1 /*
2 * Copyright (c) 1997, 2020, 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/fieldLayoutBuilder.hpp"
34 #include "classfile/javaClasses.inline.hpp"
35 #include "classfile/moduleEntry.hpp"
36 #include "classfile/packageEntry.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/verificationType.hpp"
40 #include "classfile/verifier.hpp"
41 #include "classfile/vmSymbols.hpp"
42 #include "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "memory/allocation.hpp"
45 #include "memory/metadataFactory.hpp"
46 #include "memory/oopFactory.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "oops/annotations.hpp"
50 #include "oops/constantPool.inline.hpp"
51 #include "oops/fieldStreams.inline.hpp"
52 #include "oops/instanceKlass.hpp"
53 #include "oops/instanceMirrorKlass.hpp"
54 #include "oops/klass.inline.hpp"
55 #include "oops/klassVtable.hpp"
56 #include "oops/metadata.hpp"
57 #include "oops/method.inline.hpp"
58 #include "oops/oop.inline.hpp"
59 #include "oops/recordComponent.hpp"
60 #include "oops/symbol.hpp"
61 #include "prims/jvmtiExport.hpp"
62 #include "prims/jvmtiThreadState.hpp"
63 #include "runtime/arguments.hpp"
64 #include "runtime/fieldDescriptor.inline.hpp"
65 #include "runtime/handles.inline.hpp"
66 #include "runtime/javaCalls.hpp"
67 #include "runtime/os.hpp"
68 #include "runtime/perfData.hpp"
69 #include "runtime/reflection.hpp"
70 #include "runtime/safepointVerifiers.hpp"
71 #include "runtime/signature.hpp"
72 #include "runtime/timer.hpp"
73 #include "services/classLoadingService.hpp"
74 #include "services/threadService.hpp"
75 #include "utilities/align.hpp"
76 #include "utilities/bitMap.inline.hpp"
77 #include "utilities/copy.hpp"
78 #include "utilities/exceptions.hpp"
79 #include "utilities/globalDefinitions.hpp"
80 #include "utilities/growableArray.hpp"
81 #include "utilities/macros.hpp"
82 #include "utilities/ostream.hpp"
83 #include "utilities/resourceHash.hpp"
84 #include "utilities/utf8.hpp"
85
86 #if INCLUDE_CDS
87 #include "classfile/systemDictionaryShared.hpp"
88 #endif
89 #if INCLUDE_JFR
90 #include "jfr/support/jfrTraceIdExtension.hpp"
91 #endif
92
93 // We generally try to create the oops directly when parsing, rather than
94 // allocating temporary data structures and copying the bytes twice. A
95 // temporary area is only needed when parsing utf8 entries in the constant
96 // pool and when parsing line number tables.
97
98 // We add assert in debug mode when class format is not checked.
99
100 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
101 #define JAVA_MIN_SUPPORTED_VERSION 45
102 #define JAVA_PREVIEW_MINOR_VERSION 65535
103
104 // Used for two backward compatibility reasons:
105 // - to check for new additions to the class file format in JDK1.5
106 // - to check for bug fixes in the format checker in JDK1.5
107 #define JAVA_1_5_VERSION 49
108
109 // Used for backward compatibility reasons:
110 // - to check for javac bug fixes that happened after 1.5
111 // - also used as the max version when running in jdk6
112 #define JAVA_6_VERSION 50
113
114 // Used for backward compatibility reasons:
115 // - to disallow argument and require ACC_STATIC for <clinit> methods
116 #define JAVA_7_VERSION 51
117
118 // Extension method support.
119 #define JAVA_8_VERSION 52
120
121 #define JAVA_9_VERSION 53
122
123 #define JAVA_10_VERSION 54
124
125 #define JAVA_11_VERSION 55
126
127 #define JAVA_12_VERSION 56
128
129 #define JAVA_13_VERSION 57
130
131 #define JAVA_14_VERSION 58
132
133 #define JAVA_15_VERSION 59
134
set_class_bad_constant_seen(short bad_constant)135 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
136 assert((bad_constant == JVM_CONSTANT_Module ||
137 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
138 "Unexpected bad constant pool entry");
139 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
140 }
141
parse_constant_pool_entries(const ClassFileStream * const stream,ConstantPool * cp,const int length,TRAPS)142 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
143 ConstantPool* cp,
144 const int length,
145 TRAPS) {
146 assert(stream != NULL, "invariant");
147 assert(cp != NULL, "invariant");
148
149 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
150 // this function (_current can be allocated in a register, with scalar
151 // replacement of aggregates). The _current pointer is copied back to
152 // stream() when this function returns. DON'T call another method within
153 // this method that uses stream().
154 const ClassFileStream cfs1 = *stream;
155 const ClassFileStream* const cfs = &cfs1;
156
157 assert(cfs->allocated_on_stack(), "should be local");
158 debug_only(const u1* const old_current = stream->current();)
159
160 // Used for batching symbol allocations.
161 const char* names[SymbolTable::symbol_alloc_batch_size];
162 int lengths[SymbolTable::symbol_alloc_batch_size];
163 int indices[SymbolTable::symbol_alloc_batch_size];
164 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
165 int names_count = 0;
166
167 // parsing Index 0 is unused
168 for (int index = 1; index < length; index++) {
169 // Each of the following case guarantees one more byte in the stream
170 // for the following tag or the access_flags following constant pool,
171 // so we don't need bounds-check for reading tag.
172 const u1 tag = cfs->get_u1_fast();
173 switch (tag) {
174 case JVM_CONSTANT_Class : {
175 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
176 const u2 name_index = cfs->get_u2_fast();
177 cp->klass_index_at_put(index, name_index);
178 break;
179 }
180 case JVM_CONSTANT_Fieldref: {
181 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
182 const u2 class_index = cfs->get_u2_fast();
183 const u2 name_and_type_index = cfs->get_u2_fast();
184 cp->field_at_put(index, class_index, name_and_type_index);
185 break;
186 }
187 case JVM_CONSTANT_Methodref: {
188 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
189 const u2 class_index = cfs->get_u2_fast();
190 const u2 name_and_type_index = cfs->get_u2_fast();
191 cp->method_at_put(index, class_index, name_and_type_index);
192 break;
193 }
194 case JVM_CONSTANT_InterfaceMethodref: {
195 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
196 const u2 class_index = cfs->get_u2_fast();
197 const u2 name_and_type_index = cfs->get_u2_fast();
198 cp->interface_method_at_put(index, class_index, name_and_type_index);
199 break;
200 }
201 case JVM_CONSTANT_String : {
202 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
203 const u2 string_index = cfs->get_u2_fast();
204 cp->string_index_at_put(index, string_index);
205 break;
206 }
207 case JVM_CONSTANT_MethodHandle :
208 case JVM_CONSTANT_MethodType: {
209 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
210 classfile_parse_error(
211 "Class file version does not support constant tag %u in class file %s",
212 tag, CHECK);
213 }
214 if (tag == JVM_CONSTANT_MethodHandle) {
215 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
216 const u1 ref_kind = cfs->get_u1_fast();
217 const u2 method_index = cfs->get_u2_fast();
218 cp->method_handle_index_at_put(index, ref_kind, method_index);
219 }
220 else if (tag == JVM_CONSTANT_MethodType) {
221 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
222 const u2 signature_index = cfs->get_u2_fast();
223 cp->method_type_index_at_put(index, signature_index);
224 }
225 else {
226 ShouldNotReachHere();
227 }
228 break;
229 }
230 case JVM_CONSTANT_Dynamic : {
231 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
232 classfile_parse_error(
233 "Class file version does not support constant tag %u in class file %s",
234 tag, CHECK);
235 }
236 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
237 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
238 const u2 name_and_type_index = cfs->get_u2_fast();
239 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
240 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
241 }
242 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
243 break;
244 }
245 case JVM_CONSTANT_InvokeDynamic : {
246 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
247 classfile_parse_error(
248 "Class file version does not support constant tag %u in class file %s",
249 tag, CHECK);
250 }
251 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
252 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
253 const u2 name_and_type_index = cfs->get_u2_fast();
254 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
255 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
256 }
257 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
258 break;
259 }
260 case JVM_CONSTANT_Integer: {
261 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
262 const u4 bytes = cfs->get_u4_fast();
263 cp->int_at_put(index, (jint)bytes);
264 break;
265 }
266 case JVM_CONSTANT_Float: {
267 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
268 const u4 bytes = cfs->get_u4_fast();
269 cp->float_at_put(index, *(jfloat*)&bytes);
270 break;
271 }
272 case JVM_CONSTANT_Long: {
273 // A mangled type might cause you to overrun allocated memory
274 guarantee_property(index + 1 < length,
275 "Invalid constant pool entry %u in class file %s",
276 index,
277 CHECK);
278 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
279 const u8 bytes = cfs->get_u8_fast();
280 cp->long_at_put(index, bytes);
281 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
282 break;
283 }
284 case JVM_CONSTANT_Double: {
285 // A mangled type might cause you to overrun allocated memory
286 guarantee_property(index+1 < length,
287 "Invalid constant pool entry %u in class file %s",
288 index,
289 CHECK);
290 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
291 const u8 bytes = cfs->get_u8_fast();
292 cp->double_at_put(index, *(jdouble*)&bytes);
293 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
294 break;
295 }
296 case JVM_CONSTANT_NameAndType: {
297 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
298 const u2 name_index = cfs->get_u2_fast();
299 const u2 signature_index = cfs->get_u2_fast();
300 cp->name_and_type_at_put(index, name_index, signature_index);
301 break;
302 }
303 case JVM_CONSTANT_Utf8 : {
304 cfs->guarantee_more(2, CHECK); // utf8_length
305 u2 utf8_length = cfs->get_u2_fast();
306 const u1* utf8_buffer = cfs->current();
307 assert(utf8_buffer != NULL, "null utf8 buffer");
308 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
309 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
310 cfs->skip_u1_fast(utf8_length);
311
312 // Before storing the symbol, make sure it's legal
313 if (_need_verify) {
314 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
315 }
316
317 if (has_cp_patch_at(index)) {
318 Handle patch = clear_cp_patch_at(index);
319 guarantee_property(java_lang_String::is_instance(patch()),
320 "Illegal utf8 patch at %d in class file %s",
321 index,
322 CHECK);
323 const char* const str = java_lang_String::as_utf8_string(patch());
324 // (could use java_lang_String::as_symbol instead, but might as well batch them)
325 utf8_buffer = (const u1*) str;
326 utf8_length = (u2) strlen(str);
327 }
328
329 unsigned int hash;
330 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
331 utf8_length,
332 hash);
333 if (result == NULL) {
334 names[names_count] = (const char*)utf8_buffer;
335 lengths[names_count] = utf8_length;
336 indices[names_count] = index;
337 hashValues[names_count++] = hash;
338 if (names_count == SymbolTable::symbol_alloc_batch_size) {
339 SymbolTable::new_symbols(_loader_data,
340 constantPoolHandle(THREAD, cp),
341 names_count,
342 names,
343 lengths,
344 indices,
345 hashValues);
346 names_count = 0;
347 }
348 } else {
349 cp->symbol_at_put(index, result);
350 }
351 break;
352 }
353 case JVM_CONSTANT_Module:
354 case JVM_CONSTANT_Package: {
355 // Record that an error occurred in these two cases but keep parsing so
356 // that ACC_Module can be checked for in the access_flags. Need to
357 // throw NoClassDefFoundError in that case.
358 if (_major_version >= JAVA_9_VERSION) {
359 cfs->guarantee_more(3, CHECK);
360 cfs->get_u2_fast();
361 set_class_bad_constant_seen(tag);
362 break;
363 }
364 }
365 default: {
366 classfile_parse_error("Unknown constant tag %u in class file %s",
367 tag,
368 CHECK);
369 break;
370 }
371 } // end of switch(tag)
372 } // end of for
373
374 // Allocate the remaining symbols
375 if (names_count > 0) {
376 SymbolTable::new_symbols(_loader_data,
377 constantPoolHandle(THREAD, cp),
378 names_count,
379 names,
380 lengths,
381 indices,
382 hashValues);
383 }
384
385 // Copy _current pointer of local copy back to stream.
386 assert(stream->current() == old_current, "non-exclusive use of stream");
387 stream->set_current(cfs1.current());
388
389 }
390
valid_cp_range(int index,int length)391 static inline bool valid_cp_range(int index, int length) {
392 return (index > 0 && index < length);
393 }
394
check_symbol_at(const ConstantPool * cp,int index)395 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
396 assert(cp != NULL, "invariant");
397 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
398 return cp->symbol_at(index);
399 }
400 return NULL;
401 }
402
403 #ifdef ASSERT
404 PRAGMA_DIAG_PUSH
405 PRAGMA_FORMAT_NONLITERAL_IGNORED
report_assert_property_failure(const char * msg,TRAPS) const406 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
407 ResourceMark rm(THREAD);
408 fatal(msg, _class_name->as_C_string());
409 }
410
report_assert_property_failure(const char * msg,int index,TRAPS) const411 void ClassFileParser::report_assert_property_failure(const char* msg,
412 int index,
413 TRAPS) const {
414 ResourceMark rm(THREAD);
415 fatal(msg, index, _class_name->as_C_string());
416 }
417 PRAGMA_DIAG_POP
418 #endif
419
parse_constant_pool(const ClassFileStream * const stream,ConstantPool * const cp,const int length,TRAPS)420 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
421 ConstantPool* const cp,
422 const int length,
423 TRAPS) {
424 assert(cp != NULL, "invariant");
425 assert(stream != NULL, "invariant");
426
427 // parsing constant pool entries
428 parse_constant_pool_entries(stream, cp, length, CHECK);
429 if (class_bad_constant_seen() != 0) {
430 // a bad CP entry has been detected previously so stop parsing and just return.
431 return;
432 }
433
434 int index = 1; // declared outside of loops for portability
435 int num_klasses = 0;
436
437 // first verification pass - validate cross references
438 // and fixup class and string constants
439 for (index = 1; index < length; index++) { // Index 0 is unused
440 const jbyte tag = cp->tag_at(index).value();
441 switch (tag) {
442 case JVM_CONSTANT_Class: {
443 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
444 break;
445 }
446 case JVM_CONSTANT_Fieldref:
447 // fall through
448 case JVM_CONSTANT_Methodref:
449 // fall through
450 case JVM_CONSTANT_InterfaceMethodref: {
451 if (!_need_verify) break;
452 const int klass_ref_index = cp->klass_ref_index_at(index);
453 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
454 check_property(valid_klass_reference_at(klass_ref_index),
455 "Invalid constant pool index %u in class file %s",
456 klass_ref_index, CHECK);
457 check_property(valid_cp_range(name_and_type_ref_index, length) &&
458 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
459 "Invalid constant pool index %u in class file %s",
460 name_and_type_ref_index, CHECK);
461 break;
462 }
463 case JVM_CONSTANT_String: {
464 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
465 break;
466 }
467 case JVM_CONSTANT_Integer:
468 break;
469 case JVM_CONSTANT_Float:
470 break;
471 case JVM_CONSTANT_Long:
472 case JVM_CONSTANT_Double: {
473 index++;
474 check_property(
475 (index < length && cp->tag_at(index).is_invalid()),
476 "Improper constant pool long/double index %u in class file %s",
477 index, CHECK);
478 break;
479 }
480 case JVM_CONSTANT_NameAndType: {
481 if (!_need_verify) break;
482 const int name_ref_index = cp->name_ref_index_at(index);
483 const int signature_ref_index = cp->signature_ref_index_at(index);
484 check_property(valid_symbol_at(name_ref_index),
485 "Invalid constant pool index %u in class file %s",
486 name_ref_index, CHECK);
487 check_property(valid_symbol_at(signature_ref_index),
488 "Invalid constant pool index %u in class file %s",
489 signature_ref_index, CHECK);
490 break;
491 }
492 case JVM_CONSTANT_Utf8:
493 break;
494 case JVM_CONSTANT_UnresolvedClass: // fall-through
495 case JVM_CONSTANT_UnresolvedClassInError: {
496 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
497 break;
498 }
499 case JVM_CONSTANT_ClassIndex: {
500 const int class_index = cp->klass_index_at(index);
501 check_property(valid_symbol_at(class_index),
502 "Invalid constant pool index %u in class file %s",
503 class_index, CHECK);
504 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
505 break;
506 }
507 case JVM_CONSTANT_StringIndex: {
508 const int string_index = cp->string_index_at(index);
509 check_property(valid_symbol_at(string_index),
510 "Invalid constant pool index %u in class file %s",
511 string_index, CHECK);
512 Symbol* const sym = cp->symbol_at(string_index);
513 cp->unresolved_string_at_put(index, sym);
514 break;
515 }
516 case JVM_CONSTANT_MethodHandle: {
517 const int ref_index = cp->method_handle_index_at(index);
518 check_property(valid_cp_range(ref_index, length),
519 "Invalid constant pool index %u in class file %s",
520 ref_index, CHECK);
521 const constantTag tag = cp->tag_at(ref_index);
522 const int ref_kind = cp->method_handle_ref_kind_at(index);
523
524 switch (ref_kind) {
525 case JVM_REF_getField:
526 case JVM_REF_getStatic:
527 case JVM_REF_putField:
528 case JVM_REF_putStatic: {
529 check_property(
530 tag.is_field(),
531 "Invalid constant pool index %u in class file %s (not a field)",
532 ref_index, CHECK);
533 break;
534 }
535 case JVM_REF_invokeVirtual:
536 case JVM_REF_newInvokeSpecial: {
537 check_property(
538 tag.is_method(),
539 "Invalid constant pool index %u in class file %s (not a method)",
540 ref_index, CHECK);
541 break;
542 }
543 case JVM_REF_invokeStatic:
544 case JVM_REF_invokeSpecial: {
545 check_property(
546 tag.is_method() ||
547 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
548 "Invalid constant pool index %u in class file %s (not a method)",
549 ref_index, CHECK);
550 break;
551 }
552 case JVM_REF_invokeInterface: {
553 check_property(
554 tag.is_interface_method(),
555 "Invalid constant pool index %u in class file %s (not an interface method)",
556 ref_index, CHECK);
557 break;
558 }
559 default: {
560 classfile_parse_error(
561 "Bad method handle kind at constant pool index %u in class file %s",
562 index, CHECK);
563 }
564 } // switch(refkind)
565 // Keep the ref_index unchanged. It will be indirected at link-time.
566 break;
567 } // case MethodHandle
568 case JVM_CONSTANT_MethodType: {
569 const int ref_index = cp->method_type_index_at(index);
570 check_property(valid_symbol_at(ref_index),
571 "Invalid constant pool index %u in class file %s",
572 ref_index, CHECK);
573 break;
574 }
575 case JVM_CONSTANT_Dynamic: {
576 const int name_and_type_ref_index =
577 cp->bootstrap_name_and_type_ref_index_at(index);
578
579 check_property(valid_cp_range(name_and_type_ref_index, length) &&
580 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
581 "Invalid constant pool index %u in class file %s",
582 name_and_type_ref_index, CHECK);
583 // bootstrap specifier index must be checked later,
584 // when BootstrapMethods attr is available
585
586 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
587 cp->set_has_dynamic_constant();
588 break;
589 }
590 case JVM_CONSTANT_InvokeDynamic: {
591 const int name_and_type_ref_index =
592 cp->bootstrap_name_and_type_ref_index_at(index);
593
594 check_property(valid_cp_range(name_and_type_ref_index, length) &&
595 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
596 "Invalid constant pool index %u in class file %s",
597 name_and_type_ref_index, CHECK);
598 // bootstrap specifier index must be checked later,
599 // when BootstrapMethods attr is available
600 break;
601 }
602 default: {
603 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
604 ShouldNotReachHere();
605 break;
606 }
607 } // switch(tag)
608 } // end of for
609
610 _first_patched_klass_resolved_index = num_klasses;
611 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
612
613 if (_cp_patches != NULL) {
614 // need to treat this_class specially...
615
616 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
617 // for now. These will be replaced with actual names of the patched classes in patch_class().
618 Symbol* s = vmSymbols::star_name();
619 for (int n=_orig_cp_size; n<cp->length(); n++) {
620 cp->symbol_at_put(n, s);
621 }
622
623 int this_class_index;
624 {
625 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
626 const u1* const mark = stream->current();
627 stream->skip_u2_fast(1); // skip flags
628 this_class_index = stream->get_u2_fast();
629 stream->set_current(mark); // revert to mark
630 }
631
632 for (index = 1; index < length; index++) { // Index 0 is unused
633 if (has_cp_patch_at(index)) {
634 guarantee_property(index != this_class_index,
635 "Illegal constant pool patch to self at %d in class file %s",
636 index, CHECK);
637 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
638 }
639 }
640 }
641
642 if (!_need_verify) {
643 return;
644 }
645
646 // second verification pass - checks the strings are of the right format.
647 // but not yet to the other entries
648 for (index = 1; index < length; index++) {
649 const jbyte tag = cp->tag_at(index).value();
650 switch (tag) {
651 case JVM_CONSTANT_UnresolvedClass: {
652 const Symbol* const class_name = cp->klass_name_at(index);
653 // check the name, even if _cp_patches will overwrite it
654 verify_legal_class_name(class_name, CHECK);
655 break;
656 }
657 case JVM_CONSTANT_NameAndType: {
658 if (_need_verify) {
659 const int sig_index = cp->signature_ref_index_at(index);
660 const int name_index = cp->name_ref_index_at(index);
661 const Symbol* const name = cp->symbol_at(name_index);
662 const Symbol* const sig = cp->symbol_at(sig_index);
663 guarantee_property(sig->utf8_length() != 0,
664 "Illegal zero length constant pool entry at %d in class %s",
665 sig_index, CHECK);
666 guarantee_property(name->utf8_length() != 0,
667 "Illegal zero length constant pool entry at %d in class %s",
668 name_index, CHECK);
669
670 if (Signature::is_method(sig)) {
671 // Format check method name and signature
672 verify_legal_method_name(name, CHECK);
673 verify_legal_method_signature(name, sig, CHECK);
674 } else {
675 // Format check field name and signature
676 verify_legal_field_name(name, CHECK);
677 verify_legal_field_signature(name, sig, CHECK);
678 }
679 }
680 break;
681 }
682 case JVM_CONSTANT_Dynamic: {
683 const int name_and_type_ref_index =
684 cp->name_and_type_ref_index_at(index);
685 // already verified to be utf8
686 const int name_ref_index =
687 cp->name_ref_index_at(name_and_type_ref_index);
688 // already verified to be utf8
689 const int signature_ref_index =
690 cp->signature_ref_index_at(name_and_type_ref_index);
691 const Symbol* const name = cp->symbol_at(name_ref_index);
692 const Symbol* const signature = cp->symbol_at(signature_ref_index);
693 if (_need_verify) {
694 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
695 // Need only to be sure signature is the right type.
696 if (Signature::is_method(signature)) {
697 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
698 }
699 }
700 break;
701 }
702 case JVM_CONSTANT_InvokeDynamic:
703 case JVM_CONSTANT_Fieldref:
704 case JVM_CONSTANT_Methodref:
705 case JVM_CONSTANT_InterfaceMethodref: {
706 const int name_and_type_ref_index =
707 cp->name_and_type_ref_index_at(index);
708 // already verified to be utf8
709 const int name_ref_index =
710 cp->name_ref_index_at(name_and_type_ref_index);
711 // already verified to be utf8
712 const int signature_ref_index =
713 cp->signature_ref_index_at(name_and_type_ref_index);
714 const Symbol* const name = cp->symbol_at(name_ref_index);
715 const Symbol* const signature = cp->symbol_at(signature_ref_index);
716 if (tag == JVM_CONSTANT_Fieldref) {
717 if (_need_verify) {
718 // Field name and signature are verified above, when iterating NameAndType_info.
719 // Need only to be sure signature is non-zero length and the right type.
720 if (Signature::is_method(signature)) {
721 throwIllegalSignature("Field", name, signature, CHECK);
722 }
723 }
724 } else {
725 if (_need_verify) {
726 // Method name and signature are verified above, when iterating NameAndType_info.
727 // Need only to be sure signature is non-zero length and the right type.
728 if (!Signature::is_method(signature)) {
729 throwIllegalSignature("Method", name, signature, CHECK);
730 }
731 }
732 // 4509014: If a class method name begins with '<', it must be "<init>"
733 const unsigned int name_len = name->utf8_length();
734 if (tag == JVM_CONSTANT_Methodref &&
735 name_len != 0 &&
736 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
737 name != vmSymbols::object_initializer_name()) {
738 classfile_parse_error(
739 "Bad method name at constant pool index %u in class file %s",
740 name_ref_index, CHECK);
741 }
742 }
743 break;
744 }
745 case JVM_CONSTANT_MethodHandle: {
746 const int ref_index = cp->method_handle_index_at(index);
747 const int ref_kind = cp->method_handle_ref_kind_at(index);
748 switch (ref_kind) {
749 case JVM_REF_invokeVirtual:
750 case JVM_REF_invokeStatic:
751 case JVM_REF_invokeSpecial:
752 case JVM_REF_newInvokeSpecial: {
753 const int name_and_type_ref_index =
754 cp->name_and_type_ref_index_at(ref_index);
755 const int name_ref_index =
756 cp->name_ref_index_at(name_and_type_ref_index);
757 const Symbol* const name = cp->symbol_at(name_ref_index);
758 if (ref_kind == JVM_REF_newInvokeSpecial) {
759 if (name != vmSymbols::object_initializer_name()) {
760 classfile_parse_error(
761 "Bad constructor name at constant pool index %u in class file %s",
762 name_ref_index, CHECK);
763 }
764 } else {
765 if (name == vmSymbols::object_initializer_name()) {
766 classfile_parse_error(
767 "Bad method name at constant pool index %u in class file %s",
768 name_ref_index, CHECK);
769 }
770 }
771 break;
772 }
773 // Other ref_kinds are already fully checked in previous pass.
774 } // switch(ref_kind)
775 break;
776 }
777 case JVM_CONSTANT_MethodType: {
778 const Symbol* const no_name = vmSymbols::type_name(); // place holder
779 const Symbol* const signature = cp->method_type_signature_at(index);
780 verify_legal_method_signature(no_name, signature, CHECK);
781 break;
782 }
783 case JVM_CONSTANT_Utf8: {
784 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
785 }
786 } // switch(tag)
787 } // end of for
788 }
789
clear_cp_patch_at(int index)790 Handle ClassFileParser::clear_cp_patch_at(int index) {
791 Handle patch = cp_patch_at(index);
792 _cp_patches->at_put(index, Handle());
793 assert(!has_cp_patch_at(index), "");
794 return patch;
795 }
796
patch_class(ConstantPool * cp,int class_index,Klass * k,Symbol * name)797 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
798 int name_index = _orig_cp_size + _num_patched_klasses;
799 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
800
801 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
802 _num_patched_klasses ++;
803 }
804
patch_constant_pool(ConstantPool * cp,int index,Handle patch,TRAPS)805 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
806 int index,
807 Handle patch,
808 TRAPS) {
809 assert(cp != NULL, "invariant");
810
811 BasicType patch_type = T_VOID;
812
813 switch (cp->tag_at(index).value()) {
814
815 case JVM_CONSTANT_UnresolvedClass: {
816 // Patching a class means pre-resolving it.
817 // The name in the constant pool is ignored.
818 if (java_lang_Class::is_instance(patch())) {
819 guarantee_property(!java_lang_Class::is_primitive(patch()),
820 "Illegal class patch at %d in class file %s",
821 index, CHECK);
822 Klass* k = java_lang_Class::as_Klass(patch());
823 patch_class(cp, index, k, k->name());
824 } else {
825 guarantee_property(java_lang_String::is_instance(patch()),
826 "Illegal class patch at %d in class file %s",
827 index, CHECK);
828 Symbol* const name = java_lang_String::as_symbol(patch());
829 patch_class(cp, index, NULL, name);
830 }
831 break;
832 }
833
834 case JVM_CONSTANT_String: {
835 // skip this patch and don't clear it. Needs the oop array for resolved
836 // references to be created first.
837 return;
838 }
839 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
840 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
841 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
842 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
843 patch_prim:
844 {
845 jvalue value;
846 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
847 guarantee_property(value_type == patch_type,
848 "Illegal primitive patch at %d in class file %s",
849 index, CHECK);
850 switch (value_type) {
851 case T_INT: cp->int_at_put(index, value.i); break;
852 case T_FLOAT: cp->float_at_put(index, value.f); break;
853 case T_LONG: cp->long_at_put(index, value.j); break;
854 case T_DOUBLE: cp->double_at_put(index, value.d); break;
855 default: assert(false, "");
856 }
857 } // end patch_prim label
858 break;
859
860 default: {
861 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
862 guarantee_property(!has_cp_patch_at(index),
863 "Illegal unexpected patch at %d in class file %s",
864 index, CHECK);
865 return;
866 }
867 } // end of switch(tag)
868
869 // On fall-through, mark the patch as used.
870 clear_cp_patch_at(index);
871 }
872 class NameSigHash: public ResourceObj {
873 public:
874 const Symbol* _name; // name
875 const Symbol* _sig; // signature
876 NameSigHash* _next; // Next entry in hash table
877 };
878
879 static const int HASH_ROW_SIZE = 256;
880
hash(const Symbol * name,const Symbol * sig)881 static unsigned int hash(const Symbol* name, const Symbol* sig) {
882 unsigned int raw_hash = 0;
883 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
884 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
885
886 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
887 }
888
889
initialize_hashtable(NameSigHash ** table)890 static void initialize_hashtable(NameSigHash** table) {
891 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
892 }
893 // Return false if the name/sig combination is found in table.
894 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
895 // The old format checker uses heap sort to find duplicates.
