1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24 #include "precompiled.hpp"
25 #include "jvm.h"
26 #include "aot/aotLoader.hpp"
27 #include "classfile/classFileParser.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/defaultMethods.hpp"
32 #include "classfile/dictionary.hpp"
33 #include "classfile/javaClasses.inline.hpp"
34 #include "classfile/moduleEntry.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/verificationType.hpp"
39 #include "classfile/verifier.hpp"
40 #include "classfile/vmSymbols.hpp"
41 #include "logging/log.hpp"
42 #include "logging/logStream.hpp"
43 #include "memory/allocation.hpp"
44 #include "memory/metadataFactory.hpp"
45 #include "memory/oopFactory.hpp"
46 #include "memory/resourceArea.hpp"
47 #include "memory/universe.hpp"
48 #include "oops/annotations.hpp"
49 #include "oops/constantPool.inline.hpp"
50 #include "oops/fieldStreams.hpp"
51 #include "oops/instanceKlass.hpp"
52 #include "oops/instanceMirrorKlass.hpp"
53 #include "oops/klass.inline.hpp"
54 #include "oops/klassVtable.hpp"
55 #include "oops/metadata.hpp"
56 #include "oops/method.inline.hpp"
57 #include "oops/oop.inline.hpp"
58 #include "oops/symbol.hpp"
59 #include "oops/valueKlass.hpp"
60 #include "prims/jvmtiExport.hpp"
61 #include "prims/jvmtiThreadState.hpp"
62 #include "runtime/arguments.hpp"
63 #include "runtime/handles.inline.hpp"
64 #include "runtime/javaCalls.hpp"
65 #include "runtime/os.hpp"
66 #include "runtime/perfData.hpp"
67 #include "runtime/reflection.hpp"
68 #include "runtime/safepointVerifiers.hpp"
69 #include "runtime/signature.hpp"
70 #include "runtime/timer.hpp"
71 #include "services/classLoadingService.hpp"
72 #include "services/threadService.hpp"
73 #include "utilities/align.hpp"
74 #include "utilities/bitMap.inline.hpp"
75 #include "utilities/copy.hpp"
76 #include "utilities/exceptions.hpp"
77 #include "utilities/globalDefinitions.hpp"
78 #include "utilities/growableArray.hpp"
79 #include "utilities/macros.hpp"
80 #include "utilities/ostream.hpp"
81 #include "utilities/resourceHash.hpp"
82 #include "utilities/utf8.hpp"
83
84 #if INCLUDE_CDS
85 #include "classfile/systemDictionaryShared.hpp"
86 #endif
87 #if INCLUDE_JFR
88 #include "jfr/support/jfrTraceIdExtension.hpp"
89 #endif
90
91 // We generally try to create the oops directly when parsing, rather than
92 // allocating temporary data structures and copying the bytes twice. A
93 // temporary area is only needed when parsing utf8 entries in the constant
94 // pool and when parsing line number tables.
95
96 // We add assert in debug mode when class format is not checked.
97
98 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
99 #define JAVA_MIN_SUPPORTED_VERSION 45
100 #define JAVA_PREVIEW_MINOR_VERSION 65535
101
102 // Used for two backward compatibility reasons:
103 // - to check for new additions to the class file format in JDK1.5
104 // - to check for bug fixes in the format checker in JDK1.5
105 #define JAVA_1_5_VERSION 49
106
107 // Used for backward compatibility reasons:
108 // - to check for javac bug fixes that happened after 1.5
109 // - also used as the max version when running in jdk6
110 #define JAVA_6_VERSION 50
111
112 // Used for backward compatibility reasons:
113 // - to disallow argument and require ACC_STATIC for <clinit> methods
114 #define JAVA_7_VERSION 51
115
116 // Extension method support.
117 #define JAVA_8_VERSION 52
118
119 #define JAVA_9_VERSION 53
120
121 #define JAVA_10_VERSION 54
122
123 #define JAVA_11_VERSION 55
124
125 #define JAVA_12_VERSION 56
126
127 #define JAVA_13_VERSION 57
128
129 #define JAVA_14_VERSION 58
130
131 #define CONSTANT_CLASS_DESCRIPTORS 58
132
133 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
134 assert((bad_constant == JVM_CONSTANT_Module ||
135 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
136 "Unexpected bad constant pool entry");
137 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
138 }
139
140 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
141 ConstantPool* cp,
142 const int length,
143 TRAPS) {
144 assert(stream != NULL, "invariant");
145 assert(cp != NULL, "invariant");
146
147 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
148 // this function (_current can be allocated in a register, with scalar
149 // replacement of aggregates). The _current pointer is copied back to
150 // stream() when this function returns. DON'T call another method within
151 // this method that uses stream().
152 const ClassFileStream cfs1 = *stream;
153 const ClassFileStream* const cfs = &cfs1;
154
155 assert(cfs->allocated_on_stack(), "should be local");
156 debug_only(const u1* const old_current = stream->current();)
157
158 // Used for batching symbol allocations.
159 const char* names[SymbolTable::symbol_alloc_batch_size];
160 int lengths[SymbolTable::symbol_alloc_batch_size];
161 int indices[SymbolTable::symbol_alloc_batch_size];
162 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
163 int names_count = 0;
164
165 // parsing Index 0 is unused
166 for (int index = 1; index < length; index++) {
167 // Each of the following case guarantees one more byte in the stream
168 // for the following tag or the access_flags following constant pool,
169 // so we don't need bounds-check for reading tag.
170 const u1 tag = cfs->get_u1_fast();
171 switch (tag) {
172 case JVM_CONSTANT_Class: {
173 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
174 const u2 name_index = cfs->get_u2_fast();
175 cp->klass_index_at_put(index, name_index);
176 break;
177 }
178 case JVM_CONSTANT_Fieldref: {
179 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
180 const u2 class_index = cfs->get_u2_fast();
181 const u2 name_and_type_index = cfs->get_u2_fast();
182 cp->field_at_put(index, class_index, name_and_type_index);
183 break;
184 }
185 case JVM_CONSTANT_Methodref: {
186 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
187 const u2 class_index = cfs->get_u2_fast();
188 const u2 name_and_type_index = cfs->get_u2_fast();
189 cp->method_at_put(index, class_index, name_and_type_index);
190 break;
191 }
192 case JVM_CONSTANT_InterfaceMethodref: {
193 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
194 const u2 class_index = cfs->get_u2_fast();
195 const u2 name_and_type_index = cfs->get_u2_fast();
196 cp->interface_method_at_put(index, class_index, name_and_type_index);
197 break;
198 }
199 case JVM_CONSTANT_String : {
200 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
201 const u2 string_index = cfs->get_u2_fast();
202 cp->string_index_at_put(index, string_index);
203 break;
204 }
205 case JVM_CONSTANT_MethodHandle :
206 case JVM_CONSTANT_MethodType: {
207 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
208 classfile_parse_error(
209 "Class file version does not support constant tag %u in class file %s",
210 tag, CHECK);
211 }
212 if (tag == JVM_CONSTANT_MethodHandle) {
213 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
214 const u1 ref_kind = cfs->get_u1_fast();
215 const u2 method_index = cfs->get_u2_fast();
216 cp->method_handle_index_at_put(index, ref_kind, method_index);
217 }
218 else if (tag == JVM_CONSTANT_MethodType) {
219 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
220 const u2 signature_index = cfs->get_u2_fast();
221 cp->method_type_index_at_put(index, signature_index);
222 }
223 else {
224 ShouldNotReachHere();
225 }
226 break;
227 }
228 case JVM_CONSTANT_Dynamic : {
229 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
230 classfile_parse_error(
231 "Class file version does not support constant tag %u in class file %s",
232 tag, CHECK);
233 }
234 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
235 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
236 const u2 name_and_type_index = cfs->get_u2_fast();
237 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
238 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
239 }
240 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
241 break;
242 }
243 case JVM_CONSTANT_InvokeDynamic : {
244 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
245 classfile_parse_error(
246 "Class file version does not support constant tag %u in class file %s",
247 tag, CHECK);
248 }
249 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
250 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
251 const u2 name_and_type_index = cfs->get_u2_fast();
252 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
253 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
254 }
255 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
256 break;
257 }
258 case JVM_CONSTANT_Integer: {
259 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
260 const u4 bytes = cfs->get_u4_fast();
261 cp->int_at_put(index, (jint)bytes);
262 break;
263 }
264 case JVM_CONSTANT_Float: {
265 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
266 const u4 bytes = cfs->get_u4_fast();
267 cp->float_at_put(index, *(jfloat*)&bytes);
268 break;
269 }
270 case JVM_CONSTANT_Long: {
271 // A mangled type might cause you to overrun allocated memory
272 guarantee_property(index + 1 < length,
273 "Invalid constant pool entry %u in class file %s",
274 index,
275 CHECK);
276 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
277 const u8 bytes = cfs->get_u8_fast();
278 cp->long_at_put(index, bytes);
279 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
280 break;
281 }
282 case JVM_CONSTANT_Double: {
283 // A mangled type might cause you to overrun allocated memory
284 guarantee_property(index+1 < length,
285 "Invalid constant pool entry %u in class file %s",
286 index,
287 CHECK);
288 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
289 const u8 bytes = cfs->get_u8_fast();
290 cp->double_at_put(index, *(jdouble*)&bytes);
291 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
292 break;
293 }
294 case JVM_CONSTANT_NameAndType: {
295 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
296 const u2 name_index = cfs->get_u2_fast();
297 const u2 signature_index = cfs->get_u2_fast();
298 cp->name_and_type_at_put(index, name_index, signature_index);
299 break;
300 }
301 case JVM_CONSTANT_Utf8 : {
302 cfs->guarantee_more(2, CHECK); // utf8_length
303 u2 utf8_length = cfs->get_u2_fast();
304 const u1* utf8_buffer = cfs->current();
305 assert(utf8_buffer != NULL, "null utf8 buffer");
306 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
307 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
308 cfs->skip_u1_fast(utf8_length);
309
310 // Before storing the symbol, make sure it's legal
311 if (_need_verify) {
312 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
313 }
314
315 if (has_cp_patch_at(index)) {
316 Handle patch = clear_cp_patch_at(index);
317 guarantee_property(java_lang_String::is_instance(patch()),
318 "Illegal utf8 patch at %d in class file %s",
319 index,
320 CHECK);
321 const char* const str = java_lang_String::as_utf8_string(patch());
322 // (could use java_lang_String::as_symbol instead, but might as well batch them)
323 utf8_buffer = (const u1*) str;
324 utf8_length = (u2) strlen(str);
325 }
326
327 unsigned int hash;
328 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
329 utf8_length,
330 hash);
331 if (result == NULL) {
332 names[names_count] = (const char*)utf8_buffer;
333 lengths[names_count] = utf8_length;
334 indices[names_count] = index;
335 hashValues[names_count++] = hash;
336 if (names_count == SymbolTable::symbol_alloc_batch_size) {
337 SymbolTable::new_symbols(_loader_data,
338 cp,
339 names_count,
340 names,
341 lengths,
342 indices,
343 hashValues);
344 names_count = 0;
345 }
346 } else {
347 cp->symbol_at_put(index, result);
348 }
349 break;
350 }
351 case JVM_CONSTANT_Module:
352 case JVM_CONSTANT_Package: {
353 // Record that an error occurred in these two cases but keep parsing so
354 // that ACC_Module can be checked for in the access_flags. Need to
355 // throw NoClassDefFoundError in that case.
356 if (_major_version >= JAVA_9_VERSION) {
357 cfs->guarantee_more(3, CHECK);
358 cfs->get_u2_fast();
359 set_class_bad_constant_seen(tag);
360 break;
361 }
362 }
363 default: {
364 classfile_parse_error("Unknown constant tag %u in class file %s",
365 tag,
366 CHECK);
367 break;
368 }
369 } // end of switch(tag)
370 } // end of for
371
372 // Allocate the remaining symbols
373 if (names_count > 0) {
374 SymbolTable::new_symbols(_loader_data,
375 cp,
376 names_count,
377 names,
378 lengths,
379 indices,
380 hashValues);
381 }
382
383 // Copy _current pointer of local copy back to stream.
384 assert(stream->current() == old_current, "non-exclusive use of stream");
385 stream->set_current(cfs1.current());
386
387 }
388
389 static inline bool valid_cp_range(int index, int length) {
390 return (index > 0 && index < length);
391 }
392
393 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
394 assert(cp != NULL, "invariant");
395 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
396 return cp->symbol_at(index);
397 }
398 return NULL;
399 }
400
401 #ifdef ASSERT
402 PRAGMA_DIAG_PUSH
403 PRAGMA_FORMAT_NONLITERAL_IGNORED
404 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
405 ResourceMark rm(THREAD);
406 fatal(msg, _class_name->as_C_string());
407 }
408
409 void ClassFileParser::report_assert_property_failure(const char* msg,
410 int index,
411 TRAPS) const {
412 ResourceMark rm(THREAD);
413 fatal(msg, index, _class_name->as_C_string());
414 }
415 PRAGMA_DIAG_POP
416 #endif
417
418 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
419 ConstantPool* const cp,
420 const int length,
421 TRAPS) {
422 assert(cp != NULL, "invariant");
423 assert(stream != NULL, "invariant");
424
425 // parsing constant pool entries
426 parse_constant_pool_entries(stream, cp, length, CHECK);
427 if (class_bad_constant_seen() != 0) {
428 // a bad CP entry has been detected previously so stop parsing and just return.
429 return;
430 }
431
432 int index = 1; // declared outside of loops for portability
433 int num_klasses = 0;
434
435 // first verification pass - validate cross references
436 // and fixup class and string constants
437 for (index = 1; index < length; index++) { // Index 0 is unused
438 const jbyte tag = cp->tag_at(index).value();
439 switch (tag) {
440 case JVM_CONSTANT_Class: {
441 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
442 break;
443 }
444 case JVM_CONSTANT_Fieldref:
445 // fall through
446 case JVM_CONSTANT_Methodref:
447 // fall through
448 case JVM_CONSTANT_InterfaceMethodref: {
449 if (!_need_verify) break;
450 const int klass_ref_index = cp->klass_ref_index_at(index);
451 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
452 check_property(valid_klass_reference_at(klass_ref_index),
453 "Invalid constant pool index %u in class file %s",
454 klass_ref_index, CHECK);
455 check_property(valid_cp_range(name_and_type_ref_index, length) &&
456 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
457 "Invalid constant pool index %u in class file %s",
458 name_and_type_ref_index, CHECK);
459 break;
460 }
461 case JVM_CONSTANT_String: {
462 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
463 break;
464 }
465 case JVM_CONSTANT_Integer:
466 break;
467 case JVM_CONSTANT_Float:
468 break;
469 case JVM_CONSTANT_Long:
470 case JVM_CONSTANT_Double: {
471 index++;
472 check_property(
473 (index < length && cp->tag_at(index).is_invalid()),
474 "Improper constant pool long/double index %u in class file %s",
475 index, CHECK);
476 break;
477 }
478 case JVM_CONSTANT_NameAndType: {
479 if (!_need_verify) break;
480 const int name_ref_index = cp->name_ref_index_at(index);
481 const int signature_ref_index = cp->signature_ref_index_at(index);
482 check_property(valid_symbol_at(name_ref_index),
483 "Invalid constant pool index %u in class file %s",
484 name_ref_index, CHECK);
485 check_property(valid_symbol_at(signature_ref_index),
486 "Invalid constant pool index %u in class file %s",
487 signature_ref_index, CHECK);
488 break;
489 }
490 case JVM_CONSTANT_Utf8:
491 break;
492 case JVM_CONSTANT_UnresolvedClass: // fall-through
493 case JVM_CONSTANT_UnresolvedClassInError: {
494 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
495 break;
496 }
497 case JVM_CONSTANT_ClassIndex: {
498 const int class_index = cp->klass_index_at(index);
499 check_property(valid_symbol_at(class_index),
500 "Invalid constant pool index %u in class file %s",
501 class_index, CHECK);
502
503 Symbol* const name = cp->symbol_at(class_index);
504 const unsigned int name_len = name->utf8_length();
505 if (name->is_Q_signature()) {
506 cp->unresolved_qdescriptor_at_put(index, class_index, num_klasses++);
507 } else {
508 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
509 }
510 break;
511 }
512 case JVM_CONSTANT_StringIndex: {
513 const int string_index = cp->string_index_at(index);
514 check_property(valid_symbol_at(string_index),
515 "Invalid constant pool index %u in class file %s",
516 string_index, CHECK);
517 Symbol* const sym = cp->symbol_at(string_index);
518 cp->unresolved_string_at_put(index, sym);
519 break;
520 }
521 case JVM_CONSTANT_MethodHandle: {
522 const int ref_index = cp->method_handle_index_at(index);
523 check_property(valid_cp_range(ref_index, length),
524 "Invalid constant pool index %u in class file %s",
525 ref_index, CHECK);
526 const constantTag tag = cp->tag_at(ref_index);
527 const int ref_kind = cp->method_handle_ref_kind_at(index);
528
529 switch (ref_kind) {
530 case JVM_REF_getField:
531 case JVM_REF_getStatic:
532 case JVM_REF_putField:
533 case JVM_REF_putStatic: {
534 check_property(
535 tag.is_field(),
536 "Invalid constant pool index %u in class file %s (not a field)",
537 ref_index, CHECK);
538 break;
539 }
540 case JVM_REF_invokeVirtual:
541 case JVM_REF_newInvokeSpecial: {
542 check_property(
543 tag.is_method(),
544 "Invalid constant pool index %u in class file %s (not a method)",
545 ref_index, CHECK);
546 break;
547 }
548 case JVM_REF_invokeStatic:
549 case JVM_REF_invokeSpecial: {
550 check_property(
551 tag.is_method() ||
552 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
553 "Invalid constant pool index %u in class file %s (not a method)",
554 ref_index, CHECK);
555 break;
556 }
557 case JVM_REF_invokeInterface: {
558 check_property(
559 tag.is_interface_method(),
560 "Invalid constant pool index %u in class file %s (not an interface method)",
561 ref_index, CHECK);
562 break;
563 }
564 default: {
565 classfile_parse_error(
566 "Bad method handle kind at constant pool index %u in class file %s",
567 index, CHECK);
568 }
569 } // switch(refkind)
570 // Keep the ref_index unchanged. It will be indirected at link-time.
571 break;
572 } // case MethodHandle
573 case JVM_CONSTANT_MethodType: {
574 const int ref_index = cp->method_type_index_at(index);
575 check_property(valid_symbol_at(ref_index),
576 "Invalid constant pool index %u in class file %s",
577 ref_index, CHECK);
578 break;
579 }
580 case JVM_CONSTANT_Dynamic: {
581 const int name_and_type_ref_index =
582 cp->bootstrap_name_and_type_ref_index_at(index);
583
584 check_property(valid_cp_range(name_and_type_ref_index, length) &&
585 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
586 "Invalid constant pool index %u in class file %s",
587 name_and_type_ref_index, CHECK);
588 // bootstrap specifier index must be checked later,
589 // when BootstrapMethods attr is available
590
591 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
592 cp->set_has_dynamic_constant();
593 break;
594 }
595 case JVM_CONSTANT_InvokeDynamic: {
596 const int name_and_type_ref_index =
597 cp->bootstrap_name_and_type_ref_index_at(index);
598
599 check_property(valid_cp_range(name_and_type_ref_index, length) &&
600 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
601 "Invalid constant pool index %u in class file %s",
602 name_and_type_ref_index, CHECK);
603 // bootstrap specifier index must be checked later,
604 // when BootstrapMethods attr is available
605 break;
606 }
607 default: {
608 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
609 ShouldNotReachHere();
610 break;
611 }
612 } // switch(tag)
613 } // end of for
614
615 _first_patched_klass_resolved_index = num_klasses;
616 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
617
618 if (_cp_patches != NULL) {
619 // need to treat this_class specially...
620
621 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
622 // for now. These will be replaced with actual names of the patched classes in patch_class().
623 Symbol* s = vmSymbols::star_name();
624 for (int n=_orig_cp_size; n<cp->length(); n++) {
625 cp->symbol_at_put(n, s);
626 }
627
628 int this_class_index;
629 {
630 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
631 const u1* const mark = stream->current();
632 stream->skip_u2_fast(1); // skip flags
633 this_class_index = stream->get_u2_fast();
634 stream->set_current(mark); // revert to mark
635 }
636
637 for (index = 1; index < length; index++) { // Index 0 is unused
638 if (has_cp_patch_at(index)) {
639 guarantee_property(index != this_class_index,
640 "Illegal constant pool patch to self at %d in class file %s",
641 index, CHECK);
642 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
643 }
644 }
645 }
646
647 if (!_need_verify) {
648 return;
649 }
650
651 // second verification pass - checks the strings are of the right format.
652 // but not yet to the other entries
653 for (index = 1; index < length; index++) {
654 const jbyte tag = cp->tag_at(index).value();
655 switch (tag) {
656 case JVM_CONSTANT_UnresolvedClass: {
657 const Symbol* const class_name = cp->klass_name_at(index);
658 // check the name, even if _cp_patches will overwrite it
659 verify_legal_class_name(class_name, CHECK);
660 break;
661 }
662 case JVM_CONSTANT_NameAndType: {
663 if (_need_verify) {
664 const int sig_index = cp->signature_ref_index_at(index);
665 const int name_index = cp->name_ref_index_at(index);
666 const Symbol* const name = cp->symbol_at(name_index);
667 const Symbol* const sig = cp->symbol_at(sig_index);
668 guarantee_property(sig->utf8_length() != 0,
669 "Illegal zero length constant pool entry at %d in class %s",
670 sig_index, CHECK);
671 guarantee_property(name->utf8_length() != 0,
672 "Illegal zero length constant pool entry at %d in class %s",
673 name_index, CHECK);
674
675 if (sig->char_at(0) == JVM_SIGNATURE_FUNC) {
676 // Format check method name and signature
677 verify_legal_method_name(name, CHECK);
678 verify_legal_method_signature(name, sig, CHECK);
679 } else {
680 // Format check field name and signature
681 verify_legal_field_name(name, CHECK);
682 verify_legal_field_signature(name, sig, CHECK);
683 }
684 }
685 break;
686 }
687 case JVM_CONSTANT_Dynamic: {
688 const int name_and_type_ref_index =
689 cp->name_and_type_ref_index_at(index);
690 // already verified to be utf8
691 const int name_ref_index =
692 cp->name_ref_index_at(name_and_type_ref_index);
693 // already verified to be utf8
694 const int signature_ref_index =
695 cp->signature_ref_index_at(name_and_type_ref_index);
696 const Symbol* const name = cp->symbol_at(name_ref_index);
697 const Symbol* const signature = cp->symbol_at(signature_ref_index);
698 if (_need_verify) {
699 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
700 // Need only to be sure signature is non-zero length and the right type.
701 if (signature->utf8_length() == 0 ||
702 signature->char_at(0) == JVM_SIGNATURE_FUNC) {
703 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
704 }
705 }
706 break;
707 }
708 case JVM_CONSTANT_InvokeDynamic:
709 case JVM_CONSTANT_Fieldref:
710 case JVM_CONSTANT_Methodref:
711 case JVM_CONSTANT_InterfaceMethodref: {
712 const int name_and_type_ref_index =
713 cp->name_and_type_ref_index_at(index);
714 // already verified to be utf8
715 const int name_ref_index =
716 cp->name_ref_index_at(name_and_type_ref_index);
717 // already verified to be utf8
718 const int signature_ref_index =
719 cp->signature_ref_index_at(name_and_type_ref_index);
720 const Symbol* const name = cp->symbol_at(name_ref_index);
721 const Symbol* const signature = cp->symbol_at(signature_ref_index);
722 if (tag == JVM_CONSTANT_Fieldref) {
723 if (_need_verify) {
724 // Field name and signature are verified above, when iterating NameAndType_info.
725 // Need only to be sure signature is non-zero length and the right type.
726 if (signature->utf8_length() == 0 ||
727 signature->char_at(0) == JVM_SIGNATURE_FUNC) {
728 throwIllegalSignature("Field", name, signature, CHECK);
729 }
730 }
731 } else {
732 if (_need_verify) {
733 // Method name and signature are verified above, when iterating NameAndType_info.
734 // Need only to be sure signature is non-zero length and the right type.
735 if (signature->utf8_length() == 0 ||
736 signature->char_at(0) != JVM_SIGNATURE_FUNC) {
737 throwIllegalSignature("Method", name, signature, CHECK);
738 }
739 }
740 // 4509014: If a class method name begins with '<', it must be "<init>"
741 const unsigned int name_len = name->utf8_length();
742 if (tag == JVM_CONSTANT_Methodref &&
743 name_len != 0 &&
744 name->char_at(0) == '<' &&
745 name != vmSymbols::object_initializer_name()) {
746 classfile_parse_error(
747 "Bad method name at constant pool index %u in class file %s",
748 name_ref_index, CHECK);
749 }
750 }
751 break;
752 }
753 case JVM_CONSTANT_MethodHandle: {
754 const int ref_index = cp->method_handle_index_at(index);
755 const int ref_kind = cp->method_handle_ref_kind_at(index);
756 switch (ref_kind) {
757 case JVM_REF_invokeVirtual:
758 case JVM_REF_invokeStatic:
759 case JVM_REF_invokeSpecial:
760 case JVM_REF_newInvokeSpecial: {
761 const int name_and_type_ref_index =
762 cp->name_and_type_ref_index_at(ref_index);
763 const int name_ref_index =
764 cp->name_ref_index_at(name_and_type_ref_index);
765 const Symbol* const name = cp->symbol_at(name_ref_index);
766 if (name != vmSymbols::object_initializer_name()) {
767 if (ref_kind == JVM_REF_newInvokeSpecial) {
768 classfile_parse_error(
769 "Bad constructor name at constant pool index %u in class file %s",
770 name_ref_index, CHECK);
771 }
772 } else {
773 // The allowed invocation mode of <init> depends on its signature.
774 // This test corresponds to verify_invoke_instructions in the verifier.
775 const int signature_ref_index =
776 cp->signature_ref_index_at(name_and_type_ref_index);
777 const Symbol* const signature = cp->symbol_at(signature_ref_index);
778 if (signature->is_void_method_signature()
779 && ref_kind == JVM_REF_newInvokeSpecial) {
780 // OK, could be a constructor call
781 } else if (!signature->is_void_method_signature()
782 && ref_kind == JVM_REF_invokeStatic) {
783 // also OK, could be a static factory call
784 } else {
785 classfile_parse_error(
786 "Bad method name at constant pool index %u in class file %s",
787 name_ref_index, CHECK);
788 }
789 }
790 break;
791 }
792 // Other ref_kinds are already fully checked in previous pass.
793 } // switch(ref_kind)
794 break;
795 }
796 case JVM_CONSTANT_MethodType: {
797 const Symbol* const no_name = vmSymbols::type_name(); // place holder
798 const Symbol* const signature = cp->method_type_signature_at(index);
799 verify_legal_method_signature(no_name, signature, CHECK);
800 break;
801 }
802 case JVM_CONSTANT_Utf8: {
803 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
804 }
805 } // switch(tag)
806 } // end of for
807 }
808
809 Handle ClassFileParser::clear_cp_patch_at(int index) {
810 Handle patch = cp_patch_at(index);
811 _cp_patches->at_put(index, Handle());
812 assert(!has_cp_patch_at(index), "");
813 return patch;
814 }
815
816 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
817 int name_index = _orig_cp_size + _num_patched_klasses;
818 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
819
820 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
821 _num_patched_klasses ++;
822 }
823
824 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
825 int index,
826 Handle patch,
827 TRAPS) {
828 assert(cp != NULL, "invariant");
829
830 BasicType patch_type = T_VOID;
831
832 switch (cp->tag_at(index).value()) {
833
834 case JVM_CONSTANT_UnresolvedClass: {
835 // Patching a class means pre-resolving it.
836 // The name in the constant pool is ignored.
837 if (java_lang_Class::is_instance(patch())) {
838 guarantee_property(!java_lang_Class::is_primitive(patch()),
839 "Illegal class patch at %d in class file %s",
840 index, CHECK);
841 Klass* k = java_lang_Class::as_Klass(patch());
842 patch_class(cp, index, k, k->name());
843 } else {
844 guarantee_property(java_lang_String::is_instance(patch()),
845 "Illegal class patch at %d in class file %s",
846 index, CHECK);
847 Symbol* const name = java_lang_String::as_symbol(patch());
848 patch_class(cp, index, NULL, name);
849 }
850 break;
851 }
852
853 case JVM_CONSTANT_String: {
854 // skip this patch and don't clear it. Needs the oop array for resolved
855 // references to be created first.
856 return;
857 }
858 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
859 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
860 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
861 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
862 patch_prim:
863 {
864 jvalue value;
865 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
866 guarantee_property(value_type == patch_type,
867 "Illegal primitive patch at %d in class file %s",
868 index, CHECK);
869 switch (value_type) {
870 case T_INT: cp->int_at_put(index, value.i); break;
871 case T_FLOAT: cp->float_at_put(index, value.f); break;
872 case T_LONG: cp->long_at_put(index, value.j); break;
873 case T_DOUBLE: cp->double_at_put(index, value.d); break;
874 default: assert(false, "");
875 }
876 } // end patch_prim label
877 break;
878
879 default: {
880 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
881 guarantee_property(!has_cp_patch_at(index),
882 "Illegal unexpected patch at %d in class file %s",
883 index, CHECK);
884 return;
885 }
886 } // end of switch(tag)
887
888 // On fall-through, mark the patch as used.
