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 "oops/valueKlass.hpp"
59 #include "prims/jvmtiExport.hpp"
60 #include "prims/jvmtiThreadState.hpp"
61 #include "runtime/arguments.hpp"
62 #include "runtime/handles.inline.hpp"
63 #include "runtime/javaCalls.hpp"
64 #include "runtime/perfData.hpp"
65 #include "runtime/reflection.hpp"
66 #include "runtime/safepointVerifiers.hpp"
67 #include "runtime/signature.hpp"
68 #include "runtime/timer.hpp"
69 #include "services/classLoadingService.hpp"
70 #include "services/threadService.hpp"
71 #include "utilities/align.hpp"
72 #include "utilities/bitMap.inline.hpp"
73 #include "utilities/copy.hpp"
74 #include "utilities/exceptions.hpp"
75 #include "utilities/globalDefinitions.hpp"
76 #include "utilities/growableArray.hpp"
77 #include "utilities/macros.hpp"
78 #include "utilities/ostream.hpp"
79 #include "utilities/resourceHash.hpp"
80 #if INCLUDE_CDS
81 #include "classfile/systemDictionaryShared.hpp"
82 #endif
83 #if INCLUDE_JFR
84 #include "jfr/support/jfrTraceIdExtension.hpp"
85 #endif
86
87 // We generally try to create the oops directly when parsing, rather than
88 // allocating temporary data structures and copying the bytes twice. A
89 // temporary area is only needed when parsing utf8 entries in the constant
90 // pool and when parsing line number tables.
91
92 // We add assert in debug mode when class format is not checked.
93
94 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
95 #define JAVA_MIN_SUPPORTED_VERSION 45
96 #define JAVA_PREVIEW_MINOR_VERSION 65535
97
98 // Used for two backward compatibility reasons:
99 // - to check for new additions to the class file format in JDK1.5
100 // - to check for bug fixes in the format checker in JDK1.5
101 #define JAVA_1_5_VERSION 49
102
103 // Used for backward compatibility reasons:
104 // - to check for javac bug fixes that happened after 1.5
105 // - also used as the max version when running in jdk6
106 #define JAVA_6_VERSION 50
107
108 // Used for backward compatibility reasons:
109 // - to disallow argument and require ACC_STATIC for <clinit> methods
110 #define JAVA_7_VERSION 51
111
112 // Extension method support.
113 #define JAVA_8_VERSION 52
114
115 #define JAVA_9_VERSION 53
116
117 #define JAVA_10_VERSION 54
118
119 #define JAVA_11_VERSION 55
120
121 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
122 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION,
123 "Unexpected bad constant pool entry");
124 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
125 }
126
127 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
128 ConstantPool* cp,
129 const int length,
130 TRAPS) {
131 assert(stream != NULL, "invariant");
132 assert(cp != NULL, "invariant");
133
134 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
135 // this function (_current can be allocated in a register, with scalar
136 // replacement of aggregates). The _current pointer is copied back to
137 // stream() when this function returns. DON'T call another method within
138 // this method that uses stream().
139 const ClassFileStream cfs1 = *stream;
140 const ClassFileStream* const cfs = &cfs1;
141
142 assert(cfs->allocated_on_stack(), "should be local");
143 debug_only(const u1* const old_current = stream->current();)
144
145 // Used for batching symbol allocations.
146 const char* names[SymbolTable::symbol_alloc_batch_size];
147 int lengths[SymbolTable::symbol_alloc_batch_size];
148 int indices[SymbolTable::symbol_alloc_batch_size];
149 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
150 int names_count = 0;
151
152 // parsing Index 0 is unused
153 for (int index = 1; index < length; index++) {
154 // Each of the following case guarantees one more byte in the stream
155 // for the following tag or the access_flags following constant pool,
156 // so we don't need bounds-check for reading tag.
157 const u1 tag = cfs->get_u1_fast();
158 switch (tag) {
159 case JVM_CONSTANT_Class: {
160 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
161 const u2 name_index = cfs->get_u2_fast();
162 cp->klass_index_at_put(index, name_index);
163 break;
164 }
165 case JVM_CONSTANT_Fieldref: {
166 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
167 const u2 class_index = cfs->get_u2_fast();
168 const u2 name_and_type_index = cfs->get_u2_fast();
169 cp->field_at_put(index, class_index, name_and_type_index);
170 break;
171 }
172 case JVM_CONSTANT_Methodref: {
173 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
174 const u2 class_index = cfs->get_u2_fast();
175 const u2 name_and_type_index = cfs->get_u2_fast();
176 cp->method_at_put(index, class_index, name_and_type_index);
177 break;
178 }
179 case JVM_CONSTANT_InterfaceMethodref: {
180 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
181 const u2 class_index = cfs->get_u2_fast();
182 const u2 name_and_type_index = cfs->get_u2_fast();
183 cp->interface_method_at_put(index, class_index, name_and_type_index);
184 break;
185 }
186 case JVM_CONSTANT_String : {
187 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
188 const u2 string_index = cfs->get_u2_fast();
189 cp->string_index_at_put(index, string_index);
190 break;
191 }
192 case JVM_CONSTANT_MethodHandle :
193 case JVM_CONSTANT_MethodType: {
194 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
195 classfile_parse_error(
196 "Class file version does not support constant tag %u in class file %s",
197 tag, CHECK);
198 }
199 if (tag == JVM_CONSTANT_MethodHandle) {
200 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
201 const u1 ref_kind = cfs->get_u1_fast();
202 const u2 method_index = cfs->get_u2_fast();
203 cp->method_handle_index_at_put(index, ref_kind, method_index);
204 }
205 else if (tag == JVM_CONSTANT_MethodType) {
206 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
207 const u2 signature_index = cfs->get_u2_fast();
208 cp->method_type_index_at_put(index, signature_index);
209 }
210 else {
211 ShouldNotReachHere();
212 }
213 break;
214 }
215 case JVM_CONSTANT_Dynamic : {
216 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
217 classfile_parse_error(
218 "Class file version does not support constant tag %u in class file %s",
219 tag, CHECK);
220 }
221 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
222 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
223 const u2 name_and_type_index = cfs->get_u2_fast();
224 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
225 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
226 }
227 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
228 break;
229 }
230 case JVM_CONSTANT_InvokeDynamic : {
231 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
232 classfile_parse_error(
233 "Class file version does not support constant tag %u in class file %s",
234 tag, CHECK);
235 }
236 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
237 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
238 const u2 name_and_type_index = cfs->get_u2_fast();
239 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
240 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
241 }
242 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
243 break;
244 }
245 case JVM_CONSTANT_Integer: {
246 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
247 const u4 bytes = cfs->get_u4_fast();
248 cp->int_at_put(index, (jint)bytes);
249 break;
250 }
251 case JVM_CONSTANT_Float: {
252 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
253 const u4 bytes = cfs->get_u4_fast();
254 cp->float_at_put(index, *(jfloat*)&bytes);
255 break;
256 }
257 case JVM_CONSTANT_Long: {
258 // A mangled type might cause you to overrun allocated memory
259 guarantee_property(index + 1 < length,
260 "Invalid constant pool entry %u in class file %s",
261 index,
262 CHECK);
263 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
264 const u8 bytes = cfs->get_u8_fast();
265 cp->long_at_put(index, bytes);
266 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
267 break;
268 }
269 case JVM_CONSTANT_Double: {
270 // A mangled type might cause you to overrun allocated memory
271 guarantee_property(index+1 < length,
272 "Invalid constant pool entry %u in class file %s",
273 index,
274 CHECK);
275 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
276 const u8 bytes = cfs->get_u8_fast();
277 cp->double_at_put(index, *(jdouble*)&bytes);
278 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
279 break;
280 }
281 case JVM_CONSTANT_NameAndType: {
282 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
283 const u2 name_index = cfs->get_u2_fast();
284 const u2 signature_index = cfs->get_u2_fast();
285 cp->name_and_type_at_put(index, name_index, signature_index);
286 break;
287 }
288 case JVM_CONSTANT_Utf8 : {
289 cfs->guarantee_more(2, CHECK); // utf8_length
290 u2 utf8_length = cfs->get_u2_fast();
291 const u1* utf8_buffer = cfs->current();
292 assert(utf8_buffer != NULL, "null utf8 buffer");
293 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
294 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
295 cfs->skip_u1_fast(utf8_length);
296
297 // Before storing the symbol, make sure it's legal
298 if (_need_verify) {
299 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
300 }
301
302 if (has_cp_patch_at(index)) {
303 Handle patch = clear_cp_patch_at(index);
304 guarantee_property(java_lang_String::is_instance(patch()),
305 "Illegal utf8 patch at %d in class file %s",
306 index,
307 CHECK);
308 const char* const str = java_lang_String::as_utf8_string(patch());
309 // (could use java_lang_String::as_symbol instead, but might as well batch them)
310 utf8_buffer = (const u1*) str;
311 utf8_length = (int) strlen(str);
312 }
313
314 unsigned int hash;
315 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
316 utf8_length,
317 hash);
318 if (result == NULL) {
319 names[names_count] = (const char*)utf8_buffer;
320 lengths[names_count] = utf8_length;
321 indices[names_count] = index;
322 hashValues[names_count++] = hash;
323 if (names_count == SymbolTable::symbol_alloc_batch_size) {
324 SymbolTable::new_symbols(_loader_data,
325 cp,
326 names_count,
327 names,
328 lengths,
329 indices,
330 hashValues,
331 CHECK);
332 names_count = 0;
333 }
334 } else {
335 cp->symbol_at_put(index, result);
336 }
337 break;
338 }
339 case 19:
340 case 20: {
341 // Record that an error occurred in these two cases but keep parsing so
342 // that ACC_Module can be checked for in the access_flags. Need to
343 // throw NoClassDefFoundError in that case.
344 if (_major_version >= JAVA_9_VERSION) {
345 cfs->guarantee_more(3, CHECK);
346 cfs->get_u2_fast();
347 set_class_bad_constant_seen(tag);
348 break;
349 }
350 }
351 default: {
352 classfile_parse_error("Unknown constant tag %u in class file %s",
353 tag,
354 CHECK);
355 break;
356 }
357 } // end of switch(tag)
358 } // end of for
359
360 // Allocate the remaining symbols
361 if (names_count > 0) {
362 SymbolTable::new_symbols(_loader_data,
363 cp,
364 names_count,
365 names,
366 lengths,
367 indices,
368 hashValues,
369 CHECK);
370 }
371
372 // Copy _current pointer of local copy back to stream.
373 assert(stream->current() == old_current, "non-exclusive use of stream");
374 stream->set_current(cfs1.current());
375
376 }
377
378 static inline bool valid_cp_range(int index, int length) {
379 return (index > 0 && index < length);
380 }
381
382 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
383 assert(cp != NULL, "invariant");
384 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
385 return cp->symbol_at(index);
386 }
387 return NULL;
388 }
389
390 #ifdef ASSERT
391 PRAGMA_DIAG_PUSH
392 PRAGMA_FORMAT_NONLITERAL_IGNORED
393 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
394 ResourceMark rm(THREAD);
395 fatal(msg, _class_name->as_C_string());
396 }
397
398 void ClassFileParser::report_assert_property_failure(const char* msg,
399 int index,
400 TRAPS) const {
401 ResourceMark rm(THREAD);
402 fatal(msg, index, _class_name->as_C_string());
403 }
404 PRAGMA_DIAG_POP
405 #endif
406
407 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
408 ConstantPool* const cp,
409 const int length,
410 TRAPS) {
411 assert(cp != NULL, "invariant");
412 assert(stream != NULL, "invariant");
413
414 // parsing constant pool entries
415 parse_constant_pool_entries(stream, cp, length, CHECK);
416 if (class_bad_constant_seen() != 0) {
417 // a bad CP entry has been detected previously so stop parsing and just return.
418 return;
419 }
420
421 int index = 1; // declared outside of loops for portability
422 int num_klasses = 0;
423
424 // first verification pass - validate cross references
425 // and fixup class and string constants
426 for (index = 1; index < length; index++) { // Index 0 is unused
427 const jbyte tag = cp->tag_at(index).value();
428 switch (tag) {
429 case JVM_CONSTANT_Class: {
430 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
431 break;
432 }
433 case JVM_CONSTANT_Fieldref:
434 // fall through
435 case JVM_CONSTANT_Methodref:
436 // fall through
437 case JVM_CONSTANT_InterfaceMethodref: {
438 if (!_need_verify) break;
439 const int klass_ref_index = cp->klass_ref_index_at(index);
440 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
441 check_property(valid_klass_reference_at(klass_ref_index),
442 "Invalid constant pool index %u in class file %s",
443 klass_ref_index, CHECK);
444 check_property(valid_cp_range(name_and_type_ref_index, length) &&
445 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
446 "Invalid constant pool index %u in class file %s",
447 name_and_type_ref_index, CHECK);
448 break;
449 }
450 case JVM_CONSTANT_String: {
451 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
452 break;
453 }
454 case JVM_CONSTANT_Integer:
455 break;
456 case JVM_CONSTANT_Float:
457 break;
458 case JVM_CONSTANT_Long:
459 case JVM_CONSTANT_Double: {
460 index++;
461 check_property(
462 (index < length && cp->tag_at(index).is_invalid()),
463 "Improper constant pool long/double index %u in class file %s",
464 index, CHECK);
465 break;
466 }
467 case JVM_CONSTANT_NameAndType: {
468 if (!_need_verify) break;
469 const int name_ref_index = cp->name_ref_index_at(index);
470 const int signature_ref_index = cp->signature_ref_index_at(index);
471 check_property(valid_symbol_at(name_ref_index),
472 "Invalid constant pool index %u in class file %s",
473 name_ref_index, CHECK);
474 check_property(valid_symbol_at(signature_ref_index),
475 "Invalid constant pool index %u in class file %s",
476 signature_ref_index, CHECK);
477 break;
478 }
479 case JVM_CONSTANT_Utf8:
480 break;
481 case JVM_CONSTANT_UnresolvedClass: // fall-through
482 case JVM_CONSTANT_UnresolvedClassInError: {
483 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
484 break;
485 }
486 case JVM_CONSTANT_ClassIndex: {
487 const int class_index = cp->klass_index_at(index);
488 check_property(valid_symbol_at(class_index),
489 "Invalid constant pool index %u in class file %s",
490 class_index, CHECK);
491
492 Symbol* const name = cp->symbol_at(class_index);
493 const unsigned int name_len = name->utf8_length();
494
495 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
496 break;
497 }
498 case JVM_CONSTANT_StringIndex: {
499 const int string_index = cp->string_index_at(index);
500 check_property(valid_symbol_at(string_index),
501 "Invalid constant pool index %u in class file %s",
502 string_index, CHECK);
503 Symbol* const sym = cp->symbol_at(string_index);
504 cp->unresolved_string_at_put(index, sym);
505 break;
506 }
507 case JVM_CONSTANT_MethodHandle: {
508 const int ref_index = cp->method_handle_index_at(index);
509 check_property(valid_cp_range(ref_index, length),
510 "Invalid constant pool index %u in class file %s",
511 ref_index, CHECK);
512 const constantTag tag = cp->tag_at(ref_index);
513 const int ref_kind = cp->method_handle_ref_kind_at(index);
514
515 switch (ref_kind) {
516 case JVM_REF_getField:
517 case JVM_REF_getStatic:
518 case JVM_REF_putField:
519 case JVM_REF_putStatic: {
520 check_property(
521 tag.is_field(),
522 "Invalid constant pool index %u in class file %s (not a field)",
523 ref_index, CHECK);
524 break;
525 }
526 case JVM_REF_invokeVirtual:
527 case JVM_REF_newInvokeSpecial: {
528 check_property(
529 tag.is_method(),
530 "Invalid constant pool index %u in class file %s (not a method)",
531 ref_index, CHECK);
532 break;
533 }
534 case JVM_REF_invokeStatic:
535 case JVM_REF_invokeSpecial: {
536 check_property(
537 tag.is_method() ||
538 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
539 "Invalid constant pool index %u in class file %s (not a method)",
540 ref_index, CHECK);
541 break;
542 }
543 case JVM_REF_invokeInterface: {
544 check_property(
545 tag.is_interface_method(),
546 "Invalid constant pool index %u in class file %s (not an interface method)",
547 ref_index, CHECK);
548 break;
549 }
550 default: {
551 classfile_parse_error(
552 "Bad method handle kind at constant pool index %u in class file %s",
553 index, CHECK);
554 }
555 } // switch(refkind)
556 // Keep the ref_index unchanged. It will be indirected at link-time.
557 break;
558 } // case MethodHandle
559 case JVM_CONSTANT_MethodType: {
560 const int ref_index = cp->method_type_index_at(index);
561 check_property(valid_symbol_at(ref_index),
562 "Invalid constant pool index %u in class file %s",
563 ref_index, CHECK);
564 break;
565 }
566 case JVM_CONSTANT_Dynamic: {
567 const int name_and_type_ref_index =
568 cp->invoke_dynamic_name_and_type_ref_index_at(index);
569
570 check_property(valid_cp_range(name_and_type_ref_index, length) &&
571 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
572 "Invalid constant pool index %u in class file %s",
573 name_and_type_ref_index, CHECK);
574 // bootstrap specifier index must be checked later,
575 // when BootstrapMethods attr is available
576
577 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
578 cp->set_has_dynamic_constant();
579 break;
580 }
581 case JVM_CONSTANT_InvokeDynamic: {
582 const int name_and_type_ref_index =
583 cp->invoke_dynamic_name_and_type_ref_index_at(index);
584
585 check_property(valid_cp_range(name_and_type_ref_index, length) &&
586 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
587 "Invalid constant pool index %u in class file %s",
588 name_and_type_ref_index, CHECK);
589 // bootstrap specifier index must be checked later,
590 // when BootstrapMethods attr is available
591 break;
592 }
593 default: {
594 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
595 ShouldNotReachHere();
596 break;
597 }
598 } // switch(tag)
599 } // end of for
600
601 _first_patched_klass_resolved_index = num_klasses;
602 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
603
604 if (_cp_patches != NULL) {
605 // need to treat this_class specially...
606
607 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
608 // for now. These will be replaced with actual names of the patched classes in patch_class().
609 Symbol* s = vmSymbols::star_name();
610 for (int n=_orig_cp_size; n<cp->length(); n++) {
611 cp->symbol_at_put(n, s);
612 }
613
614 int this_class_index;
615 {
616 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
617 const u1* const mark = stream->current();
618 stream->skip_u2_fast(1); // skip flags
619 this_class_index = stream->get_u2_fast();
620 stream->set_current(mark); // revert to mark
621 }
622
623 for (index = 1; index < length; index++) { // Index 0 is unused
624 if (has_cp_patch_at(index)) {
625 guarantee_property(index != this_class_index,
626 "Illegal constant pool patch to self at %d in class file %s",
627 index, CHECK);
628 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
629 }
630 }
631 }
632
633 if (!_need_verify) {
634 return;
635 }
636
637 // second verification pass - checks the strings are of the right format.
638 // but not yet to the other entries
639 for (index = 1; index < length; index++) {
640 const jbyte tag = cp->tag_at(index).value();
641 switch (tag) {
642 case JVM_CONSTANT_UnresolvedClass: {
643 const Symbol* const class_name = cp->klass_name_at(index);
644 // check the name, even if _cp_patches will overwrite it
645 verify_legal_class_name(class_name, CHECK);
646 break;
647 }
648 case JVM_CONSTANT_NameAndType: {
649 if (_need_verify) {
650 const int sig_index = cp->signature_ref_index_at(index);
651 const int name_index = cp->name_ref_index_at(index);
652 const Symbol* const name = cp->symbol_at(name_index);
653 const Symbol* const sig = cp->symbol_at(sig_index);
654 guarantee_property(sig->utf8_length() != 0,
655 "Illegal zero length constant pool entry at %d in class %s",
656 sig_index, CHECK);
657 guarantee_property(name->utf8_length() != 0,
658 "Illegal zero length constant pool entry at %d in class %s",
659 name_index, CHECK);
660
661 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
662 // Format check method name and signature
663 verify_legal_method_name(name, CHECK);
664 verify_legal_method_signature(name, sig, CHECK);
665 } else {
666 // Format check field name and signature
667 verify_legal_field_name(name, CHECK);
668 verify_legal_field_signature(name, sig, CHECK);
669 }
670 }
671 break;
672 }
673 case JVM_CONSTANT_Dynamic: {
674 const int name_and_type_ref_index =
675 cp->name_and_type_ref_index_at(index);
676 // already verified to be utf8
677 const int name_ref_index =
678 cp->name_ref_index_at(name_and_type_ref_index);
679 // already verified to be utf8
680 const int signature_ref_index =
681 cp->signature_ref_index_at(name_and_type_ref_index);
682 const Symbol* const name = cp->symbol_at(name_ref_index);
683 const Symbol* const signature = cp->symbol_at(signature_ref_index);
684 if (_need_verify) {
685 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
686 // Need only to be sure signature is non-zero length and the right type.
687 if (signature->utf8_length() == 0 ||
688 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
689 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
690 }
691 }
692 break;
693 }
694 case JVM_CONSTANT_InvokeDynamic:
695 case JVM_CONSTANT_Fieldref:
696 case JVM_CONSTANT_Methodref:
697 case JVM_CONSTANT_InterfaceMethodref: {
698 const int name_and_type_ref_index =
699 cp->name_and_type_ref_index_at(index);
700 // already verified to be utf8
701 const int name_ref_index =
702 cp->name_ref_index_at(name_and_type_ref_index);
703 // already verified to be utf8
704 const int signature_ref_index =
705 cp->signature_ref_index_at(name_and_type_ref_index);
706 const Symbol* const name = cp->symbol_at(name_ref_index);
707 const Symbol* const signature = cp->symbol_at(signature_ref_index);
708 if (tag == JVM_CONSTANT_Fieldref) {
709 if (_need_verify) {
710 // Field name and signature are verified above, when iterating NameAndType_info.
711 // Need only to be sure signature is non-zero length and the right type.
712 if (signature->utf8_length() == 0 ||
713 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
714 throwIllegalSignature("Field", name, signature, CHECK);
715 }
716 }
717 } else {
718 if (_need_verify) {
719 // Method name and signature are verified above, when iterating NameAndType_info.
720 // Need only to be sure signature is non-zero length and the right type.
721 if (signature->utf8_length() == 0 ||
722 signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
723 throwIllegalSignature("Method", name, signature, CHECK);
724 }
725 }
726 // 4509014: If a class method name begins with '<', it must be "<init>"
727 const unsigned int name_len = name->utf8_length();
728 if (tag == JVM_CONSTANT_Methodref &&
729 name_len != 0 &&
730 name->byte_at(0) == '<' &&
731 name != vmSymbols::object_initializer_name()) {
732 classfile_parse_error(
733 "Bad method name at constant pool index %u in class file %s",
734 name_ref_index, CHECK);
735 }
736 }
737 break;
738 }
739 case JVM_CONSTANT_MethodHandle: {
740 const int ref_index = cp->method_handle_index_at(index);
741 const int ref_kind = cp->method_handle_ref_kind_at(index);
742 switch (ref_kind) {
743 case JVM_REF_invokeVirtual:
744 case JVM_REF_invokeStatic:
745 case JVM_REF_invokeSpecial:
746 case JVM_REF_newInvokeSpecial: {
747 const int name_and_type_ref_index =
748 cp->name_and_type_ref_index_at(ref_index);
749 const int name_ref_index =
750 cp->name_ref_index_at(name_and_type_ref_index);
751 const Symbol* const name = cp->symbol_at(name_ref_index);
752 if (ref_kind == JVM_REF_newInvokeSpecial) {
753 if (name != vmSymbols::object_initializer_name()) {
754 classfile_parse_error(
755 "Bad constructor name at constant pool index %u in class file %s",
756 name_ref_index, CHECK);
757 }
758 } else {
759 if (name == vmSymbols::object_initializer_name()) {
760 classfile_parse_error(
761 "Bad method name at constant pool index %u in class file %s",
762 name_ref_index, CHECK);
763 }
764 }
765 break;
766 }
767 // Other ref_kinds are already fully checked in previous pass.
768 } // switch(ref_kind)
769 break;
770 }
771 case JVM_CONSTANT_MethodType: {
772 const Symbol* const no_name = vmSymbols::type_name(); // place holder
773 const Symbol* const signature = cp->method_type_signature_at(index);
774 verify_legal_method_signature(no_name, signature, CHECK);
775 break;
776 }
777 case JVM_CONSTANT_Utf8: {
778 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
779 }
780 } // switch(tag)
781 } // end of for
782 }
783
784 Handle ClassFileParser::clear_cp_patch_at(int index) {
785 Handle patch = cp_patch_at(index);
786 _cp_patches->at_put(index, Handle());
787 assert(!has_cp_patch_at(index), "");
788 return patch;
789 }
790
791 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
792 int name_index = _orig_cp_size + _num_patched_klasses;
793 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
794
795 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
796 _num_patched_klasses ++;
797 }
798
799 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
800 int index,
801 Handle patch,
802 TRAPS) {
803 assert(cp != NULL, "invariant");
804
805 BasicType patch_type = T_VOID;
806
807 switch (cp->tag_at(index).value()) {
808
809 case JVM_CONSTANT_UnresolvedClass: {
810 // Patching a class means pre-resolving it.
811 // The name in the constant pool is ignored.
812 if (java_lang_Class::is_instance(patch())) {
813 guarantee_property(!java_lang_Class::is_primitive(patch()),
814 "Illegal class patch at %d in class file %s",
815 index, CHECK);
816 Klass* k = java_lang_Class::as_Klass(patch());
817 patch_class(cp, index, k, k->name());
818 } else {
819 guarantee_property(java_lang_String::is_instance(patch()),
820 "Illegal class patch at %d in class file %s",
821 index, CHECK);
822 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK);
823 patch_class(cp, index, NULL, name);
824 }
825 break;
826 }
827
828 case JVM_CONSTANT_String: {
829 // skip this patch and don't clear it. Needs the oop array for resolved
830 // references to be created first.
831 return;
832 }
833 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
834 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
835 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
836 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
837 patch_prim:
838 {
839 jvalue value;
840 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
841 guarantee_property(value_type == patch_type,
842 "Illegal primitive patch at %d in class file %s",
843 index, CHECK);
844 switch (value_type) {
845 case T_INT: cp->int_at_put(index, value.i); break;
846 case T_FLOAT: cp->float_at_put(index, value.f); break;
847 case T_LONG: cp->long_at_put(index, value.j); break;
848 case T_DOUBLE: cp->double_at_put(index, value.d); break;
849 default: assert(false, "");
850 }
851 } // end patch_prim label
852 break;
853
854 default: {
855 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
856 guarantee_property(!has_cp_patch_at(index),
857 "Illegal unexpected patch at %d in class file %s",
858 index, CHECK);
859 return;
860 }
861 } // end of switch(tag)
862
863 // On fall-through, mark the patch as used.
