1 /*
2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24 #include "precompiled.hpp"
25 #include "jvm.h"
26 #include "aot/aotLoader.hpp"
27 #include "classfile/classFileParser.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/defaultMethods.hpp"
32 #include "classfile/dictionary.hpp"
33 #include "classfile/fieldLayoutBuilder.hpp"
34 #include "classfile/javaClasses.inline.hpp"
35 #include "classfile/moduleEntry.hpp"
36 #include "classfile/packageEntry.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/verificationType.hpp"
40 #include "classfile/verifier.hpp"
41 #include "classfile/vmSymbols.hpp"
42 #include "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "memory/allocation.hpp"
45 #include "memory/metadataFactory.hpp"
46 #include "memory/oopFactory.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "oops/annotations.hpp"
50 #include "oops/constantPool.inline.hpp"
51 #include "oops/fieldStreams.inline.hpp"
52 #include "oops/instanceKlass.hpp"
53 #include "oops/instanceMirrorKlass.hpp"
54 #include "oops/klass.inline.hpp"
55 #include "oops/klassVtable.hpp"
56 #include "oops/metadata.hpp"
57 #include "oops/method.inline.hpp"
58 #include "oops/oop.inline.hpp"
59 #include "oops/recordComponent.hpp"
60 #include "oops/symbol.hpp"
61 #include "prims/jvmtiExport.hpp"
62 #include "prims/jvmtiThreadState.hpp"
63 #include "runtime/arguments.hpp"
64 #include "runtime/fieldDescriptor.inline.hpp"
65 #include "runtime/handles.inline.hpp"
66 #include "runtime/javaCalls.hpp"
67 #include "runtime/os.hpp"
68 #include "runtime/perfData.hpp"
69 #include "runtime/reflection.hpp"
70 #include "runtime/safepointVerifiers.hpp"
71 #include "runtime/signature.hpp"
72 #include "runtime/timer.hpp"
73 #include "services/classLoadingService.hpp"
74 #include "services/threadService.hpp"
75 #include "utilities/align.hpp"
76 #include "utilities/bitMap.inline.hpp"
77 #include "utilities/copy.hpp"
78 #include "utilities/exceptions.hpp"
79 #include "utilities/globalDefinitions.hpp"
80 #include "utilities/growableArray.hpp"
81 #include "utilities/macros.hpp"
82 #include "utilities/ostream.hpp"
83 #include "utilities/resourceHash.hpp"
84 #include "utilities/utf8.hpp"
85
86 #if INCLUDE_CDS
87 #include "classfile/systemDictionaryShared.hpp"
88 #endif
89 #if INCLUDE_JFR
90 #include "jfr/support/jfrTraceIdExtension.hpp"
91 #endif
92
93 // We generally try to create the oops directly when parsing, rather than
94 // allocating temporary data structures and copying the bytes twice. A
95 // temporary area is only needed when parsing utf8 entries in the constant
96 // pool and when parsing line number tables.
97
98 // We add assert in debug mode when class format is not checked.
99
100 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
101 #define JAVA_MIN_SUPPORTED_VERSION 45
102 #define JAVA_PREVIEW_MINOR_VERSION 65535
103
104 // Used for two backward compatibility reasons:
105 // - to check for new additions to the class file format in JDK1.5
106 // - to check for bug fixes in the format checker in JDK1.5
107 #define JAVA_1_5_VERSION 49
108
109 // Used for backward compatibility reasons:
110 // - to check for javac bug fixes that happened after 1.5
111 // - also used as the max version when running in jdk6
112 #define JAVA_6_VERSION 50
113
114 // Used for backward compatibility reasons:
115 // - to disallow argument and require ACC_STATIC for <clinit> methods
116 #define JAVA_7_VERSION 51
117
118 // Extension method support.
119 #define JAVA_8_VERSION 52
120
121 #define JAVA_9_VERSION 53
122
123 #define JAVA_10_VERSION 54
124
125 #define JAVA_11_VERSION 55
126
127 #define JAVA_12_VERSION 56
128
129 #define JAVA_13_VERSION 57
130
131 #define JAVA_14_VERSION 58
132
133 #define JAVA_15_VERSION 59
134
135 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
136 assert((bad_constant == JVM_CONSTANT_Module ||
137 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
138 "Unexpected bad constant pool entry");
139 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
140 }
141
142 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
143 ConstantPool* cp,
144 const int length,
145 TRAPS) {
146 assert(stream != NULL, "invariant");
147 assert(cp != NULL, "invariant");
148
149 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
150 // this function (_current can be allocated in a register, with scalar
151 // replacement of aggregates). The _current pointer is copied back to
152 // stream() when this function returns. DON'T call another method within
153 // this method that uses stream().
154 const ClassFileStream cfs1 = *stream;
155 const ClassFileStream* const cfs = &cfs1;
156
157 assert(cfs->allocated_on_stack(), "should be local");
158 debug_only(const u1* const old_current = stream->current();)
159
160 // Used for batching symbol allocations.
161 const char* names[SymbolTable::symbol_alloc_batch_size];
162 int lengths[SymbolTable::symbol_alloc_batch_size];
163 int indices[SymbolTable::symbol_alloc_batch_size];
164 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
165 int names_count = 0;
166
167 // parsing Index 0 is unused
168 for (int index = 1; index < length; index++) {
169 // Each of the following case guarantees one more byte in the stream
170 // for the following tag or the access_flags following constant pool,
171 // so we don't need bounds-check for reading tag.
172 const u1 tag = cfs->get_u1_fast();
173 switch (tag) {
174 case JVM_CONSTANT_Class : {
175 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
176 const u2 name_index = cfs->get_u2_fast();
177 cp->klass_index_at_put(index, name_index);
178 break;
179 }
180 case JVM_CONSTANT_Fieldref: {
181 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
182 const u2 class_index = cfs->get_u2_fast();
183 const u2 name_and_type_index = cfs->get_u2_fast();
184 cp->field_at_put(index, class_index, name_and_type_index);
185 break;
186 }
187 case JVM_CONSTANT_Methodref: {
188 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
189 const u2 class_index = cfs->get_u2_fast();
190 const u2 name_and_type_index = cfs->get_u2_fast();
191 cp->method_at_put(index, class_index, name_and_type_index);
192 break;
193 }
194 case JVM_CONSTANT_InterfaceMethodref: {
195 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
196 const u2 class_index = cfs->get_u2_fast();
197 const u2 name_and_type_index = cfs->get_u2_fast();
198 cp->interface_method_at_put(index, class_index, name_and_type_index);
199 break;
200 }
201 case JVM_CONSTANT_String : {
202 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
203 const u2 string_index = cfs->get_u2_fast();
204 cp->string_index_at_put(index, string_index);
205 break;
206 }
207 case JVM_CONSTANT_MethodHandle :
208 case JVM_CONSTANT_MethodType: {
209 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
210 classfile_parse_error(
211 "Class file version does not support constant tag %u in class file %s",
212 tag, CHECK);
213 }
214 if (tag == JVM_CONSTANT_MethodHandle) {
215 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
216 const u1 ref_kind = cfs->get_u1_fast();
217 const u2 method_index = cfs->get_u2_fast();
218 cp->method_handle_index_at_put(index, ref_kind, method_index);
219 }
220 else if (tag == JVM_CONSTANT_MethodType) {
221 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
222 const u2 signature_index = cfs->get_u2_fast();
223 cp->method_type_index_at_put(index, signature_index);
224 }
225 else {
226 ShouldNotReachHere();
227 }
228 break;
229 }
230 case JVM_CONSTANT_Dynamic : {
231 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
232 classfile_parse_error(
233 "Class file version does not support constant tag %u in class file %s",
234 tag, CHECK);
235 }
236 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
237 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
238 const u2 name_and_type_index = cfs->get_u2_fast();
239 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
240 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
241 }
242 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
243 break;
244 }
245 case JVM_CONSTANT_InvokeDynamic : {
246 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
247 classfile_parse_error(
248 "Class file version does not support constant tag %u in class file %s",
249 tag, CHECK);
250 }
251 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
252 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
253 const u2 name_and_type_index = cfs->get_u2_fast();
254 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
255 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
256 }
257 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
258 break;
259 }
260 case JVM_CONSTANT_Integer: {
261 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
262 const u4 bytes = cfs->get_u4_fast();
263 cp->int_at_put(index, (jint)bytes);
264 break;
265 }
266 case JVM_CONSTANT_Float: {
267 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
268 const u4 bytes = cfs->get_u4_fast();
269 cp->float_at_put(index, *(jfloat*)&bytes);
270 break;
271 }
272 case JVM_CONSTANT_Long: {
273 // A mangled type might cause you to overrun allocated memory
274 guarantee_property(index + 1 < length,
275 "Invalid constant pool entry %u in class file %s",
276 index,
277 CHECK);
278 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
279 const u8 bytes = cfs->get_u8_fast();
280 cp->long_at_put(index, bytes);
281 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
282 break;
283 }
284 case JVM_CONSTANT_Double: {
285 // A mangled type might cause you to overrun allocated memory
286 guarantee_property(index+1 < length,
287 "Invalid constant pool entry %u in class file %s",
288 index,
289 CHECK);
290 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
291 const u8 bytes = cfs->get_u8_fast();
292 cp->double_at_put(index, *(jdouble*)&bytes);
293 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
294 break;
295 }
296 case JVM_CONSTANT_NameAndType: {
297 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
298 const u2 name_index = cfs->get_u2_fast();
299 const u2 signature_index = cfs->get_u2_fast();
300 cp->name_and_type_at_put(index, name_index, signature_index);
301 break;
302 }
303 case JVM_CONSTANT_Utf8 : {
304 cfs->guarantee_more(2, CHECK); // utf8_length
305 u2 utf8_length = cfs->get_u2_fast();
306 const u1* utf8_buffer = cfs->current();
307 assert(utf8_buffer != NULL, "null utf8 buffer");
308 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
309 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
310 cfs->skip_u1_fast(utf8_length);
311
312 // Before storing the symbol, make sure it's legal
313 if (_need_verify) {
314 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
315 }
316
317 if (has_cp_patch_at(index)) {
318 Handle patch = clear_cp_patch_at(index);
319 guarantee_property(java_lang_String::is_instance(patch()),
320 "Illegal utf8 patch at %d in class file %s",
321 index,
322 CHECK);
323 const char* const str = java_lang_String::as_utf8_string(patch());
324 // (could use java_lang_String::as_symbol instead, but might as well batch them)
325 utf8_buffer = (const u1*) str;
326 utf8_length = (u2) strlen(str);
327 }
328
329 unsigned int hash;
330 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
331 utf8_length,
332 hash);
333 if (result == NULL) {
334 names[names_count] = (const char*)utf8_buffer;
335 lengths[names_count] = utf8_length;
336 indices[names_count] = index;
337 hashValues[names_count++] = hash;
338 if (names_count == SymbolTable::symbol_alloc_batch_size) {
339 SymbolTable::new_symbols(_loader_data,
340 constantPoolHandle(THREAD, cp),
341 names_count,
342 names,
343 lengths,
344 indices,
345 hashValues);
346 names_count = 0;
347 }
348 } else {
349 cp->symbol_at_put(index, result);
350 }
351 break;
352 }
353 case JVM_CONSTANT_Module:
354 case JVM_CONSTANT_Package: {
355 // Record that an error occurred in these two cases but keep parsing so
356 // that ACC_Module can be checked for in the access_flags. Need to
357 // throw NoClassDefFoundError in that case.
358 if (_major_version >= JAVA_9_VERSION) {
359 cfs->guarantee_more(3, CHECK);
360 cfs->get_u2_fast();
361 set_class_bad_constant_seen(tag);
362 break;
363 }
364 }
365 default: {
366 classfile_parse_error("Unknown constant tag %u in class file %s",
367 tag,
368 CHECK);
369 break;
370 }
371 } // end of switch(tag)
372 } // end of for
373
374 // Allocate the remaining symbols
375 if (names_count > 0) {
376 SymbolTable::new_symbols(_loader_data,
377 constantPoolHandle(THREAD, cp),
378 names_count,
379 names,
380 lengths,
381 indices,
382 hashValues);
383 }
384
385 // Copy _current pointer of local copy back to stream.
386 assert(stream->current() == old_current, "non-exclusive use of stream");
387 stream->set_current(cfs1.current());
388
389 }
390
391 static inline bool valid_cp_range(int index, int length) {
392 return (index > 0 && index < length);
393 }
394
395 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
396 assert(cp != NULL, "invariant");
397 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
398 return cp->symbol_at(index);
399 }
400 return NULL;
401 }
402
403 #ifdef ASSERT
404 PRAGMA_DIAG_PUSH
405 PRAGMA_FORMAT_NONLITERAL_IGNORED
406 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
407 ResourceMark rm(THREAD);
408 fatal(msg, _class_name->as_C_string());
409 }
410
411 void ClassFileParser::report_assert_property_failure(const char* msg,
412 int index,
413 TRAPS) const {
414 ResourceMark rm(THREAD);
415 fatal(msg, index, _class_name->as_C_string());
416 }
417 PRAGMA_DIAG_POP
418 #endif
419
420 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
421 ConstantPool* const cp,
422 const int length,
423 TRAPS) {
424 assert(cp != NULL, "invariant");
425 assert(stream != NULL, "invariant");
426
427 // parsing constant pool entries
428 parse_constant_pool_entries(stream, cp, length, CHECK);
429 if (class_bad_constant_seen() != 0) {
430 // a bad CP entry has been detected previously so stop parsing and just return.
431 return;
432 }
433
434 int index = 1; // declared outside of loops for portability
435 int num_klasses = 0;
436
437 // first verification pass - validate cross references
438 // and fixup class and string constants
439 for (index = 1; index < length; index++) { // Index 0 is unused
440 const jbyte tag = cp->tag_at(index).value();
441 switch (tag) {
442 case JVM_CONSTANT_Class: {
443 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
444 break;
445 }
446 case JVM_CONSTANT_Fieldref:
447 // fall through
448 case JVM_CONSTANT_Methodref:
449 // fall through
450 case JVM_CONSTANT_InterfaceMethodref: {
451 if (!_need_verify) break;
452 const int klass_ref_index = cp->klass_ref_index_at(index);
453 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
454 check_property(valid_klass_reference_at(klass_ref_index),
455 "Invalid constant pool index %u in class file %s",
456 klass_ref_index, CHECK);
457 check_property(valid_cp_range(name_and_type_ref_index, length) &&
458 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
459 "Invalid constant pool index %u in class file %s",
460 name_and_type_ref_index, CHECK);
461 break;
462 }
463 case JVM_CONSTANT_String: {
464 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
465 break;
466 }
467 case JVM_CONSTANT_Integer:
468 break;
469 case JVM_CONSTANT_Float:
470 break;
471 case JVM_CONSTANT_Long:
472 case JVM_CONSTANT_Double: {
473 index++;
474 check_property(
475 (index < length && cp->tag_at(index).is_invalid()),
476 "Improper constant pool long/double index %u in class file %s",
477 index, CHECK);
478 break;
479 }
480 case JVM_CONSTANT_NameAndType: {
481 if (!_need_verify) break;
482 const int name_ref_index = cp->name_ref_index_at(index);
483 const int signature_ref_index = cp->signature_ref_index_at(index);
484 check_property(valid_symbol_at(name_ref_index),
485 "Invalid constant pool index %u in class file %s",
486 name_ref_index, CHECK);
487 check_property(valid_symbol_at(signature_ref_index),
488 "Invalid constant pool index %u in class file %s",
489 signature_ref_index, CHECK);
490 break;
491 }
492 case JVM_CONSTANT_Utf8:
493 break;
494 case JVM_CONSTANT_UnresolvedClass: // fall-through
495 case JVM_CONSTANT_UnresolvedClassInError: {
496 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
497 break;
498 }
499 case JVM_CONSTANT_ClassIndex: {
500 const int class_index = cp->klass_index_at(index);
501 check_property(valid_symbol_at(class_index),
502 "Invalid constant pool index %u in class file %s",
503 class_index, CHECK);
504 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
505 break;
506 }
507 case JVM_CONSTANT_StringIndex: {
508 const int string_index = cp->string_index_at(index);
509 check_property(valid_symbol_at(string_index),
510 "Invalid constant pool index %u in class file %s",
511 string_index, CHECK);
512 Symbol* const sym = cp->symbol_at(string_index);
513 cp->unresolved_string_at_put(index, sym);
514 break;
515 }
516 case JVM_CONSTANT_MethodHandle: {
517 const int ref_index = cp->method_handle_index_at(index);
518 check_property(valid_cp_range(ref_index, length),
519 "Invalid constant pool index %u in class file %s",
520 ref_index, CHECK);
521 const constantTag tag = cp->tag_at(ref_index);
522 const int ref_kind = cp->method_handle_ref_kind_at(index);
523
524 switch (ref_kind) {
525 case JVM_REF_getField:
526 case JVM_REF_getStatic:
527 case JVM_REF_putField:
528 case JVM_REF_putStatic: {
529 check_property(
530 tag.is_field(),
531 "Invalid constant pool index %u in class file %s (not a field)",
532 ref_index, CHECK);
533 break;
534 }
535 case JVM_REF_invokeVirtual:
536 case JVM_REF_newInvokeSpecial: {
537 check_property(
538 tag.is_method(),
539 "Invalid constant pool index %u in class file %s (not a method)",
540 ref_index, CHECK);
541 break;
542 }
543 case JVM_REF_invokeStatic:
544 case JVM_REF_invokeSpecial: {
545 check_property(
546 tag.is_method() ||
547 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
548 "Invalid constant pool index %u in class file %s (not a method)",
549 ref_index, CHECK);
550 break;
551 }
552 case JVM_REF_invokeInterface: {
553 check_property(
554 tag.is_interface_method(),
555 "Invalid constant pool index %u in class file %s (not an interface method)",
556 ref_index, CHECK);
557 break;
558 }
559 default: {
560 classfile_parse_error(
561 "Bad method handle kind at constant pool index %u in class file %s",
562 index, CHECK);
563 }
564 } // switch(refkind)
565 // Keep the ref_index unchanged. It will be indirected at link-time.
566 break;
567 } // case MethodHandle
568 case JVM_CONSTANT_MethodType: {
569 const int ref_index = cp->method_type_index_at(index);
570 check_property(valid_symbol_at(ref_index),
571 "Invalid constant pool index %u in class file %s",
572 ref_index, CHECK);
573 break;
574 }
575 case JVM_CONSTANT_Dynamic: {
576 const int name_and_type_ref_index =
577 cp->bootstrap_name_and_type_ref_index_at(index);
578
579 check_property(valid_cp_range(name_and_type_ref_index, length) &&
580 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
581 "Invalid constant pool index %u in class file %s",
582 name_and_type_ref_index, CHECK);
583 // bootstrap specifier index must be checked later,
584 // when BootstrapMethods attr is available
585
586 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
587 cp->set_has_dynamic_constant();
588 break;
589 }
590 case JVM_CONSTANT_InvokeDynamic: {
591 const int name_and_type_ref_index =
592 cp->bootstrap_name_and_type_ref_index_at(index);
593
594 check_property(valid_cp_range(name_and_type_ref_index, length) &&
595 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
596 "Invalid constant pool index %u in class file %s",
597 name_and_type_ref_index, CHECK);
598 // bootstrap specifier index must be checked later,
599 // when BootstrapMethods attr is available
600 break;
601 }
602 default: {
603 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
604 ShouldNotReachHere();
605 break;
606 }
607 } // switch(tag)
608 } // end of for
609
610 _first_patched_klass_resolved_index = num_klasses;
611 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
612
613 if (_cp_patches != NULL) {
614 // need to treat this_class specially...
615
616 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
617 // for now. These will be replaced with actual names of the patched classes in patch_class().
618 Symbol* s = vmSymbols::star_name();
619 for (int n=_orig_cp_size; n<cp->length(); n++) {
620 cp->symbol_at_put(n, s);
621 }
622
623 int this_class_index;
624 {
625 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
626 const u1* const mark = stream->current();
627 stream->skip_u2_fast(1); // skip flags
628 this_class_index = stream->get_u2_fast();
629 stream->set_current(mark); // revert to mark
630 }
631
632 for (index = 1; index < length; index++) { // Index 0 is unused
633 if (has_cp_patch_at(index)) {
634 guarantee_property(index != this_class_index,
635 "Illegal constant pool patch to self at %d in class file %s",
636 index, CHECK);
637 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
638 }
639 }
640 }
641
642 if (!_need_verify) {
643 return;
644 }
645
646 // second verification pass - checks the strings are of the right format.
647 // but not yet to the other entries
648 for (index = 1; index < length; index++) {
649 const jbyte tag = cp->tag_at(index).value();
650 switch (tag) {
651 case JVM_CONSTANT_UnresolvedClass: {
652 const Symbol* const class_name = cp->klass_name_at(index);
653 // check the name, even if _cp_patches will overwrite it
654 verify_legal_class_name(class_name, CHECK);
655 break;
656 }
657 case JVM_CONSTANT_NameAndType: {
658 if (_need_verify) {
659 const int sig_index = cp->signature_ref_index_at(index);
660 const int name_index = cp->name_ref_index_at(index);
661 const Symbol* const name = cp->symbol_at(name_index);
662 const Symbol* const sig = cp->symbol_at(sig_index);
663 guarantee_property(sig->utf8_length() != 0,
664 "Illegal zero length constant pool entry at %d in class %s",
665 sig_index, CHECK);
666 guarantee_property(name->utf8_length() != 0,
667 "Illegal zero length constant pool entry at %d in class %s",
668 name_index, CHECK);
669
670 if (Signature::is_method(sig)) {
671 // Format check method name and signature
672 verify_legal_method_name(name, CHECK);
673 verify_legal_method_signature(name, sig, CHECK);
674 } else {
675 // Format check field name and signature
676 verify_legal_field_name(name, CHECK);
677 verify_legal_field_signature(name, sig, CHECK);
678 }
679 }
680 break;
681 }
682 case JVM_CONSTANT_Dynamic: {
683 const int name_and_type_ref_index =
684 cp->name_and_type_ref_index_at(index);
685 // already verified to be utf8
686 const int name_ref_index =
687 cp->name_ref_index_at(name_and_type_ref_index);
688 // already verified to be utf8
689 const int signature_ref_index =
690 cp->signature_ref_index_at(name_and_type_ref_index);
691 const Symbol* const name = cp->symbol_at(name_ref_index);
692 const Symbol* const signature = cp->symbol_at(signature_ref_index);
693 if (_need_verify) {
694 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
695 // Need only to be sure signature is the right type.
696 if (Signature::is_method(signature)) {
697 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
698 }
699 }
700 break;
701 }
702 case JVM_CONSTANT_InvokeDynamic:
703 case JVM_CONSTANT_Fieldref:
704 case JVM_CONSTANT_Methodref:
705 case JVM_CONSTANT_InterfaceMethodref: {
706 const int name_and_type_ref_index =
707 cp->name_and_type_ref_index_at(index);
708 // already verified to be utf8
709 const int name_ref_index =
710 cp->name_ref_index_at(name_and_type_ref_index);
711 // already verified to be utf8
712 const int signature_ref_index =
713 cp->signature_ref_index_at(name_and_type_ref_index);
714 const Symbol* const name = cp->symbol_at(name_ref_index);
715 const Symbol* const signature = cp->symbol_at(signature_ref_index);
716 if (tag == JVM_CONSTANT_Fieldref) {
717 if (_need_verify) {
718 // Field name and signature are verified above, when iterating NameAndType_info.
719 // Need only to be sure signature is non-zero length and the right type.
720 if (Signature::is_method(signature)) {
721 throwIllegalSignature("Field", name, signature, CHECK);
722 }
723 }
724 } else {
725 if (_need_verify) {
726 // Method name and signature are verified above, when iterating NameAndType_info.
727 // Need only to be sure signature is non-zero length and the right type.
728 if (!Signature::is_method(signature)) {
729 throwIllegalSignature("Method", name, signature, CHECK);
730 }
731 }
732 // 4509014: If a class method name begins with '<', it must be "<init>"
733 const unsigned int name_len = name->utf8_length();
734 if (tag == JVM_CONSTANT_Methodref &&
735 name_len != 0 &&
736 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
737 name != vmSymbols::object_initializer_name()) {
738 classfile_parse_error(
739 "Bad method name at constant pool index %u in class file %s",
740 name_ref_index, CHECK);
741 }
742 }
743 break;
744 }
745 case JVM_CONSTANT_MethodHandle: {
746 const int ref_index = cp->method_handle_index_at(index);
747 const int ref_kind = cp->method_handle_ref_kind_at(index);
748 switch (ref_kind) {
749 case JVM_REF_invokeVirtual:
750 case JVM_REF_invokeStatic:
751 case JVM_REF_invokeSpecial:
752 case JVM_REF_newInvokeSpecial: {
753 const int name_and_type_ref_index =
754 cp->name_and_type_ref_index_at(ref_index);
755 const int name_ref_index =
756 cp->name_ref_index_at(name_and_type_ref_index);
757 const Symbol* const name = cp->symbol_at(name_ref_index);
758 if (ref_kind == JVM_REF_newInvokeSpecial) {
759 if (name != vmSymbols::object_initializer_name()) {
760 classfile_parse_error(
761 "Bad constructor name at constant pool index %u in class file %s",
762 name_ref_index, CHECK);
763 }
764 } else {
765 if (name == vmSymbols::object_initializer_name()) {
766 classfile_parse_error(
767 "Bad method name at constant pool index %u in class file %s",
768 name_ref_index, CHECK);
769 }
770 }
771 break;
772 }
773 // Other ref_kinds are already fully checked in previous pass.
774 } // switch(ref_kind)
775 break;
776 }
777 case JVM_CONSTANT_MethodType: {
778 const Symbol* const no_name = vmSymbols::type_name(); // place holder
779 const Symbol* const signature = cp->method_type_signature_at(index);
780 verify_legal_method_signature(no_name, signature, CHECK);
781 break;
782 }
783 case JVM_CONSTANT_Utf8: {
784 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
785 }
786 } // switch(tag)
787 } // end of for
788 }
789
790 Handle ClassFileParser::clear_cp_patch_at(int index) {
791 Handle patch = cp_patch_at(index);
792 _cp_patches->at_put(index, Handle());
793 assert(!has_cp_patch_at(index), "");
794 return patch;
795 }
796
797 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
798 int name_index = _orig_cp_size + _num_patched_klasses;
799 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
800
801 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
802 _num_patched_klasses ++;
803 }
804
805 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
806 int index,
807 Handle patch,
808 TRAPS) {
809 assert(cp != NULL, "invariant");
810
811 BasicType patch_type = T_VOID;
812
813 switch (cp->tag_at(index).value()) {
814
815 case JVM_CONSTANT_UnresolvedClass: {
816 // Patching a class means pre-resolving it.
817 // The name in the constant pool is ignored.
818 if (java_lang_Class::is_instance(patch())) {
819 guarantee_property(!java_lang_Class::is_primitive(patch()),
820 "Illegal class patch at %d in class file %s",
821 index, CHECK);
822 Klass* k = java_lang_Class::as_Klass(patch());
823 patch_class(cp, index, k, k->name());
824 } else {
825 guarantee_property(java_lang_String::is_instance(patch()),
826 "Illegal class patch at %d in class file %s",
827 index, CHECK);
828 Symbol* const name = java_lang_String::as_symbol(patch());
829 patch_class(cp, index, NULL, name);
830 }
831 break;
832 }
833
834 case JVM_CONSTANT_String: {
835 // skip this patch and don't clear it. Needs the oop array for resolved
836 // references to be created first.
