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 // Ignore ValueTypes attribute unless value type support is enabled.
3490 if (supports_value_types()) {
3491 // Check for ValueTypes tag
3492 if (parsed_value_types_attribute) {
3493 classfile_parse_error("Multiple ValueTypes attributes in class file %s", CHECK);
3494 } else {
3495 parsed_value_types_attribute = true;
3496 }
3497 value_types_attribute_start = cfs->current();
3498 value_types_attribute_length = attribute_length;
3499 }
3500 cfs->skip_u1(attribute_length, CHECK);
3501 } else if (tag == vmSymbols::tag_synthetic()) {
3502 // Check for Synthetic tag
3503 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3504 if (attribute_length != 0) {
3505 classfile_parse_error(
3506 "Invalid Synthetic classfile attribute length %u in class file %s",
3507 attribute_length, CHECK);
3508 }
3509 parse_classfile_synthetic_attribute(CHECK);
3510 } else if (tag == vmSymbols::tag_deprecated()) {
3511 // Check for Deprecatd tag - 4276120
3512 if (attribute_length != 0) {
3513 classfile_parse_error(
3514 "Invalid Deprecated classfile attribute length %u in class file %s",
3515 attribute_length, CHECK);
3516 }
3517 } else if (_major_version >= JAVA_1_5_VERSION) {
3518 if (tag == vmSymbols::tag_signature()) {
3519 if (_generic_signature_index != 0) {
3520 classfile_parse_error(
3521 "Multiple Signature attributes in class file %s", CHECK);
3522 }
3523 if (attribute_length != 2) {
3524 classfile_parse_error(
3525 "Wrong Signature attribute length %u in class file %s",
3526 attribute_length, CHECK);
3527 }
3528 parse_classfile_signature_attribute(cfs, CHECK);
3529 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3530 if (runtime_visible_annotations != NULL) {
3531 classfile_parse_error(
3532 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3533 }
3534 runtime_visible_annotations_length = attribute_length;
3535 runtime_visible_annotations = cfs->current();
3536 assert(runtime_visible_annotations != NULL, "null visible annotations");
3537 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3538 parse_annotations(cp,
3539 runtime_visible_annotations,
3540 runtime_visible_annotations_length,
3541 parsed_annotations,
3542 _loader_data,
3543 CHECK);
3544 cfs->skip_u1_fast(runtime_visible_annotations_length);
3545 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3546 if (runtime_invisible_annotations_exists) {
3547 classfile_parse_error(
3548 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3549 }
3550 runtime_invisible_annotations_exists = true;
3551 if (PreserveAllAnnotations) {
3552 runtime_invisible_annotations_length = attribute_length;
3553 runtime_invisible_annotations = cfs->current();
3554 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3555 }
3556 cfs->skip_u1(attribute_length, CHECK);
3557 } else if (tag == vmSymbols::tag_enclosing_method()) {
3558 if (parsed_enclosingmethod_attribute) {
3559 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3560 } else {
3561 parsed_enclosingmethod_attribute = true;
3562 }
3563 guarantee_property(attribute_length == 4,
3564 "Wrong EnclosingMethod attribute length %u in class file %s",
3565 attribute_length, CHECK);
3566 cfs->guarantee_more(4, CHECK); // class_index, method_index
3567 enclosing_method_class_index = cfs->get_u2_fast();
3568 enclosing_method_method_index = cfs->get_u2_fast();
3569 if (enclosing_method_class_index == 0) {
3570 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3571 }
3572 // Validate the constant pool indices and types
3573 check_property(valid_klass_reference_at(enclosing_method_class_index),
3574 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3575 if (enclosing_method_method_index != 0 &&
3576 (!cp->is_within_bounds(enclosing_method_method_index) ||
3577 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3578 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3579 }
3580 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3581 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3582 if (parsed_bootstrap_methods_attribute) {
3583 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3584 }
3585 parsed_bootstrap_methods_attribute = true;
3586 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3587 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3588 if (runtime_visible_type_annotations != NULL) {
3589 classfile_parse_error(
3590 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3591 }
3592 runtime_visible_type_annotations_length = attribute_length;
3593 runtime_visible_type_annotations = cfs->current();
3594 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3595 // No need for the VM to parse Type annotations
3596 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3597 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3598 if (runtime_invisible_type_annotations_exists) {
3599 classfile_parse_error(
3600 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3601 } else {
3602 runtime_invisible_type_annotations_exists = true;
3603 }
3604 if (PreserveAllAnnotations) {
3605 runtime_invisible_type_annotations_length = attribute_length;
3606 runtime_invisible_type_annotations = cfs->current();
3607 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3608 }
3609 cfs->skip_u1(attribute_length, CHECK);
3610 } else {
3611 // Unknown attribute
3612 cfs->skip_u1(attribute_length, CHECK);
3613 }
3614 } else {
3615 // Unknown attribute
3616 cfs->skip_u1(attribute_length, CHECK);
3617 }
3618 }
3619 _annotations = assemble_annotations(runtime_visible_annotations,
3620 runtime_visible_annotations_length,
3621 runtime_invisible_annotations,
3622 runtime_invisible_annotations_length,
3623 CHECK);
3624 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3625 runtime_visible_type_annotations_length,
3626 runtime_invisible_type_annotations,
3627 runtime_invisible_type_annotations_length,
3628 CHECK);
3629
3630 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3631 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3632 cfs,
3633 inner_classes_attribute_start,
3634 parsed_innerclasses_attribute,
3635 enclosing_method_class_index,
3636 enclosing_method_method_index,
3637 CHECK);
3638 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3639 guarantee_property(
3640 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3641 "Wrong InnerClasses attribute length in class file %s", CHECK);
3642 }
3643 }
3644
3645 if (parsed_value_types_attribute) {
3646 parse_value_types_attribute(cfs, value_types_attribute_start, CHECK);
3647 }
3648
3649 if (_max_bootstrap_specifier_index >= 0) {
3650 guarantee_property(parsed_bootstrap_methods_attribute,
3651 "Missing BootstrapMethods attribute in class file %s", CHECK);
3652 }
3653 }
3654
3655 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3656 assert(k != NULL, "invariant");
3657
3658 if (_synthetic_flag)
3659 k->set_is_synthetic();
3660 if (_sourcefile_index != 0) {
3661 k->set_source_file_name_index(_sourcefile_index);
3662 }
3663 if (_generic_signature_index != 0) {
3664 k->set_generic_signature_index(_generic_signature_index);
3665 }
3666 if (_sde_buffer != NULL) {
3667 k->set_source_debug_extension(_sde_buffer, _sde_length);
3668 }
3669 }
3670
3671 // Create the Annotations object that will
3672 // hold the annotations array for the Klass.
3673 void ClassFileParser::create_combined_annotations(TRAPS) {
3674 if (_annotations == NULL &&
3675 _type_annotations == NULL &&
3676 _fields_annotations == NULL &&
3677 _fields_type_annotations == NULL) {
3678 // Don't create the Annotations object unnecessarily.
3679 return;
3680 }
3681
3682 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3683 annotations->set_class_annotations(_annotations);
3684 annotations->set_class_type_annotations(_type_annotations);
3685 annotations->set_fields_annotations(_fields_annotations);
3686 annotations->set_fields_type_annotations(_fields_type_annotations);
3687
3688 // This is the Annotations object that will be
3689 // assigned to InstanceKlass being constructed.
3690 _combined_annotations = annotations;
3691
3692 // The annotations arrays below has been transfered the
3693 // _combined_annotations so these fields can now be cleared.
3694 _annotations = NULL;
3695 _type_annotations = NULL;
3696 _fields_annotations = NULL;
3697 _fields_type_annotations = NULL;
3698 }
3699
3700 // Transfer ownership of metadata allocated to the InstanceKlass.
3701 void ClassFileParser::apply_parsed_class_metadata(
3702 InstanceKlass* this_klass,
3703 int java_fields_count, TRAPS) {
3704 assert(this_klass != NULL, "invariant");
3705
3706 _cp->set_pool_holder(this_klass);
3707 this_klass->set_constants(_cp);
3708 this_klass->set_fields(_fields, java_fields_count);
3709 this_klass->set_methods(_methods);
3710 this_klass->set_inner_classes(_inner_classes);
3711 this_klass->set_value_types(_value_types);
3712 this_klass->set_local_interfaces(_local_interfaces);
3713 this_klass->set_annotations(_combined_annotations);
3714 // Delay the setting of _transitive_interfaces until after initialize_supers() in
3715 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with
3716 // its _super. If an OOM occurs while loading the current klass, its _super field
3717 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3718 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3719 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3720
3721 // Clear out these fields so they don't get deallocated by the destructor
3722 clear_class_metadata();
3723 }
3724
3725 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3726 int runtime_visible_annotations_length,
3727 const u1* const runtime_invisible_annotations,
3728 int runtime_invisible_annotations_length,
3729 TRAPS) {
3730 AnnotationArray* annotations = NULL;
3731 if (runtime_visible_annotations != NULL ||
3732 runtime_invisible_annotations != NULL) {
3733 annotations = MetadataFactory::new_array<u1>(_loader_data,
3734 runtime_visible_annotations_length +
3735 runtime_invisible_annotations_length,
3736 CHECK_(annotations));
3737 if (runtime_visible_annotations != NULL) {
3738 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3739 annotations->at_put(i, runtime_visible_annotations[i]);
3740 }
3741 }
3742 if (runtime_invisible_annotations != NULL) {
3743 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3744 int append = runtime_visible_annotations_length+i;
3745 annotations->at_put(append, runtime_invisible_annotations[i]);
3746 }
3747 }
3748 }
3749 return annotations;
3750 }
3751
3752 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3753 const int super_class_index,
3754 const bool need_verify,
3755 TRAPS) {
3756 assert(cp != NULL, "invariant");
3757 const InstanceKlass* super_klass = NULL;
3758
3759 if (super_class_index == 0) {
3760 check_property(_class_name == vmSymbols::java_lang_Object()
3761 || (_access_flags.get_flags() & JVM_ACC_VALUE),
3762 "Invalid superclass index %u in class file %s",
3763 super_class_index,
3764 CHECK_NULL);
3765 } else {
3766 check_property(valid_klass_reference_at(super_class_index),
3767 "Invalid superclass index %u in class file %s",
3768 super_class_index,
3769 CHECK_NULL);
3770 // The class name should be legal because it is checked when parsing constant pool.
3771 // However, make sure it is not an array type.
3772 bool is_array = false;
3773 if (cp->tag_at(super_class_index).is_klass()) {
3774 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3775 if (need_verify)
3776 is_array = super_klass->is_array_klass();
3777 } else if (need_verify) {
3778 is_array = (cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3779 }
3780 if (need_verify) {
3781 guarantee_property(!is_array,
3782 "Bad superclass name in class file %s", CHECK_NULL);
3783 }
3784 }
3785 return super_klass;
3786 }
3787
3788 #ifndef PRODUCT
3789 static void print_field_layout(const Symbol* name,
3790 Array<u2>* fields,
3791 const constantPoolHandle& cp,
3792 int instance_size,
3793 int instance_fields_start,
3794 int instance_fields_end,
3795 int static_fields_end) {
3796
3797 assert(name != NULL, "invariant");
3798
3799 tty->print("%s: field layout\n", name->as_klass_external_name());
3800 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3801 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3802 if (!fs.access_flags().is_static()) {
3803 tty->print(" @%3d \"%s\" %s\n",
3804 fs.offset(),
3805 fs.name()->as_klass_external_name(),
3806 fs.signature()->as_klass_external_name());
3807 }
3808 }
3809 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3810 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3811 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3812 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3813 if (fs.access_flags().is_static()) {
3814 tty->print(" @%3d \"%s\" %s\n",
3815 fs.offset(),
3816 fs.name()->as_klass_external_name(),
3817 fs.signature()->as_klass_external_name());
3818 }
3819 }
3820 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3821 tty->print("\n");
3822 }
3823 #endif
3824
3825 // Values needed for oopmap and InstanceKlass creation
3826 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3827 public:
3828 OopMapBlocksBuilder* oop_map_blocks;
3829 int instance_size;
3830 int nonstatic_field_size;
3831 int static_field_size;
3832 bool has_nonstatic_fields;
3833 };
3834
3835 // Utility to collect and compact oop maps during layout
3836 class ClassFileParser::OopMapBlocksBuilder : public ResourceObj {
3837 public:
3838 OopMapBlock* nonstatic_oop_maps;
3839 unsigned int nonstatic_oop_map_count;
3840 unsigned int max_nonstatic_oop_maps;
3841
3842 public:
3843 OopMapBlocksBuilder(unsigned int max_blocks, TRAPS) {
3844 max_nonstatic_oop_maps = max_blocks;
3845 nonstatic_oop_map_count = 0;
3846 if (max_blocks == 0) {
3847 nonstatic_oop_maps = NULL;
3848 } else {
3849 nonstatic_oop_maps = NEW_RESOURCE_ARRAY_IN_THREAD(
3850 THREAD, OopMapBlock, max_nonstatic_oop_maps);
3851 memset(nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3852 }
3853 }
3854
3855 OopMapBlock* last_oop_map() const {
3856 assert(nonstatic_oop_map_count > 0, "Has no oop maps");
3857 return nonstatic_oop_maps + (nonstatic_oop_map_count - 1);
3858 }
3859
3860 // addition of super oop maps
3861 void initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3862 assert(nof_blocks && nonstatic_oop_map_count == 0 &&
3863 nof_blocks <= max_nonstatic_oop_maps, "invariant");
3864
3865 memcpy(nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3866 nonstatic_oop_map_count += nof_blocks;
3867 }
3868
3869 // collection of oops
3870 void add(int offset, int count) {
3871 if (nonstatic_oop_map_count == 0) {
3872 nonstatic_oop_map_count++;
3873 }
3874 OopMapBlock* nonstatic_oop_map = last_oop_map();
3875 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
3876 nonstatic_oop_map->set_offset(offset);
3877 nonstatic_oop_map->set_count(count);
3878 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
3879 nonstatic_oop_map->increment_count(count);
3880 } else { // Need a new one...
