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 == JAVA_15_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_15_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 59.65535 and --enable-preview wasn't
3728 // specified then a java.lang.UnsupportedClassVersionError
3729 // exception would have been thrown.
3730 ResourceMark rm(THREAD);
3731 log_info(class, record)("Ignoring Record attribute in class %s because %s",
3732 _class_name->as_C_string(),
3733 supports_records() ? "super type is not java.lang.Record" :
3734 "class file version is not 59.65535");
3735 }
3736 cfs->skip_u1(attribute_length, CHECK);
3737 } else {
3738 // Unknown attribute
3739 cfs->skip_u1(attribute_length, CHECK);
3740 }
3741 } else {
3742 // Unknown attribute
3743 cfs->skip_u1(attribute_length, CHECK);
3744 }
3745 } else {
3746 // Unknown attribute
3747 cfs->skip_u1(attribute_length, CHECK);
3748 }
3749 } else {
3750 // Unknown attribute
3751 cfs->skip_u1(attribute_length, CHECK);
3752 }
3753 }
3754 _class_annotations = assemble_annotations(runtime_visible_annotations,
3755 runtime_visible_annotations_length,
3756 runtime_invisible_annotations,
3757 runtime_invisible_annotations_length,
3758 CHECK);
3759 _class_type_annotations = assemble_annotations(runtime_visible_type_annotations,
3760 runtime_visible_type_annotations_length,
3761 runtime_invisible_type_annotations,
3762 runtime_invisible_type_annotations_length,
3763 CHECK);
3764
3765 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3766 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3767 cfs,
3768 inner_classes_attribute_start,
3769 parsed_innerclasses_attribute,
3770 enclosing_method_class_index,
3771 enclosing_method_method_index,
3772 CHECK);
3773 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3774 guarantee_property(
3775 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3776 "Wrong InnerClasses attribute length in class file %s", CHECK);
3777 }
3778 }
3779
3780 if (parsed_nest_members_attribute) {
3781 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3782 cfs,
3783 nest_members_attribute_start,
3784 CHECK);
3785 if (_need_verify) {
3786 guarantee_property(
3787 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3788 "Wrong NestMembers attribute length in class file %s", CHECK);
3789 }
3790 }
3791
3792 if (parsed_record_attribute) {
3793 const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3794 cfs,
3795 cp,
3796 record_attribute_start,
3797 CHECK);
3798 if (_need_verify) {
3799 guarantee_property(record_attribute_length == calculated_attr_length,
3800 "Record attribute has wrong length in class file %s",
3801 CHECK);
3802 }
3803 }
3804
3805 if (_max_bootstrap_specifier_index >= 0) {
3806 guarantee_property(parsed_bootstrap_methods_attribute,
3807 "Missing BootstrapMethods attribute in class file %s", CHECK);
3808 }
3809 }
3810
3811 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3812 assert(k != NULL, "invariant");
3813
3814 if (_synthetic_flag)
3815 k->set_is_synthetic();
3816 if (_sourcefile_index != 0) {
3817 k->set_source_file_name_index(_sourcefile_index);
3818 }
3819 if (_generic_signature_index != 0) {
3820 k->set_generic_signature_index(_generic_signature_index);
3821 }
3822 if (_sde_buffer != NULL) {
3823 k->set_source_debug_extension(_sde_buffer, _sde_length);
3824 }
3825 }
3826
3827 // Create the Annotations object that will
3828 // hold the annotations array for the Klass.
3829 void ClassFileParser::create_combined_annotations(TRAPS) {
3830 if (_class_annotations == NULL &&
3831 _class_type_annotations == NULL &&
3832 _fields_annotations == NULL &&
3833 _fields_type_annotations == NULL) {
3834 // Don't create the Annotations object unnecessarily.
3835 return;
3836 }
3837
3838 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3839 annotations->set_class_annotations(_class_annotations);
3840 annotations->set_class_type_annotations(_class_type_annotations);
3841 annotations->set_fields_annotations(_fields_annotations);
3842 annotations->set_fields_type_annotations(_fields_type_annotations);
3843
3844 // This is the Annotations object that will be
3845 // assigned to InstanceKlass being constructed.
3846 _combined_annotations = annotations;
3847
3848 // The annotations arrays below has been transfered the
3849 // _combined_annotations so these fields can now be cleared.
3850 _class_annotations = NULL;
3851 _class_type_annotations = NULL;
3852 _fields_annotations = NULL;
3853 _fields_type_annotations = NULL;
3854 }
3855
3856 // Transfer ownership of metadata allocated to the InstanceKlass.
3857 void ClassFileParser::apply_parsed_class_metadata(
3858 InstanceKlass* this_klass,
3859 int java_fields_count,
3860 TRAPS) {
3861 assert(this_klass != NULL, "invariant");
3862
3863 _cp->set_pool_holder(this_klass);
3864 this_klass->set_constants(_cp);
3865 this_klass->set_fields(_fields, java_fields_count);
3866 this_klass->set_methods(_methods);
3867 this_klass->set_inner_classes(_inner_classes);
3868 this_klass->set_nest_members(_nest_members);
3869 this_klass->set_nest_host_index(_nest_host);
3870 this_klass->set_local_interfaces(_local_interfaces);
3871 this_klass->set_annotations(_combined_annotations);
3872 this_klass->set_record_components(_record_components);
3873 // Delay the setting of _transitive_interfaces until after initialize_supers() in
3874 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with
3875 // its _super. If an OOM occurs while loading the current klass, its _super field
3876 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3877 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3878 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3879
3880 // Clear out these fields so they don't get deallocated by the destructor
3881 clear_class_metadata();
3882 }
3883
3884 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3885 int runtime_visible_annotations_length,
3886 const u1* const runtime_invisible_annotations,
3887 int runtime_invisible_annotations_length,
3888 TRAPS) {
3889 AnnotationArray* annotations = NULL;
3890 if (runtime_visible_annotations != NULL ||
3891 runtime_invisible_annotations != NULL) {
3892 annotations = MetadataFactory::new_array<u1>(_loader_data,
3893 runtime_visible_annotations_length +
3894 runtime_invisible_annotations_length,
3895 CHECK_(annotations));
3896 if (runtime_visible_annotations != NULL) {
3897 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3898 annotations->at_put(i, runtime_visible_annotations[i]);
3899 }
3900 }
3901 if (runtime_invisible_annotations != NULL) {
3902 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3903 int append = runtime_visible_annotations_length+i;
3904 annotations->at_put(append, runtime_invisible_annotations[i]);
3905 }
3906 }
3907 }
3908 return annotations;
3909 }
3910
3911 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3912 const int super_class_index,
3913 const bool need_verify,
3914 TRAPS) {
3915 assert(cp != NULL, "invariant");
3916 const InstanceKlass* super_klass = NULL;
3917
3918 if (super_class_index == 0) {
3919 check_property(_class_name == vmSymbols::java_lang_Object(),
3920 "Invalid superclass index %u in class file %s",
3921 super_class_index,
3922 CHECK_NULL);
3923 } else {
3924 check_property(valid_klass_reference_at(super_class_index),
3925 "Invalid superclass index %u in class file %s",
3926 super_class_index,
3927 CHECK_NULL);
3928 // The class name should be legal because it is checked when parsing constant pool.
3929 // However, make sure it is not an array type.
3930 bool is_array = false;
3931 if (cp->tag_at(super_class_index).is_klass()) {
3932 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3933 if (need_verify)
3934 is_array = super_klass->is_array_klass();
3935 } else if (need_verify) {
3936 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3937 }
3938 if (need_verify) {
3939 guarantee_property(!is_array,
3940 "Bad superclass name in class file %s", CHECK_NULL);
3941 }
3942 }
3943 return super_klass;
3944 }
3945
3946 static unsigned int compute_oop_map_count(const InstanceKlass* super,
3947 unsigned int nonstatic_oop_map_count,
3948 int first_nonstatic_oop_offset) {
3949
3950 unsigned int map_count =
3951 NULL == super ? 0 : super->nonstatic_oop_map_count();
3952 if (nonstatic_oop_map_count > 0) {
3953 // We have oops to add to map
3954 if (map_count == 0) {
3955 map_count = nonstatic_oop_map_count;
3956 }
3957 else {
3958 // Check whether we should add a new map block or whether the last one can
3959 // be extended
3960 const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3961 const OopMapBlock* const last_map = first_map + map_count - 1;
3962
3963 const int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3964 if (next_offset == first_nonstatic_oop_offset) {
3965 // There is no gap bettwen superklass's last oop field and first
3966 // local oop field, merge maps.
3967 nonstatic_oop_map_count -= 1;
3968 }
3969 else {
3970 // Superklass didn't end with a oop field, add extra maps
3971 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3972 }
3973 map_count += nonstatic_oop_map_count;
3974 }
3975 }
3976 return map_count;
3977 }
3978
3979 #ifndef PRODUCT
3980 static void print_field_layout(const Symbol* name,
3981 Array<u2>* fields,
3982 ConstantPool* cp,
3983 int instance_size,
3984 int instance_fields_start,
3985 int instance_fields_end,
3986 int static_fields_end) {
3987
3988 assert(name != NULL, "invariant");
3989
3990 tty->print("%s: field layout\n", name->as_klass_external_name());
3991 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3992 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3993 if (!fs.access_flags().is_static()) {
3994 tty->print(" @%3d \"%s\" %s\n",
3995 fs.offset(),
3996 fs.name()->as_klass_external_name(),
3997 fs.signature()->as_klass_external_name());
3998 }
3999 }
4000 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4001 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4002 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4003 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4004 if (fs.access_flags().is_static()) {
4005 tty->print(" @%3d \"%s\" %s\n",
4006 fs.offset(),
4007 fs.name()->as_klass_external_name(),
4008 fs.signature()->as_klass_external_name());
4009 }
4010 }
4011 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4012 tty->print("\n");
4013 }
4014 #endif
4015
4016 // Values needed for oopmap and InstanceKlass creation
4017 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
4018 public:
4019 int* nonstatic_oop_offsets;
4020 unsigned int* nonstatic_oop_counts;
4021 unsigned int nonstatic_oop_map_count;
4022 unsigned int total_oop_map_count;
4023 int instance_size;
4024 int nonstatic_field_size;
4025 int static_field_size;
4026 bool has_nonstatic_fields;
4027 };
4028
4029 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
4030 void ClassFileParser::layout_fields(ConstantPool* cp,
4031 const FieldAllocationCount* fac,
4032 const ClassAnnotationCollector* parsed_annotations,
4033 FieldLayoutInfo* info,
4034 TRAPS) {
4035
4036 assert(cp != NULL, "invariant");
4037
4038 // Field size and offset computation
4039 int nonstatic_field_size = _super_klass == NULL ? 0 :
4040 _super_klass->nonstatic_field_size();
4041
4042 // Count the contended fields by type.
4043 //
4044 // We ignore static fields, because @Contended is not supported for them.
4045 // The layout code below will also ignore the static fields.
4046 int nonstatic_contended_count = 0;
4047 FieldAllocationCount fac_contended;
4048 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4049 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4050 if (fs.is_contended()) {
4051 fac_contended.count[atype]++;
4052 if (!fs.access_flags().is_static()) {
4053 nonstatic_contended_count++;
4054 }
4055 }
4056 }
4057
4058
4059 // Calculate the starting byte offsets
4060 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
4061 int next_static_double_offset = next_static_oop_offset +
4062 ((fac->count[STATIC_OOP]) * heapOopSize);
4063 if (fac->count[STATIC_DOUBLE]) {
4064 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
4065 }
4066
4067 int next_static_word_offset = next_static_double_offset +
4068 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
4069 int next_static_short_offset = next_static_word_offset +
4070 ((fac->count[STATIC_WORD]) * BytesPerInt);
4071 int next_static_byte_offset = next_static_short_offset +
4072 ((fac->count[STATIC_SHORT]) * BytesPerShort);
4073
4074 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
4075 nonstatic_field_size * heapOopSize;
4076
4077 int next_nonstatic_field_offset = nonstatic_fields_start;
4078
4079 const bool is_contended_class = parsed_annotations->is_contended();
4080
4081 // Class is contended, pad before all the fields
4082 if (is_contended_class) {
4083 next_nonstatic_field_offset += ContendedPaddingWidth;
4084 }
4085
4086 // Compute the non-contended fields count.