896 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
897 // of table since we don't expect Symbol*'s to move.
put_after_lookup(const Symbol * name,const Symbol * sig,NameSigHash ** table)898 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
899 assert(name != NULL, "name in constant pool is NULL");
900
901 // First lookup for duplicates
902 int index = hash(name, sig);
903 NameSigHash* entry = table[index];
904 while (entry != NULL) {
905 if (entry->_name == name && entry->_sig == sig) {
906 return false;
907 }
908 entry = entry->_next;
909 }
910
911 // No duplicate is found, allocate a new entry and fill it.
912 entry = new NameSigHash();
913 entry->_name = name;
914 entry->_sig = sig;
915
916 // Insert into hash table
917 entry->_next = table[index];
918 table[index] = entry;
919
920 return true;
921 }
922
923 // Side-effects: populates the _local_interfaces field
parse_interfaces(const ClassFileStream * const stream,const int itfs_len,ConstantPool * const cp,bool * const has_nonstatic_concrete_methods,TRAPS)924 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
925 const int itfs_len,
926 ConstantPool* const cp,
927 bool* const has_nonstatic_concrete_methods,
928 TRAPS) {
929 assert(stream != NULL, "invariant");
930 assert(cp != NULL, "invariant");
931 assert(has_nonstatic_concrete_methods != NULL, "invariant");
932
933 if (itfs_len == 0) {
934 _local_interfaces = Universe::the_empty_instance_klass_array();
935 } else {
936 assert(itfs_len > 0, "only called for len>0");
937 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
938
939 int index;
940 for (index = 0; index < itfs_len; index++) {
941 const u2 interface_index = stream->get_u2(CHECK);
942 Klass* interf;
943 check_property(
944 valid_klass_reference_at(interface_index),
945 "Interface name has bad constant pool index %u in class file %s",
946 interface_index, CHECK);
947 if (cp->tag_at(interface_index).is_klass()) {
948 interf = cp->resolved_klass_at(interface_index);
949 } else {
950 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
951
952 // Don't need to check legal name because it's checked when parsing constant pool.
953 // But need to make sure it's not an array type.
954 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
955 "Bad interface name in class file %s", CHECK);
956
957 // Call resolve_super so classcircularity is checked
958 interf = SystemDictionary::resolve_super_or_fail(
959 _class_name,
960 unresolved_klass,
961 Handle(THREAD, _loader_data->class_loader()),
962 _protection_domain,
963 false,
964 CHECK);
965 }
966
967 if (!interf->is_interface()) {
968 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
969 err_msg("class %s can not implement %s, because it is not an interface (%s)",
970 _class_name->as_klass_external_name(),
971 interf->external_name(),
972 interf->class_in_module_of_loader()));
973 }
974
975 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
976 *has_nonstatic_concrete_methods = true;
977 }
978 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
979 }
980
981 if (!_need_verify || itfs_len <= 1) {
982 return;
983 }
984
985 // Check if there's any duplicates in interfaces
986 ResourceMark rm(THREAD);
987 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
988 NameSigHash*,
989 HASH_ROW_SIZE);
990 initialize_hashtable(interface_names);
991 bool dup = false;
992 const Symbol* name = NULL;
993 {
994 debug_only(NoSafepointVerifier nsv;)
995 for (index = 0; index < itfs_len; index++) {
996 const InstanceKlass* const k = _local_interfaces->at(index);
997 name = k->name();
998 // If no duplicates, add (name, NULL) in hashtable interface_names.
999 if (!put_after_lookup(name, NULL, interface_names)) {
1000 dup = true;
1001 break;
1002 }
1003 }
1004 }
1005 if (dup) {
1006 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
1007 name->as_C_string(), CHECK);
1008 }
1009 }
1010 }
1011
verify_constantvalue(const ConstantPool * const cp,int constantvalue_index,int signature_index,TRAPS) const1012 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
1013 int constantvalue_index,
1014 int signature_index,
1015 TRAPS) const {
1016 // Make sure the constant pool entry is of a type appropriate to this field
1017 guarantee_property(
1018 (constantvalue_index > 0 &&
1019 constantvalue_index < cp->length()),
1020 "Bad initial value index %u in ConstantValue attribute in class file %s",
1021 constantvalue_index, CHECK);
1022
1023 const constantTag value_type = cp->tag_at(constantvalue_index);
1024 switch(cp->basic_type_for_signature_at(signature_index)) {
1025 case T_LONG: {
1026 guarantee_property(value_type.is_long(),
1027 "Inconsistent constant value type in class file %s",
1028 CHECK);
1029 break;
1030 }
1031 case T_FLOAT: {
1032 guarantee_property(value_type.is_float(),
1033 "Inconsistent constant value type in class file %s",
1034 CHECK);
1035 break;
1036 }
1037 case T_DOUBLE: {
1038 guarantee_property(value_type.is_double(),
1039 "Inconsistent constant value type in class file %s",
1040 CHECK);
1041 break;
1042 }
1043 case T_BYTE:
1044 case T_CHAR:
1045 case T_SHORT:
1046 case T_BOOLEAN:
1047 case T_INT: {
1048 guarantee_property(value_type.is_int(),
1049 "Inconsistent constant value type in class file %s",
1050 CHECK);
1051 break;
1052 }
1053 case T_OBJECT: {
1054 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1055 && value_type.is_string()),
1056 "Bad string initial value in class file %s",
1057 CHECK);
1058 break;
1059 }
1060 default: {
1061 classfile_parse_error("Unable to set initial value %u in class file %s",
1062 constantvalue_index,
1063 CHECK);
1064 }
1065 }
1066 }
1067
1068 class AnnotationCollector : public ResourceObj{
1069 public:
1070 enum Location { _in_field, _in_method, _in_class };
1071 enum ID {
1072 _unknown = 0,
1073 _method_CallerSensitive,
1074 _method_ForceInline,
1075 _method_DontInline,
1076 _method_InjectedProfile,
1077 _method_LambdaForm_Compiled,
1078 _method_Hidden,
1079 _method_HotSpotIntrinsicCandidate,
1080 _jdk_internal_vm_annotation_Contended,
1081 _field_Stable,
1082 _jdk_internal_vm_annotation_ReservedStackAccess,
1083 _annotation_LIMIT
1084 };
1085 const Location _location;
1086 int _annotations_present;
1087 u2 _contended_group;
1088
AnnotationCollector(Location location)1089 AnnotationCollector(Location location)
1090 : _location(location), _annotations_present(0)
1091 {
1092 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1093 }
1094 // If this annotation name has an ID, report it (or _none).
1095 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
1096 // Set the annotation name:
set_annotation(ID id)1097 void set_annotation(ID id) {
1098 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1099 _annotations_present |= nth_bit((int)id);
1100 }
1101
remove_annotation(ID id)1102 void remove_annotation(ID id) {
1103 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1104 _annotations_present &= ~nth_bit((int)id);
1105 }
1106
1107 // Report if the annotation is present.
has_any_annotations() const1108 bool has_any_annotations() const { return _annotations_present != 0; }
has_annotation(ID id) const1109 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1110
set_contended_group(u2 group)1111 void set_contended_group(u2 group) { _contended_group = group; }
contended_group() const1112 u2 contended_group() const { return _contended_group; }
1113
is_contended() const1114 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1115
set_stable(bool stable)1116 void set_stable(bool stable) { set_annotation(_field_Stable); }
is_stable() const1117 bool is_stable() const { return has_annotation(_field_Stable); }
1118 };
1119
1120 // This class also doubles as a holder for metadata cleanup.
1121 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1122 private:
1123 ClassLoaderData* _loader_data;
1124 AnnotationArray* _field_annotations;
1125 AnnotationArray* _field_type_annotations;
1126 public:
FieldAnnotationCollector(ClassLoaderData * loader_data)1127 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1128 AnnotationCollector(_in_field),
1129 _loader_data(loader_data),
1130 _field_annotations(NULL),
1131 _field_type_annotations(NULL) {}
1132 ~FieldAnnotationCollector();
1133 void apply_to(FieldInfo* f);
field_annotations()1134 AnnotationArray* field_annotations() { return _field_annotations; }
field_type_annotations()1135 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1136
set_field_annotations(AnnotationArray * a)1137 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
set_field_type_annotations(AnnotationArray * a)1138 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1139 };
1140
1141 class MethodAnnotationCollector : public AnnotationCollector{
1142 public:
MethodAnnotationCollector()1143 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1144 void apply_to(const methodHandle& m);
1145 };
1146
1147 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1148 public:
ClassAnnotationCollector()1149 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1150 void apply_to(InstanceKlass* ik);
1151 };
1152
1153
1154 static int skip_annotation_value(const u1*, int, int); // fwd decl
1155
1156 // Safely increment index by val if does not pass limit
1157 #define SAFE_ADD(index, limit, val) \
1158 if (index >= limit - val) return limit; \
1159 index += val;
1160
1161 // Skip an annotation. Return >=limit if there is any problem.
skip_annotation(const u1 * buffer,int limit,int index)1162 static int skip_annotation(const u1* buffer, int limit, int index) {
1163 assert(buffer != NULL, "invariant");
1164 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1165 // value := switch (tag:u1) { ... }
1166 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1167 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1168 while (--nmem >= 0 && index < limit) {
1169 SAFE_ADD(index, limit, 2); // skip member
1170 index = skip_annotation_value(buffer, limit, index);
1171 }
1172 return index;
1173 }
1174
1175 // Skip an annotation value. Return >=limit if there is any problem.
skip_annotation_value(const u1 * buffer,int limit,int index)1176 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1177 assert(buffer != NULL, "invariant");
1178
1179 // value := switch (tag:u1) {
1180 // case B, C, I, S, Z, D, F, J, c: con:u2;
1181 // case e: e_class:u2 e_name:u2;
1182 // case s: s_con:u2;
1183 // case [: do(nval:u2) {value};
1184 // case @: annotation;
1185 // case s: s_con:u2;
1186 // }
1187 SAFE_ADD(index, limit, 1); // read tag
1188 const u1 tag = buffer[index - 1];
1189 switch (tag) {
1190 case 'B':
1191 case 'C':
1192 case 'I':
1193 case 'S':
1194 case 'Z':
1195 case 'D':
1196 case 'F':
1197 case 'J':
1198 case 'c':
1199 case 's':
1200 SAFE_ADD(index, limit, 2); // skip con or s_con
1201 break;
1202 case 'e':
1203 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1204 break;
1205 case '[':
1206 {
1207 SAFE_ADD(index, limit, 2); // read nval
1208 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1209 while (--nval >= 0 && index < limit) {
1210 index = skip_annotation_value(buffer, limit, index);
1211 }
1212 }
1213 break;
1214 case '@':
1215 index = skip_annotation(buffer, limit, index);
1216 break;
1217 default:
1218 return limit; // bad tag byte
1219 }
1220 return index;
1221 }
1222
1223 // Sift through annotations, looking for those significant to the VM:
parse_annotations(const ConstantPool * const cp,const u1 * buffer,int limit,AnnotationCollector * coll,ClassLoaderData * loader_data,const bool can_access_vm_annotations,TRAPS)1224 static void parse_annotations(const ConstantPool* const cp,
1225 const u1* buffer, int limit,
1226 AnnotationCollector* coll,
1227 ClassLoaderData* loader_data,
1228 const bool can_access_vm_annotations,
1229 TRAPS) {
1230
1231 assert(cp != NULL, "invariant");
1232 assert(buffer != NULL, "invariant");
1233 assert(coll != NULL, "invariant");
1234 assert(loader_data != NULL, "invariant");
1235
1236 // annotations := do(nann:u2) {annotation}
1237 int index = 2; // read nann
1238 if (index >= limit) return;
1239 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1240 enum { // initial annotation layout
1241 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1242 count_off = 2, // u2 such as 1 (one value)
1243 member_off = 4, // utf8 such as 'value'
1244 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1245 e_tag_val = 'e',
1246 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1247 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1248 e_size = 11, // end of 'e' annotation
1249 c_tag_val = 'c', // payload is type
1250 c_con_off = 7, // utf8 payload, such as 'I'
1251 c_size = 9, // end of 'c' annotation
1252 s_tag_val = 's', // payload is String
1253 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1254 s_size = 9,
1255 min_size = 6 // smallest possible size (zero members)
1256 };
1257 // Cannot add min_size to index in case of overflow MAX_INT
1258 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1259 int index0 = index;
1260 index = skip_annotation(buffer, limit, index);
1261 const u1* const abase = buffer + index0;
1262 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1263 const int count = Bytes::get_Java_u2((address)abase + count_off);
1264 const Symbol* const aname = check_symbol_at(cp, atype);
1265 if (aname == NULL) break; // invalid annotation name
1266 const Symbol* member = NULL;
1267 if (count >= 1) {
1268 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1269 member = check_symbol_at(cp, member_index);
1270 if (member == NULL) break; // invalid member name
1271 }
1272
1273 // Here is where parsing particular annotations will take place.
1274 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1275 if (AnnotationCollector::_unknown == id) continue;
1276 coll->set_annotation(id);
1277
1278 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1279 // @Contended can optionally specify the contention group.
1280 //
1281 // Contended group defines the equivalence class over the fields:
1282 // the fields within the same contended group are not treated distinct.
1283 // The only exception is default group, which does not incur the
1284 // equivalence. Naturally, contention group for classes is meaningless.
1285 //
1286 // While the contention group is specified as String, annotation
1287 // values are already interned, and we might as well use the constant
1288 // pool index as the group tag.
1289 //
1290 u2 group_index = 0; // default contended group
1291 if (count == 1
1292 && s_size == (index - index0) // match size
1293 && s_tag_val == *(abase + tag_off)
1294 && member == vmSymbols::value_name()) {
1295 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1296 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1297 group_index = 0; // default contended group
1298 }
1299 }
1300 coll->set_contended_group(group_index);
1301 }
1302 }
1303 }
1304
1305
1306 // Parse attributes for a field.
parse_field_attributes(const ClassFileStream * const cfs,u2 attributes_count,bool is_static,u2 signature_index,u2 * const constantvalue_index_addr,bool * const is_synthetic_addr,u2 * const generic_signature_index_addr,ClassFileParser::FieldAnnotationCollector * parsed_annotations,TRAPS)1307 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1308 u2 attributes_count,
1309 bool is_static, u2 signature_index,
1310 u2* const constantvalue_index_addr,
1311 bool* const is_synthetic_addr,
1312 u2* const generic_signature_index_addr,
1313 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1314 TRAPS) {
1315 assert(cfs != NULL, "invariant");
1316 assert(constantvalue_index_addr != NULL, "invariant");
1317 assert(is_synthetic_addr != NULL, "invariant");
1318 assert(generic_signature_index_addr != NULL, "invariant");
1319 assert(parsed_annotations != NULL, "invariant");
1320 assert(attributes_count > 0, "attributes_count should be greater than 0");
1321
1322 u2 constantvalue_index = 0;
1323 u2 generic_signature_index = 0;
1324 bool is_synthetic = false;
1325 const u1* runtime_visible_annotations = NULL;
1326 int runtime_visible_annotations_length = 0;
1327 const u1* runtime_invisible_annotations = NULL;
1328 int runtime_invisible_annotations_length = 0;
1329 const u1* runtime_visible_type_annotations = NULL;
1330 int runtime_visible_type_annotations_length = 0;
1331 const u1* runtime_invisible_type_annotations = NULL;
1332 int runtime_invisible_type_annotations_length = 0;
1333 bool runtime_invisible_annotations_exists = false;
1334 bool runtime_invisible_type_annotations_exists = false;
1335 const ConstantPool* const cp = _cp;
1336
1337 while (attributes_count--) {
1338 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1339 const u2 attribute_name_index = cfs->get_u2_fast();
1340 const u4 attribute_length = cfs->get_u4_fast();
1341 check_property(valid_symbol_at(attribute_name_index),
1342 "Invalid field attribute index %u in class file %s",
1343 attribute_name_index,
1344 CHECK);
1345
1346 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1347 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1348 // ignore if non-static
1349 if (constantvalue_index != 0) {
1350 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1351 }
1352 check_property(
1353 attribute_length == 2,
1354 "Invalid ConstantValue field attribute length %u in class file %s",
1355 attribute_length, CHECK);
1356
1357 constantvalue_index = cfs->get_u2(CHECK);
1358 if (_need_verify) {
1359 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1360 }
1361 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1362 if (attribute_length != 0) {
1363 classfile_parse_error(
1364 "Invalid Synthetic field attribute length %u in class file %s",
1365 attribute_length, CHECK);
1366 }
1367 is_synthetic = true;
1368 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1369 if (attribute_length != 0) {
1370 classfile_parse_error(
1371 "Invalid Deprecated field attribute length %u in class file %s",
1372 attribute_length, CHECK);
1373 }
1374 } else if (_major_version >= JAVA_1_5_VERSION) {
1375 if (attribute_name == vmSymbols::tag_signature()) {
1376 if (generic_signature_index != 0) {
1377 classfile_parse_error(
1378 "Multiple Signature attributes for field in class file %s", CHECK);
1379 }
1380 if (attribute_length != 2) {
1381 classfile_parse_error(
1382 "Wrong size %u for field's Signature attribute in class file %s",
1383 attribute_length, CHECK);
1384 }
1385 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1386 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1387 if (runtime_visible_annotations != NULL) {
1388 classfile_parse_error(
1389 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1390 }
1391 runtime_visible_annotations_length = attribute_length;
1392 runtime_visible_annotations = cfs->current();
1393 assert(runtime_visible_annotations != NULL, "null visible annotations");
1394 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1395 parse_annotations(cp,
1396 runtime_visible_annotations,
1397 runtime_visible_annotations_length,
1398 parsed_annotations,
1399 _loader_data,
1400 _can_access_vm_annotations,
1401 CHECK);
1402 cfs->skip_u1_fast(runtime_visible_annotations_length);
1403 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1404 if (runtime_invisible_annotations_exists) {
1405 classfile_parse_error(
1406 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1407 }
1408 runtime_invisible_annotations_exists = true;
1409 if (PreserveAllAnnotations) {
1410 runtime_invisible_annotations_length = attribute_length;
1411 runtime_invisible_annotations = cfs->current();
1412 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1413 }
1414 cfs->skip_u1(attribute_length, CHECK);
1415 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1416 if (runtime_visible_type_annotations != NULL) {
1417 classfile_parse_error(
1418 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1419 }
1420 runtime_visible_type_annotations_length = attribute_length;
1421 runtime_visible_type_annotations = cfs->current();
1422 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1423 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1424 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1425 if (runtime_invisible_type_annotations_exists) {
1426 classfile_parse_error(
1427 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1428 } else {
1429 runtime_invisible_type_annotations_exists = true;
1430 }
1431 if (PreserveAllAnnotations) {
1432 runtime_invisible_type_annotations_length = attribute_length;
1433 runtime_invisible_type_annotations = cfs->current();
1434 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1435 }
1436 cfs->skip_u1(attribute_length, CHECK);
1437 } else {
1438 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1439 }
1440 } else {
1441 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1442 }
1443 }
1444
1445 *constantvalue_index_addr = constantvalue_index;
1446 *is_synthetic_addr = is_synthetic;
1447 *generic_signature_index_addr = generic_signature_index;
1448 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1449 runtime_visible_annotations_length,
1450 runtime_invisible_annotations,
1451 runtime_invisible_annotations_length,
1452 CHECK);
1453 parsed_annotations->set_field_annotations(a);
1454 a = assemble_annotations(runtime_visible_type_annotations,
1455 runtime_visible_type_annotations_length,
1456 runtime_invisible_type_annotations,
1457 runtime_invisible_type_annotations_length,
1458 CHECK);
1459 parsed_annotations->set_field_type_annotations(a);
1460 return;
1461 }
1462
1463
1464 // Field allocation types. Used for computing field offsets.
1465
1466 enum FieldAllocationType {
1467 STATIC_OOP, // Oops
1468 STATIC_BYTE, // Boolean, Byte, char
1469 STATIC_SHORT, // shorts
1470 STATIC_WORD, // ints
1471 STATIC_DOUBLE, // aligned long or double
1472 NONSTATIC_OOP,
1473 NONSTATIC_BYTE,
1474 NONSTATIC_SHORT,
1475 NONSTATIC_WORD,
1476 NONSTATIC_DOUBLE,
1477 MAX_FIELD_ALLOCATION_TYPE,
1478 BAD_ALLOCATION_TYPE = -1
1479 };
1480
1481 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1482 BAD_ALLOCATION_TYPE, // 0
1483 BAD_ALLOCATION_TYPE, // 1
1484 BAD_ALLOCATION_TYPE, // 2
1485 BAD_ALLOCATION_TYPE, // 3
1486 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1487 NONSTATIC_SHORT, // T_CHAR = 5,
1488 NONSTATIC_WORD, // T_FLOAT = 6,
1489 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1490 NONSTATIC_BYTE, // T_BYTE = 8,
1491 NONSTATIC_SHORT, // T_SHORT = 9,
1492 NONSTATIC_WORD, // T_INT = 10,
1493 NONSTATIC_DOUBLE, // T_LONG = 11,
1494 NONSTATIC_OOP, // T_OBJECT = 12,
1495 NONSTATIC_OOP, // T_ARRAY = 13,
1496 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1497 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1498 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1499 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1500 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1501 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1502 BAD_ALLOCATION_TYPE, // 0
1503 BAD_ALLOCATION_TYPE, // 1
1504 BAD_ALLOCATION_TYPE, // 2
1505 BAD_ALLOCATION_TYPE, // 3
1506 STATIC_BYTE , // T_BOOLEAN = 4,
1507 STATIC_SHORT, // T_CHAR = 5,
1508 STATIC_WORD, // T_FLOAT = 6,
1509 STATIC_DOUBLE, // T_DOUBLE = 7,
1510 STATIC_BYTE, // T_BYTE = 8,
1511 STATIC_SHORT, // T_SHORT = 9,
1512 STATIC_WORD, // T_INT = 10,
1513 STATIC_DOUBLE, // T_LONG = 11,
1514 STATIC_OOP, // T_OBJECT = 12,
1515 STATIC_OOP, // T_ARRAY = 13,
1516 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1517 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1518 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1519 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1520 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1521 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1522 };
1523
basic_type_to_atype(bool is_static,BasicType type)1524 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1525 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1526 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1527 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1528 return result;
1529 }
1530
1531 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1532 public:
1533 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1534
FieldAllocationCount()1535 FieldAllocationCount() {
1536 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1537 count[i] = 0;
1538 }
1539 }
1540
update(bool is_static,BasicType type)1541 FieldAllocationType update(bool is_static, BasicType type) {
1542 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1543 if (atype != BAD_ALLOCATION_TYPE) {
1544 // Make sure there is no overflow with injected fields.
1545 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1546 count[atype]++;
1547 }
1548 return atype;
1549 }
1550 };
1551
1552 // Side-effects: populates the _fields, _fields_annotations,
1553 // _fields_type_annotations fields
parse_fields(const ClassFileStream * const cfs,bool is_interface,FieldAllocationCount * const fac,ConstantPool * cp,const int cp_size,u2 * const java_fields_count_ptr,TRAPS)1554 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1555 bool is_interface,
1556 FieldAllocationCount* const fac,
1557 ConstantPool* cp,
1558 const int cp_size,
1559 u2* const java_fields_count_ptr,
1560 TRAPS) {
1561
1562 assert(cfs != NULL, "invariant");
1563 assert(fac != NULL, "invariant");
1564 assert(cp != NULL, "invariant");
1565 assert(java_fields_count_ptr != NULL, "invariant");
1566
1567 assert(NULL == _fields, "invariant");
1568 assert(NULL == _fields_annotations, "invariant");
1569 assert(NULL == _fields_type_annotations, "invariant");
1570
1571 cfs->guarantee_more(2, CHECK); // length
1572 const u2 length = cfs->get_u2_fast();
1573 *java_fields_count_ptr = length;
1574
1575 int num_injected = 0;
1576 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1577 &num_injected);
1578 const int total_fields = length + num_injected;
1579
1580 // The field array starts with tuples of shorts
1581 // [access, name index, sig index, initial value index, byte offset].
1582 // A generic signature slot only exists for field with generic
1583 // signature attribute. And the access flag is set with
1584 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1585 // signature slots are at the end of the field array and after all
1586 // other fields data.
1587 //
1588 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1589 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1590 // ...
1591 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1592 // [generic signature index]
1593 // [generic signature index]
1594 // ...
1595 //
1596 // Allocate a temporary resource array for field data. For each field,
1597 // a slot is reserved in the temporary array for the generic signature
1598 // index. After parsing all fields, the data are copied to a permanent
1599 // array and any unused slots will be discarded.
1600 ResourceMark rm(THREAD);
1601 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1602 u2,
1603 total_fields * (FieldInfo::field_slots + 1));
1604
1605 // The generic signature slots start after all other fields' data.
1606 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1607 int num_generic_signature = 0;
1608 for (int n = 0; n < length; n++) {
1609 // access_flags, name_index, descriptor_index, attributes_count
1610 cfs->guarantee_more(8, CHECK);
1611
1612 AccessFlags access_flags;
1613 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1614 verify_legal_field_modifiers(flags, is_interface, CHECK);
1615 access_flags.set_flags(flags);
1616
1617 const u2 name_index = cfs->get_u2_fast();
1618 check_property(valid_symbol_at(name_index),
1619 "Invalid constant pool index %u for field name in class file %s",
1620 name_index, CHECK);
1621 const Symbol* const name = cp->symbol_at(name_index);
1622 verify_legal_field_name(name, CHECK);
1623
1624 const u2 signature_index = cfs->get_u2_fast();
1625 check_property(valid_symbol_at(signature_index),
1626 "Invalid constant pool index %u for field signature in class file %s",
1627 signature_index, CHECK);
1628 const Symbol* const sig = cp->symbol_at(signature_index);
1629 verify_legal_field_signature(name, sig, CHECK);
1630
1631 u2 constantvalue_index = 0;
1632 bool is_synthetic = false;
1633 u2 generic_signature_index = 0;
1634 const bool is_static = access_flags.is_static();
1635 FieldAnnotationCollector parsed_annotations(_loader_data);
1636
1637 const u2 attributes_count = cfs->get_u2_fast();
1638 if (attributes_count > 0) {
1639 parse_field_attributes(cfs,
1640 attributes_count,
1641 is_static,
1642 signature_index,
1643 &constantvalue_index,
1644 &is_synthetic,
1645 &generic_signature_index,
1646 &parsed_annotations,
1647 CHECK);
1648
1649 if (parsed_annotations.field_annotations() != NULL) {
1650 if (_fields_annotations == NULL) {
1651 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1652 _loader_data, length, NULL,
1653 CHECK);
1654 }
1655 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1656 parsed_annotations.set_field_annotations(NULL);
1657 }
1658 if (parsed_annotations.field_type_annotations() != NULL) {
1659 if (_fields_type_annotations == NULL) {
1660 _fields_type_annotations =
1661 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1662 length,
1663 NULL,
1664 CHECK);
1665 }
1666 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1667 parsed_annotations.set_field_type_annotations(NULL);
1668 }
1669
1670 if (is_synthetic) {
1671 access_flags.set_is_synthetic();
1672 }
1673 if (generic_signature_index != 0) {
1674 access_flags.set_field_has_generic_signature();
1675 fa[generic_signature_slot] = generic_signature_index;
1676 generic_signature_slot ++;
1677 num_generic_signature ++;
1678 }
1679 }
1680
1681 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1682 field->initialize(access_flags.as_short(),
1683 name_index,
1684 signature_index,
1685 constantvalue_index);
1686 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1687
1688 // Remember how many oops we encountered and compute allocation type
1689 const FieldAllocationType atype = fac->update(is_static, type);
1690 field->set_allocation_type(atype);
1691
1692 // After field is initialized with type, we can augment it with aux info
1693 if (parsed_annotations.has_any_annotations()) {
1694 parsed_annotations.apply_to(field);
1695 if (field->is_contended()) {
1696 _has_contended_fields = true;
1697 }
1698 }
1699 }
1700
1701 int index = length;
1702 if (num_injected != 0) {
1703 for (int n = 0; n < num_injected; n++) {
1704 // Check for duplicates
1705 if (injected[n].may_be_java) {
1706 const Symbol* const name = injected[n].name();
1707 const Symbol* const signature = injected[n].signature();
1708 bool duplicate = false;
1709 for (int i = 0; i < length; i++) {
1710 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1711 if (name == cp->symbol_at(f->name_index()) &&
1712 signature == cp->symbol_at(f->signature_index())) {
1713 // Symbol is desclared in Java so skip this one
1714 duplicate = true;
1715 break;
1716 }
1717 }
1718 if (duplicate) {
1719 // These will be removed from the field array at the end
1720 continue;
1721 }
1722 }
1723
1724 // Injected field
1725 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1726 field->initialize(JVM_ACC_FIELD_INTERNAL,
1727 injected[n].name_index,
1728 injected[n].signature_index,
1729 0);
1730
1731 const BasicType type = Signature::basic_type(injected[n].signature());
1732
1733 // Remember how many oops we encountered and compute allocation type
1734 const FieldAllocationType atype = fac->update(false, type);
1735 field->set_allocation_type(atype);
1736 index++;
1737 }
1738 }
1739
1740 assert(NULL == _fields, "invariant");
1741
1742 _fields =
1743 MetadataFactory::new_array<u2>(_loader_data,
1744 index * FieldInfo::field_slots + num_generic_signature,
1745 CHECK);
1746 // Sometimes injected fields already exist in the Java source so
1747 // the fields array could be too long. In that case the
1748 // fields array is trimed. Also unused slots that were reserved
1749 // for generic signature indexes are discarded.