889 clear_cp_patch_at(index);
890 }
891 class NameSigHash: public ResourceObj {
892 public:
893 const Symbol* _name; // name
894 const Symbol* _sig; // signature
895 NameSigHash* _next; // Next entry in hash table
896 };
897
898 static const int HASH_ROW_SIZE = 256;
899
900 static unsigned int hash(const Symbol* name, const Symbol* sig) {
901 unsigned int raw_hash = 0;
902 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
903 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
904
905 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
906 }
907
908
909 static void initialize_hashtable(NameSigHash** table) {
910 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
911 }
912 // Return false if the name/sig combination is found in table.
913 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
914 // The old format checker uses heap sort to find duplicates.
915 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
916 // of table since we don't expect Symbol*'s to move.
917 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
918 assert(name != NULL, "name in constant pool is NULL");
919
920 // First lookup for duplicates
921 int index = hash(name, sig);
922 NameSigHash* entry = table[index];
923 while (entry != NULL) {
924 if (entry->_name == name && entry->_sig == sig) {
925 return false;
926 }
927 entry = entry->_next;
928 }
929
930 // No duplicate is found, allocate a new entry and fill it.
931 entry = new NameSigHash();
932 entry->_name = name;
933 entry->_sig = sig;
934
935 // Insert into hash table
936 entry->_next = table[index];
937 table[index] = entry;
938
939 return true;
940 }
941
942 // Side-effects: populates the _local_interfaces field
943 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
944 const int itfs_len,
945 ConstantPool* const cp,
946 bool* const has_nonstatic_concrete_methods,
947 TRAPS) {
948 assert(stream != NULL, "invariant");
949 assert(cp != NULL, "invariant");
950 assert(has_nonstatic_concrete_methods != NULL, "invariant");
951
952 if (itfs_len == 0) {
953 _local_interfaces = Universe::the_empty_instance_klass_array();
954 } else {
955 assert(itfs_len > 0, "only called for len>0");
956 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
957
958 int index;
959 for (index = 0; index < itfs_len; index++) {
960 const u2 interface_index = stream->get_u2(CHECK);
961 Klass* interf;
962 check_property(
963 valid_klass_reference_at(interface_index),
964 "Interface name has bad constant pool index %u in class file %s",
965 interface_index, CHECK);
966 if (cp->tag_at(interface_index).is_klass()) {
967 interf = cp->resolved_klass_at(interface_index);
968 } else {
969 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
970
971 // Don't need to check legal name because it's checked when parsing constant pool.
972 // But need to make sure it's not an array type.
973 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
974 "Bad interface name in class file %s", CHECK);
975
976 // Call resolve_super so classcircularity is checked
977 interf = SystemDictionary::resolve_super_or_fail(
978 _class_name,
979 unresolved_klass,
980 Handle(THREAD, _loader_data->class_loader()),
981 _protection_domain,
982 false,
983 CHECK);
984 }
985
986 if (!interf->is_interface()) {
987 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
988 err_msg("class %s can not implement %s, because it is not an interface (%s)",
989 _class_name->as_klass_external_name(),
990 interf->external_name(),
991 interf->class_in_module_of_loader()));
992 }
993
994 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
995 *has_nonstatic_concrete_methods = true;
996 }
997 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
998 }
999
1000 if (!_need_verify || itfs_len <= 1) {
1001 return;
1002 }
1003
1004 // Check if there's any duplicates in interfaces
1005 ResourceMark rm(THREAD);
1006 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1007 NameSigHash*,
1008 HASH_ROW_SIZE);
1009 initialize_hashtable(interface_names);
1010 bool dup = false;
1011 const Symbol* name = NULL;
1012 {
1013 debug_only(NoSafepointVerifier nsv;)
1014 for (index = 0; index < itfs_len; index++) {
1015 const InstanceKlass* const k = _local_interfaces->at(index);
1016 name = k->name();
1017 // If no duplicates, add (name, NULL) in hashtable interface_names.
1018 if (!put_after_lookup(name, NULL, interface_names)) {
1019 dup = true;
1020 break;
1021 }
1022 }
1023 }
1024 if (dup) {
1025 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
1026 name->as_C_string(), CHECK);
1027 }
1028 }
1029 }
1030
1031 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
1032 int constantvalue_index,
1033 int signature_index,
1034 TRAPS) const {
1035 // Make sure the constant pool entry is of a type appropriate to this field
1036 guarantee_property(
1037 (constantvalue_index > 0 &&
1038 constantvalue_index < cp->length()),
1039 "Bad initial value index %u in ConstantValue attribute in class file %s",
1040 constantvalue_index, CHECK);
1041
1042 const constantTag value_type = cp->tag_at(constantvalue_index);
1043 switch(cp->basic_type_for_signature_at(signature_index)) {
1044 case T_LONG: {
1045 guarantee_property(value_type.is_long(),
1046 "Inconsistent constant value type in class file %s",
1047 CHECK);
1048 break;
1049 }
1050 case T_FLOAT: {
1051 guarantee_property(value_type.is_float(),
1052 "Inconsistent constant value type in class file %s",
1053 CHECK);
1054 break;
1055 }
1056 case T_DOUBLE: {
1057 guarantee_property(value_type.is_double(),
1058 "Inconsistent constant value type in class file %s",
1059 CHECK);
1060 break;
1061 }
1062 case T_BYTE:
1063 case T_CHAR:
1064 case T_SHORT:
1065 case T_BOOLEAN:
1066 case T_INT: {
1067 guarantee_property(value_type.is_int(),
1068 "Inconsistent constant value type in class file %s",
1069 CHECK);
1070 break;
1071 }
1072 case T_OBJECT: {
1073 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1074 && value_type.is_string()),
1075 "Bad string initial value in class file %s",
1076 CHECK);
1077 break;
1078 }
1079 default: {
1080 classfile_parse_error("Unable to set initial value %u in class file %s",
1081 constantvalue_index,
1082 CHECK);
1083 }
1084 }
1085 }
1086
1087 class AnnotationCollector : public ResourceObj{
1088 public:
1089 enum Location { _in_field, _in_method, _in_class };
1090 enum ID {
1091 _unknown = 0,
1092 _method_CallerSensitive,
1093 _method_ForceInline,
1094 _method_DontInline,
1095 _method_InjectedProfile,
1096 _method_LambdaForm_Compiled,
1097 _method_Hidden,
1098 _method_HotSpotIntrinsicCandidate,
1099 _jdk_internal_vm_annotation_Contended,
1100 _field_Stable,
1101 _jdk_internal_vm_annotation_ReservedStackAccess,
1102 _annotation_LIMIT
1103 };
1104 const Location _location;
1105 int _annotations_present;
1106 u2 _contended_group;
1107
1108 AnnotationCollector(Location location)
1109 : _location(location), _annotations_present(0)
1110 {
1111 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1112 }
1113 // If this annotation name has an ID, report it (or _none).
1114 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1115 // Set the annotation name:
1116 void set_annotation(ID id) {
1117 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1118 _annotations_present |= nth_bit((int)id);
1119 }
1120
1121 void remove_annotation(ID id) {
1122 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1123 _annotations_present &= ~nth_bit((int)id);
1124 }
1125
1126 // Report if the annotation is present.
1127 bool has_any_annotations() const { return _annotations_present != 0; }
1128 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1129
1130 void set_contended_group(u2 group) { _contended_group = group; }
1131 u2 contended_group() const { return _contended_group; }
1132
1133 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1134
1135 void set_stable(bool stable) { set_annotation(_field_Stable); }
1136 bool is_stable() const { return has_annotation(_field_Stable); }
1137 };
1138
1139 // This class also doubles as a holder for metadata cleanup.
1140 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1141 private:
1142 ClassLoaderData* _loader_data;
1143 AnnotationArray* _field_annotations;
1144 AnnotationArray* _field_type_annotations;
1145 public:
1146 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1147 AnnotationCollector(_in_field),
1148 _loader_data(loader_data),
1149 _field_annotations(NULL),
1150 _field_type_annotations(NULL) {}
1151 ~FieldAnnotationCollector();
1152 void apply_to(FieldInfo* f);
1153 AnnotationArray* field_annotations() { return _field_annotations; }
1154 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1155
1156 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1157 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1158 };
1159
1160 class MethodAnnotationCollector : public AnnotationCollector{
1161 public:
1162 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1163 void apply_to(const methodHandle& m);
1164 };
1165
1166 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1167 public:
1168 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1169 void apply_to(InstanceKlass* ik);
1170 };
1171
1172
1173 static int skip_annotation_value(const u1*, int, int); // fwd decl
1174
1175 // Safely increment index by val if does not pass limit
1176 #define SAFE_ADD(index, limit, val) \
1177 if (index >= limit - val) return limit; \
1178 index += val;
1179
1180 // Skip an annotation. Return >=limit if there is any problem.
1181 static int skip_annotation(const u1* buffer, int limit, int index) {
1182 assert(buffer != NULL, "invariant");
1183 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1184 // value := switch (tag:u1) { ... }
1185 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1186 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1187 while (--nmem >= 0 && index < limit) {
1188 SAFE_ADD(index, limit, 2); // skip member
1189 index = skip_annotation_value(buffer, limit, index);
1190 }
1191 return index;
1192 }
1193
1194 // Skip an annotation value. Return >=limit if there is any problem.
1195 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1196 assert(buffer != NULL, "invariant");
1197
1198 // value := switch (tag:u1) {
1199 // case B, C, I, S, Z, D, F, J, c: con:u2;
1200 // case e: e_class:u2 e_name:u2;
1201 // case s: s_con:u2;
1202 // case [: do(nval:u2) {value};
1203 // case @: annotation;
1204 // case s: s_con:u2;
1205 // }
1206 SAFE_ADD(index, limit, 1); // read tag
1207 const u1 tag = buffer[index - 1];
1208 switch (tag) {
1209 case 'B':
1210 case 'C':
1211 case 'I':
1212 case 'S':
1213 case 'Z':
1214 case 'D':
1215 case 'F':
1216 case 'J':
1217 case 'c':
1218 case 's':
1219 SAFE_ADD(index, limit, 2); // skip con or s_con
1220 break;
1221 case 'e':
1222 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1223 break;
1224 case '[':
1225 {
1226 SAFE_ADD(index, limit, 2); // read nval
1227 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1228 while (--nval >= 0 && index < limit) {
1229 index = skip_annotation_value(buffer, limit, index);
1230 }
1231 }
1232 break;
1233 case '@':
1234 index = skip_annotation(buffer, limit, index);
1235 break;
1236 default:
1237 return limit; // bad tag byte
1238 }
1239 return index;
1240 }
1241
1242 // Sift through annotations, looking for those significant to the VM:
1243 static void parse_annotations(const ConstantPool* const cp,
1244 const u1* buffer, int limit,
1245 AnnotationCollector* coll,
1246 ClassLoaderData* loader_data,
1247 TRAPS) {
1248
1249 assert(cp != NULL, "invariant");
1250 assert(buffer != NULL, "invariant");
1251 assert(coll != NULL, "invariant");
1252 assert(loader_data != NULL, "invariant");
1253
1254 // annotations := do(nann:u2) {annotation}
1255 int index = 2; // read nann
1256 if (index >= limit) return;
1257 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1258 enum { // initial annotation layout
1259 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1260 count_off = 2, // u2 such as 1 (one value)
1261 member_off = 4, // utf8 such as 'value'
1262 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1263 e_tag_val = 'e',
1264 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1265 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1266 e_size = 11, // end of 'e' annotation
1267 c_tag_val = 'c', // payload is type
1268 c_con_off = 7, // utf8 payload, such as 'I'
1269 c_size = 9, // end of 'c' annotation
1270 s_tag_val = 's', // payload is String
1271 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1272 s_size = 9,
1273 min_size = 6 // smallest possible size (zero members)
1274 };
1275 // Cannot add min_size to index in case of overflow MAX_INT
1276 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1277 int index0 = index;
1278 index = skip_annotation(buffer, limit, index);
1279 const u1* const abase = buffer + index0;
1280 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1281 const int count = Bytes::get_Java_u2((address)abase + count_off);
1282 const Symbol* const aname = check_symbol_at(cp, atype);
1283 if (aname == NULL) break; // invalid annotation name
1284 const Symbol* member = NULL;
1285 if (count >= 1) {
1286 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1287 member = check_symbol_at(cp, member_index);
1288 if (member == NULL) break; // invalid member name
1289 }
1290
1291 // Here is where parsing particular annotations will take place.
1292 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1293 if (AnnotationCollector::_unknown == id) continue;
1294 coll->set_annotation(id);
1295
1296 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1297 // @Contended can optionally specify the contention group.
1298 //
1299 // Contended group defines the equivalence class over the fields:
1300 // the fields within the same contended group are not treated distinct.
1301 // The only exception is default group, which does not incur the
1302 // equivalence. Naturally, contention group for classes is meaningless.
1303 //
1304 // While the contention group is specified as String, annotation
1305 // values are already interned, and we might as well use the constant
1306 // pool index as the group tag.
1307 //
1308 u2 group_index = 0; // default contended group
1309 if (count == 1
1310 && s_size == (index - index0) // match size
1311 && s_tag_val == *(abase + tag_off)
1312 && member == vmSymbols::value_name()) {
1313 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1314 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1315 group_index = 0; // default contended group
1316 }
1317 }
1318 coll->set_contended_group(group_index);
1319 }
1320 }
1321 }
1322
1323
1324 // Parse attributes for a field.
1325 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1326 u2 attributes_count,
1327 bool is_static, u2 signature_index,
1328 u2* const constantvalue_index_addr,
1329 bool* const is_synthetic_addr,
1330 u2* const generic_signature_index_addr,
1331 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1332 TRAPS) {
1333 assert(cfs != NULL, "invariant");
1334 assert(constantvalue_index_addr != NULL, "invariant");
1335 assert(is_synthetic_addr != NULL, "invariant");
1336 assert(generic_signature_index_addr != NULL, "invariant");
1337 assert(parsed_annotations != NULL, "invariant");
1338 assert(attributes_count > 0, "attributes_count should be greater than 0");
1339
1340 u2 constantvalue_index = 0;
1341 u2 generic_signature_index = 0;
1342 bool is_synthetic = false;
1343 const u1* runtime_visible_annotations = NULL;
1344 int runtime_visible_annotations_length = 0;
1345 const u1* runtime_invisible_annotations = NULL;
1346 int runtime_invisible_annotations_length = 0;
1347 const u1* runtime_visible_type_annotations = NULL;
1348 int runtime_visible_type_annotations_length = 0;
1349 const u1* runtime_invisible_type_annotations = NULL;
1350 int runtime_invisible_type_annotations_length = 0;
1351 bool runtime_invisible_annotations_exists = false;
1352 bool runtime_invisible_type_annotations_exists = false;
1353 const ConstantPool* const cp = _cp;
1354
1355 while (attributes_count--) {
1356 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1357 const u2 attribute_name_index = cfs->get_u2_fast();
1358 const u4 attribute_length = cfs->get_u4_fast();
1359 check_property(valid_symbol_at(attribute_name_index),
1360 "Invalid field attribute index %u in class file %s",
1361 attribute_name_index,
1362 CHECK);
1363
1364 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1365 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1366 // ignore if non-static
1367 if (constantvalue_index != 0) {
1368 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1369 }
1370 check_property(
1371 attribute_length == 2,
1372 "Invalid ConstantValue field attribute length %u in class file %s",
1373 attribute_length, CHECK);
1374
1375 constantvalue_index = cfs->get_u2(CHECK);
1376 if (_need_verify) {
1377 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1378 }
1379 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1380 if (attribute_length != 0) {
1381 classfile_parse_error(
1382 "Invalid Synthetic field attribute length %u in class file %s",
1383 attribute_length, CHECK);
1384 }
1385 is_synthetic = true;
1386 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1387 if (attribute_length != 0) {
1388 classfile_parse_error(
1389 "Invalid Deprecated field attribute length %u in class file %s",
1390 attribute_length, CHECK);
1391 }
1392 } else if (_major_version >= JAVA_1_5_VERSION) {
1393 if (attribute_name == vmSymbols::tag_signature()) {
1394 if (generic_signature_index != 0) {
1395 classfile_parse_error(
1396 "Multiple Signature attributes for field in class file %s", CHECK);
1397 }
1398 if (attribute_length != 2) {
1399 classfile_parse_error(
1400 "Wrong size %u for field's Signature attribute in class file %s",
1401 attribute_length, CHECK);
1402 }
1403 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1404 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1405 if (runtime_visible_annotations != NULL) {
1406 classfile_parse_error(
1407 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1408 }
1409 runtime_visible_annotations_length = attribute_length;
1410 runtime_visible_annotations = cfs->current();
1411 assert(runtime_visible_annotations != NULL, "null visible annotations");
1412 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1413 parse_annotations(cp,
1414 runtime_visible_annotations,
1415 runtime_visible_annotations_length,
1416 parsed_annotations,
1417 _loader_data,
1418 CHECK);
1419 cfs->skip_u1_fast(runtime_visible_annotations_length);
1420 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1421 if (runtime_invisible_annotations_exists) {
1422 classfile_parse_error(
1423 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1424 }
1425 runtime_invisible_annotations_exists = true;
1426 if (PreserveAllAnnotations) {
1427 runtime_invisible_annotations_length = attribute_length;
1428 runtime_invisible_annotations = cfs->current();
1429 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1430 }
1431 cfs->skip_u1(attribute_length, CHECK);
1432 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1433 if (runtime_visible_type_annotations != NULL) {
1434 classfile_parse_error(
1435 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1436 }
1437 runtime_visible_type_annotations_length = attribute_length;
1438 runtime_visible_type_annotations = cfs->current();
1439 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1440 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1441 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1442 if (runtime_invisible_type_annotations_exists) {
1443 classfile_parse_error(
1444 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1445 } else {
1446 runtime_invisible_type_annotations_exists = true;
1447 }
1448 if (PreserveAllAnnotations) {
1449 runtime_invisible_type_annotations_length = attribute_length;
1450 runtime_invisible_type_annotations = cfs->current();
1451 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1452 }
1453 cfs->skip_u1(attribute_length, CHECK);
1454 } else {
1455 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1456 }
1457 } else {
1458 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1459 }
1460 }
1461
1462 *constantvalue_index_addr = constantvalue_index;
1463 *is_synthetic_addr = is_synthetic;
1464 *generic_signature_index_addr = generic_signature_index;
1465 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1466 runtime_visible_annotations_length,
1467 runtime_invisible_annotations,
1468 runtime_invisible_annotations_length,
1469 CHECK);
1470 parsed_annotations->set_field_annotations(a);
1471 a = assemble_annotations(runtime_visible_type_annotations,
1472 runtime_visible_type_annotations_length,
1473 runtime_invisible_type_annotations,
1474 runtime_invisible_type_annotations_length,
1475 CHECK);
1476 parsed_annotations->set_field_type_annotations(a);
1477 return;
1478 }
1479
1480
1481 // Field allocation types. Used for computing field offsets.
1482
1483 enum FieldAllocationType {
1484 STATIC_OOP, // Oops
1485 STATIC_BYTE, // Boolean, Byte, char
1486 STATIC_SHORT, // shorts
1487 STATIC_WORD, // ints
1488 STATIC_DOUBLE, // aligned long or double
1489 STATIC_FLATTENABLE, // flattenable field
1490 NONSTATIC_OOP,
1491 NONSTATIC_BYTE,
1492 NONSTATIC_SHORT,
1493 NONSTATIC_WORD,
1494 NONSTATIC_DOUBLE,
1495 NONSTATIC_FLATTENABLE,
1496 MAX_FIELD_ALLOCATION_TYPE,
1497 BAD_ALLOCATION_TYPE = -1
1498 };
1499
1500 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1501 BAD_ALLOCATION_TYPE, // 0
1502 BAD_ALLOCATION_TYPE, // 1
1503 BAD_ALLOCATION_TYPE, // 2
1504 BAD_ALLOCATION_TYPE, // 3
1505 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1506 NONSTATIC_SHORT, // T_CHAR = 5,
1507 NONSTATIC_WORD, // T_FLOAT = 6,
1508 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1509 NONSTATIC_BYTE, // T_BYTE = 8,
1510 NONSTATIC_SHORT, // T_SHORT = 9,
1511 NONSTATIC_WORD, // T_INT = 10,
1512 NONSTATIC_DOUBLE, // T_LONG = 11,
1513 NONSTATIC_OOP, // T_OBJECT = 12,
1514 NONSTATIC_OOP, // T_ARRAY = 13,
1515 NONSTATIC_OOP, // T_VALUETYPE = 14,
1516 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1517 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1518 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1519 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1520 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1521 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20,
1522 BAD_ALLOCATION_TYPE, // 0
1523 BAD_ALLOCATION_TYPE, // 1
1524 BAD_ALLOCATION_TYPE, // 2
1525 BAD_ALLOCATION_TYPE, // 3
1526 STATIC_BYTE , // T_BOOLEAN = 4,
1527 STATIC_SHORT, // T_CHAR = 5,
1528 STATIC_WORD, // T_FLOAT = 6,
1529 STATIC_DOUBLE, // T_DOUBLE = 7,
1530 STATIC_BYTE, // T_BYTE = 8,
1531 STATIC_SHORT, // T_SHORT = 9,
1532 STATIC_WORD, // T_INT = 10,
1533 STATIC_DOUBLE, // T_LONG = 11,
1534 STATIC_OOP, // T_OBJECT = 12,
1535 STATIC_OOP, // T_ARRAY = 13,
1536 STATIC_OOP, // T_VALUETYPE = 14,
1537 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1538 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1539 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1540 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1541 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1542 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20
1543 };
1544
1545 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type, bool is_flattenable) {
1546 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1547 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1548 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1549 if (is_flattenable) {
1550 result = is_static ? STATIC_FLATTENABLE : NONSTATIC_FLATTENABLE;
1551 }
1552 return result;
1553 }
1554
1555 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1556 public:
1557 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1558
1559 FieldAllocationCount() {
1560 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1561 count[i] = 0;
1562 }
1563 }
1564
1565 FieldAllocationType update(bool is_static, BasicType type, bool is_flattenable) {
1566 FieldAllocationType atype = basic_type_to_atype(is_static, type, is_flattenable);
1567 if (atype != BAD_ALLOCATION_TYPE) {
1568 // Make sure there is no overflow with injected fields.
1569 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1570 count[atype]++;
1571 }
1572 return atype;
1573 }
1574 };
1575
1576 // Side-effects: populates the _fields, _fields_annotations,
1577 // _fields_type_annotations fields
1578 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1579 bool is_interface,
1580 bool is_value_type,
1581 FieldAllocationCount* const fac,
1582 ConstantPool* cp,
1583 const int cp_size,
1584 u2* const java_fields_count_ptr,
1585 TRAPS) {
1586
1587 assert(cfs != NULL, "invariant");
1588 assert(fac != NULL, "invariant");
1589 assert(cp != NULL, "invariant");
1590 assert(java_fields_count_ptr != NULL, "invariant");
1591
1592 assert(NULL == _fields, "invariant");
1593 assert(NULL == _fields_annotations, "invariant");
1594 assert(NULL == _fields_type_annotations, "invariant");
1595
1596 cfs->guarantee_more(2, CHECK); // length
1597 const u2 length = cfs->get_u2_fast();
1598 *java_fields_count_ptr = length;
1599
1600 int num_injected = 0;
1601 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1602 &num_injected);
1603
1604 const int total_fields = length + num_injected + (is_value_type ? 1 : 0);
1605
1606 // The field array starts with tuples of shorts
1607 // [access, name index, sig index, initial value index, byte offset].
1608 // A generic signature slot only exists for field with generic
1609 // signature attribute. And the access flag is set with
1610 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1611 // signature slots are at the end of the field array and after all
1612 // other fields data.
1613 //
1614 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1615 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1616 // ...
1617 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1618 // [generic signature index]
1619 // [generic signature index]
1620 // ...
1621 //
1622 // Allocate a temporary resource array for field data. For each field,
1623 // a slot is reserved in the temporary array for the generic signature
1624 // index. After parsing all fields, the data are copied to a permanent
1625 // array and any unused slots will be discarded.
1626 ResourceMark rm(THREAD);
1627 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1628 u2,
1629 total_fields * (FieldInfo::field_slots + 1));
1630
1631 // The generic signature slots start after all other fields' data.
1632 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1633 int num_generic_signature = 0;
1634 for (int n = 0; n < length; n++) {
1635 // access_flags, name_index, descriptor_index, attributes_count
1636 cfs->guarantee_more(8, CHECK);
1637
1638 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1639
1640 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1641 verify_legal_field_modifiers(flags, is_interface, is_value_type, CHECK);
1642 AccessFlags access_flags;
1643 access_flags.set_flags(flags);
1644
1645 const u2 name_index = cfs->get_u2_fast();
1646 check_property(valid_symbol_at(name_index),
1647 "Invalid constant pool index %u for field name in class file %s",
1648 name_index, CHECK);
1649 const Symbol* const name = cp->symbol_at(name_index);
1650 verify_legal_field_name(name, CHECK);
1651
1652 const u2 signature_index = cfs->get_u2_fast();
1653 check_property(valid_symbol_at(signature_index),
1654 "Invalid constant pool index %u for field signature in class file %s",
1655 signature_index, CHECK);
1656 const Symbol* const sig = cp->symbol_at(signature_index);
1657 verify_legal_field_signature(name, sig, CHECK);
1658 assert(!access_flags.is_flattenable(), "ACC_FLATTENABLE should have been filtered out");
1659 if (sig->is_Q_signature()) {
1660 // assert(_major_version >= CONSTANT_CLASS_DESCRIPTORS, "Q-descriptors are only supported in recent classfiles");
1661 access_flags.set_is_flattenable();
1662 }
1663 if (access_flags.is_flattenable()) {
1664 // Array flattenability cannot be specified. Arrays of value classes are
1665 // are always flattenable. Arrays of other classes are not flattenable.
1666 if (sig->utf8_length() > 1 && sig->char_at(0) == '[') {
1667 classfile_parse_error(
1668 "Field \"%s\" with signature \"%s\" in class file %s is invalid."
1669 " ACC_FLATTENABLE cannot be specified for an array",
1670 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1671 }
1672 _has_flattenable_fields = true;
1673 }
1674
1675 u2 constantvalue_index = 0;
1676 bool is_synthetic = false;
1677 u2 generic_signature_index = 0;
1678 const bool is_static = access_flags.is_static();
1679 FieldAnnotationCollector parsed_annotations(_loader_data);
1680
1681 const u2 attributes_count = cfs->get_u2_fast();
1682 if (attributes_count > 0) {
1683 parse_field_attributes(cfs,
1684 attributes_count,
1685 is_static,
1686 signature_index,
1687 &constantvalue_index,
1688 &is_synthetic,
1689 &generic_signature_index,
1690 &parsed_annotations,
1691 CHECK);
1692
1693 if (parsed_annotations.field_annotations() != NULL) {
1694 if (_fields_annotations == NULL) {
1695 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1696 _loader_data, length, NULL,
1697 CHECK);
1698 }
1699 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1700 parsed_annotations.set_field_annotations(NULL);
1701 }
1702 if (parsed_annotations.field_type_annotations() != NULL) {
1703 if (_fields_type_annotations == NULL) {
1704 _fields_type_annotations =
1705 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1706 length,
1707 NULL,
1708 CHECK);
1709 }
1710 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1711 parsed_annotations.set_field_type_annotations(NULL);
1712 }
1713
1714 if (is_synthetic) {
1715 access_flags.set_is_synthetic();
1716 }
1717 if (generic_signature_index != 0) {
1718 access_flags.set_field_has_generic_signature();
1719 fa[generic_signature_slot] = generic_signature_index;
1720 generic_signature_slot ++;
1721 num_generic_signature ++;
1722 }
1723 }
1724
1725 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1726 field->initialize(access_flags.as_short(),
1727 name_index,
1728 signature_index,
1729 constantvalue_index);
1730 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1731
1732 // Remember how many oops we encountered and compute allocation type
1733 const FieldAllocationType atype = fac->update(is_static, type, access_flags.is_flattenable());
1734 field->set_allocation_type(atype);
1735
1736 // After field is initialized with type, we can augment it with aux info
1737 if (parsed_annotations.has_any_annotations())
1738 parsed_annotations.apply_to(field);
1739 }
1740
1741 int index = length;
1742 if (num_injected != 0) {
1743 for (int n = 0; n < num_injected; n++) {
1744 // Check for duplicates
1745 if (injected[n].may_be_java) {
1746 const Symbol* const name = injected[n].name();
1747 const Symbol* const signature = injected[n].signature();
1748 bool duplicate = false;
1749 for (int i = 0; i < length; i++) {
1750 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1751 if (name == cp->symbol_at(f->name_index()) &&
1752 signature == cp->symbol_at(f->signature_index())) {
1753 // Symbol is desclared in Java so skip this one
1754 duplicate = true;
1755 break;
1756 }
1757 }
1758 if (duplicate) {
1759 // These will be removed from the field array at the end
1760 continue;
1761 }
1762 }
1763
1764 // Injected field
1765 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1766 field->initialize(JVM_ACC_FIELD_INTERNAL,
1767 injected[n].name_index,
1768 injected[n].signature_index,
1769 0);
1770
1771 const BasicType type = FieldType::basic_type(injected[n].signature());
1772
1773 // Remember how many oops we encountered and compute allocation type
1774 const FieldAllocationType atype = fac->update(false, type, false);
1775 field->set_allocation_type(atype);
1776 index++;
1777 }
1778 }
1779
1780 if (is_value_type) {
1781 index = length + num_injected;
1782 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1783 field->initialize(JVM_ACC_FIELD_INTERNAL | JVM_ACC_STATIC,
1784 vmSymbols::default_value_name_enum,
1785 vmSymbols::java_lang_Object_enum,
1786 0);
1787 const BasicType type = FieldType::basic_type(vmSymbols::object_signature());
1788 const FieldAllocationType atype = fac->update(true, type, false);
1789 field->set_allocation_type(atype);
1790 index++;
1791 }
1792
1793 assert(NULL == _fields, "invariant");
1794
1795 _fields =
1796 MetadataFactory::new_array<u2>(_loader_data,
1797 index * FieldInfo::field_slots + num_generic_signature,
1798 CHECK);
1799 // Sometimes injected fields already exist in the Java source so
1800 // the fields array could be too long. In that case the
1801 // fields array is trimed. Also unused slots that were reserved
1802 // for generic signature indexes are discarded.