4087 // The packing code below relies on these counts to determine if some field
4088 // can be squeezed into the alignment gap. Contended fields are obviously
4089 // exempt from that.
4090 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
4091 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
4092 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
4093 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
4094 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
4095
4096 // Total non-static fields count, including every contended field
4097 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
4098 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
4099 fac->count[NONSTATIC_OOP];
4100
4101 const bool super_has_nonstatic_fields =
4102 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
4103 const bool has_nonstatic_fields =
4104 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
4105
4106
4107 // Prepare list of oops for oop map generation.
4108 //
4109 // "offset" and "count" lists are describing the set of contiguous oop
4110 // regions. offset[i] is the start of the i-th region, which then has
4111 // count[i] oops following. Before we know how many regions are required,
4112 // we pessimistically allocate the maps to fit all the oops into the
4113 // distinct regions.
4114 //
4115 // TODO: We add +1 to always allocate non-zero resource arrays; we need
4116 // to figure out if we still need to do this.
4117 unsigned int nonstatic_oop_map_count = 0;
4118 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
4119
4120 int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
4121 THREAD, int, max_nonstatic_oop_maps);
4122 unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
4123 THREAD, unsigned int, max_nonstatic_oop_maps);
4124
4125 int first_nonstatic_oop_offset = 0; // will be set for first oop field
4126
4127 bool compact_fields = CompactFields;
4128 int allocation_style = FieldsAllocationStyle;
4129 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
4130 assert(false, "0 <= FieldsAllocationStyle <= 2");
4131 allocation_style = 1; // Optimistic
4132 }
4133
4134 // The next classes have predefined hard-coded fields offsets
4135 // (see in JavaClasses::compute_hard_coded_offsets()).
4136 // Use default fields allocation order for them.
4137 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
4138 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
4139 _class_name == vmSymbols::java_lang_Class() ||
4140 _class_name == vmSymbols::java_lang_ClassLoader() ||
4141 _class_name == vmSymbols::java_lang_ref_Reference() ||
4142 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
4143 _class_name == vmSymbols::java_lang_StackTraceElement() ||
4144 _class_name == vmSymbols::java_lang_String() ||
4145 _class_name == vmSymbols::java_lang_Throwable() ||
4146 _class_name == vmSymbols::java_lang_Boolean() ||
4147 _class_name == vmSymbols::java_lang_Character() ||
4148 _class_name == vmSymbols::java_lang_Float() ||
4149 _class_name == vmSymbols::java_lang_Double() ||
4150 _class_name == vmSymbols::java_lang_Byte() ||
4151 _class_name == vmSymbols::java_lang_Short() ||
4152 _class_name == vmSymbols::java_lang_Integer() ||
4153 _class_name == vmSymbols::java_lang_Long())) {
4154 allocation_style = 0; // Allocate oops first
4155 compact_fields = false; // Don't compact fields
4156 }
4157
4158 int next_nonstatic_oop_offset = 0;
4159 int next_nonstatic_double_offset = 0;
4160
4161 // Rearrange fields for a given allocation style
4162 if( allocation_style == 0 ) {
4163 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
4164 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4165 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4166 (nonstatic_oop_count * heapOopSize);
4167 } else if( allocation_style == 1 ) {
4168 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
4169 next_nonstatic_double_offset = next_nonstatic_field_offset;
4170 } else if( allocation_style == 2 ) {
4171 // Fields allocation: oops fields in super and sub classes are together.
4172 if( nonstatic_field_size > 0 && _super_klass != NULL &&
4173 _super_klass->nonstatic_oop_map_size() > 0 ) {
4174 const unsigned int map_count = _super_klass->nonstatic_oop_map_count();
4175 const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps();
4176 const OopMapBlock* const last_map = first_map + map_count - 1;
4177 const int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
4178 if (next_offset == next_nonstatic_field_offset) {
4179 allocation_style = 0; // allocate oops first
4180 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4181 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4182 (nonstatic_oop_count * heapOopSize);
4183 }
4184 }
4185 if( allocation_style == 2 ) {
4186 allocation_style = 1; // allocate oops last
4187 next_nonstatic_double_offset = next_nonstatic_field_offset;
4188 }
4189 } else {
4190 ShouldNotReachHere();
4191 }
4192
4193 int nonstatic_oop_space_count = 0;
4194 int nonstatic_word_space_count = 0;
4195 int nonstatic_short_space_count = 0;
4196 int nonstatic_byte_space_count = 0;
4197 int nonstatic_oop_space_offset = 0;
4198 int nonstatic_word_space_offset = 0;
4199 int nonstatic_short_space_offset = 0;
4200 int nonstatic_byte_space_offset = 0;
4201
4202 // Try to squeeze some of the fields into the gaps due to
4203 // long/double alignment.
4204 if (nonstatic_double_count > 0) {
4205 int offset = next_nonstatic_double_offset;
4206 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
4207 if (compact_fields && offset != next_nonstatic_double_offset) {
4208 // Allocate available fields into the gap before double field.
4209 int length = next_nonstatic_double_offset - offset;
4210 assert(length == BytesPerInt, "");
4211 nonstatic_word_space_offset = offset;
4212 if (nonstatic_word_count > 0) {
4213 nonstatic_word_count -= 1;
4214 nonstatic_word_space_count = 1; // Only one will fit
4215 length -= BytesPerInt;
4216 offset += BytesPerInt;
4217 }
4218 nonstatic_short_space_offset = offset;
4219 while (length >= BytesPerShort && nonstatic_short_count > 0) {
4220 nonstatic_short_count -= 1;
4221 nonstatic_short_space_count += 1;
4222 length -= BytesPerShort;
4223 offset += BytesPerShort;
4224 }
4225 nonstatic_byte_space_offset = offset;
4226 while (length > 0 && nonstatic_byte_count > 0) {
4227 nonstatic_byte_count -= 1;
4228 nonstatic_byte_space_count += 1;
4229 length -= 1;
4230 }
4231 // Allocate oop field in the gap if there are no other fields for that.
4232 nonstatic_oop_space_offset = offset;
4233 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
4234 allocation_style != 0) { // when oop fields not first
4235 nonstatic_oop_count -= 1;
4236 nonstatic_oop_space_count = 1; // Only one will fit
4237 length -= heapOopSize;
4238 offset += heapOopSize;
4239 }
4240 }
4241 }
4242
4243 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4244 (nonstatic_double_count * BytesPerLong);
4245 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4246 (nonstatic_word_count * BytesPerInt);
4247 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4248 (nonstatic_short_count * BytesPerShort);
4249 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4250 nonstatic_byte_count;
4251
4252 // let oops jump before padding with this allocation style
4253 if( allocation_style == 1 ) {
4254 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4255 if( nonstatic_oop_count > 0 ) {
4256 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4257 }
4258 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4259 }
4260
4261 // Iterate over fields again and compute correct offsets.
4262 // The field allocation type was temporarily stored in the offset slot.
4263 // oop fields are located before non-oop fields (static and non-static).
4264 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4265
4266 // skip already laid out fields
4267 if (fs.is_offset_set()) continue;
4268
4269 // contended instance fields are handled below
4270 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4271
4272 int real_offset = 0;
4273 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4274
4275 // pack the rest of the fields
4276 switch (atype) {
4277 case STATIC_OOP:
4278 real_offset = next_static_oop_offset;
4279 next_static_oop_offset += heapOopSize;
4280 break;
4281 case STATIC_BYTE:
4282 real_offset = next_static_byte_offset;
4283 next_static_byte_offset += 1;
4284 break;
4285 case STATIC_SHORT:
4286 real_offset = next_static_short_offset;
4287 next_static_short_offset += BytesPerShort;
4288 break;
4289 case STATIC_WORD:
4290 real_offset = next_static_word_offset;
4291 next_static_word_offset += BytesPerInt;
4292 break;
4293 case STATIC_DOUBLE:
4294 real_offset = next_static_double_offset;
4295 next_static_double_offset += BytesPerLong;
4296 break;
4297 case NONSTATIC_OOP:
4298 if( nonstatic_oop_space_count > 0 ) {
4299 real_offset = nonstatic_oop_space_offset;
4300 nonstatic_oop_space_offset += heapOopSize;
4301 nonstatic_oop_space_count -= 1;
4302 } else {
4303 real_offset = next_nonstatic_oop_offset;
4304 next_nonstatic_oop_offset += heapOopSize;
4305 }
4306
4307 // Record this oop in the oop maps
4308 if( nonstatic_oop_map_count > 0 &&
4309 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4310 real_offset -
4311 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4312 heapOopSize ) {
4313 // This oop is adjacent to the previous one, add to current oop map
4314 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4315 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4316 } else {
4317 // This oop is not adjacent to the previous one, create new oop map
4318 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4319 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4320 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4321 nonstatic_oop_map_count += 1;
4322 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4323 first_nonstatic_oop_offset = real_offset;
4324 }
4325 }
4326 break;
4327 case NONSTATIC_BYTE:
4328 if( nonstatic_byte_space_count > 0 ) {
4329 real_offset = nonstatic_byte_space_offset;
4330 nonstatic_byte_space_offset += 1;
4331 nonstatic_byte_space_count -= 1;
4332 } else {
4333 real_offset = next_nonstatic_byte_offset;
4334 next_nonstatic_byte_offset += 1;
4335 }
4336 break;
4337 case NONSTATIC_SHORT:
4338 if( nonstatic_short_space_count > 0 ) {
4339 real_offset = nonstatic_short_space_offset;
4340 nonstatic_short_space_offset += BytesPerShort;
4341 nonstatic_short_space_count -= 1;
4342 } else {
4343 real_offset = next_nonstatic_short_offset;
4344 next_nonstatic_short_offset += BytesPerShort;
4345 }
4346 break;
4347 case NONSTATIC_WORD:
4348 if( nonstatic_word_space_count > 0 ) {
4349 real_offset = nonstatic_word_space_offset;
4350 nonstatic_word_space_offset += BytesPerInt;
4351 nonstatic_word_space_count -= 1;
4352 } else {
4353 real_offset = next_nonstatic_word_offset;
4354 next_nonstatic_word_offset += BytesPerInt;
4355 }
4356 break;
4357 case NONSTATIC_DOUBLE:
4358 real_offset = next_nonstatic_double_offset;
4359 next_nonstatic_double_offset += BytesPerLong;
4360 break;
4361 default:
4362 ShouldNotReachHere();
4363 }
4364 fs.set_offset(real_offset);
4365 }
4366
4367
4368 // Handle the contended cases.
4369 //
4370 // Each contended field should not intersect the cache line with another contended field.
4371 // In the absence of alignment information, we end up with pessimistically separating
4372 // the fields with full-width padding.
4373 //
4374 // Additionally, this should not break alignment for the fields, so we round the alignment up
4375 // for each field.
