1 /*
2 * Copyright (c) 1997, 2018, 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/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/verificationType.hpp"
38 #include "classfile/verifier.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/allocation.hpp"
43 #include "memory/metadataFactory.hpp"
44 #include "memory/oopFactory.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "memory/universe.hpp"
47 #include "oops/annotations.hpp"
48 #include "oops/constantPool.inline.hpp"
49 #include "oops/fieldStreams.hpp"
50 #include "oops/instanceKlass.hpp"
51 #include "oops/instanceMirrorKlass.hpp"
52 #include "oops/klass.inline.hpp"
53 #include "oops/klassVtable.hpp"
54 #include "oops/metadata.hpp"
55 #include "oops/method.hpp"
56 #include "oops/oop.inline.hpp"
57 #include "oops/symbol.hpp"
58 #include "prims/jvmtiExport.hpp"
59 #include "prims/jvmtiThreadState.hpp"
60 #include "runtime/arguments.hpp"
61 #include "runtime/handles.inline.hpp"
62 #include "runtime/javaCalls.hpp"
63 #include "runtime/perfData.hpp"
64 #include "runtime/reflection.hpp"
65 #include "runtime/safepointVerifiers.hpp"
66 #include "runtime/signature.hpp"
67 #include "runtime/timer.hpp"
68 #include "services/classLoadingService.hpp"
69 #include "services/threadService.hpp"
70 #include "utilities/align.hpp"
71 #include "utilities/bitMap.inline.hpp"
72 #include "utilities/copy.hpp"
73 #include "utilities/exceptions.hpp"
74 #include "utilities/globalDefinitions.hpp"
75 #include "utilities/growableArray.hpp"
76 #include "utilities/macros.hpp"
77 #include "utilities/ostream.hpp"
78 #include "utilities/resourceHash.hpp"
79 #if INCLUDE_CDS
80 #include "classfile/systemDictionaryShared.hpp"
81 #endif
82 #if INCLUDE_JFR
83 #include "jfr/support/jfrTraceIdExtension.hpp"
84 #endif
85
86 // We generally try to create the oops directly when parsing, rather than
87 // allocating temporary data structures and copying the bytes twice. A
88 // temporary area is only needed when parsing utf8 entries in the constant
89 // pool and when parsing line number tables.
90
91 // We add assert in debug mode when class format is not checked.
92
93 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
94 #define JAVA_MIN_SUPPORTED_VERSION 45
95 #define JAVA_PREVIEW_MINOR_VERSION 65535
96
97 // Used for two backward compatibility reasons:
98 // - to check for new additions to the class file format in JDK1.5
99 // - to check for bug fixes in the format checker in JDK1.5
100 #define JAVA_1_5_VERSION 49
101
102 // Used for backward compatibility reasons:
103 // - to check for javac bug fixes that happened after 1.5
104 // - also used as the max version when running in jdk6
105 #define JAVA_6_VERSION 50
106
107 // Used for backward compatibility reasons:
108 // - to disallow argument and require ACC_STATIC for <clinit> methods
109 #define JAVA_7_VERSION 51
110
111 // Extension method support.
112 #define JAVA_8_VERSION 52
113
114 #define JAVA_9_VERSION 53
115
116 #define JAVA_10_VERSION 54
117
118 #define JAVA_11_VERSION 55
119
120 #define JAVA_12_VERSION 56
121
122 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
123 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION,
124 "Unexpected bad constant pool entry");
125 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
126 }
127
128 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
129 ConstantPool* cp,
130 const int length,
131 TRAPS) {
132 assert(stream != NULL, "invariant");
133 assert(cp != NULL, "invariant");
134
135 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
136 // this function (_current can be allocated in a register, with scalar
137 // replacement of aggregates). The _current pointer is copied back to
138 // stream() when this function returns. DON'T call another method within
139 // this method that uses stream().
140 const ClassFileStream cfs1 = *stream;
141 const ClassFileStream* const cfs = &cfs1;
142
143 assert(cfs->allocated_on_stack(), "should be local");
144 debug_only(const u1* const old_current = stream->current();)
145
146 // Used for batching symbol allocations.
147 const char* names[SymbolTable::symbol_alloc_batch_size];
148 int lengths[SymbolTable::symbol_alloc_batch_size];
149 int indices[SymbolTable::symbol_alloc_batch_size];
150 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
151 int names_count = 0;
152
153 // parsing Index 0 is unused
154 for (int index = 1; index < length; index++) {
155 // Each of the following case guarantees one more byte in the stream
156 // for the following tag or the access_flags following constant pool,
157 // so we don't need bounds-check for reading tag.
158 const u1 tag = cfs->get_u1_fast();
159 switch (tag) {
160 case JVM_CONSTANT_Class : {
161 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
162 const u2 name_index = cfs->get_u2_fast();
163 cp->klass_index_at_put(index, name_index);
164 break;
165 }
166 case JVM_CONSTANT_Fieldref: {
167 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
168 const u2 class_index = cfs->get_u2_fast();
169 const u2 name_and_type_index = cfs->get_u2_fast();
170 cp->field_at_put(index, class_index, name_and_type_index);
171 break;
172 }
173 case JVM_CONSTANT_Methodref: {
174 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
175 const u2 class_index = cfs->get_u2_fast();
176 const u2 name_and_type_index = cfs->get_u2_fast();
177 cp->method_at_put(index, class_index, name_and_type_index);
178 break;
179 }
180 case JVM_CONSTANT_InterfaceMethodref: {
181 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
182 const u2 class_index = cfs->get_u2_fast();
183 const u2 name_and_type_index = cfs->get_u2_fast();
184 cp->interface_method_at_put(index, class_index, name_and_type_index);
185 break;
186 }
187 case JVM_CONSTANT_String : {
188 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
189 const u2 string_index = cfs->get_u2_fast();
190 cp->string_index_at_put(index, string_index);
191 break;
192 }
193 case JVM_CONSTANT_MethodHandle :
194 case JVM_CONSTANT_MethodType: {
195 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
196 classfile_parse_error(
197 "Class file version does not support constant tag %u in class file %s",
198 tag, CHECK);
199 }
200 if (tag == JVM_CONSTANT_MethodHandle) {
201 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
202 const u1 ref_kind = cfs->get_u1_fast();
203 const u2 method_index = cfs->get_u2_fast();
204 cp->method_handle_index_at_put(index, ref_kind, method_index);
205 }
206 else if (tag == JVM_CONSTANT_MethodType) {
207 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
208 const u2 signature_index = cfs->get_u2_fast();
209 cp->method_type_index_at_put(index, signature_index);
210 }
211 else {
212 ShouldNotReachHere();
213 }
214 break;
215 }
216 case JVM_CONSTANT_Dynamic : {
217 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
218 classfile_parse_error(
219 "Class file version does not support constant tag %u in class file %s",
220 tag, CHECK);
221 }
222 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
223 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
224 const u2 name_and_type_index = cfs->get_u2_fast();
225 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
226 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
227 }
228 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
229 break;
230 }
231 case JVM_CONSTANT_InvokeDynamic : {
232 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
233 classfile_parse_error(
234 "Class file version does not support constant tag %u in class file %s",
235 tag, CHECK);
236 }
237 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
238 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
239 const u2 name_and_type_index = cfs->get_u2_fast();
240 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
241 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
242 }
243 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
244 break;
245 }
246 case JVM_CONSTANT_Integer: {
247 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
248 const u4 bytes = cfs->get_u4_fast();
249 cp->int_at_put(index, (jint)bytes);
250 break;
251 }
252 case JVM_CONSTANT_Float: {
253 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
254 const u4 bytes = cfs->get_u4_fast();
255 cp->float_at_put(index, *(jfloat*)&bytes);
256 break;
257 }
258 case JVM_CONSTANT_Long: {
259 // A mangled type might cause you to overrun allocated memory
260 guarantee_property(index + 1 < length,
261 "Invalid constant pool entry %u in class file %s",
262 index,
263 CHECK);
264 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
265 const u8 bytes = cfs->get_u8_fast();
266 cp->long_at_put(index, bytes);
267 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
268 break;
269 }
270 case JVM_CONSTANT_Double: {
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->double_at_put(index, *(jdouble*)&bytes);
279 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
280 break;
281 }
282 case JVM_CONSTANT_NameAndType: {
283 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
284 const u2 name_index = cfs->get_u2_fast();
285 const u2 signature_index = cfs->get_u2_fast();
286 cp->name_and_type_at_put(index, name_index, signature_index);
287 break;
288 }
289 case JVM_CONSTANT_Utf8 : {
290 cfs->guarantee_more(2, CHECK); // utf8_length
291 u2 utf8_length = cfs->get_u2_fast();
292 const u1* utf8_buffer = cfs->current();
293 assert(utf8_buffer != NULL, "null utf8 buffer");
294 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
295 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
296 cfs->skip_u1_fast(utf8_length);
297
298 // Before storing the symbol, make sure it's legal
299 if (_need_verify) {
300 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
301 }
302
303 if (has_cp_patch_at(index)) {
304 Handle patch = clear_cp_patch_at(index);
305 guarantee_property(java_lang_String::is_instance(patch()),
306 "Illegal utf8 patch at %d in class file %s",
307 index,
308 CHECK);
309 const char* const str = java_lang_String::as_utf8_string(patch());
310 // (could use java_lang_String::as_symbol instead, but might as well batch them)
311 utf8_buffer = (const u1*) str;
312 utf8_length = (int) strlen(str);
313 }
314
315 unsigned int hash;
316 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
317 utf8_length,
318 hash);
319 if (result == NULL) {
320 names[names_count] = (const char*)utf8_buffer;
321 lengths[names_count] = utf8_length;
322 indices[names_count] = index;
323 hashValues[names_count++] = hash;
324 if (names_count == SymbolTable::symbol_alloc_batch_size) {
325 SymbolTable::new_symbols(_loader_data,
326 cp,
327 names_count,
328 names,
329 lengths,
330 indices,
331 hashValues,
332 CHECK);
333 names_count = 0;
334 }
335 } else {
336 cp->symbol_at_put(index, result);
337 }
338 break;
339 }
340 case 19:
341 case 20: {
342 // Record that an error occurred in these two cases but keep parsing so
343 // that ACC_Module can be checked for in the access_flags. Need to
344 // throw NoClassDefFoundError in that case.
345 if (_major_version >= JAVA_9_VERSION) {
346 cfs->guarantee_more(3, CHECK);
347 cfs->get_u2_fast();
348 set_class_bad_constant_seen(tag);
349 break;
350 }
351 }
352 default: {
353 classfile_parse_error("Unknown constant tag %u in class file %s",
354 tag,
355 CHECK);
356 break;
357 }
358 } // end of switch(tag)
359 } // end of for
360
361 // Allocate the remaining symbols
362 if (names_count > 0) {
363 SymbolTable::new_symbols(_loader_data,
364 cp,
365 names_count,
366 names,
367 lengths,
368 indices,
369 hashValues,
370 CHECK);
371 }
372
373 // Copy _current pointer of local copy back to stream.
374 assert(stream->current() == old_current, "non-exclusive use of stream");
375 stream->set_current(cfs1.current());
376
377 }
378
379 static inline bool valid_cp_range(int index, int length) {
380 return (index > 0 && index < length);
381 }
382
383 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
384 assert(cp != NULL, "invariant");
385 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
386 return cp->symbol_at(index);
387 }
388 return NULL;
389 }
390
391 #ifdef ASSERT
392 PRAGMA_DIAG_PUSH
393 PRAGMA_FORMAT_NONLITERAL_IGNORED
394 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
395 ResourceMark rm(THREAD);
396 fatal(msg, _class_name->as_C_string());
397 }
398
399 void ClassFileParser::report_assert_property_failure(const char* msg,
400 int index,
401 TRAPS) const {
402 ResourceMark rm(THREAD);
403 fatal(msg, index, _class_name->as_C_string());
404 }
405 PRAGMA_DIAG_POP
406 #endif
407
408 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
409 ConstantPool* const cp,
410 const int length,
411 TRAPS) {
412 assert(cp != NULL, "invariant");
413 assert(stream != NULL, "invariant");
414
415 // parsing constant pool entries
416 parse_constant_pool_entries(stream, cp, length, CHECK);
417 if (class_bad_constant_seen() != 0) {
418 // a bad CP entry has been detected previously so stop parsing and just return.
419 return;
420 }
421
422 int index = 1; // declared outside of loops for portability
423 int num_klasses = 0;
424
425 // first verification pass - validate cross references
426 // and fixup class and string constants
427 for (index = 1; index < length; index++) { // Index 0 is unused
428 const jbyte tag = cp->tag_at(index).value();
429 switch (tag) {
430 case JVM_CONSTANT_Class: {
431 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
432 break;
433 }
434 case JVM_CONSTANT_Fieldref:
435 // fall through
436 case JVM_CONSTANT_Methodref:
437 // fall through
438 case JVM_CONSTANT_InterfaceMethodref: {
439 if (!_need_verify) break;
440 const int klass_ref_index = cp->klass_ref_index_at(index);
441 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
442 check_property(valid_klass_reference_at(klass_ref_index),
443 "Invalid constant pool index %u in class file %s",
444 klass_ref_index, CHECK);
445 check_property(valid_cp_range(name_and_type_ref_index, length) &&
446 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
447 "Invalid constant pool index %u in class file %s",
448 name_and_type_ref_index, CHECK);
449 break;
450 }
451 case JVM_CONSTANT_String: {
452 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
453 break;
454 }
455 case JVM_CONSTANT_Integer:
456 break;
457 case JVM_CONSTANT_Float:
458 break;
459 case JVM_CONSTANT_Long:
460 case JVM_CONSTANT_Double: {
461 index++;
462 check_property(
463 (index < length && cp->tag_at(index).is_invalid()),
464 "Improper constant pool long/double index %u in class file %s",
465 index, CHECK);
466 break;
467 }
468 case JVM_CONSTANT_NameAndType: {
469 if (!_need_verify) break;
470 const int name_ref_index = cp->name_ref_index_at(index);
471 const int signature_ref_index = cp->signature_ref_index_at(index);
472 check_property(valid_symbol_at(name_ref_index),
473 "Invalid constant pool index %u in class file %s",
474 name_ref_index, CHECK);
475 check_property(valid_symbol_at(signature_ref_index),
476 "Invalid constant pool index %u in class file %s",
477 signature_ref_index, CHECK);
478 break;
479 }
480 case JVM_CONSTANT_Utf8:
481 break;
482 case JVM_CONSTANT_UnresolvedClass: // fall-through
483 case JVM_CONSTANT_UnresolvedClassInError: {
484 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
485 break;
486 }
487 case JVM_CONSTANT_ClassIndex: {
488 const int class_index = cp->klass_index_at(index);
489 check_property(valid_symbol_at(class_index),
490 "Invalid constant pool index %u in class file %s",
491 class_index, CHECK);
492 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
493 break;
494 }
495 case JVM_CONSTANT_StringIndex: {
496 const int string_index = cp->string_index_at(index);
497 check_property(valid_symbol_at(string_index),
498 "Invalid constant pool index %u in class file %s",
499 string_index, CHECK);
500 Symbol* const sym = cp->symbol_at(string_index);
501 cp->unresolved_string_at_put(index, sym);
502 break;
503 }
504 case JVM_CONSTANT_MethodHandle: {
505 const int ref_index = cp->method_handle_index_at(index);
506 check_property(valid_cp_range(ref_index, length),
507 "Invalid constant pool index %u in class file %s",
508 ref_index, CHECK);
509 const constantTag tag = cp->tag_at(ref_index);
510 const int ref_kind = cp->method_handle_ref_kind_at(index);
511
512 switch (ref_kind) {
513 case JVM_REF_getField:
514 case JVM_REF_getStatic:
515 case JVM_REF_putField:
516 case JVM_REF_putStatic: {
517 check_property(
518 tag.is_field(),
519 "Invalid constant pool index %u in class file %s (not a field)",
520 ref_index, CHECK);
521 break;
522 }
523 case JVM_REF_invokeVirtual:
524 case JVM_REF_newInvokeSpecial: {
525 check_property(
526 tag.is_method(),
527 "Invalid constant pool index %u in class file %s (not a method)",
528 ref_index, CHECK);
529 break;
530 }
531 case JVM_REF_invokeStatic:
532 case JVM_REF_invokeSpecial: {
533 check_property(
534 tag.is_method() ||
535 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
536 "Invalid constant pool index %u in class file %s (not a method)",
537 ref_index, CHECK);
538 break;
539 }
540 case JVM_REF_invokeInterface: {
541 check_property(
542 tag.is_interface_method(),
543 "Invalid constant pool index %u in class file %s (not an interface method)",
544 ref_index, CHECK);
545 break;
546 }
547 default: {
548 classfile_parse_error(
549 "Bad method handle kind at constant pool index %u in class file %s",
550 index, CHECK);
551 }
552 } // switch(refkind)
553 // Keep the ref_index unchanged. It will be indirected at link-time.
554 break;
555 } // case MethodHandle
556 case JVM_CONSTANT_MethodType: {
557 const int ref_index = cp->method_type_index_at(index);
558 check_property(valid_symbol_at(ref_index),
559 "Invalid constant pool index %u in class file %s",
560 ref_index, CHECK);
561 break;
562 }
563 case JVM_CONSTANT_Dynamic: {
564 const int name_and_type_ref_index =
565 cp->invoke_dynamic_name_and_type_ref_index_at(index);
566
567 check_property(valid_cp_range(name_and_type_ref_index, length) &&
568 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
569 "Invalid constant pool index %u in class file %s",
570 name_and_type_ref_index, CHECK);
571 // bootstrap specifier index must be checked later,
572 // when BootstrapMethods attr is available
573
574 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
575 cp->set_has_dynamic_constant();
576 break;
577 }
578 case JVM_CONSTANT_InvokeDynamic: {
579 const int name_and_type_ref_index =
580 cp->invoke_dynamic_name_and_type_ref_index_at(index);
581
582 check_property(valid_cp_range(name_and_type_ref_index, length) &&
583 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
584 "Invalid constant pool index %u in class file %s",
585 name_and_type_ref_index, CHECK);
586 // bootstrap specifier index must be checked later,
587 // when BootstrapMethods attr is available
588 break;
589 }
590 default: {
591 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
592 ShouldNotReachHere();
593 break;
594 }
595 } // switch(tag)
596 } // end of for
597
598 _first_patched_klass_resolved_index = num_klasses;
599 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
600
601 if (_cp_patches != NULL) {
602 // need to treat this_class specially...
603
604 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
605 // for now. These will be replaced with actual names of the patched classes in patch_class().
606 Symbol* s = vmSymbols::star_name();
607 for (int n=_orig_cp_size; n<cp->length(); n++) {
608 cp->symbol_at_put(n, s);
609 }
610
611 int this_class_index;
612 {
613 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
614 const u1* const mark = stream->current();
615 stream->skip_u2_fast(1); // skip flags
616 this_class_index = stream->get_u2_fast();
617 stream->set_current(mark); // revert to mark
618 }
619
620 for (index = 1; index < length; index++) { // Index 0 is unused
621 if (has_cp_patch_at(index)) {
622 guarantee_property(index != this_class_index,
623 "Illegal constant pool patch to self at %d in class file %s",
624 index, CHECK);
625 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
626 }
627 }
628 }
629
630 if (!_need_verify) {
631 return;
632 }
633
634 // second verification pass - checks the strings are of the right format.
635 // but not yet to the other entries
636 for (index = 1; index < length; index++) {
637 const jbyte tag = cp->tag_at(index).value();
638 switch (tag) {
639 case JVM_CONSTANT_UnresolvedClass: {
640 const Symbol* const class_name = cp->klass_name_at(index);
641 // check the name, even if _cp_patches will overwrite it
642 verify_legal_class_name(class_name, CHECK);
643 break;
644 }
645 case JVM_CONSTANT_NameAndType: {
646 if (_need_verify) {
647 const int sig_index = cp->signature_ref_index_at(index);
648 const int name_index = cp->name_ref_index_at(index);
649 const Symbol* const name = cp->symbol_at(name_index);
650 const Symbol* const sig = cp->symbol_at(sig_index);
651 guarantee_property(sig->utf8_length() != 0,
652 "Illegal zero length constant pool entry at %d in class %s",
653 sig_index, CHECK);
654 guarantee_property(name->utf8_length() != 0,
655 "Illegal zero length constant pool entry at %d in class %s",
656 name_index, CHECK);
657
658 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
659 // Format check method name and signature
660 verify_legal_method_name(name, CHECK);
661 verify_legal_method_signature(name, sig, CHECK);
662 } else {
663 // Format check field name and signature
664 verify_legal_field_name(name, CHECK);
665 verify_legal_field_signature(name, sig, CHECK);
666 }
667 }
668 break;
669 }
670 case JVM_CONSTANT_Dynamic: {
671 const int name_and_type_ref_index =
672 cp->name_and_type_ref_index_at(index);
673 // already verified to be utf8
674 const int name_ref_index =
675 cp->name_ref_index_at(name_and_type_ref_index);
676 // already verified to be utf8
677 const int signature_ref_index =
678 cp->signature_ref_index_at(name_and_type_ref_index);
679 const Symbol* const name = cp->symbol_at(name_ref_index);
680 const Symbol* const signature = cp->symbol_at(signature_ref_index);
681 if (_need_verify) {
682 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
683 // Need only to be sure signature is non-zero length and the right type.
684 if (signature->utf8_length() == 0 ||
685 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
686 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
687 }
688 }
689 break;
690 }
691 case JVM_CONSTANT_InvokeDynamic:
692 case JVM_CONSTANT_Fieldref:
693 case JVM_CONSTANT_Methodref:
694 case JVM_CONSTANT_InterfaceMethodref: {
695 const int name_and_type_ref_index =
696 cp->name_and_type_ref_index_at(index);
697 // already verified to be utf8
698 const int name_ref_index =
699 cp->name_ref_index_at(name_and_type_ref_index);
700 // already verified to be utf8
701 const int signature_ref_index =
702 cp->signature_ref_index_at(name_and_type_ref_index);
703 const Symbol* const name = cp->symbol_at(name_ref_index);
704 const Symbol* const signature = cp->symbol_at(signature_ref_index);
705 if (tag == JVM_CONSTANT_Fieldref) {
706 if (_need_verify) {
707 // Field name and signature are verified above, when iterating NameAndType_info.
708 // Need only to be sure signature is non-zero length and the right type.
709 if (signature->utf8_length() == 0 ||
710 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
711 throwIllegalSignature("Field", name, signature, CHECK);
712 }
713 }
714 } else {
715 if (_need_verify) {
716 // Method name and signature are verified above, when iterating NameAndType_info.
717 // Need only to be sure signature is non-zero length and the right type.
718 if (signature->utf8_length() == 0 ||
719 signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
720 throwIllegalSignature("Method", name, signature, CHECK);
721 }
722 }
723 // 4509014: If a class method name begins with '<', it must be "<init>"
724 const unsigned int name_len = name->utf8_length();
725 if (tag == JVM_CONSTANT_Methodref &&
726 name_len != 0 &&
727 name->byte_at(0) == '<' &&
728 name != vmSymbols::object_initializer_name()) {
729 classfile_parse_error(
730 "Bad method name at constant pool index %u in class file %s",
731 name_ref_index, CHECK);
732 }
733 }
734 break;
735 }
736 case JVM_CONSTANT_MethodHandle: {
737 const int ref_index = cp->method_handle_index_at(index);
738 const int ref_kind = cp->method_handle_ref_kind_at(index);
739 switch (ref_kind) {
740 case JVM_REF_invokeVirtual:
741 case JVM_REF_invokeStatic:
742 case JVM_REF_invokeSpecial:
743 case JVM_REF_newInvokeSpecial: {
744 const int name_and_type_ref_index =
745 cp->name_and_type_ref_index_at(ref_index);
746 const int name_ref_index =
747 cp->name_ref_index_at(name_and_type_ref_index);
748 const Symbol* const name = cp->symbol_at(name_ref_index);
749 if (ref_kind == JVM_REF_newInvokeSpecial) {
750 if (name != vmSymbols::object_initializer_name()) {
751 classfile_parse_error(
752 "Bad constructor name at constant pool index %u in class file %s",
753 name_ref_index, CHECK);
754 }
755 } else {
756 if (name == vmSymbols::object_initializer_name()) {
757 classfile_parse_error(
758 "Bad method name at constant pool index %u in class file %s",
759 name_ref_index, CHECK);
760 }
761 }
762 break;
763 }
764 // Other ref_kinds are already fully checked in previous pass.
765 } // switch(ref_kind)
766 break;
767 }
768 case JVM_CONSTANT_MethodType: {
769 const Symbol* const no_name = vmSymbols::type_name(); // place holder
770 const Symbol* const signature = cp->method_type_signature_at(index);
771 verify_legal_method_signature(no_name, signature, CHECK);
772 break;
773 }
774 case JVM_CONSTANT_Utf8: {
775 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
776 }
777 } // switch(tag)
778 } // end of for
779 }
780
781 Handle ClassFileParser::clear_cp_patch_at(int index) {
782 Handle patch = cp_patch_at(index);
783 _cp_patches->at_put(index, Handle());
784 assert(!has_cp_patch_at(index), "");
785 return patch;
786 }
787
788 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
789 int name_index = _orig_cp_size + _num_patched_klasses;
790 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
791
792 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
793 _num_patched_klasses ++;
794 }
795
796 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
797 int index,
798 Handle patch,
799 TRAPS) {
800 assert(cp != NULL, "invariant");
801
802 BasicType patch_type = T_VOID;
803
804 switch (cp->tag_at(index).value()) {
805
806 case JVM_CONSTANT_UnresolvedClass: {
807 // Patching a class means pre-resolving it.
808 // The name in the constant pool is ignored.
809 if (java_lang_Class::is_instance(patch())) {
810 guarantee_property(!java_lang_Class::is_primitive(patch()),
811 "Illegal class patch at %d in class file %s",
812 index, CHECK);
813 Klass* k = java_lang_Class::as_Klass(patch());
814 patch_class(cp, index, k, k->name());
815 } else {
816 guarantee_property(java_lang_String::is_instance(patch()),
817 "Illegal class patch at %d in class file %s",
818 index, CHECK);
819 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK);
820 patch_class(cp, index, NULL, name);
821 }
822 break;
823 }
824
825 case JVM_CONSTANT_String: {
826 // skip this patch and don't clear it. Needs the oop array for resolved
827 // references to be created first.
