1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24 #include "precompiled.hpp"
25 #include "jvm.h"
26 #include "aot/aotLoader.hpp"
27 #include "classfile/classFileParser.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/defaultMethods.hpp"
32 #include "classfile/dictionary.hpp"
33 #include "classfile/javaClasses.inline.hpp"
34 #include "classfile/moduleEntry.hpp"
35 #include "classfile/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/verificationType.hpp"
38 #include "classfile/verifier.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/allocation.hpp"
43 #include "memory/metadataFactory.hpp"
44 #include "memory/oopFactory.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "memory/universe.hpp"
47 #include "oops/annotations.hpp"
48 #include "oops/constantPool.inline.hpp"
49 #include "oops/fieldStreams.hpp"
50 #include "oops/instanceKlass.hpp"
51 #include "oops/instanceMirrorKlass.hpp"
52 #include "oops/klass.inline.hpp"
53 #include "oops/klassVtable.hpp"
54 #include "oops/metadata.hpp"
55 #include "oops/method.hpp"
56 #include "oops/oop.inline.hpp"
57 #include "oops/symbol.hpp"
58 #include "oops/valueKlass.hpp"
59 #include "prims/jvmtiExport.hpp"
60 #include "prims/jvmtiThreadState.hpp"
61 #include "runtime/arguments.hpp"
62 #include "runtime/handles.inline.hpp"
63 #include "runtime/javaCalls.hpp"
64 #include "runtime/perfData.hpp"
65 #include "runtime/reflection.hpp"
66 #include "runtime/safepointVerifiers.hpp"
67 #include "runtime/signature.hpp"
68 #include "runtime/timer.hpp"
69 #include "services/classLoadingService.hpp"
70 #include "services/threadService.hpp"
71 #include "utilities/align.hpp"
72 #include "utilities/bitMap.inline.hpp"
73 #include "utilities/copy.hpp"
74 #include "utilities/exceptions.hpp"
75 #include "utilities/globalDefinitions.hpp"
76 #include "utilities/growableArray.hpp"
77 #include "utilities/macros.hpp"
78 #include "utilities/ostream.hpp"
79 #include "utilities/resourceHash.hpp"
80 #if INCLUDE_CDS
81 #include "classfile/systemDictionaryShared.hpp"
82 #endif
83 #if INCLUDE_JFR
84 #include "jfr/support/jfrTraceIdExtension.hpp"
85 #endif
86
87 // We generally try to create the oops directly when parsing, rather than
88 // allocating temporary data structures and copying the bytes twice. A
89 // temporary area is only needed when parsing utf8 entries in the constant
90 // pool and when parsing line number tables.
91
92 // We add assert in debug mode when class format is not checked.
93
94 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
95 #define JAVA_MIN_SUPPORTED_VERSION 45
96 #define JAVA_PREVIEW_MINOR_VERSION 65535
97
98 // Used for two backward compatibility reasons:
99 // - to check for new additions to the class file format in JDK1.5
100 // - to check for bug fixes in the format checker in JDK1.5
101 #define JAVA_1_5_VERSION 49
102
103 // Used for backward compatibility reasons:
104 // - to check for javac bug fixes that happened after 1.5
105 // - also used as the max version when running in jdk6
106 #define JAVA_6_VERSION 50
107
108 // Used for backward compatibility reasons:
109 // - to disallow argument and require ACC_STATIC for <clinit> methods
110 #define JAVA_7_VERSION 51
111
112 // Extension method support.
113 #define JAVA_8_VERSION 52
114
115 #define JAVA_9_VERSION 53
116
117 #define JAVA_10_VERSION 54
118
119 #define JAVA_11_VERSION 55
120
121 #define JAVA_12_VERSION 56
122
123 #define CONSTANT_CLASS_DESCRIPTORS 56
124
125 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
126 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION,
127 "Unexpected bad constant pool entry");
128 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
129 }
130
131 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
132 ConstantPool* cp,
133 const int length,
134 TRAPS) {
135 assert(stream != NULL, "invariant");
136 assert(cp != NULL, "invariant");
137
138 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
139 // this function (_current can be allocated in a register, with scalar
140 // replacement of aggregates). The _current pointer is copied back to
141 // stream() when this function returns. DON'T call another method within
142 // this method that uses stream().
143 const ClassFileStream cfs1 = *stream;
144 const ClassFileStream* const cfs = &cfs1;
145
146 assert(cfs->allocated_on_stack(), "should be local");
147 debug_only(const u1* const old_current = stream->current();)
148
149 // Used for batching symbol allocations.
150 const char* names[SymbolTable::symbol_alloc_batch_size];
151 int lengths[SymbolTable::symbol_alloc_batch_size];
152 int indices[SymbolTable::symbol_alloc_batch_size];
153 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
154 int names_count = 0;
155
156 // parsing Index 0 is unused
157 for (int index = 1; index < length; index++) {
158 // Each of the following case guarantees one more byte in the stream
159 // for the following tag or the access_flags following constant pool,
160 // so we don't need bounds-check for reading tag.
161 const u1 tag = cfs->get_u1_fast();
162 switch (tag) {
163 case JVM_CONSTANT_Class: {
164 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
165 const u2 name_index = cfs->get_u2_fast();
166 cp->klass_index_at_put(index, name_index);
167 break;
168 }
169 case JVM_CONSTANT_Fieldref: {
170 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
171 const u2 class_index = cfs->get_u2_fast();
172 const u2 name_and_type_index = cfs->get_u2_fast();
173 cp->field_at_put(index, class_index, name_and_type_index);
174 break;
175 }
176 case JVM_CONSTANT_Methodref: {
177 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
178 const u2 class_index = cfs->get_u2_fast();
179 const u2 name_and_type_index = cfs->get_u2_fast();
180 cp->method_at_put(index, class_index, name_and_type_index);
181 break;
182 }
183 case JVM_CONSTANT_InterfaceMethodref: {
184 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
185 const u2 class_index = cfs->get_u2_fast();
186 const u2 name_and_type_index = cfs->get_u2_fast();
187 cp->interface_method_at_put(index, class_index, name_and_type_index);
188 break;
189 }
190 case JVM_CONSTANT_String : {
191 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
192 const u2 string_index = cfs->get_u2_fast();
193 cp->string_index_at_put(index, string_index);
194 break;
195 }
196 case JVM_CONSTANT_MethodHandle :
197 case JVM_CONSTANT_MethodType: {
198 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
199 classfile_parse_error(
200 "Class file version does not support constant tag %u in class file %s",
201 tag, CHECK);
202 }
203 if (tag == JVM_CONSTANT_MethodHandle) {
204 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
205 const u1 ref_kind = cfs->get_u1_fast();
206 const u2 method_index = cfs->get_u2_fast();
207 cp->method_handle_index_at_put(index, ref_kind, method_index);
208 }
209 else if (tag == JVM_CONSTANT_MethodType) {
210 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
211 const u2 signature_index = cfs->get_u2_fast();
212 cp->method_type_index_at_put(index, signature_index);
213 }
214 else {
215 ShouldNotReachHere();
216 }
217 break;
218 }
219 case JVM_CONSTANT_Dynamic : {
220 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
221 classfile_parse_error(
222 "Class file version does not support constant tag %u in class file %s",
223 tag, CHECK);
224 }
225 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
226 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
227 const u2 name_and_type_index = cfs->get_u2_fast();
228 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
229 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
230 }
231 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
232 break;
233 }
234 case JVM_CONSTANT_InvokeDynamic : {
235 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
236 classfile_parse_error(
237 "Class file version does not support constant tag %u in class file %s",
238 tag, CHECK);
239 }
240 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
241 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
242 const u2 name_and_type_index = cfs->get_u2_fast();
243 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
244 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
245 }
246 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
247 break;
248 }
249 case JVM_CONSTANT_Integer: {
250 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
251 const u4 bytes = cfs->get_u4_fast();
252 cp->int_at_put(index, (jint)bytes);
253 break;
254 }
255 case JVM_CONSTANT_Float: {
256 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
257 const u4 bytes = cfs->get_u4_fast();
258 cp->float_at_put(index, *(jfloat*)&bytes);
259 break;
260 }
261 case JVM_CONSTANT_Long: {
262 // A mangled type might cause you to overrun allocated memory
263 guarantee_property(index + 1 < length,
264 "Invalid constant pool entry %u in class file %s",
265 index,
266 CHECK);
267 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
268 const u8 bytes = cfs->get_u8_fast();
269 cp->long_at_put(index, bytes);
270 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
271 break;
272 }
273 case JVM_CONSTANT_Double: {
274 // A mangled type might cause you to overrun allocated memory
275 guarantee_property(index+1 < length,
276 "Invalid constant pool entry %u in class file %s",
277 index,
278 CHECK);
279 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
280 const u8 bytes = cfs->get_u8_fast();
281 cp->double_at_put(index, *(jdouble*)&bytes);
282 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
283 break;
284 }
285 case JVM_CONSTANT_NameAndType: {
286 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
287 const u2 name_index = cfs->get_u2_fast();
288 const u2 signature_index = cfs->get_u2_fast();
289 cp->name_and_type_at_put(index, name_index, signature_index);
290 break;
291 }
292 case JVM_CONSTANT_Utf8 : {
293 cfs->guarantee_more(2, CHECK); // utf8_length
294 u2 utf8_length = cfs->get_u2_fast();
295 const u1* utf8_buffer = cfs->current();
296 assert(utf8_buffer != NULL, "null utf8 buffer");
297 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
298 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
299 cfs->skip_u1_fast(utf8_length);
300
301 // Before storing the symbol, make sure it's legal
302 if (_need_verify) {
303 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
304 }
305
306 if (has_cp_patch_at(index)) {
307 Handle patch = clear_cp_patch_at(index);
308 guarantee_property(java_lang_String::is_instance(patch()),
309 "Illegal utf8 patch at %d in class file %s",
310 index,
311 CHECK);
312 const char* const str = java_lang_String::as_utf8_string(patch());
313 // (could use java_lang_String::as_symbol instead, but might as well batch them)
314 utf8_buffer = (const u1*) str;
315 utf8_length = (int) strlen(str);
316 }
317
318 unsigned int hash;
319 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
320 utf8_length,
321 hash);
322 if (result == NULL) {
323 names[names_count] = (const char*)utf8_buffer;
324 lengths[names_count] = utf8_length;
325 indices[names_count] = index;
326 hashValues[names_count++] = hash;
327 if (names_count == SymbolTable::symbol_alloc_batch_size) {
328 SymbolTable::new_symbols(_loader_data,
329 cp,
330 names_count,
331 names,
332 lengths,
333 indices,
334 hashValues,
335 CHECK);
336 names_count = 0;
337 }
338 } else {
339 cp->symbol_at_put(index, result);
340 }
341 break;
342 }
343 case 19:
344 case 20: {
345 // Record that an error occurred in these two cases but keep parsing so
346 // that ACC_Module can be checked for in the access_flags. Need to
347 // throw NoClassDefFoundError in that case.
348 if (_major_version >= JAVA_9_VERSION) {
349 cfs->guarantee_more(3, CHECK);
350 cfs->get_u2_fast();
351 set_class_bad_constant_seen(tag);
352 break;
353 }
354 }
355 default: {
356 classfile_parse_error("Unknown constant tag %u in class file %s",
357 tag,
358 CHECK);
359 break;
360 }
361 } // end of switch(tag)
362 } // end of for
363
364 // Allocate the remaining symbols
365 if (names_count > 0) {
366 SymbolTable::new_symbols(_loader_data,
367 cp,
368 names_count,
369 names,
370 lengths,
371 indices,
372 hashValues,
373 CHECK);
374 }
375
376 // Copy _current pointer of local copy back to stream.
377 assert(stream->current() == old_current, "non-exclusive use of stream");
378 stream->set_current(cfs1.current());
379
380 }
381
382 static inline bool valid_cp_range(int index, int length) {
383 return (index > 0 && index < length);
384 }
385
386 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
387 assert(cp != NULL, "invariant");
388 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
389 return cp->symbol_at(index);
390 }
391 return NULL;
392 }
393
394 #ifdef ASSERT
395 PRAGMA_DIAG_PUSH
396 PRAGMA_FORMAT_NONLITERAL_IGNORED
397 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
398 ResourceMark rm(THREAD);
399 fatal(msg, _class_name->as_C_string());
400 }
401
402 void ClassFileParser::report_assert_property_failure(const char* msg,
403 int index,
404 TRAPS) const {
405 ResourceMark rm(THREAD);
406 fatal(msg, index, _class_name->as_C_string());
407 }
408 PRAGMA_DIAG_POP
409 #endif
410
411 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
412 ConstantPool* const cp,
413 const int length,
414 TRAPS) {
415 assert(cp != NULL, "invariant");
416 assert(stream != NULL, "invariant");
417
418 // parsing constant pool entries
419 parse_constant_pool_entries(stream, cp, length, CHECK);
420 if (class_bad_constant_seen() != 0) {
421 // a bad CP entry has been detected previously so stop parsing and just return.
422 return;
423 }
424
425 int index = 1; // declared outside of loops for portability
426 int num_klasses = 0;
427
428 // first verification pass - validate cross references
429 // and fixup class and string constants
430 for (index = 1; index < length; index++) { // Index 0 is unused
431 const jbyte tag = cp->tag_at(index).value();
432 switch (tag) {
433 case JVM_CONSTANT_Class: {
434 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
435 break;
436 }
437 case JVM_CONSTANT_Fieldref:
438 // fall through
439 case JVM_CONSTANT_Methodref:
440 // fall through
441 case JVM_CONSTANT_InterfaceMethodref: {
442 if (!_need_verify) break;
443 const int klass_ref_index = cp->klass_ref_index_at(index);
444 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
445 check_property(valid_klass_reference_at(klass_ref_index),
446 "Invalid constant pool index %u in class file %s",
447 klass_ref_index, CHECK);
448 check_property(valid_cp_range(name_and_type_ref_index, length) &&
449 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
450 "Invalid constant pool index %u in class file %s",
451 name_and_type_ref_index, CHECK);
452 break;
453 }
454 case JVM_CONSTANT_String: {
455 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
456 break;
457 }
458 case JVM_CONSTANT_Integer:
459 break;
460 case JVM_CONSTANT_Float:
461 break;
462 case JVM_CONSTANT_Long:
463 case JVM_CONSTANT_Double: {
464 index++;
465 check_property(
466 (index < length && cp->tag_at(index).is_invalid()),
467 "Improper constant pool long/double index %u in class file %s",
468 index, CHECK);
469 break;
470 }
471 case JVM_CONSTANT_NameAndType: {
472 if (!_need_verify) break;
473 const int name_ref_index = cp->name_ref_index_at(index);
474 const int signature_ref_index = cp->signature_ref_index_at(index);
475 check_property(valid_symbol_at(name_ref_index),
476 "Invalid constant pool index %u in class file %s",
477 name_ref_index, CHECK);
478 check_property(valid_symbol_at(signature_ref_index),
479 "Invalid constant pool index %u in class file %s",
480 signature_ref_index, CHECK);
481 break;
482 }
483 case JVM_CONSTANT_Utf8:
484 break;
485 case JVM_CONSTANT_UnresolvedClass: // fall-through
486 case JVM_CONSTANT_UnresolvedClassInError: {
487 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
488 break;
489 }
490 case JVM_CONSTANT_ClassIndex: {
491 const int class_index = cp->klass_index_at(index);
492 check_property(valid_symbol_at(class_index),
493 "Invalid constant pool index %u in class file %s",
494 class_index, CHECK);
495
496 Symbol* const name = cp->symbol_at(class_index);
497 const unsigned int name_len = name->utf8_length();
498 if (name->is_Q_signature()) {
499 cp->unresolved_qdescriptor_at_put(index, class_index, num_klasses++);
500 } else {
501 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
502 }
503 break;
504 }
505 case JVM_CONSTANT_StringIndex: {
506 const int string_index = cp->string_index_at(index);
507 check_property(valid_symbol_at(string_index),
508 "Invalid constant pool index %u in class file %s",
509 string_index, CHECK);
510 Symbol* const sym = cp->symbol_at(string_index);
511 cp->unresolved_string_at_put(index, sym);
512 break;
513 }
514 case JVM_CONSTANT_MethodHandle: {
515 const int ref_index = cp->method_handle_index_at(index);
516 check_property(valid_cp_range(ref_index, length),
517 "Invalid constant pool index %u in class file %s",
518 ref_index, CHECK);
519 const constantTag tag = cp->tag_at(ref_index);
520 const int ref_kind = cp->method_handle_ref_kind_at(index);
521
522 switch (ref_kind) {
523 case JVM_REF_getField:
524 case JVM_REF_getStatic:
525 case JVM_REF_putField:
526 case JVM_REF_putStatic: {
527 check_property(
528 tag.is_field(),
529 "Invalid constant pool index %u in class file %s (not a field)",
530 ref_index, CHECK);
531 break;
532 }
533 case JVM_REF_invokeVirtual:
534 case JVM_REF_newInvokeSpecial: {
535 check_property(
536 tag.is_method(),
537 "Invalid constant pool index %u in class file %s (not a method)",
538 ref_index, CHECK);
539 break;
540 }
541 case JVM_REF_invokeStatic:
542 case JVM_REF_invokeSpecial: {
543 check_property(
544 tag.is_method() ||
545 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
546 "Invalid constant pool index %u in class file %s (not a method)",
547 ref_index, CHECK);
548 break;
549 }
550 case JVM_REF_invokeInterface: {
551 check_property(
552 tag.is_interface_method(),
553 "Invalid constant pool index %u in class file %s (not an interface method)",
554 ref_index, CHECK);
555 break;
556 }
557 default: {
558 classfile_parse_error(
559 "Bad method handle kind at constant pool index %u in class file %s",
560 index, CHECK);
561 }
562 } // switch(refkind)
563 // Keep the ref_index unchanged. It will be indirected at link-time.
564 break;
565 } // case MethodHandle
566 case JVM_CONSTANT_MethodType: {
567 const int ref_index = cp->method_type_index_at(index);
568 check_property(valid_symbol_at(ref_index),
569 "Invalid constant pool index %u in class file %s",
570 ref_index, CHECK);
571 break;
572 }
573 case JVM_CONSTANT_Dynamic: {
574 const int name_and_type_ref_index =
575 cp->invoke_dynamic_name_and_type_ref_index_at(index);
576
577 check_property(valid_cp_range(name_and_type_ref_index, length) &&
578 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
579 "Invalid constant pool index %u in class file %s",
580 name_and_type_ref_index, CHECK);
581 // bootstrap specifier index must be checked later,
582 // when BootstrapMethods attr is available
583
584 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
585 cp->set_has_dynamic_constant();
586 break;
587 }
588 case JVM_CONSTANT_InvokeDynamic: {
589 const int name_and_type_ref_index =
590 cp->invoke_dynamic_name_and_type_ref_index_at(index);
591
592 check_property(valid_cp_range(name_and_type_ref_index, length) &&
593 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
594 "Invalid constant pool index %u in class file %s",
595 name_and_type_ref_index, CHECK);
596 // bootstrap specifier index must be checked later,
597 // when BootstrapMethods attr is available
598 break;
599 }
600 default: {
601 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
602 ShouldNotReachHere();
603 break;
604 }
605 } // switch(tag)
606 } // end of for
607
608 _first_patched_klass_resolved_index = num_klasses;
609 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
610
611 if (_cp_patches != NULL) {
612 // need to treat this_class specially...
613
614 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
615 // for now. These will be replaced with actual names of the patched classes in patch_class().
616 Symbol* s = vmSymbols::star_name();
617 for (int n=_orig_cp_size; n<cp->length(); n++) {
618 cp->symbol_at_put(n, s);
619 }
620
621 int this_class_index;
622 {
623 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
624 const u1* const mark = stream->current();
625 stream->skip_u2_fast(1); // skip flags
626 this_class_index = stream->get_u2_fast();
627 stream->set_current(mark); // revert to mark
628 }
629
630 for (index = 1; index < length; index++) { // Index 0 is unused
631 if (has_cp_patch_at(index)) {
632 guarantee_property(index != this_class_index,
633 "Illegal constant pool patch to self at %d in class file %s",
634 index, CHECK);
635 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
636 }
637 }
638 }
639
640 if (!_need_verify) {
641 return;
642 }
643
644 // second verification pass - checks the strings are of the right format.
645 // but not yet to the other entries
646 for (index = 1; index < length; index++) {
647 const jbyte tag = cp->tag_at(index).value();
648 switch (tag) {
649 case JVM_CONSTANT_UnresolvedClass: {
650 const Symbol* const class_name = cp->klass_name_at(index);
651 // check the name, even if _cp_patches will overwrite it
652 verify_legal_class_name(class_name, CHECK);
653 break;
654 }
655 case JVM_CONSTANT_NameAndType: {
656 if (_need_verify) {
657 const int sig_index = cp->signature_ref_index_at(index);
658 const int name_index = cp->name_ref_index_at(index);
659 const Symbol* const name = cp->symbol_at(name_index);
660 const Symbol* const sig = cp->symbol_at(sig_index);
661 guarantee_property(sig->utf8_length() != 0,
662 "Illegal zero length constant pool entry at %d in class %s",
663 sig_index, CHECK);
664 guarantee_property(name->utf8_length() != 0,
665 "Illegal zero length constant pool entry at %d in class %s",
666 name_index, CHECK);
667
668 if (sig->char_at(0) == JVM_SIGNATURE_FUNC) {
669 // Format check method name and signature
670 verify_legal_method_name(name, CHECK);
671 verify_legal_method_signature(name, sig, CHECK);
672 } else {
673 // Format check field name and signature
674 verify_legal_field_name(name, CHECK);
675 verify_legal_field_signature(name, sig, CHECK);
676 }
677 }
678 break;
679 }
680 case JVM_CONSTANT_Dynamic: {
681 const int name_and_type_ref_index =
682 cp->name_and_type_ref_index_at(index);
683 // already verified to be utf8
684 const int name_ref_index =
685 cp->name_ref_index_at(name_and_type_ref_index);
686 // already verified to be utf8
687 const int signature_ref_index =
688 cp->signature_ref_index_at(name_and_type_ref_index);
689 const Symbol* const name = cp->symbol_at(name_ref_index);
690 const Symbol* const signature = cp->symbol_at(signature_ref_index);
691 if (_need_verify) {
692 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
693 // Need only to be sure signature is non-zero length and the right type.
694 if (signature->utf8_length() == 0 ||
695 signature->char_at(0) == JVM_SIGNATURE_FUNC) {
696 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
697 }
698 }
699 break;
700 }
701 case JVM_CONSTANT_InvokeDynamic:
702 case JVM_CONSTANT_Fieldref:
703 case JVM_CONSTANT_Methodref:
704 case JVM_CONSTANT_InterfaceMethodref: {
705 const int name_and_type_ref_index =
706 cp->name_and_type_ref_index_at(index);
707 // already verified to be utf8
708 const int name_ref_index =
709 cp->name_ref_index_at(name_and_type_ref_index);
710 // already verified to be utf8
711 const int signature_ref_index =
712 cp->signature_ref_index_at(name_and_type_ref_index);
713 const Symbol* const name = cp->symbol_at(name_ref_index);
714 const Symbol* const signature = cp->symbol_at(signature_ref_index);
715 if (tag == JVM_CONSTANT_Fieldref) {
716 if (_need_verify) {
717 // Field name and signature are verified above, when iterating NameAndType_info.
718 // Need only to be sure signature is non-zero length and the right type.
719 if (signature->utf8_length() == 0 ||
720 signature->char_at(0) == JVM_SIGNATURE_FUNC) {
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->utf8_length() == 0 ||
729 signature->char_at(0) != JVM_SIGNATURE_FUNC) {
730 throwIllegalSignature("Method", name, signature, CHECK);
731 }
732 }
733 // 4509014: If a class method name begins with '<', it must be "<init>"
734 const unsigned int name_len = name->utf8_length();
735 if (tag == JVM_CONSTANT_Methodref &&
736 name_len != 0 &&
737 name->char_at(0) == '<' &&
738 name != vmSymbols::object_initializer_name()) {
739 classfile_parse_error(
740 "Bad method name at constant pool index %u in class file %s",
741 name_ref_index, CHECK);
742 }
743 }
744 break;
745 }
746 case JVM_CONSTANT_MethodHandle: {
747 const int ref_index = cp->method_handle_index_at(index);
748 const int ref_kind = cp->method_handle_ref_kind_at(index);
749 switch (ref_kind) {
750 case JVM_REF_invokeVirtual:
751 case JVM_REF_invokeStatic:
752 case JVM_REF_invokeSpecial:
753 case JVM_REF_newInvokeSpecial: {
754 const int name_and_type_ref_index =
755 cp->name_and_type_ref_index_at(ref_index);
756 const int name_ref_index =
757 cp->name_ref_index_at(name_and_type_ref_index);
758 const Symbol* const name = cp->symbol_at(name_ref_index);
759 if (ref_kind == JVM_REF_newInvokeSpecial) {
760 if (name != vmSymbols::object_initializer_name()) {
761 classfile_parse_error(
762 "Bad constructor name at constant pool index %u in class file %s",
763 name_ref_index, CHECK);
764 }
765 } else {
766 if (name == vmSymbols::object_initializer_name()) {
767 classfile_parse_error(
768 "Bad method name at constant pool index %u in class file %s",
769 name_ref_index, CHECK);
770 }
771 }
772 break;
773 }
774 // Other ref_kinds are already fully checked in previous pass.
775 } // switch(ref_kind)
776 break;
777 }
778 case JVM_CONSTANT_MethodType: {
779 const Symbol* const no_name = vmSymbols::type_name(); // place holder
780 const Symbol* const signature = cp->method_type_signature_at(index);
781 verify_legal_method_signature(no_name, signature, CHECK);
782 break;
783 }
784 case JVM_CONSTANT_Utf8: {
785 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
786 }
787 } // switch(tag)
788 } // end of for
789 }
790
791 Handle ClassFileParser::clear_cp_patch_at(int index) {
792 Handle patch = cp_patch_at(index);
793 _cp_patches->at_put(index, Handle());
794 assert(!has_cp_patch_at(index), "");
795 return patch;
796 }
797
798 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
799 int name_index = _orig_cp_size + _num_patched_klasses;
800 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
801
802 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
803 _num_patched_klasses ++;
804 }
805
806 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
807 int index,
808 Handle patch,
809 TRAPS) {
810 assert(cp != NULL, "invariant");
811
812 BasicType patch_type = T_VOID;
813
814 switch (cp->tag_at(index).value()) {
815
816 case JVM_CONSTANT_UnresolvedClass: {
817 // Patching a class means pre-resolving it.
818 // The name in the constant pool is ignored.
819 if (java_lang_Class::is_instance(patch())) {
820 guarantee_property(!java_lang_Class::is_primitive(patch()),
821 "Illegal class patch at %d in class file %s",
822 index, CHECK);
823 Klass* k = java_lang_Class::as_Klass(patch());
824 patch_class(cp, index, k, k->name());
825 } else {
826 guarantee_property(java_lang_String::is_instance(patch()),
827 "Illegal class patch at %d in class file %s",
828 index, CHECK);
829 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK);
830 patch_class(cp, index, NULL, name);
831 }
832 break;
833 }
834
835 case JVM_CONSTANT_String: {
836 // skip this patch and don't clear it. Needs the oop array for resolved
837 // references to be created first.
838 return;
839 }
840 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
841 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
842 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
843 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
844 patch_prim:
845 {
846 jvalue value;
847 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
848 guarantee_property(value_type == patch_type,
849 "Illegal primitive patch at %d in class file %s",
850 index, CHECK);
851 switch (value_type) {
852 case T_INT: cp->int_at_put(index, value.i); break;
853 case T_FLOAT: cp->float_at_put(index, value.f); break;
854 case T_LONG: cp->long_at_put(index, value.j); break;
855 case T_DOUBLE: cp->double_at_put(index, value.d); break;
856 default: assert(false, "");
857 }
858 } // end patch_prim label
859 break;
860
861 default: {
862 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
863 guarantee_property(!has_cp_patch_at(index),
864 "Illegal unexpected patch at %d in class file %s",
865 index, CHECK);
866 return;
867 }
868 } // end of switch(tag)
869
870 // On fall-through, mark the patch as used.