1750 {
1751 int i = 0;
1752 for (; i < index * FieldInfo::field_slots; i++) {
1753 _fields->at_put(i, fa[i]);
1754 }
1755 for (int j = total_fields * FieldInfo::field_slots;
1756 j < generic_signature_slot; j++) {
1757 _fields->at_put(i++, fa[j]);
1758 }
1759 assert(_fields->length() == i, "");
1760 }
1761
1762 if (_need_verify && length > 1) {
1763 // Check duplicated fields
1764 ResourceMark rm(THREAD);
1765 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1766 THREAD, NameSigHash*, HASH_ROW_SIZE);
1767 initialize_hashtable(names_and_sigs);
1768 bool dup = false;
1769 const Symbol* name = NULL;
1770 const Symbol* sig = NULL;
1771 {
1772 debug_only(NoSafepointVerifier nsv;)
1773 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1774 name = fs.name();
1775 sig = fs.signature();
1776 // If no duplicates, add name/signature in hashtable names_and_sigs.
1777 if (!put_after_lookup(name, sig, names_and_sigs)) {
1778 dup = true;
1779 break;
1780 }
1781 }
1782 }
1783 if (dup) {
1784 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1785 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1786 }
1787 }
1788 }
1789
1790
parse_exception_table(const ClassFileStream * const cfs,u4 code_length,u4 exception_table_length,TRAPS)1791 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1792 u4 code_length,
1793 u4 exception_table_length,
1794 TRAPS) {
1795 assert(cfs != NULL, "invariant");
1796
1797 const unsafe_u2* const exception_table_start = cfs->current();
1798 assert(exception_table_start != NULL, "null exception table");
1799
1800 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1801 // end_pc,
1802 // handler_pc,
1803 // catch_type_index
1804
1805 // Will check legal target after parsing code array in verifier.
1806 if (_need_verify) {
1807 for (unsigned int i = 0; i < exception_table_length; i++) {
1808 const u2 start_pc = cfs->get_u2_fast();
1809 const u2 end_pc = cfs->get_u2_fast();
1810 const u2 handler_pc = cfs->get_u2_fast();
1811 const u2 catch_type_index = cfs->get_u2_fast();
1812 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1813 "Illegal exception table range in class file %s",
1814 CHECK_NULL);
1815 guarantee_property(handler_pc < code_length,
1816 "Illegal exception table handler in class file %s",
1817 CHECK_NULL);
1818 if (catch_type_index != 0) {
1819 guarantee_property(valid_klass_reference_at(catch_type_index),
1820 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1821 }
1822 }
1823 } else {
1824 cfs->skip_u2_fast(exception_table_length * 4);
1825 }
1826 return exception_table_start;
1827 }
1828
parse_linenumber_table(u4 code_attribute_length,u4 code_length,CompressedLineNumberWriteStream ** const write_stream,TRAPS)1829 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1830 u4 code_length,
1831 CompressedLineNumberWriteStream**const write_stream,
1832 TRAPS) {
1833
1834 const ClassFileStream* const cfs = _stream;
1835 unsigned int num_entries = cfs->get_u2(CHECK);
1836
1837 // Each entry is a u2 start_pc, and a u2 line_number
1838 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1839
1840 // Verify line number attribute and table length
1841 check_property(
1842 code_attribute_length == sizeof(u2) + length_in_bytes,
1843 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1844
1845 cfs->guarantee_more(length_in_bytes, CHECK);
1846
1847 if ((*write_stream) == NULL) {
1848 if (length_in_bytes > fixed_buffer_size) {
1849 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1850 } else {
1851 (*write_stream) = new CompressedLineNumberWriteStream(
1852 _linenumbertable_buffer, fixed_buffer_size);
1853 }
1854 }
1855
1856 while (num_entries-- > 0) {
1857 const u2 bci = cfs->get_u2_fast(); // start_pc
1858 const u2 line = cfs->get_u2_fast(); // line_number
1859 guarantee_property(bci < code_length,
1860 "Invalid pc in LineNumberTable in class file %s", CHECK);
1861 (*write_stream)->write_pair(bci, line);
1862 }
1863 }
1864
1865
1866 class LVT_Hash : public AllStatic {
1867 public:
1868
equals(LocalVariableTableElement const & e0,LocalVariableTableElement const & e1)1869 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1870 /*
1871 * 3-tuple start_bci/length/slot has to be unique key,
1872 * so the following comparison seems to be redundant:
1873 * && elem->name_cp_index == entry->_elem->name_cp_index
1874 */
1875 return (e0.start_bci == e1.start_bci &&
1876 e0.length == e1.length &&
1877 e0.name_cp_index == e1.name_cp_index &&
1878 e0.slot == e1.slot);
1879 }
1880
hash(LocalVariableTableElement const & e0)1881 static unsigned int hash(LocalVariableTableElement const& e0) {
1882 unsigned int raw_hash = e0.start_bci;
1883
1884 raw_hash = e0.length + raw_hash * 37;
1885 raw_hash = e0.name_cp_index + raw_hash * 37;
1886 raw_hash = e0.slot + raw_hash * 37;
1887
1888 return raw_hash;
1889 }
1890 };
1891
1892
1893 // Class file LocalVariableTable elements.
1894 class Classfile_LVT_Element {
1895 public:
1896 u2 start_bci;
1897 u2 length;
1898 u2 name_cp_index;
1899 u2 descriptor_cp_index;
1900 u2 slot;
1901 };
1902
copy_lvt_element(const Classfile_LVT_Element * const src,LocalVariableTableElement * const lvt)1903 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1904 LocalVariableTableElement* const lvt) {
1905 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1906 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1907 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1908 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1909 lvt->signature_cp_index = 0;
1910 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1911 }
1912
1913 // Function is used to parse both attributes:
1914 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
parse_localvariable_table(const ClassFileStream * cfs,u4 code_length,u2 max_locals,u4 code_attribute_length,u2 * const localvariable_table_length,bool isLVTT,TRAPS)1915 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1916 u4 code_length,
1917 u2 max_locals,
1918 u4 code_attribute_length,
1919 u2* const localvariable_table_length,
1920 bool isLVTT,
1921 TRAPS) {
1922 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1923 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1924 const unsigned int size =
1925 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1926
1927 const ConstantPool* const cp = _cp;
1928
1929 // Verify local variable table attribute has right length
1930 if (_need_verify) {
1931 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1932 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1933 }
1934
1935 const unsafe_u2* const localvariable_table_start = cfs->current();
1936 assert(localvariable_table_start != NULL, "null local variable table");
1937 if (!_need_verify) {
1938 cfs->skip_u2_fast(size);
1939 } else {
1940 cfs->guarantee_more(size * 2, CHECK_NULL);
1941 for(int i = 0; i < (*localvariable_table_length); i++) {
1942 const u2 start_pc = cfs->get_u2_fast();
1943 const u2 length = cfs->get_u2_fast();
1944 const u2 name_index = cfs->get_u2_fast();
1945 const u2 descriptor_index = cfs->get_u2_fast();
1946 const u2 index = cfs->get_u2_fast();
1947 // Assign to a u4 to avoid overflow
1948 const u4 end_pc = (u4)start_pc + (u4)length;
1949
1950 if (start_pc >= code_length) {
1951 classfile_parse_error(
1952 "Invalid start_pc %u in %s in class file %s",
1953 start_pc, tbl_name, CHECK_NULL);
1954 }
1955 if (end_pc > code_length) {
1956 classfile_parse_error(
1957 "Invalid length %u in %s in class file %s",
1958 length, tbl_name, CHECK_NULL);
1959 }
1960 const int cp_size = cp->length();
1961 guarantee_property(valid_symbol_at(name_index),
1962 "Name index %u in %s has bad constant type in class file %s",
1963 name_index, tbl_name, CHECK_NULL);
1964 guarantee_property(valid_symbol_at(descriptor_index),
1965 "Signature index %u in %s has bad constant type in class file %s",
1966 descriptor_index, tbl_name, CHECK_NULL);
1967
1968 const Symbol* const name = cp->symbol_at(name_index);
1969 const Symbol* const sig = cp->symbol_at(descriptor_index);
1970 verify_legal_field_name(name, CHECK_NULL);
1971 u2 extra_slot = 0;
1972 if (!isLVTT) {
1973 verify_legal_field_signature(name, sig, CHECK_NULL);
1974
1975 // 4894874: check special cases for double and long local variables
1976 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1977 sig == vmSymbols::type_signature(T_LONG)) {
1978 extra_slot = 1;
1979 }
1980 }
1981 guarantee_property((index + extra_slot) < max_locals,
1982 "Invalid index %u in %s in class file %s",
1983 index, tbl_name, CHECK_NULL);
1984 }
1985 }
1986 return localvariable_table_start;
1987 }
1988
parse_stackmap_table(const ClassFileStream * const cfs,u4 code_attribute_length,bool need_verify,TRAPS)1989 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1990 u4 code_attribute_length,
1991 bool need_verify,
1992 TRAPS) {
1993 assert(cfs != NULL, "invariant");
1994
1995 if (0 == code_attribute_length) {
1996 return NULL;
1997 }
1998
1999 const u1* const stackmap_table_start = cfs->current();
2000 assert(stackmap_table_start != NULL, "null stackmap table");
2001
2002 // check code_attribute_length first
2003 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2004
2005 if (!need_verify && !DumpSharedSpaces) {
2006 return NULL;
2007 }
2008 return stackmap_table_start;
2009 }
2010
parse_checked_exceptions(const ClassFileStream * const cfs,u2 * const checked_exceptions_length,u4 method_attribute_length,TRAPS)2011 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2012 u2* const checked_exceptions_length,
2013 u4 method_attribute_length,
2014 TRAPS) {
2015 assert(cfs != NULL, "invariant");
2016 assert(checked_exceptions_length != NULL, "invariant");
2017
2018 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2019 *checked_exceptions_length = cfs->get_u2_fast();
2020 const unsigned int size =
2021 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2022 const unsafe_u2* const checked_exceptions_start = cfs->current();
2023 assert(checked_exceptions_start != NULL, "null checked exceptions");
2024 if (!_need_verify) {
2025 cfs->skip_u2_fast(size);
2026 } else {
2027 // Verify each value in the checked exception table
2028 u2 checked_exception;
2029 const u2 len = *checked_exceptions_length;
2030 cfs->guarantee_more(2 * len, CHECK_NULL);
2031 for (int i = 0; i < len; i++) {
2032 checked_exception = cfs->get_u2_fast();
2033 check_property(
2034 valid_klass_reference_at(checked_exception),
2035 "Exception name has bad type at constant pool %u in class file %s",
2036 checked_exception, CHECK_NULL);
2037 }
2038 }
2039 // check exceptions attribute length
2040 if (_need_verify) {
2041 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2042 sizeof(u2) * size),
2043 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2044 }
2045 return checked_exceptions_start;
2046 }
2047
throwIllegalSignature(const char * type,const Symbol * name,const Symbol * sig,TRAPS) const2048 void ClassFileParser::throwIllegalSignature(const char* type,
2049 const Symbol* name,
2050 const Symbol* sig,
2051 TRAPS) const {
2052 assert(name != NULL, "invariant");
2053 assert(sig != NULL, "invariant");
2054
2055 ResourceMark rm(THREAD);
2056 Exceptions::fthrow(THREAD_AND_LOCATION,
2057 vmSymbols::java_lang_ClassFormatError(),
2058 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2059 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2060 }
2061
2062 AnnotationCollector::ID
annotation_index(const ClassLoaderData * loader_data,const Symbol * name,const bool can_access_vm_annotations)2063 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2064 const Symbol* name,
2065 const bool can_access_vm_annotations) {
2066 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2067 // Privileged code can use all annotations. Other code silently drops some.
2068 const bool privileged = loader_data->is_boot_class_loader_data() ||
2069 loader_data->is_platform_class_loader_data() ||
2070 can_access_vm_annotations;
2071 switch (sid) {
2072 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2073 if (_location != _in_method) break; // only allow for methods
2074 if (!privileged) break; // only allow in privileged code
2075 return _method_CallerSensitive;
2076 }
2077 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2078 if (_location != _in_method) break; // only allow for methods
2079 if (!privileged) break; // only allow in privileged code
2080 return _method_ForceInline;
2081 }
2082 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2083 if (_location != _in_method) break; // only allow for methods
2084 if (!privileged) break; // only allow in privileged code
2085 return _method_DontInline;
2086 }
2087 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2088 if (_location != _in_method) break; // only allow for methods
2089 if (!privileged) break; // only allow in privileged code
2090 return _method_InjectedProfile;
2091 }
2092 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2093 if (_location != _in_method) break; // only allow for methods
2094 if (!privileged) break; // only allow in privileged code
2095 return _method_LambdaForm_Compiled;
2096 }
2097 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
2098 if (_location != _in_method) break; // only allow for methods
2099 if (!privileged) break; // only allow in privileged code
2100 return _method_Hidden;
2101 }
2102 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2103 if (_location != _in_method) break; // only allow for methods
2104 if (!privileged) break; // only allow in privileged code
2105 return _method_HotSpotIntrinsicCandidate;
2106 }
2107 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2108 if (_location != _in_field) break; // only allow for fields
2109 if (!privileged) break; // only allow in privileged code
2110 return _field_Stable;
2111 }
2112 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2113 if (_location != _in_field && _location != _in_class) {
2114 break; // only allow for fields and classes
2115 }
2116 if (!EnableContended || (RestrictContended && !privileged)) {
2117 break; // honor privileges
2118 }
2119 return _jdk_internal_vm_annotation_Contended;
2120 }
2121 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2122 if (_location != _in_method) break; // only allow for methods
2123 if (RestrictReservedStack && !privileged) break; // honor privileges
2124 return _jdk_internal_vm_annotation_ReservedStackAccess;
2125 }
2126 default: {
2127 break;
2128 }
2129 }
2130 return AnnotationCollector::_unknown;
2131 }
2132
apply_to(FieldInfo * f)2133 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2134 if (is_contended())
2135 f->set_contended_group(contended_group());
2136 if (is_stable())
2137 f->set_stable(true);
2138 }
2139
~FieldAnnotationCollector()2140 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2141 // If there's an error deallocate metadata for field annotations
2142 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2143 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2144 }
2145
apply_to(const methodHandle & m)2146 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2147 if (has_annotation(_method_CallerSensitive))
2148 m->set_caller_sensitive(true);
2149 if (has_annotation(_method_ForceInline))
2150 m->set_force_inline(true);
2151 if (has_annotation(_method_DontInline))
2152 m->set_dont_inline(true);
2153 if (has_annotation(_method_InjectedProfile))
2154 m->set_has_injected_profile(true);
2155 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2156 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2157 if (has_annotation(_method_Hidden))
2158 m->set_hidden(true);
2159 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2160 m->set_intrinsic_candidate(true);
2161 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2162 m->set_has_reserved_stack_access(true);
2163 }
2164
apply_to(InstanceKlass * ik)2165 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2166 assert(ik != NULL, "invariant");
2167 ik->set_is_contended(is_contended());
2168 }
2169
2170 #define MAX_ARGS_SIZE 255
2171 #define MAX_CODE_SIZE 65535
2172 #define INITIAL_MAX_LVT_NUMBER 256
2173
2174 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2175 *
2176 * Rules for LVT's and LVTT's are:
2177 * - There can be any number of LVT's and LVTT's.
2178 * - If there are n LVT's, it is the same as if there was just
2179 * one LVT containing all the entries from the n LVT's.
2180 * - There may be no more than one LVT entry per local variable.
2181 * Two LVT entries are 'equal' if these fields are the same:
2182 * start_pc, length, name, slot
2183 * - There may be no more than one LVTT entry per each LVT entry.
2184 * Each LVTT entry has to match some LVT entry.
2185 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2186 */
copy_localvariable_table(const ConstMethod * cm,int lvt_cnt,u2 * const localvariable_table_length,const unsafe_u2 ** const localvariable_table_start,int lvtt_cnt,u2 * const localvariable_type_table_length,const unsafe_u2 ** const localvariable_type_table_start,TRAPS)2187 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2188 int lvt_cnt,
2189 u2* const localvariable_table_length,
2190 const unsafe_u2** const localvariable_table_start,
2191 int lvtt_cnt,
2192 u2* const localvariable_type_table_length,
2193 const unsafe_u2** const localvariable_type_table_start,
2194 TRAPS) {
2195
2196 ResourceMark rm(THREAD);
2197
2198 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2199 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2200
2201 LVT_HashTable* const table = new LVT_HashTable();
2202
2203 // To fill LocalVariableTable in
2204 const Classfile_LVT_Element* cf_lvt;
2205 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2206
2207 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2208 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2209 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2210 copy_lvt_element(&cf_lvt[idx], lvt);
2211 // If no duplicates, add LVT elem in hashtable.
2212 if (table->put(*lvt, lvt) == false
2213 && _need_verify
2214 && _major_version >= JAVA_1_5_VERSION) {
2215 classfile_parse_error("Duplicated LocalVariableTable attribute "
2216 "entry for '%s' in class file %s",
2217 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2218 CHECK);
2219 }
2220 }
2221 }
2222
2223 // To merge LocalVariableTable and LocalVariableTypeTable
2224 const Classfile_LVT_Element* cf_lvtt;
2225 LocalVariableTableElement lvtt_elem;
2226
2227 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2228 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2229 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2230 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2231 LocalVariableTableElement** entry = table->get(lvtt_elem);
2232 if (entry == NULL) {
2233 if (_need_verify) {
2234 classfile_parse_error("LVTT entry for '%s' in class file %s "
2235 "does not match any LVT entry",
2236 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2237 CHECK);
2238 }
2239 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2240 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2241 "entry for '%s' in class file %s",
2242 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2243 CHECK);
2244 } else {
2245 // to add generic signatures into LocalVariableTable
2246 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2247 }
2248 }
2249 }
2250 }
2251
2252
copy_method_annotations(ConstMethod * cm,const u1 * runtime_visible_annotations,int runtime_visible_annotations_length,const u1 * runtime_invisible_annotations,int runtime_invisible_annotations_length,const u1 * runtime_visible_parameter_annotations,int runtime_visible_parameter_annotations_length,const u1 * runtime_invisible_parameter_annotations,int runtime_invisible_parameter_annotations_length,const u1 * runtime_visible_type_annotations,int runtime_visible_type_annotations_length,const u1 * runtime_invisible_type_annotations,int runtime_invisible_type_annotations_length,const u1 * annotation_default,int annotation_default_length,TRAPS)2253 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2254 const u1* runtime_visible_annotations,
2255 int runtime_visible_annotations_length,
2256 const u1* runtime_invisible_annotations,
2257 int runtime_invisible_annotations_length,
2258 const u1* runtime_visible_parameter_annotations,
2259 int runtime_visible_parameter_annotations_length,
2260 const u1* runtime_invisible_parameter_annotations,
2261 int runtime_invisible_parameter_annotations_length,
2262 const u1* runtime_visible_type_annotations,
2263 int runtime_visible_type_annotations_length,
2264 const u1* runtime_invisible_type_annotations,
2265 int runtime_invisible_type_annotations_length,
2266 const u1* annotation_default,
2267 int annotation_default_length,
2268 TRAPS) {
2269
2270 AnnotationArray* a;
2271
2272 if (runtime_visible_annotations_length +
2273 runtime_invisible_annotations_length > 0) {
2274 a = assemble_annotations(runtime_visible_annotations,
2275 runtime_visible_annotations_length,
2276 runtime_invisible_annotations,
2277 runtime_invisible_annotations_length,
2278 CHECK);
2279 cm->set_method_annotations(a);
2280 }
2281
2282 if (runtime_visible_parameter_annotations_length +
2283 runtime_invisible_parameter_annotations_length > 0) {
2284 a = assemble_annotations(runtime_visible_parameter_annotations,
2285 runtime_visible_parameter_annotations_length,
2286 runtime_invisible_parameter_annotations,
2287 runtime_invisible_parameter_annotations_length,
2288 CHECK);
2289 cm->set_parameter_annotations(a);
2290 }
2291
2292 if (annotation_default_length > 0) {
2293 a = assemble_annotations(annotation_default,
2294 annotation_default_length,
2295 NULL,
2296 0,
2297 CHECK);
2298 cm->set_default_annotations(a);
2299 }
2300
2301 if (runtime_visible_type_annotations_length +
2302 runtime_invisible_type_annotations_length > 0) {
2303 a = assemble_annotations(runtime_visible_type_annotations,
2304 runtime_visible_type_annotations_length,
2305 runtime_invisible_type_annotations,
2306 runtime_invisible_type_annotations_length,
2307 CHECK);
2308 cm->set_type_annotations(a);
2309 }
2310 }
2311
2312
2313 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2314 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2315 // Method* to save footprint, so we only know the size of the resulting Method* when the
2316 // entire method attribute is parsed.
2317 //
2318 // The promoted_flags parameter is used to pass relevant access_flags
2319 // from the method back up to the containing klass. These flag values
2320 // are added to klass's access_flags.
2321
parse_method(const ClassFileStream * const cfs,bool is_interface,const ConstantPool * cp,AccessFlags * const promoted_flags,TRAPS)2322 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2323 bool is_interface,
2324 const ConstantPool* cp,
2325 AccessFlags* const promoted_flags,
2326 TRAPS) {
2327 assert(cfs != NULL, "invariant");
2328 assert(cp != NULL, "invariant");
2329 assert(promoted_flags != NULL, "invariant");
2330
2331 ResourceMark rm(THREAD);
2332 // Parse fixed parts:
2333 // access_flags, name_index, descriptor_index, attributes_count
2334 cfs->guarantee_more(8, CHECK_NULL);
2335
2336 int flags = cfs->get_u2_fast();
2337 const u2 name_index = cfs->get_u2_fast();
2338 const int cp_size = cp->length();
2339 check_property(
2340 valid_symbol_at(name_index),
2341 "Illegal constant pool index %u for method name in class file %s",
2342 name_index, CHECK_NULL);
2343 const Symbol* const name = cp->symbol_at(name_index);
2344 verify_legal_method_name(name, CHECK_NULL);
2345
2346 const u2 signature_index = cfs->get_u2_fast();
2347 guarantee_property(
2348 valid_symbol_at(signature_index),
2349 "Illegal constant pool index %u for method signature in class file %s",
2350 signature_index, CHECK_NULL);
2351 const Symbol* const signature = cp->symbol_at(signature_index);
2352
2353 if (name == vmSymbols::class_initializer_name()) {
2354 // We ignore the other access flags for a valid class initializer.
2355 // (JVM Spec 2nd ed., chapter 4.6)
2356 if (_major_version < 51) { // backward compatibility
2357 flags = JVM_ACC_STATIC;
2358 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2359 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2360 } else {
2361 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2362 }
2363 } else {
2364 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2365 }
2366
2367 if (name == vmSymbols::object_initializer_name() && is_interface) {
2368 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2369 }
2370
2371 int args_size = -1; // only used when _need_verify is true
2372 if (_need_verify) {
2373 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2374 verify_legal_method_signature(name, signature, CHECK_NULL);
2375 if (args_size > MAX_ARGS_SIZE) {
2376 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2377 }
2378 }
2379
2380 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2381
2382 // Default values for code and exceptions attribute elements
2383 u2 max_stack = 0;
2384 u2 max_locals = 0;
2385 u4 code_length = 0;
2386 const u1* code_start = 0;
2387 u2 exception_table_length = 0;
2388 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2389 Array<int>* exception_handlers = Universe::the_empty_int_array();
2390 u2 checked_exceptions_length = 0;
2391 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2392 CompressedLineNumberWriteStream* linenumber_table = NULL;
2393 int linenumber_table_length = 0;
2394 int total_lvt_length = 0;
2395 u2 lvt_cnt = 0;
2396 u2 lvtt_cnt = 0;
2397 bool lvt_allocated = false;
2398 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2399 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2400 u2* localvariable_table_length = NULL;
2401 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2402 u2* localvariable_type_table_length = NULL;
2403 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2404 int method_parameters_length = -1;
2405 const u1* method_parameters_data = NULL;
2406 bool method_parameters_seen = false;
2407 bool parsed_code_attribute = false;
2408 bool parsed_checked_exceptions_attribute = false;
2409 bool parsed_stackmap_attribute = false;
2410 // stackmap attribute - JDK1.5
2411 const u1* stackmap_data = NULL;
2412 int stackmap_data_length = 0;
2413 u2 generic_signature_index = 0;
2414 MethodAnnotationCollector parsed_annotations;
2415 const u1* runtime_visible_annotations = NULL;
2416 int runtime_visible_annotations_length = 0;
2417 const u1* runtime_invisible_annotations = NULL;
2418 int runtime_invisible_annotations_length = 0;
2419 const u1* runtime_visible_parameter_annotations = NULL;
2420 int runtime_visible_parameter_annotations_length = 0;
2421 const u1* runtime_invisible_parameter_annotations = NULL;
2422 int runtime_invisible_parameter_annotations_length = 0;
2423 const u1* runtime_visible_type_annotations = NULL;
2424 int runtime_visible_type_annotations_length = 0;
2425 const u1* runtime_invisible_type_annotations = NULL;
2426 int runtime_invisible_type_annotations_length = 0;
2427 bool runtime_invisible_annotations_exists = false;
2428 bool runtime_invisible_type_annotations_exists = false;
2429 bool runtime_invisible_parameter_annotations_exists = false;
2430 const u1* annotation_default = NULL;
2431 int annotation_default_length = 0;
2432
2433 // Parse code and exceptions attribute
2434 u2 method_attributes_count = cfs->get_u2_fast();
2435 while (method_attributes_count--) {
2436 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2437 const u2 method_attribute_name_index = cfs->get_u2_fast();
2438 const u4 method_attribute_length = cfs->get_u4_fast();
2439 check_property(
2440 valid_symbol_at(method_attribute_name_index),
2441 "Invalid method attribute name index %u in class file %s",
2442 method_attribute_name_index, CHECK_NULL);
2443
2444 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2445 if (method_attribute_name == vmSymbols::tag_code()) {
2446 // Parse Code attribute
2447 if (_need_verify) {
2448 guarantee_property(
2449 !access_flags.is_native() && !access_flags.is_abstract(),
2450 "Code attribute in native or abstract methods in class file %s",
2451 CHECK_NULL);
2452 }
2453 if (parsed_code_attribute) {
2454 classfile_parse_error("Multiple Code attributes in class file %s",
2455 CHECK_NULL);
2456 }
2457 parsed_code_attribute = true;
2458
2459 // Stack size, locals size, and code size
2460 cfs->guarantee_more(8, CHECK_NULL);
2461 max_stack = cfs->get_u2_fast();
2462 max_locals = cfs->get_u2_fast();
2463 code_length = cfs->get_u4_fast();
2464 if (_need_verify) {
2465 guarantee_property(args_size <= max_locals,
2466 "Arguments can't fit into locals in class file %s",
2467 CHECK_NULL);
2468 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2469 "Invalid method Code length %u in class file %s",
2470 code_length, CHECK_NULL);
2471 }
2472 // Code pointer
2473 code_start = cfs->current();
2474 assert(code_start != NULL, "null code start");
2475 cfs->guarantee_more(code_length, CHECK_NULL);
2476 cfs->skip_u1_fast(code_length);
2477
2478 // Exception handler table
2479 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2480 exception_table_length = cfs->get_u2_fast();
2481 if (exception_table_length > 0) {
2482 exception_table_start = parse_exception_table(cfs,
2483 code_length,
2484 exception_table_length,
2485 CHECK_NULL);
2486 }
2487
2488 // Parse additional attributes in code attribute
2489 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2490 u2 code_attributes_count = cfs->get_u2_fast();
2491
2492 unsigned int calculated_attribute_length = 0;
2493
2494 calculated_attribute_length =
2495 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2496 calculated_attribute_length +=
2497 code_length +
2498 sizeof(exception_table_length) +
2499 sizeof(code_attributes_count) +
2500 exception_table_length *
2501 ( sizeof(u2) + // start_pc
2502 sizeof(u2) + // end_pc
2503 sizeof(u2) + // handler_pc
2504 sizeof(u2) ); // catch_type_index
2505
2506 while (code_attributes_count--) {
2507 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2508 const u2 code_attribute_name_index = cfs->get_u2_fast();
2509 const u4 code_attribute_length = cfs->get_u4_fast();
2510 calculated_attribute_length += code_attribute_length +
2511 sizeof(code_attribute_name_index) +
2512 sizeof(code_attribute_length);
2513 check_property(valid_symbol_at(code_attribute_name_index),
2514 "Invalid code attribute name index %u in class file %s",
2515 code_attribute_name_index,
2516 CHECK_NULL);
2517 if (LoadLineNumberTables &&
2518 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2519 // Parse and compress line number table
2520 parse_linenumber_table(code_attribute_length,
2521 code_length,
2522 &linenumber_table,
2523 CHECK_NULL);
2524
2525 } else if (LoadLocalVariableTables &&
2526 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2527 // Parse local variable table
2528 if (!lvt_allocated) {
2529 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2530 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2531 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2532 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2533 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2534 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2535 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2536 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2537 lvt_allocated = true;
2538 }
2539 if (lvt_cnt == max_lvt_cnt) {
2540 max_lvt_cnt <<= 1;
2541 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2542 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2543 }
2544 localvariable_table_start[lvt_cnt] =
2545 parse_localvariable_table(cfs,
2546 code_length,
2547 max_locals,
2548 code_attribute_length,
2549 &localvariable_table_length[lvt_cnt],
2550 false, // is not LVTT
2551 CHECK_NULL);
2552 total_lvt_length += localvariable_table_length[lvt_cnt];
2553 lvt_cnt++;
2554 } else if (LoadLocalVariableTypeTables &&
2555 _major_version >= JAVA_1_5_VERSION &&
2556 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2557 if (!lvt_allocated) {
2558 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2559 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2560 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2561 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2562 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2563 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2564 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2565 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2566 lvt_allocated = true;
2567 }
2568 // Parse local variable type table
2569 if (lvtt_cnt == max_lvtt_cnt) {
2570 max_lvtt_cnt <<= 1;
2571 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2572 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2573 }
2574 localvariable_type_table_start[lvtt_cnt] =
2575 parse_localvariable_table(cfs,
2576 code_length,
2577 max_locals,
2578 code_attribute_length,
2579 &localvariable_type_table_length[lvtt_cnt],
2580 true, // is LVTT
2581 CHECK_NULL);
2582 lvtt_cnt++;
2583 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2584 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2585 // Stack map is only needed by the new verifier in JDK1.5.