864 clear_cp_patch_at(index);
865 }
866 class NameSigHash: public ResourceObj {
867 public:
868 const Symbol* _name; // name
869 const Symbol* _sig; // signature
870 NameSigHash* _next; // Next entry in hash table
871 };
872
873 static const int HASH_ROW_SIZE = 256;
874
875 static unsigned int hash(const Symbol* name, const Symbol* sig) {
876 unsigned int raw_hash = 0;
877 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
878 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
879
880 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
881 }
882
883
884 static void initialize_hashtable(NameSigHash** table) {
885 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
886 }
887 // Return false if the name/sig combination is found in table.
888 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
889 // The old format checker uses heap sort to find duplicates.
890 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
891 // of table since we don't expect Symbol*'s to move.
892 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
893 assert(name != NULL, "name in constant pool is NULL");
894
895 // First lookup for duplicates
896 int index = hash(name, sig);
897 NameSigHash* entry = table[index];
898 while (entry != NULL) {
899 if (entry->_name == name && entry->_sig == sig) {
900 return false;
901 }
902 entry = entry->_next;
903 }
904
905 // No duplicate is found, allocate a new entry and fill it.
906 entry = new NameSigHash();
907 entry->_name = name;
908 entry->_sig = sig;
909
910 // Insert into hash table
911 entry->_next = table[index];
912 table[index] = entry;
913
914 return true;
915 }
916
917 // Side-effects: populates the _local_interfaces field
918 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
919 const int itfs_len,
920 ConstantPool* const cp,
921 bool* const has_nonstatic_concrete_methods,
922 TRAPS) {
923 assert(stream != NULL, "invariant");
924 assert(cp != NULL, "invariant");
925 assert(has_nonstatic_concrete_methods != NULL, "invariant");
926
927 if (itfs_len == 0) {
928 _local_interfaces = Universe::the_empty_klass_array();
929 } else {
930 assert(itfs_len > 0, "only called for len>0");
931 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, itfs_len, NULL, CHECK);
932
933 int index;
934 for (index = 0; index < itfs_len; index++) {
935 const u2 interface_index = stream->get_u2(CHECK);
936 Klass* interf;
937 check_property(
938 valid_klass_reference_at(interface_index),
939 "Interface name has bad constant pool index %u in class file %s",
940 interface_index, CHECK);
941 if (cp->tag_at(interface_index).is_klass()) {
942 interf = cp->resolved_klass_at(interface_index);
943 } else {
944 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
945
946 // Don't need to check legal name because it's checked when parsing constant pool.
947 // But need to make sure it's not an array type.
948 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
949 "Bad interface name in class file %s", CHECK);
950
951 // Call resolve_super so classcircularity is checked
952 interf = SystemDictionary::resolve_super_or_fail(
953 _class_name,
954 unresolved_klass,
955 Handle(THREAD, _loader_data->class_loader()),
956 _protection_domain,
957 false,
958 CHECK);
959 }
960
961 if (!interf->is_interface()) {
962 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
963 "Implementing class");
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 STATIC_FLATTENABLE, // flattenable field
1462 NONSTATIC_OOP,
1463 NONSTATIC_BYTE,
1464 NONSTATIC_SHORT,
1465 NONSTATIC_WORD,
1466 NONSTATIC_DOUBLE,
1467 NONSTATIC_FLATTENABLE,
1468 MAX_FIELD_ALLOCATION_TYPE,
1469 BAD_ALLOCATION_TYPE = -1
1470 };
1471
1472 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1473 BAD_ALLOCATION_TYPE, // 0
1474 BAD_ALLOCATION_TYPE, // 1
1475 BAD_ALLOCATION_TYPE, // 2
1476 BAD_ALLOCATION_TYPE, // 3
1477 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1478 NONSTATIC_SHORT, // T_CHAR = 5,
1479 NONSTATIC_WORD, // T_FLOAT = 6,
1480 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1481 NONSTATIC_BYTE, // T_BYTE = 8,
1482 NONSTATIC_SHORT, // T_SHORT = 9,
1483 NONSTATIC_WORD, // T_INT = 10,
1484 NONSTATIC_DOUBLE, // T_LONG = 11,
1485 NONSTATIC_OOP, // T_OBJECT = 12,
1486 NONSTATIC_OOP, // T_ARRAY = 13,
1487 NONSTATIC_OOP, // T_VALUETYPE = 14,
1488 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1489 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1490 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1491 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1492 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1493 BAD_ALLOCATION_TYPE, // T_VALUETYPEPTR= 20,
1494 BAD_ALLOCATION_TYPE, // T_CONFLICT = 21,
1495 BAD_ALLOCATION_TYPE, // 0
1496 BAD_ALLOCATION_TYPE, // 1
1497 BAD_ALLOCATION_TYPE, // 2
1498 BAD_ALLOCATION_TYPE, // 3
1499 STATIC_BYTE , // T_BOOLEAN = 4,
1500 STATIC_SHORT, // T_CHAR = 5,
1501 STATIC_WORD, // T_FLOAT = 6,
1502 STATIC_DOUBLE, // T_DOUBLE = 7,
1503 STATIC_BYTE, // T_BYTE = 8,
1504 STATIC_SHORT, // T_SHORT = 9,
1505 STATIC_WORD, // T_INT = 10,
1506 STATIC_DOUBLE, // T_LONG = 11,
1507 STATIC_OOP, // T_OBJECT = 12,
1508 STATIC_OOP, // T_ARRAY = 13,
1509 STATIC_OOP, // T_VALUETYPE = 14,
1510 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1511 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1512 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1513 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1514 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1515 BAD_ALLOCATION_TYPE, // T_VALUETYPEPTR= 20,
1516 BAD_ALLOCATION_TYPE, // T_CONFLICT = 21,
1517 };
1518
1519 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type, bool is_flattenable) {
1520 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1521 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1522 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1523 if (is_flattenable) {
1524 result = is_static ? STATIC_FLATTENABLE : NONSTATIC_FLATTENABLE;
1525 }
1526 return result;
1527 }
1528
1529 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1530 public:
1531 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1532
1533 FieldAllocationCount() {
1534 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1535 count[i] = 0;
1536 }
1537 }
1538
1539 FieldAllocationType update(bool is_static, BasicType type, bool is_flattenable) {
1540 FieldAllocationType atype = basic_type_to_atype(is_static, type, is_flattenable);
1541 if (atype != BAD_ALLOCATION_TYPE) {
1542 // Make sure there is no overflow with injected fields.
1543 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1544 count[atype]++;
1545 }
1546 return atype;
1547 }
1548 };
1549
1550 // Side-effects: populates the _fields, _fields_annotations,
1551 // _fields_type_annotations fields
1552 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1553 bool is_interface,
1554 bool is_value_type,
1555 FieldAllocationCount* const fac,
1556 ConstantPool* cp,
1557 const int cp_size,
1558 u2* const java_fields_count_ptr,
1559 TRAPS) {
1560
1561 assert(cfs != NULL, "invariant");
1562 assert(fac != NULL, "invariant");
1563 assert(cp != NULL, "invariant");
1564 assert(java_fields_count_ptr != NULL, "invariant");
1565
1566 assert(NULL == _fields, "invariant");
1567 assert(NULL == _fields_annotations, "invariant");
1568 assert(NULL == _fields_type_annotations, "invariant");
1569
1570 cfs->guarantee_more(2, CHECK); // length
1571 const u2 length = cfs->get_u2_fast();
1572 *java_fields_count_ptr = length;
1573
1574 int num_injected = 0;
1575 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1576 &num_injected);
1577
1578 const int total_fields = length + num_injected + (is_value_type ? 1 : 0);
1579
1580 // The field array starts with tuples of shorts
1581 // [access, name index, sig index, initial value index, byte offset].
1582 // A generic signature slot only exists for field with generic
1583 // signature attribute. And the access flag is set with
1584 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1585 // signature slots are at the end of the field array and after all
1586 // other fields data.
1587 //
1588 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1589 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1590 // ...
1591 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1592 // [generic signature index]
1593 // [generic signature index]
1594 // ...
1595 //
1596 // Allocate a temporary resource array for field data. For each field,
1597 // a slot is reserved in the temporary array for the generic signature
1598 // index. After parsing all fields, the data are copied to a permanent
1599 // array and any unused slots will be discarded.
1600 ResourceMark rm(THREAD);
1601 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1602 u2,
1603 total_fields * (FieldInfo::field_slots + 1));
1604
1605 // The generic signature slots start after all other fields' data.
1606 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1607 int num_generic_signature = 0;
1608 for (int n = 0; n < length; n++) {
1609 // access_flags, name_index, descriptor_index, attributes_count
1610 cfs->guarantee_more(8, CHECK);
1611
1612 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1613 // JVM_ACC_FLATTENABLE is defined for class file version 55 and later
1614 if (supports_value_types()) {
1615 recognized_modifiers |= JVM_ACC_FLATTENABLE;
1616 }
1617
1618 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1619 verify_legal_field_modifiers(flags, is_interface, is_value_type, CHECK);
1620 AccessFlags access_flags;
1621 access_flags.set_flags(flags);
1622
1623 const u2 name_index = cfs->get_u2_fast();
1624 check_property(valid_symbol_at(name_index),
1625 "Invalid constant pool index %u for field name in class file %s",
1626 name_index, CHECK);
1627 const Symbol* const name = cp->symbol_at(name_index);
1628 verify_legal_field_name(name, CHECK);
1629
1630 const u2 signature_index = cfs->get_u2_fast();
1631 check_property(valid_symbol_at(signature_index),
1632 "Invalid constant pool index %u for field signature in class file %s",
1633 signature_index, CHECK);
1634 const Symbol* const sig = cp->symbol_at(signature_index);
1635 verify_legal_field_signature(name, sig, CHECK);
1636 if (access_flags.is_flattenable()) {
1637 // Array flattenability cannot be specified. Arrays of value classes are
1638 // are always flattenable. Arrays of other classes are not flattenable.
1639 if (sig->utf8_length() > 1 && sig->byte_at(0) == '[') {
1640 classfile_parse_error(
1641 "Field \"%s\" with signature \"%s\" in class file %s is invalid."
1642 " ACC_FLATTENABLE cannot be specified for an array",
1643 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1644 }
1645 _has_flattenable_fields = true;
1646 }
1647
1648 u2 constantvalue_index = 0;
1649 bool is_synthetic = false;
1650 u2 generic_signature_index = 0;
1651 const bool is_static = access_flags.is_static();
1652 FieldAnnotationCollector parsed_annotations(_loader_data);
1653
1654 const u2 attributes_count = cfs->get_u2_fast();
1655 if (attributes_count > 0) {
1656 parse_field_attributes(cfs,
1657 attributes_count,
1658 is_static,
1659 signature_index,
1660 &constantvalue_index,
1661 &is_synthetic,
1662 &generic_signature_index,
1663 &parsed_annotations,
1664 CHECK);
1665
1666 if (parsed_annotations.field_annotations() != NULL) {
1667 if (_fields_annotations == NULL) {
1668 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1669 _loader_data, length, NULL,
1670 CHECK);
1671 }
1672 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1673 parsed_annotations.set_field_annotations(NULL);
1674 }
1675 if (parsed_annotations.field_type_annotations() != NULL) {
1676 if (_fields_type_annotations == NULL) {
1677 _fields_type_annotations =
1678 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1679 length,
1680 NULL,
1681 CHECK);
1682 }
1683 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1684 parsed_annotations.set_field_type_annotations(NULL);
1685 }
1686
1687 if (is_synthetic) {
1688 access_flags.set_is_synthetic();
1689 }
1690 if (generic_signature_index != 0) {
1691 access_flags.set_field_has_generic_signature();
1692 fa[generic_signature_slot] = generic_signature_index;
1693 generic_signature_slot ++;
1694 num_generic_signature ++;
1695 }
1696 }
1697
1698 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1699 field->initialize(access_flags.as_short(),
1700 name_index,
1701 signature_index,
1702 constantvalue_index);
1703 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1704
1705 // Remember how many oops we encountered and compute allocation type
1706 const FieldAllocationType atype = fac->update(is_static, type, access_flags.is_flattenable());
1707 field->set_allocation_type(atype);
1708
1709 // After field is initialized with type, we can augment it with aux info
1710 if (parsed_annotations.has_any_annotations())
1711 parsed_annotations.apply_to(field);
1712 }
1713
1714 int index = length;
1715 if (num_injected != 0) {
1716 for (int n = 0; n < num_injected; n++) {
1717 // Check for duplicates
1718 if (injected[n].may_be_java) {
1719 const Symbol* const name = injected[n].name();
1720 const Symbol* const signature = injected[n].signature();
1721 bool duplicate = false;
1722 for (int i = 0; i < length; i++) {
1723 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1724 if (name == cp->symbol_at(f->name_index()) &&
1725 signature == cp->symbol_at(f->signature_index())) {
1726 // Symbol is desclared in Java so skip this one
1727 duplicate = true;
1728 break;
1729 }
1730 }
1731 if (duplicate) {
1732 // These will be removed from the field array at the end
1733 continue;
1734 }
1735 }
1736
1737 // Injected field
1738 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1739 field->initialize(JVM_ACC_FIELD_INTERNAL,
1740 injected[n].name_index,
1741 injected[n].signature_index,
1742 0);
1743
1744 const BasicType type = FieldType::basic_type(injected[n].signature());
1745
1746 // Remember how many oops we encountered and compute allocation type
1747 const FieldAllocationType atype = fac->update(false, type, false);
1748 field->set_allocation_type(atype);
1749 index++;
1750 }
1751 }
1752
1753 if (is_value_type) {
1754 index = length + num_injected;
1755 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1756 field->initialize(JVM_ACC_FIELD_INTERNAL | JVM_ACC_STATIC,
1757 vmSymbols::default_value_name_enum,
1758 vmSymbols::java_lang_Object_enum,
1759 0);
1760 const BasicType type = FieldType::basic_type(vmSymbols::object_signature());
1761 const FieldAllocationType atype = fac->update(true, type, false);
1762 field->set_allocation_type(atype);
1763 index++;
1764 }
1765
1766 assert(NULL == _fields, "invariant");
1767
1768 _fields =
1769 MetadataFactory::new_array<u2>(_loader_data,
1770 index * FieldInfo::field_slots + num_generic_signature,
1771 CHECK);
1772 // Sometimes injected fields already exist in the Java source so
1773 // the fields array could be too long. In that case the
1774 // fields array is trimed. Also unused slots that were reserved
1775 // for generic signature indexes are discarded.
1776 {
1777 int i = 0;
1778 for (; i < index * FieldInfo::field_slots; i++) {
1779 _fields->at_put(i, fa[i]);
1780 }
1781 for (int j = total_fields * FieldInfo::field_slots;
1782 j < generic_signature_slot; j++) {
1783 _fields->at_put(i++, fa[j]);
1784 }
1785 assert(_fields->length() == i, "");
1786 }
1787
1788 if (_need_verify && length > 1) {
1789 // Check duplicated fields
1790 ResourceMark rm(THREAD);
1791 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1792 THREAD, NameSigHash*, HASH_ROW_SIZE);
1793 initialize_hashtable(names_and_sigs);
1794 bool dup = false;
1795 const Symbol* name = NULL;
1796 const Symbol* sig = NULL;
1797 {
1798 debug_only(NoSafepointVerifier nsv;)
1799 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1800 name = fs.name();
1801 sig = fs.signature();
1802 // If no duplicates, add name/signature in hashtable names_and_sigs.
1803 if (!put_after_lookup(name, sig, names_and_sigs)) {
1804 dup = true;
1805 break;
1806 }
1807 }
1808 }
1809 if (dup) {
1810 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1811 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1812 }
1813 }
1814 }
1815
1816
1817 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1818 u4 code_length,
1819 u4 exception_table_length,
1820 TRAPS) {
1821 assert(cfs != NULL, "invariant");
1822
1823 const unsafe_u2* const exception_table_start = cfs->current();
1824 assert(exception_table_start != NULL, "null exception table");
1825
1826 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1827 // end_pc,
1828 // handler_pc,
1829 // catch_type_index
1830
1831 // Will check legal target after parsing code array in verifier.
1832 if (_need_verify) {
1833 for (unsigned int i = 0; i < exception_table_length; i++) {
1834 const u2 start_pc = cfs->get_u2_fast();
1835 const u2 end_pc = cfs->get_u2_fast();
1836 const u2 handler_pc = cfs->get_u2_fast();
1837 const u2 catch_type_index = cfs->get_u2_fast();
1838 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1839 "Illegal exception table range in class file %s",
1840 CHECK_NULL);
1841 guarantee_property(handler_pc < code_length,
1842 "Illegal exception table handler in class file %s",
1843 CHECK_NULL);
1844 if (catch_type_index != 0) {
1845 guarantee_property(valid_klass_reference_at(catch_type_index),
1846 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1847 }
1848 }
1849 } else {
1850 cfs->skip_u2_fast(exception_table_length * 4);
1851 }
1852 return exception_table_start;
1853 }
1854
1855 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1856 u4 code_length,
1857 CompressedLineNumberWriteStream**const write_stream,
1858 TRAPS) {
1859
1860 const ClassFileStream* const cfs = _stream;
1861 unsigned int num_entries = cfs->get_u2(CHECK);
1862
1863 // Each entry is a u2 start_pc, and a u2 line_number
1864 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1865
1866 // Verify line number attribute and table length
1867 check_property(
1868 code_attribute_length == sizeof(u2) + length_in_bytes,
1869 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1870
1871 cfs->guarantee_more(length_in_bytes, CHECK);
1872
1873 if ((*write_stream) == NULL) {
1874 if (length_in_bytes > fixed_buffer_size) {
1875 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1876 } else {
1877 (*write_stream) = new CompressedLineNumberWriteStream(
1878 _linenumbertable_buffer, fixed_buffer_size);
1879 }
1880 }
1881
1882 while (num_entries-- > 0) {
1883 const u2 bci = cfs->get_u2_fast(); // start_pc
1884 const u2 line = cfs->get_u2_fast(); // line_number
1885 guarantee_property(bci < code_length,
1886 "Invalid pc in LineNumberTable in class file %s", CHECK);
1887 (*write_stream)->write_pair(bci, line);
1888 }
1889 }
1890
1891
1892 class LVT_Hash : public AllStatic {
1893 public:
1894
1895 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1896 /*
1897 * 3-tuple start_bci/length/slot has to be unique key,
1898 * so the following comparison seems to be redundant:
1899 * && elem->name_cp_index == entry->_elem->name_cp_index
1900 */
1901 return (e0.start_bci == e1.start_bci &&
1902 e0.length == e1.length &&
1903 e0.name_cp_index == e1.name_cp_index &&
1904 e0.slot == e1.slot);
1905 }
1906
1907 static unsigned int hash(LocalVariableTableElement const& e0) {
1908 unsigned int raw_hash = e0.start_bci;
1909
1910 raw_hash = e0.length + raw_hash * 37;
1911 raw_hash = e0.name_cp_index + raw_hash * 37;
1912 raw_hash = e0.slot + raw_hash * 37;
1913
1914 return raw_hash;
1915 }
1916 };
1917
1918
1919 // Class file LocalVariableTable elements.
1920 class Classfile_LVT_Element {
1921 public:
1922 u2 start_bci;
1923 u2 length;
1924 u2 name_cp_index;
1925 u2 descriptor_cp_index;
1926 u2 slot;
1927 };
1928
1929 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1930 LocalVariableTableElement* const lvt) {
1931 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1932 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1933 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1934 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1935 lvt->signature_cp_index = 0;
1936 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1937 }
1938
1939 // Function is used to parse both attributes:
1940 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1941 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1942 u4 code_length,
1943 u2 max_locals,
1944 u4 code_attribute_length,
1945 u2* const localvariable_table_length,
1946 bool isLVTT,
1947 TRAPS) {
1948 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1949 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1950 const unsigned int size =
1951 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1952
1953 const ConstantPool* const cp = _cp;
1954
1955 // Verify local variable table attribute has right length
1956 if (_need_verify) {
1957 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1958 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1959 }
1960
1961 const unsafe_u2* const localvariable_table_start = cfs->current();
1962 assert(localvariable_table_start != NULL, "null local variable table");
1963 if (!_need_verify) {
1964 cfs->skip_u2_fast(size);
1965 } else {
1966 cfs->guarantee_more(size * 2, CHECK_NULL);
1967 for(int i = 0; i < (*localvariable_table_length); i++) {
1968 const u2 start_pc = cfs->get_u2_fast();
1969 const u2 length = cfs->get_u2_fast();
1970 const u2 name_index = cfs->get_u2_fast();
1971 const u2 descriptor_index = cfs->get_u2_fast();
1972 const u2 index = cfs->get_u2_fast();
1973 // Assign to a u4 to avoid overflow
1974 const u4 end_pc = (u4)start_pc + (u4)length;
1975
1976 if (start_pc >= code_length) {
1977 classfile_parse_error(
1978 "Invalid start_pc %u in %s in class file %s",
1979 start_pc, tbl_name, CHECK_NULL);
1980 }
1981 if (end_pc > code_length) {
1982 classfile_parse_error(
1983 "Invalid length %u in %s in class file %s",
1984 length, tbl_name, CHECK_NULL);
1985 }
1986 const int cp_size = cp->length();
1987 guarantee_property(valid_symbol_at(name_index),
1988 "Name index %u in %s has bad constant type in class file %s",
1989 name_index, tbl_name, CHECK_NULL);
1990 guarantee_property(valid_symbol_at(descriptor_index),
1991 "Signature index %u in %s has bad constant type in class file %s",
1992 descriptor_index, tbl_name, CHECK_NULL);
1993
1994 const Symbol* const name = cp->symbol_at(name_index);
1995 const Symbol* const sig = cp->symbol_at(descriptor_index);
1996 verify_legal_field_name(name, CHECK_NULL);
1997 u2 extra_slot = 0;
1998 if (!isLVTT) {
1999 verify_legal_field_signature(name, sig, CHECK_NULL);
2000
2001 // 4894874: check special cases for double and long local variables
2002 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
2003 sig == vmSymbols::type_signature(T_LONG)) {
2004 extra_slot = 1;
2005 }
2006 }
2007 guarantee_property((index + extra_slot) < max_locals,
2008 "Invalid index %u in %s in class file %s",
2009 index, tbl_name, CHECK_NULL);
2010 }
2011 }
2012 return localvariable_table_start;
2013 }
2014
2015
2016 void ClassFileParser::parse_type_array(u2 array_length,
2017 u4 code_length,
2018 u4* const u1_index,
2019 u4* const u2_index,
2020 u1* const u1_array,
2021 u2* const u2_array,
2022 TRAPS) {
2023 const ClassFileStream* const cfs = _stream;
2024 u2 index = 0; // index in the array with long/double occupying two slots
2025 u4 i1 = *u1_index;
2026 u4 i2 = *u2_index + 1;
2027 for(int i = 0; i < array_length; i++) {
2028 const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
2029 index++;
2030 if (tag == ITEM_Long || tag == ITEM_Double) {
2031 index++;
2032 } else if (tag == ITEM_Object) {
2033 const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
2034 guarantee_property(valid_klass_reference_at(class_index),
2035 "Bad class index %u in StackMap in class file %s",
2036 class_index, CHECK);
2037 } else if (tag == ITEM_Uninitialized) {
2038 const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
2039 guarantee_property(
2040 offset < code_length,
2041 "Bad uninitialized type offset %u in StackMap in class file %s",
2042 offset, CHECK);
2043 } else {
2044 guarantee_property(
2045 tag <= (u1)ITEM_Uninitialized,
2046 "Unknown variable type %u in StackMap in class file %s",
2047 tag, CHECK);
2048 }
2049 }
2050 u2_array[*u2_index] = index;
2051 *u1_index = i1;
2052 *u2_index = i2;
2053 }
2054
2055 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
2056 u4 code_attribute_length,
2057 bool need_verify,
2058 TRAPS) {
2059 assert(cfs != NULL, "invariant");
2060
2061 if (0 == code_attribute_length) {
2062 return NULL;
2063 }
2064
2065 const u1* const stackmap_table_start = cfs->current();
2066 assert(stackmap_table_start != NULL, "null stackmap table");
2067
2068 // check code_attribute_length first
2069 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2070
2071 if (!need_verify && !DumpSharedSpaces) {
2072 return NULL;
2073 }
2074 return stackmap_table_start;
2075 }
2076
2077 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2078 u2* const checked_exceptions_length,
2079 u4 method_attribute_length,
2080 TRAPS) {
2081 assert(cfs != NULL, "invariant");
2082 assert(checked_exceptions_length != NULL, "invariant");
2083
2084 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2085 *checked_exceptions_length = cfs->get_u2_fast();
2086 const unsigned int size =
2087 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2088 const unsafe_u2* const checked_exceptions_start = cfs->current();
2089 assert(checked_exceptions_start != NULL, "null checked exceptions");
2090 if (!_need_verify) {
2091 cfs->skip_u2_fast(size);
2092 } else {
2093 // Verify each value in the checked exception table
2094 u2 checked_exception;
2095 const u2 len = *checked_exceptions_length;
2096 cfs->guarantee_more(2 * len, CHECK_NULL);
2097 for (int i = 0; i < len; i++) {
2098 checked_exception = cfs->get_u2_fast();
2099 check_property(
2100 valid_klass_reference_at(checked_exception),
2101 "Exception name has bad type at constant pool %u in class file %s",
2102 checked_exception, CHECK_NULL);
2103 }
2104 }
2105 // check exceptions attribute length
2106 if (_need_verify) {
2107 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2108 sizeof(u2) * size),
2109 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2110 }
2111 return checked_exceptions_start;
2112 }
2113
2114 void ClassFileParser::throwIllegalSignature(const char* type,
2115 const Symbol* name,
2116 const Symbol* sig,
2117 TRAPS) const {
2118 assert(name != NULL, "invariant");
2119 assert(sig != NULL, "invariant");
2120
2121 ResourceMark rm(THREAD);
2122 Exceptions::fthrow(THREAD_AND_LOCATION,
2123 vmSymbols::java_lang_ClassFormatError(),
2124 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2125 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2126 }
2127
2128 AnnotationCollector::ID
2129 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2130 const Symbol* name) {
2131 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2132 // Privileged code can use all annotations. Other code silently drops some.