871 clear_cp_patch_at(index);
872 }
873 class NameSigHash: public ResourceObj {
874 public:
875 const Symbol* _name; // name
876 const Symbol* _sig; // signature
877 NameSigHash* _next; // Next entry in hash table
878 };
879
880 static const int HASH_ROW_SIZE = 256;
881
882 static unsigned int hash(const Symbol* name, const Symbol* sig) {
883 unsigned int raw_hash = 0;
884 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
885 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
886
887 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
888 }
889
890
891 static void initialize_hashtable(NameSigHash** table) {
892 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
893 }
894 // Return false if the name/sig combination is found in table.
895 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
896 // The old format checker uses heap sort to find duplicates.
897 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
898 // of table since we don't expect Symbol*'s to move.
899 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
900 assert(name != NULL, "name in constant pool is NULL");
901
902 // First lookup for duplicates
903 int index = hash(name, sig);
904 NameSigHash* entry = table[index];
905 while (entry != NULL) {
906 if (entry->_name == name && entry->_sig == sig) {
907 return false;
908 }
909 entry = entry->_next;
910 }
911
912 // No duplicate is found, allocate a new entry and fill it.
913 entry = new NameSigHash();
914 entry->_name = name;
915 entry->_sig = sig;
916
917 // Insert into hash table
918 entry->_next = table[index];
919 table[index] = entry;
920
921 return true;
922 }
923
924 // Side-effects: populates the _local_interfaces field
925 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
926 const int itfs_len,
927 ConstantPool* const cp,
928 bool* const has_nonstatic_concrete_methods,
929 TRAPS) {
930 assert(stream != NULL, "invariant");
931 assert(cp != NULL, "invariant");
932 assert(has_nonstatic_concrete_methods != NULL, "invariant");
933
934 if (itfs_len == 0) {
935 _local_interfaces = Universe::the_empty_instance_klass_array();
936 } else {
937 assert(itfs_len > 0, "only called for len>0");
938 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
939
940 int index;
941 for (index = 0; index < itfs_len; index++) {
942 const u2 interface_index = stream->get_u2(CHECK);
943 Klass* interf;
944 check_property(
945 valid_klass_reference_at(interface_index),
946 "Interface name has bad constant pool index %u in class file %s",
947 interface_index, CHECK);
948 if (cp->tag_at(interface_index).is_klass()) {
949 interf = cp->resolved_klass_at(interface_index);
950 } else {
951 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
952
953 // Don't need to check legal name because it's checked when parsing constant pool.
954 // But need to make sure it's not an array type.
955 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
956 "Bad interface name in class file %s", CHECK);
957
958 // Call resolve_super so classcircularity is checked
959 interf = SystemDictionary::resolve_super_or_fail(
960 _class_name,
961 unresolved_klass,
962 Handle(THREAD, _loader_data->class_loader()),
963 _protection_domain,
964 false,
965 CHECK);
966 }
967
968 if (!interf->is_interface()) {
969 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
970 err_msg("class %s can not implement %s, because it is not an interface (%s)",
971 _class_name->as_klass_external_name(),
972 interf->external_name(),
973 interf->class_in_module_of_loader()));
974 }
975
976 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
977 *has_nonstatic_concrete_methods = true;
978 }
979 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
980 }
981
982 if (!_need_verify || itfs_len <= 1) {
983 return;
984 }
985
986 // Check if there's any duplicates in interfaces
987 ResourceMark rm(THREAD);
988 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
989 NameSigHash*,
990 HASH_ROW_SIZE);
991 initialize_hashtable(interface_names);
992 bool dup = false;
993 const Symbol* name = NULL;
994 {
995 debug_only(NoSafepointVerifier nsv;)
996 for (index = 0; index < itfs_len; index++) {
997 const InstanceKlass* const k = _local_interfaces->at(index);
998 name = k->name();
999 // If no duplicates, add (name, NULL) in hashtable interface_names.
1000 if (!put_after_lookup(name, NULL, interface_names)) {
1001 dup = true;
1002 break;
1003 }
1004 }
1005 }
1006 if (dup) {
1007 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
1008 name->as_C_string(), CHECK);
1009 }
1010 }
1011 }
1012
1013 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
1014 int constantvalue_index,
1015 int signature_index,
1016 TRAPS) const {
1017 // Make sure the constant pool entry is of a type appropriate to this field
1018 guarantee_property(
1019 (constantvalue_index > 0 &&
1020 constantvalue_index < cp->length()),
1021 "Bad initial value index %u in ConstantValue attribute in class file %s",
1022 constantvalue_index, CHECK);
1023
1024 const constantTag value_type = cp->tag_at(constantvalue_index);
1025 switch(cp->basic_type_for_signature_at(signature_index)) {
1026 case T_LONG: {
1027 guarantee_property(value_type.is_long(),
1028 "Inconsistent constant value type in class file %s",
1029 CHECK);
1030 break;
1031 }
1032 case T_FLOAT: {
1033 guarantee_property(value_type.is_float(),
1034 "Inconsistent constant value type in class file %s",
1035 CHECK);
1036 break;
1037 }
1038 case T_DOUBLE: {
1039 guarantee_property(value_type.is_double(),
1040 "Inconsistent constant value type in class file %s",
1041 CHECK);
1042 break;
1043 }
1044 case T_BYTE:
1045 case T_CHAR:
1046 case T_SHORT:
1047 case T_BOOLEAN:
1048 case T_INT: {
1049 guarantee_property(value_type.is_int(),
1050 "Inconsistent constant value type in class file %s",
1051 CHECK);
1052 break;
1053 }
1054 case T_OBJECT: {
1055 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1056 && value_type.is_string()),
1057 "Bad string initial value in class file %s",
1058 CHECK);
1059 break;
1060 }
1061 default: {
1062 classfile_parse_error("Unable to set initial value %u in class file %s",
1063 constantvalue_index,
1064 CHECK);
1065 }
1066 }
1067 }
1068
1069 class AnnotationCollector : public ResourceObj{
1070 public:
1071 enum Location { _in_field, _in_method, _in_class };
1072 enum ID {
1073 _unknown = 0,
1074 _method_CallerSensitive,
1075 _method_ForceInline,
1076 _method_DontInline,
1077 _method_InjectedProfile,
1078 _method_LambdaForm_Compiled,
1079 _method_Hidden,
1080 _method_HotSpotIntrinsicCandidate,
1081 _jdk_internal_vm_annotation_Contended,
1082 _field_Stable,
1083 _jdk_internal_vm_annotation_ReservedStackAccess,
1084 _annotation_LIMIT
1085 };
1086 const Location _location;
1087 int _annotations_present;
1088 u2 _contended_group;
1089
1090 AnnotationCollector(Location location)
1091 : _location(location), _annotations_present(0)
1092 {
1093 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1094 }
1095 // If this annotation name has an ID, report it (or _none).
1096 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1097 // Set the annotation name:
1098 void set_annotation(ID id) {
1099 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1100 _annotations_present |= nth_bit((int)id);
1101 }
1102
1103 void remove_annotation(ID id) {
1104 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1105 _annotations_present &= ~nth_bit((int)id);
1106 }
1107
1108 // Report if the annotation is present.
1109 bool has_any_annotations() const { return _annotations_present != 0; }
1110 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1111
1112 void set_contended_group(u2 group) { _contended_group = group; }
1113 u2 contended_group() const { return _contended_group; }
1114
1115 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1116
1117 void set_stable(bool stable) { set_annotation(_field_Stable); }
1118 bool is_stable() const { return has_annotation(_field_Stable); }
1119 };
1120
1121 // This class also doubles as a holder for metadata cleanup.
1122 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1123 private:
1124 ClassLoaderData* _loader_data;
1125 AnnotationArray* _field_annotations;
1126 AnnotationArray* _field_type_annotations;
1127 public:
1128 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1129 AnnotationCollector(_in_field),
1130 _loader_data(loader_data),
1131 _field_annotations(NULL),
1132 _field_type_annotations(NULL) {}
1133 ~FieldAnnotationCollector();
1134 void apply_to(FieldInfo* f);
1135 AnnotationArray* field_annotations() { return _field_annotations; }
1136 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1137
1138 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1139 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1140 };
1141
1142 class MethodAnnotationCollector : public AnnotationCollector{
1143 public:
1144 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1145 void apply_to(const methodHandle& m);
1146 };
1147
1148 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1149 public:
1150 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1151 void apply_to(InstanceKlass* ik);
1152 };
1153
1154
1155 static int skip_annotation_value(const u1*, int, int); // fwd decl
1156
1157 // Safely increment index by val if does not pass limit
1158 #define SAFE_ADD(index, limit, val) \
1159 if (index >= limit - val) return limit; \
1160 index += val;
1161
1162 // Skip an annotation. Return >=limit if there is any problem.
1163 static int skip_annotation(const u1* buffer, int limit, int index) {
1164 assert(buffer != NULL, "invariant");
1165 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1166 // value := switch (tag:u1) { ... }
1167 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1168 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1169 while (--nmem >= 0 && index < limit) {
1170 SAFE_ADD(index, limit, 2); // skip member
1171 index = skip_annotation_value(buffer, limit, index);
1172 }
1173 return index;
1174 }
1175
1176 // Skip an annotation value. Return >=limit if there is any problem.
1177 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1178 assert(buffer != NULL, "invariant");
1179
1180 // value := switch (tag:u1) {
1181 // case B, C, I, S, Z, D, F, J, c: con:u2;
1182 // case e: e_class:u2 e_name:u2;
1183 // case s: s_con:u2;
1184 // case [: do(nval:u2) {value};
1185 // case @: annotation;
1186 // case s: s_con:u2;
1187 // }
1188 SAFE_ADD(index, limit, 1); // read tag
1189 const u1 tag = buffer[index - 1];
1190 switch (tag) {
1191 case 'B':
1192 case 'C':
1193 case 'I':
1194 case 'S':
1195 case 'Z':
1196 case 'D':
1197 case 'F':
1198 case 'J':
1199 case 'c':
1200 case 's':
1201 SAFE_ADD(index, limit, 2); // skip con or s_con
1202 break;
1203 case 'e':
1204 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1205 break;
1206 case '[':
1207 {
1208 SAFE_ADD(index, limit, 2); // read nval
1209 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1210 while (--nval >= 0 && index < limit) {
1211 index = skip_annotation_value(buffer, limit, index);
1212 }
1213 }
1214 break;
1215 case '@':
1216 index = skip_annotation(buffer, limit, index);
1217 break;
1218 default:
1219 return limit; // bad tag byte
1220 }
1221 return index;
1222 }
1223
1224 // Sift through annotations, looking for those significant to the VM:
1225 static void parse_annotations(const ConstantPool* const cp,
1226 const u1* buffer, int limit,
1227 AnnotationCollector* coll,
1228 ClassLoaderData* loader_data,
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);
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.
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 CHECK);
1401 cfs->skip_u1_fast(runtime_visible_annotations_length);
1402 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1403 if (runtime_invisible_annotations_exists) {
1404 classfile_parse_error(
1405 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1406 }
1407 runtime_invisible_annotations_exists = true;
1408 if (PreserveAllAnnotations) {
1409 runtime_invisible_annotations_length = attribute_length;
1410 runtime_invisible_annotations = cfs->current();
1411 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1412 }
1413 cfs->skip_u1(attribute_length, CHECK);
1414 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1415 if (runtime_visible_type_annotations != NULL) {
1416 classfile_parse_error(
1417 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1418 }
1419 runtime_visible_type_annotations_length = attribute_length;
1420 runtime_visible_type_annotations = cfs->current();
1421 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1422 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1423 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1424 if (runtime_invisible_type_annotations_exists) {
1425 classfile_parse_error(
1426 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1427 } else {
1428 runtime_invisible_type_annotations_exists = true;
1429 }
1430 if (PreserveAllAnnotations) {
1431 runtime_invisible_type_annotations_length = attribute_length;
1432 runtime_invisible_type_annotations = cfs->current();
1433 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1434 }
1435 cfs->skip_u1(attribute_length, CHECK);
1436 } else {
1437 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1438 }
1439 } else {
1440 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1441 }
1442 }
1443
1444 *constantvalue_index_addr = constantvalue_index;
1445 *is_synthetic_addr = is_synthetic;
1446 *generic_signature_index_addr = generic_signature_index;
1447 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1448 runtime_visible_annotations_length,
1449 runtime_invisible_annotations,
1450 runtime_invisible_annotations_length,
1451 CHECK);
1452 parsed_annotations->set_field_annotations(a);
1453 a = assemble_annotations(runtime_visible_type_annotations,
1454 runtime_visible_type_annotations_length,
1455 runtime_invisible_type_annotations,
1456 runtime_invisible_type_annotations_length,
1457 CHECK);
1458 parsed_annotations->set_field_type_annotations(a);
1459 return;
1460 }
1461
1462
1463 // Field allocation types. Used for computing field offsets.
1464
1465 enum FieldAllocationType {
1466 STATIC_OOP, // Oops
1467 STATIC_BYTE, // Boolean, Byte, char
1468 STATIC_SHORT, // shorts
1469 STATIC_WORD, // ints
1470 STATIC_DOUBLE, // aligned long or double
1471 STATIC_FLATTENABLE, // flattenable field
1472 NONSTATIC_OOP,
1473 NONSTATIC_BYTE,
1474 NONSTATIC_SHORT,
1475 NONSTATIC_WORD,
1476 NONSTATIC_DOUBLE,
1477 NONSTATIC_FLATTENABLE,
1478 MAX_FIELD_ALLOCATION_TYPE,
1479 BAD_ALLOCATION_TYPE = -1
1480 };
1481
1482 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1483 BAD_ALLOCATION_TYPE, // 0
1484 BAD_ALLOCATION_TYPE, // 1
1485 BAD_ALLOCATION_TYPE, // 2
1486 BAD_ALLOCATION_TYPE, // 3
1487 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1488 NONSTATIC_SHORT, // T_CHAR = 5,
1489 NONSTATIC_WORD, // T_FLOAT = 6,
1490 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1491 NONSTATIC_BYTE, // T_BYTE = 8,
1492 NONSTATIC_SHORT, // T_SHORT = 9,
1493 NONSTATIC_WORD, // T_INT = 10,
1494 NONSTATIC_DOUBLE, // T_LONG = 11,
1495 NONSTATIC_OOP, // T_OBJECT = 12,
1496 NONSTATIC_OOP, // T_ARRAY = 13,
1497 NONSTATIC_OOP, // T_VALUETYPE = 14,
1498 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1499 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1500 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1501 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1502 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1503 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20,
1504 BAD_ALLOCATION_TYPE, // 0
1505 BAD_ALLOCATION_TYPE, // 1
1506 BAD_ALLOCATION_TYPE, // 2
1507 BAD_ALLOCATION_TYPE, // 3
1508 STATIC_BYTE , // T_BOOLEAN = 4,
1509 STATIC_SHORT, // T_CHAR = 5,
1510 STATIC_WORD, // T_FLOAT = 6,
1511 STATIC_DOUBLE, // T_DOUBLE = 7,
1512 STATIC_BYTE, // T_BYTE = 8,
1513 STATIC_SHORT, // T_SHORT = 9,
1514 STATIC_WORD, // T_INT = 10,
1515 STATIC_DOUBLE, // T_LONG = 11,
1516 STATIC_OOP, // T_OBJECT = 12,
1517 STATIC_OOP, // T_ARRAY = 13,
1518 STATIC_OOP, // T_VALUETYPE = 14,
1519 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1520 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1521 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1522 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1523 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1524 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20
1525 };
1526
1527 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type, bool is_flattenable) {
1528 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1529 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1530 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1531 if (is_flattenable) {
1532 result = is_static ? STATIC_FLATTENABLE : NONSTATIC_FLATTENABLE;
1533 }
1534 return result;
1535 }
1536
1537 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1538 public:
1539 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1540
1541 FieldAllocationCount() {
1542 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1543 count[i] = 0;
1544 }
1545 }
1546
1547 FieldAllocationType update(bool is_static, BasicType type, bool is_flattenable) {
1548 FieldAllocationType atype = basic_type_to_atype(is_static, type, is_flattenable);
1549 if (atype != BAD_ALLOCATION_TYPE) {
1550 // Make sure there is no overflow with injected fields.
1551 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1552 count[atype]++;
1553 }
1554 return atype;
1555 }
1556 };
1557
1558 // Side-effects: populates the _fields, _fields_annotations,
1559 // _fields_type_annotations fields
1560 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1561 bool is_interface,
1562 bool is_value_type,
1563 FieldAllocationCount* const fac,
1564 ConstantPool* cp,
1565 const int cp_size,
1566 u2* const java_fields_count_ptr,
1567 TRAPS) {
1568
1569 assert(cfs != NULL, "invariant");
1570 assert(fac != NULL, "invariant");
1571 assert(cp != NULL, "invariant");
1572 assert(java_fields_count_ptr != NULL, "invariant");
1573
1574 assert(NULL == _fields, "invariant");
1575 assert(NULL == _fields_annotations, "invariant");
1576 assert(NULL == _fields_type_annotations, "invariant");
1577
1578 cfs->guarantee_more(2, CHECK); // length
1579 const u2 length = cfs->get_u2_fast();
1580 *java_fields_count_ptr = length;
1581
1582 int num_injected = 0;
1583 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1584 &num_injected);
1585
1586 const int total_fields = length + num_injected + (is_value_type ? 1 : 0);
1587
1588 // The field array starts with tuples of shorts
1589 // [access, name index, sig index, initial value index, byte offset].
1590 // A generic signature slot only exists for field with generic
1591 // signature attribute. And the access flag is set with
1592 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1593 // signature slots are at the end of the field array and after all
1594 // other fields data.
1595 //
1596 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1597 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1598 // ...
1599 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1600 // [generic signature index]
1601 // [generic signature index]
1602 // ...
1603 //
1604 // Allocate a temporary resource array for field data. For each field,
1605 // a slot is reserved in the temporary array for the generic signature
1606 // index. After parsing all fields, the data are copied to a permanent
1607 // array and any unused slots will be discarded.
1608 ResourceMark rm(THREAD);
1609 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1610 u2,
1611 total_fields * (FieldInfo::field_slots + 1));
1612
1613 // The generic signature slots start after all other fields' data.
1614 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1615 int num_generic_signature = 0;
1616 for (int n = 0; n < length; n++) {
1617 // access_flags, name_index, descriptor_index, attributes_count
1618 cfs->guarantee_more(8, CHECK);
1619
1620 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1621
1622 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1623 verify_legal_field_modifiers(flags, is_interface, is_value_type, CHECK);
1624 AccessFlags access_flags;
1625 access_flags.set_flags(flags);
1626
1627 const u2 name_index = cfs->get_u2_fast();
1628 check_property(valid_symbol_at(name_index),
1629 "Invalid constant pool index %u for field name in class file %s",
1630 name_index, CHECK);
1631 const Symbol* const name = cp->symbol_at(name_index);
1632 verify_legal_field_name(name, CHECK);
1633
1634 const u2 signature_index = cfs->get_u2_fast();
1635 check_property(valid_symbol_at(signature_index),
1636 "Invalid constant pool index %u for field signature in class file %s",
1637 signature_index, CHECK);
1638 const Symbol* const sig = cp->symbol_at(signature_index);
1639 verify_legal_field_signature(name, sig, CHECK);
1640 assert(!access_flags.is_flattenable(), "ACC_FLATTENABLE should have been filtered out");
1641 if (sig->is_Q_signature()) {
1642 // assert(_major_version >= CONSTANT_CLASS_DESCRIPTORS, "Q-descriptors are only supported in recent classfiles");
1643 access_flags.set_is_flattenable();
1644 }
1645 if (access_flags.is_flattenable()) {
1646 // Array flattenability cannot be specified. Arrays of value classes are
1647 // are always flattenable. Arrays of other classes are not flattenable.
1648 if (sig->utf8_length() > 1 && sig->char_at(0) == '[') {
1649 classfile_parse_error(
1650 "Field \"%s\" with signature \"%s\" in class file %s is invalid."
1651 " ACC_FLATTENABLE cannot be specified for an array",
1652 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1653 }
1654 _has_flattenable_fields = true;
1655 }
1656
1657 u2 constantvalue_index = 0;
1658 bool is_synthetic = false;
1659 u2 generic_signature_index = 0;
1660 const bool is_static = access_flags.is_static();
1661 FieldAnnotationCollector parsed_annotations(_loader_data);
1662
1663 const u2 attributes_count = cfs->get_u2_fast();
1664 if (attributes_count > 0) {
1665 parse_field_attributes(cfs,
1666 attributes_count,
1667 is_static,
1668 signature_index,
1669 &constantvalue_index,
1670 &is_synthetic,
1671 &generic_signature_index,
1672 &parsed_annotations,
1673 CHECK);
1674
1675 if (parsed_annotations.field_annotations() != NULL) {
1676 if (_fields_annotations == NULL) {
1677 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1678 _loader_data, length, NULL,
1679 CHECK);
1680 }
1681 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1682 parsed_annotations.set_field_annotations(NULL);
1683 }
1684 if (parsed_annotations.field_type_annotations() != NULL) {
1685 if (_fields_type_annotations == NULL) {
1686 _fields_type_annotations =
1687 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1688 length,
1689 NULL,
1690 CHECK);
1691 }
1692 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1693 parsed_annotations.set_field_type_annotations(NULL);
1694 }
1695
1696 if (is_synthetic) {
1697 access_flags.set_is_synthetic();
1698 }
1699 if (generic_signature_index != 0) {
1700 access_flags.set_field_has_generic_signature();
1701 fa[generic_signature_slot] = generic_signature_index;
1702 generic_signature_slot ++;
1703 num_generic_signature ++;
1704 }
1705 }
1706
1707 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1708 field->initialize(access_flags.as_short(),
1709 name_index,
1710 signature_index,
1711 constantvalue_index);
1712 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1713
1714 // Remember how many oops we encountered and compute allocation type
1715 const FieldAllocationType atype = fac->update(is_static, type, access_flags.is_flattenable());
1716 field->set_allocation_type(atype);
1717
1718 // After field is initialized with type, we can augment it with aux info
1719 if (parsed_annotations.has_any_annotations())
1720 parsed_annotations.apply_to(field);
1721 }
1722
1723 int index = length;
1724 if (num_injected != 0) {
1725 for (int n = 0; n < num_injected; n++) {
1726 // Check for duplicates
1727 if (injected[n].may_be_java) {
1728 const Symbol* const name = injected[n].name();
1729 const Symbol* const signature = injected[n].signature();
1730 bool duplicate = false;
1731 for (int i = 0; i < length; i++) {
1732 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1733 if (name == cp->symbol_at(f->name_index()) &&
1734 signature == cp->symbol_at(f->signature_index())) {
1735 // Symbol is desclared in Java so skip this one
1736 duplicate = true;
1737 break;
1738 }
1739 }
1740 if (duplicate) {
1741 // These will be removed from the field array at the end
1742 continue;
1743 }
1744 }
1745
1746 // Injected field
1747 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1748 field->initialize(JVM_ACC_FIELD_INTERNAL,
1749 injected[n].name_index,
1750 injected[n].signature_index,
1751 0);
1752
1753 const BasicType type = FieldType::basic_type(injected[n].signature());
1754
1755 // Remember how many oops we encountered and compute allocation type
1756 const FieldAllocationType atype = fac->update(false, type, false);
1757 field->set_allocation_type(atype);
1758 index++;
1759 }
1760 }
1761
1762 if (is_value_type) {
1763 index = length + num_injected;
1764 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1765 field->initialize(JVM_ACC_FIELD_INTERNAL | JVM_ACC_STATIC,
1766 vmSymbols::default_value_name_enum,
1767 vmSymbols::java_lang_Object_enum,
1768 0);
1769 const BasicType type = FieldType::basic_type(vmSymbols::object_signature());
1770 const FieldAllocationType atype = fac->update(true, type, false);
1771 field->set_allocation_type(atype);
1772 index++;
1773 }
1774
1775 assert(NULL == _fields, "invariant");
1776
1777 _fields =
1778 MetadataFactory::new_array<u2>(_loader_data,
1779 index * FieldInfo::field_slots + num_generic_signature,
1780 CHECK);
1781 // Sometimes injected fields already exist in the Java source so
1782 // the fields array could be too long. In that case the
1783 // fields array is trimed. Also unused slots that were reserved
1784 // for generic signature indexes are discarded.
1785 {
1786 int i = 0;
1787 for (; i < index * FieldInfo::field_slots; i++) {
1788 _fields->at_put(i, fa[i]);
1789 }
1790 for (int j = total_fields * FieldInfo::field_slots;
1791 j < generic_signature_slot; j++) {
1792 _fields->at_put(i++, fa[j]);
1793 }
1794 assert(_fields->length() == i, "");
1795 }
1796
1797 if (_need_verify && length > 1) {
1798 // Check duplicated fields
1799 ResourceMark rm(THREAD);
1800 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1801 THREAD, NameSigHash*, HASH_ROW_SIZE);
1802 initialize_hashtable(names_and_sigs);
1803 bool dup = false;
1804 const Symbol* name = NULL;
1805 const Symbol* sig = NULL;
1806 {
1807 debug_only(NoSafepointVerifier nsv;)
1808 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1809 name = fs.name();
1810 sig = fs.signature();
1811 // If no duplicates, add name/signature in hashtable names_and_sigs.
1812 if (!put_after_lookup(name, sig, names_and_sigs)) {
1813 dup = true;
1814 break;
1815 }
1816 }
1817 }
1818 if (dup) {
1819 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1820 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1821 }
1822 }
1823 }
1824
1825
1826 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1827 u4 code_length,
1828 u4 exception_table_length,
1829 TRAPS) {
1830 assert(cfs != NULL, "invariant");
1831
1832 const unsafe_u2* const exception_table_start = cfs->current();
1833 assert(exception_table_start != NULL, "null exception table");
1834
1835 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1836 // end_pc,
1837 // handler_pc,
1838 // catch_type_index
1839
1840 // Will check legal target after parsing code array in verifier.
1841 if (_need_verify) {
1842 for (unsigned int i = 0; i < exception_table_length; i++) {
1843 const u2 start_pc = cfs->get_u2_fast();
1844 const u2 end_pc = cfs->get_u2_fast();
1845 const u2 handler_pc = cfs->get_u2_fast();
1846 const u2 catch_type_index = cfs->get_u2_fast();
1847 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1848 "Illegal exception table range in class file %s",
1849 CHECK_NULL);
1850 guarantee_property(handler_pc < code_length,
1851 "Illegal exception table handler in class file %s",
1852 CHECK_NULL);
1853 if (catch_type_index != 0) {
1854 guarantee_property(valid_klass_reference_at(catch_type_index),
1855 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1856 }
1857 }
1858 } else {
1859 cfs->skip_u2_fast(exception_table_length * 4);
1860 }
1861 return exception_table_start;
1862 }
1863
1864 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1865 u4 code_length,
1866 CompressedLineNumberWriteStream**const write_stream,
1867 TRAPS) {
1868
1869 const ClassFileStream* const cfs = _stream;
1870 unsigned int num_entries = cfs->get_u2(CHECK);
1871
1872 // Each entry is a u2 start_pc, and a u2 line_number
1873 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1874
1875 // Verify line number attribute and table length
1876 check_property(
1877 code_attribute_length == sizeof(u2) + length_in_bytes,
1878 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1879
1880 cfs->guarantee_more(length_in_bytes, CHECK);
1881
1882 if ((*write_stream) == NULL) {
1883 if (length_in_bytes > fixed_buffer_size) {
1884 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1885 } else {
1886 (*write_stream) = new CompressedLineNumberWriteStream(
1887 _linenumbertable_buffer, fixed_buffer_size);
1888 }
1889 }
1890
1891 while (num_entries-- > 0) {
1892 const u2 bci = cfs->get_u2_fast(); // start_pc
1893 const u2 line = cfs->get_u2_fast(); // line_number
1894 guarantee_property(bci < code_length,
1895 "Invalid pc in LineNumberTable in class file %s", CHECK);
1896 (*write_stream)->write_pair(bci, line);
1897 }
1898 }
1899
1900
1901 class LVT_Hash : public AllStatic {
1902 public:
1903
1904 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1905 /*
1906 * 3-tuple start_bci/length/slot has to be unique key,
1907 * so the following comparison seems to be redundant:
1908 * && elem->name_cp_index == entry->_elem->name_cp_index
1909 */
1910 return (e0.start_bci == e1.start_bci &&
1911 e0.length == e1.length &&
1912 e0.name_cp_index == e1.name_cp_index &&
1913 e0.slot == e1.slot);
1914 }
1915
1916 static unsigned int hash(LocalVariableTableElement const& e0) {
1917 unsigned int raw_hash = e0.start_bci;
1918
1919 raw_hash = e0.length + raw_hash * 37;
1920 raw_hash = e0.name_cp_index + raw_hash * 37;
1921 raw_hash = e0.slot + raw_hash * 37;
1922
1923 return raw_hash;
1924 }
1925 };
1926
1927
1928 // Class file LocalVariableTable elements.