3881 nonstatic_oop_map_count++;
3882 assert(nonstatic_oop_map_count <= max_nonstatic_oop_maps, "range check");
3883 nonstatic_oop_map = last_oop_map();
3884 nonstatic_oop_map->set_offset(offset);
3885 nonstatic_oop_map->set_count(count);
3886 }
3887 }
3888
3889 // general purpose copy, e.g. into allocated instanceKlass
3890 void copy(OopMapBlock* dst) {
3891 if (nonstatic_oop_map_count != 0) {
3892 memcpy(dst, nonstatic_oop_maps, sizeof(OopMapBlock) * nonstatic_oop_map_count);
3893 }
3894 }
3895
3896 // Sort and compact adjacent blocks
3897 void compact(TRAPS) {
3898 if (nonstatic_oop_map_count <= 1) {
3899 return;
3900 }
3901 /*
3902 * Since field layout sneeks in oops before values, we will be able to condense
3903 * blocks. There is potential to compact between super, own refs and values
3904 * containing refs.
3905 *
3906 * Currently compaction is slightly limited due to values being 8 byte aligned.
3907 * This may well change: FixMe if doesn't, the code below is fairly general purpose
3908 * and maybe it doesn't need to be.
3909 */
3910 qsort(nonstatic_oop_maps, nonstatic_oop_map_count, sizeof(OopMapBlock),
3911 (_sort_Fn)OopMapBlock::compare_offset);
3912 if (nonstatic_oop_map_count < 2) {
3913 return;
3914 }
3915
3916 //Make a temp copy, and iterate through and copy back into the orig
3917 ResourceMark rm(THREAD);
3918 OopMapBlock* oop_maps_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, OopMapBlock,
3919 nonstatic_oop_map_count);
3920 OopMapBlock* oop_maps_copy_end = oop_maps_copy + nonstatic_oop_map_count;
3921 copy(oop_maps_copy);
3922 OopMapBlock* nonstatic_oop_map = nonstatic_oop_maps;
3923 unsigned int new_count = 1;
3924 oop_maps_copy++;
3925 while(oop_maps_copy < oop_maps_copy_end) {
3926 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
3927 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
3928 nonstatic_oop_map->increment_count(oop_maps_copy->count());
3929 } else {
3930 nonstatic_oop_map++;
3931 new_count++;
3932 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
3933 nonstatic_oop_map->set_count(oop_maps_copy->count());
3934 }
3935 oop_maps_copy++;
3936 }
3937 assert(new_count <= nonstatic_oop_map_count, "end up with more maps after compact() ?");
3938 nonstatic_oop_map_count = new_count;
3939 }
3940
3941 void print_on(outputStream* st) const {
3942 st->print_cr(" OopMapBlocks: %3d /%3d", nonstatic_oop_map_count, max_nonstatic_oop_maps);
3943 if (nonstatic_oop_map_count > 0) {
3944 OopMapBlock* map = nonstatic_oop_maps;
3945 OopMapBlock* last_map = last_oop_map();
3946 assert(map <= last_map, "Last less than first");
3947 while (map <= last_map) {
3948 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
3949 map->offset() + map->offset_span() - heapOopSize, map->count());
3950 map++;
3951 }
3952 }
3953 }
3954
3955 void print_value_on(outputStream* st) const {
3956 print_on(st);
3957 }
3958
3959 };
3960
3961 void ClassFileParser::throwValueTypeLimitation(THREAD_AND_LOCATION_DECL,
3962 const char* msg,
3963 const Symbol* name,
3964 const Symbol* sig) const {
3965
3966 ResourceMark rm(THREAD);
3967 if (name == NULL || sig == NULL) {
3968 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
3969 vmSymbols::java_lang_ClassFormatError(),
3970 "class: %s - %s", _class_name->as_C_string(), msg);
3971 }
3972 else {
3973 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
3974 vmSymbols::java_lang_ClassFormatError(),
3975 "\"%s\" sig: \"%s\" class: %s - %s", name->as_C_string(), sig->as_C_string(),
3976 _class_name->as_C_string(), msg);
3977 }
3978 }
3979
3980 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3981 void ClassFileParser::layout_fields(ConstantPool* cp,
3982 const FieldAllocationCount* fac,
3983 const ClassAnnotationCollector* parsed_annotations,
3984 FieldLayoutInfo* info,
3985 TRAPS) {
3986
3987 assert(cp != NULL, "invariant");
3988
3989 // Field size and offset computation
3990 int nonstatic_field_size = _super_klass == NULL ? 0 :
3991 _super_klass->nonstatic_field_size();
3992 int next_nonstatic_valuetype_offset = 0;
3993 int first_nonstatic_valuetype_offset = 0;
3994
3995 // Fields that are value types are handled differently depending if they are static or not:
3996 // - static fields are oops
3997 // - non-static fields are embedded
3998
3999 // Count the contended fields by type.
4000 //
4001 // We ignore static fields, because @Contended is not supported for them.
4002 // The layout code below will also ignore the static fields.
4003 int nonstatic_contended_count = 0;
4004 FieldAllocationCount fac_contended;
4005 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4006 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4007 if (fs.is_contended()) {
4008 fac_contended.count[atype]++;
4009 if (!fs.access_flags().is_static()) {
4010 nonstatic_contended_count++;
4011 }
4012 }
4013 }
4014
4015
4016 // Calculate the starting byte offsets
4017 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
4018 // Value types in static fields are not embedded, they are handled with oops
4019 int next_static_double_offset = next_static_oop_offset +
4020 ((fac->count[STATIC_OOP] + fac->count[STATIC_FLATTENABLE]) * heapOopSize);
4021 if (fac->count[STATIC_DOUBLE]) {
4022 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
4023 }
4024
4025 int next_static_word_offset = next_static_double_offset +
4026 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
4027 int next_static_short_offset = next_static_word_offset +
4028 ((fac->count[STATIC_WORD]) * BytesPerInt);
4029 int next_static_byte_offset = next_static_short_offset +
4030 ((fac->count[STATIC_SHORT]) * BytesPerShort);
4031
4032 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
4033 nonstatic_field_size * heapOopSize;
4034
4035 // First field of value types is aligned on a long boundary in order to ease
4036 // in-lining of value types (with header removal) in packed arrays and
4037 // flatten value types
4038 int initial_value_type_padding = 0;
4039 if (is_value_type()) {
4040 int old = nonstatic_fields_start;
4041 nonstatic_fields_start = align_up(nonstatic_fields_start, BytesPerLong);
4042 initial_value_type_padding = nonstatic_fields_start - old;
4043 }
4044
4045 int next_nonstatic_field_offset = nonstatic_fields_start;
4046
4047 const bool is_contended_class = parsed_annotations->is_contended();
4048
4049 // Class is contended, pad before all the fields
4050 if (is_contended_class) {
4051 next_nonstatic_field_offset += ContendedPaddingWidth;
4052 }
4053
4054 // Temporary value types restrictions
4055 if (is_value_type()) {
4056 if (is_contended_class) {
4057 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support @Contended annotation yet");
4058 return;
4059 }
4060 }
4061
4062 // Compute the non-contended fields count.
4063 // The packing code below relies on these counts to determine if some field
4064 // can be squeezed into the alignment gap. Contended fields are obviously
4065 // exempt from that.
4066 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
4067 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
4068 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
4069 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
4070 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
4071
4072 int static_value_type_count = 0;
4073 int nonstatic_value_type_count = 0;
4074 int* nonstatic_value_type_indexes = NULL;
4075 Klass** nonstatic_value_type_klasses = NULL;
4076 unsigned int value_type_oop_map_count = 0;
4077 int not_flattened_value_types = 0;
4078
4079 int max_nonstatic_value_type = fac->count[NONSTATIC_FLATTENABLE] + 1;
4080
4081 nonstatic_value_type_indexes = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, int,
4082 max_nonstatic_value_type);
4083 for (int i = 0; i < max_nonstatic_value_type; i++) {
4084 nonstatic_value_type_indexes[i] = -1;
4085 }
4086 nonstatic_value_type_klasses = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, Klass*,
4087 max_nonstatic_value_type);
4088
4089 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
4090 if (fs.allocation_type() == STATIC_FLATTENABLE) {
4091 // Pre-resolve the flattenable field and check for value type circularity
4092 // issues. Note that super-class circularity checks are not needed here
4093 // because flattenable fields can only be in value types and value types
4094 // only have java.lang.Object as their super class.
4095 // Also, note that super-interface circularity checks are not needed
4096 // because interfaces cannot be value types.
4097 ResourceMark rm;
4098 Symbol* sig = fs.signature();
4099 Symbol* name = SymbolTable::lookup(sig->as_C_string() + 1,
4100 sig->utf8_length() - 2, CHECK);
4101 if (!InstanceKlass::is_declared_value_type(_cp, _value_types, name)) {
4102 name->decrement_refcount();
4103 THROW(vmSymbols::java_lang_ClassFormatError());
4104 }
4105 name->decrement_refcount();
4106 Klass* klass =
4107 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4108 Handle(THREAD, _loader_data->class_loader()),
4109 _protection_domain, true, CHECK);
4110 assert(klass != NULL, "Sanity check");
4111 if (!klass->access_flags().is_value_type()) {
4112 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4113 }
4114 static_value_type_count++;
4115 } else if (fs.allocation_type() == NONSTATIC_FLATTENABLE) {
4116 // Pre-resolve the flattenable field and check for value type circularity issues.
4117 ResourceMark rm;
4118 Symbol* sig = fs.signature();
4119 Symbol* name = SymbolTable::lookup(sig->as_C_string() + 1,
4120 sig->utf8_length() - 2, CHECK);
4121 if (!InstanceKlass::is_declared_value_type(_cp, _value_types, name)) {
4122 name->decrement_refcount();
4123 THROW(vmSymbols::java_lang_ClassFormatError());
4124 }
4125 name->decrement_refcount();
4126 Klass* klass =
4127 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4128 Handle(THREAD, _loader_data->class_loader()),
4129 _protection_domain, true, CHECK);
4130 assert(klass != NULL, "Sanity check");
4131 if (!klass->access_flags().is_value_type()) {
4132 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4133 }
4134 ValueKlass* vk = ValueKlass::cast(klass);
4135 // Conditions to apply flattening or not should be defined in a single place
4136 if ((ValueFieldMaxFlatSize < 0) || (vk->size_helper() * HeapWordSize) <= ValueFieldMaxFlatSize) {
4137 nonstatic_value_type_indexes[nonstatic_value_type_count] = fs.index();
4138 nonstatic_value_type_klasses[nonstatic_value_type_count] = klass;
4139 nonstatic_value_type_count++;
4140
4141 ValueKlass* vklass = ValueKlass::cast(klass);
4142 if (vklass->contains_oops()) {
4143 value_type_oop_map_count += vklass->nonstatic_oop_map_count();
4144 }
4145 fs.set_flattened(true);
4146 } else {
4147 not_flattened_value_types++;
4148 fs.set_flattened(false);
4149 }
4150 }
4151 }
4152
4153 // Adjusting non_static_oop_count to take into account not flattened value types;
4154 nonstatic_oop_count += not_flattened_value_types;
4155
4156 // Total non-static fields count, including every contended field
4157 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
4158 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
4159 fac->count[NONSTATIC_OOP] + fac->count[NONSTATIC_FLATTENABLE];
4160
4161 const bool super_has_nonstatic_fields =
4162 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
4163 const bool has_nonstatic_fields =
4164 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
4165 const bool has_nonstatic_value_fields = nonstatic_value_type_count > 0;
4166
4167 if (is_value_type() && (!has_nonstatic_fields)) {
4168 // There are a number of fixes required throughout the type system and JIT
4169 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support zero instance size yet");
4170 return;
4171 }
4172
4173 // Prepare list of oops for oop map generation.
4174 //
4175 // "offset" and "count" lists are describing the set of contiguous oop
4176 // regions. offset[i] is the start of the i-th region, which then has
4177 // count[i] oops following. Before we know how many regions are required,
4178 // we pessimistically allocate the maps to fit all the oops into the
4179 // distinct regions.
4180 //
4181 int super_oop_map_count = (_super_klass == NULL) ? 0 :_super_klass->nonstatic_oop_map_count();
4182 int max_oop_map_count =
4183 super_oop_map_count +
4184 fac->count[NONSTATIC_OOP] +
4185 value_type_oop_map_count +
4186 not_flattened_value_types;
4187
4188 OopMapBlocksBuilder* nonstatic_oop_maps = new OopMapBlocksBuilder(max_oop_map_count, THREAD);
4189 if (super_oop_map_count > 0) {
4190 nonstatic_oop_maps->initialize_inherited_blocks(_super_klass->start_of_nonstatic_oop_maps(),
4191 _super_klass->nonstatic_oop_map_count());
4192 }
4193
4194 int first_nonstatic_oop_offset = 0; // will be set for first oop field
4195
4196 bool compact_fields = CompactFields;
4197 int allocation_style = FieldsAllocationStyle;
4198 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
4199 assert(false, "0 <= FieldsAllocationStyle <= 2");
4200 allocation_style = 1; // Optimistic
4201 }
4202
4203 // The next classes have predefined hard-coded fields offsets
4204 // (see in JavaClasses::compute_hard_coded_offsets()).
4205 // Use default fields allocation order for them.
4206 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
4207 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
4208 _class_name == vmSymbols::java_lang_Class() ||
4209 _class_name == vmSymbols::java_lang_ClassLoader() ||
4210 _class_name == vmSymbols::java_lang_ref_Reference() ||
4211 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
4212 _class_name == vmSymbols::java_lang_StackTraceElement() ||
4213 _class_name == vmSymbols::java_lang_String() ||
4214 _class_name == vmSymbols::java_lang_Throwable() ||
4215 _class_name == vmSymbols::java_lang_Boolean() ||
4216 _class_name == vmSymbols::java_lang_Character() ||
4217 _class_name == vmSymbols::java_lang_Float() ||
4218 _class_name == vmSymbols::java_lang_Double() ||
4219 _class_name == vmSymbols::java_lang_Byte() ||
4220 _class_name == vmSymbols::java_lang_Short() ||
4221 _class_name == vmSymbols::java_lang_Integer() ||
4222 _class_name == vmSymbols::java_lang_Long())) {
4223 allocation_style = 0; // Allocate oops first
4224 compact_fields = false; // Don't compact fields
4225 }
4226
4227 int next_nonstatic_oop_offset = 0;
4228 int next_nonstatic_double_offset = 0;
4229
4230 // Rearrange fields for a given allocation style
4231 if( allocation_style == 0 ) {
4232 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
4233 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4234 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4235 (nonstatic_oop_count * heapOopSize);
4236 } else if( allocation_style == 1 ) {
4237 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
4238 next_nonstatic_double_offset = next_nonstatic_field_offset;
4239 } else if( allocation_style == 2 ) {
4240 // Fields allocation: oops fields in super and sub classes are together.
