1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24 #include "precompiled.hpp"
25 #include "jvm.h"
26 #include "aot/aotLoader.hpp"
27 #include "classfile/classFileParser.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/defaultMethods.hpp"
32 #include "classfile/dictionary.hpp"
33 #include "classfile/javaClasses.inline.hpp"
34 #include "classfile/moduleEntry.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/verificationType.hpp"
39 #include "classfile/verifier.hpp"
40 #include "classfile/vmSymbols.hpp"
41 #include "logging/log.hpp"
42 #include "logging/logStream.hpp"
43 #include "memory/allocation.hpp"
44 #include "memory/metadataFactory.hpp"
45 #include "memory/oopFactory.hpp"
46 #include "memory/resourceArea.hpp"
47 #include "memory/universe.hpp"
48 #include "oops/annotations.hpp"
49 #include "oops/constantPool.inline.hpp"
50 #include "oops/fieldStreams.inline.hpp"
51 #include "oops/instanceKlass.hpp"
52 #include "oops/instanceMirrorKlass.hpp"
53 #include "oops/klass.inline.hpp"
54 #include "oops/klassVtable.hpp"
55 #include "oops/metadata.hpp"
56 #include "oops/method.inline.hpp"
57 #include "oops/oop.inline.hpp"
58 #include "oops/recordComponent.hpp"
59 #include "oops/symbol.hpp"
60 #include "prims/jvmtiExport.hpp"
61 #include "prims/jvmtiThreadState.hpp"
62 #include "runtime/arguments.hpp"
63 #include "runtime/handles.inline.hpp"
64 #include "runtime/javaCalls.hpp"
65 #include "runtime/os.hpp"
66 #include "runtime/perfData.hpp"
67 #include "runtime/reflection.hpp"
68 #include "runtime/safepointVerifiers.hpp"
69 #include "runtime/signature.hpp"
70 #include "runtime/timer.hpp"
71 #include "services/classLoadingService.hpp"
72 #include "services/threadService.hpp"
73 #include "utilities/align.hpp"
74 #include "utilities/bitMap.inline.hpp"
75 #include "utilities/copy.hpp"
76 #include "utilities/exceptions.hpp"
77 #include "utilities/globalDefinitions.hpp"
78 #include "utilities/growableArray.hpp"
79 #include "utilities/macros.hpp"
80 #include "utilities/ostream.hpp"
81 #include "utilities/resourceHash.hpp"
82 #include "utilities/utf8.hpp"
83
84 #if INCLUDE_CDS
85 #include "classfile/systemDictionaryShared.hpp"
86 #endif
87 #if INCLUDE_JFR
88 #include "jfr/support/jfrTraceIdExtension.hpp"
89 #endif
90
91 // We generally try to create the oops directly when parsing, rather than
92 // allocating temporary data structures and copying the bytes twice. A
93 // temporary area is only needed when parsing utf8 entries in the constant
94 // pool and when parsing line number tables.
95
96 // We add assert in debug mode when class format is not checked.
97
98 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
99 #define JAVA_MIN_SUPPORTED_VERSION 45
100 #define JAVA_PREVIEW_MINOR_VERSION 65535
101
102 // Used for two backward compatibility reasons:
103 // - to check for new additions to the class file format in JDK1.5
104 // - to check for bug fixes in the format checker in JDK1.5
105 #define JAVA_1_5_VERSION 49
106
107 // Used for backward compatibility reasons:
108 // - to check for javac bug fixes that happened after 1.5
109 // - also used as the max version when running in jdk6
110 #define JAVA_6_VERSION 50
111
112 // Used for backward compatibility reasons:
113 // - to disallow argument and require ACC_STATIC for <clinit> methods
114 #define JAVA_7_VERSION 51
115
116 // Extension method support.
117 #define JAVA_8_VERSION 52
118
119 #define JAVA_9_VERSION 53
120
121 #define JAVA_10_VERSION 54
122
123 #define JAVA_11_VERSION 55
124
125 #define JAVA_12_VERSION 56
126
127 #define JAVA_13_VERSION 57
128
129 #define JAVA_14_VERSION 58
130
131 #define JAVA_15_VERSION 59
132
133 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
134 assert((bad_constant == JVM_CONSTANT_Module ||
135 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
136 "Unexpected bad constant pool entry");
137 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
138 }
139
140 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
141 ConstantPool* cp,
142 const int length,
143 TRAPS) {
144 assert(stream != NULL, "invariant");
145 assert(cp != NULL, "invariant");
146
147 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
148 // this function (_current can be allocated in a register, with scalar
149 // replacement of aggregates). The _current pointer is copied back to
150 // stream() when this function returns. DON'T call another method within
151 // this method that uses stream().
152 const ClassFileStream cfs1 = *stream;
153 const ClassFileStream* const cfs = &cfs1;
154
155 assert(cfs->allocated_on_stack(), "should be local");
156 debug_only(const u1* const old_current = stream->current();)
157
158 // Used for batching symbol allocations.
159 const char* names[SymbolTable::symbol_alloc_batch_size];
160 int lengths[SymbolTable::symbol_alloc_batch_size];
161 int indices[SymbolTable::symbol_alloc_batch_size];
162 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
163 int names_count = 0;
164
165 // parsing Index 0 is unused
166 for (int index = 1; index < length; index++) {
167 // Each of the following case guarantees one more byte in the stream
168 // for the following tag or the access_flags following constant pool,
169 // so we don't need bounds-check for reading tag.
170 const u1 tag = cfs->get_u1_fast();
171 switch (tag) {
172 case JVM_CONSTANT_Class : {
173 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
174 const u2 name_index = cfs->get_u2_fast();
175 cp->klass_index_at_put(index, name_index);
176 break;
177 }
178 case JVM_CONSTANT_Fieldref: {
179 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
180 const u2 class_index = cfs->get_u2_fast();
181 const u2 name_and_type_index = cfs->get_u2_fast();
182 cp->field_at_put(index, class_index, name_and_type_index);
183 break;
184 }
185 case JVM_CONSTANT_Methodref: {
186 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
187 const u2 class_index = cfs->get_u2_fast();
188 const u2 name_and_type_index = cfs->get_u2_fast();
189 cp->method_at_put(index, class_index, name_and_type_index);
190 break;
191 }
192 case JVM_CONSTANT_InterfaceMethodref: {
193 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
194 const u2 class_index = cfs->get_u2_fast();
195 const u2 name_and_type_index = cfs->get_u2_fast();
196 cp->interface_method_at_put(index, class_index, name_and_type_index);
197 break;
198 }
199 case JVM_CONSTANT_String : {
200 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
201 const u2 string_index = cfs->get_u2_fast();
202 cp->string_index_at_put(index, string_index);
203 break;
204 }
205 case JVM_CONSTANT_MethodHandle :
206 case JVM_CONSTANT_MethodType: {
207 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
208 classfile_parse_error(
209 "Class file version does not support constant tag %u in class file %s",
210 tag, CHECK);
211 }
212 if (tag == JVM_CONSTANT_MethodHandle) {
213 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
214 const u1 ref_kind = cfs->get_u1_fast();
215 const u2 method_index = cfs->get_u2_fast();
216 cp->method_handle_index_at_put(index, ref_kind, method_index);
217 }
218 else if (tag == JVM_CONSTANT_MethodType) {
219 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
220 const u2 signature_index = cfs->get_u2_fast();
221 cp->method_type_index_at_put(index, signature_index);
222 }
223 else {
224 ShouldNotReachHere();
225 }
226 break;
227 }
228 case JVM_CONSTANT_Dynamic : {
229 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
230 classfile_parse_error(
231 "Class file version does not support constant tag %u in class file %s",
232 tag, CHECK);
233 }
234 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
235 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
236 const u2 name_and_type_index = cfs->get_u2_fast();
237 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
238 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
239 }
240 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
241 break;
242 }
243 case JVM_CONSTANT_InvokeDynamic : {
244 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
245 classfile_parse_error(
246 "Class file version does not support constant tag %u in class file %s",
247 tag, CHECK);
248 }
249 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
250 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
251 const u2 name_and_type_index = cfs->get_u2_fast();
252 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
253 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
254 }
255 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
256 break;
257 }
258 case JVM_CONSTANT_Integer: {
259 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
260 const u4 bytes = cfs->get_u4_fast();
261 cp->int_at_put(index, (jint)bytes);
262 break;
263 }
264 case JVM_CONSTANT_Float: {
265 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
266 const u4 bytes = cfs->get_u4_fast();
267 cp->float_at_put(index, *(jfloat*)&bytes);
268 break;
269 }
270 case JVM_CONSTANT_Long: {
271 // A mangled type might cause you to overrun allocated memory
272 guarantee_property(index + 1 < length,
273 "Invalid constant pool entry %u in class file %s",
274 index,
275 CHECK);
276 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
277 const u8 bytes = cfs->get_u8_fast();
278 cp->long_at_put(index, bytes);
279 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
280 break;
281 }
282 case JVM_CONSTANT_Double: {
283 // A mangled type might cause you to overrun allocated memory
284 guarantee_property(index+1 < length,
285 "Invalid constant pool entry %u in class file %s",
286 index,
287 CHECK);
288 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
289 const u8 bytes = cfs->get_u8_fast();
290 cp->double_at_put(index, *(jdouble*)&bytes);
291 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
292 break;
293 }
294 case JVM_CONSTANT_NameAndType: {
295 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
296 const u2 name_index = cfs->get_u2_fast();
297 const u2 signature_index = cfs->get_u2_fast();
298 cp->name_and_type_at_put(index, name_index, signature_index);
299 break;
300 }
301 case JVM_CONSTANT_Utf8 : {
302 cfs->guarantee_more(2, CHECK); // utf8_length
303 u2 utf8_length = cfs->get_u2_fast();
304 const u1* utf8_buffer = cfs->current();
305 assert(utf8_buffer != NULL, "null utf8 buffer");
306 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
307 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
308 cfs->skip_u1_fast(utf8_length);
309
310 // Before storing the symbol, make sure it's legal
311 if (_need_verify) {
312 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
313 }
314
315 if (has_cp_patch_at(index)) {
316 Handle patch = clear_cp_patch_at(index);
317 guarantee_property(java_lang_String::is_instance(patch()),
318 "Illegal utf8 patch at %d in class file %s",
319 index,
320 CHECK);
321 const char* const str = java_lang_String::as_utf8_string(patch());
322 // (could use java_lang_String::as_symbol instead, but might as well batch them)
323 utf8_buffer = (const u1*) str;
324 utf8_length = (u2) strlen(str);
325 }
326
327 unsigned int hash;
328 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
329 utf8_length,
330 hash);
331 if (result == NULL) {
332 names[names_count] = (const char*)utf8_buffer;
333 lengths[names_count] = utf8_length;
334 indices[names_count] = index;
335 hashValues[names_count++] = hash;
336 if (names_count == SymbolTable::symbol_alloc_batch_size) {
337 SymbolTable::new_symbols(_loader_data,
338 constantPoolHandle(THREAD, cp),
339 names_count,
340 names,
341 lengths,
342 indices,
343 hashValues);
344 names_count = 0;
345 }
346 } else {
347 cp->symbol_at_put(index, result);
348 }
349 break;
350 }
351 case JVM_CONSTANT_Module:
352 case JVM_CONSTANT_Package: {
353 // Record that an error occurred in these two cases but keep parsing so
354 // that ACC_Module can be checked for in the access_flags. Need to
355 // throw NoClassDefFoundError in that case.
356 if (_major_version >= JAVA_9_VERSION) {
357 cfs->guarantee_more(3, CHECK);
358 cfs->get_u2_fast();
359 set_class_bad_constant_seen(tag);
360 break;
361 }
362 }
363 default: {
364 classfile_parse_error("Unknown constant tag %u in class file %s",
365 tag,
366 CHECK);
367 break;
368 }
369 } // end of switch(tag)
370 } // end of for
371
372 // Allocate the remaining symbols
373 if (names_count > 0) {
374 SymbolTable::new_symbols(_loader_data,
375 constantPoolHandle(THREAD, cp),
376 names_count,
377 names,
378 lengths,
379 indices,
380 hashValues);
381 }
382
383 // Copy _current pointer of local copy back to stream.
384 assert(stream->current() == old_current, "non-exclusive use of stream");
385 stream->set_current(cfs1.current());
386
387 }
388
389 static inline bool valid_cp_range(int index, int length) {
390 return (index > 0 && index < length);
391 }
392
393 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
394 assert(cp != NULL, "invariant");
395 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
396 return cp->symbol_at(index);
397 }
398 return NULL;
399 }
400
401 #ifdef ASSERT
402 PRAGMA_DIAG_PUSH
403 PRAGMA_FORMAT_NONLITERAL_IGNORED
404 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
405 ResourceMark rm(THREAD);
406 fatal(msg, _class_name->as_C_string());
407 }
408
409 void ClassFileParser::report_assert_property_failure(const char* msg,
410 int index,
411 TRAPS) const {
412 ResourceMark rm(THREAD);
413 fatal(msg, index, _class_name->as_C_string());
414 }
415 PRAGMA_DIAG_POP
416 #endif
417
418 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
419 ConstantPool* const cp,
420 const int length,
421 TRAPS) {
422 assert(cp != NULL, "invariant");
423 assert(stream != NULL, "invariant");
424
425 // parsing constant pool entries
426 parse_constant_pool_entries(stream, cp, length, CHECK);
427 if (class_bad_constant_seen() != 0) {
428 // a bad CP entry has been detected previously so stop parsing and just return.
429 return;
430 }
431
432 int index = 1; // declared outside of loops for portability
433 int num_klasses = 0;
434
435 // first verification pass - validate cross references
436 // and fixup class and string constants
437 for (index = 1; index < length; index++) { // Index 0 is unused
438 const jbyte tag = cp->tag_at(index).value();
439 switch (tag) {
440 case JVM_CONSTANT_Class: {
441 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
442 break;
443 }
444 case JVM_CONSTANT_Fieldref:
445 // fall through
446 case JVM_CONSTANT_Methodref:
447 // fall through
448 case JVM_CONSTANT_InterfaceMethodref: {
449 if (!_need_verify) break;
450 const int klass_ref_index = cp->klass_ref_index_at(index);
451 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
452 check_property(valid_klass_reference_at(klass_ref_index),
453 "Invalid constant pool index %u in class file %s",
454 klass_ref_index, CHECK);
455 check_property(valid_cp_range(name_and_type_ref_index, length) &&
456 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
457 "Invalid constant pool index %u in class file %s",
458 name_and_type_ref_index, CHECK);
459 break;
460 }
461 case JVM_CONSTANT_String: {
462 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
463 break;
464 }
465 case JVM_CONSTANT_Integer:
466 break;
467 case JVM_CONSTANT_Float:
468 break;
469 case JVM_CONSTANT_Long:
470 case JVM_CONSTANT_Double: {
471 index++;
472 check_property(
473 (index < length && cp->tag_at(index).is_invalid()),
474 "Improper constant pool long/double index %u in class file %s",
475 index, CHECK);
476 break;
477 }
478 case JVM_CONSTANT_NameAndType: {
479 if (!_need_verify) break;
480 const int name_ref_index = cp->name_ref_index_at(index);
481 const int signature_ref_index = cp->signature_ref_index_at(index);
482 check_property(valid_symbol_at(name_ref_index),
483 "Invalid constant pool index %u in class file %s",
484 name_ref_index, CHECK);
485 check_property(valid_symbol_at(signature_ref_index),
486 "Invalid constant pool index %u in class file %s",
487 signature_ref_index, CHECK);
488 break;
489 }
490 case JVM_CONSTANT_Utf8:
491 break;
492 case JVM_CONSTANT_UnresolvedClass: // fall-through
493 case JVM_CONSTANT_UnresolvedClassInError: {
494 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
495 break;
496 }
497 case JVM_CONSTANT_ClassIndex: {
498 const int class_index = cp->klass_index_at(index);
499 check_property(valid_symbol_at(class_index),
500 "Invalid constant pool index %u in class file %s",
501 class_index, CHECK);
502 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
503 break;
504 }
505 case JVM_CONSTANT_StringIndex: {
506 const int string_index = cp->string_index_at(index);
507 check_property(valid_symbol_at(string_index),
508 "Invalid constant pool index %u in class file %s",
509 string_index, CHECK);
510 Symbol* const sym = cp->symbol_at(string_index);
511 cp->unresolved_string_at_put(index, sym);
512 break;
513 }
514 case JVM_CONSTANT_MethodHandle: {
515 const int ref_index = cp->method_handle_index_at(index);
516 check_property(valid_cp_range(ref_index, length),
517 "Invalid constant pool index %u in class file %s",
518 ref_index, CHECK);
519 const constantTag tag = cp->tag_at(ref_index);
520 const int ref_kind = cp->method_handle_ref_kind_at(index);
521
522 switch (ref_kind) {
523 case JVM_REF_getField:
524 case JVM_REF_getStatic:
525 case JVM_REF_putField:
526 case JVM_REF_putStatic: {
527 check_property(
528 tag.is_field(),
529 "Invalid constant pool index %u in class file %s (not a field)",
530 ref_index, CHECK);
531 break;
532 }
533 case JVM_REF_invokeVirtual:
534 case JVM_REF_newInvokeSpecial: {
535 check_property(
536 tag.is_method(),
537 "Invalid constant pool index %u in class file %s (not a method)",
538 ref_index, CHECK);
539 break;
540 }
541 case JVM_REF_invokeStatic:
542 case JVM_REF_invokeSpecial: {
543 check_property(
544 tag.is_method() ||
545 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
546 "Invalid constant pool index %u in class file %s (not a method)",
547 ref_index, CHECK);
548 break;
549 }
550 case JVM_REF_invokeInterface: {
551 check_property(
552 tag.is_interface_method(),
553 "Invalid constant pool index %u in class file %s (not an interface method)",
554 ref_index, CHECK);
555 break;
556 }
557 default: {
558 classfile_parse_error(
559 "Bad method handle kind at constant pool index %u in class file %s",
560 index, CHECK);
561 }
562 } // switch(refkind)
563 // Keep the ref_index unchanged. It will be indirected at link-time.
564 break;
565 } // case MethodHandle
566 case JVM_CONSTANT_MethodType: {
567 const int ref_index = cp->method_type_index_at(index);
568 check_property(valid_symbol_at(ref_index),
569 "Invalid constant pool index %u in class file %s",
570 ref_index, CHECK);
571 break;
572 }
573 case JVM_CONSTANT_Dynamic: {
574 const int name_and_type_ref_index =
575 cp->bootstrap_name_and_type_ref_index_at(index);
576
577 check_property(valid_cp_range(name_and_type_ref_index, length) &&
578 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
579 "Invalid constant pool index %u in class file %s",
580 name_and_type_ref_index, CHECK);
581 // bootstrap specifier index must be checked later,
582 // when BootstrapMethods attr is available
583
584 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
585 cp->set_has_dynamic_constant();
586 break;
587 }
588 case JVM_CONSTANT_InvokeDynamic: {
589 const int name_and_type_ref_index =
590 cp->bootstrap_name_and_type_ref_index_at(index);
591
592 check_property(valid_cp_range(name_and_type_ref_index, length) &&
593 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
594 "Invalid constant pool index %u in class file %s",
595 name_and_type_ref_index, CHECK);
596 // bootstrap specifier index must be checked later,
597 // when BootstrapMethods attr is available
598 break;
599 }
600 default: {
601 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
602 ShouldNotReachHere();
603 break;
604 }
605 } // switch(tag)
606 } // end of for
607
608 _first_patched_klass_resolved_index = num_klasses;
609 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
610
611 if (_cp_patches != NULL) {
612 // need to treat this_class specially...
613
614 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
615 // for now. These will be replaced with actual names of the patched classes in patch_class().
616 Symbol* s = vmSymbols::star_name();
617 for (int n=_orig_cp_size; n<cp->length(); n++) {
618 cp->symbol_at_put(n, s);
619 }
620
621 int this_class_index;
622 {
623 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
624 const u1* const mark = stream->current();
625 stream->skip_u2_fast(1); // skip flags
626 this_class_index = stream->get_u2_fast();
627 stream->set_current(mark); // revert to mark
628 }
629
630 for (index = 1; index < length; index++) { // Index 0 is unused
631 if (has_cp_patch_at(index)) {
632 guarantee_property(index != this_class_index,
633 "Illegal constant pool patch to self at %d in class file %s",
634 index, CHECK);
635 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
636 }
637 }
638 }
639
640 if (!_need_verify) {
641 return;
642 }
643
644 // second verification pass - checks the strings are of the right format.
645 // but not yet to the other entries
646 for (index = 1; index < length; index++) {
647 const jbyte tag = cp->tag_at(index).value();
648 switch (tag) {
649 case JVM_CONSTANT_UnresolvedClass: {
650 const Symbol* const class_name = cp->klass_name_at(index);
651 // check the name, even if _cp_patches will overwrite it
652 verify_legal_class_name(class_name, CHECK);
653 break;
654 }
655 case JVM_CONSTANT_NameAndType: {
656 if (_need_verify) {
657 const int sig_index = cp->signature_ref_index_at(index);
658 const int name_index = cp->name_ref_index_at(index);
659 const Symbol* const name = cp->symbol_at(name_index);
660 const Symbol* const sig = cp->symbol_at(sig_index);
661 guarantee_property(sig->utf8_length() != 0,
662 "Illegal zero length constant pool entry at %d in class %s",
663 sig_index, CHECK);
664 guarantee_property(name->utf8_length() != 0,
665 "Illegal zero length constant pool entry at %d in class %s",
666 name_index, CHECK);
667
668 if (sig->char_at(0) == JVM_SIGNATURE_FUNC) {
669 // Format check method name and signature
670 verify_legal_method_name(name, CHECK);
671 verify_legal_method_signature(name, sig, CHECK);
672 } else {
673 // Format check field name and signature
674 verify_legal_field_name(name, CHECK);
675 verify_legal_field_signature(name, sig, CHECK);
676 }
677 }
678 break;
679 }
680 case JVM_CONSTANT_Dynamic: {
681 const int name_and_type_ref_index =
682 cp->name_and_type_ref_index_at(index);
683 // already verified to be utf8
684 const int name_ref_index =
685 cp->name_ref_index_at(name_and_type_ref_index);
686 // already verified to be utf8
687 const int signature_ref_index =
688 cp->signature_ref_index_at(name_and_type_ref_index);
689 const Symbol* const name = cp->symbol_at(name_ref_index);
690 const Symbol* const signature = cp->symbol_at(signature_ref_index);
691 if (_need_verify) {
692 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
693 // Need only to be sure signature is non-zero length and the right type.
694 if (signature->utf8_length() == 0 ||
695 signature->char_at(0) == JVM_SIGNATURE_FUNC) {
696 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
697 }
698 }
699 break;
700 }
701 case JVM_CONSTANT_InvokeDynamic:
702 case JVM_CONSTANT_Fieldref:
703 case JVM_CONSTANT_Methodref:
704 case JVM_CONSTANT_InterfaceMethodref: {
705 const int name_and_type_ref_index =
706 cp->name_and_type_ref_index_at(index);
707 // already verified to be utf8
708 const int name_ref_index =
709 cp->name_ref_index_at(name_and_type_ref_index);
710 // already verified to be utf8
711 const int signature_ref_index =
712 cp->signature_ref_index_at(name_and_type_ref_index);
713 const Symbol* const name = cp->symbol_at(name_ref_index);
714 const Symbol* const signature = cp->symbol_at(signature_ref_index);
715 if (tag == JVM_CONSTANT_Fieldref) {
716 if (_need_verify) {
717 // Field name and signature are verified above, when iterating NameAndType_info.
718 // Need only to be sure signature is non-zero length and the right type.
719 if (signature->utf8_length() == 0 ||
720 signature->char_at(0) == JVM_SIGNATURE_FUNC) {
721 throwIllegalSignature("Field", name, signature, CHECK);
722 }
723 }
724 } else {
725 if (_need_verify) {
726 // Method name and signature are verified above, when iterating NameAndType_info.
727 // Need only to be sure signature is non-zero length and the right type.
728 if (signature->utf8_length() == 0 ||
729 signature->char_at(0) != JVM_SIGNATURE_FUNC) {
730 throwIllegalSignature("Method", name, signature, CHECK);
731 }
732 }
733 // 4509014: If a class method name begins with '<', it must be "<init>"
734 const unsigned int name_len = name->utf8_length();
735 if (tag == JVM_CONSTANT_Methodref &&
736 name_len != 0 &&
737 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
738 name != vmSymbols::object_initializer_name()) {
739 classfile_parse_error(
740 "Bad method name at constant pool index %u in class file %s",
741 name_ref_index, CHECK);
742 }
743 }
744 break;
745 }
746 case JVM_CONSTANT_MethodHandle: {
747 const int ref_index = cp->method_handle_index_at(index);
748 const int ref_kind = cp->method_handle_ref_kind_at(index);
749 switch (ref_kind) {
750 case JVM_REF_invokeVirtual:
751 case JVM_REF_invokeStatic:
752 case JVM_REF_invokeSpecial:
753 case JVM_REF_newInvokeSpecial: {
754 const int name_and_type_ref_index =
755 cp->name_and_type_ref_index_at(ref_index);
756 const int name_ref_index =
757 cp->name_ref_index_at(name_and_type_ref_index);
758 const Symbol* const name = cp->symbol_at(name_ref_index);
759 if (ref_kind == JVM_REF_newInvokeSpecial) {
760 if (name != vmSymbols::object_initializer_name()) {
761 classfile_parse_error(
762 "Bad constructor name at constant pool index %u in class file %s",
763 name_ref_index, CHECK);
764 }
765 } else {
766 if (name == vmSymbols::object_initializer_name()) {
767 classfile_parse_error(
768 "Bad method name at constant pool index %u in class file %s",
769 name_ref_index, CHECK);
770 }
771 }
772 break;
773 }
774 // Other ref_kinds are already fully checked in previous pass.
775 } // switch(ref_kind)
776 break;
777 }
778 case JVM_CONSTANT_MethodType: {
779 const Symbol* const no_name = vmSymbols::type_name(); // place holder
780 const Symbol* const signature = cp->method_type_signature_at(index);
781 verify_legal_method_signature(no_name, signature, CHECK);
782 break;
783 }
784 case JVM_CONSTANT_Utf8: {
785 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
786 }
787 } // switch(tag)
788 } // end of for
789 }
790
791 Handle ClassFileParser::clear_cp_patch_at(int index) {
792 Handle patch = cp_patch_at(index);
793 _cp_patches->at_put(index, Handle());
794 assert(!has_cp_patch_at(index), "");
795 return patch;
796 }
797
798 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
799 int name_index = _orig_cp_size + _num_patched_klasses;
800 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
801
802 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
803 _num_patched_klasses ++;
804 }
805
806 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
807 int index,
808 Handle patch,
809 TRAPS) {
810 assert(cp != NULL, "invariant");
811
812 BasicType patch_type = T_VOID;
813
814 switch (cp->tag_at(index).value()) {
815
816 case JVM_CONSTANT_UnresolvedClass: {
817 // Patching a class means pre-resolving it.
818 // The name in the constant pool is ignored.
819 if (java_lang_Class::is_instance(patch())) {
820 guarantee_property(!java_lang_Class::is_primitive(patch()),
821 "Illegal class patch at %d in class file %s",
822 index, CHECK);
823 Klass* k = java_lang_Class::as_Klass(patch());
824 patch_class(cp, index, k, k->name());
825 } else {
826 guarantee_property(java_lang_String::is_instance(patch()),
827 "Illegal class patch at %d in class file %s",
828 index, CHECK);
829 Symbol* const name = java_lang_String::as_symbol(patch());
830 patch_class(cp, index, NULL, name);
831 }
832 break;
833 }
834
835 case JVM_CONSTANT_String: {
836 // skip this patch and don't clear it. Needs the oop array for resolved
837 // references to be created first.