2586 if (parsed_stackmap_attribute) {
2587 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2588 }
2589 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2590 stackmap_data_length = code_attribute_length;
2591 parsed_stackmap_attribute = true;
2592 } else {
2593 // Skip unknown attributes
2594 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2595 }
2596 }
2597 // check method attribute length
2598 if (_need_verify) {
2599 guarantee_property(method_attribute_length == calculated_attribute_length,
2600 "Code segment has wrong length in class file %s",
2601 CHECK_NULL);
2602 }
2603 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2604 // Parse Exceptions attribute
2605 if (parsed_checked_exceptions_attribute) {
2606 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2607 CHECK_NULL);
2608 }
2609 parsed_checked_exceptions_attribute = true;
2610 checked_exceptions_start =
2611 parse_checked_exceptions(cfs,
2612 &checked_exceptions_length,
2613 method_attribute_length,
2614 CHECK_NULL);
2615 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2616 // reject multiple method parameters
2617 if (method_parameters_seen) {
2618 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2619 CHECK_NULL);
2620 }
2621 method_parameters_seen = true;
2622 method_parameters_length = cfs->get_u1_fast();
2623 const u2 real_length = (method_parameters_length * 4u) + 1u;
2624 if (method_attribute_length != real_length) {
2625 classfile_parse_error(
2626 "Invalid MethodParameters method attribute length %u in class file",
2627 method_attribute_length, CHECK_NULL);
2628 }
2629 method_parameters_data = cfs->current();
2630 cfs->skip_u2_fast(method_parameters_length);
2631 cfs->skip_u2_fast(method_parameters_length);
2632 // ignore this attribute if it cannot be reflected
2633 if (!SystemDictionary::Parameter_klass_loaded())
2634 method_parameters_length = -1;
2635 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2636 if (method_attribute_length != 0) {
2637 classfile_parse_error(
2638 "Invalid Synthetic method attribute length %u in class file %s",
2639 method_attribute_length, CHECK_NULL);
2640 }
2641 // Should we check that there hasn't already been a synthetic attribute?
2642 access_flags.set_is_synthetic();
2643 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2644 if (method_attribute_length != 0) {
2645 classfile_parse_error(
2646 "Invalid Deprecated method attribute length %u in class file %s",
2647 method_attribute_length, CHECK_NULL);
2648 }
2649 } else if (_major_version >= JAVA_1_5_VERSION) {
2650 if (method_attribute_name == vmSymbols::tag_signature()) {
2651 if (generic_signature_index != 0) {
2652 classfile_parse_error(
2653 "Multiple Signature attributes for method in class file %s",
2654 CHECK_NULL);
2655 }
2656 if (method_attribute_length != 2) {
2657 classfile_parse_error(
2658 "Invalid Signature attribute length %u in class file %s",
2659 method_attribute_length, CHECK_NULL);
2660 }
2661 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2662 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2663 if (runtime_visible_annotations != NULL) {
2664 classfile_parse_error(
2665 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2666 CHECK_NULL);
2667 }
2668 runtime_visible_annotations_length = method_attribute_length;
2669 runtime_visible_annotations = cfs->current();
2670 assert(runtime_visible_annotations != NULL, "null visible annotations");
2671 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2672 parse_annotations(cp,
2673 runtime_visible_annotations,
2674 runtime_visible_annotations_length,
2675 &parsed_annotations,
2676 _loader_data,
2677 _can_access_vm_annotations,
2678 CHECK_NULL);
2679 cfs->skip_u1_fast(runtime_visible_annotations_length);
2680 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2681 if (runtime_invisible_annotations_exists) {
2682 classfile_parse_error(
2683 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2684 CHECK_NULL);
2685 }
2686 runtime_invisible_annotations_exists = true;
2687 if (PreserveAllAnnotations) {
2688 runtime_invisible_annotations_length = method_attribute_length;
2689 runtime_invisible_annotations = cfs->current();
2690 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2691 }
2692 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2693 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2694 if (runtime_visible_parameter_annotations != NULL) {
2695 classfile_parse_error(
2696 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2697 CHECK_NULL);
2698 }
2699 runtime_visible_parameter_annotations_length = method_attribute_length;
2700 runtime_visible_parameter_annotations = cfs->current();
2701 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2702 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2703 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2704 if (runtime_invisible_parameter_annotations_exists) {
2705 classfile_parse_error(
2706 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2707 CHECK_NULL);
2708 }
2709 runtime_invisible_parameter_annotations_exists = true;
2710 if (PreserveAllAnnotations) {
2711 runtime_invisible_parameter_annotations_length = method_attribute_length;
2712 runtime_invisible_parameter_annotations = cfs->current();
2713 assert(runtime_invisible_parameter_annotations != NULL,
2714 "null invisible parameter annotations");
2715 }
2716 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2717 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2718 if (annotation_default != NULL) {
2719 classfile_parse_error(
2720 "Multiple AnnotationDefault attributes for method in class file %s",
2721 CHECK_NULL);
2722 }
2723 annotation_default_length = method_attribute_length;
2724 annotation_default = cfs->current();
2725 assert(annotation_default != NULL, "null annotation default");
2726 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2727 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2728 if (runtime_visible_type_annotations != NULL) {
2729 classfile_parse_error(
2730 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2731 CHECK_NULL);
2732 }
2733 runtime_visible_type_annotations_length = method_attribute_length;
2734 runtime_visible_type_annotations = cfs->current();
2735 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2736 // No need for the VM to parse Type annotations
2737 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2738 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2739 if (runtime_invisible_type_annotations_exists) {
2740 classfile_parse_error(
2741 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2742 CHECK_NULL);
2743 } else {
2744 runtime_invisible_type_annotations_exists = true;
2745 }
2746 if (PreserveAllAnnotations) {
2747 runtime_invisible_type_annotations_length = method_attribute_length;
2748 runtime_invisible_type_annotations = cfs->current();
2749 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2750 }
2751 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2752 } else {
2753 // Skip unknown attributes
2754 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2755 }
2756 } else {
2757 // Skip unknown attributes
2758 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2759 }
2760 }
2761
2762 if (linenumber_table != NULL) {
2763 linenumber_table->write_terminator();
2764 linenumber_table_length = linenumber_table->position();
2765 }
2766
2767 // Make sure there's at least one Code attribute in non-native/non-abstract method
2768 if (_need_verify) {
2769 guarantee_property(access_flags.is_native() ||
2770 access_flags.is_abstract() ||
2771 parsed_code_attribute,
2772 "Absent Code attribute in method that is not native or abstract in class file %s",
2773 CHECK_NULL);
2774 }
2775
2776 // All sizing information for a Method* is finally available, now create it
2777 InlineTableSizes sizes(
2778 total_lvt_length,
2779 linenumber_table_length,
2780 exception_table_length,
2781 checked_exceptions_length,
2782 method_parameters_length,
2783 generic_signature_index,
2784 runtime_visible_annotations_length +
2785 runtime_invisible_annotations_length,
2786 runtime_visible_parameter_annotations_length +
2787 runtime_invisible_parameter_annotations_length,
2788 runtime_visible_type_annotations_length +
2789 runtime_invisible_type_annotations_length,
2790 annotation_default_length,
2791 0);
2792
2793 Method* const m = Method::allocate(_loader_data,
2794 code_length,
2795 access_flags,
2796 &sizes,
2797 ConstMethod::NORMAL,
2798 CHECK_NULL);
2799
2800 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2801
2802 // Fill in information from fixed part (access_flags already set)
2803 m->set_constants(_cp);
2804 m->set_name_index(name_index);
2805 m->set_signature_index(signature_index);
2806 m->compute_from_signature(cp->symbol_at(signature_index));
2807 assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2808
2809 // Fill in code attribute information
2810 m->set_max_stack(max_stack);
2811 m->set_max_locals(max_locals);
2812 if (stackmap_data != NULL) {
2813 m->constMethod()->copy_stackmap_data(_loader_data,
2814 (u1*)stackmap_data,
2815 stackmap_data_length,
2816 CHECK_NULL);
2817 }
2818
2819 // Copy byte codes
2820 m->set_code((u1*)code_start);
2821
2822 // Copy line number table
2823 if (linenumber_table != NULL) {
2824 memcpy(m->compressed_linenumber_table(),
2825 linenumber_table->buffer(),
2826 linenumber_table_length);
2827 }
2828
2829 // Copy exception table
2830 if (exception_table_length > 0) {
2831 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2832 m->exception_table_start(),
2833 exception_table_length * sizeof(ExceptionTableElement),
2834 sizeof(u2));
2835 }
2836
2837 // Copy method parameters
2838 if (method_parameters_length > 0) {
2839 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2840 for (int i = 0; i < method_parameters_length; i++) {
2841 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2842 method_parameters_data += 2;
2843 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2844 method_parameters_data += 2;
2845 }
2846 }
2847
2848 // Copy checked exceptions
2849 if (checked_exceptions_length > 0) {
2850 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2851 m->checked_exceptions_start(),
2852 checked_exceptions_length * sizeof(CheckedExceptionElement),
2853 sizeof(u2));
2854 }
2855
2856 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2857 if (total_lvt_length > 0) {
2858 promoted_flags->set_has_localvariable_table();
2859 copy_localvariable_table(m->constMethod(),
2860 lvt_cnt,
2861 localvariable_table_length,
2862 localvariable_table_start,
2863 lvtt_cnt,
2864 localvariable_type_table_length,
2865 localvariable_type_table_start,
2866 CHECK_NULL);
2867 }
2868
2869 if (parsed_annotations.has_any_annotations())
2870 parsed_annotations.apply_to(methodHandle(THREAD, m));
2871
2872 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2873 m->set_hidden(true);
2874 }
2875
2876 // Copy annotations
2877 copy_method_annotations(m->constMethod(),
2878 runtime_visible_annotations,
2879 runtime_visible_annotations_length,
2880 runtime_invisible_annotations,
2881 runtime_invisible_annotations_length,
2882 runtime_visible_parameter_annotations,
2883 runtime_visible_parameter_annotations_length,
2884 runtime_invisible_parameter_annotations,
2885 runtime_invisible_parameter_annotations_length,
2886 runtime_visible_type_annotations,
2887 runtime_visible_type_annotations_length,
2888 runtime_invisible_type_annotations,
2889 runtime_invisible_type_annotations_length,
2890 annotation_default,
2891 annotation_default_length,
2892 CHECK_NULL);
2893
2894 if (name == vmSymbols::finalize_method_name() &&
2895 signature == vmSymbols::void_method_signature()) {
2896 if (m->is_empty_method()) {
2897 _has_empty_finalizer = true;
2898 } else {
2899 _has_finalizer = true;
2900 }
2901 }
2902 if (name == vmSymbols::object_initializer_name() &&
2903 signature == vmSymbols::void_method_signature() &&
2904 m->is_vanilla_constructor()) {
2905 _has_vanilla_constructor = true;
2906 }
2907
2908 NOT_PRODUCT(m->verify());
2909 return m;
2910 }
2911
2912
2913 // The promoted_flags parameter is used to pass relevant access_flags
2914 // from the methods back up to the containing klass. These flag values
2915 // are added to klass's access_flags.
2916 // Side-effects: populates the _methods field in the parser
parse_methods(const ClassFileStream * const cfs,bool is_interface,AccessFlags * promoted_flags,bool * has_final_method,bool * declares_nonstatic_concrete_methods,TRAPS)2917 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2918 bool is_interface,
2919 AccessFlags* promoted_flags,
2920 bool* has_final_method,
2921 bool* declares_nonstatic_concrete_methods,
2922 TRAPS) {
2923 assert(cfs != NULL, "invariant");
2924 assert(promoted_flags != NULL, "invariant");
2925 assert(has_final_method != NULL, "invariant");
2926 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2927
2928 assert(NULL == _methods, "invariant");
2929
2930 cfs->guarantee_more(2, CHECK); // length
2931 const u2 length = cfs->get_u2_fast();
2932 if (length == 0) {
2933 _methods = Universe::the_empty_method_array();
2934 } else {
2935 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2936 length,
2937 NULL,
2938 CHECK);
2939
2940 for (int index = 0; index < length; index++) {
2941 Method* method = parse_method(cfs,
2942 is_interface,
2943 _cp,
2944 promoted_flags,
2945 CHECK);
2946
2947 if (method->is_final()) {
2948 *has_final_method = true;
2949 }
2950 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2951 // used for interface initialization, and default method inheritance analysis
2952 if (is_interface && !(*declares_nonstatic_concrete_methods)
2953 && !method->is_abstract() && !method->is_static()) {
2954 *declares_nonstatic_concrete_methods = true;
2955 }
2956 _methods->at_put(index, method);
2957 }
2958
2959 if (_need_verify && length > 1) {
2960 // Check duplicated methods
2961 ResourceMark rm(THREAD);
2962 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2963 THREAD, NameSigHash*, HASH_ROW_SIZE);
2964 initialize_hashtable(names_and_sigs);
2965 bool dup = false;
2966 const Symbol* name = NULL;
2967 const Symbol* sig = NULL;
2968 {
2969 debug_only(NoSafepointVerifier nsv;)
2970 for (int i = 0; i < length; i++) {
2971 const Method* const m = _methods->at(i);
2972 name = m->name();
2973 sig = m->signature();
2974 // If no duplicates, add name/signature in hashtable names_and_sigs.
2975 if (!put_after_lookup(name, sig, names_and_sigs)) {
2976 dup = true;
2977 break;
2978 }
2979 }
2980 }
2981 if (dup) {
2982 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2983 name->as_C_string(), sig->as_klass_external_name(), CHECK);
2984 }
2985 }
2986 }
2987 }
2988
sort_methods(Array<Method * > * methods)2989 static const intArray* sort_methods(Array<Method*>* methods) {
2990 const int length = methods->length();
2991 // If JVMTI original method ordering or sharing is enabled we have to
2992 // remember the original class file ordering.
2993 // We temporarily use the vtable_index field in the Method* to store the
2994 // class file index, so we can read in after calling qsort.
2995 // Put the method ordering in the shared archive.
2996 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) {
2997 for (int index = 0; index < length; index++) {
2998 Method* const m = methods->at(index);
2999 assert(!m->valid_vtable_index(), "vtable index should not be set");
3000 m->set_vtable_index(index);
3001 }
3002 }
3003 // Sort method array by ascending method name (for faster lookups & vtable construction)
3004 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3005 Method::sort_methods(methods);
3006
3007 intArray* method_ordering = NULL;
3008 // If JVMTI original method ordering or sharing is enabled construct int
3009 // array remembering the original ordering
3010 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) {
3011 method_ordering = new intArray(length, length, -1);
3012 for (int index = 0; index < length; index++) {
3013 Method* const m = methods->at(index);
3014 const int old_index = m->vtable_index();
3015 assert(old_index >= 0 && old_index < length, "invalid method index");
3016 method_ordering->at_put(index, old_index);
3017 m->set_vtable_index(Method::invalid_vtable_index);
3018 }
3019 }
3020 return method_ordering;
3021 }
3022
3023 // Parse generic_signature attribute for methods and fields
parse_generic_signature_attribute(const ClassFileStream * const cfs,TRAPS)3024 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3025 TRAPS) {
3026 assert(cfs != NULL, "invariant");
3027
3028 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3029 const u2 generic_signature_index = cfs->get_u2_fast();
3030 check_property(
3031 valid_symbol_at(generic_signature_index),
3032 "Invalid Signature attribute at constant pool index %u in class file %s",
3033 generic_signature_index, CHECK_0);
3034 return generic_signature_index;
3035 }
3036
parse_classfile_sourcefile_attribute(const ClassFileStream * const cfs,TRAPS)3037 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3038 TRAPS) {
3039
3040 assert(cfs != NULL, "invariant");
3041
3042 cfs->guarantee_more(2, CHECK); // sourcefile_index
3043 const u2 sourcefile_index = cfs->get_u2_fast();
3044 check_property(
3045 valid_symbol_at(sourcefile_index),
3046 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3047 sourcefile_index, CHECK);
3048 set_class_sourcefile_index(sourcefile_index);
3049 }
3050
parse_classfile_source_debug_extension_attribute(const ClassFileStream * const cfs,int length,TRAPS)3051 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3052 int length,
3053 TRAPS) {
3054 assert(cfs != NULL, "invariant");
3055
3056 const u1* const sde_buffer = cfs->current();
3057 assert(sde_buffer != NULL, "null sde buffer");
3058
3059 // Don't bother storing it if there is no way to retrieve it
3060 if (JvmtiExport::can_get_source_debug_extension()) {
3061 assert((length+1) > length, "Overflow checking");
3062 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3063 for (int i = 0; i < length; i++) {
3064 sde[i] = sde_buffer[i];
3065 }
3066 sde[length] = '\0';
3067 set_class_sde_buffer((const char*)sde, length);
3068 }
3069 // Got utf8 string, set stream position forward
3070 cfs->skip_u1(length, CHECK);
3071 }
3072
3073
3074 // Inner classes can be static, private or protected (classic VM does this)
3075 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3076 JVM_ACC_PRIVATE | \
3077 JVM_ACC_PROTECTED | \
3078 JVM_ACC_STATIC \
3079 )
3080
3081 // Find index of the InnerClasses entry for the specified inner_class_info_index.
3082 // Return -1 if none is found.
inner_classes_find_index(const Array<u2> * inner_classes,int inner,const ConstantPool * cp,int length)3083 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
3084 Symbol* cp_klass_name = cp->klass_name_at(inner);
3085 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
3086 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
3087 if (cp->klass_name_at(idx_inner) == cp_klass_name) {
3088 return idx;
3089 }
3090 }
3091 return -1;
3092 }
3093
3094 // Return the outer_class_info_index for the InnerClasses entry containing the
3095 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found.
inner_classes_jump_to_outer(const Array<u2> * inner_classes,int inner,const ConstantPool * cp,int length)3096 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
3097 if (inner == 0) return -1;
3098 int idx = inner_classes_find_index(inner_classes, inner, cp, length);
3099 if (idx == -1) return -1;
3100 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
3101 return result;
3102 }
3103
3104 // Return true if circularity is found, false if no circularity is found.
3105 // Use Floyd's cycle finding algorithm.
inner_classes_check_loop_through_outer(const Array<u2> * inner_classes,int idx,const ConstantPool * cp,int length)3106 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
3107 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
3108 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
3109 while (fast != -1 && fast != 0) {
3110 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
3111 return true; // found a circularity
3112 }
3113 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3114 if (fast == -1) return false;
3115 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3116 if (fast == -1) return false;
3117 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
3118 assert(slow != -1, "sanity check");
3119 }
3120 return false;
3121 }
3122
3123 // Loop through each InnerClasses entry checking for circularities and duplications
3124 // with other entries. If duplicate entries are found then throw CFE. Otherwise,
3125 // return true if a circularity or entries with duplicate inner_class_info_indexes
3126 // are found.
check_inner_classes_circularity(const ConstantPool * cp,int length,TRAPS)3127 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
3128 // Loop through each InnerClasses entry.
3129 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
3130 // Return true if there are circular entries.
3131 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
3132 return true;
3133 }
3134 // Check if there are duplicate entries or entries with the same inner_class_info_index.
3135 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
3136 y += InstanceKlass::inner_class_next_offset) {
3137
3138 // To maintain compatibility, throw an exception if duplicate inner classes
3139 // entries are found.
3140 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
3141 _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
3142 _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
3143 _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
3144 "Duplicate entry in InnerClasses attribute in class file %s",
3145 CHECK_(true));
3146 // Return true if there are two entries with the same inner_class_info_index.
3147 if (_inner_classes->at(y) == _inner_classes->at(idx)) {
3148 return true;
3149 }
3150 }
3151 }
3152 return false;
3153 }
3154
3155 // Return number of classes in the inner classes attribute table
parse_classfile_inner_classes_attribute(const ClassFileStream * const cfs,const ConstantPool * cp,const u1 * const inner_classes_attribute_start,bool parsed_enclosingmethod_attribute,u2 enclosing_method_class_index,u2 enclosing_method_method_index,TRAPS)3156 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3157 const ConstantPool* cp,
3158 const u1* const inner_classes_attribute_start,
3159 bool parsed_enclosingmethod_attribute,
3160 u2 enclosing_method_class_index,
3161 u2 enclosing_method_method_index,
3162 TRAPS) {
3163 const u1* const current_mark = cfs->current();
3164 u2 length = 0;
3165 if (inner_classes_attribute_start != NULL) {
3166 cfs->set_current(inner_classes_attribute_start);
3167 cfs->guarantee_more(2, CHECK_0); // length
3168 length = cfs->get_u2_fast();
3169 }
3170
3171 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3172 // method data:
3173 // [inner_class_info_index,
3174 // outer_class_info_index,
3175 // inner_name_index,
3176 // inner_class_access_flags,
3177 // ...
3178 // enclosing_method_class_index,
3179 // enclosing_method_method_index]
3180 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3181 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3182 _inner_classes = inner_classes;
3183
3184 int index = 0;
3185 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3186 for (int n = 0; n < length; n++) {
3187 // Inner class index
3188 const u2 inner_class_info_index = cfs->get_u2_fast();
3189 check_property(
3190 valid_klass_reference_at(inner_class_info_index),
3191 "inner_class_info_index %u has bad constant type in class file %s",
3192 inner_class_info_index, CHECK_0);
3193 // Outer class index
3194 const u2 outer_class_info_index = cfs->get_u2_fast();
3195 check_property(
3196 outer_class_info_index == 0 ||
3197 valid_klass_reference_at(outer_class_info_index),
3198 "outer_class_info_index %u has bad constant type in class file %s",
3199 outer_class_info_index, CHECK_0);
3200
3201 if (outer_class_info_index != 0) {
3202 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3203 char* bytes = (char*)outer_class_name->bytes();
3204 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3205 "Outer class is an array class in class file %s", CHECK_0);
3206 }
3207 // Inner class name
3208 const u2 inner_name_index = cfs->get_u2_fast();
3209 check_property(
3210 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3211 "inner_name_index %u has bad constant type in class file %s",
3212 inner_name_index, CHECK_0);
3213 if (_need_verify) {
3214 guarantee_property(inner_class_info_index != outer_class_info_index,
3215 "Class is both outer and inner class in class file %s", CHECK_0);
3216 }
3217 // Access flags
3218 jint flags;
3219 // JVM_ACC_MODULE is defined in JDK-9 and later.
3220 if (_major_version >= JAVA_9_VERSION) {
3221 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3222 } else {
3223 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3224 }
3225 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3226 // Set abstract bit for old class files for backward compatibility
3227 flags |= JVM_ACC_ABSTRACT;
3228 }
3229 verify_legal_class_modifiers(flags, CHECK_0);
3230 AccessFlags inner_access_flags(flags);
3231
3232 inner_classes->at_put(index++, inner_class_info_index);
3233 inner_classes->at_put(index++, outer_class_info_index);
3234 inner_classes->at_put(index++, inner_name_index);
3235 inner_classes->at_put(index++, inner_access_flags.as_short());
3236 }
3237
3238 // 4347400: make sure there's no duplicate entry in the classes array
3239 // Also, check for circular entries.
3240 bool has_circularity = false;
3241 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3242 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3243 if (has_circularity) {
3244 // If circularity check failed then ignore InnerClasses attribute.
3245 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3246 index = 0;
3247 if (parsed_enclosingmethod_attribute) {
3248 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3249 _inner_classes = inner_classes;
3250 } else {
3251 _inner_classes = Universe::the_empty_short_array();
3252 }
3253 }
3254 }
3255 // Set EnclosingMethod class and method indexes.
3256 if (parsed_enclosingmethod_attribute) {
3257 inner_classes->at_put(index++, enclosing_method_class_index);
3258 inner_classes->at_put(index++, enclosing_method_method_index);
3259 }
3260 assert(index == size || has_circularity, "wrong size");
3261
3262 // Restore buffer's current position.
3263 cfs->set_current(current_mark);
3264
3265 return length;
3266 }
3267
parse_classfile_nest_members_attribute(const ClassFileStream * const cfs,const u1 * const nest_members_attribute_start,TRAPS)3268 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3269 const u1* const nest_members_attribute_start,
3270 TRAPS) {
3271 const u1* const current_mark = cfs->current();
3272 u2 length = 0;
3273 if (nest_members_attribute_start != NULL) {
3274 cfs->set_current(nest_members_attribute_start);
3275 cfs->guarantee_more(2, CHECK_0); // length
3276 length = cfs->get_u2_fast();
3277 }
3278 const int size = length;
3279 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3280 _nest_members = nest_members;
3281
3282 int index = 0;
3283 cfs->guarantee_more(2 * length, CHECK_0);
3284 for (int n = 0; n < length; n++) {
3285 const u2 class_info_index = cfs->get_u2_fast();
3286 check_property(
3287 valid_klass_reference_at(class_info_index),
3288 "Nest member class_info_index %u has bad constant type in class file %s",
3289 class_info_index, CHECK_0);
3290 nest_members->at_put(index++, class_info_index);
3291 }
3292 assert(index == size, "wrong size");
3293
3294 // Restore buffer's current position.
3295 cfs->set_current(current_mark);
3296
3297 return length;
3298 }
3299
parse_classfile_permitted_subclasses_attribute(const ClassFileStream * const cfs,const u1 * const permitted_subclasses_attribute_start,TRAPS)3300 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3301 const u1* const permitted_subclasses_attribute_start,
3302 TRAPS) {
3303 const u1* const current_mark = cfs->current();
3304 u2 length = 0;
3305 if (permitted_subclasses_attribute_start != NULL) {
3306 cfs->set_current(permitted_subclasses_attribute_start);
3307 cfs->guarantee_more(2, CHECK_0); // length
3308 length = cfs->get_u2_fast();
3309 }
3310 if (length < 1) {
3311 classfile_parse_error("PermittedSubclasses attribute is empty in class file %s", CHECK_0);
3312 }
3313 const int size = length;
3314 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3315 _permitted_subclasses = permitted_subclasses;
3316
3317 int index = 0;
3318 cfs->guarantee_more(2 * length, CHECK_0);
3319 for (int n = 0; n < length; n++) {
3320 const u2 class_info_index = cfs->get_u2_fast();
3321 check_property(
3322 valid_klass_reference_at(class_info_index),
3323 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3324 class_info_index, CHECK_0);
3325 permitted_subclasses->at_put(index++, class_info_index);
3326 }
3327 assert(index == size, "wrong size");
3328
3329 // Restore buffer's current position.
3330 cfs->set_current(current_mark);
3331
3332 return length;
3333 }
3334
3335 // Record {
3336 // u2 attribute_name_index;
3337 // u4 attribute_length;
3338 // u2 components_count;
3339 // component_info components[components_count];
3340 // }
3341 // component_info {
3342 // u2 name_index;
3343 // u2 descriptor_index
3344 // u2 attributes_count;
3345 // attribute_info_attributes[attributes_count];
3346 // }
parse_classfile_record_attribute(const ClassFileStream * const cfs,const ConstantPool * cp,const u1 * const record_attribute_start,TRAPS)3347 u2 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3348 const ConstantPool* cp,
3349 const u1* const record_attribute_start,
3350 TRAPS) {
3351 const u1* const current_mark = cfs->current();
3352 int components_count = 0;
3353 unsigned int calculate_attr_size = 0;
3354 if (record_attribute_start != NULL) {
3355 cfs->set_current(record_attribute_start);
3356 cfs->guarantee_more(2, CHECK_0); // num of components
3357 components_count = (int)cfs->get_u2_fast();
3358 calculate_attr_size = 2;
3359 }
3360
3361 Array<RecordComponent*>* const record_components =
3362 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, NULL, CHECK_0);
3363 _record_components = record_components;
3364
3365 for (int x = 0; x < components_count; x++) {
3366 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3367
3368 const u2 name_index = cfs->get_u2_fast();
3369 check_property(valid_symbol_at(name_index),
3370 "Invalid constant pool index %u for name in Record attribute in class file %s",
3371 name_index, CHECK_0);
3372 const Symbol* const name = cp->symbol_at(name_index);
3373 verify_legal_field_name(name, CHECK_0);
3374
3375 const u2 descriptor_index = cfs->get_u2_fast();
3376 check_property(valid_symbol_at(descriptor_index),
3377 "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3378 descriptor_index, CHECK_0);
3379 const Symbol* const descr = cp->symbol_at(descriptor_index);
3380 verify_legal_field_signature(name, descr, CHECK_0);
3381
3382 const u2 attributes_count = cfs->get_u2_fast();
3383 calculate_attr_size += 6;
3384 u2 generic_sig_index = 0;
3385 const u1* runtime_visible_annotations = NULL;
3386 int runtime_visible_annotations_length = 0;
3387 const u1* runtime_invisible_annotations = NULL;
3388 int runtime_invisible_annotations_length = 0;
3389 bool runtime_invisible_annotations_exists = false;
3390 const u1* runtime_visible_type_annotations = NULL;
3391 int runtime_visible_type_annotations_length = 0;
3392 const u1* runtime_invisible_type_annotations = NULL;
3393 int runtime_invisible_type_annotations_length = 0;
3394 bool runtime_invisible_type_annotations_exists = false;
3395
3396 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3397 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
3398 for (int y = 0; y < attributes_count; y++) {
3399 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
3400 const u2 attribute_name_index = cfs->get_u2_fast();
3401 const u4 attribute_length = cfs->get_u4_fast();
3402 calculate_attr_size += 6;
3403 check_property(
3404 valid_symbol_at(attribute_name_index),
3405 "Invalid Record attribute name index %u in class file %s",
3406 attribute_name_index, CHECK_0);
3407
3408 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3409 if (attribute_name == vmSymbols::tag_signature()) {
3410 if (generic_sig_index != 0) {
3411 classfile_parse_error(
3412 "Multiple Signature attributes for Record component in class file %s",
3413 CHECK_0);
3414 }
3415 if (attribute_length != 2) {
3416 classfile_parse_error(
3417 "Invalid Signature attribute length %u in Record component in class file %s",
3418 attribute_length, CHECK_0);
3419 }
3420 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3421
3422 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3423 if (runtime_visible_annotations != NULL) {
3424 classfile_parse_error(
3425 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", CHECK_0);
3426 }
3427 runtime_visible_annotations_length = attribute_length;
3428 runtime_visible_annotations = cfs->current();
3429
3430 assert(runtime_visible_annotations != NULL, "null record component visible annotation");
3431 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3432 cfs->skip_u1_fast(runtime_visible_annotations_length);
3433
3434 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3435 if (runtime_invisible_annotations_exists) {
3436 classfile_parse_error(
3437 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", CHECK_0);
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 record component invisible annotation");
3444 }
3445 cfs->skip_u1(attribute_length, CHECK_0);
3446
3447 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3448 if (runtime_visible_type_annotations != NULL) {
3449 classfile_parse_error(
3450 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", CHECK_0);
3451 }
3452 runtime_visible_type_annotations_length = attribute_length;
3453 runtime_visible_type_annotations = cfs->current();
3454
3455 assert(runtime_visible_type_annotations != NULL, "null record component visible type annotation");
3456 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3457 cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3458
3459 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3460 if (runtime_invisible_type_annotations_exists) {
3461 classfile_parse_error(
3462 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", CHECK_0);
3463 }
3464 runtime_invisible_type_annotations_exists = true;
3465 if (PreserveAllAnnotations) {
3466 runtime_invisible_type_annotations_length = attribute_length;
3467 runtime_invisible_type_annotations = cfs->current();
3468 assert(runtime_invisible_type_annotations != NULL, "null record component invisible type annotation");
3469 }
3470 cfs->skip_u1(attribute_length, CHECK_0);
3471
3472 } else {
3473 // Skip unknown attributes
3474 cfs->skip_u1(attribute_length, CHECK_0);
3475 }
3476 calculate_attr_size += attribute_length;
3477 } // End of attributes For loop
3478
3479 AnnotationArray* annotations = assemble_annotations(runtime_visible_annotations,
3480 runtime_visible_annotations_length,
3481 runtime_invisible_annotations,
3482 runtime_invisible_annotations_length,
3483 CHECK_0);
3484 AnnotationArray* type_annotations = assemble_annotations(runtime_visible_type_annotations,
3485 runtime_visible_type_annotations_length,
3486 runtime_invisible_type_annotations,
3487 runtime_invisible_type_annotations_length,
3488 CHECK_0);
3489
3490 RecordComponent* record_component =
3491 RecordComponent::allocate(_loader_data, name_index, descriptor_index,
3492 attributes_count, generic_sig_index,
3493 annotations, type_annotations, CHECK_0);
3494 record_components->at_put(x, record_component);
3495 } // End of component processing loop
3496
3497 // Restore buffer's current position.
