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