838 return;
839 }
840 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
841 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
842 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
843 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
844 patch_prim:
845 {
846 jvalue value;
847 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
848 guarantee_property(value_type == patch_type,
849 "Illegal primitive patch at %d in class file %s",
850 index, CHECK);
851 switch (value_type) {
852 case T_INT: cp->int_at_put(index, value.i); break;
853 case T_FLOAT: cp->float_at_put(index, value.f); break;
854 case T_LONG: cp->long_at_put(index, value.j); break;
855 case T_DOUBLE: cp->double_at_put(index, value.d); break;
856 default: assert(false, "");
857 }
858 } // end patch_prim label
859 break;
860
861 default: {
862 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
863 guarantee_property(!has_cp_patch_at(index),
864 "Illegal unexpected patch at %d in class file %s",
865 index, CHECK);
866 return;
867 }
868 } // end of switch(tag)
869
870 // On fall-through, mark the patch as used.
871 clear_cp_patch_at(index);
872 }
873 class NameSigHash: public ResourceObj {
874 public:
875 const Symbol* _name; // name
876 const Symbol* _sig; // signature
877 NameSigHash* _next; // Next entry in hash table
878 };
879
880 static const int HASH_ROW_SIZE = 256;
881
882 static unsigned int hash(const Symbol* name, const Symbol* sig) {
883 unsigned int raw_hash = 0;
884 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
885 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
886
887 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
888 }
889
890
891 static void initialize_hashtable(NameSigHash** table) {
892 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
893 }
894 // Return false if the name/sig combination is found in table.
895 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
896 // The old format checker uses heap sort to find duplicates.
897 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
898 // of table since we don't expect Symbol*'s to move.
899 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
900 assert(name != NULL, "name in constant pool is NULL");
901
902 // First lookup for duplicates
903 int index = hash(name, sig);
904 NameSigHash* entry = table[index];
905 while (entry != NULL) {
906 if (entry->_name == name && entry->_sig == sig) {
907 return false;
908 }
909 entry = entry->_next;
910 }
911
912 // No duplicate is found, allocate a new entry and fill it.
913 entry = new NameSigHash();
914 entry->_name = name;
915 entry->_sig = sig;
916
917 // Insert into hash table
918 entry->_next = table[index];
919 table[index] = entry;
920
921 return true;
922 }
923
924 // Side-effects: populates the _local_interfaces field
925 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
926 const int itfs_len,
927 ConstantPool* const cp,
928 bool* const has_nonstatic_concrete_methods,
929 TRAPS) {
930 assert(stream != NULL, "invariant");
931 assert(cp != NULL, "invariant");
932 assert(has_nonstatic_concrete_methods != NULL, "invariant");
933
934 if (itfs_len == 0) {
935 _local_interfaces = Universe::the_empty_instance_klass_array();
936 } else {
937 assert(itfs_len > 0, "only called for len>0");
938 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
939
940 int index;
941 for (index = 0; index < itfs_len; index++) {
942 const u2 interface_index = stream->get_u2(CHECK);
943 Klass* interf;
944 check_property(
945 valid_klass_reference_at(interface_index),
946 "Interface name has bad constant pool index %u in class file %s",
947 interface_index, CHECK);
948 if (cp->tag_at(interface_index).is_klass()) {
949 interf = cp->resolved_klass_at(interface_index);
950 } else {
951 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
952
953 // Don't need to check legal name because it's checked when parsing constant pool.
954 // But need to make sure it's not an array type.
955 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
956 "Bad interface name in class file %s", CHECK);
957
958 // Call resolve_super so classcircularity is checked
959 interf = SystemDictionary::resolve_super_or_fail(
960 _class_name,
961 unresolved_klass,
962 Handle(THREAD, _loader_data->class_loader()),
963 _protection_domain,
964 false,
965 CHECK);
966 }
967
968 if (!interf->is_interface()) {
969 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
970 err_msg("class %s can not implement %s, because it is not an interface (%s)",
971 _class_name->as_klass_external_name(),
972 interf->external_name(),
973 interf->class_in_module_of_loader()));
974 }
975
976 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
977 *has_nonstatic_concrete_methods = true;
978 }
979 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
980 }
981
982 if (!_need_verify || itfs_len <= 1) {
983 return;
984 }
985
986 // Check if there's any duplicates in interfaces
987 ResourceMark rm(THREAD);
988 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
989 NameSigHash*,
990 HASH_ROW_SIZE);
991 initialize_hashtable(interface_names);
992 bool dup = false;
993 const Symbol* name = NULL;
994 {
995 debug_only(NoSafepointVerifier nsv;)
996 for (index = 0; index < itfs_len; index++) {
997 const InstanceKlass* const k = _local_interfaces->at(index);
998 name = k->name();
999 // If no duplicates, add (name, NULL) in hashtable interface_names.
1000 if (!put_after_lookup(name, NULL, interface_names)) {
1001 dup = true;
1002 break;
1003 }
1004 }
1005 }
1006 if (dup) {
1007 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
1008 name->as_C_string(), CHECK);
1009 }
1010 }
1011 }
1012
1013 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
1014 int constantvalue_index,
1015 int signature_index,
1016 TRAPS) const {
1017 // Make sure the constant pool entry is of a type appropriate to this field
1018 guarantee_property(
1019 (constantvalue_index > 0 &&
1020 constantvalue_index < cp->length()),
1021 "Bad initial value index %u in ConstantValue attribute in class file %s",
1022 constantvalue_index, CHECK);
1023
1024 const constantTag value_type = cp->tag_at(constantvalue_index);
1025 switch(cp->basic_type_for_signature_at(signature_index)) {
1026 case T_LONG: {
1027 guarantee_property(value_type.is_long(),
1028 "Inconsistent constant value type in class file %s",
1029 CHECK);
1030 break;
1031 }
1032 case T_FLOAT: {
1033 guarantee_property(value_type.is_float(),
1034 "Inconsistent constant value type in class file %s",
1035 CHECK);
1036 break;
1037 }
1038 case T_DOUBLE: {
1039 guarantee_property(value_type.is_double(),
1040 "Inconsistent constant value type in class file %s",
1041 CHECK);
1042 break;
1043 }
1044 case T_BYTE:
1045 case T_CHAR:
1046 case T_SHORT:
1047 case T_BOOLEAN:
1048 case T_INT: {
1049 guarantee_property(value_type.is_int(),
1050 "Inconsistent constant value type in class file %s",
1051 CHECK);
1052 break;
1053 }
1054 case T_OBJECT: {
1055 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1056 && value_type.is_string()),
1057 "Bad string initial value in class file %s",
1058 CHECK);
1059 break;
1060 }
1061 default: {
1062 classfile_parse_error("Unable to set initial value %u in class file %s",
1063 constantvalue_index,
1064 CHECK);
1065 }
1066 }
1067 }
1068
1069 class AnnotationCollector : public ResourceObj{
1070 public:
1071 enum Location { _in_field, _in_method, _in_class };
1072 enum ID {
1073 _unknown = 0,
1074 _method_CallerSensitive,
1075 _method_ForceInline,
1076 _method_DontInline,
1077 _method_InjectedProfile,
1078 _method_LambdaForm_Compiled,
1079 _method_Hidden,
1080 _method_HotSpotIntrinsicCandidate,
1081 _jdk_internal_vm_annotation_Contended,
1082 _field_Stable,
1083 _jdk_internal_vm_annotation_ReservedStackAccess,
1084 _annotation_LIMIT
1085 };
1086 const Location _location;
1087 int _annotations_present;
1088 u2 _contended_group;
1089
1090 AnnotationCollector(Location location)
1091 : _location(location), _annotations_present(0)
1092 {
1093 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1094 }
1095 // If this annotation name has an ID, report it (or _none).
1096 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1097 // Set the annotation name:
1098 void set_annotation(ID id) {
1099 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1100 _annotations_present |= nth_bit((int)id);
1101 }
1102
1103 void remove_annotation(ID id) {
1104 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1105 _annotations_present &= ~nth_bit((int)id);
1106 }
1107
1108 // Report if the annotation is present.
1109 bool has_any_annotations() const { return _annotations_present != 0; }
1110 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1111
1112 void set_contended_group(u2 group) { _contended_group = group; }
1113 u2 contended_group() const { return _contended_group; }
1114
1115 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1116
1117 void set_stable(bool stable) { set_annotation(_field_Stable); }
1118 bool is_stable() const { return has_annotation(_field_Stable); }
1119 };
1120
1121 // This class also doubles as a holder for metadata cleanup.
1122 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1123 private:
1124 ClassLoaderData* _loader_data;
1125 AnnotationArray* _field_annotations;
1126 AnnotationArray* _field_type_annotations;
1127 public:
1128 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1129 AnnotationCollector(_in_field),
1130 _loader_data(loader_data),
1131 _field_annotations(NULL),
1132 _field_type_annotations(NULL) {}
1133 ~FieldAnnotationCollector();
1134 void apply_to(FieldInfo* f);
1135 AnnotationArray* field_annotations() { return _field_annotations; }
1136 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1137
1138 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1139 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1140 };
1141
1142 class MethodAnnotationCollector : public AnnotationCollector{
1143 public:
1144 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1145 void apply_to(const methodHandle& m);
1146 };
1147
1148 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1149 public:
1150 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1151 void apply_to(InstanceKlass* ik);
1152 };
1153
1154
1155 static int skip_annotation_value(const u1*, int, int); // fwd decl
1156
1157 // Safely increment index by val if does not pass limit
1158 #define SAFE_ADD(index, limit, val) \
1159 if (index >= limit - val) return limit; \
1160 index += val;
1161
1162 // Skip an annotation. Return >=limit if there is any problem.
1163 static int skip_annotation(const u1* buffer, int limit, int index) {
1164 assert(buffer != NULL, "invariant");
1165 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1166 // value := switch (tag:u1) { ... }
1167 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1168 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1169 while (--nmem >= 0 && index < limit) {
1170 SAFE_ADD(index, limit, 2); // skip member
1171 index = skip_annotation_value(buffer, limit, index);
1172 }
1173 return index;
1174 }
1175
1176 // Skip an annotation value. Return >=limit if there is any problem.
1177 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1178 assert(buffer != NULL, "invariant");
1179
1180 // value := switch (tag:u1) {
1181 // case B, C, I, S, Z, D, F, J, c: con:u2;
1182 // case e: e_class:u2 e_name:u2;
1183 // case s: s_con:u2;
1184 // case [: do(nval:u2) {value};
1185 // case @: annotation;
1186 // case s: s_con:u2;
1187 // }
1188 SAFE_ADD(index, limit, 1); // read tag
1189 const u1 tag = buffer[index - 1];
1190 switch (tag) {
1191 case 'B':
1192 case 'C':
1193 case 'I':
1194 case 'S':
1195 case 'Z':
1196 case 'D':
1197 case 'F':
1198 case 'J':
1199 case 'c':
1200 case 's':
1201 SAFE_ADD(index, limit, 2); // skip con or s_con
1202 break;
1203 case 'e':
1204 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1205 break;
1206 case '[':
1207 {
1208 SAFE_ADD(index, limit, 2); // read nval
1209 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1210 while (--nval >= 0 && index < limit) {
1211 index = skip_annotation_value(buffer, limit, index);
1212 }
1213 }
1214 break;
1215 case '@':
1216 index = skip_annotation(buffer, limit, index);
1217 break;
1218 default:
1219 return limit; // bad tag byte
1220 }
1221 return index;
1222 }
1223
1224 // Sift through annotations, looking for those significant to the VM:
1225 static void parse_annotations(const ConstantPool* const cp,
1226 const u1* buffer, int limit,
1227 AnnotationCollector* coll,
1228 ClassLoaderData* loader_data,
1229 TRAPS) {
1230
1231 assert(cp != NULL, "invariant");
1232 assert(buffer != NULL, "invariant");
1233 assert(coll != NULL, "invariant");
1234 assert(loader_data != NULL, "invariant");
1235
1236 // annotations := do(nann:u2) {annotation}
1237 int index = 2; // read nann
1238 if (index >= limit) return;
1239 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1240 enum { // initial annotation layout
1241 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1242 count_off = 2, // u2 such as 1 (one value)
1243 member_off = 4, // utf8 such as 'value'
1244 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1245 e_tag_val = 'e',
1246 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1247 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1248 e_size = 11, // end of 'e' annotation
1249 c_tag_val = 'c', // payload is type
1250 c_con_off = 7, // utf8 payload, such as 'I'
1251 c_size = 9, // end of 'c' annotation
1252 s_tag_val = 's', // payload is String
1253 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1254 s_size = 9,
1255 min_size = 6 // smallest possible size (zero members)
1256 };
1257 // Cannot add min_size to index in case of overflow MAX_INT
1258 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1259 int index0 = index;
1260 index = skip_annotation(buffer, limit, index);
1261 const u1* const abase = buffer + index0;
1262 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1263 const int count = Bytes::get_Java_u2((address)abase + count_off);
1264 const Symbol* const aname = check_symbol_at(cp, atype);
1265 if (aname == NULL) break; // invalid annotation name
1266 const Symbol* member = NULL;
1267 if (count >= 1) {
1268 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1269 member = check_symbol_at(cp, member_index);
1270 if (member == NULL) break; // invalid member name
1271 }
1272
1273 // Here is where parsing particular annotations will take place.
1274 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1275 if (AnnotationCollector::_unknown == id) continue;
1276 coll->set_annotation(id);
1277
1278 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1279 // @Contended can optionally specify the contention group.
1280 //
1281 // Contended group defines the equivalence class over the fields:
1282 // the fields within the same contended group are not treated distinct.
1283 // The only exception is default group, which does not incur the
1284 // equivalence. Naturally, contention group for classes is meaningless.
1285 //
1286 // While the contention group is specified as String, annotation
1287 // values are already interned, and we might as well use the constant
1288 // pool index as the group tag.
1289 //
1290 u2 group_index = 0; // default contended group
1291 if (count == 1
1292 && s_size == (index - index0) // match size
1293 && s_tag_val == *(abase + tag_off)
1294 && member == vmSymbols::value_name()) {
1295 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1296 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1297 group_index = 0; // default contended group
1298 }
1299 }
1300 coll->set_contended_group(group_index);
1301 }
1302 }
1303 }
1304
1305
1306 // Parse attributes for a field.
1307 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1308 u2 attributes_count,
1309 bool is_static, u2 signature_index,
1310 u2* const constantvalue_index_addr,
1311 bool* const is_synthetic_addr,
1312 u2* const generic_signature_index_addr,
1313 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1314 TRAPS) {
1315 assert(cfs != NULL, "invariant");
1316 assert(constantvalue_index_addr != NULL, "invariant");
1317 assert(is_synthetic_addr != NULL, "invariant");
1318 assert(generic_signature_index_addr != NULL, "invariant");
1319 assert(parsed_annotations != NULL, "invariant");
1320 assert(attributes_count > 0, "attributes_count should be greater than 0");
1321
1322 u2 constantvalue_index = 0;
1323 u2 generic_signature_index = 0;
1324 bool is_synthetic = false;
1325 const u1* runtime_visible_annotations = NULL;
1326 int runtime_visible_annotations_length = 0;
1327 const u1* runtime_invisible_annotations = NULL;
1328 int runtime_invisible_annotations_length = 0;
1329 const u1* runtime_visible_type_annotations = NULL;
1330 int runtime_visible_type_annotations_length = 0;
1331 const u1* runtime_invisible_type_annotations = NULL;
1332 int runtime_invisible_type_annotations_length = 0;
1333 bool runtime_invisible_annotations_exists = false;
1334 bool runtime_invisible_type_annotations_exists = false;
1335 const ConstantPool* const cp = _cp;
1336
1337 while (attributes_count--) {
1338 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1339 const u2 attribute_name_index = cfs->get_u2_fast();
1340 const u4 attribute_length = cfs->get_u4_fast();
1341 check_property(valid_symbol_at(attribute_name_index),
1342 "Invalid field attribute index %u in class file %s",
1343 attribute_name_index,
1344 CHECK);
1345
1346 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1347 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1348 // ignore if non-static
1349 if (constantvalue_index != 0) {
1350 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1351 }
1352 check_property(
1353 attribute_length == 2,
1354 "Invalid ConstantValue field attribute length %u in class file %s",
1355 attribute_length, CHECK);
1356
1357 constantvalue_index = cfs->get_u2(CHECK);
1358 if (_need_verify) {
1359 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1360 }
1361 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1362 if (attribute_length != 0) {
1363 classfile_parse_error(
1364 "Invalid Synthetic field attribute length %u in class file %s",
1365 attribute_length, CHECK);
1366 }
1367 is_synthetic = true;
1368 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1369 if (attribute_length != 0) {
1370 classfile_parse_error(
1371 "Invalid Deprecated field attribute length %u in class file %s",
1372 attribute_length, CHECK);
1373 }
1374 } else if (_major_version >= JAVA_1_5_VERSION) {
1375 if (attribute_name == vmSymbols::tag_signature()) {
1376 if (generic_signature_index != 0) {
1377 classfile_parse_error(
1378 "Multiple Signature attributes for field in class file %s", CHECK);
1379 }
1380 if (attribute_length != 2) {
1381 classfile_parse_error(
1382 "Wrong size %u for field's Signature attribute in class file %s",
1383 attribute_length, CHECK);
1384 }
1385 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1386 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1387 if (runtime_visible_annotations != NULL) {
1388 classfile_parse_error(
1389 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1390 }
1391 runtime_visible_annotations_length = attribute_length;
1392 runtime_visible_annotations = cfs->current();
1393 assert(runtime_visible_annotations != NULL, "null visible annotations");
1394 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1395 parse_annotations(cp,
1396 runtime_visible_annotations,
1397 runtime_visible_annotations_length,
1398 parsed_annotations,
1399 _loader_data,
1400 CHECK);
1401 cfs->skip_u1_fast(runtime_visible_annotations_length);
1402 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1403 if (runtime_invisible_annotations_exists) {
1404 classfile_parse_error(
1405 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1406 }
1407 runtime_invisible_annotations_exists = true;
1408 if (PreserveAllAnnotations) {
1409 runtime_invisible_annotations_length = attribute_length;
1410 runtime_invisible_annotations = cfs->current();
1411 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1412 }
1413 cfs->skip_u1(attribute_length, CHECK);
1414 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1415 if (runtime_visible_type_annotations != NULL) {
1416 classfile_parse_error(
1417 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1418 }
1419 runtime_visible_type_annotations_length = attribute_length;
1420 runtime_visible_type_annotations = cfs->current();
1421 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1422 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1423 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1424 if (runtime_invisible_type_annotations_exists) {
1425 classfile_parse_error(
1426 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1427 } else {
1428 runtime_invisible_type_annotations_exists = true;
1429 }
1430 if (PreserveAllAnnotations) {
1431 runtime_invisible_type_annotations_length = attribute_length;
1432 runtime_invisible_type_annotations = cfs->current();
1433 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1434 }
1435 cfs->skip_u1(attribute_length, CHECK);
1436 } else {
1437 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1438 }
1439 } else {
1440 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1441 }
1442 }
1443
1444 *constantvalue_index_addr = constantvalue_index;
1445 *is_synthetic_addr = is_synthetic;
1446 *generic_signature_index_addr = generic_signature_index;
1447 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1448 runtime_visible_annotations_length,
1449 runtime_invisible_annotations,
1450 runtime_invisible_annotations_length,
1451 CHECK);
1452 parsed_annotations->set_field_annotations(a);
1453 a = assemble_annotations(runtime_visible_type_annotations,
1454 runtime_visible_type_annotations_length,
1455 runtime_invisible_type_annotations,
1456 runtime_invisible_type_annotations_length,
1457 CHECK);
1458 parsed_annotations->set_field_type_annotations(a);
1459 return;
1460 }
1461
1462
1463 // Field allocation types. Used for computing field offsets.
1464
1465 enum FieldAllocationType {
1466 STATIC_OOP, // Oops
1467 STATIC_BYTE, // Boolean, Byte, char
1468 STATIC_SHORT, // shorts
1469 STATIC_WORD, // ints
1470 STATIC_DOUBLE, // aligned long or double
1471 NONSTATIC_OOP,
1472 NONSTATIC_BYTE,
1473 NONSTATIC_SHORT,
1474 NONSTATIC_WORD,
1475 NONSTATIC_DOUBLE,
1476 MAX_FIELD_ALLOCATION_TYPE,
1477 BAD_ALLOCATION_TYPE = -1
1478 };
1479
1480 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1481 BAD_ALLOCATION_TYPE, // 0
1482 BAD_ALLOCATION_TYPE, // 1
1483 BAD_ALLOCATION_TYPE, // 2
1484 BAD_ALLOCATION_TYPE, // 3
1485 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1486 NONSTATIC_SHORT, // T_CHAR = 5,
1487 NONSTATIC_WORD, // T_FLOAT = 6,
1488 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1489 NONSTATIC_BYTE, // T_BYTE = 8,
1490 NONSTATIC_SHORT, // T_SHORT = 9,
1491 NONSTATIC_WORD, // T_INT = 10,
1492 NONSTATIC_DOUBLE, // T_LONG = 11,
1493 NONSTATIC_OOP, // T_OBJECT = 12,
1494 NONSTATIC_OOP, // T_ARRAY = 13,
1495 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1496 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1497 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1498 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1499 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1500 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1501 BAD_ALLOCATION_TYPE, // 0
1502 BAD_ALLOCATION_TYPE, // 1
1503 BAD_ALLOCATION_TYPE, // 2
1504 BAD_ALLOCATION_TYPE, // 3
1505 STATIC_BYTE , // T_BOOLEAN = 4,
1506 STATIC_SHORT, // T_CHAR = 5,
1507 STATIC_WORD, // T_FLOAT = 6,
1508 STATIC_DOUBLE, // T_DOUBLE = 7,
1509 STATIC_BYTE, // T_BYTE = 8,
1510 STATIC_SHORT, // T_SHORT = 9,
1511 STATIC_WORD, // T_INT = 10,
1512 STATIC_DOUBLE, // T_LONG = 11,
1513 STATIC_OOP, // T_OBJECT = 12,
1514 STATIC_OOP, // T_ARRAY = 13,
1515 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1516 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1517 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1518 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1519 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1520 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1521 };
1522
1523 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1524 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1525 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1526 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1527 return result;
1528 }
1529
1530 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1531 public:
1532 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1533
1534 FieldAllocationCount() {
1535 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1536 count[i] = 0;
1537 }
1538 }
1539
1540 FieldAllocationType update(bool is_static, BasicType type) {
1541 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1542 if (atype != BAD_ALLOCATION_TYPE) {
1543 // Make sure there is no overflow with injected fields.
1544 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1545 count[atype]++;
1546 }
1547 return atype;
1548 }
1549 };
1550
1551 // Side-effects: populates the _fields, _fields_annotations,
1552 // _fields_type_annotations fields
1553 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1554 bool is_interface,
1555 FieldAllocationCount* const fac,
1556 ConstantPool* cp,
1557 const int cp_size,
1558 u2* const java_fields_count_ptr,
1559 TRAPS) {
1560
1561 assert(cfs != NULL, "invariant");
1562 assert(fac != NULL, "invariant");
1563 assert(cp != NULL, "invariant");
1564 assert(java_fields_count_ptr != NULL, "invariant");
1565
1566 assert(NULL == _fields, "invariant");
1567 assert(NULL == _fields_annotations, "invariant");
1568 assert(NULL == _fields_type_annotations, "invariant");
1569
1570 cfs->guarantee_more(2, CHECK); // length
1571 const u2 length = cfs->get_u2_fast();
1572 *java_fields_count_ptr = length;
1573
1574 int num_injected = 0;
1575 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1576 &num_injected);
1577 const int total_fields = length + num_injected;
1578
1579 // The field array starts with tuples of shorts
1580 // [access, name index, sig index, initial value index, byte offset].
1581 // A generic signature slot only exists for field with generic
1582 // signature attribute. And the access flag is set with
1583 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1584 // signature slots are at the end of the field array and after all
1585 // other fields data.
1586 //
1587 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1588 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1589 // ...
1590 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1591 // [generic signature index]
1592 // [generic signature index]
1593 // ...
1594 //
1595 // Allocate a temporary resource array for field data. For each field,
1596 // a slot is reserved in the temporary array for the generic signature
1597 // index. After parsing all fields, the data are copied to a permanent
1598 // array and any unused slots will be discarded.
1599 ResourceMark rm(THREAD);
1600 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1601 u2,
1602 total_fields * (FieldInfo::field_slots + 1));
1603
1604 // The generic signature slots start after all other fields' data.
1605 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1606 int num_generic_signature = 0;
1607 for (int n = 0; n < length; n++) {
1608 // access_flags, name_index, descriptor_index, attributes_count
1609 cfs->guarantee_more(8, CHECK);
1610
1611 AccessFlags access_flags;
1612 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1613 verify_legal_field_modifiers(flags, is_interface, CHECK);
1614 access_flags.set_flags(flags);
1615
1616 const u2 name_index = cfs->get_u2_fast();
1617 check_property(valid_symbol_at(name_index),
1618 "Invalid constant pool index %u for field name in class file %s",
1619 name_index, CHECK);
1620 const Symbol* const name = cp->symbol_at(name_index);
1621 verify_legal_field_name(name, CHECK);
1622
1623 const u2 signature_index = cfs->get_u2_fast();
1624 check_property(valid_symbol_at(signature_index),
1625 "Invalid constant pool index %u for field signature in class file %s",
1626 signature_index, CHECK);
1627 const Symbol* const sig = cp->symbol_at(signature_index);
1628 verify_legal_field_signature(name, sig, CHECK);
1629
1630 u2 constantvalue_index = 0;
1631 bool is_synthetic = false;
1632 u2 generic_signature_index = 0;
1633 const bool is_static = access_flags.is_static();
1634 FieldAnnotationCollector parsed_annotations(_loader_data);
1635
1636 const u2 attributes_count = cfs->get_u2_fast();
1637 if (attributes_count > 0) {
1638 parse_field_attributes(cfs,
1639 attributes_count,
1640 is_static,
1641 signature_index,
1642 &constantvalue_index,
1643 &is_synthetic,
1644 &generic_signature_index,
1645 &parsed_annotations,
1646 CHECK);
1647
1648 if (parsed_annotations.field_annotations() != NULL) {
1649 if (_fields_annotations == NULL) {
1650 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1651 _loader_data, length, NULL,
1652 CHECK);
1653 }
1654 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1655 parsed_annotations.set_field_annotations(NULL);
1656 }
1657 if (parsed_annotations.field_type_annotations() != NULL) {
1658 if (_fields_type_annotations == NULL) {
1659 _fields_type_annotations =
1660 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1661 length,
1662 NULL,
1663 CHECK);
1664 }
1665 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1666 parsed_annotations.set_field_type_annotations(NULL);
1667 }
1668
1669 if (is_synthetic) {
1670 access_flags.set_is_synthetic();
1671 }
1672 if (generic_signature_index != 0) {
1673 access_flags.set_field_has_generic_signature();
1674 fa[generic_signature_slot] = generic_signature_index;
1675 generic_signature_slot ++;
1676 num_generic_signature ++;
1677 }
1678 }
1679
1680 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1681 field->initialize(access_flags.as_short(),
1682 name_index,
1683 signature_index,
1684 constantvalue_index);
1685 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1686
1687 // Remember how many oops we encountered and compute allocation type
1688 const FieldAllocationType atype = fac->update(is_static, type);
1689 field->set_allocation_type(atype);
1690
1691 // After field is initialized with type, we can augment it with aux info
1692 if (parsed_annotations.has_any_annotations())
1693 parsed_annotations.apply_to(field);
1694 }
1695
1696 int index = length;
1697 if (num_injected != 0) {
1698 for (int n = 0; n < num_injected; n++) {
1699 // Check for duplicates
1700 if (injected[n].may_be_java) {
1701 const Symbol* const name = injected[n].name();
1702 const Symbol* const signature = injected[n].signature();
1703 bool duplicate = false;
1704 for (int i = 0; i < length; i++) {
1705 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1706 if (name == cp->symbol_at(f->name_index()) &&
1707 signature == cp->symbol_at(f->signature_index())) {
1708 // Symbol is desclared in Java so skip this one
1709 duplicate = true;
1710 break;
1711 }
1712 }
1713 if (duplicate) {
1714 // These will be removed from the field array at the end
1715 continue;
1716 }
1717 }
1718
1719 // Injected field
1720 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1721 field->initialize(JVM_ACC_FIELD_INTERNAL,
1722 injected[n].name_index,
1723 injected[n].signature_index,
1724 0);
1725
1726 const BasicType type = FieldType::basic_type(injected[n].signature());
1727
1728 // Remember how many oops we encountered and compute allocation type
1729 const FieldAllocationType atype = fac->update(false, type);
1730 field->set_allocation_type(atype);
1731 index++;
1732 }
1733 }
1734
1735 assert(NULL == _fields, "invariant");
1736
1737 _fields =
1738 MetadataFactory::new_array<u2>(_loader_data,
1739 index * FieldInfo::field_slots + num_generic_signature,
1740 CHECK);
1741 // Sometimes injected fields already exist in the Java source so
1742 // the fields array could be too long. In that case the
1743 // fields array is trimed. Also unused slots that were reserved
1744 // for generic signature indexes are discarded.