1929 class Classfile_LVT_Element {
1930 public:
1931 u2 start_bci;
1932 u2 length;
1933 u2 name_cp_index;
1934 u2 descriptor_cp_index;
1935 u2 slot;
1936 };
1937
1938 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1939 LocalVariableTableElement* const lvt) {
1940 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1941 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1942 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1943 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1944 lvt->signature_cp_index = 0;
1945 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1946 }
1947
1948 // Function is used to parse both attributes:
1949 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1950 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1951 u4 code_length,
1952 u2 max_locals,
1953 u4 code_attribute_length,
1954 u2* const localvariable_table_length,
1955 bool isLVTT,
1956 TRAPS) {
1957 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1958 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1959 const unsigned int size =
1960 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1961
1962 const ConstantPool* const cp = _cp;
1963
1964 // Verify local variable table attribute has right length
1965 if (_need_verify) {
1966 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1967 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1968 }
1969
1970 const unsafe_u2* const localvariable_table_start = cfs->current();
1971 assert(localvariable_table_start != NULL, "null local variable table");
1972 if (!_need_verify) {
1973 cfs->skip_u2_fast(size);
1974 } else {
1975 cfs->guarantee_more(size * 2, CHECK_NULL);
1976 for(int i = 0; i < (*localvariable_table_length); i++) {
1977 const u2 start_pc = cfs->get_u2_fast();
1978 const u2 length = cfs->get_u2_fast();
1979 const u2 name_index = cfs->get_u2_fast();
1980 const u2 descriptor_index = cfs->get_u2_fast();
1981 const u2 index = cfs->get_u2_fast();
1982 // Assign to a u4 to avoid overflow
1983 const u4 end_pc = (u4)start_pc + (u4)length;
1984
1985 if (start_pc >= code_length) {
1986 classfile_parse_error(
1987 "Invalid start_pc %u in %s in class file %s",
1988 start_pc, tbl_name, CHECK_NULL);
1989 }
1990 if (end_pc > code_length) {
1991 classfile_parse_error(
1992 "Invalid length %u in %s in class file %s",
1993 length, tbl_name, CHECK_NULL);
1994 }
1995 const int cp_size = cp->length();
1996 guarantee_property(valid_symbol_at(name_index),
1997 "Name index %u in %s has bad constant type in class file %s",
1998 name_index, tbl_name, CHECK_NULL);
1999 guarantee_property(valid_symbol_at(descriptor_index),
2000 "Signature index %u in %s has bad constant type in class file %s",
2001 descriptor_index, tbl_name, CHECK_NULL);
2002
2003 const Symbol* const name = cp->symbol_at(name_index);
2004 const Symbol* const sig = cp->symbol_at(descriptor_index);
2005 verify_legal_field_name(name, CHECK_NULL);
2006 u2 extra_slot = 0;
2007 if (!isLVTT) {
2008 verify_legal_field_signature(name, sig, CHECK_NULL);
2009
2010 // 4894874: check special cases for double and long local variables
2011 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
2012 sig == vmSymbols::type_signature(T_LONG)) {
2013 extra_slot = 1;
2014 }
2015 }
2016 guarantee_property((index + extra_slot) < max_locals,
2017 "Invalid index %u in %s in class file %s",
2018 index, tbl_name, CHECK_NULL);
2019 }
2020 }
2021 return localvariable_table_start;
2022 }
2023
2024
2025 void ClassFileParser::parse_type_array(u2 array_length,
2026 u4 code_length,
2027 u4* const u1_index,
2028 u4* const u2_index,
2029 u1* const u1_array,
2030 u2* const u2_array,
2031 TRAPS) {
2032 const ClassFileStream* const cfs = _stream;
2033 u2 index = 0; // index in the array with long/double occupying two slots
2034 u4 i1 = *u1_index;
2035 u4 i2 = *u2_index + 1;
2036 for(int i = 0; i < array_length; i++) {
2037 const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
2038 index++;
2039 if (tag == ITEM_Long || tag == ITEM_Double) {
2040 index++;
2041 } else if (tag == ITEM_Object) {
2042 const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
2043 guarantee_property(valid_klass_reference_at(class_index),
2044 "Bad class index %u in StackMap in class file %s",
2045 class_index, CHECK);
2046 } else if (tag == ITEM_Uninitialized) {
2047 const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
2048 guarantee_property(
2049 offset < code_length,
2050 "Bad uninitialized type offset %u in StackMap in class file %s",
2051 offset, CHECK);
2052 } else {
2053 guarantee_property(
2054 tag <= (u1)ITEM_Uninitialized,
2055 "Unknown variable type %u in StackMap in class file %s",
2056 tag, CHECK);
2057 }
2058 }
2059 u2_array[*u2_index] = index;
2060 *u1_index = i1;
2061 *u2_index = i2;
2062 }
2063
2064 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
2065 u4 code_attribute_length,
2066 bool need_verify,
2067 TRAPS) {
2068 assert(cfs != NULL, "invariant");
2069
2070 if (0 == code_attribute_length) {
2071 return NULL;
2072 }
2073
2074 const u1* const stackmap_table_start = cfs->current();
2075 assert(stackmap_table_start != NULL, "null stackmap table");
2076
2077 // check code_attribute_length first
2078 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2079
2080 if (!need_verify && !DumpSharedSpaces) {
2081 return NULL;
2082 }
2083 return stackmap_table_start;
2084 }
2085
2086 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2087 u2* const checked_exceptions_length,
2088 u4 method_attribute_length,
2089 TRAPS) {
2090 assert(cfs != NULL, "invariant");
2091 assert(checked_exceptions_length != NULL, "invariant");
2092
2093 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2094 *checked_exceptions_length = cfs->get_u2_fast();
2095 const unsigned int size =
2096 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2097 const unsafe_u2* const checked_exceptions_start = cfs->current();
2098 assert(checked_exceptions_start != NULL, "null checked exceptions");
2099 if (!_need_verify) {
2100 cfs->skip_u2_fast(size);
2101 } else {
2102 // Verify each value in the checked exception table
2103 u2 checked_exception;
2104 const u2 len = *checked_exceptions_length;
2105 cfs->guarantee_more(2 * len, CHECK_NULL);
2106 for (int i = 0; i < len; i++) {
2107 checked_exception = cfs->get_u2_fast();
2108 check_property(
2109 valid_klass_reference_at(checked_exception),
2110 "Exception name has bad type at constant pool %u in class file %s",
2111 checked_exception, CHECK_NULL);
2112 }
2113 }
2114 // check exceptions attribute length
2115 if (_need_verify) {
2116 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2117 sizeof(u2) * size),
2118 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2119 }
2120 return checked_exceptions_start;
2121 }
2122
2123 void ClassFileParser::throwIllegalSignature(const char* type,
2124 const Symbol* name,
2125 const Symbol* sig,
2126 TRAPS) const {
2127 assert(name != NULL, "invariant");
2128 assert(sig != NULL, "invariant");
2129
2130 ResourceMark rm(THREAD);
2131 Exceptions::fthrow(THREAD_AND_LOCATION,
2132 vmSymbols::java_lang_ClassFormatError(),
2133 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2134 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2135 }
2136
2137 AnnotationCollector::ID
2138 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2139 const Symbol* name) {
2140 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2141 // Privileged code can use all annotations. Other code silently drops some.
2142 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2143 loader_data->is_platform_class_loader_data() ||
2144 loader_data->is_unsafe_anonymous();
2145 switch (sid) {
2146 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2147 if (_location != _in_method) break; // only allow for methods
2148 if (!privileged) break; // only allow in privileged code
2149 return _method_CallerSensitive;
2150 }
2151 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2152 if (_location != _in_method) break; // only allow for methods
2153 if (!privileged) break; // only allow in privileged code
2154 return _method_ForceInline;
2155 }
2156 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2157 if (_location != _in_method) break; // only allow for methods
2158 if (!privileged) break; // only allow in privileged code
2159 return _method_DontInline;
2160 }
2161 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2162 if (_location != _in_method) break; // only allow for methods
2163 if (!privileged) break; // only allow in privileged code
2164 return _method_InjectedProfile;
2165 }
2166 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2167 if (_location != _in_method) break; // only allow for methods
2168 if (!privileged) break; // only allow in privileged code
2169 return _method_LambdaForm_Compiled;
2170 }
2171 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): {
2172 if (_location != _in_method) break; // only allow for methods
2173 if (!privileged) break; // only allow in privileged code
2174 return _method_Hidden;
2175 }
2176 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_security_AccessController_Hidden_signature): {
2177 if (_location != _in_method) break; // only allow for methods
2178 if (!privileged) break; // only allow in privileged code
2179 return _method_Hidden;
2180 }
2181 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2182 if (_location != _in_method) break; // only allow for methods
2183 if (!privileged) break; // only allow in privileged code
2184 return _method_HotSpotIntrinsicCandidate;
2185 }
2186 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2187 if (_location != _in_field) break; // only allow for fields
2188 if (!privileged) break; // only allow in privileged code
2189 return _field_Stable;
2190 }
2191 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2192 if (_location != _in_field && _location != _in_class) {
2193 break; // only allow for fields and classes
2194 }
2195 if (!EnableContended || (RestrictContended && !privileged)) {
2196 break; // honor privileges
2197 }
2198 return _jdk_internal_vm_annotation_Contended;
2199 }
2200 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2201 if (_location != _in_method) break; // only allow for methods
2202 if (RestrictReservedStack && !privileged) break; // honor privileges
2203 return _jdk_internal_vm_annotation_ReservedStackAccess;
2204 }
2205 default: {
2206 break;
2207 }
2208 }
2209 return AnnotationCollector::_unknown;
2210 }
2211
2212 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2213 if (is_contended())
2214 f->set_contended_group(contended_group());
2215 if (is_stable())
2216 f->set_stable(true);
2217 }
2218
2219 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2220 // If there's an error deallocate metadata for field annotations
2221 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2222 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2223 }
2224
2225 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2226 if (has_annotation(_method_CallerSensitive))
2227 m->set_caller_sensitive(true);
2228 if (has_annotation(_method_ForceInline))
2229 m->set_force_inline(true);
2230 if (has_annotation(_method_DontInline))
2231 m->set_dont_inline(true);
2232 if (has_annotation(_method_InjectedProfile))
2233 m->set_has_injected_profile(true);
2234 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2235 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2236 if (has_annotation(_method_Hidden))
2237 m->set_hidden(true);
2238 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2239 m->set_intrinsic_candidate(true);
2240 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2241 m->set_has_reserved_stack_access(true);
2242 }
2243
2244 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2245 assert(ik != NULL, "invariant");
2246 ik->set_is_contended(is_contended());
2247 }
2248
2249 #define MAX_ARGS_SIZE 255
2250 #define MAX_CODE_SIZE 65535
2251 #define INITIAL_MAX_LVT_NUMBER 256
2252
2253 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2254 *
2255 * Rules for LVT's and LVTT's are:
2256 * - There can be any number of LVT's and LVTT's.
2257 * - If there are n LVT's, it is the same as if there was just
2258 * one LVT containing all the entries from the n LVT's.
2259 * - There may be no more than one LVT entry per local variable.
2260 * Two LVT entries are 'equal' if these fields are the same:
2261 * start_pc, length, name, slot
2262 * - There may be no more than one LVTT entry per each LVT entry.
2263 * Each LVTT entry has to match some LVT entry.
2264 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2265 */
2266 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2267 int lvt_cnt,
2268 u2* const localvariable_table_length,
2269 const unsafe_u2** const localvariable_table_start,
2270 int lvtt_cnt,
2271 u2* const localvariable_type_table_length,
2272 const unsafe_u2** const localvariable_type_table_start,
2273 TRAPS) {
2274
2275 ResourceMark rm(THREAD);
2276
2277 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2278 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2279
2280 LVT_HashTable* const table = new LVT_HashTable();
2281
2282 // To fill LocalVariableTable in
2283 const Classfile_LVT_Element* cf_lvt;
2284 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2285
2286 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2287 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2288 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2289 copy_lvt_element(&cf_lvt[idx], lvt);
2290 // If no duplicates, add LVT elem in hashtable.
2291 if (table->put(*lvt, lvt) == false
2292 && _need_verify
2293 && _major_version >= JAVA_1_5_VERSION) {
2294 classfile_parse_error("Duplicated LocalVariableTable attribute "
2295 "entry for '%s' in class file %s",
2296 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2297 CHECK);
2298 }
2299 }
2300 }
2301
2302 // To merge LocalVariableTable and LocalVariableTypeTable
2303 const Classfile_LVT_Element* cf_lvtt;
2304 LocalVariableTableElement lvtt_elem;
2305
2306 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2307 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2308 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2309 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2310 LocalVariableTableElement** entry = table->get(lvtt_elem);
2311 if (entry == NULL) {
2312 if (_need_verify) {
2313 classfile_parse_error("LVTT entry for '%s' in class file %s "
2314 "does not match any LVT entry",
2315 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2316 CHECK);
2317 }
2318 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2319 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2320 "entry for '%s' in class file %s",
2321 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2322 CHECK);
2323 } else {
2324 // to add generic signatures into LocalVariableTable
2325 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2326 }
2327 }
2328 }
2329 }
2330
2331
2332 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2333 const u1* runtime_visible_annotations,
2334 int runtime_visible_annotations_length,
2335 const u1* runtime_invisible_annotations,
2336 int runtime_invisible_annotations_length,
2337 const u1* runtime_visible_parameter_annotations,
2338 int runtime_visible_parameter_annotations_length,
2339 const u1* runtime_invisible_parameter_annotations,
2340 int runtime_invisible_parameter_annotations_length,
2341 const u1* runtime_visible_type_annotations,
2342 int runtime_visible_type_annotations_length,
2343 const u1* runtime_invisible_type_annotations,
2344 int runtime_invisible_type_annotations_length,
2345 const u1* annotation_default,
2346 int annotation_default_length,
2347 TRAPS) {
2348
2349 AnnotationArray* a;
2350
2351 if (runtime_visible_annotations_length +
2352 runtime_invisible_annotations_length > 0) {
2353 a = assemble_annotations(runtime_visible_annotations,
2354 runtime_visible_annotations_length,
2355 runtime_invisible_annotations,
2356 runtime_invisible_annotations_length,
2357 CHECK);
2358 cm->set_method_annotations(a);
2359 }
2360
2361 if (runtime_visible_parameter_annotations_length +
2362 runtime_invisible_parameter_annotations_length > 0) {
2363 a = assemble_annotations(runtime_visible_parameter_annotations,
2364 runtime_visible_parameter_annotations_length,
2365 runtime_invisible_parameter_annotations,
2366 runtime_invisible_parameter_annotations_length,
2367 CHECK);
2368 cm->set_parameter_annotations(a);
2369 }
2370
2371 if (annotation_default_length > 0) {
2372 a = assemble_annotations(annotation_default,
2373 annotation_default_length,
2374 NULL,
2375 0,
2376 CHECK);
2377 cm->set_default_annotations(a);
2378 }
2379
2380 if (runtime_visible_type_annotations_length +
2381 runtime_invisible_type_annotations_length > 0) {
2382 a = assemble_annotations(runtime_visible_type_annotations,
2383 runtime_visible_type_annotations_length,
2384 runtime_invisible_type_annotations,
2385 runtime_invisible_type_annotations_length,
2386 CHECK);
2387 cm->set_type_annotations(a);
2388 }
2389 }
2390
2391
2392 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2393 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2394 // Method* to save footprint, so we only know the size of the resulting Method* when the
2395 // entire method attribute is parsed.
2396 //
2397 // The promoted_flags parameter is used to pass relevant access_flags
2398 // from the method back up to the containing klass. These flag values
2399 // are added to klass's access_flags.
2400
2401 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2402 bool is_interface,
2403 bool is_value_type,
2404 const ConstantPool* cp,
2405 AccessFlags* const promoted_flags,
2406 TRAPS) {
2407 assert(cfs != NULL, "invariant");
2408 assert(cp != NULL, "invariant");
2409 assert(promoted_flags != NULL, "invariant");
2410
2411 ResourceMark rm(THREAD);
2412 // Parse fixed parts:
2413 // access_flags, name_index, descriptor_index, attributes_count
2414 cfs->guarantee_more(8, CHECK_NULL);
2415
2416 int flags = cfs->get_u2_fast();
2417 const u2 name_index = cfs->get_u2_fast();
2418 const int cp_size = cp->length();
2419 check_property(
2420 valid_symbol_at(name_index),
2421 "Illegal constant pool index %u for method name in class file %s",
2422 name_index, CHECK_NULL);
2423 const Symbol* const name = cp->symbol_at(name_index);
2424 verify_legal_method_name(name, CHECK_NULL);
2425
2426 const u2 signature_index = cfs->get_u2_fast();
2427 guarantee_property(
2428 valid_symbol_at(signature_index),
2429 "Illegal constant pool index %u for method signature in class file %s",
2430 signature_index, CHECK_NULL);
2431 const Symbol* const signature = cp->symbol_at(signature_index);
2432
2433 if (name == vmSymbols::class_initializer_name()) {
2434 // We ignore the other access flags for a valid class initializer.
2435 // (JVM Spec 2nd ed., chapter 4.6)
2436 if (_major_version < 51) { // backward compatibility
2437 flags = JVM_ACC_STATIC;
2438 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2439 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2440 } else {
2441 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2442 }
2443 } else {
2444 verify_legal_method_modifiers(flags, is_interface, is_value_type, name, CHECK_NULL);
2445 }
2446
2447 if (name == vmSymbols::object_initializer_name()) {
2448 if (is_interface) {
2449 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2450 /* TBD: uncomment when javac stops generating <init>() for value types.
2451 } else if (is_value_type) {
2452 classfile_parse_error("Value Type cannot have a method named <init>, class file %s", CHECK_NULL);
2453 */
2454 }
2455 }
2456
2457 int args_size = -1; // only used when _need_verify is true
2458 if (_need_verify) {
2459 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2460 verify_legal_method_signature(name, signature, CHECK_NULL);
2461 if (args_size > MAX_ARGS_SIZE) {
2462 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2463 }
2464 }
2465
2466 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2467
2468 // Default values for code and exceptions attribute elements
2469 u2 max_stack = 0;
2470 u2 max_locals = 0;
2471 u4 code_length = 0;
2472 const u1* code_start = 0;
2473 u2 exception_table_length = 0;
2474 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2475 Array<int>* exception_handlers = Universe::the_empty_int_array();
2476 u2 checked_exceptions_length = 0;
2477 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2478 CompressedLineNumberWriteStream* linenumber_table = NULL;
2479 int linenumber_table_length = 0;
2480 int total_lvt_length = 0;
2481 u2 lvt_cnt = 0;
2482 u2 lvtt_cnt = 0;
2483 bool lvt_allocated = false;
2484 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2485 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2486 u2* localvariable_table_length = NULL;
2487 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2488 u2* localvariable_type_table_length = NULL;
2489 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2490 int method_parameters_length = -1;
2491 const u1* method_parameters_data = NULL;
2492 bool method_parameters_seen = false;
2493 bool parsed_code_attribute = false;
2494 bool parsed_checked_exceptions_attribute = false;
2495 bool parsed_stackmap_attribute = false;
2496 // stackmap attribute - JDK1.5
2497 const u1* stackmap_data = NULL;
2498 int stackmap_data_length = 0;
2499 u2 generic_signature_index = 0;
2500 MethodAnnotationCollector parsed_annotations;
2501 const u1* runtime_visible_annotations = NULL;
2502 int runtime_visible_annotations_length = 0;
2503 const u1* runtime_invisible_annotations = NULL;
2504 int runtime_invisible_annotations_length = 0;
2505 const u1* runtime_visible_parameter_annotations = NULL;
2506 int runtime_visible_parameter_annotations_length = 0;
2507 const u1* runtime_invisible_parameter_annotations = NULL;
2508 int runtime_invisible_parameter_annotations_length = 0;
2509 const u1* runtime_visible_type_annotations = NULL;
2510 int runtime_visible_type_annotations_length = 0;
2511 const u1* runtime_invisible_type_annotations = NULL;
2512 int runtime_invisible_type_annotations_length = 0;
2513 bool runtime_invisible_annotations_exists = false;
2514 bool runtime_invisible_type_annotations_exists = false;
2515 bool runtime_invisible_parameter_annotations_exists = false;
2516 const u1* annotation_default = NULL;
2517 int annotation_default_length = 0;
2518
2519 // Parse code and exceptions attribute
2520 u2 method_attributes_count = cfs->get_u2_fast();
2521 while (method_attributes_count--) {
2522 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2523 const u2 method_attribute_name_index = cfs->get_u2_fast();
2524 const u4 method_attribute_length = cfs->get_u4_fast();
2525 check_property(
2526 valid_symbol_at(method_attribute_name_index),
2527 "Invalid method attribute name index %u in class file %s",
2528 method_attribute_name_index, CHECK_NULL);
2529
2530 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2531 if (method_attribute_name == vmSymbols::tag_code()) {
2532 // Parse Code attribute
2533 if (_need_verify) {
2534 guarantee_property(
2535 !access_flags.is_native() && !access_flags.is_abstract(),
2536 "Code attribute in native or abstract methods in class file %s",
2537 CHECK_NULL);
2538 }
2539 if (parsed_code_attribute) {
2540 classfile_parse_error("Multiple Code attributes in class file %s",
2541 CHECK_NULL);
2542 }
2543 parsed_code_attribute = true;
2544
2545 // Stack size, locals size, and code size
2546 if (_major_version == 45 && _minor_version <= 2) {
2547 cfs->guarantee_more(4, CHECK_NULL);
2548 max_stack = cfs->get_u1_fast();
2549 max_locals = cfs->get_u1_fast();
2550 code_length = cfs->get_u2_fast();
2551 } else {
2552 cfs->guarantee_more(8, CHECK_NULL);
2553 max_stack = cfs->get_u2_fast();
2554 max_locals = cfs->get_u2_fast();
2555 code_length = cfs->get_u4_fast();
2556 }
2557 if (_need_verify) {
2558 guarantee_property(args_size <= max_locals,
2559 "Arguments can't fit into locals in class file %s",
2560 CHECK_NULL);
2561 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2562 "Invalid method Code length %u in class file %s",
2563 code_length, CHECK_NULL);
2564 }
2565 // Code pointer
2566 code_start = cfs->current();
2567 assert(code_start != NULL, "null code start");
2568 cfs->guarantee_more(code_length, CHECK_NULL);
2569 cfs->skip_u1_fast(code_length);
2570
2571 // Exception handler table
2572 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2573 exception_table_length = cfs->get_u2_fast();
2574 if (exception_table_length > 0) {
2575 exception_table_start = parse_exception_table(cfs,
2576 code_length,
2577 exception_table_length,
2578 CHECK_NULL);
2579 }
2580
2581 // Parse additional attributes in code attribute
2582 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2583 u2 code_attributes_count = cfs->get_u2_fast();
2584
2585 unsigned int calculated_attribute_length = 0;
2586
2587 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2588 calculated_attribute_length =
2589 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2590 } else {
2591 // max_stack, locals and length are smaller in pre-version 45.2 classes
2592 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2593 }
2594 calculated_attribute_length +=
2595 code_length +
2596 sizeof(exception_table_length) +
2597 sizeof(code_attributes_count) +
2598 exception_table_length *
2599 ( sizeof(u2) + // start_pc
2600 sizeof(u2) + // end_pc
2601 sizeof(u2) + // handler_pc
2602 sizeof(u2) ); // catch_type_index
2603
2604 while (code_attributes_count--) {
2605 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2606 const u2 code_attribute_name_index = cfs->get_u2_fast();
2607 const u4 code_attribute_length = cfs->get_u4_fast();
2608 calculated_attribute_length += code_attribute_length +
2609 sizeof(code_attribute_name_index) +
2610 sizeof(code_attribute_length);
2611 check_property(valid_symbol_at(code_attribute_name_index),
2612 "Invalid code attribute name index %u in class file %s",
2613 code_attribute_name_index,
2614 CHECK_NULL);
2615 if (LoadLineNumberTables &&
2616 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2617 // Parse and compress line number table
2618 parse_linenumber_table(code_attribute_length,
2619 code_length,
2620 &linenumber_table,
2621 CHECK_NULL);
2622
2623 } else if (LoadLocalVariableTables &&
2624 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2625 // Parse local variable table
2626 if (!lvt_allocated) {
2627 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2628 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2629 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2630 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2631 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2632 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2633 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2634 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2635 lvt_allocated = true;
2636 }
2637 if (lvt_cnt == max_lvt_cnt) {
2638 max_lvt_cnt <<= 1;
2639 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2640 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2641 }
2642 localvariable_table_start[lvt_cnt] =
2643 parse_localvariable_table(cfs,
2644 code_length,
2645 max_locals,
2646 code_attribute_length,
2647 &localvariable_table_length[lvt_cnt],
2648 false, // is not LVTT
2649 CHECK_NULL);
2650 total_lvt_length += localvariable_table_length[lvt_cnt];
2651 lvt_cnt++;
2652 } else if (LoadLocalVariableTypeTables &&
2653 _major_version >= JAVA_1_5_VERSION &&
2654 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2655 if (!lvt_allocated) {
2656 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2657 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2658 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2659 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2660 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2661 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2662 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2663 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2664 lvt_allocated = true;
2665 }
2666 // Parse local variable type table
2667 if (lvtt_cnt == max_lvtt_cnt) {
2668 max_lvtt_cnt <<= 1;
2669 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2670 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2671 }
2672 localvariable_type_table_start[lvtt_cnt] =
2673 parse_localvariable_table(cfs,
2674 code_length,
2675 max_locals,
2676 code_attribute_length,
2677 &localvariable_type_table_length[lvtt_cnt],
2678 true, // is LVTT
2679 CHECK_NULL);
2680 lvtt_cnt++;
2681 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2682 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2683 // Stack map is only needed by the new verifier in JDK1.5.
2684 if (parsed_stackmap_attribute) {
2685 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2686 }
2687 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2688 stackmap_data_length = code_attribute_length;
2689 parsed_stackmap_attribute = true;
2690 } else {
2691 // Skip unknown attributes
2692 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2693 }
2694 }
2695 // check method attribute length
2696 if (_need_verify) {
2697 guarantee_property(method_attribute_length == calculated_attribute_length,
2698 "Code segment has wrong length in class file %s",
2699 CHECK_NULL);
2700 }
2701 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2702 // Parse Exceptions attribute
2703 if (parsed_checked_exceptions_attribute) {
2704 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2705 CHECK_NULL);
2706 }
2707 parsed_checked_exceptions_attribute = true;
2708 checked_exceptions_start =
2709 parse_checked_exceptions(cfs,
2710 &checked_exceptions_length,
2711 method_attribute_length,
2712 CHECK_NULL);
2713 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2714 // reject multiple method parameters
2715 if (method_parameters_seen) {
2716 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2717 CHECK_NULL);
2718 }
2719 method_parameters_seen = true;
2720 method_parameters_length = cfs->get_u1_fast();
2721 const u2 real_length = (method_parameters_length * 4u) + 1u;
2722 if (method_attribute_length != real_length) {
2723 classfile_parse_error(
2724 "Invalid MethodParameters method attribute length %u in class file",
2725 method_attribute_length, CHECK_NULL);
2726 }
2727 method_parameters_data = cfs->current();
2728 cfs->skip_u2_fast(method_parameters_length);
2729 cfs->skip_u2_fast(method_parameters_length);
2730 // ignore this attribute if it cannot be reflected
2731 if (!SystemDictionary::Parameter_klass_loaded())
2732 method_parameters_length = -1;
2733 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2734 if (method_attribute_length != 0) {
2735 classfile_parse_error(
2736 "Invalid Synthetic method attribute length %u in class file %s",
2737 method_attribute_length, CHECK_NULL);
2738 }
2739 // Should we check that there hasn't already been a synthetic attribute?