1803 {
1804 int i = 0;
1805 for (; i < index * FieldInfo::field_slots; i++) {
1806 _fields->at_put(i, fa[i]);
1807 }
1808 for (int j = total_fields * FieldInfo::field_slots;
1809 j < generic_signature_slot; j++) {
1810 _fields->at_put(i++, fa[j]);
1811 }
1812 assert(_fields->length() == i, "");
1813 }
1814
1815 if (_need_verify && length > 1) {
1816 // Check duplicated fields
1817 ResourceMark rm(THREAD);
1818 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1819 THREAD, NameSigHash*, HASH_ROW_SIZE);
1820 initialize_hashtable(names_and_sigs);
1821 bool dup = false;
1822 const Symbol* name = NULL;
1823 const Symbol* sig = NULL;
1824 {
1825 debug_only(NoSafepointVerifier nsv;)
1826 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1827 name = fs.name();
1828 sig = fs.signature();
1829 // If no duplicates, add name/signature in hashtable names_and_sigs.
1830 if (!put_after_lookup(name, sig, names_and_sigs)) {
1831 dup = true;
1832 break;
1833 }
1834 }
1835 }
1836 if (dup) {
1837 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1838 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1839 }
1840 }
1841 }
1842
1843
1844 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1845 u4 code_length,
1846 u4 exception_table_length,
1847 TRAPS) {
1848 assert(cfs != NULL, "invariant");
1849
1850 const unsafe_u2* const exception_table_start = cfs->current();
1851 assert(exception_table_start != NULL, "null exception table");
1852
1853 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1854 // end_pc,
1855 // handler_pc,
1856 // catch_type_index
1857
1858 // Will check legal target after parsing code array in verifier.
1859 if (_need_verify) {
1860 for (unsigned int i = 0; i < exception_table_length; i++) {
1861 const u2 start_pc = cfs->get_u2_fast();
1862 const u2 end_pc = cfs->get_u2_fast();
1863 const u2 handler_pc = cfs->get_u2_fast();
1864 const u2 catch_type_index = cfs->get_u2_fast();
1865 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1866 "Illegal exception table range in class file %s",
1867 CHECK_NULL);
1868 guarantee_property(handler_pc < code_length,
1869 "Illegal exception table handler in class file %s",
1870 CHECK_NULL);
1871 if (catch_type_index != 0) {
1872 guarantee_property(valid_klass_reference_at(catch_type_index),
1873 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1874 }
1875 }
1876 } else {
1877 cfs->skip_u2_fast(exception_table_length * 4);
1878 }
1879 return exception_table_start;
1880 }
1881
1882 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1883 u4 code_length,
1884 CompressedLineNumberWriteStream**const write_stream,
1885 TRAPS) {
1886
1887 const ClassFileStream* const cfs = _stream;
1888 unsigned int num_entries = cfs->get_u2(CHECK);
1889
1890 // Each entry is a u2 start_pc, and a u2 line_number
1891 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1892
1893 // Verify line number attribute and table length
1894 check_property(
1895 code_attribute_length == sizeof(u2) + length_in_bytes,
1896 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1897
1898 cfs->guarantee_more(length_in_bytes, CHECK);
1899
1900 if ((*write_stream) == NULL) {
1901 if (length_in_bytes > fixed_buffer_size) {
1902 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1903 } else {
1904 (*write_stream) = new CompressedLineNumberWriteStream(
1905 _linenumbertable_buffer, fixed_buffer_size);
1906 }
1907 }
1908
1909 while (num_entries-- > 0) {
1910 const u2 bci = cfs->get_u2_fast(); // start_pc
1911 const u2 line = cfs->get_u2_fast(); // line_number
1912 guarantee_property(bci < code_length,
1913 "Invalid pc in LineNumberTable in class file %s", CHECK);
1914 (*write_stream)->write_pair(bci, line);
1915 }
1916 }
1917
1918
1919 class LVT_Hash : public AllStatic {
1920 public:
1921
1922 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1923 /*
1924 * 3-tuple start_bci/length/slot has to be unique key,
1925 * so the following comparison seems to be redundant:
1926 * && elem->name_cp_index == entry->_elem->name_cp_index
1927 */
1928 return (e0.start_bci == e1.start_bci &&
1929 e0.length == e1.length &&
1930 e0.name_cp_index == e1.name_cp_index &&
1931 e0.slot == e1.slot);
1932 }
1933
1934 static unsigned int hash(LocalVariableTableElement const& e0) {
1935 unsigned int raw_hash = e0.start_bci;
1936
1937 raw_hash = e0.length + raw_hash * 37;
1938 raw_hash = e0.name_cp_index + raw_hash * 37;
1939 raw_hash = e0.slot + raw_hash * 37;
1940
1941 return raw_hash;
1942 }
1943 };
1944
1945
1946 // Class file LocalVariableTable elements.
1947 class Classfile_LVT_Element {
1948 public:
1949 u2 start_bci;
1950 u2 length;
1951 u2 name_cp_index;
1952 u2 descriptor_cp_index;
1953 u2 slot;
1954 };
1955
1956 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1957 LocalVariableTableElement* const lvt) {
1958 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1959 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1960 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1961 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1962 lvt->signature_cp_index = 0;
1963 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1964 }
1965
1966 // Function is used to parse both attributes:
1967 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1968 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1969 u4 code_length,
1970 u2 max_locals,
1971 u4 code_attribute_length,
1972 u2* const localvariable_table_length,
1973 bool isLVTT,
1974 TRAPS) {
1975 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1976 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1977 const unsigned int size =
1978 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1979
1980 const ConstantPool* const cp = _cp;
1981
1982 // Verify local variable table attribute has right length
1983 if (_need_verify) {
1984 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1985 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1986 }
1987
1988 const unsafe_u2* const localvariable_table_start = cfs->current();
1989 assert(localvariable_table_start != NULL, "null local variable table");
1990 if (!_need_verify) {
1991 cfs->skip_u2_fast(size);
1992 } else {
1993 cfs->guarantee_more(size * 2, CHECK_NULL);
1994 for(int i = 0; i < (*localvariable_table_length); i++) {
1995 const u2 start_pc = cfs->get_u2_fast();
1996 const u2 length = cfs->get_u2_fast();
1997 const u2 name_index = cfs->get_u2_fast();
1998 const u2 descriptor_index = cfs->get_u2_fast();
1999 const u2 index = cfs->get_u2_fast();
2000 // Assign to a u4 to avoid overflow
2001 const u4 end_pc = (u4)start_pc + (u4)length;
2002
2003 if (start_pc >= code_length) {
2004 classfile_parse_error(
2005 "Invalid start_pc %u in %s in class file %s",
2006 start_pc, tbl_name, CHECK_NULL);
2007 }
2008 if (end_pc > code_length) {
2009 classfile_parse_error(
2010 "Invalid length %u in %s in class file %s",
2011 length, tbl_name, CHECK_NULL);
2012 }
2013 const int cp_size = cp->length();
2014 guarantee_property(valid_symbol_at(name_index),
2015 "Name index %u in %s has bad constant type in class file %s",
2016 name_index, tbl_name, CHECK_NULL);
2017 guarantee_property(valid_symbol_at(descriptor_index),
2018 "Signature index %u in %s has bad constant type in class file %s",
2019 descriptor_index, tbl_name, CHECK_NULL);
2020
2021 const Symbol* const name = cp->symbol_at(name_index);
2022 const Symbol* const sig = cp->symbol_at(descriptor_index);
2023 verify_legal_field_name(name, CHECK_NULL);
2024 u2 extra_slot = 0;
2025 if (!isLVTT) {
2026 verify_legal_field_signature(name, sig, CHECK_NULL);
2027
2028 // 4894874: check special cases for double and long local variables
2029 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
2030 sig == vmSymbols::type_signature(T_LONG)) {
2031 extra_slot = 1;
2032 }
2033 }
2034 guarantee_property((index + extra_slot) < max_locals,
2035 "Invalid index %u in %s in class file %s",
2036 index, tbl_name, CHECK_NULL);
2037 }
2038 }
2039 return localvariable_table_start;
2040 }
2041
2042 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
2043 u4 code_attribute_length,
2044 bool need_verify,
2045 TRAPS) {
2046 assert(cfs != NULL, "invariant");
2047
2048 if (0 == code_attribute_length) {
2049 return NULL;
2050 }
2051
2052 const u1* const stackmap_table_start = cfs->current();
2053 assert(stackmap_table_start != NULL, "null stackmap table");
2054
2055 // check code_attribute_length first
2056 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2057
2058 if (!need_verify && !DumpSharedSpaces) {
2059 return NULL;
2060 }
2061 return stackmap_table_start;
2062 }
2063
2064 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2065 u2* const checked_exceptions_length,
2066 u4 method_attribute_length,
2067 TRAPS) {
2068 assert(cfs != NULL, "invariant");
2069 assert(checked_exceptions_length != NULL, "invariant");
2070
2071 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2072 *checked_exceptions_length = cfs->get_u2_fast();
2073 const unsigned int size =
2074 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2075 const unsafe_u2* const checked_exceptions_start = cfs->current();
2076 assert(checked_exceptions_start != NULL, "null checked exceptions");
2077 if (!_need_verify) {
2078 cfs->skip_u2_fast(size);
2079 } else {
2080 // Verify each value in the checked exception table
2081 u2 checked_exception;
2082 const u2 len = *checked_exceptions_length;
2083 cfs->guarantee_more(2 * len, CHECK_NULL);
2084 for (int i = 0; i < len; i++) {
2085 checked_exception = cfs->get_u2_fast();
2086 check_property(
2087 valid_klass_reference_at(checked_exception),
2088 "Exception name has bad type at constant pool %u in class file %s",
2089 checked_exception, CHECK_NULL);
2090 }
2091 }
2092 // check exceptions attribute length
2093 if (_need_verify) {
2094 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2095 sizeof(u2) * size),
2096 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2097 }
2098 return checked_exceptions_start;
2099 }
2100
2101 void ClassFileParser::throwIllegalSignature(const char* type,
2102 const Symbol* name,
2103 const Symbol* sig,
2104 TRAPS) const {
2105 assert(name != NULL, "invariant");
2106 assert(sig != NULL, "invariant");
2107
2108 const char* class_note = "";
2109 if (is_value_type() && name == vmSymbols::object_initializer_name()) {
2110 class_note = " (an inline class)";
2111 }
2112
2113 ResourceMark rm(THREAD);
2114 Exceptions::fthrow(THREAD_AND_LOCATION,
2115 vmSymbols::java_lang_ClassFormatError(),
2116 "%s \"%s\" in class %s%s has illegal signature \"%s\"", type,
2117 name->as_C_string(), _class_name->as_C_string(), class_note, sig->as_C_string());
2118 }
2119
2120 AnnotationCollector::ID
2121 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2122 const Symbol* name) {
2123 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2124 // Privileged code can use all annotations. Other code silently drops some.
2125 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2126 loader_data->is_platform_class_loader_data() ||
2127 loader_data->is_unsafe_anonymous();
2128 switch (sid) {
2129 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2130 if (_location != _in_method) break; // only allow for methods
2131 if (!privileged) break; // only allow in privileged code
2132 return _method_CallerSensitive;
2133 }
2134 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2135 if (_location != _in_method) break; // only allow for methods
2136 if (!privileged) break; // only allow in privileged code
2137 return _method_ForceInline;
2138 }
2139 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2140 if (_location != _in_method) break; // only allow for methods
2141 if (!privileged) break; // only allow in privileged code
2142 return _method_DontInline;
2143 }
2144 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2145 if (_location != _in_method) break; // only allow for methods
2146 if (!privileged) break; // only allow in privileged code
2147 return _method_InjectedProfile;
2148 }
2149 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2150 if (_location != _in_method) break; // only allow for methods
2151 if (!privileged) break; // only allow in privileged code
2152 return _method_LambdaForm_Compiled;
2153 }
2154 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
2155 if (_location != _in_method) break; // only allow for methods
2156 if (!privileged) break; // only allow in privileged code
2157 return _method_Hidden;
2158 }
2159 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2160 if (_location != _in_method) break; // only allow for methods
2161 if (!privileged) break; // only allow in privileged code
2162 return _method_HotSpotIntrinsicCandidate;
2163 }
2164 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2165 if (_location != _in_field) break; // only allow for fields
2166 if (!privileged) break; // only allow in privileged code
2167 return _field_Stable;
2168 }
2169 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2170 if (_location != _in_field && _location != _in_class) {
2171 break; // only allow for fields and classes
2172 }
2173 if (!EnableContended || (RestrictContended && !privileged)) {
2174 break; // honor privileges
2175 }
2176 return _jdk_internal_vm_annotation_Contended;
2177 }
2178 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2179 if (_location != _in_method) break; // only allow for methods
2180 if (RestrictReservedStack && !privileged) break; // honor privileges
2181 return _jdk_internal_vm_annotation_ReservedStackAccess;
2182 }
2183 default: {
2184 break;
2185 }
2186 }
2187 return AnnotationCollector::_unknown;
2188 }
2189
2190 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2191 if (is_contended())
2192 f->set_contended_group(contended_group());
2193 if (is_stable())
2194 f->set_stable(true);
2195 }
2196
2197 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2198 // If there's an error deallocate metadata for field annotations
2199 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2200 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2201 }
2202
2203 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2204 if (has_annotation(_method_CallerSensitive))
2205 m->set_caller_sensitive(true);
2206 if (has_annotation(_method_ForceInline))
2207 m->set_force_inline(true);
2208 if (has_annotation(_method_DontInline))
2209 m->set_dont_inline(true);
2210 if (has_annotation(_method_InjectedProfile))
2211 m->set_has_injected_profile(true);
2212 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2213 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2214 if (has_annotation(_method_Hidden))
2215 m->set_hidden(true);
2216 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2217 m->set_intrinsic_candidate(true);
2218 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2219 m->set_has_reserved_stack_access(true);
2220 }
2221
2222 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2223 assert(ik != NULL, "invariant");
2224 ik->set_is_contended(is_contended());
2225 }
2226
2227 #define MAX_ARGS_SIZE 255
2228 #define MAX_CODE_SIZE 65535
2229 #define INITIAL_MAX_LVT_NUMBER 256
2230
2231 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2232 *
2233 * Rules for LVT's and LVTT's are:
2234 * - There can be any number of LVT's and LVTT's.
2235 * - If there are n LVT's, it is the same as if there was just
2236 * one LVT containing all the entries from the n LVT's.
2237 * - There may be no more than one LVT entry per local variable.
2238 * Two LVT entries are 'equal' if these fields are the same:
2239 * start_pc, length, name, slot
2240 * - There may be no more than one LVTT entry per each LVT entry.
2241 * Each LVTT entry has to match some LVT entry.
2242 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2243 */
2244 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2245 int lvt_cnt,
2246 u2* const localvariable_table_length,
2247 const unsafe_u2** const localvariable_table_start,
2248 int lvtt_cnt,
2249 u2* const localvariable_type_table_length,
2250 const unsafe_u2** const localvariable_type_table_start,
2251 TRAPS) {
2252
2253 ResourceMark rm(THREAD);
2254
2255 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2256 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2257
2258 LVT_HashTable* const table = new LVT_HashTable();
2259
2260 // To fill LocalVariableTable in
2261 const Classfile_LVT_Element* cf_lvt;
2262 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2263
2264 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2265 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2266 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2267 copy_lvt_element(&cf_lvt[idx], lvt);
2268 // If no duplicates, add LVT elem in hashtable.
2269 if (table->put(*lvt, lvt) == false
2270 && _need_verify
2271 && _major_version >= JAVA_1_5_VERSION) {
2272 classfile_parse_error("Duplicated LocalVariableTable attribute "
2273 "entry for '%s' in class file %s",
2274 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2275 CHECK);
2276 }
2277 }
2278 }
2279
2280 // To merge LocalVariableTable and LocalVariableTypeTable
2281 const Classfile_LVT_Element* cf_lvtt;
2282 LocalVariableTableElement lvtt_elem;
2283
2284 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2285 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2286 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2287 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2288 LocalVariableTableElement** entry = table->get(lvtt_elem);
2289 if (entry == NULL) {
2290 if (_need_verify) {
2291 classfile_parse_error("LVTT entry for '%s' in class file %s "
2292 "does not match any LVT entry",
2293 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2294 CHECK);
2295 }
2296 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2297 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2298 "entry for '%s' in class file %s",
2299 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2300 CHECK);
2301 } else {
2302 // to add generic signatures into LocalVariableTable
2303 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2304 }
2305 }
2306 }
2307 }
2308
2309
2310 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2311 const u1* runtime_visible_annotations,
2312 int runtime_visible_annotations_length,
2313 const u1* runtime_invisible_annotations,
2314 int runtime_invisible_annotations_length,
2315 const u1* runtime_visible_parameter_annotations,
2316 int runtime_visible_parameter_annotations_length,
2317 const u1* runtime_invisible_parameter_annotations,
2318 int runtime_invisible_parameter_annotations_length,
2319 const u1* runtime_visible_type_annotations,
2320 int runtime_visible_type_annotations_length,
2321 const u1* runtime_invisible_type_annotations,
2322 int runtime_invisible_type_annotations_length,
2323 const u1* annotation_default,
2324 int annotation_default_length,
2325 TRAPS) {
2326
2327 AnnotationArray* a;
2328
2329 if (runtime_visible_annotations_length +
2330 runtime_invisible_annotations_length > 0) {
2331 a = assemble_annotations(runtime_visible_annotations,
2332 runtime_visible_annotations_length,
2333 runtime_invisible_annotations,
2334 runtime_invisible_annotations_length,
2335 CHECK);
2336 cm->set_method_annotations(a);
2337 }
2338
2339 if (runtime_visible_parameter_annotations_length +
2340 runtime_invisible_parameter_annotations_length > 0) {
2341 a = assemble_annotations(runtime_visible_parameter_annotations,
2342 runtime_visible_parameter_annotations_length,
2343 runtime_invisible_parameter_annotations,
2344 runtime_invisible_parameter_annotations_length,
2345 CHECK);
2346 cm->set_parameter_annotations(a);
2347 }
2348
2349 if (annotation_default_length > 0) {
2350 a = assemble_annotations(annotation_default,
2351 annotation_default_length,
2352 NULL,
2353 0,
2354 CHECK);
2355 cm->set_default_annotations(a);
2356 }
2357
2358 if (runtime_visible_type_annotations_length +
2359 runtime_invisible_type_annotations_length > 0) {
2360 a = assemble_annotations(runtime_visible_type_annotations,
2361 runtime_visible_type_annotations_length,
2362 runtime_invisible_type_annotations,
2363 runtime_invisible_type_annotations_length,
2364 CHECK);
2365 cm->set_type_annotations(a);
2366 }
2367 }
2368
2369
2370 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2371 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2372 // Method* to save footprint, so we only know the size of the resulting Method* when the
2373 // entire method attribute is parsed.
2374 //
2375 // The promoted_flags parameter is used to pass relevant access_flags
2376 // from the method back up to the containing klass. These flag values
2377 // are added to klass's access_flags.
2378
2379 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2380 bool is_interface,
2381 bool is_value_type,
2382 const ConstantPool* cp,
2383 AccessFlags* const promoted_flags,
2384 TRAPS) {
2385 assert(cfs != NULL, "invariant");
2386 assert(cp != NULL, "invariant");
2387 assert(promoted_flags != NULL, "invariant");
2388
2389 ResourceMark rm(THREAD);
2390 // Parse fixed parts:
2391 // access_flags, name_index, descriptor_index, attributes_count
2392 cfs->guarantee_more(8, CHECK_NULL);
2393
2394 int flags = cfs->get_u2_fast();
2395 const u2 name_index = cfs->get_u2_fast();
2396 const int cp_size = cp->length();
2397 check_property(
2398 valid_symbol_at(name_index),
2399 "Illegal constant pool index %u for method name in class file %s",
2400 name_index, CHECK_NULL);
2401 const Symbol* const name = cp->symbol_at(name_index);
2402 verify_legal_method_name(name, CHECK_NULL);
2403
2404 const u2 signature_index = cfs->get_u2_fast();
2405 guarantee_property(
2406 valid_symbol_at(signature_index),
2407 "Illegal constant pool index %u for method signature in class file %s",
2408 signature_index, CHECK_NULL);
2409 const Symbol* const signature = cp->symbol_at(signature_index);
2410
2411 if (name == vmSymbols::class_initializer_name()) {
2412 // We ignore the other access flags for a valid class initializer.
2413 // (JVM Spec 2nd ed., chapter 4.6)
2414 if (_major_version < 51) { // backward compatibility
2415 flags = JVM_ACC_STATIC;
2416 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2417 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2418 } else {
2419 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2420 }
2421 } else {
2422 verify_legal_method_modifiers(flags, is_interface, is_value_type, name, CHECK_NULL);
2423 }
2424
2425 if (name == vmSymbols::object_initializer_name()) {
2426 if (is_interface) {
2427 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2428 } else if (!is_value_type && signature->is_void_method_signature()) {
2429 // OK, a constructor
2430 } else if (is_value_type && !signature->is_void_method_signature()) {
2431 // also OK, a static factory, as long as the return value is good
2432 bool ok = false;
2433 SignatureStream ss((Symbol*) signature, true);
2434 while (!ss.at_return_type()) ss.next();
2435 if (ss.is_object()) {
2436 TempNewSymbol ret = ss.as_symbol_or_null();
2437 const Symbol* required = class_name();
2438 if (is_unsafe_anonymous()) {
2439 // The original class name in the UAC byte stream gets changed. So
2440 // using the original name in the return type is no longer valid.
2441 required = vmSymbols::java_lang_Object();
2442 }
2443 ok = (ret == required);
2444 }
2445 if (!ok) {
2446 throwIllegalSignature("Method", name, signature, CHECK_0);
2447 }
2448 } else {
2449 // not OK, so throw the same error as in verify_legal_method_signature.
2450 throwIllegalSignature("Method", name, signature, CHECK_0);
2451 }
2452 // A declared <init> method must always be either a non-static
2453 // object constructor, with a void return, or else it must be a
2454 // static factory method, with a non-void return. No other
2455 // definition of <init> is possible.
2456 //
2457 // The verifier (in verify_invoke_instructions) will inspect the
2458 // signature of any attempt to invoke <init>, and ensures that it
2459 // returns non-void if and only if it is being invoked by
2460 // invokestatic, and void if and only if it is being invoked by
2461 // invokespecial.
2462 //
2463 // When a symbolic reference to <init> is resolved for a
2464 // particular invocation mode (special or static), the mode is
2465 // matched to the JVM_ACC_STATIC modifier of the <init> method.
2466 // Thus, it is impossible to statically invoke a constructor, and
2467 // impossible to "new + invokespecial" a static factory, either
2468 // through bytecode or through reflection.
2469 }
2470
2471 int args_size = -1; // only used when _need_verify is true
2472 if (_need_verify) {
2473 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2474 verify_legal_method_signature(name, signature, CHECK_NULL);
2475 if (args_size > MAX_ARGS_SIZE) {
2476 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2477 }
2478 }
2479
2480 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2481
2482 // Default values for code and exceptions attribute elements
2483 u2 max_stack = 0;
2484 u2 max_locals = 0;
2485 u4 code_length = 0;
2486 const u1* code_start = 0;
2487 u2 exception_table_length = 0;
2488 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2489 Array<int>* exception_handlers = Universe::the_empty_int_array();
2490 u2 checked_exceptions_length = 0;
2491 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2492 CompressedLineNumberWriteStream* linenumber_table = NULL;
2493 int linenumber_table_length = 0;
2494 int total_lvt_length = 0;
2495 u2 lvt_cnt = 0;
2496 u2 lvtt_cnt = 0;
2497 bool lvt_allocated = false;
2498 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2499 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2500 u2* localvariable_table_length = NULL;
2501 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2502 u2* localvariable_type_table_length = NULL;
2503 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2504 int method_parameters_length = -1;
2505 const u1* method_parameters_data = NULL;
2506 bool method_parameters_seen = false;
2507 bool parsed_code_attribute = false;
2508 bool parsed_checked_exceptions_attribute = false;
2509 bool parsed_stackmap_attribute = false;
2510 // stackmap attribute - JDK1.5
2511 const u1* stackmap_data = NULL;
2512 int stackmap_data_length = 0;
2513 u2 generic_signature_index = 0;
2514 MethodAnnotationCollector parsed_annotations;
2515 const u1* runtime_visible_annotations = NULL;
2516 int runtime_visible_annotations_length = 0;
2517 const u1* runtime_invisible_annotations = NULL;
2518 int runtime_invisible_annotations_length = 0;
2519 const u1* runtime_visible_parameter_annotations = NULL;
2520 int runtime_visible_parameter_annotations_length = 0;
2521 const u1* runtime_invisible_parameter_annotations = NULL;
2522 int runtime_invisible_parameter_annotations_length = 0;
2523 const u1* runtime_visible_type_annotations = NULL;
2524 int runtime_visible_type_annotations_length = 0;
2525 const u1* runtime_invisible_type_annotations = NULL;
2526 int runtime_invisible_type_annotations_length = 0;
2527 bool runtime_invisible_annotations_exists = false;
2528 bool runtime_invisible_type_annotations_exists = false;
2529 bool runtime_invisible_parameter_annotations_exists = false;
2530 const u1* annotation_default = NULL;
2531 int annotation_default_length = 0;
2532
2533 // Parse code and exceptions attribute
2534 u2 method_attributes_count = cfs->get_u2_fast();
2535 while (method_attributes_count--) {
2536 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2537 const u2 method_attribute_name_index = cfs->get_u2_fast();
2538 const u4 method_attribute_length = cfs->get_u4_fast();
2539 check_property(
2540 valid_symbol_at(method_attribute_name_index),
2541 "Invalid method attribute name index %u in class file %s",
2542 method_attribute_name_index, CHECK_NULL);
2543
2544 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2545 if (method_attribute_name == vmSymbols::tag_code()) {
2546 // Parse Code attribute
2547 if (_need_verify) {
2548 guarantee_property(
2549 !access_flags.is_native() && !access_flags.is_abstract(),
2550 "Code attribute in native or abstract methods in class file %s",
2551 CHECK_NULL);
2552 }
2553 if (parsed_code_attribute) {
2554 classfile_parse_error("Multiple Code attributes in class file %s",
2555 CHECK_NULL);
2556 }
2557 parsed_code_attribute = true;
2558
2559 // Stack size, locals size, and code size
2560 if (_major_version == 45 && _minor_version <= 2) {
2561 cfs->guarantee_more(4, CHECK_NULL);
2562 max_stack = cfs->get_u1_fast();
2563 max_locals = cfs->get_u1_fast();
2564 code_length = cfs->get_u2_fast();
2565 } else {
2566 cfs->guarantee_more(8, CHECK_NULL);
2567 max_stack = cfs->get_u2_fast();
2568 max_locals = cfs->get_u2_fast();
2569 code_length = cfs->get_u4_fast();
2570 }
2571 if (_need_verify) {
2572 guarantee_property(args_size <= max_locals,
2573 "Arguments can't fit into locals in class file %s",
2574 CHECK_NULL);
2575 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2576 "Invalid method Code length %u in class file %s",
2577 code_length, CHECK_NULL);
2578 }
2579 // Code pointer
2580 code_start = cfs->current();
2581 assert(code_start != NULL, "null code start");
2582 cfs->guarantee_more(code_length, CHECK_NULL);
2583 cfs->skip_u1_fast(code_length);
2584
2585 // Exception handler table
2586 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2587 exception_table_length = cfs->get_u2_fast();
2588 if (exception_table_length > 0) {
2589 exception_table_start = parse_exception_table(cfs,
2590 code_length,
2591 exception_table_length,
2592 CHECK_NULL);
2593 }
2594
2595 // Parse additional attributes in code attribute
2596 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2597 u2 code_attributes_count = cfs->get_u2_fast();
2598
2599 unsigned int calculated_attribute_length = 0;
2600
2601 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2602 calculated_attribute_length =
2603 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2604 } else {
2605 // max_stack, locals and length are smaller in pre-version 45.2 classes
2606 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2607 }
2608 calculated_attribute_length +=
2609 code_length +
2610 sizeof(exception_table_length) +
2611 sizeof(code_attributes_count) +
2612 exception_table_length *
2613 ( sizeof(u2) + // start_pc
2614 sizeof(u2) + // end_pc
2615 sizeof(u2) + // handler_pc
2616 sizeof(u2) ); // catch_type_index
2617
2618 while (code_attributes_count--) {
2619 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2620 const u2 code_attribute_name_index = cfs->get_u2_fast();
2621 const u4 code_attribute_length = cfs->get_u4_fast();
2622 calculated_attribute_length += code_attribute_length +
2623 sizeof(code_attribute_name_index) +
2624 sizeof(code_attribute_length);
2625 check_property(valid_symbol_at(code_attribute_name_index),
2626 "Invalid code attribute name index %u in class file %s",
2627 code_attribute_name_index,
2628 CHECK_NULL);
2629 if (LoadLineNumberTables &&
2630 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2631 // Parse and compress line number table
2632 parse_linenumber_table(code_attribute_length,
2633 code_length,
2634 &linenumber_table,
2635 CHECK_NULL);
2636
2637 } else if (LoadLocalVariableTables &&
2638 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2639 // Parse local variable table
2640 if (!lvt_allocated) {
2641 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2642 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2643 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2644 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2645 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2646 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2647 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2648 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2649 lvt_allocated = true;
2650 }
2651 if (lvt_cnt == max_lvt_cnt) {
2652 max_lvt_cnt <<= 1;
2653 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2654 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2655 }
2656 localvariable_table_start[lvt_cnt] =
2657 parse_localvariable_table(cfs,
2658 code_length,
2659 max_locals,
2660 code_attribute_length,
2661 &localvariable_table_length[lvt_cnt],
2662 false, // is not LVTT
2663 CHECK_NULL);
2664 total_lvt_length += localvariable_table_length[lvt_cnt];
2665 lvt_cnt++;
2666 } else if (LoadLocalVariableTypeTables &&
2667 _major_version >= JAVA_1_5_VERSION &&
2668 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2669 if (!lvt_allocated) {
2670 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2671 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2672 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2673 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2674 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2675 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2676 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2677 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2678 lvt_allocated = true;
2679 }
2680 // Parse local variable type table
2681 if (lvtt_cnt == max_lvtt_cnt) {
2682 max_lvtt_cnt <<= 1;
2683 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2684 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2685 }
2686 localvariable_type_table_start[lvtt_cnt] =
2687 parse_localvariable_table(cfs,
2688 code_length,
2689 max_locals,
2690 code_attribute_length,
2691 &localvariable_type_table_length[lvtt_cnt],
2692 true, // is LVTT
2693 CHECK_NULL);
2694 lvtt_cnt++;
2695 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2696 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2697 // Stack map is only needed by the new verifier in JDK1.5.
