents us from creating names with dots in them, this
6501 // asserts that that's the case.
6502 assert(is_internal_format(_class_name), "external class name format used internally");
6503
6504 if (!is_internal()) {
6505 LogTarget(Debug, class, preorder) lt;
6506 if (lt.is_enabled()){
6507 ResourceMark rm(THREAD);
6508 LogStream ls(lt);
6509 ls.print("%s", _class_name->as_klass_external_name());
6510 if (stream->source() != NULL) {
6511 ls.print(" source: %s", stream->source());
6512 }
6513 ls.cr();
6514 }
6515
6516 #if INCLUDE_CDS
6517 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6518 if (!ClassLoader::has_jrt_entry()) {
6519 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6520 DumpLoadedClassList = NULL;
6521 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6522 _unsafe_anonymous_host == NULL) {
6523 // Only dump the classes that can be stored into CDS archive.
6524 // Unsafe anonymous classes such as generated LambdaForm classes are also not included.
6525 oop class_loader = _loader_data->class_loader();
6526 ResourceMark rm(THREAD);
6527 bool skip = false;
6528 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6529 // For the boot and platform class loaders, skip classes that are not found in the
6530 // java runtime image, such as those found in the --patch-module entries.
6531 // These classes can't be loaded from the archive during runtime.
6532 if (!stream->from_boot_loader_modules_image() && strncmp(stream->source(), "jrt:", 4) != 0) {
6533 skip = true;
6534 }
6535
6536 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6537 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6538 // as they can be loaded from the archive during runtime.
6539 skip = false;
6540 }
6541 }
6542 if (skip) {
6543 tty->print_cr("skip writing class %s from source %s to classlist file",
6544 _class_name->as_C_string(), stream->source());
6545 } else {
6546 classlist_file->print_cr("%s", _class_name->as_C_string());
6547 classlist_file->flush();
6548 }
6549 }
6550 }
6551 #endif
6552 }
6553
6554 // SUPERKLASS
6555 _super_class_index = stream->get_u2_fast();
6556 _super_klass = parse_super_class(cp,
6557 _super_class_index,
6558 _need_verify,
6559 CHECK);
6560
6561 // Interfaces
6562 _itfs_len = stream->get_u2_fast();
6563 parse_interfaces(stream,
6564 _itfs_len,
6565 cp,
6566 &_has_nonstatic_concrete_methods,
6567 CHECK);
6568
6569 assert(_local_interfaces != NULL, "invariant");
6570
6571 // Fields (offsets are filled in later)
6572 _fac = new FieldAllocationCount();
6573 parse_fields(stream,
6574 _access_flags.is_interface(),
6575 _access_flags.is_value_type(),
6576 _fac,
6577 cp,
6578 cp_size,
6579 &_java_fields_count,
6580 CHECK);
6581
6582 assert(_fields != NULL, "invariant");
6583
6584 // Methods
6585 AccessFlags promoted_flags;
6586 parse_methods(stream,
6587 _access_flags.is_interface(),
6588 _access_flags.is_value_type(),
6589 &promoted_flags,
6590 &_has_final_method,
6591 &_declares_nonstatic_concrete_methods,
6592 CHECK);
6593
6594 assert(_methods != NULL, "invariant");
6595
6596 // promote flags from parse_methods() to the klass' flags
6597 _access_flags.add_promoted_flags(promoted_flags.as_int());
6598
6599 if (_declares_nonstatic_concrete_methods) {
6600 _has_nonstatic_concrete_methods = true;
6601 }
6602
6603 // Additional attributes/annotations
6604 _parsed_annotations = new ClassAnnotationCollector();
6605 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6606
6607 assert(_inner_classes != NULL, "invariant");
6608
6609 // Finalize the Annotations metadata object,
6610 // now that all annotation arrays have been created.
6611 create_combined_annotations(CHECK);
6612
6613 // Make sure this is the end of class file stream
6614 guarantee_property(stream->at_eos(),
6615 "Extra bytes at the end of class file %s",
6616 CHECK);
6617
6618 // all bytes in stream read and parsed
6619 }
6620
6621 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6622 ConstantPool* cp,
6623 TRAPS) {
6624 assert(stream != NULL, "invariant");
6625 assert(stream->at_eos(), "invariant");
6626 assert(cp != NULL, "invariant");
6627 assert(_loader_data != NULL, "invariant");
6628
6629 if (_class_name == vmSymbols::java_lang_Object()) {
6630 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6631 "java.lang.Object cannot implement an interface in class file %s",
6632 CHECK);
6633 }
6634 // We check super class after class file is parsed and format is checked
6635 if (_super_class_index > 0 && NULL ==_super_klass) {
6636 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6637 if (_access_flags.is_interface()) {
6638 // Before attempting to resolve the superclass, check for class format
6639 // errors not checked yet.