837 return;
838 }
839 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
840 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
841 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
842 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
843 patch_prim:
844 {
845 jvalue value;
846 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
847 guarantee_property(value_type == patch_type,
848 "Illegal primitive patch at %d in class file %s",
849 index, CHECK);
850 switch (value_type) {
851 case T_INT: cp->int_at_put(index, value.i); break;
852 case T_FLOAT: cp->float_at_put(index, value.f); break;
853 case T_LONG: cp->long_at_put(index, value.j); break;
854 case T_DOUBLE: cp->double_at_put(index, value.d); break;
855 default: assert(false, "");
856 }
857 } // end patch_prim label
858 break;
859
860 default: {
861 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
862 guarantee_property(!has_cp_patch_at(index),
863 "Illegal unexpected patch at %d in class file %s",
864 index, CHECK);
865 return;
866 }
867 } // end of switch(tag)
868
869 // On fall-through, mark the patch as used.
870 clear_cp_patch_at(index);
871 }
872 class NameSigHash: public ResourceObj {
873 public:
874 const Symbol* _name; // name
875 const Symbol* _sig; // signature
876 NameSigHash* _next; // Next entry in hash table
877 };
878
879 static const int HASH_ROW_SIZE = 256;
880
881 static unsigned int hash(const Symbol* name, const Symbol* sig) {
882 unsigned int raw_hash = 0;
883 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
884 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
885
886 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
887 }
888
889
890 static void initialize_hashtable(NameSigHash** table) {
891 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
892 }
893 // Return false if the name/sig combination is found in table.
894 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
895 // The old format checker uses heap sort to find duplicates.
896 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
897 // of table since we don't expect Symbol*'s to move.
898 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
899 assert(name != NULL, "name in constant pool is NULL");
900
901 // First lookup for duplicates
902 int index = hash(name, sig);
903 NameSigHash* entry = table[index];
904 while (entry != NULL) {
905 if (entry->_name == name && entry->_sig == sig) {
906 return false;
907 }
908 entry = entry->_next;
909 }
910
911 // No duplicate is found, allocate a new entry and fill it.
912 entry = new NameSigHash();
913 entry->_name = name;
914 entry->_sig = sig;
915
916 // Insert into hash table
917 entry->_next = table[index];
918 table[index] = entry;
919
920 return true;
921 }
922
923 // Side-effects: populates the _local_interfaces field
924 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
925 const int itfs_len,
926 ConstantPool* const cp,
927 bool* const has_nonstatic_concrete_methods,
928 TRAPS) {
929 assert(stream != NULL, "invariant");
930 assert(cp != NULL, "invariant");
931 assert(has_nonstatic_concrete_methods != NULL, "invariant");
932
933 if (itfs_len == 0) {
934 _local_interfaces = Universe::the_empty_instance_klass_array();
935 } else {
936 assert(itfs_len > 0, "only called for len>0");
937 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
938
939 int index;
940 for (index = 0; index < itfs_len; index++) {
941 const u2 interface_index = stream->get_u2(CHECK);
942 Klass* interf;
943 check_property(
944 valid_klass_reference_at(interface_index),
945 "Interface name has bad constant pool index %u in class file %s",
946 interface_index, CHECK);
947 if (cp->tag_at(interface_index).is_klass()) {
948 interf = cp->resolved_klass_at(interface_index);
949 } else {
950 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
951
952 // Don't need to check legal name because it's checked when parsing constant pool.
953 // But need to make sure it's not an array type.
954 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
955 "Bad interface name in class file %s", CHECK);
956
957 // Call resolve_super so classcircularity is checked
958 interf = SystemDictionary::resolve_super_or_fail(
959 _class_name,
960 unresolved_klass,
961 Handle(THREAD, _loader_data->class_loader()),
962 _protection_domain,
963 false,
964 CHECK);
965 }
966
967 if (!interf->is_interface()) {
968 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
969 err_msg("class %s can not implement %s, because it is not an interface (%s)",
970 _class_name->as_klass_external_name(),
971 interf->external_name(),
972 interf->class_in_module_of_loader()));
973 }
974
975 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
976 *has_nonstatic_concrete_methods = true;
977 }
978 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
979 }
980
981 if (!_need_verify || itfs_len <= 1) {
982 return;
983 }
984
985 // Check if there's any duplicates in interfaces
986 ResourceMark rm(THREAD);
987 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
988 NameSigHash*,
989 HASH_ROW_SIZE);
990 initialize_hashtable(interface_names);
991 bool dup = false;
992 const Symbol* name = NULL;
993 {
994 debug_only(NoSafepointVerifier nsv;)
995 for (index = 0; index < itfs_len; index++) {
996 const InstanceKlass* const k = _local_interfaces->at(index);
997 name = k->name();
998 // If no duplicates, add (name, NULL) in hashtable interface_names.
999 if (!put_after_lookup(name, NULL, interface_names)) {
1000 dup = true;
1001 break;
1002 }
1003 }
1004 }
1005 if (dup) {
1006 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
1007 name->as_C_string(), CHECK);
1008 }
1009 }
1010 }
1011
1012 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
1013 int constantvalue_index,
1014 int signature_index,
1015 TRAPS) const {
1016 // Make sure the constant pool entry is of a type appropriate to this field
1017 guarantee_property(
1018 (constantvalue_index > 0 &&
1019 constantvalue_index < cp->length()),
1020 "Bad initial value index %u in ConstantValue attribute in class file %s",
1021 constantvalue_index, CHECK);
1022
1023 const constantTag value_type = cp->tag_at(constantvalue_index);
1024 switch(cp->basic_type_for_signature_at(signature_index)) {
1025 case T_LONG: {
1026 guarantee_property(value_type.is_long(),
1027 "Inconsistent constant value type in class file %s",
1028 CHECK);
1029 break;
1030 }
1031 case T_FLOAT: {
1032 guarantee_property(value_type.is_float(),
1033 "Inconsistent constant value type in class file %s",
1034 CHECK);
1035 break;
1036 }
1037 case T_DOUBLE: {
1038 guarantee_property(value_type.is_double(),
1039 "Inconsistent constant value type in class file %s",
1040 CHECK);
1041 break;
1042 }
1043 case T_BYTE:
1044 case T_CHAR:
1045 case T_SHORT:
1046 case T_BOOLEAN:
1047 case T_INT: {
1048 guarantee_property(value_type.is_int(),
1049 "Inconsistent constant value type in class file %s",
1050 CHECK);
1051 break;
1052 }
1053 case T_OBJECT: {
1054 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1055 && value_type.is_string()),
1056 "Bad string initial value in class file %s",
1057 CHECK);
1058 break;
1059 }
1060 default: {
1061 classfile_parse_error("Unable to set initial value %u in class file %s",
1062 constantvalue_index,
1063 CHECK);
1064 }
1065 }
1066 }
1067
1068 class AnnotationCollector : public ResourceObj{
1069 public:
1070 enum Location { _in_field, _in_method, _in_class };
1071 enum ID {
1072 _unknown = 0,
1073 _method_CallerSensitive,
1074 _method_ForceInline,
1075 _method_DontInline,
1076 _method_InjectedProfile,
1077 _method_LambdaForm_Compiled,
1078 _method_Hidden,
1079 _method_HotSpotIntrinsicCandidate,
1080 _jdk_internal_vm_annotation_Contended,
1081 _field_Stable,
1082 _jdk_internal_vm_annotation_ReservedStackAccess,
1083 _annotation_LIMIT
1084 };
1085 const Location _location;
1086 int _annotations_present;
1087 u2 _contended_group;
1088
1089 AnnotationCollector(Location location)
1090 : _location(location), _annotations_present(0)
1091 {
1092 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1093 }
1094 // If this annotation name has an ID, report it (or _none).
1095 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1096 // Set the annotation name:
1097 void set_annotation(ID id) {
1098 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1099 _annotations_present |= nth_bit((int)id);
1100 }
1101
1102 void remove_annotation(ID id) {
1103 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1104 _annotations_present &= ~nth_bit((int)id);
1105 }
1106
1107 // Report if the annotation is present.
1108 bool has_any_annotations() const { return _annotations_present != 0; }
1109 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1110
1111 void set_contended_group(u2 group) { _contended_group = group; }
1112 u2 contended_group() const { return _contended_group; }
1113
1114 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1115
1116 void set_stable(bool stable) { set_annotation(_field_Stable); }
1117 bool is_stable() const { return has_annotation(_field_Stable); }
1118 };
1119
1120 // This class also doubles as a holder for metadata cleanup.
1121 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1122 private:
1123 ClassLoaderData* _loader_data;
1124 AnnotationArray* _field_annotations;
1125 AnnotationArray* _field_type_annotations;
1126 public:
1127 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1128 AnnotationCollector(_in_field),
1129 _loader_data(loader_data),
1130 _field_annotations(NULL),
1131 _field_type_annotations(NULL) {}
1132 ~FieldAnnotationCollector();
1133 void apply_to(FieldInfo* f);
1134 AnnotationArray* field_annotations() { return _field_annotations; }
1135 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1136
1137 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1138 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1139 };
1140
1141 class MethodAnnotationCollector : public AnnotationCollector{
1142 public:
1143 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1144 void apply_to(const methodHandle& m);
1145 };
1146
1147 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1148 public:
1149 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1150 void apply_to(InstanceKlass* ik);
1151 };
1152
1153
1154 static int skip_annotation_value(const u1*, int, int); // fwd decl
1155
1156 // Safely increment index by val if does not pass limit
1157 #define SAFE_ADD(index, limit, val) \
1158 if (index >= limit - val) return limit; \
1159 index += val;
1160
1161 // Skip an annotation. Return >=limit if there is any problem.
1162 static int skip_annotation(const u1* buffer, int limit, int index) {
1163 assert(buffer != NULL, "invariant");
1164 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1165 // value := switch (tag:u1) { ... }
1166 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1167 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1168 while (--nmem >= 0 && index < limit) {
1169 SAFE_ADD(index, limit, 2); // skip member
1170 index = skip_annotation_value(buffer, limit, index);
1171 }
1172 return index;
1173 }
1174
1175 // Skip an annotation value. Return >=limit if there is any problem.
1176 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1177 assert(buffer != NULL, "invariant");
1178
1179 // value := switch (tag:u1) {
1180 // case B, C, I, S, Z, D, F, J, c: con:u2;
1181 // case e: e_class:u2 e_name:u2;
1182 // case s: s_con:u2;
1183 // case [: do(nval:u2) {value};
1184 // case @: annotation;
1185 // case s: s_con:u2;
1186 // }
1187 SAFE_ADD(index, limit, 1); // read tag
1188 const u1 tag = buffer[index - 1];
1189 switch (tag) {
1190 case 'B':
1191 case 'C':
1192 case 'I':
1193 case 'S':
1194 case 'Z':
1195 case 'D':
1196 case 'F':
1197 case 'J':
1198 case 'c':
1199 case 's':
1200 SAFE_ADD(index, limit, 2); // skip con or s_con
1201 break;
1202 case 'e':
1203 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1204 break;
1205 case '[':
1206 {
1207 SAFE_ADD(index, limit, 2); // read nval
1208 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1209 while (--nval >= 0 && index < limit) {
1210 index = skip_annotation_value(buffer, limit, index);
1211 }
1212 }
1213 break;
1214 case '@':
1215 index = skip_annotation(buffer, limit, index);
1216 break;
1217 default:
1218 return limit; // bad tag byte
1219 }
1220 return index;
1221 }
1222
1223 // Sift through annotations, looking for those significant to the VM:
1224 static void parse_annotations(const ConstantPool* const cp,
1225 const u1* buffer, int limit,
1226 AnnotationCollector* coll,
1227 ClassLoaderData* loader_data,
1228 TRAPS) {
1229
1230 assert(cp != NULL, "invariant");
1231 assert(buffer != NULL, "invariant");
1232 assert(coll != NULL, "invariant");
1233 assert(loader_data != NULL, "invariant");
1234
1235 // annotations := do(nann:u2) {annotation}
1236 int index = 2; // read nann
1237 if (index >= limit) return;
1238 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1239 enum { // initial annotation layout
1240 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1241 count_off = 2, // u2 such as 1 (one value)
1242 member_off = 4, // utf8 such as 'value'
1243 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1244 e_tag_val = 'e',
1245 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1246 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1247 e_size = 11, // end of 'e' annotation
1248 c_tag_val = 'c', // payload is type
1249 c_con_off = 7, // utf8 payload, such as 'I'
1250 c_size = 9, // end of 'c' annotation
1251 s_tag_val = 's', // payload is String
1252 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1253 s_size = 9,
1254 min_size = 6 // smallest possible size (zero members)
1255 };
1256 // Cannot add min_size to index in case of overflow MAX_INT
1257 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1258 int index0 = index;
1259 index = skip_annotation(buffer, limit, index);
1260 const u1* const abase = buffer + index0;
1261 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1262 const int count = Bytes::get_Java_u2((address)abase + count_off);
1263 const Symbol* const aname = check_symbol_at(cp, atype);
1264 if (aname == NULL) break; // invalid annotation name
1265 const Symbol* member = NULL;
1266 if (count >= 1) {
1267 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1268 member = check_symbol_at(cp, member_index);
1269 if (member == NULL) break; // invalid member name
1270 }
1271
1272 // Here is where parsing particular annotations will take place.
1273 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1274 if (AnnotationCollector::_unknown == id) continue;
1275 coll->set_annotation(id);
1276
1277 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1278 // @Contended can optionally specify the contention group.
1279 //
1280 // Contended group defines the equivalence class over the fields:
1281 // the fields within the same contended group are not treated distinct.
1282 // The only exception is default group, which does not incur the
1283 // equivalence. Naturally, contention group for classes is meaningless.
1284 //
1285 // While the contention group is specified as String, annotation
1286 // values are already interned, and we might as well use the constant
1287 // pool index as the group tag.
1288 //
1289 u2 group_index = 0; // default contended group
1290 if (count == 1
1291 && s_size == (index - index0) // match size
1292 && s_tag_val == *(abase + tag_off)
1293 && member == vmSymbols::value_name()) {
1294 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1295 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1296 group_index = 0; // default contended group
1297 }
1298 }
1299 coll->set_contended_group(group_index);
1300 }
1301 }
1302 }
1303
1304
1305 // Parse attributes for a field.
1306 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1307 u2 attributes_count,
1308 bool is_static, u2 signature_index,
1309 u2* const constantvalue_index_addr,
1310 bool* const is_synthetic_addr,
1311 u2* const generic_signature_index_addr,
1312 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1313 TRAPS) {
1314 assert(cfs != NULL, "invariant");
1315 assert(constantvalue_index_addr != NULL, "invariant");
1316 assert(is_synthetic_addr != NULL, "invariant");
1317 assert(generic_signature_index_addr != NULL, "invariant");
1318 assert(parsed_annotations != NULL, "invariant");
1319 assert(attributes_count > 0, "attributes_count should be greater than 0");
1320
1321 u2 constantvalue_index = 0;
1322 u2 generic_signature_index = 0;
1323 bool is_synthetic = false;
1324 const u1* runtime_visible_annotations = NULL;
1325 int runtime_visible_annotations_length = 0;
1326 const u1* runtime_invisible_annotations = NULL;
1327 int runtime_invisible_annotations_length = 0;
1328 const u1* runtime_visible_type_annotations = NULL;
1329 int runtime_visible_type_annotations_length = 0;
1330 const u1* runtime_invisible_type_annotations = NULL;
1331 int runtime_invisible_type_annotations_length = 0;
1332 bool runtime_invisible_annotations_exists = false;
1333 bool runtime_invisible_type_annotations_exists = false;
1334 const ConstantPool* const cp = _cp;
1335
1336 while (attributes_count--) {
1337 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1338 const u2 attribute_name_index = cfs->get_u2_fast();
1339 const u4 attribute_length = cfs->get_u4_fast();
1340 check_property(valid_symbol_at(attribute_name_index),
1341 "Invalid field attribute index %u in class file %s",
1342 attribute_name_index,
1343 CHECK);
1344
1345 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1346 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1347 // ignore if non-static
1348 if (constantvalue_index != 0) {
1349 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1350 }
1351 check_property(
1352 attribute_length == 2,
1353 "Invalid ConstantValue field attribute length %u in class file %s",
1354 attribute_length, CHECK);
1355
1356 constantvalue_index = cfs->get_u2(CHECK);
1357 if (_need_verify) {
1358 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1359 }
1360 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1361 if (attribute_length != 0) {
1362 classfile_parse_error(
1363 "Invalid Synthetic field attribute length %u in class file %s",
1364 attribute_length, CHECK);
1365 }
1366 is_synthetic = true;
1367 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1368 if (attribute_length != 0) {
1369 classfile_parse_error(
1370 "Invalid Deprecated field attribute length %u in class file %s",
1371 attribute_length, CHECK);
1372 }
1373 } else if (_major_version >= JAVA_1_5_VERSION) {
1374 if (attribute_name == vmSymbols::tag_signature()) {
1375 if (generic_signature_index != 0) {
1376 classfile_parse_error(
1377 "Multiple Signature attributes for field in class file %s", CHECK);
1378 }
1379 if (attribute_length != 2) {
1380 classfile_parse_error(
1381 "Wrong size %u for field's Signature attribute in class file %s",
1382 attribute_length, CHECK);
1383 }
1384 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1385 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1386 if (runtime_visible_annotations != NULL) {
1387 classfile_parse_error(
1388 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1389 }
1390 runtime_visible_annotations_length = attribute_length;
1391 runtime_visible_annotations = cfs->current();
1392 assert(runtime_visible_annotations != NULL, "null visible annotations");
1393 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1394 parse_annotations(cp,
1395 runtime_visible_annotations,
1396 runtime_visible_annotations_length,
1397 parsed_annotations,
1398 _loader_data,
1399 CHECK);
1400 cfs->skip_u1_fast(runtime_visible_annotations_length);
1401 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1402 if (runtime_invisible_annotations_exists) {
1403 classfile_parse_error(
1404 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1405 }
1406 runtime_invisible_annotations_exists = true;
1407 if (PreserveAllAnnotations) {
1408 runtime_invisible_annotations_length = attribute_length;
1409 runtime_invisible_annotations = cfs->current();
1410 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1411 }
1412 cfs->skip_u1(attribute_length, CHECK);
1413 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1414 if (runtime_visible_type_annotations != NULL) {
1415 classfile_parse_error(
1416 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1417 }
1418 runtime_visible_type_annotations_length = attribute_length;
1419 runtime_visible_type_annotations = cfs->current();
1420 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1421 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1422 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1423 if (runtime_invisible_type_annotations_exists) {
1424 classfile_parse_error(
1425 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1426 } else {
1427 runtime_invisible_type_annotations_exists = true;
1428 }
1429 if (PreserveAllAnnotations) {
1430 runtime_invisible_type_annotations_length = attribute_length;
1431 runtime_invisible_type_annotations = cfs->current();
1432 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1433 }
1434 cfs->skip_u1(attribute_length, CHECK);
1435 } else {
1436 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1437 }
1438 } else {
1439 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1440 }
1441 }
1442
1443 *constantvalue_index_addr = constantvalue_index;
1444 *is_synthetic_addr = is_synthetic;
1445 *generic_signature_index_addr = generic_signature_index;
1446 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1447 runtime_visible_annotations_length,
1448 runtime_invisible_annotations,
1449 runtime_invisible_annotations_length,
1450 CHECK);
1451 parsed_annotations->set_field_annotations(a);
1452 a = assemble_annotations(runtime_visible_type_annotations,
1453 runtime_visible_type_annotations_length,
1454 runtime_invisible_type_annotations,
1455 runtime_invisible_type_annotations_length,
1456 CHECK);
1457 parsed_annotations->set_field_type_annotations(a);
1458 return;
1459 }
1460
1461
1462 // Field allocation types. Used for computing field offsets.
1463
1464 enum FieldAllocationType {
1465 STATIC_OOP, // Oops
1466 STATIC_BYTE, // Boolean, Byte, char
1467 STATIC_SHORT, // shorts
1468 STATIC_WORD, // ints
1469 STATIC_DOUBLE, // aligned long or double
1470 NONSTATIC_OOP,
1471 NONSTATIC_BYTE,
1472 NONSTATIC_SHORT,
1473 NONSTATIC_WORD,
1474 NONSTATIC_DOUBLE,
1475 MAX_FIELD_ALLOCATION_TYPE,
1476 BAD_ALLOCATION_TYPE = -1
1477 };
1478
1479 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1480 BAD_ALLOCATION_TYPE, // 0
1481 BAD_ALLOCATION_TYPE, // 1
1482 BAD_ALLOCATION_TYPE, // 2
1483 BAD_ALLOCATION_TYPE, // 3
1484 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1485 NONSTATIC_SHORT, // T_CHAR = 5,
1486 NONSTATIC_WORD, // T_FLOAT = 6,
1487 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1488 NONSTATIC_BYTE, // T_BYTE = 8,
1489 NONSTATIC_SHORT, // T_SHORT = 9,
1490 NONSTATIC_WORD, // T_INT = 10,
1491 NONSTATIC_DOUBLE, // T_LONG = 11,
1492 NONSTATIC_OOP, // T_OBJECT = 12,
1493 NONSTATIC_OOP, // T_ARRAY = 13,
1494 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1495 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1496 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1497 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1498 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1499 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1500 BAD_ALLOCATION_TYPE, // 0
1501 BAD_ALLOCATION_TYPE, // 1
1502 BAD_ALLOCATION_TYPE, // 2
1503 BAD_ALLOCATION_TYPE, // 3
1504 STATIC_BYTE , // T_BOOLEAN = 4,
1505 STATIC_SHORT, // T_CHAR = 5,
1506 STATIC_WORD, // T_FLOAT = 6,
1507 STATIC_DOUBLE, // T_DOUBLE = 7,
1508 STATIC_BYTE, // T_BYTE = 8,
1509 STATIC_SHORT, // T_SHORT = 9,
1510 STATIC_WORD, // T_INT = 10,
1511 STATIC_DOUBLE, // T_LONG = 11,
1512 STATIC_OOP, // T_OBJECT = 12,
1513 STATIC_OOP, // T_ARRAY = 13,
1514 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1515 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1516 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1517 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1518 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1519 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1520 };
1521
1522 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1523 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1524 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1525 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1526 return result;
1527 }
1528
1529 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1530 public:
1531 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1532
1533 FieldAllocationCount() {
1534 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1535 count[i] = 0;
1536 }
1537 }
1538
1539 FieldAllocationType update(bool is_static, BasicType type) {
1540 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1541 if (atype != BAD_ALLOCATION_TYPE) {
1542 // Make sure there is no overflow with injected fields.
1543 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1544 count[atype]++;
1545 }
1546 return atype;
1547 }
1548 };
1549
1550 // Side-effects: populates the _fields, _fields_annotations,
1551 // _fields_type_annotations fields
1552 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1553 bool is_interface,
1554 FieldAllocationCount* const fac,
1555 ConstantPool* cp,
1556 const int cp_size,
1557 u2* const java_fields_count_ptr,
1558 TRAPS) {
1559
1560 assert(cfs != NULL, "invariant");
1561 assert(fac != NULL, "invariant");
1562 assert(cp != NULL, "invariant");
1563 assert(java_fields_count_ptr != NULL, "invariant");
1564
1565 assert(NULL == _fields, "invariant");
1566 assert(NULL == _fields_annotations, "invariant");
1567 assert(NULL == _fields_type_annotations, "invariant");
1568
1569 cfs->guarantee_more(2, CHECK); // length
1570 const u2 length = cfs->get_u2_fast();
1571 *java_fields_count_ptr = length;
1572
1573 int num_injected = 0;
1574 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1575 &num_injected);
1576 const int total_fields = length + num_injected;
1577
1578 // The field array starts with tuples of shorts
1579 // [access, name index, sig index, initial value index, byte offset].
1580 // A generic signature slot only exists for field with generic
1581 // signature attribute. And the access flag is set with
1582 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1583 // signature slots are at the end of the field array and after all
1584 // other fields data.
1585 //
1586 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1587 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1588 // ...
1589 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1590 // [generic signature index]
1591 // [generic signature index]
1592 // ...
1593 //
1594 // Allocate a temporary resource array for field data. For each field,
1595 // a slot is reserved in the temporary array for the generic signature
1596 // index. After parsing all fields, the data are copied to a permanent
1597 // array and any unused slots will be discarded.
1598 ResourceMark rm(THREAD);
1599 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1600 u2,
1601 total_fields * (FieldInfo::field_slots + 1));
1602
1603 // The generic signature slots start after all other fields' data.
1604 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1605 int num_generic_signature = 0;
1606 for (int n = 0; n < length; n++) {
1607 // access_flags, name_index, descriptor_index, attributes_count
1608 cfs->guarantee_more(8, CHECK);
1609
1610 AccessFlags access_flags;
1611 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1612 verify_legal_field_modifiers(flags, is_interface, CHECK);
1613 access_flags.set_flags(flags);
1614
1615 const u2 name_index = cfs->get_u2_fast();
1616 check_property(valid_symbol_at(name_index),
1617 "Invalid constant pool index %u for field name in class file %s",
1618 name_index, CHECK);
1619 const Symbol* const name = cp->symbol_at(name_index);
1620 verify_legal_field_name(name, CHECK);
1621
1622 const u2 signature_index = cfs->get_u2_fast();
1623 check_property(valid_symbol_at(signature_index),
1624 "Invalid constant pool index %u for field signature in class file %s",
1625 signature_index, CHECK);
1626 const Symbol* const sig = cp->symbol_at(signature_index);
1627 verify_legal_field_signature(name, sig, CHECK);
1628
1629 u2 constantvalue_index = 0;
1630 bool is_synthetic = false;
1631 u2 generic_signature_index = 0;
1632 const bool is_static = access_flags.is_static();
1633 FieldAnnotationCollector parsed_annotations(_loader_data);
1634
1635 const u2 attributes_count = cfs->get_u2_fast();
1636 if (attributes_count > 0) {
1637 parse_field_attributes(cfs,
1638 attributes_count,
1639 is_static,
1640 signature_index,
1641 &constantvalue_index,
1642 &is_synthetic,
1643 &generic_signature_index,
1644 &parsed_annotations,
1645 CHECK);
1646
1647 if (parsed_annotations.field_annotations() != NULL) {
1648 if (_fields_annotations == NULL) {
1649 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1650 _loader_data, length, NULL,
1651 CHECK);
1652 }
1653 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1654 parsed_annotations.set_field_annotations(NULL);
1655 }
1656 if (parsed_annotations.field_type_annotations() != NULL) {
1657 if (_fields_type_annotations == NULL) {
1658 _fields_type_annotations =
1659 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1660 length,
1661 NULL,
1662 CHECK);
1663 }
1664 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1665 parsed_annotations.set_field_type_annotations(NULL);
1666 }
1667
1668 if (is_synthetic) {
1669 access_flags.set_is_synthetic();
1670 }
1671 if (generic_signature_index != 0) {
1672 access_flags.set_field_has_generic_signature();
1673 fa[generic_signature_slot] = generic_signature_index;
1674 generic_signature_slot ++;
1675 num_generic_signature ++;
1676 }
1677 }
1678
1679 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1680 field->initialize(access_flags.as_short(),
1681 name_index,
1682 signature_index,
1683 constantvalue_index);
1684 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1685
1686 // Remember how many oops we encountered and compute allocation type
1687 const FieldAllocationType atype = fac->update(is_static, type);
1688 field->set_allocation_type(atype);
1689
1690 // After field is initialized with type, we can augment it with aux info
1691 if (parsed_annotations.has_any_annotations()) {
1692 parsed_annotations.apply_to(field);
1693 if (field->is_contended()) {
1694 _has_contended_fields = true;
1695 }
1696 }
1697 }
1698
1699 int index = length;
1700 if (num_injected != 0) {
1701 for (int n = 0; n < num_injected; n++) {
1702 // Check for duplicates
1703 if (injected[n].may_be_java) {
1704 const Symbol* const name = injected[n].name();
1705 const Symbol* const signature = injected[n].signature();
1706 bool duplicate = false;
1707 for (int i = 0; i < length; i++) {
1708 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1709 if (name == cp->symbol_at(f->name_index()) &&
1710 signature == cp->symbol_at(f->signature_index())) {
1711 // Symbol is desclared in Java so skip this one
1712 duplicate = true;
1713 break;
1714 }
1715 }
1716 if (duplicate) {
1717 // These will be removed from the field array at the end
1718 continue;
1719 }
1720 }
1721
1722 // Injected field
1723 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1724 field->initialize(JVM_ACC_FIELD_INTERNAL,
1725 injected[n].name_index,
1726 injected[n].signature_index,
1727 0);
1728
1729 const BasicType type = Signature::basic_type(injected[n].signature());
1730
1731 // Remember how many oops we encountered and compute allocation type
1732 const FieldAllocationType atype = fac->update(false, type);
1733 field->set_allocation_type(atype);
1734 index++;
1735 }
1736 }
1737
1738 assert(NULL == _fields, "invariant");
1739
1740 _fields =
1741 MetadataFactory::new_array<u2>(_loader_data,
1742 index * FieldInfo::field_slots + num_generic_signature,
1743 CHECK);
1744 // Sometimes injected fields already exist in the Java source so
1745 // the fields array could be too long. In that case the
1746 // fields array is trimed. Also unused slots that were reserved
1747 // for generic signature indexes are discarded.