4376 if (nonstatic_contended_count > 0) {
4377
4378 // if there is at least one contended field, we need to have pre-padding for them
4379 next_nonstatic_padded_offset += ContendedPaddingWidth;
4380
4381 // collect all contended groups
4382 ResourceBitMap bm(cp->size());
4383 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4384 // skip already laid out fields
4385 if (fs.is_offset_set()) continue;
4386
4387 if (fs.is_contended()) {
4388 bm.set_bit(fs.contended_group());
4389 }
4390 }
4391
4392 int current_group = -1;
4393 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4394
4395 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4396
4397 // skip already laid out fields
4398 if (fs.is_offset_set()) continue;
4399
4400 // skip non-contended fields and fields from different group
4401 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4402
4403 // handle statics below
4404 if (fs.access_flags().is_static()) continue;
4405
4406 int real_offset = 0;
4407 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4408
4409 switch (atype) {
4410 case NONSTATIC_BYTE:
4411 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4412 real_offset = next_nonstatic_padded_offset;
4413 next_nonstatic_padded_offset += 1;
4414 break;
4415
4416 case NONSTATIC_SHORT:
4417 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4418 real_offset = next_nonstatic_padded_offset;
4419 next_nonstatic_padded_offset += BytesPerShort;
4420 break;
4421
4422 case NONSTATIC_WORD:
4423 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4424 real_offset = next_nonstatic_padded_offset;
4425 next_nonstatic_padded_offset += BytesPerInt;
4426 break;
4427
4428 case NONSTATIC_DOUBLE:
4429 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4430 real_offset = next_nonstatic_padded_offset;
4431 next_nonstatic_padded_offset += BytesPerLong;
4432 break;
4433
4434 case NONSTATIC_OOP:
4435 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4436 real_offset = next_nonstatic_padded_offset;
4437 next_nonstatic_padded_offset += heapOopSize;
4438
4439 // Record this oop in the oop maps
4440 if( nonstatic_oop_map_count > 0 &&
4441 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4442 real_offset -
4443 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4444 heapOopSize ) {
4445 // This oop is adjacent to the previous one, add to current oop map
4446 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4447 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4448 } else {
4449 // This oop is not adjacent to the previous one, create new oop map
4450 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4451 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4452 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4453 nonstatic_oop_map_count += 1;
4454 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4455 first_nonstatic_oop_offset = real_offset;
4456 }
4457 }
4458 break;
4459
4460 default:
4461 ShouldNotReachHere();
4462 }
4463
4464 if (fs.contended_group() == 0) {
4465 // Contended group defines the equivalence class over the fields:
4466 // the fields within the same contended group are not inter-padded.
4467 // The only exception is default group, which does not incur the
4468 // equivalence, and so requires intra-padding.
4469 next_nonstatic_padded_offset += ContendedPaddingWidth;
4470 }
4471
4472 fs.set_offset(real_offset);
4473 } // for
4474
4475 // Start laying out the next group.
4476 // Note that this will effectively pad the last group in the back;
4477 // this is expected to alleviate memory contention effects for
4478 // subclass fields and/or adjacent object.
4479 // If this was the default group, the padding is already in place.
4480 if (current_group != 0) {
4481 next_nonstatic_padded_offset += ContendedPaddingWidth;
4482 }
4483 }
4484
4485 // handle static fields
4486 }
4487
4488 // Entire class is contended, pad in the back.
4489 // This helps to alleviate memory contention effects for subclass fields
4490 // and/or adjacent object.
4491 if (is_contended_class) {
4492 next_nonstatic_padded_offset += ContendedPaddingWidth;
4493 }
4494
4495 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4496
4497 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize);
4498 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4499 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4500
4501 int static_field_size = (static_fields_end -
4502 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4503 nonstatic_field_size = nonstatic_field_size +
4504 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4505
4506 int instance_size = align_object_size(instance_end / wordSize);
4507
4508 assert(instance_size == align_object_size(align_up(
4509 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
4510 wordSize) / wordSize), "consistent layout helper value");
4511
4512 // Invariant: nonstatic_field end/start should only change if there are
4513 // nonstatic fields in the class, or if the class is contended. We compare
4514 // against the non-aligned value, so that end alignment will not fail the
4515 // assert without actually having the fields.
4516 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4517 is_contended_class ||
4518 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4519
4520 // Number of non-static oop map blocks allocated at end of klass.
4521 const unsigned int total_oop_map_count =
4522 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
4523 first_nonstatic_oop_offset);
4524
4525 #ifndef PRODUCT
4526 if (PrintFieldLayout) {
4527 print_field_layout(_class_name,
4528 _fields,
4529 cp,
4530 instance_size,
4531 nonstatic_fields_start,
4532 nonstatic_fields_end,
4533 static_fields_end);
4534 }
4535
4536 #endif
4537 // Pass back information needed for InstanceKlass creation
4538 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
4539 info->nonstatic_oop_counts = nonstatic_oop_counts;
4540 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
4541 info->total_oop_map_count = total_oop_map_count;
4542 info->instance_size = instance_size;
4543 info->static_field_size = static_field_size;
4544 info->nonstatic_field_size = nonstatic_field_size;
4545 info->has_nonstatic_fields = has_nonstatic_fields;
4546 }
4547
4548 static void fill_oop_maps(const InstanceKlass* k,
4549 unsigned int nonstatic_oop_map_count,
4550 const int* nonstatic_oop_offsets,
4551 const unsigned int* nonstatic_oop_counts) {
4552
4553 assert(k != NULL, "invariant");
4554
4555 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4556 const InstanceKlass* const super = k->superklass();
4557 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4558 if (super_count > 0) {
4559 // Copy maps from superklass
4560 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4561 for (unsigned int i = 0; i < super_count; ++i) {
4562 *this_oop_map++ = *super_oop_map++;
4563 }
4564 }
4565
4566 if (nonstatic_oop_map_count > 0) {
4567 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4568 // The counts differ because there is no gap between superklass's last oop
4569 // field and the first local oop field. Extend the last oop map copied
4570 // from the superklass instead of creating new one.
4571 nonstatic_oop_map_count--;
4572 nonstatic_oop_offsets++;
4573 this_oop_map--;
4574 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4575 this_oop_map++;
4576 }
4577
4578 // Add new map blocks, fill them
4579 while (nonstatic_oop_map_count-- > 0) {
4580 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4581 this_oop_map->set_count(*nonstatic_oop_counts++);
4582 this_oop_map++;
4583 }
4584 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4585 this_oop_map, "sanity");
4586 }
4587 }
4588
4589
4590 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4591 assert(ik != NULL, "invariant");
4592
4593 const Klass* const super = ik->super();
4594
4595 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4596 // in which case we don't have to register objects as finalizable
4597 if (!_has_empty_finalizer) {
4598 if (_has_finalizer ||
4599 (super != NULL && super->has_finalizer())) {
4600 ik->set_has_finalizer();
4601 }
4602 }
4603
4604 #ifdef ASSERT
4605 bool f = false;
4606 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4607 vmSymbols::void_method_signature());
4608 if (m != NULL && !m->is_empty_method()) {
4609 f = true;
4610 }
4611
4612 // Spec doesn't prevent agent from redefinition of empty finalizer.
4613 // Despite the fact that it's generally bad idea and redefined finalizer
4614 // will not work as expected we shouldn't abort vm in this case
4615 if (!ik->has_redefined_this_or_super()) {
4616 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4617 }
4618 #endif
4619
4620 // Check if this klass supports the java.lang.Cloneable interface
4621 if (SystemDictionary::Cloneable_klass_loaded()) {
4622 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4623 ik->set_is_cloneable();
4624 }
4625 }
4626
4627 // Check if this klass has a vanilla default constructor
4628 if (super == NULL) {
4629 // java.lang.Object has empty default constructor
4630 ik->set_has_vanilla_constructor();
4631 } else {
4632 if (super->has_vanilla_constructor() &&
4633 _has_vanilla_constructor) {
4634 ik->set_has_vanilla_constructor();
4635 }
4636 #ifdef ASSERT
4637 bool v = false;
4638 if (super->has_vanilla_constructor()) {
4639 const Method* const constructor =
4640 ik->find_method(vmSymbols::object_initializer_name(),
4641 vmSymbols::void_method_signature());
4642 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4643 v = true;
4644 }
4645 }
4646 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4647 #endif
4648 }
4649
4650 // If it cannot be fast-path allocated, set a bit in the layout helper.
4651 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4652 assert(ik->size_helper() > 0, "layout_helper is initialized");
4653 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4654 || ik->is_abstract() || ik->is_interface()
4655 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4656 || ik->size_helper() >= FastAllocateSizeLimit) {
4657 // Forbid fast-path allocation.
4658 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4659 ik->set_layout_helper(lh);
4660 }
4661 }
4662
4663 // utility methods for appending an array with check for duplicates
4664
4665 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4666 const Array<InstanceKlass*>* const ifs) {
4667 // iterate over new interfaces
4668 for (int i = 0; i < ifs->length(); i++) {
4669 InstanceKlass* const e = ifs->at(i);
4670 assert(e->is_klass() && e->is_interface(), "just checking");
4671 // add new interface
4672 result->append_if_missing(e);
4673 }
4674 }
4675
4676 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4677 Array<InstanceKlass*>* local_ifs,
4678 ClassLoaderData* loader_data,
4679 TRAPS) {
4680 assert(local_ifs != NULL, "invariant");
4681 assert(loader_data != NULL, "invariant");
4682
4683 // Compute maximum size for transitive interfaces
4684 int max_transitive_size = 0;
4685 int super_size = 0;
4686 // Add superclass transitive interfaces size
4687 if (super != NULL) {
4688 super_size = super->transitive_interfaces()->length();
4689 max_transitive_size += super_size;
4690 }
4691 // Add local interfaces' super interfaces
4692 const int local_size = local_ifs->length();
4693 for (int i = 0; i < local_size; i++) {
4694 InstanceKlass* const l = local_ifs->at(i);
4695 max_transitive_size += l->transitive_interfaces()->length();
4696 }
4697 // Finally add local interfaces
4698 max_transitive_size += local_size;
4699 // Construct array
4700 if (max_transitive_size == 0) {
4701 // no interfaces, use canonicalized array
4702 return Universe::the_empty_instance_klass_array();
4703 } else if (max_transitive_size == super_size) {
4704 // no new local interfaces added, share superklass' transitive interface array
4705 return super->transitive_interfaces();
4706 } else if (max_transitive_size == local_size) {
4707 // only local interfaces added, share local interface array
4708 return local_ifs;
4709 } else {
4710 ResourceMark rm;
4711 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4712
4713 // Copy down from superclass
4714 if (super != NULL) {
4715 append_interfaces(result, super->transitive_interfaces());
4716 }
4717
4718 // Copy down from local interfaces' superinterfaces
4719 for (int i = 0; i < local_size; i++) {
4720 InstanceKlass* const l = local_ifs->at(i);
4721 append_interfaces(result, l->transitive_interfaces());
4722 }
4723 // Finally add local interfaces
4724 append_interfaces(result, local_ifs);
4725
4726 // length will be less than the max_transitive_size if duplicates were removed
4727 const int length = result->length();
4728 assert(length <= max_transitive_size, "just checking");
4729 Array<InstanceKlass*>* const new_result =
4730 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4731 for (int i = 0; i < length; i++) {
4732 InstanceKlass* const e = result->at(i);
4733 assert(e != NULL, "just checking");
4734 new_result->at_put(i, e);
4735 }
4736 return new_result;
4737 }
4738 }
4739
4740 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4741 assert(this_klass != NULL, "invariant");
4742 const Klass* const super = this_klass->super();
4743
4744 if (super != NULL) {
4745
4746 // If the loader is not the boot loader then throw an exception if its
4747 // superclass is in package jdk.internal.reflect and its loader is not a
4748 // special reflection class loader
4749 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4750 assert(super->is_instance_klass(), "super is not instance klass");
4751 PackageEntry* super_package = super->package();
4752 if (super_package != NULL &&
4753 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4754 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4755 ResourceMark rm(THREAD);
4756 Exceptions::fthrow(
4757 THREAD_AND_LOCATION,
4758 vmSymbols::java_lang_IllegalAccessError(),
4759 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4760 this_klass->external_name(),
4761 this_klass->class_loader_data()->loader_name_and_id(),
4762 super->external_name());
4763 return;
4764 }
4765 }
4766
4767 Reflection::VerifyClassAccessResults vca_result =
4768 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4769 if (vca_result != Reflection::ACCESS_OK) {
4770 ResourceMark rm(THREAD);
4771 char* msg = Reflection::verify_class_access_msg(this_klass,
4772 InstanceKlass::cast(super),
4773 vca_result);
4774 if (msg == NULL) {
4775 bool same_module = (this_klass->module() == super->module());
4776 Exceptions::fthrow(
4777 THREAD_AND_LOCATION,
4778 vmSymbols::java_lang_IllegalAccessError(),
4779 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4780 this_klass->external_name(),
4781 super->is_abstract() ? "abstract " : "",
4782 super->external_name(),
4783 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4784 (same_module) ? "" : "; ",
4785 (same_module) ? "" : super->class_in_module_of_loader());
4786 } else {
4787 // Add additional message content.