828 return;
829 }
830 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
831 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
832 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
833 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
834 patch_prim:
835 {
836 jvalue value;
837 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
838 guarantee_property(value_type == patch_type,
839 "Illegal primitive patch at %d in class file %s",
840 index, CHECK);
841 switch (value_type) {
842 case T_INT: cp->int_at_put(index, value.i); break;
843 case T_FLOAT: cp->float_at_put(index, value.f); break;
844 case T_LONG: cp->long_at_put(index, value.j); break;
845 case T_DOUBLE: cp->double_at_put(index, value.d); break;
846 default: assert(false, "");
847 }
848 } // end patch_prim label
849 break;
850
851 default: {
852 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
853 guarantee_property(!has_cp_patch_at(index),
854 "Illegal unexpected patch at %d in class file %s",
855 index, CHECK);
856 return;
857 }
858 } // end of switch(tag)
859
860 // On fall-through, mark the patch as used.
861 clear_cp_patch_at(index);
862 }
863 class NameSigHash: public ResourceObj {
864 public:
865 const Symbol* _name; // name
866 const Symbol* _sig; // signature
867 NameSigHash* _next; // Next entry in hash table
868 };
869
870 static const int HASH_ROW_SIZE = 256;
871
872 static unsigned int hash(const Symbol* name, const Symbol* sig) {
873 unsigned int raw_hash = 0;
874 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
875 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
876
877 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
878 }
879
880
881 static void initialize_hashtable(NameSigHash** table) {
882 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
883 }
884 // Return false if the name/sig combination is found in table.
885 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
886 // The old format checker uses heap sort to find duplicates.
887 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
888 // of table since we don't expect Symbol*'s to move.
889 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
890 assert(name != NULL, "name in constant pool is NULL");
891
892 // First lookup for duplicates
893 int index = hash(name, sig);
894 NameSigHash* entry = table[index];
895 while (entry != NULL) {
896 if (entry->_name == name && entry->_sig == sig) {
897 return false;
898 }
899 entry = entry->_next;
900 }
901
902 // No duplicate is found, allocate a new entry and fill it.
903 entry = new NameSigHash();
904 entry->_name = name;
905 entry->_sig = sig;
906
907 // Insert into hash table
908 entry->_next = table[index];
909 table[index] = entry;
910
911 return true;
912 }
913
914 // Side-effects: populates the _local_interfaces field
915 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
916 const int itfs_len,
917 ConstantPool* const cp,
918 bool* const has_nonstatic_concrete_methods,
919 TRAPS) {
920 assert(stream != NULL, "invariant");
921 assert(cp != NULL, "invariant");
922 assert(has_nonstatic_concrete_methods != NULL, "invariant");
923
924 if (itfs_len == 0) {
925 _local_interfaces = Universe::the_empty_klass_array();
926 } else {
927 assert(itfs_len > 0, "only called for len>0");
928 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, itfs_len, NULL, CHECK);
929
930 int index;
931 for (index = 0; index < itfs_len; index++) {
932 const u2 interface_index = stream->get_u2(CHECK);
933 Klass* interf;
934 check_property(
935 valid_klass_reference_at(interface_index),
936 "Interface name has bad constant pool index %u in class file %s",
937 interface_index, CHECK);
938 if (cp->tag_at(interface_index).is_klass()) {
939 interf = cp->resolved_klass_at(interface_index);
940 } else {
941 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
942
943 // Don't need to check legal name because it's checked when parsing constant pool.
944 // But need to make sure it's not an array type.
945 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
946 "Bad interface name in class file %s", CHECK);
947
948 // Call resolve_super so classcircularity is checked
949 interf = SystemDictionary::resolve_super_or_fail(
950 _class_name,
951 unresolved_klass,
952 Handle(THREAD, _loader_data->class_loader()),
953 _protection_domain,
954 false,
955 CHECK);
956 }
957
958 if (!interf->is_interface()) {
959 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
960 err_msg("class %s can not implement %s, because it is not an interface (%s)",
961 _class_name->as_klass_external_name(),
962 interf->external_name(),
963 interf->class_in_module_of_loader()));
964 }
965
966 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
967 *has_nonstatic_concrete_methods = true;
968 }
969 _local_interfaces->at_put(index, interf);
970 }
971
972 if (!_need_verify || itfs_len <= 1) {
973 return;
974 }
975
976 // Check if there's any duplicates in interfaces
977 ResourceMark rm(THREAD);
978 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
979 NameSigHash*,
980 HASH_ROW_SIZE);
981 initialize_hashtable(interface_names);
982 bool dup = false;
983 const Symbol* name = NULL;
984 {
985 debug_only(NoSafepointVerifier nsv;)
986 for (index = 0; index < itfs_len; index++) {
987 const Klass* const k = _local_interfaces->at(index);
988 name = InstanceKlass::cast(k)->name();
989 // If no duplicates, add (name, NULL) in hashtable interface_names.
990 if (!put_after_lookup(name, NULL, interface_names)) {
991 dup = true;
992 break;
993 }
994 }
995 }
996 if (dup) {
997 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
998 name->as_C_string(), CHECK);
999 }
1000 }
1001 }
1002
1003 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
1004 int constantvalue_index,
1005 int signature_index,
1006 TRAPS) const {
1007 // Make sure the constant pool entry is of a type appropriate to this field
1008 guarantee_property(
1009 (constantvalue_index > 0 &&
1010 constantvalue_index < cp->length()),
1011 "Bad initial value index %u in ConstantValue attribute in class file %s",
1012 constantvalue_index, CHECK);
1013
1014 const constantTag value_type = cp->tag_at(constantvalue_index);
1015 switch(cp->basic_type_for_signature_at(signature_index)) {
1016 case T_LONG: {
1017 guarantee_property(value_type.is_long(),
1018 "Inconsistent constant value type in class file %s",
1019 CHECK);
1020 break;
1021 }
1022 case T_FLOAT: {
1023 guarantee_property(value_type.is_float(),
1024 "Inconsistent constant value type in class file %s",
1025 CHECK);
1026 break;
1027 }
1028 case T_DOUBLE: {
1029 guarantee_property(value_type.is_double(),
1030 "Inconsistent constant value type in class file %s",
1031 CHECK);
1032 break;
1033 }
1034 case T_BYTE:
1035 case T_CHAR:
1036 case T_SHORT:
1037 case T_BOOLEAN:
1038 case T_INT: {
1039 guarantee_property(value_type.is_int(),
1040 "Inconsistent constant value type in class file %s",
1041 CHECK);
1042 break;
1043 }
1044 case T_OBJECT: {
1045 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1046 && value_type.is_string()),
1047 "Bad string initial value in class file %s",
1048 CHECK);
1049 break;
1050 }
1051 default: {
1052 classfile_parse_error("Unable to set initial value %u in class file %s",
1053 constantvalue_index,
1054 CHECK);
1055 }
1056 }
1057 }
1058
1059 class AnnotationCollector : public ResourceObj{
1060 public:
1061 enum Location { _in_field, _in_method, _in_class };
1062 enum ID {
1063 _unknown = 0,
1064 _method_CallerSensitive,
1065 _method_ForceInline,
1066 _method_DontInline,
1067 _method_InjectedProfile,
1068 _method_LambdaForm_Compiled,
1069 _method_LambdaForm_Hidden,
1070 _method_HotSpotIntrinsicCandidate,
1071 _jdk_internal_vm_annotation_Contended,
1072 _field_Stable,
1073 _jdk_internal_vm_annotation_ReservedStackAccess,
1074 _annotation_LIMIT
1075 };
1076 const Location _location;
1077 int _annotations_present;
1078 u2 _contended_group;
1079
1080 AnnotationCollector(Location location)
1081 : _location(location), _annotations_present(0)
1082 {
1083 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1084 }
1085 // If this annotation name has an ID, report it (or _none).
1086 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1087 // Set the annotation name:
1088 void set_annotation(ID id) {
1089 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1090 _annotations_present |= nth_bit((int)id);
1091 }
1092
1093 void remove_annotation(ID id) {
1094 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1095 _annotations_present &= ~nth_bit((int)id);
1096 }
1097
1098 // Report if the annotation is present.
1099 bool has_any_annotations() const { return _annotations_present != 0; }
1100 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1101
1102 void set_contended_group(u2 group) { _contended_group = group; }
1103 u2 contended_group() const { return _contended_group; }
1104
1105 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1106
1107 void set_stable(bool stable) { set_annotation(_field_Stable); }
1108 bool is_stable() const { return has_annotation(_field_Stable); }
1109 };
1110
1111 // This class also doubles as a holder for metadata cleanup.
1112 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1113 private:
1114 ClassLoaderData* _loader_data;
1115 AnnotationArray* _field_annotations;
1116 AnnotationArray* _field_type_annotations;
1117 public:
1118 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1119 AnnotationCollector(_in_field),
1120 _loader_data(loader_data),
1121 _field_annotations(NULL),
1122 _field_type_annotations(NULL) {}
1123 ~FieldAnnotationCollector();
1124 void apply_to(FieldInfo* f);
1125 AnnotationArray* field_annotations() { return _field_annotations; }
1126 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1127
1128 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1129 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1130 };
1131
1132 class MethodAnnotationCollector : public AnnotationCollector{
1133 public:
1134 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1135 void apply_to(const methodHandle& m);
1136 };
1137
1138 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1139 public:
1140 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1141 void apply_to(InstanceKlass* ik);
1142 };
1143
1144
1145 static int skip_annotation_value(const u1*, int, int); // fwd decl
1146
1147 // Safely increment index by val if does not pass limit
1148 #define SAFE_ADD(index, limit, val) \
1149 if (index >= limit - val) return limit; \
1150 index += val;
1151
1152 // Skip an annotation. Return >=limit if there is any problem.
1153 static int skip_annotation(const u1* buffer, int limit, int index) {
1154 assert(buffer != NULL, "invariant");
1155 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1156 // value := switch (tag:u1) { ... }
1157 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1158 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1159 while (--nmem >= 0 && index < limit) {
1160 SAFE_ADD(index, limit, 2); // skip member
1161 index = skip_annotation_value(buffer, limit, index);
1162 }
1163 return index;
1164 }
1165
1166 // Skip an annotation value. Return >=limit if there is any problem.
1167 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1168 assert(buffer != NULL, "invariant");
1169
1170 // value := switch (tag:u1) {
1171 // case B, C, I, S, Z, D, F, J, c: con:u2;
1172 // case e: e_class:u2 e_name:u2;
1173 // case s: s_con:u2;
1174 // case [: do(nval:u2) {value};
1175 // case @: annotation;
1176 // case s: s_con:u2;
1177 // }
1178 SAFE_ADD(index, limit, 1); // read tag
1179 const u1 tag = buffer[index - 1];
1180 switch (tag) {
1181 case 'B':
1182 case 'C':
1183 case 'I':
1184 case 'S':
1185 case 'Z':
1186 case 'D':
1187 case 'F':
1188 case 'J':
1189 case 'c':
1190 case 's':
1191 SAFE_ADD(index, limit, 2); // skip con or s_con
1192 break;
1193 case 'e':
1194 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1195 break;
1196 case '[':
1197 {
1198 SAFE_ADD(index, limit, 2); // read nval
1199 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1200 while (--nval >= 0 && index < limit) {
1201 index = skip_annotation_value(buffer, limit, index);
1202 }
1203 }
1204 break;
1205 case '@':
1206 index = skip_annotation(buffer, limit, index);
1207 break;
1208 default:
1209 return limit; // bad tag byte
1210 }
1211 return index;
1212 }
1213
1214 // Sift through annotations, looking for those significant to the VM:
1215 static void parse_annotations(const ConstantPool* const cp,
1216 const u1* buffer, int limit,
1217 AnnotationCollector* coll,
1218 ClassLoaderData* loader_data,
1219 TRAPS) {
1220
1221 assert(cp != NULL, "invariant");
1222 assert(buffer != NULL, "invariant");
1223 assert(coll != NULL, "invariant");
1224 assert(loader_data != NULL, "invariant");
1225
1226 // annotations := do(nann:u2) {annotation}
1227 int index = 2; // read nann
1228 if (index >= limit) return;
1229 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1230 enum { // initial annotation layout
1231 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1232 count_off = 2, // u2 such as 1 (one value)
1233 member_off = 4, // utf8 such as 'value'
1234 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1235 e_tag_val = 'e',
1236 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1237 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1238 e_size = 11, // end of 'e' annotation
1239 c_tag_val = 'c', // payload is type
1240 c_con_off = 7, // utf8 payload, such as 'I'
1241 c_size = 9, // end of 'c' annotation
1242 s_tag_val = 's', // payload is String
1243 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1244 s_size = 9,
1245 min_size = 6 // smallest possible size (zero members)
1246 };
1247 // Cannot add min_size to index in case of overflow MAX_INT
1248 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1249 int index0 = index;
1250 index = skip_annotation(buffer, limit, index);
1251 const u1* const abase = buffer + index0;
1252 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1253 const int count = Bytes::get_Java_u2((address)abase + count_off);
1254 const Symbol* const aname = check_symbol_at(cp, atype);
1255 if (aname == NULL) break; // invalid annotation name
1256 const Symbol* member = NULL;
1257 if (count >= 1) {
1258 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1259 member = check_symbol_at(cp, member_index);
1260 if (member == NULL) break; // invalid member name
1261 }
1262
1263 // Here is where parsing particular annotations will take place.
1264 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1265 if (AnnotationCollector::_unknown == id) continue;
1266 coll->set_annotation(id);
1267
1268 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1269 // @Contended can optionally specify the contention group.
1270 //
1271 // Contended group defines the equivalence class over the fields:
1272 // the fields within the same contended group are not treated distinct.
1273 // The only exception is default group, which does not incur the
1274 // equivalence. Naturally, contention group for classes is meaningless.
1275 //
1276 // While the contention group is specified as String, annotation
1277 // values are already interned, and we might as well use the constant
1278 // pool index as the group tag.
1279 //
1280 u2 group_index = 0; // default contended group
1281 if (count == 1
1282 && s_size == (index - index0) // match size
1283 && s_tag_val == *(abase + tag_off)
1284 && member == vmSymbols::value_name()) {
1285 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1286 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1287 group_index = 0; // default contended group
1288 }
1289 }
1290 coll->set_contended_group(group_index);
1291 }
1292 }
1293 }
1294
1295
1296 // Parse attributes for a field.
1297 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1298 u2 attributes_count,
1299 bool is_static, u2 signature_index,
1300 u2* const constantvalue_index_addr,
1301 bool* const is_synthetic_addr,
1302 u2* const generic_signature_index_addr,
1303 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1304 TRAPS) {
1305 assert(cfs != NULL, "invariant");
1306 assert(constantvalue_index_addr != NULL, "invariant");
1307 assert(is_synthetic_addr != NULL, "invariant");
1308 assert(generic_signature_index_addr != NULL, "invariant");
1309 assert(parsed_annotations != NULL, "invariant");
1310 assert(attributes_count > 0, "attributes_count should be greater than 0");
1311
1312 u2 constantvalue_index = 0;
1313 u2 generic_signature_index = 0;
1314 bool is_synthetic = false;
1315 const u1* runtime_visible_annotations = NULL;
1316 int runtime_visible_annotations_length = 0;
1317 const u1* runtime_invisible_annotations = NULL;
1318 int runtime_invisible_annotations_length = 0;
1319 const u1* runtime_visible_type_annotations = NULL;
1320 int runtime_visible_type_annotations_length = 0;
1321 const u1* runtime_invisible_type_annotations = NULL;
1322 int runtime_invisible_type_annotations_length = 0;
1323 bool runtime_invisible_annotations_exists = false;
1324 bool runtime_invisible_type_annotations_exists = false;
1325 const ConstantPool* const cp = _cp;
1326
1327 while (attributes_count--) {
1328 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1329 const u2 attribute_name_index = cfs->get_u2_fast();
1330 const u4 attribute_length = cfs->get_u4_fast();
1331 check_property(valid_symbol_at(attribute_name_index),
1332 "Invalid field attribute index %u in class file %s",
1333 attribute_name_index,
1334 CHECK);
1335
1336 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1337 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1338 // ignore if non-static
1339 if (constantvalue_index != 0) {
1340 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1341 }
1342 check_property(
1343 attribute_length == 2,
1344 "Invalid ConstantValue field attribute length %u in class file %s",
1345 attribute_length, CHECK);
1346
1347 constantvalue_index = cfs->get_u2(CHECK);
1348 if (_need_verify) {
1349 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1350 }
1351 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1352 if (attribute_length != 0) {
1353 classfile_parse_error(
1354 "Invalid Synthetic field attribute length %u in class file %s",
1355 attribute_length, CHECK);
1356 }
1357 is_synthetic = true;
1358 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1359 if (attribute_length != 0) {
1360 classfile_parse_error(
1361 "Invalid Deprecated field attribute length %u in class file %s",
1362 attribute_length, CHECK);
1363 }
1364 } else if (_major_version >= JAVA_1_5_VERSION) {
1365 if (attribute_name == vmSymbols::tag_signature()) {
1366 if (generic_signature_index != 0) {
1367 classfile_parse_error(
1368 "Multiple Signature attributes for field in class file %s", CHECK);
1369 }
1370 if (attribute_length != 2) {
1371 classfile_parse_error(
1372 "Wrong size %u for field's Signature attribute in class file %s",
1373 attribute_length, CHECK);
1374 }
1375 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1376 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1377 if (runtime_visible_annotations != NULL) {
1378 classfile_parse_error(
1379 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1380 }
1381 runtime_visible_annotations_length = attribute_length;
1382 runtime_visible_annotations = cfs->current();
1383 assert(runtime_visible_annotations != NULL, "null visible annotations");
1384 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1385 parse_annotations(cp,
1386 runtime_visible_annotations,
1387 runtime_visible_annotations_length,
1388 parsed_annotations,
1389 _loader_data,
1390 CHECK);
1391 cfs->skip_u1_fast(runtime_visible_annotations_length);
1392 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1393 if (runtime_invisible_annotations_exists) {
1394 classfile_parse_error(
1395 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1396 }
1397 runtime_invisible_annotations_exists = true;
1398 if (PreserveAllAnnotations) {
1399 runtime_invisible_annotations_length = attribute_length;
1400 runtime_invisible_annotations = cfs->current();
1401 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1402 }
1403 cfs->skip_u1(attribute_length, CHECK);
1404 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1405 if (runtime_visible_type_annotations != NULL) {
1406 classfile_parse_error(
1407 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1408 }
1409 runtime_visible_type_annotations_length = attribute_length;
1410 runtime_visible_type_annotations = cfs->current();
1411 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1412 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1413 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1414 if (runtime_invisible_type_annotations_exists) {
1415 classfile_parse_error(
1416 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1417 } else {
1418 runtime_invisible_type_annotations_exists = true;
1419 }
1420 if (PreserveAllAnnotations) {
1421 runtime_invisible_type_annotations_length = attribute_length;
1422 runtime_invisible_type_annotations = cfs->current();
1423 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1424 }
1425 cfs->skip_u1(attribute_length, CHECK);
1426 } else {
1427 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1428 }
1429 } else {
1430 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1431 }
1432 }
1433
1434 *constantvalue_index_addr = constantvalue_index;
1435 *is_synthetic_addr = is_synthetic;
1436 *generic_signature_index_addr = generic_signature_index;
1437 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1438 runtime_visible_annotations_length,
1439 runtime_invisible_annotations,
1440 runtime_invisible_annotations_length,
1441 CHECK);
1442 parsed_annotations->set_field_annotations(a);
1443 a = assemble_annotations(runtime_visible_type_annotations,
1444 runtime_visible_type_annotations_length,
1445 runtime_invisible_type_annotations,
1446 runtime_invisible_type_annotations_length,
1447 CHECK);
1448 parsed_annotations->set_field_type_annotations(a);
1449 return;
1450 }
1451
1452
1453 // Field allocation types. Used for computing field offsets.
1454
1455 enum FieldAllocationType {
1456 STATIC_OOP, // Oops
1457 STATIC_BYTE, // Boolean, Byte, char
1458 STATIC_SHORT, // shorts
1459 STATIC_WORD, // ints
1460 STATIC_DOUBLE, // aligned long or double
1461 NONSTATIC_OOP,
1462 NONSTATIC_BYTE,
1463 NONSTATIC_SHORT,
1464 NONSTATIC_WORD,
1465 NONSTATIC_DOUBLE,
1466 MAX_FIELD_ALLOCATION_TYPE,
1467 BAD_ALLOCATION_TYPE = -1
1468 };
1469
1470 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1471 BAD_ALLOCATION_TYPE, // 0
1472 BAD_ALLOCATION_TYPE, // 1
1473 BAD_ALLOCATION_TYPE, // 2
1474 BAD_ALLOCATION_TYPE, // 3
1475 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1476 NONSTATIC_SHORT, // T_CHAR = 5,
1477 NONSTATIC_WORD, // T_FLOAT = 6,
1478 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1479 NONSTATIC_BYTE, // T_BYTE = 8,
1480 NONSTATIC_SHORT, // T_SHORT = 9,
1481 NONSTATIC_WORD, // T_INT = 10,
1482 NONSTATIC_DOUBLE, // T_LONG = 11,
1483 NONSTATIC_OOP, // T_OBJECT = 12,
1484 NONSTATIC_OOP, // T_ARRAY = 13,
1485 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1486 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1487 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1488 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1489 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1490 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1491 BAD_ALLOCATION_TYPE, // 0
1492 BAD_ALLOCATION_TYPE, // 1
1493 BAD_ALLOCATION_TYPE, // 2
1494 BAD_ALLOCATION_TYPE, // 3
1495 STATIC_BYTE , // T_BOOLEAN = 4,
1496 STATIC_SHORT, // T_CHAR = 5,
1497 STATIC_WORD, // T_FLOAT = 6,
1498 STATIC_DOUBLE, // T_DOUBLE = 7,
1499 STATIC_BYTE, // T_BYTE = 8,
1500 STATIC_SHORT, // T_SHORT = 9,
1501 STATIC_WORD, // T_INT = 10,
1502 STATIC_DOUBLE, // T_LONG = 11,
1503 STATIC_OOP, // T_OBJECT = 12,
1504 STATIC_OOP, // T_ARRAY = 13,
1505 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1506 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1507 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1508 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1509 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1510 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1511 };
1512
1513 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1514 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1515 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1516 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1517 return result;
1518 }
1519
1520 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1521 public:
1522 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1523
1524 FieldAllocationCount() {
1525 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1526 count[i] = 0;
1527 }
1528 }
1529
1530 FieldAllocationType update(bool is_static, BasicType type) {
1531 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1532 if (atype != BAD_ALLOCATION_TYPE) {
1533 // Make sure there is no overflow with injected fields.
1534 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1535 count[atype]++;
1536 }
1537 return atype;
1538 }
1539 };
1540
1541 // Side-effects: populates the _fields, _fields_annotations,
1542 // _fields_type_annotations fields
1543 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1544 bool is_interface,
1545 FieldAllocationCount* const fac,
1546 ConstantPool* cp,
1547 const int cp_size,
1548 u2* const java_fields_count_ptr,
1549 TRAPS) {
1550
1551 assert(cfs != NULL, "invariant");
1552 assert(fac != NULL, "invariant");
1553 assert(cp != NULL, "invariant");
1554 assert(java_fields_count_ptr != NULL, "invariant");
1555
1556 assert(NULL == _fields, "invariant");
1557 assert(NULL == _fields_annotations, "invariant");
1558 assert(NULL == _fields_type_annotations, "invariant");
1559
1560 cfs->guarantee_more(2, CHECK); // length
1561 const u2 length = cfs->get_u2_fast();
1562 *java_fields_count_ptr = length;
1563
1564 int num_injected = 0;
1565 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1566 &num_injected);
1567 const int total_fields = length + num_injected;
1568
1569 // The field array starts with tuples of shorts
1570 // [access, name index, sig index, initial value index, byte offset].
1571 // A generic signature slot only exists for field with generic
1572 // signature attribute. And the access flag is set with
1573 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1574 // signature slots are at the end of the field array and after all
1575 // other fields data.
1576 //
1577 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1578 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1579 // ...
1580 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1581 // [generic signature index]
1582 // [generic signature index]
1583 // ...
1584 //
1585 // Allocate a temporary resource array for field data. For each field,
1586 // a slot is reserved in the temporary array for the generic signature
1587 // index. After parsing all fields, the data are copied to a permanent
1588 // array and any unused slots will be discarded.
1589 ResourceMark rm(THREAD);
1590 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1591 u2,
1592 total_fields * (FieldInfo::field_slots + 1));
1593
1594 // The generic signature slots start after all other fields' data.