3498 cfs->set_current(current_mark);
3499 return calculate_attr_size;
3500 }
3501
parse_classfile_synthetic_attribute(TRAPS)3502 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3503 set_class_synthetic_flag(true);
3504 }
3505
parse_classfile_signature_attribute(const ClassFileStream * const cfs,TRAPS)3506 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3507 assert(cfs != NULL, "invariant");
3508
3509 const u2 signature_index = cfs->get_u2(CHECK);
3510 check_property(
3511 valid_symbol_at(signature_index),
3512 "Invalid constant pool index %u in Signature attribute in class file %s",
3513 signature_index, CHECK);
3514 set_class_generic_signature_index(signature_index);
3515 }
3516
parse_classfile_bootstrap_methods_attribute(const ClassFileStream * const cfs,ConstantPool * cp,u4 attribute_byte_length,TRAPS)3517 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3518 ConstantPool* cp,
3519 u4 attribute_byte_length,
3520 TRAPS) {
3521 assert(cfs != NULL, "invariant");
3522 assert(cp != NULL, "invariant");
3523
3524 const u1* const current_start = cfs->current();
3525
3526 guarantee_property(attribute_byte_length >= sizeof(u2),
3527 "Invalid BootstrapMethods attribute length %u in class file %s",
3528 attribute_byte_length,
3529 CHECK);
3530
3531 cfs->guarantee_more(attribute_byte_length, CHECK);
3532
3533 const int attribute_array_length = cfs->get_u2_fast();
3534
3535 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3536 "Short length on BootstrapMethods in class file %s",
3537 CHECK);
3538
3539
3540 // The attribute contains a counted array of counted tuples of shorts,
3541 // represending bootstrap specifiers:
3542 // length*{bootstrap_method_index, argument_count*{argument_index}}
3543 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3544 // operand_count = number of shorts in attr, except for leading length
3545
3546 // The attribute is copied into a short[] array.
3547 // The array begins with a series of short[2] pairs, one for each tuple.
3548 const int index_size = (attribute_array_length * 2);
3549
3550 Array<u2>* const operands =
3551 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3552
3553 // Eagerly assign operands so they will be deallocated with the constant
3554 // pool if there is an error.
3555 cp->set_operands(operands);
3556
3557 int operand_fill_index = index_size;
3558 const int cp_size = cp->length();
3559
3560 for (int n = 0; n < attribute_array_length; n++) {
3561 // Store a 32-bit offset into the header of the operand array.
3562 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3563
3564 // Read a bootstrap specifier.
3565 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3566 const u2 bootstrap_method_index = cfs->get_u2_fast();
3567 const u2 argument_count = cfs->get_u2_fast();
3568 check_property(
3569 valid_cp_range(bootstrap_method_index, cp_size) &&
3570 cp->tag_at(bootstrap_method_index).is_method_handle(),
3571 "bootstrap_method_index %u has bad constant type in class file %s",
3572 bootstrap_method_index,
3573 CHECK);
3574
3575 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3576 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3577 CHECK);
3578
3579 operands->at_put(operand_fill_index++, bootstrap_method_index);
3580 operands->at_put(operand_fill_index++, argument_count);
3581
3582 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3583 for (int j = 0; j < argument_count; j++) {
3584 const u2 argument_index = cfs->get_u2_fast();
3585 check_property(
3586 valid_cp_range(argument_index, cp_size) &&
3587 cp->tag_at(argument_index).is_loadable_constant(),
3588 "argument_index %u has bad constant type in class file %s",
3589 argument_index,
3590 CHECK);
3591 operands->at_put(operand_fill_index++, argument_index);
3592 }
3593 }
3594 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3595 "Bad length on BootstrapMethods in class file %s",
3596 CHECK);
3597 }
3598
supports_sealed_types()3599 bool ClassFileParser::supports_sealed_types() {
3600 return _major_version == JVM_CLASSFILE_MAJOR_VERSION &&
3601 _minor_version == JAVA_PREVIEW_MINOR_VERSION &&
3602 Arguments::enable_preview();
3603 }
3604
supports_records()3605 bool ClassFileParser::supports_records() {
3606 return _major_version == JVM_CLASSFILE_MAJOR_VERSION &&
3607 _minor_version == JAVA_PREVIEW_MINOR_VERSION &&
3608 Arguments::enable_preview();
3609 }
3610
parse_classfile_attributes(const ClassFileStream * const cfs,ConstantPool * cp,ClassFileParser::ClassAnnotationCollector * parsed_annotations,TRAPS)3611 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3612 ConstantPool* cp,
3613 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3614 TRAPS) {
3615 assert(cfs != NULL, "invariant");
3616 assert(cp != NULL, "invariant");
3617 assert(parsed_annotations != NULL, "invariant");
3618
3619 // Set inner classes attribute to default sentinel
3620 _inner_classes = Universe::the_empty_short_array();
3621 // Set nest members attribute to default sentinel
3622 _nest_members = Universe::the_empty_short_array();
3623 // Set _permitted_subclasses attribute to default sentinel
3624 _permitted_subclasses = Universe::the_empty_short_array();
3625 cfs->guarantee_more(2, CHECK); // attributes_count
3626 u2 attributes_count = cfs->get_u2_fast();
3627 bool parsed_sourcefile_attribute = false;
3628 bool parsed_innerclasses_attribute = false;
3629 bool parsed_nest_members_attribute = false;
3630 bool parsed_permitted_subclasses_attribute = false;
3631 bool parsed_nest_host_attribute = false;
3632 bool parsed_record_attribute = false;
3633 bool parsed_enclosingmethod_attribute = false;
3634 bool parsed_bootstrap_methods_attribute = false;
3635 const u1* runtime_visible_annotations = NULL;
3636 int runtime_visible_annotations_length = 0;
3637 const u1* runtime_invisible_annotations = NULL;
3638 int runtime_invisible_annotations_length = 0;
3639 const u1* runtime_visible_type_annotations = NULL;
3640 int runtime_visible_type_annotations_length = 0;
3641 const u1* runtime_invisible_type_annotations = NULL;
3642 int runtime_invisible_type_annotations_length = 0;
3643 bool runtime_invisible_type_annotations_exists = false;
3644 bool runtime_invisible_annotations_exists = false;
3645 bool parsed_source_debug_ext_annotations_exist = false;
3646 const u1* inner_classes_attribute_start = NULL;
3647 u4 inner_classes_attribute_length = 0;
3648 u2 enclosing_method_class_index = 0;
3649 u2 enclosing_method_method_index = 0;
3650 const u1* nest_members_attribute_start = NULL;
3651 u4 nest_members_attribute_length = 0;
3652 const u1* record_attribute_start = NULL;
3653 u4 record_attribute_length = 0;
3654 const u1* permitted_subclasses_attribute_start = NULL;
3655 u4 permitted_subclasses_attribute_length = 0;
3656
3657 // Iterate over attributes
3658 while (attributes_count--) {
3659 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3660 const u2 attribute_name_index = cfs->get_u2_fast();
3661 const u4 attribute_length = cfs->get_u4_fast();
3662 check_property(
3663 valid_symbol_at(attribute_name_index),
3664 "Attribute name has bad constant pool index %u in class file %s",
3665 attribute_name_index, CHECK);
3666 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3667 if (tag == vmSymbols::tag_source_file()) {
3668 // Check for SourceFile tag
3669 if (_need_verify) {
3670 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3671 }
3672 if (parsed_sourcefile_attribute) {
3673 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3674 } else {
3675 parsed_sourcefile_attribute = true;
3676 }
3677 parse_classfile_sourcefile_attribute(cfs, CHECK);
3678 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3679 // Check for SourceDebugExtension tag
3680 if (parsed_source_debug_ext_annotations_exist) {
3681 classfile_parse_error(
3682 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3683 }
3684 parsed_source_debug_ext_annotations_exist = true;
3685 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3686 } else if (tag == vmSymbols::tag_inner_classes()) {
3687 // Check for InnerClasses tag
3688 if (parsed_innerclasses_attribute) {
3689 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3690 } else {
3691 parsed_innerclasses_attribute = true;
3692 }
3693 inner_classes_attribute_start = cfs->current();
3694 inner_classes_attribute_length = attribute_length;
3695 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3696 } else if (tag == vmSymbols::tag_synthetic()) {
3697 // Check for Synthetic tag
3698 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3699 if (attribute_length != 0) {
3700 classfile_parse_error(
3701 "Invalid Synthetic classfile attribute length %u in class file %s",
3702 attribute_length, CHECK);
3703 }
3704 parse_classfile_synthetic_attribute(CHECK);
3705 } else if (tag == vmSymbols::tag_deprecated()) {
3706 // Check for Deprecatd tag - 4276120
3707 if (attribute_length != 0) {
3708 classfile_parse_error(
3709 "Invalid Deprecated classfile attribute length %u in class file %s",
3710 attribute_length, CHECK);
3711 }
3712 } else if (_major_version >= JAVA_1_5_VERSION) {
3713 if (tag == vmSymbols::tag_signature()) {
3714 if (_generic_signature_index != 0) {
3715 classfile_parse_error(
3716 "Multiple Signature attributes in class file %s", CHECK);
3717 }
3718 if (attribute_length != 2) {
3719 classfile_parse_error(
3720 "Wrong Signature attribute length %u in class file %s",
3721 attribute_length, CHECK);
3722 }
3723 parse_classfile_signature_attribute(cfs, CHECK);
3724 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3725 if (runtime_visible_annotations != NULL) {
3726 classfile_parse_error(
3727 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3728 }
3729 runtime_visible_annotations_length = attribute_length;
3730 runtime_visible_annotations = cfs->current();
3731 assert(runtime_visible_annotations != NULL, "null visible annotations");
3732 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3733 parse_annotations(cp,
3734 runtime_visible_annotations,
3735 runtime_visible_annotations_length,
3736 parsed_annotations,
3737 _loader_data,
3738 _can_access_vm_annotations,
3739 CHECK);
3740 cfs->skip_u1_fast(runtime_visible_annotations_length);
3741 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3742 if (runtime_invisible_annotations_exists) {
3743 classfile_parse_error(
3744 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3745 }
3746 runtime_invisible_annotations_exists = true;
3747 if (PreserveAllAnnotations) {
3748 runtime_invisible_annotations_length = attribute_length;
3749 runtime_invisible_annotations = cfs->current();
3750 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3751 }
3752 cfs->skip_u1(attribute_length, CHECK);
3753 } else if (tag == vmSymbols::tag_enclosing_method()) {
3754 if (parsed_enclosingmethod_attribute) {
3755 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3756 } else {
3757 parsed_enclosingmethod_attribute = true;
3758 }
3759 guarantee_property(attribute_length == 4,
3760 "Wrong EnclosingMethod attribute length %u in class file %s",
3761 attribute_length, CHECK);
3762 cfs->guarantee_more(4, CHECK); // class_index, method_index
3763 enclosing_method_class_index = cfs->get_u2_fast();
3764 enclosing_method_method_index = cfs->get_u2_fast();
3765 if (enclosing_method_class_index == 0) {
3766 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3767 }
3768 // Validate the constant pool indices and types
3769 check_property(valid_klass_reference_at(enclosing_method_class_index),
3770 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3771 if (enclosing_method_method_index != 0 &&
3772 (!cp->is_within_bounds(enclosing_method_method_index) ||
3773 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3774 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3775 }
3776 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3777 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3778 if (parsed_bootstrap_methods_attribute) {
3779 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3780 }
3781 parsed_bootstrap_methods_attribute = true;
3782 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3783 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3784 if (runtime_visible_type_annotations != NULL) {
3785 classfile_parse_error(
3786 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3787 }
3788 runtime_visible_type_annotations_length = attribute_length;
3789 runtime_visible_type_annotations = cfs->current();
3790 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3791 // No need for the VM to parse Type annotations
3792 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3793 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3794 if (runtime_invisible_type_annotations_exists) {
3795 classfile_parse_error(
3796 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3797 } else {
3798 runtime_invisible_type_annotations_exists = true;
3799 }
3800 if (PreserveAllAnnotations) {
3801 runtime_invisible_type_annotations_length = attribute_length;
3802 runtime_invisible_type_annotations = cfs->current();
3803 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3804 }
3805 cfs->skip_u1(attribute_length, CHECK);
3806 } else if (_major_version >= JAVA_11_VERSION) {
3807 if (tag == vmSymbols::tag_nest_members()) {
3808 // Check for NestMembers tag
3809 if (parsed_nest_members_attribute) {
3810 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK);
3811 } else {
3812 parsed_nest_members_attribute = true;
3813 }
3814 if (parsed_nest_host_attribute) {
3815 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK);
3816 }
3817 nest_members_attribute_start = cfs->current();
3818 nest_members_attribute_length = attribute_length;
3819 cfs->skip_u1(nest_members_attribute_length, CHECK);
3820 } else if (tag == vmSymbols::tag_nest_host()) {
3821 if (parsed_nest_host_attribute) {
3822 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK);
3823 } else {
3824 parsed_nest_host_attribute = true;
3825 }
3826 if (parsed_nest_members_attribute) {
3827 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK);
3828 }
3829 if (_need_verify) {
3830 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3831 }
3832 cfs->guarantee_more(2, CHECK);
3833 u2 class_info_index = cfs->get_u2_fast();
3834 check_property(
3835 valid_klass_reference_at(class_info_index),
3836 "Nest-host class_info_index %u has bad constant type in class file %s",
3837 class_info_index, CHECK);
3838 _nest_host = class_info_index;
3839 } else if (_major_version >= JAVA_14_VERSION) {
3840 if (tag == vmSymbols::tag_record()) {
3841 // Skip over Record attribute if not supported or if super class is
3842 // not java.lang.Record.
3843 if (supports_records() &&
3844 cp->klass_name_at(_super_class_index) == vmSymbols::java_lang_Record()) {
3845 if (parsed_record_attribute) {
3846 classfile_parse_error("Multiple Record attributes in class file %s", CHECK);
3847 }
3848 // Check that class is final and not abstract.
3849 if (!_access_flags.is_final() || _access_flags.is_abstract()) {
3850 classfile_parse_error("Record attribute in non-final or abstract class file %s", CHECK);
3851 }
3852 parsed_record_attribute = true;
3853 record_attribute_start = cfs->current();
3854 record_attribute_length = attribute_length;
3855 } else if (log_is_enabled(Info, class, record)) {
3856 // Log why the Record attribute was ignored. Note that if the
3857 // class file version is JVM_CLASSFILE_MAJOR_VERSION.65535 and
3858 // --enable-preview wasn't specified then a java.lang.UnsupportedClassVersionError
3859 // exception would have been thrown.
3860 ResourceMark rm(THREAD);
3861 if (supports_records()) {
3862 log_info(class, record)(
3863 "Ignoring Record attribute in class %s because super type is not java.lang.Record",
3864 _class_name->as_C_string());
3865 } else {
3866 log_info(class, record)(
3867 "Ignoring Record attribute in class %s because class file version is not %d.65535",
3868 _class_name->as_C_string(), JVM_CLASSFILE_MAJOR_VERSION);
3869 }
3870 }
3871 cfs->skip_u1(attribute_length, CHECK);
3872 } else if (_major_version >= JAVA_15_VERSION) {
3873 // Check for PermittedSubclasses tag
3874 if (tag == vmSymbols::tag_permitted_subclasses()) {
3875 if (supports_sealed_types()) {
3876 if (parsed_permitted_subclasses_attribute) {
3877 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3878 }
3879 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3880 if (_access_flags.is_final()) {
3881 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3882 }
3883 parsed_permitted_subclasses_attribute = true;
3884 permitted_subclasses_attribute_start = cfs->current();
3885 permitted_subclasses_attribute_length = attribute_length;
3886 }
3887 cfs->skip_u1(attribute_length, CHECK);
3888 } else {
3889 // Unknown attribute
3890 cfs->skip_u1(attribute_length, CHECK);
3891 }
3892 } else {
3893 // Unknown attribute
3894 cfs->skip_u1(attribute_length, CHECK);
3895 }
3896 } else {
3897 // Unknown attribute
3898 cfs->skip_u1(attribute_length, CHECK);
3899 }
3900 } else {
3901 // Unknown attribute
3902 cfs->skip_u1(attribute_length, CHECK);
3903 }
3904 } else {
3905 // Unknown attribute
3906 cfs->skip_u1(attribute_length, CHECK);
3907 }
3908 }
3909 _class_annotations = assemble_annotations(runtime_visible_annotations,
3910 runtime_visible_annotations_length,
3911 runtime_invisible_annotations,
3912 runtime_invisible_annotations_length,
3913 CHECK);
3914 _class_type_annotations = assemble_annotations(runtime_visible_type_annotations,
3915 runtime_visible_type_annotations_length,
3916 runtime_invisible_type_annotations,
3917 runtime_invisible_type_annotations_length,
3918 CHECK);
3919
3920 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3921 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3922 cfs,
3923 cp,
3924 inner_classes_attribute_start,
3925 parsed_innerclasses_attribute,
3926 enclosing_method_class_index,
3927 enclosing_method_method_index,
3928 CHECK);
3929 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3930 guarantee_property(
3931 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3932 "Wrong InnerClasses attribute length in class file %s", CHECK);
3933 }
3934 }
3935
3936 if (parsed_nest_members_attribute) {
3937 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3938 cfs,
3939 nest_members_attribute_start,
3940 CHECK);
3941 if (_need_verify) {
3942 guarantee_property(
3943 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3944 "Wrong NestMembers attribute length in class file %s", CHECK);
3945 }
3946 }
3947
3948 if (parsed_record_attribute) {
3949 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3950 cfs,
3951 cp,
3952 record_attribute_start,
3953 CHECK);
3954 if (_need_verify) {
3955 guarantee_property(record_attribute_length == calculated_attr_length,
3956 "Record attribute has wrong length in class file %s",
3957 CHECK);
3958 }
3959 }
3960
3961 if (parsed_permitted_subclasses_attribute) {
3962 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3963 cfs,
3964 permitted_subclasses_attribute_start,
3965 CHECK);
3966 if (_need_verify) {
3967 guarantee_property(
3968 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3969 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3970 }
3971 }
3972
3973 if (_max_bootstrap_specifier_index >= 0) {
3974 guarantee_property(parsed_bootstrap_methods_attribute,
3975 "Missing BootstrapMethods attribute in class file %s", CHECK);
3976 }
3977 }
3978
apply_parsed_class_attributes(InstanceKlass * k)3979 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3980 assert(k != NULL, "invariant");
3981
3982 if (_synthetic_flag)
3983 k->set_is_synthetic();
3984 if (_sourcefile_index != 0) {
3985 k->set_source_file_name_index(_sourcefile_index);
3986 }
3987 if (_generic_signature_index != 0) {
3988 k->set_generic_signature_index(_generic_signature_index);
3989 }
3990 if (_sde_buffer != NULL) {
3991 k->set_source_debug_extension(_sde_buffer, _sde_length);
3992 }
3993 }
3994
3995 // Create the Annotations object that will
3996 // hold the annotations array for the Klass.
create_combined_annotations(TRAPS)3997 void ClassFileParser::create_combined_annotations(TRAPS) {
3998 if (_class_annotations == NULL &&
3999 _class_type_annotations == NULL &&
4000 _fields_annotations == NULL &&
4001 _fields_type_annotations == NULL) {
4002 // Don't create the Annotations object unnecessarily.
4003 return;
4004 }
4005
4006 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
4007 annotations->set_class_annotations(_class_annotations);
4008 annotations->set_class_type_annotations(_class_type_annotations);
4009 annotations->set_fields_annotations(_fields_annotations);
4010 annotations->set_fields_type_annotations(_fields_type_annotations);
4011
4012 // This is the Annotations object that will be
4013 // assigned to InstanceKlass being constructed.
4014 _combined_annotations = annotations;
4015
4016 // The annotations arrays below has been transfered the
4017 // _combined_annotations so these fields can now be cleared.
4018 _class_annotations = NULL;
4019 _class_type_annotations = NULL;
4020 _fields_annotations = NULL;
4021 _fields_type_annotations = NULL;
4022 }
4023
4024 // Transfer ownership of metadata allocated to the InstanceKlass.
apply_parsed_class_metadata(InstanceKlass * this_klass,int java_fields_count,TRAPS)4025 void ClassFileParser::apply_parsed_class_metadata(
4026 InstanceKlass* this_klass,
4027 int java_fields_count,
4028 TRAPS) {
4029 assert(this_klass != NULL, "invariant");
4030
4031 _cp->set_pool_holder(this_klass);
4032 this_klass->set_constants(_cp);
4033 this_klass->set_fields(_fields, java_fields_count);
4034 this_klass->set_methods(_methods);
4035 this_klass->set_inner_classes(_inner_classes);
4036 this_klass->set_nest_members(_nest_members);
4037 this_klass->set_nest_host_index(_nest_host);
4038 this_klass->set_annotations(_combined_annotations);
4039 this_klass->set_permitted_subclasses(_permitted_subclasses);
4040 this_klass->set_record_components(_record_components);
4041 // Delay the setting of _local_interfaces and _transitive_interfaces until after
4042 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
4043 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
4044 // its _super. If an OOM occurs while loading the current klass, its _super field
4045 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
4046 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
4047 // dereferences to the deallocated _transitive_interfaces will result in a crash.
4048
4049 // Clear out these fields so they don't get deallocated by the destructor
4050 clear_class_metadata();
4051 }
4052
assemble_annotations(const u1 * const runtime_visible_annotations,int runtime_visible_annotations_length,const u1 * const runtime_invisible_annotations,int runtime_invisible_annotations_length,TRAPS)4053 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
4054 int runtime_visible_annotations_length,
4055 const u1* const runtime_invisible_annotations,
4056 int runtime_invisible_annotations_length,
4057 TRAPS) {
4058 AnnotationArray* annotations = NULL;
4059 if (runtime_visible_annotations != NULL ||
4060 runtime_invisible_annotations != NULL) {
4061 annotations = MetadataFactory::new_array<u1>(_loader_data,
4062 runtime_visible_annotations_length +
4063 runtime_invisible_annotations_length,
4064 CHECK_(annotations));
4065 if (runtime_visible_annotations != NULL) {
4066 for (int i = 0; i < runtime_visible_annotations_length; i++) {
4067 annotations->at_put(i, runtime_visible_annotations[i]);
4068 }
4069 }
4070 if (runtime_invisible_annotations != NULL) {
4071 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
4072 int append = runtime_visible_annotations_length+i;
4073 annotations->at_put(append, runtime_invisible_annotations[i]);
4074 }
4075 }
4076 }
4077 return annotations;
4078 }
4079
parse_super_class(ConstantPool * const cp,const int super_class_index,const bool need_verify,TRAPS)4080 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
4081 const int super_class_index,
4082 const bool need_verify,
4083 TRAPS) {
4084 assert(cp != NULL, "invariant");
4085 const InstanceKlass* super_klass = NULL;
4086
4087 if (super_class_index == 0) {
4088 check_property(_class_name == vmSymbols::java_lang_Object(),
4089 "Invalid superclass index %u in class file %s",
4090 super_class_index,
4091 CHECK_NULL);
4092 } else {
4093 check_property(valid_klass_reference_at(super_class_index),
4094 "Invalid superclass index %u in class file %s",
4095 super_class_index,
4096 CHECK_NULL);
4097 // The class name should be legal because it is checked when parsing constant pool.
4098 // However, make sure it is not an array type.
4099 bool is_array = false;
4100 if (cp->tag_at(super_class_index).is_klass()) {
4101 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
4102 if (need_verify)
4103 is_array = super_klass->is_array_klass();
4104 } else if (need_verify) {
4105 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
4106 }
4107 if (need_verify) {
4108 guarantee_property(!is_array,
4109 "Bad superclass name in class file %s", CHECK_NULL);
4110 }
4111 }
4112 return super_klass;
4113 }
4114
4115 #ifndef PRODUCT
print_field_layout(const Symbol * name,Array<u2> * fields,ConstantPool * cp,int instance_size,int instance_fields_start,int instance_fields_end,int static_fields_end)4116 static void print_field_layout(const Symbol* name,
4117 Array<u2>* fields,
4118 ConstantPool* cp,
4119 int instance_size,
4120 int instance_fields_start,
4121 int instance_fields_end,
4122 int static_fields_end) {
4123
4124 assert(name != NULL, "invariant");
4125
4126 tty->print("%s: field layout\n", name->as_klass_external_name());
4127 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4128 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4129 if (!fs.access_flags().is_static()) {
4130 tty->print(" @%3d \"%s\" %s\n",
4131 fs.offset(),
4132 fs.name()->as_klass_external_name(),
4133 fs.signature()->as_klass_external_name());
4134 }
4135 }
4136 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4137 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4138 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4139 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4140 if (fs.access_flags().is_static()) {
4141 tty->print(" @%3d \"%s\" %s\n",
4142 fs.offset(),
4143 fs.name()->as_klass_external_name(),
4144 fs.signature()->as_klass_external_name());
4145 }
4146 }
4147 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4148 tty->print("\n");
4149 }
4150 #endif
4151
OopMapBlocksBuilder(unsigned int max_blocks)4152 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
4153 _max_nonstatic_oop_maps = max_blocks;
4154 _nonstatic_oop_map_count = 0;
4155 if (max_blocks == 0) {
4156 _nonstatic_oop_maps = NULL;
4157 } else {
4158 _nonstatic_oop_maps =
4159 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
4160 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
4161 }
4162 }
4163
last_oop_map() const4164 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
4165 assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
4166 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
4167 }
4168
4169 // addition of super oop maps
initialize_inherited_blocks(OopMapBlock * blocks,unsigned int nof_blocks)4170 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
4171 assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
4172 nof_blocks <= _max_nonstatic_oop_maps, "invariant");
4173
4174 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
4175 _nonstatic_oop_map_count += nof_blocks;
4176 }
4177
4178 // collection of oops
add(int offset,int count)4179 void OopMapBlocksBuilder::add(int offset, int count) {
4180 if (_nonstatic_oop_map_count == 0) {
4181 _nonstatic_oop_map_count++;
4182 }
4183 OopMapBlock* nonstatic_oop_map = last_oop_map();
4184 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
4185 nonstatic_oop_map->set_offset(offset);
4186 nonstatic_oop_map->set_count(count);
4187 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
4188 nonstatic_oop_map->increment_count(count);
4189 } else { // Need a new one...
4190 _nonstatic_oop_map_count++;
4191 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
4192 nonstatic_oop_map = last_oop_map();
4193 nonstatic_oop_map->set_offset(offset);
4194 nonstatic_oop_map->set_count(count);
4195 }
4196 }
4197
4198 // general purpose copy, e.g. into allocated instanceKlass
copy(OopMapBlock * dst)4199 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
4200 if (_nonstatic_oop_map_count != 0) {
4201 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
4202 }
4203 }
4204
4205 // Sort and compact adjacent blocks
compact()4206 void OopMapBlocksBuilder::compact() {
4207 if (_nonstatic_oop_map_count <= 1) {
4208 return;
4209 }
4210 /*
4211 * Since field layout sneeks in oops before values, we will be able to condense
4212 * blocks. There is potential to compact between super, own refs and values
4213 * containing refs.