4241 if( nonstatic_field_size > 0 && super_oop_map_count > 0 ) {
4242 if (next_nonstatic_field_offset == nonstatic_oop_maps->last_oop_map()->end_offset()) {
4243 allocation_style = 0; // allocate oops first
4244 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4245 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4246 (nonstatic_oop_count * heapOopSize);
4247 }
4248 }
4249 if( allocation_style == 2 ) {
4250 allocation_style = 1; // allocate oops last
4251 next_nonstatic_double_offset = next_nonstatic_field_offset;
4252 }
4253 } else {
4254 ShouldNotReachHere();
4255 }
4256
4257 int nonstatic_oop_space_count = 0;
4258 int nonstatic_word_space_count = 0;
4259 int nonstatic_short_space_count = 0;
4260 int nonstatic_byte_space_count = 0;
4261 int nonstatic_oop_space_offset = 0;
4262 int nonstatic_word_space_offset = 0;
4263 int nonstatic_short_space_offset = 0;
4264 int nonstatic_byte_space_offset = 0;
4265
4266 // Try to squeeze some of the fields into the gaps due to
4267 // long/double alignment.
4268 if (nonstatic_double_count > 0) {
4269 int offset = next_nonstatic_double_offset;
4270 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
4271 if (compact_fields && offset != next_nonstatic_double_offset) {
4272 // Allocate available fields into the gap before double field.
4273 int length = next_nonstatic_double_offset - offset;
4274 assert(length == BytesPerInt, "");
4275 nonstatic_word_space_offset = offset;
4276 if (nonstatic_word_count > 0) {
4277 nonstatic_word_count -= 1;
4278 nonstatic_word_space_count = 1; // Only one will fit
4279 length -= BytesPerInt;
4280 offset += BytesPerInt;
4281 }
4282 nonstatic_short_space_offset = offset;
4283 while (length >= BytesPerShort && nonstatic_short_count > 0) {
4284 nonstatic_short_count -= 1;
4285 nonstatic_short_space_count += 1;
4286 length -= BytesPerShort;
4287 offset += BytesPerShort;
4288 }
4289 nonstatic_byte_space_offset = offset;
4290 while (length > 0 && nonstatic_byte_count > 0) {
4291 nonstatic_byte_count -= 1;
4292 nonstatic_byte_space_count += 1;
4293 length -= 1;
4294 }
4295 // Allocate oop field in the gap if there are no other fields for that.
4296 nonstatic_oop_space_offset = offset;
4297 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
4298 allocation_style != 0) { // when oop fields not first
4299 nonstatic_oop_count -= 1;
4300 nonstatic_oop_space_count = 1; // Only one will fit
4301 length -= heapOopSize;
4302 offset += heapOopSize;
4303 }
4304 }
4305 }
4306
4307 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4308 (nonstatic_double_count * BytesPerLong);
4309 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4310 (nonstatic_word_count * BytesPerInt);
4311 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4312 (nonstatic_short_count * BytesPerShort);
4313 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4314 nonstatic_byte_count;
4315
4316 // let oops jump before padding with this allocation style
4317 if( allocation_style == 1 ) {
4318 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4319 if( nonstatic_oop_count > 0 ) {
4320 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4321 }
4322 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4323 }
4324
4325 // Aligning embedded value types
4326 // bug below, the current algorithm to layout embedded value types always put them at the
4327 // end of the layout, which doesn't match the different allocation policies the VM is
4328 // supposed to provide => FixMe
4329 // Note also that the current alignment policy is to make each value type starting on a
4330 // 64 bits boundary. This could be optimized later. For instance, it could be nice to
4331 // align value types according to their most constrained internal type.
4332 next_nonstatic_valuetype_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4333 int next_value_type_index = 0;
4334
4335 // Iterate over fields again and compute correct offsets.
4336 // The field allocation type was temporarily stored in the offset slot.
4337 // oop fields are located before non-oop fields (static and non-static).
4338 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4339
4340 // skip already laid out fields
4341 if (fs.is_offset_set()) continue;
4342
4343 // contended instance fields are handled below
4344 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4345
4346 int real_offset = 0;
4347 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4348
4349 // pack the rest of the fields
4350 switch (atype) {
4351 // Value types in static fields are handled with oops
4352 case STATIC_FLATTENABLE: // Fallthrough
4353 case STATIC_OOP:
4354 real_offset = next_static_oop_offset;
4355 next_static_oop_offset += heapOopSize;
4356 break;
4357 case STATIC_BYTE:
4358 real_offset = next_static_byte_offset;
4359 next_static_byte_offset += 1;
4360 break;
4361 case STATIC_SHORT:
4362 real_offset = next_static_short_offset;
4363 next_static_short_offset += BytesPerShort;
4364 break;
4365 case STATIC_WORD:
4366 real_offset = next_static_word_offset;
4367 next_static_word_offset += BytesPerInt;
4368 break;
4369 case STATIC_DOUBLE:
4370 real_offset = next_static_double_offset;
4371 next_static_double_offset += BytesPerLong;
4372 break;
4373 case NONSTATIC_FLATTENABLE:
4374 if (fs.is_flattened()) {
4375 Klass* klass = nonstatic_value_type_klasses[next_value_type_index];
4376 assert(klass != NULL, "Klass should have been loaded and resolved earlier");
4377 assert(klass->access_flags().is_value_type(),"Must be a value type");
4378 ValueKlass* vklass = ValueKlass::cast(klass);
4379 real_offset = next_nonstatic_valuetype_offset;
4380 next_nonstatic_valuetype_offset += (vklass->size_helper()) * wordSize - vklass->first_field_offset();
4381 // aligning next value type on a 64 bits boundary
4382 next_nonstatic_valuetype_offset = align_up(next_nonstatic_valuetype_offset, BytesPerLong);
4383 next_value_type_index += 1;
4384
4385 if (vklass->contains_oops()) { // add flatten oop maps
4386 int diff = real_offset - vklass->first_field_offset();
4387 const OopMapBlock* map = vklass->start_of_nonstatic_oop_maps();
4388 const OopMapBlock* const last_map = map + vklass->nonstatic_oop_map_count();
4389 while (map < last_map) {
4390 nonstatic_oop_maps->add(map->offset() + diff, map->count());
4391 map++;
4392 }
4393 }
4394 break;
4395 } else {
4396 // Fall through
4397 }
4398 case NONSTATIC_OOP:
4399 if( nonstatic_oop_space_count > 0 ) {
4400 real_offset = nonstatic_oop_space_offset;
4401 nonstatic_oop_space_offset += heapOopSize;
4402 nonstatic_oop_space_count -= 1;
4403 } else {
4404 real_offset = next_nonstatic_oop_offset;
4405 next_nonstatic_oop_offset += heapOopSize;
4406 }
4407 nonstatic_oop_maps->add(real_offset, 1);
4408 break;
4409 case NONSTATIC_BYTE:
4410 if( nonstatic_byte_space_count > 0 ) {
4411 real_offset = nonstatic_byte_space_offset;
4412 nonstatic_byte_space_offset += 1;
4413 nonstatic_byte_space_count -= 1;
4414 } else {
4415 real_offset = next_nonstatic_byte_offset;
4416 next_nonstatic_byte_offset += 1;
4417 }
4418 break;
4419 case NONSTATIC_SHORT:
4420 if( nonstatic_short_space_count > 0 ) {
4421 real_offset = nonstatic_short_space_offset;
4422 nonstatic_short_space_offset += BytesPerShort;
4423 nonstatic_short_space_count -= 1;
4424 } else {
4425 real_offset = next_nonstatic_short_offset;
4426 next_nonstatic_short_offset += BytesPerShort;
4427 }
4428 break;
4429 case NONSTATIC_WORD:
4430 if( nonstatic_word_space_count > 0 ) {
4431 real_offset = nonstatic_word_space_offset;
4432 nonstatic_word_space_offset += BytesPerInt;
4433 nonstatic_word_space_count -= 1;
4434 } else {
4435 real_offset = next_nonstatic_word_offset;
4436 next_nonstatic_word_offset += BytesPerInt;
4437 }
4438 break;
4439 case NONSTATIC_DOUBLE:
4440 real_offset = next_nonstatic_double_offset;
4441 next_nonstatic_double_offset += BytesPerLong;
4442 break;
4443 default:
4444 ShouldNotReachHere();
4445 }
4446 fs.set_offset(real_offset);
4447 }
4448
4449
4450 // Handle the contended cases.
4451 //
4452 // Each contended field should not intersect the cache line with another contended field.
4453 // In the absence of alignment information, we end up with pessimistically separating
4454 // the fields with full-width padding.
4455 //
4456 // Additionally, this should not break alignment for the fields, so we round the alignment up
4457 // for each field.
4458 if (nonstatic_contended_count > 0) {
4459
4460 // if there is at least one contended field, we need to have pre-padding for them
4461 next_nonstatic_padded_offset += ContendedPaddingWidth;
4462
4463 // collect all contended groups
4464 ResourceBitMap bm(cp->size());
4465 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4466 // skip already laid out fields
4467 if (fs.is_offset_set()) continue;
4468
4469 if (fs.is_contended()) {
4470 bm.set_bit(fs.contended_group());
4471 }
4472 }
4473
4474 int current_group = -1;
4475 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4476
4477 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4478
4479 // skip already laid out fields
4480 if (fs.is_offset_set()) continue;
4481
4482 // skip non-contended fields and fields from different group
4483 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4484
4485 // handle statics below
4486 if (fs.access_flags().is_static()) continue;
4487
4488 int real_offset = 0;
4489 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4490
4491 switch (atype) {
4492 case NONSTATIC_BYTE:
4493 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4494 real_offset = next_nonstatic_padded_offset;
4495 next_nonstatic_padded_offset += 1;
4496 break;
4497
4498 case NONSTATIC_SHORT:
4499 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4500 real_offset = next_nonstatic_padded_offset;
4501 next_nonstatic_padded_offset += BytesPerShort;
4502 break;
4503
4504 case NONSTATIC_WORD:
4505 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4506 real_offset = next_nonstatic_padded_offset;
4507 next_nonstatic_padded_offset += BytesPerInt;
4508 break;
4509
4510 case NONSTATIC_DOUBLE:
4511 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4512 real_offset = next_nonstatic_padded_offset;
4513 next_nonstatic_padded_offset += BytesPerLong;
4514 break;
4515
4516 // Value types in static fields are handled with oops
4517 case NONSTATIC_FLATTENABLE:
4518 throwValueTypeLimitation(THREAD_AND_LOCATION,
4519 "@Contended annotation not supported for value types yet", fs.name(), fs.signature());
4520 return;
4521
4522 case NONSTATIC_OOP:
4523 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4524 real_offset = next_nonstatic_padded_offset;
4525 next_nonstatic_padded_offset += heapOopSize;
4526 nonstatic_oop_maps->add(real_offset, 1);
4527 break;
4528
4529 default:
4530 ShouldNotReachHere();
4531 }
4532
4533 if (fs.contended_group() == 0) {
4534 // Contended group defines the equivalence class over the fields:
4535 // the fields within the same contended group are not inter-padded.
4536 // The only exception is default group, which does not incur the
4537 // equivalence, and so requires intra-padding.
4538 next_nonstatic_padded_offset += ContendedPaddingWidth;
4539 }
4540
4541 fs.set_offset(real_offset);
4542 } // for
4543
4544 // Start laying out the next group.
4545 // Note that this will effectively pad the last group in the back;
4546 // this is expected to alleviate memory contention effects for
4547 // subclass fields and/or adjacent object.
4548 // If this was the default group, the padding is already in place.
4549 if (current_group != 0) {
4550 next_nonstatic_padded_offset += ContendedPaddingWidth;
4551 }
4552 }
4553
4554 // handle static fields
4555 }
4556
4557 // Entire class is contended, pad in the back.
4558 // This helps to alleviate memory contention effects for subclass fields
4559 // and/or adjacent object.
4560 if (is_contended_class) {
4561 assert(!is_value_type(), "@Contended not supported for value types yet");
4562 next_nonstatic_padded_offset += ContendedPaddingWidth;
4563 }
4564
4565 int notaligned_nonstatic_fields_end;
4566 if (nonstatic_value_type_count != 0) {
4567 notaligned_nonstatic_fields_end = next_nonstatic_valuetype_offset;
4568 } else {
4569 notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4570 }
4571
4572 int nonstatic_field_sz_align = heapOopSize;
4573 if (is_value_type()) {
4574 if ((notaligned_nonstatic_fields_end - nonstatic_fields_start) > heapOopSize) {
4575 nonstatic_field_sz_align = BytesPerLong; // value copy of fields only uses jlong copy
4576 }
4577 }
4578 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, nonstatic_field_sz_align);
4579 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4580 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4581
4582 int static_field_size = (static_fields_end -
4583 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4584 nonstatic_field_size = nonstatic_field_size +
4585 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4586
4587 int instance_size = align_object_size(instance_end / wordSize);
4588
4589 assert(instance_size == align_object_size(align_up(
4590 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize)
4591 + initial_value_type_padding, wordSize) / wordSize), "consistent layout helper value");
4592
4593
4594 // Invariant: nonstatic_field end/start should only change if there are
4595 // nonstatic fields in the class, or if the class is contended. We compare
4596 // against the non-aligned value, so that end alignment will not fail the
4597 // assert without actually having the fields.