2740 access_flags.set_is_synthetic();
2741 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2742 if (method_attribute_length != 0) {
2743 classfile_parse_error(
2744 "Invalid Deprecated method attribute length %u in class file %s",
2745 method_attribute_length, CHECK_NULL);
2746 }
2747 } else if (_major_version >= JAVA_1_5_VERSION) {
2748 if (method_attribute_name == vmSymbols::tag_signature()) {
2749 if (generic_signature_index != 0) {
2750 classfile_parse_error(
2751 "Multiple Signature attributes for method in class file %s",
2752 CHECK_NULL);
2753 }
2754 if (method_attribute_length != 2) {
2755 classfile_parse_error(
2756 "Invalid Signature attribute length %u in class file %s",
2757 method_attribute_length, CHECK_NULL);
2758 }
2759 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2760 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2761 if (runtime_visible_annotations != NULL) {
2762 classfile_parse_error(
2763 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2764 CHECK_NULL);
2765 }
2766 runtime_visible_annotations_length = method_attribute_length;
2767 runtime_visible_annotations = cfs->current();
2768 assert(runtime_visible_annotations != NULL, "null visible annotations");
2769 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2770 parse_annotations(cp,
2771 runtime_visible_annotations,
2772 runtime_visible_annotations_length,
2773 &parsed_annotations,
2774 _loader_data,
2775 CHECK_NULL);
2776 cfs->skip_u1_fast(runtime_visible_annotations_length);
2777 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2778 if (runtime_invisible_annotations_exists) {
2779 classfile_parse_error(
2780 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2781 CHECK_NULL);
2782 }
2783 runtime_invisible_annotations_exists = true;
2784 if (PreserveAllAnnotations) {
2785 runtime_invisible_annotations_length = method_attribute_length;
2786 runtime_invisible_annotations = cfs->current();
2787 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2788 }
2789 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2790 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2791 if (runtime_visible_parameter_annotations != NULL) {
2792 classfile_parse_error(
2793 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2794 CHECK_NULL);
2795 }
2796 runtime_visible_parameter_annotations_length = method_attribute_length;
2797 runtime_visible_parameter_annotations = cfs->current();
2798 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2799 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2800 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2801 if (runtime_invisible_parameter_annotations_exists) {
2802 classfile_parse_error(
2803 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2804 CHECK_NULL);
2805 }
2806 runtime_invisible_parameter_annotations_exists = true;
2807 if (PreserveAllAnnotations) {
2808 runtime_invisible_parameter_annotations_length = method_attribute_length;
2809 runtime_invisible_parameter_annotations = cfs->current();
2810 assert(runtime_invisible_parameter_annotations != NULL,
2811 "null invisible parameter annotations");
2812 }
2813 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2814 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2815 if (annotation_default != NULL) {
2816 classfile_parse_error(
2817 "Multiple AnnotationDefault attributes for method in class file %s",
2818 CHECK_NULL);
2819 }
2820 annotation_default_length = method_attribute_length;
2821 annotation_default = cfs->current();
2822 assert(annotation_default != NULL, "null annotation default");
2823 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2824 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2825 if (runtime_visible_type_annotations != NULL) {
2826 classfile_parse_error(
2827 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2828 CHECK_NULL);
2829 }
2830 runtime_visible_type_annotations_length = method_attribute_length;
2831 runtime_visible_type_annotations = cfs->current();
2832 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2833 // No need for the VM to parse Type annotations
2834 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2835 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2836 if (runtime_invisible_type_annotations_exists) {
2837 classfile_parse_error(
2838 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2839 CHECK_NULL);
2840 } else {
2841 runtime_invisible_type_annotations_exists = true;
2842 }
2843 if (PreserveAllAnnotations) {
2844 runtime_invisible_type_annotations_length = method_attribute_length;
2845 runtime_invisible_type_annotations = cfs->current();
2846 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2847 }
2848 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2849 } else {
2850 // Skip unknown attributes
2851 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2852 }
2853 } else {
2854 // Skip unknown attributes
2855 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2856 }
2857 }
2858
2859 if (linenumber_table != NULL) {
2860 linenumber_table->write_terminator();
2861 linenumber_table_length = linenumber_table->position();
2862 }
2863
2864 // Make sure there's at least one Code attribute in non-native/non-abstract method
2865 if (_need_verify) {
2866 guarantee_property(access_flags.is_native() ||
2867 access_flags.is_abstract() ||
2868 parsed_code_attribute,
2869 "Absent Code attribute in method that is not native or abstract in class file %s",
2870 CHECK_NULL);
2871 }
2872
2873 // All sizing information for a Method* is finally available, now create it
2874 InlineTableSizes sizes(
2875 total_lvt_length,
2876 linenumber_table_length,
2877 exception_table_length,
2878 checked_exceptions_length,
2879 method_parameters_length,
2880 generic_signature_index,
2881 runtime_visible_annotations_length +
2882 runtime_invisible_annotations_length,
2883 runtime_visible_parameter_annotations_length +
2884 runtime_invisible_parameter_annotations_length,
2885 runtime_visible_type_annotations_length +
2886 runtime_invisible_type_annotations_length,
2887 annotation_default_length,
2888 0);
2889
2890 Method* const m = Method::allocate(_loader_data,
2891 code_length,
2892 access_flags,
2893 &sizes,
2894 ConstMethod::NORMAL,
2895 CHECK_NULL);
2896
2897 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2898
2899 // Fill in information from fixed part (access_flags already set)
2900 m->set_constants(_cp);
2901 m->set_name_index(name_index);
2902 m->set_signature_index(signature_index);
2903
2904 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2905 m->constMethod()->set_result_type(rtf.type());
2906
2907 if (args_size >= 0) {
2908 m->set_size_of_parameters(args_size);
2909 } else {
2910 m->compute_size_of_parameters(THREAD);
2911 }
2912 #ifdef ASSERT
2913 if (args_size >= 0) {
2914 m->compute_size_of_parameters(THREAD);
2915 assert(args_size == m->size_of_parameters(), "");
2916 }
2917 #endif
2918
2919 // Fill in code attribute information
2920 m->set_max_stack(max_stack);
2921 m->set_max_locals(max_locals);
2922 if (stackmap_data != NULL) {
2923 m->constMethod()->copy_stackmap_data(_loader_data,
2924 (u1*)stackmap_data,
2925 stackmap_data_length,
2926 CHECK_NULL);
2927 }
2928
2929 // Copy byte codes
2930 m->set_code((u1*)code_start);
2931
2932 // Copy line number table
2933 if (linenumber_table != NULL) {
2934 memcpy(m->compressed_linenumber_table(),
2935 linenumber_table->buffer(),
2936 linenumber_table_length);
2937 }
2938
2939 // Copy exception table
2940 if (exception_table_length > 0) {
2941 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2942 m->exception_table_start(),
2943 exception_table_length * sizeof(ExceptionTableElement),
2944 sizeof(u2));
2945 }
2946
2947 // Copy method parameters
2948 if (method_parameters_length > 0) {
2949 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2950 for (int i = 0; i < method_parameters_length; i++) {
2951 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2952 method_parameters_data += 2;
2953 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2954 method_parameters_data += 2;
2955 }
2956 }
2957
2958 // Copy checked exceptions
2959 if (checked_exceptions_length > 0) {
2960 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2961 m->checked_exceptions_start(),
2962 checked_exceptions_length * sizeof(CheckedExceptionElement),
2963 sizeof(u2));
2964 }
2965
2966 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2967 if (total_lvt_length > 0) {
2968 promoted_flags->set_has_localvariable_table();
2969 copy_localvariable_table(m->constMethod(),
2970 lvt_cnt,
2971 localvariable_table_length,
2972 localvariable_table_start,
2973 lvtt_cnt,
2974 localvariable_type_table_length,
2975 localvariable_type_table_start,
2976 CHECK_NULL);
2977 }
2978
2979 if (parsed_annotations.has_any_annotations())
2980 parsed_annotations.apply_to(m);
2981
2982 // Copy annotations
2983 copy_method_annotations(m->constMethod(),
2984 runtime_visible_annotations,
2985 runtime_visible_annotations_length,
2986 runtime_invisible_annotations,
2987 runtime_invisible_annotations_length,
2988 runtime_visible_parameter_annotations,
2989 runtime_visible_parameter_annotations_length,
2990 runtime_invisible_parameter_annotations,
2991 runtime_invisible_parameter_annotations_length,
2992 runtime_visible_type_annotations,
2993 runtime_visible_type_annotations_length,
2994 runtime_invisible_type_annotations,
2995 runtime_invisible_type_annotations_length,
2996 annotation_default,
2997 annotation_default_length,
2998 CHECK_NULL);
2999
3000 if (name == vmSymbols::finalize_method_name() &&
3001 signature == vmSymbols::void_method_signature()) {
3002 if (m->is_empty_method()) {
3003 _has_empty_finalizer = true;
3004 } else {
3005 _has_finalizer = true;
3006 }
3007 }
3008 if (name == vmSymbols::object_initializer_name() &&
3009 signature == vmSymbols::void_method_signature() &&
3010 m->is_vanilla_constructor()) {
3011 _has_vanilla_constructor = true;
3012 }
3013
3014 NOT_PRODUCT(m->verify());
3015 return m;
3016 }
3017
3018
3019 // The promoted_flags parameter is used to pass relevant access_flags
3020 // from the methods back up to the containing klass. These flag values
3021 // are added to klass's access_flags.
3022 // Side-effects: populates the _methods field in the parser
3023 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
3024 bool is_interface,
3025 bool is_value_type,
3026 AccessFlags* promoted_flags,
3027 bool* has_final_method,
3028 bool* declares_nonstatic_concrete_methods,
3029 TRAPS) {
3030 assert(cfs != NULL, "invariant");
3031 assert(promoted_flags != NULL, "invariant");
3032 assert(has_final_method != NULL, "invariant");
3033 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
3034
3035 assert(NULL == _methods, "invariant");
3036
3037 cfs->guarantee_more(2, CHECK); // length
3038 const u2 length = cfs->get_u2_fast();
3039 if (length == 0) {
3040 _methods = Universe::the_empty_method_array();
3041 } else {
3042 _methods = MetadataFactory::new_array<Method*>(_loader_data,
3043 length,
3044 NULL,
3045 CHECK);
3046
3047 for (int index = 0; index < length; index++) {
3048 Method* method = parse_method(cfs,
3049 is_interface,
3050 is_value_type,
3051 _cp,
3052 promoted_flags,
3053 CHECK);
3054
3055 if (method->is_final()) {
3056 *has_final_method = true;
3057 }
3058 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
3059 // used for interface initialization, and default method inheritance analysis
3060 if (is_interface && !(*declares_nonstatic_concrete_methods)
3061 && !method->is_abstract() && !method->is_static()) {
3062 *declares_nonstatic_concrete_methods = true;
3063 }
3064 _methods->at_put(index, method);
3065 }
3066
3067 if (_need_verify && length > 1) {
3068 // Check duplicated methods
3069 ResourceMark rm(THREAD);
3070 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
3071 THREAD, NameSigHash*, HASH_ROW_SIZE);
3072 initialize_hashtable(names_and_sigs);
3073 bool dup = false;
3074 const Symbol* name = NULL;
3075 const Symbol* sig = NULL;
3076 {
3077 debug_only(NoSafepointVerifier nsv;)
3078 for (int i = 0; i < length; i++) {
3079 const Method* const m = _methods->at(i);
3080 name = m->name();
3081 sig = m->signature();
3082 // If no duplicates, add name/signature in hashtable names_and_sigs.
3083 if (!put_after_lookup(name, sig, names_and_sigs)) {
3084 dup = true;
3085 break;
3086 }
3087 }
3088 }
3089 if (dup) {
3090 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
3091 name->as_C_string(), sig->as_klass_external_name(), CHECK);
3092 }
3093 }
3094 }
3095 }
3096
3097 static const intArray* sort_methods(Array<Method*>* methods) {
3098 const int length = methods->length();
3099 // If JVMTI original method ordering or sharing is enabled we have to
3100 // remember the original class file ordering.
3101 // We temporarily use the vtable_index field in the Method* to store the
3102 // class file index, so we can read in after calling qsort.
3103 // Put the method ordering in the shared archive.
3104 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3105 for (int index = 0; index < length; index++) {
3106 Method* const m = methods->at(index);
3107 assert(!m->valid_vtable_index(), "vtable index should not be set");
3108 m->set_vtable_index(index);
3109 }
3110 }
3111 // Sort method array by ascending method name (for faster lookups & vtable construction)
3112 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3113 Method::sort_methods(methods);
3114
3115 intArray* method_ordering = NULL;
3116 // If JVMTI original method ordering or sharing is enabled construct int
3117 // array remembering the original ordering
3118 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3119 method_ordering = new intArray(length, length, -1);
3120 for (int index = 0; index < length; index++) {
3121 Method* const m = methods->at(index);
3122 const int old_index = m->vtable_index();
3123 assert(old_index >= 0 && old_index < length, "invalid method index");
3124 method_ordering->at_put(index, old_index);
3125 m->set_vtable_index(Method::invalid_vtable_index);
3126 }
3127 }
3128 return method_ordering;
3129 }
3130
3131 // Parse generic_signature attribute for methods and fields
3132 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3133 TRAPS) {
3134 assert(cfs != NULL, "invariant");
3135
3136 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3137 const u2 generic_signature_index = cfs->get_u2_fast();
3138 check_property(
3139 valid_symbol_at(generic_signature_index),
3140 "Invalid Signature attribute at constant pool index %u in class file %s",
3141 generic_signature_index, CHECK_0);
3142 return generic_signature_index;
3143 }
3144
3145 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3146 TRAPS) {
3147
3148 assert(cfs != NULL, "invariant");
3149
3150 cfs->guarantee_more(2, CHECK); // sourcefile_index
3151 const u2 sourcefile_index = cfs->get_u2_fast();
3152 check_property(
3153 valid_symbol_at(sourcefile_index),
3154 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3155 sourcefile_index, CHECK);
3156 set_class_sourcefile_index(sourcefile_index);
3157 }
3158
3159 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3160 int length,
3161 TRAPS) {
3162 assert(cfs != NULL, "invariant");
3163
3164 const u1* const sde_buffer = cfs->current();
3165 assert(sde_buffer != NULL, "null sde buffer");
3166
3167 // Don't bother storing it if there is no way to retrieve it
3168 if (JvmtiExport::can_get_source_debug_extension()) {
3169 assert((length+1) > length, "Overflow checking");
3170 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3171 for (int i = 0; i < length; i++) {
3172 sde[i] = sde_buffer[i];
3173 }
3174 sde[length] = '\0';
3175 set_class_sde_buffer((const char*)sde, length);
3176 }
3177 // Got utf8 string, set stream position forward
3178 cfs->skip_u1(length, CHECK);
3179 }
3180
3181
3182 // Inner classes can be static, private or protected (classic VM does this)
3183 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3184 JVM_ACC_PRIVATE | \
3185 JVM_ACC_PROTECTED | \
3186 JVM_ACC_STATIC \
3187 )
3188
3189 // Return number of classes in the inner classes attribute table
3190 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3191 const u1* const inner_classes_attribute_start,
3192 bool parsed_enclosingmethod_attribute,
3193 u2 enclosing_method_class_index,
3194 u2 enclosing_method_method_index,
3195 TRAPS) {
3196 const u1* const current_mark = cfs->current();
3197 u2 length = 0;
3198 if (inner_classes_attribute_start != NULL) {
3199 cfs->set_current(inner_classes_attribute_start);
3200 cfs->guarantee_more(2, CHECK_0); // length
3201 length = cfs->get_u2_fast();
3202 }
3203
3204 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3205 // method data:
3206 // [inner_class_info_index,
3207 // outer_class_info_index,
3208 // inner_name_index,
3209 // inner_class_access_flags,
3210 // ...
3211 // enclosing_method_class_index,
3212 // enclosing_method_method_index]
3213 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3214 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3215 _inner_classes = inner_classes;
3216
3217 int index = 0;
3218 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3219 for (int n = 0; n < length; n++) {
3220 // Inner class index
3221 const u2 inner_class_info_index = cfs->get_u2_fast();
3222 check_property(
3223 valid_klass_reference_at(inner_class_info_index),
3224 "inner_class_info_index %u has bad constant type in class file %s",
3225 inner_class_info_index, CHECK_0);
3226 // Outer class index
3227 const u2 outer_class_info_index = cfs->get_u2_fast();
3228 check_property(
3229 outer_class_info_index == 0 ||
3230 valid_klass_reference_at(outer_class_info_index),
3231 "outer_class_info_index %u has bad constant type in class file %s",
3232 outer_class_info_index, CHECK_0);
3233 // Inner class name
3234 const u2 inner_name_index = cfs->get_u2_fast();
3235 check_property(
3236 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3237 "inner_name_index %u has bad constant type in class file %s",
3238 inner_name_index, CHECK_0);
3239 if (_need_verify) {
3240 guarantee_property(inner_class_info_index != outer_class_info_index,
3241 "Class is both outer and inner class in class file %s", CHECK_0);
3242 }
3243
3244 jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3245 // JVM_ACC_MODULE is defined in JDK-9 and later.
3246 if (_major_version >= JAVA_9_VERSION) {
3247 recognized_modifiers |= JVM_ACC_MODULE;
3248 }
3249 // JVM_ACC_VALUE is defined for class file version 55 and later
3250 if (supports_value_types()) {
3251 recognized_modifiers |= JVM_ACC_VALUE;
3252 }
3253
3254 // Access flags
3255 jint flags = cfs->get_u2_fast() & recognized_modifiers;
3256
3257 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3258 // Set abstract bit for old class files for backward compatibility
3259 flags |= JVM_ACC_ABSTRACT;
3260 }
3261 verify_legal_class_modifiers(flags, CHECK_0);
3262 AccessFlags inner_access_flags(flags);
3263
3264 inner_classes->at_put(index++, inner_class_info_index);
3265 inner_classes->at_put(index++, outer_class_info_index);
3266 inner_classes->at_put(index++, inner_name_index);
3267 inner_classes->at_put(index++, inner_access_flags.as_short());
3268 }
3269
3270 // 4347400: make sure there's no duplicate entry in the classes array
3271 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3272 for(int i = 0; i < length * 4; i += 4) {
3273 for(int j = i + 4; j < length * 4; j += 4) {
3274 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3275 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3276 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3277 inner_classes->at(i+3) != inner_classes->at(j+3)),
3278 "Duplicate entry in InnerClasses in class file %s",
3279 CHECK_0);
3280 }
3281 }
3282 }
3283
3284 // Set EnclosingMethod class and method indexes.
3285 if (parsed_enclosingmethod_attribute) {
3286 inner_classes->at_put(index++, enclosing_method_class_index);
3287 inner_classes->at_put(index++, enclosing_method_method_index);
3288 }
3289 assert(index == size, "wrong size");
3290
3291 // Restore buffer's current position.
3292 cfs->set_current(current_mark);
3293
3294 return length;
3295 }
3296
3297 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3298 const u1* const nest_members_attribute_start,
3299 TRAPS) {
3300 const u1* const current_mark = cfs->current();
3301 u2 length = 0;
3302 if (nest_members_attribute_start != NULL) {
3303 cfs->set_current(nest_members_attribute_start);
3304 cfs->guarantee_more(2, CHECK_0); // length
3305 length = cfs->get_u2_fast();
3306 }
3307 const int size = length;
3308 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3309 _nest_members = nest_members;
3310
3311 int index = 0;
3312 cfs->guarantee_more(2 * length, CHECK_0);
3313 for (int n = 0; n < length; n++) {
3314 const u2 class_info_index = cfs->get_u2_fast();
3315 check_property(
3316 valid_klass_reference_at(class_info_index),
3317 "Nest member class_info_index %u has bad constant type in class file %s",
3318 class_info_index, CHECK_0);
3319 nest_members->at_put(index++, class_info_index);
3320 }
3321 assert(index == size, "wrong size");
3322
3323 // Restore buffer's current position.
3324 cfs->set_current(current_mark);
3325
3326 return length;
3327 }
3328
3329 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3330 set_class_synthetic_flag(true);
3331 }
3332
3333 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3334 assert(cfs != NULL, "invariant");
3335
3336 const u2 signature_index = cfs->get_u2(CHECK);
3337 check_property(
3338 valid_symbol_at(signature_index),
3339 "Invalid constant pool index %u in Signature attribute in class file %s",
3340 signature_index, CHECK);
3341 set_class_generic_signature_index(signature_index);
3342 }
3343
3344 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3345 ConstantPool* cp,
3346 u4 attribute_byte_length,
3347 TRAPS) {
3348 assert(cfs != NULL, "invariant");
3349 assert(cp != NULL, "invariant");
3350
3351 const u1* const current_start = cfs->current();
3352
3353 guarantee_property(attribute_byte_length >= sizeof(u2),
3354 "Invalid BootstrapMethods attribute length %u in class file %s",
3355 attribute_byte_length,
3356 CHECK);
3357
3358 cfs->guarantee_more(attribute_byte_length, CHECK);
3359
3360 const int attribute_array_length = cfs->get_u2_fast();
3361
3362 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3363 "Short length on BootstrapMethods in class file %s",
3364 CHECK);
3365
3366
3367 // The attribute contains a counted array of counted tuples of shorts,
3368 // represending bootstrap specifiers:
3369 // length*{bootstrap_method_index, argument_count*{argument_index}}
3370 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3371 // operand_count = number of shorts in attr, except for leading length
3372
3373 // The attribute is copied into a short[] array.
3374 // The array begins with a series of short[2] pairs, one for each tuple.
3375 const int index_size = (attribute_array_length * 2);
3376
3377 Array<u2>* const operands =
3378 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3379
3380 // Eagerly assign operands so they will be deallocated with the constant
3381 // pool if there is an error.
3382 cp->set_operands(operands);
3383
3384 int operand_fill_index = index_size;
3385 const int cp_size = cp->length();
3386
3387 for (int n = 0; n < attribute_array_length; n++) {
3388 // Store a 32-bit offset into the header of the operand array.
3389 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3390
3391 // Read a bootstrap specifier.