2133 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2134 loader_data->is_platform_class_loader_data() ||
2135 loader_data->is_anonymous();
2136 switch (sid) {
2137 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2138 if (_location != _in_method) break; // only allow for methods
2139 if (!privileged) break; // only allow in privileged code
2140 return _method_CallerSensitive;
2141 }
2142 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2143 if (_location != _in_method) break; // only allow for methods
2144 if (!privileged) break; // only allow in privileged code
2145 return _method_ForceInline;
2146 }
2147 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2148 if (_location != _in_method) break; // only allow for methods
2149 if (!privileged) break; // only allow in privileged code
2150 return _method_DontInline;
2151 }
2152 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2153 if (_location != _in_method) break; // only allow for methods
2154 if (!privileged) break; // only allow in privileged code
2155 return _method_InjectedProfile;
2156 }
2157 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2158 if (_location != _in_method) break; // only allow for methods
2159 if (!privileged) break; // only allow in privileged code
2160 return _method_LambdaForm_Compiled;
2161 }
2162 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): {
2163 if (_location != _in_method) break; // only allow for methods
2164 if (!privileged) break; // only allow in privileged code
2165 return _method_LambdaForm_Hidden;
2166 }
2167 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2168 if (_location != _in_method) break; // only allow for methods
2169 if (!privileged) break; // only allow in privileged code
2170 return _method_HotSpotIntrinsicCandidate;
2171 }
2172 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2173 if (_location != _in_field) break; // only allow for fields
2174 if (!privileged) break; // only allow in privileged code
2175 return _field_Stable;
2176 }
2177 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2178 if (_location != _in_field && _location != _in_class) {
2179 break; // only allow for fields and classes
2180 }
2181 if (!EnableContended || (RestrictContended && !privileged)) {
2182 break; // honor privileges
2183 }
2184 return _jdk_internal_vm_annotation_Contended;
2185 }
2186 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2187 if (_location != _in_method) break; // only allow for methods
2188 if (RestrictReservedStack && !privileged) break; // honor privileges
2189 return _jdk_internal_vm_annotation_ReservedStackAccess;
2190 }
2191 default: {
2192 break;
2193 }
2194 }
2195 return AnnotationCollector::_unknown;
2196 }
2197
2198 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2199 if (is_contended())
2200 f->set_contended_group(contended_group());
2201 if (is_stable())
2202 f->set_stable(true);
2203 }
2204
2205 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2206 // If there's an error deallocate metadata for field annotations
2207 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2208 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2209 }
2210
2211 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2212 if (has_annotation(_method_CallerSensitive))
2213 m->set_caller_sensitive(true);
2214 if (has_annotation(_method_ForceInline))
2215 m->set_force_inline(true);
2216 if (has_annotation(_method_DontInline))
2217 m->set_dont_inline(true);
2218 if (has_annotation(_method_InjectedProfile))
2219 m->set_has_injected_profile(true);
2220 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2221 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2222 if (has_annotation(_method_LambdaForm_Hidden))
2223 m->set_hidden(true);
2224 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2225 m->set_intrinsic_candidate(true);
2226 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2227 m->set_has_reserved_stack_access(true);
2228 }
2229
2230 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2231 assert(ik != NULL, "invariant");
2232 ik->set_is_contended(is_contended());
2233 }
2234
2235 #define MAX_ARGS_SIZE 255
2236 #define MAX_CODE_SIZE 65535
2237 #define INITIAL_MAX_LVT_NUMBER 256
2238
2239 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2240 *
2241 * Rules for LVT's and LVTT's are:
2242 * - There can be any number of LVT's and LVTT's.
2243 * - If there are n LVT's, it is the same as if there was just
2244 * one LVT containing all the entries from the n LVT's.
2245 * - There may be no more than one LVT entry per local variable.
2246 * Two LVT entries are 'equal' if these fields are the same:
2247 * start_pc, length, name, slot
2248 * - There may be no more than one LVTT entry per each LVT entry.
2249 * Each LVTT entry has to match some LVT entry.
2250 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2251 */
2252 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2253 int lvt_cnt,
2254 u2* const localvariable_table_length,
2255 const unsafe_u2** const localvariable_table_start,
2256 int lvtt_cnt,
2257 u2* const localvariable_type_table_length,
2258 const unsafe_u2** const localvariable_type_table_start,
2259 TRAPS) {
2260
2261 ResourceMark rm(THREAD);
2262
2263 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2264 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2265
2266 LVT_HashTable* const table = new LVT_HashTable();
2267
2268 // To fill LocalVariableTable in
2269 const Classfile_LVT_Element* cf_lvt;
2270 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2271
2272 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2273 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2274 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2275 copy_lvt_element(&cf_lvt[idx], lvt);
2276 // If no duplicates, add LVT elem in hashtable.
2277 if (table->put(*lvt, lvt) == false
2278 && _need_verify
2279 && _major_version >= JAVA_1_5_VERSION) {
2280 classfile_parse_error("Duplicated LocalVariableTable attribute "
2281 "entry for '%s' in class file %s",
2282 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2283 CHECK);
2284 }
2285 }
2286 }
2287
2288 // To merge LocalVariableTable and LocalVariableTypeTable
2289 const Classfile_LVT_Element* cf_lvtt;
2290 LocalVariableTableElement lvtt_elem;
2291
2292 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2293 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2294 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2295 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2296 LocalVariableTableElement** entry = table->get(lvtt_elem);
2297 if (entry == NULL) {
2298 if (_need_verify) {
2299 classfile_parse_error("LVTT entry for '%s' in class file %s "
2300 "does not match any LVT entry",
2301 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2302 CHECK);
2303 }
2304 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2305 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2306 "entry for '%s' in class file %s",
2307 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2308 CHECK);
2309 } else {
2310 // to add generic signatures into LocalVariableTable
2311 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2312 }
2313 }
2314 }
2315 }
2316
2317
2318 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2319 const u1* runtime_visible_annotations,
2320 int runtime_visible_annotations_length,
2321 const u1* runtime_invisible_annotations,
2322 int runtime_invisible_annotations_length,
2323 const u1* runtime_visible_parameter_annotations,
2324 int runtime_visible_parameter_annotations_length,
2325 const u1* runtime_invisible_parameter_annotations,
2326 int runtime_invisible_parameter_annotations_length,
2327 const u1* runtime_visible_type_annotations,
2328 int runtime_visible_type_annotations_length,
2329 const u1* runtime_invisible_type_annotations,
2330 int runtime_invisible_type_annotations_length,
2331 const u1* annotation_default,
2332 int annotation_default_length,
2333 TRAPS) {
2334
2335 AnnotationArray* a;
2336
2337 if (runtime_visible_annotations_length +
2338 runtime_invisible_annotations_length > 0) {
2339 a = assemble_annotations(runtime_visible_annotations,
2340 runtime_visible_annotations_length,
2341 runtime_invisible_annotations,
2342 runtime_invisible_annotations_length,
2343 CHECK);
2344 cm->set_method_annotations(a);
2345 }
2346
2347 if (runtime_visible_parameter_annotations_length +
2348 runtime_invisible_parameter_annotations_length > 0) {
2349 a = assemble_annotations(runtime_visible_parameter_annotations,
2350 runtime_visible_parameter_annotations_length,
2351 runtime_invisible_parameter_annotations,
2352 runtime_invisible_parameter_annotations_length,
2353 CHECK);
2354 cm->set_parameter_annotations(a);
2355 }
2356
2357 if (annotation_default_length > 0) {
2358 a = assemble_annotations(annotation_default,
2359 annotation_default_length,
2360 NULL,
2361 0,
2362 CHECK);
2363 cm->set_default_annotations(a);
2364 }
2365
2366 if (runtime_visible_type_annotations_length +
2367 runtime_invisible_type_annotations_length > 0) {
2368 a = assemble_annotations(runtime_visible_type_annotations,
2369 runtime_visible_type_annotations_length,
2370 runtime_invisible_type_annotations,
2371 runtime_invisible_type_annotations_length,
2372 CHECK);
2373 cm->set_type_annotations(a);
2374 }
2375 }
2376
2377
2378 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2379 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2380 // Method* to save footprint, so we only know the size of the resulting Method* when the
2381 // entire method attribute is parsed.
2382 //
2383 // The promoted_flags parameter is used to pass relevant access_flags
2384 // from the method back up to the containing klass. These flag values
2385 // are added to klass's access_flags.
2386
2387 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2388 bool is_interface,
2389 bool is_value_type,
2390 const ConstantPool* cp,
2391 AccessFlags* const promoted_flags,
2392 TRAPS) {
2393 assert(cfs != NULL, "invariant");
2394 assert(cp != NULL, "invariant");
2395 assert(promoted_flags != NULL, "invariant");
2396
2397 ResourceMark rm(THREAD);
2398 // Parse fixed parts:
2399 // access_flags, name_index, descriptor_index, attributes_count
2400 cfs->guarantee_more(8, CHECK_NULL);
2401
2402 int flags = cfs->get_u2_fast();
2403 const u2 name_index = cfs->get_u2_fast();
2404 const int cp_size = cp->length();
2405 check_property(
2406 valid_symbol_at(name_index),
2407 "Illegal constant pool index %u for method name in class file %s",
2408 name_index, CHECK_NULL);
2409 const Symbol* const name = cp->symbol_at(name_index);
2410 verify_legal_method_name(name, CHECK_NULL);
2411
2412 const u2 signature_index = cfs->get_u2_fast();
2413 guarantee_property(
2414 valid_symbol_at(signature_index),
2415 "Illegal constant pool index %u for method signature in class file %s",
2416 signature_index, CHECK_NULL);
2417 const Symbol* const signature = cp->symbol_at(signature_index);
2418
2419 if (name == vmSymbols::class_initializer_name()) {
2420 // We ignore the other access flags for a valid class initializer.
2421 // (JVM Spec 2nd ed., chapter 4.6)
2422 if (_major_version < 51) { // backward compatibility
2423 flags = JVM_ACC_STATIC;
2424 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2425 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2426 } else {
2427 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2428 }
2429 } else {
2430 verify_legal_method_modifiers(flags, is_interface, is_value_type, name, CHECK_NULL);
2431 }
2432
2433 if (name == vmSymbols::object_initializer_name()) {
2434 if (is_interface) {
2435 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2436 /* TBD: uncomment when javac stops generating <init>() for value types.
2437 } else if (is_value_type) {
2438 classfile_parse_error("Value Type cannot have a method named <init>, class file %s", CHECK_NULL);
2439 */
2440 }
2441 }
2442
2443 int args_size = -1; // only used when _need_verify is true
2444 if (_need_verify) {
2445 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2446 verify_legal_method_signature(name, signature, CHECK_NULL);
2447 if (args_size > MAX_ARGS_SIZE) {
2448 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2449 }
2450 }
2451
2452 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2453
2454 // Default values for code and exceptions attribute elements
2455 u2 max_stack = 0;
2456 u2 max_locals = 0;
2457 u4 code_length = 0;
2458 const u1* code_start = 0;
2459 u2 exception_table_length = 0;
2460 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2461 Array<int>* exception_handlers = Universe::the_empty_int_array();
2462 u2 checked_exceptions_length = 0;
2463 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2464 CompressedLineNumberWriteStream* linenumber_table = NULL;
2465 int linenumber_table_length = 0;
2466 int total_lvt_length = 0;
2467 u2 lvt_cnt = 0;
2468 u2 lvtt_cnt = 0;
2469 bool lvt_allocated = false;
2470 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2471 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2472 u2* localvariable_table_length = NULL;
2473 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2474 u2* localvariable_type_table_length = NULL;
2475 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2476 int method_parameters_length = -1;
2477 const u1* method_parameters_data = NULL;
2478 bool method_parameters_seen = false;
2479 bool parsed_code_attribute = false;
2480 bool parsed_checked_exceptions_attribute = false;
2481 bool parsed_stackmap_attribute = false;
2482 // stackmap attribute - JDK1.5
2483 const u1* stackmap_data = NULL;
2484 int stackmap_data_length = 0;
2485 u2 generic_signature_index = 0;
2486 MethodAnnotationCollector parsed_annotations;
2487 const u1* runtime_visible_annotations = NULL;
2488 int runtime_visible_annotations_length = 0;
2489 const u1* runtime_invisible_annotations = NULL;
2490 int runtime_invisible_annotations_length = 0;
2491 const u1* runtime_visible_parameter_annotations = NULL;
2492 int runtime_visible_parameter_annotations_length = 0;
2493 const u1* runtime_invisible_parameter_annotations = NULL;
2494 int runtime_invisible_parameter_annotations_length = 0;
2495 const u1* runtime_visible_type_annotations = NULL;
2496 int runtime_visible_type_annotations_length = 0;
2497 const u1* runtime_invisible_type_annotations = NULL;
2498 int runtime_invisible_type_annotations_length = 0;
2499 bool runtime_invisible_annotations_exists = false;
2500 bool runtime_invisible_type_annotations_exists = false;
2501 bool runtime_invisible_parameter_annotations_exists = false;
2502 const u1* annotation_default = NULL;
2503 int annotation_default_length = 0;
2504
2505 // Parse code and exceptions attribute
2506 u2 method_attributes_count = cfs->get_u2_fast();
2507 while (method_attributes_count--) {
2508 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2509 const u2 method_attribute_name_index = cfs->get_u2_fast();
2510 const u4 method_attribute_length = cfs->get_u4_fast();
2511 check_property(
2512 valid_symbol_at(method_attribute_name_index),
2513 "Invalid method attribute name index %u in class file %s",
2514 method_attribute_name_index, CHECK_NULL);
2515
2516 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2517 if (method_attribute_name == vmSymbols::tag_code()) {
2518 // Parse Code attribute
2519 if (_need_verify) {
2520 guarantee_property(
2521 !access_flags.is_native() && !access_flags.is_abstract(),
2522 "Code attribute in native or abstract methods in class file %s",
2523 CHECK_NULL);
2524 }
2525 if (parsed_code_attribute) {
2526 classfile_parse_error("Multiple Code attributes in class file %s",
2527 CHECK_NULL);
2528 }
2529 parsed_code_attribute = true;
2530
2531 // Stack size, locals size, and code size
2532 if (_major_version == 45 && _minor_version <= 2) {
2533 cfs->guarantee_more(4, CHECK_NULL);
2534 max_stack = cfs->get_u1_fast();
2535 max_locals = cfs->get_u1_fast();
2536 code_length = cfs->get_u2_fast();
2537 } else {
2538 cfs->guarantee_more(8, CHECK_NULL);
2539 max_stack = cfs->get_u2_fast();
2540 max_locals = cfs->get_u2_fast();
2541 code_length = cfs->get_u4_fast();
2542 }
2543 if (_need_verify) {
2544 guarantee_property(args_size <= max_locals,
2545 "Arguments can't fit into locals in class file %s",
2546 CHECK_NULL);
2547 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2548 "Invalid method Code length %u in class file %s",
2549 code_length, CHECK_NULL);
2550 }
2551 // Code pointer
2552 code_start = cfs->current();
2553 assert(code_start != NULL, "null code start");
2554 cfs->guarantee_more(code_length, CHECK_NULL);
2555 cfs->skip_u1_fast(code_length);
2556
2557 // Exception handler table
2558 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2559 exception_table_length = cfs->get_u2_fast();
2560 if (exception_table_length > 0) {
2561 exception_table_start = parse_exception_table(cfs,
2562 code_length,
2563 exception_table_length,
2564 CHECK_NULL);
2565 }
2566
2567 // Parse additional attributes in code attribute
2568 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2569 u2 code_attributes_count = cfs->get_u2_fast();
2570
2571 unsigned int calculated_attribute_length = 0;
2572
2573 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2574 calculated_attribute_length =
2575 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2576 } else {
2577 // max_stack, locals and length are smaller in pre-version 45.2 classes
2578 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2579 }
2580 calculated_attribute_length +=
2581 code_length +
2582 sizeof(exception_table_length) +
2583 sizeof(code_attributes_count) +
2584 exception_table_length *
2585 ( sizeof(u2) + // start_pc
2586 sizeof(u2) + // end_pc
2587 sizeof(u2) + // handler_pc
2588 sizeof(u2) ); // catch_type_index
2589
2590 while (code_attributes_count--) {
2591 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2592 const u2 code_attribute_name_index = cfs->get_u2_fast();
2593 const u4 code_attribute_length = cfs->get_u4_fast();
2594 calculated_attribute_length += code_attribute_length +
2595 sizeof(code_attribute_name_index) +
2596 sizeof(code_attribute_length);
2597 check_property(valid_symbol_at(code_attribute_name_index),
2598 "Invalid code attribute name index %u in class file %s",
2599 code_attribute_name_index,
2600 CHECK_NULL);
2601 if (LoadLineNumberTables &&
2602 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2603 // Parse and compress line number table
2604 parse_linenumber_table(code_attribute_length,
2605 code_length,
2606 &linenumber_table,
2607 CHECK_NULL);
2608
2609 } else if (LoadLocalVariableTables &&
2610 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2611 // Parse local variable table
2612 if (!lvt_allocated) {
2613 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2614 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2615 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2616 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2617 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2618 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2619 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2620 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2621 lvt_allocated = true;
2622 }
2623 if (lvt_cnt == max_lvt_cnt) {
2624 max_lvt_cnt <<= 1;
2625 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2626 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2627 }
2628 localvariable_table_start[lvt_cnt] =
2629 parse_localvariable_table(cfs,
2630 code_length,
2631 max_locals,
2632 code_attribute_length,
2633 &localvariable_table_length[lvt_cnt],
2634 false, // is not LVTT
2635 CHECK_NULL);
2636 total_lvt_length += localvariable_table_length[lvt_cnt];
2637 lvt_cnt++;
2638 } else if (LoadLocalVariableTypeTables &&
2639 _major_version >= JAVA_1_5_VERSION &&
2640 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2641 if (!lvt_allocated) {
2642 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2643 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2644 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2645 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2646 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2647 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2648 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2649 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2650 lvt_allocated = true;
2651 }
2652 // Parse local variable type table
2653 if (lvtt_cnt == max_lvtt_cnt) {
2654 max_lvtt_cnt <<= 1;
2655 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2656 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2657 }
2658 localvariable_type_table_start[lvtt_cnt] =
2659 parse_localvariable_table(cfs,
2660 code_length,
2661 max_locals,
2662 code_attribute_length,
2663 &localvariable_type_table_length[lvtt_cnt],
2664 true, // is LVTT
2665 CHECK_NULL);
2666 lvtt_cnt++;
2667 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2668 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2669 // Stack map is only needed by the new verifier in JDK1.5.
2670 if (parsed_stackmap_attribute) {
2671 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2672 }
2673 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2674 stackmap_data_length = code_attribute_length;
2675 parsed_stackmap_attribute = true;
2676 } else {
2677 // Skip unknown attributes
2678 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2679 }
2680 }
2681 // check method attribute length
2682 if (_need_verify) {
2683 guarantee_property(method_attribute_length == calculated_attribute_length,
2684 "Code segment has wrong length in class file %s",
2685 CHECK_NULL);
2686 }
2687 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2688 // Parse Exceptions attribute
2689 if (parsed_checked_exceptions_attribute) {
2690 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2691 CHECK_NULL);
2692 }
2693 parsed_checked_exceptions_attribute = true;
2694 checked_exceptions_start =
2695 parse_checked_exceptions(cfs,
2696 &checked_exceptions_length,
2697 method_attribute_length,
2698 CHECK_NULL);
2699 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2700 // reject multiple method parameters
2701 if (method_parameters_seen) {
2702 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2703 CHECK_NULL);
2704 }
2705 method_parameters_seen = true;
2706 method_parameters_length = cfs->get_u1_fast();
2707 const u2 real_length = (method_parameters_length * 4u) + 1u;
2708 if (method_attribute_length != real_length) {
2709 classfile_parse_error(
2710 "Invalid MethodParameters method attribute length %u in class file",
2711 method_attribute_length, CHECK_NULL);
2712 }
2713 method_parameters_data = cfs->current();
2714 cfs->skip_u2_fast(method_parameters_length);
2715 cfs->skip_u2_fast(method_parameters_length);
2716 // ignore this attribute if it cannot be reflected
2717 if (!SystemDictionary::Parameter_klass_loaded())
2718 method_parameters_length = -1;
2719 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2720 if (method_attribute_length != 0) {
2721 classfile_parse_error(
2722 "Invalid Synthetic method attribute length %u in class file %s",
2723 method_attribute_length, CHECK_NULL);
2724 }
2725 // Should we check that there hasn't already been a synthetic attribute?
2726 access_flags.set_is_synthetic();
2727 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2728 if (method_attribute_length != 0) {
2729 classfile_parse_error(
2730 "Invalid Deprecated method attribute length %u in class file %s",
2731 method_attribute_length, CHECK_NULL);
2732 }
2733 } else if (_major_version >= JAVA_1_5_VERSION) {
2734 if (method_attribute_name == vmSymbols::tag_signature()) {
2735 if (generic_signature_index != 0) {
2736 classfile_parse_error(
2737 "Multiple Signature attributes for method in class file %s",
2738 CHECK_NULL);
2739 }
2740 if (method_attribute_length != 2) {
2741 classfile_parse_error(
2742 "Invalid Signature attribute length %u in class file %s",
2743 method_attribute_length, CHECK_NULL);
2744 }
2745 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2746 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2747 if (runtime_visible_annotations != NULL) {
2748 classfile_parse_error(
2749 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2750 CHECK_NULL);
2751 }
2752 runtime_visible_annotations_length = method_attribute_length;
2753 runtime_visible_annotations = cfs->current();
2754 assert(runtime_visible_annotations != NULL, "null visible annotations");
2755 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2756 parse_annotations(cp,
2757 runtime_visible_annotations,
2758 runtime_visible_annotations_length,
2759 &parsed_annotations,
2760 _loader_data,
2761 CHECK_NULL);
2762 cfs->skip_u1_fast(runtime_visible_annotations_length);
2763 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2764 if (runtime_invisible_annotations_exists) {
2765 classfile_parse_error(
2766 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2767 CHECK_NULL);
2768 }
2769 runtime_invisible_annotations_exists = true;
2770 if (PreserveAllAnnotations) {
2771 runtime_invisible_annotations_length = method_attribute_length;
2772 runtime_invisible_annotations = cfs->current();
2773 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2774 }
2775 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2776 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2777 if (runtime_visible_parameter_annotations != NULL) {
2778 classfile_parse_error(
2779 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2780 CHECK_NULL);
2781 }
2782 runtime_visible_parameter_annotations_length = method_attribute_length;
2783 runtime_visible_parameter_annotations = cfs->current();
2784 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2785 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2786 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2787 if (runtime_invisible_parameter_annotations_exists) {
2788 classfile_parse_error(
2789 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2790 CHECK_NULL);
2791 }
2792 runtime_invisible_parameter_annotations_exists = true;
2793 if (PreserveAllAnnotations) {
2794 runtime_invisible_parameter_annotations_length = method_attribute_length;
2795 runtime_invisible_parameter_annotations = cfs->current();
2796 assert(runtime_invisible_parameter_annotations != NULL,
2797 "null invisible parameter annotations");
2798 }
2799 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2800 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2801 if (annotation_default != NULL) {
2802 classfile_parse_error(
2803 "Multiple AnnotationDefault attributes for method in class file %s",
2804 CHECK_NULL);
2805 }
2806 annotation_default_length = method_attribute_length;
2807 annotation_default = cfs->current();
2808 assert(annotation_default != NULL, "null annotation default");
2809 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2810 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2811 if (runtime_visible_type_annotations != NULL) {
2812 classfile_parse_error(
2813 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2814 CHECK_NULL);
2815 }
2816 runtime_visible_type_annotations_length = method_attribute_length;
2817 runtime_visible_type_annotations = cfs->current();
2818 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2819 // No need for the VM to parse Type annotations
2820 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2821 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2822 if (runtime_invisible_type_annotations_exists) {
2823 classfile_parse_error(
2824 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2825 CHECK_NULL);
2826 } else {
2827 runtime_invisible_type_annotations_exists = true;
2828 }
2829 if (PreserveAllAnnotations) {
2830 runtime_invisible_type_annotations_length = method_attribute_length;
2831 runtime_invisible_type_annotations = cfs->current();
2832 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2833 }
2834 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2835 } else {
2836 // Skip unknown attributes
2837 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2838 }
2839 } else {
2840 // Skip unknown attributes
2841 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2842 }
2843 }
2844
2845 if (linenumber_table != NULL) {
2846 linenumber_table->write_terminator();
2847 linenumber_table_length = linenumber_table->position();
2848 }
2849
2850 // Make sure there's at least one Code attribute in non-native/non-abstract method
2851 if (_need_verify) {
2852 guarantee_property(access_flags.is_native() ||
2853 access_flags.is_abstract() ||
2854 parsed_code_attribute,
2855 "Absent Code attribute in method that is not native or abstract in class file %s",
2856 CHECK_NULL);
2857 }
2858
2859 // All sizing information for a Method* is finally available, now create it
2860 InlineTableSizes sizes(
2861 total_lvt_length,
2862 linenumber_table_length,
2863 exception_table_length,
2864 checked_exceptions_length,
2865 method_parameters_length,
2866 generic_signature_index,
2867 runtime_visible_annotations_length +
2868 runtime_invisible_annotations_length,
2869 runtime_visible_parameter_annotations_length +
2870 runtime_invisible_parameter_annotations_length,
2871 runtime_visible_type_annotations_length +
2872 runtime_invisible_type_annotations_length,
2873 annotation_default_length,
2874 0);
2875
2876 Method* const m = Method::allocate(_loader_data,
2877 code_length,
2878 access_flags,
2879 &sizes,
2880 ConstMethod::NORMAL,
2881 CHECK_NULL);
2882
2883 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2884
2885 // Fill in information from fixed part (access_flags already set)
2886 m->set_constants(_cp);
2887 m->set_name_index(name_index);
2888 m->set_signature_index(signature_index);
2889
2890 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2891 m->constMethod()->set_result_type(rtf.type());
2892
2893 if (args_size >= 0) {
2894 m->set_size_of_parameters(args_size);
2895 } else {
2896 m->compute_size_of_parameters(THREAD);
2897 }
2898 #ifdef ASSERT
2899 if (args_size >= 0) {
2900 m->compute_size_of_parameters(THREAD);
2901 assert(args_size == m->size_of_parameters(), "");
2902 }
2903 #endif
2904
2905 // Fill in code attribute information
2906 m->set_max_stack(max_stack);
2907 m->set_max_locals(max_locals);
2908 if (stackmap_data != NULL) {
2909 m->constMethod()->copy_stackmap_data(_loader_data,
2910 (u1*)stackmap_data,
2911 stackmap_data_length,
2912 CHECK_NULL);
2913 }
2914
2915 // Copy byte codes
2916 m->set_code((u1*)code_start);
2917
2918 // Copy line number table
2919 if (linenumber_table != NULL) {
2920 memcpy(m->compressed_linenumber_table(),
2921 linenumber_table->buffer(),
2922 linenumber_table_length);
2923 }
2924
2925 // Copy exception table
2926 if (exception_table_length > 0) {
2927 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2928 m->exception_table_start(),
2929 exception_table_length * sizeof(ExceptionTableElement),
2930 sizeof(u2));
2931 }
2932
2933 // Copy method parameters
2934 if (method_parameters_length > 0) {
2935 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2936 for (int i = 0; i < method_parameters_length; i++) {
2937 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2938 method_parameters_data += 2;
2939 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2940 method_parameters_data += 2;
2941 }
2942 }
2943
2944 // Copy checked exceptions
2945 if (checked_exceptions_length > 0) {
2946 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2947 m->checked_exceptions_start(),
2948 checked_exceptions_length * sizeof(CheckedExceptionElement),
2949 sizeof(u2));
2950 }
2951
2952 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2953 if (total_lvt_length > 0) {
2954 promoted_flags->set_has_localvariable_table();
2955 copy_localvariable_table(m->constMethod(),
2956 lvt_cnt,
2957 localvariable_table_length,
2958 localvariable_table_start,
2959 lvtt_cnt,
2960 localvariable_type_table_length,
2961 localvariable_type_table_start,
2962 CHECK_NULL);
2963 }
2964
2965 if (parsed_annotations.has_any_annotations())
2966 parsed_annotations.apply_to(m);
2967
2968 // Copy annotations
2969 copy_method_annotations(m->constMethod(),
2970 runtime_visible_annotations,
2971 runtime_visible_annotations_length,
2972 runtime_invisible_annotations,
2973 runtime_invisible_annotations_length,
2974 runtime_visible_parameter_annotations,
2975 runtime_visible_parameter_annotations_length,
2976 runtime_invisible_parameter_annotations,
2977 runtime_invisible_parameter_annotations_length,
2978 runtime_visible_type_annotations,
2979 runtime_visible_type_annotations_length,
2980 runtime_invisible_type_annotations,
2981 runtime_invisible_type_annotations_length,
2982 annotation_default,
2983 annotation_default_length,
2984 CHECK_NULL);
2985
2986 if (name == vmSymbols::finalize_method_name() &&
2987 signature == vmSymbols::void_method_signature()) {
2988 if (m->is_empty_method()) {
2989 _has_empty_finalizer = true;
2990 } else {
2991 _has_finalizer = true;
2992 }
2993 }
2994 if (name == vmSymbols::object_initializer_name() &&
2995 signature == vmSymbols::void_method_signature() &&
2996 m->is_vanilla_constructor()) {
2997 _has_vanilla_constructor = true;
2998 }
2999
3000 NOT_PRODUCT(m->verify());
3001 return m;
3002 }
3003
3004
3005 // The promoted_flags parameter is used to pass relevant access_flags
3006 // from the methods back up to the containing klass. These flag values
3007 // are added to klass's access_flags.