4598 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4599 is_contended_class ||
4600 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4601
4602 // Number of non-static oop map blocks allocated at end of klass.
4603 nonstatic_oop_maps->compact(THREAD);
4604
4605 #ifndef PRODUCT
4606 if ((PrintFieldLayout && !is_value_type()) ||
4607 (PrintValueLayout && (is_value_type() || has_nonstatic_value_fields))) {
4608 print_field_layout(_class_name,
4609 _fields,
4610 cp,
4611 instance_size,
4612 nonstatic_fields_start,
4613 nonstatic_fields_end,
4614 static_fields_end);
4615 nonstatic_oop_maps->print_on(tty);
4616 tty->print("\n");
4617 }
4618
4619 #endif
4620 // Pass back information needed for InstanceKlass creation
4621 info->oop_map_blocks = nonstatic_oop_maps;
4622 info->instance_size = instance_size;
4623 info->static_field_size = static_field_size;
4624 info->nonstatic_field_size = nonstatic_field_size;
4625 info->has_nonstatic_fields = has_nonstatic_fields;
4626 }
4627
4628 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik, TRAPS) {
4629 assert(ik != NULL, "invariant");
4630
4631 const Klass* const super = ik->super();
4632
4633 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4634 // in which case we don't have to register objects as finalizable
4635 if (!_has_empty_finalizer) {
4636 if (_has_finalizer ||
4637 (super != NULL && super->has_finalizer())) {
4638 ik->set_has_finalizer();
4639 }
4640 }
4641
4642 #ifdef ASSERT
4643 bool f = false;
4644 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4645 vmSymbols::void_method_signature());
4646 if (m != NULL && !m->is_empty_method()) {
4647 f = true;
4648 }
4649
4650 // Spec doesn't prevent agent from redefinition of empty finalizer.
4651 // Despite the fact that it's generally bad idea and redefined finalizer
4652 // will not work as expected we shouldn't abort vm in this case
4653 if (!ik->has_redefined_this_or_super()) {
4654 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4655 }
4656 #endif
4657
4658 // Check if this klass supports the java.lang.Cloneable interface
4659 if (SystemDictionary::Cloneable_klass_loaded()) {
4660 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4661 if (ik->is_value()) {
4662 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support Cloneable");
4663 return;
4664 }
4665 ik->set_is_cloneable();
4666 }
4667 }
4668
4669 // Check if this klass has a vanilla default constructor
4670 if (super == NULL) {
4671 // java.lang.Object has empty default constructor
4672 ik->set_has_vanilla_constructor();
4673 } else {
4674 if (super->has_vanilla_constructor() &&
4675 _has_vanilla_constructor) {
4676 ik->set_has_vanilla_constructor();
4677 }
4678 #ifdef ASSERT
4679 bool v = false;
4680 if (super->has_vanilla_constructor()) {
4681 const Method* const constructor =
4682 ik->find_method(vmSymbols::object_initializer_name(),
4683 vmSymbols::void_method_signature());
4684 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4685 v = true;
4686 }
4687 }
4688 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4689 #endif
4690 }
4691
4692 // If it cannot be fast-path allocated, set a bit in the layout helper.
4693 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4694 assert(ik->size_helper() > 0, "layout_helper is initialized");
4695 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4696 || ik->is_abstract() || ik->is_interface()
4697 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4698 || ik->size_helper() >= FastAllocateSizeLimit) {
4699 // Forbid fast-path allocation.
4700 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4701 ik->set_layout_helper(lh);
4702 }
4703 }
4704
4705 bool ClassFileParser::supports_value_types() const {
4706 // Value types are only supported by class file version 55 and later
4707 return EnableValhalla && _major_version >= JAVA_11_VERSION;
4708 }
4709
4710 // Attach super classes and interface classes to class loader data
4711 static void record_defined_class_dependencies(const InstanceKlass* defined_klass,
4712 TRAPS) {
4713 assert(defined_klass != NULL, "invariant");
4714
4715 ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data();
4716 if (defining_loader_data->is_the_null_class_loader_data()) {
4717 // Dependencies to null class loader data are implicit.
4718 return;
4719 } else {
4720 // add super class dependency
4721 Klass* const super = defined_klass->super();
4722 if (super != NULL) {
4723 defining_loader_data->record_dependency(super);
4724 }
4725
4726 // add super interface dependencies
4727 const Array<Klass*>* const local_interfaces = defined_klass->local_interfaces();
4728 if (local_interfaces != NULL) {
4729 const int length = local_interfaces->length();
4730 for (int i = 0; i < length; i++) {
4731 defining_loader_data->record_dependency(local_interfaces->at(i));
4732 }
4733 }
4734
4735 for(int i = 0; i < defined_klass->java_fields_count(); i++) {
4736 if ((defined_klass->field_access_flags(i) & JVM_ACC_FLATTENABLE) != 0) {
4737 const Klass* klass = defined_klass->get_value_field_klass(i);
4738 defining_loader_data->record_dependency(klass);
4739 }
4740 }
4741 }
4742 }
4743
4744 // utility methods for appending an array with check for duplicates
4745
4746 static void append_interfaces(GrowableArray<Klass*>* result,
4747 const Array<Klass*>* const ifs) {
4748 // iterate over new interfaces
4749 for (int i = 0; i < ifs->length(); i++) {
4750 Klass* const e = ifs->at(i);
4751 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4752 // add new interface
4753 result->append_if_missing(e);
4754 }
4755 }
4756
4757 static Array<Klass*>* compute_transitive_interfaces(const InstanceKlass* super,
4758 Array<Klass*>* local_ifs,
4759 ClassLoaderData* loader_data,
4760 TRAPS) {
4761 assert(local_ifs != NULL, "invariant");
4762 assert(loader_data != NULL, "invariant");
4763
4764 // Compute maximum size for transitive interfaces
4765 int max_transitive_size = 0;
4766 int super_size = 0;
4767 // Add superclass transitive interfaces size
4768 if (super != NULL) {
4769 super_size = super->transitive_interfaces()->length();
4770 max_transitive_size += super_size;
4771 }
4772 // Add local interfaces' super interfaces
4773 const int local_size = local_ifs->length();
4774 for (int i = 0; i < local_size; i++) {
4775 Klass* const l = local_ifs->at(i);
4776 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4777 }
4778 // Finally add local interfaces
4779 max_transitive_size += local_size;
4780 // Construct array
4781 if (max_transitive_size == 0) {
4782 // no interfaces, use canonicalized array
4783 return Universe::the_empty_klass_array();
4784 } else if (max_transitive_size == super_size) {
4785 // no new local interfaces added, share superklass' transitive interface array
4786 return super->transitive_interfaces();
4787 } else if (max_transitive_size == local_size) {
4788 // only local interfaces added, share local interface array
4789 return local_ifs;
4790 } else {
4791 ResourceMark rm;
4792 GrowableArray<Klass*>* const result = new GrowableArray<Klass*>(max_transitive_size);
4793
4794 // Copy down from superclass
4795 if (super != NULL) {
4796 append_interfaces(result, super->transitive_interfaces());
4797 }
4798
4799 // Copy down from local interfaces' superinterfaces
4800 for (int i = 0; i < local_size; i++) {
4801 Klass* const l = local_ifs->at(i);
4802 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4803 }
4804 // Finally add local interfaces
4805 append_interfaces(result, local_ifs);
4806
4807 // length will be less than the max_transitive_size if duplicates were removed
4808 const int length = result->length();
4809 assert(length <= max_transitive_size, "just checking");
4810 Array<Klass*>* const new_result =
4811 MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL);
4812 for (int i = 0; i < length; i++) {
4813 Klass* const e = result->at(i);
4814 assert(e != NULL, "just checking");
4815 new_result->at_put(i, e);
4816 }
4817 return new_result;
4818 }
4819 }
4820
4821 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4822 assert(this_klass != NULL, "invariant");
4823 const Klass* const super = this_klass->super();
4824 if (super != NULL) {
4825
4826 // If the loader is not the boot loader then throw an exception if its
4827 // superclass is in package jdk.internal.reflect and its loader is not a
4828 // special reflection class loader
4829 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4830 assert(super->is_instance_klass(), "super is not instance klass");
4831 PackageEntry* super_package = super->package();
4832 if (super_package != NULL &&
4833 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4834 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4835 ResourceMark rm(THREAD);
4836 Exceptions::fthrow(
4837 THREAD_AND_LOCATION,
4838 vmSymbols::java_lang_IllegalAccessError(),
4839 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4840 this_klass->external_name(),
4841 this_klass->class_loader_data()->loader_name(),
4842 super->external_name());
4843 return;
4844 }
4845 }
4846
4847 Reflection::VerifyClassAccessResults vca_result =
4848 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4849 if (vca_result != Reflection::ACCESS_OK) {
4850 ResourceMark rm(THREAD);
4851 char* msg = Reflection::verify_class_access_msg(this_klass,
4852 InstanceKlass::cast(super),
4853 vca_result);
4854 if (msg == NULL) {
4855 Exceptions::fthrow(
4856 THREAD_AND_LOCATION,
4857 vmSymbols::java_lang_IllegalAccessError(),
4858 "class %s cannot access its superclass %s",
4859 this_klass->external_name(),
4860 super->external_name());
4861 } else {
4862 // Add additional message content.
4863 Exceptions::fthrow(
4864 THREAD_AND_LOCATION,
4865 vmSymbols::java_lang_IllegalAccessError(),
4866 "superclass access check failed: %s",
4867 msg);
4868 }
4869 }
4870 }
4871 }
4872
4873
4874 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4875 assert(this_klass != NULL, "invariant");
4876 const Array<Klass*>* const local_interfaces = this_klass->local_interfaces();
4877 const int lng = local_interfaces->length();
4878 for (int i = lng - 1; i >= 0; i--) {
4879 Klass* const k = local_interfaces->at(i);
4880 assert (k != NULL && k->is_interface(), "invalid interface");
4881 Reflection::VerifyClassAccessResults vca_result =
4882 Reflection::verify_class_access(this_klass, InstanceKlass::cast(k), false);
4883 if (vca_result != Reflection::ACCESS_OK) {
4884 ResourceMark rm(THREAD);
4885 char* msg = Reflection::verify_class_access_msg(this_klass,
4886 InstanceKlass::cast(k),
4887 vca_result);
4888 if (msg == NULL) {
4889 Exceptions::fthrow(
4890 THREAD_AND_LOCATION,
4891 vmSymbols::java_lang_IllegalAccessError(),
4892 "class %s cannot access its superinterface %s",
4893 this_klass->external_name(),
4894 k->external_name());
4895 } else {
4896 // Add additional message content.
4897 Exceptions::fthrow(
4898 THREAD_AND_LOCATION,
4899 vmSymbols::java_lang_IllegalAccessError(),
4900 "superinterface check failed: %s",
4901 msg);
4902 }
4903 }
4904 }
4905 }
4906
4907
4908 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4909 assert(this_klass != NULL, "invariant");
4910 const Array<Method*>* const methods = this_klass->methods();
4911 const int num_methods = methods->length();
4912
4913 // go thru each method and check if it overrides a final method
4914 for (int index = 0; index < num_methods; index++) {
4915 const Method* const m = methods->at(index);
4916
4917 // skip private, static, and <init> methods
4918 if ((!m->is_private() && !m->is_static()) &&
4919 (m->name() != vmSymbols::object_initializer_name())) {
4920
4921 const Symbol* const name = m->name();
4922 const Symbol* const signature = m->signature();
4923 const Klass* k = this_klass->super();
4924 const Method* super_m = NULL;
4925 while (k != NULL) {
4926 // skip supers that don't have final methods.
4927 if (k->has_final_method()) {
4928 // lookup a matching method in the super class hierarchy
4929 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4930 if (super_m == NULL) {
4931 break; // didn't find any match; get out
4932 }
4933
4934 if (super_m->is_final() && !super_m->is_static() &&
4935 // matching method in super is final, and not static
4936 (Reflection::verify_field_access(this_klass,
4937 super_m->method_holder(),
4938 super_m->method_holder(),
4939 super_m->access_flags(), false))
4940 // this class can access super final method and therefore override
4941 ) {
4942 ResourceMark rm(THREAD);
4943 Exceptions::fthrow(
4944 THREAD_AND_LOCATION,
4945 vmSymbols::java_lang_VerifyError(),
4946 "class %s overrides final method %s.%s%s",
4947 this_klass->external_name(),
4948 super_m->method_holder()->external_name(),
4949 name->as_C_string(),
4950 signature->as_C_string()
4951 );
4952 return;
4953 }
4954
4955 // continue to look from super_m's holder's super.