4788 Exceptions::fthrow(
4789 THREAD_AND_LOCATION,
4790 vmSymbols::java_lang_IllegalAccessError(),
4791 "superclass access check failed: %s",
4792 msg);
4793 }
4794 }
4795 }
4796 }
4797
4798
4799 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4800 assert(this_klass != NULL, "invariant");
4801 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4802 const int lng = local_interfaces->length();
4803 for (int i = lng - 1; i >= 0; i--) {
4804 InstanceKlass* const k = local_interfaces->at(i);
4805 assert (k != NULL && k->is_interface(), "invalid interface");
4806 Reflection::VerifyClassAccessResults vca_result =
4807 Reflection::verify_class_access(this_klass, k, false);
4808 if (vca_result != Reflection::ACCESS_OK) {
4809 ResourceMark rm(THREAD);
4810 char* msg = Reflection::verify_class_access_msg(this_klass,
4811 k,
4812 vca_result);
4813 if (msg == NULL) {
4814 bool same_module = (this_klass->module() == k->module());
4815 Exceptions::fthrow(
4816 THREAD_AND_LOCATION,
4817 vmSymbols::java_lang_IllegalAccessError(),
4818 "class %s cannot access its superinterface %s (%s%s%s)",
4819 this_klass->external_name(),
4820 k->external_name(),
4821 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4822 (same_module) ? "" : "; ",
4823 (same_module) ? "" : k->class_in_module_of_loader());
4824 } else {
4825 // Add additional message content.
4826 Exceptions::fthrow(
4827 THREAD_AND_LOCATION,
4828 vmSymbols::java_lang_IllegalAccessError(),
4829 "superinterface check failed: %s",
4830 msg);
4831 }
4832 }
4833 }
4834 }
4835
4836
4837 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4838 assert(this_klass != NULL, "invariant");
4839 const Array<Method*>* const methods = this_klass->methods();
4840 const int num_methods = methods->length();
4841
4842 // go thru each method and check if it overrides a final method
4843 for (int index = 0; index < num_methods; index++) {
4844 const Method* const m = methods->at(index);
4845
4846 // skip private, static, and <init> methods
4847 if ((!m->is_private() && !m->is_static()) &&
4848 (m->name() != vmSymbols::object_initializer_name())) {
4849
4850 const Symbol* const name = m->name();
4851 const Symbol* const signature = m->signature();
4852 const Klass* k = this_klass->super();
4853 const Method* super_m = NULL;
4854 while (k != NULL) {
4855 // skip supers that don't have final methods.
4856 if (k->has_final_method()) {
4857 // lookup a matching method in the super class hierarchy
4858 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4859 if (super_m == NULL) {
4860 break; // didn't find any match; get out
4861 }
4862
4863 if (super_m->is_final() && !super_m->is_static() &&
4864 !super_m->access_flags().is_private()) {
4865 // matching method in super is final, and not static or private
4866 bool can_access = Reflection::verify_member_access(this_klass,
4867 super_m->method_holder(),
4868 super_m->method_holder(),
4869 super_m->access_flags(),
4870 false, false, CHECK);
4871 if (can_access) {
4872 // this class can access super final method and therefore override
4873 ResourceMark rm(THREAD);
4874 Exceptions::fthrow(THREAD_AND_LOCATION,
4875 vmSymbols::java_lang_VerifyError(),
4876 "class %s overrides final method %s.%s%s",
4877 this_klass->external_name(),
4878 super_m->method_holder()->external_name(),
4879 name->as_C_string(),
4880 signature->as_C_string()
4881 );
4882 return;
4883 }
4884 }
4885
4886 // continue to look from super_m's holder's super.
4887 k = super_m->method_holder()->super();
4888 continue;
4889 }
4890
4891 k = k->super();
4892 }
4893 }
4894 }
4895 }
4896
4897
4898 // assumes that this_klass is an interface
4899 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4900 assert(this_klass != NULL, "invariant");
4901 assert(this_klass->is_interface(), "not an interface");
4902 const Array<Method*>* methods = this_klass->methods();
4903 const int num_methods = methods->length();
4904
4905 for (int index = 0; index < num_methods; index++) {
4906 const Method* const m = methods->at(index);
4907 // if m is static and not the init method, throw a verify error
4908 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4909 ResourceMark rm(THREAD);
4910 Exceptions::fthrow(
4911 THREAD_AND_LOCATION,
4912 vmSymbols::java_lang_VerifyError(),
4913 "Illegal static method %s in interface %s",
4914 m->name()->as_C_string(),
4915 this_klass->external_name()
4916 );
4917 return;
4918 }
4919 }
4920 }
4921
4922 // utility methods for format checking
4923
4924 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4925 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4926 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4927 if (is_module) {
4928 ResourceMark rm(THREAD);
4929 Exceptions::fthrow(
4930 THREAD_AND_LOCATION,
4931 vmSymbols::java_lang_NoClassDefFoundError(),
4932 "%s is not a class because access_flag ACC_MODULE is set",
4933 _class_name->as_C_string());
4934 return;
4935 }
4936
4937 if (!_need_verify) { return; }
4938
4939 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4940 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4941 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4942 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4943 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4944 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4945 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4946 const bool major_gte_14 = _major_version >= JAVA_14_VERSION;
4947
4948 if ((is_abstract && is_final) ||
4949 (is_interface && !is_abstract) ||
4950 (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
4951 (!is_interface && major_gte_1_5 && is_annotation)) {
4952 ResourceMark rm(THREAD);
4953 Exceptions::fthrow(
4954 THREAD_AND_LOCATION,
4955 vmSymbols::java_lang_ClassFormatError(),
4956 "Illegal class modifiers in class %s: 0x%X",
4957 _class_name->as_C_string(), flags
4958 );
4959 return;
4960 }
4961 }
4962
4963 static bool has_illegal_visibility(jint flags) {
4964 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4965 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4966 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4967
4968 return ((is_public && is_protected) ||
4969 (is_public && is_private) ||
4970 (is_protected && is_private));
4971 }
4972
4973 // A legal major_version.minor_version must be one of the following:
4974 //
4975 // Major_version >= 45 and major_version < 56, any minor_version.
4976 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4977 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4978 //
4979 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4980 ResourceMark rm(THREAD);
4981 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4982 if (major < JAVA_MIN_SUPPORTED_VERSION) {
4983 Exceptions::fthrow(
4984 THREAD_AND_LOCATION,
4985 vmSymbols::java_lang_UnsupportedClassVersionError(),
4986 "%s (class file version %u.%u) was compiled with an invalid major version",
4987 class_name->as_C_string(), major, minor);
4988 return;
4989 }
4990
4991 if (major > max_version) {
4992 Exceptions::fthrow(
4993 THREAD_AND_LOCATION,
4994 vmSymbols::java_lang_UnsupportedClassVersionError(),
4995 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4996 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4997 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4998 return;
4999 }
5000
5001 if (major < JAVA_12_VERSION || minor == 0) {
5002 return;
5003 }
5004
5005 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
5006 if (major != max_version) {
5007 Exceptions::fthrow(
5008 THREAD_AND_LOCATION,
5009 vmSymbols::java_lang_UnsupportedClassVersionError(),
5010 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
5011 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
5012 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
5013 return;
5014 }
5015
5016 if (!Arguments::enable_preview()) {
5017 Exceptions::fthrow(
5018 THREAD_AND_LOCATION,
5019 vmSymbols::java_lang_UnsupportedClassVersionError(),
5020 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
5021 class_name->as_C_string(), major, minor);
5022 return;
5023 }
5024
5025 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
5026 Exceptions::fthrow(
5027 THREAD_AND_LOCATION,
5028 vmSymbols::java_lang_UnsupportedClassVersionError(),
5029 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
5030 class_name->as_C_string(), major, minor);
5031 }
5032 }
5033
5034 void ClassFileParser::verify_legal_field_modifiers(jint flags,
5035 bool is_interface,
5036 TRAPS) const {
5037 if (!_need_verify) { return; }
5038
5039 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5040 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5041 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5042 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5043 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5044 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
5045 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
5046 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5047 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
5048
5049 bool is_illegal = false;
5050
5051 if (is_interface) {
5052 if (!is_public || !is_static || !is_final || is_private ||
5053 is_protected || is_volatile || is_transient ||
5054 (major_gte_1_5 && is_enum)) {
5055 is_illegal = true;
5056 }
5057 } else { // not interface
5058 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
5059 is_illegal = true;
5060 }
5061 }
5062
5063 if (is_illegal) {
5064 ResourceMark rm(THREAD);
5065 Exceptions::fthrow(
5066 THREAD_AND_LOCATION,
5067 vmSymbols::java_lang_ClassFormatError(),
5068 "Illegal field modifiers in class %s: 0x%X",
5069 _class_name->as_C_string(), flags);
5070 return;
5071 }
5072 }
5073
5074 void ClassFileParser::verify_legal_method_modifiers(jint flags,
5075 bool is_interface,
5076 const Symbol* name,
5077 TRAPS) const {
5078 if (!_need_verify) { return; }
5079
5080 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5081 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5082 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5083 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5084 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
5085 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5086 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
5087 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
5088 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
5089 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5090 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
5091 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
5092 const bool is_initializer = (name == vmSymbols::object_initializer_name());
5093
5094 bool is_illegal = false;
5095
5096 if (is_interface) {
5097 if (major_gte_8) {
5098 // Class file version is JAVA_8_VERSION or later Methods of
5099 // interfaces may set any of the flags except ACC_PROTECTED,
5100 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5101 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5102 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5103 (is_native || is_protected || is_final || is_synchronized) ||
5104 // If a specific method of a class or interface has its
5105 // ACC_ABSTRACT flag set, it must not have any of its
5106 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5107 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
5108 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5109 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5110 (is_abstract && (is_private || is_static || is_strict))) {
5111 is_illegal = true;
5112 }
5113 } else if (major_gte_1_5) {
5114 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5115 if (!is_public || is_private || is_protected || is_static || is_final ||
5116 is_synchronized || is_native || !is_abstract || is_strict) {
5117 is_illegal = true;
5118 }
5119 } else {
5120 // Class file version is pre-JAVA_1_5_VERSION
5121 if (!is_public || is_static || is_final || is_native || !is_abstract) {
5122 is_illegal = true;
5123 }
5124 }
5125 } else { // not interface
5126 if (has_illegal_visibility(flags)) {
5127 is_illegal = true;
5128 } else {
5129 if (is_initializer) {
5130 if (is_static || is_final || is_synchronized || is_native ||
5131 is_abstract || (major_gte_1_5 && is_bridge)) {
5132 is_illegal = true;
5133 }
5134 } else { // not initializer
5135 if (is_abstract) {
5136 if ((is_final || is_native || is_private || is_static ||
5137 (major_gte_1_5 && (is_synchronized || is_strict)))) {
5138 is_illegal = true;
5139 }
5140 }
5141 }
5142 }
5143 }
5144
5145 if (is_illegal) {
5146 ResourceMark rm(THREAD);
5147 Exceptions::fthrow(
5148 THREAD_AND_LOCATION,
5149 vmSymbols::java_lang_ClassFormatError(),
5150 "Method %s in class %s has illegal modifiers: 0x%X",
5151 name->as_C_string(), _class_name->as_C_string(), flags);
5152 return;
5153 }
5154 }
5155
5156 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5157 int length,
5158 TRAPS) const {
5159 assert(_need_verify, "only called when _need_verify is true");
5160 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5161 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5162 }
5163 }
5164
5165 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5166 // In class names, '/' separates unqualified names. This is verified in this function also.