3008 // Side-effects: populates the _methods field in the parser
3009 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
3010 bool is_interface,
3011 bool is_value_type,
3012 AccessFlags* promoted_flags,
3013 bool* has_final_method,
3014 bool* declares_nonstatic_concrete_methods,
3015 TRAPS) {
3016 assert(cfs != NULL, "invariant");
3017 assert(promoted_flags != NULL, "invariant");
3018 assert(has_final_method != NULL, "invariant");
3019 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
3020
3021 assert(NULL == _methods, "invariant");
3022
3023 cfs->guarantee_more(2, CHECK); // length
3024 const u2 length = cfs->get_u2_fast();
3025 if (length == 0) {
3026 _methods = Universe::the_empty_method_array();
3027 } else {
3028 _methods = MetadataFactory::new_array<Method*>(_loader_data,
3029 length,
3030 NULL,
3031 CHECK);
3032
3033 for (int index = 0; index < length; index++) {
3034 Method* method = parse_method(cfs,
3035 is_interface,
3036 is_value_type,
3037 _cp,
3038 promoted_flags,
3039 CHECK);
3040
3041 if (method->is_final()) {
3042 *has_final_method = true;
3043 }
3044 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
3045 // used for interface initialization, and default method inheritance analysis
3046 if (is_interface && !(*declares_nonstatic_concrete_methods)
3047 && !method->is_abstract() && !method->is_static()) {
3048 *declares_nonstatic_concrete_methods = true;
3049 }
3050 _methods->at_put(index, method);
3051 }
3052
3053 if (_need_verify && length > 1) {
3054 // Check duplicated methods
3055 ResourceMark rm(THREAD);
3056 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
3057 THREAD, NameSigHash*, HASH_ROW_SIZE);
3058 initialize_hashtable(names_and_sigs);
3059 bool dup = false;
3060 const Symbol* name = NULL;
3061 const Symbol* sig = NULL;
3062 {
3063 debug_only(NoSafepointVerifier nsv;)
3064 for (int i = 0; i < length; i++) {
3065 const Method* const m = _methods->at(i);
3066 name = m->name();
3067 sig = m->signature();
3068 // If no duplicates, add name/signature in hashtable names_and_sigs.
3069 if (!put_after_lookup(name, sig, names_and_sigs)) {
3070 dup = true;
3071 break;
3072 }
3073 }
3074 }
3075 if (dup) {
3076 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
3077 name->as_C_string(), sig->as_klass_external_name(), CHECK);
3078 }
3079 }
3080 }
3081 }
3082
3083 static const intArray* sort_methods(Array<Method*>* methods) {
3084 const int length = methods->length();
3085 // If JVMTI original method ordering or sharing is enabled we have to
3086 // remember the original class file ordering.
3087 // We temporarily use the vtable_index field in the Method* to store the
3088 // class file index, so we can read in after calling qsort.
3089 // Put the method ordering in the shared archive.
3090 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3091 for (int index = 0; index < length; index++) {
3092 Method* const m = methods->at(index);
3093 assert(!m->valid_vtable_index(), "vtable index should not be set");
3094 m->set_vtable_index(index);
3095 }
3096 }
3097 // Sort method array by ascending method name (for faster lookups & vtable construction)
3098 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3099 Method::sort_methods(methods);
3100
3101 intArray* method_ordering = NULL;
3102 // If JVMTI original method ordering or sharing is enabled construct int
3103 // array remembering the original ordering
3104 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3105 method_ordering = new intArray(length, length, -1);
3106 for (int index = 0; index < length; index++) {
3107 Method* const m = methods->at(index);
3108 const int old_index = m->vtable_index();
3109 assert(old_index >= 0 && old_index < length, "invalid method index");
3110 method_ordering->at_put(index, old_index);
3111 m->set_vtable_index(Method::invalid_vtable_index);
3112 }
3113 }
3114 return method_ordering;
3115 }
3116
3117 // Parse generic_signature attribute for methods and fields
3118 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3119 TRAPS) {
3120 assert(cfs != NULL, "invariant");
3121
3122 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3123 const u2 generic_signature_index = cfs->get_u2_fast();
3124 check_property(
3125 valid_symbol_at(generic_signature_index),
3126 "Invalid Signature attribute at constant pool index %u in class file %s",
3127 generic_signature_index, CHECK_0);
3128 return generic_signature_index;
3129 }
3130
3131 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3132 TRAPS) {
3133
3134 assert(cfs != NULL, "invariant");
3135
3136 cfs->guarantee_more(2, CHECK); // sourcefile_index
3137 const u2 sourcefile_index = cfs->get_u2_fast();
3138 check_property(
3139 valid_symbol_at(sourcefile_index),
3140 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3141 sourcefile_index, CHECK);
3142 set_class_sourcefile_index(sourcefile_index);
3143 }
3144
3145 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3146 int length,
3147 TRAPS) {
3148 assert(cfs != NULL, "invariant");
3149
3150 const u1* const sde_buffer = cfs->current();
3151 assert(sde_buffer != NULL, "null sde buffer");
3152
3153 // Don't bother storing it if there is no way to retrieve it
3154 if (JvmtiExport::can_get_source_debug_extension()) {
3155 assert((length+1) > length, "Overflow checking");
3156 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3157 for (int i = 0; i < length; i++) {
3158 sde[i] = sde_buffer[i];
3159 }
3160 sde[length] = '\0';
3161 set_class_sde_buffer((const char*)sde, length);
3162 }
3163 // Got utf8 string, set stream position forward
3164 cfs->skip_u1(length, CHECK);
3165 }
3166
3167
3168 // Inner classes can be static, private or protected (classic VM does this)
3169 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3170 JVM_ACC_PRIVATE | \
3171 JVM_ACC_PROTECTED | \
3172 JVM_ACC_STATIC \
3173 )
3174
3175 u2 ClassFileParser::parse_value_types_attribute(const ClassFileStream* const cfs,
3176 const u1* const value_types_attribute_start,
3177 TRAPS) {
3178 const u1* const current_mark = cfs->current();
3179 u2 length = 0;
3180 if (value_types_attribute_start != NULL) {
3181 cfs->set_current(value_types_attribute_start);
3182 cfs->guarantee_more(2, CHECK_0); // length
3183 length = cfs->get_u2_fast();
3184 }
3185 Array<ValueTypes>* const value_types = MetadataFactory::new_array<ValueTypes>(_loader_data, length, CHECK_0);
3186
3187 int index = 0;
3188 const int cp_size = _cp->length();
3189 cfs->guarantee_more(2 *length, CHECK_0);
3190 for (int n = 0; n < length; n++) {
3191 // Value types class index
3192 const u2 value_types_info_index = cfs->get_u2_fast();
3193 check_property(
3194 valid_klass_reference_at(value_types_info_index),
3195 "value_types_info_index %u has bad constant type in class file %s",
3196 value_types_info_index, CHECK_0);
3197 ValueTypes vt;
3198 vt._class_info_index = value_types_info_index;
3199 vt._class_name = NULL;
3200 value_types->at_put(index++, vt);
3201 }
3202 _value_types = value_types;
3203 // Restore buffer's current position.
3204 cfs->set_current(current_mark);
3205
3206 return length;
3207 }
3208
3209 // Return number of classes in the inner classes attribute table
3210 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3211 const u1* const inner_classes_attribute_start,
3212 bool parsed_enclosingmethod_attribute,
3213 u2 enclosing_method_class_index,
3214 u2 enclosing_method_method_index,
3215 TRAPS) {
3216 const u1* const current_mark = cfs->current();
3217 u2 length = 0;
3218 if (inner_classes_attribute_start != NULL) {
3219 cfs->set_current(inner_classes_attribute_start);
3220 cfs->guarantee_more(2, CHECK_0); // length
3221 length = cfs->get_u2_fast();
3222 }
3223
3224 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3225 // method data:
3226 // [inner_class_info_index,
3227 // outer_class_info_index,
3228 // inner_name_index,
3229 // inner_class_access_flags,
3230 // ...
3231 // enclosing_method_class_index,
3232 // enclosing_method_method_index]
3233 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3234 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3235 _inner_classes = inner_classes;
3236
3237 int index = 0;
3238 const int cp_size = _cp->length();
3239 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3240 for (int n = 0; n < length; n++) {
3241 // Inner class index
3242 const u2 inner_class_info_index = cfs->get_u2_fast();
3243 check_property(
3244 valid_klass_reference_at(inner_class_info_index),
3245 "inner_class_info_index %u has bad constant type in class file %s",
3246 inner_class_info_index, CHECK_0);
3247 // Outer class index
3248 const u2 outer_class_info_index = cfs->get_u2_fast();
3249 check_property(
3250 outer_class_info_index == 0 ||
3251 valid_klass_reference_at(outer_class_info_index),
3252 "outer_class_info_index %u has bad constant type in class file %s",
3253 outer_class_info_index, CHECK_0);
3254 // Inner class name
3255 const u2 inner_name_index = cfs->get_u2_fast();
3256 check_property(
3257 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3258 "inner_name_index %u has bad constant type in class file %s",
3259 inner_name_index, CHECK_0);
3260 if (_need_verify) {
3261 guarantee_property(inner_class_info_index != outer_class_info_index,
3262 "Class is both outer and inner class in class file %s", CHECK_0);
3263 }
3264
3265 jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3266 // JVM_ACC_MODULE is defined in JDK-9 and later.
3267 if (_major_version >= JAVA_9_VERSION) {
3268 recognized_modifiers |= JVM_ACC_MODULE;
3269 }
3270 // JVM_ACC_VALUE is defined for class file version 55 and later
3271 if (supports_value_types()) {
3272 recognized_modifiers |= JVM_ACC_VALUE;
3273 }
3274
3275 // Access flags
3276 jint flags = cfs->get_u2_fast() & recognized_modifiers;
3277
3278 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3279 // Set abstract bit for old class files for backward compatibility
3280 flags |= JVM_ACC_ABSTRACT;
3281 }
3282 verify_legal_class_modifiers(flags, CHECK_0);
3283 AccessFlags inner_access_flags(flags);
3284
3285 inner_classes->at_put(index++, inner_class_info_index);
3286 inner_classes->at_put(index++, outer_class_info_index);
3287 inner_classes->at_put(index++, inner_name_index);
3288 inner_classes->at_put(index++, inner_access_flags.as_short());
3289 }
3290
3291 // 4347400: make sure there's no duplicate entry in the classes array
3292 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3293 for(int i = 0; i < length * 4; i += 4) {
3294 for(int j = i + 4; j < length * 4; j += 4) {
3295 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3296 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3297 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3298 inner_classes->at(i+3) != inner_classes->at(j+3)),
3299 "Duplicate entry in InnerClasses in class file %s",
3300 CHECK_0);
3301 }
3302 }
3303 }
3304
3305 // Set EnclosingMethod class and method indexes.
3306 if (parsed_enclosingmethod_attribute) {
3307 inner_classes->at_put(index++, enclosing_method_class_index);
3308 inner_classes->at_put(index++, enclosing_method_method_index);
3309 }
3310 assert(index == size, "wrong size");
3311
3312 // Restore buffer's current position.
3313 cfs->set_current(current_mark);
3314
3315 return length;
3316 }
3317
3318 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3319 set_class_synthetic_flag(true);
3320 }
3321
3322 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3323 assert(cfs != NULL, "invariant");
3324
3325 const u2 signature_index = cfs->get_u2(CHECK);
3326 check_property(
3327 valid_symbol_at(signature_index),
3328 "Invalid constant pool index %u in Signature attribute in class file %s",
3329 signature_index, CHECK);
3330 set_class_generic_signature_index(signature_index);
3331 }
3332
3333 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3334 ConstantPool* cp,
3335 u4 attribute_byte_length,
3336 TRAPS) {
3337 assert(cfs != NULL, "invariant");
3338 assert(cp != NULL, "invariant");
3339
3340 const u1* const current_start = cfs->current();
3341
3342 guarantee_property(attribute_byte_length >= sizeof(u2),
3343 "Invalid BootstrapMethods attribute length %u in class file %s",
3344 attribute_byte_length,
3345 CHECK);
3346
3347 cfs->guarantee_more(attribute_byte_length, CHECK);
3348
3349 const int attribute_array_length = cfs->get_u2_fast();
3350
3351 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3352 "Short length on BootstrapMethods in class file %s",
3353 CHECK);
3354
3355
3356 // The attribute contains a counted array of counted tuples of shorts,
3357 // represending bootstrap specifiers:
3358 // length*{bootstrap_method_index, argument_count*{argument_index}}
3359 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3360 // operand_count = number of shorts in attr, except for leading length
3361
3362 // The attribute is copied into a short[] array.
3363 // The array begins with a series of short[2] pairs, one for each tuple.
3364 const int index_size = (attribute_array_length * 2);
3365
3366 Array<u2>* const operands =
3367 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3368
3369 // Eagerly assign operands so they will be deallocated with the constant
3370 // pool if there is an error.
3371 cp->set_operands(operands);
3372
3373 int operand_fill_index = index_size;
3374 const int cp_size = cp->length();
3375
3376 for (int n = 0; n < attribute_array_length; n++) {
3377 // Store a 32-bit offset into the header of the operand array.
3378 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3379
3380 // Read a bootstrap specifier.
3381 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3382 const u2 bootstrap_method_index = cfs->get_u2_fast();
3383 const u2 argument_count = cfs->get_u2_fast();
3384 check_property(
3385 valid_cp_range(bootstrap_method_index, cp_size) &&
3386 cp->tag_at(bootstrap_method_index).is_method_handle(),
3387 "bootstrap_method_index %u has bad constant type in class file %s",
3388 bootstrap_method_index,
3389 CHECK);
3390
3391 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3392 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3393 CHECK);
3394
3395 operands->at_put(operand_fill_index++, bootstrap_method_index);
3396 operands->at_put(operand_fill_index++, argument_count);
3397
3398 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3399 for (int j = 0; j < argument_count; j++) {
3400 const u2 argument_index = cfs->get_u2_fast();
3401 check_property(
3402 valid_cp_range(argument_index, cp_size) &&
3403 cp->tag_at(argument_index).is_loadable_constant(),
3404 "argument_index %u has bad constant type in class file %s",
3405 argument_index,
3406 CHECK);
3407 operands->at_put(operand_fill_index++, argument_index);
3408 }
3409 }
3410 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3411 "Bad length on BootstrapMethods in class file %s",
3412 CHECK);
3413 }
3414
3415 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3416 ConstantPool* cp,
3417 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3418 TRAPS) {
3419 assert(cfs != NULL, "invariant");
3420 assert(cp != NULL, "invariant");
3421 assert(parsed_annotations != NULL, "invariant");
3422
3423 // Set inner classes attribute to default sentinel
3424 _inner_classes = Universe::the_empty_short_array();
3425 cfs->guarantee_more(2, CHECK); // attributes_count
3426 u2 attributes_count = cfs->get_u2_fast();
3427 bool parsed_sourcefile_attribute = false;
3428 bool parsed_innerclasses_attribute = false;
3429 bool parsed_value_types_attribute = false;
3430 bool parsed_enclosingmethod_attribute = false;
3431 bool parsed_bootstrap_methods_attribute = false;
3432 const u1* runtime_visible_annotations = NULL;
3433 int runtime_visible_annotations_length = 0;
3434 const u1* runtime_invisible_annotations = NULL;
3435 int runtime_invisible_annotations_length = 0;
3436 const u1* runtime_visible_type_annotations = NULL;
3437 int runtime_visible_type_annotations_length = 0;
3438 const u1* runtime_invisible_type_annotations = NULL;
3439 int runtime_invisible_type_annotations_length = 0;
3440 bool runtime_invisible_type_annotations_exists = false;
3441 bool runtime_invisible_annotations_exists = false;
3442 bool parsed_source_debug_ext_annotations_exist = false;
3443 const u1* inner_classes_attribute_start = NULL;
3444 u4 inner_classes_attribute_length = 0;
3445 const u1* value_types_attribute_start = NULL;
3446 u4 value_types_attribute_length = 0;
3447 u2 enclosing_method_class_index = 0;
3448 u2 enclosing_method_method_index = 0;
3449 // Iterate over attributes
3450 while (attributes_count--) {
3451 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3452 const u2 attribute_name_index = cfs->get_u2_fast();
3453 const u4 attribute_length = cfs->get_u4_fast();
3454 check_property(
3455 valid_symbol_at(attribute_name_index),
3456 "Attribute name has bad constant pool index %u in class file %s",
3457 attribute_name_index, CHECK);
3458 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3459 if (tag == vmSymbols::tag_source_file()) {
3460 // Check for SourceFile tag
3461 if (_need_verify) {
3462 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3463 }
3464 if (parsed_sourcefile_attribute) {
3465 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3466 } else {
3467 parsed_sourcefile_attribute = true;
3468 }
3469 parse_classfile_sourcefile_attribute(cfs, CHECK);
3470 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3471 // Check for SourceDebugExtension tag
3472 if (parsed_source_debug_ext_annotations_exist) {
3473 classfile_parse_error(
3474 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3475 }
3476 parsed_source_debug_ext_annotations_exist = true;
3477 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3478 } else if (tag == vmSymbols::tag_inner_classes()) {
3479 // Check for InnerClasses tag
3480 if (parsed_innerclasses_attribute) {
3481 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3482 } else {
3483 parsed_innerclasses_attribute = true;
3484 }
3485 inner_classes_attribute_start = cfs->current();
3486 inner_classes_attribute_length = attribute_length;
3487 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3488 } else if (tag == vmSymbols::tag_value_types()) {
3489 // Check for ValueTypes tag
3490 if (parsed_value_types_attribute) {
3491 classfile_parse_error("Multiple ValueTypes attributes in class file %s", CHECK);
3492 } else {
3493 parsed_value_types_attribute = true;
3494 }
3495 value_types_attribute_start = cfs->current();
3496 value_types_attribute_length = attribute_length;
3497 cfs->skip_u1(value_types_attribute_length, CHECK);
3498 } else if (tag == vmSymbols::tag_synthetic()) {
3499 // Check for Synthetic tag
3500 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3501 if (attribute_length != 0) {
3502 classfile_parse_error(
3503 "Invalid Synthetic classfile attribute length %u in class file %s",
3504 attribute_length, CHECK);
3505 }
3506 parse_classfile_synthetic_attribute(CHECK);
3507 } else if (tag == vmSymbols::tag_deprecated()) {
3508 // Check for Deprecatd tag - 4276120
3509 if (attribute_length != 0) {
3510 classfile_parse_error(
3511 "Invalid Deprecated classfile attribute length %u in class file %s",
3512 attribute_length, CHECK);
3513 }
3514 } else if (_major_version >= JAVA_1_5_VERSION) {
3515 if (tag == vmSymbols::tag_signature()) {
3516 if (_generic_signature_index != 0) {
3517 classfile_parse_error(
3518 "Multiple Signature attributes in class file %s", CHECK);
3519 }
3520 if (attribute_length != 2) {
3521 classfile_parse_error(
3522 "Wrong Signature attribute length %u in class file %s",
3523 attribute_length, CHECK);
3524 }
3525 parse_classfile_signature_attribute(cfs, CHECK);
3526 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3527 if (runtime_visible_annotations != NULL) {
3528 classfile_parse_error(
3529 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3530 }
3531 runtime_visible_annotations_length = attribute_length;
3532 runtime_visible_annotations = cfs->current();
3533 assert(runtime_visible_annotations != NULL, "null visible annotations");
3534 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3535 parse_annotations(cp,
3536 runtime_visible_annotations,
3537 runtime_visible_annotations_length,
3538 parsed_annotations,
3539 _loader_data,
3540 CHECK);
3541 cfs->skip_u1_fast(runtime_visible_annotations_length);
3542 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3543 if (runtime_invisible_annotations_exists) {
3544 classfile_parse_error(
3545 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3546 }
3547 runtime_invisible_annotations_exists = true;
3548 if (PreserveAllAnnotations) {
3549 runtime_invisible_annotations_length = attribute_length;
3550 runtime_invisible_annotations = cfs->current();
3551 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3552 }
3553 cfs->skip_u1(attribute_length, CHECK);
3554 } else if (tag == vmSymbols::tag_enclosing_method()) {
3555 if (parsed_enclosingmethod_attribute) {
3556 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3557 } else {
3558 parsed_enclosingmethod_attribute = true;
3559 }
3560 guarantee_property(attribute_length == 4,
3561 "Wrong EnclosingMethod attribute length %u in class file %s",
3562 attribute_length, CHECK);
3563 cfs->guarantee_more(4, CHECK); // class_index, method_index
3564 enclosing_method_class_index = cfs->get_u2_fast();
3565 enclosing_method_method_index = cfs->get_u2_fast();
3566 if (enclosing_method_class_index == 0) {
3567 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3568 }
3569 // Validate the constant pool indices and types
3570 check_property(valid_klass_reference_at(enclosing_method_class_index),
3571 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3572 if (enclosing_method_method_index != 0 &&
3573 (!cp->is_within_bounds(enclosing_method_method_index) ||
3574 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3575 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3576 }
3577 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3578 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3579 if (parsed_bootstrap_methods_attribute) {
3580 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3581 }
3582 parsed_bootstrap_methods_attribute = true;
3583 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3584 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3585 if (runtime_visible_type_annotations != NULL) {
3586 classfile_parse_error(
3587 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3588 }
3589 runtime_visible_type_annotations_length = attribute_length;
3590 runtime_visible_type_annotations = cfs->current();
3591 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3592 // No need for the VM to parse Type annotations
3593 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3594 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3595 if (runtime_invisible_type_annotations_exists) {
3596 classfile_parse_error(
3597 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3598 } else {
3599 runtime_invisible_type_annotations_exists = true;
3600 }
3601 if (PreserveAllAnnotations) {
3602 runtime_invisible_type_annotations_length = attribute_length;
3603 runtime_invisible_type_annotations = cfs->current();
3604 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3605 }
3606 cfs->skip_u1(attribute_length, CHECK);
3607 } else {
3608 // Unknown attribute
3609 cfs->skip_u1(attribute_length, CHECK);
3610 }
3611 } else {
3612 // Unknown attribute
3613 cfs->skip_u1(attribute_length, CHECK);
3614 }
3615 }
3616 _annotations = assemble_annotations(runtime_visible_annotations,
3617 runtime_visible_annotations_length,
3618 runtime_invisible_annotations,
3619 runtime_invisible_annotations_length,
3620 CHECK);
3621 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3622 runtime_visible_type_annotations_length,
3623 runtime_invisible_type_annotations,
3624 runtime_invisible_type_annotations_length,
3625 CHECK);
3626
3627 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3628 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3629 cfs,
3630 inner_classes_attribute_start,
3631 parsed_innerclasses_attribute,
3632 enclosing_method_class_index,
3633 enclosing_method_method_index,
3634 CHECK);
3635 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3636 guarantee_property(
3637 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3638 "Wrong InnerClasses attribute length in class file %s", CHECK);
3639 }
3640 }
3641
3642 if (parsed_value_types_attribute) {
3643 parse_value_types_attribute(cfs, value_types_attribute_start, CHECK);
3644 }
3645
3646 if (_max_bootstrap_specifier_index >= 0) {
3647 guarantee_property(parsed_bootstrap_methods_attribute,
3648 "Missing BootstrapMethods attribute in class file %s", CHECK);
3649 }
3650 }
3651
3652 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3653 assert(k != NULL, "invariant");
3654
3655 if (_synthetic_flag)
3656 k->set_is_synthetic();
3657 if (_sourcefile_index != 0) {
3658 k->set_source_file_name_index(_sourcefile_index);
3659 }
3660 if (_generic_signature_index != 0) {
3661 k->set_generic_signature_index(_generic_signature_index);
3662 }
3663 if (_sde_buffer != NULL) {
3664 k->set_source_debug_extension(_sde_buffer, _sde_length);
3665 }
3666 }
3667
3668 // Create the Annotations object that will
3669 // hold the annotations array for the Klass.