2698 if (parsed_stackmap_attribute) {
2699 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2700 }
2701 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2702 stackmap_data_length = code_attribute_length;
2703 parsed_stackmap_attribute = true;
2704 } else {
2705 // Skip unknown attributes
2706 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2707 }
2708 }
2709 // check method attribute length
2710 if (_need_verify) {
2711 guarantee_property(method_attribute_length == calculated_attribute_length,
2712 "Code segment has wrong length in class file %s",
2713 CHECK_NULL);
2714 }
2715 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2716 // Parse Exceptions attribute
2717 if (parsed_checked_exceptions_attribute) {
2718 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2719 CHECK_NULL);
2720 }
2721 parsed_checked_exceptions_attribute = true;
2722 checked_exceptions_start =
2723 parse_checked_exceptions(cfs,
2724 &checked_exceptions_length,
2725 method_attribute_length,
2726 CHECK_NULL);
2727 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2728 // reject multiple method parameters
2729 if (method_parameters_seen) {
2730 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2731 CHECK_NULL);
2732 }
2733 method_parameters_seen = true;
2734 method_parameters_length = cfs->get_u1_fast();
2735 const u2 real_length = (method_parameters_length * 4u) + 1u;
2736 if (method_attribute_length != real_length) {
2737 classfile_parse_error(
2738 "Invalid MethodParameters method attribute length %u in class file",
2739 method_attribute_length, CHECK_NULL);
2740 }
2741 method_parameters_data = cfs->current();
2742 cfs->skip_u2_fast(method_parameters_length);
2743 cfs->skip_u2_fast(method_parameters_length);
2744 // ignore this attribute if it cannot be reflected
2745 if (!SystemDictionary::Parameter_klass_loaded())
2746 method_parameters_length = -1;
2747 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2748 if (method_attribute_length != 0) {
2749 classfile_parse_error(
2750 "Invalid Synthetic method attribute length %u in class file %s",
2751 method_attribute_length, CHECK_NULL);
2752 }
2753 // Should we check that there hasn't already been a synthetic attribute?
2754 access_flags.set_is_synthetic();
2755 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2756 if (method_attribute_length != 0) {
2757 classfile_parse_error(
2758 "Invalid Deprecated method attribute length %u in class file %s",
2759 method_attribute_length, CHECK_NULL);
2760 }
2761 } else if (_major_version >= JAVA_1_5_VERSION) {
2762 if (method_attribute_name == vmSymbols::tag_signature()) {
2763 if (generic_signature_index != 0) {
2764 classfile_parse_error(
2765 "Multiple Signature attributes for method in class file %s",
2766 CHECK_NULL);
2767 }
2768 if (method_attribute_length != 2) {
2769 classfile_parse_error(
2770 "Invalid Signature attribute length %u in class file %s",
2771 method_attribute_length, CHECK_NULL);
2772 }
2773 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2774 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2775 if (runtime_visible_annotations != NULL) {
2776 classfile_parse_error(
2777 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2778 CHECK_NULL);
2779 }
2780 runtime_visible_annotations_length = method_attribute_length;
2781 runtime_visible_annotations = cfs->current();
2782 assert(runtime_visible_annotations != NULL, "null visible annotations");
2783 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2784 parse_annotations(cp,
2785 runtime_visible_annotations,
2786 runtime_visible_annotations_length,
2787 &parsed_annotations,
2788 _loader_data,
2789 CHECK_NULL);
2790 cfs->skip_u1_fast(runtime_visible_annotations_length);
2791 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2792 if (runtime_invisible_annotations_exists) {
2793 classfile_parse_error(
2794 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2795 CHECK_NULL);
2796 }
2797 runtime_invisible_annotations_exists = true;
2798 if (PreserveAllAnnotations) {
2799 runtime_invisible_annotations_length = method_attribute_length;
2800 runtime_invisible_annotations = cfs->current();
2801 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2802 }
2803 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2804 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2805 if (runtime_visible_parameter_annotations != NULL) {
2806 classfile_parse_error(
2807 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2808 CHECK_NULL);
2809 }
2810 runtime_visible_parameter_annotations_length = method_attribute_length;
2811 runtime_visible_parameter_annotations = cfs->current();
2812 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2813 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2814 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2815 if (runtime_invisible_parameter_annotations_exists) {
2816 classfile_parse_error(
2817 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2818 CHECK_NULL);
2819 }
2820 runtime_invisible_parameter_annotations_exists = true;
2821 if (PreserveAllAnnotations) {
2822 runtime_invisible_parameter_annotations_length = method_attribute_length;
2823 runtime_invisible_parameter_annotations = cfs->current();
2824 assert(runtime_invisible_parameter_annotations != NULL,
2825 "null invisible parameter annotations");
2826 }
2827 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2828 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2829 if (annotation_default != NULL) {
2830 classfile_parse_error(
2831 "Multiple AnnotationDefault attributes for method in class file %s",
2832 CHECK_NULL);
2833 }
2834 annotation_default_length = method_attribute_length;
2835 annotation_default = cfs->current();
2836 assert(annotation_default != NULL, "null annotation default");
2837 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2838 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2839 if (runtime_visible_type_annotations != NULL) {
2840 classfile_parse_error(
2841 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2842 CHECK_NULL);
2843 }
2844 runtime_visible_type_annotations_length = method_attribute_length;
2845 runtime_visible_type_annotations = cfs->current();
2846 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2847 // No need for the VM to parse Type annotations
2848 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2849 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2850 if (runtime_invisible_type_annotations_exists) {
2851 classfile_parse_error(
2852 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2853 CHECK_NULL);
2854 } else {
2855 runtime_invisible_type_annotations_exists = true;
2856 }
2857 if (PreserveAllAnnotations) {
2858 runtime_invisible_type_annotations_length = method_attribute_length;
2859 runtime_invisible_type_annotations = cfs->current();
2860 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2861 }
2862 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2863 } else {
2864 // Skip unknown attributes
2865 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2866 }
2867 } else {
2868 // Skip unknown attributes
2869 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2870 }
2871 }
2872
2873 if (linenumber_table != NULL) {
2874 linenumber_table->write_terminator();
2875 linenumber_table_length = linenumber_table->position();
2876 }
2877
2878 // Make sure there's at least one Code attribute in non-native/non-abstract method
2879 if (_need_verify) {
2880 guarantee_property(access_flags.is_native() ||
2881 access_flags.is_abstract() ||
2882 parsed_code_attribute,
2883 "Absent Code attribute in method that is not native or abstract in class file %s",
2884 CHECK_NULL);
2885 }
2886
2887 // All sizing information for a Method* is finally available, now create it
2888 InlineTableSizes sizes(
2889 total_lvt_length,
2890 linenumber_table_length,
2891 exception_table_length,
2892 checked_exceptions_length,
2893 method_parameters_length,
2894 generic_signature_index,
2895 runtime_visible_annotations_length +
2896 runtime_invisible_annotations_length,
2897 runtime_visible_parameter_annotations_length +
2898 runtime_invisible_parameter_annotations_length,
2899 runtime_visible_type_annotations_length +
2900 runtime_invisible_type_annotations_length,
2901 annotation_default_length,
2902 0);
2903
2904 Method* const m = Method::allocate(_loader_data,
2905 code_length,
2906 access_flags,
2907 &sizes,
2908 ConstMethod::NORMAL,
2909 CHECK_NULL);
2910
2911 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2912
2913 // Fill in information from fixed part (access_flags already set)
2914 m->set_constants(_cp);
2915 m->set_name_index(name_index);
2916 m->set_signature_index(signature_index);
2917
2918 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2919 m->constMethod()->set_result_type(rtf.type());
2920
2921 if (args_size >= 0) {
2922 m->set_size_of_parameters(args_size);
2923 } else {
2924 m->compute_size_of_parameters(THREAD);
2925 }
2926 #ifdef ASSERT
2927 if (args_size >= 0) {
2928 m->compute_size_of_parameters(THREAD);
2929 assert(args_size == m->size_of_parameters(), "");
2930 }
2931 #endif
2932
2933 // Fill in code attribute information
2934 m->set_max_stack(max_stack);
2935 m->set_max_locals(max_locals);
2936 if (stackmap_data != NULL) {
2937 m->constMethod()->copy_stackmap_data(_loader_data,
2938 (u1*)stackmap_data,
2939 stackmap_data_length,
2940 CHECK_NULL);
2941 }
2942
2943 // Copy byte codes
2944 m->set_code((u1*)code_start);
2945
2946 // Copy line number table
2947 if (linenumber_table != NULL) {
2948 memcpy(m->compressed_linenumber_table(),
2949 linenumber_table->buffer(),
2950 linenumber_table_length);
2951 }
2952
2953 // Copy exception table
2954 if (exception_table_length > 0) {
2955 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2956 m->exception_table_start(),
2957 exception_table_length * sizeof(ExceptionTableElement),
2958 sizeof(u2));
2959 }
2960
2961 // Copy method parameters
2962 if (method_parameters_length > 0) {
2963 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2964 for (int i = 0; i < method_parameters_length; i++) {
2965 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2966 method_parameters_data += 2;
2967 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2968 method_parameters_data += 2;
2969 }
2970 }
2971
2972 // Copy checked exceptions
2973 if (checked_exceptions_length > 0) {
2974 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2975 m->checked_exceptions_start(),
2976 checked_exceptions_length * sizeof(CheckedExceptionElement),
2977 sizeof(u2));
2978 }
2979
2980 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2981 if (total_lvt_length > 0) {
2982 promoted_flags->set_has_localvariable_table();
2983 copy_localvariable_table(m->constMethod(),
2984 lvt_cnt,
2985 localvariable_table_length,
2986 localvariable_table_start,
2987 lvtt_cnt,
2988 localvariable_type_table_length,
2989 localvariable_type_table_start,
2990 CHECK_NULL);
2991 }
2992
2993 if (parsed_annotations.has_any_annotations())
2994 parsed_annotations.apply_to(m);
2995
2996 // Copy annotations
2997 copy_method_annotations(m->constMethod(),
2998 runtime_visible_annotations,
2999 runtime_visible_annotations_length,
3000 runtime_invisible_annotations,
3001 runtime_invisible_annotations_length,
3002 runtime_visible_parameter_annotations,
3003 runtime_visible_parameter_annotations_length,
3004 runtime_invisible_parameter_annotations,
3005 runtime_invisible_parameter_annotations_length,
3006 runtime_visible_type_annotations,
3007 runtime_visible_type_annotations_length,
3008 runtime_invisible_type_annotations,
3009 runtime_invisible_type_annotations_length,
3010 annotation_default,
3011 annotation_default_length,
3012 CHECK_NULL);
3013
3014 if (name == vmSymbols::finalize_method_name() &&
3015 signature == vmSymbols::void_method_signature()) {
3016 if (m->is_empty_method()) {
3017 _has_empty_finalizer = true;
3018 } else {
3019 _has_finalizer = true;
3020 }
3021 }
3022 if (name == vmSymbols::object_initializer_name() &&
3023 signature == vmSymbols::void_method_signature() &&
3024 m->is_vanilla_constructor()) {
3025 _has_vanilla_constructor = true;
3026 }
3027
3028 NOT_PRODUCT(m->verify());
3029 return m;
3030 }
3031
3032
3033 // The promoted_flags parameter is used to pass relevant access_flags
3034 // from the methods back up to the containing klass. These flag values
3035 // are added to klass's access_flags.
3036 // Side-effects: populates the _methods field in the parser
3037 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
3038 bool is_interface,
3039 bool is_value_type,
3040 AccessFlags* promoted_flags,
3041 bool* has_final_method,
3042 bool* declares_nonstatic_concrete_methods,
3043 TRAPS) {
3044 assert(cfs != NULL, "invariant");
3045 assert(promoted_flags != NULL, "invariant");
3046 assert(has_final_method != NULL, "invariant");
3047 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
3048
3049 assert(NULL == _methods, "invariant");
3050
3051 cfs->guarantee_more(2, CHECK); // length
3052 const u2 length = cfs->get_u2_fast();
3053 if (length == 0) {
3054 _methods = Universe::the_empty_method_array();
3055 } else {
3056 _methods = MetadataFactory::new_array<Method*>(_loader_data,
3057 length,
3058 NULL,
3059 CHECK);
3060
3061 for (int index = 0; index < length; index++) {
3062 Method* method = parse_method(cfs,
3063 is_interface,
3064 is_value_type,
3065 _cp,
3066 promoted_flags,
3067 CHECK);
3068
3069 if (method->is_final()) {
3070 *has_final_method = true;
3071 }
3072 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
3073 // used for interface initialization, and default method inheritance analysis
3074 if (is_interface && !(*declares_nonstatic_concrete_methods)
3075 && !method->is_abstract() && !method->is_static()) {
3076 *declares_nonstatic_concrete_methods = true;
3077 }
3078 _methods->at_put(index, method);
3079 }
3080
3081 if (_need_verify && length > 1) {
3082 // Check duplicated methods
3083 ResourceMark rm(THREAD);
3084 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
3085 THREAD, NameSigHash*, HASH_ROW_SIZE);
3086 initialize_hashtable(names_and_sigs);
3087 bool dup = false;
3088 const Symbol* name = NULL;
3089 const Symbol* sig = NULL;
3090 {
3091 debug_only(NoSafepointVerifier nsv;)
3092 for (int i = 0; i < length; i++) {
3093 const Method* const m = _methods->at(i);
3094 name = m->name();
3095 sig = m->signature();
3096 // If no duplicates, add name/signature in hashtable names_and_sigs.
3097 if (!put_after_lookup(name, sig, names_and_sigs)) {
3098 dup = true;
3099 break;
3100 }
3101 }
3102 }
3103 if (dup) {
3104 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
3105 name->as_C_string(), sig->as_klass_external_name(), CHECK);
3106 }
3107 }
3108 }
3109 }
3110
3111 static const intArray* sort_methods(Array<Method*>* methods) {
3112 const int length = methods->length();
3113 // If JVMTI original method ordering or sharing is enabled we have to
3114 // remember the original class file ordering.
3115 // We temporarily use the vtable_index field in the Method* to store the
3116 // class file index, so we can read in after calling qsort.
3117 // Put the method ordering in the shared archive.
3118 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3119 for (int index = 0; index < length; index++) {
3120 Method* const m = methods->at(index);
3121 assert(!m->valid_vtable_index(), "vtable index should not be set");
3122 m->set_vtable_index(index);
3123 }
3124 }
3125 // Sort method array by ascending method name (for faster lookups & vtable construction)
3126 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3127 Method::sort_methods(methods);
3128
3129 intArray* method_ordering = NULL;
3130 // If JVMTI original method ordering or sharing is enabled construct int
3131 // array remembering the original ordering
3132 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3133 method_ordering = new intArray(length, length, -1);
3134 for (int index = 0; index < length; index++) {
3135 Method* const m = methods->at(index);
3136 const int old_index = m->vtable_index();
3137 assert(old_index >= 0 && old_index < length, "invalid method index");
3138 method_ordering->at_put(index, old_index);
3139 m->set_vtable_index(Method::invalid_vtable_index);
3140 }
3141 }
3142 return method_ordering;
3143 }
3144
3145 // Parse generic_signature attribute for methods and fields
3146 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3147 TRAPS) {
3148 assert(cfs != NULL, "invariant");
3149
3150 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3151 const u2 generic_signature_index = cfs->get_u2_fast();
3152 check_property(
3153 valid_symbol_at(generic_signature_index),
3154 "Invalid Signature attribute at constant pool index %u in class file %s",
3155 generic_signature_index, CHECK_0);
3156 return generic_signature_index;
3157 }
3158
3159 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3160 TRAPS) {
3161
3162 assert(cfs != NULL, "invariant");
3163
3164 cfs->guarantee_more(2, CHECK); // sourcefile_index
3165 const u2 sourcefile_index = cfs->get_u2_fast();
3166 check_property(
3167 valid_symbol_at(sourcefile_index),
3168 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3169 sourcefile_index, CHECK);
3170 set_class_sourcefile_index(sourcefile_index);
3171 }
3172
3173 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3174 int length,
3175 TRAPS) {
3176 assert(cfs != NULL, "invariant");
3177
3178 const u1* const sde_buffer = cfs->current();
3179 assert(sde_buffer != NULL, "null sde buffer");
3180
3181 // Don't bother storing it if there is no way to retrieve it
3182 if (JvmtiExport::can_get_source_debug_extension()) {
3183 assert((length+1) > length, "Overflow checking");
3184 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3185 for (int i = 0; i < length; i++) {
3186 sde[i] = sde_buffer[i];
3187 }
3188 sde[length] = '\0';
3189 set_class_sde_buffer((const char*)sde, length);
3190 }
3191 // Got utf8 string, set stream position forward
3192 cfs->skip_u1(length, CHECK);
3193 }
3194
3195
3196 // Inner classes can be static, private or protected (classic VM does this)
3197 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3198 JVM_ACC_PRIVATE | \
3199 JVM_ACC_PROTECTED | \
3200 JVM_ACC_STATIC \
3201 )
3202
3203 // Return number of classes in the inner classes attribute table
3204 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3205 const u1* const inner_classes_attribute_start,
3206 bool parsed_enclosingmethod_attribute,
3207 u2 enclosing_method_class_index,
3208 u2 enclosing_method_method_index,
3209 TRAPS) {
3210 const u1* const current_mark = cfs->current();
3211 u2 length = 0;
3212 if (inner_classes_attribute_start != NULL) {
3213 cfs->set_current(inner_classes_attribute_start);
3214 cfs->guarantee_more(2, CHECK_0); // length
3215 length = cfs->get_u2_fast();
3216 }
3217
3218 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3219 // method data:
3220 // [inner_class_info_index,
3221 // outer_class_info_index,
3222 // inner_name_index,
3223 // inner_class_access_flags,
3224 // ...
3225 // enclosing_method_class_index,
3226 // enclosing_method_method_index]
3227 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3228 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3229 _inner_classes = inner_classes;
3230
3231 int index = 0;
3232 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3233 for (int n = 0; n < length; n++) {
3234 // Inner class index
3235 const u2 inner_class_info_index = cfs->get_u2_fast();
3236 check_property(
3237 valid_klass_reference_at(inner_class_info_index),
3238 "inner_class_info_index %u has bad constant type in class file %s",
3239 inner_class_info_index, CHECK_0);
3240 // Outer class index
3241 const u2 outer_class_info_index = cfs->get_u2_fast();
3242 check_property(
3243 outer_class_info_index == 0 ||
3244 valid_klass_reference_at(outer_class_info_index),
3245 "outer_class_info_index %u has bad constant type in class file %s",
3246 outer_class_info_index, CHECK_0);
3247 // Inner class name
3248 const u2 inner_name_index = cfs->get_u2_fast();
3249 check_property(
3250 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3251 "inner_name_index %u has bad constant type in class file %s",
3252 inner_name_index, CHECK_0);
3253 if (_need_verify) {
3254 guarantee_property(inner_class_info_index != outer_class_info_index,
3255 "Class is both outer and inner class in class file %s", CHECK_0);
3256 }
3257
3258 jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3259 // JVM_ACC_MODULE is defined in JDK-9 and later.
3260 if (_major_version >= JAVA_9_VERSION) {
3261 recognized_modifiers |= JVM_ACC_MODULE;
3262 }
3263 // JVM_ACC_VALUE is defined for class file version 55 and later
3264 if (supports_value_types()) {
3265 recognized_modifiers |= JVM_ACC_VALUE;
3266 }
3267
3268 // Access flags
3269 jint flags = cfs->get_u2_fast() & recognized_modifiers;
3270
3271 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3272 // Set abstract bit for old class files for backward compatibility
3273 flags |= JVM_ACC_ABSTRACT;
3274 }
3275 verify_legal_class_modifiers(flags, CHECK_0);
3276 AccessFlags inner_access_flags(flags);
3277
3278 inner_classes->at_put(index++, inner_class_info_index);
3279 inner_classes->at_put(index++, outer_class_info_index);
3280 inner_classes->at_put(index++, inner_name_index);
3281 inner_classes->at_put(index++, inner_access_flags.as_short());
3282 }
3283
3284 // 4347400: make sure there's no duplicate entry in the classes array
3285 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3286 for(int i = 0; i < length * 4; i += 4) {
3287 for(int j = i + 4; j < length * 4; j += 4) {
3288 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3289 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3290 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3291 inner_classes->at(i+3) != inner_classes->at(j+3)),
3292 "Duplicate entry in InnerClasses in class file %s",
3293 CHECK_0);
3294 }
3295 }
3296 }
3297
3298 // Set EnclosingMethod class and method indexes.
3299 if (parsed_enclosingmethod_attribute) {
3300 inner_classes->at_put(index++, enclosing_method_class_index);
3301 inner_classes->at_put(index++, enclosing_method_method_index);
3302 }
3303 assert(index == size, "wrong size");
3304
3305 // Restore buffer's current position.
3306 cfs->set_current(current_mark);
3307
3308 return length;
3309 }
3310
3311 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3312 const u1* const nest_members_attribute_start,
3313 TRAPS) {
3314 const u1* const current_mark = cfs->current();
3315 u2 length = 0;
3316 if (nest_members_attribute_start != NULL) {
3317 cfs->set_current(nest_members_attribute_start);
3318 cfs->guarantee_more(2, CHECK_0); // length
3319 length = cfs->get_u2_fast();
3320 }
3321 const int size = length;
3322 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3323 _nest_members = nest_members;
3324
3325 int index = 0;
3326 cfs->guarantee_more(2 * length, CHECK_0);
3327 for (int n = 0; n < length; n++) {
3328 const u2 class_info_index = cfs->get_u2_fast();
3329 check_property(
3330 valid_klass_reference_at(class_info_index),
3331 "Nest member class_info_index %u has bad constant type in class file %s",
3332 class_info_index, CHECK_0);
3333 nest_members->at_put(index++, class_info_index);
3334 }
3335 assert(index == size, "wrong size");
3336
3337 // Restore buffer's current position.
3338 cfs->set_current(current_mark);
3339
3340 return length;
3341 }
3342
3343 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3344 set_class_synthetic_flag(true);
3345 }
3346
3347 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3348 assert(cfs != NULL, "invariant");
3349
3350 const u2 signature_index = cfs->get_u2(CHECK);
3351 check_property(
3352 valid_symbol_at(signature_index),
3353 "Invalid constant pool index %u in Signature attribute in class file %s",
3354 signature_index, CHECK);
3355 set_class_generic_signature_index(signature_index);
3356 }
3357
3358 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3359 ConstantPool* cp,
3360 u4 attribute_byte_length,
3361 TRAPS) {
3362 assert(cfs != NULL, "invariant");
3363 assert(cp != NULL, "invariant");
3364
3365 const u1* const current_start = cfs->current();
3366
3367 guarantee_property(attribute_byte_length >= sizeof(u2),
3368 "Invalid BootstrapMethods attribute length %u in class file %s",
3369 attribute_byte_length,
3370 CHECK);
3371
3372 cfs->guarantee_more(attribute_byte_length, CHECK);
3373
3374 const int attribute_array_length = cfs->get_u2_fast();
3375
3376 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3377 "Short length on BootstrapMethods in class file %s",
3378 CHECK);
3379
3380
3381 // The attribute contains a counted array of counted tuples of shorts,
3382 // represending bootstrap specifiers:
3383 // length*{bootstrap_method_index, argument_count*{argument_index}}
3384 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3385 // operand_count = number of shorts in attr, except for leading length
3386
3387 // The attribute is copied into a short[] array.
3388 // The array begins with a series of short[2] pairs, one for each tuple.
3389 const int index_size = (attribute_array_length * 2);
3390
3391 Array<u2>* const operands =
3392 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3393
3394 // Eagerly assign operands so they will be deallocated with the constant
3395 // pool if there is an error.
3396 cp->set_operands(operands);
3397
3398 int operand_fill_index = index_size;
3399 const int cp_size = cp->length();
3400
3401 for (int n = 0; n < attribute_array_length; n++) {
3402 // Store a 32-bit offset into the header of the operand array.
3403 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3404
3405 // Read a bootstrap specifier.