3392 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3393 const u2 bootstrap_method_index = cfs->get_u2_fast();
3394 const u2 argument_count = cfs->get_u2_fast();
3395 check_property(
3396 valid_cp_range(bootstrap_method_index, cp_size) &&
3397 cp->tag_at(bootstrap_method_index).is_method_handle(),
3398 "bootstrap_method_index %u has bad constant type in class file %s",
3399 bootstrap_method_index,
3400 CHECK);
3401
3402 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3403 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3404 CHECK);
3405
3406 operands->at_put(operand_fill_index++, bootstrap_method_index);
3407 operands->at_put(operand_fill_index++, argument_count);
3408
3409 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3410 for (int j = 0; j < argument_count; j++) {
3411 const u2 argument_index = cfs->get_u2_fast();
3412 check_property(
3413 valid_cp_range(argument_index, cp_size) &&
3414 cp->tag_at(argument_index).is_loadable_constant(),
3415 "argument_index %u has bad constant type in class file %s",
3416 argument_index,
3417 CHECK);
3418 operands->at_put(operand_fill_index++, argument_index);
3419 }
3420 }
3421 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3422 "Bad length on BootstrapMethods in class file %s",
3423 CHECK);
3424 }
3425
3426 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3427 ConstantPool* cp,
3428 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3429 TRAPS) {
3430 assert(cfs != NULL, "invariant");
3431 assert(cp != NULL, "invariant");
3432 assert(parsed_annotations != NULL, "invariant");
3433
3434 // Set inner classes attribute to default sentinel
3435 _inner_classes = Universe::the_empty_short_array();
3436 // Set nest members attribute to default sentinel
3437 _nest_members = Universe::the_empty_short_array();
3438 cfs->guarantee_more(2, CHECK); // attributes_count
3439 u2 attributes_count = cfs->get_u2_fast();
3440 bool parsed_sourcefile_attribute = false;
3441 bool parsed_innerclasses_attribute = false;
3442 bool parsed_nest_members_attribute = false;
3443 bool parsed_nest_host_attribute = false;
3444 bool parsed_enclosingmethod_attribute = false;
3445 bool parsed_bootstrap_methods_attribute = false;
3446 const u1* runtime_visible_annotations = NULL;
3447 int runtime_visible_annotations_length = 0;
3448 const u1* runtime_invisible_annotations = NULL;
3449 int runtime_invisible_annotations_length = 0;
3450 const u1* runtime_visible_type_annotations = NULL;
3451 int runtime_visible_type_annotations_length = 0;
3452 const u1* runtime_invisible_type_annotations = NULL;
3453 int runtime_invisible_type_annotations_length = 0;
3454 bool runtime_invisible_type_annotations_exists = false;
3455 bool runtime_invisible_annotations_exists = false;
3456 bool parsed_source_debug_ext_annotations_exist = false;
3457 const u1* inner_classes_attribute_start = NULL;
3458 u4 inner_classes_attribute_length = 0;
3459 const u1* value_types_attribute_start = NULL;
3460 u4 value_types_attribute_length = 0;
3461 u2 enclosing_method_class_index = 0;
3462 u2 enclosing_method_method_index = 0;
3463 const u1* nest_members_attribute_start = NULL;
3464 u4 nest_members_attribute_length = 0;
3465
3466 // Iterate over attributes
3467 while (attributes_count--) {
3468 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3469 const u2 attribute_name_index = cfs->get_u2_fast();
3470 const u4 attribute_length = cfs->get_u4_fast();
3471 check_property(
3472 valid_symbol_at(attribute_name_index),
3473 "Attribute name has bad constant pool index %u in class file %s",
3474 attribute_name_index, CHECK);
3475 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3476 if (tag == vmSymbols::tag_source_file()) {
3477 // Check for SourceFile tag
3478 if (_need_verify) {
3479 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3480 }
3481 if (parsed_sourcefile_attribute) {
3482 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3483 } else {
3484 parsed_sourcefile_attribute = true;
3485 }
3486 parse_classfile_sourcefile_attribute(cfs, CHECK);
3487 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3488 // Check for SourceDebugExtension tag
3489 if (parsed_source_debug_ext_annotations_exist) {
3490 classfile_parse_error(
3491 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3492 }
3493 parsed_source_debug_ext_annotations_exist = true;
3494 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3495 } else if (tag == vmSymbols::tag_inner_classes()) {
3496 // Check for InnerClasses tag
3497 if (parsed_innerclasses_attribute) {
3498 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3499 } else {
3500 parsed_innerclasses_attribute = true;
3501 }
3502 inner_classes_attribute_start = cfs->current();
3503 inner_classes_attribute_length = attribute_length;
3504 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3505 } else if (tag == vmSymbols::tag_synthetic()) {
3506 // Check for Synthetic tag
3507 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3508 if (attribute_length != 0) {
3509 classfile_parse_error(
3510 "Invalid Synthetic classfile attribute length %u in class file %s",
3511 attribute_length, CHECK);
3512 }
3513 parse_classfile_synthetic_attribute(CHECK);
3514 } else if (tag == vmSymbols::tag_deprecated()) {
3515 // Check for Deprecatd tag - 4276120
3516 if (attribute_length != 0) {
3517 classfile_parse_error(
3518 "Invalid Deprecated classfile attribute length %u in class file %s",
3519 attribute_length, CHECK);
3520 }
3521 } else if (_major_version >= JAVA_1_5_VERSION) {
3522 if (tag == vmSymbols::tag_signature()) {
3523 if (_generic_signature_index != 0) {
3524 classfile_parse_error(
3525 "Multiple Signature attributes in class file %s", CHECK);
3526 }
3527 if (attribute_length != 2) {
3528 classfile_parse_error(
3529 "Wrong Signature attribute length %u in class file %s",
3530 attribute_length, CHECK);
3531 }
3532 parse_classfile_signature_attribute(cfs, CHECK);
3533 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3534 if (runtime_visible_annotations != NULL) {
3535 classfile_parse_error(
3536 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3537 }
3538 runtime_visible_annotations_length = attribute_length;
3539 runtime_visible_annotations = cfs->current();
3540 assert(runtime_visible_annotations != NULL, "null visible annotations");
3541 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3542 parse_annotations(cp,
3543 runtime_visible_annotations,
3544 runtime_visible_annotations_length,
3545 parsed_annotations,
3546 _loader_data,
3547 CHECK);
3548 cfs->skip_u1_fast(runtime_visible_annotations_length);
3549 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3550 if (runtime_invisible_annotations_exists) {
3551 classfile_parse_error(
3552 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3553 }
3554 runtime_invisible_annotations_exists = true;
3555 if (PreserveAllAnnotations) {
3556 runtime_invisible_annotations_length = attribute_length;
3557 runtime_invisible_annotations = cfs->current();
3558 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3559 }
3560 cfs->skip_u1(attribute_length, CHECK);
3561 } else if (tag == vmSymbols::tag_enclosing_method()) {
3562 if (parsed_enclosingmethod_attribute) {
3563 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3564 } else {
3565 parsed_enclosingmethod_attribute = true;
3566 }
3567 guarantee_property(attribute_length == 4,
3568 "Wrong EnclosingMethod attribute length %u in class file %s",
3569 attribute_length, CHECK);
3570 cfs->guarantee_more(4, CHECK); // class_index, method_index
3571 enclosing_method_class_index = cfs->get_u2_fast();
3572 enclosing_method_method_index = cfs->get_u2_fast();
3573 if (enclosing_method_class_index == 0) {
3574 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3575 }
3576 // Validate the constant pool indices and types
3577 check_property(valid_klass_reference_at(enclosing_method_class_index),
3578 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3579 if (enclosing_method_method_index != 0 &&
3580 (!cp->is_within_bounds(enclosing_method_method_index) ||
3581 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3582 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3583 }
3584 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3585 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3586 if (parsed_bootstrap_methods_attribute) {
3587 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3588 }
3589 parsed_bootstrap_methods_attribute = true;
3590 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3591 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3592 if (runtime_visible_type_annotations != NULL) {
3593 classfile_parse_error(
3594 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3595 }
3596 runtime_visible_type_annotations_length = attribute_length;
3597 runtime_visible_type_annotations = cfs->current();
3598 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3599 // No need for the VM to parse Type annotations
3600 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3601 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3602 if (runtime_invisible_type_annotations_exists) {
3603 classfile_parse_error(
3604 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3605 } else {
3606 runtime_invisible_type_annotations_exists = true;
3607 }
3608 if (PreserveAllAnnotations) {
3609 runtime_invisible_type_annotations_length = attribute_length;
3610 runtime_invisible_type_annotations = cfs->current();
3611 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3612 }
3613 cfs->skip_u1(attribute_length, CHECK);
3614 } else if (_major_version >= JAVA_11_VERSION) {
3615 if (tag == vmSymbols::tag_nest_members()) {
3616 // Check for NestMembers tag
3617 if (parsed_nest_members_attribute) {
3618 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK);
3619 } else {
3620 parsed_nest_members_attribute = true;
3621 }
3622 if (parsed_nest_host_attribute) {
3623 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK);
3624 }
3625 nest_members_attribute_start = cfs->current();
3626 nest_members_attribute_length = attribute_length;
3627 cfs->skip_u1(nest_members_attribute_length, CHECK);
3628 } else if (tag == vmSymbols::tag_nest_host()) {
3629 if (parsed_nest_host_attribute) {
3630 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK);
3631 } else {
3632 parsed_nest_host_attribute = true;
3633 }
3634 if (parsed_nest_members_attribute) {
3635 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK);
3636 }
3637 if (_need_verify) {
3638 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3639 }
3640 cfs->guarantee_more(2, CHECK);
3641 u2 class_info_index = cfs->get_u2_fast();
3642 check_property(
3643 valid_klass_reference_at(class_info_index),
3644 "Nest-host class_info_index %u has bad constant type in class file %s",
3645 class_info_index, CHECK);
3646 _nest_host = class_info_index;
3647 } else {
3648 // Unknown attribute
3649 cfs->skip_u1(attribute_length, CHECK);
3650 }
3651 } else {
3652 // Unknown attribute
3653 cfs->skip_u1(attribute_length, CHECK);
3654 }
3655 } else {
3656 // Unknown attribute
3657 cfs->skip_u1(attribute_length, CHECK);
3658 }
3659 }
3660 _annotations = assemble_annotations(runtime_visible_annotations,
3661 runtime_visible_annotations_length,
3662 runtime_invisible_annotations,
3663 runtime_invisible_annotations_length,
3664 CHECK);
3665 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3666 runtime_visible_type_annotations_length,
3667 runtime_invisible_type_annotations,
3668 runtime_invisible_type_annotations_length,
3669 CHECK);
3670
3671 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3672 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3673 cfs,
3674 inner_classes_attribute_start,
3675 parsed_innerclasses_attribute,
3676 enclosing_method_class_index,
3677 enclosing_method_method_index,
3678 CHECK);
3679 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3680 guarantee_property(
3681 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3682 "Wrong InnerClasses attribute length in class file %s", CHECK);
3683 }
3684 }
3685
3686 if (parsed_nest_members_attribute) {
3687 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3688 cfs,
3689 nest_members_attribute_start,
3690 CHECK);
3691 if (_need_verify) {
3692 guarantee_property(
3693 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3694 "Wrong NestMembers attribute length in class file %s", CHECK);
3695 }
3696 }
3697
3698 if (_max_bootstrap_specifier_index >= 0) {
3699 guarantee_property(parsed_bootstrap_methods_attribute,
3700 "Missing BootstrapMethods attribute in class file %s", CHECK);
3701 }
3702 }
3703
3704 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3705 assert(k != NULL, "invariant");
3706
3707 if (_synthetic_flag)
3708 k->set_is_synthetic();
3709 if (_sourcefile_index != 0) {
3710 k->set_source_file_name_index(_sourcefile_index);
3711 }
3712 if (_generic_signature_index != 0) {
3713 k->set_generic_signature_index(_generic_signature_index);
3714 }
3715 if (_sde_buffer != NULL) {
3716 k->set_source_debug_extension(_sde_buffer, _sde_length);
3717 }
3718 }
3719
3720 // Create the Annotations object that will
3721 // hold the annotations array for the Klass.
3722 void ClassFileParser::create_combined_annotations(TRAPS) {
3723 if (_annotations == NULL &&
3724 _type_annotations == NULL &&
3725 _fields_annotations == NULL &&
3726 _fields_type_annotations == NULL) {
3727 // Don't create the Annotations object unnecessarily.
3728 return;
3729 }
3730
3731 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3732 annotations->set_class_annotations(_annotations);
3733 annotations->set_class_type_annotations(_type_annotations);
3734 annotations->set_fields_annotations(_fields_annotations);
3735 annotations->set_fields_type_annotations(_fields_type_annotations);
3736
3737 // This is the Annotations object that will be
3738 // assigned to InstanceKlass being constructed.
3739 _combined_annotations = annotations;
3740
3741 // The annotations arrays below has been transfered the
3742 // _combined_annotations so these fields can now be cleared.
3743 _annotations = NULL;
3744 _type_annotations = NULL;
3745 _fields_annotations = NULL;
3746 _fields_type_annotations = NULL;
3747 }
3748
3749 // Transfer ownership of metadata allocated to the InstanceKlass.
3750 void ClassFileParser::apply_parsed_class_metadata(
3751 InstanceKlass* this_klass,
3752 int java_fields_count, TRAPS) {
3753 assert(this_klass != NULL, "invariant");
3754
3755 _cp->set_pool_holder(this_klass);
3756 this_klass->set_constants(_cp);
3757 this_klass->set_fields(_fields, java_fields_count);
3758 this_klass->set_methods(_methods);
3759 this_klass->set_inner_classes(_inner_classes);
3760 this_klass->set_nest_members(_nest_members);
3761 this_klass->set_nest_host_index(_nest_host);
3762 this_klass->set_local_interfaces(_local_interfaces);
3763 this_klass->set_annotations(_combined_annotations);
3764 // Delay the setting of _transitive_interfaces until after initialize_supers() in
3765 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with
3766 // its _super. If an OOM occurs while loading the current klass, its _super field
3767 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3768 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3769 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3770
3771 // Clear out these fields so they don't get deallocated by the destructor
3772 clear_class_metadata();
3773 }
3774
3775 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3776 int runtime_visible_annotations_length,
3777 const u1* const runtime_invisible_annotations,
3778 int runtime_invisible_annotations_length,
3779 TRAPS) {
3780 AnnotationArray* annotations = NULL;
3781 if (runtime_visible_annotations != NULL ||
3782 runtime_invisible_annotations != NULL) {
3783 annotations = MetadataFactory::new_array<u1>(_loader_data,
3784 runtime_visible_annotations_length +
3785 runtime_invisible_annotations_length,
3786 CHECK_(annotations));
3787 if (runtime_visible_annotations != NULL) {
3788 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3789 annotations->at_put(i, runtime_visible_annotations[i]);
3790 }
3791 }
3792 if (runtime_invisible_annotations != NULL) {
3793 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3794 int append = runtime_visible_annotations_length+i;
3795 annotations->at_put(append, runtime_invisible_annotations[i]);
3796 }
3797 }
3798 }
3799 return annotations;
3800 }
3801
3802 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3803 const int super_class_index,
3804 const bool need_verify,
3805 TRAPS) {
3806 assert(cp != NULL, "invariant");
3807 const InstanceKlass* super_klass = NULL;
3808
3809 if (super_class_index == 0) {
3810 check_property(_class_name == vmSymbols::java_lang_Object()
3811 || (_access_flags.get_flags() & JVM_ACC_VALUE),
3812 "Invalid superclass index %u in class file %s",
3813 super_class_index,
3814 CHECK_NULL);
3815 } else {
3816 check_property(valid_klass_reference_at(super_class_index),
3817 "Invalid superclass index %u in class file %s",
3818 super_class_index,
3819 CHECK_NULL);
3820 // The class name should be legal because it is checked when parsing constant pool.
3821 // However, make sure it is not an array type.
3822 bool is_array = false;
3823 if (cp->tag_at(super_class_index).is_klass()) {
3824 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3825 if (need_verify)
3826 is_array = super_klass->is_array_klass();
3827 } else if (need_verify) {
3828 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3829 }
3830 if (need_verify) {
3831 guarantee_property(!is_array,
3832 "Bad superclass name in class file %s", CHECK_NULL);
3833 }
3834 }
3835 return super_klass;
3836 }
3837
3838 #ifndef PRODUCT
3839 static void print_field_layout(const Symbol* name,
3840 Array<u2>* fields,
3841 const constantPoolHandle& cp,
3842 int instance_size,
3843 int instance_fields_start,
3844 int instance_fields_end,
3845 int static_fields_end) {
3846
3847 assert(name != NULL, "invariant");
3848
3849 tty->print("%s: field layout\n", name->as_klass_external_name());
3850 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3851 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3852 if (!fs.access_flags().is_static()) {
3853 tty->print(" @%3d \"%s\" %s\n",
3854 fs.offset(),
3855 fs.name()->as_klass_external_name(),
3856 fs.signature()->as_klass_external_name());
3857 }
3858 }
3859 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3860 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3861 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3862 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3863 if (fs.access_flags().is_static()) {
3864 tty->print(" @%3d \"%s\" %s\n",
3865 fs.offset(),
3866 fs.name()->as_klass_external_name(),
3867 fs.signature()->as_klass_external_name());
3868 }
3869 }
3870 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3871 tty->print("\n");
3872 }
3873 #endif
3874
3875 // Values needed for oopmap and InstanceKlass creation
3876 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3877 public:
3878 OopMapBlocksBuilder* oop_map_blocks;
3879 int instance_size;
3880 int nonstatic_field_size;
3881 int static_field_size;
3882 bool has_nonstatic_fields;
3883 };
3884
3885 // Utility to collect and compact oop maps during layout
3886 class ClassFileParser::OopMapBlocksBuilder : public ResourceObj {
3887 public:
3888 OopMapBlock* nonstatic_oop_maps;
3889 unsigned int nonstatic_oop_map_count;
3890 unsigned int max_nonstatic_oop_maps;
3891
3892 public:
3893 OopMapBlocksBuilder(unsigned int max_blocks, TRAPS) {
3894 max_nonstatic_oop_maps = max_blocks;
3895 nonstatic_oop_map_count = 0;
3896 if (max_blocks == 0) {
3897 nonstatic_oop_maps = NULL;
3898 } else {
3899 nonstatic_oop_maps = NEW_RESOURCE_ARRAY_IN_THREAD(
3900 THREAD, OopMapBlock, max_nonstatic_oop_maps);
3901 memset(nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3902 }
3903 }
3904
3905 OopMapBlock* last_oop_map() const {
3906 assert(nonstatic_oop_map_count > 0, "Has no oop maps");
3907 return nonstatic_oop_maps + (nonstatic_oop_map_count - 1);
3908 }
3909
3910 // addition of super oop maps
3911 void initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3912 assert(nof_blocks && nonstatic_oop_map_count == 0 &&
3913 nof_blocks <= max_nonstatic_oop_maps, "invariant");
3914
3915 memcpy(nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3916 nonstatic_oop_map_count += nof_blocks;
3917 }
3918
3919 // collection of oops
3920 void add(int offset, int count) {
3921 if (nonstatic_oop_map_count == 0) {
3922 nonstatic_oop_map_count++;
3923 }
3924 OopMapBlock* nonstatic_oop_map = last_oop_map();
3925 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
3926 nonstatic_oop_map->set_offset(offset);
3927 nonstatic_oop_map->set_count(count);
3928 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
3929 nonstatic_oop_map->increment_count(count);
3930 } else { // Need a new one...
3931 nonstatic_oop_map_count++;
3932 assert(nonstatic_oop_map_count <= max_nonstatic_oop_maps, "range check");
3933 nonstatic_oop_map = last_oop_map();
3934 nonstatic_oop_map->set_offset(offset);
3935 nonstatic_oop_map->set_count(count);
3936 }
3937 }
3938
3939 // general purpose copy, e.g. into allocated instanceKlass
3940 void copy(OopMapBlock* dst) {
3941 if (nonstatic_oop_map_count != 0) {
3942 memcpy(dst, nonstatic_oop_maps, sizeof(OopMapBlock) * nonstatic_oop_map_count);
3943 }
3944 }
3945
3946 // Sort and compact adjacent blocks
3947 void compact(TRAPS) {
3948 if (nonstatic_oop_map_count <= 1) {
3949 return;
3950 }
3951 /*
3952 * Since field layout sneeks in oops before values, we will be able to condense
3953 * blocks. There is potential to compact between super, own refs and values
3954 * containing refs.
3955 *
3956 * Currently compaction is slightly limited due to values being 8 byte aligned.
3957 * This may well change: FixMe if doesn't, the code below is fairly general purpose
3958 * and maybe it doesn't need to be.
3959 */
3960 qsort(nonstatic_oop_maps, nonstatic_oop_map_count, sizeof(OopMapBlock),
3961 (_sort_Fn)OopMapBlock::compare_offset);
3962 if (nonstatic_oop_map_count < 2) {
3963 return;
3964 }
3965
3966 //Make a temp copy, and iterate through and copy back into the orig
3967 ResourceMark rm(THREAD);
3968 OopMapBlock* oop_maps_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, OopMapBlock,
3969 nonstatic_oop_map_count);
3970 OopMapBlock* oop_maps_copy_end = oop_maps_copy + nonstatic_oop_map_count;
3971 copy(oop_maps_copy);
3972 OopMapBlock* nonstatic_oop_map = nonstatic_oop_maps;
3973 unsigned int new_count = 1;
3974 oop_maps_copy++;
3975 while(oop_maps_copy < oop_maps_copy_end) {
3976 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
3977 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
3978 nonstatic_oop_map->increment_count(oop_maps_copy->count());
3979 } else {
3980 nonstatic_oop_map++;
3981 new_count++;
3982 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
3983 nonstatic_oop_map->set_count(oop_maps_copy->count());
3984 }
3985 oop_maps_copy++;
3986 }
3987 assert(new_count <= nonstatic_oop_map_count, "end up with more maps after compact() ?");
3988 nonstatic_oop_map_count = new_count;
3989 }
3990
3991 void print_on(outputStream* st) const {
3992 st->print_cr(" OopMapBlocks: %3d /%3d", nonstatic_oop_map_count, max_nonstatic_oop_maps);
3993 if (nonstatic_oop_map_count > 0) {
3994 OopMapBlock* map = nonstatic_oop_maps;
3995 OopMapBlock* last_map = last_oop_map();
3996 assert(map <= last_map, "Last less than first");
3997 while (map <= last_map) {
3998 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
3999 map->offset() + map->offset_span() - heapOopSize, map->count());
4000 map++;
4001 }
4002 }
4003 }
4004
4005 void print_value_on(outputStream* st) const {
4006 print_on(st);
4007 }
4008
4009 };
4010
4011 void ClassFileParser::throwValueTypeLimitation(THREAD_AND_LOCATION_DECL,
4012 const char* msg,
4013 const Symbol* name,
4014 const Symbol* sig) const {
4015
4016 ResourceMark rm(THREAD);
4017 if (name == NULL || sig == NULL) {
4018 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
4019 vmSymbols::java_lang_ClassFormatError(),
4020 "class: %s - %s", _class_name->as_C_string(), msg);
4021 }
4022 else {
4023 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
4024 vmSymbols::java_lang_ClassFormatError(),
4025 "\"%s\" sig: \"%s\" class: %s - %s", name->as_C_string(), sig->as_C_string(),
4026 _class_name->as_C_string(), msg);
4027 }
4028 }
4029
4030 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
4031 void ClassFileParser::layout_fields(ConstantPool* cp,
4032 const FieldAllocationCount* fac,
4033 const ClassAnnotationCollector* parsed_annotations,
4034 FieldLayoutInfo* info,
4035 TRAPS) {
4036
4037 assert(cp != NULL, "invariant");
4038
4039 // Field size and offset computation
4040 int nonstatic_field_size = _super_klass == NULL ? 0 :
4041 _super_klass->nonstatic_field_size();
4042 int next_nonstatic_valuetype_offset = 0;
4043 int first_nonstatic_valuetype_offset = 0;
4044
4045 // Fields that are value types are handled differently depending if they are static or not:
4046 // - static fields are oops
4047 // - non-static fields are embedded
4048
4049 // Count the contended fields by type.
4050 //
4051 // We ignore static fields, because @Contended is not supported for them.
4052 // The layout code below will also ignore the static fields.
4053 int nonstatic_contended_count = 0;
4054 FieldAllocationCount fac_contended;
4055 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4056 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4057 if (fs.is_contended()) {
4058 fac_contended.count[atype]++;
4059 if (!fs.access_flags().is_static()) {
4060 nonstatic_contended_count++;
4061 }
4062 }
4063 }
4064
4065
4066 // Calculate the starting byte offsets
4067 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
4068 // Value types in static fields are not embedded, they are handled with oops
4069 int next_static_double_offset = next_static_oop_offset +
4070 ((fac->count[STATIC_OOP] + fac->count[STATIC_FLATTENABLE]) * heapOopSize);
4071 if (fac->count[STATIC_DOUBLE]) {
4072 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
4073 }
4074
4075 int next_static_word_offset = next_static_double_offset +
4076 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
4077 int next_static_short_offset = next_static_word_offset +
4078 ((fac->count[STATIC_WORD]) * BytesPerInt);
4079 int next_static_byte_offset = next_static_short_offset +
4080 ((fac->count[STATIC_SHORT]) * BytesPerShort);
4081
4082 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
4083 nonstatic_field_size * heapOopSize;
4084
4085 // First field of value types is aligned on a long boundary in order to ease
4086 // in-lining of value types (with header removal) in packed arrays and
4087 // flatten value types
4088 int initial_value_type_padding = 0;
4089 if (is_value_type()) {
4090 int old = nonstatic_fields_start;
4091 nonstatic_fields_start = align_up(nonstatic_fields_start, BytesPerLong);
4092 initial_value_type_padding = nonstatic_fields_start - old;
4093 }
4094
4095 int next_nonstatic_field_offset = nonstatic_fields_start;
4096
4097 const bool is_contended_class = parsed_annotations->is_contended();
4098
4099 // Class is contended, pad before all the fields
4100 if (is_contended_class) {
4101 next_nonstatic_field_offset += ContendedPaddingWidth;
4102 }
4103
4104 // Temporary value types restrictions
4105 if (is_value_type()) {
4106 if (is_contended_class) {
4107 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support @Contended annotation yet");
4108 return;
4109 }
4110 }
4111
4112 // Compute the non-contended fields count.
4113 // The packing code below relies on these counts to determine if some field
4114 // can be squeezed into the alignment gap. Contended fields are obviously
4115 // exempt from that.
4116 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
4117 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
4118 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
4119 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
4120 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
4121
4122 int static_value_type_count = 0;
4123 int nonstatic_value_type_count = 0;
4124 int* nonstatic_value_type_indexes = NULL;
4125 Klass** nonstatic_value_type_klasses = NULL;
4126 unsigned int value_type_oop_map_count = 0;
4127 int not_flattened_value_types = 0;
4128
4129 int max_nonstatic_value_type = fac->count[NONSTATIC_FLATTENABLE] + 1;
4130
4131 nonstatic_value_type_indexes = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, int,
4132 max_nonstatic_value_type);
4133 for (int i = 0; i < max_nonstatic_value_type; i++) {
4134 nonstatic_value_type_indexes[i] = -1;
4135 }
4136 nonstatic_value_type_klasses = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, Klass*,
4137 max_nonstatic_value_type);
4138
4139 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
4140 if (fs.allocation_type() == STATIC_FLATTENABLE) {
4141 // Pre-resolve the flattenable field and check for value type circularity
4142 // issues. Note that super-class circularity checks are not needed here
4143 // because flattenable fields can only be in value types and value types
4144 // only have java.lang.Object as their super class.
4145 // Also, note that super-interface circularity checks are not needed
4146 // because interfaces cannot be value types.
4147 ResourceMark rm;
4148 if (!fs.signature()->is_Q_signature()) {
4149 THROW(vmSymbols::java_lang_ClassFormatError());
4150 }
4151 Klass* klass =
4152 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4153 Handle(THREAD, _loader_data->class_loader()),
4154 _protection_domain, true, CHECK);
4155 assert(klass != NULL, "Sanity check");
4156 if (!klass->access_flags().is_value_type()) {
4157 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4158 }
4159 static_value_type_count++;
4160 } else if (fs.allocation_type() == NONSTATIC_FLATTENABLE) {
4161 // Pre-resolve the flattenable field and check for value type circularity issues.
4162 ResourceMark rm;
4163 if (!fs.signature()->is_Q_signature()) {
4164 THROW(vmSymbols::java_lang_ClassFormatError());
4165 }
4166 Klass* klass =
4167 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4168 Handle(THREAD, _loader_data->class_loader()),
4169 _protection_domain, true, CHECK);
4170 assert(klass != NULL, "Sanity check");
4171 if (!klass->access_flags().is_value_type()) {
4172 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4173 }
4174 ValueKlass* vk = ValueKlass::cast(klass);
4175 // Conditions to apply flattening or not should be defined in a single place
4176 if ((ValueFieldMaxFlatSize < 0) || (vk->size_helper() * HeapWordSize) <= ValueFieldMaxFlatSize) {
4177 nonstatic_value_type_indexes[nonstatic_value_type_count] = fs.index();
4178 nonstatic_value_type_klasses[nonstatic_value_type_count] = klass;
4179 nonstatic_value_type_count++;
4180
4181 ValueKlass* vklass = ValueKlass::cast(klass);
4182 if (vklass->contains_oops()) {
4183 value_type_oop_map_count += vklass->nonstatic_oop_map_count();
4184 }
4185 fs.set_flattened(true);
4186 } else {
4187 not_flattened_value_types++;
4188 fs.set_flattened(false);
4189 }
4190 }
4191 }
4192
4193 // Adjusting non_static_oop_count to take into account not flattened value types;
4194 nonstatic_oop_count += not_flattened_value_types;
4195
4196 // Total non-static fields count, including every contended field
4197 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
4198 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
4199 fac->count[NONSTATIC_OOP] + fac->count[NONSTATIC_FLATTENABLE];
4200
4201 const bool super_has_nonstatic_fields =
4202 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
4203 const bool has_nonstatic_fields =
4204 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
4205 const bool has_nonstatic_value_fields = nonstatic_value_type_count > 0;
4206
4207 if (is_value_type() && (!has_nonstatic_fields)) {
4208 // There are a number of fixes required throughout the type system and JIT
4209 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support zero instance size yet");
4210 return;
4211 }
4212
4213 // Prepare list of oops for oop map generation.
4214 //
4215 // "offset" and "count" lists are describing the set of contiguous oop
4216 // regions. offset[i] is the start of the i-th region, which then has
4217 // count[i] oops following. Before we know how many regions are required,
4218 // we pessimistically allocate the maps to fit all the oops into the
4219 // distinct regions.
4220 //
4221 int super_oop_map_count = (_super_klass == NULL) ? 0 :_super_klass->nonstatic_oop_map_count();
4222 int max_oop_map_count =
4223 super_oop_map_count +
4224 fac->count[NONSTATIC_OOP] +
4225 value_type_oop_map_count +
4226 not_flattened_value_types;
4227
4228 OopMapBlocksBuilder* nonstatic_oop_maps = new OopMapBlocksBuilder(max_oop_map_count, THREAD);
4229 if (super_oop_map_count > 0) {
4230 nonstatic_oop_maps->initialize_inherited_blocks(_super_klass->start_of_nonstatic_oop_maps(),
4231 _super_klass->nonstatic_oop_map_count());
4232 }
4233
4234 int first_nonstatic_oop_offset = 0; // will be set for first oop field
4235
4236 bool compact_fields = CompactFields;
4237 int allocation_style = FieldsAllocationStyle;
4238 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
4239 assert(false, "0 <= FieldsAllocationStyle <= 2");
4240 allocation_style = 1; // Optimistic
4241 }
4242
4243 // The next classes have predefined hard-coded fields offsets
4244 // (see in JavaClasses::compute_hard_coded_offsets()).
4245 // Use default fields allocation order for them.
4246 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
4247 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
4248 _class_name == vmSymbols::java_lang_Class() ||
4249 _class_name == vmSymbols::java_lang_ClassLoader() ||
4250 _class_name == vmSymbols::java_lang_ref_Reference() ||
4251 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
4252 _class_name == vmSymbols::java_lang_StackTraceElement() ||
4253 _class_name == vmSymbols::java_lang_String() ||
4254 _class_name == vmSymbols::java_lang_Throwable() ||
4255 _class_name == vmSymbols::java_lang_Boolean() ||
4256 _class_name == vmSymbols::java_lang_Character() ||
4257 _class_name == vmSymbols::java_lang_Float() ||
4258 _class_name == vmSymbols::java_lang_Double() ||
4259 _class_name == vmSymbols::java_lang_Byte() ||
4260 _class_name == vmSymbols::java_lang_Short() ||
4261 _class_name == vmSymbols::java_lang_Integer() ||
4262 _class_name == vmSymbols::java_lang_Long())) {
4263 allocation_style = 0; // Allocate oops first
4264 compact_fields = false; // Don't compact fields
4265 }
4266
4267 int next_nonstatic_oop_offset = 0;
4268 int next_nonstatic_double_offset = 0;
4269
4270 // Rearrange fields for a given allocation style
4271 if( allocation_style == 0 ) {
4272 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
4273 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4274 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4275 (nonstatic_oop_count * heapOopSize);
4276 } else if( allocation_style == 1 ) {
4277 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
4278 next_nonstatic_double_offset = next_nonstatic_field_offset;
4279 } else if( allocation_style == 2 ) {
4280 // Fields allocation: oops fields in super and sub classes are together.