3670 void ClassFileParser::create_combined_annotations(TRAPS) {
3671 if (_annotations == NULL &&
3672 _type_annotations == NULL &&
3673 _fields_annotations == NULL &&
3674 _fields_type_annotations == NULL) {
3675 // Don't create the Annotations object unnecessarily.
3676 return;
3677 }
3678
3679 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3680 annotations->set_class_annotations(_annotations);
3681 annotations->set_class_type_annotations(_type_annotations);
3682 annotations->set_fields_annotations(_fields_annotations);
3683 annotations->set_fields_type_annotations(_fields_type_annotations);
3684
3685 // This is the Annotations object that will be
3686 // assigned to InstanceKlass being constructed.
3687 _combined_annotations = annotations;
3688
3689 // The annotations arrays below has been transfered the
3690 // _combined_annotations so these fields can now be cleared.
3691 _annotations = NULL;
3692 _type_annotations = NULL;
3693 _fields_annotations = NULL;
3694 _fields_type_annotations = NULL;
3695 }
3696
3697 // Transfer ownership of metadata allocated to the InstanceKlass.
3698 void ClassFileParser::apply_parsed_class_metadata(
3699 InstanceKlass* this_klass,
3700 int java_fields_count, TRAPS) {
3701 assert(this_klass != NULL, "invariant");
3702
3703 _cp->set_pool_holder(this_klass);
3704 this_klass->set_constants(_cp);
3705 this_klass->set_fields(_fields, java_fields_count);
3706 this_klass->set_methods(_methods);
3707 this_klass->set_inner_classes(_inner_classes);
3708 this_klass->set_value_types(_value_types);
3709 this_klass->set_local_interfaces(_local_interfaces);
3710 this_klass->set_annotations(_combined_annotations);
3711 // Delay the setting of _transitive_interfaces until after initialize_supers() in
3712 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with
3713 // its _super. If an OOM occurs while loading the current klass, its _super field
3714 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3715 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3716 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3717
3718 // Clear out these fields so they don't get deallocated by the destructor
3719 clear_class_metadata();
3720 }
3721
3722 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3723 int runtime_visible_annotations_length,
3724 const u1* const runtime_invisible_annotations,
3725 int runtime_invisible_annotations_length,
3726 TRAPS) {
3727 AnnotationArray* annotations = NULL;
3728 if (runtime_visible_annotations != NULL ||
3729 runtime_invisible_annotations != NULL) {
3730 annotations = MetadataFactory::new_array<u1>(_loader_data,
3731 runtime_visible_annotations_length +
3732 runtime_invisible_annotations_length,
3733 CHECK_(annotations));
3734 if (runtime_visible_annotations != NULL) {
3735 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3736 annotations->at_put(i, runtime_visible_annotations[i]);
3737 }
3738 }
3739 if (runtime_invisible_annotations != NULL) {
3740 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3741 int append = runtime_visible_annotations_length+i;
3742 annotations->at_put(append, runtime_invisible_annotations[i]);
3743 }
3744 }
3745 }
3746 return annotations;
3747 }
3748
3749 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3750 const int super_class_index,
3751 const bool need_verify,
3752 TRAPS) {
3753 assert(cp != NULL, "invariant");
3754 const InstanceKlass* super_klass = NULL;
3755
3756 if (super_class_index == 0) {
3757 check_property(_class_name == vmSymbols::java_lang_Object()
3758 || (_access_flags.get_flags() & JVM_ACC_VALUE),
3759 "Invalid superclass index %u in class file %s",
3760 super_class_index,
3761 CHECK_NULL);
3762 } else {
3763 check_property(valid_klass_reference_at(super_class_index),
3764 "Invalid superclass index %u in class file %s",
3765 super_class_index,
3766 CHECK_NULL);
3767 // The class name should be legal because it is checked when parsing constant pool.
3768 // However, make sure it is not an array type.
3769 bool is_array = false;
3770 if (cp->tag_at(super_class_index).is_klass()) {
3771 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3772 if (need_verify)
3773 is_array = super_klass->is_array_klass();
3774 } else if (need_verify) {
3775 is_array = (cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3776 }
3777 if (need_verify) {
3778 guarantee_property(!is_array,
3779 "Bad superclass name in class file %s", CHECK_NULL);
3780 }
3781 }
3782 return super_klass;
3783 }
3784
3785 #ifndef PRODUCT
3786 static void print_field_layout(const Symbol* name,
3787 Array<u2>* fields,
3788 const constantPoolHandle& cp,
3789 int instance_size,
3790 int instance_fields_start,
3791 int instance_fields_end,
3792 int static_fields_end) {
3793
3794 assert(name != NULL, "invariant");
3795
3796 tty->print("%s: field layout\n", name->as_klass_external_name());
3797 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3798 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3799 if (!fs.access_flags().is_static()) {
3800 tty->print(" @%3d \"%s\" %s\n",
3801 fs.offset(),
3802 fs.name()->as_klass_external_name(),
3803 fs.signature()->as_klass_external_name());
3804 }
3805 }
3806 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3807 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3808 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3809 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3810 if (fs.access_flags().is_static()) {
3811 tty->print(" @%3d \"%s\" %s\n",
3812 fs.offset(),
3813 fs.name()->as_klass_external_name(),
3814 fs.signature()->as_klass_external_name());
3815 }
3816 }
3817 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3818 tty->print("\n");
3819 }
3820 #endif
3821
3822 // Values needed for oopmap and InstanceKlass creation
3823 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3824 public:
3825 OopMapBlocksBuilder* oop_map_blocks;
3826 int instance_size;
3827 int nonstatic_field_size;
3828 int static_field_size;
3829 bool has_nonstatic_fields;
3830 };
3831
3832 // Utility to collect and compact oop maps during layout
3833 class ClassFileParser::OopMapBlocksBuilder : public ResourceObj {
3834 public:
3835 OopMapBlock* nonstatic_oop_maps;
3836 unsigned int nonstatic_oop_map_count;
3837 unsigned int max_nonstatic_oop_maps;
3838
3839 public:
3840 OopMapBlocksBuilder(unsigned int max_blocks, TRAPS) {
3841 max_nonstatic_oop_maps = max_blocks;
3842 nonstatic_oop_map_count = 0;
3843 if (max_blocks == 0) {
3844 nonstatic_oop_maps = NULL;
3845 } else {
3846 nonstatic_oop_maps = NEW_RESOURCE_ARRAY_IN_THREAD(
3847 THREAD, OopMapBlock, max_nonstatic_oop_maps);
3848 memset(nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3849 }
3850 }
3851
3852 OopMapBlock* last_oop_map() const {
3853 assert(nonstatic_oop_map_count > 0, "Has no oop maps");
3854 return nonstatic_oop_maps + (nonstatic_oop_map_count - 1);
3855 }
3856
3857 // addition of super oop maps
3858 void initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3859 assert(nof_blocks && nonstatic_oop_map_count == 0 &&
3860 nof_blocks <= max_nonstatic_oop_maps, "invariant");
3861
3862 memcpy(nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3863 nonstatic_oop_map_count += nof_blocks;
3864 }
3865
3866 // collection of oops
3867 void add(int offset, int count) {
3868 if (nonstatic_oop_map_count == 0) {
3869 nonstatic_oop_map_count++;
3870 }
3871 OopMapBlock* nonstatic_oop_map = last_oop_map();
3872 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
3873 nonstatic_oop_map->set_offset(offset);
3874 nonstatic_oop_map->set_count(count);
3875 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
3876 nonstatic_oop_map->increment_count(count);
3877 } else { // Need a new one...
3878 nonstatic_oop_map_count++;
3879 assert(nonstatic_oop_map_count <= max_nonstatic_oop_maps, "range check");
3880 nonstatic_oop_map = last_oop_map();
3881 nonstatic_oop_map->set_offset(offset);
3882 nonstatic_oop_map->set_count(count);
3883 }
3884 }
3885
3886 // general purpose copy, e.g. into allocated instanceKlass
3887 void copy(OopMapBlock* dst) {
3888 if (nonstatic_oop_map_count != 0) {
3889 memcpy(dst, nonstatic_oop_maps, sizeof(OopMapBlock) * nonstatic_oop_map_count);
3890 }
3891 }
3892
3893 // Sort and compact adjacent blocks
3894 void compact(TRAPS) {
3895 if (nonstatic_oop_map_count <= 1) {
3896 return;
3897 }
3898 /*
3899 * Since field layout sneeks in oops before values, we will be able to condense
3900 * blocks. There is potential to compact between super, own refs and values
3901 * containing refs.
3902 *
3903 * Currently compaction is slightly limited due to values being 8 byte aligned.
3904 * This may well change: FixMe if doesn't, the code below is fairly general purpose
3905 * and maybe it doesn't need to be.
3906 */
3907 qsort(nonstatic_oop_maps, nonstatic_oop_map_count, sizeof(OopMapBlock),
3908 (_sort_Fn)OopMapBlock::compare_offset);
3909 if (nonstatic_oop_map_count < 2) {
3910 return;
3911 }
3912
3913 //Make a temp copy, and iterate through and copy back into the orig
3914 ResourceMark rm(THREAD);
3915 OopMapBlock* oop_maps_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, OopMapBlock,
3916 nonstatic_oop_map_count);
3917 OopMapBlock* oop_maps_copy_end = oop_maps_copy + nonstatic_oop_map_count;
3918 copy(oop_maps_copy);
3919 OopMapBlock* nonstatic_oop_map = nonstatic_oop_maps;
3920 unsigned int new_count = 1;
3921 oop_maps_copy++;
3922 while(oop_maps_copy < oop_maps_copy_end) {
3923 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
3924 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
3925 nonstatic_oop_map->increment_count(oop_maps_copy->count());
3926 } else {
3927 nonstatic_oop_map++;
3928 new_count++;
3929 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
3930 nonstatic_oop_map->set_count(oop_maps_copy->count());
3931 }
3932 oop_maps_copy++;
3933 }
3934 assert(new_count <= nonstatic_oop_map_count, "end up with more maps after compact() ?");
3935 nonstatic_oop_map_count = new_count;
3936 }
3937
3938 void print_on(outputStream* st) const {
3939 st->print_cr(" OopMapBlocks: %3d /%3d", nonstatic_oop_map_count, max_nonstatic_oop_maps);
3940 if (nonstatic_oop_map_count > 0) {
3941 OopMapBlock* map = nonstatic_oop_maps;
3942 OopMapBlock* last_map = last_oop_map();
3943 assert(map <= last_map, "Last less than first");
3944 while (map <= last_map) {
3945 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
3946 map->offset() + map->offset_span() - heapOopSize, map->count());
3947 map++;
3948 }
3949 }
3950 }
3951
3952 void print_value_on(outputStream* st) const {
3953 print_on(st);
3954 }
3955
3956 };
3957
3958 void ClassFileParser::throwValueTypeLimitation(THREAD_AND_LOCATION_DECL,
3959 const char* msg,
3960 const Symbol* name,
3961 const Symbol* sig) const {
3962
3963 ResourceMark rm(THREAD);
3964 if (name == NULL || sig == NULL) {
3965 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
3966 vmSymbols::java_lang_ClassFormatError(),
3967 "class: %s - %s", _class_name->as_C_string(), msg);
3968 }
3969 else {
3970 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
3971 vmSymbols::java_lang_ClassFormatError(),
3972 "\"%s\" sig: \"%s\" class: %s - %s", name->as_C_string(), sig->as_C_string(),
3973 _class_name->as_C_string(), msg);
3974 }
3975 }
3976
3977 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3978 void ClassFileParser::layout_fields(ConstantPool* cp,
3979 const FieldAllocationCount* fac,
3980 const ClassAnnotationCollector* parsed_annotations,
3981 FieldLayoutInfo* info,
3982 TRAPS) {
3983
3984 assert(cp != NULL, "invariant");
3985
3986 // Field size and offset computation
3987 int nonstatic_field_size = _super_klass == NULL ? 0 :
3988 _super_klass->nonstatic_field_size();
3989 int next_nonstatic_valuetype_offset = 0;
3990 int first_nonstatic_valuetype_offset = 0;
3991
3992 // Fields that are value types are handled differently depending if they are static or not:
3993 // - static fields are oops
3994 // - non-static fields are embedded
3995
3996 // Count the contended fields by type.
3997 //
3998 // We ignore static fields, because @Contended is not supported for them.
3999 // The layout code below will also ignore the static fields.
4000 int nonstatic_contended_count = 0;
4001 FieldAllocationCount fac_contended;
4002 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4003 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4004 if (fs.is_contended()) {
4005 fac_contended.count[atype]++;
4006 if (!fs.access_flags().is_static()) {
4007 nonstatic_contended_count++;
4008 }
4009 }
4010 }
4011
4012
4013 // Calculate the starting byte offsets
4014 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
4015 // Value types in static fields are not embedded, they are handled with oops
4016 int next_static_double_offset = next_static_oop_offset +
4017 ((fac->count[STATIC_OOP] + fac->count[STATIC_FLATTENABLE]) * heapOopSize);
4018 if (fac->count[STATIC_DOUBLE]) {
4019 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
4020 }
4021
4022 int next_static_word_offset = next_static_double_offset +
4023 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
4024 int next_static_short_offset = next_static_word_offset +
4025 ((fac->count[STATIC_WORD]) * BytesPerInt);
4026 int next_static_byte_offset = next_static_short_offset +
4027 ((fac->count[STATIC_SHORT]) * BytesPerShort);
4028
4029 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
4030 nonstatic_field_size * heapOopSize;
4031
4032 // First field of value types is aligned on a long boundary in order to ease
4033 // in-lining of value types (with header removal) in packed arrays and
4034 // flatten value types
4035 int initial_value_type_padding = 0;
4036 if (is_value_type()) {
4037 int old = nonstatic_fields_start;
4038 nonstatic_fields_start = align_up(nonstatic_fields_start, BytesPerLong);
4039 initial_value_type_padding = nonstatic_fields_start - old;
4040 }
4041
4042 int next_nonstatic_field_offset = nonstatic_fields_start;
4043
4044 const bool is_contended_class = parsed_annotations->is_contended();
4045
4046 // Class is contended, pad before all the fields
4047 if (is_contended_class) {
4048 next_nonstatic_field_offset += ContendedPaddingWidth;
4049 }
4050
4051 // Temporary value types restrictions
4052 if (is_value_type()) {
4053 if (is_contended_class) {
4054 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support @Contended annotation yet");
4055 return;
4056 }
4057 }
4058
4059 // Compute the non-contended fields count.
4060 // The packing code below relies on these counts to determine if some field
4061 // can be squeezed into the alignment gap. Contended fields are obviously
4062 // exempt from that.
4063 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
4064 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
4065 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
4066 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
4067 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
4068
4069 int static_value_type_count = 0;
4070 int nonstatic_value_type_count = 0;
4071 int* nonstatic_value_type_indexes = NULL;
4072 Klass** nonstatic_value_type_klasses = NULL;
4073 unsigned int value_type_oop_map_count = 0;
4074 int not_flattened_value_types = 0;
4075
4076 int max_nonstatic_value_type = fac->count[NONSTATIC_FLATTENABLE] + 1;
4077
4078 nonstatic_value_type_indexes = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, int,
4079 max_nonstatic_value_type);
4080 for (int i = 0; i < max_nonstatic_value_type; i++) {
4081 nonstatic_value_type_indexes[i] = -1;
4082 }
4083 nonstatic_value_type_klasses = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, Klass*,
4084 max_nonstatic_value_type);
4085
4086 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
4087 if (fs.allocation_type() == STATIC_FLATTENABLE) {
4088 // Pre-resolve the flattenable field and check for value type circularity
4089 // issues. Note that super-class circularity checks are not needed here
4090 // because flattenable fields can only be in value types and value types
4091 // only have java.lang.Object as their super class.
4092 // Also, note that super-interface circularity checks are not needed
4093 // because interfaces cannot be value types.
4094 ResourceMark rm;
4095 Symbol* sig = fs.signature();
4096 Symbol* name = SymbolTable::lookup(sig->as_C_string() + 1,
4097 sig->utf8_length() - 2, CHECK);
4098 if (!InstanceKlass::is_declared_value_type(_cp, _value_types, name)) {
4099 name->decrement_refcount();
4100 THROW(vmSymbols::java_lang_ClassFormatError());
4101 }
4102 name->decrement_refcount();
4103 Klass* klass =
4104 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4105 Handle(THREAD, _loader_data->class_loader()),
4106 _protection_domain, true, CHECK);
4107 assert(klass != NULL, "Sanity check");
4108 if (!klass->access_flags().is_value_type()) {
4109 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4110 }
4111 static_value_type_count++;
4112 } else if (fs.allocation_type() == NONSTATIC_FLATTENABLE) {
4113 // Pre-resolve the flattenable field and check for value type circularity issues.
4114 ResourceMark rm;
4115 Symbol* sig = fs.signature();
4116 Symbol* name = SymbolTable::lookup(sig->as_C_string() + 1,
4117 sig->utf8_length() - 2, CHECK);
4118 if (!InstanceKlass::is_declared_value_type(_cp, _value_types, name)) {
4119 name->decrement_refcount();
4120 THROW(vmSymbols::java_lang_ClassFormatError());
4121 }
4122 name->decrement_refcount();
4123 Klass* klass =
4124 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4125 Handle(THREAD, _loader_data->class_loader()),
4126 _protection_domain, true, CHECK);
4127 assert(klass != NULL, "Sanity check");
4128 if (!klass->access_flags().is_value_type()) {
4129 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4130 }
4131 ValueKlass* vk = ValueKlass::cast(klass);
4132 // Conditions to apply flattening or not should be defined in a single place
4133 if ((ValueFieldMaxFlatSize < 0) || (vk->size_helper() * HeapWordSize) <= ValueFieldMaxFlatSize) {
4134 nonstatic_value_type_indexes[nonstatic_value_type_count] = fs.index();
4135 nonstatic_value_type_klasses[nonstatic_value_type_count] = klass;
4136 nonstatic_value_type_count++;
4137
4138 ValueKlass* vklass = ValueKlass::cast(klass);
4139 if (vklass->contains_oops()) {
4140 value_type_oop_map_count += vklass->nonstatic_oop_map_count();
4141 }
4142 fs.set_flattened(true);
4143 } else {
4144 not_flattened_value_types++;
4145 fs.set_flattened(false);
4146 }
4147 }
4148 }
4149
4150 // Adjusting non_static_oop_count to take into account not flattened value types;
4151 nonstatic_oop_count += not_flattened_value_types;
4152
4153 // Total non-static fields count, including every contended field
4154 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
4155 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
4156 fac->count[NONSTATIC_OOP] + fac->count[NONSTATIC_FLATTENABLE];
4157
4158 const bool super_has_nonstatic_fields =
4159 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
4160 const bool has_nonstatic_fields =
4161 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
4162 const bool has_nonstatic_value_fields = nonstatic_value_type_count > 0;
4163
4164 if (is_value_type() && (!has_nonstatic_fields)) {
4165 // There are a number of fixes required throughout the type system and JIT
4166 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support zero instance size yet");
4167 return;
4168 }
4169
4170 // Prepare list of oops for oop map generation.
4171 //
4172 // "offset" and "count" lists are describing the set of contiguous oop
4173 // regions. offset[i] is the start of the i-th region, which then has
4174 // count[i] oops following. Before we know how many regions are required,
4175 // we pessimistically allocate the maps to fit all the oops into the
4176 // distinct regions.
4177 //
4178 int super_oop_map_count = (_super_klass == NULL) ? 0 :_super_klass->nonstatic_oop_map_count();
4179 int max_oop_map_count =
4180 super_oop_map_count +
4181 fac->count[NONSTATIC_OOP] +
4182 value_type_oop_map_count +
4183 not_flattened_value_types;
4184
4185 OopMapBlocksBuilder* nonstatic_oop_maps = new OopMapBlocksBuilder(max_oop_map_count, THREAD);
4186 if (super_oop_map_count > 0) {
4187 nonstatic_oop_maps->initialize_inherited_blocks(_super_klass->start_of_nonstatic_oop_maps(),
4188 _super_klass->nonstatic_oop_map_count());
4189 }
4190
4191 int first_nonstatic_oop_offset = 0; // will be set for first oop field
4192
4193 bool compact_fields = CompactFields;
4194 int allocation_style = FieldsAllocationStyle;
4195 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
4196 assert(false, "0 <= FieldsAllocationStyle <= 2");
4197 allocation_style = 1; // Optimistic
4198 }
4199
4200 // The next classes have predefined hard-coded fields offsets
4201 // (see in JavaClasses::compute_hard_coded_offsets()).
4202 // Use default fields allocation order for them.
4203 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
4204 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
4205 _class_name == vmSymbols::java_lang_Class() ||
4206 _class_name == vmSymbols::java_lang_ClassLoader() ||
4207 _class_name == vmSymbols::java_lang_ref_Reference() ||
4208 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
4209 _class_name == vmSymbols::java_lang_StackTraceElement() ||
4210 _class_name == vmSymbols::java_lang_String() ||
4211 _class_name == vmSymbols::java_lang_Throwable() ||
4212 _class_name == vmSymbols::java_lang_Boolean() ||
4213 _class_name == vmSymbols::java_lang_Character() ||
4214 _class_name == vmSymbols::java_lang_Float() ||
4215 _class_name == vmSymbols::java_lang_Double() ||
4216 _class_name == vmSymbols::java_lang_Byte() ||
4217 _class_name == vmSymbols::java_lang_Short() ||
4218 _class_name == vmSymbols::java_lang_Integer() ||
4219 _class_name == vmSymbols::java_lang_Long())) {
4220 allocation_style = 0; // Allocate oops first
4221 compact_fields = false; // Don't compact fields
4222 }
4223
4224 int next_nonstatic_oop_offset = 0;
4225 int next_nonstatic_double_offset = 0;
4226
4227 // Rearrange fields for a given allocation style
4228 if( allocation_style == 0 ) {
4229 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
4230 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4231 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4232 (nonstatic_oop_count * heapOopSize);
4233 } else if( allocation_style == 1 ) {
4234 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
4235 next_nonstatic_double_offset = next_nonstatic_field_offset;
4236 } else if( allocation_style == 2 ) {
4237 // Fields allocation: oops fields in super and sub classes are together.
4238 if( nonstatic_field_size > 0 && super_oop_map_count > 0 ) {
4239 if (next_nonstatic_field_offset == nonstatic_oop_maps->last_oop_map()->end_offset()) {
4240 allocation_style = 0; // allocate oops first
4241 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4242 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4243 (nonstatic_oop_count * heapOopSize);
4244 }
4245 }
4246 if( allocation_style == 2 ) {
4247 allocation_style = 1; // allocate oops last
4248 next_nonstatic_double_offset = next_nonstatic_field_offset;
4249 }
4250 } else {
4251 ShouldNotReachHere();
4252 }
4253
4254 int nonstatic_oop_space_count = 0;
4255 int nonstatic_word_space_count = 0;
4256 int nonstatic_short_space_count = 0;
4257 int nonstatic_byte_space_count = 0;
4258 int nonstatic_oop_space_offset = 0;
4259 int nonstatic_word_space_offset = 0;
4260 int nonstatic_short_space_offset = 0;
4261 int nonstatic_byte_space_offset = 0;
4262
4263 // Try to squeeze some of the fields into the gaps due to
4264 // long/double alignment.
4265 if (nonstatic_double_count > 0) {
4266 int offset = next_nonstatic_double_offset;
4267 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
4268 if (compact_fields && offset != next_nonstatic_double_offset) {
4269 // Allocate available fields into the gap before double field.
4270 int length = next_nonstatic_double_offset - offset;
4271 assert(length == BytesPerInt, "");
4272 nonstatic_word_space_offset = offset;
4273 if (nonstatic_word_count > 0) {
4274 nonstatic_word_count -= 1;
4275 nonstatic_word_space_count = 1; // Only one will fit
4276 length -= BytesPerInt;
4277 offset += BytesPerInt;
4278 }
4279 nonstatic_short_space_offset = offset;
4280 while (length >= BytesPerShort && nonstatic_short_count > 0) {
4281 nonstatic_short_count -= 1;
4282 nonstatic_short_space_count += 1;
4283 length -= BytesPerShort;
4284 offset += BytesPerShort;
4285 }
4286 nonstatic_byte_space_offset = offset;
4287 while (length > 0 && nonstatic_byte_count > 0) {
4288 nonstatic_byte_count -= 1;
4289 nonstatic_byte_space_count += 1;
4290 length -= 1;
4291 }
4292 // Allocate oop field in the gap if there are no other fields for that.
4293 nonstatic_oop_space_offset = offset;
4294 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
4295 allocation_style != 0) { // when oop fields not first
4296 nonstatic_oop_count -= 1;
4297 nonstatic_oop_space_count = 1; // Only one will fit
4298 length -= heapOopSize;
4299 offset += heapOopSize;
4300 }
4301 }
4302 }
4303
4304 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4305 (nonstatic_double_count * BytesPerLong);
4306 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4307 (nonstatic_word_count * BytesPerInt);
4308 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4309 (nonstatic_short_count * BytesPerShort);
4310 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4311 nonstatic_byte_count;
4312
4313 // let oops jump before padding with this allocation style
4314 if( allocation_style == 1 ) {
4315 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4316 if( nonstatic_oop_count > 0 ) {
4317 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4318 }
4319 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4320 }
4321
4322 // Aligning embedded value types
4323 // bug below, the current algorithm to layout embedded value types always put them at the
4324 // end of the layout, which doesn't match the different allocation policies the VM is
4325 // supposed to provide => FixMe
4326 // Note also that the current alignment policy is to make each value type starting on a
4327 // 64 bits boundary. This could be optimized later. For instance, it could be nice to
4328 // align value types according to their most constrained internal type.