3406 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3407 const u2 bootstrap_method_index = cfs->get_u2_fast();
3408 const u2 argument_count = cfs->get_u2_fast();
3409 check_property(
3410 valid_cp_range(bootstrap_method_index, cp_size) &&
3411 cp->tag_at(bootstrap_method_index).is_method_handle(),
3412 "bootstrap_method_index %u has bad constant type in class file %s",
3413 bootstrap_method_index,
3414 CHECK);
3415
3416 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3417 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3418 CHECK);
3419
3420 operands->at_put(operand_fill_index++, bootstrap_method_index);
3421 operands->at_put(operand_fill_index++, argument_count);
3422
3423 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3424 for (int j = 0; j < argument_count; j++) {
3425 const u2 argument_index = cfs->get_u2_fast();
3426 check_property(
3427 valid_cp_range(argument_index, cp_size) &&
3428 cp->tag_at(argument_index).is_loadable_constant(),
3429 "argument_index %u has bad constant type in class file %s",
3430 argument_index,
3431 CHECK);
3432 operands->at_put(operand_fill_index++, argument_index);
3433 }
3434 }
3435 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3436 "Bad length on BootstrapMethods in class file %s",
3437 CHECK);
3438 }
3439
3440 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3441 ConstantPool* cp,
3442 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3443 TRAPS) {
3444 assert(cfs != NULL, "invariant");
3445 assert(cp != NULL, "invariant");
3446 assert(parsed_annotations != NULL, "invariant");
3447
3448 // Set inner classes attribute to default sentinel
3449 _inner_classes = Universe::the_empty_short_array();
3450 // Set nest members attribute to default sentinel
3451 _nest_members = Universe::the_empty_short_array();
3452 cfs->guarantee_more(2, CHECK); // attributes_count
3453 u2 attributes_count = cfs->get_u2_fast();
3454 bool parsed_sourcefile_attribute = false;
3455 bool parsed_innerclasses_attribute = false;
3456 bool parsed_nest_members_attribute = false;
3457 bool parsed_nest_host_attribute = false;
3458 bool parsed_enclosingmethod_attribute = false;
3459 bool parsed_bootstrap_methods_attribute = false;
3460 const u1* runtime_visible_annotations = NULL;
3461 int runtime_visible_annotations_length = 0;
3462 const u1* runtime_invisible_annotations = NULL;
3463 int runtime_invisible_annotations_length = 0;
3464 const u1* runtime_visible_type_annotations = NULL;
3465 int runtime_visible_type_annotations_length = 0;
3466 const u1* runtime_invisible_type_annotations = NULL;
3467 int runtime_invisible_type_annotations_length = 0;
3468 bool runtime_invisible_type_annotations_exists = false;
3469 bool runtime_invisible_annotations_exists = false;
3470 bool parsed_source_debug_ext_annotations_exist = false;
3471 const u1* inner_classes_attribute_start = NULL;
3472 u4 inner_classes_attribute_length = 0;
3473 const u1* value_types_attribute_start = NULL;
3474 u4 value_types_attribute_length = 0;
3475 u2 enclosing_method_class_index = 0;
3476 u2 enclosing_method_method_index = 0;
3477 const u1* nest_members_attribute_start = NULL;
3478 u4 nest_members_attribute_length = 0;
3479
3480 // Iterate over attributes
3481 while (attributes_count--) {
3482 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3483 const u2 attribute_name_index = cfs->get_u2_fast();
3484 const u4 attribute_length = cfs->get_u4_fast();
3485 check_property(
3486 valid_symbol_at(attribute_name_index),
3487 "Attribute name has bad constant pool index %u in class file %s",
3488 attribute_name_index, CHECK);
3489 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3490 if (tag == vmSymbols::tag_source_file()) {
3491 // Check for SourceFile tag
3492 if (_need_verify) {
3493 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3494 }
3495 if (parsed_sourcefile_attribute) {
3496 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3497 } else {
3498 parsed_sourcefile_attribute = true;
3499 }
3500 parse_classfile_sourcefile_attribute(cfs, CHECK);
3501 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3502 // Check for SourceDebugExtension tag
3503 if (parsed_source_debug_ext_annotations_exist) {
3504 classfile_parse_error(
3505 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3506 }
3507 parsed_source_debug_ext_annotations_exist = true;
3508 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3509 } else if (tag == vmSymbols::tag_inner_classes()) {
3510 // Check for InnerClasses tag
3511 if (parsed_innerclasses_attribute) {
3512 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3513 } else {
3514 parsed_innerclasses_attribute = true;
3515 }
3516 inner_classes_attribute_start = cfs->current();
3517 inner_classes_attribute_length = attribute_length;
3518 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3519 } else if (tag == vmSymbols::tag_synthetic()) {
3520 // Check for Synthetic tag
3521 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3522 if (attribute_length != 0) {
3523 classfile_parse_error(
3524 "Invalid Synthetic classfile attribute length %u in class file %s",
3525 attribute_length, CHECK);
3526 }
3527 parse_classfile_synthetic_attribute(CHECK);
3528 } else if (tag == vmSymbols::tag_deprecated()) {
3529 // Check for Deprecatd tag - 4276120
3530 if (attribute_length != 0) {
3531 classfile_parse_error(
3532 "Invalid Deprecated classfile attribute length %u in class file %s",
3533 attribute_length, CHECK);
3534 }
3535 } else if (_major_version >= JAVA_1_5_VERSION) {
3536 if (tag == vmSymbols::tag_signature()) {
3537 if (_generic_signature_index != 0) {
3538 classfile_parse_error(
3539 "Multiple Signature attributes in class file %s", CHECK);
3540 }
3541 if (attribute_length != 2) {
3542 classfile_parse_error(
3543 "Wrong Signature attribute length %u in class file %s",
3544 attribute_length, CHECK);
3545 }
3546 parse_classfile_signature_attribute(cfs, CHECK);
3547 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3548 if (runtime_visible_annotations != NULL) {
3549 classfile_parse_error(
3550 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3551 }
3552 runtime_visible_annotations_length = attribute_length;
3553 runtime_visible_annotations = cfs->current();
3554 assert(runtime_visible_annotations != NULL, "null visible annotations");
3555 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3556 parse_annotations(cp,
3557 runtime_visible_annotations,
3558 runtime_visible_annotations_length,
3559 parsed_annotations,
3560 _loader_data,
3561 CHECK);
3562 cfs->skip_u1_fast(runtime_visible_annotations_length);
3563 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3564 if (runtime_invisible_annotations_exists) {
3565 classfile_parse_error(
3566 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3567 }
3568 runtime_invisible_annotations_exists = true;
3569 if (PreserveAllAnnotations) {
3570 runtime_invisible_annotations_length = attribute_length;
3571 runtime_invisible_annotations = cfs->current();
3572 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3573 }
3574 cfs->skip_u1(attribute_length, CHECK);
3575 } else if (tag == vmSymbols::tag_enclosing_method()) {
3576 if (parsed_enclosingmethod_attribute) {
3577 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3578 } else {
3579 parsed_enclosingmethod_attribute = true;
3580 }
3581 guarantee_property(attribute_length == 4,
3582 "Wrong EnclosingMethod attribute length %u in class file %s",
3583 attribute_length, CHECK);
3584 cfs->guarantee_more(4, CHECK); // class_index, method_index
3585 enclosing_method_class_index = cfs->get_u2_fast();
3586 enclosing_method_method_index = cfs->get_u2_fast();
3587 if (enclosing_method_class_index == 0) {
3588 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3589 }
3590 // Validate the constant pool indices and types
3591 check_property(valid_klass_reference_at(enclosing_method_class_index),
3592 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3593 if (enclosing_method_method_index != 0 &&
3594 (!cp->is_within_bounds(enclosing_method_method_index) ||
3595 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3596 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3597 }
3598 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3599 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3600 if (parsed_bootstrap_methods_attribute) {
3601 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3602 }
3603 parsed_bootstrap_methods_attribute = true;
3604 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3605 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3606 if (runtime_visible_type_annotations != NULL) {
3607 classfile_parse_error(
3608 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3609 }
3610 runtime_visible_type_annotations_length = attribute_length;
3611 runtime_visible_type_annotations = cfs->current();
3612 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3613 // No need for the VM to parse Type annotations
3614 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3615 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3616 if (runtime_invisible_type_annotations_exists) {
3617 classfile_parse_error(
3618 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3619 } else {
3620 runtime_invisible_type_annotations_exists = true;
3621 }
3622 if (PreserveAllAnnotations) {
3623 runtime_invisible_type_annotations_length = attribute_length;
3624 runtime_invisible_type_annotations = cfs->current();
3625 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3626 }
3627 cfs->skip_u1(attribute_length, CHECK);
3628 } else if (_major_version >= JAVA_11_VERSION) {
3629 if (tag == vmSymbols::tag_nest_members()) {
3630 // Check for NestMembers tag
3631 if (parsed_nest_members_attribute) {
3632 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK);
3633 } else {
3634 parsed_nest_members_attribute = true;
3635 }
3636 if (parsed_nest_host_attribute) {
3637 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK);
3638 }
3639 nest_members_attribute_start = cfs->current();
3640 nest_members_attribute_length = attribute_length;
3641 cfs->skip_u1(nest_members_attribute_length, CHECK);
3642 } else if (tag == vmSymbols::tag_nest_host()) {
3643 if (parsed_nest_host_attribute) {
3644 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK);
3645 } else {
3646 parsed_nest_host_attribute = true;
3647 }
3648 if (parsed_nest_members_attribute) {
3649 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK);
3650 }
3651 if (_need_verify) {
3652 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3653 }
3654 cfs->guarantee_more(2, CHECK);
3655 u2 class_info_index = cfs->get_u2_fast();
3656 check_property(
3657 valid_klass_reference_at(class_info_index),
3658 "Nest-host class_info_index %u has bad constant type in class file %s",
3659 class_info_index, CHECK);
3660 _nest_host = class_info_index;
3661 } else {
3662 // Unknown attribute
3663 cfs->skip_u1(attribute_length, CHECK);
3664 }
3665 } else {
3666 // Unknown attribute
3667 cfs->skip_u1(attribute_length, CHECK);
3668 }
3669 } else {
3670 // Unknown attribute
3671 cfs->skip_u1(attribute_length, CHECK);
3672 }
3673 }
3674 _annotations = assemble_annotations(runtime_visible_annotations,
3675 runtime_visible_annotations_length,
3676 runtime_invisible_annotations,
3677 runtime_invisible_annotations_length,
3678 CHECK);
3679 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3680 runtime_visible_type_annotations_length,
3681 runtime_invisible_type_annotations,
3682 runtime_invisible_type_annotations_length,
3683 CHECK);
3684
3685 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3686 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3687 cfs,
3688 inner_classes_attribute_start,
3689 parsed_innerclasses_attribute,
3690 enclosing_method_class_index,
3691 enclosing_method_method_index,
3692 CHECK);
3693 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3694 guarantee_property(
3695 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3696 "Wrong InnerClasses attribute length in class file %s", CHECK);
3697 }
3698 }
3699
3700 if (parsed_nest_members_attribute) {
3701 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3702 cfs,
3703 nest_members_attribute_start,
3704 CHECK);
3705 if (_need_verify) {
3706 guarantee_property(
3707 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3708 "Wrong NestMembers attribute length in class file %s", CHECK);
3709 }
3710 }
3711
3712 if (_max_bootstrap_specifier_index >= 0) {
3713 guarantee_property(parsed_bootstrap_methods_attribute,
3714 "Missing BootstrapMethods attribute in class file %s", CHECK);
3715 }
3716 }
3717
3718 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3719 assert(k != NULL, "invariant");
3720
3721 if (_synthetic_flag)
3722 k->set_is_synthetic();
3723 if (_sourcefile_index != 0) {
3724 k->set_source_file_name_index(_sourcefile_index);
3725 }
3726 if (_generic_signature_index != 0) {
3727 k->set_generic_signature_index(_generic_signature_index);
3728 }
3729 if (_sde_buffer != NULL) {
3730 k->set_source_debug_extension(_sde_buffer, _sde_length);
3731 }
3732 }
3733
3734 // Create the Annotations object that will
3735 // hold the annotations array for the Klass.
3736 void ClassFileParser::create_combined_annotations(TRAPS) {
3737 if (_annotations == NULL &&
3738 _type_annotations == NULL &&
3739 _fields_annotations == NULL &&
3740 _fields_type_annotations == NULL) {
3741 // Don't create the Annotations object unnecessarily.
3742 return;
3743 }
3744
3745 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3746 annotations->set_class_annotations(_annotations);
3747 annotations->set_class_type_annotations(_type_annotations);
3748 annotations->set_fields_annotations(_fields_annotations);
3749 annotations->set_fields_type_annotations(_fields_type_annotations);
3750
3751 // This is the Annotations object that will be
3752 // assigned to InstanceKlass being constructed.
3753 _combined_annotations = annotations;
3754
3755 // The annotations arrays below has been transfered the
3756 // _combined_annotations so these fields can now be cleared.
3757 _annotations = NULL;
3758 _type_annotations = NULL;
3759 _fields_annotations = NULL;
3760 _fields_type_annotations = NULL;
3761 }
3762
3763 // Transfer ownership of metadata allocated to the InstanceKlass.
3764 void ClassFileParser::apply_parsed_class_metadata(
3765 InstanceKlass* this_klass,
3766 int java_fields_count, TRAPS) {
3767 assert(this_klass != NULL, "invariant");
3768
3769 _cp->set_pool_holder(this_klass);
3770 this_klass->set_constants(_cp);
3771 this_klass->set_fields(_fields, java_fields_count);
3772 this_klass->set_methods(_methods);
3773 this_klass->set_inner_classes(_inner_classes);
3774 this_klass->set_nest_members(_nest_members);
3775 this_klass->set_nest_host_index(_nest_host);
3776 this_klass->set_local_interfaces(_local_interfaces);
3777 this_klass->set_annotations(_combined_annotations);
3778 // Delay the setting of _transitive_interfaces until after initialize_supers() in
3779 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with
3780 // its _super. If an OOM occurs while loading the current klass, its _super field
3781 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3782 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3783 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3784
3785 // Clear out these fields so they don't get deallocated by the destructor
3786 clear_class_metadata();
3787 }
3788
3789 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3790 int runtime_visible_annotations_length,
3791 const u1* const runtime_invisible_annotations,
3792 int runtime_invisible_annotations_length,
3793 TRAPS) {
3794 AnnotationArray* annotations = NULL;
3795 if (runtime_visible_annotations != NULL ||
3796 runtime_invisible_annotations != NULL) {
3797 annotations = MetadataFactory::new_array<u1>(_loader_data,
3798 runtime_visible_annotations_length +
3799 runtime_invisible_annotations_length,
3800 CHECK_(annotations));
3801 if (runtime_visible_annotations != NULL) {
3802 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3803 annotations->at_put(i, runtime_visible_annotations[i]);
3804 }
3805 }
3806 if (runtime_invisible_annotations != NULL) {
3807 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3808 int append = runtime_visible_annotations_length+i;
3809 annotations->at_put(append, runtime_invisible_annotations[i]);
3810 }
3811 }
3812 }
3813 return annotations;
3814 }
3815
3816 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3817 const int super_class_index,
3818 const bool need_verify,
3819 TRAPS) {
3820 assert(cp != NULL, "invariant");
3821 const InstanceKlass* super_klass = NULL;
3822
3823 if (super_class_index == 0) {
3824 check_property(_class_name == vmSymbols::java_lang_Object()
3825 || (_access_flags.get_flags() & JVM_ACC_VALUE),
3826 "Invalid superclass index %u in class file %s",
3827 super_class_index,
3828 CHECK_NULL);
3829 } else {
3830 check_property(valid_klass_reference_at(super_class_index),
3831 "Invalid superclass index %u in class file %s",
3832 super_class_index,
3833 CHECK_NULL);
3834 // The class name should be legal because it is checked when parsing constant pool.
3835 // However, make sure it is not an array type.
3836 bool is_array = false;
3837 if (cp->tag_at(super_class_index).is_klass()) {
3838 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3839 if (need_verify)
3840 is_array = super_klass->is_array_klass();
3841 } else if (need_verify) {
3842 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3843 }
3844 if (need_verify) {
3845 guarantee_property(!is_array,
3846 "Bad superclass name in class file %s", CHECK_NULL);
3847 }
3848 }
3849 return super_klass;
3850 }
3851
3852 #ifndef PRODUCT
3853 static void print_field_layout(const Symbol* name,
3854 Array<u2>* fields,
3855 const constantPoolHandle& cp,
3856 int instance_size,
3857 int instance_fields_start,
3858 int instance_fields_end,
3859 int static_fields_end) {
3860
3861 assert(name != NULL, "invariant");
3862
3863 tty->print("%s: field layout\n", name->as_klass_external_name());
3864 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3865 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3866 if (!fs.access_flags().is_static()) {
3867 tty->print(" @%3d \"%s\" %s\n",
3868 fs.offset(),
3869 fs.name()->as_klass_external_name(),
3870 fs.signature()->as_klass_external_name());
3871 }
3872 }
3873 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3874 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3875 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3876 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3877 if (fs.access_flags().is_static()) {
3878 tty->print(" @%3d \"%s\" %s\n",
3879 fs.offset(),
3880 fs.name()->as_klass_external_name(),
3881 fs.signature()->as_klass_external_name());
3882 }
3883 }
3884 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3885 tty->print("\n");
3886 }
3887 #endif
3888
3889 // Values needed for oopmap and InstanceKlass creation
3890 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3891 public:
3892 OopMapBlocksBuilder* oop_map_blocks;
3893 int instance_size;
3894 int nonstatic_field_size;
3895 int static_field_size;
3896 bool has_nonstatic_fields;
3897 };
3898
3899 // Utility to collect and compact oop maps during layout
3900 class ClassFileParser::OopMapBlocksBuilder : public ResourceObj {
3901 public:
3902 OopMapBlock* nonstatic_oop_maps;
3903 unsigned int nonstatic_oop_map_count;
3904 unsigned int max_nonstatic_oop_maps;
3905
3906 public:
3907 OopMapBlocksBuilder(unsigned int max_blocks, TRAPS) {
3908 max_nonstatic_oop_maps = max_blocks;
3909 nonstatic_oop_map_count = 0;
3910 if (max_blocks == 0) {
3911 nonstatic_oop_maps = NULL;
3912 } else {
3913 nonstatic_oop_maps = NEW_RESOURCE_ARRAY_IN_THREAD(
3914 THREAD, OopMapBlock, max_nonstatic_oop_maps);
3915 memset(nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3916 }
3917 }
3918
3919 OopMapBlock* last_oop_map() const {
3920 assert(nonstatic_oop_map_count > 0, "Has no oop maps");
3921 return nonstatic_oop_maps + (nonstatic_oop_map_count - 1);
3922 }
3923
3924 // addition of super oop maps
3925 void initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3926 assert(nof_blocks && nonstatic_oop_map_count == 0 &&
3927 nof_blocks <= max_nonstatic_oop_maps, "invariant");
3928
3929 memcpy(nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3930 nonstatic_oop_map_count += nof_blocks;
3931 }
3932
3933 // collection of oops
3934 void add(int offset, int count) {
3935 if (nonstatic_oop_map_count == 0) {
3936 nonstatic_oop_map_count++;
3937 }
3938 OopMapBlock* nonstatic_oop_map = last_oop_map();
3939 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
3940 nonstatic_oop_map->set_offset(offset);
3941 nonstatic_oop_map->set_count(count);
3942 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
3943 nonstatic_oop_map->increment_count(count);
3944 } else { // Need a new one...
3945 nonstatic_oop_map_count++;
3946 assert(nonstatic_oop_map_count <= max_nonstatic_oop_maps, "range check");
3947 nonstatic_oop_map = last_oop_map();
3948 nonstatic_oop_map->set_offset(offset);
3949 nonstatic_oop_map->set_count(count);
3950 }
3951 }
3952
3953 // general purpose copy, e.g. into allocated instanceKlass
3954 void copy(OopMapBlock* dst) {
3955 if (nonstatic_oop_map_count != 0) {
3956 memcpy(dst, nonstatic_oop_maps, sizeof(OopMapBlock) * nonstatic_oop_map_count);
3957 }
3958 }
3959
3960 // Sort and compact adjacent blocks
3961 void compact(TRAPS) {
3962 if (nonstatic_oop_map_count <= 1) {
3963 return;
3964 }
3965 /*
3966 * Since field layout sneeks in oops before values, we will be able to condense
3967 * blocks. There is potential to compact between super, own refs and values
3968 * containing refs.
3969 *
3970 * Currently compaction is slightly limited due to values being 8 byte aligned.
3971 * This may well change: FixMe if doesn't, the code below is fairly general purpose
3972 * and maybe it doesn't need to be.
3973 */
3974 qsort(nonstatic_oop_maps, nonstatic_oop_map_count, sizeof(OopMapBlock),
3975 (_sort_Fn)OopMapBlock::compare_offset);
3976 if (nonstatic_oop_map_count < 2) {
3977 return;
3978 }
3979
3980 //Make a temp copy, and iterate through and copy back into the orig
3981 ResourceMark rm(THREAD);
3982 OopMapBlock* oop_maps_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, OopMapBlock,
3983 nonstatic_oop_map_count);
3984 OopMapBlock* oop_maps_copy_end = oop_maps_copy + nonstatic_oop_map_count;
3985 copy(oop_maps_copy);
3986 OopMapBlock* nonstatic_oop_map = nonstatic_oop_maps;
3987 unsigned int new_count = 1;
3988 oop_maps_copy++;
3989 while(oop_maps_copy < oop_maps_copy_end) {
3990 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
3991 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
3992 nonstatic_oop_map->increment_count(oop_maps_copy->count());
3993 } else {
3994 nonstatic_oop_map++;
3995 new_count++;
3996 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
3997 nonstatic_oop_map->set_count(oop_maps_copy->count());
3998 }
3999 oop_maps_copy++;
4000 }
4001 assert(new_count <= nonstatic_oop_map_count, "end up with more maps after compact() ?");
4002 nonstatic_oop_map_count = new_count;
4003 }
4004
4005 void print_on(outputStream* st) const {
4006 st->print_cr(" OopMapBlocks: %3d /%3d", nonstatic_oop_map_count, max_nonstatic_oop_maps);
4007 if (nonstatic_oop_map_count > 0) {
4008 OopMapBlock* map = nonstatic_oop_maps;
4009 OopMapBlock* last_map = last_oop_map();
4010 assert(map <= last_map, "Last less than first");
4011 while (map <= last_map) {
4012 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4013 map->offset() + map->offset_span() - heapOopSize, map->count());
4014 map++;
4015 }
4016 }
4017 }
4018
4019 void print_value_on(outputStream* st) const {
4020 print_on(st);
4021 }
4022
4023 };
4024
4025 void ClassFileParser::throwValueTypeLimitation(THREAD_AND_LOCATION_DECL,
4026 const char* msg,
4027 const Symbol* name,
4028 const Symbol* sig) const {
4029
4030 ResourceMark rm(THREAD);
4031 if (name == NULL || sig == NULL) {
4032 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
4033 vmSymbols::java_lang_ClassFormatError(),
4034 "class: %s - %s", _class_name->as_C_string(), msg);
4035 }
4036 else {
4037 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
4038 vmSymbols::java_lang_ClassFormatError(),
4039 "\"%s\" sig: \"%s\" class: %s - %s", name->as_C_string(), sig->as_C_string(),
4040 _class_name->as_C_string(), msg);
4041 }
4042 }
4043
4044 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
4045 void ClassFileParser::layout_fields(ConstantPool* cp,
4046 const FieldAllocationCount* fac,
4047 const ClassAnnotationCollector* parsed_annotations,
4048 FieldLayoutInfo* info,
4049 TRAPS) {
4050
4051 assert(cp != NULL, "invariant");
4052
4053 // Field size and offset computation
4054 int nonstatic_field_size = _super_klass == NULL ? 0 :
4055 _super_klass->nonstatic_field_size();
4056 int next_nonstatic_valuetype_offset = 0;
4057 int first_nonstatic_valuetype_offset = 0;
4058
4059 // Fields that are value types are handled differently depending if they are static or not:
4060 // - static fields are oops
4061 // - non-static fields are embedded
4062
4063 // Count the contended fields by type.
4064 //
4065 // We ignore static fields, because @Contended is not supported for them.
4066 // The layout code below will also ignore the static fields.
4067 int nonstatic_contended_count = 0;
4068 FieldAllocationCount fac_contended;
4069 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4070 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4071 if (fs.is_contended()) {
4072 fac_contended.count[atype]++;
4073 if (!fs.access_flags().is_static()) {
4074 nonstatic_contended_count++;
4075 }
4076 }
4077 }
4078
4079
4080 // Calculate the starting byte offsets
4081 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
4082 // Value types in static fields are not embedded, they are handled with oops
4083 int next_static_double_offset = next_static_oop_offset +
4084 ((fac->count[STATIC_OOP] + fac->count[STATIC_FLATTENABLE]) * heapOopSize);
4085 if (fac->count[STATIC_DOUBLE]) {
4086 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
4087 }
4088
4089 int next_static_word_offset = next_static_double_offset +
4090 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
4091 int next_static_short_offset = next_static_word_offset +
4092 ((fac->count[STATIC_WORD]) * BytesPerInt);
4093 int next_static_byte_offset = next_static_short_offset +
4094 ((fac->count[STATIC_SHORT]) * BytesPerShort);
4095
4096 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
4097 nonstatic_field_size * heapOopSize;
4098
4099 // First field of value types is aligned on a long boundary in order to ease
4100 // in-lining of value types (with header removal) in packed arrays and
4101 // flatten value types
4102 int initial_value_type_padding = 0;
4103 if (is_value_type()) {
4104 int old = nonstatic_fields_start;
4105 nonstatic_fields_start = align_up(nonstatic_fields_start, BytesPerLong);
4106 initial_value_type_padding = nonstatic_fields_start - old;
4107 }
4108
4109 int next_nonstatic_field_offset = nonstatic_fields_start;
4110
4111 const bool is_contended_class = parsed_annotations->is_contended();
4112
4113 // Class is contended, pad before all the fields
4114 if (is_contended_class) {
4115 next_nonstatic_field_offset += ContendedPaddingWidth;
4116 }
4117
4118 // Temporary value types restrictions
4119 if (is_value_type()) {
4120 if (is_contended_class) {
4121 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support @Contended annotation yet");
4122 return;
4123 }
4124 }
4125
4126 // Compute the non-contended fields count.
4127 // The packing code below relies on these counts to determine if some field
4128 // can be squeezed into the alignment gap. Contended fields are obviously
4129 // exempt from that.
4130 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
4131 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
4132 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
4133 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
4134 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
4135
4136 int static_value_type_count = 0;
4137 int nonstatic_value_type_count = 0;
4138 int* nonstatic_value_type_indexes = NULL;
4139 Klass** nonstatic_value_type_klasses = NULL;
4140 unsigned int value_type_oop_map_count = 0;
4141 int not_flattened_value_types = 0;
4142
4143 int max_nonstatic_value_type = fac->count[NONSTATIC_FLATTENABLE] + 1;
4144
4145 nonstatic_value_type_indexes = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, int,
4146 max_nonstatic_value_type);
4147 for (int i = 0; i < max_nonstatic_value_type; i++) {
4148 nonstatic_value_type_indexes[i] = -1;
4149 }
4150 nonstatic_value_type_klasses = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, Klass*,
4151 max_nonstatic_value_type);
4152
4153 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
4154 if (fs.allocation_type() == STATIC_FLATTENABLE) {
4155 // Pre-resolve the flattenable field and check for value type circularity
4156 // issues. Note that super-class circularity checks are not needed here
4157 // because flattenable fields can only be in value types and value types
4158 // only have java.lang.Object as their super class.
4159 // Also, note that super-interface circularity checks are not needed
4160 // because interfaces cannot be value types.
4161 ResourceMark rm;
4162 if (!fs.signature()->is_Q_signature()) {
4163 THROW(vmSymbols::java_lang_ClassFormatError());
4164 }
4165 Klass* klass =
4166 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4167 Handle(THREAD, _loader_data->class_loader()),
4168 _protection_domain, true, CHECK);
4169 assert(klass != NULL, "Sanity check");
4170 if (!klass->access_flags().is_value_type()) {
4171 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4172 }
4173 static_value_type_count++;
4174 } else if (fs.allocation_type() == NONSTATIC_FLATTENABLE) {
4175 // Pre-resolve the flattenable field and check for value type circularity issues.
4176 ResourceMark rm;
4177 if (!fs.signature()->is_Q_signature()) {
4178 THROW(vmSymbols::java_lang_ClassFormatError());
4179 }
4180 Klass* klass =
4181 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4182 Handle(THREAD, _loader_data->class_loader()),
4183 _protection_domain, true, CHECK);
4184 assert(klass != NULL, "Sanity check");
4185 if (!klass->access_flags().is_value_type()) {
4186 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4187 }
4188 ValueKlass* vk = ValueKlass::cast(klass);
4189 // Conditions to apply flattening or not should be defined in a single place
4190 if ((ValueFieldMaxFlatSize < 0) || (vk->size_helper() * HeapWordSize) <= ValueFieldMaxFlatSize) {
4191 nonstatic_value_type_indexes[nonstatic_value_type_count] = fs.index();
4192 nonstatic_value_type_klasses[nonstatic_value_type_count] = klass;
4193 nonstatic_value_type_count++;
4194
4195 ValueKlass* vklass = ValueKlass::cast(klass);
4196 if (vklass->contains_oops()) {
4197 value_type_oop_map_count += vklass->nonstatic_oop_map_count();
4198 }
4199 fs.set_flattened(true);
4200 } else {
4201 not_flattened_value_types++;
4202 fs.set_flattened(false);
4203 }
4204 }
4205 }
4206
4207 // Adjusting non_static_oop_count to take into account not flattened value types;
4208 nonstatic_oop_count += not_flattened_value_types;
4209
4210 // Total non-static fields count, including every contended field
4211 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
4212 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
4213 fac->count[NONSTATIC_OOP] + fac->count[NONSTATIC_FLATTENABLE];
4214
4215 const bool super_has_nonstatic_fields =
4216 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
4217 const bool has_nonstatic_fields =
4218 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
4219 const bool has_nonstatic_value_fields = nonstatic_value_type_count > 0;
4220
4221 if (is_value_type() && (!has_nonstatic_fields)) {
4222 // There are a number of fixes required throughout the type system and JIT
4223 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support zero instance size yet");
4224 return;
4225 }
4226
4227 // Prepare list of oops for oop map generation.
4228 //
4229 // "offset" and "count" lists are describing the set of contiguous oop
4230 // regions. offset[i] is the start of the i-th region, which then has
4231 // count[i] oops following. Before we know how many regions are required,
4232 // we pessimistically allocate the maps to fit all the oops into the
4233 // distinct regions.