1595 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1596 int num_generic_signature = 0;
1597 for (int n = 0; n < length; n++) {
1598 // access_flags, name_index, descriptor_index, attributes_count
1599 cfs->guarantee_more(8, CHECK);
1600
1601 AccessFlags access_flags;
1602 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1603 verify_legal_field_modifiers(flags, is_interface, CHECK);
1604 access_flags.set_flags(flags);
1605
1606 const u2 name_index = cfs->get_u2_fast();
1607 check_property(valid_symbol_at(name_index),
1608 "Invalid constant pool index %u for field name in class file %s",
1609 name_index, CHECK);
1610 const Symbol* const name = cp->symbol_at(name_index);
1611 verify_legal_field_name(name, CHECK);
1612
1613 const u2 signature_index = cfs->get_u2_fast();
1614 check_property(valid_symbol_at(signature_index),
1615 "Invalid constant pool index %u for field signature in class file %s",
1616 signature_index, CHECK);
1617 const Symbol* const sig = cp->symbol_at(signature_index);
1618 verify_legal_field_signature(name, sig, CHECK);
1619
1620 u2 constantvalue_index = 0;
1621 bool is_synthetic = false;
1622 u2 generic_signature_index = 0;
1623 const bool is_static = access_flags.is_static();
1624 FieldAnnotationCollector parsed_annotations(_loader_data);
1625
1626 const u2 attributes_count = cfs->get_u2_fast();
1627 if (attributes_count > 0) {
1628 parse_field_attributes(cfs,
1629 attributes_count,
1630 is_static,
1631 signature_index,
1632 &constantvalue_index,
1633 &is_synthetic,
1634 &generic_signature_index,
1635 &parsed_annotations,
1636 CHECK);
1637
1638 if (parsed_annotations.field_annotations() != NULL) {
1639 if (_fields_annotations == NULL) {
1640 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1641 _loader_data, length, NULL,
1642 CHECK);
1643 }
1644 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1645 parsed_annotations.set_field_annotations(NULL);
1646 }
1647 if (parsed_annotations.field_type_annotations() != NULL) {
1648 if (_fields_type_annotations == NULL) {
1649 _fields_type_annotations =
1650 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1651 length,
1652 NULL,
1653 CHECK);
1654 }
1655 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1656 parsed_annotations.set_field_type_annotations(NULL);
1657 }
1658
1659 if (is_synthetic) {
1660 access_flags.set_is_synthetic();
1661 }
1662 if (generic_signature_index != 0) {
1663 access_flags.set_field_has_generic_signature();
1664 fa[generic_signature_slot] = generic_signature_index;
1665 generic_signature_slot ++;
1666 num_generic_signature ++;
1667 }
1668 }
1669
1670 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1671 field->initialize(access_flags.as_short(),
1672 name_index,
1673 signature_index,
1674 constantvalue_index);
1675 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1676
1677 // Remember how many oops we encountered and compute allocation type
1678 const FieldAllocationType atype = fac->update(is_static, type);
1679 field->set_allocation_type(atype);
1680
1681 // After field is initialized with type, we can augment it with aux info
1682 if (parsed_annotations.has_any_annotations())
1683 parsed_annotations.apply_to(field);
1684 }
1685
1686 int index = length;
1687 if (num_injected != 0) {
1688 for (int n = 0; n < num_injected; n++) {
1689 // Check for duplicates
1690 if (injected[n].may_be_java) {
1691 const Symbol* const name = injected[n].name();
1692 const Symbol* const signature = injected[n].signature();
1693 bool duplicate = false;
1694 for (int i = 0; i < length; i++) {
1695 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1696 if (name == cp->symbol_at(f->name_index()) &&
1697 signature == cp->symbol_at(f->signature_index())) {
1698 // Symbol is desclared in Java so skip this one
1699 duplicate = true;
1700 break;
1701 }
1702 }
1703 if (duplicate) {
1704 // These will be removed from the field array at the end
1705 continue;
1706 }
1707 }
1708
1709 // Injected field
1710 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1711 field->initialize(JVM_ACC_FIELD_INTERNAL,
1712 injected[n].name_index,
1713 injected[n].signature_index,
1714 0);
1715
1716 const BasicType type = FieldType::basic_type(injected[n].signature());
1717
1718 // Remember how many oops we encountered and compute allocation type
1719 const FieldAllocationType atype = fac->update(false, type);
1720 field->set_allocation_type(atype);
1721 index++;
1722 }
1723 }
1724
1725 assert(NULL == _fields, "invariant");
1726
1727 _fields =
1728 MetadataFactory::new_array<u2>(_loader_data,
1729 index * FieldInfo::field_slots + num_generic_signature,
1730 CHECK);
1731 // Sometimes injected fields already exist in the Java source so
1732 // the fields array could be too long. In that case the
1733 // fields array is trimed. Also unused slots that were reserved
1734 // for generic signature indexes are discarded.
1735 {
1736 int i = 0;
1737 for (; i < index * FieldInfo::field_slots; i++) {
1738 _fields->at_put(i, fa[i]);
1739 }
1740 for (int j = total_fields * FieldInfo::field_slots;
1741 j < generic_signature_slot; j++) {
1742 _fields->at_put(i++, fa[j]);
1743 }
1744 assert(_fields->length() == i, "");
1745 }
1746
1747 if (_need_verify && length > 1) {
1748 // Check duplicated fields
1749 ResourceMark rm(THREAD);
1750 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1751 THREAD, NameSigHash*, HASH_ROW_SIZE);
1752 initialize_hashtable(names_and_sigs);
1753 bool dup = false;
1754 const Symbol* name = NULL;
1755 const Symbol* sig = NULL;
1756 {
1757 debug_only(NoSafepointVerifier nsv;)
1758 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1759 name = fs.name();
1760 sig = fs.signature();
1761 // If no duplicates, add name/signature in hashtable names_and_sigs.
1762 if (!put_after_lookup(name, sig, names_and_sigs)) {
1763 dup = true;
1764 break;
1765 }
1766 }
1767 }
1768 if (dup) {
1769 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1770 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1771 }
1772 }
1773 }
1774
1775
1776 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1777 u4 code_length,
1778 u4 exception_table_length,
1779 TRAPS) {
1780 assert(cfs != NULL, "invariant");
1781
1782 const unsafe_u2* const exception_table_start = cfs->current();
1783 assert(exception_table_start != NULL, "null exception table");
1784
1785 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1786 // end_pc,
1787 // handler_pc,
1788 // catch_type_index
1789
1790 // Will check legal target after parsing code array in verifier.
1791 if (_need_verify) {
1792 for (unsigned int i = 0; i < exception_table_length; i++) {
1793 const u2 start_pc = cfs->get_u2_fast();
1794 const u2 end_pc = cfs->get_u2_fast();
1795 const u2 handler_pc = cfs->get_u2_fast();
1796 const u2 catch_type_index = cfs->get_u2_fast();
1797 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1798 "Illegal exception table range in class file %s",
1799 CHECK_NULL);
1800 guarantee_property(handler_pc < code_length,
1801 "Illegal exception table handler in class file %s",
1802 CHECK_NULL);
1803 if (catch_type_index != 0) {
1804 guarantee_property(valid_klass_reference_at(catch_type_index),
1805 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1806 }
1807 }
1808 } else {
1809 cfs->skip_u2_fast(exception_table_length * 4);
1810 }
1811 return exception_table_start;
1812 }
1813
1814 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1815 u4 code_length,
1816 CompressedLineNumberWriteStream**const write_stream,
1817 TRAPS) {
1818
1819 const ClassFileStream* const cfs = _stream;
1820 unsigned int num_entries = cfs->get_u2(CHECK);
1821
1822 // Each entry is a u2 start_pc, and a u2 line_number
1823 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1824
1825 // Verify line number attribute and table length
1826 check_property(
1827 code_attribute_length == sizeof(u2) + length_in_bytes,
1828 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1829
1830 cfs->guarantee_more(length_in_bytes, CHECK);
1831
1832 if ((*write_stream) == NULL) {
1833 if (length_in_bytes > fixed_buffer_size) {
1834 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1835 } else {
1836 (*write_stream) = new CompressedLineNumberWriteStream(
1837 _linenumbertable_buffer, fixed_buffer_size);
1838 }
1839 }
1840
1841 while (num_entries-- > 0) {
1842 const u2 bci = cfs->get_u2_fast(); // start_pc
1843 const u2 line = cfs->get_u2_fast(); // line_number
1844 guarantee_property(bci < code_length,
1845 "Invalid pc in LineNumberTable in class file %s", CHECK);
1846 (*write_stream)->write_pair(bci, line);
1847 }
1848 }
1849
1850
1851 class LVT_Hash : public AllStatic {
1852 public:
1853
1854 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1855 /*
1856 * 3-tuple start_bci/length/slot has to be unique key,
1857 * so the following comparison seems to be redundant:
1858 * && elem->name_cp_index == entry->_elem->name_cp_index
1859 */
1860 return (e0.start_bci == e1.start_bci &&
1861 e0.length == e1.length &&
1862 e0.name_cp_index == e1.name_cp_index &&
1863 e0.slot == e1.slot);
1864 }
1865
1866 static unsigned int hash(LocalVariableTableElement const& e0) {
1867 unsigned int raw_hash = e0.start_bci;
1868
1869 raw_hash = e0.length + raw_hash * 37;
1870 raw_hash = e0.name_cp_index + raw_hash * 37;
1871 raw_hash = e0.slot + raw_hash * 37;
1872
1873 return raw_hash;
1874 }
1875 };
1876
1877
1878 // Class file LocalVariableTable elements.
1879 class Classfile_LVT_Element {
1880 public:
1881 u2 start_bci;
1882 u2 length;
1883 u2 name_cp_index;
1884 u2 descriptor_cp_index;
1885 u2 slot;
1886 };
1887
1888 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1889 LocalVariableTableElement* const lvt) {
1890 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1891 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1892 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1893 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1894 lvt->signature_cp_index = 0;
1895 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1896 }
1897
1898 // Function is used to parse both attributes:
1899 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1900 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1901 u4 code_length,
1902 u2 max_locals,
1903 u4 code_attribute_length,
1904 u2* const localvariable_table_length,
1905 bool isLVTT,
1906 TRAPS) {
1907 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1908 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1909 const unsigned int size =
1910 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1911
1912 const ConstantPool* const cp = _cp;
1913
1914 // Verify local variable table attribute has right length
1915 if (_need_verify) {
1916 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1917 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1918 }
1919
1920 const unsafe_u2* const localvariable_table_start = cfs->current();
1921 assert(localvariable_table_start != NULL, "null local variable table");
1922 if (!_need_verify) {
1923 cfs->skip_u2_fast(size);
1924 } else {
1925 cfs->guarantee_more(size * 2, CHECK_NULL);
1926 for(int i = 0; i < (*localvariable_table_length); i++) {
1927 const u2 start_pc = cfs->get_u2_fast();
1928 const u2 length = cfs->get_u2_fast();
1929 const u2 name_index = cfs->get_u2_fast();
1930 const u2 descriptor_index = cfs->get_u2_fast();
1931 const u2 index = cfs->get_u2_fast();
1932 // Assign to a u4 to avoid overflow
1933 const u4 end_pc = (u4)start_pc + (u4)length;
1934
1935 if (start_pc >= code_length) {
1936 classfile_parse_error(
1937 "Invalid start_pc %u in %s in class file %s",
1938 start_pc, tbl_name, CHECK_NULL);
1939 }
1940 if (end_pc > code_length) {
1941 classfile_parse_error(
1942 "Invalid length %u in %s in class file %s",
1943 length, tbl_name, CHECK_NULL);
1944 }
1945 const int cp_size = cp->length();
1946 guarantee_property(valid_symbol_at(name_index),
1947 "Name index %u in %s has bad constant type in class file %s",
1948 name_index, tbl_name, CHECK_NULL);
1949 guarantee_property(valid_symbol_at(descriptor_index),
1950 "Signature index %u in %s has bad constant type in class file %s",
1951 descriptor_index, tbl_name, CHECK_NULL);
1952
1953 const Symbol* const name = cp->symbol_at(name_index);
1954 const Symbol* const sig = cp->symbol_at(descriptor_index);
1955 verify_legal_field_name(name, CHECK_NULL);
1956 u2 extra_slot = 0;
1957 if (!isLVTT) {
1958 verify_legal_field_signature(name, sig, CHECK_NULL);
1959
1960 // 4894874: check special cases for double and long local variables
1961 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1962 sig == vmSymbols::type_signature(T_LONG)) {
1963 extra_slot = 1;
1964 }
1965 }
1966 guarantee_property((index + extra_slot) < max_locals,
1967 "Invalid index %u in %s in class file %s",
1968 index, tbl_name, CHECK_NULL);
1969 }
1970 }
1971 return localvariable_table_start;
1972 }
1973
1974
1975 void ClassFileParser::parse_type_array(u2 array_length,
1976 u4 code_length,
1977 u4* const u1_index,
1978 u4* const u2_index,
1979 u1* const u1_array,
1980 u2* const u2_array,
1981 TRAPS) {
1982 const ClassFileStream* const cfs = _stream;
1983 u2 index = 0; // index in the array with long/double occupying two slots
1984 u4 i1 = *u1_index;
1985 u4 i2 = *u2_index + 1;
1986 for(int i = 0; i < array_length; i++) {
1987 const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1988 index++;
1989 if (tag == ITEM_Long || tag == ITEM_Double) {
1990 index++;
1991 } else if (tag == ITEM_Object) {
1992 const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1993 guarantee_property(valid_klass_reference_at(class_index),
1994 "Bad class index %u in StackMap in class file %s",
1995 class_index, CHECK);
1996 } else if (tag == ITEM_Uninitialized) {
1997 const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1998 guarantee_property(
1999 offset < code_length,
2000 "Bad uninitialized type offset %u in StackMap in class file %s",
2001 offset, CHECK);
2002 } else {
2003 guarantee_property(
2004 tag <= (u1)ITEM_Uninitialized,
2005 "Unknown variable type %u in StackMap in class file %s",
2006 tag, CHECK);
2007 }
2008 }
2009 u2_array[*u2_index] = index;
2010 *u1_index = i1;
2011 *u2_index = i2;
2012 }
2013
2014 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
2015 u4 code_attribute_length,
2016 bool need_verify,
2017 TRAPS) {
2018 assert(cfs != NULL, "invariant");
2019
2020 if (0 == code_attribute_length) {
2021 return NULL;
2022 }
2023
2024 const u1* const stackmap_table_start = cfs->current();
2025 assert(stackmap_table_start != NULL, "null stackmap table");
2026
2027 // check code_attribute_length first
2028 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2029
2030 if (!need_verify && !DumpSharedSpaces) {
2031 return NULL;
2032 }
2033 return stackmap_table_start;
2034 }
2035
2036 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2037 u2* const checked_exceptions_length,
2038 u4 method_attribute_length,
2039 TRAPS) {
2040 assert(cfs != NULL, "invariant");
2041 assert(checked_exceptions_length != NULL, "invariant");
2042
2043 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2044 *checked_exceptions_length = cfs->get_u2_fast();
2045 const unsigned int size =
2046 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2047 const unsafe_u2* const checked_exceptions_start = cfs->current();
2048 assert(checked_exceptions_start != NULL, "null checked exceptions");
2049 if (!_need_verify) {
2050 cfs->skip_u2_fast(size);
2051 } else {
2052 // Verify each value in the checked exception table
2053 u2 checked_exception;
2054 const u2 len = *checked_exceptions_length;
2055 cfs->guarantee_more(2 * len, CHECK_NULL);
2056 for (int i = 0; i < len; i++) {
2057 checked_exception = cfs->get_u2_fast();
2058 check_property(
2059 valid_klass_reference_at(checked_exception),
2060 "Exception name has bad type at constant pool %u in class file %s",
2061 checked_exception, CHECK_NULL);
2062 }
2063 }
2064 // check exceptions attribute length
2065 if (_need_verify) {
2066 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2067 sizeof(u2) * size),
2068 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2069 }
2070 return checked_exceptions_start;
2071 }
2072
2073 void ClassFileParser::throwIllegalSignature(const char* type,
2074 const Symbol* name,
2075 const Symbol* sig,
2076 TRAPS) const {
2077 assert(name != NULL, "invariant");
2078 assert(sig != NULL, "invariant");
2079
2080 ResourceMark rm(THREAD);
2081 Exceptions::fthrow(THREAD_AND_LOCATION,
2082 vmSymbols::java_lang_ClassFormatError(),
2083 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2084 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2085 }
2086
2087 AnnotationCollector::ID
2088 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2089 const Symbol* name) {
2090 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2091 // Privileged code can use all annotations. Other code silently drops some.
2092 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2093 loader_data->is_platform_class_loader_data() ||
2094 loader_data->is_anonymous();
2095 switch (sid) {
2096 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2097 if (_location != _in_method) break; // only allow for methods
2098 if (!privileged) break; // only allow in privileged code
2099 return _method_CallerSensitive;
2100 }
2101 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2102 if (_location != _in_method) break; // only allow for methods
2103 if (!privileged) break; // only allow in privileged code
2104 return _method_ForceInline;
2105 }
2106 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2107 if (_location != _in_method) break; // only allow for methods
2108 if (!privileged) break; // only allow in privileged code
2109 return _method_DontInline;
2110 }
2111 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2112 if (_location != _in_method) break; // only allow for methods
2113 if (!privileged) break; // only allow in privileged code
2114 return _method_InjectedProfile;
2115 }
2116 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2117 if (_location != _in_method) break; // only allow for methods
2118 if (!privileged) break; // only allow in privileged code
2119 return _method_LambdaForm_Compiled;
2120 }
2121 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): {
2122 if (_location != _in_method) break; // only allow for methods
2123 if (!privileged) break; // only allow in privileged code
2124 return _method_LambdaForm_Hidden;
2125 }
2126 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2127 if (_location != _in_method) break; // only allow for methods
2128 if (!privileged) break; // only allow in privileged code
2129 return _method_HotSpotIntrinsicCandidate;
2130 }
2131 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2132 if (_location != _in_field) break; // only allow for fields
2133 if (!privileged) break; // only allow in privileged code
2134 return _field_Stable;
2135 }
2136 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2137 if (_location != _in_field && _location != _in_class) {
2138 break; // only allow for fields and classes
2139 }
2140 if (!EnableContended || (RestrictContended && !privileged)) {
2141 break; // honor privileges
2142 }
2143 return _jdk_internal_vm_annotation_Contended;
2144 }
2145 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2146 if (_location != _in_method) break; // only allow for methods
2147 if (RestrictReservedStack && !privileged) break; // honor privileges
2148 return _jdk_internal_vm_annotation_ReservedStackAccess;
2149 }
2150 default: {
2151 break;
2152 }
2153 }
2154 return AnnotationCollector::_unknown;
2155 }
2156
2157 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2158 if (is_contended())
2159 f->set_contended_group(contended_group());
2160 if (is_stable())
2161 f->set_stable(true);
2162 }
2163
2164 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2165 // If there's an error deallocate metadata for field annotations
2166 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2167 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2168 }
2169
2170 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2171 if (has_annotation(_method_CallerSensitive))
2172 m->set_caller_sensitive(true);
2173 if (has_annotation(_method_ForceInline))
2174 m->set_force_inline(true);
2175 if (has_annotation(_method_DontInline))
2176 m->set_dont_inline(true);
2177 if (has_annotation(_method_InjectedProfile))
2178 m->set_has_injected_profile(true);
2179 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2180 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2181 if (has_annotation(_method_LambdaForm_Hidden))
2182 m->set_hidden(true);
2183 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2184 m->set_intrinsic_candidate(true);
2185 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2186 m->set_has_reserved_stack_access(true);
2187 }
2188
2189 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2190 assert(ik != NULL, "invariant");
2191 ik->set_is_contended(is_contended());
2192 }
2193
2194 #define MAX_ARGS_SIZE 255
2195 #define MAX_CODE_SIZE 65535
2196 #define INITIAL_MAX_LVT_NUMBER 256
2197
2198 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2199 *
2200 * Rules for LVT's and LVTT's are:
2201 * - There can be any number of LVT's and LVTT's.
2202 * - If there are n LVT's, it is the same as if there was just
2203 * one LVT containing all the entries from the n LVT's.
2204 * - There may be no more than one LVT entry per local variable.
2205 * Two LVT entries are 'equal' if these fields are the same:
2206 * start_pc, length, name, slot
2207 * - There may be no more than one LVTT entry per each LVT entry.
2208 * Each LVTT entry has to match some LVT entry.
2209 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2210 */
2211 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2212 int lvt_cnt,
2213 u2* const localvariable_table_length,
2214 const unsafe_u2** const localvariable_table_start,
2215 int lvtt_cnt,
2216 u2* const localvariable_type_table_length,
2217 const unsafe_u2** const localvariable_type_table_start,
2218 TRAPS) {
2219
2220 ResourceMark rm(THREAD);
2221
2222 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2223 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2224
2225 LVT_HashTable* const table = new LVT_HashTable();
2226
2227 // To fill LocalVariableTable in
2228 const Classfile_LVT_Element* cf_lvt;
2229 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2230
2231 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2232 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2233 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2234 copy_lvt_element(&cf_lvt[idx], lvt);
2235 // If no duplicates, add LVT elem in hashtable.
2236 if (table->put(*lvt, lvt) == false
2237 && _need_verify
2238 && _major_version >= JAVA_1_5_VERSION) {
2239 classfile_parse_error("Duplicated LocalVariableTable attribute "
2240 "entry for '%s' in class file %s",
2241 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2242 CHECK);
2243 }
2244 }
2245 }
2246
2247 // To merge LocalVariableTable and LocalVariableTypeTable
2248 const Classfile_LVT_Element* cf_lvtt;
2249 LocalVariableTableElement lvtt_elem;
2250
2251 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2252 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2253 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2254 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2255 LocalVariableTableElement** entry = table->get(lvtt_elem);
2256 if (entry == NULL) {
2257 if (_need_verify) {
2258 classfile_parse_error("LVTT entry for '%s' in class file %s "
2259 "does not match any LVT entry",
2260 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2261 CHECK);
2262 }
2263 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2264 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2265 "entry for '%s' in class file %s",
2266 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2267 CHECK);
2268 } else {
2269 // to add generic signatures into LocalVariableTable
2270 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2271 }
2272 }
2273 }
2274 }
2275
2276
2277 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2278 const u1* runtime_visible_annotations,
2279 int runtime_visible_annotations_length,
2280 const u1* runtime_invisible_annotations,
2281 int runtime_invisible_annotations_length,
2282 const u1* runtime_visible_parameter_annotations,
2283 int runtime_visible_parameter_annotations_length,
2284 const u1* runtime_invisible_parameter_annotations,
2285 int runtime_invisible_parameter_annotations_length,
2286 const u1* runtime_visible_type_annotations,
2287 int runtime_visible_type_annotations_length,
2288 const u1* runtime_invisible_type_annotations,
2289 int runtime_invisible_type_annotations_length,
2290 const u1* annotation_default,
2291 int annotation_default_length,
2292 TRAPS) {
2293
2294 AnnotationArray* a;
2295
2296 if (runtime_visible_annotations_length +
2297 runtime_invisible_annotations_length > 0) {
2298 a = assemble_annotations(runtime_visible_annotations,
2299 runtime_visible_annotations_length,
2300 runtime_invisible_annotations,
2301 runtime_invisible_annotations_length,
2302 CHECK);
2303 cm->set_method_annotations(a);
2304 }
2305
2306 if (runtime_visible_parameter_annotations_length +
2307 runtime_invisible_parameter_annotations_length > 0) {
2308 a = assemble_annotations(runtime_visible_parameter_annotations,
2309 runtime_visible_parameter_annotations_length,
2310 runtime_invisible_parameter_annotations,
2311 runtime_invisible_parameter_annotations_length,
2312 CHECK);
2313 cm->set_parameter_annotations(a);
2314 }
2315
2316 if (annotation_default_length > 0) {
2317 a = assemble_annotations(annotation_default,
2318 annotation_default_length,
2319 NULL,
2320 0,
2321 CHECK);
2322 cm->set_default_annotations(a);
2323 }
2324
2325 if (runtime_visible_type_annotations_length +
2326 runtime_invisible_type_annotations_length > 0) {
2327 a = assemble_annotations(runtime_visible_type_annotations,
2328 runtime_visible_type_annotations_length,
2329 runtime_invisible_type_annotations,
2330 runtime_invisible_type_annotations_length,
2331 CHECK);
2332 cm->set_type_annotations(a);
2333 }
2334 }
2335
2336
2337 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2338 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2339 // Method* to save footprint, so we only know the size of the resulting Method* when the
2340 // entire method attribute is parsed.
2341 //
2342 // The promoted_flags parameter is used to pass relevant access_flags
2343 // from the method back up to the containing klass. These flag values
2344 // are added to klass's access_flags.
2345
2346 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2347 bool is_interface,
2348 const ConstantPool* cp,
2349 AccessFlags* const promoted_flags,
2350 TRAPS) {
2351 assert(cfs != NULL, "invariant");
2352 assert(cp != NULL, "invariant");
2353 assert(promoted_flags != NULL, "invariant");
2354
2355 ResourceMark rm(THREAD);
2356 // Parse fixed parts:
2357 // access_flags, name_index, descriptor_index, attributes_count
2358 cfs->guarantee_more(8, CHECK_NULL);
2359
2360 int flags = cfs->get_u2_fast();
2361 const u2 name_index = cfs->get_u2_fast();
2362 const int cp_size = cp->length();
2363 check_property(
2364 valid_symbol_at(name_index),
2365 "Illegal constant pool index %u for method name in class file %s",
2366 name_index, CHECK_NULL);
2367 const Symbol* const name = cp->symbol_at(name_index);
2368 verify_legal_method_name(name, CHECK_NULL);
2369
2370 const u2 signature_index = cfs->get_u2_fast();
2371 guarantee_property(
2372 valid_symbol_at(signature_index),
2373 "Illegal constant pool index %u for method signature in class file %s",
2374 signature_index, CHECK_NULL);
2375 const Symbol* const signature = cp->symbol_at(signature_index);
2376
2377 if (name == vmSymbols::class_initializer_name()) {
2378 // We ignore the other access flags for a valid class initializer.