4956 k = super_m->method_holder()->super();
4957 continue;
4958 }
4959
4960 k = k->super();
4961 }
4962 }
4963 }
4964 }
4965
4966
4967 // assumes that this_klass is an interface
4968 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4969 assert(this_klass != NULL, "invariant");
4970 assert(this_klass->is_interface(), "not an interface");
4971 const Array<Method*>* methods = this_klass->methods();
4972 const int num_methods = methods->length();
4973
4974 for (int index = 0; index < num_methods; index++) {
4975 const Method* const m = methods->at(index);
4976 // if m is static and not the init method, throw a verify error
4977 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4978 ResourceMark rm(THREAD);
4979 Exceptions::fthrow(
4980 THREAD_AND_LOCATION,
4981 vmSymbols::java_lang_VerifyError(),
4982 "Illegal static method %s in interface %s",
4983 m->name()->as_C_string(),
4984 this_klass->external_name()
4985 );
4986 return;
4987 }
4988 }
4989 }
4990
4991 // utility methods for format checking
4992
4993 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4994 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4995 const bool is_value_type = (flags & JVM_ACC_VALUE) != 0;
4996 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4997 assert(supports_value_types() || !is_value_type, "JVM_ACC_VALUE should not be set");
4998 if (is_module) {
4999 ResourceMark rm(THREAD);
5000 Exceptions::fthrow(
5001 THREAD_AND_LOCATION,
5002 vmSymbols::java_lang_NoClassDefFoundError(),
5003 "%s is not a class because access_flag ACC_MODULE is set",
5004 _class_name->as_C_string());
5005 return;
5006 }
5007
5008 if (is_value_type && !EnableValhalla) {
5009 ResourceMark rm(THREAD);
5010 Exceptions::fthrow(
5011 THREAD_AND_LOCATION,
5012 vmSymbols::java_lang_ClassFormatError(),
5013 "Class modifier ACC_VALUE in class %s requires option -XX:+EnableValhalla",
5014 _class_name->as_C_string()
5015 );
5016 }
5017
5018 if (!_need_verify) { return; }
5019
5020 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5021 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5022 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5023 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
5024 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5025 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
5026 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5027
5028 if ((is_abstract && is_final) ||
5029 (is_interface && !is_abstract) ||
5030 (is_interface && major_gte_15 && (is_super || is_enum)) ||
5031 (!is_interface && major_gte_15 && is_annotation) ||
5032 (is_value_type && (is_interface || is_abstract || is_enum || !is_final))) {
5033 ResourceMark rm(THREAD);
5034 Exceptions::fthrow(
5035 THREAD_AND_LOCATION,
5036 vmSymbols::java_lang_ClassFormatError(),
5037 "Illegal class modifiers in class %s: 0x%X",
5038 _class_name->as_C_string(), flags
5039 );
5040 return;
5041 }
5042 }
5043
5044 static bool has_illegal_visibility(jint flags) {
5045 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5046 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5047 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5048
5049 return ((is_public && is_protected) ||
5050 (is_public && is_private) ||
5051 (is_protected && is_private));
5052 }
5053
5054 // A legal major_version.minor_version must be one of the following:
5055 //
5056 // Major_version = 45, any minor_version.
5057 // Major_version >= 46 and major_version <= current_major_version and minor_version = 0.
5058 // Major_version = current_major_version and minor_version = 65535 and --enable-preview is present.
5059 //
5060 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
5061 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
5062 if (major != JAVA_MIN_SUPPORTED_VERSION) { // All 45.* are ok including 45.65535
5063 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
5064 if (major != max_version) {
5065 ResourceMark rm(THREAD);
5066 Exceptions::fthrow(
5067 THREAD_AND_LOCATION,
5068 vmSymbols::java_lang_UnsupportedClassVersionError(),
5069 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
5070 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
5071 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
5072 return;
5073 }
5074
5075 if (!Arguments::enable_preview()) {
5076 ResourceMark rm(THREAD);
5077 Exceptions::fthrow(
5078 THREAD_AND_LOCATION,
5079 vmSymbols::java_lang_UnsupportedClassVersionError(),
5080 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
5081 class_name->as_C_string(), major, minor);
5082 return;
5083 }
5084
5085 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
5086 if (major > max_version) {
5087 ResourceMark rm(THREAD);
5088 Exceptions::fthrow(
5089 THREAD_AND_LOCATION,
5090 vmSymbols::java_lang_UnsupportedClassVersionError(),
5091 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5092 "this version of the Java Runtime only recognizes class file versions up to %u.0",
5093 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
5094 } else if (major < JAVA_MIN_SUPPORTED_VERSION) {
5095 ResourceMark rm(THREAD);
5096 Exceptions::fthrow(
5097 THREAD_AND_LOCATION,
5098 vmSymbols::java_lang_UnsupportedClassVersionError(),
5099 "%s (class file version %u.%u) was compiled with an invalid major version",
5100 class_name->as_C_string(), major, minor);
5101 } else if (minor != 0) {
5102 ResourceMark rm(THREAD);
5103 Exceptions::fthrow(
5104 THREAD_AND_LOCATION,
5105 vmSymbols::java_lang_UnsupportedClassVersionError(),
5106 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
5107 class_name->as_C_string(), major, minor);
5108 }
5109 }
5110 }
5111 }
5112
5113 void ClassFileParser::verify_legal_field_modifiers(jint flags,
5114 bool is_interface,
5115 bool is_value_type,
5116 TRAPS) const {
5117 if (!_need_verify) { return; }
5118
5119 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5120 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5121 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5122 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5123 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5124 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
5125 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
5126 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5127 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5128
5129 bool is_illegal = false;
5130
5131 if (is_interface) {
5132 if (!is_public || !is_static || !is_final || is_private ||
5133 is_protected || is_volatile || is_transient ||
5134 (major_gte_15 && is_enum)) {
5135 is_illegal = true;
5136 }
5137 } else { // not interface
5138 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
5139 is_illegal = true;
5140 } else {
5141 if (is_value_type && !is_static && !is_final) {
5142 is_illegal = true;
5143 }
5144 }
5145 }
5146
5147 if (is_illegal) {
5148 ResourceMark rm(THREAD);
5149 Exceptions::fthrow(
5150 THREAD_AND_LOCATION,
5151 vmSymbols::java_lang_ClassFormatError(),
5152 "Illegal field modifiers in class %s: 0x%X",
5153 _class_name->as_C_string(), flags);
5154 return;
5155 }
5156 }
5157
5158 void ClassFileParser::verify_legal_method_modifiers(jint flags,
5159 bool is_interface,
5160 bool is_value_type,
5161 const Symbol* name,
5162 TRAPS) const {
5163 if (!_need_verify) { return; }
5164
5165 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5166 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5167 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5168 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5169 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
5170 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5171 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
5172 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
5173 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
5174 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5175 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5176 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
5177 const bool is_initializer = (name == vmSymbols::object_initializer_name());
5178
5179 bool is_illegal = false;
5180
5181 if (is_interface) {
5182 if (major_gte_8) {
5183 // Class file version is JAVA_8_VERSION or later Methods of
5184 // interfaces may set any of the flags except ACC_PROTECTED,
5185 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5186 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5187 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5188 (is_native || is_protected || is_final || is_synchronized) ||
5189 // If a specific method of a class or interface has its
5190 // ACC_ABSTRACT flag set, it must not have any of its
5191 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5192 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
5193 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5194 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5195 (is_abstract && (is_private || is_static || is_strict))) {
5196 is_illegal = true;
5197 }
5198 } else if (major_gte_15) {
5199 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5200 if (!is_public || is_private || is_protected || is_static || is_final ||
5201 is_synchronized || is_native || !is_abstract || is_strict) {
5202 is_illegal = true;
5203 }
5204 } else {
5205 // Class file version is pre-JAVA_1_5_VERSION
5206 if (!is_public || is_static || is_final || is_native || !is_abstract) {
5207 is_illegal = true;
5208 }
5209 }
5210 } else { // not interface
5211 if (has_illegal_visibility(flags)) {
5212 is_illegal = true;
5213 } else {
5214 if (is_initializer) {
5215 if (is_static || is_final || is_synchronized || is_native ||
5216 is_abstract || (major_gte_15 && is_bridge)) {
5217 is_illegal = true;
5218 }
5219 } else { // not initializer
5220 if (is_value_type && is_synchronized && !is_static) {
5221 is_illegal = true;
5222 } else {
5223 if (is_abstract) {
5224 if ((is_final || is_native || is_private || is_static ||
5225 (major_gte_15 && (is_synchronized || is_strict)))) {
5226 is_illegal = true;
5227 }
5228 }
5229 }
5230 }
5231 }
5232 }
5233
5234 if (is_illegal) {
5235 ResourceMark rm(THREAD);
5236 Exceptions::fthrow(
5237 THREAD_AND_LOCATION,
5238 vmSymbols::java_lang_ClassFormatError(),
5239 "Method %s in class %s has illegal modifiers: 0x%X",
5240 name->as_C_string(), _class_name->as_C_string(), flags);
5241 return;
5242 }
5243 }
5244
5245 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5246 int length,
5247 TRAPS) const {
5248 assert(_need_verify, "only called when _need_verify is true");
5249 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5250 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5251 }
5252 }
5253
5254 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5255 // In class names, '/' separates unqualified names. This is verified in this function also.
5256 // Method names also may not contain the characters '<' or '>', unless <init>
5257 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5258 // method. Because these names have been checked as special cases before
5259 // calling this method in verify_legal_method_name.
5260 //
5261 // This method is also called from the modular system APIs in modules.cpp
5262 // to verify the validity of module and package names.
5263 bool ClassFileParser::verify_unqualified_name(const char* name,
5264 unsigned int length,
5265 int type) {
5266 for (const char* p = name; p != name + length;) {
5267 jchar ch = *p;
5268 if (ch < 128) {
5269 if (ch == '.' || ch == ';' || ch == '[' ) {
5270 return false; // do not permit '.', ';', or '['
5271 }
5272 if (ch == '/') {
5273 // check for '//' or leading or trailing '/' which are not legal
5274 // unqualified name must not be empty
5275 if (type == ClassFileParser::LegalClass) {
5276 if (p == name || p+1 >= name+length || *(p+1) == '/') {
5277 return false;
5278 }
5279 } else {
5280 return false; // do not permit '/' unless it's class name
5281 }
5282 }
5283 if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) {
5284 return false; // do not permit '<' or '>' in method names
5285 }
5286 p++;
5287 } else {
5288 char* tmp_p = UTF8::next(p, &ch);
5289 p = tmp_p;
5290 }
5291 }
5292 return true;
5293 }
5294
5295 // Take pointer to a string. Skip over the longest part of the string that could
5296 // be taken as a fieldname. Allow '/' if slash_ok is true.
5297 // Return a pointer to just past the fieldname.
5298 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5299 // being true, we saw consecutive slashes (meaning we were looking for a
5300 // qualified path but found something that was badly-formed).
5301 static const char* skip_over_field_name(const char* name,
5302 bool slash_ok,
5303 unsigned int length) {
5304 const char* p;
5305 jboolean last_is_slash = false;
5306 jboolean not_first_ch = false;
5307
5308 for (p = name; p != name + length; not_first_ch = true) {
5309 const char* old_p = p;
5310 jchar ch = *p;
5311 if (ch < 128) {
5312 p++;
5313 // quick check for ascii
5314 if ((ch >= 'a' && ch <= 'z') ||
5315 (ch >= 'A' && ch <= 'Z') ||
5316 (ch == '_' || ch == '$') ||
5317 (not_first_ch && ch >= '0' && ch <= '9')) {
5318 last_is_slash = false;
5319 continue;
5320 }
5321 if (slash_ok && ch == '/') {
5322 if (last_is_slash) {
5323 return NULL; // Don't permit consecutive slashes
5324 }
5325 last_is_slash = true;
5326 continue;
5327 }
5328 }
5329 else {
5330 jint unicode_ch;
5331 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5332 p = tmp_p;
5333 last_is_slash = false;
5334 // Check if ch is Java identifier start or is Java identifier part
5335 // 4672820: call java.lang.Character methods directly without generating separate tables.
5336 EXCEPTION_MARK;
5337
5338 // return value
5339 JavaValue result(T_BOOLEAN);
5340 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5341 JavaCallArguments args;
5342 args.push_int(unicode_ch);
5343
5344 // public static boolean isJavaIdentifierStart(char ch);
5345 JavaCalls::call_static(&result,
5346 SystemDictionary::Character_klass(),
5347 vmSymbols::isJavaIdentifierStart_name(),
5348 vmSymbols::int_bool_signature(),
5349 &args,
5350 THREAD);
5351
5352 if (HAS_PENDING_EXCEPTION) {
5353 CLEAR_PENDING_EXCEPTION;
5354 return 0;
5355 }
5356 if (result.get_jboolean()) {
5357 continue;
5358 }
5359
5360 if (not_first_ch) {
5361 // public static boolean isJavaIdentifierPart(char ch);
5362 JavaCalls::call_static(&result,
5363 SystemDictionary::Character_klass(),
5364 vmSymbols::isJavaIdentifierPart_name(),
5365 vmSymbols::int_bool_signature(),
5366 &args,
5367 THREAD);
5368
5369 if (HAS_PENDING_EXCEPTION) {
5370 CLEAR_PENDING_EXCEPTION;
5371 return 0;
5372 }
5373
5374 if (result.get_jboolean()) {
5375 continue;
5376 }
5377 }
5378 }
5379 return (not_first_ch) ? old_p : NULL;
5380 }
5381 return (not_first_ch) ? p : NULL;
5382 }
5383
5384 // Take pointer to a string. Skip over the longest part of the string that could
5385 // be taken as a field signature. Allow "void" if void_ok.
5386 // Return a pointer to just past the signature.
5387 // Return NULL if no legal signature is found.
5388 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5389 bool void_ok,
5390 unsigned int length,
5391 TRAPS) const {
5392 unsigned int array_dim = 0;
5393 while (length > 0) {
5394 switch (signature[0]) {
5395 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5396 case JVM_SIGNATURE_BOOLEAN:
5397 case JVM_SIGNATURE_BYTE:
5398 case JVM_SIGNATURE_CHAR:
5399 case JVM_SIGNATURE_SHORT:
5400 case JVM_SIGNATURE_INT:
5401 case JVM_SIGNATURE_FLOAT:
5402 case JVM_SIGNATURE_LONG:
5403 case JVM_SIGNATURE_DOUBLE:
5404 return signature + 1;
5405 case JVM_SIGNATURE_CLASS:
5406 {
5407 if (_major_version < JAVA_1_5_VERSION) {
5408 // Skip over the class name if one is there
5409 const char* const p = skip_over_field_name(signature + 1, true, --length);
5410
5411 // The next character better be a semicolon
5412 if (p && (p - signature) > 1 && p[0] == ';') {
5413 return p + 1;
5414 }
5415 }
5416 else {
5417 // Skip leading 'L' and ignore first appearance of ';'
5418 length--;
5419 signature++;
5420 char* c = strchr((char*) signature, ';');
5421 // Format check signature
5422 if (c != NULL) {
5423 ResourceMark rm(THREAD);
5424 int newlen = c - (char*) signature;
5425 char* sig = NEW_RESOURCE_ARRAY(char, newlen + 1);
5426 strncpy(sig, signature, newlen);
5427 sig[newlen] = '\0';
5428
5429 bool legal = verify_unqualified_name(sig, newlen, LegalClass);
5430 if (!legal) {
5431 classfile_parse_error("Class name contains illegal character "
5432 "in descriptor in class file %s",
5433 CHECK_0);
5434 return NULL;
5435 }
5436 return signature + newlen + 1;
5437 }
5438 }
5439 return NULL;
5440 }
5441 case JVM_SIGNATURE_ARRAY:
5442 array_dim++;
5443 if (array_dim > 255) {
5444 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5445 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5446 }
5447 // The rest of what's there better be a legal signature
5448 signature++;
5449 length--;
5450 void_ok = false;
5451 break;
5452 default:
5453 return NULL;
5454 }
5455 }
5456 return NULL;
5457 }
5458
5459 // Checks if name is a legal class name.