1748 {
1749 int i = 0;
1750 for (; i < index * FieldInfo::field_slots; i++) {
1751 _fields->at_put(i, fa[i]);
1752 }
1753 for (int j = total_fields * FieldInfo::field_slots;
1754 j < generic_signature_slot; j++) {
1755 _fields->at_put(i++, fa[j]);
1756 }
1757 assert(_fields->length() == i, "");
1758 }
1759
1760 if (_need_verify && length > 1) {
1761 // Check duplicated fields
1762 ResourceMark rm(THREAD);
1763 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1764 THREAD, NameSigHash*, HASH_ROW_SIZE);
1765 initialize_hashtable(names_and_sigs);
1766 bool dup = false;
1767 const Symbol* name = NULL;
1768 const Symbol* sig = NULL;
1769 {
1770 debug_only(NoSafepointVerifier nsv;)
1771 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1772 name = fs.name();
1773 sig = fs.signature();
1774 // If no duplicates, add name/signature in hashtable names_and_sigs.
1775 if (!put_after_lookup(name, sig, names_and_sigs)) {
1776 dup = true;
1777 break;
1778 }
1779 }
1780 }
1781 if (dup) {
1782 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1783 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1784 }
1785 }
1786 }
1787
1788
1789 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1790 u4 code_length,
1791 u4 exception_table_length,
1792 TRAPS) {
1793 assert(cfs != NULL, "invariant");
1794
1795 const unsafe_u2* const exception_table_start = cfs->current();
1796 assert(exception_table_start != NULL, "null exception table");
1797
1798 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1799 // end_pc,
1800 // handler_pc,
1801 // catch_type_index
1802
1803 // Will check legal target after parsing code array in verifier.
1804 if (_need_verify) {
1805 for (unsigned int i = 0; i < exception_table_length; i++) {
1806 const u2 start_pc = cfs->get_u2_fast();
1807 const u2 end_pc = cfs->get_u2_fast();
1808 const u2 handler_pc = cfs->get_u2_fast();
1809 const u2 catch_type_index = cfs->get_u2_fast();
1810 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1811 "Illegal exception table range in class file %s",
1812 CHECK_NULL);
1813 guarantee_property(handler_pc < code_length,
1814 "Illegal exception table handler in class file %s",
1815 CHECK_NULL);
1816 if (catch_type_index != 0) {
1817 guarantee_property(valid_klass_reference_at(catch_type_index),
1818 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1819 }
1820 }
1821 } else {
1822 cfs->skip_u2_fast(exception_table_length * 4);
1823 }
1824 return exception_table_start;
1825 }
1826
1827 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1828 u4 code_length,
1829 CompressedLineNumberWriteStream**const write_stream,
1830 TRAPS) {
1831
1832 const ClassFileStream* const cfs = _stream;
1833 unsigned int num_entries = cfs->get_u2(CHECK);
1834
1835 // Each entry is a u2 start_pc, and a u2 line_number
1836 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1837
1838 // Verify line number attribute and table length
1839 check_property(
1840 code_attribute_length == sizeof(u2) + length_in_bytes,
1841 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1842
1843 cfs->guarantee_more(length_in_bytes, CHECK);
1844
1845 if ((*write_stream) == NULL) {
1846 if (length_in_bytes > fixed_buffer_size) {
1847 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1848 } else {
1849 (*write_stream) = new CompressedLineNumberWriteStream(
1850 _linenumbertable_buffer, fixed_buffer_size);
1851 }
1852 }
1853
1854 while (num_entries-- > 0) {
1855 const u2 bci = cfs->get_u2_fast(); // start_pc
1856 const u2 line = cfs->get_u2_fast(); // line_number
1857 guarantee_property(bci < code_length,
1858 "Invalid pc in LineNumberTable in class file %s", CHECK);
1859 (*write_stream)->write_pair(bci, line);
1860 }
1861 }
1862
1863
1864 class LVT_Hash : public AllStatic {
1865 public:
1866
1867 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1868 /*
1869 * 3-tuple start_bci/length/slot has to be unique key,
1870 * so the following comparison seems to be redundant:
1871 * && elem->name_cp_index == entry->_elem->name_cp_index
1872 */
1873 return (e0.start_bci == e1.start_bci &&
1874 e0.length == e1.length &&
1875 e0.name_cp_index == e1.name_cp_index &&
1876 e0.slot == e1.slot);
1877 }
1878
1879 static unsigned int hash(LocalVariableTableElement const& e0) {
1880 unsigned int raw_hash = e0.start_bci;
1881
1882 raw_hash = e0.length + raw_hash * 37;
1883 raw_hash = e0.name_cp_index + raw_hash * 37;
1884 raw_hash = e0.slot + raw_hash * 37;
1885
1886 return raw_hash;
1887 }
1888 };
1889
1890
1891 // Class file LocalVariableTable elements.
1892 class Classfile_LVT_Element {
1893 public:
1894 u2 start_bci;
1895 u2 length;
1896 u2 name_cp_index;
1897 u2 descriptor_cp_index;
1898 u2 slot;
1899 };
1900
1901 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1902 LocalVariableTableElement* const lvt) {
1903 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1904 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1905 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1906 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1907 lvt->signature_cp_index = 0;
1908 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1909 }
1910
1911 // Function is used to parse both attributes:
1912 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1913 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1914 u4 code_length,
1915 u2 max_locals,
1916 u4 code_attribute_length,
1917 u2* const localvariable_table_length,
1918 bool isLVTT,
1919 TRAPS) {
1920 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1921 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1922 const unsigned int size =
1923 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1924
1925 const ConstantPool* const cp = _cp;
1926
1927 // Verify local variable table attribute has right length
1928 if (_need_verify) {
1929 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1930 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1931 }
1932
1933 const unsafe_u2* const localvariable_table_start = cfs->current();
1934 assert(localvariable_table_start != NULL, "null local variable table");
1935 if (!_need_verify) {
1936 cfs->skip_u2_fast(size);
1937 } else {
1938 cfs->guarantee_more(size * 2, CHECK_NULL);
1939 for(int i = 0; i < (*localvariable_table_length); i++) {
1940 const u2 start_pc = cfs->get_u2_fast();
1941 const u2 length = cfs->get_u2_fast();
1942 const u2 name_index = cfs->get_u2_fast();
1943 const u2 descriptor_index = cfs->get_u2_fast();
1944 const u2 index = cfs->get_u2_fast();
1945 // Assign to a u4 to avoid overflow
1946 const u4 end_pc = (u4)start_pc + (u4)length;
1947
1948 if (start_pc >= code_length) {
1949 classfile_parse_error(
1950 "Invalid start_pc %u in %s in class file %s",
1951 start_pc, tbl_name, CHECK_NULL);
1952 }
1953 if (end_pc > code_length) {
1954 classfile_parse_error(
1955 "Invalid length %u in %s in class file %s",
1956 length, tbl_name, CHECK_NULL);
1957 }
1958 const int cp_size = cp->length();
1959 guarantee_property(valid_symbol_at(name_index),
1960 "Name index %u in %s has bad constant type in class file %s",
1961 name_index, tbl_name, CHECK_NULL);
1962 guarantee_property(valid_symbol_at(descriptor_index),
1963 "Signature index %u in %s has bad constant type in class file %s",
1964 descriptor_index, tbl_name, CHECK_NULL);
1965
1966 const Symbol* const name = cp->symbol_at(name_index);
1967 const Symbol* const sig = cp->symbol_at(descriptor_index);
1968 verify_legal_field_name(name, CHECK_NULL);
1969 u2 extra_slot = 0;
1970 if (!isLVTT) {
1971 verify_legal_field_signature(name, sig, CHECK_NULL);
1972
1973 // 4894874: check special cases for double and long local variables
1974 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1975 sig == vmSymbols::type_signature(T_LONG)) {
1976 extra_slot = 1;
1977 }
1978 }
1979 guarantee_property((index + extra_slot) < max_locals,
1980 "Invalid index %u in %s in class file %s",
1981 index, tbl_name, CHECK_NULL);
1982 }
1983 }
1984 return localvariable_table_start;
1985 }
1986
1987 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1988 u4 code_attribute_length,
1989 bool need_verify,
1990 TRAPS) {
1991 assert(cfs != NULL, "invariant");
1992
1993 if (0 == code_attribute_length) {
1994 return NULL;
1995 }
1996
1997 const u1* const stackmap_table_start = cfs->current();
1998 assert(stackmap_table_start != NULL, "null stackmap table");
1999
2000 // check code_attribute_length first
2001 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2002
2003 if (!need_verify && !DumpSharedSpaces) {
2004 return NULL;
2005 }
2006 return stackmap_table_start;
2007 }
2008
2009 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2010 u2* const checked_exceptions_length,
2011 u4 method_attribute_length,
2012 TRAPS) {
2013 assert(cfs != NULL, "invariant");
2014 assert(checked_exceptions_length != NULL, "invariant");
2015
2016 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2017 *checked_exceptions_length = cfs->get_u2_fast();
2018 const unsigned int size =
2019 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2020 const unsafe_u2* const checked_exceptions_start = cfs->current();
2021 assert(checked_exceptions_start != NULL, "null checked exceptions");
2022 if (!_need_verify) {
2023 cfs->skip_u2_fast(size);
2024 } else {
2025 // Verify each value in the checked exception table
2026 u2 checked_exception;
2027 const u2 len = *checked_exceptions_length;
2028 cfs->guarantee_more(2 * len, CHECK_NULL);
2029 for (int i = 0; i < len; i++) {
2030 checked_exception = cfs->get_u2_fast();
2031 check_property(
2032 valid_klass_reference_at(checked_exception),
2033 "Exception name has bad type at constant pool %u in class file %s",
2034 checked_exception, CHECK_NULL);
2035 }
2036 }
2037 // check exceptions attribute length
2038 if (_need_verify) {
2039 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2040 sizeof(u2) * size),
2041 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2042 }
2043 return checked_exceptions_start;
2044 }
2045
2046 void ClassFileParser::throwIllegalSignature(const char* type,
2047 const Symbol* name,
2048 const Symbol* sig,
2049 TRAPS) const {
2050 assert(name != NULL, "invariant");
2051 assert(sig != NULL, "invariant");
2052
2053 ResourceMark rm(THREAD);
2054 Exceptions::fthrow(THREAD_AND_LOCATION,
2055 vmSymbols::java_lang_ClassFormatError(),
2056 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2057 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2058 }
2059
2060 AnnotationCollector::ID
2061 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2062 const Symbol* name) {
2063 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2064 // Privileged code can use all annotations. Other code silently drops some.
2065 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2066 loader_data->is_platform_class_loader_data() ||
2067 loader_data->is_unsafe_anonymous();
2068 switch (sid) {
2069 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2070 if (_location != _in_method) break; // only allow for methods
2071 if (!privileged) break; // only allow in privileged code
2072 return _method_CallerSensitive;
2073 }
2074 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2075 if (_location != _in_method) break; // only allow for methods
2076 if (!privileged) break; // only allow in privileged code
2077 return _method_ForceInline;
2078 }
2079 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2080 if (_location != _in_method) break; // only allow for methods
2081 if (!privileged) break; // only allow in privileged code
2082 return _method_DontInline;
2083 }
2084 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2085 if (_location != _in_method) break; // only allow for methods
2086 if (!privileged) break; // only allow in privileged code
2087 return _method_InjectedProfile;
2088 }
2089 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2090 if (_location != _in_method) break; // only allow for methods
2091 if (!privileged) break; // only allow in privileged code
2092 return _method_LambdaForm_Compiled;
2093 }
2094 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
2095 if (_location != _in_method) break; // only allow for methods
2096 if (!privileged) break; // only allow in privileged code
2097 return _method_Hidden;
2098 }
2099 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2100 if (_location != _in_method) break; // only allow for methods
2101 if (!privileged) break; // only allow in privileged code
2102 return _method_HotSpotIntrinsicCandidate;
2103 }
2104 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2105 if (_location != _in_field) break; // only allow for fields
2106 if (!privileged) break; // only allow in privileged code
2107 return _field_Stable;
2108 }
2109 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2110 if (_location != _in_field && _location != _in_class) {
2111 break; // only allow for fields and classes
2112 }
2113 if (!EnableContended || (RestrictContended && !privileged)) {
2114 break; // honor privileges
2115 }
2116 return _jdk_internal_vm_annotation_Contended;
2117 }
2118 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2119 if (_location != _in_method) break; // only allow for methods
2120 if (RestrictReservedStack && !privileged) break; // honor privileges
2121 return _jdk_internal_vm_annotation_ReservedStackAccess;
2122 }
2123 default: {
2124 break;
2125 }
2126 }
2127 return AnnotationCollector::_unknown;
2128 }
2129
2130 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2131 if (is_contended())
2132 f->set_contended_group(contended_group());
2133 if (is_stable())
2134 f->set_stable(true);
2135 }
2136
2137 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2138 // If there's an error deallocate metadata for field annotations
2139 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2140 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2141 }
2142
2143 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2144 if (has_annotation(_method_CallerSensitive))
2145 m->set_caller_sensitive(true);
2146 if (has_annotation(_method_ForceInline))
2147 m->set_force_inline(true);
2148 if (has_annotation(_method_DontInline))
2149 m->set_dont_inline(true);
2150 if (has_annotation(_method_InjectedProfile))
2151 m->set_has_injected_profile(true);
2152 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2153 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2154 if (has_annotation(_method_Hidden))
2155 m->set_hidden(true);
2156 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2157 m->set_intrinsic_candidate(true);
2158 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2159 m->set_has_reserved_stack_access(true);
2160 }
2161
2162 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2163 assert(ik != NULL, "invariant");
2164 ik->set_is_contended(is_contended());
2165 }
2166
2167 #define MAX_ARGS_SIZE 255
2168 #define MAX_CODE_SIZE 65535
2169 #define INITIAL_MAX_LVT_NUMBER 256
2170
2171 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2172 *
2173 * Rules for LVT's and LVTT's are:
2174 * - There can be any number of LVT's and LVTT's.
2175 * - If there are n LVT's, it is the same as if there was just
2176 * one LVT containing all the entries from the n LVT's.
2177 * - There may be no more than one LVT entry per local variable.
2178 * Two LVT entries are 'equal' if these fields are the same:
2179 * start_pc, length, name, slot
2180 * - There may be no more than one LVTT entry per each LVT entry.
2181 * Each LVTT entry has to match some LVT entry.
2182 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2183 */
2184 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2185 int lvt_cnt,
2186 u2* const localvariable_table_length,
2187 const unsafe_u2** const localvariable_table_start,
2188 int lvtt_cnt,
2189 u2* const localvariable_type_table_length,
2190 const unsafe_u2** const localvariable_type_table_start,
2191 TRAPS) {
2192
2193 ResourceMark rm(THREAD);
2194
2195 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2196 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2197
2198 LVT_HashTable* const table = new LVT_HashTable();
2199
2200 // To fill LocalVariableTable in
2201 const Classfile_LVT_Element* cf_lvt;
2202 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2203
2204 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2205 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2206 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2207 copy_lvt_element(&cf_lvt[idx], lvt);
2208 // If no duplicates, add LVT elem in hashtable.
2209 if (table->put(*lvt, lvt) == false
2210 && _need_verify
2211 && _major_version >= JAVA_1_5_VERSION) {
2212 classfile_parse_error("Duplicated LocalVariableTable attribute "
2213 "entry for '%s' in class file %s",
2214 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2215 CHECK);
2216 }
2217 }
2218 }
2219
2220 // To merge LocalVariableTable and LocalVariableTypeTable
2221 const Classfile_LVT_Element* cf_lvtt;
2222 LocalVariableTableElement lvtt_elem;
2223
2224 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2225 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2226 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2227 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2228 LocalVariableTableElement** entry = table->get(lvtt_elem);
2229 if (entry == NULL) {
2230 if (_need_verify) {
2231 classfile_parse_error("LVTT entry for '%s' in class file %s "
2232 "does not match any LVT entry",
2233 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2234 CHECK);
2235 }
2236 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2237 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2238 "entry for '%s' in class file %s",
2239 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2240 CHECK);
2241 } else {
2242 // to add generic signatures into LocalVariableTable
2243 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2244 }
2245 }
2246 }
2247 }
2248
2249
2250 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2251 const u1* runtime_visible_annotations,
2252 int runtime_visible_annotations_length,
2253 const u1* runtime_invisible_annotations,
2254 int runtime_invisible_annotations_length,
2255 const u1* runtime_visible_parameter_annotations,
2256 int runtime_visible_parameter_annotations_length,
2257 const u1* runtime_invisible_parameter_annotations,
2258 int runtime_invisible_parameter_annotations_length,
2259 const u1* runtime_visible_type_annotations,
2260 int runtime_visible_type_annotations_length,
2261 const u1* runtime_invisible_type_annotations,
2262 int runtime_invisible_type_annotations_length,
2263 const u1* annotation_default,
2264 int annotation_default_length,
2265 TRAPS) {
2266
2267 AnnotationArray* a;
2268
2269 if (runtime_visible_annotations_length +
2270 runtime_invisible_annotations_length > 0) {
2271 a = assemble_annotations(runtime_visible_annotations,
2272 runtime_visible_annotations_length,
2273 runtime_invisible_annotations,
2274 runtime_invisible_annotations_length,
2275 CHECK);
2276 cm->set_method_annotations(a);
2277 }
2278
2279 if (runtime_visible_parameter_annotations_length +
2280 runtime_invisible_parameter_annotations_length > 0) {
2281 a = assemble_annotations(runtime_visible_parameter_annotations,
2282 runtime_visible_parameter_annotations_length,
2283 runtime_invisible_parameter_annotations,
2284 runtime_invisible_parameter_annotations_length,
2285 CHECK);
2286 cm->set_parameter_annotations(a);
2287 }
2288
2289 if (annotation_default_length > 0) {
2290 a = assemble_annotations(annotation_default,
2291 annotation_default_length,
2292 NULL,
2293 0,
2294 CHECK);
2295 cm->set_default_annotations(a);
2296 }
2297
2298 if (runtime_visible_type_annotations_length +
2299 runtime_invisible_type_annotations_length > 0) {
2300 a = assemble_annotations(runtime_visible_type_annotations,
2301 runtime_visible_type_annotations_length,
2302 runtime_invisible_type_annotations,
2303 runtime_invisible_type_annotations_length,
2304 CHECK);
2305 cm->set_type_annotations(a);
2306 }
2307 }
2308
2309
2310 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2311 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2312 // Method* to save footprint, so we only know the size of the resulting Method* when the
2313 // entire method attribute is parsed.
2314 //
2315 // The promoted_flags parameter is used to pass relevant access_flags
2316 // from the method back up to the containing klass. These flag values
2317 // are added to klass's access_flags.
2318
2319 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2320 bool is_interface,
2321 const ConstantPool* cp,
2322 AccessFlags* const promoted_flags,
2323 TRAPS) {
2324 assert(cfs != NULL, "invariant");
2325 assert(cp != NULL, "invariant");
2326 assert(promoted_flags != NULL, "invariant");
2327
2328 ResourceMark rm(THREAD);
2329 // Parse fixed parts:
2330 // access_flags, name_index, descriptor_index, attributes_count
2331 cfs->guarantee_more(8, CHECK_NULL);
2332
2333 int flags = cfs->get_u2_fast();
2334 const u2 name_index = cfs->get_u2_fast();
2335 const int cp_size = cp->length();
2336 check_property(
2337 valid_symbol_at(name_index),
2338 "Illegal constant pool index %u for method name in class file %s",
2339 name_index, CHECK_NULL);
2340 const Symbol* const name = cp->symbol_at(name_index);
2341 verify_legal_method_name(name, CHECK_NULL);
2342
2343 const u2 signature_index = cfs->get_u2_fast();
2344 guarantee_property(
2345 valid_symbol_at(signature_index),
2346 "Illegal constant pool index %u for method signature in class file %s",
2347 signature_index, CHECK_NULL);
2348 const Symbol* const signature = cp->symbol_at(signature_index);
2349
2350 if (name == vmSymbols::class_initializer_name()) {
2351 // We ignore the other access flags for a valid class initializer.
2352 // (JVM Spec 2nd ed., chapter 4.6)
2353 if (_major_version < 51) { // backward compatibility
2354 flags = JVM_ACC_STATIC;
2355 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2356 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2357 } else {
2358 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2359 }
2360 } else {
2361 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2362 }
2363
2364 if (name == vmSymbols::object_initializer_name() && is_interface) {
2365 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2366 }
2367
2368 int args_size = -1; // only used when _need_verify is true
2369 if (_need_verify) {
2370 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2371 verify_legal_method_signature(name, signature, CHECK_NULL);
2372 if (args_size > MAX_ARGS_SIZE) {
2373 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2374 }
2375 }
2376
2377 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2378
2379 // Default values for code and exceptions attribute elements
2380 u2 max_stack = 0;
2381 u2 max_locals = 0;
2382 u4 code_length = 0;
2383 const u1* code_start = 0;
2384 u2 exception_table_length = 0;
2385 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2386 Array<int>* exception_handlers = Universe::the_empty_int_array();
2387 u2 checked_exceptions_length = 0;
2388 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2389 CompressedLineNumberWriteStream* linenumber_table = NULL;
2390 int linenumber_table_length = 0;
2391 int total_lvt_length = 0;
2392 u2 lvt_cnt = 0;
2393 u2 lvtt_cnt = 0;
2394 bool lvt_allocated = false;
2395 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2396 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2397 u2* localvariable_table_length = NULL;
2398 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2399 u2* localvariable_type_table_length = NULL;
2400 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2401 int method_parameters_length = -1;
2402 const u1* method_parameters_data = NULL;
2403 bool method_parameters_seen = false;
2404 bool parsed_code_attribute = false;
2405 bool parsed_checked_exceptions_attribute = false;
2406 bool parsed_stackmap_attribute = false;
2407 // stackmap attribute - JDK1.5
2408 const u1* stackmap_data = NULL;
2409 int stackmap_data_length = 0;
2410 u2 generic_signature_index = 0;
2411 MethodAnnotationCollector parsed_annotations;
2412 const u1* runtime_visible_annotations = NULL;
2413 int runtime_visible_annotations_length = 0;
2414 const u1* runtime_invisible_annotations = NULL;
2415 int runtime_invisible_annotations_length = 0;
2416 const u1* runtime_visible_parameter_annotations = NULL;
2417 int runtime_visible_parameter_annotations_length = 0;
2418 const u1* runtime_invisible_parameter_annotations = NULL;
2419 int runtime_invisible_parameter_annotations_length = 0;
2420 const u1* runtime_visible_type_annotations = NULL;
2421 int runtime_visible_type_annotations_length = 0;
2422 const u1* runtime_invisible_type_annotations = NULL;
2423 int runtime_invisible_type_annotations_length = 0;
2424 bool runtime_invisible_annotations_exists = false;
2425 bool runtime_invisible_type_annotations_exists = false;
2426 bool runtime_invisible_parameter_annotations_exists = false;
2427 const u1* annotation_default = NULL;
2428 int annotation_default_length = 0;
2429
2430 // Parse code and exceptions attribute
2431 u2 method_attributes_count = cfs->get_u2_fast();
2432 while (method_attributes_count--) {
2433 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2434 const u2 method_attribute_name_index = cfs->get_u2_fast();
2435 const u4 method_attribute_length = cfs->get_u4_fast();
2436 check_property(
2437 valid_symbol_at(method_attribute_name_index),
2438 "Invalid method attribute name index %u in class file %s",
2439 method_attribute_name_index, CHECK_NULL);
2440
2441 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2442 if (method_attribute_name == vmSymbols::tag_code()) {
2443 // Parse Code attribute
2444 if (_need_verify) {
2445 guarantee_property(
2446 !access_flags.is_native() && !access_flags.is_abstract(),
2447 "Code attribute in native or abstract methods in class file %s",
2448 CHECK_NULL);
2449 }
2450 if (parsed_code_attribute) {
2451 classfile_parse_error("Multiple Code attributes in class file %s",
2452 CHECK_NULL);
2453 }
2454 parsed_code_attribute = true;
2455
2456 // Stack size, locals size, and code size
2457 cfs->guarantee_more(8, CHECK_NULL);
2458 max_stack = cfs->get_u2_fast();
2459 max_locals = cfs->get_u2_fast();
2460 code_length = cfs->get_u4_fast();
2461 if (_need_verify) {
2462 guarantee_property(args_size <= max_locals,
2463 "Arguments can't fit into locals in class file %s",
2464 CHECK_NULL);
2465 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2466 "Invalid method Code length %u in class file %s",
2467 code_length, CHECK_NULL);
2468 }
2469 // Code pointer
2470 code_start = cfs->current();
2471 assert(code_start != NULL, "null code start");
2472 cfs->guarantee_more(code_length, CHECK_NULL);
2473 cfs->skip_u1_fast(code_length);
2474
2475 // Exception handler table
2476 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2477 exception_table_length = cfs->get_u2_fast();
2478 if (exception_table_length > 0) {
2479 exception_table_start = parse_exception_table(cfs,
2480 code_length,
2481 exception_table_length,
2482 CHECK_NULL);
2483 }
2484
2485 // Parse additional attributes in code attribute
2486 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2487 u2 code_attributes_count = cfs->get_u2_fast();
2488
2489 unsigned int calculated_attribute_length = 0;
2490
2491 calculated_attribute_length =
2492 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2493 calculated_attribute_length +=
2494 code_length +
2495 sizeof(exception_table_length) +
2496 sizeof(code_attributes_count) +
2497 exception_table_length *
2498 ( sizeof(u2) + // start_pc
2499 sizeof(u2) + // end_pc
2500 sizeof(u2) + // handler_pc
2501 sizeof(u2) ); // catch_type_index
2502
2503 while (code_attributes_count--) {
2504 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2505 const u2 code_attribute_name_index = cfs->get_u2_fast();
2506 const u4 code_attribute_length = cfs->get_u4_fast();
2507 calculated_attribute_length += code_attribute_length +
2508 sizeof(code_attribute_name_index) +
2509 sizeof(code_attribute_length);
2510 check_property(valid_symbol_at(code_attribute_name_index),
2511 "Invalid code attribute name index %u in class file %s",
2512 code_attribute_name_index,
2513 CHECK_NULL);
2514 if (LoadLineNumberTables &&
2515 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2516 // Parse and compress line number table
2517 parse_linenumber_table(code_attribute_length,
2518 code_length,
2519 &linenumber_table,
2520 CHECK_NULL);
2521
2522 } else if (LoadLocalVariableTables &&
2523 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2524 // Parse local variable table
2525 if (!lvt_allocated) {
2526 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2527 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2528 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2529 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2530 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2531 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2532 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2533 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2534 lvt_allocated = true;
2535 }
2536 if (lvt_cnt == max_lvt_cnt) {
2537 max_lvt_cnt <<= 1;
2538 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2539 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2540 }
2541 localvariable_table_start[lvt_cnt] =
2542 parse_localvariable_table(cfs,
2543 code_length,
2544 max_locals,
2545 code_attribute_length,
2546 &localvariable_table_length[lvt_cnt],
2547 false, // is not LVTT
2548 CHECK_NULL);
2549 total_lvt_length += localvariable_table_length[lvt_cnt];
2550 lvt_cnt++;
2551 } else if (LoadLocalVariableTypeTables &&
2552 _major_version >= JAVA_1_5_VERSION &&
2553 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2554 if (!lvt_allocated) {
2555 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2556 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2557 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2558 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2559 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2560 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2561 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2562 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2563 lvt_allocated = true;
2564 }
2565 // Parse local variable type table
2566 if (lvtt_cnt == max_lvtt_cnt) {
2567 max_lvtt_cnt <<= 1;
2568 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2569 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2570 }
2571 localvariable_type_table_start[lvtt_cnt] =
2572 parse_localvariable_table(cfs,
2573 code_length,
2574 max_locals,
2575 code_attribute_length,
2576 &localvariable_type_table_length[lvtt_cnt],
2577 true, // is LVTT
2578 CHECK_NULL);
2579 lvtt_cnt++;
2580 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2581 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2582 // Stack map is only needed by the new verifier in JDK1.5.