2379 // (JVM Spec 2nd ed., chapter 4.6)
2380 if (_major_version < 51) { // backward compatibility
2381 flags = JVM_ACC_STATIC;
2382 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2383 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2384 } else {
2385 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2386 }
2387 } else {
2388 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2389 }
2390
2391 if (name == vmSymbols::object_initializer_name() && is_interface) {
2392 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2393 }
2394
2395 int args_size = -1; // only used when _need_verify is true
2396 if (_need_verify) {
2397 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2398 verify_legal_method_signature(name, signature, CHECK_NULL);
2399 if (args_size > MAX_ARGS_SIZE) {
2400 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2401 }
2402 }
2403
2404 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2405
2406 // Default values for code and exceptions attribute elements
2407 u2 max_stack = 0;
2408 u2 max_locals = 0;
2409 u4 code_length = 0;
2410 const u1* code_start = 0;
2411 u2 exception_table_length = 0;
2412 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2413 Array<int>* exception_handlers = Universe::the_empty_int_array();
2414 u2 checked_exceptions_length = 0;
2415 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2416 CompressedLineNumberWriteStream* linenumber_table = NULL;
2417 int linenumber_table_length = 0;
2418 int total_lvt_length = 0;
2419 u2 lvt_cnt = 0;
2420 u2 lvtt_cnt = 0;
2421 bool lvt_allocated = false;
2422 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2423 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2424 u2* localvariable_table_length = NULL;
2425 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2426 u2* localvariable_type_table_length = NULL;
2427 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2428 int method_parameters_length = -1;
2429 const u1* method_parameters_data = NULL;
2430 bool method_parameters_seen = false;
2431 bool parsed_code_attribute = false;
2432 bool parsed_checked_exceptions_attribute = false;
2433 bool parsed_stackmap_attribute = false;
2434 // stackmap attribute - JDK1.5
2435 const u1* stackmap_data = NULL;
2436 int stackmap_data_length = 0;
2437 u2 generic_signature_index = 0;
2438 MethodAnnotationCollector parsed_annotations;
2439 const u1* runtime_visible_annotations = NULL;
2440 int runtime_visible_annotations_length = 0;
2441 const u1* runtime_invisible_annotations = NULL;
2442 int runtime_invisible_annotations_length = 0;
2443 const u1* runtime_visible_parameter_annotations = NULL;
2444 int runtime_visible_parameter_annotations_length = 0;
2445 const u1* runtime_invisible_parameter_annotations = NULL;
2446 int runtime_invisible_parameter_annotations_length = 0;
2447 const u1* runtime_visible_type_annotations = NULL;
2448 int runtime_visible_type_annotations_length = 0;
2449 const u1* runtime_invisible_type_annotations = NULL;
2450 int runtime_invisible_type_annotations_length = 0;
2451 bool runtime_invisible_annotations_exists = false;
2452 bool runtime_invisible_type_annotations_exists = false;
2453 bool runtime_invisible_parameter_annotations_exists = false;
2454 const u1* annotation_default = NULL;
2455 int annotation_default_length = 0;
2456
2457 // Parse code and exceptions attribute
2458 u2 method_attributes_count = cfs->get_u2_fast();
2459 while (method_attributes_count--) {
2460 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2461 const u2 method_attribute_name_index = cfs->get_u2_fast();
2462 const u4 method_attribute_length = cfs->get_u4_fast();
2463 check_property(
2464 valid_symbol_at(method_attribute_name_index),
2465 "Invalid method attribute name index %u in class file %s",
2466 method_attribute_name_index, CHECK_NULL);
2467
2468 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2469 if (method_attribute_name == vmSymbols::tag_code()) {
2470 // Parse Code attribute
2471 if (_need_verify) {
2472 guarantee_property(
2473 !access_flags.is_native() && !access_flags.is_abstract(),
2474 "Code attribute in native or abstract methods in class file %s",
2475 CHECK_NULL);
2476 }
2477 if (parsed_code_attribute) {
2478 classfile_parse_error("Multiple Code attributes in class file %s",
2479 CHECK_NULL);
2480 }
2481 parsed_code_attribute = true;
2482
2483 // Stack size, locals size, and code size
2484 if (_major_version == 45 && _minor_version <= 2) {
2485 cfs->guarantee_more(4, CHECK_NULL);
2486 max_stack = cfs->get_u1_fast();
2487 max_locals = cfs->get_u1_fast();
2488 code_length = cfs->get_u2_fast();
2489 } else {
2490 cfs->guarantee_more(8, CHECK_NULL);
2491 max_stack = cfs->get_u2_fast();
2492 max_locals = cfs->get_u2_fast();
2493 code_length = cfs->get_u4_fast();
2494 }
2495 if (_need_verify) {
2496 guarantee_property(args_size <= max_locals,
2497 "Arguments can't fit into locals in class file %s",
2498 CHECK_NULL);
2499 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2500 "Invalid method Code length %u in class file %s",
2501 code_length, CHECK_NULL);
2502 }
2503 // Code pointer
2504 code_start = cfs->current();
2505 assert(code_start != NULL, "null code start");
2506 cfs->guarantee_more(code_length, CHECK_NULL);
2507 cfs->skip_u1_fast(code_length);
2508
2509 // Exception handler table
2510 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2511 exception_table_length = cfs->get_u2_fast();
2512 if (exception_table_length > 0) {
2513 exception_table_start = parse_exception_table(cfs,
2514 code_length,
2515 exception_table_length,
2516 CHECK_NULL);
2517 }
2518
2519 // Parse additional attributes in code attribute
2520 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2521 u2 code_attributes_count = cfs->get_u2_fast();
2522
2523 unsigned int calculated_attribute_length = 0;
2524
2525 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2526 calculated_attribute_length =
2527 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2528 } else {
2529 // max_stack, locals and length are smaller in pre-version 45.2 classes
2530 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2531 }
2532 calculated_attribute_length +=
2533 code_length +
2534 sizeof(exception_table_length) +
2535 sizeof(code_attributes_count) +
2536 exception_table_length *
2537 ( sizeof(u2) + // start_pc
2538 sizeof(u2) + // end_pc
2539 sizeof(u2) + // handler_pc
2540 sizeof(u2) ); // catch_type_index
2541
2542 while (code_attributes_count--) {
2543 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2544 const u2 code_attribute_name_index = cfs->get_u2_fast();
2545 const u4 code_attribute_length = cfs->get_u4_fast();
2546 calculated_attribute_length += code_attribute_length +
2547 sizeof(code_attribute_name_index) +
2548 sizeof(code_attribute_length);
2549 check_property(valid_symbol_at(code_attribute_name_index),
2550 "Invalid code attribute name index %u in class file %s",
2551 code_attribute_name_index,
2552 CHECK_NULL);
2553 if (LoadLineNumberTables &&
2554 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2555 // Parse and compress line number table
2556 parse_linenumber_table(code_attribute_length,
2557 code_length,
2558 &linenumber_table,
2559 CHECK_NULL);
2560
2561 } else if (LoadLocalVariableTables &&
2562 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2563 // Parse local variable table
2564 if (!lvt_allocated) {
2565 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2566 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2567 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2568 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2569 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2570 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2571 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2572 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2573 lvt_allocated = true;
2574 }
2575 if (lvt_cnt == max_lvt_cnt) {
2576 max_lvt_cnt <<= 1;
2577 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2578 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2579 }
2580 localvariable_table_start[lvt_cnt] =
2581 parse_localvariable_table(cfs,
2582 code_length,
2583 max_locals,
2584 code_attribute_length,
2585 &localvariable_table_length[lvt_cnt],
2586 false, // is not LVTT
2587 CHECK_NULL);
2588 total_lvt_length += localvariable_table_length[lvt_cnt];
2589 lvt_cnt++;
2590 } else if (LoadLocalVariableTypeTables &&
2591 _major_version >= JAVA_1_5_VERSION &&
2592 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2593 if (!lvt_allocated) {
2594 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2595 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2596 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2597 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2598 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2599 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2600 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2601 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2602 lvt_allocated = true;
2603 }
2604 // Parse local variable type table
2605 if (lvtt_cnt == max_lvtt_cnt) {
2606 max_lvtt_cnt <<= 1;
2607 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2608 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2609 }
2610 localvariable_type_table_start[lvtt_cnt] =
2611 parse_localvariable_table(cfs,
2612 code_length,
2613 max_locals,
2614 code_attribute_length,
2615 &localvariable_type_table_length[lvtt_cnt],
2616 true, // is LVTT
2617 CHECK_NULL);
2618 lvtt_cnt++;
2619 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2620 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2621 // Stack map is only needed by the new verifier in JDK1.5.
2622 if (parsed_stackmap_attribute) {
2623 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2624 }
2625 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2626 stackmap_data_length = code_attribute_length;
2627 parsed_stackmap_attribute = true;
2628 } else {
2629 // Skip unknown attributes
2630 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2631 }
2632 }
2633 // check method attribute length
2634 if (_need_verify) {
2635 guarantee_property(method_attribute_length == calculated_attribute_length,
2636 "Code segment has wrong length in class file %s",
2637 CHECK_NULL);
2638 }
2639 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2640 // Parse Exceptions attribute
2641 if (parsed_checked_exceptions_attribute) {
2642 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2643 CHECK_NULL);
2644 }
2645 parsed_checked_exceptions_attribute = true;
2646 checked_exceptions_start =
2647 parse_checked_exceptions(cfs,
2648 &checked_exceptions_length,
2649 method_attribute_length,
2650 CHECK_NULL);
2651 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2652 // reject multiple method parameters
2653 if (method_parameters_seen) {
2654 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2655 CHECK_NULL);
2656 }
2657 method_parameters_seen = true;
2658 method_parameters_length = cfs->get_u1_fast();
2659 const u2 real_length = (method_parameters_length * 4u) + 1u;
2660 if (method_attribute_length != real_length) {
2661 classfile_parse_error(
2662 "Invalid MethodParameters method attribute length %u in class file",
2663 method_attribute_length, CHECK_NULL);
2664 }
2665 method_parameters_data = cfs->current();
2666 cfs->skip_u2_fast(method_parameters_length);
2667 cfs->skip_u2_fast(method_parameters_length);
2668 // ignore this attribute if it cannot be reflected
2669 if (!SystemDictionary::Parameter_klass_loaded())
2670 method_parameters_length = -1;
2671 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2672 if (method_attribute_length != 0) {
2673 classfile_parse_error(
2674 "Invalid Synthetic method attribute length %u in class file %s",
2675 method_attribute_length, CHECK_NULL);
2676 }
2677 // Should we check that there hasn't already been a synthetic attribute?
2678 access_flags.set_is_synthetic();
2679 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2680 if (method_attribute_length != 0) {
2681 classfile_parse_error(
2682 "Invalid Deprecated method attribute length %u in class file %s",
2683 method_attribute_length, CHECK_NULL);
2684 }
2685 } else if (_major_version >= JAVA_1_5_VERSION) {
2686 if (method_attribute_name == vmSymbols::tag_signature()) {
2687 if (generic_signature_index != 0) {
2688 classfile_parse_error(
2689 "Multiple Signature attributes for method in class file %s",
2690 CHECK_NULL);
2691 }
2692 if (method_attribute_length != 2) {
2693 classfile_parse_error(
2694 "Invalid Signature attribute length %u in class file %s",
2695 method_attribute_length, CHECK_NULL);
2696 }
2697 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2698 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2699 if (runtime_visible_annotations != NULL) {
2700 classfile_parse_error(
2701 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2702 CHECK_NULL);
2703 }
2704 runtime_visible_annotations_length = method_attribute_length;
2705 runtime_visible_annotations = cfs->current();
2706 assert(runtime_visible_annotations != NULL, "null visible annotations");
2707 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2708 parse_annotations(cp,
2709 runtime_visible_annotations,
2710 runtime_visible_annotations_length,
2711 &parsed_annotations,
2712 _loader_data,
2713 CHECK_NULL);
2714 cfs->skip_u1_fast(runtime_visible_annotations_length);
2715 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2716 if (runtime_invisible_annotations_exists) {
2717 classfile_parse_error(
2718 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2719 CHECK_NULL);
2720 }
2721 runtime_invisible_annotations_exists = true;
2722 if (PreserveAllAnnotations) {
2723 runtime_invisible_annotations_length = method_attribute_length;
2724 runtime_invisible_annotations = cfs->current();
2725 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2726 }
2727 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2728 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2729 if (runtime_visible_parameter_annotations != NULL) {
2730 classfile_parse_error(
2731 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2732 CHECK_NULL);
2733 }
2734 runtime_visible_parameter_annotations_length = method_attribute_length;
2735 runtime_visible_parameter_annotations = cfs->current();
2736 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2737 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2738 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2739 if (runtime_invisible_parameter_annotations_exists) {
2740 classfile_parse_error(
2741 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2742 CHECK_NULL);
2743 }
2744 runtime_invisible_parameter_annotations_exists = true;
2745 if (PreserveAllAnnotations) {
2746 runtime_invisible_parameter_annotations_length = method_attribute_length;
2747 runtime_invisible_parameter_annotations = cfs->current();
2748 assert(runtime_invisible_parameter_annotations != NULL,
2749 "null invisible parameter annotations");
2750 }
2751 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2752 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2753 if (annotation_default != NULL) {
2754 classfile_parse_error(
2755 "Multiple AnnotationDefault attributes for method in class file %s",
2756 CHECK_NULL);
2757 }
2758 annotation_default_length = method_attribute_length;
2759 annotation_default = cfs->current();
2760 assert(annotation_default != NULL, "null annotation default");
2761 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2762 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2763 if (runtime_visible_type_annotations != NULL) {
2764 classfile_parse_error(
2765 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2766 CHECK_NULL);
2767 }
2768 runtime_visible_type_annotations_length = method_attribute_length;
2769 runtime_visible_type_annotations = cfs->current();
2770 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2771 // No need for the VM to parse Type annotations
2772 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2773 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2774 if (runtime_invisible_type_annotations_exists) {
2775 classfile_parse_error(
2776 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2777 CHECK_NULL);
2778 } else {
2779 runtime_invisible_type_annotations_exists = true;
2780 }
2781 if (PreserveAllAnnotations) {
2782 runtime_invisible_type_annotations_length = method_attribute_length;
2783 runtime_invisible_type_annotations = cfs->current();
2784 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2785 }
2786 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2787 } else {
2788 // Skip unknown attributes
2789 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2790 }
2791 } else {
2792 // Skip unknown attributes
2793 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2794 }
2795 }
2796
2797 if (linenumber_table != NULL) {
2798 linenumber_table->write_terminator();
2799 linenumber_table_length = linenumber_table->position();
2800 }
2801
2802 // Make sure there's at least one Code attribute in non-native/non-abstract method
2803 if (_need_verify) {
2804 guarantee_property(access_flags.is_native() ||
2805 access_flags.is_abstract() ||
2806 parsed_code_attribute,
2807 "Absent Code attribute in method that is not native or abstract in class file %s",
2808 CHECK_NULL);
2809 }
2810
2811 // All sizing information for a Method* is finally available, now create it
2812 InlineTableSizes sizes(
2813 total_lvt_length,
2814 linenumber_table_length,
2815 exception_table_length,
2816 checked_exceptions_length,
2817 method_parameters_length,
2818 generic_signature_index,
2819 runtime_visible_annotations_length +
2820 runtime_invisible_annotations_length,
2821 runtime_visible_parameter_annotations_length +
2822 runtime_invisible_parameter_annotations_length,
2823 runtime_visible_type_annotations_length +
2824 runtime_invisible_type_annotations_length,
2825 annotation_default_length,
2826 0);
2827
2828 Method* const m = Method::allocate(_loader_data,
2829 code_length,
2830 access_flags,
2831 &sizes,
2832 ConstMethod::NORMAL,
2833 CHECK_NULL);
2834
2835 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2836
2837 // Fill in information from fixed part (access_flags already set)
2838 m->set_constants(_cp);
2839 m->set_name_index(name_index);
2840 m->set_signature_index(signature_index);
2841
2842 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2843 m->constMethod()->set_result_type(rtf.type());
2844
2845 if (args_size >= 0) {
2846 m->set_size_of_parameters(args_size);
2847 } else {
2848 m->compute_size_of_parameters(THREAD);
2849 }
2850 #ifdef ASSERT
2851 if (args_size >= 0) {
2852 m->compute_size_of_parameters(THREAD);
2853 assert(args_size == m->size_of_parameters(), "");
2854 }
2855 #endif
2856
2857 // Fill in code attribute information
2858 m->set_max_stack(max_stack);
2859 m->set_max_locals(max_locals);
2860 if (stackmap_data != NULL) {
2861 m->constMethod()->copy_stackmap_data(_loader_data,
2862 (u1*)stackmap_data,
2863 stackmap_data_length,
2864 CHECK_NULL);
2865 }
2866
2867 // Copy byte codes
2868 m->set_code((u1*)code_start);
2869
2870 // Copy line number table
2871 if (linenumber_table != NULL) {
2872 memcpy(m->compressed_linenumber_table(),
2873 linenumber_table->buffer(),
2874 linenumber_table_length);
2875 }
2876
2877 // Copy exception table
2878 if (exception_table_length > 0) {
2879 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2880 m->exception_table_start(),
2881 exception_table_length * sizeof(ExceptionTableElement),
2882 sizeof(u2));
2883 }
2884
2885 // Copy method parameters
2886 if (method_parameters_length > 0) {
2887 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2888 for (int i = 0; i < method_parameters_length; i++) {
2889 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2890 method_parameters_data += 2;
2891 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2892 method_parameters_data += 2;
2893 }
2894 }
2895
2896 // Copy checked exceptions
2897 if (checked_exceptions_length > 0) {
2898 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2899 m->checked_exceptions_start(),
2900 checked_exceptions_length * sizeof(CheckedExceptionElement),
2901 sizeof(u2));
2902 }
2903
2904 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2905 if (total_lvt_length > 0) {
2906 promoted_flags->set_has_localvariable_table();
2907 copy_localvariable_table(m->constMethod(),
2908 lvt_cnt,
2909 localvariable_table_length,
2910 localvariable_table_start,
2911 lvtt_cnt,
2912 localvariable_type_table_length,
2913 localvariable_type_table_start,
2914 CHECK_NULL);
2915 }
2916
2917 if (parsed_annotations.has_any_annotations())
2918 parsed_annotations.apply_to(m);
2919
2920 // Copy annotations
2921 copy_method_annotations(m->constMethod(),
2922 runtime_visible_annotations,
2923 runtime_visible_annotations_length,
2924 runtime_invisible_annotations,
2925 runtime_invisible_annotations_length,
2926 runtime_visible_parameter_annotations,
2927 runtime_visible_parameter_annotations_length,
2928 runtime_invisible_parameter_annotations,
2929 runtime_invisible_parameter_annotations_length,
2930 runtime_visible_type_annotations,
2931 runtime_visible_type_annotations_length,
2932 runtime_invisible_type_annotations,
2933 runtime_invisible_type_annotations_length,
2934 annotation_default,
2935 annotation_default_length,
2936 CHECK_NULL);
2937
2938 if (name == vmSymbols::finalize_method_name() &&
2939 signature == vmSymbols::void_method_signature()) {
2940 if (m->is_empty_method()) {
2941 _has_empty_finalizer = true;
2942 } else {
2943 _has_finalizer = true;
2944 }
2945 }
2946 if (name == vmSymbols::object_initializer_name() &&
2947 signature == vmSymbols::void_method_signature() &&
2948 m->is_vanilla_constructor()) {
2949 _has_vanilla_constructor = true;
2950 }
2951
2952 NOT_PRODUCT(m->verify());
2953 return m;
2954 }
2955
2956
2957 // The promoted_flags parameter is used to pass relevant access_flags
2958 // from the methods back up to the containing klass. These flag values
2959 // are added to klass's access_flags.
2960 // Side-effects: populates the _methods field in the parser
2961 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2962 bool is_interface,
2963 AccessFlags* promoted_flags,
2964 bool* has_final_method,
2965 bool* declares_nonstatic_concrete_methods,
2966 TRAPS) {
2967 assert(cfs != NULL, "invariant");
2968 assert(promoted_flags != NULL, "invariant");
2969 assert(has_final_method != NULL, "invariant");
2970 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2971
2972 assert(NULL == _methods, "invariant");
2973
2974 cfs->guarantee_more(2, CHECK); // length
2975 const u2 length = cfs->get_u2_fast();
2976 if (length == 0) {
2977 _methods = Universe::the_empty_method_array();
2978 } else {
2979 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2980 length,
2981 NULL,
2982 CHECK);
2983
2984 for (int index = 0; index < length; index++) {
2985 Method* method = parse_method(cfs,
2986 is_interface,
2987 _cp,
2988 promoted_flags,
2989 CHECK);
2990
2991 if (method->is_final()) {
2992 *has_final_method = true;
2993 }
2994 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2995 // used for interface initialization, and default method inheritance analysis
2996 if (is_interface && !(*declares_nonstatic_concrete_methods)
2997 && !method->is_abstract() && !method->is_static()) {
2998 *declares_nonstatic_concrete_methods = true;
2999 }
3000 _methods->at_put(index, method);
3001 }
3002
3003 if (_need_verify && length > 1) {
3004 // Check duplicated methods
3005 ResourceMark rm(THREAD);
3006 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
3007 THREAD, NameSigHash*, HASH_ROW_SIZE);
3008 initialize_hashtable(names_and_sigs);
3009 bool dup = false;
3010 const Symbol* name = NULL;
3011 const Symbol* sig = NULL;
3012 {
3013 debug_only(NoSafepointVerifier nsv;)
3014 for (int i = 0; i < length; i++) {
3015 const Method* const m = _methods->at(i);
3016 name = m->name();
3017 sig = m->signature();
3018 // If no duplicates, add name/signature in hashtable names_and_sigs.
3019 if (!put_after_lookup(name, sig, names_and_sigs)) {
3020 dup = true;
3021 break;
3022 }
3023 }
3024 }
3025 if (dup) {
3026 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
3027 name->as_C_string(), sig->as_klass_external_name(), CHECK);
3028 }
3029 }
3030 }
3031 }
3032
3033 static const intArray* sort_methods(Array<Method*>* methods) {
3034 const int length = methods->length();
3035 // If JVMTI original method ordering or sharing is enabled we have to
3036 // remember the original class file ordering.
3037 // We temporarily use the vtable_index field in the Method* to store the
3038 // class file index, so we can read in after calling qsort.
3039 // Put the method ordering in the shared archive.
3040 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3041 for (int index = 0; index < length; index++) {
3042 Method* const m = methods->at(index);
3043 assert(!m->valid_vtable_index(), "vtable index should not be set");
3044 m->set_vtable_index(index);
3045 }
3046 }
3047 // Sort method array by ascending method name (for faster lookups & vtable construction)
3048 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3049 Method::sort_methods(methods);
3050
3051 intArray* method_ordering = NULL;
3052 // If JVMTI original method ordering or sharing is enabled construct int
3053 // array remembering the original ordering
3054 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3055 method_ordering = new intArray(length, length, -1);
3056 for (int index = 0; index < length; index++) {
3057 Method* const m = methods->at(index);
3058 const int old_index = m->vtable_index();
3059 assert(old_index >= 0 && old_index < length, "invalid method index");
3060 method_ordering->at_put(index, old_index);
3061 m->set_vtable_index(Method::invalid_vtable_index);
3062 }
3063 }
3064 return method_ordering;
3065 }
3066
3067 // Parse generic_signature attribute for methods and fields
3068 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3069 TRAPS) {
3070 assert(cfs != NULL, "invariant");
3071
3072 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3073 const u2 generic_signature_index = cfs->get_u2_fast();
3074 check_property(
3075 valid_symbol_at(generic_signature_index),
3076 "Invalid Signature attribute at constant pool index %u in class file %s",
3077 generic_signature_index, CHECK_0);
3078 return generic_signature_index;
3079 }
3080
3081 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3082 TRAPS) {
3083
3084 assert(cfs != NULL, "invariant");
3085
3086 cfs->guarantee_more(2, CHECK); // sourcefile_index
3087 const u2 sourcefile_index = cfs->get_u2_fast();
3088 check_property(
3089 valid_symbol_at(sourcefile_index),
3090 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3091 sourcefile_index, CHECK);
3092 set_class_sourcefile_index(sourcefile_index);
3093 }
3094
3095 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3096 int length,
3097 TRAPS) {
3098 assert(cfs != NULL, "invariant");
3099
3100 const u1* const sde_buffer = cfs->current();
3101 assert(sde_buffer != NULL, "null sde buffer");
3102
3103 // Don't bother storing it if there is no way to retrieve it
3104 if (JvmtiExport::can_get_source_debug_extension()) {
3105 assert((length+1) > length, "Overflow checking");
3106 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3107 for (int i = 0; i < length; i++) {
3108 sde[i] = sde_buffer[i];
3109 }
3110 sde[length] = '\0';
3111 set_class_sde_buffer((const char*)sde, length);
3112 }
3113 // Got utf8 string, set stream position forward
3114 cfs->skip_u1(length, CHECK);
3115 }
3116
3117
3118 // Inner classes can be static, private or protected (classic VM does this)
3119 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3120 JVM_ACC_PRIVATE | \
3121 JVM_ACC_PROTECTED | \
3122 JVM_ACC_STATIC \
3123 )
3124
3125 // Return number of classes in the inner classes attribute table
3126 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3127 const u1* const inner_classes_attribute_start,
3128 bool parsed_enclosingmethod_attribute,
3129 u2 enclosing_method_class_index,
3130 u2 enclosing_method_method_index,
3131 TRAPS) {
3132 const u1* const current_mark = cfs->current();
3133 u2 length = 0;
3134 if (inner_classes_attribute_start != NULL) {
3135 cfs->set_current(inner_classes_attribute_start);
3136 cfs->guarantee_more(2, CHECK_0); // length
3137 length = cfs->get_u2_fast();
3138 }
3139
3140 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3141 // method data:
3142 // [inner_class_info_index,
3143 // outer_class_info_index,
3144 // inner_name_index,
3145 // inner_class_access_flags,
3146 // ...
3147 // enclosing_method_class_index,
3148 // enclosing_method_method_index]
3149 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3150 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3151 _inner_classes = inner_classes;
3152
3153 int index = 0;
3154 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3155 for (int n = 0; n < length; n++) {
3156 // Inner class index
3157 const u2 inner_class_info_index = cfs->get_u2_fast();
3158 check_property(
3159 valid_klass_reference_at(inner_class_info_index),
3160 "inner_class_info_index %u has bad constant type in class file %s",
3161 inner_class_info_index, CHECK_0);
3162 // Outer class index
3163 const u2 outer_class_info_index = cfs->get_u2_fast();
3164 check_property(
3165 outer_class_info_index == 0 ||
3166 valid_klass_reference_at(outer_class_info_index),
3167 "outer_class_info_index %u has bad constant type in class file %s",
3168 outer_class_info_index, CHECK_0);
3169 // Inner class name
3170 const u2 inner_name_index = cfs->get_u2_fast();
3171 check_property(
3172 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3173 "inner_name_index %u has bad constant type in class file %s",
3174 inner_name_index, CHECK_0);
3175 if (_need_verify) {
3176 guarantee_property(inner_class_info_index != outer_class_info_index,
3177 "Class is both outer and inner class in class file %s", CHECK_0);
3178 }
3179 // Access flags
3180 jint flags;
3181 // JVM_ACC_MODULE is defined in JDK-9 and later.
3182 if (_major_version >= JAVA_9_VERSION) {
3183 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3184 } else {
3185 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3186 }
3187 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3188 // Set abstract bit for old class files for backward compatibility
3189 flags |= JVM_ACC_ABSTRACT;
3190 }
3191 verify_legal_class_modifiers(flags, CHECK_0);
3192 AccessFlags inner_access_flags(flags);
3193
3194 inner_classes->at_put(index++, inner_class_info_index);
3195 inner_classes->at_put(index++, outer_class_info_index);
3196 inner_classes->at_put(index++, inner_name_index);
3197 inner_classes->at_put(index++, inner_access_flags.as_short());
3198 }
3199
3200 // 4347400: make sure there's no duplicate entry in the classes array
3201 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3202 for(int i = 0; i < length * 4; i += 4) {
3203 for(int j = i + 4; j < length * 4; j += 4) {
3204 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3205 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3206 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3207 inner_classes->at(i+3) != inner_classes->at(j+3)),
3208 "Duplicate entry in InnerClasses in class file %s",
3209 CHECK_0);
3210 }
3211 }
3212 }
3213
3214 // Set EnclosingMethod class and method indexes.