5460 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5461 if (!_need_verify || _relax_verify) { return; }
5462
5463 char buf[fixed_buffer_size];
5464 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5465 unsigned int length = name->utf8_length();
5466 bool legal = false;
5467
5468 if (length > 0) {
5469 const char* p;
5470 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5471 p = skip_over_field_signature(bytes, false, length, CHECK);
5472 legal = (p != NULL) && ((p - bytes) == (int)length);
5473 } else if (_major_version < JAVA_1_5_VERSION) {
5474 if (bytes[0] != '<') {
5475 p = skip_over_field_name(bytes, true, length);
5476 legal = (p != NULL) && ((p - bytes) == (int)length);
5477 }
5478 } else {
5479 // 4900761: relax the constraints based on JSR202 spec
5480 // Class names may be drawn from the entire Unicode character set.
5481 // Identifiers between '/' must be unqualified names.
5482 // The utf8 string has been verified when parsing cpool entries.
5483 legal = verify_unqualified_name(bytes, length, LegalClass);
5484 }
5485 }
5486 if (!legal) {
5487 ResourceMark rm(THREAD);
5488 assert(_class_name != NULL, "invariant");
5489 Exceptions::fthrow(
5490 THREAD_AND_LOCATION,
5491 vmSymbols::java_lang_ClassFormatError(),
5492 "Illegal class name \"%s\" in class file %s", bytes,
5493 _class_name->as_C_string()
5494 );
5495 return;
5496 }
5497 }
5498
5499 // Checks if name is a legal field name.
5500 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5501 if (!_need_verify || _relax_verify) { return; }
5502
5503 char buf[fixed_buffer_size];
5504 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5505 unsigned int length = name->utf8_length();
5506 bool legal = false;
5507
5508 if (length > 0) {
5509 if (_major_version < JAVA_1_5_VERSION) {
5510 if (bytes[0] != '<') {
5511 const char* p = skip_over_field_name(bytes, false, length);
5512 legal = (p != NULL) && ((p - bytes) == (int)length);
5513 }
5514 } else {
5515 // 4881221: relax the constraints based on JSR202 spec
5516 legal = verify_unqualified_name(bytes, length, LegalField);
5517 }
5518 }
5519
5520 if (!legal) {
5521 ResourceMark rm(THREAD);
5522 assert(_class_name != NULL, "invariant");
5523 Exceptions::fthrow(
5524 THREAD_AND_LOCATION,
5525 vmSymbols::java_lang_ClassFormatError(),
5526 "Illegal field name \"%s\" in class %s", bytes,
5527 _class_name->as_C_string()
5528 );
5529 return;
5530 }
5531 }
5532
5533 // Checks if name is a legal method name.
5534 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5535 if (!_need_verify || _relax_verify) { return; }
5536
5537 assert(name != NULL, "method name is null");
5538 char buf[fixed_buffer_size];
5539 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5540 unsigned int length = name->utf8_length();
5541 bool legal = false;
5542
5543 if (length > 0) {
5544 if (bytes[0] == '<') {
5545 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5546 legal = true;
5547 }
5548 } else if (_major_version < JAVA_1_5_VERSION) {
5549 const char* p;
5550 p = skip_over_field_name(bytes, false, length);
5551 legal = (p != NULL) && ((p - bytes) == (int)length);
5552 } else {
5553 // 4881221: relax the constraints based on JSR202 spec
5554 legal = verify_unqualified_name(bytes, length, LegalMethod);
5555 }
5556 }
5557
5558 if (!legal) {
5559 ResourceMark rm(THREAD);
5560 assert(_class_name != NULL, "invariant");
5561 Exceptions::fthrow(
5562 THREAD_AND_LOCATION,
5563 vmSymbols::java_lang_ClassFormatError(),
5564 "Illegal method name \"%s\" in class %s", bytes,
5565 _class_name->as_C_string()
5566 );
5567 return;
5568 }
5569 }
5570
5571
5572 // Checks if signature is a legal field signature.
5573 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5574 const Symbol* signature,
5575 TRAPS) const {
5576 if (!_need_verify) { return; }
5577
5578 char buf[fixed_buffer_size];
5579 const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5580 const unsigned int length = signature->utf8_length();
5581 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5582
5583 if (p == NULL || (p - bytes) != (int)length) {
5584 throwIllegalSignature("Field", name, signature, CHECK);
5585 }
5586 }
5587
5588 // Checks if signature is a legal method signature.
5589 // Returns number of parameters
5590 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5591 const Symbol* signature,
5592 TRAPS) const {
5593 if (!_need_verify) {
5594 // make sure caller's args_size will be less than 0 even for non-static
5595 // method so it will be recomputed in compute_size_of_parameters().
5596 return -2;
5597 }
5598
5599 // Class initializers cannot have args for class format version >= 51.
5600 if (name == vmSymbols::class_initializer_name() &&
5601 signature != vmSymbols::void_method_signature() &&
5602 _major_version >= JAVA_7_VERSION) {
5603 throwIllegalSignature("Method", name, signature, CHECK_0);
5604 return 0;
5605 }
5606
5607 unsigned int args_size = 0;
5608 char buf[fixed_buffer_size];
5609 const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5610 unsigned int length = signature->utf8_length();
5611 const char* nextp;
5612
5613 // The first character must be a '('
5614 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5615 length--;
5616 // Skip over legal field signatures
5617 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5618 while ((length > 0) && (nextp != NULL)) {
5619 args_size++;
5620 if (p[0] == 'J' || p[0] == 'D') {
5621 args_size++;
5622 }
5623 length -= nextp - p;
5624 p = nextp;
5625 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5626 }
5627 // The first non-signature thing better be a ')'
5628 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5629 length--;
5630 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5631 // All internal methods must return void
5632 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5633 return args_size;
5634 }
5635 } else {
5636 // Now we better just have a return value
5637 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5638 if (nextp && ((int)length == (nextp - p))) {
5639 return args_size;
5640 }
5641 }
5642 }
5643 }
5644 // Report error
5645 throwIllegalSignature("Method", name, signature, CHECK_0);
5646 return 0;
5647 }
5648
5649 int ClassFileParser::static_field_size() const {
5650 assert(_field_info != NULL, "invariant");
5651 return _field_info->static_field_size;
5652 }
5653
5654 int ClassFileParser::total_oop_map_count() const {
5655 assert(_field_info != NULL, "invariant");
5656 return _field_info->oop_map_blocks->nonstatic_oop_map_count;
5657 }
5658
5659 jint ClassFileParser::layout_size() const {
5660 assert(_field_info != NULL, "invariant");
5661 return _field_info->instance_size;
5662 }
5663
5664 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5665 const Array<Method*>* methods) {
5666 assert(ik != NULL, "invariant");
5667 assert(methods != NULL, "invariant");
5668
5669 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5670 // (We used to do this lazily, but now we query it in Rewriter,
5671 // which is eagerly done for every method, so we might as well do it now,
5672 // when everything is fresh in memory.)
5673 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5674
5675 if (klass_id != vmSymbols::NO_SID) {
5676 for (int j = 0; j < methods->length(); ++j) {
5677 Method* method = methods->at(j);
5678 method->init_intrinsic_id();
5679
5680 if (CheckIntrinsics) {
5681 // Check if an intrinsic is defined for method 'method',
5682 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5683 if (method->intrinsic_id() != vmIntrinsics::_none &&
5684 !method->intrinsic_candidate()) {
5685 tty->print("Compiler intrinsic is defined for method [%s], "
5686 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5687 method->name_and_sig_as_C_string(),
5688 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5689 );
5690 tty->cr();
5691 DEBUG_ONLY(vm_exit(1));
5692 }
5693 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5694 // but there is no intrinsic available for it.
5695 if (method->intrinsic_candidate() &&
5696 method->intrinsic_id() == vmIntrinsics::_none) {
5697 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5698 "but no compiler intrinsic is defined for the method.%s",
5699 method->name_and_sig_as_C_string(),
5700 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5701 );
5702 tty->cr();
5703 DEBUG_ONLY(vm_exit(1));
5704 }
5705 }
5706 } // end for
5707
5708 #ifdef ASSERT
5709 if (CheckIntrinsics) {
5710 // Check for orphan methods in the current class. A method m
5711 // of a class C is orphan if an intrinsic is defined for method m,
5712 // but class C does not declare m.
5713 // The check is potentially expensive, therefore it is available
5714 // only in debug builds.
5715
5716 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5717 if (vmIntrinsics::_compiledLambdaForm == id) {
5718 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5719 // generated for the JVM from a LambdaForm and therefore no method
5720 // is defined for it.
5721 continue;
5722 }
5723
5724 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5725 // Check if the current class contains a method with the same
5726 // name, flags, signature.
5727 bool match = false;
5728 for (int j = 0; j < methods->length(); ++j) {
5729 const Method* method = methods->at(j);
5730 if (method->intrinsic_id() == id) {
5731 match = true;
5732 break;
5733 }
5734 }
5735
5736 if (!match) {
5737 char buf[1000];
5738 tty->print("Compiler intrinsic is defined for method [%s], "
5739 "but the method is not available in class [%s].%s",
5740 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5741 buf, sizeof(buf)),
5742 ik->name()->as_C_string(),
5743 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5744 );
5745 tty->cr();
5746 DEBUG_ONLY(vm_exit(1));
5747 }
5748 }
5749 } // end for
5750 } // CheckIntrinsics
5751 #endif // ASSERT
5752 }
5753 }
5754
5755 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5756 if (_klass != NULL) {
5757 return _klass;
5758 }
5759
5760 InstanceKlass* const ik =
5761 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5762
5763 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5764
5765 assert(_klass == ik, "invariant");
5766
5767 ik->set_has_passed_fingerprint_check(false);
5768 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5769 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5770 if (aot_fp != 0 && aot_fp == _stream->compute_fingerprint()) {
5771 // This class matches with a class saved in an AOT library
5772 ik->set_has_passed_fingerprint_check(true);
5773 } else {
5774 ResourceMark rm;
5775 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5776 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5777 }
5778 }
5779
5780 if (ik->is_value()) {
5781 ValueKlass* vk = ValueKlass::cast(ik);
5782 oop val = ik->allocate_instance(CHECK_NULL);
5783 vk->set_default_value(val);
5784 }
5785
5786 return ik;
5787 }
5788
5789 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5790 assert(ik != NULL, "invariant");
5791
5792 // Set name and CLD before adding to CLD
5793 ik->set_class_loader_data(_loader_data);
5794 ik->set_name(_class_name);
5795
5796 // Add all classes to our internal class loader list here,
5797 // including classes in the bootstrap (NULL) class loader.
5798 const bool publicize = !is_internal();
5799
5800 _loader_data->add_class(ik, publicize);
5801
5802 set_klass_to_deallocate(ik);
5803
5804 assert(_field_info != NULL, "invariant");
5805 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5806 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->nonstatic_oop_map_count,
5807 "sanity");
5808
5809 assert(ik->is_instance_klass(), "sanity");
5810 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5811
5812 // Fill in information already parsed
5813 ik->set_should_verify_class(_need_verify);
5814
5815 // Not yet: supers are done below to support the new subtype-checking fields
5816 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5817 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5818 assert(_fac != NULL, "invariant");
5819 ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_FLATTENABLE]);
5820
5821 // this transfers ownership of a lot of arrays from
5822 // the parser onto the InstanceKlass*
5823 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5824
5825 // note that is not safe to use the fields in the parser from this point on
5826 assert(NULL == _cp, "invariant");
5827 assert(NULL == _fields, "invariant");
5828 assert(NULL == _methods, "invariant");
5829 assert(NULL == _inner_classes, "invariant");
5830 assert(NULL == _local_interfaces, "invariant");
5831 assert(NULL == _combined_annotations, "invariant");
5832
5833 if (_has_final_method) {
5834 ik->set_has_final_method();
5835 }
5836
5837 ik->copy_method_ordering(_method_ordering, CHECK);
5838 // The InstanceKlass::_methods_jmethod_ids cache
5839 // is managed on the assumption that the initial cache
5840 // size is equal to the number of methods in the class. If
5841 // that changes, then InstanceKlass::idnum_can_increment()
5842 // has to be changed accordingly.
5843 ik->set_initial_method_idnum(ik->methods()->length());
5844
5845 ik->set_this_class_index(_this_class_index);
5846
5847 if (is_anonymous()) {
5848 // _this_class_index is a CONSTANT_Class entry that refers to this
5849 // anonymous class itself. If this class needs to refer to its own methods or
5850 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5851 // _this_class_index. However, because this class is anonymous (it's
5852 // not stored in SystemDictionary), _this_class_index cannot be resolved
5853 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5854 // Therefore, we must eagerly resolve _this_class_index now.
5855 ik->constants()->klass_at_put(_this_class_index, ik);
5856 }
5857
5858 ik->set_minor_version(_minor_version);
5859 ik->set_major_version(_major_version);
5860 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5861 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5862
5863 if (_host_klass != NULL) {
5864 assert (ik->is_anonymous(), "should be the same");
5865 ik->set_host_klass(_host_klass);
5866 }
5867
5868 // Set PackageEntry for this_klass
5869 oop cl = ik->class_loader();
5870 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5871 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5872 ik->set_package(cld, CHECK);
5873
5874 const Array<Method*>* const methods = ik->methods();
5875 assert(methods != NULL, "invariant");
5876 const int methods_len = methods->length();
5877
5878 check_methods_for_intrinsics(ik, methods);
5879
5880 // Fill in field values obtained by parse_classfile_attributes
5881 if (_parsed_annotations->has_any_annotations()) {
5882 _parsed_annotations->apply_to(ik);
5883 }
5884
5885 apply_parsed_class_attributes(ik);
5886
5887 // Miranda methods
5888 if ((_num_miranda_methods > 0) ||
5889 // if this class introduced new miranda methods or
5890 (_super_klass != NULL && _super_klass->has_miranda_methods())
5891 // super class exists and this class inherited miranda methods
5892 ) {
5893 ik->set_has_miranda_methods(); // then set a flag
5894 }
5895
5896 // Fill in information needed to compute superclasses.