4329 next_nonstatic_valuetype_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4330 int next_value_type_index = 0;
4331
4332 // Iterate over fields again and compute correct offsets.
4333 // The field allocation type was temporarily stored in the offset slot.
4334 // oop fields are located before non-oop fields (static and non-static).
4335 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4336
4337 // skip already laid out fields
4338 if (fs.is_offset_set()) continue;
4339
4340 // contended instance fields are handled below
4341 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4342
4343 int real_offset = 0;
4344 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4345
4346 // pack the rest of the fields
4347 switch (atype) {
4348 // Value types in static fields are handled with oops
4349 case STATIC_FLATTENABLE: // Fallthrough
4350 case STATIC_OOP:
4351 real_offset = next_static_oop_offset;
4352 next_static_oop_offset += heapOopSize;
4353 break;
4354 case STATIC_BYTE:
4355 real_offset = next_static_byte_offset;
4356 next_static_byte_offset += 1;
4357 break;
4358 case STATIC_SHORT:
4359 real_offset = next_static_short_offset;
4360 next_static_short_offset += BytesPerShort;
4361 break;
4362 case STATIC_WORD:
4363 real_offset = next_static_word_offset;
4364 next_static_word_offset += BytesPerInt;
4365 break;
4366 case STATIC_DOUBLE:
4367 real_offset = next_static_double_offset;
4368 next_static_double_offset += BytesPerLong;
4369 break;
4370 case NONSTATIC_FLATTENABLE:
4371 if (fs.is_flattened()) {
4372 Klass* klass = nonstatic_value_type_klasses[next_value_type_index];
4373 assert(klass != NULL, "Klass should have been loaded and resolved earlier");
4374 assert(klass->access_flags().is_value_type(),"Must be a value type");
4375 ValueKlass* vklass = ValueKlass::cast(klass);
4376 real_offset = next_nonstatic_valuetype_offset;
4377 next_nonstatic_valuetype_offset += (vklass->size_helper()) * wordSize - vklass->first_field_offset();
4378 // aligning next value type on a 64 bits boundary
4379 next_nonstatic_valuetype_offset = align_up(next_nonstatic_valuetype_offset, BytesPerLong);
4380 next_value_type_index += 1;
4381
4382 if (vklass->contains_oops()) { // add flatten oop maps
4383 int diff = real_offset - vklass->first_field_offset();
4384 const OopMapBlock* map = vklass->start_of_nonstatic_oop_maps();
4385 const OopMapBlock* const last_map = map + vklass->nonstatic_oop_map_count();
4386 while (map < last_map) {
4387 nonstatic_oop_maps->add(map->offset() + diff, map->count());
4388 map++;
4389 }
4390 }
4391 break;
4392 } else {
4393 // Fall through
4394 }
4395 case NONSTATIC_OOP:
4396 if( nonstatic_oop_space_count > 0 ) {
4397 real_offset = nonstatic_oop_space_offset;
4398 nonstatic_oop_space_offset += heapOopSize;
4399 nonstatic_oop_space_count -= 1;
4400 } else {
4401 real_offset = next_nonstatic_oop_offset;
4402 next_nonstatic_oop_offset += heapOopSize;
4403 }
4404 nonstatic_oop_maps->add(real_offset, 1);
4405 break;
4406 case NONSTATIC_BYTE:
4407 if( nonstatic_byte_space_count > 0 ) {
4408 real_offset = nonstatic_byte_space_offset;
4409 nonstatic_byte_space_offset += 1;
4410 nonstatic_byte_space_count -= 1;
4411 } else {
4412 real_offset = next_nonstatic_byte_offset;
4413 next_nonstatic_byte_offset += 1;
4414 }
4415 break;
4416 case NONSTATIC_SHORT:
4417 if( nonstatic_short_space_count > 0 ) {
4418 real_offset = nonstatic_short_space_offset;
4419 nonstatic_short_space_offset += BytesPerShort;
4420 nonstatic_short_space_count -= 1;
4421 } else {
4422 real_offset = next_nonstatic_short_offset;
4423 next_nonstatic_short_offset += BytesPerShort;
4424 }
4425 break;
4426 case NONSTATIC_WORD:
4427 if( nonstatic_word_space_count > 0 ) {
4428 real_offset = nonstatic_word_space_offset;
4429 nonstatic_word_space_offset += BytesPerInt;
4430 nonstatic_word_space_count -= 1;
4431 } else {
4432 real_offset = next_nonstatic_word_offset;
4433 next_nonstatic_word_offset += BytesPerInt;
4434 }
4435 break;
4436 case NONSTATIC_DOUBLE:
4437 real_offset = next_nonstatic_double_offset;
4438 next_nonstatic_double_offset += BytesPerLong;
4439 break;
4440 default:
4441 ShouldNotReachHere();
4442 }
4443 fs.set_offset(real_offset);
4444 }
4445
4446
4447 // Handle the contended cases.
4448 //
4449 // Each contended field should not intersect the cache line with another contended field.
4450 // In the absence of alignment information, we end up with pessimistically separating
4451 // the fields with full-width padding.
4452 //
4453 // Additionally, this should not break alignment for the fields, so we round the alignment up
4454 // for each field.
4455 if (nonstatic_contended_count > 0) {
4456
4457 // if there is at least one contended field, we need to have pre-padding for them
4458 next_nonstatic_padded_offset += ContendedPaddingWidth;
4459
4460 // collect all contended groups
4461 ResourceBitMap bm(cp->size());
4462 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4463 // skip already laid out fields
4464 if (fs.is_offset_set()) continue;
4465
4466 if (fs.is_contended()) {
4467 bm.set_bit(fs.contended_group());
4468 }
4469 }
4470
4471 int current_group = -1;
4472 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4473
4474 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4475
4476 // skip already laid out fields
4477 if (fs.is_offset_set()) continue;
4478
4479 // skip non-contended fields and fields from different group
4480 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4481
4482 // handle statics below
4483 if (fs.access_flags().is_static()) continue;
4484
4485 int real_offset = 0;
4486 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4487
4488 switch (atype) {
4489 case NONSTATIC_BYTE:
4490 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4491 real_offset = next_nonstatic_padded_offset;
4492 next_nonstatic_padded_offset += 1;
4493 break;
4494
4495 case NONSTATIC_SHORT:
4496 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4497 real_offset = next_nonstatic_padded_offset;
4498 next_nonstatic_padded_offset += BytesPerShort;
4499 break;
4500
4501 case NONSTATIC_WORD:
4502 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4503 real_offset = next_nonstatic_padded_offset;
4504 next_nonstatic_padded_offset += BytesPerInt;
4505 break;
4506
4507 case NONSTATIC_DOUBLE:
4508 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4509 real_offset = next_nonstatic_padded_offset;
4510 next_nonstatic_padded_offset += BytesPerLong;
4511 break;
4512
4513 // Value types in static fields are handled with oops
4514 case NONSTATIC_FLATTENABLE:
4515 throwValueTypeLimitation(THREAD_AND_LOCATION,
4516 "@Contended annotation not supported for value types yet", fs.name(), fs.signature());
4517 return;
4518
4519 case NONSTATIC_OOP:
4520 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4521 real_offset = next_nonstatic_padded_offset;
4522 next_nonstatic_padded_offset += heapOopSize;
4523 nonstatic_oop_maps->add(real_offset, 1);
4524 break;
4525
4526 default:
4527 ShouldNotReachHere();
4528 }
4529
4530 if (fs.contended_group() == 0) {
4531 // Contended group defines the equivalence class over the fields:
4532 // the fields within the same contended group are not inter-padded.
4533 // The only exception is default group, which does not incur the
4534 // equivalence, and so requires intra-padding.
4535 next_nonstatic_padded_offset += ContendedPaddingWidth;
4536 }
4537
4538 fs.set_offset(real_offset);
4539 } // for
4540
4541 // Start laying out the next group.
4542 // Note that this will effectively pad the last group in the back;
4543 // this is expected to alleviate memory contention effects for
4544 // subclass fields and/or adjacent object.
4545 // If this was the default group, the padding is already in place.
4546 if (current_group != 0) {
4547 next_nonstatic_padded_offset += ContendedPaddingWidth;
4548 }
4549 }
4550
4551 // handle static fields
4552 }
4553
4554 // Entire class is contended, pad in the back.
4555 // This helps to alleviate memory contention effects for subclass fields
4556 // and/or adjacent object.
4557 if (is_contended_class) {
4558 assert(!is_value_type(), "@Contended not supported for value types yet");
4559 next_nonstatic_padded_offset += ContendedPaddingWidth;
4560 }
4561
4562 int notaligned_nonstatic_fields_end;
4563 if (nonstatic_value_type_count != 0) {
4564 notaligned_nonstatic_fields_end = next_nonstatic_valuetype_offset;
4565 } else {
4566 notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4567 }
4568
4569 int nonstatic_field_sz_align = heapOopSize;
4570 if (is_value_type()) {
4571 if ((notaligned_nonstatic_fields_end - nonstatic_fields_start) > heapOopSize) {
4572 nonstatic_field_sz_align = BytesPerLong; // value copy of fields only uses jlong copy
4573 }
4574 }
4575 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, nonstatic_field_sz_align);
4576 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4577 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4578
4579 int static_field_size = (static_fields_end -
4580 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4581 nonstatic_field_size = nonstatic_field_size +
4582 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4583
4584 int instance_size = align_object_size(instance_end / wordSize);
4585
4586 assert(instance_size == align_object_size(align_up(
4587 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize)
4588 + initial_value_type_padding, wordSize) / wordSize), "consistent layout helper value");
4589
4590
4591 // Invariant: nonstatic_field end/start should only change if there are
4592 // nonstatic fields in the class, or if the class is contended. We compare
4593 // against the non-aligned value, so that end alignment will not fail the
4594 // assert without actually having the fields.
4595 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4596 is_contended_class ||
4597 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4598
4599 // Number of non-static oop map blocks allocated at end of klass.
4600 nonstatic_oop_maps->compact(THREAD);
4601
4602 #ifndef PRODUCT
4603 if ((PrintFieldLayout && !is_value_type()) ||
4604 (PrintValueLayout && (is_value_type() || has_nonstatic_value_fields))) {
4605 print_field_layout(_class_name,
4606 _fields,
4607 cp,
4608 instance_size,
4609 nonstatic_fields_start,
4610 nonstatic_fields_end,
4611 static_fields_end);
4612 nonstatic_oop_maps->print_on(tty);
4613 tty->print("\n");
4614 }
4615
4616 #endif
4617 // Pass back information needed for InstanceKlass creation
4618 info->oop_map_blocks = nonstatic_oop_maps;
4619 info->instance_size = instance_size;
4620 info->static_field_size = static_field_size;
4621 info->nonstatic_field_size = nonstatic_field_size;
4622 info->has_nonstatic_fields = has_nonstatic_fields;
4623 }
4624
4625 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik, TRAPS) {
4626 assert(ik != NULL, "invariant");
4627
4628 const Klass* const super = ik->super();
4629
4630 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4631 // in which case we don't have to register objects as finalizable
4632 if (!_has_empty_finalizer) {
4633 if (_has_finalizer ||
4634 (super != NULL && super->has_finalizer())) {
4635 ik->set_has_finalizer();
4636 }
4637 }
4638
4639 #ifdef ASSERT
4640 bool f = false;
4641 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4642 vmSymbols::void_method_signature());
4643 if (m != NULL && !m->is_empty_method()) {
4644 f = true;
4645 }
4646
4647 // Spec doesn't prevent agent from redefinition of empty finalizer.
4648 // Despite the fact that it's generally bad idea and redefined finalizer
4649 // will not work as expected we shouldn't abort vm in this case
4650 if (!ik->has_redefined_this_or_super()) {
4651 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4652 }
4653 #endif
4654
4655 // Check if this klass supports the java.lang.Cloneable interface
4656 if (SystemDictionary::Cloneable_klass_loaded()) {
4657 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4658 if (ik->is_value()) {
4659 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support Cloneable");
4660 return;
4661 }
4662 ik->set_is_cloneable();
4663 }
4664 }
4665
4666 // Check if this klass has a vanilla default constructor
4667 if (super == NULL) {
4668 // java.lang.Object has empty default constructor
4669 ik->set_has_vanilla_constructor();
4670 } else {
4671 if (super->has_vanilla_constructor() &&
4672 _has_vanilla_constructor) {
4673 ik->set_has_vanilla_constructor();
4674 }
4675 #ifdef ASSERT
4676 bool v = false;
4677 if (super->has_vanilla_constructor()) {
4678 const Method* const constructor =
4679 ik->find_method(vmSymbols::object_initializer_name(),
4680 vmSymbols::void_method_signature());
4681 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4682 v = true;
4683 }
4684 }
4685 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4686 #endif
4687 }
4688
4689 // If it cannot be fast-path allocated, set a bit in the layout helper.
4690 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4691 assert(ik->size_helper() > 0, "layout_helper is initialized");
4692 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4693 || ik->is_abstract() || ik->is_interface()
4694 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4695 || ik->size_helper() >= FastAllocateSizeLimit) {
4696 // Forbid fast-path allocation.
4697 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4698 ik->set_layout_helper(lh);
4699 }
4700 }
4701
4702 bool ClassFileParser::supports_value_types() const {
4703 // Value types are only supported by class file version 55 and later
4704 return _major_version >= JAVA_11_VERSION;
4705 }
4706
4707 // Attach super classes and interface classes to class loader data
4708 static void record_defined_class_dependencies(const InstanceKlass* defined_klass,
4709 TRAPS) {
4710 assert(defined_klass != NULL, "invariant");
4711
4712 ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data();
4713 if (defining_loader_data->is_the_null_class_loader_data()) {
4714 // Dependencies to null class loader data are implicit.
4715 return;
4716 } else {
4717 // add super class dependency
4718 Klass* const super = defined_klass->super();
4719 if (super != NULL) {
4720 defining_loader_data->record_dependency(super);
4721 }
4722
4723 // add super interface dependencies
4724 const Array<Klass*>* const local_interfaces = defined_klass->local_interfaces();
4725 if (local_interfaces != NULL) {
4726 const int length = local_interfaces->length();
4727 for (int i = 0; i < length; i++) {
4728 defining_loader_data->record_dependency(local_interfaces->at(i));
4729 }
4730 }
4731
4732 for(int i = 0; i < defined_klass->java_fields_count(); i++) {
4733 if ((defined_klass->field_access_flags(i) & JVM_ACC_FLATTENABLE) != 0) {
4734 const Klass* klass = defined_klass->get_value_field_klass(i);
4735 defining_loader_data->record_dependency(klass);
4736 }
4737 }
4738 }
4739 }
4740
4741 // utility methods for appending an array with check for duplicates
4742
4743 static void append_interfaces(GrowableArray<Klass*>* result,
4744 const Array<Klass*>* const ifs) {
4745 // iterate over new interfaces
4746 for (int i = 0; i < ifs->length(); i++) {
4747 Klass* const e = ifs->at(i);
4748 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4749 // add new interface
4750 result->append_if_missing(e);
4751 }
4752 }
4753
4754 static Array<Klass*>* compute_transitive_interfaces(const InstanceKlass* super,
4755 Array<Klass*>* local_ifs,
4756 ClassLoaderData* loader_data,
4757 TRAPS) {
4758 assert(local_ifs != NULL, "invariant");
4759 assert(loader_data != NULL, "invariant");
4760
4761 // Compute maximum size for transitive interfaces
4762 int max_transitive_size = 0;
4763 int super_size = 0;
4764 // Add superclass transitive interfaces size
4765 if (super != NULL) {
4766 super_size = super->transitive_interfaces()->length();
4767 max_transitive_size += super_size;
4768 }
4769 // Add local interfaces' super interfaces
4770 const int local_size = local_ifs->length();
4771 for (int i = 0; i < local_size; i++) {
4772 Klass* const l = local_ifs->at(i);
4773 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4774 }
4775 // Finally add local interfaces
4776 max_transitive_size += local_size;
4777 // Construct array
4778 if (max_transitive_size == 0) {
4779 // no interfaces, use canonicalized array
4780 return Universe::the_empty_klass_array();
4781 } else if (max_transitive_size == super_size) {
4782 // no new local interfaces added, share superklass' transitive interface array
4783 return super->transitive_interfaces();
4784 } else if (max_transitive_size == local_size) {
4785 // only local interfaces added, share local interface array
4786 return local_ifs;
4787 } else {
4788 ResourceMark rm;
4789 GrowableArray<Klass*>* const result = new GrowableArray<Klass*>(max_transitive_size);
4790
4791 // Copy down from superclass
4792 if (super != NULL) {
4793 append_interfaces(result, super->transitive_interfaces());
4794 }
4795
4796 // Copy down from local interfaces' superinterfaces
4797 for (int i = 0; i < local_size; i++) {
4798 Klass* const l = local_ifs->at(i);
4799 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4800 }
4801 // Finally add local interfaces
4802 append_interfaces(result, local_ifs);
4803
4804 // length will be less than the max_transitive_size if duplicates were removed
4805 const int length = result->length();
4806 assert(length <= max_transitive_size, "just checking");
4807 Array<Klass*>* const new_result =
4808 MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL);
4809 for (int i = 0; i < length; i++) {
4810 Klass* const e = result->at(i);
4811 assert(e != NULL, "just checking");
4812 new_result->at_put(i, e);
4813 }
4814 return new_result;
4815 }
4816 }
4817
4818 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4819 assert(this_klass != NULL, "invariant");
4820 const Klass* const super = this_klass->super();
4821 if (super != NULL) {
4822
4823 // If the loader is not the boot loader then throw an exception if its
4824 // superclass is in package jdk.internal.reflect and its loader is not a
4825 // special reflection class loader
4826 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4827 assert(super->is_instance_klass(), "super is not instance klass");
4828 PackageEntry* super_package = super->package();
4829 if (super_package != NULL &&
4830 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4831 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4832 ResourceMark rm(THREAD);
4833 Exceptions::fthrow(
4834 THREAD_AND_LOCATION,
4835 vmSymbols::java_lang_IllegalAccessError(),
4836 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4837 this_klass->external_name(),
4838 this_klass->class_loader_data()->loader_name(),
4839 super->external_name());
4840 return;
4841 }
4842 }
4843
4844 Reflection::VerifyClassAccessResults vca_result =
4845 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4846 if (vca_result != Reflection::ACCESS_OK) {
4847 ResourceMark rm(THREAD);
4848 char* msg = Reflection::verify_class_access_msg(this_klass,
4849 InstanceKlass::cast(super),
4850 vca_result);
4851 if (msg == NULL) {
4852 Exceptions::fthrow(
4853 THREAD_AND_LOCATION,
4854 vmSymbols::java_lang_IllegalAccessError(),
4855 "class %s cannot access its superclass %s",
4856 this_klass->external_name(),
4857 super->external_name());
4858 } else {
4859 // Add additional message content.
4860 Exceptions::fthrow(
4861 THREAD_AND_LOCATION,
4862 vmSymbols::java_lang_IllegalAccessError(),
4863 "superclass access check failed: %s",
4864 msg);
4865 }
4866 }
4867 }
4868 }
4869
4870
4871 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4872 assert(this_klass != NULL, "invariant");
4873 const Array<Klass*>* const local_interfaces = this_klass->local_interfaces();
4874 const int lng = local_interfaces->length();
4875 for (int i = lng - 1; i >= 0; i--) {
4876 Klass* const k = local_interfaces->at(i);
4877 assert (k != NULL && k->is_interface(), "invalid interface");
4878 Reflection::VerifyClassAccessResults vca_result =
4879 Reflection::verify_class_access(this_klass, InstanceKlass::cast(k), false);
4880 if (vca_result != Reflection::ACCESS_OK) {
4881 ResourceMark rm(THREAD);
4882 char* msg = Reflection::verify_class_access_msg(this_klass,
4883 InstanceKlass::cast(k),
4884 vca_result);
4885 if (msg == NULL) {
4886 Exceptions::fthrow(
4887 THREAD_AND_LOCATION,
4888 vmSymbols::java_lang_IllegalAccessError(),
4889 "class %s cannot access its superinterface %s",
4890 this_klass->external_name(),
4891 k->external_name());
4892 } else {
4893 // Add additional message content.
4894 Exceptions::fthrow(
4895 THREAD_AND_LOCATION,
4896 vmSymbols::java_lang_IllegalAccessError(),
4897 "superinterface check failed: %s",
4898 msg);
4899 }
4900 }
4901 }
4902 }
4903
4904
4905 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4906 assert(this_klass != NULL, "invariant");
4907 const Array<Method*>* const methods = this_klass->methods();
4908 const int num_methods = methods->length();
4909
4910 // go thru each method and check if it overrides a final method
4911 for (int index = 0; index < num_methods; index++) {
4912 const Method* const m = methods->at(index);
4913
4914 // skip private, static, and <init> methods
4915 if ((!m->is_private() && !m->is_static()) &&
4916 (m->name() != vmSymbols::object_initializer_name())) {
4917
4918 const Symbol* const name = m->name();
4919 const Symbol* const signature = m->signature();
4920 const Klass* k = this_klass->super();
4921 const Method* super_m = NULL;
4922 while (k != NULL) {
4923 // skip supers that don't have final methods.
4924 if (k->has_final_method()) {
4925 // lookup a matching method in the super class hierarchy
4926 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4927 if (super_m == NULL) {
4928 break; // didn't find any match; get out
4929 }
4930
4931 if (super_m->is_final() && !super_m->is_static() &&
4932 // matching method in super is final, and not static
4933 (Reflection::verify_field_access(this_klass,
4934 super_m->method_holder(),
4935 super_m->method_holder(),
4936 super_m->access_flags(), false))
4937 // this class can access super final method and therefore override
4938 ) {
4939 ResourceMark rm(THREAD);
4940 Exceptions::fthrow(
4941 THREAD_AND_LOCATION,
4942 vmSymbols::java_lang_VerifyError(),
4943 "class %s overrides final method %s.%s%s",
4944 this_klass->external_name(),
4945 super_m->method_holder()->external_name(),
4946 name->as_C_string(),
4947 signature->as_C_string()
4948 );
4949 return;
4950 }
4951
4952 // continue to look from super_m's holder's super.
4953 k = super_m->method_holder()->super();
4954 continue;
4955 }
4956
4957 k = k->super();
4958 }
4959 }
4960 }
4961 }
4962
4963
4964 // assumes that this_klass is an interface
4965 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4966 assert(this_klass != NULL, "invariant");
4967 assert(this_klass->is_interface(), "not an interface");
4968 const Array<Method*>* methods = this_klass->methods();
4969 const int num_methods = methods->length();
4970
4971 for (int index = 0; index < num_methods; index++) {
4972 const Method* const m = methods->at(index);
4973 // if m is static and not the init method, throw a verify error
4974 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4975 ResourceMark rm(THREAD);
4976 Exceptions::fthrow(
4977 THREAD_AND_LOCATION,
4978 vmSymbols::java_lang_VerifyError(),
4979 "Illegal static method %s in interface %s",
4980 m->name()->as_C_string(),
4981 this_klass->external_name()
4982 );
4983 return;
4984 }
4985 }
4986 }
4987
4988 // utility methods for format checking
4989
4990 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4991 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4992 const bool is_value_type = (flags & JVM_ACC_VALUE) != 0;
4993 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4994 assert(supports_value_types() || !is_value_type, "JVM_ACC_VALUE should not be set");
4995 if (is_module) {
4996 ResourceMark rm(THREAD);
4997 Exceptions::fthrow(
4998 THREAD_AND_LOCATION,
4999 vmSymbols::java_lang_NoClassDefFoundError(),
5000 "%s is not a class because access_flag ACC_MODULE is set",
5001 _class_name->as_C_string());
5002 return;
5003 }
5004
5005 if (is_value_type && !EnableValhalla) {
5006 ResourceMark rm(THREAD);
5007 Exceptions::fthrow(
5008 THREAD_AND_LOCATION,
5009 vmSymbols::java_lang_ClassFormatError(),
5010 "Class modifier ACC_VALUE in class %s requires option -XX:+EnableValhalla",
5011 _class_name->as_C_string()
5012 );
5013 }
5014
5015 if (!_need_verify) { return; }
5016
5017 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5018 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5019 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5020 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
5021 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5022 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
5023 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5024
5025 if ((is_abstract && is_final) ||
5026 (is_interface && !is_abstract) ||
5027 (is_interface && major_gte_15 && (is_super || is_enum)) ||
5028 (!is_interface && major_gte_15 && is_annotation) ||
5029 (is_value_type && (is_interface || is_abstract || is_enum || !is_final))) {
5030 ResourceMark rm(THREAD);
5031 Exceptions::fthrow(
5032 THREAD_AND_LOCATION,
5033 vmSymbols::java_lang_ClassFormatError(),
5034 "Illegal class modifiers in class %s: 0x%X",
5035 _class_name->as_C_string(), flags
5036 );
5037 return;
5038 }
5039 }
5040
5041 static bool has_illegal_visibility(jint flags) {
5042 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5043 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5044 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5045
5046 return ((is_public && is_protected) ||
5047 (is_public && is_private) ||
5048 (is_protected && is_private));
5049 }
5050
5051 // A legal major_version.minor_version must be one of the following:
5052 //
5053 // Major_version = 45, any minor_version.
5054 // Major_version >= 46 and major_version <= current_major_version and minor_version = 0.
5055 // Major_version = current_major_version and minor_version = 65535 and --enable-preview is present.