3215 if (parsed_enclosingmethod_attribute) {
3216 inner_classes->at_put(index++, enclosing_method_class_index);
3217 inner_classes->at_put(index++, enclosing_method_method_index);
3218 }
3219 assert(index == size, "wrong size");
3220
3221 // Restore buffer's current position.
3222 cfs->set_current(current_mark);
3223
3224 return length;
3225 }
3226
3227 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3228 const u1* const nest_members_attribute_start,
3229 TRAPS) {
3230 const u1* const current_mark = cfs->current();
3231 u2 length = 0;
3232 if (nest_members_attribute_start != NULL) {
3233 cfs->set_current(nest_members_attribute_start);
3234 cfs->guarantee_more(2, CHECK_0); // length
3235 length = cfs->get_u2_fast();
3236 }
3237 const int size = length;
3238 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3239 _nest_members = nest_members;
3240
3241 int index = 0;
3242 cfs->guarantee_more(2 * length, CHECK_0);
3243 for (int n = 0; n < length; n++) {
3244 const u2 class_info_index = cfs->get_u2_fast();
3245 check_property(
3246 valid_klass_reference_at(class_info_index),
3247 "Nest member class_info_index %u has bad constant type in class file %s",
3248 class_info_index, CHECK_0);
3249 nest_members->at_put(index++, class_info_index);
3250 }
3251 assert(index == size, "wrong size");
3252
3253 // Restore buffer's current position.
3254 cfs->set_current(current_mark);
3255
3256 return length;
3257 }
3258
3259 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3260 set_class_synthetic_flag(true);
3261 }
3262
3263 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3264 assert(cfs != NULL, "invariant");
3265
3266 const u2 signature_index = cfs->get_u2(CHECK);
3267 check_property(
3268 valid_symbol_at(signature_index),
3269 "Invalid constant pool index %u in Signature attribute in class file %s",
3270 signature_index, CHECK);
3271 set_class_generic_signature_index(signature_index);
3272 }
3273
3274 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3275 ConstantPool* cp,
3276 u4 attribute_byte_length,
3277 TRAPS) {
3278 assert(cfs != NULL, "invariant");
3279 assert(cp != NULL, "invariant");
3280
3281 const u1* const current_start = cfs->current();
3282
3283 guarantee_property(attribute_byte_length >= sizeof(u2),
3284 "Invalid BootstrapMethods attribute length %u in class file %s",
3285 attribute_byte_length,
3286 CHECK);
3287
3288 cfs->guarantee_more(attribute_byte_length, CHECK);
3289
3290 const int attribute_array_length = cfs->get_u2_fast();
3291
3292 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3293 "Short length on BootstrapMethods in class file %s",
3294 CHECK);
3295
3296
3297 // The attribute contains a counted array of counted tuples of shorts,
3298 // represending bootstrap specifiers:
3299 // length*{bootstrap_method_index, argument_count*{argument_index}}
3300 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3301 // operand_count = number of shorts in attr, except for leading length
3302
3303 // The attribute is copied into a short[] array.
3304 // The array begins with a series of short[2] pairs, one for each tuple.
3305 const int index_size = (attribute_array_length * 2);
3306
3307 Array<u2>* const operands =
3308 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3309
3310 // Eagerly assign operands so they will be deallocated with the constant
3311 // pool if there is an error.
3312 cp->set_operands(operands);
3313
3314 int operand_fill_index = index_size;
3315 const int cp_size = cp->length();
3316
3317 for (int n = 0; n < attribute_array_length; n++) {
3318 // Store a 32-bit offset into the header of the operand array.
3319 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3320
3321 // Read a bootstrap specifier.
3322 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3323 const u2 bootstrap_method_index = cfs->get_u2_fast();
3324 const u2 argument_count = cfs->get_u2_fast();
3325 check_property(
3326 valid_cp_range(bootstrap_method_index, cp_size) &&
3327 cp->tag_at(bootstrap_method_index).is_method_handle(),
3328 "bootstrap_method_index %u has bad constant type in class file %s",
3329 bootstrap_method_index,
3330 CHECK);
3331
3332 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3333 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3334 CHECK);
3335
3336 operands->at_put(operand_fill_index++, bootstrap_method_index);
3337 operands->at_put(operand_fill_index++, argument_count);
3338
3339 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3340 for (int j = 0; j < argument_count; j++) {
3341 const u2 argument_index = cfs->get_u2_fast();
3342 check_property(
3343 valid_cp_range(argument_index, cp_size) &&
3344 cp->tag_at(argument_index).is_loadable_constant(),
3345 "argument_index %u has bad constant type in class file %s",
3346 argument_index,
3347 CHECK);
3348 operands->at_put(operand_fill_index++, argument_index);
3349 }
3350 }
3351 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3352 "Bad length on BootstrapMethods in class file %s",
3353 CHECK);
3354 }
3355
3356 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3357 ConstantPool* cp,
3358 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3359 TRAPS) {
3360 assert(cfs != NULL, "invariant");
3361 assert(cp != NULL, "invariant");
3362 assert(parsed_annotations != NULL, "invariant");
3363
3364 // Set inner classes attribute to default sentinel
3365 _inner_classes = Universe::the_empty_short_array();
3366 // Set nest members attribute to default sentinel
3367 _nest_members = Universe::the_empty_short_array();
3368 cfs->guarantee_more(2, CHECK); // attributes_count
3369 u2 attributes_count = cfs->get_u2_fast();
3370 bool parsed_sourcefile_attribute = false;
3371 bool parsed_innerclasses_attribute = false;
3372 bool parsed_nest_members_attribute = false;
3373 bool parsed_nest_host_attribute = false;
3374 bool parsed_enclosingmethod_attribute = false;
3375 bool parsed_bootstrap_methods_attribute = false;
3376 const u1* runtime_visible_annotations = NULL;
3377 int runtime_visible_annotations_length = 0;
3378 const u1* runtime_invisible_annotations = NULL;
3379 int runtime_invisible_annotations_length = 0;
3380 const u1* runtime_visible_type_annotations = NULL;
3381 int runtime_visible_type_annotations_length = 0;
3382 const u1* runtime_invisible_type_annotations = NULL;
3383 int runtime_invisible_type_annotations_length = 0;
3384 bool runtime_invisible_type_annotations_exists = false;
3385 bool runtime_invisible_annotations_exists = false;
3386 bool parsed_source_debug_ext_annotations_exist = false;
3387 const u1* inner_classes_attribute_start = NULL;
3388 u4 inner_classes_attribute_length = 0;
3389 u2 enclosing_method_class_index = 0;
3390 u2 enclosing_method_method_index = 0;
3391 const u1* nest_members_attribute_start = NULL;
3392 u4 nest_members_attribute_length = 0;
3393
3394 // Iterate over attributes
3395 while (attributes_count--) {
3396 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3397 const u2 attribute_name_index = cfs->get_u2_fast();
3398 const u4 attribute_length = cfs->get_u4_fast();
3399 check_property(
3400 valid_symbol_at(attribute_name_index),
3401 "Attribute name has bad constant pool index %u in class file %s",
3402 attribute_name_index, CHECK);
3403 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3404 if (tag == vmSymbols::tag_source_file()) {
3405 // Check for SourceFile tag
3406 if (_need_verify) {
3407 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3408 }
3409 if (parsed_sourcefile_attribute) {
3410 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3411 } else {
3412 parsed_sourcefile_attribute = true;
3413 }
3414 parse_classfile_sourcefile_attribute(cfs, CHECK);
3415 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3416 // Check for SourceDebugExtension tag
3417 if (parsed_source_debug_ext_annotations_exist) {
3418 classfile_parse_error(
3419 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3420 }
3421 parsed_source_debug_ext_annotations_exist = true;
3422 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3423 } else if (tag == vmSymbols::tag_inner_classes()) {
3424 // Check for InnerClasses tag
3425 if (parsed_innerclasses_attribute) {
3426 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3427 } else {
3428 parsed_innerclasses_attribute = true;
3429 }
3430 inner_classes_attribute_start = cfs->current();
3431 inner_classes_attribute_length = attribute_length;
3432 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3433 } else if (tag == vmSymbols::tag_synthetic()) {
3434 // Check for Synthetic tag
3435 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3436 if (attribute_length != 0) {
3437 classfile_parse_error(
3438 "Invalid Synthetic classfile attribute length %u in class file %s",
3439 attribute_length, CHECK);
3440 }
3441 parse_classfile_synthetic_attribute(CHECK);
3442 } else if (tag == vmSymbols::tag_deprecated()) {
3443 // Check for Deprecatd tag - 4276120
3444 if (attribute_length != 0) {
3445 classfile_parse_error(
3446 "Invalid Deprecated classfile attribute length %u in class file %s",
3447 attribute_length, CHECK);
3448 }
3449 } else if (_major_version >= JAVA_1_5_VERSION) {
3450 if (tag == vmSymbols::tag_signature()) {
3451 if (_generic_signature_index != 0) {
3452 classfile_parse_error(
3453 "Multiple Signature attributes in class file %s", CHECK);
3454 }
3455 if (attribute_length != 2) {
3456 classfile_parse_error(
3457 "Wrong Signature attribute length %u in class file %s",
3458 attribute_length, CHECK);
3459 }
3460 parse_classfile_signature_attribute(cfs, CHECK);
3461 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3462 if (runtime_visible_annotations != NULL) {
3463 classfile_parse_error(
3464 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3465 }
3466 runtime_visible_annotations_length = attribute_length;
3467 runtime_visible_annotations = cfs->current();
3468 assert(runtime_visible_annotations != NULL, "null visible annotations");
3469 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3470 parse_annotations(cp,
3471 runtime_visible_annotations,
3472 runtime_visible_annotations_length,
3473 parsed_annotations,
3474 _loader_data,
3475 CHECK);
3476 cfs->skip_u1_fast(runtime_visible_annotations_length);
3477 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3478 if (runtime_invisible_annotations_exists) {
3479 classfile_parse_error(
3480 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3481 }
3482 runtime_invisible_annotations_exists = true;
3483 if (PreserveAllAnnotations) {
3484 runtime_invisible_annotations_length = attribute_length;
3485 runtime_invisible_annotations = cfs->current();
3486 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3487 }
3488 cfs->skip_u1(attribute_length, CHECK);
3489 } else if (tag == vmSymbols::tag_enclosing_method()) {
3490 if (parsed_enclosingmethod_attribute) {
3491 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3492 } else {
3493 parsed_enclosingmethod_attribute = true;
3494 }
3495 guarantee_property(attribute_length == 4,
3496 "Wrong EnclosingMethod attribute length %u in class file %s",
3497 attribute_length, CHECK);
3498 cfs->guarantee_more(4, CHECK); // class_index, method_index
3499 enclosing_method_class_index = cfs->get_u2_fast();
3500 enclosing_method_method_index = cfs->get_u2_fast();
3501 if (enclosing_method_class_index == 0) {
3502 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3503 }
3504 // Validate the constant pool indices and types
3505 check_property(valid_klass_reference_at(enclosing_method_class_index),
3506 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3507 if (enclosing_method_method_index != 0 &&
3508 (!cp->is_within_bounds(enclosing_method_method_index) ||
3509 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3510 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3511 }
3512 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3513 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3514 if (parsed_bootstrap_methods_attribute) {
3515 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3516 }
3517 parsed_bootstrap_methods_attribute = true;
3518 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3519 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3520 if (runtime_visible_type_annotations != NULL) {
3521 classfile_parse_error(
3522 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3523 }
3524 runtime_visible_type_annotations_length = attribute_length;
3525 runtime_visible_type_annotations = cfs->current();
3526 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3527 // No need for the VM to parse Type annotations
3528 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3529 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3530 if (runtime_invisible_type_annotations_exists) {
3531 classfile_parse_error(
3532 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3533 } else {
3534 runtime_invisible_type_annotations_exists = true;
3535 }
3536 if (PreserveAllAnnotations) {
3537 runtime_invisible_type_annotations_length = attribute_length;
3538 runtime_invisible_type_annotations = cfs->current();
3539 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3540 }
3541 cfs->skip_u1(attribute_length, CHECK);
3542 } else if (_major_version >= JAVA_11_VERSION) {
3543 if (tag == vmSymbols::tag_nest_members()) {
3544 // Check for NestMembers tag
3545 if (parsed_nest_members_attribute) {
3546 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK);
3547 } else {
3548 parsed_nest_members_attribute = true;
3549 }
3550 if (parsed_nest_host_attribute) {
3551 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK);
3552 }
3553 nest_members_attribute_start = cfs->current();
3554 nest_members_attribute_length = attribute_length;
3555 cfs->skip_u1(nest_members_attribute_length, CHECK);
3556 } else if (tag == vmSymbols::tag_nest_host()) {
3557 if (parsed_nest_host_attribute) {
3558 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK);
3559 } else {
3560 parsed_nest_host_attribute = true;
3561 }
3562 if (parsed_nest_members_attribute) {
3563 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK);
3564 }
3565 if (_need_verify) {
3566 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3567 }
3568 cfs->guarantee_more(2, CHECK);
3569 u2 class_info_index = cfs->get_u2_fast();
3570 check_property(
3571 valid_klass_reference_at(class_info_index),
3572 "Nest-host class_info_index %u has bad constant type in class file %s",
3573 class_info_index, CHECK);
3574 _nest_host = class_info_index;
3575 }
3576 } else {
3577 // Unknown attribute
3578 cfs->skip_u1(attribute_length, CHECK);
3579 }
3580 } else {
3581 // Unknown attribute
3582 cfs->skip_u1(attribute_length, CHECK);
3583 }
3584 }
3585 _annotations = assemble_annotations(runtime_visible_annotations,
3586 runtime_visible_annotations_length,
3587 runtime_invisible_annotations,
3588 runtime_invisible_annotations_length,
3589 CHECK);
3590 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3591 runtime_visible_type_annotations_length,
3592 runtime_invisible_type_annotations,
3593 runtime_invisible_type_annotations_length,
3594 CHECK);
3595
3596 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3597 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3598 cfs,
3599 inner_classes_attribute_start,
3600 parsed_innerclasses_attribute,
3601 enclosing_method_class_index,
3602 enclosing_method_method_index,
3603 CHECK);
3604 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3605 guarantee_property(
3606 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3607 "Wrong InnerClasses attribute length in class file %s", CHECK);
3608 }
3609 }
3610
3611 if (parsed_nest_members_attribute) {
3612 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3613 cfs,
3614 nest_members_attribute_start,
3615 CHECK);
3616 if (_need_verify) {
3617 guarantee_property(
3618 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3619 "Wrong NestMembers attribute length in class file %s", CHECK);
3620 }
3621 }
3622
3623 if (_max_bootstrap_specifier_index >= 0) {
3624 guarantee_property(parsed_bootstrap_methods_attribute,
3625 "Missing BootstrapMethods attribute in class file %s", CHECK);
3626 }
3627 }
3628
3629 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3630 assert(k != NULL, "invariant");
3631
3632 if (_synthetic_flag)
3633 k->set_is_synthetic();
3634 if (_sourcefile_index != 0) {
3635 k->set_source_file_name_index(_sourcefile_index);
3636 }
3637 if (_generic_signature_index != 0) {
3638 k->set_generic_signature_index(_generic_signature_index);
3639 }
3640 if (_sde_buffer != NULL) {
3641 k->set_source_debug_extension(_sde_buffer, _sde_length);
3642 }
3643 }
3644
3645 // Create the Annotations object that will
3646 // hold the annotations array for the Klass.
3647 void ClassFileParser::create_combined_annotations(TRAPS) {
3648 if (_annotations == NULL &&
3649 _type_annotations == NULL &&
3650 _fields_annotations == NULL &&
3651 _fields_type_annotations == NULL) {
3652 // Don't create the Annotations object unnecessarily.
3653 return;
3654 }
3655
3656 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3657 annotations->set_class_annotations(_annotations);
3658 annotations->set_class_type_annotations(_type_annotations);
3659 annotations->set_fields_annotations(_fields_annotations);
3660 annotations->set_fields_type_annotations(_fields_type_annotations);
3661
3662 // This is the Annotations object that will be
3663 // assigned to InstanceKlass being constructed.
3664 _combined_annotations = annotations;
3665
3666 // The annotations arrays below has been transfered the
3667 // _combined_annotations so these fields can now be cleared.
3668 _annotations = NULL;
3669 _type_annotations = NULL;
3670 _fields_annotations = NULL;
3671 _fields_type_annotations = NULL;
3672 }
3673
3674 // Transfer ownership of metadata allocated to the InstanceKlass.
3675 void ClassFileParser::apply_parsed_class_metadata(
3676 InstanceKlass* this_klass,
3677 int java_fields_count, TRAPS) {
3678 assert(this_klass != NULL, "invariant");
3679
3680 _cp->set_pool_holder(this_klass);
3681 this_klass->set_constants(_cp);
3682 this_klass->set_fields(_fields, java_fields_count);
3683 this_klass->set_methods(_methods);
3684 this_klass->set_inner_classes(_inner_classes);
3685 this_klass->set_nest_members(_nest_members);
3686 this_klass->set_nest_host_index(_nest_host);
3687 this_klass->set_local_interfaces(_local_interfaces);
3688 this_klass->set_annotations(_combined_annotations);
3689 // Delay the setting of _transitive_interfaces until after initialize_supers() in
3690 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with
3691 // its _super. If an OOM occurs while loading the current klass, its _super field
3692 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3693 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3694 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3695
3696 // Clear out these fields so they don't get deallocated by the destructor
3697 clear_class_metadata();
3698 }
3699
3700 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3701 int runtime_visible_annotations_length,
3702 const u1* const runtime_invisible_annotations,
3703 int runtime_invisible_annotations_length,
3704 TRAPS) {
3705 AnnotationArray* annotations = NULL;
3706 if (runtime_visible_annotations != NULL ||
3707 runtime_invisible_annotations != NULL) {
3708 annotations = MetadataFactory::new_array<u1>(_loader_data,
3709 runtime_visible_annotations_length +
3710 runtime_invisible_annotations_length,
3711 CHECK_(annotations));
3712 if (runtime_visible_annotations != NULL) {
3713 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3714 annotations->at_put(i, runtime_visible_annotations[i]);
3715 }
3716 }
3717 if (runtime_invisible_annotations != NULL) {
3718 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3719 int append = runtime_visible_annotations_length+i;
3720 annotations->at_put(append, runtime_invisible_annotations[i]);
3721 }
3722 }
3723 }
3724 return annotations;
3725 }
3726
3727 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3728 const int super_class_index,
3729 const bool need_verify,
3730 TRAPS) {
3731 assert(cp != NULL, "invariant");
3732 const InstanceKlass* super_klass = NULL;
3733
3734 if (super_class_index == 0) {
3735 check_property(_class_name == vmSymbols::java_lang_Object(),
3736 "Invalid superclass index %u in class file %s",
3737 super_class_index,
3738 CHECK_NULL);
3739 } else {
3740 check_property(valid_klass_reference_at(super_class_index),
3741 "Invalid superclass index %u in class file %s",
3742 super_class_index,
3743 CHECK_NULL);
3744 // The class name should be legal because it is checked when parsing constant pool.
3745 // However, make sure it is not an array type.
3746 bool is_array = false;
3747 if (cp->tag_at(super_class_index).is_klass()) {
3748 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3749 if (need_verify)
3750 is_array = super_klass->is_array_klass();
3751 } else if (need_verify) {
3752 is_array = (cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3753 }
3754 if (need_verify) {
3755 guarantee_property(!is_array,
3756 "Bad superclass name in class file %s", CHECK_NULL);
3757 }
3758 }
3759 return super_klass;
3760 }
3761
3762 static unsigned int compute_oop_map_count(const InstanceKlass* super,
3763 unsigned int nonstatic_oop_map_count,
3764 int first_nonstatic_oop_offset) {
3765
3766 unsigned int map_count =
3767 NULL == super ? 0 : super->nonstatic_oop_map_count();
3768 if (nonstatic_oop_map_count > 0) {
3769 // We have oops to add to map
3770 if (map_count == 0) {
3771 map_count = nonstatic_oop_map_count;
3772 }
3773 else {
3774 // Check whether we should add a new map block or whether the last one can
3775 // be extended
3776 const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3777 const OopMapBlock* const last_map = first_map + map_count - 1;
3778
3779 const int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3780 if (next_offset == first_nonstatic_oop_offset) {
3781 // There is no gap bettwen superklass's last oop field and first
3782 // local oop field, merge maps.
3783 nonstatic_oop_map_count -= 1;
3784 }
3785 else {
3786 // Superklass didn't end with a oop field, add extra maps
3787 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3788 }
3789 map_count += nonstatic_oop_map_count;
3790 }
3791 }
3792 return map_count;
3793 }
3794
3795 #ifndef PRODUCT
3796 static void print_field_layout(const Symbol* name,
3797 Array<u2>* fields,
3798 const constantPoolHandle& cp,
3799 int instance_size,
3800 int instance_fields_start,
3801 int instance_fields_end,
3802 int static_fields_end) {
3803
3804 assert(name != NULL, "invariant");
3805
3806 tty->print("%s: field layout\n", name->as_klass_external_name());
3807 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3808 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3809 if (!fs.access_flags().is_static()) {
3810 tty->print(" @%3d \"%s\" %s\n",
3811 fs.offset(),
3812 fs.name()->as_klass_external_name(),
3813 fs.signature()->as_klass_external_name());
3814 }
3815 }
3816 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3817 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3818 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3819 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3820 if (fs.access_flags().is_static()) {
3821 tty->print(" @%3d \"%s\" %s\n",
3822 fs.offset(),
3823 fs.name()->as_klass_external_name(),
3824 fs.signature()->as_klass_external_name());
3825 }
3826 }
3827 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3828 tty->print("\n");
3829 }
3830 #endif
3831
3832 // Values needed for oopmap and InstanceKlass creation
3833 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3834 public:
3835 int* nonstatic_oop_offsets;
3836 unsigned int* nonstatic_oop_counts;
3837 unsigned int nonstatic_oop_map_count;
3838 unsigned int total_oop_map_count;
3839 int instance_size;
3840 int nonstatic_field_size;
3841 int static_field_size;
3842 bool has_nonstatic_fields;
3843 };
3844
3845 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3846 void ClassFileParser::layout_fields(ConstantPool* cp,
3847 const FieldAllocationCount* fac,
3848 const ClassAnnotationCollector* parsed_annotations,
3849 FieldLayoutInfo* info,
3850 TRAPS) {
3851
3852 assert(cp != NULL, "invariant");
3853
3854 // Field size and offset computation
3855 int nonstatic_field_size = _super_klass == NULL ? 0 :
3856 _super_klass->nonstatic_field_size();
3857
3858 // Count the contended fields by type.
3859 //
3860 // We ignore static fields, because @Contended is not supported for them.
3861 // The layout code below will also ignore the static fields.
3862 int nonstatic_contended_count = 0;
3863 FieldAllocationCount fac_contended;
3864 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3865 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3866 if (fs.is_contended()) {
3867 fac_contended.count[atype]++;
3868 if (!fs.access_flags().is_static()) {
3869 nonstatic_contended_count++;
3870 }
3871 }
3872 }
3873
3874
3875 // Calculate the starting byte offsets
3876 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3877 int next_static_double_offset = next_static_oop_offset +
3878 ((fac->count[STATIC_OOP]) * heapOopSize);
3879 if (fac->count[STATIC_DOUBLE]) {
3880 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
3881 }
3882
3883 int next_static_word_offset = next_static_double_offset +
3884 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3885 int next_static_short_offset = next_static_word_offset +
3886 ((fac->count[STATIC_WORD]) * BytesPerInt);
3887 int next_static_byte_offset = next_static_short_offset +
3888 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3889
3890 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3891 nonstatic_field_size * heapOopSize;
3892
3893 int next_nonstatic_field_offset = nonstatic_fields_start;
3894
3895 const bool is_contended_class = parsed_annotations->is_contended();
3896
3897 // Class is contended, pad before all the fields
3898 if (is_contended_class) {
3899 next_nonstatic_field_offset += ContendedPaddingWidth;
3900 }
3901
3902 // Compute the non-contended fields count.
3903 // The packing code below relies on these counts to determine if some field
3904 // can be squeezed into the alignment gap. Contended fields are obviously
3905 // exempt from that.
3906 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3907 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3908 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3909 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3910 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3911
3912 // Total non-static fields count, including every contended field
3913 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3914 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3915 fac->count[NONSTATIC_OOP];
3916
3917 const bool super_has_nonstatic_fields =
3918 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
3919 const bool has_nonstatic_fields =
3920 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3921
3922
3923 // Prepare list of oops for oop map generation.
3924 //
3925 // "offset" and "count" lists are describing the set of contiguous oop
3926 // regions. offset[i] is the start of the i-th region, which then has
3927 // count[i] oops following. Before we know how many regions are required,
3928 // we pessimistically allocate the maps to fit all the oops into the
3929 // distinct regions.
3930 //
3931 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3932 // to figure out if we still need to do this.
3933 unsigned int nonstatic_oop_map_count = 0;
3934 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3935
3936 int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3937 THREAD, int, max_nonstatic_oop_maps);
3938 unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3939 THREAD, unsigned int, max_nonstatic_oop_maps);
3940
3941 int first_nonstatic_oop_offset = 0; // will be set for first oop field
3942
3943 bool compact_fields = CompactFields;
3944 int allocation_style = FieldsAllocationStyle;
3945 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3946 assert(false, "0 <= FieldsAllocationStyle <= 2");
3947 allocation_style = 1; // Optimistic
3948 }
3949
3950 // The next classes have predefined hard-coded fields offsets
3951 // (see in JavaClasses::compute_hard_coded_offsets()).
3952 // Use default fields allocation order for them.
