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