5897 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5898 ik->set_transitive_interfaces(_transitive_interfaces);
5899 _transitive_interfaces = NULL;
5900
5901 // Initialize itable offset tables
5902 klassItable::setup_itable_offset_table(ik);
5903
5904 // Compute transitive closure of interfaces this class implements
5905 // Do final class setup
5906 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5907 if (oop_map_blocks->nonstatic_oop_map_count > 0) {
5908 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5909 }
5910
5911 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5912 set_precomputed_flags(ik, CHECK);
5913
5914 // check if this class can access its super class
5915 check_super_class_access(ik, CHECK);
5916
5917 // check if this class can access its superinterfaces
5918 check_super_interface_access(ik, CHECK);
5919
5920 // check if this class overrides any final method
5921 check_final_method_override(ik, CHECK);
5922
5923 // reject static interface methods prior to Java 8
5924 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5925 check_illegal_static_method(ik, CHECK);
5926 }
5927
5928 // Obtain this_klass' module entry
5929 ModuleEntry* module_entry = ik->module();
5930 assert(module_entry != NULL, "module_entry should always be set");
5931
5932 // Obtain java.lang.Module
5933 Handle module_handle(THREAD, module_entry->module());
5934
5935 // Allocate mirror and initialize static fields
5936 // The create_mirror() call will also call compute_modifiers()
5937 java_lang_Class::create_mirror(ik,
5938 Handle(THREAD, _loader_data->class_loader()),
5939 module_handle,
5940 _protection_domain,
5941 CHECK);
5942
5943 assert(_all_mirandas != NULL, "invariant");
5944
5945 // Generate any default methods - default methods are public interface methods
5946 // that have a default implementation. This is new with Java 8.
5947 if (_has_nonstatic_concrete_methods) {
5948 DefaultMethods::generate_default_methods(ik,
5949 _all_mirandas,
5950 CHECK);
5951 }
5952
5953 if (is_value_type()) {
5954 ValueKlass* vk = ValueKlass::cast(ik);
5955 vk->set_if_bufferable();
5956 vk->initialize_calling_convention();
5957 }
5958
5959 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5960 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5961 !module_entry->has_default_read_edges()) {
5962 if (!module_entry->set_has_default_read_edges()) {
5963 // We won a potential race
5964 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5965 }
5966 }
5967
5968 int nfields = ik->java_fields_count();
5969 if (ik->is_value()) nfields++;
5970 for(int i = 0; i < nfields; i++) {
5971 if (ik->field_access_flags(i) & JVM_ACC_FLATTENABLE) {
5972 Klass* klass = SystemDictionary::resolve_or_fail(ik->field_signature(i),
5973 Handle(THREAD, ik->class_loader()),
5974 Handle(THREAD, ik->protection_domain()), true, CHECK);
5975 assert(klass != NULL, "Sanity check");
5976 assert(klass->access_flags().is_value_type(), "Value type expected");
5977 ik->set_value_field_klass(i, klass);
5978 } else if (is_value_type() && ((ik->field_access_flags(i) & JVM_ACC_FIELD_INTERNAL) != 0)
5979 && ((ik->field_access_flags(i) & JVM_ACC_STATIC) != 0)) {
5980 ValueKlass::cast(ik)->set_default_value_offset(ik->field_offset(i));
5981 }
5982 }
5983
5984 // Update the loader_data graph.
5985 record_defined_class_dependencies(ik, CHECK);
5986
5987 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5988
5989 if (!is_internal()) {
5990 if (log_is_enabled(Info, class, load)) {
5991 ResourceMark rm;
5992 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5993 ik->print_class_load_logging(_loader_data, module_name, _stream);
5994 }
5995
5996 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5997 ik->major_version() != JAVA_MIN_SUPPORTED_VERSION &&
5998 log_is_enabled(Info, class, preview)) {
5999 ResourceMark rm;
6000 log_info(class, preview)("Loading preview feature type %s", ik->external_name());
6001 }
6002
6003 if (log_is_enabled(Debug, class, resolve)) {
6004 ResourceMark rm;
6005 // print out the superclass.
6006 const char * from = ik->external_name();
6007 if (ik->java_super() != NULL) {
6008 log_debug(class, resolve)("%s %s (super)",
6009 from,
6010 ik->java_super()->external_name());
6011 }
6012 // print out each of the interface classes referred to by this class.
6013 const Array<Klass*>* const local_interfaces = ik->local_interfaces();
6014 if (local_interfaces != NULL) {
6015 const int length = local_interfaces->length();
6016 for (int i = 0; i < length; i++) {
6017 const Klass* const k = local_interfaces->at(i);
6018 const char * to = k->external_name();
6019 log_debug(class, resolve)("%s %s (interface)", from, to);
6020 }
6021 }
6022 }
6023 }
6024
6025 JFR_ONLY(INIT_ID(ik);)
6026
6027 // If we reach here, all is well.
6028 // Now remove the InstanceKlass* from the _klass_to_deallocate field
6029 // in order for it to not be destroyed in the ClassFileParser destructor.
6030 set_klass_to_deallocate(NULL);
6031
6032 // it's official
6033 set_klass(ik);
6034
6035 debug_only(ik->verify();)
6036 }
6037
6038 // For an anonymous class that is in the unnamed package, move it to its host class's
6039 // package by prepending its host class's package name to its class name and setting
6040 // its _class_name field.
6041 void ClassFileParser::prepend_host_package_name(const InstanceKlass* host_klass, TRAPS) {
6042 ResourceMark rm(THREAD);
6043 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
6044 "Anonymous class should not be in a package");
6045 const char* host_pkg_name =
6046 ClassLoader::package_from_name(host_klass->name()->as_C_string(), NULL);
6047
6048 if (host_pkg_name != NULL) {
6049 size_t host_pkg_len = strlen(host_pkg_name);
6050 int class_name_len = _class_name->utf8_length();
6051 char* new_anon_name =
6052 NEW_RESOURCE_ARRAY(char, host_pkg_len + 1 + class_name_len);
6053 // Copy host package name and trailing /.
6054 strncpy(new_anon_name, host_pkg_name, host_pkg_len);
6055 new_anon_name[host_pkg_len] = '/';
6056 // Append anonymous class name. The anonymous class name can contain odd
6057 // characters. So, do a strncpy instead of using sprintf("%s...").
6058 strncpy(new_anon_name + host_pkg_len + 1, (char *)_class_name->base(), class_name_len);
6059
6060 // Create a symbol and update the anonymous class name.
6061 _class_name = SymbolTable::new_symbol(new_anon_name,
6062 (int)host_pkg_len + 1 + class_name_len,
6063 CHECK);
6064 }
6065 }
6066
6067 // If the host class and the anonymous class are in the same package then do
6068 // nothing. If the anonymous class is in the unnamed package then move it to its
6069 // host's package. If the classes are in different packages then throw an IAE
6070 // exception.
6071 void ClassFileParser::fix_anonymous_class_name(TRAPS) {
6072 assert(_host_klass != NULL, "Expected an anonymous class");
6073
6074 const jbyte* anon_last_slash = UTF8::strrchr(_class_name->base(),
6075 _class_name->utf8_length(), '/');
6076 if (anon_last_slash == NULL) { // Unnamed package
6077 prepend_host_package_name(_host_klass, CHECK);
6078 } else {
6079 if (!_host_klass->is_same_class_package(_host_klass->class_loader(), _class_name)) {
6080 ResourceMark rm(THREAD);
6081 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
6082 err_msg("Host class %s and anonymous class %s are in different packages",
6083 _host_klass->name()->as_C_string(), _class_name->as_C_string()));
6084 }
6085 }
6086 }
6087
6088 static bool relax_format_check_for(ClassLoaderData* loader_data) {
6089 bool trusted = (loader_data->is_the_null_class_loader_data() ||
6090 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
6091 bool need_verify =
6092 // verifyAll
6093 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
6094 // verifyRemote
6095 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
6096 return !need_verify;
6097 }
6098
6099 ClassFileParser::ClassFileParser(ClassFileStream* stream,
6100 Symbol* name,
6101 ClassLoaderData* loader_data,
6102 Handle protection_domain,
6103 const InstanceKlass* host_klass,
6104 GrowableArray<Handle>* cp_patches,
6105 Publicity pub_level,
6106 TRAPS) :
6107 _stream(stream),
6108 _requested_name(name),
6109 _loader_data(loader_data),
6110 _host_klass(host_klass),
6111 _cp_patches(cp_patches),
6112 _num_patched_klasses(0),
6113 _max_num_patched_klasses(0),
6114 _orig_cp_size(0),
6115 _first_patched_klass_resolved_index(0),
6116 _super_klass(),
6117 _cp(NULL),
6118 _fields(NULL),
6119 _methods(NULL),
6120 _inner_classes(NULL),
6121 _value_types(NULL),
6122 _local_interfaces(NULL),
6123 _transitive_interfaces(NULL),
6124 _combined_annotations(NULL),
6125 _annotations(NULL),
6126 _type_annotations(NULL),
6127 _fields_annotations(NULL),
6128 _fields_type_annotations(NULL),
6129 _klass(NULL),
6130 _klass_to_deallocate(NULL),
6131 _parsed_annotations(NULL),
6132 _fac(NULL),
6133 _field_info(NULL),
6134 _method_ordering(NULL),
6135 _all_mirandas(NULL),
6136 _vtable_size(0),
6137 _itable_size(0),
6138 _num_miranda_methods(0),
6139 _rt(REF_NONE),
6140 _protection_domain(protection_domain),
6141 _access_flags(),
6142 _pub_level(pub_level),
6143 _bad_constant_seen(0),
6144 _synthetic_flag(false),
6145 _sde_length(false),
6146 _sde_buffer(NULL),
6147 _sourcefile_index(0),
6148 _generic_signature_index(0),
6149 _major_version(0),
6150 _minor_version(0),
6151 _this_class_index(0),
6152 _super_class_index(0),
6153 _itfs_len(0),
6154 _java_fields_count(0),
6155 _need_verify(false),
6156 _relax_verify(false),
6157 _has_nonstatic_concrete_methods(false),
6158 _declares_nonstatic_concrete_methods(false),
6159 _has_final_method(false),
6160 _has_finalizer(false),
6161 _has_empty_finalizer(false),
6162 _has_vanilla_constructor(false),
6163 _max_bootstrap_specifier_index(-1),
6164 _has_flattenable_fields(false) {
6165
6166 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6167
6168 assert(THREAD->is_Java_thread(), "invariant");
6169 assert(_loader_data != NULL, "invariant");
6170 assert(stream != NULL, "invariant");
6171 assert(_stream != NULL, "invariant");
6172 assert(_stream->buffer() == _stream->current(), "invariant");
6173 assert(_class_name != NULL, "invariant");
6174 assert(0 == _access_flags.as_int(), "invariant");
6175
6176 // Figure out whether we can skip format checking (matching classic VM behavior)
6177 if (DumpSharedSpaces) {
6178 // verify == true means it's a 'remote' class (i.e., non-boot class)
6179 // Verification decision is based on BytecodeVerificationRemote flag
6180 // for those classes.
6181 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
6182 BytecodeVerificationLocal;
6183 }
6184 else {
6185 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
6186 stream->need_verify());
6187 }
6188 if (_cp_patches != NULL) {
6189 int len = _cp_patches->length();
6190 for (int i=0; i<len; i++) {
6191 if (has_cp_patch_at(i)) {
6192 Handle patch = cp_patch_at(i);
6193 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
6194 // We need to append the names of the patched classes to the end of the constant pool,
6195 // because a patched class may have a Utf8 name that's not already included in the
6196 // original constant pool. These class names are used when patch_constant_pool()
6197 // calls patch_class().
6198 //
6199 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
6200 // At this point, we don't know the tag for index i yet, because we haven't parsed the
6201 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
6202 _max_num_patched_klasses++;
6203 }
6204 }
6205 }
6206 }
6207
6208 // synch back verification state to stream
6209 stream->set_verify(_need_verify);
6210
6211 // Check if verification needs to be relaxed for this class file
6212 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
6213 _relax_verify = relax_format_check_for(_loader_data);
6214
6215 parse_stream(stream, CHECK);
6216
6217 post_process_parsed_stream(stream, _cp, CHECK);
6218 }
6219
6220 void ClassFileParser::clear_class_metadata() {
6221 // metadata created before the instance klass is created. Must be
6222 // deallocated if classfile parsing returns an error.
6223 _cp = NULL;
6224 _fields = NULL;
6225 _methods = NULL;
6226 _inner_classes = NULL;
6227 _local_interfaces = NULL;
6228 _combined_annotations = NULL;
6229 _annotations = _type_annotations = NULL;
6230 _fields_annotations = _fields_type_annotations = NULL;
6231 }
6232
6233 // Destructor to clean up
6234 ClassFileParser::~ClassFileParser() {
6235 if (_cp != NULL) {
6236 MetadataFactory::free_metadata(_loader_data, _cp);
6237 }
6238 if (_fields != NULL) {
6239 MetadataFactory::free_array<u2>(_loader_data, _fields);
6240 }
6241
6242 if (_methods != NULL) {
6243 // Free methods
6244 InstanceKlass::deallocate_methods(_loader_data, _methods);
6245 }
6246
6247 // beware of the Universe::empty_blah_array!!
6248 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6249 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6250 }
6251
6252 // Free interfaces
6253 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6254 _local_interfaces, _transitive_interfaces);
6255
6256 if (_combined_annotations != NULL) {
6257 // After all annotations arrays have been created, they are installed into the
6258 // Annotations object that will be assigned to the InstanceKlass being created.
6259
6260 // Deallocate the Annotations object and the installed annotations arrays.