4234 //
4235 int super_oop_map_count = (_super_klass == NULL) ? 0 :_super_klass->nonstatic_oop_map_count();
4236 int max_oop_map_count =
4237 super_oop_map_count +
4238 fac->count[NONSTATIC_OOP] +
4239 value_type_oop_map_count +
4240 not_flattened_value_types;
4241
4242 OopMapBlocksBuilder* nonstatic_oop_maps = new OopMapBlocksBuilder(max_oop_map_count, THREAD);
4243 if (super_oop_map_count > 0) {
4244 nonstatic_oop_maps->initialize_inherited_blocks(_super_klass->start_of_nonstatic_oop_maps(),
4245 _super_klass->nonstatic_oop_map_count());
4246 }
4247
4248 int first_nonstatic_oop_offset = 0; // will be set for first oop field
4249
4250 bool compact_fields = CompactFields;
4251 int allocation_style = FieldsAllocationStyle;
4252 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
4253 assert(false, "0 <= FieldsAllocationStyle <= 2");
4254 allocation_style = 1; // Optimistic
4255 }
4256
4257 // The next classes have predefined hard-coded fields offsets
4258 // (see in JavaClasses::compute_hard_coded_offsets()).
4259 // Use default fields allocation order for them.
4260 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
4261 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
4262 _class_name == vmSymbols::java_lang_Class() ||
4263 _class_name == vmSymbols::java_lang_ClassLoader() ||
4264 _class_name == vmSymbols::java_lang_ref_Reference() ||
4265 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
4266 _class_name == vmSymbols::java_lang_StackTraceElement() ||
4267 _class_name == vmSymbols::java_lang_String() ||
4268 _class_name == vmSymbols::java_lang_Throwable() ||
4269 _class_name == vmSymbols::java_lang_Boolean() ||
4270 _class_name == vmSymbols::java_lang_Character() ||
4271 _class_name == vmSymbols::java_lang_Float() ||
4272 _class_name == vmSymbols::java_lang_Double() ||
4273 _class_name == vmSymbols::java_lang_Byte() ||
4274 _class_name == vmSymbols::java_lang_Short() ||
4275 _class_name == vmSymbols::java_lang_Integer() ||
4276 _class_name == vmSymbols::java_lang_Long())) {
4277 allocation_style = 0; // Allocate oops first
4278 compact_fields = false; // Don't compact fields
4279 }
4280
4281 int next_nonstatic_oop_offset = 0;
4282 int next_nonstatic_double_offset = 0;
4283
4284 // Rearrange fields for a given allocation style
4285 if( allocation_style == 0 ) {
4286 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
4287 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4288 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4289 (nonstatic_oop_count * heapOopSize);
4290 } else if( allocation_style == 1 ) {
4291 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
4292 next_nonstatic_double_offset = next_nonstatic_field_offset;
4293 } else if( allocation_style == 2 ) {
4294 // Fields allocation: oops fields in super and sub classes are together.
4295 if( nonstatic_field_size > 0 && super_oop_map_count > 0 ) {
4296 if (next_nonstatic_field_offset == nonstatic_oop_maps->last_oop_map()->end_offset()) {
4297 allocation_style = 0; // allocate oops first
4298 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4299 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4300 (nonstatic_oop_count * heapOopSize);
4301 }
4302 }
4303 if( allocation_style == 2 ) {
4304 allocation_style = 1; // allocate oops last
4305 next_nonstatic_double_offset = next_nonstatic_field_offset;
4306 }
4307 } else {
4308 ShouldNotReachHere();
4309 }
4310
4311 int nonstatic_oop_space_count = 0;
4312 int nonstatic_word_space_count = 0;
4313 int nonstatic_short_space_count = 0;
4314 int nonstatic_byte_space_count = 0;
4315 int nonstatic_oop_space_offset = 0;
4316 int nonstatic_word_space_offset = 0;
4317 int nonstatic_short_space_offset = 0;
4318 int nonstatic_byte_space_offset = 0;
4319
4320 // Try to squeeze some of the fields into the gaps due to
4321 // long/double alignment.
4322 if (nonstatic_double_count > 0) {
4323 int offset = next_nonstatic_double_offset;
4324 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
4325 if (compact_fields && offset != next_nonstatic_double_offset) {
4326 // Allocate available fields into the gap before double field.
4327 int length = next_nonstatic_double_offset - offset;
4328 assert(length == BytesPerInt, "");
4329 nonstatic_word_space_offset = offset;
4330 if (nonstatic_word_count > 0) {
4331 nonstatic_word_count -= 1;
4332 nonstatic_word_space_count = 1; // Only one will fit
4333 length -= BytesPerInt;
4334 offset += BytesPerInt;
4335 }
4336 nonstatic_short_space_offset = offset;
4337 while (length >= BytesPerShort && nonstatic_short_count > 0) {
4338 nonstatic_short_count -= 1;
4339 nonstatic_short_space_count += 1;
4340 length -= BytesPerShort;
4341 offset += BytesPerShort;
4342 }
4343 nonstatic_byte_space_offset = offset;
4344 while (length > 0 && nonstatic_byte_count > 0) {
4345 nonstatic_byte_count -= 1;
4346 nonstatic_byte_space_count += 1;
4347 length -= 1;
4348 }
4349 // Allocate oop field in the gap if there are no other fields for that.
4350 nonstatic_oop_space_offset = offset;
4351 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
4352 allocation_style != 0) { // when oop fields not first
4353 nonstatic_oop_count -= 1;
4354 nonstatic_oop_space_count = 1; // Only one will fit
4355 length -= heapOopSize;
4356 offset += heapOopSize;
4357 }
4358 }
4359 }
4360
4361 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4362 (nonstatic_double_count * BytesPerLong);
4363 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4364 (nonstatic_word_count * BytesPerInt);
4365 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4366 (nonstatic_short_count * BytesPerShort);
4367 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4368 nonstatic_byte_count;
4369
4370 // let oops jump before padding with this allocation style
4371 if( allocation_style == 1 ) {
4372 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4373 if( nonstatic_oop_count > 0 ) {
4374 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4375 }
4376 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4377 }
4378
4379 // Aligning embedded value types
4380 // bug below, the current algorithm to layout embedded value types always put them at the
4381 // end of the layout, which doesn't match the different allocation policies the VM is
4382 // supposed to provide => FixMe
4383 // Note also that the current alignment policy is to make each value type starting on a
4384 // 64 bits boundary. This could be optimized later. For instance, it could be nice to
4385 // align value types according to their most constrained internal type.
4386 next_nonstatic_valuetype_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4387 int next_value_type_index = 0;
4388
4389 // Iterate over fields again and compute correct offsets.
4390 // The field allocation type was temporarily stored in the offset slot.
4391 // oop fields are located before non-oop fields (static and non-static).
4392 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4393
4394 // skip already laid out fields
4395 if (fs.is_offset_set()) continue;
4396
4397 // contended instance fields are handled below
4398 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4399
4400 int real_offset = 0;
4401 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4402
4403 // pack the rest of the fields
4404 switch (atype) {
4405 // Value types in static fields are handled with oops
4406 case STATIC_FLATTENABLE: // Fallthrough
4407 case STATIC_OOP:
4408 real_offset = next_static_oop_offset;
4409 next_static_oop_offset += heapOopSize;
4410 break;
4411 case STATIC_BYTE:
4412 real_offset = next_static_byte_offset;
4413 next_static_byte_offset += 1;
4414 break;
4415 case STATIC_SHORT:
4416 real_offset = next_static_short_offset;
4417 next_static_short_offset += BytesPerShort;
4418 break;
4419 case STATIC_WORD:
4420 real_offset = next_static_word_offset;
4421 next_static_word_offset += BytesPerInt;
4422 break;
4423 case STATIC_DOUBLE:
4424 real_offset = next_static_double_offset;
4425 next_static_double_offset += BytesPerLong;
4426 break;
4427 case NONSTATIC_FLATTENABLE:
4428 if (fs.is_flattened()) {
4429 Klass* klass = nonstatic_value_type_klasses[next_value_type_index];
4430 assert(klass != NULL, "Klass should have been loaded and resolved earlier");
4431 assert(klass->access_flags().is_value_type(),"Must be a value type");
4432 ValueKlass* vklass = ValueKlass::cast(klass);
4433 real_offset = next_nonstatic_valuetype_offset;
4434 next_nonstatic_valuetype_offset += (vklass->size_helper()) * wordSize - vklass->first_field_offset();
4435 // aligning next value type on a 64 bits boundary
4436 next_nonstatic_valuetype_offset = align_up(next_nonstatic_valuetype_offset, BytesPerLong);
4437 next_value_type_index += 1;
4438
4439 if (vklass->contains_oops()) { // add flatten oop maps
4440 int diff = real_offset - vklass->first_field_offset();
4441 const OopMapBlock* map = vklass->start_of_nonstatic_oop_maps();
4442 const OopMapBlock* const last_map = map + vklass->nonstatic_oop_map_count();
4443 while (map < last_map) {
4444 nonstatic_oop_maps->add(map->offset() + diff, map->count());
4445 map++;
4446 }
4447 }
4448 break;
4449 } else {
4450 // Fall through
4451 }
4452 case NONSTATIC_OOP:
4453 if( nonstatic_oop_space_count > 0 ) {
4454 real_offset = nonstatic_oop_space_offset;
4455 nonstatic_oop_space_offset += heapOopSize;
4456 nonstatic_oop_space_count -= 1;
4457 } else {
4458 real_offset = next_nonstatic_oop_offset;
4459 next_nonstatic_oop_offset += heapOopSize;
4460 }
4461 nonstatic_oop_maps->add(real_offset, 1);
4462 break;
4463 case NONSTATIC_BYTE:
4464 if( nonstatic_byte_space_count > 0 ) {
4465 real_offset = nonstatic_byte_space_offset;
4466 nonstatic_byte_space_offset += 1;
4467 nonstatic_byte_space_count -= 1;
4468 } else {
4469 real_offset = next_nonstatic_byte_offset;
4470 next_nonstatic_byte_offset += 1;
4471 }
4472 break;
4473 case NONSTATIC_SHORT:
4474 if( nonstatic_short_space_count > 0 ) {
4475 real_offset = nonstatic_short_space_offset;
4476 nonstatic_short_space_offset += BytesPerShort;
4477 nonstatic_short_space_count -= 1;
4478 } else {
4479 real_offset = next_nonstatic_short_offset;
4480 next_nonstatic_short_offset += BytesPerShort;
4481 }
4482 break;
4483 case NONSTATIC_WORD:
4484 if( nonstatic_word_space_count > 0 ) {
4485 real_offset = nonstatic_word_space_offset;
4486 nonstatic_word_space_offset += BytesPerInt;
4487 nonstatic_word_space_count -= 1;
4488 } else {
4489 real_offset = next_nonstatic_word_offset;
4490 next_nonstatic_word_offset += BytesPerInt;
4491 }
4492 break;
4493 case NONSTATIC_DOUBLE:
4494 real_offset = next_nonstatic_double_offset;
4495 next_nonstatic_double_offset += BytesPerLong;
4496 break;
4497 default:
4498 ShouldNotReachHere();
4499 }
4500 fs.set_offset(real_offset);
4501 }
4502
4503
4504 // Handle the contended cases.
4505 //
4506 // Each contended field should not intersect the cache line with another contended field.
4507 // In the absence of alignment information, we end up with pessimistically separating
4508 // the fields with full-width padding.
4509 //
4510 // Additionally, this should not break alignment for the fields, so we round the alignment up
4511 // for each field.
4512 if (nonstatic_contended_count > 0) {
4513
4514 // if there is at least one contended field, we need to have pre-padding for them
4515 next_nonstatic_padded_offset += ContendedPaddingWidth;
4516
4517 // collect all contended groups
4518 ResourceBitMap bm(cp->size());
4519 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4520 // skip already laid out fields
4521 if (fs.is_offset_set()) continue;
4522
4523 if (fs.is_contended()) {
4524 bm.set_bit(fs.contended_group());
4525 }
4526 }
4527
4528 int current_group = -1;
4529 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4530
4531 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4532
4533 // skip already laid out fields
4534 if (fs.is_offset_set()) continue;
4535
4536 // skip non-contended fields and fields from different group
4537 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4538
4539 // handle statics below
4540 if (fs.access_flags().is_static()) continue;
4541
4542 int real_offset = 0;
4543 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4544
4545 switch (atype) {
4546 case NONSTATIC_BYTE:
4547 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4548 real_offset = next_nonstatic_padded_offset;
4549 next_nonstatic_padded_offset += 1;
4550 break;
4551
4552 case NONSTATIC_SHORT:
4553 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4554 real_offset = next_nonstatic_padded_offset;
4555 next_nonstatic_padded_offset += BytesPerShort;
4556 break;
4557
4558 case NONSTATIC_WORD:
4559 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4560 real_offset = next_nonstatic_padded_offset;
4561 next_nonstatic_padded_offset += BytesPerInt;
4562 break;
4563
4564 case NONSTATIC_DOUBLE:
4565 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4566 real_offset = next_nonstatic_padded_offset;
4567 next_nonstatic_padded_offset += BytesPerLong;
4568 break;
4569
4570 // Value types in static fields are handled with oops
4571 case NONSTATIC_FLATTENABLE:
4572 throwValueTypeLimitation(THREAD_AND_LOCATION,
4573 "@Contended annotation not supported for value types yet", fs.name(), fs.signature());
4574 return;
4575
4576 case NONSTATIC_OOP:
4577 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4578 real_offset = next_nonstatic_padded_offset;
4579 next_nonstatic_padded_offset += heapOopSize;
4580 nonstatic_oop_maps->add(real_offset, 1);
4581 break;
4582
4583 default:
4584 ShouldNotReachHere();
4585 }
4586
4587 if (fs.contended_group() == 0) {
4588 // Contended group defines the equivalence class over the fields:
4589 // the fields within the same contended group are not inter-padded.
4590 // The only exception is default group, which does not incur the
4591 // equivalence, and so requires intra-padding.
4592 next_nonstatic_padded_offset += ContendedPaddingWidth;
4593 }
4594
4595 fs.set_offset(real_offset);
4596 } // for
4597
4598 // Start laying out the next group.
4599 // Note that this will effectively pad the last group in the back;
4600 // this is expected to alleviate memory contention effects for
4601 // subclass fields and/or adjacent object.
4602 // If this was the default group, the padding is already in place.
4603 if (current_group != 0) {
4604 next_nonstatic_padded_offset += ContendedPaddingWidth;
4605 }
4606 }
4607
4608 // handle static fields
4609 }
4610
4611 // Entire class is contended, pad in the back.
4612 // This helps to alleviate memory contention effects for subclass fields
4613 // and/or adjacent object.
4614 if (is_contended_class) {
4615 assert(!is_value_type(), "@Contended not supported for value types yet");
4616 next_nonstatic_padded_offset += ContendedPaddingWidth;
4617 }
4618
4619 int notaligned_nonstatic_fields_end;
4620 if (nonstatic_value_type_count != 0) {
4621 notaligned_nonstatic_fields_end = next_nonstatic_valuetype_offset;
4622 } else {
4623 notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4624 }
4625
4626 int nonstatic_field_sz_align = heapOopSize;
4627 if (is_value_type()) {
4628 if ((notaligned_nonstatic_fields_end - nonstatic_fields_start) > heapOopSize) {
4629 nonstatic_field_sz_align = BytesPerLong; // value copy of fields only uses jlong copy
4630 }
4631 }
4632 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, nonstatic_field_sz_align);
4633 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4634 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4635
4636 int static_field_size = (static_fields_end -
4637 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4638 nonstatic_field_size = nonstatic_field_size +
4639 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4640
4641 int instance_size = align_object_size(instance_end / wordSize);
4642
4643 assert(instance_size == align_object_size(align_up(
4644 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize)
4645 + initial_value_type_padding, wordSize) / wordSize), "consistent layout helper value");
4646
4647
4648 // Invariant: nonstatic_field end/start should only change if there are
4649 // nonstatic fields in the class, or if the class is contended. We compare
4650 // against the non-aligned value, so that end alignment will not fail the
4651 // assert without actually having the fields.
4652 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4653 is_contended_class ||
4654 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4655
4656 // Number of non-static oop map blocks allocated at end of klass.
4657 nonstatic_oop_maps->compact(THREAD);
4658
4659 #ifndef PRODUCT
4660 if ((PrintFieldLayout && !is_value_type()) ||
4661 (PrintValueLayout && (is_value_type() || has_nonstatic_value_fields))) {
4662 print_field_layout(_class_name,
4663 _fields,
4664 cp,
4665 instance_size,
4666 nonstatic_fields_start,
4667 nonstatic_fields_end,
4668 static_fields_end);
4669 nonstatic_oop_maps->print_on(tty);
4670 tty->print("\n");
4671 }
4672
4673 #endif
4674 // Pass back information needed for InstanceKlass creation
4675 info->oop_map_blocks = nonstatic_oop_maps;
4676 info->instance_size = instance_size;
4677 info->static_field_size = static_field_size;
4678 info->nonstatic_field_size = nonstatic_field_size;
4679 info->has_nonstatic_fields = has_nonstatic_fields;
4680 }
4681
4682 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik, TRAPS) {
4683 assert(ik != NULL, "invariant");
4684
4685 const Klass* const super = ik->super();
4686
4687 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4688 // in which case we don't have to register objects as finalizable
4689 if (!_has_empty_finalizer) {
4690 if (_has_finalizer ||
4691 (super != NULL && super->has_finalizer())) {
4692 ik->set_has_finalizer();
4693 }
4694 }
4695
4696 #ifdef ASSERT
4697 bool f = false;
4698 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4699 vmSymbols::void_method_signature());
4700 if (m != NULL && !m->is_empty_method()) {
4701 f = true;
4702 }
4703
4704 // Spec doesn't prevent agent from redefinition of empty finalizer.
4705 // Despite the fact that it's generally bad idea and redefined finalizer
4706 // will not work as expected we shouldn't abort vm in this case
4707 if (!ik->has_redefined_this_or_super()) {
4708 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4709 }
4710 #endif
4711
4712 // Check if this klass supports the java.lang.Cloneable interface
4713 if (SystemDictionary::Cloneable_klass_loaded()) {
4714 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4715 if (ik->is_value()) {
4716 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support Cloneable");
4717 return;
4718 }
4719 ik->set_is_cloneable();
4720 }
4721 }
4722
4723 // Check if this klass has a vanilla default constructor
4724 if (super == NULL) {
4725 // java.lang.Object has empty default constructor
4726 ik->set_has_vanilla_constructor();
4727 } else {
4728 if (super->has_vanilla_constructor() &&
4729 _has_vanilla_constructor) {
4730 ik->set_has_vanilla_constructor();
4731 }
4732 #ifdef ASSERT
4733 bool v = false;
4734 if (super->has_vanilla_constructor()) {
4735 const Method* const constructor =
4736 ik->find_method(vmSymbols::object_initializer_name(),
4737 vmSymbols::void_method_signature());
4738 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4739 v = true;
4740 }
4741 }
4742 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4743 #endif
4744 }
4745
4746 // If it cannot be fast-path allocated, set a bit in the layout helper.
4747 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4748 assert(ik->size_helper() > 0, "layout_helper is initialized");
4749 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4750 || ik->is_abstract() || ik->is_interface()
4751 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4752 || ik->size_helper() >= FastAllocateSizeLimit) {
4753 // Forbid fast-path allocation.
4754 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4755 ik->set_layout_helper(lh);
4756 }
4757 }
4758
4759 bool ClassFileParser::supports_value_types() const {
4760 // Value types are only supported by class file version 55 and later
4761 return _major_version >= JAVA_11_VERSION;
4762 }
4763
4764 // utility methods for appending an array with check for duplicates
4765
4766 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4767 const Array<InstanceKlass*>* const ifs) {
4768 // iterate over new interfaces
4769 for (int i = 0; i < ifs->length(); i++) {
4770 InstanceKlass* const e = ifs->at(i);
4771 assert(e->is_klass() && e->is_interface(), "just checking");
4772 // add new interface
4773 result->append_if_missing(e);
4774 }
4775 }
4776
4777 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4778 Array<InstanceKlass*>* local_ifs,
4779 ClassLoaderData* loader_data,
4780 TRAPS) {
4781 assert(local_ifs != NULL, "invariant");
4782 assert(loader_data != NULL, "invariant");
4783
4784 // Compute maximum size for transitive interfaces
4785 int max_transitive_size = 0;
4786 int super_size = 0;
4787 // Add superclass transitive interfaces size
4788 if (super != NULL) {
4789 super_size = super->transitive_interfaces()->length();
4790 max_transitive_size += super_size;
4791 }
4792 // Add local interfaces' super interfaces
4793 const int local_size = local_ifs->length();
4794 for (int i = 0; i < local_size; i++) {
4795 InstanceKlass* const l = local_ifs->at(i);
4796 max_transitive_size += l->transitive_interfaces()->length();
4797 }
4798 // Finally add local interfaces
4799 max_transitive_size += local_size;
4800 // Construct array
4801 if (max_transitive_size == 0) {
4802 // no interfaces, use canonicalized array
4803 return Universe::the_empty_instance_klass_array();
4804 } else if (max_transitive_size == super_size) {
4805 // no new local interfaces added, share superklass' transitive interface array
4806 return super->transitive_interfaces();
4807 } else if (max_transitive_size == local_size) {
4808 // only local interfaces added, share local interface array
4809 return local_ifs;
4810 } else {
4811 ResourceMark rm;
4812 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4813
4814 // Copy down from superclass
4815 if (super != NULL) {
4816 append_interfaces(result, super->transitive_interfaces());
4817 }
4818
4819 // Copy down from local interfaces' superinterfaces
4820 for (int i = 0; i < local_size; i++) {
4821 InstanceKlass* const l = local_ifs->at(i);
4822 append_interfaces(result, l->transitive_interfaces());
4823 }
4824 // Finally add local interfaces
4825 append_interfaces(result, local_ifs);
4826
4827 // length will be less than the max_transitive_size if duplicates were removed
4828 const int length = result->length();
4829 assert(length <= max_transitive_size, "just checking");
4830 Array<InstanceKlass*>* const new_result =
4831 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4832 for (int i = 0; i < length; i++) {
4833 InstanceKlass* const e = result->at(i);
4834 assert(e != NULL, "just checking");
4835 new_result->at_put(i, e);
4836 }
4837 return new_result;
4838 }
4839 }
4840
4841 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4842 assert(this_klass != NULL, "invariant");
4843 const Klass* const super = this_klass->super();
4844 if (super != NULL) {
4845
4846 // If the loader is not the boot loader then throw an exception if its
4847 // superclass is in package jdk.internal.reflect and its loader is not a
4848 // special reflection class loader
4849 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4850 assert(super->is_instance_klass(), "super is not instance klass");
4851 PackageEntry* super_package = super->package();
4852 if (super_package != NULL &&
4853 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4854 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4855 ResourceMark rm(THREAD);
4856 Exceptions::fthrow(
4857 THREAD_AND_LOCATION,
4858 vmSymbols::java_lang_IllegalAccessError(),
4859 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4860 this_klass->external_name(),
4861 this_klass->class_loader_data()->loader_name_and_id(),
4862 super->external_name());
4863 return;
4864 }
4865 }
4866
4867 Reflection::VerifyClassAccessResults vca_result =
4868 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4869 if (vca_result != Reflection::ACCESS_OK) {
4870 ResourceMark rm(THREAD);
4871 char* msg = Reflection::verify_class_access_msg(this_klass,
4872 InstanceKlass::cast(super),
4873 vca_result);
4874 if (msg == NULL) {
4875 bool same_module = (this_klass->module() == super->module());
4876 Exceptions::fthrow(
4877 THREAD_AND_LOCATION,
4878 vmSymbols::java_lang_IllegalAccessError(),
4879 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4880 this_klass->external_name(),
4881 super->is_abstract() ? "abstract " : "",
4882 super->external_name(),
4883 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4884 (same_module) ? "" : "; ",
4885 (same_module) ? "" : super->class_in_module_of_loader());
4886 } else {
4887 // Add additional message content.
4888 Exceptions::fthrow(
4889 THREAD_AND_LOCATION,
4890 vmSymbols::java_lang_IllegalAccessError(),
4891 "superclass access check failed: %s",
4892 msg);
4893 }
4894 }
4895 }
4896 }
4897
4898
4899 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4900 assert(this_klass != NULL, "invariant");
4901 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4902 const int lng = local_interfaces->length();
4903 for (int i = lng - 1; i >= 0; i--) {
4904 InstanceKlass* const k = local_interfaces->at(i);
4905 assert (k != NULL && k->is_interface(), "invalid interface");
4906 Reflection::VerifyClassAccessResults vca_result =
4907 Reflection::verify_class_access(this_klass, k, false);
4908 if (vca_result != Reflection::ACCESS_OK) {
4909 ResourceMark rm(THREAD);
4910 char* msg = Reflection::verify_class_access_msg(this_klass,
4911 k,
4912 vca_result);
4913 if (msg == NULL) {
4914 bool same_module = (this_klass->module() == k->module());
4915 Exceptions::fthrow(
4916 THREAD_AND_LOCATION,
4917 vmSymbols::java_lang_IllegalAccessError(),
4918 "class %s cannot access its superinterface %s (%s%s%s)",
4919 this_klass->external_name(),
4920 k->external_name(),
4921 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4922 (same_module) ? "" : "; ",
4923 (same_module) ? "" : k->class_in_module_of_loader());
4924 } else {
4925 // Add additional message content.
4926 Exceptions::fthrow(
4927 THREAD_AND_LOCATION,
4928 vmSymbols::java_lang_IllegalAccessError(),
4929 "superinterface check failed: %s",
4930 msg);
4931 }
4932 }
4933 }
4934 }
4935
4936
4937 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4938 assert(this_klass != NULL, "invariant");
4939 const Array<Method*>* const methods = this_klass->methods();
4940 const int num_methods = methods->length();
4941
4942 // go thru each method and check if it overrides a final method
4943 for (int index = 0; index < num_methods; index++) {
4944 const Method* const m = methods->at(index);
4945
4946 // skip private, static, and <init> methods
4947 if ((!m->is_private() && !m->is_static()) &&
4948 (m->name() != vmSymbols::object_initializer_name())) {
4949
4950 const Symbol* const name = m->name();
4951 const Symbol* const signature = m->signature();
4952 const Klass* k = this_klass->super();
4953 const Method* super_m = NULL;
4954 while (k != NULL) {
4955 // skip supers that don't have final methods.
4956 if (k->has_final_method()) {
4957 // lookup a matching method in the super class hierarchy
4958 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4959 if (super_m == NULL) {
4960 break; // didn't find any match; get out
4961 }
4962
4963 if (super_m->is_final() && !super_m->is_static() &&
4964 !super_m->access_flags().is_private()) {
4965 // matching method in super is final, and not static or private
4966 bool can_access = Reflection::verify_member_access(this_klass,
4967 super_m->method_holder(),
4968 super_m->method_holder(),
4969 super_m->access_flags(),
4970 false, false, CHECK);
4971 if (can_access) {
4972 // this class can access super final method and therefore override
4973 ResourceMark rm(THREAD);
4974 Exceptions::fthrow(THREAD_AND_LOCATION,
4975 vmSymbols::java_lang_VerifyError(),
4976 "class %s overrides final method %s.%s%s",
4977 this_klass->external_name(),
4978 super_m->method_holder()->external_name(),
4979 name->as_C_string(),
4980 signature->as_C_string()
4981 );
4982 return;
4983 }
4984 }
4985
4986 // continue to look from super_m's holder's super.