4281 if( nonstatic_field_size > 0 && super_oop_map_count > 0 ) {
4282 if (next_nonstatic_field_offset == nonstatic_oop_maps->last_oop_map()->end_offset()) {
4283 allocation_style = 0; // allocate oops first
4284 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4285 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4286 (nonstatic_oop_count * heapOopSize);
4287 }
4288 }
4289 if( allocation_style == 2 ) {
4290 allocation_style = 1; // allocate oops last
4291 next_nonstatic_double_offset = next_nonstatic_field_offset;
4292 }
4293 } else {
4294 ShouldNotReachHere();
4295 }
4296
4297 int nonstatic_oop_space_count = 0;
4298 int nonstatic_word_space_count = 0;
4299 int nonstatic_short_space_count = 0;
4300 int nonstatic_byte_space_count = 0;
4301 int nonstatic_oop_space_offset = 0;
4302 int nonstatic_word_space_offset = 0;
4303 int nonstatic_short_space_offset = 0;
4304 int nonstatic_byte_space_offset = 0;
4305
4306 // Try to squeeze some of the fields into the gaps due to
4307 // long/double alignment.
4308 if (nonstatic_double_count > 0) {
4309 int offset = next_nonstatic_double_offset;
4310 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
4311 if (compact_fields && offset != next_nonstatic_double_offset) {
4312 // Allocate available fields into the gap before double field.
4313 int length = next_nonstatic_double_offset - offset;
4314 assert(length == BytesPerInt, "");
4315 nonstatic_word_space_offset = offset;
4316 if (nonstatic_word_count > 0) {
4317 nonstatic_word_count -= 1;
4318 nonstatic_word_space_count = 1; // Only one will fit
4319 length -= BytesPerInt;
4320 offset += BytesPerInt;
4321 }
4322 nonstatic_short_space_offset = offset;
4323 while (length >= BytesPerShort && nonstatic_short_count > 0) {
4324 nonstatic_short_count -= 1;
4325 nonstatic_short_space_count += 1;
4326 length -= BytesPerShort;
4327 offset += BytesPerShort;
4328 }
4329 nonstatic_byte_space_offset = offset;
4330 while (length > 0 && nonstatic_byte_count > 0) {
4331 nonstatic_byte_count -= 1;
4332 nonstatic_byte_space_count += 1;
4333 length -= 1;
4334 }
4335 // Allocate oop field in the gap if there are no other fields for that.
4336 nonstatic_oop_space_offset = offset;
4337 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
4338 allocation_style != 0) { // when oop fields not first
4339 nonstatic_oop_count -= 1;
4340 nonstatic_oop_space_count = 1; // Only one will fit
4341 length -= heapOopSize;
4342 offset += heapOopSize;
4343 }
4344 }
4345 }
4346
4347 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4348 (nonstatic_double_count * BytesPerLong);
4349 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4350 (nonstatic_word_count * BytesPerInt);
4351 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4352 (nonstatic_short_count * BytesPerShort);
4353 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4354 nonstatic_byte_count;
4355
4356 // let oops jump before padding with this allocation style
4357 if( allocation_style == 1 ) {
4358 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4359 if( nonstatic_oop_count > 0 ) {
4360 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4361 }
4362 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4363 }
4364
4365 // Aligning embedded value types
4366 // bug below, the current algorithm to layout embedded value types always put them at the
4367 // end of the layout, which doesn't match the different allocation policies the VM is
4368 // supposed to provide => FixMe
4369 // Note also that the current alignment policy is to make each value type starting on a
4370 // 64 bits boundary. This could be optimized later. For instance, it could be nice to
4371 // align value types according to their most constrained internal type.
4372 next_nonstatic_valuetype_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4373 int next_value_type_index = 0;
4374
4375 // Iterate over fields again and compute correct offsets.
4376 // The field allocation type was temporarily stored in the offset slot.
4377 // oop fields are located before non-oop fields (static and non-static).
4378 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4379
4380 // skip already laid out fields
4381 if (fs.is_offset_set()) continue;
4382
4383 // contended instance fields are handled below
4384 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4385
4386 int real_offset = 0;
4387 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4388
4389 // pack the rest of the fields
4390 switch (atype) {
4391 // Value types in static fields are handled with oops
4392 case STATIC_FLATTENABLE: // Fallthrough
4393 case STATIC_OOP:
4394 real_offset = next_static_oop_offset;
4395 next_static_oop_offset += heapOopSize;
4396 break;
4397 case STATIC_BYTE:
4398 real_offset = next_static_byte_offset;
4399 next_static_byte_offset += 1;
4400 break;
4401 case STATIC_SHORT:
4402 real_offset = next_static_short_offset;
4403 next_static_short_offset += BytesPerShort;
4404 break;
4405 case STATIC_WORD:
4406 real_offset = next_static_word_offset;
4407 next_static_word_offset += BytesPerInt;
4408 break;
4409 case STATIC_DOUBLE:
4410 real_offset = next_static_double_offset;
4411 next_static_double_offset += BytesPerLong;
4412 break;
4413 case NONSTATIC_FLATTENABLE:
4414 if (fs.is_flattened()) {
4415 Klass* klass = nonstatic_value_type_klasses[next_value_type_index];
4416 assert(klass != NULL, "Klass should have been loaded and resolved earlier");
4417 assert(klass->access_flags().is_value_type(),"Must be a value type");
4418 ValueKlass* vklass = ValueKlass::cast(klass);
4419 real_offset = next_nonstatic_valuetype_offset;
4420 next_nonstatic_valuetype_offset += (vklass->size_helper()) * wordSize - vklass->first_field_offset();
4421 // aligning next value type on a 64 bits boundary
4422 next_nonstatic_valuetype_offset = align_up(next_nonstatic_valuetype_offset, BytesPerLong);
4423 next_value_type_index += 1;
4424
4425 if (vklass->contains_oops()) { // add flatten oop maps
4426 int diff = real_offset - vklass->first_field_offset();
4427 const OopMapBlock* map = vklass->start_of_nonstatic_oop_maps();
4428 const OopMapBlock* const last_map = map + vklass->nonstatic_oop_map_count();
4429 while (map < last_map) {
4430 nonstatic_oop_maps->add(map->offset() + diff, map->count());
4431 map++;
4432 }
4433 }
4434 break;
4435 } else {
4436 // Fall through
4437 }
4438 case NONSTATIC_OOP:
4439 if( nonstatic_oop_space_count > 0 ) {
4440 real_offset = nonstatic_oop_space_offset;
4441 nonstatic_oop_space_offset += heapOopSize;
4442 nonstatic_oop_space_count -= 1;
4443 } else {
4444 real_offset = next_nonstatic_oop_offset;
4445 next_nonstatic_oop_offset += heapOopSize;
4446 }
4447 nonstatic_oop_maps->add(real_offset, 1);
4448 break;
4449 case NONSTATIC_BYTE:
4450 if( nonstatic_byte_space_count > 0 ) {
4451 real_offset = nonstatic_byte_space_offset;
4452 nonstatic_byte_space_offset += 1;
4453 nonstatic_byte_space_count -= 1;
4454 } else {
4455 real_offset = next_nonstatic_byte_offset;
4456 next_nonstatic_byte_offset += 1;
4457 }
4458 break;
4459 case NONSTATIC_SHORT:
4460 if( nonstatic_short_space_count > 0 ) {
4461 real_offset = nonstatic_short_space_offset;
4462 nonstatic_short_space_offset += BytesPerShort;
4463 nonstatic_short_space_count -= 1;
4464 } else {
4465 real_offset = next_nonstatic_short_offset;
4466 next_nonstatic_short_offset += BytesPerShort;
4467 }
4468 break;
4469 case NONSTATIC_WORD:
4470 if( nonstatic_word_space_count > 0 ) {
4471 real_offset = nonstatic_word_space_offset;
4472 nonstatic_word_space_offset += BytesPerInt;
4473 nonstatic_word_space_count -= 1;
4474 } else {
4475 real_offset = next_nonstatic_word_offset;
4476 next_nonstatic_word_offset += BytesPerInt;
4477 }
4478 break;
4479 case NONSTATIC_DOUBLE:
4480 real_offset = next_nonstatic_double_offset;
4481 next_nonstatic_double_offset += BytesPerLong;
4482 break;
4483 default:
4484 ShouldNotReachHere();
4485 }
4486 fs.set_offset(real_offset);
4487 }
4488
4489
4490 // Handle the contended cases.
4491 //
4492 // Each contended field should not intersect the cache line with another contended field.
4493 // In the absence of alignment information, we end up with pessimistically separating
4494 // the fields with full-width padding.
4495 //
4496 // Additionally, this should not break alignment for the fields, so we round the alignment up
4497 // for each field.
4498 if (nonstatic_contended_count > 0) {
4499
4500 // if there is at least one contended field, we need to have pre-padding for them
4501 next_nonstatic_padded_offset += ContendedPaddingWidth;
4502
4503 // collect all contended groups
4504 ResourceBitMap bm(cp->size());
4505 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4506 // skip already laid out fields
4507 if (fs.is_offset_set()) continue;
4508
4509 if (fs.is_contended()) {
4510 bm.set_bit(fs.contended_group());
4511 }
4512 }
4513
4514 int current_group = -1;
4515 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4516
4517 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4518
4519 // skip already laid out fields
4520 if (fs.is_offset_set()) continue;
4521
4522 // skip non-contended fields and fields from different group
4523 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4524
4525 // handle statics below
4526 if (fs.access_flags().is_static()) continue;
4527
4528 int real_offset = 0;
4529 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4530
4531 switch (atype) {
4532 case NONSTATIC_BYTE:
4533 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4534 real_offset = next_nonstatic_padded_offset;
4535 next_nonstatic_padded_offset += 1;
4536 break;
4537
4538 case NONSTATIC_SHORT:
4539 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4540 real_offset = next_nonstatic_padded_offset;
4541 next_nonstatic_padded_offset += BytesPerShort;
4542 break;
4543
4544 case NONSTATIC_WORD:
4545 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4546 real_offset = next_nonstatic_padded_offset;
4547 next_nonstatic_padded_offset += BytesPerInt;
4548 break;
4549
4550 case NONSTATIC_DOUBLE:
4551 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4552 real_offset = next_nonstatic_padded_offset;
4553 next_nonstatic_padded_offset += BytesPerLong;
4554 break;
4555
4556 // Value types in static fields are handled with oops
4557 case NONSTATIC_FLATTENABLE:
4558 throwValueTypeLimitation(THREAD_AND_LOCATION,
4559 "@Contended annotation not supported for value types yet", fs.name(), fs.signature());
4560 return;
4561
4562 case NONSTATIC_OOP:
4563 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4564 real_offset = next_nonstatic_padded_offset;
4565 next_nonstatic_padded_offset += heapOopSize;
4566 nonstatic_oop_maps->add(real_offset, 1);
4567 break;
4568
4569 default:
4570 ShouldNotReachHere();
4571 }
4572
4573 if (fs.contended_group() == 0) {
4574 // Contended group defines the equivalence class over the fields:
4575 // the fields within the same contended group are not inter-padded.
4576 // The only exception is default group, which does not incur the
4577 // equivalence, and so requires intra-padding.
4578 next_nonstatic_padded_offset += ContendedPaddingWidth;
4579 }
4580
4581 fs.set_offset(real_offset);
4582 } // for
4583
4584 // Start laying out the next group.
4585 // Note that this will effectively pad the last group in the back;
4586 // this is expected to alleviate memory contention effects for
4587 // subclass fields and/or adjacent object.
4588 // If this was the default group, the padding is already in place.
4589 if (current_group != 0) {
4590 next_nonstatic_padded_offset += ContendedPaddingWidth;
4591 }
4592 }
4593
4594 // handle static fields
4595 }
4596
4597 // Entire class is contended, pad in the back.
4598 // This helps to alleviate memory contention effects for subclass fields
4599 // and/or adjacent object.
4600 if (is_contended_class) {
4601 assert(!is_value_type(), "@Contended not supported for value types yet");
4602 next_nonstatic_padded_offset += ContendedPaddingWidth;
4603 }
4604
4605 int notaligned_nonstatic_fields_end;
4606 if (nonstatic_value_type_count != 0) {
4607 notaligned_nonstatic_fields_end = next_nonstatic_valuetype_offset;
4608 } else {
4609 notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4610 }
4611
4612 int nonstatic_field_sz_align = heapOopSize;
4613 if (is_value_type()) {
4614 if ((notaligned_nonstatic_fields_end - nonstatic_fields_start) > heapOopSize) {
4615 nonstatic_field_sz_align = BytesPerLong; // value copy of fields only uses jlong copy
4616 }
4617 }
4618 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, nonstatic_field_sz_align);
4619 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4620 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4621
4622 int static_field_size = (static_fields_end -
4623 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4624 nonstatic_field_size = nonstatic_field_size +
4625 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4626
4627 int instance_size = align_object_size(instance_end / wordSize);
4628
4629 assert(instance_size == align_object_size(align_up(
4630 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize)
4631 + initial_value_type_padding, wordSize) / wordSize), "consistent layout helper value");
4632
4633
4634 // Invariant: nonstatic_field end/start should only change if there are
4635 // nonstatic fields in the class, or if the class is contended. We compare
4636 // against the non-aligned value, so that end alignment will not fail the
4637 // assert without actually having the fields.
4638 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4639 is_contended_class ||
4640 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4641
4642 // Number of non-static oop map blocks allocated at end of klass.
4643 nonstatic_oop_maps->compact(THREAD);
4644
4645 #ifndef PRODUCT
4646 if ((PrintFieldLayout && !is_value_type()) ||
4647 (PrintValueLayout && (is_value_type() || has_nonstatic_value_fields))) {
4648 print_field_layout(_class_name,
4649 _fields,
4650 cp,
4651 instance_size,
4652 nonstatic_fields_start,
4653 nonstatic_fields_end,
4654 static_fields_end);
4655 nonstatic_oop_maps->print_on(tty);
4656 tty->print("\n");
4657 }
4658
4659 #endif
4660 // Pass back information needed for InstanceKlass creation
4661 info->oop_map_blocks = nonstatic_oop_maps;
4662 info->instance_size = instance_size;
4663 info->static_field_size = static_field_size;
4664 info->nonstatic_field_size = nonstatic_field_size;
4665 info->has_nonstatic_fields = has_nonstatic_fields;
4666 }
4667
4668 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik, TRAPS) {
4669 assert(ik != NULL, "invariant");
4670
4671 const Klass* const super = ik->super();
4672
4673 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4674 // in which case we don't have to register objects as finalizable
4675 if (!_has_empty_finalizer) {
4676 if (_has_finalizer ||
4677 (super != NULL && super->has_finalizer())) {
4678 ik->set_has_finalizer();
4679 }
4680 }
4681
4682 #ifdef ASSERT
4683 bool f = false;
4684 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4685 vmSymbols::void_method_signature());
4686 if (m != NULL && !m->is_empty_method()) {
4687 f = true;
4688 }
4689
4690 // Spec doesn't prevent agent from redefinition of empty finalizer.
4691 // Despite the fact that it's generally bad idea and redefined finalizer
4692 // will not work as expected we shouldn't abort vm in this case
4693 if (!ik->has_redefined_this_or_super()) {
4694 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4695 }
4696 #endif
4697
4698 // Check if this klass supports the java.lang.Cloneable interface
4699 if (SystemDictionary::Cloneable_klass_loaded()) {
4700 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4701 if (ik->is_value()) {
4702 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support Cloneable");
4703 return;
4704 }
4705 ik->set_is_cloneable();
4706 }
4707 }
4708
4709 // Check if this klass has a vanilla default constructor
4710 if (super == NULL) {
4711 // java.lang.Object has empty default constructor
4712 ik->set_has_vanilla_constructor();
4713 } else {
4714 if (super->has_vanilla_constructor() &&
4715 _has_vanilla_constructor) {
4716 ik->set_has_vanilla_constructor();
4717 }
4718 #ifdef ASSERT
4719 bool v = false;
4720 if (super->has_vanilla_constructor()) {
4721 const Method* const constructor =
4722 ik->find_method(vmSymbols::object_initializer_name(),
4723 vmSymbols::void_method_signature());
4724 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4725 v = true;
4726 }
4727 }
4728 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4729 #endif
4730 }
4731
4732 // If it cannot be fast-path allocated, set a bit in the layout helper.
4733 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4734 assert(ik->size_helper() > 0, "layout_helper is initialized");
4735 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4736 || ik->is_abstract() || ik->is_interface()
4737 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4738 || ik->size_helper() >= FastAllocateSizeLimit) {
4739 // Forbid fast-path allocation.
4740 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4741 ik->set_layout_helper(lh);
4742 }
4743 }
4744
4745 bool ClassFileParser::supports_value_types() const {
4746 // Value types are only supported by class file version 55 and later
4747 return _major_version >= JAVA_11_VERSION;
4748 }
4749
4750 // Attach super classes and interface classes to class loader data
4751 static void record_defined_class_dependencies(const InstanceKlass* defined_klass,
4752 TRAPS) {
4753 assert(defined_klass != NULL, "invariant");
4754
4755 ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data();
4756 if (defining_loader_data->is_the_null_class_loader_data()) {
4757 // Dependencies to null class loader data are implicit.
4758 return;
4759 } else {
4760 // add super class dependency
4761 Klass* const super = defined_klass->super();
4762 if (super != NULL) {
4763 defining_loader_data->record_dependency(super);
4764 }
4765
4766 // add super interface dependencies
4767 const Array<InstanceKlass*>* const local_interfaces = defined_klass->local_interfaces();
4768 if (local_interfaces != NULL) {
4769 const int length = local_interfaces->length();
4770 for (int i = 0; i < length; i++) {
4771 defining_loader_data->record_dependency(local_interfaces->at(i));
4772 }
4773 }
4774
4775 for(int i = 0; i < defined_klass->java_fields_count(); i++) {
4776 if ((defined_klass->field_access_flags(i) & JVM_ACC_FLATTENABLE) != 0) {
4777 const Klass* klass = defined_klass->get_value_field_klass(i);
4778 defining_loader_data->record_dependency(klass);
4779 }
4780 }
4781 }
4782 }
4783
4784 // utility methods for appending an array with check for duplicates
4785
4786 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4787 const Array<InstanceKlass*>* const ifs) {
4788 // iterate over new interfaces
4789 for (int i = 0; i < ifs->length(); i++) {
4790 InstanceKlass* const e = ifs->at(i);
4791 assert(e->is_klass() && e->is_interface(), "just checking");
4792 // add new interface
4793 result->append_if_missing(e);
4794 }
4795 }
4796
4797 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4798 Array<InstanceKlass*>* local_ifs,
4799 ClassLoaderData* loader_data,
4800 TRAPS) {
4801 assert(local_ifs != NULL, "invariant");
4802 assert(loader_data != NULL, "invariant");
4803
4804 // Compute maximum size for transitive interfaces
4805 int max_transitive_size = 0;
4806 int super_size = 0;
4807 // Add superclass transitive interfaces size
4808 if (super != NULL) {
4809 super_size = super->transitive_interfaces()->length();
4810 max_transitive_size += super_size;
4811 }
4812 // Add local interfaces' super interfaces
4813 const int local_size = local_ifs->length();
4814 for (int i = 0; i < local_size; i++) {
4815 InstanceKlass* const l = local_ifs->at(i);
4816 max_transitive_size += l->transitive_interfaces()->length();
4817 }
4818 // Finally add local interfaces
4819 max_transitive_size += local_size;
4820 // Construct array
4821 if (max_transitive_size == 0) {
4822 // no interfaces, use canonicalized array
4823 return Universe::the_empty_instance_klass_array();
4824 } else if (max_transitive_size == super_size) {
4825 // no new local interfaces added, share superklass' transitive interface array
4826 return super->transitive_interfaces();
4827 } else if (max_transitive_size == local_size) {
4828 // only local interfaces added, share local interface array
4829 return local_ifs;
4830 } else {
4831 ResourceMark rm;
4832 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4833
4834 // Copy down from superclass
4835 if (super != NULL) {
4836 append_interfaces(result, super->transitive_interfaces());
4837 }
4838
4839 // Copy down from local interfaces' superinterfaces
4840 for (int i = 0; i < local_size; i++) {
4841 InstanceKlass* const l = local_ifs->at(i);
4842 append_interfaces(result, l->transitive_interfaces());
4843 }
4844 // Finally add local interfaces
4845 append_interfaces(result, local_ifs);
4846
4847 // length will be less than the max_transitive_size if duplicates were removed
4848 const int length = result->length();
4849 assert(length <= max_transitive_size, "just checking");
4850 Array<InstanceKlass*>* const new_result =
4851 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4852 for (int i = 0; i < length; i++) {
4853 InstanceKlass* const e = result->at(i);
4854 assert(e != NULL, "just checking");
4855 new_result->at_put(i, e);
4856 }
4857 return new_result;
4858 }
4859 }
4860
4861 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4862 assert(this_klass != NULL, "invariant");
4863 const Klass* const super = this_klass->super();
4864 if (super != NULL) {
4865
4866 // If the loader is not the boot loader then throw an exception if its
4867 // superclass is in package jdk.internal.reflect and its loader is not a
4868 // special reflection class loader
4869 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4870 assert(super->is_instance_klass(), "super is not instance klass");
4871 PackageEntry* super_package = super->package();
4872 if (super_package != NULL &&
4873 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4874 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4875 ResourceMark rm(THREAD);
4876 Exceptions::fthrow(
4877 THREAD_AND_LOCATION,
4878 vmSymbols::java_lang_IllegalAccessError(),
4879 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4880 this_klass->external_name(),
4881 this_klass->class_loader_data()->loader_name_and_id(),
4882 super->external_name());
4883 return;
4884 }
4885 }
4886
4887 Reflection::VerifyClassAccessResults vca_result =
4888 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4889 if (vca_result != Reflection::ACCESS_OK) {
4890 ResourceMark rm(THREAD);
4891 char* msg = Reflection::verify_class_access_msg(this_klass,
4892 InstanceKlass::cast(super),
4893 vca_result);
4894 if (msg == NULL) {
4895 bool same_module = (this_klass->module() == super->module());
4896 Exceptions::fthrow(
4897 THREAD_AND_LOCATION,
4898 vmSymbols::java_lang_IllegalAccessError(),
4899 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4900 this_klass->external_name(),
4901 super->is_abstract() ? "abstract " : "",
4902 super->external_name(),
4903 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4904 (same_module) ? "" : "; ",
4905 (same_module) ? "" : super->class_in_module_of_loader());
4906 } else {
4907 // Add additional message content.
4908 Exceptions::fthrow(
4909 THREAD_AND_LOCATION,
4910 vmSymbols::java_lang_IllegalAccessError(),
4911 "superclass access check failed: %s",
4912 msg);
4913 }
4914 }
4915 }
4916 }
4917
4918
4919 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4920 assert(this_klass != NULL, "invariant");
4921 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4922 const int lng = local_interfaces->length();
4923 for (int i = lng - 1; i >= 0; i--) {
4924 InstanceKlass* const k = local_interfaces->at(i);
4925 assert (k != NULL && k->is_interface(), "invalid interface");
4926 Reflection::VerifyClassAccessResults vca_result =
4927 Reflection::verify_class_access(this_klass, k, false);
4928 if (vca_result != Reflection::ACCESS_OK) {
4929 ResourceMark rm(THREAD);
4930 char* msg = Reflection::verify_class_access_msg(this_klass,
4931 k,
4932 vca_result);
4933 if (msg == NULL) {
4934 bool same_module = (this_klass->module() == k->module());
4935 Exceptions::fthrow(
4936 THREAD_AND_LOCATION,
4937 vmSymbols::java_lang_IllegalAccessError(),
4938 "class %s cannot access its superinterface %s (%s%s%s)",
4939 this_klass->external_name(),
4940 k->external_name(),
4941 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4942 (same_module) ? "" : "; ",
4943 (same_module) ? "" : k->class_in_module_of_loader());
4944 } else {
4945 // Add additional message content.
4946 Exceptions::fthrow(
4947 THREAD_AND_LOCATION,
4948 vmSymbols::java_lang_IllegalAccessError(),
4949 "superinterface check failed: %s",
4950 msg);
4951 }
4952 }
4953 }
4954 }
4955
4956
4957 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4958 assert(this_klass != NULL, "invariant");
4959 const Array<Method*>* const methods = this_klass->methods();
4960 const int num_methods = methods->length();
4961
4962 // go thru each method and check if it overrides a final method
4963 for (int index = 0; index < num_methods; index++) {
4964 const Method* const m = methods->at(index);
4965
4966 // skip private, static, and <init> methods
4967 if ((!m->is_private() && !m->is_static()) &&
4968 (m->name() != vmSymbols::object_initializer_name())) {
4969
4970 const Symbol* const name = m->name();
4971 const Symbol* const signature = m->signature();
4972 const Klass* k = this_klass->super();
4973 const Method* super_m = NULL;
4974 while (k != NULL) {
4975 // skip supers that don't have final methods.
4976 if (k->has_final_method()) {
4977 // lookup a matching method in the super class hierarchy
4978 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4979 if (super_m == NULL) {
4980 break; // didn't find any match; get out
4981 }
4982
4983 if (super_m->is_final() && !super_m->is_static() &&
4984 !super_m->access_flags().is_private()) {
4985 // matching method in super is final, and not static or private
4986 bool can_access = Reflection::verify_member_access(this_klass,
4987 super_m->method_holder(),
4988 super_m->method_holder(),
4989 super_m->access_flags(),
4990 false, false, CHECK);
4991 if (can_access) {
4992 // this class can access super final method and therefore override
4993 ResourceMark rm(THREAD);
4994 Exceptions::fthrow(THREAD_AND_LOCATION,
4995 vmSymbols::java_lang_VerifyError(),
4996 "class %s overrides final method %s.%s%s",
4997 this_klass->external_name(),
4998 super_m->method_holder()->external_name(),
4999 name->as_C_string(),
5000 signature->as_C_string()
5001 );
5002 return;
5003 }
5004 }
5005
5006 // continue to look from super_m's holder's super.
5007 k = super_m->method_holder()->super();
5008 continue;
5009 }
5010
5011 k = k->super();
5012 }
5013 }
5014 }
5015 }
5016
5017
5018 // assumes that this_klass is an interface
5019 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
5020 assert(this_klass != NULL, "invariant");
5021 assert(this_klass->is_interface(), "not an interface");
5022 const Array<Method*>* methods = this_klass->methods();
5023 const int num_methods = methods->length();
5024
5025 for (int index = 0; index < num_methods; index++) {
5026 const Method* const m = methods->at(index);
5027 // if m is static and not the init method, throw a verify error
5028 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
5029 ResourceMark rm(THREAD);
5030 Exceptions::fthrow(
5031 THREAD_AND_LOCATION,
5032 vmSymbols::java_lang_VerifyError(),
5033 "Illegal static method %s in interface %s",
5034 m->name()->as_C_string(),
5035 this_klass->external_name()
5036 );
5037 return;
5038 }
5039 }
5040 }
5041
5042 // utility methods for format checking
5043
5044 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
5045 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5046 const bool is_value_type = (flags & JVM_ACC_VALUE) != 0;
5047 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
5048 assert(supports_value_types() || !is_value_type, "JVM_ACC_VALUE should not be set");
5049 if (is_module) {
5050 ResourceMark rm(THREAD);
5051 Exceptions::fthrow(
5052 THREAD_AND_LOCATION,
5053 vmSymbols::java_lang_NoClassDefFoundError(),
5054 "%s is not a class because access_flag ACC_MODULE is set",
5055 _class_name->as_C_string());
5056 return;
5057 }
5058
5059 if (is_value_type && !EnableValhalla) {
5060 ResourceMark rm(THREAD);
5061 Exceptions::fthrow(
5062 THREAD_AND_LOCATION,
5063 vmSymbols::java_lang_ClassFormatError(),
5064 "Class modifier ACC_VALUE in class %s requires option -XX:+EnableValhalla",
5065 _class_name->as_C_string()
5066 );
5067 }
5068
5069 if (!_need_verify) { return; }
5070
5071 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5072 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5073 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5074 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
5075 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5076 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
5077 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5078
5079 if ((is_abstract && is_final) ||
5080 (is_interface && !is_abstract) ||
5081 (is_interface && major_gte_15 && (is_super || is_enum)) ||
5082 (!is_interface && major_gte_15 && is_annotation) ||
5083 (is_value_type && (is_interface || is_abstract || is_enum || !is_final))) {
5084 ResourceMark rm(THREAD);
5085 Exceptions::fthrow(
5086 THREAD_AND_LOCATION,
5087 vmSymbols::java_lang_ClassFormatError(),
5088 "Illegal class modifiers in class %s: 0x%X",
5089 _class_name->as_C_string(), flags
5090 );
5091 return;
5092 }
5093 }
5094
5095 static bool has_illegal_visibility(jint flags) {
5096 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5097 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5098 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5099
5100 return ((is_public && is_protected) ||
5101 (is_public && is_private) ||
5102 (is_protected && is_private));
5103 }
5104
5105 // A legal major_version.minor_version must be one of the following:
5106 //
5107 // Major_version = 45, any minor_version.