5167 // Method names also may not contain the characters '<' or '>', unless <init>
5168 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5169 // method. Because these names have been checked as special cases before
5170 // calling this method in verify_legal_method_name.
5171 //
5172 // This method is also called from the modular system APIs in modules.cpp
5173 // to verify the validity of module and package names.
5174 bool ClassFileParser::verify_unqualified_name(const char* name,
5175 unsigned int length,
5176 int type) {
5177 if (length == 0) return false; // Must have at least one char.
5178 for (const char* p = name; p != name + length; p++) {
5179 switch(*p) {
5180 case JVM_SIGNATURE_DOT:
5181 case JVM_SIGNATURE_ENDCLASS:
5182 case JVM_SIGNATURE_ARRAY:
5183 // do not permit '.', ';', or '['
5184 return false;
5185 case JVM_SIGNATURE_SLASH:
5186 // check for '//' or leading or trailing '/' which are not legal
5187 // unqualified name must not be empty
5188 if (type == ClassFileParser::LegalClass) {
5189 if (p == name || p+1 >= name+length ||
5190 *(p+1) == JVM_SIGNATURE_SLASH) {
5191 return false;
5192 }
5193 } else {
5194 return false; // do not permit '/' unless it's class name
5195 }
5196 break;
5197 case JVM_SIGNATURE_SPECIAL:
5198 case JVM_SIGNATURE_ENDSPECIAL:
5199 // do not permit '<' or '>' in method names
5200 if (type == ClassFileParser::LegalMethod) {
5201 return false;
5202 }
5203 }
5204 }
5205 return true;
5206 }
5207
5208 // Take pointer to a UTF8 byte string (not NUL-terminated).
5209 // Skip over the longest part of the string that could
5210 // be taken as a fieldname. Allow '/' if slash_ok is true.
5211 // Return a pointer to just past the fieldname.
5212 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5213 // being true, we saw consecutive slashes (meaning we were looking for a
5214 // qualified path but found something that was badly-formed).
5215 static const char* skip_over_field_name(const char* const name,
5216 bool slash_ok,
5217 unsigned int length) {
5218 const char* p;
5219 jboolean last_is_slash = false;
5220 jboolean not_first_ch = false;
5221
5222 for (p = name; p != name + length; not_first_ch = true) {
5223 const char* old_p = p;
5224 jchar ch = *p;
5225 if (ch < 128) {
5226 p++;
5227 // quick check for ascii
5228 if ((ch >= 'a' && ch <= 'z') ||
5229 (ch >= 'A' && ch <= 'Z') ||
5230 (ch == '_' || ch == '$') ||
5231 (not_first_ch && ch >= '0' && ch <= '9')) {
5232 last_is_slash = false;
5233 continue;
5234 }
5235 if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
5236 if (last_is_slash) {
5237 return NULL; // Don't permit consecutive slashes
5238 }
5239 last_is_slash = true;
5240 continue;
5241 }
5242 }
5243 else {
5244 jint unicode_ch;
5245 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5246 p = tmp_p;
5247 last_is_slash = false;
5248 // Check if ch is Java identifier start or is Java identifier part
5249 // 4672820: call java.lang.Character methods directly without generating separate tables.
5250 EXCEPTION_MARK;
5251 // return value
5252 JavaValue result(T_BOOLEAN);
5253 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
5254 JavaCallArguments args;
5255 args.push_int(unicode_ch);
5256
5257 if (not_first_ch) {
5258 // public static boolean isJavaIdentifierPart(char ch);
5259 JavaCalls::call_static(&result,
5260 SystemDictionary::Character_klass(),
5261 vmSymbols::isJavaIdentifierPart_name(),
5262 vmSymbols::int_bool_signature(),
5263 &args,
5264 THREAD);
5265 } else {
5266 // public static boolean isJavaIdentifierStart(char ch);
5267 JavaCalls::call_static(&result,
5268 SystemDictionary::Character_klass(),
5269 vmSymbols::isJavaIdentifierStart_name(),
5270 vmSymbols::int_bool_signature(),
5271 &args,
5272 THREAD);
5273 }
5274 if (HAS_PENDING_EXCEPTION) {
5275 CLEAR_PENDING_EXCEPTION;
5276 return NULL;
5277 }
5278 if(result.get_jboolean()) {
5279 continue;
5280 }
5281 }
5282 return (not_first_ch) ? old_p : NULL;
5283 }
5284 return (not_first_ch) ? p : NULL;
5285 }
5286
5287 // Take pointer to a UTF8 byte string (not NUL-terminated).
5288 // Skip over the longest part of the string that could
5289 // be taken as a field signature. Allow "void" if void_ok.
5290 // Return a pointer to just past the signature.
5291 // Return NULL if no legal signature is found.
5292 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5293 bool void_ok,
5294 unsigned int length,
5295 TRAPS) const {
5296 unsigned int array_dim = 0;
5297 while (length > 0) {
5298 switch (signature[0]) {
5299 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5300 case JVM_SIGNATURE_BOOLEAN:
5301 case JVM_SIGNATURE_BYTE:
5302 case JVM_SIGNATURE_CHAR:
5303 case JVM_SIGNATURE_SHORT:
5304 case JVM_SIGNATURE_INT:
5305 case JVM_SIGNATURE_FLOAT:
5306 case JVM_SIGNATURE_LONG:
5307 case JVM_SIGNATURE_DOUBLE:
5308 return signature + 1;
5309 case JVM_SIGNATURE_CLASS: {
5310 if (_major_version < JAVA_1_5_VERSION) {
5311 // Skip over the class name if one is there
5312 const char* const p = skip_over_field_name(signature + 1, true, --length);
5313
5314 // The next character better be a semicolon
5315 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
5316 return p + 1;
5317 }
5318 }
5319 else {
5320 // Skip leading 'L' and ignore first appearance of ';'
5321 signature++;
5322 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
5323 // Format check signature
5324 if (c != NULL) {
5325 int newlen = c - (char*) signature;
5326 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5327 if (!legal) {
5328 classfile_parse_error("Class name is empty or contains illegal character "
5329 "in descriptor in class file %s",
5330 CHECK_0);
5331 return NULL;
5332 }
5333 return signature + newlen + 1;
5334 }
5335 }
5336 return NULL;
5337 }
5338 case JVM_SIGNATURE_ARRAY:
5339 array_dim++;
5340 if (array_dim > 255) {
5341 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5342 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5343 }
5344 // The rest of what's there better be a legal signature
5345 signature++;
5346 length--;
5347 void_ok = false;
5348 break;
5349 default:
5350 return NULL;
5351 }
5352 }
5353 return NULL;
5354 }
5355
5356 // Checks if name is a legal class name.
5357 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5358 if (!_need_verify || _relax_verify) { return; }
5359
5360 assert(name->refcount() > 0, "symbol must be kept alive");
5361 char* bytes = (char*)name->bytes();
5362 unsigned int length = name->utf8_length();
5363 bool legal = false;
5364
5365 if (length > 0) {
5366 const char* p;
5367 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5368 p = skip_over_field_signature(bytes, false, length, CHECK);
5369 legal = (p != NULL) && ((p - bytes) == (int)length);
5370 } else if (_major_version < JAVA_1_5_VERSION) {
5371 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5372 p = skip_over_field_name(bytes, true, length);
5373 legal = (p != NULL) && ((p - bytes) == (int)length);
5374 }
5375 } else {
5376 // 4900761: relax the constraints based on JSR202 spec
5377 // Class names may be drawn from the entire Unicode character set.
5378 // Identifiers between '/' must be unqualified names.
5379 // The utf8 string has been verified when parsing cpool entries.
5380 legal = verify_unqualified_name(bytes, length, LegalClass);
5381 }
5382 }
5383 if (!legal) {
5384 ResourceMark rm(THREAD);
5385 assert(_class_name != NULL, "invariant");
5386 Exceptions::fthrow(
5387 THREAD_AND_LOCATION,
5388 vmSymbols::java_lang_ClassFormatError(),
5389 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5390 _class_name->as_C_string()
5391 );
5392 return;
5393 }
5394 }
5395
5396 // Checks if name is a legal field name.
5397 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5398 if (!_need_verify || _relax_verify) { return; }
5399
5400 char* bytes = (char*)name->bytes();
5401 unsigned int length = name->utf8_length();
5402 bool legal = false;
5403
5404 if (length > 0) {
5405 if (_major_version < JAVA_1_5_VERSION) {
5406 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5407 const char* p = skip_over_field_name(bytes, false, length);
5408 legal = (p != NULL) && ((p - bytes) == (int)length);
5409 }
5410 } else {
5411 // 4881221: relax the constraints based on JSR202 spec
5412 legal = verify_unqualified_name(bytes, length, LegalField);
5413 }
5414 }
5415
5416 if (!legal) {
5417 ResourceMark rm(THREAD);
5418 assert(_class_name != NULL, "invariant");
5419 Exceptions::fthrow(
5420 THREAD_AND_LOCATION,
5421 vmSymbols::java_lang_ClassFormatError(),
5422 "Illegal field name \"%.*s\" in class %s", length, bytes,
5423 _class_name->as_C_string()
5424 );
5425 return;
5426 }
5427 }
5428
5429 // Checks if name is a legal method name.
5430 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5431 if (!_need_verify || _relax_verify) { return; }
5432
5433 assert(name != NULL, "method name is null");
5434 char* bytes = (char*)name->bytes();
5435 unsigned int length = name->utf8_length();
5436 bool legal = false;
5437
5438 if (length > 0) {
5439 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5440 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5441 legal = true;
5442 }
5443 } else if (_major_version < JAVA_1_5_VERSION) {
5444 const char* p;
5445 p = skip_over_field_name(bytes, false, length);
5446 legal = (p != NULL) && ((p - bytes) == (int)length);
5447 } else {
5448 // 4881221: relax the constraints based on JSR202 spec
5449 legal = verify_unqualified_name(bytes, length, LegalMethod);
5450 }
5451 }
5452
5453 if (!legal) {
5454 ResourceMark rm(THREAD);
5455 assert(_class_name != NULL, "invariant");
5456 Exceptions::fthrow(
5457 THREAD_AND_LOCATION,
5458 vmSymbols::java_lang_ClassFormatError(),
5459 "Illegal method name \"%.*s\" in class %s", length, bytes,
5460 _class_name->as_C_string()
5461 );
5462 return;
5463 }
5464 }
5465
5466
5467 // Checks if signature is a legal field signature.
5468 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5469 const Symbol* signature,
5470 TRAPS) const {
5471 if (!_need_verify) { return; }
5472
5473 const char* const bytes = (const char* const)signature->bytes();
5474 const unsigned int length = signature->utf8_length();
5475 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5476
5477 if (p == NULL || (p - bytes) != (int)length) {
5478 throwIllegalSignature("Field", name, signature, CHECK);
5479 }
5480 }
5481
5482 // Checks if signature is a legal method signature.
5483 // Returns number of parameters
5484 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5485 const Symbol* signature,
5486 TRAPS) const {
5487 if (!_need_verify) {
5488 // make sure caller's args_size will be less than 0 even for non-static
5489 // method so it will be recomputed in compute_size_of_parameters().
5490 return -2;
5491 }
5492
5493 // Class initializers cannot have args for class format version >= 51.