4987 k = super_m->method_holder()->super();
4988 continue;
4989 }
4990
4991 k = k->super();
4992 }
4993 }
4994 }
4995 }
4996
4997
4998 // assumes that this_klass is an interface
4999 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
5000 assert(this_klass != NULL, "invariant");
5001 assert(this_klass->is_interface(), "not an interface");
5002 const Array<Method*>* methods = this_klass->methods();
5003 const int num_methods = methods->length();
5004
5005 for (int index = 0; index < num_methods; index++) {
5006 const Method* const m = methods->at(index);
5007 // if m is static and not the init method, throw a verify error
5008 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
5009 ResourceMark rm(THREAD);
5010 Exceptions::fthrow(
5011 THREAD_AND_LOCATION,
5012 vmSymbols::java_lang_VerifyError(),
5013 "Illegal static method %s in interface %s",
5014 m->name()->as_C_string(),
5015 this_klass->external_name()
5016 );
5017 return;
5018 }
5019 }
5020 }
5021
5022 // utility methods for format checking
5023
5024 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
5025 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5026 const bool is_value_type = (flags & JVM_ACC_VALUE) != 0;
5027 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
5028 assert(supports_value_types() || !is_value_type, "JVM_ACC_VALUE should not be set");
5029 if (is_module) {
5030 ResourceMark rm(THREAD);
5031 Exceptions::fthrow(
5032 THREAD_AND_LOCATION,
5033 vmSymbols::java_lang_NoClassDefFoundError(),
5034 "%s is not a class because access_flag ACC_MODULE is set",
5035 _class_name->as_C_string());
5036 return;
5037 }
5038
5039 if (is_value_type && !EnableValhalla) {
5040 ResourceMark rm(THREAD);
5041 Exceptions::fthrow(
5042 THREAD_AND_LOCATION,
5043 vmSymbols::java_lang_ClassFormatError(),
5044 "Class modifier ACC_VALUE in class %s requires option -XX:+EnableValhalla",
5045 _class_name->as_C_string()
5046 );
5047 }
5048
5049 if (!_need_verify) { return; }
5050
5051 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5052 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5053 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5054 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
5055 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5056 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
5057 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5058
5059 if ((is_abstract && is_final) ||
5060 (is_interface && !is_abstract) ||
5061 (is_interface && major_gte_15 && (is_super || is_enum)) ||
5062 (!is_interface && major_gte_15 && is_annotation) ||
5063 (is_value_type && (is_interface || is_abstract || is_enum || !is_final))) {
5064 ResourceMark rm(THREAD);
5065 const char* class_note = "";
5066 if (is_value_type) class_note = " (an inline class)";
5067 Exceptions::fthrow(
5068 THREAD_AND_LOCATION,
5069 vmSymbols::java_lang_ClassFormatError(),
5070 "Illegal class modifiers in class %s%s: 0x%X",
5071 _class_name->as_C_string(), class_note, flags
5072 );
5073 return;
5074 }
5075 }
5076
5077 static bool has_illegal_visibility(jint flags) {
5078 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5079 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5080 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5081
5082 return ((is_public && is_protected) ||
5083 (is_public && is_private) ||
5084 (is_protected && is_private));
5085 }
5086
5087 // A legal major_version.minor_version must be one of the following:
5088 //
5089 // Major_version >= 45 and major_version < 56, any minor_version.
5090 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
5091 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
5092 //
5093 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
5094 ResourceMark rm(THREAD);
5095 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
5096 if (major < JAVA_MIN_SUPPORTED_VERSION) {
5097 Exceptions::fthrow(
5098 THREAD_AND_LOCATION,
5099 vmSymbols::java_lang_UnsupportedClassVersionError(),
5100 "%s (class file version %u.%u) was compiled with an invalid major version",
5101 class_name->as_C_string(), major, minor);
5102 return;
5103 }
5104
5105 if (major > max_version) {
5106 Exceptions::fthrow(
5107 THREAD_AND_LOCATION,
5108 vmSymbols::java_lang_UnsupportedClassVersionError(),
5109 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5110 "this version of the Java Runtime only recognizes class file versions up to %u.0",
5111 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
5112 return;
5113 }
5114
5115 if (major < JAVA_12_VERSION || minor == 0) {
5116 return;
5117 }
5118
5119 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
5120 if (major != max_version) {
5121 Exceptions::fthrow(
5122 THREAD_AND_LOCATION,
5123 vmSymbols::java_lang_UnsupportedClassVersionError(),
5124 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
5125 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
5126 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
5127 return;
5128 }
5129
5130 if (!Arguments::enable_preview()) {
5131 Exceptions::fthrow(
5132 THREAD_AND_LOCATION,
5133 vmSymbols::java_lang_UnsupportedClassVersionError(),
5134 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
5135 class_name->as_C_string(), major, minor);
5136 return;
5137 }
5138
5139 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
5140 Exceptions::fthrow(
5141 THREAD_AND_LOCATION,
5142 vmSymbols::java_lang_UnsupportedClassVersionError(),
5143 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
5144 class_name->as_C_string(), major, minor);
5145 }
5146 }
5147
5148 void ClassFileParser::verify_legal_field_modifiers(jint flags,
5149 bool is_interface,
5150 bool is_value_type,
5151 TRAPS) const {
5152 if (!_need_verify) { return; }
5153
5154 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5155 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5156 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5157 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5158 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5159 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
5160 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
5161 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5162 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5163
5164 bool is_illegal = false;
5165
5166 if (is_interface) {
5167 if (!is_public || !is_static || !is_final || is_private ||
5168 is_protected || is_volatile || is_transient ||
5169 (major_gte_15 && is_enum)) {
5170 is_illegal = true;
5171 }
5172 } else { // not interface
5173 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
5174 is_illegal = true;
5175 } else {
5176 if (is_value_type && !is_static && !is_final) {
5177 is_illegal = true;
5178 }
5179 }
5180 }
5181
5182 if (is_illegal) {
5183 ResourceMark rm(THREAD);
5184 Exceptions::fthrow(
5185 THREAD_AND_LOCATION,
5186 vmSymbols::java_lang_ClassFormatError(),
5187 "Illegal field modifiers in class %s: 0x%X",
5188 _class_name->as_C_string(), flags);
5189 return;
5190 }
5191 }
5192
5193 void ClassFileParser::verify_legal_method_modifiers(jint flags,
5194 bool is_interface,
5195 bool is_value_type,
5196 const Symbol* name,
5197 TRAPS) const {
5198 if (!_need_verify) { return; }
5199
5200 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5201 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5202 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5203 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5204 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
5205 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5206 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
5207 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
5208 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
5209 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5210 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5211 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
5212 const bool is_initializer = (name == vmSymbols::object_initializer_name());
5213
5214 bool is_illegal = false;
5215
5216 const char* class_note = "";
5217
5218 if (is_interface) {
5219 if (major_gte_8) {
5220 // Class file version is JAVA_8_VERSION or later Methods of
5221 // interfaces may set any of the flags except ACC_PROTECTED,
5222 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5223 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5224 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5225 (is_native || is_protected || is_final || is_synchronized) ||
5226 // If a specific method of a class or interface has its
5227 // ACC_ABSTRACT flag set, it must not have any of its
5228 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5229 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
5230 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5231 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5232 (is_abstract && (is_private || is_static || is_strict))) {
5233 is_illegal = true;
5234 }
5235 } else if (major_gte_15) {
5236 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5237 if (!is_public || is_private || is_protected || is_static || is_final ||
5238 is_synchronized || is_native || !is_abstract || is_strict) {
5239 is_illegal = true;
5240 }
5241 } else {
5242 // Class file version is pre-JAVA_1_5_VERSION
5243 if (!is_public || is_static || is_final || is_native || !is_abstract) {
5244 is_illegal = true;
5245 }
5246 }
5247 } else { // not interface
5248 if (has_illegal_visibility(flags)) {
5249 is_illegal = true;
5250 } else {
5251 if (is_initializer) {
5252 if (is_final || is_synchronized || is_native ||
5253 is_abstract || (major_gte_15 && is_bridge)) {
5254 is_illegal = true;
5255 }
5256 if (!is_static && !is_value_type) {
5257 // OK, an object constructor in a regular class
5258 } else if (is_static && is_value_type) {
5259 // OK, a static init factory in an inline class
5260 } else {
5261 // but no other combinations are allowed
5262 is_illegal = true;
5263 class_note = (is_value_type ? " (an inline class)" : " (not an inline class)");
5264 }
5265 } else { // not initializer
5266 if (is_value_type && is_synchronized && !is_static) {
5267 is_illegal = true;
5268 class_note = " (an inline class)";
5269 } else {
5270 if (is_abstract) {
5271 if ((is_final || is_native || is_private || is_static ||
5272 (major_gte_15 && (is_synchronized || is_strict)))) {
5273 is_illegal = true;
5274 }
5275 }
5276 }
5277 }
5278 }
5279 }
5280
5281 if (is_illegal) {
5282 ResourceMark rm(THREAD);
5283 Exceptions::fthrow(
5284 THREAD_AND_LOCATION,
5285 vmSymbols::java_lang_ClassFormatError(),
5286 "Method %s in class %s%s has illegal modifiers: 0x%X",
5287 name->as_C_string(), _class_name->as_C_string(), class_note, flags);
5288 return;
5289 }
5290 }
5291
5292 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5293 int length,
5294 TRAPS) const {
5295 assert(_need_verify, "only called when _need_verify is true");
5296 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5297 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5298 }
5299 }
5300
5301 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5302 // In class names, '/' separates unqualified names. This is verified in this function also.
5303 // Method names also may not contain the characters '<' or '>', unless <init>
5304 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5305 // method. Because these names have been checked as special cases before
5306 // calling this method in verify_legal_method_name.
5307 //
5308 // This method is also called from the modular system APIs in modules.cpp
5309 // to verify the validity of module and package names.
5310 bool ClassFileParser::verify_unqualified_name(const char* name,
5311 unsigned int length,
5312 int type) {
5313 if (length == 0) return false; // Must have at least one char.
5314 for (const char* p = name; p != name + length; p++) {
5315 switch(*p) {
5316 case '.':
5317 case ';':
5318 case '[':
5319 // do not permit '.', ';', or '['
5320 return false;
5321 case '/':
5322 // check for '//' or leading or trailing '/' which are not legal
5323 // unqualified name must not be empty
5324 if (type == ClassFileParser::LegalClass) {
5325 if (p == name || p+1 >= name+length || *(p+1) == '/') {
5326 return false;
5327 }
5328 } else {
5329 return false; // do not permit '/' unless it's class name
5330 }
5331 break;
5332 case '<':
5333 case '>':
5334 // do not permit '<' or '>' in method names
5335 if (type == ClassFileParser::LegalMethod) {
5336 return false;
5337 }
5338 }
5339 }
5340 return true;
5341 }
5342
5343 // Take pointer to a UTF8 byte string (not NUL-terminated).
5344 // Skip over the longest part of the string that could
5345 // be taken as a fieldname. Allow '/' if slash_ok is true.
5346 // Return a pointer to just past the fieldname.
5347 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5348 // being true, we saw consecutive slashes (meaning we were looking for a
5349 // qualified path but found something that was badly-formed).
5350 static const char* skip_over_field_name(const char* const name,
5351 bool slash_ok,
5352 unsigned int length) {
5353 const char* p;
5354 jboolean last_is_slash = false;
5355 jboolean not_first_ch = false;
5356
5357 for (p = name; p != name + length; not_first_ch = true) {
5358 const char* old_p = p;
5359 jchar ch = *p;
5360 if (ch < 128) {
5361 p++;
5362 // quick check for ascii
5363 if ((ch >= 'a' && ch <= 'z') ||
5364 (ch >= 'A' && ch <= 'Z') ||
5365 (ch == '_' || ch == '$') ||
5366 (not_first_ch && ch >= '0' && ch <= '9')) {
5367 last_is_slash = false;
5368 continue;
5369 }
5370 if (slash_ok && ch == '/') {
5371 if (last_is_slash) {
5372 return NULL; // Don't permit consecutive slashes
5373 }
5374 last_is_slash = true;
5375 continue;
5376 }
5377 }
5378 else {
5379 jint unicode_ch;
5380 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5381 p = tmp_p;
5382 last_is_slash = false;
5383 // Check if ch is Java identifier start or is Java identifier part
5384 // 4672820: call java.lang.Character methods directly without generating separate tables.
5385 EXCEPTION_MARK;
5386 // return value
5387 JavaValue result(T_BOOLEAN);
5388 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
5389 JavaCallArguments args;
5390 args.push_int(unicode_ch);
5391
5392 if (not_first_ch) {
5393 // public static boolean isJavaIdentifierPart(char ch);
5394 JavaCalls::call_static(&result,
5395 SystemDictionary::Character_klass(),
5396 vmSymbols::isJavaIdentifierPart_name(),
5397 vmSymbols::int_bool_signature(),
5398 &args,
5399 THREAD);
5400 } else {
5401 // public static boolean isJavaIdentifierStart(char ch);
5402 JavaCalls::call_static(&result,
5403 SystemDictionary::Character_klass(),
5404 vmSymbols::isJavaIdentifierStart_name(),
5405 vmSymbols::int_bool_signature(),
5406 &args,
5407 THREAD);
5408 }
5409 if (HAS_PENDING_EXCEPTION) {
5410 CLEAR_PENDING_EXCEPTION;
5411 return NULL;
5412 }
5413 if(result.get_jboolean()) {
5414 continue;
5415 }
5416 }
5417 return (not_first_ch) ? old_p : NULL;
5418 }
5419 return (not_first_ch) ? p : NULL;
5420 }
5421
5422 // Take pointer to a UTF8 byte string (not NUL-terminated).
5423 // Skip over the longest part of the string that could
5424 // be taken as a field signature. Allow "void" if void_ok.
5425 // Return a pointer to just past the signature.
5426 // Return NULL if no legal signature is found.
5427 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5428 bool void_ok,
5429 unsigned int length,
5430 TRAPS) const {
5431 unsigned int array_dim = 0;
5432 while (length > 0) {
5433 switch (signature[0]) {
5434 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5435 case JVM_SIGNATURE_BOOLEAN:
5436 case JVM_SIGNATURE_BYTE:
5437 case JVM_SIGNATURE_CHAR:
5438 case JVM_SIGNATURE_SHORT:
5439 case JVM_SIGNATURE_INT:
5440 case JVM_SIGNATURE_FLOAT:
5441 case JVM_SIGNATURE_LONG:
5442 case JVM_SIGNATURE_DOUBLE:
5443 return signature + 1;
5444 case JVM_SIGNATURE_VALUETYPE:
5445 // Can't enable this check until JDK upgrades the bytecode generators
5446 // if (_major_version < CONSTANT_CLASS_DESCRIPTORS ) {
5447 // classfile_parse_error("Class name contains illegal Q-signature "
5448 // "in descriptor in class file %s",
5449 // CHECK_0);
5450 // }
5451 // fall through
5452 case JVM_SIGNATURE_CLASS:
5453 {
5454 if (_major_version < JAVA_1_5_VERSION) {
5455 // Skip over the class name if one is there
5456 const char* const p = skip_over_field_name(signature + 1, true, --length);
5457
5458 // The next character better be a semicolon
5459 if (p && (p - signature) > 1 && p[0] == ';') {
5460 return p + 1;
5461 }
5462 }
5463 else {
5464 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
5465 signature++;
5466 const char* c = (const char*) memchr(signature, ';', length - 1);
5467 // Format check signature
5468 if (c != NULL) {
5469 int newlen = c - (char*) signature;
5470 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5471 if (!legal) {
5472 classfile_parse_error("Class name is empty or contains illegal character "
5473 "in descriptor in class file %s",
5474 CHECK_0);
5475 return NULL;
5476 }
5477 return signature + newlen + 1;
5478 }
5479 }
5480 return NULL;
5481 }
5482 case JVM_SIGNATURE_ARRAY:
5483 array_dim++;
5484 if (array_dim > 255) {
5485 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5486 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5487 }
5488 // The rest of what's there better be a legal signature
5489 signature++;
5490 length--;
5491 void_ok = false;
5492 break;
5493 default:
5494 return NULL;
5495 }
5496 }
5497 return NULL;
5498 }
5499
5500 // Checks if name is a legal class name.
5501 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5502 if (!_need_verify || _relax_verify) { return; }
5503
5504 assert(name->refcount() > 0, "symbol must be kept alive");
5505 char* bytes = (char*)name->bytes();
5506 unsigned int length = name->utf8_length();
5507 bool legal = false;
5508
5509 if (length > 0) {
5510 const char* p;
5511 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5512 p = skip_over_field_signature(bytes, false, length, CHECK);
5513 legal = (p != NULL) && ((p - bytes) == (int)length);
5514 } else if (_major_version < JAVA_1_5_VERSION) {
5515 if (bytes[0] != '<') {
5516 p = skip_over_field_name(bytes, true, length);
5517 legal = (p != NULL) && ((p - bytes) == (int)length);
5518 }
5519 } else if (_major_version >= CONSTANT_CLASS_DESCRIPTORS && bytes[length - 1] == ';' ) {
5520 // Support for L...; and Q...; descriptors
5521 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
5522 } else {
5523 // 4900761: relax the constraints based on JSR202 spec
5524 // Class names may be drawn from the entire Unicode character set.
5525 // Identifiers between '/' must be unqualified names.
5526 // The utf8 string has been verified when parsing cpool entries.
5527 legal = verify_unqualified_name(bytes, length, LegalClass);
5528 }
5529 }
5530 if (!legal) {
5531 ResourceMark rm(THREAD);
5532 assert(_class_name != NULL, "invariant");
5533 Exceptions::fthrow(
5534 THREAD_AND_LOCATION,
5535 vmSymbols::java_lang_ClassFormatError(),
5536 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5537 _class_name->as_C_string()
5538 );
5539 return;
5540 }
5541 }
5542
5543 // Checks if name is a legal field name.
5544 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5545 if (!_need_verify || _relax_verify) { return; }
5546
5547 char* bytes = (char*)name->bytes();
5548 unsigned int length = name->utf8_length();
5549 bool legal = false;
5550
5551 if (length > 0) {
5552 if (_major_version < JAVA_1_5_VERSION) {
5553 if (bytes[0] != '<') {
5554 const char* p = skip_over_field_name(bytes, false, length);
5555 legal = (p != NULL) && ((p - bytes) == (int)length);
5556 }
5557 } else {
5558 // 4881221: relax the constraints based on JSR202 spec
5559 legal = verify_unqualified_name(bytes, length, LegalField);
5560 }
5561 }
5562
5563 if (!legal) {
5564 ResourceMark rm(THREAD);
5565 assert(_class_name != NULL, "invariant");
5566 Exceptions::fthrow(
5567 THREAD_AND_LOCATION,
5568 vmSymbols::java_lang_ClassFormatError(),
5569 "Illegal field name \"%.*s\" in class %s", length, bytes,
5570 _class_name->as_C_string()
5571 );
5572 return;
5573 }
5574 }
5575
5576 // Checks if name is a legal method name.
5577 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5578 if (!_need_verify || _relax_verify) { return; }
5579
5580 assert(name != NULL, "method name is null");
5581 char* bytes = (char*)name->bytes();
5582 unsigned int length = name->utf8_length();
5583 bool legal = false;
5584
5585 if (length > 0) {
5586 if (bytes[0] == '<') {
5587 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5588 legal = true;
5589 }
5590 } else if (_major_version < JAVA_1_5_VERSION) {
5591 const char* p;
5592 p = skip_over_field_name(bytes, false, length);
5593 legal = (p != NULL) && ((p - bytes) == (int)length);
5594 } else {
5595 // 4881221: relax the constraints based on JSR202 spec
5596 legal = verify_unqualified_name(bytes, length, LegalMethod);
5597 }
5598 }
5599
5600 if (!legal) {
5601 ResourceMark rm(THREAD);
5602 assert(_class_name != NULL, "invariant");
5603 Exceptions::fthrow(
5604 THREAD_AND_LOCATION,
5605 vmSymbols::java_lang_ClassFormatError(),
5606 "Illegal method name \"%.*s\" in class %s", length, bytes,
5607 _class_name->as_C_string()
5608 );
5609 return;
5610 }
5611 }
5612
5613
5614 // Checks if signature is a legal field signature.
5615 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5616 const Symbol* signature,
5617 TRAPS) const {
5618 if (!_need_verify) { return; }
5619
5620 const char* const bytes = (const char* const)signature->bytes();
5621 const unsigned int length = signature->utf8_length();
5622 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5623
5624 if (p == NULL || (p - bytes) != (int)length) {
5625 throwIllegalSignature("Field", name, signature, CHECK);
5626 }
5627 }
5628
5629 // Checks if signature is a legal method signature.
5630 // Returns number of parameters
5631 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5632 const Symbol* signature,
5633 TRAPS) const {
5634 if (!_need_verify) {
5635 // make sure caller's args_size will be less than 0 even for non-static
5636 // method so it will be recomputed in compute_size_of_parameters().
5637 return -2;
5638 }
5639
5640 // Class initializers cannot have args for class format version >= 51.
5641 if (name == vmSymbols::class_initializer_name() &&
5642 signature != vmSymbols::void_method_signature() &&
5643 _major_version >= JAVA_7_VERSION) {
5644 throwIllegalSignature("Method", name, signature, CHECK_0);
5645 return 0;
5646 }
5647
5648 unsigned int args_size = 0;
5649 const char* p = (const char*)signature->bytes();
5650 unsigned int length = signature->utf8_length();
5651 const char* nextp;
5652
5653 // The first character must be a '('
5654 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5655 length--;
5656 // Skip over legal field signatures
5657 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5658 while ((length > 0) && (nextp != NULL)) {
5659 args_size++;
5660 if (p[0] == 'J' || p[0] == 'D') {
5661 args_size++;
5662 }
5663 length -= nextp - p;
5664 p = nextp;
5665 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5666 }
5667 // The first non-signature thing better be a ')'
5668 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5669 length--;
5670 if (name->utf8_length() > 0 && name->char_at(0) == '<') {
5671 // All constructor methods must return void
5672 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5673 return args_size;
5674 }
5675 // All static init methods must return the current class
5676 if ((length >= 3) && (p[length-1] == JVM_SIGNATURE_ENDCLASS)
5677 && name == vmSymbols::object_initializer_name()) {
5678 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5679 if (nextp && ((int)length == (nextp - p))) {
5680 // The actual class will be checked against current class
5681 // when the method is defined (see parse_method).
5682 // A reference to a static init with a bad return type
5683 // will load and verify OK, but will fail to link.
5684 return args_size;
5685 }
5686 }
5687 // The distinction between static factory methods and
5688 // constructors depends on the JVM_ACC_STATIC modifier.
5689 // This distinction must be reflected in a void or non-void
5690 // return. For declared methods, the check is in parse_method.
5691 } else {
5692 // Now we better just have a return value
5693 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5694 if (nextp && ((int)length == (nextp - p))) {
5695 return args_size;
5696 }
5697 }
5698 }
5699 }
5700 // Report error
5701 throwIllegalSignature("Method", name, signature, CHECK_0);
5702 return 0;
5703 }
5704
5705 int ClassFileParser::static_field_size() const {
5706 assert(_field_info != NULL, "invariant");
5707 return _field_info->static_field_size;
5708 }
5709
5710 int ClassFileParser::total_oop_map_count() const {
5711 assert(_field_info != NULL, "invariant");
5712 return _field_info->oop_map_blocks->nonstatic_oop_map_count;
5713 }
5714
5715 jint ClassFileParser::layout_size() const {
5716 assert(_field_info != NULL, "invariant");
5717 return _field_info->instance_size;
5718 }
5719
5720 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5721 const Array<Method*>* methods) {
5722 assert(ik != NULL, "invariant");
5723 assert(methods != NULL, "invariant");
5724
5725 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5726 // (We used to do this lazily, but now we query it in Rewriter,
5727 // which is eagerly done for every method, so we might as well do it now,
5728 // when everything is fresh in memory.)
5729 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5730
5731 if (klass_id != vmSymbols::NO_SID) {
5732 for (int j = 0; j < methods->length(); ++j) {
5733 Method* method = methods->at(j);
5734 method->init_intrinsic_id();
5735
5736 if (CheckIntrinsics) {
5737 // Check if an intrinsic is defined for method 'method',
5738 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5739 if (method->intrinsic_id() != vmIntrinsics::_none &&
5740 !method->intrinsic_candidate()) {
5741 tty->print("Compiler intrinsic is defined for method [%s], "
5742 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5743 method->name_and_sig_as_C_string(),
5744 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5745 );
5746 tty->cr();
5747 DEBUG_ONLY(vm_exit(1));
5748 }
5749 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5750 // but there is no intrinsic available for it.
5751 if (method->intrinsic_candidate() &&
5752 method->intrinsic_id() == vmIntrinsics::_none) {
5753 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5754 "but no compiler intrinsic is defined for the method.%s",
5755 method->name_and_sig_as_C_string(),
5756 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5757 );
5758 tty->cr();
5759 DEBUG_ONLY(vm_exit(1));
5760 }
5761 }
5762 } // end for
5763
5764 #ifdef ASSERT
5765 if (CheckIntrinsics) {
5766 // Check for orphan methods in the current class. A method m
5767 // of a class C is orphan if an intrinsic is defined for method m,
5768 // but class C does not declare m.
5769 // The check is potentially expensive, therefore it is available
5770 // only in debug builds.
5771
5772 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5773 if (vmIntrinsics::_compiledLambdaForm == id) {
5774 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5775 // generated for the JVM from a LambdaForm and therefore no method
5776 // is defined for it.
5777 continue;
5778 }
5779
5780 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5781 // Check if the current class contains a method with the same
5782 // name, flags, signature.
5783 bool match = false;
5784 for (int j = 0; j < methods->length(); ++j) {
5785 const Method* method = methods->at(j);
5786 if (method->intrinsic_id() == id) {
5787 match = true;
5788 break;
5789 }
5790 }
5791
5792 if (!match) {
5793 char buf[1000];
5794 tty->print("Compiler intrinsic is defined for method [%s], "
5795 "but the method is not available in class [%s].%s",
5796 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5797 buf, sizeof(buf)),
5798 ik->name()->as_C_string(),
5799 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5800 );
5801 tty->cr();
5802 DEBUG_ONLY(vm_exit(1));
5803 }
5804 }
5805 } // end for
5806 } // CheckIntrinsics
5807 #endif // ASSERT
5808 }
5809 }
5810
5811 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5812 if (_klass != NULL) {
5813 return _klass;
5814 }
5815
5816 InstanceKlass* const ik =
5817 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5818
5819 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5820
5821 assert(_klass == ik, "invariant");
5822
5823
5824 if (ik->should_store_fingerprint()) {
5825 ik->store_fingerprint(_stream->compute_fingerprint());
5826 }
5827
5828 ik->set_has_passed_fingerprint_check(false);
5829 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5830 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5831 uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint();
5832 if (aot_fp != 0 && aot_fp == fp) {
5833 // This class matches with a class saved in an AOT library
5834 ik->set_has_passed_fingerprint_check(true);
5835 } else {
5836 ResourceMark rm;
5837 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5838 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5839 }
5840 }
5841
5842 if (ik->is_value()) {
5843 ValueKlass* vk = ValueKlass::cast(ik);
5844 oop val = ik->allocate_instance(CHECK_NULL);
5845 vk->set_default_value(val);
5846 }
5847
5848 return ik;
5849 }
5850
5851 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5852 assert(ik != NULL, "invariant");
5853
5854 // Set name and CLD before adding to CLD
5855 ik->set_class_loader_data(_loader_data);
5856 ik->set_name(_class_name);
5857
5858 // Add all classes to our internal class loader list here,
5859 // including classes in the bootstrap (NULL) class loader.
5860 const bool publicize = !is_internal();
5861
5862 _loader_data->add_class(ik, publicize);
5863
5864 set_klass_to_deallocate(ik);
5865
5866 assert(_field_info != NULL, "invariant");
5867 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5868 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->nonstatic_oop_map_count,
5869 "sanity");
5870
5871 assert(ik->is_instance_klass(), "sanity");
5872 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5873
5874 // Fill in information already parsed
5875 ik->set_should_verify_class(_need_verify);
5876
5877 // Not yet: supers are done below to support the new subtype-checking fields
5878 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5879 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5880 assert(_fac != NULL, "invariant");
5881 ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_FLATTENABLE]);
5882
5883 // this transfers ownership of a lot of arrays from
5884 // the parser onto the InstanceKlass*
5885 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5886
5887 // note that is not safe to use the fields in the parser from this point on
5888 assert(NULL == _cp, "invariant");
5889 assert(NULL == _fields, "invariant");
5890 assert(NULL == _methods, "invariant");
5891 assert(NULL == _inner_classes, "invariant");
5892 assert(NULL == _nest_members, "invariant");
5893 assert(NULL == _local_interfaces, "invariant");
5894 assert(NULL == _combined_annotations, "invariant");
5895
5896 if (_has_final_method) {
5897 ik->set_has_final_method();
5898 }
5899
5900 ik->copy_method_ordering(_method_ordering, CHECK);
5901 // The InstanceKlass::_methods_jmethod_ids cache
5902 // is managed on the assumption that the initial cache
5903 // size is equal to the number of methods in the class. If
5904 // that changes, then InstanceKlass::idnum_can_increment()
5905 // has to be changed accordingly.
5906 ik->set_initial_method_idnum(ik->methods()->length());
5907
5908 ik->set_this_class_index(_this_class_index);
5909
5910 if (is_unsafe_anonymous()) {
5911 // _this_class_index is a CONSTANT_Class entry that refers to this
5912 // anonymous class itself. If this class needs to refer to its own methods or
5913 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5914 // _this_class_index. However, because this class is anonymous (it's
5915 // not stored in SystemDictionary), _this_class_index cannot be resolved
5916 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5917 // Therefore, we must eagerly resolve _this_class_index now.