1745 {
1746 int i = 0;
1747 for (; i < index * FieldInfo::field_slots; i++) {
1748 _fields->at_put(i, fa[i]);
1749 }
1750 for (int j = total_fields * FieldInfo::field_slots;
1751 j < generic_signature_slot; j++) {
1752 _fields->at_put(i++, fa[j]);
1753 }
1754 assert(_fields->length() == i, "");
1755 }
1756
1757 if (_need_verify && length > 1) {
1758 // Check duplicated fields
1759 ResourceMark rm(THREAD);
1760 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1761 THREAD, NameSigHash*, HASH_ROW_SIZE);
1762 initialize_hashtable(names_and_sigs);
1763 bool dup = false;
1764 const Symbol* name = NULL;
1765 const Symbol* sig = NULL;
1766 {
1767 debug_only(NoSafepointVerifier nsv;)
1768 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1769 name = fs.name();
1770 sig = fs.signature();
1771 // If no duplicates, add name/signature in hashtable names_and_sigs.
1772 if (!put_after_lookup(name, sig, names_and_sigs)) {
1773 dup = true;
1774 break;
1775 }
1776 }
1777 }
1778 if (dup) {
1779 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1780 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1781 }
1782 }
1783 }
1784
1785
1786 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1787 u4 code_length,
1788 u4 exception_table_length,
1789 TRAPS) {
1790 assert(cfs != NULL, "invariant");
1791
1792 const unsafe_u2* const exception_table_start = cfs->current();
1793 assert(exception_table_start != NULL, "null exception table");
1794
1795 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1796 // end_pc,
1797 // handler_pc,
1798 // catch_type_index
1799
1800 // Will check legal target after parsing code array in verifier.
1801 if (_need_verify) {
1802 for (unsigned int i = 0; i < exception_table_length; i++) {
1803 const u2 start_pc = cfs->get_u2_fast();
1804 const u2 end_pc = cfs->get_u2_fast();
1805 const u2 handler_pc = cfs->get_u2_fast();
1806 const u2 catch_type_index = cfs->get_u2_fast();
1807 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1808 "Illegal exception table range in class file %s",
1809 CHECK_NULL);
1810 guarantee_property(handler_pc < code_length,
1811 "Illegal exception table handler in class file %s",
1812 CHECK_NULL);
1813 if (catch_type_index != 0) {
1814 guarantee_property(valid_klass_reference_at(catch_type_index),
1815 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1816 }
1817 }
1818 } else {
1819 cfs->skip_u2_fast(exception_table_length * 4);
1820 }
1821 return exception_table_start;
1822 }
1823
1824 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1825 u4 code_length,
1826 CompressedLineNumberWriteStream**const write_stream,
1827 TRAPS) {
1828
1829 const ClassFileStream* const cfs = _stream;
1830 unsigned int num_entries = cfs->get_u2(CHECK);
1831
1832 // Each entry is a u2 start_pc, and a u2 line_number
1833 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1834
1835 // Verify line number attribute and table length
1836 check_property(
1837 code_attribute_length == sizeof(u2) + length_in_bytes,
1838 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1839
1840 cfs->guarantee_more(length_in_bytes, CHECK);
1841
1842 if ((*write_stream) == NULL) {
1843 if (length_in_bytes > fixed_buffer_size) {
1844 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1845 } else {
1846 (*write_stream) = new CompressedLineNumberWriteStream(
1847 _linenumbertable_buffer, fixed_buffer_size);
1848 }
1849 }
1850
1851 while (num_entries-- > 0) {
1852 const u2 bci = cfs->get_u2_fast(); // start_pc
1853 const u2 line = cfs->get_u2_fast(); // line_number
1854 guarantee_property(bci < code_length,
1855 "Invalid pc in LineNumberTable in class file %s", CHECK);
1856 (*write_stream)->write_pair(bci, line);
1857 }
1858 }
1859
1860
1861 class LVT_Hash : public AllStatic {
1862 public:
1863
1864 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1865 /*
1866 * 3-tuple start_bci/length/slot has to be unique key,
1867 * so the following comparison seems to be redundant:
1868 * && elem->name_cp_index == entry->_elem->name_cp_index
1869 */
1870 return (e0.start_bci == e1.start_bci &&
1871 e0.length == e1.length &&
1872 e0.name_cp_index == e1.name_cp_index &&
1873 e0.slot == e1.slot);
1874 }
1875
1876 static unsigned int hash(LocalVariableTableElement const& e0) {
1877 unsigned int raw_hash = e0.start_bci;
1878
1879 raw_hash = e0.length + raw_hash * 37;
1880 raw_hash = e0.name_cp_index + raw_hash * 37;
1881 raw_hash = e0.slot + raw_hash * 37;
1882
1883 return raw_hash;
1884 }
1885 };
1886
1887
1888 // Class file LocalVariableTable elements.
1889 class Classfile_LVT_Element {
1890 public:
1891 u2 start_bci;
1892 u2 length;
1893 u2 name_cp_index;
1894 u2 descriptor_cp_index;
1895 u2 slot;
1896 };
1897
1898 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1899 LocalVariableTableElement* const lvt) {
1900 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1901 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1902 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1903 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1904 lvt->signature_cp_index = 0;
1905 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1906 }
1907
1908 // Function is used to parse both attributes:
1909 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1910 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1911 u4 code_length,
1912 u2 max_locals,
1913 u4 code_attribute_length,
1914 u2* const localvariable_table_length,
1915 bool isLVTT,
1916 TRAPS) {
1917 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1918 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1919 const unsigned int size =
1920 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1921
1922 const ConstantPool* const cp = _cp;
1923
1924 // Verify local variable table attribute has right length
1925 if (_need_verify) {
1926 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1927 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1928 }
1929
1930 const unsafe_u2* const localvariable_table_start = cfs->current();
1931 assert(localvariable_table_start != NULL, "null local variable table");
1932 if (!_need_verify) {
1933 cfs->skip_u2_fast(size);
1934 } else {
1935 cfs->guarantee_more(size * 2, CHECK_NULL);
1936 for(int i = 0; i < (*localvariable_table_length); i++) {
1937 const u2 start_pc = cfs->get_u2_fast();
1938 const u2 length = cfs->get_u2_fast();
1939 const u2 name_index = cfs->get_u2_fast();
1940 const u2 descriptor_index = cfs->get_u2_fast();
1941 const u2 index = cfs->get_u2_fast();
1942 // Assign to a u4 to avoid overflow
1943 const u4 end_pc = (u4)start_pc + (u4)length;
1944
1945 if (start_pc >= code_length) {
1946 classfile_parse_error(
1947 "Invalid start_pc %u in %s in class file %s",
1948 start_pc, tbl_name, CHECK_NULL);
1949 }
1950 if (end_pc > code_length) {
1951 classfile_parse_error(
1952 "Invalid length %u in %s in class file %s",
1953 length, tbl_name, CHECK_NULL);
1954 }
1955 const int cp_size = cp->length();
1956 guarantee_property(valid_symbol_at(name_index),
1957 "Name index %u in %s has bad constant type in class file %s",
1958 name_index, tbl_name, CHECK_NULL);
1959 guarantee_property(valid_symbol_at(descriptor_index),
1960 "Signature index %u in %s has bad constant type in class file %s",
1961 descriptor_index, tbl_name, CHECK_NULL);
1962
1963 const Symbol* const name = cp->symbol_at(name_index);
1964 const Symbol* const sig = cp->symbol_at(descriptor_index);
1965 verify_legal_field_name(name, CHECK_NULL);
1966 u2 extra_slot = 0;
1967 if (!isLVTT) {
1968 verify_legal_field_signature(name, sig, CHECK_NULL);
1969
1970 // 4894874: check special cases for double and long local variables
1971 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1972 sig == vmSymbols::type_signature(T_LONG)) {
1973 extra_slot = 1;
1974 }
1975 }
1976 guarantee_property((index + extra_slot) < max_locals,
1977 "Invalid index %u in %s in class file %s",
1978 index, tbl_name, CHECK_NULL);
1979 }
1980 }
1981 return localvariable_table_start;
1982 }
1983
1984 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1985 u4 code_attribute_length,
1986 bool need_verify,
1987 TRAPS) {
1988 assert(cfs != NULL, "invariant");
1989
1990 if (0 == code_attribute_length) {
1991 return NULL;
1992 }
1993
1994 const u1* const stackmap_table_start = cfs->current();
1995 assert(stackmap_table_start != NULL, "null stackmap table");
1996
1997 // check code_attribute_length first
1998 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1999
2000 if (!need_verify && !DumpSharedSpaces) {
2001 return NULL;
2002 }
2003 return stackmap_table_start;
2004 }
2005
2006 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2007 u2* const checked_exceptions_length,
2008 u4 method_attribute_length,
2009 TRAPS) {
2010 assert(cfs != NULL, "invariant");
2011 assert(checked_exceptions_length != NULL, "invariant");
2012
2013 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2014 *checked_exceptions_length = cfs->get_u2_fast();
2015 const unsigned int size =
2016 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2017 const unsafe_u2* const checked_exceptions_start = cfs->current();
2018 assert(checked_exceptions_start != NULL, "null checked exceptions");
2019 if (!_need_verify) {
2020 cfs->skip_u2_fast(size);
2021 } else {
2022 // Verify each value in the checked exception table
2023 u2 checked_exception;
2024 const u2 len = *checked_exceptions_length;
2025 cfs->guarantee_more(2 * len, CHECK_NULL);
2026 for (int i = 0; i < len; i++) {
2027 checked_exception = cfs->get_u2_fast();
2028 check_property(
2029 valid_klass_reference_at(checked_exception),
2030 "Exception name has bad type at constant pool %u in class file %s",
2031 checked_exception, CHECK_NULL);
2032 }
2033 }
2034 // check exceptions attribute length
2035 if (_need_verify) {
2036 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2037 sizeof(u2) * size),
2038 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2039 }
2040 return checked_exceptions_start;
2041 }
2042
2043 void ClassFileParser::throwIllegalSignature(const char* type,
2044 const Symbol* name,
2045 const Symbol* sig,
2046 TRAPS) const {
2047 assert(name != NULL, "invariant");
2048 assert(sig != NULL, "invariant");
2049
2050 ResourceMark rm(THREAD);
2051 Exceptions::fthrow(THREAD_AND_LOCATION,
2052 vmSymbols::java_lang_ClassFormatError(),
2053 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2054 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2055 }
2056
2057 AnnotationCollector::ID
2058 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2059 const Symbol* name) {
2060 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2061 // Privileged code can use all annotations. Other code silently drops some.
2062 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2063 loader_data->is_platform_class_loader_data() ||
2064 loader_data->is_unsafe_anonymous();
2065 switch (sid) {
2066 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2067 if (_location != _in_method) break; // only allow for methods
2068 if (!privileged) break; // only allow in privileged code
2069 return _method_CallerSensitive;
2070 }
2071 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2072 if (_location != _in_method) break; // only allow for methods
2073 if (!privileged) break; // only allow in privileged code
2074 return _method_ForceInline;
2075 }
2076 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2077 if (_location != _in_method) break; // only allow for methods
2078 if (!privileged) break; // only allow in privileged code
2079 return _method_DontInline;
2080 }
2081 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2082 if (_location != _in_method) break; // only allow for methods
2083 if (!privileged) break; // only allow in privileged code
2084 return _method_InjectedProfile;
2085 }
2086 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2087 if (_location != _in_method) break; // only allow for methods
2088 if (!privileged) break; // only allow in privileged code
2089 return _method_LambdaForm_Compiled;
2090 }
2091 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
2092 if (_location != _in_method) break; // only allow for methods
2093 if (!privileged) break; // only allow in privileged code
2094 return _method_Hidden;
2095 }
2096 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2097 if (_location != _in_method) break; // only allow for methods
2098 if (!privileged) break; // only allow in privileged code
2099 return _method_HotSpotIntrinsicCandidate;
2100 }
2101 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2102 if (_location != _in_field) break; // only allow for fields
2103 if (!privileged) break; // only allow in privileged code
2104 return _field_Stable;
2105 }
2106 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2107 if (_location != _in_field && _location != _in_class) {
2108 break; // only allow for fields and classes
2109 }
2110 if (!EnableContended || (RestrictContended && !privileged)) {
2111 break; // honor privileges
2112 }
2113 return _jdk_internal_vm_annotation_Contended;
2114 }
2115 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2116 if (_location != _in_method) break; // only allow for methods
2117 if (RestrictReservedStack && !privileged) break; // honor privileges
2118 return _jdk_internal_vm_annotation_ReservedStackAccess;
2119 }
2120 default: {
2121 break;
2122 }
2123 }
2124 return AnnotationCollector::_unknown;
2125 }
2126
2127 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2128 if (is_contended())
2129 f->set_contended_group(contended_group());
2130 if (is_stable())
2131 f->set_stable(true);
2132 }
2133
2134 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2135 // If there's an error deallocate metadata for field annotations
2136 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2137 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2138 }
2139
2140 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2141 if (has_annotation(_method_CallerSensitive))
2142 m->set_caller_sensitive(true);
2143 if (has_annotation(_method_ForceInline))
2144 m->set_force_inline(true);
2145 if (has_annotation(_method_DontInline))
2146 m->set_dont_inline(true);
2147 if (has_annotation(_method_InjectedProfile))
2148 m->set_has_injected_profile(true);
2149 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2150 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2151 if (has_annotation(_method_Hidden))
2152 m->set_hidden(true);
2153 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2154 m->set_intrinsic_candidate(true);
2155 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2156 m->set_has_reserved_stack_access(true);
2157 }
2158
2159 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2160 assert(ik != NULL, "invariant");
2161 ik->set_is_contended(is_contended());
2162 }
2163
2164 #define MAX_ARGS_SIZE 255
2165 #define MAX_CODE_SIZE 65535
2166 #define INITIAL_MAX_LVT_NUMBER 256
2167
2168 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2169 *
2170 * Rules for LVT's and LVTT's are:
2171 * - There can be any number of LVT's and LVTT's.
2172 * - If there are n LVT's, it is the same as if there was just
2173 * one LVT containing all the entries from the n LVT's.
2174 * - There may be no more than one LVT entry per local variable.
2175 * Two LVT entries are 'equal' if these fields are the same:
2176 * start_pc, length, name, slot
2177 * - There may be no more than one LVTT entry per each LVT entry.
2178 * Each LVTT entry has to match some LVT entry.
2179 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2180 */
2181 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2182 int lvt_cnt,
2183 u2* const localvariable_table_length,
2184 const unsafe_u2** const localvariable_table_start,
2185 int lvtt_cnt,
2186 u2* const localvariable_type_table_length,
2187 const unsafe_u2** const localvariable_type_table_start,
2188 TRAPS) {
2189
2190 ResourceMark rm(THREAD);
2191
2192 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2193 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2194
2195 LVT_HashTable* const table = new LVT_HashTable();
2196
2197 // To fill LocalVariableTable in
2198 const Classfile_LVT_Element* cf_lvt;
2199 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2200
2201 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2202 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2203 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2204 copy_lvt_element(&cf_lvt[idx], lvt);
2205 // If no duplicates, add LVT elem in hashtable.
2206 if (table->put(*lvt, lvt) == false
2207 && _need_verify
2208 && _major_version >= JAVA_1_5_VERSION) {
2209 classfile_parse_error("Duplicated LocalVariableTable attribute "
2210 "entry for '%s' in class file %s",
2211 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2212 CHECK);
2213 }
2214 }
2215 }
2216
2217 // To merge LocalVariableTable and LocalVariableTypeTable
2218 const Classfile_LVT_Element* cf_lvtt;
2219 LocalVariableTableElement lvtt_elem;
2220
2221 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2222 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2223 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2224 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2225 LocalVariableTableElement** entry = table->get(lvtt_elem);
2226 if (entry == NULL) {
2227 if (_need_verify) {
2228 classfile_parse_error("LVTT entry for '%s' in class file %s "
2229 "does not match any LVT entry",
2230 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2231 CHECK);
2232 }
2233 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2234 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2235 "entry for '%s' in class file %s",
2236 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2237 CHECK);
2238 } else {
2239 // to add generic signatures into LocalVariableTable
2240 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2241 }
2242 }
2243 }
2244 }
2245
2246
2247 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2248 const u1* runtime_visible_annotations,
2249 int runtime_visible_annotations_length,
2250 const u1* runtime_invisible_annotations,
2251 int runtime_invisible_annotations_length,
2252 const u1* runtime_visible_parameter_annotations,
2253 int runtime_visible_parameter_annotations_length,
2254 const u1* runtime_invisible_parameter_annotations,
2255 int runtime_invisible_parameter_annotations_length,
2256 const u1* runtime_visible_type_annotations,
2257 int runtime_visible_type_annotations_length,
2258 const u1* runtime_invisible_type_annotations,
2259 int runtime_invisible_type_annotations_length,
2260 const u1* annotation_default,
2261 int annotation_default_length,
2262 TRAPS) {
2263
2264 AnnotationArray* a;
2265
2266 if (runtime_visible_annotations_length +
2267 runtime_invisible_annotations_length > 0) {
2268 a = assemble_annotations(runtime_visible_annotations,
2269 runtime_visible_annotations_length,
2270 runtime_invisible_annotations,
2271 runtime_invisible_annotations_length,
2272 CHECK);
2273 cm->set_method_annotations(a);
2274 }
2275
2276 if (runtime_visible_parameter_annotations_length +
2277 runtime_invisible_parameter_annotations_length > 0) {
2278 a = assemble_annotations(runtime_visible_parameter_annotations,
2279 runtime_visible_parameter_annotations_length,
2280 runtime_invisible_parameter_annotations,
2281 runtime_invisible_parameter_annotations_length,
2282 CHECK);
2283 cm->set_parameter_annotations(a);
2284 }
2285
2286 if (annotation_default_length > 0) {
2287 a = assemble_annotations(annotation_default,
2288 annotation_default_length,
2289 NULL,
2290 0,
2291 CHECK);
2292 cm->set_default_annotations(a);
2293 }
2294
2295 if (runtime_visible_type_annotations_length +
2296 runtime_invisible_type_annotations_length > 0) {
2297 a = assemble_annotations(runtime_visible_type_annotations,
2298 runtime_visible_type_annotations_length,
2299 runtime_invisible_type_annotations,
2300 runtime_invisible_type_annotations_length,
2301 CHECK);
2302 cm->set_type_annotations(a);
2303 }
2304 }
2305
2306
2307 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2308 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2309 // Method* to save footprint, so we only know the size of the resulting Method* when the
2310 // entire method attribute is parsed.
2311 //
2312 // The promoted_flags parameter is used to pass relevant access_flags
2313 // from the method back up to the containing klass. These flag values
2314 // are added to klass's access_flags.
2315
2316 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2317 bool is_interface,
2318 const ConstantPool* cp,
2319 AccessFlags* const promoted_flags,
2320 TRAPS) {
2321 assert(cfs != NULL, "invariant");
2322 assert(cp != NULL, "invariant");
2323 assert(promoted_flags != NULL, "invariant");
2324
2325 ResourceMark rm(THREAD);
2326 // Parse fixed parts:
2327 // access_flags, name_index, descriptor_index, attributes_count
2328 cfs->guarantee_more(8, CHECK_NULL);
2329
2330 int flags = cfs->get_u2_fast();
2331 const u2 name_index = cfs->get_u2_fast();
2332 const int cp_size = cp->length();
2333 check_property(
2334 valid_symbol_at(name_index),
2335 "Illegal constant pool index %u for method name in class file %s",
2336 name_index, CHECK_NULL);
2337 const Symbol* const name = cp->symbol_at(name_index);
2338 verify_legal_method_name(name, CHECK_NULL);
2339
2340 const u2 signature_index = cfs->get_u2_fast();
2341 guarantee_property(
2342 valid_symbol_at(signature_index),
2343 "Illegal constant pool index %u for method signature in class file %s",
2344 signature_index, CHECK_NULL);
2345 const Symbol* const signature = cp->symbol_at(signature_index);
2346
2347 if (name == vmSymbols::class_initializer_name()) {
2348 // We ignore the other access flags for a valid class initializer.
2349 // (JVM Spec 2nd ed., chapter 4.6)
2350 if (_major_version < 51) { // backward compatibility
2351 flags = JVM_ACC_STATIC;
2352 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2353 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2354 } else {
2355 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2356 }
2357 } else {
2358 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2359 }
2360
2361 if (name == vmSymbols::object_initializer_name() && is_interface) {
2362 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2363 }
2364
2365 int args_size = -1; // only used when _need_verify is true
2366 if (_need_verify) {
2367 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2368 verify_legal_method_signature(name, signature, CHECK_NULL);
2369 if (args_size > MAX_ARGS_SIZE) {
2370 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2371 }
2372 }
2373
2374 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2375
2376 // Default values for code and exceptions attribute elements
2377 u2 max_stack = 0;
2378 u2 max_locals = 0;
2379 u4 code_length = 0;
2380 const u1* code_start = 0;
2381 u2 exception_table_length = 0;
2382 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2383 Array<int>* exception_handlers = Universe::the_empty_int_array();
2384 u2 checked_exceptions_length = 0;
2385 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2386 CompressedLineNumberWriteStream* linenumber_table = NULL;
2387 int linenumber_table_length = 0;
2388 int total_lvt_length = 0;
2389 u2 lvt_cnt = 0;
2390 u2 lvtt_cnt = 0;
2391 bool lvt_allocated = false;
2392 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2393 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2394 u2* localvariable_table_length = NULL;
2395 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2396 u2* localvariable_type_table_length = NULL;
2397 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2398 int method_parameters_length = -1;
2399 const u1* method_parameters_data = NULL;
2400 bool method_parameters_seen = false;
2401 bool parsed_code_attribute = false;
2402 bool parsed_checked_exceptions_attribute = false;
2403 bool parsed_stackmap_attribute = false;
2404 // stackmap attribute - JDK1.5
2405 const u1* stackmap_data = NULL;
2406 int stackmap_data_length = 0;
2407 u2 generic_signature_index = 0;
2408 MethodAnnotationCollector parsed_annotations;
2409 const u1* runtime_visible_annotations = NULL;
2410 int runtime_visible_annotations_length = 0;
2411 const u1* runtime_invisible_annotations = NULL;
2412 int runtime_invisible_annotations_length = 0;
2413 const u1* runtime_visible_parameter_annotations = NULL;
2414 int runtime_visible_parameter_annotations_length = 0;
2415 const u1* runtime_invisible_parameter_annotations = NULL;
2416 int runtime_invisible_parameter_annotations_length = 0;
2417 const u1* runtime_visible_type_annotations = NULL;
2418 int runtime_visible_type_annotations_length = 0;
2419 const u1* runtime_invisible_type_annotations = NULL;
2420 int runtime_invisible_type_annotations_length = 0;
2421 bool runtime_invisible_annotations_exists = false;
2422 bool runtime_invisible_type_annotations_exists = false;
2423 bool runtime_invisible_parameter_annotations_exists = false;
2424 const u1* annotation_default = NULL;
2425 int annotation_default_length = 0;
2426
2427 // Parse code and exceptions attribute
2428 u2 method_attributes_count = cfs->get_u2_fast();
2429 while (method_attributes_count--) {
2430 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2431 const u2 method_attribute_name_index = cfs->get_u2_fast();
2432 const u4 method_attribute_length = cfs->get_u4_fast();
2433 check_property(
2434 valid_symbol_at(method_attribute_name_index),
2435 "Invalid method attribute name index %u in class file %s",
2436 method_attribute_name_index, CHECK_NULL);
2437
2438 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2439 if (method_attribute_name == vmSymbols::tag_code()) {
2440 // Parse Code attribute
2441 if (_need_verify) {
2442 guarantee_property(
2443 !access_flags.is_native() && !access_flags.is_abstract(),
2444 "Code attribute in native or abstract methods in class file %s",
2445 CHECK_NULL);
2446 }
2447 if (parsed_code_attribute) {
2448 classfile_parse_error("Multiple Code attributes in class file %s",
2449 CHECK_NULL);
2450 }
2451 parsed_code_attribute = true;
2452
2453 // Stack size, locals size, and code size
2454 cfs->guarantee_more(8, CHECK_NULL);
2455 max_stack = cfs->get_u2_fast();
2456 max_locals = cfs->get_u2_fast();
2457 code_length = cfs->get_u4_fast();
2458 if (_need_verify) {
2459 guarantee_property(args_size <= max_locals,
2460 "Arguments can't fit into locals in class file %s",
2461 CHECK_NULL);
2462 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2463 "Invalid method Code length %u in class file %s",
2464 code_length, CHECK_NULL);
2465 }
2466 // Code pointer
2467 code_start = cfs->current();
2468 assert(code_start != NULL, "null code start");
2469 cfs->guarantee_more(code_length, CHECK_NULL);
2470 cfs->skip_u1_fast(code_length);
2471
2472 // Exception handler table
2473 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2474 exception_table_length = cfs->get_u2_fast();
2475 if (exception_table_length > 0) {
2476 exception_table_start = parse_exception_table(cfs,
2477 code_length,
2478 exception_table_length,
2479 CHECK_NULL);
2480 }
2481
2482 // Parse additional attributes in code attribute
2483 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2484 u2 code_attributes_count = cfs->get_u2_fast();
2485
2486 unsigned int calculated_attribute_length = 0;
2487
2488 calculated_attribute_length =
2489 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2490 calculated_attribute_length +=
2491 code_length +
2492 sizeof(exception_table_length) +
2493 sizeof(code_attributes_count) +
2494 exception_table_length *
2495 ( sizeof(u2) + // start_pc
2496 sizeof(u2) + // end_pc
2497 sizeof(u2) + // handler_pc
2498 sizeof(u2) ); // catch_type_index
2499
2500 while (code_attributes_count--) {
2501 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2502 const u2 code_attribute_name_index = cfs->get_u2_fast();
2503 const u4 code_attribute_length = cfs->get_u4_fast();
2504 calculated_attribute_length += code_attribute_length +
2505 sizeof(code_attribute_name_index) +
2506 sizeof(code_attribute_length);
2507 check_property(valid_symbol_at(code_attribute_name_index),
2508 "Invalid code attribute name index %u in class file %s",
2509 code_attribute_name_index,
2510 CHECK_NULL);
2511 if (LoadLineNumberTables &&
2512 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2513 // Parse and compress line number table
2514 parse_linenumber_table(code_attribute_length,
2515 code_length,
2516 &linenumber_table,
2517 CHECK_NULL);
2518
2519 } else if (LoadLocalVariableTables &&
2520 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2521 // Parse local variable table
2522 if (!lvt_allocated) {
2523 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2524 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2525 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2526 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2527 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2528 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2529 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2530 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2531 lvt_allocated = true;
2532 }
2533 if (lvt_cnt == max_lvt_cnt) {
2534 max_lvt_cnt <<= 1;
2535 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2536 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2537 }
2538 localvariable_table_start[lvt_cnt] =
2539 parse_localvariable_table(cfs,
2540 code_length,
2541 max_locals,
2542 code_attribute_length,
2543 &localvariable_table_length[lvt_cnt],
2544 false, // is not LVTT
2545 CHECK_NULL);
2546 total_lvt_length += localvariable_table_length[lvt_cnt];
2547 lvt_cnt++;
2548 } else if (LoadLocalVariableTypeTables &&
2549 _major_version >= JAVA_1_5_VERSION &&
2550 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2551 if (!lvt_allocated) {
2552 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2553 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2554 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2555 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2556 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2557 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2558 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2559 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2560 lvt_allocated = true;
2561 }
2562 // Parse local variable type table
2563 if (lvtt_cnt == max_lvtt_cnt) {
2564 max_lvtt_cnt <<= 1;
2565 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2566 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2567 }
2568 localvariable_type_table_start[lvtt_cnt] =
2569 parse_localvariable_table(cfs,
2570 code_length,
2571 max_locals,
2572 code_attribute_length,
2573 &localvariable_type_table_length[lvtt_cnt],
2574 true, // is LVTT
2575 CHECK_NULL);
2576 lvtt_cnt++;
2577 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2578 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2579 // Stack map is only needed by the new verifier in JDK1.5.