5494 if (name == vmSymbols::class_initializer_name() &&
5495 signature != vmSymbols::void_method_signature() &&
5496 _major_version >= JAVA_7_VERSION) {
5497 throwIllegalSignature("Method", name, signature, CHECK_0);
5498 return 0;
5499 }
5500
5501 unsigned int args_size = 0;
5502 const char* p = (const char*)signature->bytes();
5503 unsigned int length = signature->utf8_length();
5504 const char* nextp;
5505
5506 // The first character must be a '('
5507 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5508 length--;
5509 // Skip over legal field signatures
5510 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5511 while ((length > 0) && (nextp != NULL)) {
5512 args_size++;
5513 if (p[0] == 'J' || p[0] == 'D') {
5514 args_size++;
5515 }
5516 length -= nextp - p;
5517 p = nextp;
5518 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5519 }
5520 // The first non-signature thing better be a ')'
5521 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5522 length--;
5523 if (name->utf8_length() > 0 && name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
5524 // All internal methods must return void
5525 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5526 return args_size;
5527 }
5528 } else {
5529 // Now we better just have a return value
5530 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5531 if (nextp && ((int)length == (nextp - p))) {
5532 return args_size;
5533 }
5534 }
5535 }
5536 }
5537 // Report error
5538 throwIllegalSignature("Method", name, signature, CHECK_0);
5539 return 0;
5540 }
5541
5542 int ClassFileParser::static_field_size() const {
5543 assert(_field_info != NULL, "invariant");
5544 return _field_info->static_field_size;
5545 }
5546
5547 int ClassFileParser::total_oop_map_count() const {
5548 assert(_field_info != NULL, "invariant");
5549 return _field_info->total_oop_map_count;
5550 }
5551
5552 jint ClassFileParser::layout_size() const {
5553 assert(_field_info != NULL, "invariant");
5554 return _field_info->instance_size;
5555 }
5556
5557 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5558 const Array<Method*>* methods) {
5559 assert(ik != NULL, "invariant");
5560 assert(methods != NULL, "invariant");
5561
5562 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5563 // (We used to do this lazily, but now we query it in Rewriter,
5564 // which is eagerly done for every method, so we might as well do it now,
5565 // when everything is fresh in memory.)
5566 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5567
5568 if (klass_id != vmSymbols::NO_SID) {
5569 for (int j = 0; j < methods->length(); ++j) {
5570 Method* method = methods->at(j);
5571 method->init_intrinsic_id();
5572
5573 if (CheckIntrinsics) {
5574 // Check if an intrinsic is defined for method 'method',
5575 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5576 if (method->intrinsic_id() != vmIntrinsics::_none &&
5577 !method->intrinsic_candidate()) {
5578 tty->print("Compiler intrinsic is defined for method [%s], "
5579 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5580 method->name_and_sig_as_C_string(),
5581 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5582 );
5583 tty->cr();
5584 DEBUG_ONLY(vm_exit(1));
5585 }
5586 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5587 // but there is no intrinsic available for it.
5588 if (method->intrinsic_candidate() &&
5589 method->intrinsic_id() == vmIntrinsics::_none) {
5590 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5591 "but no compiler intrinsic is defined for the method.%s",
5592 method->name_and_sig_as_C_string(),
5593 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5594 );
5595 tty->cr();
5596 DEBUG_ONLY(vm_exit(1));
5597 }
5598 }
5599 } // end for
5600
5601 #ifdef ASSERT
5602 if (CheckIntrinsics) {
5603 // Check for orphan methods in the current class. A method m
5604 // of a class C is orphan if an intrinsic is defined for method m,
5605 // but class C does not declare m.
5606 // The check is potentially expensive, therefore it is available
5607 // only in debug builds.
5608
5609 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5610 if (vmIntrinsics::_compiledLambdaForm == id) {
5611 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5612 // generated for the JVM from a LambdaForm and therefore no method
5613 // is defined for it.
5614 continue;
5615 }
5616
5617 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5618 // Check if the current class contains a method with the same
5619 // name, flags, signature.
5620 bool match = false;
5621 for (int j = 0; j < methods->length(); ++j) {
5622 const Method* method = methods->at(j);
5623 if (method->intrinsic_id() == id) {
5624 match = true;
5625 break;
5626 }
5627 }
5628
5629 if (!match) {
5630 char buf[1000];
5631 tty->print("Compiler intrinsic is defined for method [%s], "
5632 "but the method is not available in class [%s].%s",
5633 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5634 buf, sizeof(buf)),
5635 ik->name()->as_C_string(),
5636 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5637 );
5638 tty->cr();
5639 DEBUG_ONLY(vm_exit(1));
5640 }
5641 }
5642 } // end for
5643 } // CheckIntrinsics
5644 #endif // ASSERT
5645 }
5646 }
5647
5648 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5649 if (_klass != NULL) {
5650 return _klass;
5651 }
5652
5653 InstanceKlass* const ik =
5654 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5655
5656 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5657
5658 assert(_klass == ik, "invariant");
5659
5660
5661 if (ik->should_store_fingerprint()) {
5662 ik->store_fingerprint(_stream->compute_fingerprint());
5663 }
5664
5665 ik->set_has_passed_fingerprint_check(false);
5666 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5667 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5668 uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint();
5669 if (aot_fp != 0 && aot_fp == fp) {
5670 // This class matches with a class saved in an AOT library
5671 ik->set_has_passed_fingerprint_check(true);
5672 } else {
5673 ResourceMark rm;
5674 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5675 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5676 }
5677 }
5678
5679 return ik;
5680 }
5681
5682 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5683 assert(ik != NULL, "invariant");
5684
5685 // Set name and CLD before adding to CLD
5686 ik->set_class_loader_data(_loader_data);
5687 ik->set_name(_class_name);
5688
5689 // Add all classes to our internal class loader list here,
5690 // including classes in the bootstrap (NULL) class loader.
5691 const bool publicize = !is_internal();
5692
5693 _loader_data->add_class(ik, publicize);
5694
5695 set_klass_to_deallocate(ik);
5696
5697 assert(_field_info != NULL, "invariant");
5698 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5699 assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count,
5700 "sanity");
5701
5702 assert(ik->is_instance_klass(), "sanity");
5703 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5704
5705 // Fill in information already parsed
5706 ik->set_should_verify_class(_need_verify);
5707
5708 // Not yet: supers are done below to support the new subtype-checking fields
5709 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5710 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5711 assert(_fac != NULL, "invariant");
5712 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5713
5714 // this transfers ownership of a lot of arrays from
5715 // the parser onto the InstanceKlass*
5716 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5717
5718 // note that is not safe to use the fields in the parser from this point on
5719 assert(NULL == _cp, "invariant");
5720 assert(NULL == _fields, "invariant");
5721 assert(NULL == _methods, "invariant");
5722 assert(NULL == _inner_classes, "invariant");
5723 assert(NULL == _nest_members, "invariant");
5724 assert(NULL == _local_interfaces, "invariant");
5725 assert(NULL == _combined_annotations, "invariant");
5726 assert(NULL == _record_components, "invariant");
5727
5728 if (_has_final_method) {
5729 ik->set_has_final_method();
5730 }
5731
5732 ik->copy_method_ordering(_method_ordering, CHECK);
5733 // The InstanceKlass::_methods_jmethod_ids cache
5734 // is managed on the assumption that the initial cache
5735 // size is equal to the number of methods in the class. If
5736 // that changes, then InstanceKlass::idnum_can_increment()
5737 // has to be changed accordingly.
5738 ik->set_initial_method_idnum(ik->methods()->length());
5739
5740 ik->set_this_class_index(_this_class_index);
5741
5742 if (is_unsafe_anonymous()) {
5743 // _this_class_index is a CONSTANT_Class entry that refers to this
5744 // anonymous class itself. If this class needs to refer to its own methods or
5745 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5746 // _this_class_index. However, because this class is anonymous (it's
5747 // not stored in SystemDictionary), _this_class_index cannot be resolved
5748 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5749 // Therefore, we must eagerly resolve _this_class_index now.
5750 ik->constants()->klass_at_put(_this_class_index, ik);
5751 }
5752
5753 ik->set_minor_version(_minor_version);
5754 ik->set_major_version(_major_version);
5755 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5756 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5757
5758 if (_unsafe_anonymous_host != NULL) {
5759 assert (ik->is_unsafe_anonymous(), "should be the same");
5760 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host);
5761 }
5762
5763 // Set PackageEntry for this_klass
5764 oop cl = ik->class_loader();
5765 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5766 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5767 ik->set_package(cld, CHECK);
5768
5769 const Array<Method*>* const methods = ik->methods();
5770 assert(methods != NULL, "invariant");
5771 const int methods_len = methods->length();
5772
5773 check_methods_for_intrinsics(ik, methods);
5774
5775 // Fill in field values obtained by parse_classfile_attributes
5776 if (_parsed_annotations->has_any_annotations()) {
5777 _parsed_annotations->apply_to(ik);
5778 }
5779
5780 apply_parsed_class_attributes(ik);
5781
5782 // Miranda methods
5783 if ((_num_miranda_methods > 0) ||
5784 // if this class introduced new miranda methods or
5785 (_super_klass != NULL && _super_klass->has_miranda_methods())
5786 // super class exists and this class inherited miranda methods
5787 ) {
5788 ik->set_has_miranda_methods(); // then set a flag
5789 }
5790
5791 // Fill in information needed to compute superclasses.
5792 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5793 ik->set_transitive_interfaces(_transitive_interfaces);
5794 _transitive_interfaces = NULL;
5795
5796 // Initialize itable offset tables
5797 klassItable::setup_itable_offset_table(ik);
5798
5799 // Compute transitive closure of interfaces this class implements
5800 // Do final class setup
5801 fill_oop_maps(ik,
5802 _field_info->nonstatic_oop_map_count,
5803 _field_info->nonstatic_oop_offsets,
5804 _field_info->nonstatic_oop_counts);
5805
5806 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5807 set_precomputed_flags(ik);
5808
5809 // check if this class can access its super class
5810 check_super_class_access(ik, CHECK);
5811
5812 // check if this class can access its superinterfaces
5813 check_super_interface_access(ik, CHECK);
5814
5815 // check if this class overrides any final method
5816 check_final_method_override(ik, CHECK);
5817
5818 // reject static interface methods prior to Java 8
5819 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5820 check_illegal_static_method(ik, CHECK);
5821 }
5822
5823 // Obtain this_klass' module entry
5824 ModuleEntry* module_entry = ik->module();
5825 assert(module_entry != NULL, "module_entry should always be set");
5826
5827 // Obtain java.lang.Module
5828 Handle module_handle(THREAD, module_entry->module());
5829
5830 // Allocate mirror and initialize static fields
5831 // The create_mirror() call will also call compute_modifiers()
5832 java_lang_Class::create_mirror(ik,
5833 Handle(THREAD, _loader_data->class_loader()),
5834 module_handle,
5835 _protection_domain,
5836 CHECK);
5837
5838 assert(_all_mirandas != NULL, "invariant");
5839
5840 // Generate any default methods - default methods are public interface methods
5841 // that have a default implementation. This is new with Java 8.
5842 if (_has_nonstatic_concrete_methods) {
5843 DefaultMethods::generate_default_methods(ik,
5844 _all_mirandas,
5845 CHECK);
5846 }
5847
5848 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5849 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5850 !module_entry->has_default_read_edges()) {
5851 if (!module_entry->set_has_default_read_edges()) {
5852 // We won a potential race
5853 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5854 }
5855 }
5856
5857 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5858
5859 if (!is_internal()) {
5860 if (log_is_enabled(Info, class, load)) {
5861 ResourceMark rm;
5862 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5863 ik->print_class_load_logging(_loader_data, module_name, _stream);
5864 }
5865
5866 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5867 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5868 log_is_enabled(Info, class, preview)) {
5869 ResourceMark rm;
5870 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5871 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5872 }
5873
5874 if (log_is_enabled(Debug, class, resolve)) {
5875 ResourceMark rm;
5876 // print out the superclass.