6640 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6641 "Interfaces must have java.lang.Object as superclass in class file %s",
6642 CHECK);
6643 }
6644 Handle loader(THREAD, _loader_data->class_loader());
6645 _super_klass = (const InstanceKlass*)
6646 SystemDictionary::resolve_super_or_fail(_class_name,
6647 super_class_name,
6648 loader,
6649 _protection_domain,
6650 true,
6651 CHECK);
6652 }
6653
6654 if (_super_klass != NULL) {
6655 if (_super_klass->has_nonstatic_concrete_methods()) {
6656 _has_nonstatic_concrete_methods = true;
6657 }
6658
6659 if (_super_klass->is_interface()) {
6660 ResourceMark rm(THREAD);
6661 Exceptions::fthrow(
6662 THREAD_AND_LOCATION,
6663 vmSymbols::java_lang_IncompatibleClassChangeError(),
6664 "class %s has interface %s as super class",
6665 _class_name->as_klass_external_name(),
6666 _super_klass->external_name()
6667 );
6668 return;
6669 }
6670
6671 // For a value class, only java/lang/Object is an acceptable super class
6672 if (_access_flags.get_flags() & JVM_ACC_VALUE) {
6673 guarantee_property(_super_klass->name() == vmSymbols::java_lang_Object(),
6674 "Value type must have java.lang.Object as superclass in class file %s",
6675 CHECK);
6676 }
6677
6678 // Make sure super class is not final
6679 if (_super_klass->is_final()) {
6680 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6681 }
6682 }
6683
6684 // Compute the transitive list of all unique interfaces implemented by this class
6685 _transitive_interfaces =
6686 compute_transitive_interfaces(_super_klass,
6687 _local_interfaces,
6688 _loader_data,
6689 CHECK);
6690
6691 assert(_transitive_interfaces != NULL, "invariant");
6692
6693 // sort methods
6694 _method_ordering = sort_methods(_methods);
6695
6696 _all_mirandas = new GrowableArray<Method*>(20);
6697
6698 Handle loader(THREAD, _loader_data->class_loader());
6699 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6700 &_num_miranda_methods,
6701 _all_mirandas,
6702 _super_klass,
6703 _methods,
6704 _access_flags,
6705 _major_version,
6706 loader,
6707 _class_name,
6708 _local_interfaces,
6709 CHECK);
6710
6711 // Size of Java itable (in words)
6712 _itable_size = _access_flags.is_interface() ? 0 :
6713 klassItable::compute_itable_size(_transitive_interfaces);
6714
6715 assert(_fac != NULL, "invariant");
6716 assert(_parsed_annotations != NULL, "invariant");
6717
6718
6719 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
6720 if (fs.is_flattenable()) {
6721 // Pre-load value class
6722 Klass* klass = SystemDictionary::resolve_flattenable_field_or_fail(&fs,
6723 Handle(THREAD, _loader_data->class_loader()),
6724 _protection_domain, true, CHECK);
6725 assert(klass != NULL, "Sanity check");
6726 assert(klass->access_flags().is_value_type(), "Value type expected");
6727 _has_flattenable_fields = true;
6728 }
6729 }
6730
6731 _field_info = new FieldLayoutInfo();
6732 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6733
6734 // Compute reference typ
6735 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6736
6737 }
6738
6739 void ClassFileParser::set_klass(InstanceKlass* klass) {
6740
6741 #ifdef ASSERT
6742 if (klass != NULL) {
6743 assert(NULL == _klass, "leaking?");
6744 }
6745 #endif
6746
6747 _klass = klass;
6748 }
6749
6750 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6751
6752 #ifdef ASSERT
6753 if (klass != NULL) {
6754 assert(NULL == _klass_to_deallocate, "leaking?");
6755 }
6756 #endif
6757
6758 _klass_to_deallocate = klass;
6759 }
6760
6761 // Caller responsible for ResourceMark
6762 // clone stream with rewound position
6763 const ClassFileStream* ClassFileParser::clone_stream() const {
6764 assert(_stream != NULL, "invariant");
6765
6766 return _stream->clone();
6767 }
6768
6769 // ----------------------------------------------------------------------------
6770 // debugging
6771
6772 #ifdef ASSERT
6773
6774 // return true if class_name contains no '.' (internal format is '/')
6775 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6776 if (class_name != NULL) {
6777 ResourceMark rm;
6778 char* name = class_name->as_C_string();
6779 return strchr(name, '.') == NULL;
6780 } else {
6781 return true;
6782 }
6783 }
6784
6785 #endif