2580 if (parsed_stackmap_attribute) {
2581 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2582 }
2583 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2584 stackmap_data_length = code_attribute_length;
2585 parsed_stackmap_attribute = true;
2586 } else {
2587 // Skip unknown attributes
2588 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2589 }
2590 }
2591 // check method attribute length
2592 if (_need_verify) {
2593 guarantee_property(method_attribute_length == calculated_attribute_length,
2594 "Code segment has wrong length in class file %s",
2595 CHECK_NULL);
2596 }
2597 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2598 // Parse Exceptions attribute
2599 if (parsed_checked_exceptions_attribute) {
2600 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2601 CHECK_NULL);
2602 }
2603 parsed_checked_exceptions_attribute = true;
2604 checked_exceptions_start =
2605 parse_checked_exceptions(cfs,
2606 &checked_exceptions_length,
2607 method_attribute_length,
2608 CHECK_NULL);
2609 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2610 // reject multiple method parameters
2611 if (method_parameters_seen) {
2612 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2613 CHECK_NULL);
2614 }
2615 method_parameters_seen = true;
2616 method_parameters_length = cfs->get_u1_fast();
2617 const u2 real_length = (method_parameters_length * 4u) + 1u;
2618 if (method_attribute_length != real_length) {
2619 classfile_parse_error(
2620 "Invalid MethodParameters method attribute length %u in class file",
2621 method_attribute_length, CHECK_NULL);
2622 }
2623 method_parameters_data = cfs->current();
2624 cfs->skip_u2_fast(method_parameters_length);
2625 cfs->skip_u2_fast(method_parameters_length);
2626 // ignore this attribute if it cannot be reflected
2627 if (!SystemDictionary::Parameter_klass_loaded())
2628 method_parameters_length = -1;
2629 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2630 if (method_attribute_length != 0) {
2631 classfile_parse_error(
2632 "Invalid Synthetic method attribute length %u in class file %s",
2633 method_attribute_length, CHECK_NULL);
2634 }
2635 // Should we check that there hasn't already been a synthetic attribute?
2636 access_flags.set_is_synthetic();
2637 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2638 if (method_attribute_length != 0) {
2639 classfile_parse_error(
2640 "Invalid Deprecated method attribute length %u in class file %s",
2641 method_attribute_length, CHECK_NULL);
2642 }
2643 } else if (_major_version >= JAVA_1_5_VERSION) {
2644 if (method_attribute_name == vmSymbols::tag_signature()) {
2645 if (generic_signature_index != 0) {
2646 classfile_parse_error(
2647 "Multiple Signature attributes for method in class file %s",
2648 CHECK_NULL);
2649 }
2650 if (method_attribute_length != 2) {
2651 classfile_parse_error(
2652 "Invalid Signature attribute length %u in class file %s",
2653 method_attribute_length, CHECK_NULL);
2654 }
2655 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2656 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2657 if (runtime_visible_annotations != NULL) {
2658 classfile_parse_error(
2659 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2660 CHECK_NULL);
2661 }
2662 runtime_visible_annotations_length = method_attribute_length;
2663 runtime_visible_annotations = cfs->current();
2664 assert(runtime_visible_annotations != NULL, "null visible annotations");
2665 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2666 parse_annotations(cp,
2667 runtime_visible_annotations,
2668 runtime_visible_annotations_length,
2669 &parsed_annotations,
2670 _loader_data,
2671 CHECK_NULL);
2672 cfs->skip_u1_fast(runtime_visible_annotations_length);
2673 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2674 if (runtime_invisible_annotations_exists) {
2675 classfile_parse_error(
2676 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2677 CHECK_NULL);
2678 }
2679 runtime_invisible_annotations_exists = true;
2680 if (PreserveAllAnnotations) {
2681 runtime_invisible_annotations_length = method_attribute_length;
2682 runtime_invisible_annotations = cfs->current();
2683 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2684 }
2685 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2686 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2687 if (runtime_visible_parameter_annotations != NULL) {
2688 classfile_parse_error(
2689 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2690 CHECK_NULL);
2691 }
2692 runtime_visible_parameter_annotations_length = method_attribute_length;
2693 runtime_visible_parameter_annotations = cfs->current();
2694 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2695 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2696 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2697 if (runtime_invisible_parameter_annotations_exists) {
2698 classfile_parse_error(
2699 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2700 CHECK_NULL);
2701 }
2702 runtime_invisible_parameter_annotations_exists = true;
2703 if (PreserveAllAnnotations) {
2704 runtime_invisible_parameter_annotations_length = method_attribute_length;
2705 runtime_invisible_parameter_annotations = cfs->current();
2706 assert(runtime_invisible_parameter_annotations != NULL,
2707 "null invisible parameter annotations");
2708 }
2709 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2710 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2711 if (annotation_default != NULL) {
2712 classfile_parse_error(
2713 "Multiple AnnotationDefault attributes for method in class file %s",
2714 CHECK_NULL);
2715 }
2716 annotation_default_length = method_attribute_length;
2717 annotation_default = cfs->current();
2718 assert(annotation_default != NULL, "null annotation default");
2719 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2720 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2721 if (runtime_visible_type_annotations != NULL) {
2722 classfile_parse_error(
2723 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2724 CHECK_NULL);
2725 }
2726 runtime_visible_type_annotations_length = method_attribute_length;
2727 runtime_visible_type_annotations = cfs->current();
2728 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2729 // No need for the VM to parse Type annotations
2730 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2731 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2732 if (runtime_invisible_type_annotations_exists) {
2733 classfile_parse_error(
2734 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2735 CHECK_NULL);
2736 } else {
2737 runtime_invisible_type_annotations_exists = true;
2738 }
2739 if (PreserveAllAnnotations) {
2740 runtime_invisible_type_annotations_length = method_attribute_length;
2741 runtime_invisible_type_annotations = cfs->current();
2742 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2743 }
2744 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2745 } else {
2746 // Skip unknown attributes
2747 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2748 }
2749 } else {
2750 // Skip unknown attributes
2751 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2752 }
2753 }
2754
2755 if (linenumber_table != NULL) {
2756 linenumber_table->write_terminator();
2757 linenumber_table_length = linenumber_table->position();
2758 }
2759
2760 // Make sure there's at least one Code attribute in non-native/non-abstract method
2761 if (_need_verify) {
2762 guarantee_property(access_flags.is_native() ||
2763 access_flags.is_abstract() ||
2764 parsed_code_attribute,
2765 "Absent Code attribute in method that is not native or abstract in class file %s",
2766 CHECK_NULL);
2767 }
2768
2769 // All sizing information for a Method* is finally available, now create it
2770 InlineTableSizes sizes(
2771 total_lvt_length,
2772 linenumber_table_length,
2773 exception_table_length,
2774 checked_exceptions_length,
2775 method_parameters_length,
2776 generic_signature_index,
2777 runtime_visible_annotations_length +
2778 runtime_invisible_annotations_length,
2779 runtime_visible_parameter_annotations_length +
2780 runtime_invisible_parameter_annotations_length,
2781 runtime_visible_type_annotations_length +
2782 runtime_invisible_type_annotations_length,
2783 annotation_default_length,
2784 0);
2785
2786 Method* const m = Method::allocate(_loader_data,
2787 code_length,
2788 access_flags,
2789 &sizes,
2790 ConstMethod::NORMAL,
2791 CHECK_NULL);
2792
2793 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2794
2795 // Fill in information from fixed part (access_flags already set)
2796 m->set_constants(_cp);
2797 m->set_name_index(name_index);
2798 m->set_signature_index(signature_index);
2799
2800 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2801 m->constMethod()->set_result_type(rtf.type());
2802
2803 if (args_size >= 0) {
2804 m->set_size_of_parameters(args_size);
2805 } else {
2806 m->compute_size_of_parameters(THREAD);
2807 }
2808 #ifdef ASSERT
2809 if (args_size >= 0) {
2810 m->compute_size_of_parameters(THREAD);
2811 assert(args_size == m->size_of_parameters(), "");
2812 }
2813 #endif
2814
2815 // Fill in code attribute information
2816 m->set_max_stack(max_stack);
2817 m->set_max_locals(max_locals);
2818 if (stackmap_data != NULL) {
2819 m->constMethod()->copy_stackmap_data(_loader_data,
2820 (u1*)stackmap_data,
2821 stackmap_data_length,
2822 CHECK_NULL);
2823 }
2824
2825 // Copy byte codes
2826 m->set_code((u1*)code_start);
2827
2828 // Copy line number table
2829 if (linenumber_table != NULL) {
2830 memcpy(m->compressed_linenumber_table(),
2831 linenumber_table->buffer(),
2832 linenumber_table_length);
2833 }
2834
2835 // Copy exception table
2836 if (exception_table_length > 0) {
2837 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2838 m->exception_table_start(),
2839 exception_table_length * sizeof(ExceptionTableElement),
2840 sizeof(u2));
2841 }
2842
2843 // Copy method parameters
2844 if (method_parameters_length > 0) {
2845 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2846 for (int i = 0; i < method_parameters_length; i++) {
2847 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2848 method_parameters_data += 2;
2849 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2850 method_parameters_data += 2;
2851 }
2852 }
2853
2854 // Copy checked exceptions
2855 if (checked_exceptions_length > 0) {
2856 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2857 m->checked_exceptions_start(),
2858 checked_exceptions_length * sizeof(CheckedExceptionElement),
2859 sizeof(u2));
2860 }
2861
2862 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2863 if (total_lvt_length > 0) {
2864 promoted_flags->set_has_localvariable_table();
2865 copy_localvariable_table(m->constMethod(),
2866 lvt_cnt,
2867 localvariable_table_length,
2868 localvariable_table_start,
2869 lvtt_cnt,
2870 localvariable_type_table_length,
2871 localvariable_type_table_start,
2872 CHECK_NULL);
2873 }
2874
2875 if (parsed_annotations.has_any_annotations())
2876 parsed_annotations.apply_to(methodHandle(THREAD, m));
2877
2878 // Copy annotations
2879 copy_method_annotations(m->constMethod(),
2880 runtime_visible_annotations,
2881 runtime_visible_annotations_length,
2882 runtime_invisible_annotations,
2883 runtime_invisible_annotations_length,
2884 runtime_visible_parameter_annotations,
2885 runtime_visible_parameter_annotations_length,
2886 runtime_invisible_parameter_annotations,
2887 runtime_invisible_parameter_annotations_length,
2888 runtime_visible_type_annotations,
2889 runtime_visible_type_annotations_length,
2890 runtime_invisible_type_annotations,
2891 runtime_invisible_type_annotations_length,
2892 annotation_default,
2893 annotation_default_length,
2894 CHECK_NULL);
2895
2896 if (name == vmSymbols::finalize_method_name() &&
2897 signature == vmSymbols::void_method_signature()) {
2898 if (m->is_empty_method()) {
2899 _has_empty_finalizer = true;
2900 } else {
2901 _has_finalizer = true;
2902 }
2903 }
2904 if (name == vmSymbols::object_initializer_name() &&
2905 signature == vmSymbols::void_method_signature() &&
2906 m->is_vanilla_constructor()) {
2907 _has_vanilla_constructor = true;
2908 }
2909
2910 NOT_PRODUCT(m->verify());
2911 return m;
2912 }
2913
2914
2915 // The promoted_flags parameter is used to pass relevant access_flags
2916 // from the methods back up to the containing klass. These flag values
2917 // are added to klass's access_flags.
2918 // Side-effects: populates the _methods field in the parser
2919 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2920 bool is_interface,
2921 AccessFlags* promoted_flags,
2922 bool* has_final_method,
2923 bool* declares_nonstatic_concrete_methods,
2924 TRAPS) {
2925 assert(cfs != NULL, "invariant");
2926 assert(promoted_flags != NULL, "invariant");
2927 assert(has_final_method != NULL, "invariant");
2928 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2929
2930 assert(NULL == _methods, "invariant");
2931
2932 cfs->guarantee_more(2, CHECK); // length
2933 const u2 length = cfs->get_u2_fast();
2934 if (length == 0) {
2935 _methods = Universe::the_empty_method_array();
2936 } else {
2937 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2938 length,
2939 NULL,
2940 CHECK);
2941
2942 for (int index = 0; index < length; index++) {
2943 Method* method = parse_method(cfs,
2944 is_interface,
2945 _cp,
2946 promoted_flags,
2947 CHECK);
2948
2949 if (method->is_final()) {
2950 *has_final_method = true;
2951 }
2952 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2953 // used for interface initialization, and default method inheritance analysis
2954 if (is_interface && !(*declares_nonstatic_concrete_methods)
2955 && !method->is_abstract() && !method->is_static()) {
2956 *declares_nonstatic_concrete_methods = true;
2957 }
2958 _methods->at_put(index, method);
2959 }
2960
2961 if (_need_verify && length > 1) {
2962 // Check duplicated methods
2963 ResourceMark rm(THREAD);
2964 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2965 THREAD, NameSigHash*, HASH_ROW_SIZE);
2966 initialize_hashtable(names_and_sigs);
2967 bool dup = false;
2968 const Symbol* name = NULL;
2969 const Symbol* sig = NULL;
2970 {
2971 debug_only(NoSafepointVerifier nsv;)
2972 for (int i = 0; i < length; i++) {
2973 const Method* const m = _methods->at(i);
2974 name = m->name();
2975 sig = m->signature();
2976 // If no duplicates, add name/signature in hashtable names_and_sigs.
2977 if (!put_after_lookup(name, sig, names_and_sigs)) {
2978 dup = true;
2979 break;
2980 }
2981 }
2982 }
2983 if (dup) {
2984 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2985 name->as_C_string(), sig->as_klass_external_name(), CHECK);
2986 }
2987 }
2988 }
2989 }
2990
2991 static const intArray* sort_methods(Array<Method*>* methods) {
2992 const int length = methods->length();
2993 // If JVMTI original method ordering or sharing is enabled we have to
2994 // remember the original class file ordering.
2995 // We temporarily use the vtable_index field in the Method* to store the
2996 // class file index, so we can read in after calling qsort.
2997 // Put the method ordering in the shared archive.
2998 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) {
2999 for (int index = 0; index < length; index++) {
3000 Method* const m = methods->at(index);
3001 assert(!m->valid_vtable_index(), "vtable index should not be set");
3002 m->set_vtable_index(index);
3003 }
3004 }
3005 // Sort method array by ascending method name (for faster lookups & vtable construction)
3006 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3007 Method::sort_methods(methods);
3008
3009 intArray* method_ordering = NULL;
3010 // If JVMTI original method ordering or sharing is enabled construct int
3011 // array remembering the original ordering
3012 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) {
3013 method_ordering = new intArray(length, length, -1);
3014 for (int index = 0; index < length; index++) {
3015 Method* const m = methods->at(index);
3016 const int old_index = m->vtable_index();
3017 assert(old_index >= 0 && old_index < length, "invalid method index");
3018 method_ordering->at_put(index, old_index);
3019 m->set_vtable_index(Method::invalid_vtable_index);
3020 }
3021 }
3022 return method_ordering;
3023 }
3024
3025 // Parse generic_signature attribute for methods and fields
3026 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3027 TRAPS) {
3028 assert(cfs != NULL, "invariant");
3029
3030 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3031 const u2 generic_signature_index = cfs->get_u2_fast();
3032 check_property(
3033 valid_symbol_at(generic_signature_index),
3034 "Invalid Signature attribute at constant pool index %u in class file %s",
3035 generic_signature_index, CHECK_0);
3036 return generic_signature_index;
3037 }
3038
3039 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3040 TRAPS) {
3041
3042 assert(cfs != NULL, "invariant");
3043
3044 cfs->guarantee_more(2, CHECK); // sourcefile_index
3045 const u2 sourcefile_index = cfs->get_u2_fast();
3046 check_property(
3047 valid_symbol_at(sourcefile_index),
3048 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3049 sourcefile_index, CHECK);
3050 set_class_sourcefile_index(sourcefile_index);
3051 }
3052
3053 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3054 int length,
3055 TRAPS) {
3056 assert(cfs != NULL, "invariant");
3057
3058 const u1* const sde_buffer = cfs->current();
3059 assert(sde_buffer != NULL, "null sde buffer");
3060
3061 // Don't bother storing it if there is no way to retrieve it
3062 if (JvmtiExport::can_get_source_debug_extension()) {
3063 assert((length+1) > length, "Overflow checking");
3064 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3065 for (int i = 0; i < length; i++) {
3066 sde[i] = sde_buffer[i];
3067 }
3068 sde[length] = '\0';
3069 set_class_sde_buffer((const char*)sde, length);
3070 }
3071 // Got utf8 string, set stream position forward
3072 cfs->skip_u1(length, CHECK);
3073 }
3074
3075
3076 // Inner classes can be static, private or protected (classic VM does this)
3077 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3078 JVM_ACC_PRIVATE | \
3079 JVM_ACC_PROTECTED | \
3080 JVM_ACC_STATIC \
3081 )
3082
3083 // Return number of classes in the inner classes attribute table
3084 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3085 const u1* const inner_classes_attribute_start,
3086 bool parsed_enclosingmethod_attribute,
3087 u2 enclosing_method_class_index,
3088 u2 enclosing_method_method_index,
3089 TRAPS) {
3090 const u1* const current_mark = cfs->current();
3091 u2 length = 0;
3092 if (inner_classes_attribute_start != NULL) {
3093 cfs->set_current(inner_classes_attribute_start);
3094 cfs->guarantee_more(2, CHECK_0); // length
3095 length = cfs->get_u2_fast();
3096 }
3097
3098 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3099 // method data:
3100 // [inner_class_info_index,
3101 // outer_class_info_index,
3102 // inner_name_index,
3103 // inner_class_access_flags,
3104 // ...
3105 // enclosing_method_class_index,
3106 // enclosing_method_method_index]
3107 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3108 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3109 _inner_classes = inner_classes;
3110
3111 int index = 0;
3112 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3113 for (int n = 0; n < length; n++) {
3114 // Inner class index
3115 const u2 inner_class_info_index = cfs->get_u2_fast();
3116 check_property(
3117 valid_klass_reference_at(inner_class_info_index),
3118 "inner_class_info_index %u has bad constant type in class file %s",
3119 inner_class_info_index, CHECK_0);
3120 // Outer class index
3121 const u2 outer_class_info_index = cfs->get_u2_fast();
3122 check_property(
3123 outer_class_info_index == 0 ||
3124 valid_klass_reference_at(outer_class_info_index),
3125 "outer_class_info_index %u has bad constant type in class file %s",
3126 outer_class_info_index, CHECK_0);
3127 // Inner class name
3128 const u2 inner_name_index = cfs->get_u2_fast();
3129 check_property(
3130 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3131 "inner_name_index %u has bad constant type in class file %s",
3132 inner_name_index, CHECK_0);
3133 if (_need_verify) {
3134 guarantee_property(inner_class_info_index != outer_class_info_index,
3135 "Class is both outer and inner class in class file %s", CHECK_0);
3136 }
3137 // Access flags
3138 jint flags;
3139 // JVM_ACC_MODULE is defined in JDK-9 and later.
3140 if (_major_version >= JAVA_9_VERSION) {
3141 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3142 } else {
3143 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3144 }
3145 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3146 // Set abstract bit for old class files for backward compatibility
3147 flags |= JVM_ACC_ABSTRACT;
3148 }
3149 verify_legal_class_modifiers(flags, CHECK_0);
3150 AccessFlags inner_access_flags(flags);
3151
3152 inner_classes->at_put(index++, inner_class_info_index);
3153 inner_classes->at_put(index++, outer_class_info_index);
3154 inner_classes->at_put(index++, inner_name_index);
3155 inner_classes->at_put(index++, inner_access_flags.as_short());
3156 }
3157
3158 // 4347400: make sure there's no duplicate entry in the classes array
3159 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3160 for(int i = 0; i < length * 4; i += 4) {
3161 for(int j = i + 4; j < length * 4; j += 4) {
3162 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3163 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3164 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3165 inner_classes->at(i+3) != inner_classes->at(j+3)),
3166 "Duplicate entry in InnerClasses in class file %s",
3167 CHECK_0);
3168 }
3169 }
3170 }
3171
3172 // Set EnclosingMethod class and method indexes.
3173 if (parsed_enclosingmethod_attribute) {
3174 inner_classes->at_put(index++, enclosing_method_class_index);
3175 inner_classes->at_put(index++, enclosing_method_method_index);
3176 }
3177 assert(index == size, "wrong size");
3178
3179 // Restore buffer's current position.
3180 cfs->set_current(current_mark);
3181
3182 return length;
3183 }
3184
3185 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3186 const u1* const nest_members_attribute_start,
3187 TRAPS) {
3188 const u1* const current_mark = cfs->current();
3189 u2 length = 0;
3190 if (nest_members_attribute_start != NULL) {
3191 cfs->set_current(nest_members_attribute_start);
3192 cfs->guarantee_more(2, CHECK_0); // length
3193 length = cfs->get_u2_fast();
3194 }
3195 const int size = length;
3196 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3197 _nest_members = nest_members;
3198
3199 int index = 0;
3200 cfs->guarantee_more(2 * length, CHECK_0);
3201 for (int n = 0; n < length; n++) {
3202 const u2 class_info_index = cfs->get_u2_fast();
3203 check_property(
3204 valid_klass_reference_at(class_info_index),
3205 "Nest member class_info_index %u has bad constant type in class file %s",
3206 class_info_index, CHECK_0);
3207 nest_members->at_put(index++, class_info_index);
3208 }
3209 assert(index == size, "wrong size");
3210
3211 // Restore buffer's current position.
3212 cfs->set_current(current_mark);
3213
3214 return length;
3215 }
3216
3217 // Record {
3218 // u2 attribute_name_index;
3219 // u4 attribute_length;
3220 // u2 components_count;
3221 // component_info components[components_count];
3222 // }
3223 // component_info {
3224 // u2 name_index;
3225 // u2 descriptor_index
3226 // u2 attributes_count;
3227 // attribute_info_attributes[attributes_count];
3228 // }
3229 u2 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3230 const ConstantPool* cp,
3231 const u1* const record_attribute_start,
3232 TRAPS) {
3233 const u1* const current_mark = cfs->current();
3234 int components_count = 0;
3235 unsigned int calculate_attr_size = 0;
3236 if (record_attribute_start != NULL) {
3237 cfs->set_current(record_attribute_start);
3238 cfs->guarantee_more(2, CHECK_0); // num of components
3239 components_count = (int)cfs->get_u2_fast();
3240 calculate_attr_size = 2;
3241 }
3242
3243 Array<RecordComponent*>* const record_components =
3244 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, NULL, CHECK_0);
3245 _record_components = record_components;
3246
3247 for (int x = 0; x < components_count; x++) {
3248 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3249
3250 const u2 name_index = cfs->get_u2_fast();
3251 check_property(valid_symbol_at(name_index),
3252 "Invalid constant pool index %u for name in Record attribute in class file %s",
3253 name_index, CHECK_0);
3254 const Symbol* const name = cp->symbol_at(name_index);
3255 verify_legal_field_name(name, CHECK_0);
3256
3257 const u2 descriptor_index = cfs->get_u2_fast();
3258 check_property(valid_symbol_at(descriptor_index),
3259 "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3260 descriptor_index, CHECK_0);
3261 const Symbol* const descr = cp->symbol_at(descriptor_index);
3262 verify_legal_field_signature(name, descr, CHECK_0);
3263
3264 const u2 attributes_count = cfs->get_u2_fast();
3265 calculate_attr_size += 6;
3266 u2 generic_sig_index = 0;
3267 const u1* runtime_visible_annotations = NULL;
3268 int runtime_visible_annotations_length = 0;
3269 const u1* runtime_invisible_annotations = NULL;
3270 int runtime_invisible_annotations_length = 0;
3271 bool runtime_invisible_annotations_exists = false;
3272 const u1* runtime_visible_type_annotations = NULL;
3273 int runtime_visible_type_annotations_length = 0;
3274 const u1* runtime_invisible_type_annotations = NULL;
3275 int runtime_invisible_type_annotations_length = 0;
3276 bool runtime_invisible_type_annotations_exists = false;
3277
3278 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3279 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored.