2583 if (parsed_stackmap_attribute) {
2584 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2585 }
2586 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2587 stackmap_data_length = code_attribute_length;
2588 parsed_stackmap_attribute = true;
2589 } else {
2590 // Skip unknown attributes
2591 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2592 }
2593 }
2594 // check method attribute length
2595 if (_need_verify) {
2596 guarantee_property(method_attribute_length == calculated_attribute_length,
2597 "Code segment has wrong length in class file %s",
2598 CHECK_NULL);
2599 }
2600 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2601 // Parse Exceptions attribute
2602 if (parsed_checked_exceptions_attribute) {
2603 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2604 CHECK_NULL);
2605 }
2606 parsed_checked_exceptions_attribute = true;
2607 checked_exceptions_start =
2608 parse_checked_exceptions(cfs,
2609 &checked_exceptions_length,
2610 method_attribute_length,
2611 CHECK_NULL);
2612 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2613 // reject multiple method parameters
2614 if (method_parameters_seen) {
2615 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2616 CHECK_NULL);
2617 }
2618 method_parameters_seen = true;
2619 method_parameters_length = cfs->get_u1_fast();
2620 const u2 real_length = (method_parameters_length * 4u) + 1u;
2621 if (method_attribute_length != real_length) {
2622 classfile_parse_error(
2623 "Invalid MethodParameters method attribute length %u in class file",
2624 method_attribute_length, CHECK_NULL);
2625 }
2626 method_parameters_data = cfs->current();
2627 cfs->skip_u2_fast(method_parameters_length);
2628 cfs->skip_u2_fast(method_parameters_length);
2629 // ignore this attribute if it cannot be reflected
2630 if (!SystemDictionary::Parameter_klass_loaded())
2631 method_parameters_length = -1;
2632 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2633 if (method_attribute_length != 0) {
2634 classfile_parse_error(
2635 "Invalid Synthetic method attribute length %u in class file %s",
2636 method_attribute_length, CHECK_NULL);
2637 }
2638 // Should we check that there hasn't already been a synthetic attribute?
2639 access_flags.set_is_synthetic();
2640 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2641 if (method_attribute_length != 0) {
2642 classfile_parse_error(
2643 "Invalid Deprecated method attribute length %u in class file %s",
2644 method_attribute_length, CHECK_NULL);
2645 }
2646 } else if (_major_version >= JAVA_1_5_VERSION) {
2647 if (method_attribute_name == vmSymbols::tag_signature()) {
2648 if (generic_signature_index != 0) {
2649 classfile_parse_error(
2650 "Multiple Signature attributes for method in class file %s",
2651 CHECK_NULL);
2652 }
2653 if (method_attribute_length != 2) {
2654 classfile_parse_error(
2655 "Invalid Signature attribute length %u in class file %s",
2656 method_attribute_length, CHECK_NULL);
2657 }
2658 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2659 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2660 if (runtime_visible_annotations != NULL) {
2661 classfile_parse_error(
2662 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2663 CHECK_NULL);
2664 }
2665 runtime_visible_annotations_length = method_attribute_length;
2666 runtime_visible_annotations = cfs->current();
2667 assert(runtime_visible_annotations != NULL, "null visible annotations");
2668 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2669 parse_annotations(cp,
2670 runtime_visible_annotations,
2671 runtime_visible_annotations_length,
2672 &parsed_annotations,
2673 _loader_data,
2674 CHECK_NULL);
2675 cfs->skip_u1_fast(runtime_visible_annotations_length);
2676 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2677 if (runtime_invisible_annotations_exists) {
2678 classfile_parse_error(
2679 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2680 CHECK_NULL);
2681 }
2682 runtime_invisible_annotations_exists = true;
2683 if (PreserveAllAnnotations) {
2684 runtime_invisible_annotations_length = method_attribute_length;
2685 runtime_invisible_annotations = cfs->current();
2686 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2687 }
2688 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2689 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2690 if (runtime_visible_parameter_annotations != NULL) {
2691 classfile_parse_error(
2692 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2693 CHECK_NULL);
2694 }
2695 runtime_visible_parameter_annotations_length = method_attribute_length;
2696 runtime_visible_parameter_annotations = cfs->current();
2697 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2698 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2699 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2700 if (runtime_invisible_parameter_annotations_exists) {
2701 classfile_parse_error(
2702 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2703 CHECK_NULL);
2704 }
2705 runtime_invisible_parameter_annotations_exists = true;
2706 if (PreserveAllAnnotations) {
2707 runtime_invisible_parameter_annotations_length = method_attribute_length;
2708 runtime_invisible_parameter_annotations = cfs->current();
2709 assert(runtime_invisible_parameter_annotations != NULL,
2710 "null invisible parameter annotations");
2711 }
2712 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2713 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2714 if (annotation_default != NULL) {
2715 classfile_parse_error(
2716 "Multiple AnnotationDefault attributes for method in class file %s",
2717 CHECK_NULL);
2718 }
2719 annotation_default_length = method_attribute_length;
2720 annotation_default = cfs->current();
2721 assert(annotation_default != NULL, "null annotation default");
2722 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2723 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2724 if (runtime_visible_type_annotations != NULL) {
2725 classfile_parse_error(
2726 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2727 CHECK_NULL);
2728 }
2729 runtime_visible_type_annotations_length = method_attribute_length;
2730 runtime_visible_type_annotations = cfs->current();
2731 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2732 // No need for the VM to parse Type annotations
2733 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2734 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2735 if (runtime_invisible_type_annotations_exists) {
2736 classfile_parse_error(
2737 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2738 CHECK_NULL);
2739 } else {
2740 runtime_invisible_type_annotations_exists = true;
2741 }
2742 if (PreserveAllAnnotations) {
2743 runtime_invisible_type_annotations_length = method_attribute_length;
2744 runtime_invisible_type_annotations = cfs->current();
2745 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2746 }
2747 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2748 } else {
2749 // Skip unknown attributes
2750 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2751 }
2752 } else {
2753 // Skip unknown attributes
2754 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2755 }
2756 }
2757
2758 if (linenumber_table != NULL) {
2759 linenumber_table->write_terminator();
2760 linenumber_table_length = linenumber_table->position();
2761 }
2762
2763 // Make sure there's at least one Code attribute in non-native/non-abstract method
2764 if (_need_verify) {
2765 guarantee_property(access_flags.is_native() ||
2766 access_flags.is_abstract() ||
2767 parsed_code_attribute,
2768 "Absent Code attribute in method that is not native or abstract in class file %s",
2769 CHECK_NULL);
2770 }
2771
2772 // All sizing information for a Method* is finally available, now create it
2773 InlineTableSizes sizes(
2774 total_lvt_length,
2775 linenumber_table_length,
2776 exception_table_length,
2777 checked_exceptions_length,
2778 method_parameters_length,
2779 generic_signature_index,
2780 runtime_visible_annotations_length +
2781 runtime_invisible_annotations_length,
2782 runtime_visible_parameter_annotations_length +
2783 runtime_invisible_parameter_annotations_length,
2784 runtime_visible_type_annotations_length +
2785 runtime_invisible_type_annotations_length,
2786 annotation_default_length,
2787 0);
2788
2789 Method* const m = Method::allocate(_loader_data,
2790 code_length,
2791 access_flags,
2792 &sizes,
2793 ConstMethod::NORMAL,
2794 CHECK_NULL);
2795
2796 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2797
2798 // Fill in information from fixed part (access_flags already set)
2799 m->set_constants(_cp);
2800 m->set_name_index(name_index);
2801 m->set_signature_index(signature_index);
2802 m->compute_from_signature(cp->symbol_at(signature_index));
2803 assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2804
2805 // Fill in code attribute information
2806 m->set_max_stack(max_stack);
2807 m->set_max_locals(max_locals);
2808 if (stackmap_data != NULL) {
2809 m->constMethod()->copy_stackmap_data(_loader_data,
2810 (u1*)stackmap_data,
2811 stackmap_data_length,
2812 CHECK_NULL);
2813 }
2814
2815 // Copy byte codes
2816 m->set_code((u1*)code_start);
2817
2818 // Copy line number table
2819 if (linenumber_table != NULL) {
2820 memcpy(m->compressed_linenumber_table(),
2821 linenumber_table->buffer(),
2822 linenumber_table_length);
2823 }
2824
2825 // Copy exception table
2826 if (exception_table_length > 0) {
2827 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2828 m->exception_table_start(),
2829 exception_table_length * sizeof(ExceptionTableElement),
2830 sizeof(u2));
2831 }
2832
2833 // Copy method parameters
2834 if (method_parameters_length > 0) {
2835 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2836 for (int i = 0; i < method_parameters_length; i++) {
2837 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2838 method_parameters_data += 2;
2839 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2840 method_parameters_data += 2;
2841 }
2842 }
2843
2844 // Copy checked exceptions
2845 if (checked_exceptions_length > 0) {
2846 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2847 m->checked_exceptions_start(),
2848 checked_exceptions_length * sizeof(CheckedExceptionElement),
2849 sizeof(u2));
2850 }
2851
2852 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2853 if (total_lvt_length > 0) {
2854 promoted_flags->set_has_localvariable_table();
2855 copy_localvariable_table(m->constMethod(),
2856 lvt_cnt,
2857 localvariable_table_length,
2858 localvariable_table_start,
2859 lvtt_cnt,
2860 localvariable_type_table_length,
2861 localvariable_type_table_start,
2862 CHECK_NULL);
2863 }
2864
2865 if (parsed_annotations.has_any_annotations())
2866 parsed_annotations.apply_to(methodHandle(THREAD, m));
2867
2868 // Copy annotations
2869 copy_method_annotations(m->constMethod(),
2870 runtime_visible_annotations,
2871 runtime_visible_annotations_length,
2872 runtime_invisible_annotations,
2873 runtime_invisible_annotations_length,
2874 runtime_visible_parameter_annotations,
2875 runtime_visible_parameter_annotations_length,
2876 runtime_invisible_parameter_annotations,
2877 runtime_invisible_parameter_annotations_length,
2878 runtime_visible_type_annotations,
2879 runtime_visible_type_annotations_length,
2880 runtime_invisible_type_annotations,
2881 runtime_invisible_type_annotations_length,
2882 annotation_default,
2883 annotation_default_length,
2884 CHECK_NULL);
2885
2886 if (name == vmSymbols::finalize_method_name() &&
2887 signature == vmSymbols::void_method_signature()) {
2888 if (m->is_empty_method()) {
2889 _has_empty_finalizer = true;
2890 } else {
2891 _has_finalizer = true;
2892 }
2893 }
2894 if (name == vmSymbols::object_initializer_name() &&
2895 signature == vmSymbols::void_method_signature() &&
2896 m->is_vanilla_constructor()) {
2897 _has_vanilla_constructor = true;
2898 }
2899
2900 NOT_PRODUCT(m->verify());
2901 return m;
2902 }
2903
2904
2905 // The promoted_flags parameter is used to pass relevant access_flags
2906 // from the methods back up to the containing klass. These flag values
2907 // are added to klass's access_flags.
2908 // Side-effects: populates the _methods field in the parser
2909 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2910 bool is_interface,
2911 AccessFlags* promoted_flags,
2912 bool* has_final_method,
2913 bool* declares_nonstatic_concrete_methods,
2914 TRAPS) {
2915 assert(cfs != NULL, "invariant");
2916 assert(promoted_flags != NULL, "invariant");
2917 assert(has_final_method != NULL, "invariant");
2918 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2919
2920 assert(NULL == _methods, "invariant");
2921
2922 cfs->guarantee_more(2, CHECK); // length
2923 const u2 length = cfs->get_u2_fast();
2924 if (length == 0) {
2925 _methods = Universe::the_empty_method_array();
2926 } else {
2927 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2928 length,
2929 NULL,
2930 CHECK);
2931
2932 for (int index = 0; index < length; index++) {
2933 Method* method = parse_method(cfs,
2934 is_interface,
2935 _cp,
2936 promoted_flags,
2937 CHECK);
2938
2939 if (method->is_final()) {
2940 *has_final_method = true;
2941 }
2942 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2943 // used for interface initialization, and default method inheritance analysis
2944 if (is_interface && !(*declares_nonstatic_concrete_methods)
2945 && !method->is_abstract() && !method->is_static()) {
2946 *declares_nonstatic_concrete_methods = true;
2947 }
2948 _methods->at_put(index, method);
2949 }
2950
2951 if (_need_verify && length > 1) {
2952 // Check duplicated methods
2953 ResourceMark rm(THREAD);
2954 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2955 THREAD, NameSigHash*, HASH_ROW_SIZE);
2956 initialize_hashtable(names_and_sigs);
2957 bool dup = false;
2958 const Symbol* name = NULL;
2959 const Symbol* sig = NULL;
2960 {
2961 debug_only(NoSafepointVerifier nsv;)
2962 for (int i = 0; i < length; i++) {
2963 const Method* const m = _methods->at(i);
2964 name = m->name();
2965 sig = m->signature();
2966 // If no duplicates, add name/signature in hashtable names_and_sigs.
2967 if (!put_after_lookup(name, sig, names_and_sigs)) {
2968 dup = true;
2969 break;
2970 }
2971 }
2972 }
2973 if (dup) {
2974 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2975 name->as_C_string(), sig->as_klass_external_name(), CHECK);
2976 }
2977 }
2978 }
2979 }
2980
2981 static const intArray* sort_methods(Array<Method*>* methods) {
2982 const int length = methods->length();
2983 // If JVMTI original method ordering or sharing is enabled we have to
2984 // remember the original class file ordering.
2985 // We temporarily use the vtable_index field in the Method* to store the
2986 // class file index, so we can read in after calling qsort.
2987 // Put the method ordering in the shared archive.
2988 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) {
2989 for (int index = 0; index < length; index++) {
2990 Method* const m = methods->at(index);
2991 assert(!m->valid_vtable_index(), "vtable index should not be set");
2992 m->set_vtable_index(index);
2993 }
2994 }
2995 // Sort method array by ascending method name (for faster lookups & vtable construction)
2996 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2997 Method::sort_methods(methods);
2998
2999 intArray* method_ordering = NULL;
3000 // If JVMTI original method ordering or sharing is enabled construct int
3001 // array remembering the original ordering
3002 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) {
3003 method_ordering = new intArray(length, length, -1);
3004 for (int index = 0; index < length; index++) {
3005 Method* const m = methods->at(index);
3006 const int old_index = m->vtable_index();
3007 assert(old_index >= 0 && old_index < length, "invalid method index");
3008 method_ordering->at_put(index, old_index);
3009 m->set_vtable_index(Method::invalid_vtable_index);
3010 }
3011 }
3012 return method_ordering;
3013 }
3014
3015 // Parse generic_signature attribute for methods and fields
3016 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3017 TRAPS) {
3018 assert(cfs != NULL, "invariant");
3019
3020 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3021 const u2 generic_signature_index = cfs->get_u2_fast();
3022 check_property(
3023 valid_symbol_at(generic_signature_index),
3024 "Invalid Signature attribute at constant pool index %u in class file %s",
3025 generic_signature_index, CHECK_0);
3026 return generic_signature_index;
3027 }
3028
3029 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3030 TRAPS) {
3031
3032 assert(cfs != NULL, "invariant");
3033
3034 cfs->guarantee_more(2, CHECK); // sourcefile_index
3035 const u2 sourcefile_index = cfs->get_u2_fast();
3036 check_property(
3037 valid_symbol_at(sourcefile_index),
3038 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3039 sourcefile_index, CHECK);
3040 set_class_sourcefile_index(sourcefile_index);
3041 }
3042
3043 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3044 int length,
3045 TRAPS) {
3046 assert(cfs != NULL, "invariant");
3047
3048 const u1* const sde_buffer = cfs->current();
3049 assert(sde_buffer != NULL, "null sde buffer");
3050
3051 // Don't bother storing it if there is no way to retrieve it
3052 if (JvmtiExport::can_get_source_debug_extension()) {
3053 assert((length+1) > length, "Overflow checking");
3054 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3055 for (int i = 0; i < length; i++) {
3056 sde[i] = sde_buffer[i];
3057 }
3058 sde[length] = '\0';
3059 set_class_sde_buffer((const char*)sde, length);
3060 }
3061 // Got utf8 string, set stream position forward
3062 cfs->skip_u1(length, CHECK);
3063 }
3064
3065
3066 // Inner classes can be static, private or protected (classic VM does this)
3067 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3068 JVM_ACC_PRIVATE | \
3069 JVM_ACC_PROTECTED | \
3070 JVM_ACC_STATIC \
3071 )
3072
3073 // Return number of classes in the inner classes attribute table
3074 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3075 const u1* const inner_classes_attribute_start,
3076 bool parsed_enclosingmethod_attribute,
3077 u2 enclosing_method_class_index,
3078 u2 enclosing_method_method_index,
3079 TRAPS) {
3080 const u1* const current_mark = cfs->current();
3081 u2 length = 0;
3082 if (inner_classes_attribute_start != NULL) {
3083 cfs->set_current(inner_classes_attribute_start);
3084 cfs->guarantee_more(2, CHECK_0); // length
3085 length = cfs->get_u2_fast();
3086 }
3087
3088 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3089 // method data:
3090 // [inner_class_info_index,
3091 // outer_class_info_index,
3092 // inner_name_index,
3093 // inner_class_access_flags,
3094 // ...
3095 // enclosing_method_class_index,
3096 // enclosing_method_method_index]
3097 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3098 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3099 _inner_classes = inner_classes;
3100
3101 int index = 0;
3102 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3103 for (int n = 0; n < length; n++) {
3104 // Inner class index
3105 const u2 inner_class_info_index = cfs->get_u2_fast();
3106 check_property(
3107 valid_klass_reference_at(inner_class_info_index),
3108 "inner_class_info_index %u has bad constant type in class file %s",
3109 inner_class_info_index, CHECK_0);
3110 // Outer class index
3111 const u2 outer_class_info_index = cfs->get_u2_fast();
3112 check_property(
3113 outer_class_info_index == 0 ||
3114 valid_klass_reference_at(outer_class_info_index),
3115 "outer_class_info_index %u has bad constant type in class file %s",
3116 outer_class_info_index, CHECK_0);
3117 // Inner class name
3118 const u2 inner_name_index = cfs->get_u2_fast();
3119 check_property(
3120 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3121 "inner_name_index %u has bad constant type in class file %s",
3122 inner_name_index, CHECK_0);
3123 if (_need_verify) {
3124 guarantee_property(inner_class_info_index != outer_class_info_index,
3125 "Class is both outer and inner class in class file %s", CHECK_0);
3126 }
3127 // Access flags
3128 jint flags;
3129 // JVM_ACC_MODULE is defined in JDK-9 and later.
3130 if (_major_version >= JAVA_9_VERSION) {
3131 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3132 } else {
3133 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3134 }
3135 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3136 // Set abstract bit for old class files for backward compatibility
3137 flags |= JVM_ACC_ABSTRACT;
3138 }
3139 verify_legal_class_modifiers(flags, CHECK_0);
3140 AccessFlags inner_access_flags(flags);
3141
3142 inner_classes->at_put(index++, inner_class_info_index);
3143 inner_classes->at_put(index++, outer_class_info_index);
3144 inner_classes->at_put(index++, inner_name_index);
3145 inner_classes->at_put(index++, inner_access_flags.as_short());
3146 }
3147
3148 // 4347400: make sure there's no duplicate entry in the classes array
3149 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3150 for(int i = 0; i < length * 4; i += 4) {
3151 for(int j = i + 4; j < length * 4; j += 4) {
3152 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3153 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3154 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3155 inner_classes->at(i+3) != inner_classes->at(j+3)),
3156 "Duplicate entry in InnerClasses in class file %s",
3157 CHECK_0);
3158 }
3159 }
3160 }
3161
3162 // Set EnclosingMethod class and method indexes.
3163 if (parsed_enclosingmethod_attribute) {
3164 inner_classes->at_put(index++, enclosing_method_class_index);
3165 inner_classes->at_put(index++, enclosing_method_method_index);
3166 }
3167 assert(index == size, "wrong size");
3168
3169 // Restore buffer's current position.
3170 cfs->set_current(current_mark);
3171
3172 return length;
3173 }
3174
3175 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3176 const u1* const nest_members_attribute_start,
3177 TRAPS) {
3178 const u1* const current_mark = cfs->current();
3179 u2 length = 0;
3180 if (nest_members_attribute_start != NULL) {
3181 cfs->set_current(nest_members_attribute_start);
3182 cfs->guarantee_more(2, CHECK_0); // length
3183 length = cfs->get_u2_fast();
3184 }
3185 const int size = length;
3186 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3187 _nest_members = nest_members;
3188
3189 int index = 0;
3190 cfs->guarantee_more(2 * length, CHECK_0);
3191 for (int n = 0; n < length; n++) {
3192 const u2 class_info_index = cfs->get_u2_fast();
3193 check_property(
3194 valid_klass_reference_at(class_info_index),
3195 "Nest member class_info_index %u has bad constant type in class file %s",
3196 class_info_index, CHECK_0);
3197 nest_members->at_put(index++, class_info_index);
3198 }
3199 assert(index == size, "wrong size");
3200
3201 // Restore buffer's current position.