3953 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
3954 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3955 _class_name == vmSymbols::java_lang_Class() ||
3956 _class_name == vmSymbols::java_lang_ClassLoader() ||
3957 _class_name == vmSymbols::java_lang_ref_Reference() ||
3958 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3959 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3960 _class_name == vmSymbols::java_lang_String() ||
3961 _class_name == vmSymbols::java_lang_Throwable() ||
3962 _class_name == vmSymbols::java_lang_Boolean() ||
3963 _class_name == vmSymbols::java_lang_Character() ||
3964 _class_name == vmSymbols::java_lang_Float() ||
3965 _class_name == vmSymbols::java_lang_Double() ||
3966 _class_name == vmSymbols::java_lang_Byte() ||
3967 _class_name == vmSymbols::java_lang_Short() ||
3968 _class_name == vmSymbols::java_lang_Integer() ||
3969 _class_name == vmSymbols::java_lang_Long())) {
3970 allocation_style = 0; // Allocate oops first
3971 compact_fields = false; // Don't compact fields
3972 }
3973
3974 int next_nonstatic_oop_offset = 0;
3975 int next_nonstatic_double_offset = 0;
3976
3977 // Rearrange fields for a given allocation style
3978 if( allocation_style == 0 ) {
3979 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3980 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3981 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3982 (nonstatic_oop_count * heapOopSize);
3983 } else if( allocation_style == 1 ) {
3984 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3985 next_nonstatic_double_offset = next_nonstatic_field_offset;
3986 } else if( allocation_style == 2 ) {
3987 // Fields allocation: oops fields in super and sub classes are together.
3988 if( nonstatic_field_size > 0 && _super_klass != NULL &&
3989 _super_klass->nonstatic_oop_map_size() > 0 ) {
3990 const unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3991 const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps();
3992 const OopMapBlock* const last_map = first_map + map_count - 1;
3993 const int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3994 if (next_offset == next_nonstatic_field_offset) {
3995 allocation_style = 0; // allocate oops first
3996 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3997 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3998 (nonstatic_oop_count * heapOopSize);
3999 }
4000 }
4001 if( allocation_style == 2 ) {
4002 allocation_style = 1; // allocate oops last
4003 next_nonstatic_double_offset = next_nonstatic_field_offset;
4004 }
4005 } else {
4006 ShouldNotReachHere();
4007 }
4008
4009 int nonstatic_oop_space_count = 0;
4010 int nonstatic_word_space_count = 0;
4011 int nonstatic_short_space_count = 0;
4012 int nonstatic_byte_space_count = 0;
4013 int nonstatic_oop_space_offset = 0;
4014 int nonstatic_word_space_offset = 0;
4015 int nonstatic_short_space_offset = 0;
4016 int nonstatic_byte_space_offset = 0;
4017
4018 // Try to squeeze some of the fields into the gaps due to
4019 // long/double alignment.
4020 if (nonstatic_double_count > 0) {
4021 int offset = next_nonstatic_double_offset;
4022 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
4023 if (compact_fields && offset != next_nonstatic_double_offset) {
4024 // Allocate available fields into the gap before double field.
4025 int length = next_nonstatic_double_offset - offset;
4026 assert(length == BytesPerInt, "");
4027 nonstatic_word_space_offset = offset;
4028 if (nonstatic_word_count > 0) {
4029 nonstatic_word_count -= 1;
4030 nonstatic_word_space_count = 1; // Only one will fit
4031 length -= BytesPerInt;
4032 offset += BytesPerInt;
4033 }
4034 nonstatic_short_space_offset = offset;
4035 while (length >= BytesPerShort && nonstatic_short_count > 0) {
4036 nonstatic_short_count -= 1;
4037 nonstatic_short_space_count += 1;
4038 length -= BytesPerShort;
4039 offset += BytesPerShort;
4040 }
4041 nonstatic_byte_space_offset = offset;
4042 while (length > 0 && nonstatic_byte_count > 0) {
4043 nonstatic_byte_count -= 1;
4044 nonstatic_byte_space_count += 1;
4045 length -= 1;
4046 }
4047 // Allocate oop field in the gap if there are no other fields for that.
4048 nonstatic_oop_space_offset = offset;
4049 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
4050 allocation_style != 0) { // when oop fields not first
4051 nonstatic_oop_count -= 1;
4052 nonstatic_oop_space_count = 1; // Only one will fit
4053 length -= heapOopSize;
4054 offset += heapOopSize;
4055 }
4056 }
4057 }
4058
4059 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4060 (nonstatic_double_count * BytesPerLong);
4061 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4062 (nonstatic_word_count * BytesPerInt);
4063 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4064 (nonstatic_short_count * BytesPerShort);
4065 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4066 nonstatic_byte_count;
4067
4068 // let oops jump before padding with this allocation style
4069 if( allocation_style == 1 ) {
4070 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4071 if( nonstatic_oop_count > 0 ) {
4072 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4073 }
4074 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4075 }
4076
4077 // Iterate over fields again and compute correct offsets.
4078 // The field allocation type was temporarily stored in the offset slot.
4079 // oop fields are located before non-oop fields (static and non-static).
4080 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4081
4082 // skip already laid out fields
4083 if (fs.is_offset_set()) continue;
4084
4085 // contended instance fields are handled below
4086 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4087
4088 int real_offset = 0;
4089 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4090
4091 // pack the rest of the fields
4092 switch (atype) {
4093 case STATIC_OOP:
4094 real_offset = next_static_oop_offset;
4095 next_static_oop_offset += heapOopSize;
4096 break;
4097 case STATIC_BYTE:
4098 real_offset = next_static_byte_offset;
4099 next_static_byte_offset += 1;
4100 break;
4101 case STATIC_SHORT:
4102 real_offset = next_static_short_offset;
4103 next_static_short_offset += BytesPerShort;
4104 break;
4105 case STATIC_WORD:
4106 real_offset = next_static_word_offset;
4107 next_static_word_offset += BytesPerInt;
4108 break;
4109 case STATIC_DOUBLE:
4110 real_offset = next_static_double_offset;
4111 next_static_double_offset += BytesPerLong;
4112 break;
4113 case NONSTATIC_OOP:
4114 if( nonstatic_oop_space_count > 0 ) {
4115 real_offset = nonstatic_oop_space_offset;
4116 nonstatic_oop_space_offset += heapOopSize;
4117 nonstatic_oop_space_count -= 1;
4118 } else {
4119 real_offset = next_nonstatic_oop_offset;
4120 next_nonstatic_oop_offset += heapOopSize;
4121 }
4122
4123 // Record this oop in the oop maps
4124 if( nonstatic_oop_map_count > 0 &&
4125 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4126 real_offset -
4127 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4128 heapOopSize ) {
4129 // This oop is adjacent to the previous one, add to current oop map
4130 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4131 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4132 } else {
4133 // This oop is not adjacent to the previous one, create new oop map
4134 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4135 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4136 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4137 nonstatic_oop_map_count += 1;
4138 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4139 first_nonstatic_oop_offset = real_offset;
4140 }
4141 }
4142 break;
4143 case NONSTATIC_BYTE:
4144 if( nonstatic_byte_space_count > 0 ) {
4145 real_offset = nonstatic_byte_space_offset;
4146 nonstatic_byte_space_offset += 1;
4147 nonstatic_byte_space_count -= 1;
4148 } else {
4149 real_offset = next_nonstatic_byte_offset;
4150 next_nonstatic_byte_offset += 1;
4151 }
4152 break;
4153 case NONSTATIC_SHORT:
4154 if( nonstatic_short_space_count > 0 ) {
4155 real_offset = nonstatic_short_space_offset;
4156 nonstatic_short_space_offset += BytesPerShort;
4157 nonstatic_short_space_count -= 1;
4158 } else {
4159 real_offset = next_nonstatic_short_offset;
4160 next_nonstatic_short_offset += BytesPerShort;
4161 }
4162 break;
4163 case NONSTATIC_WORD:
4164 if( nonstatic_word_space_count > 0 ) {
4165 real_offset = nonstatic_word_space_offset;
4166 nonstatic_word_space_offset += BytesPerInt;
4167 nonstatic_word_space_count -= 1;
4168 } else {
4169 real_offset = next_nonstatic_word_offset;
4170 next_nonstatic_word_offset += BytesPerInt;
4171 }
4172 break;
4173 case NONSTATIC_DOUBLE:
4174 real_offset = next_nonstatic_double_offset;
4175 next_nonstatic_double_offset += BytesPerLong;
4176 break;
4177 default:
4178 ShouldNotReachHere();
4179 }
4180 fs.set_offset(real_offset);
4181 }
4182
4183
4184 // Handle the contended cases.
4185 //
4186 // Each contended field should not intersect the cache line with another contended field.
4187 // In the absence of alignment information, we end up with pessimistically separating
4188 // the fields with full-width padding.
4189 //
4190 // Additionally, this should not break alignment for the fields, so we round the alignment up
4191 // for each field.
4192 if (nonstatic_contended_count > 0) {
4193
4194 // if there is at least one contended field, we need to have pre-padding for them
4195 next_nonstatic_padded_offset += ContendedPaddingWidth;
4196
4197 // collect all contended groups
4198 ResourceBitMap bm(cp->size());
4199 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4200 // skip already laid out fields
4201 if (fs.is_offset_set()) continue;
4202
4203 if (fs.is_contended()) {
4204 bm.set_bit(fs.contended_group());
4205 }
4206 }
4207
4208 int current_group = -1;
4209 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4210
4211 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4212
4213 // skip already laid out fields
4214 if (fs.is_offset_set()) continue;
4215
4216 // skip non-contended fields and fields from different group
4217 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4218
4219 // handle statics below
4220 if (fs.access_flags().is_static()) continue;
4221
4222 int real_offset = 0;
4223 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4224
4225 switch (atype) {
4226 case NONSTATIC_BYTE:
4227 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4228 real_offset = next_nonstatic_padded_offset;
4229 next_nonstatic_padded_offset += 1;
4230 break;
4231
4232 case NONSTATIC_SHORT:
4233 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4234 real_offset = next_nonstatic_padded_offset;
4235 next_nonstatic_padded_offset += BytesPerShort;
4236 break;
4237
4238 case NONSTATIC_WORD:
4239 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4240 real_offset = next_nonstatic_padded_offset;
4241 next_nonstatic_padded_offset += BytesPerInt;
4242 break;
4243
4244 case NONSTATIC_DOUBLE:
4245 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4246 real_offset = next_nonstatic_padded_offset;
4247 next_nonstatic_padded_offset += BytesPerLong;
4248 break;
4249
4250 case NONSTATIC_OOP:
4251 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4252 real_offset = next_nonstatic_padded_offset;
4253 next_nonstatic_padded_offset += heapOopSize;
4254
4255 // Record this oop in the oop maps
4256 if( nonstatic_oop_map_count > 0 &&
4257 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4258 real_offset -
4259 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4260 heapOopSize ) {
4261 // This oop is adjacent to the previous one, add to current oop map
4262 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4263 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4264 } else {
4265 // This oop is not adjacent to the previous one, create new oop map
4266 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4267 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4268 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4269 nonstatic_oop_map_count += 1;
4270 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4271 first_nonstatic_oop_offset = real_offset;
4272 }
4273 }
4274 break;
4275
4276 default:
4277 ShouldNotReachHere();
4278 }
4279
4280 if (fs.contended_group() == 0) {
4281 // Contended group defines the equivalence class over the fields:
4282 // the fields within the same contended group are not inter-padded.
4283 // The only exception is default group, which does not incur the
4284 // equivalence, and so requires intra-padding.
4285 next_nonstatic_padded_offset += ContendedPaddingWidth;
4286 }
4287
4288 fs.set_offset(real_offset);
4289 } // for
4290
4291 // Start laying out the next group.
4292 // Note that this will effectively pad the last group in the back;
4293 // this is expected to alleviate memory contention effects for
4294 // subclass fields and/or adjacent object.
4295 // If this was the default group, the padding is already in place.
4296 if (current_group != 0) {
4297 next_nonstatic_padded_offset += ContendedPaddingWidth;
4298 }
4299 }
4300
4301 // handle static fields
4302 }
4303
4304 // Entire class is contended, pad in the back.
4305 // This helps to alleviate memory contention effects for subclass fields
4306 // and/or adjacent object.
4307 if (is_contended_class) {
4308 next_nonstatic_padded_offset += ContendedPaddingWidth;
4309 }
4310
4311 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4312
4313 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize);
4314 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4315 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4316
4317 int static_field_size = (static_fields_end -
4318 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4319 nonstatic_field_size = nonstatic_field_size +
4320 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4321
4322 int instance_size = align_object_size(instance_end / wordSize);
4323
4324 assert(instance_size == align_object_size(align_up(
4325 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
4326 wordSize) / wordSize), "consistent layout helper value");
4327
4328 // Invariant: nonstatic_field end/start should only change if there are
4329 // nonstatic fields in the class, or if the class is contended. We compare
4330 // against the non-aligned value, so that end alignment will not fail the
4331 // assert without actually having the fields.
4332 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4333 is_contended_class ||
4334 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4335
4336 // Number of non-static oop map blocks allocated at end of klass.
4337 const unsigned int total_oop_map_count =
4338 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
4339 first_nonstatic_oop_offset);
4340
4341 #ifndef PRODUCT
4342 if (PrintFieldLayout) {
4343 print_field_layout(_class_name,
4344 _fields,
4345 cp,
4346 instance_size,
4347 nonstatic_fields_start,
4348 nonstatic_fields_end,
4349 static_fields_end);
4350 }
4351
4352 #endif
4353 // Pass back information needed for InstanceKlass creation
4354 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
4355 info->nonstatic_oop_counts = nonstatic_oop_counts;
4356 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
4357 info->total_oop_map_count = total_oop_map_count;
4358 info->instance_size = instance_size;
4359 info->static_field_size = static_field_size;
4360 info->nonstatic_field_size = nonstatic_field_size;
4361 info->has_nonstatic_fields = has_nonstatic_fields;
4362 }
4363
4364 static void fill_oop_maps(const InstanceKlass* k,
4365 unsigned int nonstatic_oop_map_count,
4366 const int* nonstatic_oop_offsets,
4367 const unsigned int* nonstatic_oop_counts) {
4368
4369 assert(k != NULL, "invariant");
4370
4371 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4372 const InstanceKlass* const super = k->superklass();
4373 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4374 if (super_count > 0) {
4375 // Copy maps from superklass
4376 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4377 for (unsigned int i = 0; i < super_count; ++i) {
4378 *this_oop_map++ = *super_oop_map++;
4379 }
4380 }
4381
4382 if (nonstatic_oop_map_count > 0) {
4383 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4384 // The counts differ because there is no gap between superklass's last oop
4385 // field and the first local oop field. Extend the last oop map copied
4386 // from the superklass instead of creating new one.
4387 nonstatic_oop_map_count--;
4388 nonstatic_oop_offsets++;
4389 this_oop_map--;
4390 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4391 this_oop_map++;
4392 }
4393
4394 // Add new map blocks, fill them
4395 while (nonstatic_oop_map_count-- > 0) {
4396 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4397 this_oop_map->set_count(*nonstatic_oop_counts++);
4398 this_oop_map++;
4399 }
4400 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4401 this_oop_map, "sanity");
4402 }
4403 }
4404
4405
4406 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4407 assert(ik != NULL, "invariant");
4408
4409 const Klass* const super = ik->super();
4410
4411 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4412 // in which case we don't have to register objects as finalizable
4413 if (!_has_empty_finalizer) {
4414 if (_has_finalizer ||
4415 (super != NULL && super->has_finalizer())) {
4416 ik->set_has_finalizer();
4417 }
4418 }
4419
4420 #ifdef ASSERT
4421 bool f = false;
4422 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4423 vmSymbols::void_method_signature());
4424 if (m != NULL && !m->is_empty_method()) {
4425 f = true;
4426 }
4427
4428 // Spec doesn't prevent agent from redefinition of empty finalizer.
4429 // Despite the fact that it's generally bad idea and redefined finalizer
4430 // will not work as expected we shouldn't abort vm in this case
4431 if (!ik->has_redefined_this_or_super()) {
4432 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4433 }
4434 #endif
4435
4436 // Check if this klass supports the java.lang.Cloneable interface
4437 if (SystemDictionary::Cloneable_klass_loaded()) {
4438 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4439 ik->set_is_cloneable();
4440 }
4441 }
4442
4443 // Check if this klass has a vanilla default constructor
4444 if (super == NULL) {
4445 // java.lang.Object has empty default constructor
4446 ik->set_has_vanilla_constructor();
4447 } else {
4448 if (super->has_vanilla_constructor() &&
4449 _has_vanilla_constructor) {
4450 ik->set_has_vanilla_constructor();
4451 }
4452 #ifdef ASSERT
4453 bool v = false;
4454 if (super->has_vanilla_constructor()) {
4455 const Method* const constructor =
4456 ik->find_method(vmSymbols::object_initializer_name(),
4457 vmSymbols::void_method_signature());
4458 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4459 v = true;
4460 }
4461 }
4462 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4463 #endif
4464 }
4465
4466 // If it cannot be fast-path allocated, set a bit in the layout helper.
4467 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4468 assert(ik->size_helper() > 0, "layout_helper is initialized");
4469 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4470 || ik->is_abstract() || ik->is_interface()
4471 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4472 || ik->size_helper() >= FastAllocateSizeLimit) {
4473 // Forbid fast-path allocation.
4474 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4475 ik->set_layout_helper(lh);
4476 }
4477 }
4478
4479 // Attach super classes and interface classes to class loader data
4480 static void record_defined_class_dependencies(const InstanceKlass* defined_klass,
4481 TRAPS) {
4482 assert(defined_klass != NULL, "invariant");
4483
4484 ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data();
4485 if (defining_loader_data->is_the_null_class_loader_data()) {
4486 // Dependencies to null class loader data are implicit.
4487 return;
4488 } else {
4489 // add super class dependency
4490 Klass* const super = defined_klass->super();
4491 if (super != NULL) {
4492 defining_loader_data->record_dependency(super);
4493 }
4494
4495 // add super interface dependencies
4496 const Array<Klass*>* const local_interfaces = defined_klass->local_interfaces();
4497 if (local_interfaces != NULL) {
4498 const int length = local_interfaces->length();
4499 for (int i = 0; i < length; i++) {
4500 defining_loader_data->record_dependency(local_interfaces->at(i));
4501 }
4502 }
4503 }
4504 }
4505
4506 // utility methods for appending an array with check for duplicates
4507
4508 static void append_interfaces(GrowableArray<Klass*>* result,
4509 const Array<Klass*>* const ifs) {
4510 // iterate over new interfaces
4511 for (int i = 0; i < ifs->length(); i++) {
4512 Klass* const e = ifs->at(i);
4513 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4514 // add new interface
4515 result->append_if_missing(e);
4516 }
4517 }
4518
4519 static Array<Klass*>* compute_transitive_interfaces(const InstanceKlass* super,
4520 Array<Klass*>* local_ifs,
4521 ClassLoaderData* loader_data,
4522 TRAPS) {
4523 assert(local_ifs != NULL, "invariant");
4524 assert(loader_data != NULL, "invariant");
4525
4526 // Compute maximum size for transitive interfaces
4527 int max_transitive_size = 0;
4528 int super_size = 0;
4529 // Add superclass transitive interfaces size
4530 if (super != NULL) {
4531 super_size = super->transitive_interfaces()->length();
4532 max_transitive_size += super_size;
4533 }
4534 // Add local interfaces' super interfaces
4535 const int local_size = local_ifs->length();
4536 for (int i = 0; i < local_size; i++) {
4537 Klass* const l = local_ifs->at(i);
4538 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4539 }
4540 // Finally add local interfaces
4541 max_transitive_size += local_size;
4542 // Construct array
4543 if (max_transitive_size == 0) {
4544 // no interfaces, use canonicalized array
4545 return Universe::the_empty_klass_array();
4546 } else if (max_transitive_size == super_size) {
4547 // no new local interfaces added, share superklass' transitive interface array
4548 return super->transitive_interfaces();
4549 } else if (max_transitive_size == local_size) {
4550 // only local interfaces added, share local interface array
4551 return local_ifs;
4552 } else {
4553 ResourceMark rm;
4554 GrowableArray<Klass*>* const result = new GrowableArray<Klass*>(max_transitive_size);
4555
4556 // Copy down from superclass
4557 if (super != NULL) {
4558 append_interfaces(result, super->transitive_interfaces());
4559 }
4560
4561 // Copy down from local interfaces' superinterfaces
4562 for (int i = 0; i < local_size; i++) {
4563 Klass* const l = local_ifs->at(i);
4564 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4565 }
4566 // Finally add local interfaces
4567 append_interfaces(result, local_ifs);
4568
4569 // length will be less than the max_transitive_size if duplicates were removed
4570 const int length = result->length();
4571 assert(length <= max_transitive_size, "just checking");
4572 Array<Klass*>* const new_result =
4573 MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL);
4574 for (int i = 0; i < length; i++) {
4575 Klass* const e = result->at(i);
4576 assert(e != NULL, "just checking");
4577 new_result->at_put(i, e);
4578 }
4579 return new_result;
4580 }
4581 }
4582
4583 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4584 assert(this_klass != NULL, "invariant");
4585 const Klass* const super = this_klass->super();
4586 if (super != NULL) {
4587
4588 // If the loader is not the boot loader then throw an exception if its
4589 // superclass is in package jdk.internal.reflect and its loader is not a
4590 // special reflection class loader
4591 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4592 assert(super->is_instance_klass(), "super is not instance klass");
4593 PackageEntry* super_package = super->package();
4594 if (super_package != NULL &&
4595 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4596 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4597 ResourceMark rm(THREAD);
4598 Exceptions::fthrow(
4599 THREAD_AND_LOCATION,
4600 vmSymbols::java_lang_IllegalAccessError(),
4601 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4602 this_klass->external_name(),
4603 this_klass->class_loader_data()->loader_name_and_id(),
4604 super->external_name());
4605 return;
4606 }
4607 }
4608
4609 Reflection::VerifyClassAccessResults vca_result =
4610 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4611 if (vca_result != Reflection::ACCESS_OK) {
4612 ResourceMark rm(THREAD);
4613 char* msg = Reflection::verify_class_access_msg(this_klass,
4614 InstanceKlass::cast(super),
4615 vca_result);
4616 if (msg == NULL) {
4617 Exceptions::fthrow(
4618 THREAD_AND_LOCATION,
4619 vmSymbols::java_lang_IllegalAccessError(),
4620 "class %s cannot access its superclass %s",
4621 this_klass->external_name(),
4622 super->external_name());
4623 } else {
4624 // Add additional message content.
4625 Exceptions::fthrow(
4626 THREAD_AND_LOCATION,
4627 vmSymbols::java_lang_IllegalAccessError(),
4628 "superclass access check failed: %s",
4629 msg);
4630 }
4631 }
4632 }
4633 }
4634
4635
4636 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4637 assert(this_klass != NULL, "invariant");
4638 const Array<Klass*>* const local_interfaces = this_klass->local_interfaces();
4639 const int lng = local_interfaces->length();
4640 for (int i = lng - 1; i >= 0; i--) {
4641 Klass* const k = local_interfaces->at(i);
4642 assert (k != NULL && k->is_interface(), "invalid interface");
4643 Reflection::VerifyClassAccessResults vca_result =
4644 Reflection::verify_class_access(this_klass, InstanceKlass::cast(k), false);
4645 if (vca_result != Reflection::ACCESS_OK) {
4646 ResourceMark rm(THREAD);
4647 char* msg = Reflection::verify_class_access_msg(this_klass,
4648 InstanceKlass::cast(k),
4649 vca_result);
4650 if (msg == NULL) {
4651 Exceptions::fthrow(
4652 THREAD_AND_LOCATION,
4653 vmSymbols::java_lang_IllegalAccessError(),
4654 "class %s cannot access its superinterface %s",
4655 this_klass->external_name(),
4656 k->external_name());
4657 } else {
4658 // Add additional message content.
4659 Exceptions::fthrow(
4660 THREAD_AND_LOCATION,
4661 vmSymbols::java_lang_IllegalAccessError(),
4662 "superinterface check failed: %s",
4663 msg);
4664 }
4665 }
4666 }
4667 }
4668
4669
4670 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4671 assert(this_klass != NULL, "invariant");
4672 const Array<Method*>* const methods = this_klass->methods();
4673 const int num_methods = methods->length();
4674
4675 // go thru each method and check if it overrides a final method
4676 for (int index = 0; index < num_methods; index++) {
4677 const Method* const m = methods->at(index);
4678
4679 // skip private, static, and <init> methods
4680 if ((!m->is_private() && !m->is_static()) &&
4681 (m->name() != vmSymbols::object_initializer_name())) {
4682
4683 const Symbol* const name = m->name();
4684 const Symbol* const signature = m->signature();
4685 const Klass* k = this_klass->super();
4686 const Method* super_m = NULL;
4687 while (k != NULL) {
4688 // skip supers that don't have final methods.
4689 if (k->has_final_method()) {
4690 // lookup a matching method in the super class hierarchy
4691 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4692 if (super_m == NULL) {
4693 break; // didn't find any match; get out
4694 }
4695
4696 if (super_m->is_final() && !super_m->is_static() &&
4697 !super_m->access_flags().is_private()) {
4698 // matching method in super is final, and not static or private
4699 bool can_access = Reflection::verify_member_access(this_klass,
4700 super_m->method_holder(),
4701 super_m->method_holder(),
4702 super_m->access_flags(),
4703 false, false, CHECK);
4704 if (can_access) {
4705 // this class can access super final method and therefore override
4706 ResourceMark rm(THREAD);
4707 Exceptions::fthrow(THREAD_AND_LOCATION,
4708 vmSymbols::java_lang_VerifyError(),
4709 "class %s overrides final method %s.%s%s",
4710 this_klass->external_name(),
4711 super_m->method_holder()->external_name(),
4712 name->as_C_string(),
4713 signature->as_C_string()
4714 );
4715 return;
4716 }
4717 }
4718
4719 // continue to look from super_m's holder's super.