5056 //
5057 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
5058 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
5059 if (major != JAVA_MIN_SUPPORTED_VERSION) { // All 45.* are ok including 45.65535
5060 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
5061 if (major != max_version) {
5062 ResourceMark rm(THREAD);
5063 Exceptions::fthrow(
5064 THREAD_AND_LOCATION,
5065 vmSymbols::java_lang_UnsupportedClassVersionError(),
5066 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
5067 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
5068 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
5069 return;
5070 }
5071
5072 if (!Arguments::enable_preview()) {
5073 ResourceMark rm(THREAD);
5074 Exceptions::fthrow(
5075 THREAD_AND_LOCATION,
5076 vmSymbols::java_lang_UnsupportedClassVersionError(),
5077 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
5078 class_name->as_C_string(), major, minor);
5079 return;
5080 }
5081
5082 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
5083 if (major > max_version) {
5084 ResourceMark rm(THREAD);
5085 Exceptions::fthrow(
5086 THREAD_AND_LOCATION,
5087 vmSymbols::java_lang_UnsupportedClassVersionError(),
5088 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5089 "this version of the Java Runtime only recognizes class file versions up to %u.0",
5090 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
5091 } else if (major < JAVA_MIN_SUPPORTED_VERSION) {
5092 ResourceMark rm(THREAD);
5093 Exceptions::fthrow(
5094 THREAD_AND_LOCATION,
5095 vmSymbols::java_lang_UnsupportedClassVersionError(),
5096 "%s (class file version %u.%u) was compiled with an invalid major version",
5097 class_name->as_C_string(), major, minor);
5098 } else if (minor != 0) {
5099 ResourceMark rm(THREAD);
5100 Exceptions::fthrow(
5101 THREAD_AND_LOCATION,
5102 vmSymbols::java_lang_UnsupportedClassVersionError(),
5103 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
5104 class_name->as_C_string(), major, minor);
5105 }
5106 }
5107 }
5108 }
5109
5110 void ClassFileParser::verify_legal_field_modifiers(jint flags,
5111 bool is_interface,
5112 bool is_value_type,
5113 TRAPS) const {
5114 if (!_need_verify) { return; }
5115
5116 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5117 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5118 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5119 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5120 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5121 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
5122 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
5123 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5124 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5125
5126 bool is_illegal = false;
5127
5128 if (is_interface) {
5129 if (!is_public || !is_static || !is_final || is_private ||
5130 is_protected || is_volatile || is_transient ||
5131 (major_gte_15 && is_enum)) {
5132 is_illegal = true;
5133 }
5134 } else { // not interface
5135 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
5136 is_illegal = true;
5137 } else {
5138 if (is_value_type && !is_static && !is_final) {
5139 is_illegal = true;
5140 }
5141 }
5142 }
5143
5144 if (is_illegal) {
5145 ResourceMark rm(THREAD);
5146 Exceptions::fthrow(
5147 THREAD_AND_LOCATION,
5148 vmSymbols::java_lang_ClassFormatError(),
5149 "Illegal field modifiers in class %s: 0x%X",
5150 _class_name->as_C_string(), flags);
5151 return;
5152 }
5153 }
5154
5155 void ClassFileParser::verify_legal_method_modifiers(jint flags,
5156 bool is_interface,
5157 bool is_value_type,
5158 const Symbol* name,
5159 TRAPS) const {
5160 if (!_need_verify) { return; }
5161
5162 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5163 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5164 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5165 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5166 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
5167 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5168 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
5169 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
5170 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
5171 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5172 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5173 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
5174 const bool is_initializer = (name == vmSymbols::object_initializer_name());
5175
5176 bool is_illegal = false;
5177
5178 if (is_interface) {
5179 if (major_gte_8) {
5180 // Class file version is JAVA_8_VERSION or later Methods of
5181 // interfaces may set any of the flags except ACC_PROTECTED,
5182 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5183 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5184 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5185 (is_native || is_protected || is_final || is_synchronized) ||
5186 // If a specific method of a class or interface has its
5187 // ACC_ABSTRACT flag set, it must not have any of its
5188 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5189 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
5190 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5191 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5192 (is_abstract && (is_private || is_static || is_strict))) {
5193 is_illegal = true;
5194 }
5195 } else if (major_gte_15) {
5196 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5197 if (!is_public || is_private || is_protected || is_static || is_final ||
5198 is_synchronized || is_native || !is_abstract || is_strict) {
5199 is_illegal = true;
5200 }
5201 } else {
5202 // Class file version is pre-JAVA_1_5_VERSION
5203 if (!is_public || is_static || is_final || is_native || !is_abstract) {
5204 is_illegal = true;
5205 }
5206 }
5207 } else { // not interface
5208 if (has_illegal_visibility(flags)) {
5209 is_illegal = true;
5210 } else {
5211 if (is_initializer) {
5212 if (is_static || is_final || is_synchronized || is_native ||
5213 is_abstract || (major_gte_15 && is_bridge)) {
5214 is_illegal = true;
5215 }
5216 } else { // not initializer
5217 if (is_value_type && is_synchronized && !is_static) {
5218 is_illegal = true;
5219 } else {
5220 if (is_abstract) {
5221 if ((is_final || is_native || is_private || is_static ||
5222 (major_gte_15 && (is_synchronized || is_strict)))) {
5223 is_illegal = true;
5224 }
5225 }
5226 }
5227 }
5228 }
5229 }
5230
5231 if (is_illegal) {
5232 ResourceMark rm(THREAD);
5233 Exceptions::fthrow(
5234 THREAD_AND_LOCATION,
5235 vmSymbols::java_lang_ClassFormatError(),
5236 "Method %s in class %s has illegal modifiers: 0x%X",
5237 name->as_C_string(), _class_name->as_C_string(), flags);
5238 return;
5239 }
5240 }
5241
5242 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5243 int length,
5244 TRAPS) const {
5245 assert(_need_verify, "only called when _need_verify is true");
5246 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5247 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5248 }
5249 }
5250
5251 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5252 // In class names, '/' separates unqualified names. This is verified in this function also.
5253 // Method names also may not contain the characters '<' or '>', unless <init>
5254 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5255 // method. Because these names have been checked as special cases before
5256 // calling this method in verify_legal_method_name.
5257 //
5258 // This method is also called from the modular system APIs in modules.cpp
5259 // to verify the validity of module and package names.
5260 bool ClassFileParser::verify_unqualified_name(const char* name,
5261 unsigned int length,
5262 int type) {
5263 for (const char* p = name; p != name + length;) {
5264 jchar ch = *p;
5265 if (ch < 128) {
5266 if (ch == '.' || ch == ';' || ch == '[' ) {
5267 return false; // do not permit '.', ';', or '['
5268 }
5269 if (ch == '/') {
5270 // check for '//' or leading or trailing '/' which are not legal
5271 // unqualified name must not be empty
5272 if (type == ClassFileParser::LegalClass) {
5273 if (p == name || p+1 >= name+length || *(p+1) == '/') {
5274 return false;
5275 }
5276 } else {
5277 return false; // do not permit '/' unless it's class name
5278 }
5279 }
5280 if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) {
5281 return false; // do not permit '<' or '>' in method names
5282 }
5283 p++;
5284 } else {
5285 char* tmp_p = UTF8::next(p, &ch);
5286 p = tmp_p;
5287 }
5288 }
5289 return true;
5290 }
5291
5292 // Take pointer to a string. Skip over the longest part of the string that could
5293 // be taken as a fieldname. Allow '/' if slash_ok is true.
5294 // Return a pointer to just past the fieldname.
5295 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5296 // being true, we saw consecutive slashes (meaning we were looking for a
5297 // qualified path but found something that was badly-formed).
5298 static const char* skip_over_field_name(const char* name,
5299 bool slash_ok,
5300 unsigned int length) {
5301 const char* p;
5302 jboolean last_is_slash = false;
5303 jboolean not_first_ch = false;
5304
5305 for (p = name; p != name + length; not_first_ch = true) {
5306 const char* old_p = p;
5307 jchar ch = *p;
5308 if (ch < 128) {
5309 p++;
5310 // quick check for ascii
5311 if ((ch >= 'a' && ch <= 'z') ||
5312 (ch >= 'A' && ch <= 'Z') ||
5313 (ch == '_' || ch == '$') ||
5314 (not_first_ch && ch >= '0' && ch <= '9')) {
5315 last_is_slash = false;
5316 continue;
5317 }
5318 if (slash_ok && ch == '/') {
5319 if (last_is_slash) {
5320 return NULL; // Don't permit consecutive slashes
5321 }
5322 last_is_slash = true;
5323 continue;
5324 }
5325 }
5326 else {
5327 jint unicode_ch;
5328 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5329 p = tmp_p;
5330 last_is_slash = false;
5331 // Check if ch is Java identifier start or is Java identifier part
5332 // 4672820: call java.lang.Character methods directly without generating separate tables.
5333 EXCEPTION_MARK;
5334
5335 // return value
5336 JavaValue result(T_BOOLEAN);
5337 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5338 JavaCallArguments args;
5339 args.push_int(unicode_ch);
5340
5341 // public static boolean isJavaIdentifierStart(char ch);
5342 JavaCalls::call_static(&result,
5343 SystemDictionary::Character_klass(),
5344 vmSymbols::isJavaIdentifierStart_name(),
5345 vmSymbols::int_bool_signature(),
5346 &args,
5347 THREAD);
5348
5349 if (HAS_PENDING_EXCEPTION) {
5350 CLEAR_PENDING_EXCEPTION;
5351 return 0;
5352 }
5353 if (result.get_jboolean()) {
5354 continue;
5355 }
5356
5357 if (not_first_ch) {
5358 // public static boolean isJavaIdentifierPart(char ch);
5359 JavaCalls::call_static(&result,
5360 SystemDictionary::Character_klass(),
5361 vmSymbols::isJavaIdentifierPart_name(),
5362 vmSymbols::int_bool_signature(),
5363 &args,
5364 THREAD);
5365
5366 if (HAS_PENDING_EXCEPTION) {
5367 CLEAR_PENDING_EXCEPTION;
5368 return 0;
5369 }
5370
5371 if (result.get_jboolean()) {
5372 continue;
5373 }
5374 }
5375 }
5376 return (not_first_ch) ? old_p : NULL;
5377 }
5378 return (not_first_ch) ? p : NULL;
5379 }
5380
5381 // Take pointer to a string. Skip over the longest part of the string that could
5382 // be taken as a field signature. Allow "void" if void_ok.
5383 // Return a pointer to just past the signature.
5384 // Return NULL if no legal signature is found.
5385 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5386 bool void_ok,
5387 unsigned int length,
5388 TRAPS) const {
5389 unsigned int array_dim = 0;
5390 while (length > 0) {
5391 switch (signature[0]) {
5392 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5393 case JVM_SIGNATURE_BOOLEAN:
5394 case JVM_SIGNATURE_BYTE:
5395 case JVM_SIGNATURE_CHAR:
5396 case JVM_SIGNATURE_SHORT:
5397 case JVM_SIGNATURE_INT:
5398 case JVM_SIGNATURE_FLOAT:
5399 case JVM_SIGNATURE_LONG:
5400 case JVM_SIGNATURE_DOUBLE:
5401 return signature + 1;
5402 case JVM_SIGNATURE_CLASS:
5403 {
5404 if (_major_version < JAVA_1_5_VERSION) {
5405 // Skip over the class name if one is there
5406 const char* const p = skip_over_field_name(signature + 1, true, --length);
5407
5408 // The next character better be a semicolon
5409 if (p && (p - signature) > 1 && p[0] == ';') {
5410 return p + 1;
5411 }
5412 }
5413 else {
5414 // Skip leading 'L' and ignore first appearance of ';'
5415 length--;
5416 signature++;
5417 char* c = strchr((char*) signature, ';');
5418 // Format check signature
5419 if (c != NULL) {
5420 ResourceMark rm(THREAD);
5421 int newlen = c - (char*) signature;
5422 char* sig = NEW_RESOURCE_ARRAY(char, newlen + 1);
5423 strncpy(sig, signature, newlen);
5424 sig[newlen] = '\0';
5425
5426 bool legal = verify_unqualified_name(sig, newlen, LegalClass);
5427 if (!legal) {
5428 classfile_parse_error("Class name contains illegal character "
5429 "in descriptor in class file %s",
5430 CHECK_0);
5431 return NULL;
5432 }
5433 return signature + newlen + 1;
5434 }
5435 }
5436 return NULL;
5437 }
5438 case JVM_SIGNATURE_ARRAY:
5439 array_dim++;
5440 if (array_dim > 255) {
5441 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5442 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5443 }
5444 // The rest of what's there better be a legal signature
5445 signature++;
5446 length--;
5447 void_ok = false;
5448 break;
5449 default:
5450 return NULL;
5451 }
5452 }
5453 return NULL;
5454 }
5455
5456 // Checks if name is a legal class name.
5457 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5458 if (!_need_verify || _relax_verify) { return; }
5459
5460 char buf[fixed_buffer_size];
5461 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5462 unsigned int length = name->utf8_length();
5463 bool legal = false;
5464
5465 if (length > 0) {
5466 const char* p;
5467 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5468 p = skip_over_field_signature(bytes, false, length, CHECK);
5469 legal = (p != NULL) && ((p - bytes) == (int)length);
5470 } else if (_major_version < JAVA_1_5_VERSION) {
5471 if (bytes[0] != '<') {
5472 p = skip_over_field_name(bytes, true, length);
5473 legal = (p != NULL) && ((p - bytes) == (int)length);
5474 }
5475 } else {
5476 // 4900761: relax the constraints based on JSR202 spec
5477 // Class names may be drawn from the entire Unicode character set.
5478 // Identifiers between '/' must be unqualified names.
5479 // The utf8 string has been verified when parsing cpool entries.
5480 legal = verify_unqualified_name(bytes, length, LegalClass);
5481 }
5482 }
5483 if (!legal) {
5484 ResourceMark rm(THREAD);
5485 assert(_class_name != NULL, "invariant");
5486 Exceptions::fthrow(
5487 THREAD_AND_LOCATION,
5488 vmSymbols::java_lang_ClassFormatError(),
5489 "Illegal class name \"%s\" in class file %s", bytes,
5490 _class_name->as_C_string()
5491 );
5492 return;
5493 }
5494 }
5495
5496 // Checks if name is a legal field name.
5497 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5498 if (!_need_verify || _relax_verify) { return; }
5499
5500 char buf[fixed_buffer_size];
5501 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5502 unsigned int length = name->utf8_length();
5503 bool legal = false;
5504
5505 if (length > 0) {
5506 if (_major_version < JAVA_1_5_VERSION) {
5507 if (bytes[0] != '<') {
5508 const char* p = skip_over_field_name(bytes, false, length);
5509 legal = (p != NULL) && ((p - bytes) == (int)length);
5510 }
5511 } else {
5512 // 4881221: relax the constraints based on JSR202 spec
5513 legal = verify_unqualified_name(bytes, length, LegalField);
5514 }
5515 }
5516
5517 if (!legal) {
5518 ResourceMark rm(THREAD);
5519 assert(_class_name != NULL, "invariant");
5520 Exceptions::fthrow(
5521 THREAD_AND_LOCATION,
5522 vmSymbols::java_lang_ClassFormatError(),
5523 "Illegal field name \"%s\" in class %s", bytes,
5524 _class_name->as_C_string()
5525 );
5526 return;
5527 }
5528 }
5529
5530 // Checks if name is a legal method name.
5531 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5532 if (!_need_verify || _relax_verify) { return; }
5533
5534 assert(name != NULL, "method name is null");
5535 char buf[fixed_buffer_size];
5536 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5537 unsigned int length = name->utf8_length();
5538 bool legal = false;
5539
5540 if (length > 0) {
5541 if (bytes[0] == '<') {
5542 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5543 legal = true;
5544 }
5545 } else if (_major_version < JAVA_1_5_VERSION) {
5546 const char* p;
5547 p = skip_over_field_name(bytes, false, length);
5548 legal = (p != NULL) && ((p - bytes) == (int)length);
5549 } else {
5550 // 4881221: relax the constraints based on JSR202 spec
5551 legal = verify_unqualified_name(bytes, length, LegalMethod);
5552 }
5553 }
5554
5555 if (!legal) {
5556 ResourceMark rm(THREAD);
5557 assert(_class_name != NULL, "invariant");
5558 Exceptions::fthrow(
5559 THREAD_AND_LOCATION,
5560 vmSymbols::java_lang_ClassFormatError(),
5561 "Illegal method name \"%s\" in class %s", bytes,
5562 _class_name->as_C_string()
5563 );
5564 return;
5565 }
5566 }
5567
5568
5569 // Checks if signature is a legal field signature.
5570 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5571 const Symbol* signature,
5572 TRAPS) const {
5573 if (!_need_verify) { return; }
5574
5575 char buf[fixed_buffer_size];
5576 const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5577 const unsigned int length = signature->utf8_length();
5578 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5579
5580 if (p == NULL || (p - bytes) != (int)length) {
5581 throwIllegalSignature("Field", name, signature, CHECK);
5582 }
5583 }
5584
5585 // Checks if signature is a legal method signature.
5586 // Returns number of parameters
5587 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5588 const Symbol* signature,
5589 TRAPS) const {
5590 if (!_need_verify) {
5591 // make sure caller's args_size will be less than 0 even for non-static
5592 // method so it will be recomputed in compute_size_of_parameters().
5593 return -2;
5594 }
5595
5596 // Class initializers cannot have args for class format version >= 51.
5597 if (name == vmSymbols::class_initializer_name() &&
5598 signature != vmSymbols::void_method_signature() &&
5599 _major_version >= JAVA_7_VERSION) {
5600 throwIllegalSignature("Method", name, signature, CHECK_0);
5601 return 0;
5602 }
5603
5604 unsigned int args_size = 0;
5605 char buf[fixed_buffer_size];
5606 const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5607 unsigned int length = signature->utf8_length();
5608 const char* nextp;
5609
5610 // The first character must be a '('
5611 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5612 length--;
5613 // Skip over legal field signatures
5614 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5615 while ((length > 0) && (nextp != NULL)) {
5616 args_size++;
5617 if (p[0] == 'J' || p[0] == 'D') {
5618 args_size++;
5619 }
5620 length -= nextp - p;
5621 p = nextp;
5622 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5623 }
5624 // The first non-signature thing better be a ')'
5625 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5626 length--;
5627 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5628 // All internal methods must return void
5629 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5630 return args_size;
5631 }
5632 } else {
5633 // Now we better just have a return value
5634 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5635 if (nextp && ((int)length == (nextp - p))) {
5636 return args_size;
5637 }
5638 }
5639 }
5640 }
5641 // Report error
5642 throwIllegalSignature("Method", name, signature, CHECK_0);
5643 return 0;
5644 }
5645
5646 int ClassFileParser::static_field_size() const {
5647 assert(_field_info != NULL, "invariant");
5648 return _field_info->static_field_size;
5649 }
5650
5651 int ClassFileParser::total_oop_map_count() const {
5652 assert(_field_info != NULL, "invariant");
5653 return _field_info->oop_map_blocks->nonstatic_oop_map_count;
5654 }
5655
5656 jint ClassFileParser::layout_size() const {
5657 assert(_field_info != NULL, "invariant");
5658 return _field_info->instance_size;
5659 }
5660
5661 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5662 const Array<Method*>* methods) {
5663 assert(ik != NULL, "invariant");
5664 assert(methods != NULL, "invariant");
5665
5666 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5667 // (We used to do this lazily, but now we query it in Rewriter,
5668 // which is eagerly done for every method, so we might as well do it now,
5669 // when everything is fresh in memory.)
5670 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5671
5672 if (klass_id != vmSymbols::NO_SID) {
5673 for (int j = 0; j < methods->length(); ++j) {
5674 Method* method = methods->at(j);
5675 method->init_intrinsic_id();
5676
5677 if (CheckIntrinsics) {
5678 // Check if an intrinsic is defined for method 'method',
5679 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5680 if (method->intrinsic_id() != vmIntrinsics::_none &&
5681 !method->intrinsic_candidate()) {
5682 tty->print("Compiler intrinsic is defined for method [%s], "
5683 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5684 method->name_and_sig_as_C_string(),
5685 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5686 );
5687 tty->cr();
5688 DEBUG_ONLY(vm_exit(1));
5689 }
5690 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5691 // but there is no intrinsic available for it.
5692 if (method->intrinsic_candidate() &&
5693 method->intrinsic_id() == vmIntrinsics::_none) {
5694 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5695 "but no compiler intrinsic is defined for the method.%s",
5696 method->name_and_sig_as_C_string(),
5697 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5698 );
5699 tty->cr();
5700 DEBUG_ONLY(vm_exit(1));
5701 }
5702 }
5703 } // end for
5704
5705 #ifdef ASSERT
5706 if (CheckIntrinsics) {
5707 // Check for orphan methods in the current class. A method m
5708 // of a class C is orphan if an intrinsic is defined for method m,
5709 // but class C does not declare m.
5710 // The check is potentially expensive, therefore it is available
5711 // only in debug builds.
5712
5713 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5714 if (vmIntrinsics::_compiledLambdaForm == id) {
5715 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5716 // generated for the JVM from a LambdaForm and therefore no method
5717 // is defined for it.
5718 continue;
5719 }
5720
5721 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5722 // Check if the current class contains a method with the same
5723 // name, flags, signature.
5724 bool match = false;
5725 for (int j = 0; j < methods->length(); ++j) {
5726 const Method* method = methods->at(j);
5727 if (method->intrinsic_id() == id) {
5728 match = true;
5729 break;
5730 }
5731 }
5732
5733 if (!match) {
5734 char buf[1000];
5735 tty->print("Compiler intrinsic is defined for method [%s], "
5736 "but the method is not available in class [%s].%s",
5737 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5738 buf, sizeof(buf)),
5739 ik->name()->as_C_string(),
5740 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5741 );
5742 tty->cr();
5743 DEBUG_ONLY(vm_exit(1));
5744 }
5745 }
5746 } // end for
5747 } // CheckIntrinsics
5748 #endif // ASSERT
5749 }
5750 }
5751
5752 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5753 if (_klass != NULL) {
5754 return _klass;
5755 }
5756
5757 InstanceKlass* const ik =
5758 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5759
5760 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5761
5762 assert(_klass == ik, "invariant");
5763
5764 ik->set_has_passed_fingerprint_check(false);
5765 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5766 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5767 if (aot_fp != 0 && aot_fp == _stream->compute_fingerprint()) {
5768 // This class matches with a class saved in an AOT library
5769 ik->set_has_passed_fingerprint_check(true);
5770 } else {
5771 ResourceMark rm;
5772 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5773 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5774 }
5775 }
5776
5777 if (ik->is_value()) {
5778 ValueKlass* vk = ValueKlass::cast(ik);
5779 oop val = ik->allocate_instance(CHECK_NULL);
5780 vk->set_default_value(val);
5781 }
5782
5783 return ik;
5784 }
5785
5786 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5787 assert(ik != NULL, "invariant");
5788
5789 // Set name and CLD before adding to CLD
5790 ik->set_class_loader_data(_loader_data);
5791 ik->set_name(_class_name);
5792
5793 // Add all classes to our internal class loader list here,
5794 // including classes in the bootstrap (NULL) class loader.
5795 const bool publicize = !is_internal();
5796
5797 _loader_data->add_class(ik, publicize);
5798
5799 set_klass_to_deallocate(ik);
5800
5801 assert(_field_info != NULL, "invariant");
5802 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5803 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->nonstatic_oop_map_count,
5804 "sanity");
5805
5806 assert(ik->is_instance_klass(), "sanity");
5807 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5808
5809 // Fill in information already parsed
5810 ik->set_should_verify_class(_need_verify);
5811
5812 // Not yet: supers are done below to support the new subtype-checking fields
5813 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5814 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5815 assert(_fac != NULL, "invariant");
5816 ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_FLATTENABLE]);
5817
5818 // this transfers ownership of a lot of arrays from
5819 // the parser onto the InstanceKlass*
5820 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5821
5822 // note that is not safe to use the fields in the parser from this point on
5823 assert(NULL == _cp, "invariant");
5824 assert(NULL == _fields, "invariant");
5825 assert(NULL == _methods, "invariant");
5826 assert(NULL == _inner_classes, "invariant");
5827 assert(NULL == _local_interfaces, "invariant");
5828 assert(NULL == _combined_annotations, "invariant");
5829
5830 if (_has_final_method) {
5831 ik->set_has_final_method();
5832 }
5833
5834 ik->copy_method_ordering(_method_ordering, CHECK);
5835 // The InstanceKlass::_methods_jmethod_ids cache
5836 // is managed on the assumption that the initial cache
5837 // size is equal to the number of methods in the class. If
5838 // that changes, then InstanceKlass::idnum_can_increment()
5839 // has to be changed accordingly.
5840 ik->set_initial_method_idnum(ik->methods()->length());
5841
5842 ik->set_this_class_index(_this_class_index);
5843
5844 if (is_anonymous()) {
5845 // _this_class_index is a CONSTANT_Class entry that refers to this
5846 // anonymous class itself. If this class needs to refer to its own methods or
5847 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5848 // _this_class_index. However, because this class is anonymous (it's
5849 // not stored in SystemDictionary), _this_class_index cannot be resolved
5850 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5851 // Therefore, we must eagerly resolve _this_class_index now.
5852 ik->constants()->klass_at_put(_this_class_index, ik);
5853 }
5854
5855 ik->set_minor_version(_minor_version);
5856 ik->set_major_version(_major_version);
5857 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5858 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5859
5860 if (_host_klass != NULL) {
5861 assert (ik->is_anonymous(), "should be the same");
5862 ik->set_host_klass(_host_klass);
5863 }
5864
5865 // Set PackageEntry for this_klass
5866 oop cl = ik->class_loader();
5867 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5868 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5869 ik->set_package(cld, CHECK);
5870
5871 const Array<Method*>* const methods = ik->methods();
5872 assert(methods != NULL, "invariant");
5873 const int methods_len = methods->length();
5874
5875 check_methods_for_intrinsics(ik, methods);
5876
5877 // Fill in field values obtained by parse_classfile_attributes
5878 if (_parsed_annotations->has_any_annotations()) {
5879 _parsed_annotations->apply_to(ik);
5880 }
5881
5882 apply_parsed_class_attributes(ik);
5883
5884 // Miranda methods
5885 if ((_num_miranda_methods > 0) ||
5886 // if this class introduced new miranda methods or
5887 (_super_klass != NULL && _super_klass->has_miranda_methods())
5888 // super class exists and this class inherited miranda methods
5889 ) {
5890 ik->set_has_miranda_methods(); // then set a flag
5891 }
5892
5893 // Fill in information needed to compute superclasses.
5894 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5895 ik->set_transitive_interfaces(_transitive_interfaces);
5896 _transitive_interfaces = NULL;
5897
5898 // Initialize itable offset tables
5899 klassItable::setup_itable_offset_table(ik);
5900
5901 // Compute transitive closure of interfaces this class implements
5902 // Do final class setup
5903 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5904 if (oop_map_blocks->nonstatic_oop_map_count > 0) {
5905 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5906 }
5907
5908 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5909 set_precomputed_flags(ik, CHECK);
5910
5911 // check if this class can access its super class
5912 check_super_class_access(ik, CHECK);
5913
5914 // check if this class can access its superinterfaces
5915 check_super_interface_access(ik, CHECK);
5916
5917 // check if this class overrides any final method
5918 check_final_method_override(ik, CHECK);
5919
5920 // reject static interface methods prior to Java 8
5921 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5922 check_illegal_static_method(ik, CHECK);
5923 }
5924
5925 // Obtain this_klass' module entry
5926 ModuleEntry* module_entry = ik->module();
5927 assert(module_entry != NULL, "module_entry should always be set");
5928
5929 // Obtain java.lang.Module
5930 Handle module_handle(THREAD, module_entry->module());
5931
5932 // Allocate mirror and initialize static fields
5933 // The create_mirror() call will also call compute_modifiers()
5934 java_lang_Class::create_mirror(ik,
5935 Handle(THREAD, _loader_data->class_loader()),
5936 module_handle,
5937 _protection_domain,
5938 CHECK);
5939
5940 assert(_all_mirandas != NULL, "invariant");
5941
5942 // Generate any default methods - default methods are public interface methods
5943 // that have a default implementation. This is new with Java 8.