5918 ik->constants()->klass_at_put(_this_class_index, ik);
5919 }
5920
5921 ik->set_minor_version(_minor_version);
5922 ik->set_major_version(_major_version);
5923 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5924 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5925
5926 if (_unsafe_anonymous_host != NULL) {
5927 assert (ik->is_unsafe_anonymous(), "should be the same");
5928 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host);
5929 }
5930
5931 // Set PackageEntry for this_klass
5932 oop cl = ik->class_loader();
5933 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5934 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5935 ik->set_package(cld, CHECK);
5936
5937 const Array<Method*>* const methods = ik->methods();
5938 assert(methods != NULL, "invariant");
5939 const int methods_len = methods->length();
5940
5941 check_methods_for_intrinsics(ik, methods);
5942
5943 // Fill in field values obtained by parse_classfile_attributes
5944 if (_parsed_annotations->has_any_annotations()) {
5945 _parsed_annotations->apply_to(ik);
5946 }
5947
5948 apply_parsed_class_attributes(ik);
5949
5950 // Miranda methods
5951 if ((_num_miranda_methods > 0) ||
5952 // if this class introduced new miranda methods or
5953 (_super_klass != NULL && _super_klass->has_miranda_methods())
5954 // super class exists and this class inherited miranda methods
5955 ) {
5956 ik->set_has_miranda_methods(); // then set a flag
5957 }
5958
5959 // Fill in information needed to compute superclasses.
5960 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5961 ik->set_transitive_interfaces(_transitive_interfaces);
5962 _transitive_interfaces = NULL;
5963
5964 // Initialize itable offset tables
5965 klassItable::setup_itable_offset_table(ik);
5966
5967 // Compute transitive closure of interfaces this class implements
5968 // Do final class setup
5969 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5970 if (oop_map_blocks->nonstatic_oop_map_count > 0) {
5971 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5972 }
5973
5974 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5975 set_precomputed_flags(ik, CHECK);
5976
5977 // check if this class can access its super class
5978 check_super_class_access(ik, CHECK);
5979
5980 // check if this class can access its superinterfaces
5981 check_super_interface_access(ik, CHECK);
5982
5983 // check if this class overrides any final method
5984 check_final_method_override(ik, CHECK);
5985
5986 // reject static interface methods prior to Java 8
5987 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5988 check_illegal_static_method(ik, CHECK);
5989 }
5990
5991 // Obtain this_klass' module entry
5992 ModuleEntry* module_entry = ik->module();
5993 assert(module_entry != NULL, "module_entry should always be set");
5994
5995 // Obtain java.lang.Module
5996 Handle module_handle(THREAD, module_entry->module());
5997
5998 // Allocate mirror and initialize static fields
5999 // The create_mirror() call will also call compute_modifiers()
6000 java_lang_Class::create_mirror(ik,
6001 Handle(THREAD, _loader_data->class_loader()),
6002 module_handle,
6003 _protection_domain,
6004 CHECK);
6005
6006 assert(_all_mirandas != NULL, "invariant");
6007
6008 // Generate any default methods - default methods are public interface methods
6009 // that have a default implementation. This is new with Java 8.
6010 if (_has_nonstatic_concrete_methods) {
6011 DefaultMethods::generate_default_methods(ik,
6012 _all_mirandas,
6013 CHECK);
6014 }
6015
6016 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
6017 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
6018 !module_entry->has_default_read_edges()) {
6019 if (!module_entry->set_has_default_read_edges()) {
6020 // We won a potential race
6021 JvmtiExport::add_default_read_edges(module_handle, THREAD);
6022 }
6023 }
6024
6025 int nfields = ik->java_fields_count();
6026 if (ik->is_value()) nfields++;
6027 for (int i = 0; i < nfields; i++) {
6028 if (ik->field_access_flags(i) & JVM_ACC_FLATTENABLE) {
6029 Symbol* klass_name = ik->field_signature(i)->fundamental_name(CHECK);
6030 // Value classes must have been pre-loaded
6031 Klass* klass = SystemDictionary::find(klass_name,
6032 Handle(THREAD, ik->class_loader()),
6033 Handle(THREAD, ik->protection_domain()), CHECK);
6034 assert(klass != NULL, "Sanity check");
6035 assert(klass->access_flags().is_value_type(), "Value type expected");
6036 ik->set_value_field_klass(i, klass);
6037 klass_name->decrement_refcount();
6038 } else if (is_value_type() && ((ik->field_access_flags(i) & JVM_ACC_FIELD_INTERNAL) != 0)
6039 && ((ik->field_access_flags(i) & JVM_ACC_STATIC) != 0)) {
6040 ValueKlass::cast(ik)->set_default_value_offset(ik->field_offset(i));
6041 }
6042 }
6043
6044 if (is_value_type()) {
6045 ValueKlass::cast(ik)->initialize_calling_convention(CHECK);
6046 }
6047
6048 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
6049
6050 if (!is_internal()) {
6051 if (log_is_enabled(Info, class, load)) {
6052 ResourceMark rm;
6053 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
6054 ik->print_class_load_logging(_loader_data, module_name, _stream);
6055 }
6056
6057 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
6058 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
6059 log_is_enabled(Info, class, preview)) {
6060 ResourceMark rm;
6061 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
6062 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
6063 }
6064
6065 if (log_is_enabled(Debug, class, resolve)) {
6066 ResourceMark rm;
6067 // print out the superclass.
6068 const char * from = ik->external_name();
6069 if (ik->java_super() != NULL) {
6070 log_debug(class, resolve)("%s %s (super)",
6071 from,
6072 ik->java_super()->external_name());
6073 }
6074 // print out each of the interface classes referred to by this class.
6075 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
6076 if (local_interfaces != NULL) {
6077 const int length = local_interfaces->length();
6078 for (int i = 0; i < length; i++) {
6079 const InstanceKlass* const k = local_interfaces->at(i);
6080 const char * to = k->external_name();
6081 log_debug(class, resolve)("%s %s (interface)", from, to);
6082 }
6083 }
6084 }
6085 }
6086
6087 JFR_ONLY(INIT_ID(ik);)
6088
6089 // If we reach here, all is well.
6090 // Now remove the InstanceKlass* from the _klass_to_deallocate field
6091 // in order for it to not be destroyed in the ClassFileParser destructor.
6092 set_klass_to_deallocate(NULL);
6093
6094 // it's official
6095 set_klass(ik);
6096
6097 debug_only(ik->verify();)
6098 }
6099
6100 void ClassFileParser::update_class_name(Symbol* new_class_name) {
6101 // Decrement the refcount in the old name, since we're clobbering it.
6102 _class_name->decrement_refcount();
6103
6104 _class_name = new_class_name;
6105 // Increment the refcount of the new name.
6106 // Now the ClassFileParser owns this name and will decrement in
6107 // the destructor.
6108 _class_name->increment_refcount();
6109 }
6110
6111
6112 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's
6113 // package by prepending its host class's package name to its class name and setting
6114 // its _class_name field.
6115 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) {
6116 ResourceMark rm(THREAD);
6117 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
6118 "Unsafe anonymous class should not be in a package");
6119 const char* host_pkg_name =
6120 ClassLoader::package_from_name(unsafe_anonymous_host->name()->as_C_string(), NULL);
6121
6122 if (host_pkg_name != NULL) {
6123 int host_pkg_len = (int)strlen(host_pkg_name);
6124 int class_name_len = _class_name->utf8_length();
6125 int symbol_len = host_pkg_len + 1 + class_name_len;
6126 char* new_anon_name = NEW_RESOURCE_ARRAY(char, symbol_len + 1);
6127 int n = os::snprintf(new_anon_name, symbol_len + 1, "%s/%.*s",
6128 host_pkg_name, class_name_len, _class_name->base());
6129 assert(n == symbol_len, "Unexpected number of characters in string");
6130
6131 // Decrement old _class_name to avoid leaking.
6132 _class_name->decrement_refcount();
6133
6134 // Create a symbol and update the anonymous class name.
6135 // The new class name is created with a refcount of one. When installed into the InstanceKlass,
6136 // it'll be two and when the ClassFileParser destructor runs, it'll go back to one and get deleted
6137 // when the class is unloaded.
6138 _class_name = SymbolTable::new_symbol(new_anon_name, symbol_len);
6139 }
6140 }
6141
6142 // If the host class and the anonymous class are in the same package then do
6143 // nothing. If the anonymous class is in the unnamed package then move it to its
6144 // host's package. If the classes are in different packages then throw an IAE
6145 // exception.
6146 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) {
6147 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class");
6148
6149 const jbyte* anon_last_slash = UTF8::strrchr((const jbyte*)_class_name->base(),
6150 _class_name->utf8_length(), '/');
6151 if (anon_last_slash == NULL) { // Unnamed package
6152 prepend_host_package_name(_unsafe_anonymous_host, CHECK);
6153 } else {
6154 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) {
6155 ResourceMark rm(THREAD);
6156 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
6157 err_msg("Host class %s and anonymous class %s are in different packages",
6158 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string()));
6159 }
6160 }
6161 }
6162
6163 static bool relax_format_check_for(ClassLoaderData* loader_data) {
6164 bool trusted = (loader_data->is_the_null_class_loader_data() ||
6165 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
6166 bool need_verify =
6167 // verifyAll
6168 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
6169 // verifyRemote
6170 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
6171 return !need_verify;
6172 }
6173
6174 ClassFileParser::ClassFileParser(ClassFileStream* stream,
6175 Symbol* name,
6176 ClassLoaderData* loader_data,
6177 Handle protection_domain,
6178 const InstanceKlass* unsafe_anonymous_host,
6179 GrowableArray<Handle>* cp_patches,
6180 Publicity pub_level,
6181 TRAPS) :
6182 _stream(stream),
6183 _requested_name(name),
6184 _class_name(NULL),
6185 _loader_data(loader_data),
6186 _unsafe_anonymous_host(unsafe_anonymous_host),
6187 _cp_patches(cp_patches),
6188 _num_patched_klasses(0),
6189 _max_num_patched_klasses(0),
6190 _orig_cp_size(0),
6191 _first_patched_klass_resolved_index(0),
6192 _super_klass(),
6193 _cp(NULL),
6194 _fields(NULL),
6195 _methods(NULL),
6196 _inner_classes(NULL),
6197 _nest_members(NULL),
6198 _nest_host(0),
6199 _local_interfaces(NULL),
6200 _transitive_interfaces(NULL),
6201 _combined_annotations(NULL),
6202 _annotations(NULL),
6203 _type_annotations(NULL),
6204 _fields_annotations(NULL),
6205 _fields_type_annotations(NULL),
6206 _klass(NULL),
6207 _klass_to_deallocate(NULL),
6208 _parsed_annotations(NULL),
6209 _fac(NULL),
6210 _field_info(NULL),
6211 _method_ordering(NULL),
6212 _all_mirandas(NULL),
6213 _vtable_size(0),
6214 _itable_size(0),
6215 _num_miranda_methods(0),
6216 _rt(REF_NONE),
6217 _protection_domain(protection_domain),
6218 _access_flags(),
6219 _pub_level(pub_level),
6220 _bad_constant_seen(0),
6221 _synthetic_flag(false),
6222 _sde_length(false),
6223 _sde_buffer(NULL),
6224 _sourcefile_index(0),
6225 _generic_signature_index(0),
6226 _major_version(0),
6227 _minor_version(0),
6228 _this_class_index(0),
6229 _super_class_index(0),
6230 _itfs_len(0),
6231 _java_fields_count(0),
6232 _need_verify(false),
6233 _relax_verify(false),
6234 _has_nonstatic_concrete_methods(false),
6235 _declares_nonstatic_concrete_methods(false),
6236 _has_final_method(false),
6237 _has_flattenable_fields(false),
6238 _has_finalizer(false),
6239 _has_empty_finalizer(false),
6240 _has_vanilla_constructor(false),
6241 _max_bootstrap_specifier_index(-1) {
6242
6243 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6244 _class_name->increment_refcount();
6245
6246 assert(THREAD->is_Java_thread(), "invariant");
6247 assert(_loader_data != NULL, "invariant");
6248 assert(stream != NULL, "invariant");
6249 assert(_stream != NULL, "invariant");
6250 assert(_stream->buffer() == _stream->current(), "invariant");
6251 assert(_class_name != NULL, "invariant");
6252 assert(0 == _access_flags.as_int(), "invariant");
6253
6254 // Figure out whether we can skip format checking (matching classic VM behavior)
6255 if (DumpSharedSpaces) {
6256 // verify == true means it's a 'remote' class (i.e., non-boot class)
6257 // Verification decision is based on BytecodeVerificationRemote flag
6258 // for those classes.
6259 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
6260 BytecodeVerificationLocal;
6261 }
6262 else {
6263 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
6264 stream->need_verify());
6265 }
6266 if (_cp_patches != NULL) {
6267 int len = _cp_patches->length();
6268 for (int i=0; i<len; i++) {
6269 if (has_cp_patch_at(i)) {
6270 Handle patch = cp_patch_at(i);
6271 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
6272 // We need to append the names of the patched classes to the end of the constant pool,
6273 // because a patched class may have a Utf8 name that's not already included in the
6274 // original constant pool. These class names are used when patch_constant_pool()
6275 // calls patch_class().
6276 //
6277 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
6278 // At this point, we don't know the tag for index i yet, because we haven't parsed the
6279 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
6280 _max_num_patched_klasses++;
6281 }
6282 }
6283 }
6284 }
6285
6286 // synch back verification state to stream
6287 stream->set_verify(_need_verify);
6288
6289 // Check if verification needs to be relaxed for this class file
6290 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
6291 _relax_verify = relax_format_check_for(_loader_data);
6292
6293 parse_stream(stream, CHECK);
6294
6295 post_process_parsed_stream(stream, _cp, CHECK);
6296 }
6297
6298 void ClassFileParser::clear_class_metadata() {
6299 // metadata created before the instance klass is created. Must be
6300 // deallocated if classfile parsing returns an error.
6301 _cp = NULL;
6302 _fields = NULL;
6303 _methods = NULL;
6304 _inner_classes = NULL;
6305 _nest_members = NULL;
6306 _local_interfaces = NULL;
6307 _combined_annotations = NULL;
6308 _annotations = _type_annotations = NULL;
6309 _fields_annotations = _fields_type_annotations = NULL;
6310 }
6311
6312 // Destructor to clean up
6313 ClassFileParser::~ClassFileParser() {
6314 _class_name->decrement_refcount();
6315
6316 if (_cp != NULL) {
6317 MetadataFactory::free_metadata(_loader_data, _cp);
6318 }
6319 if (_fields != NULL) {
6320 MetadataFactory::free_array<u2>(_loader_data, _fields);
6321 }
6322
6323 if (_methods != NULL) {
6324 // Free methods
6325 InstanceKlass::deallocate_methods(_loader_data, _methods);
6326 }
6327
6328 // beware of the Universe::empty_blah_array!!
6329 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6330 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6331 }
6332
6333 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
6334 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6335 }
6336
6337 // Free interfaces
6338 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6339 _local_interfaces, _transitive_interfaces);
6340
6341 if (_combined_annotations != NULL) {
6342 // After all annotations arrays have been created, they are installed into the
6343 // Annotations object that will be assigned to the InstanceKlass being created.
6344
6345 // Deallocate the Annotations object and the installed annotations arrays.
6346 _combined_annotations->deallocate_contents(_loader_data);
6347
6348 // If the _combined_annotations pointer is non-NULL,
6349 // then the other annotations fields should have been cleared.
6350 assert(_annotations == NULL, "Should have been cleared");
6351 assert(_type_annotations == NULL, "Should have been cleared");
6352 assert(_fields_annotations == NULL, "Should have been cleared");
6353 assert(_fields_type_annotations == NULL, "Should have been cleared");
6354 } else {
6355 // If the annotations arrays were not installed into the Annotations object,
6356 // then they have to be deallocated explicitly.
6357 MetadataFactory::free_array<u1>(_loader_data, _annotations);
6358 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
6359 Annotations::free_contents(_loader_data, _fields_annotations);
6360 Annotations::free_contents(_loader_data, _fields_type_annotations);
6361 }
6362
6363 clear_class_metadata();
6364 _transitive_interfaces = NULL;
6365
6366 // deallocate the klass if already created. Don't directly deallocate, but add
6367 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6368 // at a safepoint.
6369 if (_klass_to_deallocate != NULL) {
6370 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6371 }
6372 }
6373
6374 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6375 TRAPS) {
6376
6377 assert(stream != NULL, "invariant");
6378 assert(_class_name != NULL, "invariant");
6379
6380 // BEGIN STREAM PARSING
6381 stream->guarantee_more(8, CHECK); // magic, major, minor
6382 // Magic value
6383 const u4 magic = stream->get_u4_fast();
6384 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6385 "Incompatible magic value %u in class file %s",
6386 magic, CHECK);
6387
6388 // Version numbers
6389 _minor_version = stream->get_u2_fast();
6390 _major_version = stream->get_u2_fast();
6391
6392 if (DumpSharedSpaces && _major_version < JAVA_6_VERSION) {
6393 ResourceMark rm;
6394 warning("Pre JDK 6 class not supported by CDS: %u.%u %s",
6395 _major_version, _minor_version, _class_name->as_C_string());
6396 Exceptions::fthrow(
6397 THREAD_AND_LOCATION,
6398 vmSymbols::java_lang_UnsupportedClassVersionError(),
6399 "Unsupported major.minor version for dump time %u.%u",
6400 _major_version,
6401 _minor_version);
6402 }
6403
6404 // Check version numbers - we check this even with verifier off
6405 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6406
6407 stream->guarantee_more(3, CHECK); // length, first cp tag
6408 u2 cp_size = stream->get_u2_fast();
6409
6410 guarantee_property(
6411 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6412 cp_size, CHECK);
6413
6414 _orig_cp_size = cp_size;
6415 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6416 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6417 }
6418 cp_size += _max_num_patched_klasses;
6419
6420 _cp = ConstantPool::allocate(_loader_data,
6421 cp_size,
6422 CHECK);
6423
6424 ConstantPool* const cp = _cp;
6425
6426 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6427
6428 assert(cp_size == (const u2)cp->length(), "invariant");
6429
6430 // ACCESS FLAGS
6431 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6432
6433 jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
6434 // JVM_ACC_MODULE is defined in JDK-9 and later.
6435 if (_major_version >= JAVA_9_VERSION) {
6436 recognized_modifiers |= JVM_ACC_MODULE;
6437 }
6438 // JVM_ACC_VALUE is defined for class file version 55 and later
6439 if (supports_value_types()) {
6440 recognized_modifiers |= JVM_ACC_VALUE;
6441 }
6442
6443 // Access flags
6444 jint flags = stream->get_u2_fast() & recognized_modifiers;
6445
6446 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6447 // Set abstract bit for old class files for backward compatibility
6448 flags |= JVM_ACC_ABSTRACT;
6449 }
6450
6451 verify_legal_class_modifiers(flags, CHECK);
6452
6453 short bad_constant = class_bad_constant_seen();
6454 if (bad_constant != 0) {
6455 // Do not throw CFE until after the access_flags are checked because if
6456 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6457 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6458 }
6459
6460 _access_flags.set_flags(flags);
6461
6462 // This class and superclass
6463 _this_class_index = stream->get_u2_fast();
6464 check_property(
6465 valid_cp_range(_this_class_index, cp_size) &&
6466 cp->tag_at(_this_class_index).is_unresolved_klass(),
6467 "Invalid this class index %u in constant pool in class file %s",
6468 _this_class_index, CHECK);
6469
6470 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6471 assert(class_name_in_cp != NULL, "class_name can't be null");
6472
6473 // Update _class_name to reflect the name in the constant pool
6474 update_class_name(class_name_in_cp);
6475
6476 // Don't need to check whether this class name is legal or not.
6477 // It has been checked when constant pool is parsed.
6478 // However, make sure it is not an array type.
6479 if (_need_verify) {
6480 guarantee_property(_class_name->char_at(0) != JVM_SIGNATURE_ARRAY,
6481 "Bad class name in class file %s",
6482 CHECK);
6483 }
6484
6485 // Checks if name in class file matches requested name
6486 if (_requested_name != NULL && _requested_name != _class_name) {
6487 ResourceMark rm(THREAD);
6488 Exceptions::fthrow(
6489 THREAD_AND_LOCATION,
6490 vmSymbols::java_lang_NoClassDefFoundError(),
6491 "%s (wrong name: %s)",
6492 _class_name->as_C_string(),
6493 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6494 );
6495 return;
6496 }
6497
6498 // if this is an anonymous class fix up its name if it's in the unnamed
6499 // package. Otherwise, throw IAE if it is in a different package than
6500 // its host class.
6501 if (_unsafe_anonymous_host != NULL) {
6502 fix_unsafe_anonymous_class_name(CHECK);
6503 }
6504
6505 // Verification prevents us from creating names with dots in them, this
6506 // asserts that that's the case.
6507 assert(is_internal_format(_class_name), "external class name format used internally");
6508
6509 if (!is_internal()) {
6510 LogTarget(Debug, class, preorder) lt;
6511 if (lt.is_enabled()){
6512 ResourceMark rm(THREAD);
6513 LogStream ls(lt);
6514 ls.print("%s", _class_name->as_klass_external_name());
6515 if (stream->source() != NULL) {
6516 ls.print(" source: %s", stream->source());
6517 }
6518 ls.cr();
6519 }
6520
6521 #if INCLUDE_CDS
6522 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6523 if (!ClassLoader::has_jrt_entry()) {
6524 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6525 DumpLoadedClassList = NULL;
6526 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6527 _unsafe_anonymous_host == NULL) {
6528 // Only dump the classes that can be stored into CDS archive.
6529 // Unsafe anonymous classes such as generated LambdaForm classes are also not included.
6530 oop class_loader = _loader_data->class_loader();
6531 ResourceMark rm(THREAD);
6532 bool skip = false;
6533 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6534 // For the boot and platform class loaders, skip classes that are not found in the
6535 // java runtime image, such as those found in the --patch-module entries.
6536 // These classes can't be loaded from the archive during runtime.
6537 if (!stream->from_boot_loader_modules_image() && strncmp(stream->source(), "jrt:", 4) != 0) {
6538 skip = true;
6539 }
6540
6541 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6542 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6543 // as they can be loaded from the archive during runtime.
6544 skip = false;
6545 }
6546 }
6547 if (skip) {
6548 tty->print_cr("skip writing class %s from source %s to classlist file",
6549 _class_name->as_C_string(), stream->source());
6550 } else {
6551 classlist_file->print_cr("%s", _class_name->as_C_string());
6552 classlist_file->flush();
6553 }
6554 }
6555 }
6556 #endif
6557 }
6558
6559 // SUPERKLASS
6560 _super_class_index = stream->get_u2_fast();
6561 _super_klass = parse_super_class(cp,
6562 _super_class_index,
6563 _need_verify,
6564 CHECK);
6565
6566 // Interfaces
6567 _itfs_len = stream->get_u2_fast();
6568 parse_interfaces(stream,
6569 _itfs_len,
6570 cp,
6571 &_has_nonstatic_concrete_methods,
6572 CHECK);
6573
6574 assert(_local_interfaces != NULL, "invariant");
6575
6576 // Fields (offsets are filled in later)
6577 _fac = new FieldAllocationCount();
6578 parse_fields(stream,
6579 _access_flags.is_interface(),
6580 _access_flags.is_value_type(),
6581 _fac,
6582 cp,
6583 cp_size,
6584 &_java_fields_count,
6585 CHECK);
6586
6587 assert(_fields != NULL, "invariant");
6588
6589 // Methods
6590 AccessFlags promoted_flags;
6591 parse_methods(stream,
6592 _access_flags.is_interface(),
6593 _access_flags.is_value_type(),
6594 &promoted_flags,
6595 &_has_final_method,
6596 &_declares_nonstatic_concrete_methods,
6597 CHECK);
6598
6599 assert(_methods != NULL, "invariant");
6600
6601 // promote flags from parse_methods() to the klass' flags
6602 _access_flags.add_promoted_flags(promoted_flags.as_int());
6603
6604 if (_declares_nonstatic_concrete_methods) {
6605 _has_nonstatic_concrete_methods = true;
6606 }
6607
6608 // Additional attributes/annotations
6609 _parsed_annotations = new ClassAnnotationCollector();
6610 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6611
6612 assert(_inner_classes != NULL, "invariant");
6613
6614 // Finalize the Annotations metadata object,
6615 // now that all annotation arrays have been created.
6616 create_combined_annotations(CHECK);
6617
6618 // Make sure this is the end of class file stream
6619 guarantee_property(stream->at_eos(),
6620 "Extra bytes at the end of class file %s",
6621 CHECK);
6622
6623 // all bytes in stream read and parsed
6624 }
6625
6626 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6627 ConstantPool* cp,
6628 TRAPS) {
6629 assert(stream != NULL, "invariant");
6630 assert(stream->at_eos(), "invariant");
6631 assert(cp != NULL, "invariant");
6632 assert(_loader_data != NULL, "invariant");
6633
6634 if (_class_name == vmSymbols::java_lang_Object()) {
6635 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6636 "java.lang.Object cannot implement an interface in class file %s",
6637 CHECK);
6638 }
6639 // We check super class after class file is parsed and format is checked
6640 if (_super_class_index > 0 && NULL ==_super_klass) {
6641 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6642 if (_access_flags.is_interface()) {
6643 // Before attempting to resolve the superclass, check for class format
6644 // errors not checked yet.
6645 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6646 "Interfaces must have java.lang.Object as superclass in class file %s",
6647 CHECK);
6648 }
6649 Handle loader(THREAD, _loader_data->class_loader());
6650 _super_klass = (const InstanceKlass*)
6651 SystemDictionary::resolve_super_or_fail(_class_name,
6652 super_class_name,
6653 loader,
6654 _protection_domain,
6655 true,
6656 CHECK);
6657 }
6658
6659 if (_super_klass != NULL) {
6660 if (_super_klass->has_nonstatic_concrete_methods()) {
6661 _has_nonstatic_concrete_methods = true;
6662 }
6663
6664 if (_super_klass->is_interface()) {
6665 ResourceMark rm(THREAD);
6666 Exceptions::fthrow(
6667 THREAD_AND_LOCATION,
6668 vmSymbols::java_lang_IncompatibleClassChangeError(),
6669 "class %s has interface %s as super class",
6670 _class_name->as_klass_external_name(),
6671 _super_klass->external_name()
6672 );
6673 return;
6674 }
6675
6676 // For a value class, only java/lang/Object is an acceptable super class
6677 if (_access_flags.get_flags() & JVM_ACC_VALUE) {
6678 guarantee_property(_super_klass->name() == vmSymbols::java_lang_Object(),
6679 "Value type must have java.lang.Object as superclass in class file %s",
6680 CHECK);
6681 }
6682
6683 // Make sure super class is not final
6684 if (_super_klass->is_final()) {
6685 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6686 }
6687 }
6688
6689 // Compute the transitive list of all unique interfaces implemented by this class
6690 _transitive_interfaces =
6691 compute_transitive_interfaces(_super_klass,
6692 _local_interfaces,
6693 _loader_data,
6694 CHECK);
6695
6696 assert(_transitive_interfaces != NULL, "invariant");
6697
6698 // sort methods
6699 _method_ordering = sort_methods(_methods);
6700
6701 _all_mirandas = new GrowableArray<Method*>(20);
6702
6703 Handle loader(THREAD, _loader_data->class_loader());
6704 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6705 &_num_miranda_methods,
6706 _all_mirandas,
6707 _super_klass,
6708 _methods,
6709 _access_flags,
6710 _major_version,
6711 loader,
6712 _class_name,
6713 _local_interfaces,
6714 CHECK);
6715
6716 // Size of Java itable (in words)
6717 _itable_size = _access_flags.is_interface() ? 0 :
6718 klassItable::compute_itable_size(_transitive_interfaces);
6719
6720 assert(_fac != NULL, "invariant");
6721 assert(_parsed_annotations != NULL, "invariant");
6722
6723
6724 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
6725 if (fs.is_flattenable()) {
6726 // Pre-load value class
6727 Klass* klass = SystemDictionary::resolve_flattenable_field_or_fail(&fs,
6728 Handle(THREAD, _loader_data->class_loader()),
6729 _protection_domain, true, CHECK);
6730 assert(klass != NULL, "Sanity check");
6731 assert(klass->access_flags().is_value_type(), "Value type expected");
6732 _has_flattenable_fields = true;
6733 }
6734 }
6735
6736 _field_info = new FieldLayoutInfo();
6737 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6738
6739 // Compute reference typ
6740 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6741
6742 }
6743
6744 void ClassFileParser::set_klass(InstanceKlass* klass) {
6745
6746 #ifdef ASSERT
6747 if (klass != NULL) {
6748 assert(NULL == _klass, "leaking?");
6749 }
6750 #endif
6751
6752 _klass = klass;
6753 }
6754
6755 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6756
6757 #ifdef ASSERT
6758 if (klass != NULL) {
6759 assert(NULL == _klass_to_deallocate, "leaking?");
6760 }
6761 #endif
6762
6763 _klass_to_deallocate = klass;
6764 }
6765
6766 // Caller responsible for ResourceMark
6767 // clone stream with rewound position
6768 const ClassFileStream* ClassFileParser::clone_stream() const {
6769 assert(_stream != NULL, "invariant");
6770
6771 return _stream->clone();
6772 }
6773
6774 // ----------------------------------------------------------------------------
6775 // debugging
6776
6777 #ifdef ASSERT
6778
6779 // return true if class_name contains no '.' (internal format is '/')
6780 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6781 if (class_name != NULL) {
6782 ResourceMark rm;
6783 char* name = class_name->as_C_string();
6784 return strchr(name, '.') == NULL;
6785 } else {
6786 return true;
6787 }
6788 }
6789
6790 #endif