3202 cfs->set_current(current_mark);
3203
3204 return length;
3205 }
3206
3207 // Record {
3208 // u2 attribute_name_index;
3209 // u4 attribute_length;
3210 // u2 components_count;
3211 // component_info components[components_count];
3212 // }
3213 // component_info {
3214 // u2 name_index;
3215 // u2 descriptor_index
3216 // u2 attributes_count;
3217 // attribute_info_attributes[attributes_count];
3218 // }
3219 u2 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3220 const ConstantPool* cp,
3221 const u1* const record_attribute_start,
3222 TRAPS) {
3223 const u1* const current_mark = cfs->current();
3224 int components_count = 0;
3225 unsigned int calculate_attr_size = 0;
3226 if (record_attribute_start != NULL) {
3227 cfs->set_current(record_attribute_start);
3228 cfs->guarantee_more(2, CHECK_0); // num of components
3229 components_count = (int)cfs->get_u2_fast();
3230 calculate_attr_size = 2;
3231 }
3232
3233 Array<RecordComponent*>* const record_components =
3234 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, NULL, CHECK_0);
3235 _record_components = record_components;
3236
3237 for (int x = 0; x < components_count; x++) {
3238 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3239
3240 const u2 name_index = cfs->get_u2_fast();
3241 check_property(valid_symbol_at(name_index),
3242 "Invalid constant pool index %u for name in Record attribute in class file %s",
3243 name_index, CHECK_0);
3244 const Symbol* const name = cp->symbol_at(name_index);
3245 verify_legal_field_name(name, CHECK_0);
3246
3247 const u2 descriptor_index = cfs->get_u2_fast();
3248 check_property(valid_symbol_at(descriptor_index),
3249 "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3250 descriptor_index, CHECK_0);
3251 const Symbol* const descr = cp->symbol_at(descriptor_index);
3252 verify_legal_field_signature(name, descr, CHECK_0);
3253
3254 const u2 attributes_count = cfs->get_u2_fast();
3255 calculate_attr_size += 6;
3256 u2 generic_sig_index = 0;
3257 const u1* runtime_visible_annotations = NULL;
3258 int runtime_visible_annotations_length = 0;
3259 const u1* runtime_invisible_annotations = NULL;
3260 int runtime_invisible_annotations_length = 0;
3261 bool runtime_invisible_annotations_exists = false;
3262 const u1* runtime_visible_type_annotations = NULL;
3263 int runtime_visible_type_annotations_length = 0;
3264 const u1* runtime_invisible_type_annotations = NULL;
3265 int runtime_invisible_type_annotations_length = 0;
3266 bool runtime_invisible_type_annotations_exists = false;
3267
3268 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3269 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
3270 for (int y = 0; y < attributes_count; y++) {
3271 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
3272 const u2 attribute_name_index = cfs->get_u2_fast();
3273 const u4 attribute_length = cfs->get_u4_fast();
3274 calculate_attr_size += 6;
3275 check_property(
3276 valid_symbol_at(attribute_name_index),
3277 "Invalid Record attribute name index %u in class file %s",
3278 attribute_name_index, CHECK_0);
3279
3280 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3281 if (attribute_name == vmSymbols::tag_signature()) {
3282 if (generic_sig_index != 0) {
3283 classfile_parse_error(
3284 "Multiple Signature attributes for Record component in class file %s",
3285 CHECK_0);
3286 }
3287 if (attribute_length != 2) {
3288 classfile_parse_error(
3289 "Invalid Signature attribute length %u in Record component in class file %s",
3290 attribute_length, CHECK_0);
3291 }
3292 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3293
3294 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3295 if (runtime_visible_annotations != NULL) {
3296 classfile_parse_error(
3297 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", CHECK_0);
3298 }
3299 runtime_visible_annotations_length = attribute_length;
3300 runtime_visible_annotations = cfs->current();
3301
3302 assert(runtime_visible_annotations != NULL, "null record component visible annotation");
3303 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3304 cfs->skip_u1_fast(runtime_visible_annotations_length);
3305
3306 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3307 if (runtime_invisible_annotations_exists) {
3308 classfile_parse_error(
3309 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", CHECK_0);
3310 }
3311 runtime_invisible_annotations_exists = true;
3312 if (PreserveAllAnnotations) {
3313 runtime_invisible_annotations_length = attribute_length;
3314 runtime_invisible_annotations = cfs->current();
3315 assert(runtime_invisible_annotations != NULL, "null record component invisible annotation");
3316 }
3317 cfs->skip_u1(attribute_length, CHECK_0);
3318
3319 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3320 if (runtime_visible_type_annotations != NULL) {
3321 classfile_parse_error(
3322 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", CHECK_0);
3323 }
3324 runtime_visible_type_annotations_length = attribute_length;
3325 runtime_visible_type_annotations = cfs->current();
3326
3327 assert(runtime_visible_type_annotations != NULL, "null record component visible type annotation");
3328 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3329 cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3330
3331 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3332 if (runtime_invisible_type_annotations_exists) {
3333 classfile_parse_error(
3334 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", CHECK_0);
3335 }
3336 runtime_invisible_type_annotations_exists = true;
3337 if (PreserveAllAnnotations) {
3338 runtime_invisible_type_annotations_length = attribute_length;
3339 runtime_invisible_type_annotations = cfs->current();
3340 assert(runtime_invisible_type_annotations != NULL, "null record component invisible type annotation");
3341 }
3342 cfs->skip_u1(attribute_length, CHECK_0);
3343
3344 } else {
3345 // Skip unknown attributes
3346 cfs->skip_u1(attribute_length, CHECK_0);
3347 }
3348 calculate_attr_size += attribute_length;
3349 } // End of attributes For loop
3350
3351 AnnotationArray* annotations = assemble_annotations(runtime_visible_annotations,
3352 runtime_visible_annotations_length,
3353 runtime_invisible_annotations,
3354 runtime_invisible_annotations_length,
3355 CHECK_0);
3356 AnnotationArray* type_annotations = assemble_annotations(runtime_visible_type_annotations,
3357 runtime_visible_type_annotations_length,
3358 runtime_invisible_type_annotations,
3359 runtime_invisible_type_annotations_length,
3360 CHECK_0);
3361
3362 RecordComponent* record_component =
3363 RecordComponent::allocate(_loader_data, name_index, descriptor_index,
3364 attributes_count, generic_sig_index,
3365 annotations, type_annotations, CHECK_0);
3366 record_components->at_put(x, record_component);
3367 } // End of component processing loop
3368
3369 // Restore buffer's current position.
3370 cfs->set_current(current_mark);
3371 return calculate_attr_size;
3372 }
3373
3374 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3375 set_class_synthetic_flag(true);
3376 }
3377
3378 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3379 assert(cfs != NULL, "invariant");
3380
3381 const u2 signature_index = cfs->get_u2(CHECK);
3382 check_property(
3383 valid_symbol_at(signature_index),
3384 "Invalid constant pool index %u in Signature attribute in class file %s",
3385 signature_index, CHECK);
3386 set_class_generic_signature_index(signature_index);
3387 }
3388
3389 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3390 ConstantPool* cp,
3391 u4 attribute_byte_length,
3392 TRAPS) {
3393 assert(cfs != NULL, "invariant");
3394 assert(cp != NULL, "invariant");
3395
3396 const u1* const current_start = cfs->current();
3397
3398 guarantee_property(attribute_byte_length >= sizeof(u2),
3399 "Invalid BootstrapMethods attribute length %u in class file %s",
3400 attribute_byte_length,
3401 CHECK);
3402
3403 cfs->guarantee_more(attribute_byte_length, CHECK);
3404
3405 const int attribute_array_length = cfs->get_u2_fast();
3406
3407 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3408 "Short length on BootstrapMethods in class file %s",
3409 CHECK);
3410
3411
3412 // The attribute contains a counted array of counted tuples of shorts,
3413 // represending bootstrap specifiers:
3414 // length*{bootstrap_method_index, argument_count*{argument_index}}
3415 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3416 // operand_count = number of shorts in attr, except for leading length
3417
3418 // The attribute is copied into a short[] array.
3419 // The array begins with a series of short[2] pairs, one for each tuple.
3420 const int index_size = (attribute_array_length * 2);
3421
3422 Array<u2>* const operands =
3423 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3424
3425 // Eagerly assign operands so they will be deallocated with the constant
3426 // pool if there is an error.
3427 cp->set_operands(operands);
3428
3429 int operand_fill_index = index_size;
3430 const int cp_size = cp->length();
3431
3432 for (int n = 0; n < attribute_array_length; n++) {
3433 // Store a 32-bit offset into the header of the operand array.
3434 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3435
3436 // Read a bootstrap specifier.
3437 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3438 const u2 bootstrap_method_index = cfs->get_u2_fast();
3439 const u2 argument_count = cfs->get_u2_fast();
3440 check_property(
3441 valid_cp_range(bootstrap_method_index, cp_size) &&
3442 cp->tag_at(bootstrap_method_index).is_method_handle(),
3443 "bootstrap_method_index %u has bad constant type in class file %s",
3444 bootstrap_method_index,
3445 CHECK);
3446
3447 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3448 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3449 CHECK);
3450
3451 operands->at_put(operand_fill_index++, bootstrap_method_index);
3452 operands->at_put(operand_fill_index++, argument_count);
3453
3454 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3455 for (int j = 0; j < argument_count; j++) {
3456 const u2 argument_index = cfs->get_u2_fast();
3457 check_property(
3458 valid_cp_range(argument_index, cp_size) &&
3459 cp->tag_at(argument_index).is_loadable_constant(),
3460 "argument_index %u has bad constant type in class file %s",
3461 argument_index,
3462 CHECK);
3463 operands->at_put(operand_fill_index++, argument_index);
3464 }
3465 }
3466 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3467 "Bad length on BootstrapMethods in class file %s",
3468 CHECK);
3469 }
3470
3471 bool ClassFileParser::supports_records() {
3472 return _major_version == JVM_CLASSFILE_MAJOR_VERSION &&
3473 _minor_version == JAVA_PREVIEW_MINOR_VERSION &&
3474 Arguments::enable_preview();
3475 }
3476
3477 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3478 ConstantPool* cp,
3479 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3480 TRAPS) {
3481 assert(cfs != NULL, "invariant");
3482 assert(cp != NULL, "invariant");
3483 assert(parsed_annotations != NULL, "invariant");
3484
3485 // Set inner classes attribute to default sentinel
3486 _inner_classes = Universe::the_empty_short_array();
3487 // Set nest members attribute to default sentinel
3488 _nest_members = Universe::the_empty_short_array();
3489 cfs->guarantee_more(2, CHECK); // attributes_count
3490 u2 attributes_count = cfs->get_u2_fast();
3491 bool parsed_sourcefile_attribute = false;
3492 bool parsed_innerclasses_attribute = false;
3493 bool parsed_nest_members_attribute = false;
3494 bool parsed_nest_host_attribute = false;
3495 bool parsed_record_attribute = false;
3496 bool parsed_enclosingmethod_attribute = false;
3497 bool parsed_bootstrap_methods_attribute = false;
3498 const u1* runtime_visible_annotations = NULL;
3499 int runtime_visible_annotations_length = 0;
3500 const u1* runtime_invisible_annotations = NULL;
3501 int runtime_invisible_annotations_length = 0;
3502 const u1* runtime_visible_type_annotations = NULL;
3503 int runtime_visible_type_annotations_length = 0;
3504 const u1* runtime_invisible_type_annotations = NULL;
3505 int runtime_invisible_type_annotations_length = 0;
3506 bool runtime_invisible_type_annotations_exists = false;
3507 bool runtime_invisible_annotations_exists = false;
3508 bool parsed_source_debug_ext_annotations_exist = false;
3509 const u1* inner_classes_attribute_start = NULL;
3510 u4 inner_classes_attribute_length = 0;
3511 u2 enclosing_method_class_index = 0;
3512 u2 enclosing_method_method_index = 0;
3513 const u1* nest_members_attribute_start = NULL;
3514 u4 nest_members_attribute_length = 0;
3515 const u1* record_attribute_start = NULL;
3516 u4 record_attribute_length = 0;
3517
3518 // Iterate over attributes
3519 while (attributes_count--) {
3520 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3521 const u2 attribute_name_index = cfs->get_u2_fast();
3522 const u4 attribute_length = cfs->get_u4_fast();
3523 check_property(
3524 valid_symbol_at(attribute_name_index),
3525 "Attribute name has bad constant pool index %u in class file %s",
3526 attribute_name_index, CHECK);
3527 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3528 if (tag == vmSymbols::tag_source_file()) {
3529 // Check for SourceFile tag
3530 if (_need_verify) {
3531 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3532 }
3533 if (parsed_sourcefile_attribute) {
3534 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3535 } else {
3536 parsed_sourcefile_attribute = true;
3537 }
3538 parse_classfile_sourcefile_attribute(cfs, CHECK);
3539 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3540 // Check for SourceDebugExtension tag
3541 if (parsed_source_debug_ext_annotations_exist) {
3542 classfile_parse_error(
3543 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3544 }
3545 parsed_source_debug_ext_annotations_exist = true;
3546 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3547 } else if (tag == vmSymbols::tag_inner_classes()) {
3548 // Check for InnerClasses tag
3549 if (parsed_innerclasses_attribute) {
3550 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3551 } else {
3552 parsed_innerclasses_attribute = true;
3553 }
3554 inner_classes_attribute_start = cfs->current();
3555 inner_classes_attribute_length = attribute_length;
3556 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3557 } else if (tag == vmSymbols::tag_synthetic()) {
3558 // Check for Synthetic tag
3559 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3560 if (attribute_length != 0) {
3561 classfile_parse_error(
3562 "Invalid Synthetic classfile attribute length %u in class file %s",
3563 attribute_length, CHECK);
3564 }
3565 parse_classfile_synthetic_attribute(CHECK);
3566 } else if (tag == vmSymbols::tag_deprecated()) {
3567 // Check for Deprecatd tag - 4276120
3568 if (attribute_length != 0) {
3569 classfile_parse_error(
3570 "Invalid Deprecated classfile attribute length %u in class file %s",
3571 attribute_length, CHECK);
3572 }
3573 } else if (_major_version >= JAVA_1_5_VERSION) {
3574 if (tag == vmSymbols::tag_signature()) {
3575 if (_generic_signature_index != 0) {
3576 classfile_parse_error(
3577 "Multiple Signature attributes in class file %s", CHECK);
3578 }
3579 if (attribute_length != 2) {
3580 classfile_parse_error(
3581 "Wrong Signature attribute length %u in class file %s",
3582 attribute_length, CHECK);
3583 }
3584 parse_classfile_signature_attribute(cfs, CHECK);
3585 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3586 if (runtime_visible_annotations != NULL) {
3587 classfile_parse_error(
3588 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3589 }
3590 runtime_visible_annotations_length = attribute_length;
3591 runtime_visible_annotations = cfs->current();
3592 assert(runtime_visible_annotations != NULL, "null visible annotations");
3593 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3594 parse_annotations(cp,
3595 runtime_visible_annotations,
3596 runtime_visible_annotations_length,
3597 parsed_annotations,
3598 _loader_data,
3599 CHECK);
3600 cfs->skip_u1_fast(runtime_visible_annotations_length);
3601 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3602 if (runtime_invisible_annotations_exists) {
3603 classfile_parse_error(
3604 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3605 }
3606 runtime_invisible_annotations_exists = true;
3607 if (PreserveAllAnnotations) {
3608 runtime_invisible_annotations_length = attribute_length;
3609 runtime_invisible_annotations = cfs->current();
3610 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3611 }
3612 cfs->skip_u1(attribute_length, CHECK);
3613 } else if (tag == vmSymbols::tag_enclosing_method()) {
3614 if (parsed_enclosingmethod_attribute) {
3615 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3616 } else {
3617 parsed_enclosingmethod_attribute = true;
3618 }
3619 guarantee_property(attribute_length == 4,
3620 "Wrong EnclosingMethod attribute length %u in class file %s",
3621 attribute_length, CHECK);
3622 cfs->guarantee_more(4, CHECK); // class_index, method_index
3623 enclosing_method_class_index = cfs->get_u2_fast();
3624 enclosing_method_method_index = cfs->get_u2_fast();
3625 if (enclosing_method_class_index == 0) {
3626 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3627 }
3628 // Validate the constant pool indices and types
3629 check_property(valid_klass_reference_at(enclosing_method_class_index),
3630 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3631 if (enclosing_method_method_index != 0 &&
3632 (!cp->is_within_bounds(enclosing_method_method_index) ||
3633 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3634 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3635 }
3636 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3637 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3638 if (parsed_bootstrap_methods_attribute) {
3639 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3640 }
3641 parsed_bootstrap_methods_attribute = true;
3642 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3643 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3644 if (runtime_visible_type_annotations != NULL) {
3645 classfile_parse_error(
3646 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3647 }
3648 runtime_visible_type_annotations_length = attribute_length;
3649 runtime_visible_type_annotations = cfs->current();
3650 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3651 // No need for the VM to parse Type annotations
3652 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3653 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3654 if (runtime_invisible_type_annotations_exists) {
3655 classfile_parse_error(
3656 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3657 } else {
3658 runtime_invisible_type_annotations_exists = true;
3659 }
3660 if (PreserveAllAnnotations) {
3661 runtime_invisible_type_annotations_length = attribute_length;
3662 runtime_invisible_type_annotations = cfs->current();
3663 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3664 }
3665 cfs->skip_u1(attribute_length, CHECK);
3666 } else if (_major_version >= JAVA_11_VERSION) {
3667 if (tag == vmSymbols::tag_nest_members()) {
3668 // Check for NestMembers tag
3669 if (parsed_nest_members_attribute) {
3670 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK);
3671 } else {
3672 parsed_nest_members_attribute = true;
3673 }
3674 if (parsed_nest_host_attribute) {
3675 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK);
3676 }
3677 nest_members_attribute_start = cfs->current();
3678 nest_members_attribute_length = attribute_length;
3679 cfs->skip_u1(nest_members_attribute_length, CHECK);
3680 } else if (tag == vmSymbols::tag_nest_host()) {
3681 if (parsed_nest_host_attribute) {
3682 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK);
3683 } else {
3684 parsed_nest_host_attribute = true;
3685 }
3686 if (parsed_nest_members_attribute) {
3687 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK);
3688 }
3689 if (_need_verify) {
3690 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3691 }
3692 cfs->guarantee_more(2, CHECK);
3693 u2 class_info_index = cfs->get_u2_fast();
3694 check_property(
3695 valid_klass_reference_at(class_info_index),
3696 "Nest-host class_info_index %u has bad constant type in class file %s",
3697 class_info_index, CHECK);
3698 _nest_host = class_info_index;
3699 } else if (_major_version >= JAVA_14_VERSION) {
3700 if (tag == vmSymbols::tag_record()) {
3701 // Skip over Record attribute if not supported or if super class is
3702 // not java.lang.Record.
3703 if (supports_records() &&
3704 cp->klass_name_at(_super_class_index) == vmSymbols::java_lang_Record()) {
3705 if (parsed_record_attribute) {
3706 classfile_parse_error("Multiple Record attributes in class file %s", CHECK);
3707 }
3708 // Check that class is final and not abstract.
3709 if (!_access_flags.is_final() || _access_flags.is_abstract()) {
3710 classfile_parse_error("Record attribute in non-final or abstract class file %s", CHECK);
3711 }
3712 parsed_record_attribute = true;
3713 record_attribute_start = cfs->current();
3714 record_attribute_length = attribute_length;
3715 } else if (log_is_enabled(Info, class, record)) {
3716 // Log why the Record attribute was ignored. Note that if the
3717 // class file version is JVM_CLASSFILE_MAJOR_VERSION.65535 and
3718 // --enable-preview wasn't specified then a java.lang.UnsupportedClassVersionError
3719 // exception would have been thrown.
3720 ResourceMark rm(THREAD);
3721 if (supports_records()) {
3722 log_info(class, record)(
3723 "Ignoring Record attribute in class %s because super type is not java.lang.Record",
3724 _class_name->as_C_string());
3725 } else {
3726 log_info(class, record)(
3727 "Ignoring Record attribute in class %s because class file version is not %d.65535",
3728 _class_name->as_C_string(), JVM_CLASSFILE_MAJOR_VERSION);
3729 }
3730 }
3731 cfs->skip_u1(attribute_length, CHECK);
3732 } else {
3733 // Unknown attribute
3734 cfs->skip_u1(attribute_length, CHECK);
3735 }
3736 } else {
3737 // Unknown attribute
3738 cfs->skip_u1(attribute_length, CHECK);
3739 }
3740 } else {
3741 // Unknown attribute
3742 cfs->skip_u1(attribute_length, CHECK);
3743 }
3744 } else {
3745 // Unknown attribute
3746 cfs->skip_u1(attribute_length, CHECK);
3747 }
3748 }
3749 _class_annotations = assemble_annotations(runtime_visible_annotations,
3750 runtime_visible_annotations_length,
3751 runtime_invisible_annotations,
3752 runtime_invisible_annotations_length,
3753 CHECK);
3754 _class_type_annotations = assemble_annotations(runtime_visible_type_annotations,
3755 runtime_visible_type_annotations_length,
3756 runtime_invisible_type_annotations,
3757 runtime_invisible_type_annotations_length,
3758 CHECK);
3759
3760 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3761 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3762 cfs,
3763 inner_classes_attribute_start,
3764 parsed_innerclasses_attribute,
3765 enclosing_method_class_index,
3766 enclosing_method_method_index,
3767 CHECK);
3768 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3769 guarantee_property(
3770 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3771 "Wrong InnerClasses attribute length in class file %s", CHECK);
3772 }
3773 }
3774
3775 if (parsed_nest_members_attribute) {
3776 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3777 cfs,
3778 nest_members_attribute_start,
3779 CHECK);
3780 if (_need_verify) {
3781 guarantee_property(
3782 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3783 "Wrong NestMembers attribute length in class file %s", CHECK);
3784 }
3785 }
3786
3787 if (parsed_record_attribute) {
3788 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3789 cfs,
3790 cp,
3791 record_attribute_start,
3792 CHECK);
3793 if (_need_verify) {
3794 guarantee_property(record_attribute_length == calculated_attr_length,
3795 "Record attribute has wrong length in class file %s",
3796 CHECK);
3797 }
3798 }
3799
3800 if (_max_bootstrap_specifier_index >= 0) {
3801 guarantee_property(parsed_bootstrap_methods_attribute,
3802 "Missing BootstrapMethods attribute in class file %s", CHECK);
3803 }
3804 }
3805
3806 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3807 assert(k != NULL, "invariant");
3808
3809 if (_synthetic_flag)
3810 k->set_is_synthetic();
3811 if (_sourcefile_index != 0) {
3812 k->set_source_file_name_index(_sourcefile_index);
3813 }
3814 if (_generic_signature_index != 0) {
3815 k->set_generic_signature_index(_generic_signature_index);
3816 }
3817 if (_sde_buffer != NULL) {
3818 k->set_source_debug_extension(_sde_buffer, _sde_length);
3819 }
3820 }
3821
3822 // Create the Annotations object that will
3823 // hold the annotations array for the Klass.
3824 void ClassFileParser::create_combined_annotations(TRAPS) {
3825 if (_class_annotations == NULL &&
3826 _class_type_annotations == NULL &&
3827 _fields_annotations == NULL &&
3828 _fields_type_annotations == NULL) {
3829 // Don't create the Annotations object unnecessarily.
3830 return;
3831 }
3832
3833 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3834 annotations->set_class_annotations(_class_annotations);
3835 annotations->set_class_type_annotations(_class_type_annotations);
3836 annotations->set_fields_annotations(_fields_annotations);
3837 annotations->set_fields_type_annotations(_fields_type_annotations);
3838
3839 // This is the Annotations object that will be
3840 // assigned to InstanceKlass being constructed.
3841 _combined_annotations = annotations;
3842
3843 // The annotations arrays below has been transfered the
3844 // _combined_annotations so these fields can now be cleared.
3845 _class_annotations = NULL;
3846 _class_type_annotations = NULL;
3847 _fields_annotations = NULL;
3848 _fields_type_annotations = NULL;
3849 }
3850
3851 // Transfer ownership of metadata allocated to the InstanceKlass.
3852 void ClassFileParser::apply_parsed_class_metadata(
3853 InstanceKlass* this_klass,
3854 int java_fields_count,
3855 TRAPS) {
3856 assert(this_klass != NULL, "invariant");
3857
3858 _cp->set_pool_holder(this_klass);
3859 this_klass->set_constants(_cp);
3860 this_klass->set_fields(_fields, java_fields_count);
3861 this_klass->set_methods(_methods);
3862 this_klass->set_inner_classes(_inner_classes);
3863 this_klass->set_nest_members(_nest_members);
3864 this_klass->set_nest_host_index(_nest_host);
3865 this_klass->set_local_interfaces(_local_interfaces);
3866 this_klass->set_annotations(_combined_annotations);
3867 this_klass->set_record_components(_record_components);
3868 // Delay the setting of _transitive_interfaces until after initialize_supers() in
3869 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with
3870 // its _super. If an OOM occurs while loading the current klass, its _super field
3871 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3872 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3873 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3874
3875 // Clear out these fields so they don't get deallocated by the destructor
3876 clear_class_metadata();
3877 }
3878
3879 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3880 int runtime_visible_annotations_length,
3881 const u1* const runtime_invisible_annotations,
3882 int runtime_invisible_annotations_length,
3883 TRAPS) {
3884 AnnotationArray* annotations = NULL;
3885 if (runtime_visible_annotations != NULL ||
3886 runtime_invisible_annotations != NULL) {
3887 annotations = MetadataFactory::new_array<u1>(_loader_data,
3888 runtime_visible_annotations_length +
3889 runtime_invisible_annotations_length,
3890 CHECK_(annotations));
3891 if (runtime_visible_annotations != NULL) {
3892 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3893 annotations->at_put(i, runtime_visible_annotations[i]);
3894 }
3895 }
3896 if (runtime_invisible_annotations != NULL) {
3897 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3898 int append = runtime_visible_annotations_length+i;
3899 annotations->at_put(append, runtime_invisible_annotations[i]);
3900 }
3901 }
3902 }
3903 return annotations;
3904 }
3905
3906 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3907 const int super_class_index,
3908 const bool need_verify,
3909 TRAPS) {
3910 assert(cp != NULL, "invariant");
3911 const InstanceKlass* super_klass = NULL;
3912
3913 if (super_class_index == 0) {
3914 check_property(_class_name == vmSymbols::java_lang_Object(),
3915 "Invalid superclass index %u in class file %s",
3916 super_class_index,
3917 CHECK_NULL);
3918 } else {
3919 check_property(valid_klass_reference_at(super_class_index),
3920 "Invalid superclass index %u in class file %s",
3921 super_class_index,
3922 CHECK_NULL);
3923 // The class name should be legal because it is checked when parsing constant pool.
3924 // However, make sure it is not an array type.
3925 bool is_array = false;
3926 if (cp->tag_at(super_class_index).is_klass()) {
3927 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3928 if (need_verify)
3929 is_array = super_klass->is_array_klass();
3930 } else if (need_verify) {
3931 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3932 }
3933 if (need_verify) {
3934 guarantee_property(!is_array,
3935 "Bad superclass name in class file %s", CHECK_NULL);
3936 }
3937 }
3938 return super_klass;
3939 }
3940
3941 #ifndef PRODUCT
3942 static void print_field_layout(const Symbol* name,
3943 Array<u2>* fields,
3944 ConstantPool* cp,
3945 int instance_size,
3946 int instance_fields_start,
3947 int instance_fields_end,
3948 int static_fields_end) {
3949
3950 assert(name != NULL, "invariant");
3951
3952 tty->print("%s: field layout\n", name->as_klass_external_name());
3953 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3954 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3955 if (!fs.access_flags().is_static()) {
3956 tty->print(" @%3d \"%s\" %s\n",
3957 fs.offset(),
3958 fs.name()->as_klass_external_name(),
3959 fs.signature()->as_klass_external_name());
3960 }
3961 }
3962 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3963 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3964 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3965 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3966 if (fs.access_flags().is_static()) {
3967 tty->print(" @%3d \"%s\" %s\n",
3968 fs.offset(),
3969 fs.name()->as_klass_external_name(),
3970 fs.signature()->as_klass_external_name());
3971 }
3972 }
3973 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3974 tty->print("\n");
3975 }
3976 #endif
3977
3978 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3979 _max_nonstatic_oop_maps = max_blocks;
3980 _nonstatic_oop_map_count = 0;
3981 if (max_blocks == 0) {
3982 _nonstatic_oop_maps = NULL;
3983 } else {
3984 _nonstatic_oop_maps =
3985 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
3986 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3987 }
3988 }
3989
3990 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
3991 assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
3992 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
3993 }
3994
3995 // addition of super oop maps
3996 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3997 assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
3998 nof_blocks <= _max_nonstatic_oop_maps, "invariant");
3999
4000 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
4001 _nonstatic_oop_map_count += nof_blocks;
4002 }
4003
4004 // collection of oops
4005 void OopMapBlocksBuilder::add(int offset, int count) {
4006 if (_nonstatic_oop_map_count == 0) {
4007 _nonstatic_oop_map_count++;
4008 }
4009 OopMapBlock* nonstatic_oop_map = last_oop_map();
4010 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
4011 nonstatic_oop_map->set_offset(offset);
4012 nonstatic_oop_map->set_count(count);
4013 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
4014 nonstatic_oop_map->increment_count(count);
4015 } else { // Need a new one...
4016 _nonstatic_oop_map_count++;
4017 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
4018 nonstatic_oop_map = last_oop_map();
4019 nonstatic_oop_map->set_offset(offset);
4020 nonstatic_oop_map->set_count(count);
4021 }
4022 }
4023
4024 // general purpose copy, e.g. into allocated instanceKlass
4025 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
4026 if (_nonstatic_oop_map_count != 0) {
4027 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
4028 }
4029 }
4030
4031 // Sort and compact adjacent blocks
4032 void OopMapBlocksBuilder::compact() {
4033 if (_nonstatic_oop_map_count <= 1) {
4034 return;
4035 }
4036 /*
4037 * Since field layout sneeks in oops before values, we will be able to condense
4038 * blocks. There is potential to compact between super, own refs and values
4039 * containing refs.