6261 _combined_annotations->deallocate_contents(_loader_data);
6262
6263 // If the _combined_annotations pointer is non-NULL,
6264 // then the other annotations fields should have been cleared.
6265 assert(_annotations == NULL, "Should have been cleared");
6266 assert(_type_annotations == NULL, "Should have been cleared");
6267 assert(_fields_annotations == NULL, "Should have been cleared");
6268 assert(_fields_type_annotations == NULL, "Should have been cleared");
6269 } else {
6270 // If the annotations arrays were not installed into the Annotations object,
6271 // then they have to be deallocated explicitly.
6272 MetadataFactory::free_array<u1>(_loader_data, _annotations);
6273 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
6274 Annotations::free_contents(_loader_data, _fields_annotations);
6275 Annotations::free_contents(_loader_data, _fields_type_annotations);
6276 }
6277
6278 clear_class_metadata();
6279 _transitive_interfaces = NULL;
6280
6281 // deallocate the klass if already created. Don't directly deallocate, but add
6282 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6283 // at a safepoint.
6284 if (_klass_to_deallocate != NULL) {
6285 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6286 }
6287 }
6288
6289 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6290 TRAPS) {
6291
6292 assert(stream != NULL, "invariant");
6293 assert(_class_name != NULL, "invariant");
6294
6295 // BEGIN STREAM PARSING
6296 stream->guarantee_more(8, CHECK); // magic, major, minor
6297 // Magic value
6298 const u4 magic = stream->get_u4_fast();
6299 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6300 "Incompatible magic value %u in class file %s",
6301 magic, CHECK);
6302
6303 // Version numbers
6304 _minor_version = stream->get_u2_fast();
6305 _major_version = stream->get_u2_fast();
6306
6307 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) {
6308 ResourceMark rm;
6309 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
6310 _major_version, _minor_version, _class_name->as_C_string());
6311 Exceptions::fthrow(
6312 THREAD_AND_LOCATION,
6313 vmSymbols::java_lang_UnsupportedClassVersionError(),
6314 "Unsupported major.minor version for dump time %u.%u",
6315 _major_version,
6316 _minor_version);
6317 }
6318
6319 // Check version numbers - we check this even with verifier off
6320 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6321
6322 stream->guarantee_more(3, CHECK); // length, first cp tag
6323 u2 cp_size = stream->get_u2_fast();
6324
6325 guarantee_property(
6326 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6327 cp_size, CHECK);
6328
6329 _orig_cp_size = cp_size;
6330 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6331 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6332 }
6333 cp_size += _max_num_patched_klasses;
6334
6335 _cp = ConstantPool::allocate(_loader_data,
6336 cp_size,
6337 CHECK);
6338
6339 ConstantPool* const cp = _cp;
6340
6341 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6342
6343 assert(cp_size == (const u2)cp->length(), "invariant");
6344
6345 // ACCESS FLAGS
6346 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6347
6348 jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
6349 // JVM_ACC_MODULE is defined in JDK-9 and later.
6350 if (_major_version >= JAVA_9_VERSION) {
6351 recognized_modifiers |= JVM_ACC_MODULE;
6352 }
6353 // JVM_ACC_VALUE is defined for class file version 55 and later
6354 if (supports_value_types()) {
6355 recognized_modifiers |= JVM_ACC_VALUE;
6356 }
6357
6358 // Access flags
6359 jint flags = stream->get_u2_fast() & recognized_modifiers;
6360
6361 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6362 // Set abstract bit for old class files for backward compatibility
6363 flags |= JVM_ACC_ABSTRACT;
6364 }
6365
6366 verify_legal_class_modifiers(flags, CHECK);
6367
6368 short bad_constant = class_bad_constant_seen();
6369 if (bad_constant != 0) {
6370 // Do not throw CFE until after the access_flags are checked because if
6371 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6372 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6373 }
6374
6375 _access_flags.set_flags(flags);
6376
6377 // This class and superclass
6378 _this_class_index = stream->get_u2_fast();
6379 check_property(
6380 valid_cp_range(_this_class_index, cp_size) &&
6381 cp->tag_at(_this_class_index).is_unresolved_klass(),
6382 "Invalid this class index %u in constant pool in class file %s",
6383 _this_class_index, CHECK);
6384
6385 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6386 assert(class_name_in_cp != NULL, "class_name can't be null");
6387
6388 // Update _class_name which could be null previously
6389 // to reflect the name in the constant pool
6390 _class_name = class_name_in_cp;
6391
6392 // Don't need to check whether this class name is legal or not.
6393 // It has been checked when constant pool is parsed.
6394 // However, make sure it is not an array type.
6395 if (_need_verify) {
6396 guarantee_property(_class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
6397 "Bad class name in class file %s",
6398 CHECK);
6399 }
6400
6401 // Checks if name in class file matches requested name
6402 if (_requested_name != NULL && _requested_name != _class_name) {
6403 ResourceMark rm(THREAD);
6404 Exceptions::fthrow(
6405 THREAD_AND_LOCATION,
6406 vmSymbols::java_lang_NoClassDefFoundError(),
6407 "%s (wrong name: %s)",
6408 _class_name->as_C_string(),
6409 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6410 );
6411 return;
6412 }
6413
6414 // if this is an anonymous class fix up its name if it's in the unnamed
6415 // package. Otherwise, throw IAE if it is in a different package than
6416 // its host class.
6417 if (_host_klass != NULL) {
6418 fix_anonymous_class_name(CHECK);
6419 }
6420
6421 // Verification prevents us from creating names with dots in them, this
6422 // asserts that that's the case.
6423 assert(is_internal_format(_class_name), "external class name format used internally");
6424
6425 if (!is_internal()) {
6426 LogTarget(Debug, class, preorder) lt;
6427 if (lt.is_enabled()){
6428 ResourceMark rm(THREAD);
6429 LogStream ls(lt);
6430 ls.print("%s", _class_name->as_klass_external_name());
6431 if (stream->source() != NULL) {
6432 ls.print(" source: %s", stream->source());
6433 }
6434 ls.cr();
6435 }
6436
6437 #if INCLUDE_CDS
6438 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6439 if (!ClassLoader::has_jrt_entry()) {
6440 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6441 DumpLoadedClassList = NULL;
6442 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6443 _host_klass == NULL) {
6444 // Only dump the classes that can be stored into CDS archive.
6445 // Anonymous classes such as generated LambdaForm classes are also not included.
6446 oop class_loader = _loader_data->class_loader();
6447 ResourceMark rm(THREAD);
6448 bool skip = false;
6449 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6450 // For the boot and platform class loaders, skip classes that are not found in the
6451 // java runtime image, such as those found in the --patch-module entries.
6452 // These classes can't be loaded from the archive during runtime.
6453 if (!ClassLoader::is_modules_image(stream->source()) && strncmp(stream->source(), "jrt:", 4) != 0) {
6454 skip = true;
6455 }
6456
6457 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6458 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6459 // as they can be loaded from the archive during runtime.
6460 skip = false;
6461 }
6462 }
6463 if (skip) {
6464 tty->print_cr("skip writing class %s from source %s to classlist file",
6465 _class_name->as_C_string(), stream->source());
6466 } else {
6467 classlist_file->print_cr("%s", _class_name->as_C_string());
6468 classlist_file->flush();
6469 }
6470 }
6471 }
6472 #endif
6473 }
6474
6475 // SUPERKLASS
6476 _super_class_index = stream->get_u2_fast();
6477 _super_klass = parse_super_class(cp,
6478 _super_class_index,
6479 _need_verify,
6480 CHECK);
6481
6482 // Interfaces
6483 _itfs_len = stream->get_u2_fast();
6484 parse_interfaces(stream,
6485 _itfs_len,
6486 cp,
6487 &_has_nonstatic_concrete_methods,
6488 CHECK);
6489
6490 assert(_local_interfaces != NULL, "invariant");
6491
6492 // Fields (offsets are filled in later)
6493 _fac = new FieldAllocationCount();
6494 parse_fields(stream,
6495 _access_flags.is_interface(),
6496 _access_flags.is_value_type(),
6497 _fac,
6498 cp,
6499 cp_size,
6500 &_java_fields_count,
6501 CHECK);
6502
6503 assert(_fields != NULL, "invariant");
6504
6505 // Methods
6506 AccessFlags promoted_flags;
6507 parse_methods(stream,
6508 _access_flags.is_interface(),
6509 _access_flags.is_value_type(),
6510 &promoted_flags,
6511 &_has_final_method,
6512 &_declares_nonstatic_concrete_methods,
6513 CHECK);
6514
6515 assert(_methods != NULL, "invariant");
6516
6517 // promote flags from parse_methods() to the klass' flags
6518 _access_flags.add_promoted_flags(promoted_flags.as_int());
6519
6520 if (_declares_nonstatic_concrete_methods) {
6521 _has_nonstatic_concrete_methods = true;
6522 }
6523
6524 // Additional attributes/annotations
6525 _parsed_annotations = new ClassAnnotationCollector();
6526 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6527
6528 assert(_inner_classes != NULL, "invariant");
6529
6530 // Finalize the Annotations metadata object,
6531 // now that all annotation arrays have been created.
6532 create_combined_annotations(CHECK);
6533
6534 // Make sure this is the end of class file stream
6535 guarantee_property(stream->at_eos(),
6536 "Extra bytes at the end of class file %s",
6537 CHECK);
6538
6539 // all bytes in stream read and parsed
6540 }
6541
6542 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6543 ConstantPool* cp,
6544 TRAPS) {
6545 assert(stream != NULL, "invariant");
6546 assert(stream->at_eos(), "invariant");
6547 assert(cp != NULL, "invariant");
6548 assert(_loader_data != NULL, "invariant");
6549
6550 if (_class_name == vmSymbols::java_lang_Object()) {
6551 check_property(_local_interfaces == Universe::the_empty_klass_array(),
6552 "java.lang.Object cannot implement an interface in class file %s",
6553 CHECK);
6554 }
6555 // We check super class after class file is parsed and format is checked
6556 if (_super_class_index > 0 && NULL ==_super_klass) {
6557 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6558 if (_access_flags.is_interface()) {
6559 // Before attempting to resolve the superclass, check for class format
6560 // errors not checked yet.
6561 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6562 "Interfaces must have java.lang.Object as superclass in class file %s",
6563 CHECK);
6564 }
6565 Handle loader(THREAD, _loader_data->class_loader());
6566 _super_klass = (const InstanceKlass*)
6567 SystemDictionary::resolve_super_or_fail(_class_name,
6568 super_class_name,
6569 loader,
6570 _protection_domain,
6571 true,
6572 CHECK);
6573 }
6574
6575 if (_super_klass != NULL) {
6576 if (_super_klass->has_nonstatic_concrete_methods()) {
6577 _has_nonstatic_concrete_methods = true;
6578 }
6579
6580 if (_super_klass->is_interface()) {
6581 ResourceMark rm(THREAD);
6582 Exceptions::fthrow(
6583 THREAD_AND_LOCATION,
6584 vmSymbols::java_lang_IncompatibleClassChangeError(),
6585 "class %s has interface %s as super class",
6586 _class_name->as_klass_external_name(),
6587 _super_klass->external_name()
6588 );
6589 return;
6590 }
6591
6592 // For a value class, only java/lang/Object is an acceptable super class
6593 if (_access_flags.get_flags() & JVM_ACC_VALUE) {
6594 guarantee_property(_super_klass->name() == vmSymbols::java_lang_Object(),
6595 "Value type must have java.lang.Object as superclass in class file %s",
6596 CHECK);
6597 }
6598
6599 // Make sure super class is not final
6600 if (_super_klass->is_final()) {
6601 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6602 }
6603 }
6604
6605 // Compute the transitive list of all unique interfaces implemented by this class
6606 _transitive_interfaces =
6607 compute_transitive_interfaces(_super_klass,
6608 _local_interfaces,
6609 _loader_data,
6610 CHECK);
6611
6612 assert(_transitive_interfaces != NULL, "invariant");
6613
6614 // sort methods
6615 _method_ordering = sort_methods(_methods);
6616
6617 _all_mirandas = new GrowableArray<Method*>(20);
6618
6619 Handle loader(THREAD, _loader_data->class_loader());
6620 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6621 &_num_miranda_methods,
6622 _all_mirandas,
6623 _super_klass,
6624 _methods,
6625 _access_flags,
6626 _major_version,
6627 loader,
6628 _class_name,
6629 _local_interfaces,
6630 CHECK);
6631
6632 // Size of Java itable (in words)
6633 _itable_size = _access_flags.is_interface() ? 0 :
6634 klassItable::compute_itable_size(_transitive_interfaces);
6635
6636 assert(_fac != NULL, "invariant");
6637 assert(_parsed_annotations != NULL, "invariant");
6638
6639 _field_info = new FieldLayoutInfo();
6640 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6641
6642 // Compute reference typ
6643 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6644
6645 }
6646
6647 void ClassFileParser::set_klass(InstanceKlass* klass) {
6648
6649 #ifdef ASSERT
6650 if (klass != NULL) {
6651 assert(NULL == _klass, "leaking?");
6652 }
6653 #endif
6654
6655 _klass = klass;
6656 }
6657
6658 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6659
6660 #ifdef ASSERT
6661 if (klass != NULL) {
6662 assert(NULL == _klass_to_deallocate, "leaking?");
6663 }
6664 #endif
6665
6666 _klass_to_deallocate = klass;
6667 }
6668
6669 // Caller responsible for ResourceMark
6670 // clone stream with rewound position
6671 const ClassFileStream* ClassFileParser::clone_stream() const {
6672 assert(_stream != NULL, "invariant");
6673
6674 return _stream->clone();
6675 }
6676
6677 // ----------------------------------------------------------------------------
6678 // debugging
6679
6680 #ifdef ASSERT
6681
6682 // return true if class_name contains no '.' (internal format is '/')
6683 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6684 if (class_name != NULL) {
6685 ResourceMark rm;
6686 char* name = class_name->as_C_string();
6687 return strchr(name, '.') == NULL;
6688 } else {
6689 return true;
6690 }
6691 }
6692
6693 #endif