5877 const char * from = ik->external_name();
5878 if (ik->java_super() != NULL) {
5879 log_debug(class, resolve)("%s %s (super)",
5880 from,
5881 ik->java_super()->external_name());
5882 }
5883 // print out each of the interface classes referred to by this class.
5884 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5885 if (local_interfaces != NULL) {
5886 const int length = local_interfaces->length();
5887 for (int i = 0; i < length; i++) {
5888 const InstanceKlass* const k = local_interfaces->at(i);
5889 const char * to = k->external_name();
5890 log_debug(class, resolve)("%s %s (interface)", from, to);
5891 }
5892 }
5893 }
5894 }
5895
5896 JFR_ONLY(INIT_ID(ik);)
5897
5898 // If we reach here, all is well.
5899 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5900 // in order for it to not be destroyed in the ClassFileParser destructor.
5901 set_klass_to_deallocate(NULL);
5902
5903 // it's official
5904 set_klass(ik);
5905
5906 debug_only(ik->verify();)
5907 }
5908
5909 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5910 // Decrement the refcount in the old name, since we're clobbering it.
5911 _class_name->decrement_refcount();
5912
5913 _class_name = new_class_name;
5914 // Increment the refcount of the new name.
5915 // Now the ClassFileParser owns this name and will decrement in
5916 // the destructor.
5917 _class_name->increment_refcount();
5918 }
5919
5920
5921 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's
5922 // package by prepending its host class's package name to its class name and setting
5923 // its _class_name field.
5924 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) {
5925 ResourceMark rm(THREAD);
5926 assert(strrchr(_class_name->as_C_string(), JVM_SIGNATURE_SLASH) == NULL,
5927 "Unsafe anonymous class should not be in a package");
5928 const char* host_pkg_name =
5929 ClassLoader::package_from_name(unsafe_anonymous_host->name()->as_C_string(), NULL);
5930
5931 if (host_pkg_name != NULL) {
5932 int host_pkg_len = (int)strlen(host_pkg_name);
5933 int class_name_len = _class_name->utf8_length();
5934 int symbol_len = host_pkg_len + 1 + class_name_len;
5935 char* new_anon_name = NEW_RESOURCE_ARRAY(char, symbol_len + 1);
5936 int n = os::snprintf(new_anon_name, symbol_len + 1, "%s/%.*s",
5937 host_pkg_name, class_name_len, _class_name->base());
5938 assert(n == symbol_len, "Unexpected number of characters in string");
5939
5940 // Decrement old _class_name to avoid leaking.
5941 _class_name->decrement_refcount();
5942
5943 // Create a symbol and update the anonymous class name.
5944 // The new class name is created with a refcount of one. When installed into the InstanceKlass,
5945 // it'll be two and when the ClassFileParser destructor runs, it'll go back to one and get deleted
5946 // when the class is unloaded.
5947 _class_name = SymbolTable::new_symbol(new_anon_name, symbol_len);
5948 }
5949 }
5950
5951 // If the host class and the anonymous class are in the same package then do
5952 // nothing. If the anonymous class is in the unnamed package then move it to its
5953 // host's package. If the classes are in different packages then throw an IAE
5954 // exception.
5955 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) {
5956 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class");
5957
5958 const jbyte* anon_last_slash = UTF8::strrchr((const jbyte*)_class_name->base(),
5959 _class_name->utf8_length(), JVM_SIGNATURE_SLASH);
5960 if (anon_last_slash == NULL) { // Unnamed package
5961 prepend_host_package_name(_unsafe_anonymous_host, CHECK);
5962 } else {
5963 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) {
5964 ResourceMark rm(THREAD);
5965 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
5966 err_msg("Host class %s and anonymous class %s are in different packages",
5967 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string()));
5968 }
5969 }
5970 }
5971
5972 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5973 bool trusted = (loader_data->is_the_null_class_loader_data() ||
5974 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
5975 bool need_verify =
5976 // verifyAll
5977 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5978 // verifyRemote
5979 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5980 return !need_verify;
5981 }
5982
5983 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5984 Symbol* name,
5985 ClassLoaderData* loader_data,
5986 Handle protection_domain,
5987 const InstanceKlass* unsafe_anonymous_host,
5988 GrowableArray<Handle>* cp_patches,
5989 Publicity pub_level,
5990 TRAPS) :
5991 _stream(stream),
5992 _requested_name(name),
5993 _class_name(NULL),
5994 _loader_data(loader_data),
5995 _unsafe_anonymous_host(unsafe_anonymous_host),
5996 _cp_patches(cp_patches),
5997 _num_patched_klasses(0),
5998 _max_num_patched_klasses(0),
5999 _orig_cp_size(0),
6000 _first_patched_klass_resolved_index(0),
6001 _super_klass(),
6002 _cp(NULL),
6003 _fields(NULL),
6004 _methods(NULL),
6005 _inner_classes(NULL),
6006 _nest_members(NULL),
6007 _nest_host(0),
6008 _record_components(NULL),
6009 _local_interfaces(NULL),
6010 _transitive_interfaces(NULL),
6011 _combined_annotations(NULL),
6012 _class_annotations(NULL),
6013 _class_type_annotations(NULL),
6014 _fields_annotations(NULL),
6015 _fields_type_annotations(NULL),
6016 _klass(NULL),
6017 _klass_to_deallocate(NULL),
6018 _parsed_annotations(NULL),
6019 _fac(NULL),
6020 _field_info(NULL),
6021 _method_ordering(NULL),
6022 _all_mirandas(NULL),
6023 _vtable_size(0),
6024 _itable_size(0),
6025 _num_miranda_methods(0),
6026 _rt(REF_NONE),
6027 _protection_domain(protection_domain),
6028 _access_flags(),
6029 _pub_level(pub_level),
6030 _bad_constant_seen(0),
6031 _synthetic_flag(false),
6032 _sde_length(false),
6033 _sde_buffer(NULL),
6034 _sourcefile_index(0),
6035 _generic_signature_index(0),
6036 _major_version(0),
6037 _minor_version(0),
6038 _this_class_index(0),
6039 _super_class_index(0),
6040 _itfs_len(0),
6041 _java_fields_count(0),
6042 _need_verify(false),
6043 _relax_verify(false),
6044 _has_nonstatic_concrete_methods(false),
6045 _declares_nonstatic_concrete_methods(false),
6046 _has_final_method(false),
6047 _has_finalizer(false),
6048 _has_empty_finalizer(false),
6049 _has_vanilla_constructor(false),
6050 _max_bootstrap_specifier_index(-1) {
6051
6052 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6053 _class_name->increment_refcount();
6054
6055 assert(THREAD->is_Java_thread(), "invariant");
6056 assert(_loader_data != NULL, "invariant");
6057 assert(stream != NULL, "invariant");
6058 assert(_stream != NULL, "invariant");
6059 assert(_stream->buffer() == _stream->current(), "invariant");
6060 assert(_class_name != NULL, "invariant");
6061 assert(0 == _access_flags.as_int(), "invariant");
6062
6063 // Figure out whether we can skip format checking (matching classic VM behavior)
6064 if (DumpSharedSpaces) {
6065 // verify == true means it's a 'remote' class (i.e., non-boot class)
6066 // Verification decision is based on BytecodeVerificationRemote flag
6067 // for those classes.
6068 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
6069 BytecodeVerificationLocal;
6070 }
6071 else {
6072 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
6073 stream->need_verify());
6074 }
6075 if (_cp_patches != NULL) {
6076 int len = _cp_patches->length();
6077 for (int i=0; i<len; i++) {
6078 if (has_cp_patch_at(i)) {
6079 Handle patch = cp_patch_at(i);
6080 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
6081 // We need to append the names of the patched classes to the end of the constant pool,
6082 // because a patched class may have a Utf8 name that's not already included in the
6083 // original constant pool. These class names are used when patch_constant_pool()
6084 // calls patch_class().
6085 //
6086 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
6087 // At this point, we don't know the tag for index i yet, because we haven't parsed the
6088 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
6089 _max_num_patched_klasses++;
6090 }
6091 }
6092 }
6093 }
6094
6095 // synch back verification state to stream
6096 stream->set_verify(_need_verify);
6097
6098 // Check if verification needs to be relaxed for this class file
6099 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
6100 _relax_verify = relax_format_check_for(_loader_data);
6101
6102 parse_stream(stream, CHECK);
6103
6104 post_process_parsed_stream(stream, _cp, CHECK);
6105 }
6106
6107 void ClassFileParser::clear_class_metadata() {
6108 // metadata created before the instance klass is created. Must be
6109 // deallocated if classfile parsing returns an error.
6110 _cp = NULL;
6111 _fields = NULL;
6112 _methods = NULL;
6113 _inner_classes = NULL;
6114 _nest_members = NULL;
6115 _local_interfaces = NULL;
6116 _combined_annotations = NULL;
6117 _class_annotations = _class_type_annotations = NULL;
6118 _fields_annotations = _fields_type_annotations = NULL;
6119 _record_components = NULL;
6120 }
6121
6122 // Destructor to clean up
6123 ClassFileParser::~ClassFileParser() {
6124 _class_name->decrement_refcount();
6125
6126 if (_cp != NULL) {
6127 MetadataFactory::free_metadata(_loader_data, _cp);
6128 }
6129 if (_fields != NULL) {
6130 MetadataFactory::free_array<u2>(_loader_data, _fields);
6131 }
6132
6133 if (_methods != NULL) {
6134 // Free methods
6135 InstanceKlass::deallocate_methods(_loader_data, _methods);
6136 }
6137
6138 // beware of the Universe::empty_blah_array!!
6139 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6140 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6141 }
6142
6143 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
6144 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6145 }
6146
6147 if (_record_components != NULL) {
6148 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
6149 }
6150
6151 // Free interfaces
6152 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6153 _local_interfaces, _transitive_interfaces);
6154
6155 if (_combined_annotations != NULL) {
6156 // After all annotations arrays have been created, they are installed into the
6157 // Annotations object that will be assigned to the InstanceKlass being created.
6158
6159 // Deallocate the Annotations object and the installed annotations arrays.
6160 _combined_annotations->deallocate_contents(_loader_data);
6161
6162 // If the _combined_annotations pointer is non-NULL,
6163 // then the other annotations fields should have been cleared.
6164 assert(_class_annotations == NULL, "Should have been cleared");
6165 assert(_class_type_annotations == NULL, "Should have been cleared");
6166 assert(_fields_annotations == NULL, "Should have been cleared");
6167 assert(_fields_type_annotations == NULL, "Should have been cleared");
6168 } else {
6169 // If the annotations arrays were not installed into the Annotations object,
6170 // then they have to be deallocated explicitly.
6171 MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
6172 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
6173 Annotations::free_contents(_loader_data, _fields_annotations);
6174 Annotations::free_contents(_loader_data, _fields_type_annotations);
6175 }
6176
6177 clear_class_metadata();
6178 _transitive_interfaces = NULL;
6179
6180 // deallocate the klass if already created. Don't directly deallocate, but add
6181 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6182 // at a safepoint.