3280 for (int y = 0; y < attributes_count; y++) {
3281 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length
3282 const u2 attribute_name_index = cfs->get_u2_fast();
3283 const u4 attribute_length = cfs->get_u4_fast();
3284 calculate_attr_size += 6;
3285 check_property(
3286 valid_symbol_at(attribute_name_index),
3287 "Invalid Record attribute name index %u in class file %s",
3288 attribute_name_index, CHECK_0);
3289
3290 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3291 if (attribute_name == vmSymbols::tag_signature()) {
3292 if (generic_sig_index != 0) {
3293 classfile_parse_error(
3294 "Multiple Signature attributes for Record component in class file %s",
3295 CHECK_0);
3296 }
3297 if (attribute_length != 2) {
3298 classfile_parse_error(
3299 "Invalid Signature attribute length %u in Record component in class file %s",
3300 attribute_length, CHECK_0);
3301 }
3302 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3303
3304 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3305 if (runtime_visible_annotations != NULL) {
3306 classfile_parse_error(
3307 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", CHECK_0);
3308 }
3309 runtime_visible_annotations_length = attribute_length;
3310 runtime_visible_annotations = cfs->current();
3311
3312 assert(runtime_visible_annotations != NULL, "null record component visible annotation");
3313 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3314 cfs->skip_u1_fast(runtime_visible_annotations_length);
3315
3316 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3317 if (runtime_invisible_annotations_exists) {
3318 classfile_parse_error(
3319 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", CHECK_0);
3320 }
3321 runtime_invisible_annotations_exists = true;
3322 if (PreserveAllAnnotations) {
3323 runtime_invisible_annotations_length = attribute_length;
3324 runtime_invisible_annotations = cfs->current();
3325 assert(runtime_invisible_annotations != NULL, "null record component invisible annotation");
3326 }
3327 cfs->skip_u1(attribute_length, CHECK_0);
3328
3329 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3330 if (runtime_visible_type_annotations != NULL) {
3331 classfile_parse_error(
3332 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", CHECK_0);
3333 }
3334 runtime_visible_type_annotations_length = attribute_length;
3335 runtime_visible_type_annotations = cfs->current();
3336
3337 assert(runtime_visible_type_annotations != NULL, "null record component visible type annotation");
3338 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3339 cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3340
3341 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3342 if (runtime_invisible_type_annotations_exists) {
3343 classfile_parse_error(
3344 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", CHECK_0);
3345 }
3346 runtime_invisible_type_annotations_exists = true;
3347 if (PreserveAllAnnotations) {
3348 runtime_invisible_type_annotations_length = attribute_length;
3349 runtime_invisible_type_annotations = cfs->current();
3350 assert(runtime_invisible_type_annotations != NULL, "null record component invisible type annotation");
3351 }
3352 cfs->skip_u1(attribute_length, CHECK_0);
3353
3354 } else {
3355 // Skip unknown attributes
3356 cfs->skip_u1(attribute_length, CHECK_0);
3357 }
3358 calculate_attr_size += attribute_length;
3359 } // End of attributes For loop
3360
3361 AnnotationArray* annotations = assemble_annotations(runtime_visible_annotations,
3362 runtime_visible_annotations_length,
3363 runtime_invisible_annotations,
3364 runtime_invisible_annotations_length,
3365 CHECK_0);
3366 AnnotationArray* type_annotations = assemble_annotations(runtime_visible_type_annotations,
3367 runtime_visible_type_annotations_length,
3368 runtime_invisible_type_annotations,
3369 runtime_invisible_type_annotations_length,
3370 CHECK_0);
3371
3372 RecordComponent* record_component =
3373 RecordComponent::allocate(_loader_data, name_index, descriptor_index,
3374 attributes_count, generic_sig_index,
3375 annotations, type_annotations, CHECK_0);
3376 record_components->at_put(x, record_component);
3377 } // End of component processing loop
3378
3379 // Restore buffer's current position.
3380 cfs->set_current(current_mark);
3381 return calculate_attr_size;
3382 }
3383
3384 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3385 set_class_synthetic_flag(true);
3386 }
3387
3388 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3389 assert(cfs != NULL, "invariant");
3390
3391 const u2 signature_index = cfs->get_u2(CHECK);
3392 check_property(
3393 valid_symbol_at(signature_index),
3394 "Invalid constant pool index %u in Signature attribute in class file %s",
3395 signature_index, CHECK);
3396 set_class_generic_signature_index(signature_index);
3397 }
3398
3399 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3400 ConstantPool* cp,
3401 u4 attribute_byte_length,
3402 TRAPS) {
3403 assert(cfs != NULL, "invariant");
3404 assert(cp != NULL, "invariant");
3405
3406 const u1* const current_start = cfs->current();
3407
3408 guarantee_property(attribute_byte_length >= sizeof(u2),
3409 "Invalid BootstrapMethods attribute length %u in class file %s",
3410 attribute_byte_length,
3411 CHECK);
3412
3413 cfs->guarantee_more(attribute_byte_length, CHECK);
3414
3415 const int attribute_array_length = cfs->get_u2_fast();
3416
3417 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3418 "Short length on BootstrapMethods in class file %s",
3419 CHECK);
3420
3421
3422 // The attribute contains a counted array of counted tuples of shorts,
3423 // represending bootstrap specifiers:
3424 // length*{bootstrap_method_index, argument_count*{argument_index}}
3425 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3426 // operand_count = number of shorts in attr, except for leading length
3427
3428 // The attribute is copied into a short[] array.
3429 // The array begins with a series of short[2] pairs, one for each tuple.
3430 const int index_size = (attribute_array_length * 2);
3431
3432 Array<u2>* const operands =
3433 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3434
3435 // Eagerly assign operands so they will be deallocated with the constant
3436 // pool if there is an error.
3437 cp->set_operands(operands);
3438
3439 int operand_fill_index = index_size;
3440 const int cp_size = cp->length();
3441
3442 for (int n = 0; n < attribute_array_length; n++) {
3443 // Store a 32-bit offset into the header of the operand array.
3444 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3445
3446 // Read a bootstrap specifier.
3447 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3448 const u2 bootstrap_method_index = cfs->get_u2_fast();
3449 const u2 argument_count = cfs->get_u2_fast();
3450 check_property(
3451 valid_cp_range(bootstrap_method_index, cp_size) &&
3452 cp->tag_at(bootstrap_method_index).is_method_handle(),
3453 "bootstrap_method_index %u has bad constant type in class file %s",
3454 bootstrap_method_index,
3455 CHECK);
3456
3457 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3458 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3459 CHECK);
3460
3461 operands->at_put(operand_fill_index++, bootstrap_method_index);
3462 operands->at_put(operand_fill_index++, argument_count);
3463
3464 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3465 for (int j = 0; j < argument_count; j++) {
3466 const u2 argument_index = cfs->get_u2_fast();
3467 check_property(
3468 valid_cp_range(argument_index, cp_size) &&
3469 cp->tag_at(argument_index).is_loadable_constant(),
3470 "argument_index %u has bad constant type in class file %s",
3471 argument_index,
3472 CHECK);
3473 operands->at_put(operand_fill_index++, argument_index);
3474 }
3475 }
3476 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3477 "Bad length on BootstrapMethods in class file %s",
3478 CHECK);
3479 }
3480
3481 bool ClassFileParser::supports_records() {
3482 return _major_version == JVM_CLASSFILE_MAJOR_VERSION &&
3483 _minor_version == JAVA_PREVIEW_MINOR_VERSION &&
3484 Arguments::enable_preview();
3485 }
3486
3487 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3488 ConstantPool* cp,
3489 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3490 TRAPS) {
3491 assert(cfs != NULL, "invariant");
3492 assert(cp != NULL, "invariant");
3493 assert(parsed_annotations != NULL, "invariant");
3494
3495 // Set inner classes attribute to default sentinel
3496 _inner_classes = Universe::the_empty_short_array();
3497 // Set nest members attribute to default sentinel
3498 _nest_members = Universe::the_empty_short_array();
3499 cfs->guarantee_more(2, CHECK); // attributes_count
3500 u2 attributes_count = cfs->get_u2_fast();
3501 bool parsed_sourcefile_attribute = false;
3502 bool parsed_innerclasses_attribute = false;
3503 bool parsed_nest_members_attribute = false;
3504 bool parsed_nest_host_attribute = false;
3505 bool parsed_record_attribute = false;
3506 bool parsed_enclosingmethod_attribute = false;
3507 bool parsed_bootstrap_methods_attribute = false;
3508 const u1* runtime_visible_annotations = NULL;
3509 int runtime_visible_annotations_length = 0;
3510 const u1* runtime_invisible_annotations = NULL;
3511 int runtime_invisible_annotations_length = 0;
3512 const u1* runtime_visible_type_annotations = NULL;
3513 int runtime_visible_type_annotations_length = 0;
3514 const u1* runtime_invisible_type_annotations = NULL;
3515 int runtime_invisible_type_annotations_length = 0;
3516 bool runtime_invisible_type_annotations_exists = false;
3517 bool runtime_invisible_annotations_exists = false;
3518 bool parsed_source_debug_ext_annotations_exist = false;
3519 const u1* inner_classes_attribute_start = NULL;
3520 u4 inner_classes_attribute_length = 0;
3521 u2 enclosing_method_class_index = 0;
3522 u2 enclosing_method_method_index = 0;
3523 const u1* nest_members_attribute_start = NULL;
3524 u4 nest_members_attribute_length = 0;
3525 const u1* record_attribute_start = NULL;
3526 u4 record_attribute_length = 0;
3527
3528 // Iterate over attributes
3529 while (attributes_count--) {
3530 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3531 const u2 attribute_name_index = cfs->get_u2_fast();
3532 const u4 attribute_length = cfs->get_u4_fast();
3533 check_property(
3534 valid_symbol_at(attribute_name_index),
3535 "Attribute name has bad constant pool index %u in class file %s",
3536 attribute_name_index, CHECK);
3537 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3538 if (tag == vmSymbols::tag_source_file()) {
3539 // Check for SourceFile tag
3540 if (_need_verify) {
3541 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3542 }
3543 if (parsed_sourcefile_attribute) {
3544 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3545 } else {
3546 parsed_sourcefile_attribute = true;
3547 }
3548 parse_classfile_sourcefile_attribute(cfs, CHECK);
3549 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3550 // Check for SourceDebugExtension tag
3551 if (parsed_source_debug_ext_annotations_exist) {
3552 classfile_parse_error(
3553 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3554 }
3555 parsed_source_debug_ext_annotations_exist = true;
3556 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3557 } else if (tag == vmSymbols::tag_inner_classes()) {
3558 // Check for InnerClasses tag
3559 if (parsed_innerclasses_attribute) {
3560 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3561 } else {
3562 parsed_innerclasses_attribute = true;
3563 }
3564 inner_classes_attribute_start = cfs->current();
3565 inner_classes_attribute_length = attribute_length;
3566 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3567 } else if (tag == vmSymbols::tag_synthetic()) {
3568 // Check for Synthetic tag
3569 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3570 if (attribute_length != 0) {
3571 classfile_parse_error(
3572 "Invalid Synthetic classfile attribute length %u in class file %s",
3573 attribute_length, CHECK);
3574 }
3575 parse_classfile_synthetic_attribute(CHECK);
3576 } else if (tag == vmSymbols::tag_deprecated()) {
3577 // Check for Deprecatd tag - 4276120
3578 if (attribute_length != 0) {
3579 classfile_parse_error(
3580 "Invalid Deprecated classfile attribute length %u in class file %s",
3581 attribute_length, CHECK);
3582 }
3583 } else if (_major_version >= JAVA_1_5_VERSION) {
3584 if (tag == vmSymbols::tag_signature()) {
3585 if (_generic_signature_index != 0) {
3586 classfile_parse_error(
3587 "Multiple Signature attributes in class file %s", CHECK);
3588 }
3589 if (attribute_length != 2) {
3590 classfile_parse_error(
3591 "Wrong Signature attribute length %u in class file %s",
3592 attribute_length, CHECK);
3593 }
3594 parse_classfile_signature_attribute(cfs, CHECK);
3595 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3596 if (runtime_visible_annotations != NULL) {
3597 classfile_parse_error(
3598 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3599 }
3600 runtime_visible_annotations_length = attribute_length;
3601 runtime_visible_annotations = cfs->current();
3602 assert(runtime_visible_annotations != NULL, "null visible annotations");
3603 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3604 parse_annotations(cp,
3605 runtime_visible_annotations,
3606 runtime_visible_annotations_length,
3607 parsed_annotations,
3608 _loader_data,
3609 CHECK);
3610 cfs->skip_u1_fast(runtime_visible_annotations_length);
3611 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3612 if (runtime_invisible_annotations_exists) {
3613 classfile_parse_error(
3614 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3615 }
3616 runtime_invisible_annotations_exists = true;
3617 if (PreserveAllAnnotations) {
3618 runtime_invisible_annotations_length = attribute_length;
3619 runtime_invisible_annotations = cfs->current();
3620 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3621 }
3622 cfs->skip_u1(attribute_length, CHECK);
3623 } else if (tag == vmSymbols::tag_enclosing_method()) {
3624 if (parsed_enclosingmethod_attribute) {
3625 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3626 } else {
3627 parsed_enclosingmethod_attribute = true;
3628 }
3629 guarantee_property(attribute_length == 4,
3630 "Wrong EnclosingMethod attribute length %u in class file %s",
3631 attribute_length, CHECK);
3632 cfs->guarantee_more(4, CHECK); // class_index, method_index
3633 enclosing_method_class_index = cfs->get_u2_fast();
3634 enclosing_method_method_index = cfs->get_u2_fast();
3635 if (enclosing_method_class_index == 0) {
3636 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3637 }
3638 // Validate the constant pool indices and types
3639 check_property(valid_klass_reference_at(enclosing_method_class_index),
3640 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3641 if (enclosing_method_method_index != 0 &&
3642 (!cp->is_within_bounds(enclosing_method_method_index) ||
3643 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3644 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3645 }
3646 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3647 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3648 if (parsed_bootstrap_methods_attribute) {
3649 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3650 }
3651 parsed_bootstrap_methods_attribute = true;
3652 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3653 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3654 if (runtime_visible_type_annotations != NULL) {
3655 classfile_parse_error(
3656 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3657 }
3658 runtime_visible_type_annotations_length = attribute_length;
3659 runtime_visible_type_annotations = cfs->current();
3660 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3661 // No need for the VM to parse Type annotations
3662 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3663 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3664 if (runtime_invisible_type_annotations_exists) {
3665 classfile_parse_error(
3666 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3667 } else {
3668 runtime_invisible_type_annotations_exists = true;
3669 }
3670 if (PreserveAllAnnotations) {
3671 runtime_invisible_type_annotations_length = attribute_length;
3672 runtime_invisible_type_annotations = cfs->current();
3673 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3674 }
3675 cfs->skip_u1(attribute_length, CHECK);
3676 } else if (_major_version >= JAVA_11_VERSION) {
3677 if (tag == vmSymbols::tag_nest_members()) {
3678 // Check for NestMembers tag
3679 if (parsed_nest_members_attribute) {
3680 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK);
3681 } else {
3682 parsed_nest_members_attribute = true;
3683 }
3684 if (parsed_nest_host_attribute) {
3685 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK);
3686 }
3687 nest_members_attribute_start = cfs->current();
3688 nest_members_attribute_length = attribute_length;
3689 cfs->skip_u1(nest_members_attribute_length, CHECK);
3690 } else if (tag == vmSymbols::tag_nest_host()) {
3691 if (parsed_nest_host_attribute) {
3692 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK);
3693 } else {
3694 parsed_nest_host_attribute = true;
3695 }
3696 if (parsed_nest_members_attribute) {
3697 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK);
3698 }
3699 if (_need_verify) {
3700 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3701 }
3702 cfs->guarantee_more(2, CHECK);
3703 u2 class_info_index = cfs->get_u2_fast();
3704 check_property(
3705 valid_klass_reference_at(class_info_index),
3706 "Nest-host class_info_index %u has bad constant type in class file %s",
3707 class_info_index, CHECK);
3708 _nest_host = class_info_index;
3709 } else if (_major_version >= JAVA_14_VERSION) {
3710 if (tag == vmSymbols::tag_record()) {
3711 // Skip over Record attribute if not supported or if super class is
3712 // not java.lang.Record.
3713 if (supports_records() &&
3714 cp->klass_name_at(_super_class_index) == vmSymbols::java_lang_Record()) {
3715 if (parsed_record_attribute) {
3716 classfile_parse_error("Multiple Record attributes in class file %s", CHECK);
3717 }
3718 // Check that class is final and not abstract.
3719 if (!_access_flags.is_final() || _access_flags.is_abstract()) {
3720 classfile_parse_error("Record attribute in non-final or abstract class file %s", CHECK);
3721 }
3722 parsed_record_attribute = true;
3723 record_attribute_start = cfs->current();
3724 record_attribute_length = attribute_length;
3725 } else if (log_is_enabled(Info, class, record)) {
3726 // Log why the Record attribute was ignored. Note that if the
3727 // class file version is JVM_CLASSFILE_MAJOR_VERSION.65535 and
3728 // --enable-preview wasn't specified then a java.lang.UnsupportedClassVersionError
3729 // exception would have been thrown.
3730 ResourceMark rm(THREAD);
3731 if (supports_records()) {
3732 log_info(class, record)(
3733 "Ignoring Record attribute in class %s because super type is not java.lang.Record",
3734 _class_name->as_C_string());
3735 } else {
3736 log_info(class, record)(
3737 "Ignoring Record attribute in class %s because class file version is not %d.65535",
3738 _class_name->as_C_string(), JVM_CLASSFILE_MAJOR_VERSION);
3739 }
3740 }
3741 cfs->skip_u1(attribute_length, CHECK);
3742 } else {
3743 // Unknown attribute
3744 cfs->skip_u1(attribute_length, CHECK);
3745 }
3746 } else {
3747 // Unknown attribute
3748 cfs->skip_u1(attribute_length, CHECK);
3749 }
3750 } else {
3751 // Unknown attribute
3752 cfs->skip_u1(attribute_length, CHECK);
3753 }
3754 } else {
3755 // Unknown attribute
3756 cfs->skip_u1(attribute_length, CHECK);
3757 }
3758 }
3759 _class_annotations = assemble_annotations(runtime_visible_annotations,
3760 runtime_visible_annotations_length,
3761 runtime_invisible_annotations,
3762 runtime_invisible_annotations_length,
3763 CHECK);
3764 _class_type_annotations = assemble_annotations(runtime_visible_type_annotations,
3765 runtime_visible_type_annotations_length,
3766 runtime_invisible_type_annotations,
3767 runtime_invisible_type_annotations_length,
3768 CHECK);
3769
3770 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3771 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3772 cfs,
3773 inner_classes_attribute_start,
3774 parsed_innerclasses_attribute,
3775 enclosing_method_class_index,
3776 enclosing_method_method_index,
3777 CHECK);
3778 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3779 guarantee_property(
3780 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3781 "Wrong InnerClasses attribute length in class file %s", CHECK);
3782 }
3783 }
3784
3785 if (parsed_nest_members_attribute) {
3786 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3787 cfs,
3788 nest_members_attribute_start,
3789 CHECK);
3790 if (_need_verify) {
3791 guarantee_property(
3792 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3793 "Wrong NestMembers attribute length in class file %s", CHECK);
3794 }
3795 }
3796
3797 if (parsed_record_attribute) {
3798 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3799 cfs,
3800 cp,
3801 record_attribute_start,
3802 CHECK);
3803 if (_need_verify) {
3804 guarantee_property(record_attribute_length == calculated_attr_length,
3805 "Record attribute has wrong length in class file %s",
3806 CHECK);
3807 }
3808 }
3809
3810 if (_max_bootstrap_specifier_index >= 0) {
3811 guarantee_property(parsed_bootstrap_methods_attribute,
3812 "Missing BootstrapMethods attribute in class file %s", CHECK);
3813 }
3814 }
3815
3816 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3817 assert(k != NULL, "invariant");
3818
3819 if (_synthetic_flag)
3820 k->set_is_synthetic();
3821 if (_sourcefile_index != 0) {
3822 k->set_source_file_name_index(_sourcefile_index);
3823 }
3824 if (_generic_signature_index != 0) {
3825 k->set_generic_signature_index(_generic_signature_index);
3826 }
3827 if (_sde_buffer != NULL) {
3828 k->set_source_debug_extension(_sde_buffer, _sde_length);
3829 }
3830 }
3831
3832 // Create the Annotations object that will
3833 // hold the annotations array for the Klass.
3834 void ClassFileParser::create_combined_annotations(TRAPS) {
3835 if (_class_annotations == NULL &&
3836 _class_type_annotations == NULL &&
3837 _fields_annotations == NULL &&
3838 _fields_type_annotations == NULL) {
3839 // Don't create the Annotations object unnecessarily.
3840 return;
3841 }
3842
3843 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3844 annotations->set_class_annotations(_class_annotations);
3845 annotations->set_class_type_annotations(_class_type_annotations);
3846 annotations->set_fields_annotations(_fields_annotations);
3847 annotations->set_fields_type_annotations(_fields_type_annotations);
3848
3849 // This is the Annotations object that will be
3850 // assigned to InstanceKlass being constructed.
3851 _combined_annotations = annotations;
3852
3853 // The annotations arrays below has been transfered the
3854 // _combined_annotations so these fields can now be cleared.
3855 _class_annotations = NULL;
3856 _class_type_annotations = NULL;
3857 _fields_annotations = NULL;
3858 _fields_type_annotations = NULL;
3859 }
3860
3861 // Transfer ownership of metadata allocated to the InstanceKlass.
3862 void ClassFileParser::apply_parsed_class_metadata(
3863 InstanceKlass* this_klass,
3864 int java_fields_count,
3865 TRAPS) {
3866 assert(this_klass != NULL, "invariant");
3867
3868 _cp->set_pool_holder(this_klass);
3869 this_klass->set_constants(_cp);
3870 this_klass->set_fields(_fields, java_fields_count);
3871 this_klass->set_methods(_methods);
3872 this_klass->set_inner_classes(_inner_classes);
3873 this_klass->set_nest_members(_nest_members);
3874 this_klass->set_nest_host_index(_nest_host);
3875 this_klass->set_local_interfaces(_local_interfaces);
3876 this_klass->set_annotations(_combined_annotations);
3877 this_klass->set_record_components(_record_components);
3878 // Delay the setting of _transitive_interfaces until after initialize_supers() in
3879 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with
3880 // its _super. If an OOM occurs while loading the current klass, its _super field
3881 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3882 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3883 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3884
3885 // Clear out these fields so they don't get deallocated by the destructor
3886 clear_class_metadata();
3887 }
3888
3889 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3890 int runtime_visible_annotations_length,
3891 const u1* const runtime_invisible_annotations,
3892 int runtime_invisible_annotations_length,
3893 TRAPS) {
3894 AnnotationArray* annotations = NULL;
3895 if (runtime_visible_annotations != NULL ||
3896 runtime_invisible_annotations != NULL) {
3897 annotations = MetadataFactory::new_array<u1>(_loader_data,
3898 runtime_visible_annotations_length +
3899 runtime_invisible_annotations_length,
3900 CHECK_(annotations));
3901 if (runtime_visible_annotations != NULL) {
3902 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3903 annotations->at_put(i, runtime_visible_annotations[i]);
3904 }
3905 }
3906 if (runtime_invisible_annotations != NULL) {
3907 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3908 int append = runtime_visible_annotations_length+i;
3909 annotations->at_put(append, runtime_invisible_annotations[i]);
3910 }
3911 }
3912 }
3913 return annotations;
3914 }
3915
3916 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3917 const int super_class_index,
3918 const bool need_verify,
3919 TRAPS) {
3920 assert(cp != NULL, "invariant");
3921 const InstanceKlass* super_klass = NULL;
3922
3923 if (super_class_index == 0) {
3924 check_property(_class_name == vmSymbols::java_lang_Object(),
3925 "Invalid superclass index %u in class file %s",
3926 super_class_index,
3927 CHECK_NULL);
3928 } else {
3929 check_property(valid_klass_reference_at(super_class_index),
3930 "Invalid superclass index %u in class file %s",
3931 super_class_index,
3932 CHECK_NULL);
3933 // The class name should be legal because it is checked when parsing constant pool.
3934 // However, make sure it is not an array type.
3935 bool is_array = false;
3936 if (cp->tag_at(super_class_index).is_klass()) {
3937 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3938 if (need_verify)
3939 is_array = super_klass->is_array_klass();
3940 } else if (need_verify) {
3941 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3942 }
3943 if (need_verify) {
3944 guarantee_property(!is_array,
3945 "Bad superclass name in class file %s", CHECK_NULL);
3946 }
3947 }
3948 return super_klass;
3949 }
3950
3951 static unsigned int compute_oop_map_count(const InstanceKlass* super,
3952 unsigned int nonstatic_oop_map_count,
3953 int first_nonstatic_oop_offset) {
3954
3955 unsigned int map_count =
3956 NULL == super ? 0 : super->nonstatic_oop_map_count();
3957 if (nonstatic_oop_map_count > 0) {
3958 // We have oops to add to map
3959 if (map_count == 0) {
3960 map_count = nonstatic_oop_map_count;
3961 }
3962 else {
3963 // Check whether we should add a new map block or whether the last one can
3964 // be extended
3965 const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3966 const OopMapBlock* const last_map = first_map + map_count - 1;
3967
3968 const int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3969 if (next_offset == first_nonstatic_oop_offset) {
3970 // There is no gap bettwen superklass's last oop field and first
3971 // local oop field, merge maps.
3972 nonstatic_oop_map_count -= 1;
3973 }
3974 else {
3975 // Superklass didn't end with a oop field, add extra maps
3976 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3977 }
3978 map_count += nonstatic_oop_map_count;
3979 }
3980 }
3981 return map_count;
3982 }
3983
3984 #ifndef PRODUCT
3985 static void print_field_layout(const Symbol* name,
3986 Array<u2>* fields,
3987 ConstantPool* cp,
3988 int instance_size,
3989 int instance_fields_start,
3990 int instance_fields_end,
3991 int static_fields_end) {
3992
3993 assert(name != NULL, "invariant");
3994
3995 tty->print("%s: field layout\n", name->as_klass_external_name());
3996 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3997 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3998 if (!fs.access_flags().is_static()) {
3999 tty->print(" @%3d \"%s\" %s\n",
4000 fs.offset(),
4001 fs.name()->as_klass_external_name(),
4002 fs.signature()->as_klass_external_name());
4003 }
4004 }
4005 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4006 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4007 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4008 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4009 if (fs.access_flags().is_static()) {
4010 tty->print(" @%3d \"%s\" %s\n",
4011 fs.offset(),
4012 fs.name()->as_klass_external_name(),
4013 fs.signature()->as_klass_external_name());
4014 }
4015 }
4016 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4017 tty->print("\n");
4018 }
4019 #endif
4020
4021 // Values needed for oopmap and InstanceKlass creation
4022 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
4023 public:
4024 int* nonstatic_oop_offsets;
4025 unsigned int* nonstatic_oop_counts;
4026 unsigned int nonstatic_oop_map_count;
4027 unsigned int total_oop_map_count;
4028 int instance_size;
4029 int nonstatic_field_size;
4030 int static_field_size;
4031 bool has_nonstatic_fields;
4032 };
4033
4034 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
4035 void ClassFileParser::layout_fields(ConstantPool* cp,
4036 const FieldAllocationCount* fac,
4037 const ClassAnnotationCollector* parsed_annotations,
4038 FieldLayoutInfo* info,
4039 TRAPS) {
4040
4041 assert(cp != NULL, "invariant");
4042
4043 // Field size and offset computation
4044 int nonstatic_field_size = _super_klass == NULL ? 0 :
4045 _super_klass->nonstatic_field_size();
4046
4047 // Count the contended fields by type.
4048 //
4049 // We ignore static fields, because @Contended is not supported for them.
4050 // The layout code below will also ignore the static fields.