5108 // Major_version >= 46 and major_version <= current_major_version and minor_version = 0.
5109 // Major_version = current_major_version and minor_version = 65535 and --enable-preview is present.
5110 //
5111 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
5112 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
5113 if (major != JAVA_MIN_SUPPORTED_VERSION) { // All 45.* are ok including 45.65535
5114 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
5115 if (major != max_version) {
5116 ResourceMark rm(THREAD);
5117 Exceptions::fthrow(
5118 THREAD_AND_LOCATION,
5119 vmSymbols::java_lang_UnsupportedClassVersionError(),
5120 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
5121 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
5122 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
5123 return;
5124 }
5125
5126 if (!Arguments::enable_preview()) {
5127 ResourceMark rm(THREAD);
5128 Exceptions::fthrow(
5129 THREAD_AND_LOCATION,
5130 vmSymbols::java_lang_UnsupportedClassVersionError(),
5131 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
5132 class_name->as_C_string(), major, minor);
5133 return;
5134 }
5135
5136 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
5137 if (major > max_version) {
5138 ResourceMark rm(THREAD);
5139 Exceptions::fthrow(
5140 THREAD_AND_LOCATION,
5141 vmSymbols::java_lang_UnsupportedClassVersionError(),
5142 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5143 "this version of the Java Runtime only recognizes class file versions up to %u.0",
5144 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
5145 } else if (major < JAVA_MIN_SUPPORTED_VERSION) {
5146 ResourceMark rm(THREAD);
5147 Exceptions::fthrow(
5148 THREAD_AND_LOCATION,
5149 vmSymbols::java_lang_UnsupportedClassVersionError(),
5150 "%s (class file version %u.%u) was compiled with an invalid major version",
5151 class_name->as_C_string(), major, minor);
5152 } else if (minor != 0) {
5153 ResourceMark rm(THREAD);
5154 Exceptions::fthrow(
5155 THREAD_AND_LOCATION,
5156 vmSymbols::java_lang_UnsupportedClassVersionError(),
5157 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
5158 class_name->as_C_string(), major, minor);
5159 }
5160 }
5161 }
5162 }
5163
5164 void ClassFileParser::verify_legal_field_modifiers(jint flags,
5165 bool is_interface,
5166 bool is_value_type,
5167 TRAPS) const {
5168 if (!_need_verify) { return; }
5169
5170 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5171 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5172 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5173 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5174 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5175 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
5176 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
5177 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5178 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5179
5180 bool is_illegal = false;
5181
5182 if (is_interface) {
5183 if (!is_public || !is_static || !is_final || is_private ||
5184 is_protected || is_volatile || is_transient ||
5185 (major_gte_15 && is_enum)) {
5186 is_illegal = true;
5187 }
5188 } else { // not interface
5189 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
5190 is_illegal = true;
5191 } else {
5192 if (is_value_type && !is_static && !is_final) {
5193 is_illegal = true;
5194 }
5195 }
5196 }
5197
5198 if (is_illegal) {
5199 ResourceMark rm(THREAD);
5200 Exceptions::fthrow(
5201 THREAD_AND_LOCATION,
5202 vmSymbols::java_lang_ClassFormatError(),
5203 "Illegal field modifiers in class %s: 0x%X",
5204 _class_name->as_C_string(), flags);
5205 return;
5206 }
5207 }
5208
5209 void ClassFileParser::verify_legal_method_modifiers(jint flags,
5210 bool is_interface,
5211 bool is_value_type,
5212 const Symbol* name,
5213 TRAPS) const {
5214 if (!_need_verify) { return; }
5215
5216 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5217 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5218 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5219 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5220 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
5221 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5222 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
5223 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
5224 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
5225 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5226 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5227 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
5228 const bool is_initializer = (name == vmSymbols::object_initializer_name());
5229
5230 bool is_illegal = false;
5231
5232 if (is_interface) {
5233 if (major_gte_8) {
5234 // Class file version is JAVA_8_VERSION or later Methods of
5235 // interfaces may set any of the flags except ACC_PROTECTED,
5236 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5237 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5238 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5239 (is_native || is_protected || is_final || is_synchronized) ||
5240 // If a specific method of a class or interface has its
5241 // ACC_ABSTRACT flag set, it must not have any of its
5242 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5243 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
5244 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5245 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5246 (is_abstract && (is_private || is_static || is_strict))) {
5247 is_illegal = true;
5248 }
5249 } else if (major_gte_15) {
5250 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5251 if (!is_public || is_private || is_protected || is_static || is_final ||
5252 is_synchronized || is_native || !is_abstract || is_strict) {
5253 is_illegal = true;
5254 }
5255 } else {
5256 // Class file version is pre-JAVA_1_5_VERSION
5257 if (!is_public || is_static || is_final || is_native || !is_abstract) {
5258 is_illegal = true;
5259 }
5260 }
5261 } else { // not interface
5262 if (has_illegal_visibility(flags)) {
5263 is_illegal = true;
5264 } else {
5265 if (is_initializer) {
5266 if (is_static || is_final || is_synchronized || is_native ||
5267 is_abstract || (major_gte_15 && is_bridge)) {
5268 is_illegal = true;
5269 }
5270 } else { // not initializer
5271 if (is_value_type && is_synchronized && !is_static) {
5272 is_illegal = true;
5273 } else {
5274 if (is_abstract) {
5275 if ((is_final || is_native || is_private || is_static ||
5276 (major_gte_15 && (is_synchronized || is_strict)))) {
5277 is_illegal = true;
5278 }
5279 }
5280 }
5281 }
5282 }
5283 }
5284
5285 if (is_illegal) {
5286 ResourceMark rm(THREAD);
5287 Exceptions::fthrow(
5288 THREAD_AND_LOCATION,
5289 vmSymbols::java_lang_ClassFormatError(),
5290 "Method %s in class %s has illegal modifiers: 0x%X",
5291 name->as_C_string(), _class_name->as_C_string(), flags);
5292 return;
5293 }
5294 }
5295
5296 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5297 int length,
5298 TRAPS) const {
5299 assert(_need_verify, "only called when _need_verify is true");
5300 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5301 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5302 }
5303 }
5304
5305 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5306 // In class names, '/' separates unqualified names. This is verified in this function also.
5307 // Method names also may not contain the characters '<' or '>', unless <init>
5308 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5309 // method. Because these names have been checked as special cases before
5310 // calling this method in verify_legal_method_name.
5311 //
5312 // This method is also called from the modular system APIs in modules.cpp
5313 // to verify the validity of module and package names.
5314 bool ClassFileParser::verify_unqualified_name(const char* name,
5315 unsigned int length,
5316 int type) {
5317 for (const char* p = name; p != name + length;) {
5318 jchar ch = *p;
5319 if (ch < 128) {
5320 if (ch == '.' || ch == ';' || ch == '[' ) {
5321 return false; // do not permit '.', ';', or '['
5322 }
5323 if (ch == '/') {
5324 // check for '//' or leading or trailing '/' which are not legal
5325 // unqualified name must not be empty
5326 if (type == ClassFileParser::LegalClass) {
5327 if (p == name || p+1 >= name+length || *(p+1) == '/') {
5328 return false;
5329 }
5330 } else {
5331 return false; // do not permit '/' unless it's class name
5332 }
5333 }
5334 if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) {
5335 return false; // do not permit '<' or '>' in method names
5336 }
5337 p++;
5338 } else {
5339 char* tmp_p = UTF8::next(p, &ch);
5340 p = tmp_p;
5341 }
5342 }
5343 return true;
5344 }
5345
5346 // Take pointer to a string. Skip over the longest part of the string that could
5347 // be taken as a fieldname. Allow '/' if slash_ok is true.
5348 // Return a pointer to just past the fieldname.
5349 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5350 // being true, we saw consecutive slashes (meaning we were looking for a
5351 // qualified path but found something that was badly-formed).
5352 static const char* skip_over_field_name(const char* name,
5353 bool slash_ok,
5354 unsigned int length) {
5355 const char* p;
5356 jboolean last_is_slash = false;
5357 jboolean not_first_ch = false;
5358
5359 for (p = name; p != name + length; not_first_ch = true) {
5360 const char* old_p = p;
5361 jchar ch = *p;
5362 if (ch < 128) {
5363 p++;
5364 // quick check for ascii
5365 if ((ch >= 'a' && ch <= 'z') ||
5366 (ch >= 'A' && ch <= 'Z') ||
5367 (ch == '_' || ch == '$') ||
5368 (not_first_ch && ch >= '0' && ch <= '9')) {
5369 last_is_slash = false;
5370 continue;
5371 }
5372 if (slash_ok && ch == '/') {
5373 if (last_is_slash) {
5374 return NULL; // Don't permit consecutive slashes
5375 }
5376 last_is_slash = true;
5377 continue;
5378 }
5379 }
5380 else {
5381 jint unicode_ch;
5382 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5383 p = tmp_p;
5384 last_is_slash = false;
5385 // Check if ch is Java identifier start or is Java identifier part
5386 // 4672820: call java.lang.Character methods directly without generating separate tables.
5387 EXCEPTION_MARK;
5388
5389 // return value
5390 JavaValue result(T_BOOLEAN);
5391 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5392 JavaCallArguments args;
5393 args.push_int(unicode_ch);
5394
5395 // public static boolean isJavaIdentifierStart(char ch);
5396 JavaCalls::call_static(&result,
5397 SystemDictionary::Character_klass(),
5398 vmSymbols::isJavaIdentifierStart_name(),
5399 vmSymbols::int_bool_signature(),
5400 &args,
5401 THREAD);
5402
5403 if (HAS_PENDING_EXCEPTION) {
5404 CLEAR_PENDING_EXCEPTION;
5405 return 0;
5406 }
5407 if (result.get_jboolean()) {
5408 continue;
5409 }
5410
5411 if (not_first_ch) {
5412 // public static boolean isJavaIdentifierPart(char ch);
5413 JavaCalls::call_static(&result,
5414 SystemDictionary::Character_klass(),
5415 vmSymbols::isJavaIdentifierPart_name(),
5416 vmSymbols::int_bool_signature(),
5417 &args,
5418 THREAD);
5419
5420 if (HAS_PENDING_EXCEPTION) {
5421 CLEAR_PENDING_EXCEPTION;
5422 return 0;
5423 }
5424
5425 if (result.get_jboolean()) {
5426 continue;
5427 }
5428 }
5429 }
5430 return (not_first_ch) ? old_p : NULL;
5431 }
5432 return (not_first_ch) ? p : NULL;
5433 }
5434
5435 // Take pointer to a string. Skip over the longest part of the string that could
5436 // be taken as a field signature. Allow "void" if void_ok.
5437 // Return a pointer to just past the signature.
5438 // Return NULL if no legal signature is found.
5439 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5440 bool void_ok,
5441 unsigned int length,
5442 TRAPS) const {
5443 unsigned int array_dim = 0;
5444 while (length > 0) {
5445 switch (signature[0]) {
5446 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5447 case JVM_SIGNATURE_BOOLEAN:
5448 case JVM_SIGNATURE_BYTE:
5449 case JVM_SIGNATURE_CHAR:
5450 case JVM_SIGNATURE_SHORT:
5451 case JVM_SIGNATURE_INT:
5452 case JVM_SIGNATURE_FLOAT:
5453 case JVM_SIGNATURE_LONG:
5454 case JVM_SIGNATURE_DOUBLE:
5455 return signature + 1;
5456 case JVM_SIGNATURE_VALUETYPE:
5457 // Can't enable this check until JDK upgrades the bytecode generators
5458 // if (_major_version < CONSTANT_CLASS_DESCRIPTORS ) {
5459 // classfile_parse_error("Class name contains illegal Q-signature "
5460 // "in descriptor in class file %s",
5461 // CHECK_0);
5462 // }
5463 // fall through
5464 case JVM_SIGNATURE_CLASS:
5465 {
5466 if (_major_version < JAVA_1_5_VERSION) {
5467 // Skip over the class name if one is there
5468 const char* const p = skip_over_field_name(signature + 1, true, --length);
5469
5470 // The next character better be a semicolon
5471 if (p && (p - signature) > 1 && p[0] == ';') {
5472 return p + 1;
5473 }
5474 }
5475 else {
5476 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
5477 length--;
5478 signature++;
5479 char* c = strchr((char*) signature, ';');
5480 // Format check signature
5481 if (c != NULL) {
5482 ResourceMark rm(THREAD);
5483 int newlen = c - (char*) signature;
5484 char* sig = NEW_RESOURCE_ARRAY(char, newlen + 1);
5485 strncpy(sig, signature, newlen);
5486 sig[newlen] = '\0';
5487
5488 bool legal = verify_unqualified_name(sig, newlen, LegalClass);
5489 if (!legal) {
5490 classfile_parse_error("Class name contains illegal character "
5491 "in descriptor in class file %s",
5492 CHECK_0);
5493 return NULL;
5494 }
5495 return signature + newlen + 1;
5496 }
5497 }
5498 return NULL;
5499 }
5500 case JVM_SIGNATURE_ARRAY:
5501 array_dim++;
5502 if (array_dim > 255) {
5503 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5504 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5505 }
5506 // The rest of what's there better be a legal signature
5507 signature++;
5508 length--;
5509 void_ok = false;
5510 break;
5511 default:
5512 return NULL;
5513 }
5514 }
5515 return NULL;
5516 }
5517
5518 // Checks if name is a legal class name.
5519 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5520 if (!_need_verify || _relax_verify) { return; }
5521
5522 char buf[fixed_buffer_size];
5523 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5524 unsigned int length = name->utf8_length();
5525 bool legal = false;
5526
5527 if (length > 0) {
5528 const char* p;
5529 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5530 p = skip_over_field_signature(bytes, false, length, CHECK);
5531 legal = (p != NULL) && ((p - bytes) == (int)length);
5532 } else if (_major_version < JAVA_1_5_VERSION) {
5533 if (bytes[0] != '<') {
5534 p = skip_over_field_name(bytes, true, length);
5535 legal = (p != NULL) && ((p - bytes) == (int)length);
5536 }
5537 } else if (_major_version >= CONSTANT_CLASS_DESCRIPTORS && bytes[length - 1] == ';' ) {
5538 // Support for L...; and Q...; descriptors
5539 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
5540 } else {
5541 // 4900761: relax the constraints based on JSR202 spec
5542 // Class names may be drawn from the entire Unicode character set.
5543 // Identifiers between '/' must be unqualified names.
5544 // The utf8 string has been verified when parsing cpool entries.
5545 legal = verify_unqualified_name(bytes, length, LegalClass);
5546 }
5547 }
5548 if (!legal) {
5549 ResourceMark rm(THREAD);
5550 assert(_class_name != NULL, "invariant");
5551 Exceptions::fthrow(
5552 THREAD_AND_LOCATION,
5553 vmSymbols::java_lang_ClassFormatError(),
5554 "Illegal class name \"%s\" in class file %s", bytes,
5555 _class_name->as_C_string()
5556 );
5557 return;
5558 }
5559 }
5560
5561 // Checks if name is a legal field name.
5562 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5563 if (!_need_verify || _relax_verify) { return; }
5564
5565 char buf[fixed_buffer_size];
5566 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5567 unsigned int length = name->utf8_length();
5568 bool legal = false;
5569
5570 if (length > 0) {
5571 if (_major_version < JAVA_1_5_VERSION) {
5572 if (bytes[0] != '<') {
5573 const char* p = skip_over_field_name(bytes, false, length);
5574 legal = (p != NULL) && ((p - bytes) == (int)length);
5575 }
5576 } else {
5577 // 4881221: relax the constraints based on JSR202 spec
5578 legal = verify_unqualified_name(bytes, length, LegalField);
5579 }
5580 }
5581
5582 if (!legal) {
5583 ResourceMark rm(THREAD);
5584 assert(_class_name != NULL, "invariant");
5585 Exceptions::fthrow(
5586 THREAD_AND_LOCATION,
5587 vmSymbols::java_lang_ClassFormatError(),
5588 "Illegal field name \"%s\" in class %s", bytes,
5589 _class_name->as_C_string()
5590 );
5591 return;
5592 }
5593 }
5594
5595 // Checks if name is a legal method name.
5596 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5597 if (!_need_verify || _relax_verify) { return; }
5598
5599 assert(name != NULL, "method name is null");
5600 char buf[fixed_buffer_size];
5601 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5602 unsigned int length = name->utf8_length();
5603 bool legal = false;
5604
5605 if (length > 0) {
5606 if (bytes[0] == '<') {
5607 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5608 legal = true;
5609 }
5610 } else if (_major_version < JAVA_1_5_VERSION) {
5611 const char* p;
5612 p = skip_over_field_name(bytes, false, length);
5613 legal = (p != NULL) && ((p - bytes) == (int)length);
5614 } else {
5615 // 4881221: relax the constraints based on JSR202 spec
5616 legal = verify_unqualified_name(bytes, length, LegalMethod);
5617 }
5618 }
5619
5620 if (!legal) {
5621 ResourceMark rm(THREAD);
5622 assert(_class_name != NULL, "invariant");
5623 Exceptions::fthrow(
5624 THREAD_AND_LOCATION,
5625 vmSymbols::java_lang_ClassFormatError(),
5626 "Illegal method name \"%s\" in class %s", bytes,
5627 _class_name->as_C_string()
5628 );
5629 return;
5630 }
5631 }
5632
5633
5634 // Checks if signature is a legal field signature.
5635 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5636 const Symbol* signature,
5637 TRAPS) const {
5638 if (!_need_verify) { return; }
5639
5640 char buf[fixed_buffer_size];
5641 const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5642 const unsigned int length = signature->utf8_length();
5643 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5644
5645 if (p == NULL || (p - bytes) != (int)length) {
5646 throwIllegalSignature("Field", name, signature, CHECK);
5647 }
5648 }
5649
5650 // Checks if signature is a legal method signature.
5651 // Returns number of parameters
5652 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5653 const Symbol* signature,
5654 TRAPS) const {
5655 if (!_need_verify) {
5656 // make sure caller's args_size will be less than 0 even for non-static
5657 // method so it will be recomputed in compute_size_of_parameters().
5658 return -2;
5659 }
5660
5661 // Class initializers cannot have args for class format version >= 51.
5662 if (name == vmSymbols::class_initializer_name() &&
5663 signature != vmSymbols::void_method_signature() &&
5664 _major_version >= JAVA_7_VERSION) {
5665 throwIllegalSignature("Method", name, signature, CHECK_0);
5666 return 0;
5667 }
5668
5669 unsigned int args_size = 0;
5670 char buf[fixed_buffer_size];
5671 const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5672 unsigned int length = signature->utf8_length();
5673 const char* nextp;
5674
5675 // The first character must be a '('
5676 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5677 length--;
5678 // Skip over legal field signatures
5679 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5680 while ((length > 0) && (nextp != NULL)) {
5681 args_size++;
5682 if (p[0] == 'J' || p[0] == 'D') {
5683 args_size++;
5684 }
5685 length -= nextp - p;
5686 p = nextp;
5687 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5688 }
5689 // The first non-signature thing better be a ')'
5690 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5691 length--;
5692 if (name->utf8_length() > 0 && name->char_at(0) == '<') {
5693 // All internal methods must return void
5694 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5695 return args_size;
5696 }
5697 } else {
5698 // Now we better just have a return value
5699 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5700 if (nextp && ((int)length == (nextp - p))) {
5701 return args_size;
5702 }
5703 }
5704 }
5705 }
5706 // Report error
5707 throwIllegalSignature("Method", name, signature, CHECK_0);
5708 return 0;
5709 }
5710
5711 int ClassFileParser::static_field_size() const {
5712 assert(_field_info != NULL, "invariant");
5713 return _field_info->static_field_size;
5714 }
5715
5716 int ClassFileParser::total_oop_map_count() const {
5717 assert(_field_info != NULL, "invariant");
5718 return _field_info->oop_map_blocks->nonstatic_oop_map_count;
5719 }
5720
5721 jint ClassFileParser::layout_size() const {
5722 assert(_field_info != NULL, "invariant");
5723 return _field_info->instance_size;
5724 }
5725
5726 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5727 const Array<Method*>* methods) {
5728 assert(ik != NULL, "invariant");
5729 assert(methods != NULL, "invariant");
5730
5731 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5732 // (We used to do this lazily, but now we query it in Rewriter,
5733 // which is eagerly done for every method, so we might as well do it now,
5734 // when everything is fresh in memory.)
5735 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5736
5737 if (klass_id != vmSymbols::NO_SID) {
5738 for (int j = 0; j < methods->length(); ++j) {
5739 Method* method = methods->at(j);
5740 method->init_intrinsic_id();
5741
5742 if (CheckIntrinsics) {
5743 // Check if an intrinsic is defined for method 'method',
5744 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5745 if (method->intrinsic_id() != vmIntrinsics::_none &&
5746 !method->intrinsic_candidate()) {
5747 tty->print("Compiler intrinsic is defined for method [%s], "
5748 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5749 method->name_and_sig_as_C_string(),
5750 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5751 );
5752 tty->cr();
5753 DEBUG_ONLY(vm_exit(1));
5754 }
5755 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5756 // but there is no intrinsic available for it.
5757 if (method->intrinsic_candidate() &&
5758 method->intrinsic_id() == vmIntrinsics::_none) {
5759 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5760 "but no compiler intrinsic is defined for the method.%s",
5761 method->name_and_sig_as_C_string(),
5762 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5763 );
5764 tty->cr();
5765 DEBUG_ONLY(vm_exit(1));
5766 }
5767 }
5768 } // end for
5769
5770 #ifdef ASSERT
5771 if (CheckIntrinsics) {
5772 // Check for orphan methods in the current class. A method m
5773 // of a class C is orphan if an intrinsic is defined for method m,
5774 // but class C does not declare m.
5775 // The check is potentially expensive, therefore it is available
5776 // only in debug builds.
5777
5778 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5779 if (vmIntrinsics::_compiledLambdaForm == id) {
5780 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5781 // generated for the JVM from a LambdaForm and therefore no method
5782 // is defined for it.
5783 continue;
5784 }
5785
5786 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5787 // Check if the current class contains a method with the same
5788 // name, flags, signature.
5789 bool match = false;
5790 for (int j = 0; j < methods->length(); ++j) {
5791 const Method* method = methods->at(j);
5792 if (method->intrinsic_id() == id) {
5793 match = true;
5794 break;
5795 }
5796 }
5797
5798 if (!match) {
5799 char buf[1000];
5800 tty->print("Compiler intrinsic is defined for method [%s], "
5801 "but the method is not available in class [%s].%s",
5802 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5803 buf, sizeof(buf)),
5804 ik->name()->as_C_string(),
5805 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5806 );
5807 tty->cr();
5808 DEBUG_ONLY(vm_exit(1));
5809 }
5810 }
5811 } // end for
5812 } // CheckIntrinsics
5813 #endif // ASSERT
5814 }
5815 }
5816
5817 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5818 if (_klass != NULL) {
5819 return _klass;
5820 }
5821
5822 InstanceKlass* const ik =
5823 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5824
5825 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5826
5827 assert(_klass == ik, "invariant");
5828
5829
5830 if (ik->should_store_fingerprint()) {
5831 ik->store_fingerprint(_stream->compute_fingerprint());
5832 }
5833
5834 ik->set_has_passed_fingerprint_check(false);
5835 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5836 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5837 uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint();
5838 if (aot_fp != 0 && aot_fp == fp) {
5839 // This class matches with a class saved in an AOT library
5840 ik->set_has_passed_fingerprint_check(true);
5841 } else {
5842 ResourceMark rm;
5843 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5844 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5845 }
5846 }
5847
5848 if (ik->is_value()) {
5849 ValueKlass* vk = ValueKlass::cast(ik);
5850 oop val = ik->allocate_instance(CHECK_NULL);
5851 vk->set_default_value(val);
5852 }
5853
5854 return ik;
5855 }
5856
5857 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5858 assert(ik != NULL, "invariant");
5859
5860 // Set name and CLD before adding to CLD
5861 ik->set_class_loader_data(_loader_data);
5862 ik->set_name(_class_name);
5863
5864 // Add all classes to our internal class loader list here,
5865 // including classes in the bootstrap (NULL) class loader.
5866 const bool publicize = !is_internal();
5867
5868 _loader_data->add_class(ik, publicize);
5869
5870 set_klass_to_deallocate(ik);
5871
5872 assert(_field_info != NULL, "invariant");
5873 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5874 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->nonstatic_oop_map_count,
5875 "sanity");
5876
5877 assert(ik->is_instance_klass(), "sanity");
5878 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5879
5880 // Fill in information already parsed
5881 ik->set_should_verify_class(_need_verify);
5882
5883 // Not yet: supers are done below to support the new subtype-checking fields
5884 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5885 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5886 assert(_fac != NULL, "invariant");
5887 ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_FLATTENABLE]);
5888
5889 // this transfers ownership of a lot of arrays from
5890 // the parser onto the InstanceKlass*
5891 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5892
5893 // note that is not safe to use the fields in the parser from this point on
5894 assert(NULL == _cp, "invariant");
5895 assert(NULL == _fields, "invariant");
5896 assert(NULL == _methods, "invariant");
5897 assert(NULL == _inner_classes, "invariant");
5898 assert(NULL == _nest_members, "invariant");
5899 assert(NULL == _local_interfaces, "invariant");
5900 assert(NULL == _combined_annotations, "invariant");
5901
5902 if (_has_final_method) {
5903 ik->set_has_final_method();
5904 }
5905
5906 ik->copy_method_ordering(_method_ordering, CHECK);
5907 // The InstanceKlass::_methods_jmethod_ids cache
5908 // is managed on the assumption that the initial cache
5909 // size is equal to the number of methods in the class. If
5910 // that changes, then InstanceKlass::idnum_can_increment()
5911 // has to be changed accordingly.
5912 ik->set_initial_method_idnum(ik->methods()->length());
5913
5914 ik->set_this_class_index(_this_class_index);
5915
5916 if (is_unsafe_anonymous()) {
5917 // _this_class_index is a CONSTANT_Class entry that refers to this
5918 // anonymous class itself. If this class needs to refer to its own methods or
5919 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5920 // _this_class_index. However, because this class is anonymous (it's
5921 // not stored in SystemDictionary), _this_class_index cannot be resolved
5922 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5923 // Therefore, we must eagerly resolve _this_class_index now.
5924 ik->constants()->klass_at_put(_this_class_index, ik);
5925 }
5926
5927 ik->set_minor_version(_minor_version);
5928 ik->set_major_version(_major_version);
5929 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5930 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5931
5932 if (_unsafe_anonymous_host != NULL) {
5933 assert (ik->is_unsafe_anonymous(), "should be the same");
5934 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host);
5935 }
5936
5937 // Set PackageEntry for this_klass
5938 oop cl = ik->class_loader();
5939 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5940 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5941 ik->set_package(cld, CHECK);
5942
5943 const Array<Method*>* const methods = ik->methods();
5944 assert(methods != NULL, "invariant");
5945 const int methods_len = methods->length();
5946
5947 check_methods_for_intrinsics(ik, methods);
5948
5949 // Fill in field values obtained by parse_classfile_attributes
5950 if (_parsed_annotations->has_any_annotations()) {
5951 _parsed_annotations->apply_to(ik);
5952 }
5953
5954 apply_parsed_class_attributes(ik);
5955
5956 // Miranda methods
5957 if ((_num_miranda_methods > 0) ||
5958 // if this class introduced new miranda methods or
5959 (_super_klass != NULL && _super_klass->has_miranda_methods())
5960 // super class exists and this class inherited miranda methods
5961 ) {
5962 ik->set_has_miranda_methods(); // then set a flag
5963 }
5964
5965 // Fill in information needed to compute superclasses.