6183 if (_klass_to_deallocate != NULL) {
6184 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6185 }
6186 }
6187
6188 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6189 TRAPS) {
6190
6191 assert(stream != NULL, "invariant");
6192 assert(_class_name != NULL, "invariant");
6193
6194 // BEGIN STREAM PARSING
6195 stream->guarantee_more(8, CHECK); // magic, major, minor
6196 // Magic value
6197 const u4 magic = stream->get_u4_fast();
6198 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6199 "Incompatible magic value %u in class file %s",
6200 magic, CHECK);
6201
6202 // Version numbers
6203 _minor_version = stream->get_u2_fast();
6204 _major_version = stream->get_u2_fast();
6205
6206 if (DumpSharedSpaces && _major_version < JAVA_6_VERSION) {
6207 ResourceMark rm;
6208 warning("Pre JDK 6 class not supported by CDS: %u.%u %s",
6209 _major_version, _minor_version, _class_name->as_C_string());
6210 Exceptions::fthrow(
6211 THREAD_AND_LOCATION,
6212 vmSymbols::java_lang_UnsupportedClassVersionError(),
6213 "Unsupported major.minor version for dump time %u.%u",
6214 _major_version,
6215 _minor_version);
6216 }
6217
6218 // Check version numbers - we check this even with verifier off
6219 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6220
6221 stream->guarantee_more(3, CHECK); // length, first cp tag
6222 u2 cp_size = stream->get_u2_fast();
6223
6224 guarantee_property(
6225 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6226 cp_size, CHECK);
6227
6228 _orig_cp_size = cp_size;
6229 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6230 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6231 }
6232 cp_size += _max_num_patched_klasses;
6233
6234 _cp = ConstantPool::allocate(_loader_data,
6235 cp_size,
6236 CHECK);
6237
6238 ConstantPool* const cp = _cp;
6239
6240 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6241
6242 assert(cp_size == (const u2)cp->length(), "invariant");
6243
6244 // ACCESS FLAGS
6245 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6246
6247 // Access flags
6248 jint flags;
6249 // JVM_ACC_MODULE is defined in JDK-9 and later.
6250 if (_major_version >= JAVA_9_VERSION) {
6251 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
6252 } else {
6253 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
6254 }
6255
6256 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6257 // Set abstract bit for old class files for backward compatibility
6258 flags |= JVM_ACC_ABSTRACT;
6259 }
6260
6261 verify_legal_class_modifiers(flags, CHECK);
6262
6263 short bad_constant = class_bad_constant_seen();
6264 if (bad_constant != 0) {
6265 // Do not throw CFE until after the access_flags are checked because if
6266 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6267 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6268 }
6269
6270 _access_flags.set_flags(flags);
6271
6272 // This class and superclass
6273 _this_class_index = stream->get_u2_fast();
6274 check_property(
6275 valid_cp_range(_this_class_index, cp_size) &&
6276 cp->tag_at(_this_class_index).is_unresolved_klass(),
6277 "Invalid this class index %u in constant pool in class file %s",
6278 _this_class_index, CHECK);
6279
6280 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6281 assert(class_name_in_cp != NULL, "class_name can't be null");
6282
6283 // Update _class_name to reflect the name in the constant pool
6284 update_class_name(class_name_in_cp);
6285
6286 // Don't need to check whether this class name is legal or not.
6287 // It has been checked when constant pool is parsed.
6288 // However, make sure it is not an array type.
6289 if (_need_verify) {
6290 guarantee_property(_class_name->char_at(0) != JVM_SIGNATURE_ARRAY,
6291 "Bad class name in class file %s",
6292 CHECK);
6293 }
6294
6295 // Checks if name in class file matches requested name
6296 if (_requested_name != NULL && _requested_name != _class_name) {
6297 ResourceMark rm(THREAD);
6298 Exceptions::fthrow(
6299 THREAD_AND_LOCATION,
6300 vmSymbols::java_lang_NoClassDefFoundError(),
6301 "%s (wrong name: %s)",
6302 _class_name->as_C_string(),
6303 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6304 );
6305 return;
6306 }
6307
6308 // if this is an anonymous class fix up its name if it's in the unnamed
6309 // package. Otherwise, throw IAE if it is in a different package than
6310 // its host class.
6311 if (_unsafe_anonymous_host != NULL) {
6312 fix_unsafe_anonymous_class_name(CHECK);
6313 }
6314
6315 // Verification prevents us from creating names with dots in them, this
6316 // asserts that that's the case.
6317 assert(is_internal_format(_class_name), "external class name format used internally");
6318
6319 if (!is_internal()) {
6320 LogTarget(Debug, class, preorder) lt;
6321 if (lt.is_enabled()){
6322 ResourceMark rm(THREAD);
6323 LogStream ls(lt);
6324 ls.print("%s", _class_name->as_klass_external_name());
6325 if (stream->source() != NULL) {
6326 ls.print(" source: %s", stream->source());
6327 }
6328 ls.cr();
6329 }
6330
6331 #if INCLUDE_CDS
6332 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6333 if (!ClassLoader::has_jrt_entry()) {
6334 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6335 DumpLoadedClassList = NULL;
6336 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6337 _unsafe_anonymous_host == NULL) {
6338 // Only dump the classes that can be stored into CDS archive.
6339 // Unsafe anonymous classes such as generated LambdaForm classes are also not included.
6340 oop class_loader = _loader_data->class_loader();
6341 ResourceMark rm(THREAD);
6342 bool skip = false;
6343 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6344 // For the boot and platform class loaders, skip classes that are not found in the
6345 // java runtime image, such as those found in the --patch-module entries.
6346 // These classes can't be loaded from the archive during runtime.
6347 if (!stream->from_boot_loader_modules_image() && strncmp(stream->source(), "jrt:", 4) != 0) {
6348 skip = true;
6349 }
6350
6351 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6352 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6353 // as they can be loaded from the archive during runtime.
6354 skip = false;
6355 }
6356 }
6357 if (skip) {
6358 tty->print_cr("skip writing class %s from source %s to classlist file",
6359 _class_name->as_C_string(), stream->source());
6360 } else {
6361 classlist_file->print_cr("%s", _class_name->as_C_string());
6362 classlist_file->flush();
6363 }
6364 }
6365 }
6366 #endif
6367 }
6368
6369 // SUPERKLASS
6370 _super_class_index = stream->get_u2_fast();
6371 _super_klass = parse_super_class(cp,
6372 _super_class_index,
6373 _need_verify,
6374 CHECK);
6375
6376 // Interfaces
6377 _itfs_len = stream->get_u2_fast();
6378 parse_interfaces(stream,
6379 _itfs_len,
6380 cp,
6381 &_has_nonstatic_concrete_methods,
6382 CHECK);
6383
6384 assert(_local_interfaces != NULL, "invariant");
6385
6386 // Fields (offsets are filled in later)
6387 _fac = new FieldAllocationCount();
6388 parse_fields(stream,
6389 _access_flags.is_interface(),
6390 _fac,
6391 cp,
6392 cp_size,
6393 &_java_fields_count,
6394 CHECK);
6395
6396 assert(_fields != NULL, "invariant");
6397
6398 // Methods
6399 AccessFlags promoted_flags;
6400 parse_methods(stream,
6401 _access_flags.is_interface(),
6402 &promoted_flags,
6403 &_has_final_method,
6404 &_declares_nonstatic_concrete_methods,
6405 CHECK);
6406
6407 assert(_methods != NULL, "invariant");
6408
6409 // promote flags from parse_methods() to the klass' flags
6410 _access_flags.add_promoted_flags(promoted_flags.as_int());
6411
6412 if (_declares_nonstatic_concrete_methods) {
6413 _has_nonstatic_concrete_methods = true;
6414 }
6415
6416 // Additional attributes/annotations
6417 _parsed_annotations = new ClassAnnotationCollector();
6418 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6419
6420 assert(_inner_classes != NULL, "invariant");
6421
6422 // Finalize the Annotations metadata object,
6423 // now that all annotation arrays have been created.
6424 create_combined_annotations(CHECK);
6425
6426 // Make sure this is the end of class file stream
6427 guarantee_property(stream->at_eos(),
6428 "Extra bytes at the end of class file %s",
6429 CHECK);
6430
6431 // all bytes in stream read and parsed
6432 }
6433
6434 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6435 ConstantPool* cp,
6436 TRAPS) {
6437 assert(stream != NULL, "invariant");
6438 assert(stream->at_eos(), "invariant");
6439 assert(cp != NULL, "invariant");
6440 assert(_loader_data != NULL, "invariant");
6441
6442 if (_class_name == vmSymbols::java_lang_Object()) {
6443 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6444 "java.lang.Object cannot implement an interface in class file %s",
6445 CHECK);
6446 }
6447 // We check super class after class file is parsed and format is checked
6448 if (_super_class_index > 0 && NULL ==_super_klass) {
6449 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6450 if (_access_flags.is_interface()) {
6451 // Before attempting to resolve the superclass, check for class format
6452 // errors not checked yet.
6453 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6454 "Interfaces must have java.lang.Object as superclass in class file %s",
6455 CHECK);
6456 }
6457 Handle loader(THREAD, _loader_data->class_loader());
6458 _super_klass = (const InstanceKlass*)
6459 SystemDictionary::resolve_super_or_fail(_class_name,
6460 super_class_name,
6461 loader,
6462 _protection_domain,
6463 true,
6464 CHECK);
6465 }
6466
6467 if (_super_klass != NULL) {
6468 if (_super_klass->has_nonstatic_concrete_methods()) {
6469 _has_nonstatic_concrete_methods = true;
6470 }
6471
6472 if (_super_klass->is_interface()) {
6473 ResourceMark rm(THREAD);
6474 Exceptions::fthrow(
6475 THREAD_AND_LOCATION,
6476 vmSymbols::java_lang_IncompatibleClassChangeError(),
6477 "class %s has interface %s as super class",
6478 _class_name->as_klass_external_name(),
6479 _super_klass->external_name()
6480 );
6481 return;
6482 }
6483 // Make sure super class is not final
6484 if (_super_klass->is_final()) {
6485 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6486 }
6487 }
6488
6489 // Compute the transitive list of all unique interfaces implemented by this class
6490 _transitive_interfaces =
6491 compute_transitive_interfaces(_super_klass,
6492 _local_interfaces,
6493 _loader_data,
6494 CHECK);
6495
6496 assert(_transitive_interfaces != NULL, "invariant");
6497
6498 // sort methods
6499 _method_ordering = sort_methods(_methods);
6500
6501 _all_mirandas = new GrowableArray<Method*>(20);
6502
6503 Handle loader(THREAD, _loader_data->class_loader());
6504 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6505 &_num_miranda_methods,
6506 _all_mirandas,
6507 _super_klass,
6508 _methods,
6509 _access_flags,
6510 _major_version,
6511 loader,
6512 _class_name,
6513 _local_interfaces,
6514 CHECK);
6515
6516 // Size of Java itable (in words)
6517 _itable_size = _access_flags.is_interface() ? 0 :
6518 klassItable::compute_itable_size(_transitive_interfaces);
6519
6520 assert(_fac != NULL, "invariant");
6521 assert(_parsed_annotations != NULL, "invariant");
6522
6523 _field_info = new FieldLayoutInfo();
6524 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6525
6526 // Compute reference typ
6527 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6528
6529 }
6530
6531 void ClassFileParser::set_klass(InstanceKlass* klass) {
6532
6533 #ifdef ASSERT
6534 if (klass != NULL) {
6535 assert(NULL == _klass, "leaking?");
6536 }
6537 #endif
6538
6539 _klass = klass;
6540 }
6541
6542 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6543
6544 #ifdef ASSERT
6545 if (klass != NULL) {
6546 assert(NULL == _klass_to_deallocate, "leaking?");
6547 }
6548 #endif
6549
6550 _klass_to_deallocate = klass;
6551 }
6552
6553 // Caller responsible for ResourceMark
6554 // clone stream with rewound position
6555 const ClassFileStream* ClassFileParser::clone_stream() const {
6556 assert(_stream != NULL, "invariant");
6557
6558 return _stream->clone();
6559 }
6560 // ----------------------------------------------------------------------------
6561 // debugging
6562
6563 #ifdef ASSERT
6564
6565 // return true if class_name contains no '.' (internal format is '/')
6566 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6567 if (class_name != NULL) {
6568 ResourceMark rm;
6569 char* name = class_name->as_C_string();
6570 return strchr(name, JVM_SIGNATURE_DOT) == NULL;
6571 } else {
6572 return true;
6573 }
6574 }
6575
6576 #endif