4051 int nonstatic_contended_count = 0;
4052 FieldAllocationCount fac_contended;
4053 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4054 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4055 if (fs.is_contended()) {
4056 fac_contended.count[atype]++;
4057 if (!fs.access_flags().is_static()) {
4058 nonstatic_contended_count++;
4059 }
4060 }
4061 }
4062
4063
4064 // Calculate the starting byte offsets
4065 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
4066 int next_static_double_offset = next_static_oop_offset +
4067 ((fac->count[STATIC_OOP]) * heapOopSize);
4068 if (fac->count[STATIC_DOUBLE]) {
4069 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
4070 }
4071
4072 int next_static_word_offset = next_static_double_offset +
4073 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
4074 int next_static_short_offset = next_static_word_offset +
4075 ((fac->count[STATIC_WORD]) * BytesPerInt);
4076 int next_static_byte_offset = next_static_short_offset +
4077 ((fac->count[STATIC_SHORT]) * BytesPerShort);
4078
4079 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
4080 nonstatic_field_size * heapOopSize;
4081
4082 int next_nonstatic_field_offset = nonstatic_fields_start;
4083
4084 const bool is_contended_class = parsed_annotations->is_contended();
4085
4086 // Class is contended, pad before all the fields
4087 if (is_contended_class) {
4088 next_nonstatic_field_offset += ContendedPaddingWidth;
4089 }
4090
4091 // Compute the non-contended fields count.
4092 // The packing code below relies on these counts to determine if some field
4093 // can be squeezed into the alignment gap. Contended fields are obviously
4094 // exempt from that.
4095 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
4096 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
4097 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
4098 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
4099 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
4100
4101 // Total non-static fields count, including every contended field
4102 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
4103 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
4104 fac->count[NONSTATIC_OOP];
4105
4106 const bool super_has_nonstatic_fields =
4107 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
4108 const bool has_nonstatic_fields =
4109 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
4110
4111
4112 // Prepare list of oops for oop map generation.
4113 //
4114 // "offset" and "count" lists are describing the set of contiguous oop
4115 // regions. offset[i] is the start of the i-th region, which then has
4116 // count[i] oops following. Before we know how many regions are required,
4117 // we pessimistically allocate the maps to fit all the oops into the
4118 // distinct regions.
4119 //
4120 // TODO: We add +1 to always allocate non-zero resource arrays; we need
4121 // to figure out if we still need to do this.
4122 unsigned int nonstatic_oop_map_count = 0;
4123 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
4124
4125 int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
4126 THREAD, int, max_nonstatic_oop_maps);
4127 unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
4128 THREAD, unsigned int, max_nonstatic_oop_maps);
4129
4130 int first_nonstatic_oop_offset = 0; // will be set for first oop field
4131
4132 bool compact_fields = CompactFields;
4133 int allocation_style = FieldsAllocationStyle;
4134 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
4135 assert(false, "0 <= FieldsAllocationStyle <= 2");
4136 allocation_style = 1; // Optimistic
4137 }
4138
4139 // The next classes have predefined hard-coded fields offsets
4140 // (see in JavaClasses::compute_hard_coded_offsets()).
4141 // Use default fields allocation order for them.
4142 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
4143 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
4144 _class_name == vmSymbols::java_lang_Class() ||
4145 _class_name == vmSymbols::java_lang_ClassLoader() ||
4146 _class_name == vmSymbols::java_lang_ref_Reference() ||
4147 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
4148 _class_name == vmSymbols::java_lang_StackTraceElement() ||
4149 _class_name == vmSymbols::java_lang_String() ||
4150 _class_name == vmSymbols::java_lang_Throwable() ||
4151 _class_name == vmSymbols::java_lang_Boolean() ||
4152 _class_name == vmSymbols::java_lang_Character() ||
4153 _class_name == vmSymbols::java_lang_Float() ||
4154 _class_name == vmSymbols::java_lang_Double() ||
4155 _class_name == vmSymbols::java_lang_Byte() ||
4156 _class_name == vmSymbols::java_lang_Short() ||
4157 _class_name == vmSymbols::java_lang_Integer() ||
4158 _class_name == vmSymbols::java_lang_Long())) {
4159 allocation_style = 0; // Allocate oops first
4160 compact_fields = false; // Don't compact fields
4161 }
4162
4163 int next_nonstatic_oop_offset = 0;
4164 int next_nonstatic_double_offset = 0;
4165
4166 // Rearrange fields for a given allocation style
4167 if( allocation_style == 0 ) {
4168 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
4169 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4170 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4171 (nonstatic_oop_count * heapOopSize);
4172 } else if( allocation_style == 1 ) {
4173 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
4174 next_nonstatic_double_offset = next_nonstatic_field_offset;
4175 } else if( allocation_style == 2 ) {
4176 // Fields allocation: oops fields in super and sub classes are together.
4177 if( nonstatic_field_size > 0 && _super_klass != NULL &&
4178 _super_klass->nonstatic_oop_map_size() > 0 ) {
4179 const unsigned int map_count = _super_klass->nonstatic_oop_map_count();
4180 const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps();
4181 const OopMapBlock* const last_map = first_map + map_count - 1;
4182 const int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
4183 if (next_offset == next_nonstatic_field_offset) {
4184 allocation_style = 0; // allocate oops first
4185 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4186 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4187 (nonstatic_oop_count * heapOopSize);
4188 }
4189 }
4190 if( allocation_style == 2 ) {
4191 allocation_style = 1; // allocate oops last
4192 next_nonstatic_double_offset = next_nonstatic_field_offset;
4193 }
4194 } else {
4195 ShouldNotReachHere();
4196 }
4197
4198 int nonstatic_oop_space_count = 0;
4199 int nonstatic_word_space_count = 0;
4200 int nonstatic_short_space_count = 0;
4201 int nonstatic_byte_space_count = 0;
4202 int nonstatic_oop_space_offset = 0;
4203 int nonstatic_word_space_offset = 0;
4204 int nonstatic_short_space_offset = 0;
4205 int nonstatic_byte_space_offset = 0;
4206
4207 // Try to squeeze some of the fields into the gaps due to
4208 // long/double alignment.
4209 if (nonstatic_double_count > 0) {
4210 int offset = next_nonstatic_double_offset;
4211 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
4212 if (compact_fields && offset != next_nonstatic_double_offset) {
4213 // Allocate available fields into the gap before double field.
4214 int length = next_nonstatic_double_offset - offset;
4215 assert(length == BytesPerInt, "");
4216 nonstatic_word_space_offset = offset;
4217 if (nonstatic_word_count > 0) {
4218 nonstatic_word_count -= 1;
4219 nonstatic_word_space_count = 1; // Only one will fit
4220 length -= BytesPerInt;
4221 offset += BytesPerInt;
4222 }
4223 nonstatic_short_space_offset = offset;
4224 while (length >= BytesPerShort && nonstatic_short_count > 0) {
4225 nonstatic_short_count -= 1;
4226 nonstatic_short_space_count += 1;
4227 length -= BytesPerShort;
4228 offset += BytesPerShort;
4229 }
4230 nonstatic_byte_space_offset = offset;
4231 while (length > 0 && nonstatic_byte_count > 0) {
4232 nonstatic_byte_count -= 1;
4233 nonstatic_byte_space_count += 1;
4234 length -= 1;
4235 }
4236 // Allocate oop field in the gap if there are no other fields for that.
4237 nonstatic_oop_space_offset = offset;
4238 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
4239 allocation_style != 0) { // when oop fields not first
4240 nonstatic_oop_count -= 1;
4241 nonstatic_oop_space_count = 1; // Only one will fit
4242 length -= heapOopSize;
4243 offset += heapOopSize;
4244 }
4245 }
4246 }
4247
4248 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4249 (nonstatic_double_count * BytesPerLong);
4250 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4251 (nonstatic_word_count * BytesPerInt);
4252 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4253 (nonstatic_short_count * BytesPerShort);
4254 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4255 nonstatic_byte_count;
4256
4257 // let oops jump before padding with this allocation style
4258 if( allocation_style == 1 ) {
4259 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4260 if( nonstatic_oop_count > 0 ) {
4261 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4262 }
4263 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4264 }
4265
4266 // Iterate over fields again and compute correct offsets.
4267 // The field allocation type was temporarily stored in the offset slot.
4268 // oop fields are located before non-oop fields (static and non-static).
4269 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4270
4271 // skip already laid out fields
4272 if (fs.is_offset_set()) continue;
4273
4274 // contended instance fields are handled below
4275 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4276
4277 int real_offset = 0;
4278 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4279
4280 // pack the rest of the fields
4281 switch (atype) {
4282 case STATIC_OOP:
4283 real_offset = next_static_oop_offset;
4284 next_static_oop_offset += heapOopSize;
4285 break;
4286 case STATIC_BYTE:
4287 real_offset = next_static_byte_offset;
4288 next_static_byte_offset += 1;
4289 break;
4290 case STATIC_SHORT:
4291 real_offset = next_static_short_offset;
4292 next_static_short_offset += BytesPerShort;
4293 break;
4294 case STATIC_WORD:
4295 real_offset = next_static_word_offset;
4296 next_static_word_offset += BytesPerInt;
4297 break;
4298 case STATIC_DOUBLE:
4299 real_offset = next_static_double_offset;
4300 next_static_double_offset += BytesPerLong;
4301 break;
4302 case NONSTATIC_OOP:
4303 if( nonstatic_oop_space_count > 0 ) {
4304 real_offset = nonstatic_oop_space_offset;
4305 nonstatic_oop_space_offset += heapOopSize;
4306 nonstatic_oop_space_count -= 1;
4307 } else {
4308 real_offset = next_nonstatic_oop_offset;
4309 next_nonstatic_oop_offset += heapOopSize;
4310 }
4311
4312 // Record this oop in the oop maps
4313 if( nonstatic_oop_map_count > 0 &&
4314 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4315 real_offset -
4316 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4317 heapOopSize ) {
4318 // This oop is adjacent to the previous one, add to current oop map
4319 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4320 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4321 } else {
4322 // This oop is not adjacent to the previous one, create new oop map
4323 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4324 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4325 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4326 nonstatic_oop_map_count += 1;
4327 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4328 first_nonstatic_oop_offset = real_offset;
4329 }
4330 }
4331 break;
4332 case NONSTATIC_BYTE:
4333 if( nonstatic_byte_space_count > 0 ) {
4334 real_offset = nonstatic_byte_space_offset;
4335 nonstatic_byte_space_offset += 1;
4336 nonstatic_byte_space_count -= 1;
4337 } else {
4338 real_offset = next_nonstatic_byte_offset;
4339 next_nonstatic_byte_offset += 1;
4340 }
4341 break;
4342 case NONSTATIC_SHORT:
4343 if( nonstatic_short_space_count > 0 ) {
4344 real_offset = nonstatic_short_space_offset;
4345 nonstatic_short_space_offset += BytesPerShort;
4346 nonstatic_short_space_count -= 1;
4347 } else {
4348 real_offset = next_nonstatic_short_offset;
4349 next_nonstatic_short_offset += BytesPerShort;
4350 }
4351 break;
4352 case NONSTATIC_WORD:
4353 if( nonstatic_word_space_count > 0 ) {
4354 real_offset = nonstatic_word_space_offset;
4355 nonstatic_word_space_offset += BytesPerInt;
4356 nonstatic_word_space_count -= 1;
4357 } else {
4358 real_offset = next_nonstatic_word_offset;
4359 next_nonstatic_word_offset += BytesPerInt;
4360 }
4361 break;
4362 case NONSTATIC_DOUBLE:
4363 real_offset = next_nonstatic_double_offset;
4364 next_nonstatic_double_offset += BytesPerLong;
4365 break;
4366 default:
4367 ShouldNotReachHere();
4368 }
4369 fs.set_offset(real_offset);
4370 }
4371
4372
4373 // Handle the contended cases.
4374 //
4375 // Each contended field should not intersect the cache line with another contended field.
4376 // In the absence of alignment information, we end up with pessimistically separating
4377 // the fields with full-width padding.
4378 //
4379 // Additionally, this should not break alignment for the fields, so we round the alignment up
4380 // for each field.
4381 if (nonstatic_contended_count > 0) {
4382
4383 // if there is at least one contended field, we need to have pre-padding for them
4384 next_nonstatic_padded_offset += ContendedPaddingWidth;
4385
4386 // collect all contended groups
4387 ResourceBitMap bm(cp->size());
4388 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4389 // skip already laid out fields
4390 if (fs.is_offset_set()) continue;
4391
4392 if (fs.is_contended()) {
4393 bm.set_bit(fs.contended_group());
4394 }
4395 }
4396
4397 int current_group = -1;
4398 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4399
4400 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4401
4402 // skip already laid out fields
4403 if (fs.is_offset_set()) continue;
4404
4405 // skip non-contended fields and fields from different group
4406 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4407
4408 // handle statics below
4409 if (fs.access_flags().is_static()) continue;
4410
4411 int real_offset = 0;
4412 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4413
4414 switch (atype) {
4415 case NONSTATIC_BYTE:
4416 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4417 real_offset = next_nonstatic_padded_offset;
4418 next_nonstatic_padded_offset += 1;
4419 break;
4420
4421 case NONSTATIC_SHORT:
4422 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4423 real_offset = next_nonstatic_padded_offset;
4424 next_nonstatic_padded_offset += BytesPerShort;
4425 break;
4426
4427 case NONSTATIC_WORD:
4428 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4429 real_offset = next_nonstatic_padded_offset;
4430 next_nonstatic_padded_offset += BytesPerInt;
4431 break;
4432
4433 case NONSTATIC_DOUBLE:
4434 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4435 real_offset = next_nonstatic_padded_offset;
4436 next_nonstatic_padded_offset += BytesPerLong;
4437 break;
4438
4439 case NONSTATIC_OOP:
4440 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4441 real_offset = next_nonstatic_padded_offset;
4442 next_nonstatic_padded_offset += heapOopSize;
4443
4444 // Record this oop in the oop maps
4445 if( nonstatic_oop_map_count > 0 &&
4446 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4447 real_offset -
4448 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4449 heapOopSize ) {
4450 // This oop is adjacent to the previous one, add to current oop map
4451 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4452 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4453 } else {
4454 // This oop is not adjacent to the previous one, create new oop map
4455 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4456 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4457 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4458 nonstatic_oop_map_count += 1;
4459 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4460 first_nonstatic_oop_offset = real_offset;
4461 }
4462 }
4463 break;
4464
4465 default:
4466 ShouldNotReachHere();
4467 }
4468
4469 if (fs.contended_group() == 0) {
4470 // Contended group defines the equivalence class over the fields:
4471 // the fields within the same contended group are not inter-padded.
4472 // The only exception is default group, which does not incur the
4473 // equivalence, and so requires intra-padding.
4474 next_nonstatic_padded_offset += ContendedPaddingWidth;
4475 }
4476
4477 fs.set_offset(real_offset);
4478 } // for
4479
4480 // Start laying out the next group.
4481 // Note that this will effectively pad the last group in the back;
4482 // this is expected to alleviate memory contention effects for
4483 // subclass fields and/or adjacent object.
4484 // If this was the default group, the padding is already in place.
4485 if (current_group != 0) {
4486 next_nonstatic_padded_offset += ContendedPaddingWidth;
4487 }
4488 }
4489
4490 // handle static fields
4491 }
4492
4493 // Entire class is contended, pad in the back.
4494 // This helps to alleviate memory contention effects for subclass fields
4495 // and/or adjacent object.
4496 if (is_contended_class) {
4497 next_nonstatic_padded_offset += ContendedPaddingWidth;
4498 }
4499
4500 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4501
4502 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize);
4503 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4504 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4505
4506 int static_field_size = (static_fields_end -
4507 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4508 nonstatic_field_size = nonstatic_field_size +
4509 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4510
4511 int instance_size = align_object_size(instance_end / wordSize);
4512
4513 assert(instance_size == align_object_size(align_up(
4514 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
4515 wordSize) / wordSize), "consistent layout helper value");
4516
4517 // Invariant: nonstatic_field end/start should only change if there are
4518 // nonstatic fields in the class, or if the class is contended. We compare
4519 // against the non-aligned value, so that end alignment will not fail the
4520 // assert without actually having the fields.
4521 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4522 is_contended_class ||
4523 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4524
4525 // Number of non-static oop map blocks allocated at end of klass.
4526 const unsigned int total_oop_map_count =
4527 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
4528 first_nonstatic_oop_offset);
4529
4530 #ifndef PRODUCT
4531 if (PrintFieldLayout) {
4532 print_field_layout(_class_name,
4533 _fields,
4534 cp,
4535 instance_size,
4536 nonstatic_fields_start,
4537 nonstatic_fields_end,
4538 static_fields_end);
4539 }
4540
4541 #endif
4542 // Pass back information needed for InstanceKlass creation
4543 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
4544 info->nonstatic_oop_counts = nonstatic_oop_counts;
4545 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
4546 info->total_oop_map_count = total_oop_map_count;
4547 info->instance_size = instance_size;
4548 info->static_field_size = static_field_size;
4549 info->nonstatic_field_size = nonstatic_field_size;
4550 info->has_nonstatic_fields = has_nonstatic_fields;
4551 }
4552
4553 static void fill_oop_maps(const InstanceKlass* k,
4554 unsigned int nonstatic_oop_map_count,
4555 const int* nonstatic_oop_offsets,
4556 const unsigned int* nonstatic_oop_counts) {
4557
4558 assert(k != NULL, "invariant");
4559
4560 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4561 const InstanceKlass* const super = k->superklass();
4562 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4563 if (super_count > 0) {
4564 // Copy maps from superklass
4565 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4566 for (unsigned int i = 0; i < super_count; ++i) {
4567 *this_oop_map++ = *super_oop_map++;
4568 }
4569 }
4570
4571 if (nonstatic_oop_map_count > 0) {
4572 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4573 // The counts differ because there is no gap between superklass's last oop
4574 // field and the first local oop field. Extend the last oop map copied
4575 // from the superklass instead of creating new one.
4576 nonstatic_oop_map_count--;
4577 nonstatic_oop_offsets++;
4578 this_oop_map--;
4579 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4580 this_oop_map++;
4581 }
4582
4583 // Add new map blocks, fill them
4584 while (nonstatic_oop_map_count-- > 0) {
4585 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4586 this_oop_map->set_count(*nonstatic_oop_counts++);
4587 this_oop_map++;
4588 }
4589 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4590 this_oop_map, "sanity");
4591 }
4592 }
4593
4594
4595 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4596 assert(ik != NULL, "invariant");
4597
4598 const Klass* const super = ik->super();
4599
4600 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4601 // in which case we don't have to register objects as finalizable
4602 if (!_has_empty_finalizer) {
4603 if (_has_finalizer ||
4604 (super != NULL && super->has_finalizer())) {
4605 ik->set_has_finalizer();
4606 }
4607 }
4608
4609 #ifdef ASSERT
4610 bool f = false;
4611 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4612 vmSymbols::void_method_signature());
4613 if (m != NULL && !m->is_empty_method()) {
4614 f = true;
4615 }
4616
4617 // Spec doesn't prevent agent from redefinition of empty finalizer.
4618 // Despite the fact that it's generally bad idea and redefined finalizer
4619 // will not work as expected we shouldn't abort vm in this case
4620 if (!ik->has_redefined_this_or_super()) {
4621 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4622 }
4623 #endif
4624
4625 // Check if this klass supports the java.lang.Cloneable interface
4626 if (SystemDictionary::Cloneable_klass_loaded()) {
4627 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4628 ik->set_is_cloneable();
4629 }
4630 }
4631
4632 // Check if this klass has a vanilla default constructor
4633 if (super == NULL) {
4634 // java.lang.Object has empty default constructor
4635 ik->set_has_vanilla_constructor();
4636 } else {
4637 if (super->has_vanilla_constructor() &&
4638 _has_vanilla_constructor) {
4639 ik->set_has_vanilla_constructor();
4640 }
4641 #ifdef ASSERT
4642 bool v = false;
4643 if (super->has_vanilla_constructor()) {
4644 const Method* const constructor =
4645 ik->find_method(vmSymbols::object_initializer_name(),
4646 vmSymbols::void_method_signature());
4647 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4648 v = true;
4649 }
4650 }
4651 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4652 #endif
4653 }
4654
4655 // If it cannot be fast-path allocated, set a bit in the layout helper.
4656 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4657 assert(ik->size_helper() > 0, "layout_helper is initialized");
4658 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4659 || ik->is_abstract() || ik->is_interface()
4660 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4661 || ik->size_helper() >= FastAllocateSizeLimit) {
4662 // Forbid fast-path allocation.
4663 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4664 ik->set_layout_helper(lh);
4665 }
4666 }
4667
4668 // utility methods for appending an array with check for duplicates
4669
4670 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4671 const Array<InstanceKlass*>* const ifs) {
4672 // iterate over new interfaces
4673 for (int i = 0; i < ifs->length(); i++) {
4674 InstanceKlass* const e = ifs->at(i);
4675 assert(e->is_klass() && e->is_interface(), "just checking");
4676 // add new interface
4677 result->append_if_missing(e);
4678 }
4679 }
4680
4681 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4682 Array<InstanceKlass*>* local_ifs,
4683 ClassLoaderData* loader_data,
4684 TRAPS) {
4685 assert(local_ifs != NULL, "invariant");
4686 assert(loader_data != NULL, "invariant");
4687
4688 // Compute maximum size for transitive interfaces
4689 int max_transitive_size = 0;
4690 int super_size = 0;
4691 // Add superclass transitive interfaces size
4692 if (super != NULL) {
4693 super_size = super->transitive_interfaces()->length();
4694 max_transitive_size += super_size;
4695 }
4696 // Add local interfaces' super interfaces
4697 const int local_size = local_ifs->length();
4698 for (int i = 0; i < local_size; i++) {
4699 InstanceKlass* const l = local_ifs->at(i);
4700 max_transitive_size += l->transitive_interfaces()->length();
4701 }
4702 // Finally add local interfaces
4703 max_transitive_size += local_size;
4704 // Construct array
4705 if (max_transitive_size == 0) {
4706 // no interfaces, use canonicalized array
4707 return Universe::the_empty_instance_klass_array();
4708 } else if (max_transitive_size == super_size) {
4709 // no new local interfaces added, share superklass' transitive interface array
4710 return super->transitive_interfaces();
4711 } else if (max_transitive_size == local_size) {
4712 // only local interfaces added, share local interface array
4713 return local_ifs;
4714 } else {
4715 ResourceMark rm;
4716 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4717
4718 // Copy down from superclass
4719 if (super != NULL) {
4720 append_interfaces(result, super->transitive_interfaces());
4721 }
4722
4723 // Copy down from local interfaces' superinterfaces
4724 for (int i = 0; i < local_size; i++) {
4725 InstanceKlass* const l = local_ifs->at(i);
4726 append_interfaces(result, l->transitive_interfaces());
4727 }
4728 // Finally add local interfaces
4729 append_interfaces(result, local_ifs);
4730
4731 // length will be less than the max_transitive_size if duplicates were removed
4732 const int length = result->length();
4733 assert(length <= max_transitive_size, "just checking");
4734 Array<InstanceKlass*>* const new_result =
4735 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4736 for (int i = 0; i < length; i++) {
4737 InstanceKlass* const e = result->at(i);
4738 assert(e != NULL, "just checking");
4739 new_result->at_put(i, e);
4740 }
4741 return new_result;
4742 }
4743 }
4744
4745 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4746 assert(this_klass != NULL, "invariant");
4747 const Klass* const super = this_klass->super();
4748
4749 if (super != NULL) {
4750
4751 // If the loader is not the boot loader then throw an exception if its
4752 // superclass is in package jdk.internal.reflect and its loader is not a
4753 // special reflection class loader
4754 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4755 assert(super->is_instance_klass(), "super is not instance klass");
4756 PackageEntry* super_package = super->package();
4757 if (super_package != NULL &&
4758 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4759 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4760 ResourceMark rm(THREAD);
4761 Exceptions::fthrow(
4762 THREAD_AND_LOCATION,
4763 vmSymbols::java_lang_IllegalAccessError(),
4764 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4765 this_klass->external_name(),
4766 this_klass->class_loader_data()->loader_name_and_id(),
4767 super->external_name());
4768 return;
4769 }
4770 }
4771
4772 Reflection::VerifyClassAccessResults vca_result =
4773 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4774 if (vca_result != Reflection::ACCESS_OK) {
4775 ResourceMark rm(THREAD);
4776 char* msg = Reflection::verify_class_access_msg(this_klass,
4777 InstanceKlass::cast(super),
4778 vca_result);
4779 if (msg == NULL) {
4780 bool same_module = (this_klass->module() == super->module());
4781 Exceptions::fthrow(
4782 THREAD_AND_LOCATION,
4783 vmSymbols::java_lang_IllegalAccessError(),
4784 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4785 this_klass->external_name(),
4786 super->is_abstract() ? "abstract " : "",
4787 super->external_name(),
4788 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4789 (same_module) ? "" : "; ",
4790 (same_module) ? "" : super->class_in_module_of_loader());
4791 } else {
4792 // Add additional message content.
4793 Exceptions::fthrow(
4794 THREAD_AND_LOCATION,
4795 vmSymbols::java_lang_IllegalAccessError(),
4796 "superclass access check failed: %s",
4797 msg);
4798 }
4799 }
4800 }
4801 }
4802
4803
4804 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4805 assert(this_klass != NULL, "invariant");
4806 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4807 const int lng = local_interfaces->length();
4808 for (int i = lng - 1; i >= 0; i--) {
4809 InstanceKlass* const k = local_interfaces->at(i);
4810 assert (k != NULL && k->is_interface(), "invalid interface");
4811 Reflection::VerifyClassAccessResults vca_result =
4812 Reflection::verify_class_access(this_klass, k, false);
4813 if (vca_result != Reflection::ACCESS_OK) {
4814 ResourceMark rm(THREAD);
4815 char* msg = Reflection::verify_class_access_msg(this_klass,
4816 k,
4817 vca_result);
4818 if (msg == NULL) {
4819 bool same_module = (this_klass->module() == k->module());
4820 Exceptions::fthrow(
4821 THREAD_AND_LOCATION,
4822 vmSymbols::java_lang_IllegalAccessError(),
4823 "class %s cannot access its superinterface %s (%s%s%s)",
4824 this_klass->external_name(),
4825 k->external_name(),
4826 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4827 (same_module) ? "" : "; ",
4828 (same_module) ? "" : k->class_in_module_of_loader());
4829 } else {
4830 // Add additional message content.
4831 Exceptions::fthrow(
4832 THREAD_AND_LOCATION,
4833 vmSymbols::java_lang_IllegalAccessError(),
4834 "superinterface check failed: %s",
4835 msg);
4836 }
4837 }
4838 }
4839 }
4840
4841
4842 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4843 assert(this_klass != NULL, "invariant");
4844 const Array<Method*>* const methods = this_klass->methods();
4845 const int num_methods = methods->length();
4846
4847 // go thru each method and check if it overrides a final method
4848 for (int index = 0; index < num_methods; index++) {
4849 const Method* const m = methods->at(index);
4850
4851 // skip private, static, and <init> methods
4852 if ((!m->is_private() && !m->is_static()) &&
4853 (m->name() != vmSymbols::object_initializer_name())) {
4854
4855 const Symbol* const name = m->name();
4856 const Symbol* const signature = m->signature();
4857 const Klass* k = this_klass->super();
4858 const Method* super_m = NULL;
4859 while (k != NULL) {
4860 // skip supers that don't have final methods.