4214 *
4215 * Currently compaction is slightly limited due to values being 8 byte aligned.
4216 * This may well change: FixMe if it doesn't, the code below is fairly general purpose
4217 * and maybe it doesn't need to be.
4218 */
4219 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
4220 (_sort_Fn)OopMapBlock::compare_offset);
4221 if (_nonstatic_oop_map_count < 2) {
4222 return;
4223 }
4224
4225 // Make a temp copy, and iterate through and copy back into the original
4226 ResourceMark rm;
4227 OopMapBlock* oop_maps_copy =
4228 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
4229 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
4230 copy(oop_maps_copy);
4231 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
4232 unsigned int new_count = 1;
4233 oop_maps_copy++;
4234 while(oop_maps_copy < oop_maps_copy_end) {
4235 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4236 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4237 nonstatic_oop_map->increment_count(oop_maps_copy->count());
4238 } else {
4239 nonstatic_oop_map++;
4240 new_count++;
4241 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4242 nonstatic_oop_map->set_count(oop_maps_copy->count());
4243 }
4244 oop_maps_copy++;
4245 }
4246 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
4247 _nonstatic_oop_map_count = new_count;
4248 }
4249
print_on(outputStream * st) const4250 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4251 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4252 if (_nonstatic_oop_map_count > 0) {
4253 OopMapBlock* map = _nonstatic_oop_maps;
4254 OopMapBlock* last_map = last_oop_map();
4255 assert(map <= last_map, "Last less than first");
4256 while (map <= last_map) {
4257 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4258 map->offset() + map->offset_span() - heapOopSize, map->count());
4259 map++;
4260 }
4261 }
4262 }
4263
print_value_on(outputStream * st) const4264 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4265 print_on(st);
4266 }
4267
4268 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
layout_fields(ConstantPool * cp,const FieldAllocationCount * fac,const ClassAnnotationCollector * parsed_annotations,FieldLayoutInfo * info,TRAPS)4269 void ClassFileParser::layout_fields(ConstantPool* cp,
4270 const FieldAllocationCount* fac,
4271 const ClassAnnotationCollector* parsed_annotations,
4272 FieldLayoutInfo* info,
4273 TRAPS) {
4274
4275 assert(cp != NULL, "invariant");
4276
4277 // Field size and offset computation
4278 int nonstatic_field_size = _super_klass == NULL ? 0 :
4279 _super_klass->nonstatic_field_size();
4280
4281 // Count the contended fields by type.
4282 //
4283 // We ignore static fields, because @Contended is not supported for them.
4284 // The layout code below will also ignore the static fields.
4285 int nonstatic_contended_count = 0;
4286 FieldAllocationCount fac_contended;
4287 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4288 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4289 if (fs.is_contended()) {
4290 fac_contended.count[atype]++;
4291 if (!fs.access_flags().is_static()) {
4292 nonstatic_contended_count++;
4293 }
4294 }
4295 }
4296
4297
4298 // Calculate the starting byte offsets
4299 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
4300 int next_static_double_offset = next_static_oop_offset +
4301 ((fac->count[STATIC_OOP]) * heapOopSize);
4302 if (fac->count[STATIC_DOUBLE]) {
4303 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
4304 }
4305
4306 int next_static_word_offset = next_static_double_offset +
4307 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
4308 int next_static_short_offset = next_static_word_offset +
4309 ((fac->count[STATIC_WORD]) * BytesPerInt);
4310 int next_static_byte_offset = next_static_short_offset +
4311 ((fac->count[STATIC_SHORT]) * BytesPerShort);
4312
4313 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
4314 nonstatic_field_size * heapOopSize;
4315
4316 int next_nonstatic_field_offset = nonstatic_fields_start;
4317
4318 const bool is_contended_class = parsed_annotations->is_contended();
4319
4320 // Class is contended, pad before all the fields
4321 if (is_contended_class) {
4322 next_nonstatic_field_offset += ContendedPaddingWidth;
4323 }
4324
4325 // Compute the non-contended fields count.
4326 // The packing code below relies on these counts to determine if some field
4327 // can be squeezed into the alignment gap. Contended fields are obviously
4328 // exempt from that.
4329 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
4330 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
4331 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
4332 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
4333 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
4334
4335 // Total non-static fields count, including every contended field
4336 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
4337 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
4338 fac->count[NONSTATIC_OOP];
4339
4340 const bool super_has_nonstatic_fields =
4341 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
4342 const bool has_nonstatic_fields =
4343 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
4344
4345
4346 // Prepare list of oops for oop map generation.
4347 //
4348 // "offset" and "count" lists are describing the set of contiguous oop
4349 // regions. offset[i] is the start of the i-th region, which then has
4350 // count[i] oops following. Before we know how many regions are required,
4351 // we pessimistically allocate the maps to fit all the oops into the
4352 // distinct regions.
4353
4354 int super_oop_map_count = (_super_klass == NULL) ? 0 :_super_klass->nonstatic_oop_map_count();
4355 int max_oop_map_count = super_oop_map_count + fac->count[NONSTATIC_OOP];
4356
4357 OopMapBlocksBuilder* nonstatic_oop_maps = new OopMapBlocksBuilder(max_oop_map_count);
4358 if (super_oop_map_count > 0) {
4359 nonstatic_oop_maps->initialize_inherited_blocks(_super_klass->start_of_nonstatic_oop_maps(),
4360 _super_klass->nonstatic_oop_map_count());
4361 }
4362
4363 int first_nonstatic_oop_offset = 0; // will be set for first oop field
4364
4365 bool compact_fields = true;
4366 bool allocate_oops_first = false;
4367
4368 int next_nonstatic_oop_offset = 0;
4369 int next_nonstatic_double_offset = 0;
4370
4371 // Rearrange fields for a given allocation style
4372 if (allocate_oops_first) {
4373 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
4374 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4375 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4376 (nonstatic_oop_count * heapOopSize);
4377 } else {
4378 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
4379 next_nonstatic_double_offset = next_nonstatic_field_offset;
4380 }
4381
4382 int nonstatic_oop_space_count = 0;
4383 int nonstatic_word_space_count = 0;
4384 int nonstatic_short_space_count = 0;
4385 int nonstatic_byte_space_count = 0;
4386 int nonstatic_oop_space_offset = 0;
4387 int nonstatic_word_space_offset = 0;
4388 int nonstatic_short_space_offset = 0;
4389 int nonstatic_byte_space_offset = 0;
4390
4391 // Try to squeeze some of the fields into the gaps due to
4392 // long/double alignment.
4393 if (nonstatic_double_count > 0) {
4394 int offset = next_nonstatic_double_offset;
4395 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
4396 if (compact_fields && offset != next_nonstatic_double_offset) {
4397 // Allocate available fields into the gap before double field.
4398 int length = next_nonstatic_double_offset - offset;
4399 assert(length == BytesPerInt, "");
4400 nonstatic_word_space_offset = offset;
4401 if (nonstatic_word_count > 0) {
4402 nonstatic_word_count -= 1;
4403 nonstatic_word_space_count = 1; // Only one will fit
4404 length -= BytesPerInt;
4405 offset += BytesPerInt;
4406 }
4407 nonstatic_short_space_offset = offset;
4408 while (length >= BytesPerShort && nonstatic_short_count > 0) {
4409 nonstatic_short_count -= 1;
4410 nonstatic_short_space_count += 1;
4411 length -= BytesPerShort;
4412 offset += BytesPerShort;
4413 }
4414 nonstatic_byte_space_offset = offset;
4415 while (length > 0 && nonstatic_byte_count > 0) {
4416 nonstatic_byte_count -= 1;
4417 nonstatic_byte_space_count += 1;
4418 length -= 1;
4419 }
4420 // Allocate oop field in the gap if there are no other fields for that.
4421 nonstatic_oop_space_offset = offset;
4422 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
4423 !allocate_oops_first) { // when oop fields not first
4424 nonstatic_oop_count -= 1;
4425 nonstatic_oop_space_count = 1; // Only one will fit
4426 length -= heapOopSize;
4427 offset += heapOopSize;
4428 }
4429 }
4430 }
4431
4432 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4433 (nonstatic_double_count * BytesPerLong);
4434 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4435 (nonstatic_word_count * BytesPerInt);
4436 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4437 (nonstatic_short_count * BytesPerShort);
4438 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4439 nonstatic_byte_count;
4440
4441 // let oops jump before padding with this allocation style
4442 if (!allocate_oops_first) {
4443 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4444 if( nonstatic_oop_count > 0 ) {
4445 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4446 }
4447 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4448 }
4449
4450 // Iterate over fields again and compute correct offsets.
4451 // The field allocation type was temporarily stored in the offset slot.
4452 // oop fields are located before non-oop fields (static and non-static).
4453 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4454
4455 // skip already laid out fields
4456 if (fs.is_offset_set()) continue;
4457
4458 // contended instance fields are handled below
4459 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4460
4461 int real_offset = 0;
4462 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4463
4464 // pack the rest of the fields
4465 switch (atype) {
4466 case STATIC_OOP:
4467 real_offset = next_static_oop_offset;
4468 next_static_oop_offset += heapOopSize;
4469 break;
4470 case STATIC_BYTE:
4471 real_offset = next_static_byte_offset;
4472 next_static_byte_offset += 1;
4473 break;
4474 case STATIC_SHORT:
4475 real_offset = next_static_short_offset;
4476 next_static_short_offset += BytesPerShort;
4477 break;
4478 case STATIC_WORD:
4479 real_offset = next_static_word_offset;
4480 next_static_word_offset += BytesPerInt;
4481 break;
4482 case STATIC_DOUBLE:
4483 real_offset = next_static_double_offset;
4484 next_static_double_offset += BytesPerLong;
4485 break;
4486 case NONSTATIC_OOP:
4487 if( nonstatic_oop_space_count > 0 ) {
4488 real_offset = nonstatic_oop_space_offset;
4489 nonstatic_oop_space_offset += heapOopSize;
4490 nonstatic_oop_space_count -= 1;
4491 } else {
4492 real_offset = next_nonstatic_oop_offset;
4493 next_nonstatic_oop_offset += heapOopSize;
4494 }
4495 nonstatic_oop_maps->add(real_offset, 1);
4496 break;
4497 case NONSTATIC_BYTE:
4498 if( nonstatic_byte_space_count > 0 ) {
4499 real_offset = nonstatic_byte_space_offset;
4500 nonstatic_byte_space_offset += 1;
4501 nonstatic_byte_space_count -= 1;
4502 } else {
4503 real_offset = next_nonstatic_byte_offset;
4504 next_nonstatic_byte_offset += 1;
4505 }
4506 break;
4507 case NONSTATIC_SHORT:
4508 if( nonstatic_short_space_count > 0 ) {
4509 real_offset = nonstatic_short_space_offset;
4510 nonstatic_short_space_offset += BytesPerShort;
4511 nonstatic_short_space_count -= 1;
4512 } else {
4513 real_offset = next_nonstatic_short_offset;
4514 next_nonstatic_short_offset += BytesPerShort;
4515 }
4516 break;
4517 case NONSTATIC_WORD:
4518 if( nonstatic_word_space_count > 0 ) {
4519 real_offset = nonstatic_word_space_offset;
4520 nonstatic_word_space_offset += BytesPerInt;
4521 nonstatic_word_space_count -= 1;
4522 } else {
4523 real_offset = next_nonstatic_word_offset;
4524 next_nonstatic_word_offset += BytesPerInt;
4525 }
4526 break;
4527 case NONSTATIC_DOUBLE:
4528 real_offset = next_nonstatic_double_offset;
4529 next_nonstatic_double_offset += BytesPerLong;
4530 break;
4531 default:
4532 ShouldNotReachHere();
4533 }
4534 fs.set_offset(real_offset);
4535 }
4536
4537
4538 // Handle the contended cases.
4539 //
4540 // Each contended field should not intersect the cache line with another contended field.
4541 // In the absence of alignment information, we end up with pessimistically separating
4542 // the fields with full-width padding.
4543 //
4544 // Additionally, this should not break alignment for the fields, so we round the alignment up
4545 // for each field.
4546 if (nonstatic_contended_count > 0) {
4547
4548 // if there is at least one contended field, we need to have pre-padding for them
4549 next_nonstatic_padded_offset += ContendedPaddingWidth;
4550
4551 // collect all contended groups
4552 ResourceBitMap bm(cp->size());
4553 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4554 // skip already laid out fields
4555 if (fs.is_offset_set()) continue;
4556
4557 if (fs.is_contended()) {
4558 bm.set_bit(fs.contended_group());
4559 }
4560 }
4561
4562 int current_group = -1;
4563 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4564
4565 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4566
4567 // skip already laid out fields
4568 if (fs.is_offset_set()) continue;
4569
4570 // skip non-contended fields and fields from different group
4571 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4572
4573 // handle statics below
4574 if (fs.access_flags().is_static()) continue;
4575
4576 int real_offset = 0;
4577 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4578
4579 switch (atype) {
4580 case NONSTATIC_BYTE:
4581 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4582 real_offset = next_nonstatic_padded_offset;
4583 next_nonstatic_padded_offset += 1;
4584 break;
4585
4586 case NONSTATIC_SHORT:
4587 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4588 real_offset = next_nonstatic_padded_offset;
4589 next_nonstatic_padded_offset += BytesPerShort;
4590 break;
4591
4592 case NONSTATIC_WORD:
4593 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4594 real_offset = next_nonstatic_padded_offset;
4595 next_nonstatic_padded_offset += BytesPerInt;
4596 break;
4597
4598 case NONSTATIC_DOUBLE:
4599 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4600 real_offset = next_nonstatic_padded_offset;
4601 next_nonstatic_padded_offset += BytesPerLong;
4602 break;
4603
4604 case NONSTATIC_OOP:
4605 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4606 real_offset = next_nonstatic_padded_offset;
4607 next_nonstatic_padded_offset += heapOopSize;
4608 nonstatic_oop_maps->add(real_offset, 1);
4609 break;
4610
4611 default:
4612 ShouldNotReachHere();
4613 }
4614
4615 if (fs.contended_group() == 0) {
4616 // Contended group defines the equivalence class over the fields:
4617 // the fields within the same contended group are not inter-padded.
4618 // The only exception is default group, which does not incur the
4619 // equivalence, and so requires intra-padding.
4620 next_nonstatic_padded_offset += ContendedPaddingWidth;
4621 }
4622
4623 fs.set_offset(real_offset);
4624 } // for
4625
4626 // Start laying out the next group.
4627 // Note that this will effectively pad the last group in the back;
4628 // this is expected to alleviate memory contention effects for
4629 // subclass fields and/or adjacent object.
4630 // If this was the default group, the padding is already in place.
4631 if (current_group != 0) {
4632 next_nonstatic_padded_offset += ContendedPaddingWidth;
4633 }
4634 }
4635
4636 // handle static fields
4637 }
4638
4639 // Entire class is contended, pad in the back.
4640 // This helps to alleviate memory contention effects for subclass fields
4641 // and/or adjacent object.
4642 if (is_contended_class) {
4643 next_nonstatic_padded_offset += ContendedPaddingWidth;
4644 }
4645
4646 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4647
4648 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize);
4649 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4650 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4651
4652 int static_field_size = (static_fields_end -
4653 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4654 nonstatic_field_size = nonstatic_field_size +
4655 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4656
4657 int instance_size = align_object_size(instance_end / wordSize);
4658
4659 assert(instance_size == align_object_size(align_up(
4660 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
4661 wordSize) / wordSize), "consistent layout helper value");
4662
4663 // Invariant: nonstatic_field end/start should only change if there are
4664 // nonstatic fields in the class, or if the class is contended. We compare
4665 // against the non-aligned value, so that end alignment will not fail the
4666 // assert without actually having the fields.
4667 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4668 is_contended_class ||
4669 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4670
4671 // Number of non-static oop map blocks allocated at end of klass.
4672 nonstatic_oop_maps->compact();
4673
4674 #ifndef PRODUCT
4675 if (PrintFieldLayout) {
4676 print_field_layout(_class_name,
4677 _fields,
4678 cp,
4679 instance_size,
4680 nonstatic_fields_start,
4681 nonstatic_fields_end,
4682 static_fields_end);
4683 }
4684
4685 #endif
4686 // Pass back information needed for InstanceKlass creation
4687 info->oop_map_blocks = nonstatic_oop_maps;
4688 info->_instance_size = instance_size;
4689 info->_static_field_size = static_field_size;
4690 info->_nonstatic_field_size = nonstatic_field_size;
4691 info->_has_nonstatic_fields = has_nonstatic_fields;
4692 }
4693
set_precomputed_flags(InstanceKlass * ik)4694 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4695 assert(ik != NULL, "invariant");
4696
4697 const Klass* const super = ik->super();
4698
4699 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4700 // in which case we don't have to register objects as finalizable
4701 if (!_has_empty_finalizer) {
4702 if (_has_finalizer ||
4703 (super != NULL && super->has_finalizer())) {
4704 ik->set_has_finalizer();
4705 }
4706 }
4707
4708 #ifdef ASSERT
4709 bool f = false;
4710 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4711 vmSymbols::void_method_signature());
4712 if (m != NULL && !m->is_empty_method()) {
4713 f = true;
4714 }
4715
4716 // Spec doesn't prevent agent from redefinition of empty finalizer.
4717 // Despite the fact that it's generally bad idea and redefined finalizer
4718 // will not work as expected we shouldn't abort vm in this case
4719 if (!ik->has_redefined_this_or_super()) {
4720 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4721 }
4722 #endif
4723
4724 // Check if this klass supports the java.lang.Cloneable interface
4725 if (SystemDictionary::Cloneable_klass_loaded()) {
4726 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4727 ik->set_is_cloneable();
4728 }
4729 }
4730
4731 // Check if this klass has a vanilla default constructor
4732 if (super == NULL) {
4733 // java.lang.Object has empty default constructor
4734 ik->set_has_vanilla_constructor();
4735 } else {
4736 if (super->has_vanilla_constructor() &&
4737 _has_vanilla_constructor) {
4738 ik->set_has_vanilla_constructor();
4739 }
4740 #ifdef ASSERT
4741 bool v = false;
4742 if (super->has_vanilla_constructor()) {
4743 const Method* const constructor =
4744 ik->find_method(vmSymbols::object_initializer_name(),
4745 vmSymbols::void_method_signature());
4746 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4747 v = true;
4748 }
4749 }
4750 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4751 #endif
4752 }
4753
4754 // If it cannot be fast-path allocated, set a bit in the layout helper.
4755 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4756 assert(ik->size_helper() > 0, "layout_helper is initialized");
4757 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4758 || ik->is_abstract() || ik->is_interface()
4759 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4760 || ik->size_helper() >= FastAllocateSizeLimit) {
4761 // Forbid fast-path allocation.
4762 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4763 ik->set_layout_helper(lh);
4764 }
4765 }
4766
4767 // utility methods for appending an array with check for duplicates
4768
append_interfaces(GrowableArray<InstanceKlass * > * result,const Array<InstanceKlass * > * const ifs)4769 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4770 const Array<InstanceKlass*>* const ifs) {
4771 // iterate over new interfaces
4772 for (int i = 0; i < ifs->length(); i++) {
4773 InstanceKlass* const e = ifs->at(i);
4774 assert(e->is_klass() && e->is_interface(), "just checking");
4775 // add new interface
4776 result->append_if_missing(e);
4777 }
4778 }
4779
compute_transitive_interfaces(const InstanceKlass * super,Array<InstanceKlass * > * local_ifs,ClassLoaderData * loader_data,TRAPS)4780 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4781 Array<InstanceKlass*>* local_ifs,
4782 ClassLoaderData* loader_data,
4783 TRAPS) {
4784 assert(local_ifs != NULL, "invariant");
4785 assert(loader_data != NULL, "invariant");
4786
4787 // Compute maximum size for transitive interfaces
4788 int max_transitive_size = 0;
4789 int super_size = 0;
4790 // Add superclass transitive interfaces size
4791 if (super != NULL) {
4792 super_size = super->transitive_interfaces()->length();
4793 max_transitive_size += super_size;
4794 }
4795 // Add local interfaces' super interfaces
4796 const int local_size = local_ifs->length();
4797 for (int i = 0; i < local_size; i++) {
4798 InstanceKlass* const l = local_ifs->at(i);
4799 max_transitive_size += l->transitive_interfaces()->length();
4800 }
4801 // Finally add local interfaces
4802 max_transitive_size += local_size;
4803 // Construct array
4804 if (max_transitive_size == 0) {
4805 // no interfaces, use canonicalized array
4806 return Universe::the_empty_instance_klass_array();
4807 } else if (max_transitive_size == super_size) {
4808 // no new local interfaces added, share superklass' transitive interface array
4809 return super->transitive_interfaces();
4810 } else if (max_transitive_size == local_size) {
4811 // only local interfaces added, share local interface array
4812 return local_ifs;
4813 } else {
4814 ResourceMark rm;
4815 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4816
4817 // Copy down from superclass
4818 if (super != NULL) {
4819 append_interfaces(result, super->transitive_interfaces());
4820 }
4821
4822 // Copy down from local interfaces' superinterfaces
4823 for (int i = 0; i < local_size; i++) {
4824 InstanceKlass* const l = local_ifs->at(i);
4825 append_interfaces(result, l->transitive_interfaces());
4826 }
4827 // Finally add local interfaces
4828 append_interfaces(result, local_ifs);
4829
4830 // length will be less than the max_transitive_size if duplicates were removed
4831 const int length = result->length();
4832 assert(length <= max_transitive_size, "just checking");
4833 Array<InstanceKlass*>* const new_result =
4834 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4835 for (int i = 0; i < length; i++) {
4836 InstanceKlass* const e = result->at(i);
4837 assert(e != NULL, "just checking");
4838 new_result->at_put(i, e);
4839 }
4840 return new_result;
4841 }
4842 }
4843
check_super_class_access(const InstanceKlass * this_klass,TRAPS)4844 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4845 assert(this_klass != NULL, "invariant");
4846 const Klass* const super = this_klass->super();
4847
4848 if (super != NULL) {
4849 const InstanceKlass* super_ik = InstanceKlass::cast(super);
4850
4851 if (super->is_final()) {
4852 ResourceMark rm(THREAD);
4853 Exceptions::fthrow(
4854 THREAD_AND_LOCATION,
4855 vmSymbols::java_lang_VerifyError(),
4856 "class %s cannot inherit from final class %s",
4857 this_klass->external_name(),
4858 super_ik->external_name());
4859 return;
4860 }
4861
4862 if (super_ik->is_sealed() && !super_ik->has_as_permitted_subclass(this_klass)) {
4863 ResourceMark rm(THREAD);
4864 Exceptions::fthrow(
4865 THREAD_AND_LOCATION,
4866 vmSymbols::java_lang_IncompatibleClassChangeError(),
4867 "class %s cannot inherit from sealed class %s",
4868 this_klass->external_name(),
4869 super_ik->external_name());
4870 return;
4871 }
4872
4873 // If the loader is not the boot loader then throw an exception if its
4874 // superclass is in package jdk.internal.reflect and its loader is not a
4875 // special reflection class loader
4876 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4877 PackageEntry* super_package = super->package();
4878 if (super_package != NULL &&
4879 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4880 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4881 ResourceMark rm(THREAD);
4882 Exceptions::fthrow(
4883 THREAD_AND_LOCATION,
4884 vmSymbols::java_lang_IllegalAccessError(),
4885 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4886 this_klass->external_name(),
4887 this_klass->class_loader_data()->loader_name_and_id(),
4888 super->external_name());
4889 return;
4890 }
4891 }
4892
4893 Reflection::VerifyClassAccessResults vca_result =
4894 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4895 if (vca_result != Reflection::ACCESS_OK) {
4896 ResourceMark rm(THREAD);
4897 char* msg = Reflection::verify_class_access_msg(this_klass,
4898 InstanceKlass::cast(super),
4899 vca_result);
4900 if (msg == NULL) {
4901 bool same_module = (this_klass->module() == super->module());
4902 Exceptions::fthrow(
4903 THREAD_AND_LOCATION,
4904 vmSymbols::java_lang_IllegalAccessError(),
4905 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4906 this_klass->external_name(),
4907 super->is_abstract() ? "abstract " : "",
4908 super->external_name(),
4909 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4910 (same_module) ? "" : "; ",
4911 (same_module) ? "" : super->class_in_module_of_loader());
4912 } else {
4913 // Add additional message content.
4914 Exceptions::fthrow(
4915 THREAD_AND_LOCATION,
4916 vmSymbols::java_lang_IllegalAccessError(),
4917 "superclass access check failed: %s",
4918 msg);
4919 }
4920 }
4921 }
4922 }
4923
4924
check_super_interface_access(const InstanceKlass * this_klass,TRAPS)4925 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4926 assert(this_klass != NULL, "invariant");
4927 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4928 const int lng = local_interfaces->length();
4929 for (int i = lng - 1; i >= 0; i--) {
4930 InstanceKlass* const k = local_interfaces->at(i);
4931 assert (k != NULL && k->is_interface(), "invalid interface");
4932
4933 if (k->is_sealed() && !k->has_as_permitted_subclass(this_klass)) {
4934 ResourceMark rm(THREAD);
4935 Exceptions::fthrow(
4936 THREAD_AND_LOCATION,
4937 vmSymbols::java_lang_IncompatibleClassChangeError(),
4938 "class %s cannot %s sealed interface %s",
4939 this_klass->external_name(),
4940 this_klass->is_interface() ? "extend" : "implement",
4941 k->external_name());
4942 return;
4943 }
4944
4945 Reflection::VerifyClassAccessResults vca_result =
4946 Reflection::verify_class_access(this_klass, k, false);
4947 if (vca_result != Reflection::ACCESS_OK) {
4948 ResourceMark rm(THREAD);
4949 char* msg = Reflection::verify_class_access_msg(this_klass,
4950 k,
4951 vca_result);
4952 if (msg == NULL) {
4953 bool same_module = (this_klass->module() == k->module());
4954 Exceptions::fthrow(
4955 THREAD_AND_LOCATION,
4956 vmSymbols::java_lang_IllegalAccessError(),
4957 "class %s cannot access its superinterface %s (%s%s%s)",
4958 this_klass->external_name(),
4959 k->external_name(),
4960 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4961 (same_module) ? "" : "; ",
4962 (same_module) ? "" : k->class_in_module_of_loader());
4963 } else {
4964 // Add additional message content.
4965 Exceptions::fthrow(
4966 THREAD_AND_LOCATION,
4967 vmSymbols::java_lang_IllegalAccessError(),
4968 "superinterface check failed: %s",
4969 msg);
4970 }
4971 }
4972 }
4973 }
4974
4975
check_final_method_override(const InstanceKlass * this_klass,TRAPS)4976 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4977 assert(this_klass != NULL, "invariant");
4978 const Array<Method*>* const methods = this_klass->methods();
4979 const int num_methods = methods->length();
4980
4981 // go thru each method and check if it overrides a final method
4982 for (int index = 0; index < num_methods; index++) {
4983 const Method* const m = methods->at(index);
4984
4985 // skip private, static, and <init> methods
4986 if ((!m->is_private() && !m->is_static()) &&
4987 (m->name() != vmSymbols::object_initializer_name())) {
4988
4989 const Symbol* const name = m->name();
4990 const Symbol* const signature = m->signature();
4991 const Klass* k = this_klass->super();
4992 const Method* super_m = NULL;
4993 while (k != NULL) {
4994 // skip supers that don't have final methods.
4995 if (k->has_final_method()) {
4996 // lookup a matching method in the super class hierarchy
4997 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4998 if (super_m == NULL) {
4999 break; // didn't find any match; get out
5000 }
5001
5002 if (super_m->is_final() && !super_m->is_static() &&
5003 !super_m->access_flags().is_private()) {
5004 // matching method in super is final, and not static or private
5005 bool can_access = Reflection::verify_member_access(this_klass,
5006 super_m->method_holder(),
5007 super_m->method_holder(),
5008 super_m->access_flags(),
5009 false, false, CHECK);
5010 if (can_access) {
5011 // this class can access super final method and therefore override
5012 ResourceMark rm(THREAD);
5013 Exceptions::fthrow(THREAD_AND_LOCATION,
5014 vmSymbols::java_lang_VerifyError(),
5015 "class %s overrides final method %s.%s%s",
5016 this_klass->external_name(),
5017 super_m->method_holder()->external_name(),
5018 name->as_C_string(),
5019 signature->as_C_string()
5020 );
5021 return;
5022 }
5023 }
5024
5025 // continue to look from super_m's holder's super.