4720 k = super_m->method_holder()->super();
4721 continue;
4722 }
4723
4724 k = k->super();
4725 }
4726 }
4727 }
4728 }
4729
4730
4731 // assumes that this_klass is an interface
4732 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4733 assert(this_klass != NULL, "invariant");
4734 assert(this_klass->is_interface(), "not an interface");
4735 const Array<Method*>* methods = this_klass->methods();
4736 const int num_methods = methods->length();
4737
4738 for (int index = 0; index < num_methods; index++) {
4739 const Method* const m = methods->at(index);
4740 // if m is static and not the init method, throw a verify error
4741 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4742 ResourceMark rm(THREAD);
4743 Exceptions::fthrow(
4744 THREAD_AND_LOCATION,
4745 vmSymbols::java_lang_VerifyError(),
4746 "Illegal static method %s in interface %s",
4747 m->name()->as_C_string(),
4748 this_klass->external_name()
4749 );
4750 return;
4751 }
4752 }
4753 }
4754
4755 // utility methods for format checking
4756
4757 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4758 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4759 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4760 if (is_module) {
4761 ResourceMark rm(THREAD);
4762 Exceptions::fthrow(
4763 THREAD_AND_LOCATION,
4764 vmSymbols::java_lang_NoClassDefFoundError(),
4765 "%s is not a class because access_flag ACC_MODULE is set",
4766 _class_name->as_C_string());
4767 return;
4768 }
4769
4770 if (!_need_verify) { return; }
4771
4772 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4773 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4774 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4775 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4776 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4777 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4778 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4779
4780 if ((is_abstract && is_final) ||
4781 (is_interface && !is_abstract) ||
4782 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4783 (!is_interface && major_gte_15 && is_annotation)) {
4784 ResourceMark rm(THREAD);
4785 Exceptions::fthrow(
4786 THREAD_AND_LOCATION,
4787 vmSymbols::java_lang_ClassFormatError(),
4788 "Illegal class modifiers in class %s: 0x%X",
4789 _class_name->as_C_string(), flags
4790 );
4791 return;
4792 }
4793 }
4794
4795 static bool has_illegal_visibility(jint flags) {
4796 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4797 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4798 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4799
4800 return ((is_public && is_protected) ||
4801 (is_public && is_private) ||
4802 (is_protected && is_private));
4803 }
4804
4805 // A legal major_version.minor_version must be one of the following:
4806 //
4807 // Major_version = 45, any minor_version.
4808 // Major_version >= 46 and major_version <= current_major_version and minor_version = 0.
4809 // Major_version = current_major_version and minor_version = 65535 and --enable-preview is present.
4810 //
4811 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4812 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4813 if (major != JAVA_MIN_SUPPORTED_VERSION) { // All 45.* are ok including 45.65535
4814 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4815 if (major != max_version) {
4816 ResourceMark rm(THREAD);
4817 Exceptions::fthrow(
4818 THREAD_AND_LOCATION,
4819 vmSymbols::java_lang_UnsupportedClassVersionError(),
4820 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4821 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4822 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4823 return;
4824 }
4825
4826 if (!Arguments::enable_preview()) {
4827 ResourceMark rm(THREAD);
4828 Exceptions::fthrow(
4829 THREAD_AND_LOCATION,
4830 vmSymbols::java_lang_UnsupportedClassVersionError(),
4831 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4832 class_name->as_C_string(), major, minor);
4833 return;
4834 }
4835
4836 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4837 if (major > max_version) {
4838 ResourceMark rm(THREAD);
4839 Exceptions::fthrow(
4840 THREAD_AND_LOCATION,
4841 vmSymbols::java_lang_UnsupportedClassVersionError(),
4842 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4843 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4844 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4845 } else if (major < JAVA_MIN_SUPPORTED_VERSION) {
4846 ResourceMark rm(THREAD);
4847 Exceptions::fthrow(
4848 THREAD_AND_LOCATION,
4849 vmSymbols::java_lang_UnsupportedClassVersionError(),
4850 "%s (class file version %u.%u) was compiled with an invalid major version",
4851 class_name->as_C_string(), major, minor);
4852 } else if (minor != 0) {
4853 ResourceMark rm(THREAD);
4854 Exceptions::fthrow(
4855 THREAD_AND_LOCATION,
4856 vmSymbols::java_lang_UnsupportedClassVersionError(),
4857 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4858 class_name->as_C_string(), major, minor);
4859 }
4860 }
4861 }
4862 }
4863
4864 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4865 bool is_interface,
4866 TRAPS) const {
4867 if (!_need_verify) { return; }
4868
4869 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4870 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4871 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4872 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4873 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4874 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4875 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4876 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4877 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4878
4879 bool is_illegal = false;
4880
4881 if (is_interface) {
4882 if (!is_public || !is_static || !is_final || is_private ||
4883 is_protected || is_volatile || is_transient ||
4884 (major_gte_15 && is_enum)) {
4885 is_illegal = true;
4886 }
4887 } else { // not interface
4888 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4889 is_illegal = true;
4890 }
4891 }
4892
4893 if (is_illegal) {
4894 ResourceMark rm(THREAD);
4895 Exceptions::fthrow(
4896 THREAD_AND_LOCATION,
4897 vmSymbols::java_lang_ClassFormatError(),
4898 "Illegal field modifiers in class %s: 0x%X",
4899 _class_name->as_C_string(), flags);
4900 return;
4901 }
4902 }
4903
4904 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4905 bool is_interface,
4906 const Symbol* name,
4907 TRAPS) const {
4908 if (!_need_verify) { return; }
4909
4910 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4911 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4912 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4913 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4914 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4915 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4916 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4917 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4918 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4919 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4920 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4921 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4922 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4923
4924 bool is_illegal = false;
4925
4926 if (is_interface) {
4927 if (major_gte_8) {
4928 // Class file version is JAVA_8_VERSION or later Methods of
4929 // interfaces may set any of the flags except ACC_PROTECTED,
4930 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4931 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4932 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4933 (is_native || is_protected || is_final || is_synchronized) ||
4934 // If a specific method of a class or interface has its
4935 // ACC_ABSTRACT flag set, it must not have any of its
4936 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4937 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4938 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4939 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4940 (is_abstract && (is_private || is_static || is_strict))) {
4941 is_illegal = true;
4942 }
4943 } else if (major_gte_15) {
4944 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4945 if (!is_public || is_private || is_protected || is_static || is_final ||
4946 is_synchronized || is_native || !is_abstract || is_strict) {
4947 is_illegal = true;
4948 }
4949 } else {
4950 // Class file version is pre-JAVA_1_5_VERSION
4951 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4952 is_illegal = true;
4953 }
4954 }
4955 } else { // not interface
4956 if (has_illegal_visibility(flags)) {
4957 is_illegal = true;
4958 } else {
4959 if (is_initializer) {
4960 if (is_static || is_final || is_synchronized || is_native ||
4961 is_abstract || (major_gte_15 && is_bridge)) {
4962 is_illegal = true;
4963 }
4964 } else { // not initializer
4965 if (is_abstract) {
4966 if ((is_final || is_native || is_private || is_static ||
4967 (major_gte_15 && (is_synchronized || is_strict)))) {
4968 is_illegal = true;
4969 }
4970 }
4971 }
4972 }
4973 }
4974
4975 if (is_illegal) {
4976 ResourceMark rm(THREAD);
4977 Exceptions::fthrow(
4978 THREAD_AND_LOCATION,
4979 vmSymbols::java_lang_ClassFormatError(),
4980 "Method %s in class %s has illegal modifiers: 0x%X",
4981 name->as_C_string(), _class_name->as_C_string(), flags);
4982 return;
4983 }
4984 }
4985
4986 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4987 int length,
4988 TRAPS) const {
4989 assert(_need_verify, "only called when _need_verify is true");
4990 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
4991 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4992 }
4993 }
4994
4995 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4996 // In class names, '/' separates unqualified names. This is verified in this function also.
4997 // Method names also may not contain the characters '<' or '>', unless <init>
4998 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4999 // method. Because these names have been checked as special cases before
5000 // calling this method in verify_legal_method_name.
5001 //
5002 // This method is also called from the modular system APIs in modules.cpp
5003 // to verify the validity of module and package names.
5004 bool ClassFileParser::verify_unqualified_name(const char* name,
5005 unsigned int length,
5006 int type) {
5007 for (const char* p = name; p != name + length;) {
5008 jchar ch = *p;
5009 if (ch < 128) {
5010 if (ch == '.' || ch == ';' || ch == '[' ) {
5011 return false; // do not permit '.', ';', or '['
5012 }
5013 if (ch == '/') {
5014 // check for '//' or leading or trailing '/' which are not legal
5015 // unqualified name must not be empty
5016 if (type == ClassFileParser::LegalClass) {
5017 if (p == name || p+1 >= name+length || *(p+1) == '/') {
5018 return false;
5019 }
5020 } else {
5021 return false; // do not permit '/' unless it's class name
5022 }
5023 }
5024 if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) {
5025 return false; // do not permit '<' or '>' in method names
5026 }
5027 p++;
5028 } else {
5029 char* tmp_p = UTF8::next(p, &ch);
5030 p = tmp_p;
5031 }
5032 }
5033 return true;
5034 }
5035
5036 // Take pointer to a string. Skip over the longest part of the string that could
5037 // be taken as a fieldname. Allow '/' if slash_ok is true.
5038 // Return a pointer to just past the fieldname.
5039 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5040 // being true, we saw consecutive slashes (meaning we were looking for a
5041 // qualified path but found something that was badly-formed).
5042 static const char* skip_over_field_name(const char* name,
5043 bool slash_ok,
5044 unsigned int length) {
5045 const char* p;
5046 jboolean last_is_slash = false;
5047 jboolean not_first_ch = false;
5048
5049 for (p = name; p != name + length; not_first_ch = true) {
5050 const char* old_p = p;
5051 jchar ch = *p;
5052 if (ch < 128) {
5053 p++;
5054 // quick check for ascii
5055 if ((ch >= 'a' && ch <= 'z') ||
5056 (ch >= 'A' && ch <= 'Z') ||
5057 (ch == '_' || ch == '$') ||
5058 (not_first_ch && ch >= '0' && ch <= '9')) {
5059 last_is_slash = false;
5060 continue;
5061 }
5062 if (slash_ok && ch == '/') {
5063 if (last_is_slash) {
5064 return NULL; // Don't permit consecutive slashes
5065 }
5066 last_is_slash = true;
5067 continue;
5068 }
5069 }
5070 else {
5071 jint unicode_ch;
5072 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5073 p = tmp_p;
5074 last_is_slash = false;
5075 // Check if ch is Java identifier start or is Java identifier part
5076 // 4672820: call java.lang.Character methods directly without generating separate tables.
5077 EXCEPTION_MARK;
5078
5079 // return value
5080 JavaValue result(T_BOOLEAN);
5081 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5082 JavaCallArguments args;
5083 args.push_int(unicode_ch);
5084
5085 // public static boolean isJavaIdentifierStart(char ch);
5086 JavaCalls::call_static(&result,
5087 SystemDictionary::Character_klass(),
5088 vmSymbols::isJavaIdentifierStart_name(),
5089 vmSymbols::int_bool_signature(),
5090 &args,
5091 THREAD);
5092
5093 if (HAS_PENDING_EXCEPTION) {
5094 CLEAR_PENDING_EXCEPTION;
5095 return 0;
5096 }
5097 if (result.get_jboolean()) {
5098 continue;
5099 }
5100
5101 if (not_first_ch) {
5102 // public static boolean isJavaIdentifierPart(char ch);
5103 JavaCalls::call_static(&result,
5104 SystemDictionary::Character_klass(),
5105 vmSymbols::isJavaIdentifierPart_name(),
5106 vmSymbols::int_bool_signature(),
5107 &args,
5108 THREAD);
5109
5110 if (HAS_PENDING_EXCEPTION) {
5111 CLEAR_PENDING_EXCEPTION;
5112 return 0;
5113 }
5114
5115 if (result.get_jboolean()) {
5116 continue;
5117 }
5118 }
5119 }
5120 return (not_first_ch) ? old_p : NULL;
5121 }
5122 return (not_first_ch) ? p : NULL;
5123 }
5124
5125 // Take pointer to a string. Skip over the longest part of the string that could
5126 // be taken as a field signature. Allow "void" if void_ok.
5127 // Return a pointer to just past the signature.
5128 // Return NULL if no legal signature is found.
5129 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5130 bool void_ok,
5131 unsigned int length,
5132 TRAPS) const {
5133 unsigned int array_dim = 0;
5134 while (length > 0) {
5135 switch (signature[0]) {
5136 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5137 case JVM_SIGNATURE_BOOLEAN:
5138 case JVM_SIGNATURE_BYTE:
5139 case JVM_SIGNATURE_CHAR:
5140 case JVM_SIGNATURE_SHORT:
5141 case JVM_SIGNATURE_INT:
5142 case JVM_SIGNATURE_FLOAT:
5143 case JVM_SIGNATURE_LONG:
5144 case JVM_SIGNATURE_DOUBLE:
5145 return signature + 1;
5146 case JVM_SIGNATURE_CLASS: {
5147 if (_major_version < JAVA_1_5_VERSION) {
5148 // Skip over the class name if one is there
5149 const char* const p = skip_over_field_name(signature + 1, true, --length);
5150
5151 // The next character better be a semicolon
5152 if (p && (p - signature) > 1 && p[0] == ';') {
5153 return p + 1;
5154 }
5155 }
5156 else {
5157 // Skip leading 'L' and ignore first appearance of ';'
5158 length--;
5159 signature++;
5160 char* c = strchr((char*) signature, ';');
5161 // Format check signature
5162 if (c != NULL) {
5163 ResourceMark rm(THREAD);
5164 int newlen = c - (char*) signature;
5165 char* sig = NEW_RESOURCE_ARRAY(char, newlen + 1);
5166 strncpy(sig, signature, newlen);
5167 sig[newlen] = '\0';
5168
5169 bool legal = verify_unqualified_name(sig, newlen, LegalClass);
5170 if (!legal) {
5171 classfile_parse_error("Class name contains illegal character "
5172 "in descriptor in class file %s",
5173 CHECK_0);
5174 return NULL;
5175 }
5176 return signature + newlen + 1;
5177 }
5178 }
5179 return NULL;
5180 }
5181 case JVM_SIGNATURE_ARRAY:
5182 array_dim++;
5183 if (array_dim > 255) {
5184 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5185 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5186 }
5187 // The rest of what's there better be a legal signature
5188 signature++;
5189 length--;
5190 void_ok = false;
5191 break;
5192 default:
5193 return NULL;
5194 }
5195 }
5196 return NULL;
5197 }
5198
5199 // Checks if name is a legal class name.
5200 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5201 if (!_need_verify || _relax_verify) { return; }
5202
5203 char buf[fixed_buffer_size];
5204 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5205 unsigned int length = name->utf8_length();
5206 bool legal = false;
5207
5208 if (length > 0) {
5209 const char* p;
5210 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5211 p = skip_over_field_signature(bytes, false, length, CHECK);
5212 legal = (p != NULL) && ((p - bytes) == (int)length);
5213 } else if (_major_version < JAVA_1_5_VERSION) {
5214 if (bytes[0] != '<') {
5215 p = skip_over_field_name(bytes, true, length);
5216 legal = (p != NULL) && ((p - bytes) == (int)length);
5217 }
5218 } else {
5219 // 4900761: relax the constraints based on JSR202 spec
5220 // Class names may be drawn from the entire Unicode character set.
5221 // Identifiers between '/' must be unqualified names.
5222 // The utf8 string has been verified when parsing cpool entries.
5223 legal = verify_unqualified_name(bytes, length, LegalClass);
5224 }
5225 }
5226 if (!legal) {
5227 ResourceMark rm(THREAD);
5228 assert(_class_name != NULL, "invariant");
5229 Exceptions::fthrow(
5230 THREAD_AND_LOCATION,
5231 vmSymbols::java_lang_ClassFormatError(),
5232 "Illegal class name \"%s\" in class file %s", bytes,
5233 _class_name->as_C_string()
5234 );
5235 return;
5236 }
5237 }
5238
5239 // Checks if name is a legal field name.
5240 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5241 if (!_need_verify || _relax_verify) { return; }
5242
5243 char buf[fixed_buffer_size];
5244 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5245 unsigned int length = name->utf8_length();
5246 bool legal = false;
5247
5248 if (length > 0) {
5249 if (_major_version < JAVA_1_5_VERSION) {
5250 if (bytes[0] != '<') {
5251 const char* p = skip_over_field_name(bytes, false, length);
5252 legal = (p != NULL) && ((p - bytes) == (int)length);
5253 }
5254 } else {
5255 // 4881221: relax the constraints based on JSR202 spec
5256 legal = verify_unqualified_name(bytes, length, LegalField);
5257 }
5258 }
5259
5260 if (!legal) {
5261 ResourceMark rm(THREAD);
5262 assert(_class_name != NULL, "invariant");
5263 Exceptions::fthrow(
5264 THREAD_AND_LOCATION,
5265 vmSymbols::java_lang_ClassFormatError(),
5266 "Illegal field name \"%s\" in class %s", bytes,
5267 _class_name->as_C_string()
5268 );
5269 return;
5270 }
5271 }
5272
5273 // Checks if name is a legal method name.
5274 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5275 if (!_need_verify || _relax_verify) { return; }
5276
5277 assert(name != NULL, "method name is null");
5278 char buf[fixed_buffer_size];
5279 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5280 unsigned int length = name->utf8_length();
5281 bool legal = false;
5282
5283 if (length > 0) {
5284 if (bytes[0] == '<') {
5285 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5286 legal = true;
5287 }
5288 } else if (_major_version < JAVA_1_5_VERSION) {
5289 const char* p;
5290 p = skip_over_field_name(bytes, false, length);
5291 legal = (p != NULL) && ((p - bytes) == (int)length);
5292 } else {
5293 // 4881221: relax the constraints based on JSR202 spec
5294 legal = verify_unqualified_name(bytes, length, LegalMethod);
5295 }
5296 }
5297
5298 if (!legal) {
5299 ResourceMark rm(THREAD);
5300 assert(_class_name != NULL, "invariant");
5301 Exceptions::fthrow(
5302 THREAD_AND_LOCATION,
5303 vmSymbols::java_lang_ClassFormatError(),
5304 "Illegal method name \"%s\" in class %s", bytes,
5305 _class_name->as_C_string()
5306 );
5307 return;
5308 }
5309 }
5310
5311
5312 // Checks if signature is a legal field signature.
5313 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5314 const Symbol* signature,
5315 TRAPS) const {
5316 if (!_need_verify) { return; }
5317
5318 char buf[fixed_buffer_size];
5319 const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5320 const unsigned int length = signature->utf8_length();
5321 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5322
5323 if (p == NULL || (p - bytes) != (int)length) {
5324 throwIllegalSignature("Field", name, signature, CHECK);
5325 }
5326 }
5327
5328 // Checks if signature is a legal method signature.
5329 // Returns number of parameters
5330 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5331 const Symbol* signature,
5332 TRAPS) const {
5333 if (!_need_verify) {
5334 // make sure caller's args_size will be less than 0 even for non-static
5335 // method so it will be recomputed in compute_size_of_parameters().
5336 return -2;
5337 }
5338
5339 // Class initializers cannot have args for class format version >= 51.
5340 if (name == vmSymbols::class_initializer_name() &&
5341 signature != vmSymbols::void_method_signature() &&
5342 _major_version >= JAVA_7_VERSION) {
5343 throwIllegalSignature("Method", name, signature, CHECK_0);
5344 return 0;
5345 }
5346
5347 unsigned int args_size = 0;
5348 char buf[fixed_buffer_size];
5349 const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5350 unsigned int length = signature->utf8_length();
5351 const char* nextp;
5352
5353 // The first character must be a '('
5354 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5355 length--;
5356 // Skip over legal field signatures
5357 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5358 while ((length > 0) && (nextp != NULL)) {
5359 args_size++;
5360 if (p[0] == 'J' || p[0] == 'D') {
5361 args_size++;
5362 }
5363 length -= nextp - p;
5364 p = nextp;
5365 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5366 }
5367 // The first non-signature thing better be a ')'
5368 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5369 length--;
5370 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5371 // All internal methods must return void
5372 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5373 return args_size;
5374 }
5375 } else {
5376 // Now we better just have a return value
5377 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5378 if (nextp && ((int)length == (nextp - p))) {
5379 return args_size;
5380 }
5381 }
5382 }
5383 }
5384 // Report error
5385 throwIllegalSignature("Method", name, signature, CHECK_0);
5386 return 0;
5387 }
5388
5389 int ClassFileParser::static_field_size() const {
5390 assert(_field_info != NULL, "invariant");
5391 return _field_info->static_field_size;
5392 }
5393
5394 int ClassFileParser::total_oop_map_count() const {
5395 assert(_field_info != NULL, "invariant");
5396 return _field_info->total_oop_map_count;
5397 }
5398
5399 jint ClassFileParser::layout_size() const {
5400 assert(_field_info != NULL, "invariant");
5401 return _field_info->instance_size;
5402 }
5403
5404 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5405 const Array<Method*>* methods) {
5406 assert(ik != NULL, "invariant");
5407 assert(methods != NULL, "invariant");
5408
5409 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5410 // (We used to do this lazily, but now we query it in Rewriter,
5411 // which is eagerly done for every method, so we might as well do it now,
5412 // when everything is fresh in memory.)
5413 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5414
5415 if (klass_id != vmSymbols::NO_SID) {
5416 for (int j = 0; j < methods->length(); ++j) {
5417 Method* method = methods->at(j);
5418 method->init_intrinsic_id();
5419
5420 if (CheckIntrinsics) {
5421 // Check if an intrinsic is defined for method 'method',
5422 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5423 if (method->intrinsic_id() != vmIntrinsics::_none &&
5424 !method->intrinsic_candidate()) {
5425 tty->print("Compiler intrinsic is defined for method [%s], "
5426 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5427 method->name_and_sig_as_C_string(),
5428 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5429 );
5430 tty->cr();
5431 DEBUG_ONLY(vm_exit(1));
5432 }
5433 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5434 // but there is no intrinsic available for it.
5435 if (method->intrinsic_candidate() &&
5436 method->intrinsic_id() == vmIntrinsics::_none) {
5437 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5438 "but no compiler intrinsic is defined for the method.%s",
5439 method->name_and_sig_as_C_string(),
5440 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5441 );
5442 tty->cr();
5443 DEBUG_ONLY(vm_exit(1));
5444 }
5445 }
5446 } // end for
5447
5448 #ifdef ASSERT
5449 if (CheckIntrinsics) {
5450 // Check for orphan methods in the current class. A method m
5451 // of a class C is orphan if an intrinsic is defined for method m,
5452 // but class C does not declare m.
5453 // The check is potentially expensive, therefore it is available
5454 // only in debug builds.
5455
5456 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5457 if (vmIntrinsics::_compiledLambdaForm == id) {
5458 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5459 // generated for the JVM from a LambdaForm and therefore no method
5460 // is defined for it.
5461 continue;
5462 }
5463
5464 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5465 // Check if the current class contains a method with the same
5466 // name, flags, signature.
5467 bool match = false;
5468 for (int j = 0; j < methods->length(); ++j) {
5469 const Method* method = methods->at(j);
5470 if (method->intrinsic_id() == id) {
5471 match = true;
5472 break;
5473 }
5474 }
5475
5476 if (!match) {
5477 char buf[1000];
5478 tty->print("Compiler intrinsic is defined for method [%s], "
5479 "but the method is not available in class [%s].%s",
5480 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5481 buf, sizeof(buf)),
5482 ik->name()->as_C_string(),
5483 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5484 );
5485 tty->cr();
5486 DEBUG_ONLY(vm_exit(1));
5487 }
5488 }
5489 } // end for
5490 } // CheckIntrinsics
5491 #endif // ASSERT
5492 }
5493 }
5494
5495 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5496 if (_klass != NULL) {
5497 return _klass;
5498 }
5499
5500 InstanceKlass* const ik =
5501 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5502
5503 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5504
5505 assert(_klass == ik, "invariant");
5506
5507 ik->set_has_passed_fingerprint_check(false);
5508 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5509 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5510 if (aot_fp != 0 && aot_fp == _stream->compute_fingerprint()) {
5511 // This class matches with a class saved in an AOT library
5512 ik->set_has_passed_fingerprint_check(true);
5513 } else {
5514 ResourceMark rm;
5515 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5516 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5517 }
5518 }
5519
5520 return ik;
5521 }
5522
5523 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5524 assert(ik != NULL, "invariant");
5525
5526 // Set name and CLD before adding to CLD
5527 ik->set_class_loader_data(_loader_data);
5528 ik->set_name(_class_name);
5529
5530 // Add all classes to our internal class loader list here,
5531 // including classes in the bootstrap (NULL) class loader.
5532 const bool publicize = !is_internal();
5533
5534 _loader_data->add_class(ik, publicize);
5535
5536 set_klass_to_deallocate(ik);
5537
5538 assert(_field_info != NULL, "invariant");
5539 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5540 assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count,
5541 "sanity");
5542
5543 assert(ik->is_instance_klass(), "sanity");
5544 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5545
5546 // Fill in information already parsed
5547 ik->set_should_verify_class(_need_verify);
5548
5549 // Not yet: supers are done below to support the new subtype-checking fields
5550 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5551 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5552 assert(_fac != NULL, "invariant");
5553 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5554
5555 // this transfers ownership of a lot of arrays from
5556 // the parser onto the InstanceKlass*
5557 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5558
5559 // note that is not safe to use the fields in the parser from this point on
5560 assert(NULL == _cp, "invariant");
5561 assert(NULL == _fields, "invariant");
5562 assert(NULL == _methods, "invariant");
5563 assert(NULL == _inner_classes, "invariant");
5564 assert(NULL == _nest_members, "invariant");
5565 assert(NULL == _local_interfaces, "invariant");
5566 assert(NULL == _combined_annotations, "invariant");
5567
5568 if (_has_final_method) {
5569 ik->set_has_final_method();
5570 }
5571
5572 ik->copy_method_ordering(_method_ordering, CHECK);
5573 // The InstanceKlass::_methods_jmethod_ids cache
5574 // is managed on the assumption that the initial cache
5575 // size is equal to the number of methods in the class. If
5576 // that changes, then InstanceKlass::idnum_can_increment()
5577 // has to be changed accordingly.
5578 ik->set_initial_method_idnum(ik->methods()->length());
5579
5580 ik->set_this_class_index(_this_class_index);
5581
5582 if (is_anonymous()) {
5583 // _this_class_index is a CONSTANT_Class entry that refers to this
5584 // anonymous class itself. If this class needs to refer to its own methods or
5585 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5586 // _this_class_index. However, because this class is anonymous (it's
5587 // not stored in SystemDictionary), _this_class_index cannot be resolved
5588 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5589 // Therefore, we must eagerly resolve _this_class_index now.