4861 if (k->has_final_method()) {
4862 // lookup a matching method in the super class hierarchy
4863 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4864 if (super_m == NULL) {
4865 break; // didn't find any match; get out
4866 }
4867
4868 if (super_m->is_final() && !super_m->is_static() &&
4869 !super_m->access_flags().is_private()) {
4870 // matching method in super is final, and not static or private
4871 bool can_access = Reflection::verify_member_access(this_klass,
4872 super_m->method_holder(),
4873 super_m->method_holder(),
4874 super_m->access_flags(),
4875 false, false, CHECK);
4876 if (can_access) {
4877 // this class can access super final method and therefore override
4878 ResourceMark rm(THREAD);
4879 Exceptions::fthrow(THREAD_AND_LOCATION,
4880 vmSymbols::java_lang_VerifyError(),
4881 "class %s overrides final method %s.%s%s",
4882 this_klass->external_name(),
4883 super_m->method_holder()->external_name(),
4884 name->as_C_string(),
4885 signature->as_C_string()
4886 );
4887 return;
4888 }
4889 }
4890
4891 // continue to look from super_m's holder's super.
4892 k = super_m->method_holder()->super();
4893 continue;
4894 }
4895
4896 k = k->super();
4897 }
4898 }
4899 }
4900 }
4901
4902
4903 // assumes that this_klass is an interface
4904 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4905 assert(this_klass != NULL, "invariant");
4906 assert(this_klass->is_interface(), "not an interface");
4907 const Array<Method*>* methods = this_klass->methods();
4908 const int num_methods = methods->length();
4909
4910 for (int index = 0; index < num_methods; index++) {
4911 const Method* const m = methods->at(index);
4912 // if m is static and not the init method, throw a verify error
4913 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4914 ResourceMark rm(THREAD);
4915 Exceptions::fthrow(
4916 THREAD_AND_LOCATION,
4917 vmSymbols::java_lang_VerifyError(),
4918 "Illegal static method %s in interface %s",
4919 m->name()->as_C_string(),
4920 this_klass->external_name()
4921 );
4922 return;
4923 }
4924 }
4925 }
4926
4927 // utility methods for format checking
4928
4929 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4930 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4931 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4932 if (is_module) {
4933 ResourceMark rm(THREAD);
4934 Exceptions::fthrow(
4935 THREAD_AND_LOCATION,
4936 vmSymbols::java_lang_NoClassDefFoundError(),
4937 "%s is not a class because access_flag ACC_MODULE is set",
4938 _class_name->as_C_string());
4939 return;
4940 }
4941
4942 if (!_need_verify) { return; }
4943
4944 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4945 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4946 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4947 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4948 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4949 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4950 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4951 const bool major_gte_14 = _major_version >= JAVA_14_VERSION;
4952
4953 if ((is_abstract && is_final) ||
4954 (is_interface && !is_abstract) ||
4955 (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
4956 (!is_interface && major_gte_1_5 && is_annotation)) {
4957 ResourceMark rm(THREAD);
4958 Exceptions::fthrow(
4959 THREAD_AND_LOCATION,
4960 vmSymbols::java_lang_ClassFormatError(),
4961 "Illegal class modifiers in class %s: 0x%X",
4962 _class_name->as_C_string(), flags
4963 );
4964 return;
4965 }
4966 }
4967
4968 static bool has_illegal_visibility(jint flags) {
4969 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4970 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4971 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4972
4973 return ((is_public && is_protected) ||
4974 (is_public && is_private) ||
4975 (is_protected && is_private));
4976 }
4977
4978 // A legal major_version.minor_version must be one of the following:
4979 //
4980 // Major_version >= 45 and major_version < 56, any minor_version.
4981 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4982 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4983 //
4984 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4985 ResourceMark rm(THREAD);
4986 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4987 if (major < JAVA_MIN_SUPPORTED_VERSION) {
4988 Exceptions::fthrow(
4989 THREAD_AND_LOCATION,
4990 vmSymbols::java_lang_UnsupportedClassVersionError(),
4991 "%s (class file version %u.%u) was compiled with an invalid major version",
4992 class_name->as_C_string(), major, minor);
4993 return;
4994 }
4995
4996 if (major > max_version) {
4997 Exceptions::fthrow(
4998 THREAD_AND_LOCATION,
4999 vmSymbols::java_lang_UnsupportedClassVersionError(),
5000 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5001 "this version of the Java Runtime only recognizes class file versions up to %u.0",
5002 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
5003 return;
5004 }
5005
5006 if (major < JAVA_12_VERSION || minor == 0) {
5007 return;
5008 }
5009
5010 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
5011 if (major != max_version) {
5012 Exceptions::fthrow(
5013 THREAD_AND_LOCATION,
5014 vmSymbols::java_lang_UnsupportedClassVersionError(),
5015 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
5016 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
5017 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
5018 return;
5019 }
5020
5021 if (!Arguments::enable_preview()) {
5022 Exceptions::fthrow(
5023 THREAD_AND_LOCATION,
5024 vmSymbols::java_lang_UnsupportedClassVersionError(),
5025 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
5026 class_name->as_C_string(), major, minor);
5027 return;
5028 }
5029
5030 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
5031 Exceptions::fthrow(
5032 THREAD_AND_LOCATION,
5033 vmSymbols::java_lang_UnsupportedClassVersionError(),
5034 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
5035 class_name->as_C_string(), major, minor);
5036 }
5037 }
5038
5039 void ClassFileParser::verify_legal_field_modifiers(jint flags,
5040 bool is_interface,
5041 TRAPS) const {
5042 if (!_need_verify) { return; }
5043
5044 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5045 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5046 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5047 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5048 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5049 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
5050 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
5051 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5052 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
5053
5054 bool is_illegal = false;
5055
5056 if (is_interface) {
5057 if (!is_public || !is_static || !is_final || is_private ||
5058 is_protected || is_volatile || is_transient ||
5059 (major_gte_1_5 && is_enum)) {
5060 is_illegal = true;
5061 }
5062 } else { // not interface
5063 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
5064 is_illegal = true;
5065 }
5066 }
5067
5068 if (is_illegal) {
5069 ResourceMark rm(THREAD);
5070 Exceptions::fthrow(
5071 THREAD_AND_LOCATION,
5072 vmSymbols::java_lang_ClassFormatError(),
5073 "Illegal field modifiers in class %s: 0x%X",
5074 _class_name->as_C_string(), flags);
5075 return;
5076 }
5077 }
5078
5079 void ClassFileParser::verify_legal_method_modifiers(jint flags,
5080 bool is_interface,
5081 const Symbol* name,
5082 TRAPS) const {
5083 if (!_need_verify) { return; }
5084
5085 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5086 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5087 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5088 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5089 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
5090 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5091 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
5092 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
5093 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
5094 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5095 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
5096 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
5097 const bool is_initializer = (name == vmSymbols::object_initializer_name());
5098
5099 bool is_illegal = false;
5100
5101 if (is_interface) {
5102 if (major_gte_8) {
5103 // Class file version is JAVA_8_VERSION or later Methods of
5104 // interfaces may set any of the flags except ACC_PROTECTED,
5105 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5106 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5107 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5108 (is_native || is_protected || is_final || is_synchronized) ||
5109 // If a specific method of a class or interface has its
5110 // ACC_ABSTRACT flag set, it must not have any of its
5111 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5112 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
5113 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5114 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5115 (is_abstract && (is_private || is_static || is_strict))) {
5116 is_illegal = true;
5117 }
5118 } else if (major_gte_1_5) {
5119 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5120 if (!is_public || is_private || is_protected || is_static || is_final ||
5121 is_synchronized || is_native || !is_abstract || is_strict) {
5122 is_illegal = true;
5123 }
5124 } else {
5125 // Class file version is pre-JAVA_1_5_VERSION
5126 if (!is_public || is_static || is_final || is_native || !is_abstract) {
5127 is_illegal = true;
5128 }
5129 }
5130 } else { // not interface
5131 if (has_illegal_visibility(flags)) {
5132 is_illegal = true;
5133 } else {
5134 if (is_initializer) {
5135 if (is_static || is_final || is_synchronized || is_native ||
5136 is_abstract || (major_gte_1_5 && is_bridge)) {
5137 is_illegal = true;
5138 }
5139 } else { // not initializer
5140 if (is_abstract) {
5141 if ((is_final || is_native || is_private || is_static ||
5142 (major_gte_1_5 && (is_synchronized || is_strict)))) {
5143 is_illegal = true;
5144 }
5145 }
5146 }
5147 }
5148 }
5149
5150 if (is_illegal) {
5151 ResourceMark rm(THREAD);
5152 Exceptions::fthrow(
5153 THREAD_AND_LOCATION,
5154 vmSymbols::java_lang_ClassFormatError(),
5155 "Method %s in class %s has illegal modifiers: 0x%X",
5156 name->as_C_string(), _class_name->as_C_string(), flags);
5157 return;
5158 }
5159 }
5160
5161 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5162 int length,
5163 TRAPS) const {
5164 assert(_need_verify, "only called when _need_verify is true");
5165 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5166 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5167 }
5168 }
5169
5170 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5171 // In class names, '/' separates unqualified names. This is verified in this function also.
5172 // Method names also may not contain the characters '<' or '>', unless <init>
5173 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5174 // method. Because these names have been checked as special cases before
5175 // calling this method in verify_legal_method_name.
5176 //
5177 // This method is also called from the modular system APIs in modules.cpp
5178 // to verify the validity of module and package names.
5179 bool ClassFileParser::verify_unqualified_name(const char* name,
5180 unsigned int length,
5181 int type) {
5182 if (length == 0) return false; // Must have at least one char.
5183 for (const char* p = name; p != name + length; p++) {
5184 switch(*p) {
5185 case JVM_SIGNATURE_DOT:
5186 case JVM_SIGNATURE_ENDCLASS:
5187 case JVM_SIGNATURE_ARRAY:
5188 // do not permit '.', ';', or '['
5189 return false;
5190 case JVM_SIGNATURE_SLASH:
5191 // check for '//' or leading or trailing '/' which are not legal
5192 // unqualified name must not be empty
5193 if (type == ClassFileParser::LegalClass) {
5194 if (p == name || p+1 >= name+length ||
5195 *(p+1) == JVM_SIGNATURE_SLASH) {
5196 return false;
5197 }
5198 } else {
5199 return false; // do not permit '/' unless it's class name
5200 }
5201 break;
5202 case JVM_SIGNATURE_SPECIAL:
5203 case JVM_SIGNATURE_ENDSPECIAL:
5204 // do not permit '<' or '>' in method names
5205 if (type == ClassFileParser::LegalMethod) {
5206 return false;
5207 }
5208 }
5209 }
5210 return true;
5211 }
5212
5213 // Take pointer to a UTF8 byte string (not NUL-terminated).
5214 // Skip over the longest part of the string that could
5215 // be taken as a fieldname. Allow '/' if slash_ok is true.
5216 // Return a pointer to just past the fieldname.
5217 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5218 // being true, we saw consecutive slashes (meaning we were looking for a
5219 // qualified path but found something that was badly-formed).
5220 static const char* skip_over_field_name(const char* const name,
5221 bool slash_ok,
5222 unsigned int length) {
5223 const char* p;
5224 jboolean last_is_slash = false;
5225 jboolean not_first_ch = false;
5226
5227 for (p = name; p != name + length; not_first_ch = true) {
5228 const char* old_p = p;
5229 jchar ch = *p;
5230 if (ch < 128) {
5231 p++;
5232 // quick check for ascii
5233 if ((ch >= 'a' && ch <= 'z') ||
5234 (ch >= 'A' && ch <= 'Z') ||
5235 (ch == '_' || ch == '$') ||
5236 (not_first_ch && ch >= '0' && ch <= '9')) {
5237 last_is_slash = false;
5238 continue;
5239 }
5240 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
5241 if (last_is_slash) {
5242 return NULL; // Don't permit consecutive slashes
5243 }
5244 last_is_slash = true;
5245 continue;
5246 }
5247 }
5248 else {
5249 jint unicode_ch;
5250 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5251 p = tmp_p;
5252 last_is_slash = false;
5253 // Check if ch is Java identifier start or is Java identifier part
5254 // 4672820: call java.lang.Character methods directly without generating separate tables.
5255 EXCEPTION_MARK;
5256 // return value
5257 JavaValue result(T_BOOLEAN);
5258 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
5259 JavaCallArguments args;
5260 args.push_int(unicode_ch);
5261
5262 if (not_first_ch) {
5263 // public static boolean isJavaIdentifierPart(char ch);
5264 JavaCalls::call_static(&result,
5265 SystemDictionary::Character_klass(),
5266 vmSymbols::isJavaIdentifierPart_name(),
5267 vmSymbols::int_bool_signature(),
5268 &args,
5269 THREAD);
5270 } else {
5271 // public static boolean isJavaIdentifierStart(char ch);
5272 JavaCalls::call_static(&result,
5273 SystemDictionary::Character_klass(),
5274 vmSymbols::isJavaIdentifierStart_name(),
5275 vmSymbols::int_bool_signature(),
5276 &args,
5277 THREAD);
5278 }
5279 if (HAS_PENDING_EXCEPTION) {
5280 CLEAR_PENDING_EXCEPTION;
5281 return NULL;
5282 }
5283 if(result.get_jboolean()) {
5284 continue;
5285 }
5286 }
5287 return (not_first_ch) ? old_p : NULL;
5288 }
5289 return (not_first_ch) ? p : NULL;
5290 }
5291
5292 // Take pointer to a UTF8 byte string (not NUL-terminated).
5293 // Skip over the longest part of the string that could
5294 // be taken as a field signature. Allow "void" if void_ok.
5295 // Return a pointer to just past the signature.
5296 // Return NULL if no legal signature is found.
5297 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5298 bool void_ok,
5299 unsigned int length,
5300 TRAPS) const {
5301 unsigned int array_dim = 0;
5302 while (length > 0) {
5303 switch (signature[0]) {
5304 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5305 case JVM_SIGNATURE_BOOLEAN:
5306 case JVM_SIGNATURE_BYTE:
5307 case JVM_SIGNATURE_CHAR:
5308 case JVM_SIGNATURE_SHORT:
5309 case JVM_SIGNATURE_INT:
5310 case JVM_SIGNATURE_FLOAT:
5311 case JVM_SIGNATURE_LONG:
5312 case JVM_SIGNATURE_DOUBLE:
5313 return signature + 1;
5314 case JVM_SIGNATURE_CLASS: {
5315 if (_major_version < JAVA_1_5_VERSION) {
5316 // Skip over the class name if one is there
5317 const char* const p = skip_over_field_name(signature + 1, true, --length);
5318
5319 // The next character better be a semicolon
5320 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
5321 return p + 1;
5322 }
5323 }
5324 else {
5325 // Skip leading 'L' and ignore first appearance of ';'
5326 signature++;
5327 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
5328 // Format check signature
5329 if (c != NULL) {
5330 int newlen = c - (char*) signature;
5331 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5332 if (!legal) {
5333 classfile_parse_error("Class name is empty or contains illegal character "
5334 "in descriptor in class file %s",
5335 CHECK_0);
5336 return NULL;
5337 }
5338 return signature + newlen + 1;
5339 }
5340 }
5341 return NULL;
5342 }
5343 case JVM_SIGNATURE_ARRAY:
5344 array_dim++;
5345 if (array_dim > 255) {
5346 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5347 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5348 }
5349 // The rest of what's there better be a legal signature
5350 signature++;
5351 length--;
5352 void_ok = false;
5353 break;
5354 default:
5355 return NULL;
5356 }
5357 }
5358 return NULL;
5359 }
5360
5361 // Checks if name is a legal class name.
5362 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5363 if (!_need_verify || _relax_verify) { return; }
5364
5365 assert(name->refcount() > 0, "symbol must be kept alive");
5366 char* bytes = (char*)name->bytes();
5367 unsigned int length = name->utf8_length();
5368 bool legal = false;
5369
5370 if (length > 0) {
5371 const char* p;
5372 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5373 p = skip_over_field_signature(bytes, false, length, CHECK);
5374 legal = (p != NULL) && ((p - bytes) == (int)length);
5375 } else if (_major_version < JAVA_1_5_VERSION) {
5376 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5377 p = skip_over_field_name(bytes, true, length);
5378 legal = (p != NULL) && ((p - bytes) == (int)length);
5379 }
5380 } else {
5381 // 4900761: relax the constraints based on JSR202 spec
5382 // Class names may be drawn from the entire Unicode character set.
5383 // Identifiers between '/' must be unqualified names.
5384 // The utf8 string has been verified when parsing cpool entries.
5385 legal = verify_unqualified_name(bytes, length, LegalClass);
5386 }
5387 }
5388 if (!legal) {
5389 ResourceMark rm(THREAD);
5390 assert(_class_name != NULL, "invariant");
5391 Exceptions::fthrow(
5392 THREAD_AND_LOCATION,
5393 vmSymbols::java_lang_ClassFormatError(),
5394 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5395 _class_name->as_C_string()
5396 );
5397 return;
5398 }
5399 }
5400
5401 // Checks if name is a legal field name.
5402 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5403 if (!_need_verify || _relax_verify) { return; }
5404
5405 char* bytes = (char*)name->bytes();
5406 unsigned int length = name->utf8_length();
5407 bool legal = false;
5408
5409 if (length > 0) {
5410 if (_major_version < JAVA_1_5_VERSION) {
5411 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5412 const char* p = skip_over_field_name(bytes, false, length);
5413 legal = (p != NULL) && ((p - bytes) == (int)length);
5414 }
5415 } else {
5416 // 4881221: relax the constraints based on JSR202 spec
5417 legal = verify_unqualified_name(bytes, length, LegalField);
5418 }
5419 }
5420
5421 if (!legal) {
5422 ResourceMark rm(THREAD);
5423 assert(_class_name != NULL, "invariant");
5424 Exceptions::fthrow(
5425 THREAD_AND_LOCATION,
5426 vmSymbols::java_lang_ClassFormatError(),
5427 "Illegal field name \"%.*s\" in class %s", length, bytes,
5428 _class_name->as_C_string()
5429 );
5430 return;
5431 }
5432 }
5433
5434 // Checks if name is a legal method name.
5435 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5436 if (!_need_verify || _relax_verify) { return; }
5437
5438 assert(name != NULL, "method name is null");
5439 char* bytes = (char*)name->bytes();
5440 unsigned int length = name->utf8_length();
5441 bool legal = false;
5442
5443 if (length > 0) {
5444 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5445 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5446 legal = true;
5447 }
5448 } else if (_major_version < JAVA_1_5_VERSION) {
5449 const char* p;
5450 p = skip_over_field_name(bytes, false, length);
5451 legal = (p != NULL) && ((p - bytes) == (int)length);
5452 } else {
5453 // 4881221: relax the constraints based on JSR202 spec
5454 legal = verify_unqualified_name(bytes, length, LegalMethod);
5455 }
5456 }
5457
5458 if (!legal) {
5459 ResourceMark rm(THREAD);
5460 assert(_class_name != NULL, "invariant");
5461 Exceptions::fthrow(
5462 THREAD_AND_LOCATION,
5463 vmSymbols::java_lang_ClassFormatError(),
5464 "Illegal method name \"%.*s\" in class %s", length, bytes,
5465 _class_name->as_C_string()
5466 );
5467 return;
5468 }
5469 }
5470
5471
5472 // Checks if signature is a legal field signature.
5473 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5474 const Symbol* signature,
5475 TRAPS) const {
5476 if (!_need_verify) { return; }
5477
5478 const char* const bytes = (const char* const)signature->bytes();
5479 const unsigned int length = signature->utf8_length();
5480 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5481
5482 if (p == NULL || (p - bytes) != (int)length) {
5483 throwIllegalSignature("Field", name, signature, CHECK);
5484 }
5485 }
5486
5487 // Checks if signature is a legal method signature.
5488 // Returns number of parameters
5489 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5490 const Symbol* signature,
5491 TRAPS) const {
5492 if (!_need_verify) {
5493 // make sure caller's args_size will be less than 0 even for non-static
5494 // method so it will be recomputed in compute_size_of_parameters().
5495 return -2;
5496 }
5497
5498 // Class initializers cannot have args for class format version >= 51.
5499 if (name == vmSymbols::class_initializer_name() &&
5500 signature != vmSymbols::void_method_signature() &&
5501 _major_version >= JAVA_7_VERSION) {
5502 throwIllegalSignature("Method", name, signature, CHECK_0);
5503 return 0;
5504 }
5505
5506 unsigned int args_size = 0;
5507 const char* p = (const char*)signature->bytes();
5508 unsigned int length = signature->utf8_length();
5509 const char* nextp;
5510
5511 // The first character must be a '('
5512 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5513 length--;
5514 // Skip over legal field signatures
5515 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5516 while ((length > 0) && (nextp != NULL)) {
5517 args_size++;
5518 if (p[0] == 'J' || p[0] == 'D') {
5519 args_size++;
5520 }
5521 length -= nextp - p;
5522 p = nextp;
5523 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5524 }
5525 // The first non-signature thing better be a ')'
5526 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5527 length--;
5528 if (name->utf8_length() > 0 && name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
5529 // All internal methods must return void
5530 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5531 return args_size;
5532 }
5533 } else {
5534 // Now we better just have a return value
5535 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5536 if (nextp && ((int)length == (nextp - p))) {
5537 return args_size;
5538 }
5539 }
5540 }
5541 }
5542 // Report error
5543 throwIllegalSignature("Method", name, signature, CHECK_0);
5544 return 0;
5545 }
5546
5547 int ClassFileParser::static_field_size() const {
5548 assert(_field_info != NULL, "invariant");
5549 return _field_info->static_field_size;
5550 }
5551
5552 int ClassFileParser::total_oop_map_count() const {
5553 assert(_field_info != NULL, "invariant");
5554 return _field_info->total_oop_map_count;
5555 }
5556
5557 jint ClassFileParser::layout_size() const {
5558 assert(_field_info != NULL, "invariant");
5559 return _field_info->instance_size;
5560 }
5561
5562 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5563 const Array<Method*>* methods) {
5564 assert(ik != NULL, "invariant");
5565 assert(methods != NULL, "invariant");
5566
5567 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5568 // (We used to do this lazily, but now we query it in Rewriter,
5569 // which is eagerly done for every method, so we might as well do it now,
5570 // when everything is fresh in memory.)
5571 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5572
5573 if (klass_id != vmSymbols::NO_SID) {
5574 for (int j = 0; j < methods->length(); ++j) {
5575 Method* method = methods->at(j);
5576 method->init_intrinsic_id();
5577
5578 if (CheckIntrinsics) {
5579 // Check if an intrinsic is defined for method 'method',
5580 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5581 if (method->intrinsic_id() != vmIntrinsics::_none &&
5582 !method->intrinsic_candidate()) {
5583 tty->print("Compiler intrinsic is defined for method [%s], "
5584 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5585 method->name_and_sig_as_C_string(),
5586 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5587 );
5588 tty->cr();
5589 DEBUG_ONLY(vm_exit(1));
5590 }
5591 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5592 // but there is no intrinsic available for it.
5593 if (method->intrinsic_candidate() &&
5594 method->intrinsic_id() == vmIntrinsics::_none) {
5595 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5596 "but no compiler intrinsic is defined for the method.%s",
5597 method->name_and_sig_as_C_string(),
5598 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5599 );
5600 tty->cr();
5601 DEBUG_ONLY(vm_exit(1));
5602 }
5603 }
5604 } // end for
5605
5606 #ifdef ASSERT
5607 if (CheckIntrinsics) {
5608 // Check for orphan methods in the current class. A method m
5609 // of a class C is orphan if an intrinsic is defined for method m,
5610 // but class C does not declare m.
5611 // The check is potentially expensive, therefore it is available
5612 // only in debug builds.
5613
5614 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5615 if (vmIntrinsics::_compiledLambdaForm == id) {
5616 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5617 // generated for the JVM from a LambdaForm and therefore no method
5618 // is defined for it.
5619 continue;
5620 }
5621
5622 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5623 // Check if the current class contains a method with the same
5624 // name, flags, signature.
5625 bool match = false;
5626 for (int j = 0; j < methods->length(); ++j) {
5627 const Method* method = methods->at(j);
5628 if (method->intrinsic_id() == id) {
5629 match = true;
5630 break;
5631 }
5632 }
5633
5634 if (!match) {
5635 char buf[1000];
5636 tty->print("Compiler intrinsic is defined for method [%s], "
5637 "but the method is not available in class [%s].%s",
5638 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5639 buf, sizeof(buf)),
5640 ik->name()->as_C_string(),
5641 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5642 );
5643 tty->cr();
5644 DEBUG_ONLY(vm_exit(1));
5645 }
5646 }
5647 } // end for
5648 } // CheckIntrinsics
5649 #endif // ASSERT
5650 }
5651 }
5652
5653 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5654 if (_klass != NULL) {
5655 return _klass;
5656 }
5657
5658 InstanceKlass* const ik =
5659 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5660
5661 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5662
5663 assert(_klass == ik, "invariant");
5664
5665
5666 if (ik->should_store_fingerprint()) {
5667 ik->store_fingerprint(_stream->compute_fingerprint());
5668 }
5669
5670 ik->set_has_passed_fingerprint_check(false);
5671 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5672 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5673 uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint();
5674 if (aot_fp != 0 && aot_fp == fp) {
5675 // This class matches with a class saved in an AOT library
5676 ik->set_has_passed_fingerprint_check(true);
5677 } else {
5678 ResourceMark rm;
5679 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5680 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5681 }
5682 }
5683
5684 return ik;
5685 }
5686
5687 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5688 assert(ik != NULL, "invariant");
5689
5690 // Set name and CLD before adding to CLD
5691 ik->set_class_loader_data(_loader_data);
5692 ik->set_name(_class_name);
5693
5694 // Add all classes to our internal class loader list here,
5695 // including classes in the bootstrap (NULL) class loader.
5696 const bool publicize = !is_internal();
5697
5698 _loader_data->add_class(ik, publicize);
5699
5700 set_klass_to_deallocate(ik);
5701
5702 assert(_field_info != NULL, "invariant");
5703 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5704 assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count,
5705 "sanity");
5706
5707 assert(ik->is_instance_klass(), "sanity");
5708 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5709
5710 // Fill in information already parsed
5711 ik->set_should_verify_class(_need_verify);
5712
5713 // Not yet: supers are done below to support the new subtype-checking fields
5714 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5715 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5716 assert(_fac != NULL, "invariant");
5717 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5718
5719 // this transfers ownership of a lot of arrays from
5720 // the parser onto the InstanceKlass*
5721 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5722
5723 // note that is not safe to use the fields in the parser from this point on
5724 assert(NULL == _cp, "invariant");
5725 assert(NULL == _fields, "invariant");
5726 assert(NULL == _methods, "invariant");
5727 assert(NULL == _inner_classes, "invariant");
5728 assert(NULL == _nest_members, "invariant");
5729 assert(NULL == _local_interfaces, "invariant");
5730 assert(NULL == _combined_annotations, "invariant");
5731 assert(NULL == _record_components, "invariant");
5732
5733 if (_has_final_method) {
5734 ik->set_has_final_method();
5735 }
5736
5737 ik->copy_method_ordering(_method_ordering, CHECK);
5738 // The InstanceKlass::_methods_jmethod_ids cache
5739 // is managed on the assumption that the initial cache
5740 // size is equal to the number of methods in the class. If
5741 // that changes, then InstanceKlass::idnum_can_increment()
5742 // has to be changed accordingly.
5743 ik->set_initial_method_idnum(ik->methods()->length());
5744
5745 ik->set_this_class_index(_this_class_index);
5746
5747 if (is_unsafe_anonymous()) {
5748 // _this_class_index is a CONSTANT_Class entry that refers to this
5749 // anonymous class itself. If this class needs to refer to its own methods or
5750 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5751 // _this_class_index. However, because this class is anonymous (it's
5752 // not stored in SystemDictionary), _this_class_index cannot be resolved
5753 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5754 // Therefore, we must eagerly resolve _this_class_index now.