5026 k = super_m->method_holder()->super();
5027 continue;
5028 }
5029
5030 k = k->super();
5031 }
5032 }
5033 }
5034 }
5035
5036
5037 // assumes that this_klass is an interface
check_illegal_static_method(const InstanceKlass * this_klass,TRAPS)5038 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
5039 assert(this_klass != NULL, "invariant");
5040 assert(this_klass->is_interface(), "not an interface");
5041 const Array<Method*>* methods = this_klass->methods();
5042 const int num_methods = methods->length();
5043
5044 for (int index = 0; index < num_methods; index++) {
5045 const Method* const m = methods->at(index);
5046 // if m is static and not the init method, throw a verify error
5047 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
5048 ResourceMark rm(THREAD);
5049 Exceptions::fthrow(
5050 THREAD_AND_LOCATION,
5051 vmSymbols::java_lang_VerifyError(),
5052 "Illegal static method %s in interface %s",
5053 m->name()->as_C_string(),
5054 this_klass->external_name()
5055 );
5056 return;
5057 }
5058 }
5059 }
5060
5061 // utility methods for format checking
5062
verify_legal_class_modifiers(jint flags,TRAPS) const5063 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
5064 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5065 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
5066 if (is_module) {
5067 ResourceMark rm(THREAD);
5068 Exceptions::fthrow(
5069 THREAD_AND_LOCATION,
5070 vmSymbols::java_lang_NoClassDefFoundError(),
5071 "%s is not a class because access_flag ACC_MODULE is set",
5072 _class_name->as_C_string());
5073 return;
5074 }
5075
5076 if (!_need_verify) { return; }
5077
5078 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5079 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5080 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5081 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
5082 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5083 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
5084 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
5085 const bool major_gte_14 = _major_version >= JAVA_14_VERSION;
5086
5087 if ((is_abstract && is_final) ||
5088 (is_interface && !is_abstract) ||
5089 (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
5090 (!is_interface && major_gte_1_5 && is_annotation)) {
5091 ResourceMark rm(THREAD);
5092 Exceptions::fthrow(
5093 THREAD_AND_LOCATION,
5094 vmSymbols::java_lang_ClassFormatError(),
5095 "Illegal class modifiers in class %s: 0x%X",
5096 _class_name->as_C_string(), flags
5097 );
5098 return;
5099 }
5100 }
5101
has_illegal_visibility(jint flags)5102 static bool has_illegal_visibility(jint flags) {
5103 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5104 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5105 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5106
5107 return ((is_public && is_protected) ||
5108 (is_public && is_private) ||
5109 (is_protected && is_private));
5110 }
5111
5112 // A legal major_version.minor_version must be one of the following:
5113 //
5114 // Major_version >= 45 and major_version < 56, any minor_version.
5115 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
5116 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
5117 //
verify_class_version(u2 major,u2 minor,Symbol * class_name,TRAPS)5118 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
5119 ResourceMark rm(THREAD);
5120 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
5121 if (major < JAVA_MIN_SUPPORTED_VERSION) {
5122 Exceptions::fthrow(
5123 THREAD_AND_LOCATION,
5124 vmSymbols::java_lang_UnsupportedClassVersionError(),
5125 "%s (class file version %u.%u) was compiled with an invalid major version",
5126 class_name->as_C_string(), major, minor);
5127 return;
5128 }
5129
5130 if (major > max_version) {
5131 Exceptions::fthrow(
5132 THREAD_AND_LOCATION,
5133 vmSymbols::java_lang_UnsupportedClassVersionError(),
5134 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5135 "this version of the Java Runtime only recognizes class file versions up to %u.0",
5136 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
5137 return;
5138 }
5139
5140 if (major < JAVA_12_VERSION || minor == 0) {
5141 return;
5142 }
5143
5144 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
5145 if (major != max_version) {
5146 Exceptions::fthrow(
5147 THREAD_AND_LOCATION,
5148 vmSymbols::java_lang_UnsupportedClassVersionError(),
5149 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
5150 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
5151 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
5152 return;
5153 }
5154
5155 if (!Arguments::enable_preview()) {
5156 Exceptions::fthrow(
5157 THREAD_AND_LOCATION,
5158 vmSymbols::java_lang_UnsupportedClassVersionError(),
5159 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
5160 class_name->as_C_string(), major, minor);
5161 return;
5162 }
5163
5164 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
5165 Exceptions::fthrow(
5166 THREAD_AND_LOCATION,
5167 vmSymbols::java_lang_UnsupportedClassVersionError(),
5168 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
5169 class_name->as_C_string(), major, minor);
5170 }
5171 }
5172
verify_legal_field_modifiers(jint flags,bool is_interface,TRAPS) const5173 void ClassFileParser::verify_legal_field_modifiers(jint flags,
5174 bool is_interface,
5175 TRAPS) const {
5176 if (!_need_verify) { return; }
5177
5178 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5179 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5180 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5181 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5182 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5183 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
5184 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
5185 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5186 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
5187
5188 bool is_illegal = false;
5189
5190 if (is_interface) {
5191 if (!is_public || !is_static || !is_final || is_private ||
5192 is_protected || is_volatile || is_transient ||
5193 (major_gte_1_5 && is_enum)) {
5194 is_illegal = true;
5195 }
5196 } else { // not interface
5197 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
5198 is_illegal = true;
5199 }
5200 }
5201
5202 if (is_illegal) {
5203 ResourceMark rm(THREAD);
5204 Exceptions::fthrow(
5205 THREAD_AND_LOCATION,
5206 vmSymbols::java_lang_ClassFormatError(),
5207 "Illegal field modifiers in class %s: 0x%X",
5208 _class_name->as_C_string(), flags);
5209 return;
5210 }
5211 }
5212
verify_legal_method_modifiers(jint flags,bool is_interface,const Symbol * name,TRAPS) const5213 void ClassFileParser::verify_legal_method_modifiers(jint flags,
5214 bool is_interface,
5215 const Symbol* name,
5216 TRAPS) const {
5217 if (!_need_verify) { return; }
5218
5219 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5220 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5221 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5222 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5223 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
5224 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5225 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
5226 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
5227 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
5228 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5229 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
5230 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
5231 const bool is_initializer = (name == vmSymbols::object_initializer_name());
5232
5233 bool is_illegal = false;
5234
5235 if (is_interface) {
5236 if (major_gte_8) {
5237 // Class file version is JAVA_8_VERSION or later Methods of
5238 // interfaces may set any of the flags except ACC_PROTECTED,
5239 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5240 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5241 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5242 (is_native || is_protected || is_final || is_synchronized) ||
5243 // If a specific method of a class or interface has its
5244 // ACC_ABSTRACT flag set, it must not have any of its
5245 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5246 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
5247 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5248 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5249 (is_abstract && (is_private || is_static || is_strict))) {
5250 is_illegal = true;
5251 }
5252 } else if (major_gte_1_5) {
5253 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5254 if (!is_public || is_private || is_protected || is_static || is_final ||
5255 is_synchronized || is_native || !is_abstract || is_strict) {
5256 is_illegal = true;
5257 }
5258 } else {
5259 // Class file version is pre-JAVA_1_5_VERSION
5260 if (!is_public || is_static || is_final || is_native || !is_abstract) {
5261 is_illegal = true;
5262 }
5263 }
5264 } else { // not interface
5265 if (has_illegal_visibility(flags)) {
5266 is_illegal = true;
5267 } else {
5268 if (is_initializer) {
5269 if (is_static || is_final || is_synchronized || is_native ||
5270 is_abstract || (major_gte_1_5 && is_bridge)) {
5271 is_illegal = true;
5272 }
5273 } else { // not initializer
5274 if (is_abstract) {
5275 if ((is_final || is_native || is_private || is_static ||
5276 (major_gte_1_5 && (is_synchronized || is_strict)))) {
5277 is_illegal = true;
5278 }
5279 }
5280 }
5281 }
5282 }
5283
5284 if (is_illegal) {
5285 ResourceMark rm(THREAD);
5286 Exceptions::fthrow(
5287 THREAD_AND_LOCATION,
5288 vmSymbols::java_lang_ClassFormatError(),
5289 "Method %s in class %s has illegal modifiers: 0x%X",
5290 name->as_C_string(), _class_name->as_C_string(), flags);
5291 return;
5292 }
5293 }
5294
verify_legal_utf8(const unsigned char * buffer,int length,TRAPS) const5295 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5296 int length,
5297 TRAPS) const {
5298 assert(_need_verify, "only called when _need_verify is true");
5299 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5300 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5301 }
5302 }
5303
5304 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5305 // In class names, '/' separates unqualified names. This is verified in this function also.
5306 // Method names also may not contain the characters '<' or '>', unless <init>
5307 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5308 // method. Because these names have been checked as special cases before
5309 // calling this method in verify_legal_method_name.
5310 //
5311 // This method is also called from the modular system APIs in modules.cpp
5312 // to verify the validity of module and package names.
verify_unqualified_name(const char * name,unsigned int length,int type)5313 bool ClassFileParser::verify_unqualified_name(const char* name,
5314 unsigned int length,
5315 int type) {
5316 if (length == 0) return false; // Must have at least one char.
5317 for (const char* p = name; p != name + length; p++) {
5318 switch(*p) {
5319 case JVM_SIGNATURE_DOT:
5320 case JVM_SIGNATURE_ENDCLASS:
5321 case JVM_SIGNATURE_ARRAY:
5322 // do not permit '.', ';', or '['
5323 return false;
5324 case JVM_SIGNATURE_SLASH:
5325 // check for '//' or leading or trailing '/' which are not legal
5326 // unqualified name must not be empty
5327 if (type == ClassFileParser::LegalClass) {
5328 if (p == name || p+1 >= name+length ||
5329 *(p+1) == JVM_SIGNATURE_SLASH) {
5330 return false;
5331 }
5332 } else {
5333 return false; // do not permit '/' unless it's class name
5334 }
5335 break;
5336 case JVM_SIGNATURE_SPECIAL:
5337 case JVM_SIGNATURE_ENDSPECIAL:
5338 // do not permit '<' or '>' in method names
5339 if (type == ClassFileParser::LegalMethod) {
5340 return false;
5341 }
5342 }
5343 }
5344 return true;
5345 }
5346
5347 // Take pointer to a UTF8 byte string (not NUL-terminated).
5348 // Skip over the longest part of the string that could
5349 // be taken as a fieldname. Allow '/' if slash_ok is true.
5350 // Return a pointer to just past the fieldname.
5351 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5352 // being true, we saw consecutive slashes (meaning we were looking for a
5353 // qualified path but found something that was badly-formed).
skip_over_field_name(const char * const name,bool slash_ok,unsigned int length)5354 static const char* skip_over_field_name(const char* const name,
5355 bool slash_ok,
5356 unsigned int length) {
5357 const char* p;
5358 jboolean last_is_slash = false;
5359 jboolean not_first_ch = false;
5360
5361 for (p = name; p != name + length; not_first_ch = true) {
5362 const char* old_p = p;
5363 jchar ch = *p;
5364 if (ch < 128) {
5365 p++;
5366 // quick check for ascii
5367 if ((ch >= 'a' && ch <= 'z') ||
5368 (ch >= 'A' && ch <= 'Z') ||
5369 (ch == '_' || ch == '$') ||
5370 (not_first_ch && ch >= '0' && ch <= '9')) {
5371 last_is_slash = false;
5372 continue;
5373 }
5374 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
5375 if (last_is_slash) {
5376 return NULL; // Don't permit consecutive slashes
5377 }
5378 last_is_slash = true;
5379 continue;
5380 }
5381 }
5382 else {
5383 jint unicode_ch;
5384 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5385 p = tmp_p;
5386 last_is_slash = false;
5387 // Check if ch is Java identifier start or is Java identifier part
5388 // 4672820: call java.lang.Character methods directly without generating separate tables.
5389 EXCEPTION_MARK;
5390 // return value
5391 JavaValue result(T_BOOLEAN);
5392 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
5393 JavaCallArguments args;
5394 args.push_int(unicode_ch);
5395
5396 if (not_first_ch) {
5397 // public static boolean isJavaIdentifierPart(char ch);
5398 JavaCalls::call_static(&result,
5399 SystemDictionary::Character_klass(),
5400 vmSymbols::isJavaIdentifierPart_name(),
5401 vmSymbols::int_bool_signature(),
5402 &args,
5403 THREAD);
5404 } else {
5405 // public static boolean isJavaIdentifierStart(char ch);
5406 JavaCalls::call_static(&result,
5407 SystemDictionary::Character_klass(),
5408 vmSymbols::isJavaIdentifierStart_name(),
5409 vmSymbols::int_bool_signature(),
5410 &args,
5411 THREAD);
5412 }
5413 if (HAS_PENDING_EXCEPTION) {
5414 CLEAR_PENDING_EXCEPTION;
5415 return NULL;
5416 }
5417 if(result.get_jboolean()) {
5418 continue;
5419 }
5420 }
5421 return (not_first_ch) ? old_p : NULL;
5422 }
5423 return (not_first_ch) ? p : NULL;
5424 }
5425
5426 // Take pointer to a UTF8 byte string (not NUL-terminated).
5427 // Skip over the longest part of the string that could
5428 // be taken as a field signature. Allow "void" if void_ok.
5429 // Return a pointer to just past the signature.
5430 // Return NULL if no legal signature is found.
skip_over_field_signature(const char * signature,bool void_ok,unsigned int length,TRAPS) const5431 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5432 bool void_ok,
5433 unsigned int length,
5434 TRAPS) const {
5435 unsigned int array_dim = 0;
5436 while (length > 0) {
5437 switch (signature[0]) {
5438 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5439 case JVM_SIGNATURE_BOOLEAN:
5440 case JVM_SIGNATURE_BYTE:
5441 case JVM_SIGNATURE_CHAR:
5442 case JVM_SIGNATURE_SHORT:
5443 case JVM_SIGNATURE_INT:
5444 case JVM_SIGNATURE_FLOAT:
5445 case JVM_SIGNATURE_LONG:
5446 case JVM_SIGNATURE_DOUBLE:
5447 return signature + 1;
5448 case JVM_SIGNATURE_CLASS: {
5449 if (_major_version < JAVA_1_5_VERSION) {
5450 // Skip over the class name if one is there
5451 const char* const p = skip_over_field_name(signature + 1, true, --length);
5452
5453 // The next character better be a semicolon
5454 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
5455 return p + 1;
5456 }
5457 }
5458 else {
5459 // Skip leading 'L' and ignore first appearance of ';'
5460 signature++;
5461 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
5462 // Format check signature
5463 if (c != NULL) {
5464 int newlen = c - (char*) signature;
5465 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5466 if (!legal) {
5467 classfile_parse_error("Class name is empty or contains illegal character "
5468 "in descriptor in class file %s",
5469 CHECK_NULL);
5470 return NULL;
5471 }
5472 return signature + newlen + 1;
5473 }
5474 }
5475 return NULL;
5476 }
5477 case JVM_SIGNATURE_ARRAY:
5478 array_dim++;
5479 if (array_dim > 255) {
5480 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5481 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_NULL);
5482 }
5483 // The rest of what's there better be a legal signature
5484 signature++;
5485 length--;
5486 void_ok = false;
5487 break;
5488 default:
5489 return NULL;
5490 }
5491 }
5492 return NULL;
5493 }
5494
5495 // Checks if name is a legal class name.
verify_legal_class_name(const Symbol * name,TRAPS) const5496 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5497 if (!_need_verify || _relax_verify) { return; }
5498
5499 assert(name->refcount() > 0, "symbol must be kept alive");
5500 char* bytes = (char*)name->bytes();
5501 unsigned int length = name->utf8_length();
5502 bool legal = false;
5503
5504 if (length > 0) {
5505 const char* p;
5506 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5507 p = skip_over_field_signature(bytes, false, length, CHECK);
5508 legal = (p != NULL) && ((p - bytes) == (int)length);
5509 } else if (_major_version < JAVA_1_5_VERSION) {
5510 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5511 p = skip_over_field_name(bytes, true, length);
5512 legal = (p != NULL) && ((p - bytes) == (int)length);
5513 }
5514 } else {
5515 // 4900761: relax the constraints based on JSR202 spec
5516 // Class names may be drawn from the entire Unicode character set.
5517 // Identifiers between '/' must be unqualified names.
5518 // The utf8 string has been verified when parsing cpool entries.
5519 legal = verify_unqualified_name(bytes, length, LegalClass);
5520 }
5521 }
5522 if (!legal) {
5523 ResourceMark rm(THREAD);
5524 assert(_class_name != NULL, "invariant");
5525 Exceptions::fthrow(
5526 THREAD_AND_LOCATION,
5527 vmSymbols::java_lang_ClassFormatError(),
5528 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5529 _class_name->as_C_string()
5530 );
5531 return;
5532 }
5533 }
5534
5535 // Checks if name is a legal field name.
verify_legal_field_name(const Symbol * name,TRAPS) const5536 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5537 if (!_need_verify || _relax_verify) { return; }
5538
5539 char* bytes = (char*)name->bytes();
5540 unsigned int length = name->utf8_length();
5541 bool legal = false;
5542
5543 if (length > 0) {
5544 if (_major_version < JAVA_1_5_VERSION) {
5545 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5546 const char* p = skip_over_field_name(bytes, false, length);
5547 legal = (p != NULL) && ((p - bytes) == (int)length);
5548 }
5549 } else {
5550 // 4881221: relax the constraints based on JSR202 spec
5551 legal = verify_unqualified_name(bytes, length, LegalField);
5552 }
5553 }
5554
5555 if (!legal) {
5556 ResourceMark rm(THREAD);
5557 assert(_class_name != NULL, "invariant");
5558 Exceptions::fthrow(
5559 THREAD_AND_LOCATION,
5560 vmSymbols::java_lang_ClassFormatError(),
5561 "Illegal field name \"%.*s\" in class %s", length, bytes,
5562 _class_name->as_C_string()
5563 );
5564 return;
5565 }
5566 }
5567
5568 // Checks if name is a legal method name.
verify_legal_method_name(const Symbol * name,TRAPS) const5569 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5570 if (!_need_verify || _relax_verify) { return; }
5571
5572 assert(name != NULL, "method name is null");
5573 char* bytes = (char*)name->bytes();
5574 unsigned int length = name->utf8_length();
5575 bool legal = false;
5576
5577 if (length > 0) {
5578 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5579 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5580 legal = true;
5581 }
5582 } else if (_major_version < JAVA_1_5_VERSION) {
5583 const char* p;
5584 p = skip_over_field_name(bytes, false, length);
5585 legal = (p != NULL) && ((p - bytes) == (int)length);
5586 } else {
5587 // 4881221: relax the constraints based on JSR202 spec
5588 legal = verify_unqualified_name(bytes, length, LegalMethod);
5589 }
5590 }
5591
5592 if (!legal) {
5593 ResourceMark rm(THREAD);
5594 assert(_class_name != NULL, "invariant");
5595 Exceptions::fthrow(
5596 THREAD_AND_LOCATION,
5597 vmSymbols::java_lang_ClassFormatError(),
5598 "Illegal method name \"%.*s\" in class %s", length, bytes,
5599 _class_name->as_C_string()
5600 );
5601 return;
5602 }
5603 }
5604
5605
5606 // Checks if signature is a legal field signature.
verify_legal_field_signature(const Symbol * name,const Symbol * signature,TRAPS) const5607 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5608 const Symbol* signature,
5609 TRAPS) const {
5610 if (!_need_verify) { return; }
5611
5612 const char* const bytes = (const char* const)signature->bytes();
5613 const unsigned int length = signature->utf8_length();
5614 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5615
5616 if (p == NULL || (p - bytes) != (int)length) {
5617 throwIllegalSignature("Field", name, signature, CHECK);
5618 }
5619 }
5620
5621 // Checks if signature is a legal method signature.
5622 // Returns number of parameters
verify_legal_method_signature(const Symbol * name,const Symbol * signature,TRAPS) const5623 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5624 const Symbol* signature,
5625 TRAPS) const {
5626 if (!_need_verify) {
5627 // make sure caller's args_size will be less than 0 even for non-static
5628 // method so it will be recomputed in compute_size_of_parameters().
5629 return -2;
5630 }
5631
5632 // Class initializers cannot have args for class format version >= 51.
5633 if (name == vmSymbols::class_initializer_name() &&
5634 signature != vmSymbols::void_method_signature() &&
5635 _major_version >= JAVA_7_VERSION) {
5636 throwIllegalSignature("Method", name, signature, CHECK_0);
5637 return 0;
5638 }
5639
5640 unsigned int args_size = 0;
5641 const char* p = (const char*)signature->bytes();
5642 unsigned int length = signature->utf8_length();
5643 const char* nextp;
5644
5645 // The first character must be a '('
5646 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5647 length--;
5648 // Skip over legal field signatures
5649 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5650 while ((length > 0) && (nextp != NULL)) {
5651 args_size++;
5652 if (p[0] == 'J' || p[0] == 'D') {
5653 args_size++;
5654 }
5655 length -= nextp - p;
5656 p = nextp;
5657 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5658 }
5659 // The first non-signature thing better be a ')'
5660 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5661 length--;
5662 if (name->utf8_length() > 0 && name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
5663 // All internal methods must return void
5664 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5665 return args_size;
5666 }
5667 } else {
5668 // Now we better just have a return value
5669 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5670 if (nextp && ((int)length == (nextp - p))) {
5671 return args_size;
5672 }
5673 }
5674 }
5675 }
5676 // Report error
5677 throwIllegalSignature("Method", name, signature, CHECK_0);
5678 return 0;
5679 }
5680
static_field_size() const5681 int ClassFileParser::static_field_size() const {
5682 assert(_field_info != NULL, "invariant");
5683 return _field_info->_static_field_size;
5684 }
5685
total_oop_map_count() const5686 int ClassFileParser::total_oop_map_count() const {
5687 assert(_field_info != NULL, "invariant");
5688 return _field_info->oop_map_blocks->_nonstatic_oop_map_count;
5689 }
5690
layout_size() const5691 jint ClassFileParser::layout_size() const {
5692 assert(_field_info != NULL, "invariant");
5693 return _field_info->_instance_size;
5694 }
5695
check_methods_for_intrinsics(const InstanceKlass * ik,const Array<Method * > * methods)5696 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5697 const Array<Method*>* methods) {
5698 assert(ik != NULL, "invariant");
5699 assert(methods != NULL, "invariant");
5700
5701 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5702 // (We used to do this lazily, but now we query it in Rewriter,
5703 // which is eagerly done for every method, so we might as well do it now,
5704 // when everything is fresh in memory.)
5705 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5706
5707 if (klass_id != vmSymbols::NO_SID) {
5708 for (int j = 0; j < methods->length(); ++j) {
5709 Method* method = methods->at(j);
5710 method->init_intrinsic_id();
5711
5712 if (CheckIntrinsics) {
5713 // Check if an intrinsic is defined for method 'method',
5714 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5715 if (method->intrinsic_id() != vmIntrinsics::_none &&
5716 !method->intrinsic_candidate()) {
5717 tty->print("Compiler intrinsic is defined for method [%s], "
5718 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5719 method->name_and_sig_as_C_string(),
5720 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5721 );
5722 tty->cr();
5723 DEBUG_ONLY(vm_exit(1));
5724 }
5725 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5726 // but there is no intrinsic available for it.
5727 if (method->intrinsic_candidate() &&
5728 method->intrinsic_id() == vmIntrinsics::_none) {
5729 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5730 "but no compiler intrinsic is defined for the method.%s",
5731 method->name_and_sig_as_C_string(),
5732 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5733 );
5734 tty->cr();
5735 DEBUG_ONLY(vm_exit(1));
5736 }
5737 }
5738 } // end for
5739
5740 #ifdef ASSERT
5741 if (CheckIntrinsics) {
5742 // Check for orphan methods in the current class. A method m
5743 // of a class C is orphan if an intrinsic is defined for method m,
5744 // but class C does not declare m.
5745 // The check is potentially expensive, therefore it is available
5746 // only in debug builds.
5747
5748 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5749 if (vmIntrinsics::_compiledLambdaForm == id) {
5750 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5751 // generated for the JVM from a LambdaForm and therefore no method
5752 // is defined for it.
5753 continue;
5754 }
5755
5756 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5757 // Check if the current class contains a method with the same
5758 // name, flags, signature.
5759 bool match = false;
5760 for (int j = 0; j < methods->length(); ++j) {
5761 const Method* method = methods->at(j);
5762 if (method->intrinsic_id() == id) {
5763 match = true;
5764 break;
5765 }
5766 }
5767
5768 if (!match) {
5769 char buf[1000];
5770 tty->print("Compiler intrinsic is defined for method [%s], "
5771 "but the method is not available in class [%s].%s",
5772 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5773 buf, sizeof(buf)),
5774 ik->name()->as_C_string(),
5775 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5776 );
5777 tty->cr();
5778 DEBUG_ONLY(vm_exit(1));
5779 }
5780 }
5781 } // end for
5782 } // CheckIntrinsics
5783 #endif // ASSERT
5784 }
5785 }
5786
create_instance_klass(bool changed_by_loadhook,const ClassInstanceInfo & cl_inst_info,TRAPS)5787 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5788 const ClassInstanceInfo& cl_inst_info,
5789 TRAPS) {
5790 if (_klass != NULL) {
5791 return _klass;
5792 }
5793
5794 InstanceKlass* const ik =
5795 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5796
5797 if (is_hidden()) {
5798 mangle_hidden_class_name(ik);
5799 }
5800
5801 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5802
5803 assert(_klass == ik, "invariant");
5804
5805
5806 if (ik->should_store_fingerprint()) {
5807 ik->store_fingerprint(_stream->compute_fingerprint());
5808 }
5809
5810 ik->set_has_passed_fingerprint_check(false);
5811 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5812 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5813 uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint();
5814 if (aot_fp != 0 && aot_fp == fp) {
5815 // This class matches with a class saved in an AOT library
5816 ik->set_has_passed_fingerprint_check(true);
5817 } else {
5818 ResourceMark rm;
5819 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5820 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5821 }
5822 }
5823
5824 return ik;
5825 }
5826
fill_instance_klass(InstanceKlass * ik,bool changed_by_loadhook,const ClassInstanceInfo & cl_inst_info,TRAPS)5827 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5828 bool changed_by_loadhook,
5829 const ClassInstanceInfo& cl_inst_info,
5830 TRAPS) {
5831 assert(ik != NULL, "invariant");
5832
5833 // Set name and CLD before adding to CLD
5834 ik->set_class_loader_data(_loader_data);
5835 ik->set_name(_class_name);
5836
5837 // Add all classes to our internal class loader list here,
5838 // including classes in the bootstrap (NULL) class loader.
5839 const bool publicize = !is_internal();
5840
5841 _loader_data->add_class(ik, publicize);
5842
5843 set_klass_to_deallocate(ik);
5844
5845 assert(_field_info != NULL, "invariant");
5846 assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5847 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5848 "sanity");
5849
5850 assert(ik->is_instance_klass(), "sanity");
5851 assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5852
5853 // Fill in information already parsed
5854 ik->set_should_verify_class(_need_verify);
5855
5856 // Not yet: supers are done below to support the new subtype-checking fields
5857 ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5858 ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5859 assert(_fac != NULL, "invariant");
5860 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5861
5862 // this transfers ownership of a lot of arrays from
5863 // the parser onto the InstanceKlass*
5864 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5865
5866 // can only set dynamic nest-host after static nest information is set
5867 if (cl_inst_info.dynamic_nest_host() != NULL) {
5868 ik->set_nest_host(cl_inst_info.dynamic_nest_host(), THREAD);
5869 }
5870
5871 // note that is not safe to use the fields in the parser from this point on
5872 assert(NULL == _cp, "invariant");
5873 assert(NULL == _fields, "invariant");
5874 assert(NULL == _methods, "invariant");
5875 assert(NULL == _inner_classes, "invariant");
5876 assert(NULL == _nest_members, "invariant");
5877 assert(NULL == _combined_annotations, "invariant");
5878 assert(NULL == _record_components, "invariant");
5879 assert(NULL == _permitted_subclasses, "invariant");
5880
5881 if (_has_final_method) {
5882 ik->set_has_final_method();
5883 }
5884
5885 ik->copy_method_ordering(_method_ordering, CHECK);
5886 // The InstanceKlass::_methods_jmethod_ids cache
5887 // is managed on the assumption that the initial cache
5888 // size is equal to the number of methods in the class. If
5889 // that changes, then InstanceKlass::idnum_can_increment()
5890 // has to be changed accordingly.
5891 ik->set_initial_method_idnum(ik->methods()->length());
5892
5893 ik->set_this_class_index(_this_class_index);
5894
5895 if (_is_hidden || is_unsafe_anonymous()) {
5896 // _this_class_index is a CONSTANT_Class entry that refers to this
5897 // hidden or anonymous class itself. If this class needs to refer to its own
5898 // methods or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5899 // _this_class_index. However, because this class is hidden or anonymous (it's
5900 // not stored in SystemDictionary), _this_class_index cannot be resolved
5901 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5902 // Therefore, we must eagerly resolve _this_class_index now.
5903 ik->constants()->klass_at_put(_this_class_index, ik);
5904 }
5905
5906 ik->set_minor_version(_minor_version);
5907 ik->set_major_version(_major_version);
5908 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5909 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5910
5911 if (_unsafe_anonymous_host != NULL) {
5912 assert (ik->is_unsafe_anonymous(), "should be the same");
5913 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host);
5914 }
5915 if (_is_hidden) {
5916 ik->set_is_hidden();
5917 }
5918
5919 // Set PackageEntry for this_klass
5920 oop cl = ik->class_loader();
5921 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5922 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5923 ik->set_package(cld, NULL, CHECK);
5924
5925 const Array<Method*>* const methods = ik->methods();
5926 assert(methods != NULL, "invariant");
5927 const int methods_len = methods->length();
5928
5929 check_methods_for_intrinsics(ik, methods);
5930
5931 // Fill in field values obtained by parse_classfile_attributes
5932 if (_parsed_annotations->has_any_annotations()) {
5933 _parsed_annotations->apply_to(ik);
5934 }
5935
5936 apply_parsed_class_attributes(ik);
5937
5938 // Miranda methods
5939 if ((_num_miranda_methods > 0) ||
5940 // if this class introduced new miranda methods or
5941 (_super_klass != NULL && _super_klass->has_miranda_methods())
5942 // super class exists and this class inherited miranda methods
5943 ) {
5944 ik->set_has_miranda_methods(); // then set a flag
5945 }
5946
5947 // Fill in information needed to compute superclasses.