5944 if (_has_nonstatic_concrete_methods) {
5945 DefaultMethods::generate_default_methods(ik,
5946 _all_mirandas,
5947 CHECK);
5948 }
5949
5950 if (is_value_type()) {
5951 ValueKlass* vk = ValueKlass::cast(ik);
5952 vk->set_if_bufferable();
5953 vk->initialize_calling_convention();
5954 }
5955
5956 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5957 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5958 !module_entry->has_default_read_edges()) {
5959 if (!module_entry->set_has_default_read_edges()) {
5960 // We won a potential race
5961 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5962 }
5963 }
5964
5965 int nfields = ik->java_fields_count();
5966 if (ik->is_value()) nfields++;
5967 for(int i = 0; i < nfields; i++) {
5968 if (ik->field_access_flags(i) & JVM_ACC_FLATTENABLE) {
5969 Klass* klass = SystemDictionary::resolve_or_fail(ik->field_signature(i),
5970 Handle(THREAD, ik->class_loader()),
5971 Handle(THREAD, ik->protection_domain()), true, CHECK);
5972 assert(klass != NULL, "Sanity check");
5973 assert(klass->access_flags().is_value_type(), "Value type expected");
5974 ik->set_value_field_klass(i, klass);
5975 } else if (is_value_type() && ((ik->field_access_flags(i) & JVM_ACC_FIELD_INTERNAL) != 0)
5976 && ((ik->field_access_flags(i) & JVM_ACC_STATIC) != 0)) {
5977 ValueKlass::cast(ik)->set_default_value_offset(ik->field_offset(i));
5978 }
5979 }
5980
5981 // Update the loader_data graph.
5982 record_defined_class_dependencies(ik, CHECK);
5983
5984 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5985
5986 if (!is_internal()) {
5987 if (log_is_enabled(Info, class, load)) {
5988 ResourceMark rm;
5989 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5990 ik->print_class_load_logging(_loader_data, module_name, _stream);
5991 }
5992
5993 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5994 ik->major_version() != JAVA_MIN_SUPPORTED_VERSION &&
5995 log_is_enabled(Info, class, preview)) {
5996 ResourceMark rm;
5997 log_info(class, preview)("Loading preview feature type %s", ik->external_name());
5998 }
5999
6000 if (log_is_enabled(Debug, class, resolve)) {
6001 ResourceMark rm;
6002 // print out the superclass.
6003 const char * from = ik->external_name();
6004 if (ik->java_super() != NULL) {
6005 log_debug(class, resolve)("%s %s (super)",
6006 from,
6007 ik->java_super()->external_name());
6008 }
6009 // print out each of the interface classes referred to by this class.
6010 const Array<Klass*>* const local_interfaces = ik->local_interfaces();
6011 if (local_interfaces != NULL) {
6012 const int length = local_interfaces->length();
6013 for (int i = 0; i < length; i++) {
6014 const Klass* const k = local_interfaces->at(i);
6015 const char * to = k->external_name();
6016 log_debug(class, resolve)("%s %s (interface)", from, to);
6017 }
6018 }
6019 }
6020 }
6021
6022 JFR_ONLY(INIT_ID(ik);)
6023
6024 // If we reach here, all is well.
6025 // Now remove the InstanceKlass* from the _klass_to_deallocate field
6026 // in order for it to not be destroyed in the ClassFileParser destructor.
6027 set_klass_to_deallocate(NULL);
6028
6029 // it's official
6030 set_klass(ik);
6031
6032 debug_only(ik->verify();)
6033 }
6034
6035 // For an anonymous class that is in the unnamed package, move it to its host class's
6036 // package by prepending its host class's package name to its class name and setting
6037 // its _class_name field.
6038 void ClassFileParser::prepend_host_package_name(const InstanceKlass* host_klass, TRAPS) {
6039 ResourceMark rm(THREAD);
6040 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
6041 "Anonymous class should not be in a package");
6042 const char* host_pkg_name =
6043 ClassLoader::package_from_name(host_klass->name()->as_C_string(), NULL);
6044
6045 if (host_pkg_name != NULL) {
6046 size_t host_pkg_len = strlen(host_pkg_name);
6047 int class_name_len = _class_name->utf8_length();
6048 char* new_anon_name =
6049 NEW_RESOURCE_ARRAY(char, host_pkg_len + 1 + class_name_len);
6050 // Copy host package name and trailing /.
6051 strncpy(new_anon_name, host_pkg_name, host_pkg_len);
6052 new_anon_name[host_pkg_len] = '/';
6053 // Append anonymous class name. The anonymous class name can contain odd
6054 // characters. So, do a strncpy instead of using sprintf("%s...").
6055 strncpy(new_anon_name + host_pkg_len + 1, (char *)_class_name->base(), class_name_len);
6056
6057 // Create a symbol and update the anonymous class name.
6058 _class_name = SymbolTable::new_symbol(new_anon_name,
6059 (int)host_pkg_len + 1 + class_name_len,
6060 CHECK);
6061 }
6062 }
6063
6064 // If the host class and the anonymous class are in the same package then do
6065 // nothing. If the anonymous class is in the unnamed package then move it to its
6066 // host's package. If the classes are in different packages then throw an IAE
6067 // exception.
6068 void ClassFileParser::fix_anonymous_class_name(TRAPS) {
6069 assert(_host_klass != NULL, "Expected an anonymous class");
6070
6071 const jbyte* anon_last_slash = UTF8::strrchr(_class_name->base(),
6072 _class_name->utf8_length(), '/');
6073 if (anon_last_slash == NULL) { // Unnamed package
6074 prepend_host_package_name(_host_klass, CHECK);
6075 } else {
6076 if (!_host_klass->is_same_class_package(_host_klass->class_loader(), _class_name)) {
6077 ResourceMark rm(THREAD);
6078 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
6079 err_msg("Host class %s and anonymous class %s are in different packages",
6080 _host_klass->name()->as_C_string(), _class_name->as_C_string()));
6081 }
6082 }
6083 }
6084
6085 static bool relax_format_check_for(ClassLoaderData* loader_data) {
6086 bool trusted = (loader_data->is_the_null_class_loader_data() ||
6087 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
6088 bool need_verify =
6089 // verifyAll
6090 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
6091 // verifyRemote
6092 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
6093 return !need_verify;
6094 }
6095
6096 ClassFileParser::ClassFileParser(ClassFileStream* stream,
6097 Symbol* name,
6098 ClassLoaderData* loader_data,
6099 Handle protection_domain,
6100 const InstanceKlass* host_klass,
6101 GrowableArray<Handle>* cp_patches,
6102 Publicity pub_level,
6103 TRAPS) :
6104 _stream(stream),
6105 _requested_name(name),
6106 _loader_data(loader_data),
6107 _host_klass(host_klass),
6108 _cp_patches(cp_patches),
6109 _num_patched_klasses(0),
6110 _max_num_patched_klasses(0),
6111 _orig_cp_size(0),
6112 _first_patched_klass_resolved_index(0),
6113 _super_klass(),
6114 _cp(NULL),
6115 _fields(NULL),
6116 _methods(NULL),
6117 _inner_classes(NULL),
6118 _value_types(NULL),
6119 _local_interfaces(NULL),
6120 _transitive_interfaces(NULL),
6121 _combined_annotations(NULL),
6122 _annotations(NULL),
6123 _type_annotations(NULL),
6124 _fields_annotations(NULL),
6125 _fields_type_annotations(NULL),
6126 _klass(NULL),
6127 _klass_to_deallocate(NULL),
6128 _parsed_annotations(NULL),
6129 _fac(NULL),
6130 _field_info(NULL),
6131 _method_ordering(NULL),
6132 _all_mirandas(NULL),
6133 _vtable_size(0),
6134 _itable_size(0),
6135 _num_miranda_methods(0),
6136 _rt(REF_NONE),
6137 _protection_domain(protection_domain),
6138 _access_flags(),
6139 _pub_level(pub_level),
6140 _bad_constant_seen(0),
6141 _synthetic_flag(false),
6142 _sde_length(false),
6143 _sde_buffer(NULL),
6144 _sourcefile_index(0),
6145 _generic_signature_index(0),
6146 _major_version(0),
6147 _minor_version(0),
6148 _this_class_index(0),
6149 _super_class_index(0),
6150 _itfs_len(0),
6151 _java_fields_count(0),
6152 _need_verify(false),
6153 _relax_verify(false),
6154 _has_nonstatic_concrete_methods(false),
6155 _declares_nonstatic_concrete_methods(false),
6156 _has_final_method(false),
6157 _has_finalizer(false),
6158 _has_empty_finalizer(false),
6159 _has_vanilla_constructor(false),
6160 _max_bootstrap_specifier_index(-1),
6161 _has_flattenable_fields(false) {
6162
6163 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6164
6165 assert(THREAD->is_Java_thread(), "invariant");
6166 assert(_loader_data != NULL, "invariant");
6167 assert(stream != NULL, "invariant");
6168 assert(_stream != NULL, "invariant");
6169 assert(_stream->buffer() == _stream->current(), "invariant");
6170 assert(_class_name != NULL, "invariant");
6171 assert(0 == _access_flags.as_int(), "invariant");
6172
6173 // Figure out whether we can skip format checking (matching classic VM behavior)
6174 if (DumpSharedSpaces) {
6175 // verify == true means it's a 'remote' class (i.e., non-boot class)
6176 // Verification decision is based on BytecodeVerificationRemote flag
6177 // for those classes.
6178 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
6179 BytecodeVerificationLocal;
6180 }
6181 else {
6182 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
6183 stream->need_verify());
6184 }
6185 if (_cp_patches != NULL) {
6186 int len = _cp_patches->length();
6187 for (int i=0; i<len; i++) {
6188 if (has_cp_patch_at(i)) {
6189 Handle patch = cp_patch_at(i);
6190 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
6191 // We need to append the names of the patched classes to the end of the constant pool,
6192 // because a patched class may have a Utf8 name that's not already included in the
6193 // original constant pool. These class names are used when patch_constant_pool()
6194 // calls patch_class().
6195 //
6196 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
6197 // At this point, we don't know the tag for index i yet, because we haven't parsed the
6198 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
6199 _max_num_patched_klasses++;
6200 }
6201 }
6202 }
6203 }
6204
6205 // synch back verification state to stream
6206 stream->set_verify(_need_verify);
6207
6208 // Check if verification needs to be relaxed for this class file
6209 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
6210 _relax_verify = relax_format_check_for(_loader_data);
6211
6212 parse_stream(stream, CHECK);
6213
6214 post_process_parsed_stream(stream, _cp, CHECK);
6215 }
6216
6217 void ClassFileParser::clear_class_metadata() {
6218 // metadata created before the instance klass is created. Must be
6219 // deallocated if classfile parsing returns an error.
6220 _cp = NULL;
6221 _fields = NULL;
6222 _methods = NULL;
6223 _inner_classes = NULL;
6224 _local_interfaces = NULL;
6225 _combined_annotations = NULL;
6226 _annotations = _type_annotations = NULL;
6227 _fields_annotations = _fields_type_annotations = NULL;
6228 }
6229
6230 // Destructor to clean up
6231 ClassFileParser::~ClassFileParser() {
6232 if (_cp != NULL) {
6233 MetadataFactory::free_metadata(_loader_data, _cp);
6234 }
6235 if (_fields != NULL) {
6236 MetadataFactory::free_array<u2>(_loader_data, _fields);
6237 }
6238
6239 if (_methods != NULL) {
6240 // Free methods
6241 InstanceKlass::deallocate_methods(_loader_data, _methods);
6242 }
6243
6244 // beware of the Universe::empty_blah_array!!
6245 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6246 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6247 }
6248
6249 // Free interfaces
6250 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6251 _local_interfaces, _transitive_interfaces);
6252
6253 if (_combined_annotations != NULL) {
6254 // After all annotations arrays have been created, they are installed into the
6255 // Annotations object that will be assigned to the InstanceKlass being created.
6256
6257 // Deallocate the Annotations object and the installed annotations arrays.
6258 _combined_annotations->deallocate_contents(_loader_data);
6259
6260 // If the _combined_annotations pointer is non-NULL,
6261 // then the other annotations fields should have been cleared.
6262 assert(_annotations == NULL, "Should have been cleared");
6263 assert(_type_annotations == NULL, "Should have been cleared");
6264 assert(_fields_annotations == NULL, "Should have been cleared");
6265 assert(_fields_type_annotations == NULL, "Should have been cleared");
6266 } else {
6267 // If the annotations arrays were not installed into the Annotations object,
6268 // then they have to be deallocated explicitly.
6269 MetadataFactory::free_array<u1>(_loader_data, _annotations);
6270 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
6271 Annotations::free_contents(_loader_data, _fields_annotations);
6272 Annotations::free_contents(_loader_data, _fields_type_annotations);
6273 }
6274
6275 clear_class_metadata();
6276 _transitive_interfaces = NULL;
6277
6278 // deallocate the klass if already created. Don't directly deallocate, but add
6279 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6280 // at a safepoint.
6281 if (_klass_to_deallocate != NULL) {
6282 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6283 }
6284 }
6285
6286 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6287 TRAPS) {
6288
6289 assert(stream != NULL, "invariant");
6290 assert(_class_name != NULL, "invariant");
6291
6292 // BEGIN STREAM PARSING
6293 stream->guarantee_more(8, CHECK); // magic, major, minor
6294 // Magic value
6295 const u4 magic = stream->get_u4_fast();
6296 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6297 "Incompatible magic value %u in class file %s",
6298 magic, CHECK);
6299
6300 // Version numbers
6301 _minor_version = stream->get_u2_fast();
6302 _major_version = stream->get_u2_fast();
6303
6304 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) {
6305 ResourceMark rm;
6306 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
6307 _major_version, _minor_version, _class_name->as_C_string());
6308 Exceptions::fthrow(
6309 THREAD_AND_LOCATION,
6310 vmSymbols::java_lang_UnsupportedClassVersionError(),
6311 "Unsupported major.minor version for dump time %u.%u",
6312 _major_version,
6313 _minor_version);
6314 }
6315
6316 // Check version numbers - we check this even with verifier off
6317 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6318
6319 stream->guarantee_more(3, CHECK); // length, first cp tag
6320 u2 cp_size = stream->get_u2_fast();
6321
6322 guarantee_property(
6323 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6324 cp_size, CHECK);
6325
6326 _orig_cp_size = cp_size;
6327 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6328 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6329 }
6330 cp_size += _max_num_patched_klasses;
6331
6332 _cp = ConstantPool::allocate(_loader_data,
6333 cp_size,
6334 CHECK);
6335
6336 ConstantPool* const cp = _cp;
6337
6338 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6339
6340 assert(cp_size == (const u2)cp->length(), "invariant");
6341
6342 // ACCESS FLAGS
6343 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6344
6345 jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
6346 // JVM_ACC_MODULE is defined in JDK-9 and later.
6347 if (_major_version >= JAVA_9_VERSION) {
6348 recognized_modifiers |= JVM_ACC_MODULE;
6349 }
6350 // JVM_ACC_VALUE is defined for class file version 55 and later
6351 if (supports_value_types()) {
6352 recognized_modifiers |= JVM_ACC_VALUE;
6353 }
6354
6355 // Access flags
6356 jint flags = stream->get_u2_fast() & recognized_modifiers;
6357
6358 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6359 // Set abstract bit for old class files for backward compatibility
6360 flags |= JVM_ACC_ABSTRACT;
6361 }
6362
6363 verify_legal_class_modifiers(flags, CHECK);
6364
6365 short bad_constant = class_bad_constant_seen();
6366 if (bad_constant != 0) {
6367 // Do not throw CFE until after the access_flags are checked because if
6368 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6369 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6370 }
6371
6372 _access_flags.set_flags(flags);
6373
6374 // This class and superclass
6375 _this_class_index = stream->get_u2_fast();
6376 check_property(
6377 valid_cp_range(_this_class_index, cp_size) &&
6378 cp->tag_at(_this_class_index).is_unresolved_klass(),
6379 "Invalid this class index %u in constant pool in class file %s",
6380 _this_class_index, CHECK);
6381
6382 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6383 assert(class_name_in_cp != NULL, "class_name can't be null");
6384
6385 // Update _class_name which could be null previously
6386 // to reflect the name in the constant pool
6387 _class_name = class_name_in_cp;
6388
6389 // Don't need to check whether this class name is legal or not.
6390 // It has been checked when constant pool is parsed.
6391 // However, make sure it is not an array type.
6392 if (_need_verify) {
6393 guarantee_property(_class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
6394 "Bad class name in class file %s",
6395 CHECK);
6396 }
6397
6398 // Checks if name in class file matches requested name
6399 if (_requested_name != NULL && _requested_name != _class_name) {
6400 ResourceMark rm(THREAD);
6401 Exceptions::fthrow(
6402 THREAD_AND_LOCATION,
6403 vmSymbols::java_lang_NoClassDefFoundError(),
6404 "%s (wrong name: %s)",
6405 _class_name->as_C_string(),
6406 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6407 );
6408 return;
6409 }
6410
6411 // if this is an anonymous class fix up its name if it's in the unnamed
6412 // package. Otherwise, throw IAE if it is in a different package than
6413 // its host class.
6414 if (_host_klass != NULL) {
6415 fix_anonymous_class_name(CHECK);
6416 }
6417
6418 // Verification prevents us from creating names with dots in them, this
6419 // asserts that that's the case.
6420 assert(is_internal_format(_class_name), "external class name format used internally");
6421
6422 if (!is_internal()) {
6423 LogTarget(Debug, class, preorder) lt;
6424 if (lt.is_enabled()){
6425 ResourceMark rm(THREAD);
6426 LogStream ls(lt);
6427 ls.print("%s", _class_name->as_klass_external_name());
6428 if (stream->source() != NULL) {
6429 ls.print(" source: %s", stream->source());
6430 }
6431 ls.cr();
6432 }
6433
6434 #if INCLUDE_CDS
6435 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6436 if (!ClassLoader::has_jrt_entry()) {
6437 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6438 DumpLoadedClassList = NULL;
6439 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6440 _host_klass == NULL) {
6441 // Only dump the classes that can be stored into CDS archive.
6442 // Anonymous classes such as generated LambdaForm classes are also not included.
6443 oop class_loader = _loader_data->class_loader();
6444 ResourceMark rm(THREAD);
6445 bool skip = false;
6446 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6447 // For the boot and platform class loaders, skip classes that are not found in the
6448 // java runtime image, such as those found in the --patch-module entries.
6449 // These classes can't be loaded from the archive during runtime.
6450 if (!ClassLoader::is_modules_image(stream->source()) && strncmp(stream->source(), "jrt:", 4) != 0) {
6451 skip = true;
6452 }
6453
6454 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6455 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6456 // as they can be loaded from the archive during runtime.
6457 skip = false;
6458 }
6459 }
6460 if (skip) {
6461 tty->print_cr("skip writing class %s from source %s to classlist file",
6462 _class_name->as_C_string(), stream->source());
6463 } else {
6464 classlist_file->print_cr("%s", _class_name->as_C_string());
6465 classlist_file->flush();
6466 }
6467 }
6468 }
6469 #endif
6470 }
6471
6472 // SUPERKLASS
6473 _super_class_index = stream->get_u2_fast();
6474 _super_klass = parse_super_class(cp,
6475 _super_class_index,
6476 _need_verify,
6477 CHECK);
6478
6479 // Interfaces
6480 _itfs_len = stream->get_u2_fast();
6481 parse_interfaces(stream,
6482 _itfs_len,
6483 cp,
6484 &_has_nonstatic_concrete_methods,
6485 CHECK);
6486
6487 assert(_local_interfaces != NULL, "invariant");
6488
6489 // Fields (offsets are filled in later)
6490 _fac = new FieldAllocationCount();
6491 parse_fields(stream,
6492 _access_flags.is_interface(),
6493 _access_flags.is_value_type(),
6494 _fac,
6495 cp,
6496 cp_size,
6497 &_java_fields_count,
6498 CHECK);
6499
6500 assert(_fields != NULL, "invariant");
6501
6502 // Methods
6503 AccessFlags promoted_flags;
6504 parse_methods(stream,
6505 _access_flags.is_interface(),
6506 _access_flags.is_value_type(),
6507 &promoted_flags,
6508 &_has_final_method,
6509 &_declares_nonstatic_concrete_methods,
6510 CHECK);
6511
6512 assert(_methods != NULL, "invariant");
6513
6514 // promote flags from parse_methods() to the klass' flags
6515 _access_flags.add_promoted_flags(promoted_flags.as_int());
6516
6517 if (_declares_nonstatic_concrete_methods) {
6518 _has_nonstatic_concrete_methods = true;
6519 }
6520
6521 // Additional attributes/annotations
6522 _parsed_annotations = new ClassAnnotationCollector();
6523 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6524
6525 assert(_inner_classes != NULL, "invariant");
6526
6527 // Finalize the Annotations metadata object,
6528 // now that all annotation arrays have been created.
6529 create_combined_annotations(CHECK);
6530
6531 // Make sure this is the end of class file stream
6532 guarantee_property(stream->at_eos(),
6533 "Extra bytes at the end of class file %s",
6534 CHECK);
6535
6536 // all bytes in stream read and parsed
6537 }
6538
6539 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6540 ConstantPool* cp,
6541 TRAPS) {
6542 assert(stream != NULL, "invariant");
6543 assert(stream->at_eos(), "invariant");
6544 assert(cp != NULL, "invariant");
6545 assert(_loader_data != NULL, "invariant");
6546
6547 if (_class_name == vmSymbols::java_lang_Object()) {
6548 check_property(_local_interfaces == Universe::the_empty_klass_array(),
6549 "java.lang.Object cannot implement an interface in class file %s",
6550 CHECK);
6551 }
6552 // We check super class after class file is parsed and format is checked
6553 if (_super_class_index > 0 && NULL ==_super_klass) {
6554 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6555 if (_access_flags.is_interface()) {
6556 // Before attempting to resolve the superclass, check for class format
6557 // errors not checked yet.
6558 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6559 "Interfaces must have java.lang.Object as superclass in class file %s",
6560 CHECK);
6561 }
6562 Handle loader(THREAD, _loader_data->class_loader());
6563 _super_klass = (const InstanceKlass*)
6564 SystemDictionary::resolve_super_or_fail(_class_name,
6565 super_class_name,
6566 loader,
6567 _protection_domain,
6568 true,
6569 CHECK);
6570 }
6571
6572 if (_super_klass != NULL) {
6573 if (_super_klass->has_nonstatic_concrete_methods()) {
6574 _has_nonstatic_concrete_methods = true;
6575 }
6576
6577 if (_super_klass->is_interface()) {
6578 ResourceMark rm(THREAD);
6579 Exceptions::fthrow(
6580 THREAD_AND_LOCATION,
6581 vmSymbols::java_lang_IncompatibleClassChangeError(),
6582 "class %s has interface %s as super class",
6583 _class_name->as_klass_external_name(),
6584 _super_klass->external_name()
6585 );
6586 return;
6587 }
6588
6589 // For a value class, only java/lang/Object is an acceptable super class
6590 if (_access_flags.get_flags() & JVM_ACC_VALUE) {
6591 guarantee_property(_super_klass->name() == vmSymbols::java_lang_Object(),
6592 "Value type must have java.lang.Object as superclass in class file %s",
6593 CHECK);
6594 }
6595
6596 // Make sure super class is not final
6597 if (_super_klass->is_final()) {
6598 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6599 }
6600 }
6601
6602 // Compute the transitive list of all unique interfaces implemented by this class
6603 _transitive_interfaces =
6604 compute_transitive_interfaces(_super_klass,
6605 _local_interfaces,
6606 _loader_data,
6607 CHECK);
6608
6609 assert(_transitive_interfaces != NULL, "invariant");
6610
6611 // sort methods
6612 _method_ordering = sort_methods(_methods);
6613
6614 _all_mirandas = new GrowableArray<Method*>(20);
6615
6616 Handle loader(THREAD, _loader_data->class_loader());
6617 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6618 &_num_miranda_methods,
6619 _all_mirandas,
6620 _super_klass,
6621 _methods,
6622 _access_flags,
6623 _major_version,
6624 loader,
6625 _class_name,
6626 _local_interfaces,
6627 CHECK);
6628
6629 // Size of Java itable (in words)
6630 _itable_size = _access_flags.is_interface() ? 0 :
6631 klassItable::compute_itable_size(_transitive_interfaces);
6632
6633 assert(_fac != NULL, "invariant");
6634 assert(_parsed_annotations != NULL, "invariant");
6635
6636 _field_info = new FieldLayoutInfo();
6637 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6638
6639 // Compute reference typ
6640 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6641
6642 }
6643
6644 void ClassFileParser::set_klass(InstanceKlass* klass) {
6645
6646 #ifdef ASSERT
6647 if (klass != NULL) {
6648 assert(NULL == _klass, "leaking?");
6649 }
6650 #endif
6651
6652 _klass = klass;
6653 }
6654
6655 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6656
6657 #ifdef ASSERT
6658 if (klass != NULL) {
6659 assert(NULL == _klass_to_deallocate, "leaking?");
6660 }
6661 #endif
6662
6663 _klass_to_deallocate = klass;
6664 }
6665
6666 // Caller responsible for ResourceMark
6667 // clone stream with rewound position
6668 const ClassFileStream* ClassFileParser::clone_stream() const {
6669 assert(_stream != NULL, "invariant");
6670
6671 return _stream->clone();
6672 }
6673
6674 // ----------------------------------------------------------------------------
6675 // debugging
6676
6677 #ifdef ASSERT
6678
6679 // return true if class_name contains no '.' (internal format is '/')
6680 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6681 if (class_name != NULL) {
6682 ResourceMark rm;
6683 char* name = class_name->as_C_string();
6684 return strchr(name, '.') == NULL;
6685 } else {
6686 return true;
6687 }
6688 }
6689
6690 #endif