5590 ik->constants()->klass_at_put(_this_class_index, ik);
5591 }
5592
5593 ik->set_minor_version(_minor_version);
5594 ik->set_major_version(_major_version);
5595 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5596 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5597
5598 if (_host_klass != NULL) {
5599 assert (ik->is_anonymous(), "should be the same");
5600 ik->set_host_klass(_host_klass);
5601 }
5602
5603 // Set PackageEntry for this_klass
5604 oop cl = ik->class_loader();
5605 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5606 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5607 ik->set_package(cld, CHECK);
5608
5609 const Array<Method*>* const methods = ik->methods();
5610 assert(methods != NULL, "invariant");
5611 const int methods_len = methods->length();
5612
5613 check_methods_for_intrinsics(ik, methods);
5614
5615 // Fill in field values obtained by parse_classfile_attributes
5616 if (_parsed_annotations->has_any_annotations()) {
5617 _parsed_annotations->apply_to(ik);
5618 }
5619
5620 apply_parsed_class_attributes(ik);
5621
5622 // Miranda methods
5623 if ((_num_miranda_methods > 0) ||
5624 // if this class introduced new miranda methods or
5625 (_super_klass != NULL && _super_klass->has_miranda_methods())
5626 // super class exists and this class inherited miranda methods
5627 ) {
5628 ik->set_has_miranda_methods(); // then set a flag
5629 }
5630
5631 // Fill in information needed to compute superclasses.
5632 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5633 ik->set_transitive_interfaces(_transitive_interfaces);
5634 _transitive_interfaces = NULL;
5635
5636 // Initialize itable offset tables
5637 klassItable::setup_itable_offset_table(ik);
5638
5639 // Compute transitive closure of interfaces this class implements
5640 // Do final class setup
5641 fill_oop_maps(ik,
5642 _field_info->nonstatic_oop_map_count,
5643 _field_info->nonstatic_oop_offsets,
5644 _field_info->nonstatic_oop_counts);
5645
5646 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5647 set_precomputed_flags(ik);
5648
5649 // check if this class can access its super class
5650 check_super_class_access(ik, CHECK);
5651
5652 // check if this class can access its superinterfaces
5653 check_super_interface_access(ik, CHECK);
5654
5655 // check if this class overrides any final method
5656 check_final_method_override(ik, CHECK);
5657
5658 // reject static interface methods prior to Java 8
5659 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5660 check_illegal_static_method(ik, CHECK);
5661 }
5662
5663 // Obtain this_klass' module entry
5664 ModuleEntry* module_entry = ik->module();
5665 assert(module_entry != NULL, "module_entry should always be set");
5666
5667 // Obtain java.lang.Module
5668 Handle module_handle(THREAD, module_entry->module());
5669
5670 // Allocate mirror and initialize static fields
5671 // The create_mirror() call will also call compute_modifiers()
5672 java_lang_Class::create_mirror(ik,
5673 Handle(THREAD, _loader_data->class_loader()),
5674 module_handle,
5675 _protection_domain,
5676 CHECK);
5677
5678 assert(_all_mirandas != NULL, "invariant");
5679
5680 // Generate any default methods - default methods are public interface methods
5681 // that have a default implementation. This is new with Java 8.
5682 if (_has_nonstatic_concrete_methods) {
5683 DefaultMethods::generate_default_methods(ik,
5684 _all_mirandas,
5685 CHECK);
5686 }
5687
5688 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5689 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5690 !module_entry->has_default_read_edges()) {
5691 if (!module_entry->set_has_default_read_edges()) {
5692 // We won a potential race
5693 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5694 }
5695 }
5696
5697 // Update the loader_data graph.
5698 record_defined_class_dependencies(ik, CHECK);
5699
5700 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5701
5702 if (!is_internal()) {
5703 if (log_is_enabled(Info, class, load)) {
5704 ResourceMark rm;
5705 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5706 ik->print_class_load_logging(_loader_data, module_name, _stream);
5707 }
5708
5709 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5710 ik->major_version() != JAVA_MIN_SUPPORTED_VERSION &&
5711 log_is_enabled(Info, class, preview)) {
5712 ResourceMark rm;
5713 log_info(class, preview)("Loading preview feature type %s", ik->external_name());
5714 }
5715
5716 if (log_is_enabled(Debug, class, resolve)) {
5717 ResourceMark rm;
5718 // print out the superclass.
5719 const char * from = ik->external_name();
5720 if (ik->java_super() != NULL) {
5721 log_debug(class, resolve)("%s %s (super)",
5722 from,
5723 ik->java_super()->external_name());
5724 }
5725 // print out each of the interface classes referred to by this class.
5726 const Array<Klass*>* const local_interfaces = ik->local_interfaces();
5727 if (local_interfaces != NULL) {
5728 const int length = local_interfaces->length();
5729 for (int i = 0; i < length; i++) {
5730 const Klass* const k = local_interfaces->at(i);
5731 const char * to = k->external_name();
5732 log_debug(class, resolve)("%s %s (interface)", from, to);
5733 }
5734 }
5735 }
5736 }
5737
5738 JFR_ONLY(INIT_ID(ik);)
5739
5740 // If we reach here, all is well.
5741 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5742 // in order for it to not be destroyed in the ClassFileParser destructor.
5743 set_klass_to_deallocate(NULL);
5744
5745 // it's official
5746 set_klass(ik);
5747
5748 debug_only(ik->verify();)
5749 }
5750
5751 // For an anonymous class that is in the unnamed package, move it to its host class's
5752 // package by prepending its host class's package name to its class name and setting
5753 // its _class_name field.
5754 void ClassFileParser::prepend_host_package_name(const InstanceKlass* host_klass, TRAPS) {
5755 ResourceMark rm(THREAD);
5756 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
5757 "Anonymous class should not be in a package");
5758 const char* host_pkg_name =
5759 ClassLoader::package_from_name(host_klass->name()->as_C_string(), NULL);
5760
5761 if (host_pkg_name != NULL) {
5762 size_t host_pkg_len = strlen(host_pkg_name);
5763 int class_name_len = _class_name->utf8_length();
5764 char* new_anon_name =
5765 NEW_RESOURCE_ARRAY(char, host_pkg_len + 1 + class_name_len);
5766 // Copy host package name and trailing /.
5767 strncpy(new_anon_name, host_pkg_name, host_pkg_len);
5768 new_anon_name[host_pkg_len] = '/';
5769 // Append anonymous class name. The anonymous class name can contain odd
5770 // characters. So, do a strncpy instead of using sprintf("%s...").
5771 strncpy(new_anon_name + host_pkg_len + 1, (char *)_class_name->base(), class_name_len);
5772
5773 // Create a symbol and update the anonymous class name.
5774 _class_name = SymbolTable::new_symbol(new_anon_name,
5775 (int)host_pkg_len + 1 + class_name_len,
5776 CHECK);
5777 }
5778 }
5779
5780 // If the host class and the anonymous class are in the same package then do
5781 // nothing. If the anonymous class is in the unnamed package then move it to its
5782 // host's package. If the classes are in different packages then throw an IAE
5783 // exception.
5784 void ClassFileParser::fix_anonymous_class_name(TRAPS) {
5785 assert(_host_klass != NULL, "Expected an anonymous class");
5786
5787 const jbyte* anon_last_slash = UTF8::strrchr(_class_name->base(),
5788 _class_name->utf8_length(), '/');
5789 if (anon_last_slash == NULL) { // Unnamed package
5790 prepend_host_package_name(_host_klass, CHECK);
5791 } else {
5792 if (!_host_klass->is_same_class_package(_host_klass->class_loader(), _class_name)) {
5793 ResourceMark rm(THREAD);
5794 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
5795 err_msg("Host class %s and anonymous class %s are in different packages",
5796 _host_klass->name()->as_C_string(), _class_name->as_C_string()));
5797 }
5798 }
5799 }
5800
5801 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5802 bool trusted = (loader_data->is_the_null_class_loader_data() ||
5803 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
5804 bool need_verify =
5805 // verifyAll
5806 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5807 // verifyRemote
5808 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5809 return !need_verify;
5810 }
5811
5812 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5813 Symbol* name,
5814 ClassLoaderData* loader_data,
5815 Handle protection_domain,
5816 const InstanceKlass* host_klass,
5817 GrowableArray<Handle>* cp_patches,
5818 Publicity pub_level,
5819 TRAPS) :
5820 _stream(stream),
5821 _requested_name(name),
5822 _loader_data(loader_data),
5823 _host_klass(host_klass),
5824 _cp_patches(cp_patches),
5825 _num_patched_klasses(0),
5826 _max_num_patched_klasses(0),
5827 _orig_cp_size(0),
5828 _first_patched_klass_resolved_index(0),
5829 _super_klass(),
5830 _cp(NULL),
5831 _fields(NULL),
5832 _methods(NULL),
5833 _inner_classes(NULL),
5834 _nest_members(NULL),
5835 _nest_host(0),
5836 _local_interfaces(NULL),
5837 _transitive_interfaces(NULL),
5838 _combined_annotations(NULL),
5839 _annotations(NULL),
5840 _type_annotations(NULL),
5841 _fields_annotations(NULL),
5842 _fields_type_annotations(NULL),
5843 _klass(NULL),
5844 _klass_to_deallocate(NULL),
5845 _parsed_annotations(NULL),
5846 _fac(NULL),
5847 _field_info(NULL),
5848 _method_ordering(NULL),
5849 _all_mirandas(NULL),
5850 _vtable_size(0),
5851 _itable_size(0),
5852 _num_miranda_methods(0),
5853 _rt(REF_NONE),
5854 _protection_domain(protection_domain),
5855 _access_flags(),
5856 _pub_level(pub_level),
5857 _bad_constant_seen(0),
5858 _synthetic_flag(false),
5859 _sde_length(false),
5860 _sde_buffer(NULL),
5861 _sourcefile_index(0),
5862 _generic_signature_index(0),
5863 _major_version(0),
5864 _minor_version(0),
5865 _this_class_index(0),
5866 _super_class_index(0),
5867 _itfs_len(0),
5868 _java_fields_count(0),
5869 _need_verify(false),
5870 _relax_verify(false),
5871 _has_nonstatic_concrete_methods(false),
5872 _declares_nonstatic_concrete_methods(false),
5873 _has_final_method(false),
5874 _has_finalizer(false),
5875 _has_empty_finalizer(false),
5876 _has_vanilla_constructor(false),
5877 _max_bootstrap_specifier_index(-1) {
5878
5879 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
5880
5881 assert(THREAD->is_Java_thread(), "invariant");
5882 assert(_loader_data != NULL, "invariant");
5883 assert(stream != NULL, "invariant");
5884 assert(_stream != NULL, "invariant");
5885 assert(_stream->buffer() == _stream->current(), "invariant");
5886 assert(_class_name != NULL, "invariant");
5887 assert(0 == _access_flags.as_int(), "invariant");
5888
5889 // Figure out whether we can skip format checking (matching classic VM behavior)
5890 if (DumpSharedSpaces) {
5891 // verify == true means it's a 'remote' class (i.e., non-boot class)
5892 // Verification decision is based on BytecodeVerificationRemote flag
5893 // for those classes.
5894 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
5895 BytecodeVerificationLocal;
5896 }
5897 else {
5898 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
5899 stream->need_verify());
5900 }
5901 if (_cp_patches != NULL) {
5902 int len = _cp_patches->length();
5903 for (int i=0; i<len; i++) {
5904 if (has_cp_patch_at(i)) {
5905 Handle patch = cp_patch_at(i);
5906 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
5907 // We need to append the names of the patched classes to the end of the constant pool,
5908 // because a patched class may have a Utf8 name that's not already included in the
5909 // original constant pool. These class names are used when patch_constant_pool()
5910 // calls patch_class().
5911 //
5912 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
5913 // At this point, we don't know the tag for index i yet, because we haven't parsed the
5914 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
5915 _max_num_patched_klasses++;
5916 }
5917 }
5918 }
5919 }
5920
5921 // synch back verification state to stream
5922 stream->set_verify(_need_verify);
5923
5924 // Check if verification needs to be relaxed for this class file
5925 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
5926 _relax_verify = relax_format_check_for(_loader_data);
5927
5928 parse_stream(stream, CHECK);
5929
5930 post_process_parsed_stream(stream, _cp, CHECK);
5931 }
5932
5933 void ClassFileParser::clear_class_metadata() {
5934 // metadata created before the instance klass is created. Must be
5935 // deallocated if classfile parsing returns an error.
5936 _cp = NULL;
5937 _fields = NULL;
5938 _methods = NULL;
5939 _inner_classes = NULL;
5940 _nest_members = NULL;
5941 _local_interfaces = NULL;
5942 _combined_annotations = NULL;
5943 _annotations = _type_annotations = NULL;
5944 _fields_annotations = _fields_type_annotations = NULL;
5945 }
5946
5947 // Destructor to clean up
5948 ClassFileParser::~ClassFileParser() {
5949 if (_cp != NULL) {
5950 MetadataFactory::free_metadata(_loader_data, _cp);
5951 }
5952 if (_fields != NULL) {
5953 MetadataFactory::free_array<u2>(_loader_data, _fields);
5954 }
5955
5956 if (_methods != NULL) {
5957 // Free methods
5958 InstanceKlass::deallocate_methods(_loader_data, _methods);
5959 }
5960
5961 // beware of the Universe::empty_blah_array!!
5962 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
5963 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5964 }
5965
5966 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
5967 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5968 }
5969
5970 // Free interfaces
5971 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5972 _local_interfaces, _transitive_interfaces);
5973
5974 if (_combined_annotations != NULL) {
5975 // After all annotations arrays have been created, they are installed into the
5976 // Annotations object that will be assigned to the InstanceKlass being created.
5977
5978 // Deallocate the Annotations object and the installed annotations arrays.
5979 _combined_annotations->deallocate_contents(_loader_data);
5980
5981 // If the _combined_annotations pointer is non-NULL,
5982 // then the other annotations fields should have been cleared.
5983 assert(_annotations == NULL, "Should have been cleared");
5984 assert(_type_annotations == NULL, "Should have been cleared");
5985 assert(_fields_annotations == NULL, "Should have been cleared");
5986 assert(_fields_type_annotations == NULL, "Should have been cleared");
5987 } else {
5988 // If the annotations arrays were not installed into the Annotations object,
5989 // then they have to be deallocated explicitly.
5990 MetadataFactory::free_array<u1>(_loader_data, _annotations);
5991 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
5992 Annotations::free_contents(_loader_data, _fields_annotations);
5993 Annotations::free_contents(_loader_data, _fields_type_annotations);
5994 }
5995
5996 clear_class_metadata();
5997 _transitive_interfaces = NULL;
5998
5999 // deallocate the klass if already created. Don't directly deallocate, but add
6000 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6001 // at a safepoint.
6002 if (_klass_to_deallocate != NULL) {
6003 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6004 }
6005 }
6006
6007 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6008 TRAPS) {
6009
6010 assert(stream != NULL, "invariant");
6011 assert(_class_name != NULL, "invariant");
6012
6013 // BEGIN STREAM PARSING
6014 stream->guarantee_more(8, CHECK); // magic, major, minor
6015 // Magic value
6016 const u4 magic = stream->get_u4_fast();
6017 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6018 "Incompatible magic value %u in class file %s",
6019 magic, CHECK);
6020
6021 // Version numbers
6022 _minor_version = stream->get_u2_fast();
6023 _major_version = stream->get_u2_fast();
6024
6025 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) {
6026 ResourceMark rm;
6027 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
6028 _major_version, _minor_version, _class_name->as_C_string());
6029 Exceptions::fthrow(
6030 THREAD_AND_LOCATION,
6031 vmSymbols::java_lang_UnsupportedClassVersionError(),
6032 "Unsupported major.minor version for dump time %u.%u",
6033 _major_version,
6034 _minor_version);
6035 }
6036
6037 // Check version numbers - we check this even with verifier off
6038 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6039
6040 stream->guarantee_more(3, CHECK); // length, first cp tag
6041 u2 cp_size = stream->get_u2_fast();
6042
6043 guarantee_property(
6044 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6045 cp_size, CHECK);
6046
6047 _orig_cp_size = cp_size;
6048 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6049 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6050 }
6051 cp_size += _max_num_patched_klasses;
6052
6053 _cp = ConstantPool::allocate(_loader_data,
6054 cp_size,
6055 CHECK);
6056
6057 ConstantPool* const cp = _cp;
6058
6059 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6060
6061 assert(cp_size == (const u2)cp->length(), "invariant");
6062
6063 // ACCESS FLAGS
6064 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6065
6066 // Access flags
6067 jint flags;
6068 // JVM_ACC_MODULE is defined in JDK-9 and later.
6069 if (_major_version >= JAVA_9_VERSION) {
6070 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
6071 } else {
6072 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
6073 }
6074
6075 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6076 // Set abstract bit for old class files for backward compatibility
6077 flags |= JVM_ACC_ABSTRACT;
6078 }
6079
6080 verify_legal_class_modifiers(flags, CHECK);
6081
6082 short bad_constant = class_bad_constant_seen();
6083 if (bad_constant != 0) {
6084 // Do not throw CFE until after the access_flags are checked because if
6085 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6086 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6087 }
6088
6089 _access_flags.set_flags(flags);
6090
6091 // This class and superclass
6092 _this_class_index = stream->get_u2_fast();
6093 check_property(
6094 valid_cp_range(_this_class_index, cp_size) &&
6095 cp->tag_at(_this_class_index).is_unresolved_klass(),
6096 "Invalid this class index %u in constant pool in class file %s",
6097 _this_class_index, CHECK);
6098
6099 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6100 assert(class_name_in_cp != NULL, "class_name can't be null");
6101
6102 // Update _class_name which could be null previously
6103 // to reflect the name in the constant pool
6104 _class_name = class_name_in_cp;
6105
6106 // Don't need to check whether this class name is legal or not.
6107 // It has been checked when constant pool is parsed.
6108 // However, make sure it is not an array type.
6109 if (_need_verify) {
6110 guarantee_property(_class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
6111 "Bad class name in class file %s",
6112 CHECK);
6113 }
6114
6115 // Checks if name in class file matches requested name
6116 if (_requested_name != NULL && _requested_name != _class_name) {
6117 ResourceMark rm(THREAD);
6118 Exceptions::fthrow(
6119 THREAD_AND_LOCATION,
6120 vmSymbols::java_lang_NoClassDefFoundError(),
6121 "%s (wrong name: %s)",
6122 _class_name->as_C_string(),
6123 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6124 );
6125 return;
6126 }
6127
6128 // if this is an anonymous class fix up its name if it's in the unnamed
6129 // package. Otherwise, throw IAE if it is in a different package than
6130 // its host class.
6131 if (_host_klass != NULL) {
6132 fix_anonymous_class_name(CHECK);
6133 }
6134
6135 // Verification prevents us from creating names with dots in them, this
6136 // asserts that that's the case.
6137 assert(is_internal_format(_class_name), "external class name format used internally");
6138
6139 if (!is_internal()) {
6140 LogTarget(Debug, class, preorder) lt;
6141 if (lt.is_enabled()){
6142 ResourceMark rm(THREAD);
6143 LogStream ls(lt);
6144 ls.print("%s", _class_name->as_klass_external_name());
6145 if (stream->source() != NULL) {
6146 ls.print(" source: %s", stream->source());
6147 }
6148 ls.cr();
6149 }
6150
6151 #if INCLUDE_CDS
6152 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6153 if (!ClassLoader::has_jrt_entry()) {
6154 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6155 DumpLoadedClassList = NULL;
6156 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6157 _host_klass == NULL) {
6158 // Only dump the classes that can be stored into CDS archive.
6159 // Anonymous classes such as generated LambdaForm classes are also not included.
6160 oop class_loader = _loader_data->class_loader();
6161 ResourceMark rm(THREAD);
6162 bool skip = false;
6163 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6164 // For the boot and platform class loaders, skip classes that are not found in the
6165 // java runtime image, such as those found in the --patch-module entries.
6166 // These classes can't be loaded from the archive during runtime.
6167 if (!ClassLoader::is_modules_image(stream->source()) && strncmp(stream->source(), "jrt:", 4) != 0) {
6168 skip = true;
6169 }
6170
6171 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6172 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6173 // as they can be loaded from the archive during runtime.
6174 skip = false;
6175 }
6176 }
6177 if (skip) {
6178 tty->print_cr("skip writing class %s from source %s to classlist file",
6179 _class_name->as_C_string(), stream->source());
6180 } else {
6181 classlist_file->print_cr("%s", _class_name->as_C_string());
6182 classlist_file->flush();
6183 }
6184 }
6185 }
6186 #endif
6187 }
6188
6189 // SUPERKLASS
6190 _super_class_index = stream->get_u2_fast();
6191 _super_klass = parse_super_class(cp,
6192 _super_class_index,
6193 _need_verify,
6194 CHECK);
6195
6196 // Interfaces
6197 _itfs_len = stream->get_u2_fast();
6198 parse_interfaces(stream,
6199 _itfs_len,
6200 cp,
6201 &_has_nonstatic_concrete_methods,
6202 CHECK);
6203
6204 assert(_local_interfaces != NULL, "invariant");
6205
6206 // Fields (offsets are filled in later)
6207 _fac = new FieldAllocationCount();
6208 parse_fields(stream,
6209 _access_flags.is_interface(),
6210 _fac,
6211 cp,
6212 cp_size,
6213 &_java_fields_count,
6214 CHECK);
6215
6216 assert(_fields != NULL, "invariant");
6217
6218 // Methods
6219 AccessFlags promoted_flags;
6220 parse_methods(stream,
6221 _access_flags.is_interface(),
6222 &promoted_flags,
6223 &_has_final_method,
6224 &_declares_nonstatic_concrete_methods,
6225 CHECK);
6226
6227 assert(_methods != NULL, "invariant");
6228
6229 // promote flags from parse_methods() to the klass' flags
6230 _access_flags.add_promoted_flags(promoted_flags.as_int());
6231
6232 if (_declares_nonstatic_concrete_methods) {
6233 _has_nonstatic_concrete_methods = true;
6234 }
6235
6236 // Additional attributes/annotations
6237 _parsed_annotations = new ClassAnnotationCollector();
6238 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6239
6240 assert(_inner_classes != NULL, "invariant");
6241
6242 // Finalize the Annotations metadata object,
6243 // now that all annotation arrays have been created.
6244 create_combined_annotations(CHECK);
6245
6246 // Make sure this is the end of class file stream
6247 guarantee_property(stream->at_eos(),
6248 "Extra bytes at the end of class file %s",
6249 CHECK);
6250
6251 // all bytes in stream read and parsed
6252 }
6253
6254 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6255 ConstantPool* cp,
6256 TRAPS) {
6257 assert(stream != NULL, "invariant");
6258 assert(stream->at_eos(), "invariant");
6259 assert(cp != NULL, "invariant");
6260 assert(_loader_data != NULL, "invariant");
6261
6262 if (_class_name == vmSymbols::java_lang_Object()) {
6263 check_property(_local_interfaces == Universe::the_empty_klass_array(),
6264 "java.lang.Object cannot implement an interface in class file %s",
6265 CHECK);
6266 }
6267 // We check super class after class file is parsed and format is checked
6268 if (_super_class_index > 0 && NULL ==_super_klass) {
6269 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6270 if (_access_flags.is_interface()) {
6271 // Before attempting to resolve the superclass, check for class format
6272 // errors not checked yet.
6273 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6274 "Interfaces must have java.lang.Object as superclass in class file %s",
6275 CHECK);
6276 }
6277 Handle loader(THREAD, _loader_data->class_loader());
6278 _super_klass = (const InstanceKlass*)
6279 SystemDictionary::resolve_super_or_fail(_class_name,
6280 super_class_name,
6281 loader,
6282 _protection_domain,
6283 true,
6284 CHECK);
6285 }
6286
6287 if (_super_klass != NULL) {
6288 if (_super_klass->has_nonstatic_concrete_methods()) {
6289 _has_nonstatic_concrete_methods = true;
6290 }
6291
6292 if (_super_klass->is_interface()) {
6293 ResourceMark rm(THREAD);
6294 Exceptions::fthrow(
6295 THREAD_AND_LOCATION,
6296 vmSymbols::java_lang_IncompatibleClassChangeError(),
6297 "class %s has interface %s as super class",
6298 _class_name->as_klass_external_name(),
6299 _super_klass->external_name()
6300 );
6301 return;
6302 }
6303 // Make sure super class is not final
6304 if (_super_klass->is_final()) {
6305 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6306 }
6307 }
6308
6309 // Compute the transitive list of all unique interfaces implemented by this class
6310 _transitive_interfaces =
6311 compute_transitive_interfaces(_super_klass,
6312 _local_interfaces,
6313 _loader_data,
6314 CHECK);
6315
6316 assert(_transitive_interfaces != NULL, "invariant");
6317
6318 // sort methods
6319 _method_ordering = sort_methods(_methods);
6320
6321 _all_mirandas = new GrowableArray<Method*>(20);
6322
6323 Handle loader(THREAD, _loader_data->class_loader());
6324 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6325 &_num_miranda_methods,
6326 _all_mirandas,
6327 _super_klass,
6328 _methods,
6329 _access_flags,
6330 _major_version,
6331 loader,
6332 _class_name,
6333 _local_interfaces,
6334 CHECK);
6335
6336 // Size of Java itable (in words)
6337 _itable_size = _access_flags.is_interface() ? 0 :
6338 klassItable::compute_itable_size(_transitive_interfaces);
6339
6340 assert(_fac != NULL, "invariant");
6341 assert(_parsed_annotations != NULL, "invariant");
6342
6343 _field_info = new FieldLayoutInfo();
6344 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6345
6346 // Compute reference typ
6347 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6348
6349 }
6350
6351 void ClassFileParser::set_klass(InstanceKlass* klass) {
6352
6353 #ifdef ASSERT
6354 if (klass != NULL) {
6355 assert(NULL == _klass, "leaking?");
6356 }
6357 #endif
6358
6359 _klass = klass;
6360 }
6361
6362 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6363
6364 #ifdef ASSERT
6365 if (klass != NULL) {
6366 assert(NULL == _klass_to_deallocate, "leaking?");
6367 }
6368 #endif
6369
6370 _klass_to_deallocate = klass;
6371 }
6372
6373 // Caller responsible for ResourceMark
6374 // clone stream with rewound position
6375 const ClassFileStream* ClassFileParser::clone_stream() const {
6376 assert(_stream != NULL, "invariant");
6377
6378 return _stream->clone();
6379 }
6380 // ----------------------------------------------------------------------------
6381 // debugging
6382
6383 #ifdef ASSERT
6384
6385 // return true if class_name contains no '.' (internal format is '/')
6386 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6387 if (class_name != NULL) {
6388 ResourceMark rm;
6389 char* name = class_name->as_C_string();
6390 return strchr(name, '.') == NULL;
6391 } else {
6392 return true;
6393 }
6394 }
6395
6396 #endif