4040 *
4041 * Currently compaction is slightly limited due to values being 8 byte aligned.
4042 * This may well change: FixMe if it doesn't, the code below is fairly general purpose
4043 * and maybe it doesn't need to be.
4044 */
4045 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
4046 (_sort_Fn)OopMapBlock::compare_offset);
4047 if (_nonstatic_oop_map_count < 2) {
4048 return;
4049 }
4050
4051 // Make a temp copy, and iterate through and copy back into the original
4052 ResourceMark rm;
4053 OopMapBlock* oop_maps_copy =
4054 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
4055 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
4056 copy(oop_maps_copy);
4057 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
4058 unsigned int new_count = 1;
4059 oop_maps_copy++;
4060 while(oop_maps_copy < oop_maps_copy_end) {
4061 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4062 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4063 nonstatic_oop_map->increment_count(oop_maps_copy->count());
4064 } else {
4065 nonstatic_oop_map++;
4066 new_count++;
4067 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4068 nonstatic_oop_map->set_count(oop_maps_copy->count());
4069 }
4070 oop_maps_copy++;
4071 }
4072 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
4073 _nonstatic_oop_map_count = new_count;
4074 }
4075
4076 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4077 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4078 if (_nonstatic_oop_map_count > 0) {
4079 OopMapBlock* map = _nonstatic_oop_maps;
4080 OopMapBlock* last_map = last_oop_map();
4081 assert(map <= last_map, "Last less than first");
4082 while (map <= last_map) {
4083 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4084 map->offset() + map->offset_span() - heapOopSize, map->count());
4085 map++;
4086 }
4087 }
4088 }
4089
4090 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4091 print_on(st);
4092 }
4093
4094 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
4095 void ClassFileParser::layout_fields(ConstantPool* cp,
4096 const FieldAllocationCount* fac,
4097 const ClassAnnotationCollector* parsed_annotations,
4098 FieldLayoutInfo* info,
4099 TRAPS) {
4100
4101 assert(cp != NULL, "invariant");
4102
4103 // Field size and offset computation
4104 int nonstatic_field_size = _super_klass == NULL ? 0 :
4105 _super_klass->nonstatic_field_size();
4106
4107 // Count the contended fields by type.
4108 //
4109 // We ignore static fields, because @Contended is not supported for them.
4110 // The layout code below will also ignore the static fields.
4111 int nonstatic_contended_count = 0;
4112 FieldAllocationCount fac_contended;
4113 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4114 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4115 if (fs.is_contended()) {
4116 fac_contended.count[atype]++;
4117 if (!fs.access_flags().is_static()) {
4118 nonstatic_contended_count++;
4119 }
4120 }
4121 }
4122
4123
4124 // Calculate the starting byte offsets
4125 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
4126 int next_static_double_offset = next_static_oop_offset +
4127 ((fac->count[STATIC_OOP]) * heapOopSize);
4128 if (fac->count[STATIC_DOUBLE]) {
4129 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
4130 }
4131
4132 int next_static_word_offset = next_static_double_offset +
4133 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
4134 int next_static_short_offset = next_static_word_offset +
4135 ((fac->count[STATIC_WORD]) * BytesPerInt);
4136 int next_static_byte_offset = next_static_short_offset +
4137 ((fac->count[STATIC_SHORT]) * BytesPerShort);
4138
4139 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
4140 nonstatic_field_size * heapOopSize;
4141
4142 int next_nonstatic_field_offset = nonstatic_fields_start;
4143
4144 const bool is_contended_class = parsed_annotations->is_contended();
4145
4146 // Class is contended, pad before all the fields
4147 if (is_contended_class) {
4148 next_nonstatic_field_offset += ContendedPaddingWidth;
4149 }
4150
4151 // Compute the non-contended fields count.
4152 // The packing code below relies on these counts to determine if some field
4153 // can be squeezed into the alignment gap. Contended fields are obviously
4154 // exempt from that.
4155 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
4156 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
4157 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
4158 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
4159 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
4160
4161 // Total non-static fields count, including every contended field
4162 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
4163 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
4164 fac->count[NONSTATIC_OOP];
4165
4166 const bool super_has_nonstatic_fields =
4167 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
4168 const bool has_nonstatic_fields =
4169 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
4170
4171
4172 // Prepare list of oops for oop map generation.
4173 //
4174 // "offset" and "count" lists are describing the set of contiguous oop
4175 // regions. offset[i] is the start of the i-th region, which then has
4176 // count[i] oops following. Before we know how many regions are required,
4177 // we pessimistically allocate the maps to fit all the oops into the
4178 // distinct regions.
4179
4180 int super_oop_map_count = (_super_klass == NULL) ? 0 :_super_klass->nonstatic_oop_map_count();
4181 int max_oop_map_count = super_oop_map_count + fac->count[NONSTATIC_OOP];
4182
4183 OopMapBlocksBuilder* nonstatic_oop_maps = new OopMapBlocksBuilder(max_oop_map_count);
4184 if (super_oop_map_count > 0) {
4185 nonstatic_oop_maps->initialize_inherited_blocks(_super_klass->start_of_nonstatic_oop_maps(),
4186 _super_klass->nonstatic_oop_map_count());
4187 }
4188
4189 int first_nonstatic_oop_offset = 0; // will be set for first oop field
4190
4191 bool compact_fields = true;
4192 bool allocate_oops_first = false;
4193
4194 // The next classes have predefined hard-coded fields offsets
4195 // (see in JavaClasses::compute_hard_coded_offsets()).
4196 // Use default fields allocation order for them.
4197 if (_loader_data->class_loader() == NULL &&
4198 (_class_name == vmSymbols::java_lang_ref_Reference() ||
4199 _class_name == vmSymbols::java_lang_Boolean() ||
4200 _class_name == vmSymbols::java_lang_Character() ||
4201 _class_name == vmSymbols::java_lang_Float() ||
4202 _class_name == vmSymbols::java_lang_Double() ||
4203 _class_name == vmSymbols::java_lang_Byte() ||
4204 _class_name == vmSymbols::java_lang_Short() ||
4205 _class_name == vmSymbols::java_lang_Integer() ||
4206 _class_name == vmSymbols::java_lang_Long())) {
4207 allocate_oops_first = true; // Allocate oops first
4208 compact_fields = false; // Don't compact fields
4209 }
4210
4211 int next_nonstatic_oop_offset = 0;
4212 int next_nonstatic_double_offset = 0;
4213
4214 // Rearrange fields for a given allocation style
4215 if (allocate_oops_first) {
4216 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
4217 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4218 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4219 (nonstatic_oop_count * heapOopSize);
4220 } else {
4221 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
4222 next_nonstatic_double_offset = next_nonstatic_field_offset;
4223 }
4224
4225 int nonstatic_oop_space_count = 0;
4226 int nonstatic_word_space_count = 0;
4227 int nonstatic_short_space_count = 0;
4228 int nonstatic_byte_space_count = 0;
4229 int nonstatic_oop_space_offset = 0;
4230 int nonstatic_word_space_offset = 0;
4231 int nonstatic_short_space_offset = 0;
4232 int nonstatic_byte_space_offset = 0;
4233
4234 // Try to squeeze some of the fields into the gaps due to
4235 // long/double alignment.
4236 if (nonstatic_double_count > 0) {
4237 int offset = next_nonstatic_double_offset;
4238 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
4239 if (compact_fields && offset != next_nonstatic_double_offset) {
4240 // Allocate available fields into the gap before double field.
4241 int length = next_nonstatic_double_offset - offset;
4242 assert(length == BytesPerInt, "");
4243 nonstatic_word_space_offset = offset;
4244 if (nonstatic_word_count > 0) {
4245 nonstatic_word_count -= 1;
4246 nonstatic_word_space_count = 1; // Only one will fit
4247 length -= BytesPerInt;
4248 offset += BytesPerInt;
4249 }
4250 nonstatic_short_space_offset = offset;
4251 while (length >= BytesPerShort && nonstatic_short_count > 0) {
4252 nonstatic_short_count -= 1;
4253 nonstatic_short_space_count += 1;
4254 length -= BytesPerShort;
4255 offset += BytesPerShort;
4256 }
4257 nonstatic_byte_space_offset = offset;
4258 while (length > 0 && nonstatic_byte_count > 0) {
4259 nonstatic_byte_count -= 1;
4260 nonstatic_byte_space_count += 1;
4261 length -= 1;
4262 }
4263 // Allocate oop field in the gap if there are no other fields for that.
4264 nonstatic_oop_space_offset = offset;
4265 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
4266 !allocate_oops_first) { // when oop fields not first
4267 nonstatic_oop_count -= 1;
4268 nonstatic_oop_space_count = 1; // Only one will fit
4269 length -= heapOopSize;
4270 offset += heapOopSize;
4271 }
4272 }
4273 }
4274
4275 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4276 (nonstatic_double_count * BytesPerLong);
4277 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4278 (nonstatic_word_count * BytesPerInt);
4279 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4280 (nonstatic_short_count * BytesPerShort);
4281 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4282 nonstatic_byte_count;
4283
4284 // let oops jump before padding with this allocation style
4285 if (!allocate_oops_first) {
4286 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4287 if( nonstatic_oop_count > 0 ) {
4288 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4289 }
4290 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4291 }
4292
4293 // Iterate over fields again and compute correct offsets.
4294 // The field allocation type was temporarily stored in the offset slot.
4295 // oop fields are located before non-oop fields (static and non-static).
4296 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4297
4298 // skip already laid out fields
4299 if (fs.is_offset_set()) continue;
4300
4301 // contended instance fields are handled below
4302 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4303
4304 int real_offset = 0;
4305 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4306
4307 // pack the rest of the fields
4308 switch (atype) {
4309 case STATIC_OOP:
4310 real_offset = next_static_oop_offset;
4311 next_static_oop_offset += heapOopSize;
4312 break;
4313 case STATIC_BYTE:
4314 real_offset = next_static_byte_offset;
4315 next_static_byte_offset += 1;
4316 break;
4317 case STATIC_SHORT:
4318 real_offset = next_static_short_offset;
4319 next_static_short_offset += BytesPerShort;
4320 break;
4321 case STATIC_WORD:
4322 real_offset = next_static_word_offset;
4323 next_static_word_offset += BytesPerInt;
4324 break;
4325 case STATIC_DOUBLE:
4326 real_offset = next_static_double_offset;
4327 next_static_double_offset += BytesPerLong;
4328 break;
4329 case NONSTATIC_OOP:
4330 if( nonstatic_oop_space_count > 0 ) {
4331 real_offset = nonstatic_oop_space_offset;
4332 nonstatic_oop_space_offset += heapOopSize;
4333 nonstatic_oop_space_count -= 1;
4334 } else {
4335 real_offset = next_nonstatic_oop_offset;
4336 next_nonstatic_oop_offset += heapOopSize;
4337 }
4338 nonstatic_oop_maps->add(real_offset, 1);
4339 break;
4340 case NONSTATIC_BYTE:
4341 if( nonstatic_byte_space_count > 0 ) {
4342 real_offset = nonstatic_byte_space_offset;
4343 nonstatic_byte_space_offset += 1;
4344 nonstatic_byte_space_count -= 1;
4345 } else {
4346 real_offset = next_nonstatic_byte_offset;
4347 next_nonstatic_byte_offset += 1;
4348 }
4349 break;
4350 case NONSTATIC_SHORT:
4351 if( nonstatic_short_space_count > 0 ) {
4352 real_offset = nonstatic_short_space_offset;
4353 nonstatic_short_space_offset += BytesPerShort;
4354 nonstatic_short_space_count -= 1;
4355 } else {
4356 real_offset = next_nonstatic_short_offset;
4357 next_nonstatic_short_offset += BytesPerShort;
4358 }
4359 break;
4360 case NONSTATIC_WORD:
4361 if( nonstatic_word_space_count > 0 ) {
4362 real_offset = nonstatic_word_space_offset;
4363 nonstatic_word_space_offset += BytesPerInt;
4364 nonstatic_word_space_count -= 1;
4365 } else {
4366 real_offset = next_nonstatic_word_offset;
4367 next_nonstatic_word_offset += BytesPerInt;
4368 }
4369 break;
4370 case NONSTATIC_DOUBLE:
4371 real_offset = next_nonstatic_double_offset;
4372 next_nonstatic_double_offset += BytesPerLong;
4373 break;
4374 default:
4375 ShouldNotReachHere();
4376 }
4377 fs.set_offset(real_offset);
4378 }
4379
4380
4381 // Handle the contended cases.
4382 //
4383 // Each contended field should not intersect the cache line with another contended field.
4384 // In the absence of alignment information, we end up with pessimistically separating
4385 // the fields with full-width padding.
4386 //
4387 // Additionally, this should not break alignment for the fields, so we round the alignment up
4388 // for each field.
4389 if (nonstatic_contended_count > 0) {
4390
4391 // if there is at least one contended field, we need to have pre-padding for them
4392 next_nonstatic_padded_offset += ContendedPaddingWidth;
4393
4394 // collect all contended groups
4395 ResourceBitMap bm(cp->size());
4396 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4397 // skip already laid out fields
4398 if (fs.is_offset_set()) continue;
4399
4400 if (fs.is_contended()) {
4401 bm.set_bit(fs.contended_group());
4402 }
4403 }
4404
4405 int current_group = -1;
4406 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4407
4408 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4409
4410 // skip already laid out fields
4411 if (fs.is_offset_set()) continue;
4412
4413 // skip non-contended fields and fields from different group
4414 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4415
4416 // handle statics below
4417 if (fs.access_flags().is_static()) continue;
4418
4419 int real_offset = 0;
4420 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4421
4422 switch (atype) {
4423 case NONSTATIC_BYTE:
4424 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4425 real_offset = next_nonstatic_padded_offset;
4426 next_nonstatic_padded_offset += 1;
4427 break;
4428
4429 case NONSTATIC_SHORT:
4430 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4431 real_offset = next_nonstatic_padded_offset;
4432 next_nonstatic_padded_offset += BytesPerShort;
4433 break;
4434
4435 case NONSTATIC_WORD:
4436 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4437 real_offset = next_nonstatic_padded_offset;
4438 next_nonstatic_padded_offset += BytesPerInt;
4439 break;
4440
4441 case NONSTATIC_DOUBLE:
4442 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4443 real_offset = next_nonstatic_padded_offset;
4444 next_nonstatic_padded_offset += BytesPerLong;
4445 break;
4446
4447 case NONSTATIC_OOP:
4448 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4449 real_offset = next_nonstatic_padded_offset;
4450 next_nonstatic_padded_offset += heapOopSize;
4451 nonstatic_oop_maps->add(real_offset, 1);
4452 break;
4453
4454 default:
4455 ShouldNotReachHere();
4456 }
4457
4458 if (fs.contended_group() == 0) {
4459 // Contended group defines the equivalence class over the fields:
4460 // the fields within the same contended group are not inter-padded.
4461 // The only exception is default group, which does not incur the
4462 // equivalence, and so requires intra-padding.
4463 next_nonstatic_padded_offset += ContendedPaddingWidth;
4464 }
4465
4466 fs.set_offset(real_offset);
4467 } // for
4468
4469 // Start laying out the next group.
4470 // Note that this will effectively pad the last group in the back;
4471 // this is expected to alleviate memory contention effects for
4472 // subclass fields and/or adjacent object.
4473 // If this was the default group, the padding is already in place.
4474 if (current_group != 0) {
4475 next_nonstatic_padded_offset += ContendedPaddingWidth;
4476 }
4477 }
4478
4479 // handle static fields
4480 }
4481
4482 // Entire class is contended, pad in the back.
4483 // This helps to alleviate memory contention effects for subclass fields
4484 // and/or adjacent object.
4485 if (is_contended_class) {
4486 next_nonstatic_padded_offset += ContendedPaddingWidth;
4487 }
4488
4489 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4490
4491 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize);
4492 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4493 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4494
4495 int static_field_size = (static_fields_end -
4496 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4497 nonstatic_field_size = nonstatic_field_size +
4498 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4499
4500 int instance_size = align_object_size(instance_end / wordSize);
4501
4502 assert(instance_size == align_object_size(align_up(
4503 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
4504 wordSize) / wordSize), "consistent layout helper value");
4505
4506 // Invariant: nonstatic_field end/start should only change if there are
4507 // nonstatic fields in the class, or if the class is contended. We compare
4508 // against the non-aligned value, so that end alignment will not fail the
4509 // assert without actually having the fields.
4510 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4511 is_contended_class ||
4512 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4513
4514 // Number of non-static oop map blocks allocated at end of klass.
4515 nonstatic_oop_maps->compact();
4516
4517 #ifndef PRODUCT
4518 if (PrintFieldLayout) {
4519 print_field_layout(_class_name,
4520 _fields,
4521 cp,
4522 instance_size,
4523 nonstatic_fields_start,
4524 nonstatic_fields_end,
4525 static_fields_end);
4526 }
4527
4528 #endif
4529 // Pass back information needed for InstanceKlass creation
4530 info->oop_map_blocks = nonstatic_oop_maps;
4531 info->_instance_size = instance_size;
4532 info->_static_field_size = static_field_size;
4533 info->_nonstatic_field_size = nonstatic_field_size;
4534 info->_has_nonstatic_fields = has_nonstatic_fields;
4535 }
4536
4537 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4538 assert(ik != NULL, "invariant");
4539
4540 const Klass* const super = ik->super();
4541
4542 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4543 // in which case we don't have to register objects as finalizable
4544 if (!_has_empty_finalizer) {
4545 if (_has_finalizer ||
4546 (super != NULL && super->has_finalizer())) {
4547 ik->set_has_finalizer();
4548 }
4549 }
4550
4551 #ifdef ASSERT
4552 bool f = false;
4553 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4554 vmSymbols::void_method_signature());
4555 if (m != NULL && !m->is_empty_method()) {
4556 f = true;
4557 }
4558
4559 // Spec doesn't prevent agent from redefinition of empty finalizer.
4560 // Despite the fact that it's generally bad idea and redefined finalizer
4561 // will not work as expected we shouldn't abort vm in this case
4562 if (!ik->has_redefined_this_or_super()) {
4563 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4564 }
4565 #endif
4566
4567 // Check if this klass supports the java.lang.Cloneable interface
4568 if (SystemDictionary::Cloneable_klass_loaded()) {
4569 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4570 ik->set_is_cloneable();
4571 }
4572 }
4573
4574 // Check if this klass has a vanilla default constructor
4575 if (super == NULL) {
4576 // java.lang.Object has empty default constructor
4577 ik->set_has_vanilla_constructor();
4578 } else {
4579 if (super->has_vanilla_constructor() &&
4580 _has_vanilla_constructor) {
4581 ik->set_has_vanilla_constructor();
4582 }
4583 #ifdef ASSERT
4584 bool v = false;
4585 if (super->has_vanilla_constructor()) {
4586 const Method* const constructor =
4587 ik->find_method(vmSymbols::object_initializer_name(),
4588 vmSymbols::void_method_signature());
4589 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4590 v = true;
4591 }
4592 }
4593 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4594 #endif
4595 }
4596
4597 // If it cannot be fast-path allocated, set a bit in the layout helper.
4598 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4599 assert(ik->size_helper() > 0, "layout_helper is initialized");
4600 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4601 || ik->is_abstract() || ik->is_interface()
4602 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4603 || ik->size_helper() >= FastAllocateSizeLimit) {
4604 // Forbid fast-path allocation.
4605 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4606 ik->set_layout_helper(lh);
4607 }
4608 }
4609
4610 // utility methods for appending an array with check for duplicates
4611
4612 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4613 const Array<InstanceKlass*>* const ifs) {
4614 // iterate over new interfaces
4615 for (int i = 0; i < ifs->length(); i++) {
4616 InstanceKlass* const e = ifs->at(i);
4617 assert(e->is_klass() && e->is_interface(), "just checking");
4618 // add new interface
4619 result->append_if_missing(e);
4620 }
4621 }
4622
4623 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4624 Array<InstanceKlass*>* local_ifs,
4625 ClassLoaderData* loader_data,
4626 TRAPS) {
4627 assert(local_ifs != NULL, "invariant");
4628 assert(loader_data != NULL, "invariant");
4629
4630 // Compute maximum size for transitive interfaces
4631 int max_transitive_size = 0;
4632 int super_size = 0;
4633 // Add superclass transitive interfaces size
4634 if (super != NULL) {
4635 super_size = super->transitive_interfaces()->length();
4636 max_transitive_size += super_size;
4637 }
4638 // Add local interfaces' super interfaces
4639 const int local_size = local_ifs->length();
4640 for (int i = 0; i < local_size; i++) {
4641 InstanceKlass* const l = local_ifs->at(i);
4642 max_transitive_size += l->transitive_interfaces()->length();
4643 }
4644 // Finally add local interfaces
4645 max_transitive_size += local_size;
4646 // Construct array
4647 if (max_transitive_size == 0) {
4648 // no interfaces, use canonicalized array
4649 return Universe::the_empty_instance_klass_array();
4650 } else if (max_transitive_size == super_size) {
4651 // no new local interfaces added, share superklass' transitive interface array
4652 return super->transitive_interfaces();
4653 } else if (max_transitive_size == local_size) {
4654 // only local interfaces added, share local interface array
4655 return local_ifs;
4656 } else {
4657 ResourceMark rm;
4658 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4659
4660 // Copy down from superclass
4661 if (super != NULL) {
4662 append_interfaces(result, super->transitive_interfaces());
4663 }
4664
4665 // Copy down from local interfaces' superinterfaces
4666 for (int i = 0; i < local_size; i++) {
4667 InstanceKlass* const l = local_ifs->at(i);
4668 append_interfaces(result, l->transitive_interfaces());
4669 }
4670 // Finally add local interfaces
4671 append_interfaces(result, local_ifs);
4672
4673 // length will be less than the max_transitive_size if duplicates were removed
4674 const int length = result->length();
4675 assert(length <= max_transitive_size, "just checking");
4676 Array<InstanceKlass*>* const new_result =
4677 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4678 for (int i = 0; i < length; i++) {
4679 InstanceKlass* const e = result->at(i);
4680 assert(e != NULL, "just checking");
4681 new_result->at_put(i, e);
4682 }
4683 return new_result;
4684 }
4685 }
4686
4687 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4688 assert(this_klass != NULL, "invariant");
4689 const Klass* const super = this_klass->super();
4690
4691 if (super != NULL) {
4692
4693 // If the loader is not the boot loader then throw an exception if its
4694 // superclass is in package jdk.internal.reflect and its loader is not a
4695 // special reflection class loader
4696 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4697 assert(super->is_instance_klass(), "super is not instance klass");
4698 PackageEntry* super_package = super->package();
4699 if (super_package != NULL &&
4700 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4701 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4702 ResourceMark rm(THREAD);
4703 Exceptions::fthrow(
4704 THREAD_AND_LOCATION,
4705 vmSymbols::java_lang_IllegalAccessError(),
4706 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4707 this_klass->external_name(),
4708 this_klass->class_loader_data()->loader_name_and_id(),
4709 super->external_name());
4710 return;
4711 }
4712 }
4713
4714 Reflection::VerifyClassAccessResults vca_result =
4715 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4716 if (vca_result != Reflection::ACCESS_OK) {
4717 ResourceMark rm(THREAD);
4718 char* msg = Reflection::verify_class_access_msg(this_klass,
4719 InstanceKlass::cast(super),
4720 vca_result);
4721 if (msg == NULL) {
4722 bool same_module = (this_klass->module() == super->module());
4723 Exceptions::fthrow(
4724 THREAD_AND_LOCATION,
4725 vmSymbols::java_lang_IllegalAccessError(),
4726 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4727 this_klass->external_name(),
4728 super->is_abstract() ? "abstract " : "",
4729 super->external_name(),
4730 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4731 (same_module) ? "" : "; ",
4732 (same_module) ? "" : super->class_in_module_of_loader());
4733 } else {
4734 // Add additional message content.
4735 Exceptions::fthrow(
4736 THREAD_AND_LOCATION,
4737 vmSymbols::java_lang_IllegalAccessError(),
4738 "superclass access check failed: %s",
4739 msg);
4740 }
4741 }
4742 }
4743 }
4744
4745
4746 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4747 assert(this_klass != NULL, "invariant");
4748 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4749 const int lng = local_interfaces->length();
4750 for (int i = lng - 1; i >= 0; i--) {
4751 InstanceKlass* const k = local_interfaces->at(i);
4752 assert (k != NULL && k->is_interface(), "invalid interface");
4753 Reflection::VerifyClassAccessResults vca_result =
4754 Reflection::verify_class_access(this_klass, k, false);
4755 if (vca_result != Reflection::ACCESS_OK) {
4756 ResourceMark rm(THREAD);
4757 char* msg = Reflection::verify_class_access_msg(this_klass,
4758 k,
4759 vca_result);
4760 if (msg == NULL) {
4761 bool same_module = (this_klass->module() == k->module());
4762 Exceptions::fthrow(
4763 THREAD_AND_LOCATION,
4764 vmSymbols::java_lang_IllegalAccessError(),
4765 "class %s cannot access its superinterface %s (%s%s%s)",
4766 this_klass->external_name(),
4767 k->external_name(),
4768 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4769 (same_module) ? "" : "; ",
4770 (same_module) ? "" : k->class_in_module_of_loader());
4771 } else {
4772 // Add additional message content.
4773 Exceptions::fthrow(
4774 THREAD_AND_LOCATION,
4775 vmSymbols::java_lang_IllegalAccessError(),
4776 "superinterface check failed: %s",
4777 msg);
4778 }
4779 }
4780 }
4781 }
4782
4783
4784 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4785 assert(this_klass != NULL, "invariant");
4786 const Array<Method*>* const methods = this_klass->methods();
4787 const int num_methods = methods->length();
4788
4789 // go thru each method and check if it overrides a final method
4790 for (int index = 0; index < num_methods; index++) {
4791 const Method* const m = methods->at(index);
4792
4793 // skip private, static, and <init> methods
4794 if ((!m->is_private() && !m->is_static()) &&
4795 (m->name() != vmSymbols::object_initializer_name())) {
4796
4797 const Symbol* const name = m->name();
4798 const Symbol* const signature = m->signature();
4799 const Klass* k = this_klass->super();
4800 const Method* super_m = NULL;
4801 while (k != NULL) {
4802 // skip supers that don't have final methods.
4803 if (k->has_final_method()) {
4804 // lookup a matching method in the super class hierarchy
4805 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4806 if (super_m == NULL) {
4807 break; // didn't find any match; get out
4808 }
4809
4810 if (super_m->is_final() && !super_m->is_static() &&
4811 !super_m->access_flags().is_private()) {
4812 // matching method in super is final, and not static or private
4813 bool can_access = Reflection::verify_member_access(this_klass,
4814 super_m->method_holder(),
4815 super_m->method_holder(),
4816 super_m->access_flags(),
4817 false, false, CHECK);
4818 if (can_access) {
4819 // this class can access super final method and therefore override
4820 ResourceMark rm(THREAD);
4821 Exceptions::fthrow(THREAD_AND_LOCATION,
4822 vmSymbols::java_lang_VerifyError(),
4823 "class %s overrides final method %s.%s%s",
4824 this_klass->external_name(),
4825 super_m->method_holder()->external_name(),
4826 name->as_C_string(),
4827 signature->as_C_string()
4828 );
4829 return;
4830 }
4831 }
4832
4833 // continue to look from super_m's holder's super.