5966 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5967 ik->set_transitive_interfaces(_transitive_interfaces);
5968 _transitive_interfaces = NULL;
5969
5970 // Initialize itable offset tables
5971 klassItable::setup_itable_offset_table(ik);
5972
5973 // Compute transitive closure of interfaces this class implements
5974 // Do final class setup
5975 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5976 if (oop_map_blocks->nonstatic_oop_map_count > 0) {
5977 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5978 }
5979
5980 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5981 set_precomputed_flags(ik, CHECK);
5982
5983 // check if this class can access its super class
5984 check_super_class_access(ik, CHECK);
5985
5986 // check if this class can access its superinterfaces
5987 check_super_interface_access(ik, CHECK);
5988
5989 // check if this class overrides any final method
5990 check_final_method_override(ik, CHECK);
5991
5992 // reject static interface methods prior to Java 8
5993 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5994 check_illegal_static_method(ik, CHECK);
5995 }
5996
5997 // Obtain this_klass' module entry
5998 ModuleEntry* module_entry = ik->module();
5999 assert(module_entry != NULL, "module_entry should always be set");
6000
6001 // Obtain java.lang.Module
6002 Handle module_handle(THREAD, module_entry->module());
6003
6004 // Allocate mirror and initialize static fields
6005 // The create_mirror() call will also call compute_modifiers()
6006 java_lang_Class::create_mirror(ik,
6007 Handle(THREAD, _loader_data->class_loader()),
6008 module_handle,
6009 _protection_domain,
6010 CHECK);
6011
6012 assert(_all_mirandas != NULL, "invariant");
6013
6014 // Generate any default methods - default methods are public interface methods
6015 // that have a default implementation. This is new with Java 8.
6016 if (_has_nonstatic_concrete_methods) {
6017 DefaultMethods::generate_default_methods(ik,
6018 _all_mirandas,
6019 CHECK);
6020 }
6021
6022 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
6023 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
6024 !module_entry->has_default_read_edges()) {
6025 if (!module_entry->set_has_default_read_edges()) {
6026 // We won a potential race
6027 JvmtiExport::add_default_read_edges(module_handle, THREAD);
6028 }
6029 }
6030
6031 int nfields = ik->java_fields_count();
6032 if (ik->is_value()) nfields++;
6033 for (int i = 0; i < nfields; i++) {
6034 if (ik->field_access_flags(i) & JVM_ACC_FLATTENABLE) {
6035 Symbol* klass_name = ik->field_signature(i)->fundamental_name(CHECK);
6036 // Value classes must have been pre-loaded
6037 Klass* klass = SystemDictionary::find(klass_name,
6038 Handle(THREAD, ik->class_loader()),
6039 Handle(THREAD, ik->protection_domain()), CHECK);
6040 assert(klass != NULL, "Sanity check");
6041 assert(klass->access_flags().is_value_type(), "Value type expected");
6042 ik->set_value_field_klass(i, klass);
6043 klass_name->decrement_refcount();
6044 } else if (is_value_type() && ((ik->field_access_flags(i) & JVM_ACC_FIELD_INTERNAL) != 0)
6045 && ((ik->field_access_flags(i) & JVM_ACC_STATIC) != 0)) {
6046 ValueKlass::cast(ik)->set_default_value_offset(ik->field_offset(i));
6047 }
6048 }
6049
6050 if (is_value_type()) {
6051 ValueKlass::cast(ik)->initialize_calling_convention(CHECK);
6052 }
6053
6054 // Update the loader_data graph.
6055 record_defined_class_dependencies(ik, CHECK);
6056
6057 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
6058
6059 if (!is_internal()) {
6060 if (log_is_enabled(Info, class, load)) {
6061 ResourceMark rm;
6062 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
6063 ik->print_class_load_logging(_loader_data, module_name, _stream);
6064 }
6065
6066 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
6067 ik->major_version() != JAVA_MIN_SUPPORTED_VERSION &&
6068 log_is_enabled(Info, class, preview)) {
6069 ResourceMark rm;
6070 log_info(class, preview)("Loading preview feature type %s", ik->external_name());
6071 }
6072
6073 if (log_is_enabled(Debug, class, resolve)) {
6074 ResourceMark rm;
6075 // print out the superclass.
6076 const char * from = ik->external_name();
6077 if (ik->java_super() != NULL) {
6078 log_debug(class, resolve)("%s %s (super)",
6079 from,
6080 ik->java_super()->external_name());
6081 }
6082 // print out each of the interface classes referred to by this class.
6083 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
6084 if (local_interfaces != NULL) {
6085 const int length = local_interfaces->length();
6086 for (int i = 0; i < length; i++) {
6087 const InstanceKlass* const k = local_interfaces->at(i);
6088 const char * to = k->external_name();
6089 log_debug(class, resolve)("%s %s (interface)", from, to);
6090 }
6091 }
6092 }
6093 }
6094
6095 JFR_ONLY(INIT_ID(ik);)
6096
6097 // If we reach here, all is well.
6098 // Now remove the InstanceKlass* from the _klass_to_deallocate field
6099 // in order for it to not be destroyed in the ClassFileParser destructor.
6100 set_klass_to_deallocate(NULL);
6101
6102 // it's official
6103 set_klass(ik);
6104
6105 debug_only(ik->verify();)
6106 }
6107
6108 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's
6109 // package by prepending its host class's package name to its class name and setting
6110 // its _class_name field.
6111 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) {
6112 ResourceMark rm(THREAD);
6113 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
6114 "Unsafe anonymous class should not be in a package");
6115 const char* host_pkg_name =
6116 ClassLoader::package_from_name(unsafe_anonymous_host->name()->as_C_string(), NULL);
6117
6118 if (host_pkg_name != NULL) {
6119 size_t host_pkg_len = strlen(host_pkg_name);
6120 int class_name_len = _class_name->utf8_length();
6121 char* new_anon_name =
6122 NEW_RESOURCE_ARRAY(char, host_pkg_len + 1 + class_name_len);
6123 // Copy host package name and trailing /.
6124 strncpy(new_anon_name, host_pkg_name, host_pkg_len);
6125 new_anon_name[host_pkg_len] = '/';
6126 // Append unsafe anonymous class name. The unsafe anonymous class name can contain odd
6127 // characters. So, do a strncpy instead of using sprintf("%s...").
6128 strncpy(new_anon_name + host_pkg_len + 1, (char *)_class_name->base(), class_name_len);
6129
6130 // Create a symbol and update the anonymous class name.
6131 _class_name = SymbolTable::new_symbol(new_anon_name,
6132 (int)host_pkg_len + 1 + class_name_len,
6133 CHECK);
6134 }
6135 }
6136
6137 // If the host class and the anonymous class are in the same package then do
6138 // nothing. If the anonymous class is in the unnamed package then move it to its
6139 // host's package. If the classes are in different packages then throw an IAE
6140 // exception.
6141 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) {
6142 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class");
6143
6144 const jbyte* anon_last_slash = UTF8::strrchr((const jbyte*)_class_name->base(),
6145 _class_name->utf8_length(), '/');
6146 if (anon_last_slash == NULL) { // Unnamed package
6147 prepend_host_package_name(_unsafe_anonymous_host, CHECK);
6148 } else {
6149 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) {
6150 ResourceMark rm(THREAD);
6151 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
6152 err_msg("Host class %s and anonymous class %s are in different packages",
6153 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string()));
6154 }
6155 }
6156 }
6157
6158 static bool relax_format_check_for(ClassLoaderData* loader_data) {
6159 bool trusted = (loader_data->is_the_null_class_loader_data() ||
6160 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
6161 bool need_verify =
6162 // verifyAll
6163 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
6164 // verifyRemote
6165 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
6166 return !need_verify;
6167 }
6168
6169 ClassFileParser::ClassFileParser(ClassFileStream* stream,
6170 Symbol* name,
6171 ClassLoaderData* loader_data,
6172 Handle protection_domain,
6173 const InstanceKlass* unsafe_anonymous_host,
6174 GrowableArray<Handle>* cp_patches,
6175 Publicity pub_level,
6176 TRAPS) :
6177 _stream(stream),
6178 _requested_name(name),
6179 _loader_data(loader_data),
6180 _unsafe_anonymous_host(unsafe_anonymous_host),
6181 _cp_patches(cp_patches),
6182 _num_patched_klasses(0),
6183 _max_num_patched_klasses(0),
6184 _orig_cp_size(0),
6185 _first_patched_klass_resolved_index(0),
6186 _super_klass(),
6187 _cp(NULL),
6188 _fields(NULL),
6189 _methods(NULL),
6190 _inner_classes(NULL),
6191 _nest_members(NULL),
6192 _nest_host(0),
6193 _local_interfaces(NULL),
6194 _transitive_interfaces(NULL),
6195 _combined_annotations(NULL),
6196 _annotations(NULL),
6197 _type_annotations(NULL),
6198 _fields_annotations(NULL),
6199 _fields_type_annotations(NULL),
6200 _klass(NULL),
6201 _klass_to_deallocate(NULL),
6202 _parsed_annotations(NULL),
6203 _fac(NULL),
6204 _field_info(NULL),
6205 _method_ordering(NULL),
6206 _all_mirandas(NULL),
6207 _vtable_size(0),
6208 _itable_size(0),
6209 _num_miranda_methods(0),
6210 _rt(REF_NONE),
6211 _protection_domain(protection_domain),
6212 _access_flags(),
6213 _pub_level(pub_level),
6214 _bad_constant_seen(0),
6215 _synthetic_flag(false),
6216 _sde_length(false),
6217 _sde_buffer(NULL),
6218 _sourcefile_index(0),
6219 _generic_signature_index(0),
6220 _major_version(0),
6221 _minor_version(0),
6222 _this_class_index(0),
6223 _super_class_index(0),
6224 _itfs_len(0),
6225 _java_fields_count(0),
6226 _need_verify(false),
6227 _relax_verify(false),
6228 _has_nonstatic_concrete_methods(false),
6229 _declares_nonstatic_concrete_methods(false),
6230 _has_final_method(false),
6231 _has_flattenable_fields(false),
6232 _has_finalizer(false),
6233 _has_empty_finalizer(false),
6234 _has_vanilla_constructor(false),
6235 _max_bootstrap_specifier_index(-1) {
6236
6237 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6238
6239 assert(THREAD->is_Java_thread(), "invariant");
6240 assert(_loader_data != NULL, "invariant");
6241 assert(stream != NULL, "invariant");
6242 assert(_stream != NULL, "invariant");
6243 assert(_stream->buffer() == _stream->current(), "invariant");
6244 assert(_class_name != NULL, "invariant");
6245 assert(0 == _access_flags.as_int(), "invariant");
6246
6247 // Figure out whether we can skip format checking (matching classic VM behavior)
6248 if (DumpSharedSpaces) {
6249 // verify == true means it's a 'remote' class (i.e., non-boot class)
6250 // Verification decision is based on BytecodeVerificationRemote flag
6251 // for those classes.
6252 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
6253 BytecodeVerificationLocal;
6254 }
6255 else {
6256 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
6257 stream->need_verify());
6258 }
6259 if (_cp_patches != NULL) {
6260 int len = _cp_patches->length();
6261 for (int i=0; i<len; i++) {
6262 if (has_cp_patch_at(i)) {
6263 Handle patch = cp_patch_at(i);
6264 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
6265 // We need to append the names of the patched classes to the end of the constant pool,
6266 // because a patched class may have a Utf8 name that's not already included in the
6267 // original constant pool. These class names are used when patch_constant_pool()
6268 // calls patch_class().
6269 //
6270 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
6271 // At this point, we don't know the tag for index i yet, because we haven't parsed the
6272 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
6273 _max_num_patched_klasses++;
6274 }
6275 }
6276 }
6277 }
6278
6279 // synch back verification state to stream
6280 stream->set_verify(_need_verify);
6281
6282 // Check if verification needs to be relaxed for this class file
6283 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
6284 _relax_verify = relax_format_check_for(_loader_data);
6285
6286 parse_stream(stream, CHECK);
6287
6288 post_process_parsed_stream(stream, _cp, CHECK);
6289 }
6290
6291 void ClassFileParser::clear_class_metadata() {
6292 // metadata created before the instance klass is created. Must be
6293 // deallocated if classfile parsing returns an error.
6294 _cp = NULL;
6295 _fields = NULL;
6296 _methods = NULL;
6297 _inner_classes = NULL;
6298 _nest_members = NULL;
6299 _local_interfaces = NULL;
6300 _combined_annotations = NULL;
6301 _annotations = _type_annotations = NULL;
6302 _fields_annotations = _fields_type_annotations = NULL;
6303 }
6304
6305 // Destructor to clean up
6306 ClassFileParser::~ClassFileParser() {
6307 if (_cp != NULL) {
6308 MetadataFactory::free_metadata(_loader_data, _cp);
6309 }
6310 if (_fields != NULL) {
6311 MetadataFactory::free_array<u2>(_loader_data, _fields);
6312 }
6313
6314 if (_methods != NULL) {
6315 // Free methods
6316 InstanceKlass::deallocate_methods(_loader_data, _methods);
6317 }
6318
6319 // beware of the Universe::empty_blah_array!!
6320 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6321 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6322 }
6323
6324 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
6325 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6326 }
6327
6328 // Free interfaces
6329 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6330 _local_interfaces, _transitive_interfaces);
6331
6332 if (_combined_annotations != NULL) {
6333 // After all annotations arrays have been created, they are installed into the
6334 // Annotations object that will be assigned to the InstanceKlass being created.
6335
6336 // Deallocate the Annotations object and the installed annotations arrays.
6337 _combined_annotations->deallocate_contents(_loader_data);
6338
6339 // If the _combined_annotations pointer is non-NULL,
6340 // then the other annotations fields should have been cleared.
6341 assert(_annotations == NULL, "Should have been cleared");
6342 assert(_type_annotations == NULL, "Should have been cleared");
6343 assert(_fields_annotations == NULL, "Should have been cleared");
6344 assert(_fields_type_annotations == NULL, "Should have been cleared");
6345 } else {
6346 // If the annotations arrays were not installed into the Annotations object,
6347 // then they have to be deallocated explicitly.
6348 MetadataFactory::free_array<u1>(_loader_data, _annotations);
6349 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
6350 Annotations::free_contents(_loader_data, _fields_annotations);
6351 Annotations::free_contents(_loader_data, _fields_type_annotations);
6352 }
6353
6354 clear_class_metadata();
6355 _transitive_interfaces = NULL;
6356
6357 // deallocate the klass if already created. Don't directly deallocate, but add
6358 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6359 // at a safepoint.
6360 if (_klass_to_deallocate != NULL) {
6361 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6362 }
6363 }
6364
6365 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6366 TRAPS) {
6367
6368 assert(stream != NULL, "invariant");
6369 assert(_class_name != NULL, "invariant");
6370
6371 // BEGIN STREAM PARSING
6372 stream->guarantee_more(8, CHECK); // magic, major, minor
6373 // Magic value
6374 const u4 magic = stream->get_u4_fast();
6375 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6376 "Incompatible magic value %u in class file %s",
6377 magic, CHECK);
6378
6379 // Version numbers
6380 _minor_version = stream->get_u2_fast();
6381 _major_version = stream->get_u2_fast();
6382
6383 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) {
6384 ResourceMark rm;
6385 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
6386 _major_version, _minor_version, _class_name->as_C_string());
6387 Exceptions::fthrow(
6388 THREAD_AND_LOCATION,
6389 vmSymbols::java_lang_UnsupportedClassVersionError(),
6390 "Unsupported major.minor version for dump time %u.%u",
6391 _major_version,
6392 _minor_version);
6393 }
6394
6395 // Check version numbers - we check this even with verifier off
6396 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6397
6398 stream->guarantee_more(3, CHECK); // length, first cp tag
6399 u2 cp_size = stream->get_u2_fast();
6400
6401 guarantee_property(
6402 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6403 cp_size, CHECK);
6404
6405 _orig_cp_size = cp_size;
6406 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6407 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6408 }
6409 cp_size += _max_num_patched_klasses;
6410
6411 _cp = ConstantPool::allocate(_loader_data,
6412 cp_size,
6413 CHECK);
6414
6415 ConstantPool* const cp = _cp;
6416
6417 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6418
6419 assert(cp_size == (const u2)cp->length(), "invariant");
6420
6421 // ACCESS FLAGS
6422 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6423
6424 jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
6425 // JVM_ACC_MODULE is defined in JDK-9 and later.
6426 if (_major_version >= JAVA_9_VERSION) {
6427 recognized_modifiers |= JVM_ACC_MODULE;
6428 }
6429 // JVM_ACC_VALUE is defined for class file version 55 and later
6430 if (supports_value_types()) {
6431 recognized_modifiers |= JVM_ACC_VALUE;
6432 }
6433
6434 // Access flags
6435 jint flags = stream->get_u2_fast() & recognized_modifiers;
6436
6437 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6438 // Set abstract bit for old class files for backward compatibility
6439 flags |= JVM_ACC_ABSTRACT;
6440 }
6441
6442 verify_legal_class_modifiers(flags, CHECK);
6443
6444 short bad_constant = class_bad_constant_seen();
6445 if (bad_constant != 0) {
6446 // Do not throw CFE until after the access_flags are checked because if
6447 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6448 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6449 }
6450
6451 _access_flags.set_flags(flags);
6452
6453 // This class and superclass
6454 _this_class_index = stream->get_u2_fast();
6455 check_property(
6456 valid_cp_range(_this_class_index, cp_size) &&
6457 cp->tag_at(_this_class_index).is_unresolved_klass(),
6458 "Invalid this class index %u in constant pool in class file %s",
6459 _this_class_index, CHECK);
6460
6461 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6462 assert(class_name_in_cp != NULL, "class_name can't be null");
6463
6464 // Update _class_name which could be null previously
6465 // to reflect the name in the constant pool
6466 _class_name = class_name_in_cp;
6467
6468 // Don't need to check whether this class name is legal or not.
6469 // It has been checked when constant pool is parsed.
6470 // However, make sure it is not an array type.
6471 if (_need_verify) {
6472 guarantee_property(_class_name->char_at(0) != JVM_SIGNATURE_ARRAY,
6473 "Bad class name in class file %s",
6474 CHECK);
6475 }
6476
6477 // Checks if name in class file matches requested name
6478 if (_requested_name != NULL && _requested_name != _class_name) {
6479 ResourceMark rm(THREAD);
6480 Exceptions::fthrow(
6481 THREAD_AND_LOCATION,
6482 vmSymbols::java_lang_NoClassDefFoundError(),
6483 "%s (wrong name: %s)",
6484 _class_name->as_C_string(),
6485 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6486 );
6487 return;
6488 }
6489
6490 // if this is an anonymous class fix up its name if it's in the unnamed
6491 // package. Otherwise, throw IAE if it is in a different package than
6492 // its host class.
6493 if (_unsafe_anonymous_host != NULL) {
6494 fix_unsafe_anonymous_class_name(CHECK);
6495 }
6496
6497 // Verification prevents us from creating names with dots in them, this
6498 // asserts that that's the case.
6499 assert(is_internal_format(_class_name), "external class name format used internally");
6500
6501 if (!is_internal()) {
6502 LogTarget(Debug, class, preorder) lt;
6503 if (lt.is_enabled()){
6504 ResourceMark rm(THREAD);
6505 LogStream ls(lt);
6506 ls.print("%s", _class_name->as_klass_external_name());
6507 if (stream->source() != NULL) {
6508 ls.print(" source: %s", stream->source());
6509 }
6510 ls.cr();
6511 }
6512
6513 #if INCLUDE_CDS
6514 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6515 if (!ClassLoader::has_jrt_entry()) {
6516 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6517 DumpLoadedClassList = NULL;
6518 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6519 _unsafe_anonymous_host == NULL) {
6520 // Only dump the classes that can be stored into CDS archive.
6521 // Unsafe anonymous classes such as generated LambdaForm classes are also not included.
6522 oop class_loader = _loader_data->class_loader();
6523 ResourceMark rm(THREAD);
6524 bool skip = false;
6525 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6526 // For the boot and platform class loaders, skip classes that are not found in the
6527 // java runtime image, such as those found in the --patch-module entries.
6528 // These classes can't be loaded from the archive during runtime.
6529 if (!ClassLoader::is_modules_image(stream->source()) && strncmp(stream->source(), "jrt:", 4) != 0) {
6530 skip = true;
6531 }
6532
6533 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6534 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6535 // as they can be loaded from the archive during runtime.
6536 skip = false;
6537 }
6538 }
6539 if (skip) {
6540 tty->print_cr("skip writing class %s from source %s to classlist file",
6541 _class_name->as_C_string(), stream->source());
6542 } else {
6543 classlist_file->print_cr("%s", _class_name->as_C_string());
6544 classlist_file->flush();
6545 }
6546 }
6547 }
6548 #endif
6549 }
6550
6551 // SUPERKLASS
6552 _super_class_index = stream->get_u2_fast();
6553 _super_klass = parse_super_class(cp,
6554 _super_class_index,
6555 _need_verify,
6556 CHECK);
6557
6558 // Interfaces
6559 _itfs_len = stream->get_u2_fast();
6560 parse_interfaces(stream,
6561 _itfs_len,
6562 cp,
6563 &_has_nonstatic_concrete_methods,
6564 CHECK);
6565
6566 assert(_local_interfaces != NULL, "invariant");
6567
6568 // Fields (offsets are filled in later)
6569 _fac = new FieldAllocationCount();
6570 parse_fields(stream,
6571 _access_flags.is_interface(),
6572 _access_flags.is_value_type(),
6573 _fac,
6574 cp,
6575 cp_size,
6576 &_java_fields_count,
6577 CHECK);
6578
6579 assert(_fields != NULL, "invariant");
6580
6581 // Methods
6582 AccessFlags promoted_flags;
6583 parse_methods(stream,
6584 _access_flags.is_interface(),
6585 _access_flags.is_value_type(),
6586 &promoted_flags,
6587 &_has_final_method,
6588 &_declares_nonstatic_concrete_methods,
6589 CHECK);
6590
6591 assert(_methods != NULL, "invariant");
6592
6593 // promote flags from parse_methods() to the klass' flags
6594 _access_flags.add_promoted_flags(promoted_flags.as_int());
6595
6596 if (_declares_nonstatic_concrete_methods) {
6597 _has_nonstatic_concrete_methods = true;
6598 }
6599
6600 // Additional attributes/annotations
6601 _parsed_annotations = new ClassAnnotationCollector();
6602 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6603
6604 assert(_inner_classes != NULL, "invariant");
6605
6606 // Finalize the Annotations metadata object,
6607 // now that all annotation arrays have been created.
6608 create_combined_annotations(CHECK);
6609
6610 // Make sure this is the end of class file stream
6611 guarantee_property(stream->at_eos(),
6612 "Extra bytes at the end of class file %s",
6613 CHECK);
6614
6615 // all bytes in stream read and parsed
6616 }
6617
6618 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6619 ConstantPool* cp,
6620 TRAPS) {
6621 assert(stream != NULL, "invariant");
6622 assert(stream->at_eos(), "invariant");
6623 assert(cp != NULL, "invariant");
6624 assert(_loader_data != NULL, "invariant");
6625
6626 if (_class_name == vmSymbols::java_lang_Object()) {
6627 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6628 "java.lang.Object cannot implement an interface in class file %s",
6629 CHECK);
6630 }
6631 // We check super class after class file is parsed and format is checked
6632 if (_super_class_index > 0 && NULL ==_super_klass) {
6633 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6634 if (_access_flags.is_interface()) {
6635 // Before attempting to resolve the superclass, check for class format
6636 // errors not checked yet.
6637 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6638 "Interfaces must have java.lang.Object as superclass in class file %s",
6639 CHECK);
6640 }
6641 Handle loader(THREAD, _loader_data->class_loader());
6642 _super_klass = (const InstanceKlass*)
6643 SystemDictionary::resolve_super_or_fail(_class_name,
6644 super_class_name,
6645 loader,
6646 _protection_domain,
6647 true,
6648 CHECK);
6649 }
6650
6651 if (_super_klass != NULL) {
6652 if (_super_klass->has_nonstatic_concrete_methods()) {
6653 _has_nonstatic_concrete_methods = true;
6654 }
6655
6656 if (_super_klass->is_interface()) {
6657 ResourceMark rm(THREAD);
6658 Exceptions::fthrow(
6659 THREAD_AND_LOCATION,
6660 vmSymbols::java_lang_IncompatibleClassChangeError(),
6661 "class %s has interface %s as super class",
6662 _class_name->as_klass_external_name(),
6663 _super_klass->external_name()
6664 );
6665 return;
6666 }
6667
6668 // For a value class, only java/lang/Object is an acceptable super class
6669 if (_access_flags.get_flags() & JVM_ACC_VALUE) {
6670 guarantee_property(_super_klass->name() == vmSymbols::java_lang_Object(),
6671 "Value type must have java.lang.Object as superclass in class file %s",
6672 CHECK);
6673 }
6674
6675 // Make sure super class is not final
6676 if (_super_klass->is_final()) {
6677 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6678 }
6679 }
6680
6681 // Compute the transitive list of all unique interfaces implemented by this class
6682 _transitive_interfaces =
6683 compute_transitive_interfaces(_super_klass,
6684 _local_interfaces,
6685 _loader_data,
6686 CHECK);
6687
6688 assert(_transitive_interfaces != NULL, "invariant");
6689
6690 // sort methods
6691 _method_ordering = sort_methods(_methods);
6692
6693 _all_mirandas = new GrowableArray<Method*>(20);
6694
6695 Handle loader(THREAD, _loader_data->class_loader());
6696 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6697 &_num_miranda_methods,
6698 _all_mirandas,
6699 _super_klass,
6700 _methods,
6701 _access_flags,
6702 _major_version,
6703 loader,
6704 _class_name,
6705 _local_interfaces,
6706 CHECK);
6707
6708 // Size of Java itable (in words)
6709 _itable_size = _access_flags.is_interface() ? 0 :
6710 klassItable::compute_itable_size(_transitive_interfaces);
6711
6712 assert(_fac != NULL, "invariant");
6713 assert(_parsed_annotations != NULL, "invariant");
6714
6715
6716 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
6717 if (fs.is_flattenable()) {
6718 // Pre-load value class
6719 Klass* klass = SystemDictionary::resolve_flattenable_field_or_fail(&fs,
6720 Handle(THREAD, _loader_data->class_loader()),
6721 _protection_domain, true, CHECK);
6722 assert(klass != NULL, "Sanity check");
6723 assert(klass->access_flags().is_value_type(), "Value type expected");
6724 _has_flattenable_fields = true;
6725 }
6726 }
6727
6728 _field_info = new FieldLayoutInfo();
6729 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6730
6731 // Compute reference typ
6732 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6733
6734 }
6735
6736 void ClassFileParser::set_klass(InstanceKlass* klass) {
6737
6738 #ifdef ASSERT
6739 if (klass != NULL) {
6740 assert(NULL == _klass, "leaking?");
6741 }
6742 #endif
6743
6744 _klass = klass;
6745 }
6746
6747 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6748
6749 #ifdef ASSERT
6750 if (klass != NULL) {
6751 assert(NULL == _klass_to_deallocate, "leaking?");
6752 }
6753 #endif
6754
6755 _klass_to_deallocate = klass;
6756 }
6757
6758 // Caller responsible for ResourceMark
6759 // clone stream with rewound position
6760 const ClassFileStream* ClassFileParser::clone_stream() const {
6761 assert(_stream != NULL, "invariant");
6762
6763 return _stream->clone();
6764 }
6765
6766 // ----------------------------------------------------------------------------
6767 // debugging
6768
6769 #ifdef ASSERT
6770
6771 // return true if class_name contains no '.' (internal format is '/')
6772 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6773 if (class_name != NULL) {
6774 ResourceMark rm;
6775 char* name = class_name->as_C_string();
6776 return strchr(name, '.') == NULL;
6777 } else {
6778 return true;
6779 }
6780 }
6781
6782 #endif