5755 ik->constants()->klass_at_put(_this_class_index, ik);
5756 }
5757
5758 ik->set_minor_version(_minor_version);
5759 ik->set_major_version(_major_version);
5760 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5761 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5762
5763 if (_unsafe_anonymous_host != NULL) {
5764 assert (ik->is_unsafe_anonymous(), "should be the same");
5765 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host);
5766 }
5767
5768 // Set PackageEntry for this_klass
5769 oop cl = ik->class_loader();
5770 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5771 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5772 ik->set_package(cld, CHECK);
5773
5774 const Array<Method*>* const methods = ik->methods();
5775 assert(methods != NULL, "invariant");
5776 const int methods_len = methods->length();
5777
5778 check_methods_for_intrinsics(ik, methods);
5779
5780 // Fill in field values obtained by parse_classfile_attributes
5781 if (_parsed_annotations->has_any_annotations()) {
5782 _parsed_annotations->apply_to(ik);
5783 }
5784
5785 apply_parsed_class_attributes(ik);
5786
5787 // Miranda methods
5788 if ((_num_miranda_methods > 0) ||
5789 // if this class introduced new miranda methods or
5790 (_super_klass != NULL && _super_klass->has_miranda_methods())
5791 // super class exists and this class inherited miranda methods
5792 ) {
5793 ik->set_has_miranda_methods(); // then set a flag
5794 }
5795
5796 // Fill in information needed to compute superclasses.
5797 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5798 ik->set_transitive_interfaces(_transitive_interfaces);
5799 _transitive_interfaces = NULL;
5800
5801 // Initialize itable offset tables
5802 klassItable::setup_itable_offset_table(ik);
5803
5804 // Compute transitive closure of interfaces this class implements
5805 // Do final class setup
5806 fill_oop_maps(ik,
5807 _field_info->nonstatic_oop_map_count,
5808 _field_info->nonstatic_oop_offsets,
5809 _field_info->nonstatic_oop_counts);
5810
5811 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5812 set_precomputed_flags(ik);
5813
5814 // check if this class can access its super class
5815 check_super_class_access(ik, CHECK);
5816
5817 // check if this class can access its superinterfaces
5818 check_super_interface_access(ik, CHECK);
5819
5820 // check if this class overrides any final method
5821 check_final_method_override(ik, CHECK);
5822
5823 // reject static interface methods prior to Java 8
5824 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5825 check_illegal_static_method(ik, CHECK);
5826 }
5827
5828 // Obtain this_klass' module entry
5829 ModuleEntry* module_entry = ik->module();
5830 assert(module_entry != NULL, "module_entry should always be set");
5831
5832 // Obtain java.lang.Module
5833 Handle module_handle(THREAD, module_entry->module());
5834
5835 // Allocate mirror and initialize static fields
5836 // The create_mirror() call will also call compute_modifiers()
5837 java_lang_Class::create_mirror(ik,
5838 Handle(THREAD, _loader_data->class_loader()),
5839 module_handle,
5840 _protection_domain,
5841 CHECK);
5842
5843 assert(_all_mirandas != NULL, "invariant");
5844
5845 // Generate any default methods - default methods are public interface methods
5846 // that have a default implementation. This is new with Java 8.
5847 if (_has_nonstatic_concrete_methods) {
5848 DefaultMethods::generate_default_methods(ik,
5849 _all_mirandas,
5850 CHECK);
5851 }
5852
5853 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5854 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5855 !module_entry->has_default_read_edges()) {
5856 if (!module_entry->set_has_default_read_edges()) {
5857 // We won a potential race
5858 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5859 }
5860 }
5861
5862 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5863
5864 if (!is_internal()) {
5865 if (log_is_enabled(Info, class, load)) {
5866 ResourceMark rm;
5867 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5868 ik->print_class_load_logging(_loader_data, module_name, _stream);
5869 }
5870
5871 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5872 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5873 log_is_enabled(Info, class, preview)) {
5874 ResourceMark rm;
5875 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5876 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5877 }
5878
5879 if (log_is_enabled(Debug, class, resolve)) {
5880 ResourceMark rm;
5881 // print out the superclass.
5882 const char * from = ik->external_name();
5883 if (ik->java_super() != NULL) {
5884 log_debug(class, resolve)("%s %s (super)",
5885 from,
5886 ik->java_super()->external_name());
5887 }
5888 // print out each of the interface classes referred to by this class.
5889 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5890 if (local_interfaces != NULL) {
5891 const int length = local_interfaces->length();
5892 for (int i = 0; i < length; i++) {
5893 const InstanceKlass* const k = local_interfaces->at(i);
5894 const char * to = k->external_name();
5895 log_debug(class, resolve)("%s %s (interface)", from, to);
5896 }
5897 }
5898 }
5899 }
5900
5901 JFR_ONLY(INIT_ID(ik);)
5902
5903 // If we reach here, all is well.
5904 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5905 // in order for it to not be destroyed in the ClassFileParser destructor.
5906 set_klass_to_deallocate(NULL);
5907
5908 // it's official
5909 set_klass(ik);
5910
5911 debug_only(ik->verify();)
5912 }
5913
5914 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5915 // Decrement the refcount in the old name, since we're clobbering it.
5916 _class_name->decrement_refcount();
5917
5918 _class_name = new_class_name;
5919 // Increment the refcount of the new name.
5920 // Now the ClassFileParser owns this name and will decrement in
5921 // the destructor.
5922 _class_name->increment_refcount();
5923 }
5924
5925
5926 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's
5927 // package by prepending its host class's package name to its class name and setting
5928 // its _class_name field.
5929 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) {
5930 ResourceMark rm(THREAD);
5931 assert(strrchr(_class_name->as_C_string(), JVM_SIGNATURE_SLASH) == NULL,
5932 "Unsafe anonymous class should not be in a package");
5933 const char* host_pkg_name =
5934 ClassLoader::package_from_name(unsafe_anonymous_host->name()->as_C_string(), NULL);
5935
5936 if (host_pkg_name != NULL) {
5937 int host_pkg_len = (int)strlen(host_pkg_name);
5938 int class_name_len = _class_name->utf8_length();
5939 int symbol_len = host_pkg_len + 1 + class_name_len;
5940 char* new_anon_name = NEW_RESOURCE_ARRAY(char, symbol_len + 1);
5941 int n = os::snprintf(new_anon_name, symbol_len + 1, "%s/%.*s",
5942 host_pkg_name, class_name_len, _class_name->base());
5943 assert(n == symbol_len, "Unexpected number of characters in string");
5944
5945 // Decrement old _class_name to avoid leaking.
5946 _class_name->decrement_refcount();
5947
5948 // Create a symbol and update the anonymous class name.
5949 // The new class name is created with a refcount of one. When installed into the InstanceKlass,
5950 // it'll be two and when the ClassFileParser destructor runs, it'll go back to one and get deleted
5951 // when the class is unloaded.
5952 _class_name = SymbolTable::new_symbol(new_anon_name, symbol_len);
5953 }
5954 }
5955
5956 // If the host class and the anonymous class are in the same package then do
5957 // nothing. If the anonymous class is in the unnamed package then move it to its
5958 // host's package. If the classes are in different packages then throw an IAE
5959 // exception.
5960 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) {
5961 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class");
5962
5963 const jbyte* anon_last_slash = UTF8::strrchr((const jbyte*)_class_name->base(),
5964 _class_name->utf8_length(), JVM_SIGNATURE_SLASH);
5965 if (anon_last_slash == NULL) { // Unnamed package
5966 prepend_host_package_name(_unsafe_anonymous_host, CHECK);
5967 } else {
5968 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) {
5969 ResourceMark rm(THREAD);
5970 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
5971 err_msg("Host class %s and anonymous class %s are in different packages",
5972 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string()));
5973 }
5974 }
5975 }
5976
5977 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5978 bool trusted = (loader_data->is_the_null_class_loader_data() ||
5979 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
5980 bool need_verify =
5981 // verifyAll
5982 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5983 // verifyRemote
5984 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5985 return !need_verify;
5986 }
5987
5988 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5989 Symbol* name,
5990 ClassLoaderData* loader_data,
5991 Handle protection_domain,
5992 const InstanceKlass* unsafe_anonymous_host,
5993 GrowableArray<Handle>* cp_patches,
5994 Publicity pub_level,
5995 TRAPS) :
5996 _stream(stream),
5997 _requested_name(name),
5998 _class_name(NULL),
5999 _loader_data(loader_data),
6000 _unsafe_anonymous_host(unsafe_anonymous_host),
6001 _cp_patches(cp_patches),
6002 _num_patched_klasses(0),
6003 _max_num_patched_klasses(0),
6004 _orig_cp_size(0),
6005 _first_patched_klass_resolved_index(0),
6006 _super_klass(),
6007 _cp(NULL),
6008 _fields(NULL),
6009 _methods(NULL),
6010 _inner_classes(NULL),
6011 _nest_members(NULL),
6012 _nest_host(0),
6013 _record_components(NULL),
6014 _local_interfaces(NULL),
6015 _transitive_interfaces(NULL),
6016 _combined_annotations(NULL),
6017 _class_annotations(NULL),
6018 _class_type_annotations(NULL),
6019 _fields_annotations(NULL),
6020 _fields_type_annotations(NULL),
6021 _klass(NULL),
6022 _klass_to_deallocate(NULL),
6023 _parsed_annotations(NULL),
6024 _fac(NULL),
6025 _field_info(NULL),
6026 _method_ordering(NULL),
6027 _all_mirandas(NULL),
6028 _vtable_size(0),
6029 _itable_size(0),
6030 _num_miranda_methods(0),
6031 _rt(REF_NONE),
6032 _protection_domain(protection_domain),
6033 _access_flags(),
6034 _pub_level(pub_level),
6035 _bad_constant_seen(0),
6036 _synthetic_flag(false),
6037 _sde_length(false),
6038 _sde_buffer(NULL),
6039 _sourcefile_index(0),
6040 _generic_signature_index(0),
6041 _major_version(0),
6042 _minor_version(0),
6043 _this_class_index(0),
6044 _super_class_index(0),
6045 _itfs_len(0),
6046 _java_fields_count(0),
6047 _need_verify(false),
6048 _relax_verify(false),
6049 _has_nonstatic_concrete_methods(false),
6050 _declares_nonstatic_concrete_methods(false),
6051 _has_final_method(false),
6052 _has_finalizer(false),
6053 _has_empty_finalizer(false),
6054 _has_vanilla_constructor(false),
6055 _max_bootstrap_specifier_index(-1) {
6056
6057 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6058 _class_name->increment_refcount();
6059
6060 assert(THREAD->is_Java_thread(), "invariant");
6061 assert(_loader_data != NULL, "invariant");
6062 assert(stream != NULL, "invariant");
6063 assert(_stream != NULL, "invariant");
6064 assert(_stream->buffer() == _stream->current(), "invariant");
6065 assert(_class_name != NULL, "invariant");
6066 assert(0 == _access_flags.as_int(), "invariant");
6067
6068 // Figure out whether we can skip format checking (matching classic VM behavior)
6069 if (DumpSharedSpaces) {
6070 // verify == true means it's a 'remote' class (i.e., non-boot class)
6071 // Verification decision is based on BytecodeVerificationRemote flag
6072 // for those classes.
6073 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
6074 BytecodeVerificationLocal;
6075 }
6076 else {
6077 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
6078 stream->need_verify());
6079 }
6080 if (_cp_patches != NULL) {
6081 int len = _cp_patches->length();
6082 for (int i=0; i<len; i++) {
6083 if (has_cp_patch_at(i)) {
6084 Handle patch = cp_patch_at(i);
6085 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
6086 // We need to append the names of the patched classes to the end of the constant pool,
6087 // because a patched class may have a Utf8 name that's not already included in the
6088 // original constant pool. These class names are used when patch_constant_pool()
6089 // calls patch_class().
6090 //
6091 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
6092 // At this point, we don't know the tag for index i yet, because we haven't parsed the
6093 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
6094 _max_num_patched_klasses++;
6095 }
6096 }
6097 }
6098 }
6099
6100 // synch back verification state to stream
6101 stream->set_verify(_need_verify);
6102
6103 // Check if verification needs to be relaxed for this class file
6104 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
6105 _relax_verify = relax_format_check_for(_loader_data);
6106
6107 parse_stream(stream, CHECK);
6108
6109 post_process_parsed_stream(stream, _cp, CHECK);
6110 }
6111
6112 void ClassFileParser::clear_class_metadata() {
6113 // metadata created before the instance klass is created. Must be
6114 // deallocated if classfile parsing returns an error.
6115 _cp = NULL;
6116 _fields = NULL;
6117 _methods = NULL;
6118 _inner_classes = NULL;
6119 _nest_members = NULL;
6120 _local_interfaces = NULL;
6121 _combined_annotations = NULL;
6122 _class_annotations = _class_type_annotations = NULL;
6123 _fields_annotations = _fields_type_annotations = NULL;
6124 _record_components = NULL;
6125 }
6126
6127 // Destructor to clean up
6128 ClassFileParser::~ClassFileParser() {
6129 _class_name->decrement_refcount();
6130
6131 if (_cp != NULL) {
6132 MetadataFactory::free_metadata(_loader_data, _cp);
6133 }
6134 if (_fields != NULL) {
6135 MetadataFactory::free_array<u2>(_loader_data, _fields);
6136 }
6137
6138 if (_methods != NULL) {
6139 // Free methods
6140 InstanceKlass::deallocate_methods(_loader_data, _methods);
6141 }
6142
6143 // beware of the Universe::empty_blah_array!!
6144 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6145 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6146 }
6147
6148 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
6149 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6150 }
6151
6152 if (_record_components != NULL) {
6153 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
6154 }
6155
6156 // Free interfaces
6157 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6158 _local_interfaces, _transitive_interfaces);
6159
6160 if (_combined_annotations != NULL) {
6161 // After all annotations arrays have been created, they are installed into the
6162 // Annotations object that will be assigned to the InstanceKlass being created.
6163
6164 // Deallocate the Annotations object and the installed annotations arrays.
6165 _combined_annotations->deallocate_contents(_loader_data);
6166
6167 // If the _combined_annotations pointer is non-NULL,
6168 // then the other annotations fields should have been cleared.
6169 assert(_class_annotations == NULL, "Should have been cleared");
6170 assert(_class_type_annotations == NULL, "Should have been cleared");
6171 assert(_fields_annotations == NULL, "Should have been cleared");
6172 assert(_fields_type_annotations == NULL, "Should have been cleared");
6173 } else {
6174 // If the annotations arrays were not installed into the Annotations object,
6175 // then they have to be deallocated explicitly.
6176 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
6177 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
6178 Annotations::free_contents(_loader_data, _fields_annotations);
6179 Annotations::free_contents(_loader_data, _fields_type_annotations);
6180 }
6181
6182 clear_class_metadata();
6183 _transitive_interfaces = NULL;
6184
6185 // deallocate the klass if already created. Don't directly deallocate, but add
6186 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6187 // at a safepoint.
6188 if (_klass_to_deallocate != NULL) {
6189 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6190 }
6191 }
6192
6193 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6194 TRAPS) {
6195
6196 assert(stream != NULL, "invariant");
6197 assert(_class_name != NULL, "invariant");
6198
6199 // BEGIN STREAM PARSING
6200 stream->guarantee_more(8, CHECK); // magic, major, minor
6201 // Magic value
6202 const u4 magic = stream->get_u4_fast();
6203 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6204 "Incompatible magic value %u in class file %s",
6205 magic, CHECK);
6206
6207 // Version numbers
6208 _minor_version = stream->get_u2_fast();
6209 _major_version = stream->get_u2_fast();
6210
6211 if (DumpSharedSpaces && _major_version < JAVA_6_VERSION) {
6212 ResourceMark rm;
6213 warning("Pre JDK 6 class not supported by CDS: %u.%u %s",
6214 _major_version, _minor_version, _class_name->as_C_string());
6215 Exceptions::fthrow(
6216 THREAD_AND_LOCATION,
6217 vmSymbols::java_lang_UnsupportedClassVersionError(),
6218 "Unsupported major.minor version for dump time %u.%u",
6219 _major_version,
6220 _minor_version);
6221 }
6222
6223 // Check version numbers - we check this even with verifier off
6224 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6225
6226 stream->guarantee_more(3, CHECK); // length, first cp tag
6227 u2 cp_size = stream->get_u2_fast();
6228
6229 guarantee_property(
6230 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6231 cp_size, CHECK);
6232
6233 _orig_cp_size = cp_size;
6234 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6235 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6236 }
6237 cp_size += _max_num_patched_klasses;
6238
6239 _cp = ConstantPool::allocate(_loader_data,
6240 cp_size,
6241 CHECK);
6242
6243 ConstantPool* const cp = _cp;
6244
6245 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6246
6247 assert(cp_size == (const u2)cp->length(), "invariant");
6248
6249 // ACCESS FLAGS
6250 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6251
6252 // Access flags
6253 jint flags;
6254 // JVM_ACC_MODULE is defined in JDK-9 and later.
6255 if (_major_version >= JAVA_9_VERSION) {
6256 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
6257 } else {
6258 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
6259 }
6260
6261 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6262 // Set abstract bit for old class files for backward compatibility
6263 flags |= JVM_ACC_ABSTRACT;
6264 }
6265
6266 verify_legal_class_modifiers(flags, CHECK);
6267
6268 short bad_constant = class_bad_constant_seen();
6269 if (bad_constant != 0) {
6270 // Do not throw CFE until after the access_flags are checked because if
6271 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6272 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6273 }
6274
6275 _access_flags.set_flags(flags);
6276
6277 // This class and superclass
6278 _this_class_index = stream->get_u2_fast();
6279 check_property(
6280 valid_cp_range(_this_class_index, cp_size) &&
6281 cp->tag_at(_this_class_index).is_unresolved_klass(),
6282 "Invalid this class index %u in constant pool in class file %s",
6283 _this_class_index, CHECK);
6284
6285 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6286 assert(class_name_in_cp != NULL, "class_name can't be null");
6287
6288 // Update _class_name to reflect the name in the constant pool
6289 update_class_name(class_name_in_cp);
6290
6291 // Don't need to check whether this class name is legal or not.
6292 // It has been checked when constant pool is parsed.
6293 // However, make sure it is not an array type.
6294 if (_need_verify) {
6295 guarantee_property(_class_name->char_at(0) != JVM_SIGNATURE_ARRAY,
6296 "Bad class name in class file %s",
6297 CHECK);
6298 }
6299
6300 // Checks if name in class file matches requested name
6301 if (_requested_name != NULL && _requested_name != _class_name) {
6302 ResourceMark rm(THREAD);
6303 Exceptions::fthrow(
6304 THREAD_AND_LOCATION,
6305 vmSymbols::java_lang_NoClassDefFoundError(),
6306 "%s (wrong name: %s)",
6307 _class_name->as_C_string(),
6308 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6309 );
6310 return;
6311 }
6312
6313 // if this is an anonymous class fix up its name if it's in the unnamed
6314 // package. Otherwise, throw IAE if it is in a different package than
6315 // its host class.
6316 if (_unsafe_anonymous_host != NULL) {
6317 fix_unsafe_anonymous_class_name(CHECK);
6318 }
6319
6320 // Verification prevents us from creating names with dots in them, this
6321 // asserts that that's the case.
6322 assert(is_internal_format(_class_name), "external class name format used internally");
6323
6324 if (!is_internal()) {
6325 LogTarget(Debug, class, preorder) lt;
6326 if (lt.is_enabled()){
6327 ResourceMark rm(THREAD);
6328 LogStream ls(lt);
6329 ls.print("%s", _class_name->as_klass_external_name());
6330 if (stream->source() != NULL) {
6331 ls.print(" source: %s", stream->source());
6332 }
6333 ls.cr();
6334 }
6335
6336 #if INCLUDE_CDS
6337 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6338 if (!ClassLoader::has_jrt_entry()) {
6339 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6340 DumpLoadedClassList = NULL;
6341 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6342 _unsafe_anonymous_host == NULL) {
6343 // Only dump the classes that can be stored into CDS archive.
6344 // Unsafe anonymous classes such as generated LambdaForm classes are also not included.
6345 oop class_loader = _loader_data->class_loader();
6346 ResourceMark rm(THREAD);
6347 bool skip = false;
6348 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6349 // For the boot and platform class loaders, skip classes that are not found in the
6350 // java runtime image, such as those found in the --patch-module entries.
6351 // These classes can't be loaded from the archive during runtime.
6352 if (!stream->from_boot_loader_modules_image() && strncmp(stream->source(), "jrt:", 4) != 0) {
6353 skip = true;
6354 }
6355
6356 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6357 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6358 // as they can be loaded from the archive during runtime.
6359 skip = false;
6360 }
6361 }
6362 if (skip) {
6363 tty->print_cr("skip writing class %s from source %s to classlist file",
6364 _class_name->as_C_string(), stream->source());
6365 } else {
6366 classlist_file->print_cr("%s", _class_name->as_C_string());
6367 classlist_file->flush();
6368 }
6369 }
6370 }
6371 #endif
6372 }
6373
6374 // SUPERKLASS
6375 _super_class_index = stream->get_u2_fast();
6376 _super_klass = parse_super_class(cp,
6377 _super_class_index,
6378 _need_verify,
6379 CHECK);
6380
6381 // Interfaces
6382 _itfs_len = stream->get_u2_fast();
6383 parse_interfaces(stream,
6384 _itfs_len,
6385 cp,
6386 &_has_nonstatic_concrete_methods,
6387 CHECK);
6388
6389 assert(_local_interfaces != NULL, "invariant");
6390
6391 // Fields (offsets are filled in later)
6392 _fac = new FieldAllocationCount();
6393 parse_fields(stream,
6394 _access_flags.is_interface(),
6395 _fac,
6396 cp,
6397 cp_size,
6398 &_java_fields_count,
6399 CHECK);
6400
6401 assert(_fields != NULL, "invariant");
6402
6403 // Methods
6404 AccessFlags promoted_flags;
6405 parse_methods(stream,
6406 _access_flags.is_interface(),
6407 &promoted_flags,
6408 &_has_final_method,
6409 &_declares_nonstatic_concrete_methods,
6410 CHECK);
6411
6412 assert(_methods != NULL, "invariant");
6413
6414 // promote flags from parse_methods() to the klass' flags
6415 _access_flags.add_promoted_flags(promoted_flags.as_int());
6416
6417 if (_declares_nonstatic_concrete_methods) {
6418 _has_nonstatic_concrete_methods = true;
6419 }
6420
6421 // Additional attributes/annotations
6422 _parsed_annotations = new ClassAnnotationCollector();
6423 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6424
6425 assert(_inner_classes != NULL, "invariant");
6426
6427 // Finalize the Annotations metadata object,
6428 // now that all annotation arrays have been created.
6429 create_combined_annotations(CHECK);
6430
6431 // Make sure this is the end of class file stream
6432 guarantee_property(stream->at_eos(),
6433 "Extra bytes at the end of class file %s",
6434 CHECK);
6435
6436 // all bytes in stream read and parsed
6437 }
6438
6439 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6440 ConstantPool* cp,
6441 TRAPS) {
6442 assert(stream != NULL, "invariant");
6443 assert(stream->at_eos(), "invariant");
6444 assert(cp != NULL, "invariant");
6445 assert(_loader_data != NULL, "invariant");
6446
6447 if (_class_name == vmSymbols::java_lang_Object()) {
6448 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6449 "java.lang.Object cannot implement an interface in class file %s",
6450 CHECK);
6451 }
6452 // We check super class after class file is parsed and format is checked
6453 if (_super_class_index > 0 && NULL ==_super_klass) {
6454 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6455 if (_access_flags.is_interface()) {
6456 // Before attempting to resolve the superclass, check for class format
6457 // errors not checked yet.
6458 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6459 "Interfaces must have java.lang.Object as superclass in class file %s",
6460 CHECK);
6461 }
6462 Handle loader(THREAD, _loader_data->class_loader());
6463 _super_klass = (const InstanceKlass*)
6464 SystemDictionary::resolve_super_or_fail(_class_name,
6465 super_class_name,
6466 loader,
6467 _protection_domain,
6468 true,
6469 CHECK);
6470 }
6471
6472 if (_super_klass != NULL) {
6473 if (_super_klass->has_nonstatic_concrete_methods()) {
6474 _has_nonstatic_concrete_methods = true;
6475 }
6476
6477 if (_super_klass->is_interface()) {
6478 ResourceMark rm(THREAD);
6479 Exceptions::fthrow(
6480 THREAD_AND_LOCATION,
6481 vmSymbols::java_lang_IncompatibleClassChangeError(),
6482 "class %s has interface %s as super class",
6483 _class_name->as_klass_external_name(),
6484 _super_klass->external_name()
6485 );
6486 return;
6487 }
6488 // Make sure super class is not final
6489 if (_super_klass->is_final()) {
6490 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6491 }
6492 }
6493
6494 // Compute the transitive list of all unique interfaces implemented by this class
6495 _transitive_interfaces =
6496 compute_transitive_interfaces(_super_klass,
6497 _local_interfaces,
6498 _loader_data,
6499 CHECK);
6500
6501 assert(_transitive_interfaces != NULL, "invariant");
6502
6503 // sort methods
6504 _method_ordering = sort_methods(_methods);
6505
6506 _all_mirandas = new GrowableArray<Method*>(20);
6507
6508 Handle loader(THREAD, _loader_data->class_loader());
6509 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6510 &_num_miranda_methods,
6511 _all_mirandas,
6512 _super_klass,
6513 _methods,
6514 _access_flags,
6515 _major_version,
6516 loader,
6517 _class_name,
6518 _local_interfaces,
6519 CHECK);
6520
6521 // Size of Java itable (in words)
6522 _itable_size = _access_flags.is_interface() ? 0 :
6523 klassItable::compute_itable_size(_transitive_interfaces);
6524
6525 assert(_fac != NULL, "invariant");
6526 assert(_parsed_annotations != NULL, "invariant");
6527
6528 _field_info = new FieldLayoutInfo();
6529 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6530
6531 // Compute reference typ
6532 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6533
6534 }
6535
6536 void ClassFileParser::set_klass(InstanceKlass* klass) {
6537
6538 #ifdef ASSERT
6539 if (klass != NULL) {
6540 assert(NULL == _klass, "leaking?");
6541 }
6542 #endif
6543
6544 _klass = klass;
6545 }
6546
6547 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6548
6549 #ifdef ASSERT
6550 if (klass != NULL) {
6551 assert(NULL == _klass_to_deallocate, "leaking?");
6552 }
6553 #endif
6554
6555 _klass_to_deallocate = klass;
6556 }
6557
6558 // Caller responsible for ResourceMark
6559 // clone stream with rewound position
6560 const ClassFileStream* ClassFileParser::clone_stream() const {
6561 assert(_stream != NULL, "invariant");
6562
6563 return _stream->clone();
6564 }
6565 // ----------------------------------------------------------------------------
6566 // debugging
6567
6568 #ifdef ASSERT
6569
6570 // return true if class_name contains no '.' (internal format is '/')
6571 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6572 if (class_name != NULL) {
6573 ResourceMark rm;
6574 char* name = class_name->as_C_string();
6575 return strchr(name, JVM_SIGNATURE_DOT) == NULL;
6576 } else {
6577 return true;
6578 }
6579 }
6580
6581 #endif