4834 k = super_m->method_holder()->super();
4835 continue;
4836 }
4837
4838 k = k->super();
4839 }
4840 }
4841 }
4842 }
4843
4844
4845 // assumes that this_klass is an interface
4846 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4847 assert(this_klass != NULL, "invariant");
4848 assert(this_klass->is_interface(), "not an interface");
4849 const Array<Method*>* methods = this_klass->methods();
4850 const int num_methods = methods->length();
4851
4852 for (int index = 0; index < num_methods; index++) {
4853 const Method* const m = methods->at(index);
4854 // if m is static and not the init method, throw a verify error
4855 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4856 ResourceMark rm(THREAD);
4857 Exceptions::fthrow(
4858 THREAD_AND_LOCATION,
4859 vmSymbols::java_lang_VerifyError(),
4860 "Illegal static method %s in interface %s",
4861 m->name()->as_C_string(),
4862 this_klass->external_name()
4863 );
4864 return;
4865 }
4866 }
4867 }
4868
4869 // utility methods for format checking
4870
4871 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4872 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4873 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4874 if (is_module) {
4875 ResourceMark rm(THREAD);
4876 Exceptions::fthrow(
4877 THREAD_AND_LOCATION,
4878 vmSymbols::java_lang_NoClassDefFoundError(),
4879 "%s is not a class because access_flag ACC_MODULE is set",
4880 _class_name->as_C_string());
4881 return;
4882 }
4883
4884 if (!_need_verify) { return; }
4885
4886 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4887 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4888 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4889 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4890 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4891 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4892 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4893 const bool major_gte_14 = _major_version >= JAVA_14_VERSION;
4894
4895 if ((is_abstract && is_final) ||
4896 (is_interface && !is_abstract) ||
4897 (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
4898 (!is_interface && major_gte_1_5 && is_annotation)) {
4899 ResourceMark rm(THREAD);
4900 Exceptions::fthrow(
4901 THREAD_AND_LOCATION,
4902 vmSymbols::java_lang_ClassFormatError(),
4903 "Illegal class modifiers in class %s: 0x%X",
4904 _class_name->as_C_string(), flags
4905 );
4906 return;
4907 }
4908 }
4909
4910 static bool has_illegal_visibility(jint flags) {
4911 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4912 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4913 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4914
4915 return ((is_public && is_protected) ||
4916 (is_public && is_private) ||
4917 (is_protected && is_private));
4918 }
4919
4920 // A legal major_version.minor_version must be one of the following:
4921 //
4922 // Major_version >= 45 and major_version < 56, any minor_version.
4923 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4924 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4925 //
4926 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4927 ResourceMark rm(THREAD);
4928 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4929 if (major < JAVA_MIN_SUPPORTED_VERSION) {
4930 Exceptions::fthrow(
4931 THREAD_AND_LOCATION,
4932 vmSymbols::java_lang_UnsupportedClassVersionError(),
4933 "%s (class file version %u.%u) was compiled with an invalid major version",
4934 class_name->as_C_string(), major, minor);
4935 return;
4936 }
4937
4938 if (major > max_version) {
4939 Exceptions::fthrow(
4940 THREAD_AND_LOCATION,
4941 vmSymbols::java_lang_UnsupportedClassVersionError(),
4942 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4943 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4944 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4945 return;
4946 }
4947
4948 if (major < JAVA_12_VERSION || minor == 0) {
4949 return;
4950 }
4951
4952 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4953 if (major != max_version) {
4954 Exceptions::fthrow(
4955 THREAD_AND_LOCATION,
4956 vmSymbols::java_lang_UnsupportedClassVersionError(),
4957 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4958 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4959 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4960 return;
4961 }
4962
4963 if (!Arguments::enable_preview()) {
4964 Exceptions::fthrow(
4965 THREAD_AND_LOCATION,
4966 vmSymbols::java_lang_UnsupportedClassVersionError(),
4967 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4968 class_name->as_C_string(), major, minor);
4969 return;
4970 }
4971
4972 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4973 Exceptions::fthrow(
4974 THREAD_AND_LOCATION,
4975 vmSymbols::java_lang_UnsupportedClassVersionError(),
4976 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4977 class_name->as_C_string(), major, minor);
4978 }
4979 }
4980
4981 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4982 bool is_interface,
4983 TRAPS) const {
4984 if (!_need_verify) { return; }
4985
4986 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4987 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4988 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4989 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4990 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4991 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4992 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4993 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4994 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4995
4996 bool is_illegal = false;
4997
4998 if (is_interface) {
4999 if (!is_public || !is_static || !is_final || is_private ||
5000 is_protected || is_volatile || is_transient ||
5001 (major_gte_1_5 && is_enum)) {
5002 is_illegal = true;
5003 }
5004 } else { // not interface
5005 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
5006 is_illegal = true;
5007 }
5008 }
5009
5010 if (is_illegal) {
5011 ResourceMark rm(THREAD);
5012 Exceptions::fthrow(
5013 THREAD_AND_LOCATION,
5014 vmSymbols::java_lang_ClassFormatError(),
5015 "Illegal field modifiers in class %s: 0x%X",
5016 _class_name->as_C_string(), flags);
5017 return;
5018 }
5019 }
5020
5021 void ClassFileParser::verify_legal_method_modifiers(jint flags,
5022 bool is_interface,
5023 const Symbol* name,
5024 TRAPS) const {
5025 if (!_need_verify) { return; }
5026
5027 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5028 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5029 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5030 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5031 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
5032 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5033 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
5034 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
5035 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
5036 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5037 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
5038 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
5039 const bool is_initializer = (name == vmSymbols::object_initializer_name());
5040
5041 bool is_illegal = false;
5042
5043 if (is_interface) {
5044 if (major_gte_8) {
5045 // Class file version is JAVA_8_VERSION or later Methods of
5046 // interfaces may set any of the flags except ACC_PROTECTED,
5047 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5048 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5049 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5050 (is_native || is_protected || is_final || is_synchronized) ||
5051 // If a specific method of a class or interface has its
5052 // ACC_ABSTRACT flag set, it must not have any of its
5053 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5054 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
5055 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5056 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5057 (is_abstract && (is_private || is_static || is_strict))) {
5058 is_illegal = true;
5059 }
5060 } else if (major_gte_1_5) {
5061 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5062 if (!is_public || is_private || is_protected || is_static || is_final ||
5063 is_synchronized || is_native || !is_abstract || is_strict) {
5064 is_illegal = true;
5065 }
5066 } else {
5067 // Class file version is pre-JAVA_1_5_VERSION
5068 if (!is_public || is_static || is_final || is_native || !is_abstract) {
5069 is_illegal = true;
5070 }
5071 }
5072 } else { // not interface
5073 if (has_illegal_visibility(flags)) {
5074 is_illegal = true;
5075 } else {
5076 if (is_initializer) {
5077 if (is_static || is_final || is_synchronized || is_native ||
5078 is_abstract || (major_gte_1_5 && is_bridge)) {
5079 is_illegal = true;
5080 }
5081 } else { // not initializer
5082 if (is_abstract) {
5083 if ((is_final || is_native || is_private || is_static ||
5084 (major_gte_1_5 && (is_synchronized || is_strict)))) {
5085 is_illegal = true;
5086 }
5087 }
5088 }
5089 }
5090 }
5091
5092 if (is_illegal) {
5093 ResourceMark rm(THREAD);
5094 Exceptions::fthrow(
5095 THREAD_AND_LOCATION,
5096 vmSymbols::java_lang_ClassFormatError(),
5097 "Method %s in class %s has illegal modifiers: 0x%X",
5098 name->as_C_string(), _class_name->as_C_string(), flags);
5099 return;
5100 }
5101 }
5102
5103 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5104 int length,
5105 TRAPS) const {
5106 assert(_need_verify, "only called when _need_verify is true");
5107 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5108 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5109 }
5110 }
5111
5112 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5113 // In class names, '/' separates unqualified names. This is verified in this function also.
5114 // Method names also may not contain the characters '<' or '>', unless <init>
5115 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5116 // method. Because these names have been checked as special cases before
5117 // calling this method in verify_legal_method_name.
5118 //
5119 // This method is also called from the modular system APIs in modules.cpp
5120 // to verify the validity of module and package names.
5121 bool ClassFileParser::verify_unqualified_name(const char* name,
5122 unsigned int length,
5123 int type) {
5124 if (length == 0) return false; // Must have at least one char.
5125 for (const char* p = name; p != name + length; p++) {
5126 switch(*p) {
5127 case JVM_SIGNATURE_DOT:
5128 case JVM_SIGNATURE_ENDCLASS:
5129 case JVM_SIGNATURE_ARRAY:
5130 // do not permit '.', ';', or '['
5131 return false;
5132 case JVM_SIGNATURE_SLASH:
5133 // check for '//' or leading or trailing '/' which are not legal
5134 // unqualified name must not be empty
5135 if (type == ClassFileParser::LegalClass) {
5136 if (p == name || p+1 >= name+length ||
5137 *(p+1) == JVM_SIGNATURE_SLASH) {
5138 return false;
5139 }
5140 } else {
5141 return false; // do not permit '/' unless it's class name
5142 }
5143 break;
5144 case JVM_SIGNATURE_SPECIAL:
5145 case JVM_SIGNATURE_ENDSPECIAL:
5146 // do not permit '<' or '>' in method names
5147 if (type == ClassFileParser::LegalMethod) {
5148 return false;
5149 }
5150 }
5151 }
5152 return true;
5153 }
5154
5155 // Take pointer to a UTF8 byte string (not NUL-terminated).
5156 // Skip over the longest part of the string that could
5157 // be taken as a fieldname. Allow '/' if slash_ok is true.
5158 // Return a pointer to just past the fieldname.
5159 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5160 // being true, we saw consecutive slashes (meaning we were looking for a
5161 // qualified path but found something that was badly-formed).
5162 static const char* skip_over_field_name(const char* const name,
5163 bool slash_ok,
5164 unsigned int length) {
5165 const char* p;
5166 jboolean last_is_slash = false;
5167 jboolean not_first_ch = false;
5168
5169 for (p = name; p != name + length; not_first_ch = true) {
5170 const char* old_p = p;
5171 jchar ch = *p;
5172 if (ch < 128) {
5173 p++;
5174 // quick check for ascii
5175 if ((ch >= 'a' && ch <= 'z') ||
5176 (ch >= 'A' && ch <= 'Z') ||
5177 (ch == '_' || ch == '$') ||
5178 (not_first_ch && ch >= '0' && ch <= '9')) {
5179 last_is_slash = false;
5180 continue;
5181 }
5182 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
5183 if (last_is_slash) {
5184 return NULL; // Don't permit consecutive slashes
5185 }
5186 last_is_slash = true;
5187 continue;
5188 }
5189 }
5190 else {
5191 jint unicode_ch;
5192 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5193 p = tmp_p;
5194 last_is_slash = false;
5195 // Check if ch is Java identifier start or is Java identifier part
5196 // 4672820: call java.lang.Character methods directly without generating separate tables.
5197 EXCEPTION_MARK;
5198 // return value
5199 JavaValue result(T_BOOLEAN);
5200 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
5201 JavaCallArguments args;
5202 args.push_int(unicode_ch);
5203
5204 if (not_first_ch) {
5205 // public static boolean isJavaIdentifierPart(char ch);
5206 JavaCalls::call_static(&result,
5207 SystemDictionary::Character_klass(),
5208 vmSymbols::isJavaIdentifierPart_name(),
5209 vmSymbols::int_bool_signature(),
5210 &args,
5211 THREAD);
5212 } else {
5213 // public static boolean isJavaIdentifierStart(char ch);
5214 JavaCalls::call_static(&result,
5215 SystemDictionary::Character_klass(),
5216 vmSymbols::isJavaIdentifierStart_name(),
5217 vmSymbols::int_bool_signature(),
5218 &args,
5219 THREAD);
5220 }
5221 if (HAS_PENDING_EXCEPTION) {
5222 CLEAR_PENDING_EXCEPTION;
5223 return NULL;
5224 }
5225 if(result.get_jboolean()) {
5226 continue;
5227 }
5228 }
5229 return (not_first_ch) ? old_p : NULL;
5230 }
5231 return (not_first_ch) ? p : NULL;
5232 }
5233
5234 // Take pointer to a UTF8 byte string (not NUL-terminated).
5235 // Skip over the longest part of the string that could
5236 // be taken as a field signature. Allow "void" if void_ok.
5237 // Return a pointer to just past the signature.
5238 // Return NULL if no legal signature is found.
5239 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5240 bool void_ok,
5241 unsigned int length,
5242 TRAPS) const {
5243 unsigned int array_dim = 0;
5244 while (length > 0) {
5245 switch (signature[0]) {
5246 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5247 case JVM_SIGNATURE_BOOLEAN:
5248 case JVM_SIGNATURE_BYTE:
5249 case JVM_SIGNATURE_CHAR:
5250 case JVM_SIGNATURE_SHORT:
5251 case JVM_SIGNATURE_INT:
5252 case JVM_SIGNATURE_FLOAT:
5253 case JVM_SIGNATURE_LONG:
5254 case JVM_SIGNATURE_DOUBLE:
5255 return signature + 1;
5256 case JVM_SIGNATURE_CLASS: {
5257 if (_major_version < JAVA_1_5_VERSION) {
5258 // Skip over the class name if one is there
5259 const char* const p = skip_over_field_name(signature + 1, true, --length);
5260
5261 // The next character better be a semicolon
5262 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
5263 return p + 1;
5264 }
5265 }
5266 else {
5267 // Skip leading 'L' and ignore first appearance of ';'
5268 signature++;
5269 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
5270 // Format check signature
5271 if (c != NULL) {
5272 int newlen = c - (char*) signature;
5273 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5274 if (!legal) {
5275 classfile_parse_error("Class name is empty or contains illegal character "
5276 "in descriptor in class file %s",
5277 CHECK_NULL);
5278 return NULL;
5279 }
5280 return signature + newlen + 1;
5281 }
5282 }
5283 return NULL;
5284 }
5285 case JVM_SIGNATURE_ARRAY:
5286 array_dim++;
5287 if (array_dim > 255) {
5288 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5289 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_NULL);
5290 }
5291 // The rest of what's there better be a legal signature
5292 signature++;
5293 length--;
5294 void_ok = false;
5295 break;
5296 default:
5297 return NULL;
5298 }
5299 }
5300 return NULL;
5301 }
5302
5303 // Checks if name is a legal class name.
5304 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5305 if (!_need_verify || _relax_verify) { return; }
5306
5307 assert(name->refcount() > 0, "symbol must be kept alive");
5308 char* bytes = (char*)name->bytes();
5309 unsigned int length = name->utf8_length();
5310 bool legal = false;
5311
5312 if (length > 0) {
5313 const char* p;
5314 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5315 p = skip_over_field_signature(bytes, false, length, CHECK);
5316 legal = (p != NULL) && ((p - bytes) == (int)length);
5317 } else if (_major_version < JAVA_1_5_VERSION) {
5318 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5319 p = skip_over_field_name(bytes, true, length);
5320 legal = (p != NULL) && ((p - bytes) == (int)length);
5321 }
5322 } else {
5323 // 4900761: relax the constraints based on JSR202 spec
5324 // Class names may be drawn from the entire Unicode character set.
5325 // Identifiers between '/' must be unqualified names.
5326 // The utf8 string has been verified when parsing cpool entries.
5327 legal = verify_unqualified_name(bytes, length, LegalClass);
5328 }
5329 }
5330 if (!legal) {
5331 ResourceMark rm(THREAD);
5332 assert(_class_name != NULL, "invariant");
5333 Exceptions::fthrow(
5334 THREAD_AND_LOCATION,
5335 vmSymbols::java_lang_ClassFormatError(),
5336 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5337 _class_name->as_C_string()
5338 );
5339 return;
5340 }
5341 }
5342
5343 // Checks if name is a legal field name.
5344 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5345 if (!_need_verify || _relax_verify) { return; }
5346
5347 char* bytes = (char*)name->bytes();
5348 unsigned int length = name->utf8_length();
5349 bool legal = false;
5350
5351 if (length > 0) {
5352 if (_major_version < JAVA_1_5_VERSION) {
5353 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5354 const char* p = skip_over_field_name(bytes, false, length);
5355 legal = (p != NULL) && ((p - bytes) == (int)length);
5356 }
5357 } else {
5358 // 4881221: relax the constraints based on JSR202 spec
5359 legal = verify_unqualified_name(bytes, length, LegalField);
5360 }
5361 }
5362
5363 if (!legal) {
5364 ResourceMark rm(THREAD);
5365 assert(_class_name != NULL, "invariant");
5366 Exceptions::fthrow(
5367 THREAD_AND_LOCATION,
5368 vmSymbols::java_lang_ClassFormatError(),
5369 "Illegal field name \"%.*s\" in class %s", length, bytes,
5370 _class_name->as_C_string()
5371 );
5372 return;
5373 }
5374 }
5375
5376 // Checks if name is a legal method name.
5377 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5378 if (!_need_verify || _relax_verify) { return; }
5379
5380 assert(name != NULL, "method name is null");
5381 char* bytes = (char*)name->bytes();
5382 unsigned int length = name->utf8_length();
5383 bool legal = false;
5384
5385 if (length > 0) {
5386 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5387 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5388 legal = true;
5389 }
5390 } else if (_major_version < JAVA_1_5_VERSION) {
5391 const char* p;
5392 p = skip_over_field_name(bytes, false, length);
5393 legal = (p != NULL) && ((p - bytes) == (int)length);
5394 } else {
5395 // 4881221: relax the constraints based on JSR202 spec
5396 legal = verify_unqualified_name(bytes, length, LegalMethod);
5397 }
5398 }
5399
5400 if (!legal) {
5401 ResourceMark rm(THREAD);
5402 assert(_class_name != NULL, "invariant");
5403 Exceptions::fthrow(
5404 THREAD_AND_LOCATION,
5405 vmSymbols::java_lang_ClassFormatError(),
5406 "Illegal method name \"%.*s\" in class %s", length, bytes,
5407 _class_name->as_C_string()
5408 );
5409 return;
5410 }
5411 }
5412
5413
5414 // Checks if signature is a legal field signature.
5415 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5416 const Symbol* signature,
5417 TRAPS) const {
5418 if (!_need_verify) { return; }
5419
5420 const char* const bytes = (const char* const)signature->bytes();
5421 const unsigned int length = signature->utf8_length();
5422 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5423
5424 if (p == NULL || (p - bytes) != (int)length) {
5425 throwIllegalSignature("Field", name, signature, CHECK);
5426 }
5427 }
5428
5429 // Checks if signature is a legal method signature.
5430 // Returns number of parameters
5431 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5432 const Symbol* signature,
5433 TRAPS) const {
5434 if (!_need_verify) {
5435 // make sure caller's args_size will be less than 0 even for non-static
5436 // method so it will be recomputed in compute_size_of_parameters().
5437 return -2;
5438 }
5439
5440 // Class initializers cannot have args for class format version >= 51.
5441 if (name == vmSymbols::class_initializer_name() &&
5442 signature != vmSymbols::void_method_signature() &&
5443 _major_version >= JAVA_7_VERSION) {
5444 throwIllegalSignature("Method", name, signature, CHECK_0);
5445 return 0;
5446 }
5447
5448 unsigned int args_size = 0;
5449 const char* p = (const char*)signature->bytes();
5450 unsigned int length = signature->utf8_length();
5451 const char* nextp;
5452
5453 // The first character must be a '('
5454 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5455 length--;
5456 // Skip over legal field signatures
5457 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5458 while ((length > 0) && (nextp != NULL)) {
5459 args_size++;
5460 if (p[0] == 'J' || p[0] == 'D') {
5461 args_size++;
5462 }
5463 length -= nextp - p;
5464 p = nextp;
5465 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5466 }
5467 // The first non-signature thing better be a ')'
5468 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5469 length--;
5470 if (name->utf8_length() > 0 && name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
5471 // All internal methods must return void
5472 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5473 return args_size;
5474 }
5475 } else {
5476 // Now we better just have a return value
5477 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5478 if (nextp && ((int)length == (nextp - p))) {
5479 return args_size;
5480 }
5481 }
5482 }
5483 }
5484 // Report error
5485 throwIllegalSignature("Method", name, signature, CHECK_0);
5486 return 0;
5487 }
5488
5489 int ClassFileParser::static_field_size() const {
5490 assert(_field_info != NULL, "invariant");
5491 return _field_info->_static_field_size;
5492 }
5493
5494 int ClassFileParser::total_oop_map_count() const {
5495 assert(_field_info != NULL, "invariant");
5496 return _field_info->oop_map_blocks->_nonstatic_oop_map_count;
5497 }
5498
5499 jint ClassFileParser::layout_size() const {
5500 assert(_field_info != NULL, "invariant");
5501 return _field_info->_instance_size;
5502 }
5503
5504 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5505 const Array<Method*>* methods) {
5506 assert(ik != NULL, "invariant");
5507 assert(methods != NULL, "invariant");
5508
5509 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5510 // (We used to do this lazily, but now we query it in Rewriter,
5511 // which is eagerly done for every method, so we might as well do it now,
5512 // when everything is fresh in memory.)
5513 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5514
5515 if (klass_id != vmSymbols::NO_SID) {
5516 for (int j = 0; j < methods->length(); ++j) {
5517 Method* method = methods->at(j);
5518 method->init_intrinsic_id();
5519
5520 if (CheckIntrinsics) {
5521 // Check if an intrinsic is defined for method 'method',
5522 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5523 if (method->intrinsic_id() != vmIntrinsics::_none &&
5524 !method->intrinsic_candidate()) {
5525 tty->print("Compiler intrinsic is defined for method [%s], "
5526 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5527 method->name_and_sig_as_C_string(),
5528 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5529 );
5530 tty->cr();
5531 DEBUG_ONLY(vm_exit(1));
5532 }
5533 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5534 // but there is no intrinsic available for it.
5535 if (method->intrinsic_candidate() &&
5536 method->intrinsic_id() == vmIntrinsics::_none) {
5537 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5538 "but no compiler intrinsic is defined for the method.%s",
5539 method->name_and_sig_as_C_string(),
5540 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5541 );
5542 tty->cr();
5543 DEBUG_ONLY(vm_exit(1));
5544 }
5545 }
5546 } // end for
5547
5548 #ifdef ASSERT
5549 if (CheckIntrinsics) {
5550 // Check for orphan methods in the current class. A method m
5551 // of a class C is orphan if an intrinsic is defined for method m,
5552 // but class C does not declare m.
5553 // The check is potentially expensive, therefore it is available
5554 // only in debug builds.
5555
5556 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5557 if (vmIntrinsics::_compiledLambdaForm == id) {
5558 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5559 // generated for the JVM from a LambdaForm and therefore no method
5560 // is defined for it.
5561 continue;
5562 }
5563
5564 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5565 // Check if the current class contains a method with the same
5566 // name, flags, signature.
5567 bool match = false;
5568 for (int j = 0; j < methods->length(); ++j) {
5569 const Method* method = methods->at(j);
5570 if (method->intrinsic_id() == id) {
5571 match = true;
5572 break;
5573 }
5574 }
5575
5576 if (!match) {
5577 char buf[1000];
5578 tty->print("Compiler intrinsic is defined for method [%s], "
5579 "but the method is not available in class [%s].%s",
5580 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5581 buf, sizeof(buf)),
5582 ik->name()->as_C_string(),
5583 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5584 );
5585 tty->cr();
5586 DEBUG_ONLY(vm_exit(1));
5587 }
5588 }
5589 } // end for
5590 } // CheckIntrinsics
5591 #endif // ASSERT
5592 }
5593 }
5594
5595 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5596 if (_klass != NULL) {
5597 return _klass;
5598 }
5599
5600 InstanceKlass* const ik =
5601 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5602
5603 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5604
5605 assert(_klass == ik, "invariant");
5606
5607
5608 if (ik->should_store_fingerprint()) {
5609 ik->store_fingerprint(_stream->compute_fingerprint());
5610 }
5611
5612 ik->set_has_passed_fingerprint_check(false);
5613 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5614 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5615 uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint();
5616 if (aot_fp != 0 && aot_fp == fp) {
5617 // This class matches with a class saved in an AOT library
5618 ik->set_has_passed_fingerprint_check(true);
5619 } else {
5620 ResourceMark rm;
5621 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5622 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5623 }
5624 }
5625
5626 return ik;
5627 }
5628
5629 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5630 assert(ik != NULL, "invariant");
5631
5632 // Set name and CLD before adding to CLD
5633 ik->set_class_loader_data(_loader_data);
5634 ik->set_name(_class_name);
5635
5636 // Add all classes to our internal class loader list here,
5637 // including classes in the bootstrap (NULL) class loader.
5638 const bool publicize = !is_internal();
5639
5640 _loader_data->add_class(ik, publicize);
5641
5642 set_klass_to_deallocate(ik);
5643
5644 assert(_field_info != NULL, "invariant");
5645 assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5646 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5647 "sanity");
5648
5649 assert(ik->is_instance_klass(), "sanity");
5650 assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5651
5652 // Fill in information already parsed
5653 ik->set_should_verify_class(_need_verify);
5654
5655 // Not yet: supers are done below to support the new subtype-checking fields
5656 ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5657 ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5658 assert(_fac != NULL, "invariant");
5659 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5660
5661 // this transfers ownership of a lot of arrays from
5662 // the parser onto the InstanceKlass*
5663 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5664
5665 // note that is not safe to use the fields in the parser from this point on
5666 assert(NULL == _cp, "invariant");
5667 assert(NULL == _fields, "invariant");
5668 assert(NULL == _methods, "invariant");
5669 assert(NULL == _inner_classes, "invariant");
5670 assert(NULL == _nest_members, "invariant");
5671 assert(NULL == _local_interfaces, "invariant");
5672 assert(NULL == _combined_annotations, "invariant");
5673 assert(NULL == _record_components, "invariant");
5674
5675 if (_has_final_method) {
5676 ik->set_has_final_method();
5677 }
5678
5679 ik->copy_method_ordering(_method_ordering, CHECK);
5680 // The InstanceKlass::_methods_jmethod_ids cache
5681 // is managed on the assumption that the initial cache
5682 // size is equal to the number of methods in the class. If
5683 // that changes, then InstanceKlass::idnum_can_increment()
5684 // has to be changed accordingly.
5685 ik->set_initial_method_idnum(ik->methods()->length());
5686
5687 ik->set_this_class_index(_this_class_index);
5688
5689 if (is_unsafe_anonymous()) {
5690 // _this_class_index is a CONSTANT_Class entry that refers to this
5691 // anonymous class itself. If this class needs to refer to its own methods or
5692 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5693 // _this_class_index. However, because this class is anonymous (it's
5694 // not stored in SystemDictionary), _this_class_index cannot be resolved
5695 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5696 // Therefore, we must eagerly resolve _this_class_index now.