5948 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5949 ik->set_transitive_interfaces(_transitive_interfaces);
5950 ik->set_local_interfaces(_local_interfaces);
5951 _transitive_interfaces = NULL;
5952 _local_interfaces = NULL;
5953
5954 // Initialize itable offset tables
5955 klassItable::setup_itable_offset_table(ik);
5956
5957 // Compute transitive closure of interfaces this class implements
5958 // Do final class setup
5959 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5960 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5961 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5962 }
5963
5964 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5965 ( _super_klass != NULL && _super_klass->has_contended_annotations())) {
5966 ik->set_has_contended_annotations(true);
5967 }
5968
5969 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5970 set_precomputed_flags(ik);
5971
5972 // check if this class can access its super class
5973 check_super_class_access(ik, CHECK);
5974
5975 // check if this class can access its superinterfaces
5976 check_super_interface_access(ik, CHECK);
5977
5978 // check if this class overrides any final method
5979 check_final_method_override(ik, CHECK);
5980
5981 // reject static interface methods prior to Java 8
5982 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5983 check_illegal_static_method(ik, CHECK);
5984 }
5985
5986 // Obtain this_klass' module entry
5987 ModuleEntry* module_entry = ik->module();
5988 assert(module_entry != NULL, "module_entry should always be set");
5989
5990 // Obtain java.lang.Module
5991 Handle module_handle(THREAD, module_entry->module());
5992
5993 // Allocate mirror and initialize static fields
5994 // The create_mirror() call will also call compute_modifiers()
5995 java_lang_Class::create_mirror(ik,
5996 Handle(THREAD, _loader_data->class_loader()),
5997 module_handle,
5998 _protection_domain,
5999 cl_inst_info.class_data(),
6000 CHECK);
6001
6002 assert(_all_mirandas != NULL, "invariant");
6003
6004 // Generate any default methods - default methods are public interface methods
6005 // that have a default implementation. This is new with Java 8.
6006 if (_has_nonstatic_concrete_methods) {
6007 DefaultMethods::generate_default_methods(ik,
6008 _all_mirandas,
6009 CHECK);
6010 }
6011
6012 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
6013 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
6014 !module_entry->has_default_read_edges()) {
6015 if (!module_entry->set_has_default_read_edges()) {
6016 // We won a potential race
6017 JvmtiExport::add_default_read_edges(module_handle, THREAD);
6018 }
6019 }
6020
6021 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
6022
6023 if (!is_internal()) {
6024 if (log_is_enabled(Info, class, load)) {
6025 ResourceMark rm;
6026 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
6027 ik->print_class_load_logging(_loader_data, module_name, _stream);
6028 }
6029
6030 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
6031 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
6032 log_is_enabled(Info, class, preview)) {
6033 ResourceMark rm;
6034 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
6035 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
6036 }
6037
6038 if (log_is_enabled(Debug, class, resolve)) {
6039 ResourceMark rm;
6040 // print out the superclass.
6041 const char * from = ik->external_name();
6042 if (ik->java_super() != NULL) {
6043 log_debug(class, resolve)("%s %s (super)",
6044 from,
6045 ik->java_super()->external_name());
6046 }
6047 // print out each of the interface classes referred to by this class.
6048 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
6049 if (local_interfaces != NULL) {
6050 const int length = local_interfaces->length();
6051 for (int i = 0; i < length; i++) {
6052 const InstanceKlass* const k = local_interfaces->at(i);
6053 const char * to = k->external_name();
6054 log_debug(class, resolve)("%s %s (interface)", from, to);
6055 }
6056 }
6057 }
6058 }
6059
6060 JFR_ONLY(INIT_ID(ik);)
6061
6062 // If we reach here, all is well.
6063 // Now remove the InstanceKlass* from the _klass_to_deallocate field
6064 // in order for it to not be destroyed in the ClassFileParser destructor.
6065 set_klass_to_deallocate(NULL);
6066
6067 // it's official
6068 set_klass(ik);
6069
6070 debug_only(ik->verify();)
6071 }
6072
update_class_name(Symbol * new_class_name)6073 void ClassFileParser::update_class_name(Symbol* new_class_name) {
6074 // Decrement the refcount in the old name, since we're clobbering it.
6075 _class_name->decrement_refcount();
6076
6077 _class_name = new_class_name;
6078 // Increment the refcount of the new name.
6079 // Now the ClassFileParser owns this name and will decrement in
6080 // the destructor.
6081 _class_name->increment_refcount();
6082 }
6083
6084 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's
6085 // package by prepending its host class's package name to its class name and setting
6086 // its _class_name field.
prepend_host_package_name(const InstanceKlass * unsafe_anonymous_host,TRAPS)6087 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) {
6088 ResourceMark rm(THREAD);
6089 assert(strrchr(_class_name->as_C_string(), JVM_SIGNATURE_SLASH) == NULL,
6090 "Unsafe anonymous class should not be in a package");
6091 TempNewSymbol host_pkg_name =
6092 ClassLoader::package_from_class_name(unsafe_anonymous_host->name());
6093
6094 if (host_pkg_name != NULL) {
6095 int host_pkg_len = host_pkg_name->utf8_length();
6096 int class_name_len = _class_name->utf8_length();
6097 int symbol_len = host_pkg_len + 1 + class_name_len;
6098 char* new_anon_name = NEW_RESOURCE_ARRAY(char, symbol_len + 1);
6099 int n = os::snprintf(new_anon_name, symbol_len + 1, "%.*s/%.*s",
6100 host_pkg_len, host_pkg_name->base(), class_name_len, _class_name->base());
6101 assert(n == symbol_len, "Unexpected number of characters in string");
6102
6103 // Decrement old _class_name to avoid leaking.
6104 _class_name->decrement_refcount();
6105
6106 // Create a symbol and update the anonymous class name.
6107 // The new class name is created with a refcount of one. When installed into the InstanceKlass,
6108 // it'll be two and when the ClassFileParser destructor runs, it'll go back to one and get deleted
6109 // when the class is unloaded.
6110 _class_name = SymbolTable::new_symbol(new_anon_name, symbol_len);
6111 }
6112 }
6113
6114 // If the host class and the anonymous class are in the same package then do
6115 // nothing. If the anonymous class is in the unnamed package then move it to its
6116 // host's package. If the classes are in different packages then throw an IAE
6117 // exception.
fix_unsafe_anonymous_class_name(TRAPS)6118 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) {
6119 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class");
6120
6121 const jbyte* anon_last_slash = UTF8::strrchr((const jbyte*)_class_name->base(),
6122 _class_name->utf8_length(), JVM_SIGNATURE_SLASH);
6123 if (anon_last_slash == NULL) { // Unnamed package
6124 prepend_host_package_name(_unsafe_anonymous_host, CHECK);
6125 } else {
6126 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) {
6127 ResourceMark rm(THREAD);
6128 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
6129 err_msg("Host class %s and anonymous class %s are in different packages",
6130 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string()));
6131 }
6132 }
6133 }
6134
relax_format_check_for(ClassLoaderData * loader_data)6135 static bool relax_format_check_for(ClassLoaderData* loader_data) {
6136 bool trusted = loader_data->is_boot_class_loader_data() ||
6137 loader_data->is_platform_class_loader_data();
6138 bool need_verify =
6139 // verifyAll
6140 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
6141 // verifyRemote
6142 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
6143 return !need_verify;
6144 }
6145
ClassFileParser(ClassFileStream * stream,Symbol * name,ClassLoaderData * loader_data,const ClassLoadInfo * cl_info,Publicity pub_level,TRAPS)6146 ClassFileParser::ClassFileParser(ClassFileStream* stream,
6147 Symbol* name,
6148 ClassLoaderData* loader_data,
6149 const ClassLoadInfo* cl_info,
6150 Publicity pub_level,
6151 TRAPS) :
6152 _stream(stream),
6153 _class_name(NULL),
6154 _loader_data(loader_data),
6155 _unsafe_anonymous_host(cl_info->unsafe_anonymous_host()),
6156 _cp_patches(cl_info->cp_patches()),
6157 _is_hidden(cl_info->is_hidden()),
6158 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
6159 _num_patched_klasses(0),
6160 _max_num_patched_klasses(0),
6161 _orig_cp_size(0),
6162 _first_patched_klass_resolved_index(0),
6163 _super_klass(),
6164 _cp(NULL),
6165 _fields(NULL),
6166 _methods(NULL),
6167 _inner_classes(NULL),
6168 _nest_members(NULL),
6169 _nest_host(0),
6170 _permitted_subclasses(NULL),
6171 _record_components(NULL),
6172 _local_interfaces(NULL),
6173 _transitive_interfaces(NULL),
6174 _combined_annotations(NULL),
6175 _class_annotations(NULL),
6176 _class_type_annotations(NULL),
6177 _fields_annotations(NULL),
6178 _fields_type_annotations(NULL),
6179 _klass(NULL),
6180 _klass_to_deallocate(NULL),
6181 _parsed_annotations(NULL),
6182 _fac(NULL),
6183 _field_info(NULL),
6184 _method_ordering(NULL),
6185 _all_mirandas(NULL),
6186 _vtable_size(0),
6187 _itable_size(0),
6188 _num_miranda_methods(0),
6189 _rt(REF_NONE),
6190 _protection_domain(cl_info->protection_domain()),
6191 _access_flags(),
6192 _pub_level(pub_level),
6193 _bad_constant_seen(0),
6194 _synthetic_flag(false),
6195 _sde_length(false),
6196 _sde_buffer(NULL),
6197 _sourcefile_index(0),
6198 _generic_signature_index(0),
6199 _major_version(0),
6200 _minor_version(0),
6201 _this_class_index(0),
6202 _super_class_index(0),
6203 _itfs_len(0),
6204 _java_fields_count(0),
6205 _need_verify(false),
6206 _relax_verify(false),
6207 _has_nonstatic_concrete_methods(false),
6208 _declares_nonstatic_concrete_methods(false),
6209 _has_final_method(false),
6210 _has_contended_fields(false),
6211 _has_finalizer(false),
6212 _has_empty_finalizer(false),
6213 _has_vanilla_constructor(false),
6214 _max_bootstrap_specifier_index(-1) {
6215
6216 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6217 _class_name->increment_refcount();
6218
6219 assert(THREAD->is_Java_thread(), "invariant");
6220 assert(_loader_data != NULL, "invariant");
6221 assert(stream != NULL, "invariant");
6222 assert(_stream != NULL, "invariant");
6223 assert(_stream->buffer() == _stream->current(), "invariant");
6224 assert(_class_name != NULL, "invariant");
6225 assert(0 == _access_flags.as_int(), "invariant");
6226
6227 // Figure out whether we can skip format checking (matching classic VM behavior)
6228 if (DumpSharedSpaces) {
6229 // verify == true means it's a 'remote' class (i.e., non-boot class)
6230 // Verification decision is based on BytecodeVerificationRemote flag
6231 // for those classes.
6232 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
6233 BytecodeVerificationLocal;
6234 }
6235 else {
6236 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
6237 stream->need_verify());
6238 }
6239 if (_cp_patches != NULL) {
6240 int len = _cp_patches->length();
6241 for (int i=0; i<len; i++) {
6242 if (has_cp_patch_at(i)) {
6243 Handle patch = cp_patch_at(i);
6244 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
6245 // We need to append the names of the patched classes to the end of the constant pool,
6246 // because a patched class may have a Utf8 name that's not already included in the
6247 // original constant pool. These class names are used when patch_constant_pool()
6248 // calls patch_class().
6249 //
6250 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
6251 // At this point, we don't know the tag for index i yet, because we haven't parsed the
6252 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
6253 _max_num_patched_klasses++;
6254 }
6255 }
6256 }
6257 }
6258
6259 // synch back verification state to stream
6260 stream->set_verify(_need_verify);
6261
6262 // Check if verification needs to be relaxed for this class file
6263 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
6264 _relax_verify = relax_format_check_for(_loader_data);
6265
6266 parse_stream(stream, CHECK);
6267
6268 post_process_parsed_stream(stream, _cp, CHECK);
6269 }
6270
clear_class_metadata()6271 void ClassFileParser::clear_class_metadata() {
6272 // metadata created before the instance klass is created. Must be
6273 // deallocated if classfile parsing returns an error.
6274 _cp = NULL;
6275 _fields = NULL;
6276 _methods = NULL;
6277 _inner_classes = NULL;
6278 _nest_members = NULL;
6279 _permitted_subclasses = NULL;
6280 _combined_annotations = NULL;
6281 _class_annotations = _class_type_annotations = NULL;
6282 _fields_annotations = _fields_type_annotations = NULL;
6283 _record_components = NULL;
6284 }
6285
6286 // Destructor to clean up
~ClassFileParser()6287 ClassFileParser::~ClassFileParser() {
6288 _class_name->decrement_refcount();
6289
6290 if (_cp != NULL) {
6291 MetadataFactory::free_metadata(_loader_data, _cp);
6292 }
6293 if (_fields != NULL) {
6294 MetadataFactory::free_array<u2>(_loader_data, _fields);
6295 }
6296
6297 if (_methods != NULL) {
6298 // Free methods
6299 InstanceKlass::deallocate_methods(_loader_data, _methods);
6300 }
6301
6302 // beware of the Universe::empty_blah_array!!
6303 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6304 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6305 }
6306
6307 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
6308 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6309 }
6310
6311 if (_record_components != NULL) {
6312 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
6313 }
6314
6315 if (_permitted_subclasses != NULL && _permitted_subclasses != Universe::the_empty_short_array()) {
6316 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
6317 }
6318
6319 // Free interfaces
6320 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6321 _local_interfaces, _transitive_interfaces);
6322
6323 if (_combined_annotations != NULL) {
6324 // After all annotations arrays have been created, they are installed into the
6325 // Annotations object that will be assigned to the InstanceKlass being created.
6326
6327 // Deallocate the Annotations object and the installed annotations arrays.
6328 _combined_annotations->deallocate_contents(_loader_data);
6329
6330 // If the _combined_annotations pointer is non-NULL,
6331 // then the other annotations fields should have been cleared.
6332 assert(_class_annotations == NULL, "Should have been cleared");
6333 assert(_class_type_annotations == NULL, "Should have been cleared");
6334 assert(_fields_annotations == NULL, "Should have been cleared");
6335 assert(_fields_type_annotations == NULL, "Should have been cleared");
6336 } else {
6337 // If the annotations arrays were not installed into the Annotations object,
6338 // then they have to be deallocated explicitly.
6339 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
6340 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
6341 Annotations::free_contents(_loader_data, _fields_annotations);
6342 Annotations::free_contents(_loader_data, _fields_type_annotations);
6343 }
6344
6345 clear_class_metadata();
6346 _transitive_interfaces = NULL;
6347 _local_interfaces = NULL;
6348
6349 // deallocate the klass if already created. Don't directly deallocate, but add
6350 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6351 // at a safepoint.
6352 if (_klass_to_deallocate != NULL) {
6353 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6354 }
6355 }
6356
parse_stream(const ClassFileStream * const stream,TRAPS)6357 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6358 TRAPS) {
6359
6360 assert(stream != NULL, "invariant");
6361 assert(_class_name != NULL, "invariant");
6362
6363 // BEGIN STREAM PARSING
6364 stream->guarantee_more(8, CHECK); // magic, major, minor
6365 // Magic value
6366 const u4 magic = stream->get_u4_fast();
6367 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6368 "Incompatible magic value %u in class file %s",
6369 magic, CHECK);
6370
6371 // Version numbers
6372 _minor_version = stream->get_u2_fast();
6373 _major_version = stream->get_u2_fast();
6374
6375 if (DumpSharedSpaces && _major_version < JAVA_6_VERSION) {
6376 ResourceMark rm;
6377 warning("Pre JDK 6 class not supported by CDS: %u.%u %s",
6378 _major_version, _minor_version, _class_name->as_C_string());
6379 Exceptions::fthrow(
6380 THREAD_AND_LOCATION,
6381 vmSymbols::java_lang_UnsupportedClassVersionError(),
6382 "Unsupported major.minor version for dump time %u.%u",
6383 _major_version,
6384 _minor_version);
6385 }
6386
6387 // Check version numbers - we check this even with verifier off
6388 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6389
6390 stream->guarantee_more(3, CHECK); // length, first cp tag
6391 u2 cp_size = stream->get_u2_fast();
6392
6393 guarantee_property(
6394 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6395 cp_size, CHECK);
6396
6397 _orig_cp_size = cp_size;
6398 if (is_hidden()) { // Add a slot for hidden class name.
6399 assert(_max_num_patched_klasses == 0, "Sanity check");
6400 cp_size++;
6401 } else {
6402 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6403 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6404 }
6405 cp_size += _max_num_patched_klasses;
6406 }
6407
6408 _cp = ConstantPool::allocate(_loader_data,
6409 cp_size,
6410 CHECK);
6411
6412 ConstantPool* const cp = _cp;
6413
6414 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6415
6416 assert(cp_size == (const u2)cp->length(), "invariant");
6417
6418 // ACCESS FLAGS
6419 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6420
6421 // Access flags
6422 jint flags;
6423 // JVM_ACC_MODULE is defined in JDK-9 and later.
6424 if (_major_version >= JAVA_9_VERSION) {
6425 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
6426 } else {
6427 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
6428 }
6429
6430 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6431 // Set abstract bit for old class files for backward compatibility
6432 flags |= JVM_ACC_ABSTRACT;
6433 }
6434
6435 verify_legal_class_modifiers(flags, CHECK);
6436
6437 short bad_constant = class_bad_constant_seen();
6438 if (bad_constant != 0) {
6439 // Do not throw CFE until after the access_flags are checked because if
6440 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6441 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6442 }
6443
6444 _access_flags.set_flags(flags);
6445
6446 // This class and superclass
6447 _this_class_index = stream->get_u2_fast();
6448 check_property(
6449 valid_cp_range(_this_class_index, cp_size) &&
6450 cp->tag_at(_this_class_index).is_unresolved_klass(),
6451 "Invalid this class index %u in constant pool in class file %s",
6452 _this_class_index, CHECK);
6453
6454 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6455 assert(class_name_in_cp != NULL, "class_name can't be null");
6456
6457 // Don't need to check whether this class name is legal or not.
6458 // It has been checked when constant pool is parsed.
6459 // However, make sure it is not an array type.
6460 if (_need_verify) {
6461 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
6462 "Bad class name in class file %s",
6463 CHECK);
6464 }
6465
6466 #ifdef ASSERT
6467 // Basic sanity checks
6468 assert(!(_is_hidden && (_unsafe_anonymous_host != NULL)), "mutually exclusive variants");
6469
6470 if (_unsafe_anonymous_host != NULL) {
6471 assert(_class_name == vmSymbols::unknown_class_name(), "A named anonymous class???");
6472 }
6473 if (_is_hidden) {
6474 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
6475 }
6476 #endif
6477
6478 // Update the _class_name as needed depending on whether this is a named,
6479 // un-named, hidden or unsafe-anonymous class.
6480
6481 if (_is_hidden) {
6482 assert(_class_name != NULL, "Unexpected null _class_name");
6483 #ifdef ASSERT
6484 if (_need_verify) {
6485 verify_legal_class_name(_class_name, CHECK);
6486 }
6487 #endif
6488
6489 // NOTE: !_is_hidden does not imply "findable" as it could be an old-style
6490 // "hidden" unsafe-anonymous class
6491
6492 // If this is an anonymous class fix up its name if it is in the unnamed
6493 // package. Otherwise, throw IAE if it is in a different package than
6494 // its host class.
6495 } else if (_unsafe_anonymous_host != NULL) {
6496 update_class_name(class_name_in_cp);
6497 fix_unsafe_anonymous_class_name(CHECK);
6498
6499 } else {
6500 // Check if name in class file matches given name
6501 if (_class_name != class_name_in_cp) {
6502 if (_class_name != vmSymbols::unknown_class_name()) {
6503 ResourceMark rm(THREAD);
6504 Exceptions::fthrow(THREAD_AND_LOCATION,
6505 vmSymbols::java_lang_NoClassDefFoundError(),
6506 "%s (wrong name: %s)",
6507 class_name_in_cp->as_C_string(),
6508 _class_name->as_C_string()
6509 );
6510 return;
6511 } else {
6512 // The class name was not known by the caller so we set it from
6513 // the value in the CP.
6514 update_class_name(class_name_in_cp);
6515 }
6516 // else nothing to do: the expected class name matches what is in the CP
6517 }
6518 }
6519
6520 // Verification prevents us from creating names with dots in them, this
6521 // asserts that that's the case.
6522 assert(is_internal_format(_class_name), "external class name format used internally");
6523
6524 if (!is_internal()) {
6525 LogTarget(Debug, class, preorder) lt;
6526 if (lt.is_enabled()){
6527 ResourceMark rm(THREAD);
6528 LogStream ls(lt);
6529 ls.print("%s", _class_name->as_klass_external_name());
6530 if (stream->source() != NULL) {
6531 ls.print(" source: %s", stream->source());
6532 }
6533 ls.cr();
6534 }
6535
6536 #if INCLUDE_CDS
6537 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6538 if (!ClassLoader::has_jrt_entry()) {
6539 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6540 DumpLoadedClassList = NULL;
6541 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6542 !_is_hidden &&
6543 _unsafe_anonymous_host == NULL) {
6544 // Only dump the classes that can be stored into CDS archive.
6545 // Hidden and unsafe anonymous classes such as generated LambdaForm classes are also not included.
6546 oop class_loader = _loader_data->class_loader();
6547 ResourceMark rm(THREAD);
6548 bool skip = false;
6549 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6550 // For the boot and platform class loaders, skip classes that are not found in the
6551 // java runtime image, such as those found in the --patch-module entries.
6552 // These classes can't be loaded from the archive during runtime.
6553 if (!stream->from_boot_loader_modules_image() && strncmp(stream->source(), "jrt:", 4) != 0) {
6554 skip = true;
6555 }
6556
6557 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6558 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6559 // as they can be loaded from the archive during runtime.
6560 skip = false;
6561 }
6562 }
6563 if (skip) {
6564 tty->print_cr("skip writing class %s from source %s to classlist file",
6565 _class_name->as_C_string(), stream->source());
6566 } else {
6567 classlist_file->print_cr("%s", _class_name->as_C_string());
6568 classlist_file->flush();
6569 }
6570 }
6571 }
6572 #endif
6573 }
6574
6575 // SUPERKLASS
6576 _super_class_index = stream->get_u2_fast();
6577 _super_klass = parse_super_class(cp,
6578 _super_class_index,
6579 _need_verify,
6580 CHECK);
6581
6582 // Interfaces
6583 _itfs_len = stream->get_u2_fast();
6584 parse_interfaces(stream,
6585 _itfs_len,
6586 cp,
6587 &_has_nonstatic_concrete_methods,
6588 CHECK);
6589
6590 assert(_local_interfaces != NULL, "invariant");
6591
6592 // Fields (offsets are filled in later)
6593 _fac = new FieldAllocationCount();
6594 parse_fields(stream,
6595 _access_flags.is_interface(),
6596 _fac,
6597 cp,
6598 cp_size,
6599 &_java_fields_count,
6600 CHECK);
6601
6602 assert(_fields != NULL, "invariant");
6603
6604 // Methods
6605 AccessFlags promoted_flags;
6606 parse_methods(stream,
6607 _access_flags.is_interface(),
6608 &promoted_flags,
6609 &_has_final_method,
6610 &_declares_nonstatic_concrete_methods,
6611 CHECK);
6612
6613 assert(_methods != NULL, "invariant");
6614
6615 // promote flags from parse_methods() to the klass' flags
6616 _access_flags.add_promoted_flags(promoted_flags.as_int());
6617
6618 if (_declares_nonstatic_concrete_methods) {
6619 _has_nonstatic_concrete_methods = true;
6620 }
6621
6622 // Additional attributes/annotations
6623 _parsed_annotations = new ClassAnnotationCollector();
6624 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6625
6626 assert(_inner_classes != NULL, "invariant");
6627
6628 // Finalize the Annotations metadata object,
6629 // now that all annotation arrays have been created.
6630 create_combined_annotations(CHECK);
6631
6632 // Make sure this is the end of class file stream
6633 guarantee_property(stream->at_eos(),
6634 "Extra bytes at the end of class file %s",
6635 CHECK);
6636
6637 // all bytes in stream read and parsed
6638 }
6639
mangle_hidden_class_name(InstanceKlass * const ik)6640 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
6641 ResourceMark rm;
6642 // Construct hidden name from _class_name, "+", and &ik. Note that we can't
6643 // use a '/' because that confuses finding the class's package. Also, can't
6644 // use an illegal char such as ';' because that causes serialization issues
6645 // and issues with hidden classes that create their own hidden classes.
6646 char addr_buf[20];
6647 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
6648 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
6649 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
6650 jio_snprintf(new_name, new_name_len, "%s+%s",
6651 _class_name->as_C_string(), addr_buf);
6652 update_class_name(SymbolTable::new_symbol(new_name));
6653
6654 // Add a Utf8 entry containing the hidden name.
6655 assert(_class_name != NULL, "Unexpected null _class_name");
6656 int hidden_index = _orig_cp_size; // this is an extra slot we added
6657 _cp->symbol_at_put(hidden_index, _class_name);
6658
6659 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
6660 // We have to update the resolved_klass_index and the name_index together
6661 // so extract the existing resolved_klass_index first.
6662 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
6663 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
6664 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
6665 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
6666 "Bad name_index");
6667 }
6668
post_process_parsed_stream(const ClassFileStream * const stream,ConstantPool * cp,TRAPS)6669 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6670 ConstantPool* cp,
6671 TRAPS) {
6672 assert(stream != NULL, "invariant");
6673 assert(stream->at_eos(), "invariant");
6674 assert(cp != NULL, "invariant");
6675 assert(_loader_data != NULL, "invariant");
6676
6677 if (_class_name == vmSymbols::java_lang_Object()) {
6678 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6679 "java.lang.Object cannot implement an interface in class file %s",
6680 CHECK);
6681 }
6682 // We check super class after class file is parsed and format is checked
6683 if (_super_class_index > 0 && NULL ==_super_klass) {
6684 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6685 if (_access_flags.is_interface()) {
6686 // Before attempting to resolve the superclass, check for class format
6687 // errors not checked yet.
6688 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6689 "Interfaces must have java.lang.Object as superclass in class file %s",
6690 CHECK);
6691 }
6692 Handle loader(THREAD, _loader_data->class_loader());
6693 _super_klass = (const InstanceKlass*)
6694 SystemDictionary::resolve_super_or_fail(_class_name,
6695 super_class_name,
6696 loader,
6697 _protection_domain,
6698 true,
6699 CHECK);
6700 }
6701
6702 if (_super_klass != NULL) {
6703 if (_super_klass->has_nonstatic_concrete_methods()) {
6704 _has_nonstatic_concrete_methods = true;
6705 }
6706
6707 if (_super_klass->is_interface()) {
6708 ResourceMark rm(THREAD);
6709 Exceptions::fthrow(
6710 THREAD_AND_LOCATION,
6711 vmSymbols::java_lang_IncompatibleClassChangeError(),
6712 "class %s has interface %s as super class",
6713 _class_name->as_klass_external_name(),
6714 _super_klass->external_name()
6715 );
6716 return;
6717 }
6718 }
6719
6720 // Compute the transitive list of all unique interfaces implemented by this class
6721 _transitive_interfaces =
6722 compute_transitive_interfaces(_super_klass,
6723 _local_interfaces,
6724 _loader_data,
6725 CHECK);
6726
6727 assert(_transitive_interfaces != NULL, "invariant");
6728
6729 // sort methods
6730 _method_ordering = sort_methods(_methods);
6731
6732 _all_mirandas = new GrowableArray<Method*>(20);
6733
6734 Handle loader(THREAD, _loader_data->class_loader());
6735 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6736 &_num_miranda_methods,
6737 _all_mirandas,
6738 _super_klass,
6739 _methods,
6740 _access_flags,
6741 _major_version,
6742 loader,
6743 _class_name,
6744 _local_interfaces,
6745 CHECK);
6746
6747 // Size of Java itable (in words)
6748 _itable_size = _access_flags.is_interface() ? 0 :
6749 klassItable::compute_itable_size(_transitive_interfaces);
6750
6751 assert(_fac != NULL, "invariant");
6752 assert(_parsed_annotations != NULL, "invariant");
6753
6754 _field_info = new FieldLayoutInfo();
6755 if (UseNewFieldLayout) {
6756 FieldLayoutBuilder lb(class_name(), super_klass(), _cp, _fields,
6757 _parsed_annotations->is_contended(), _field_info);
6758 lb.build_layout();
6759 } else {
6760 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6761 }
6762
6763 // Compute reference typ
6764 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6765
6766 }
6767
set_klass(InstanceKlass * klass)6768 void ClassFileParser::set_klass(InstanceKlass* klass) {
6769
6770 #ifdef ASSERT
6771 if (klass != NULL) {
6772 assert(NULL == _klass, "leaking?");
6773 }
6774 #endif
6775
6776 _klass = klass;
6777 }
6778
set_klass_to_deallocate(InstanceKlass * klass)6779 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6780
6781 #ifdef ASSERT
6782 if (klass != NULL) {
6783 assert(NULL == _klass_to_deallocate, "leaking?");
6784 }
6785 #endif
6786
6787 _klass_to_deallocate = klass;
6788 }
6789
6790 // Caller responsible for ResourceMark
6791 // clone stream with rewound position
clone_stream() const6792 const ClassFileStream* ClassFileParser::clone_stream() const {
6793 assert(_stream != NULL, "invariant");
6794
6795 return _stream->clone();
6796 }
6797 // ----------------------------------------------------------------------------
6798 // debugging
6799
6800 #ifdef ASSERT
6801
6802 // return true if class_name contains no '.' (internal format is '/')
is_internal_format(Symbol * class_name)6803 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6804 if (class_name != NULL) {
6805 ResourceMark rm;
6806 char* name = class_name->as_C_string();
6807 return strchr(name, JVM_SIGNATURE_DOT) == NULL;
6808 } else {
6809 return true;
6810 }
6811 }
6812
6813 #endif
6814