5697 ik->constants()->klass_at_put(_this_class_index, ik);
5698 }
5699
5700 ik->set_minor_version(_minor_version);
5701 ik->set_major_version(_major_version);
5702 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5703 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5704
5705 if (_unsafe_anonymous_host != NULL) {
5706 assert (ik->is_unsafe_anonymous(), "should be the same");
5707 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host);
5708 }
5709
5710 // Set PackageEntry for this_klass
5711 oop cl = ik->class_loader();
5712 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5713 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5714 ik->set_package(cld, CHECK);
5715
5716 const Array<Method*>* const methods = ik->methods();
5717 assert(methods != NULL, "invariant");
5718 const int methods_len = methods->length();
5719
5720 check_methods_for_intrinsics(ik, methods);
5721
5722 // Fill in field values obtained by parse_classfile_attributes
5723 if (_parsed_annotations->has_any_annotations()) {
5724 _parsed_annotations->apply_to(ik);
5725 }
5726
5727 apply_parsed_class_attributes(ik);
5728
5729 // Miranda methods
5730 if ((_num_miranda_methods > 0) ||
5731 // if this class introduced new miranda methods or
5732 (_super_klass != NULL && _super_klass->has_miranda_methods())
5733 // super class exists and this class inherited miranda methods
5734 ) {
5735 ik->set_has_miranda_methods(); // then set a flag
5736 }
5737
5738 // Fill in information needed to compute superclasses.
5739 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5740 ik->set_transitive_interfaces(_transitive_interfaces);
5741 _transitive_interfaces = NULL;
5742
5743 // Initialize itable offset tables
5744 klassItable::setup_itable_offset_table(ik);
5745
5746 // Compute transitive closure of interfaces this class implements
5747 // Do final class setup
5748 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5749 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5750 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5751 }
5752
5753 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5754 ( _super_klass != NULL && _super_klass->has_contended_annotations())) {
5755 ik->set_has_contended_annotations(true);
5756 }
5757
5758 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5759 set_precomputed_flags(ik);
5760
5761 // check if this class can access its super class
5762 check_super_class_access(ik, CHECK);
5763
5764 // check if this class can access its superinterfaces
5765 check_super_interface_access(ik, CHECK);
5766
5767 // check if this class overrides any final method
5768 check_final_method_override(ik, CHECK);
5769
5770 // reject static interface methods prior to Java 8
5771 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5772 check_illegal_static_method(ik, CHECK);
5773 }
5774
5775 // Obtain this_klass' module entry
5776 ModuleEntry* module_entry = ik->module();
5777 assert(module_entry != NULL, "module_entry should always be set");
5778
5779 // Obtain java.lang.Module
5780 Handle module_handle(THREAD, module_entry->module());
5781
5782 // Allocate mirror and initialize static fields
5783 // The create_mirror() call will also call compute_modifiers()
5784 java_lang_Class::create_mirror(ik,
5785 Handle(THREAD, _loader_data->class_loader()),
5786 module_handle,
5787 _protection_domain,
5788 CHECK);
5789
5790 assert(_all_mirandas != NULL, "invariant");
5791
5792 // Generate any default methods - default methods are public interface methods
5793 // that have a default implementation. This is new with Java 8.
5794 if (_has_nonstatic_concrete_methods) {
5795 DefaultMethods::generate_default_methods(ik,
5796 _all_mirandas,
5797 CHECK);
5798 }
5799
5800 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5801 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5802 !module_entry->has_default_read_edges()) {
5803 if (!module_entry->set_has_default_read_edges()) {
5804 // We won a potential race
5805 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5806 }
5807 }
5808
5809 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5810
5811 if (!is_internal()) {
5812 if (log_is_enabled(Info, class, load)) {
5813 ResourceMark rm;
5814 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5815 ik->print_class_load_logging(_loader_data, module_name, _stream);
5816 }
5817
5818 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5819 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5820 log_is_enabled(Info, class, preview)) {
5821 ResourceMark rm;
5822 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5823 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5824 }
5825
5826 if (log_is_enabled(Debug, class, resolve)) {
5827 ResourceMark rm;
5828 // print out the superclass.
5829 const char * from = ik->external_name();
5830 if (ik->java_super() != NULL) {
5831 log_debug(class, resolve)("%s %s (super)",
5832 from,
5833 ik->java_super()->external_name());
5834 }
5835 // print out each of the interface classes referred to by this class.
5836 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5837 if (local_interfaces != NULL) {
5838 const int length = local_interfaces->length();
5839 for (int i = 0; i < length; i++) {
5840 const InstanceKlass* const k = local_interfaces->at(i);
5841 const char * to = k->external_name();
5842 log_debug(class, resolve)("%s %s (interface)", from, to);
5843 }
5844 }
5845 }
5846 }
5847
5848 JFR_ONLY(INIT_ID(ik);)
5849
5850 // If we reach here, all is well.
5851 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5852 // in order for it to not be destroyed in the ClassFileParser destructor.
5853 set_klass_to_deallocate(NULL);
5854
5855 // it's official
5856 set_klass(ik);
5857
5858 debug_only(ik->verify();)
5859 }
5860
5861 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5862 // Decrement the refcount in the old name, since we're clobbering it.
5863 _class_name->decrement_refcount();
5864
5865 _class_name = new_class_name;
5866 // Increment the refcount of the new name.
5867 // Now the ClassFileParser owns this name and will decrement in
5868 // the destructor.
5869 _class_name->increment_refcount();
5870 }
5871
5872
5873 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's
5874 // package by prepending its host class's package name to its class name and setting
5875 // its _class_name field.
5876 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) {
5877 ResourceMark rm(THREAD);
5878 assert(strrchr(_class_name->as_C_string(), JVM_SIGNATURE_SLASH) == NULL,
5879 "Unsafe anonymous class should not be in a package");
5880 TempNewSymbol host_pkg_name =
5881 ClassLoader::package_from_class_name(unsafe_anonymous_host->name());
5882
5883 if (host_pkg_name != NULL) {
5884 int host_pkg_len = host_pkg_name->utf8_length();
5885 int class_name_len = _class_name->utf8_length();
5886 int symbol_len = host_pkg_len + 1 + class_name_len;
5887 char* new_anon_name = NEW_RESOURCE_ARRAY(char, symbol_len + 1);
5888 int n = os::snprintf(new_anon_name, symbol_len + 1, "%.*s/%.*s",
5889 host_pkg_len, host_pkg_name->base(), class_name_len, _class_name->base());
5890 assert(n == symbol_len, "Unexpected number of characters in string");
5891
5892 // Decrement old _class_name to avoid leaking.
5893 _class_name->decrement_refcount();
5894
5895 // Create a symbol and update the anonymous class name.
5896 // The new class name is created with a refcount of one. When installed into the InstanceKlass,
5897 // it'll be two and when the ClassFileParser destructor runs, it'll go back to one and get deleted
5898 // when the class is unloaded.
5899 _class_name = SymbolTable::new_symbol(new_anon_name, symbol_len);
5900 }
5901 }
5902
5903 // If the host class and the anonymous class are in the same package then do
5904 // nothing. If the anonymous class is in the unnamed package then move it to its
5905 // host's package. If the classes are in different packages then throw an IAE
5906 // exception.
5907 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) {
5908 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class");
5909
5910 const jbyte* anon_last_slash = UTF8::strrchr((const jbyte*)_class_name->base(),
5911 _class_name->utf8_length(), JVM_SIGNATURE_SLASH);
5912 if (anon_last_slash == NULL) { // Unnamed package
5913 prepend_host_package_name(_unsafe_anonymous_host, CHECK);
5914 } else {
5915 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) {
5916 ResourceMark rm(THREAD);
5917 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
5918 err_msg("Host class %s and anonymous class %s are in different packages",
5919 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string()));
5920 }
5921 }
5922 }
5923
5924 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5925 bool trusted = (loader_data->is_the_null_class_loader_data() ||
5926 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
5927 bool need_verify =
5928 // verifyAll
5929 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5930 // verifyRemote
5931 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5932 return !need_verify;
5933 }
5934
5935 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5936 Symbol* name,
5937 ClassLoaderData* loader_data,
5938 Handle protection_domain,
5939 const InstanceKlass* unsafe_anonymous_host,
5940 GrowableArray<Handle>* cp_patches,
5941 Publicity pub_level,
5942 TRAPS) :
5943 _stream(stream),
5944 _requested_name(name),
5945 _class_name(NULL),
5946 _loader_data(loader_data),
5947 _unsafe_anonymous_host(unsafe_anonymous_host),
5948 _cp_patches(cp_patches),
5949 _num_patched_klasses(0),
5950 _max_num_patched_klasses(0),
5951 _orig_cp_size(0),
5952 _first_patched_klass_resolved_index(0),
5953 _super_klass(),
5954 _cp(NULL),
5955 _fields(NULL),
5956 _methods(NULL),
5957 _inner_classes(NULL),
5958 _nest_members(NULL),
5959 _nest_host(0),
5960 _record_components(NULL),
5961 _local_interfaces(NULL),
5962 _transitive_interfaces(NULL),
5963 _combined_annotations(NULL),
5964 _class_annotations(NULL),
5965 _class_type_annotations(NULL),
5966 _fields_annotations(NULL),
5967 _fields_type_annotations(NULL),
5968 _klass(NULL),
5969 _klass_to_deallocate(NULL),
5970 _parsed_annotations(NULL),
5971 _fac(NULL),
5972 _field_info(NULL),
5973 _method_ordering(NULL),
5974 _all_mirandas(NULL),
5975 _vtable_size(0),
5976 _itable_size(0),
5977 _num_miranda_methods(0),
5978 _rt(REF_NONE),
5979 _protection_domain(protection_domain),
5980 _access_flags(),
5981 _pub_level(pub_level),
5982 _bad_constant_seen(0),
5983 _synthetic_flag(false),
5984 _sde_length(false),
5985 _sde_buffer(NULL),
5986 _sourcefile_index(0),
5987 _generic_signature_index(0),
5988 _major_version(0),
5989 _minor_version(0),
5990 _this_class_index(0),
5991 _super_class_index(0),
5992 _itfs_len(0),
5993 _java_fields_count(0),
5994 _need_verify(false),
5995 _relax_verify(false),
5996 _has_nonstatic_concrete_methods(false),
5997 _declares_nonstatic_concrete_methods(false),
5998 _has_final_method(false),
5999 _has_contended_fields(false),
6000 _has_finalizer(false),
6001 _has_empty_finalizer(false),
6002 _has_vanilla_constructor(false),
6003 _max_bootstrap_specifier_index(-1) {
6004
6005 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6006 _class_name->increment_refcount();
6007
6008 assert(THREAD->is_Java_thread(), "invariant");
6009 assert(_loader_data != NULL, "invariant");
6010 assert(stream != NULL, "invariant");
6011 assert(_stream != NULL, "invariant");
6012 assert(_stream->buffer() == _stream->current(), "invariant");
6013 assert(_class_name != NULL, "invariant");
6014 assert(0 == _access_flags.as_int(), "invariant");
6015
6016 // Figure out whether we can skip format checking (matching classic VM behavior)
6017 if (DumpSharedSpaces) {
6018 // verify == true means it's a 'remote' class (i.e., non-boot class)
6019 // Verification decision is based on BytecodeVerificationRemote flag
6020 // for those classes.
6021 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
6022 BytecodeVerificationLocal;
6023 }
6024 else {
6025 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
6026 stream->need_verify());
6027 }
6028 if (_cp_patches != NULL) {
6029 int len = _cp_patches->length();
6030 for (int i=0; i<len; i++) {
6031 if (has_cp_patch_at(i)) {
6032 Handle patch = cp_patch_at(i);
6033 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
6034 // We need to append the names of the patched classes to the end of the constant pool,
6035 // because a patched class may have a Utf8 name that's not already included in the
6036 // original constant pool. These class names are used when patch_constant_pool()
6037 // calls patch_class().
6038 //
6039 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
6040 // At this point, we don't know the tag for index i yet, because we haven't parsed the
6041 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
6042 _max_num_patched_klasses++;
6043 }
6044 }
6045 }
6046 }
6047
6048 // synch back verification state to stream
6049 stream->set_verify(_need_verify);
6050
6051 // Check if verification needs to be relaxed for this class file
6052 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
6053 _relax_verify = relax_format_check_for(_loader_data);
6054
6055 parse_stream(stream, CHECK);
6056
6057 post_process_parsed_stream(stream, _cp, CHECK);
6058 }
6059
6060 void ClassFileParser::clear_class_metadata() {
6061 // metadata created before the instance klass is created. Must be
6062 // deallocated if classfile parsing returns an error.
6063 _cp = NULL;
6064 _fields = NULL;
6065 _methods = NULL;
6066 _inner_classes = NULL;
6067 _nest_members = NULL;
6068 _local_interfaces = NULL;
6069 _combined_annotations = NULL;
6070 _class_annotations = _class_type_annotations = NULL;
6071 _fields_annotations = _fields_type_annotations = NULL;
6072 _record_components = NULL;
6073 }
6074
6075 // Destructor to clean up
6076 ClassFileParser::~ClassFileParser() {
6077 _class_name->decrement_refcount();
6078
6079 if (_cp != NULL) {
6080 MetadataFactory::free_metadata(_loader_data, _cp);
6081 }
6082 if (_fields != NULL) {
6083 MetadataFactory::free_array<u2>(_loader_data, _fields);
6084 }
6085
6086 if (_methods != NULL) {
6087 // Free methods
6088 InstanceKlass::deallocate_methods(_loader_data, _methods);
6089 }
6090
6091 // beware of the Universe::empty_blah_array!!
6092 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6093 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6094 }
6095
6096 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
6097 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6098 }
6099
6100 if (_record_components != NULL) {
6101 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
6102 }
6103
6104 // Free interfaces
6105 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6106 _local_interfaces, _transitive_interfaces);
6107
6108 if (_combined_annotations != NULL) {
6109 // After all annotations arrays have been created, they are installed into the
6110 // Annotations object that will be assigned to the InstanceKlass being created.
6111
6112 // Deallocate the Annotations object and the installed annotations arrays.
6113 _combined_annotations->deallocate_contents(_loader_data);
6114
6115 // If the _combined_annotations pointer is non-NULL,
6116 // then the other annotations fields should have been cleared.
6117 assert(_class_annotations == NULL, "Should have been cleared");
6118 assert(_class_type_annotations == NULL, "Should have been cleared");
6119 assert(_fields_annotations == NULL, "Should have been cleared");
6120 assert(_fields_type_annotations == NULL, "Should have been cleared");
6121 } else {
6122 // If the annotations arrays were not installed into the Annotations object,
6123 // then they have to be deallocated explicitly.
6124 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
6125 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
6126 Annotations::free_contents(_loader_data, _fields_annotations);
6127 Annotations::free_contents(_loader_data, _fields_type_annotations);
6128 }
6129
6130 clear_class_metadata();
6131 _transitive_interfaces = NULL;
6132
6133 // deallocate the klass if already created. Don't directly deallocate, but add
6134 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6135 // at a safepoint.
6136 if (_klass_to_deallocate != NULL) {
6137 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6138 }
6139 }
6140
6141 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6142 TRAPS) {
6143
6144 assert(stream != NULL, "invariant");
6145 assert(_class_name != NULL, "invariant");
6146
6147 // BEGIN STREAM PARSING
6148 stream->guarantee_more(8, CHECK); // magic, major, minor
6149 // Magic value
6150 const u4 magic = stream->get_u4_fast();
6151 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6152 "Incompatible magic value %u in class file %s",
6153 magic, CHECK);
6154
6155 // Version numbers
6156 _minor_version = stream->get_u2_fast();
6157 _major_version = stream->get_u2_fast();
6158
6159 if (DumpSharedSpaces && _major_version < JAVA_6_VERSION) {
6160 ResourceMark rm;
6161 warning("Pre JDK 6 class not supported by CDS: %u.%u %s",
6162 _major_version, _minor_version, _class_name->as_C_string());
6163 Exceptions::fthrow(
6164 THREAD_AND_LOCATION,
6165 vmSymbols::java_lang_UnsupportedClassVersionError(),
6166 "Unsupported major.minor version for dump time %u.%u",
6167 _major_version,
6168 _minor_version);
6169 }
6170
6171 // Check version numbers - we check this even with verifier off
6172 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6173
6174 stream->guarantee_more(3, CHECK); // length, first cp tag
6175 u2 cp_size = stream->get_u2_fast();
6176
6177 guarantee_property(
6178 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6179 cp_size, CHECK);
6180
6181 _orig_cp_size = cp_size;
6182 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6183 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6184 }
6185 cp_size += _max_num_patched_klasses;
6186
6187 _cp = ConstantPool::allocate(_loader_data,
6188 cp_size,
6189 CHECK);
6190
6191 ConstantPool* const cp = _cp;
6192
6193 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6194
6195 assert(cp_size == (const u2)cp->length(), "invariant");
6196
6197 // ACCESS FLAGS
6198 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6199
6200 // Access flags
6201 jint flags;
6202 // JVM_ACC_MODULE is defined in JDK-9 and later.
6203 if (_major_version >= JAVA_9_VERSION) {
6204 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
6205 } else {
6206 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
6207 }
6208
6209 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6210 // Set abstract bit for old class files for backward compatibility
6211 flags |= JVM_ACC_ABSTRACT;
6212 }
6213
6214 verify_legal_class_modifiers(flags, CHECK);
6215
6216 short bad_constant = class_bad_constant_seen();
6217 if (bad_constant != 0) {
6218 // Do not throw CFE until after the access_flags are checked because if
6219 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6220 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6221 }
6222
6223 _access_flags.set_flags(flags);
6224
6225 // This class and superclass
6226 _this_class_index = stream->get_u2_fast();
6227 check_property(
6228 valid_cp_range(_this_class_index, cp_size) &&
6229 cp->tag_at(_this_class_index).is_unresolved_klass(),
6230 "Invalid this class index %u in constant pool in class file %s",
6231 _this_class_index, CHECK);
6232
6233 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6234 assert(class_name_in_cp != NULL, "class_name can't be null");
6235
6236 // Update _class_name to reflect the name in the constant pool
6237 update_class_name(class_name_in_cp);
6238
6239 // Don't need to check whether this class name is legal or not.
6240 // It has been checked when constant pool is parsed.
6241 // However, make sure it is not an array type.
6242 if (_need_verify) {
6243 guarantee_property(_class_name->char_at(0) != JVM_SIGNATURE_ARRAY,
6244 "Bad class name in class file %s",
6245 CHECK);
6246 }
6247
6248 // Checks if name in class file matches requested name
6249 if (_requested_name != NULL && _requested_name != _class_name) {
6250 ResourceMark rm(THREAD);
6251 Exceptions::fthrow(
6252 THREAD_AND_LOCATION,
6253 vmSymbols::java_lang_NoClassDefFoundError(),
6254 "%s (wrong name: %s)",
6255 _class_name->as_C_string(),
6256 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6257 );
6258 return;
6259 }
6260
6261 // if this is an anonymous class fix up its name if it's in the unnamed
6262 // package. Otherwise, throw IAE if it is in a different package than
6263 // its host class.
6264 if (_unsafe_anonymous_host != NULL) {
6265 fix_unsafe_anonymous_class_name(CHECK);
6266 }
6267
6268 // Verification prevents us from creating names with dots in them, this
6269 // asserts that that's the case.
6270 assert(is_internal_format(_class_name), "external class name format used internally");
6271
6272 if (!is_internal()) {
6273 LogTarget(Debug, class, preorder) lt;
6274 if (lt.is_enabled()){
6275 ResourceMark rm(THREAD);
6276 LogStream ls(lt);
6277 ls.print("%s", _class_name->as_klass_external_name());
6278 if (stream->source() != NULL) {
6279 ls.print(" source: %s", stream->source());
6280 }
6281 ls.cr();
6282 }
6283
6284 #if INCLUDE_CDS
6285 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6286 if (!ClassLoader::has_jrt_entry()) {
6287 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6288 DumpLoadedClassList = NULL;
6289 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6290 _unsafe_anonymous_host == NULL) {
6291 // Only dump the classes that can be stored into CDS archive.
6292 // Unsafe anonymous classes such as generated LambdaForm classes are also not included.
6293 oop class_loader = _loader_data->class_loader();
6294 ResourceMark rm(THREAD);
6295 bool skip = false;
6296 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6297 // For the boot and platform class loaders, skip classes that are not found in the
6298 // java runtime image, such as those found in the --patch-module entries.
6299 // These classes can't be loaded from the archive during runtime.
6300 if (!stream->from_boot_loader_modules_image() && strncmp(stream->source(), "jrt:", 4) != 0) {
6301 skip = true;
6302 }
6303
6304 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6305 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6306 // as they can be loaded from the archive during runtime.
6307 skip = false;
6308 }
6309 }
6310 if (skip) {
6311 tty->print_cr("skip writing class %s from source %s to classlist file",
6312 _class_name->as_C_string(), stream->source());
6313 } else {
6314 classlist_file->print_cr("%s", _class_name->as_C_string());
6315 classlist_file->flush();
6316 }
6317 }
6318 }
6319 #endif
6320 }
6321
6322 // SUPERKLASS
6323 _super_class_index = stream->get_u2_fast();
6324 _super_klass = parse_super_class(cp,
6325 _super_class_index,
6326 _need_verify,
6327 CHECK);
6328
6329 // Interfaces
6330 _itfs_len = stream->get_u2_fast();
6331 parse_interfaces(stream,
6332 _itfs_len,
6333 cp,
6334 &_has_nonstatic_concrete_methods,
6335 CHECK);
6336
6337 assert(_local_interfaces != NULL, "invariant");
6338
6339 // Fields (offsets are filled in later)
6340 _fac = new FieldAllocationCount();
6341 parse_fields(stream,
6342 _access_flags.is_interface(),
6343 _fac,
6344 cp,
6345 cp_size,
6346 &_java_fields_count,
6347 CHECK);
6348
6349 assert(_fields != NULL, "invariant");
6350
6351 // Methods
6352 AccessFlags promoted_flags;
6353 parse_methods(stream,
6354 _access_flags.is_interface(),
6355 &promoted_flags,
6356 &_has_final_method,
6357 &_declares_nonstatic_concrete_methods,
6358 CHECK);
6359
6360 assert(_methods != NULL, "invariant");
6361
6362 // promote flags from parse_methods() to the klass' flags
6363 _access_flags.add_promoted_flags(promoted_flags.as_int());
6364
6365 if (_declares_nonstatic_concrete_methods) {
6366 _has_nonstatic_concrete_methods = true;
6367 }
6368
6369 // Additional attributes/annotations
6370 _parsed_annotations = new ClassAnnotationCollector();
6371 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6372
6373 assert(_inner_classes != NULL, "invariant");
6374
6375 // Finalize the Annotations metadata object,
6376 // now that all annotation arrays have been created.
6377 create_combined_annotations(CHECK);
6378
6379 // Make sure this is the end of class file stream
6380 guarantee_property(stream->at_eos(),
6381 "Extra bytes at the end of class file %s",
6382 CHECK);
6383
6384 // all bytes in stream read and parsed
6385 }
6386
6387 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6388 ConstantPool* cp,
6389 TRAPS) {
6390 assert(stream != NULL, "invariant");
6391 assert(stream->at_eos(), "invariant");
6392 assert(cp != NULL, "invariant");
6393 assert(_loader_data != NULL, "invariant");
6394
6395 if (_class_name == vmSymbols::java_lang_Object()) {
6396 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6397 "java.lang.Object cannot implement an interface in class file %s",
6398 CHECK);
6399 }
6400 // We check super class after class file is parsed and format is checked
6401 if (_super_class_index > 0 && NULL ==_super_klass) {
6402 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6403 if (_access_flags.is_interface()) {
6404 // Before attempting to resolve the superclass, check for class format
6405 // errors not checked yet.
6406 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6407 "Interfaces must have java.lang.Object as superclass in class file %s",
6408 CHECK);
6409 }
6410 Handle loader(THREAD, _loader_data->class_loader());
6411 _super_klass = (const InstanceKlass*)
6412 SystemDictionary::resolve_super_or_fail(_class_name,
6413 super_class_name,
6414 loader,
6415 _protection_domain,
6416 true,
6417 CHECK);
6418 }
6419
6420 if (_super_klass != NULL) {
6421 if (_super_klass->has_nonstatic_concrete_methods()) {
6422 _has_nonstatic_concrete_methods = true;
6423 }
6424
6425 if (_super_klass->is_interface()) {
6426 ResourceMark rm(THREAD);
6427 Exceptions::fthrow(
6428 THREAD_AND_LOCATION,
6429 vmSymbols::java_lang_IncompatibleClassChangeError(),
6430 "class %s has interface %s as super class",
6431 _class_name->as_klass_external_name(),
6432 _super_klass->external_name()
6433 );
6434 return;
6435 }
6436 // Make sure super class is not final
6437 if (_super_klass->is_final()) {
6438 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6439 }
6440 }
6441
6442 // Compute the transitive list of all unique interfaces implemented by this class
6443 _transitive_interfaces =
6444 compute_transitive_interfaces(_super_klass,
6445 _local_interfaces,
6446 _loader_data,
6447 CHECK);
6448
6449 assert(_transitive_interfaces != NULL, "invariant");
6450
6451 // sort methods
6452 _method_ordering = sort_methods(_methods);
6453
6454 _all_mirandas = new GrowableArray<Method*>(20);
6455
6456 Handle loader(THREAD, _loader_data->class_loader());
6457 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6458 &_num_miranda_methods,
6459 _all_mirandas,
6460 _super_klass,
6461 _methods,
6462 _access_flags,
6463 _major_version,
6464 loader,
6465 _class_name,
6466 _local_interfaces,
6467 CHECK);
6468
6469 // Size of Java itable (in words)
6470 _itable_size = _access_flags.is_interface() ? 0 :
6471 klassItable::compute_itable_size(_transitive_interfaces);
6472
6473 assert(_fac != NULL, "invariant");
6474 assert(_parsed_annotations != NULL, "invariant");
6475
6476 _field_info = new FieldLayoutInfo();
6477 if (UseNewFieldLayout) {
6478 FieldLayoutBuilder lb(class_name(), super_klass(), _cp, _fields,
6479 _parsed_annotations->is_contended(), _field_info);
6480 lb.build_layout();
6481 } else {
6482 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6483 }
6484
6485 // Compute reference typ
6486 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6487
6488 }
6489
6490 void ClassFileParser::set_klass(InstanceKlass* klass) {
6491
6492 #ifdef ASSERT
6493 if (klass != NULL) {
6494 assert(NULL == _klass, "leaking?");
6495 }
6496 #endif
6497
6498 _klass = klass;
6499 }
6500
6501 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6502
6503 #ifdef ASSERT
6504 if (klass != NULL) {
6505 assert(NULL == _klass_to_deallocate, "leaking?");
6506 }
6507 #endif
6508
6509 _klass_to_deallocate = klass;
6510 }
6511
6512 // Caller responsible for ResourceMark
6513 // clone stream with rewound position
6514 const ClassFileStream* ClassFileParser::clone_stream() const {
6515 assert(_stream != NULL, "invariant");
6516
6517 return _stream->clone();
6518 }
6519 // ----------------------------------------------------------------------------
6520 // debugging
6521
6522 #ifdef ASSERT
6523
6524 // return true if class_name contains no '.' (internal format is '/')
6525 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6526 if (class_name != NULL) {
6527 ResourceMark rm;
6528 char* name = class_name->as_C_string();
6529 return strchr(name, JVM_SIGNATURE_DOT) == NULL;
6530 } else {
6531 return true;
6532 }
6533 }
6534
6535 #endif