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 #define JAVA_12_VERSION 56
122
123 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
124 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION,
125 "Unexpected bad constant pool entry");
126 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
127 }
128
129 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
130 ConstantPool* cp,
131 const int length,
132 TRAPS) {
133 assert(stream != NULL, "invariant");
134 assert(cp != NULL, "invariant");
135
136 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
137 // this function (_current can be allocated in a register, with scalar
138 // replacement of aggregates). The _current pointer is copied back to
139 // stream() when this function returns. DON'T call another method within
140 // this method that uses stream().
141 const ClassFileStream cfs1 = *stream;
142 const ClassFileStream* const cfs = &cfs1;
143
144 assert(cfs->allocated_on_stack(), "should be local");
145 debug_only(const u1* const old_current = stream->current();)
146
147 // Used for batching symbol allocations.
148 const char* names[SymbolTable::symbol_alloc_batch_size];
149 int lengths[SymbolTable::symbol_alloc_batch_size];
150 int indices[SymbolTable::symbol_alloc_batch_size];
151 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
152 int names_count = 0;
153
154 // parsing Index 0 is unused
155 for (int index = 1; index < length; index++) {
156 // Each of the following case guarantees one more byte in the stream
157 // for the following tag or the access_flags following constant pool,
158 // so we don't need bounds-check for reading tag.
159 const u1 tag = cfs->get_u1_fast();
160 switch (tag) {
161 case JVM_CONSTANT_Class: {
162 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
163 const u2 name_index = cfs->get_u2_fast();
164 cp->klass_index_at_put(index, name_index);
165 break;
166 }
167 case JVM_CONSTANT_Fieldref: {
168 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
169 const u2 class_index = cfs->get_u2_fast();
170 const u2 name_and_type_index = cfs->get_u2_fast();
171 cp->field_at_put(index, class_index, name_and_type_index);
172 break;
173 }
174 case JVM_CONSTANT_Methodref: {
175 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
176 const u2 class_index = cfs->get_u2_fast();
177 const u2 name_and_type_index = cfs->get_u2_fast();
178 cp->method_at_put(index, class_index, name_and_type_index);
179 break;
180 }
181 case JVM_CONSTANT_InterfaceMethodref: {
182 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
183 const u2 class_index = cfs->get_u2_fast();
184 const u2 name_and_type_index = cfs->get_u2_fast();
185 cp->interface_method_at_put(index, class_index, name_and_type_index);
186 break;
187 }
188 case JVM_CONSTANT_String : {
189 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
190 const u2 string_index = cfs->get_u2_fast();
191 cp->string_index_at_put(index, string_index);
192 break;
193 }
194 case JVM_CONSTANT_MethodHandle :
195 case JVM_CONSTANT_MethodType: {
196 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
197 classfile_parse_error(
198 "Class file version does not support constant tag %u in class file %s",
199 tag, CHECK);
200 }
201 if (tag == JVM_CONSTANT_MethodHandle) {
202 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
203 const u1 ref_kind = cfs->get_u1_fast();
204 const u2 method_index = cfs->get_u2_fast();
205 cp->method_handle_index_at_put(index, ref_kind, method_index);
206 }
207 else if (tag == JVM_CONSTANT_MethodType) {
208 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
209 const u2 signature_index = cfs->get_u2_fast();
210 cp->method_type_index_at_put(index, signature_index);
211 }
212 else {
213 ShouldNotReachHere();
214 }
215 break;
216 }
217 case JVM_CONSTANT_Dynamic : {
218 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
219 classfile_parse_error(
220 "Class file version does not support constant tag %u in class file %s",
221 tag, CHECK);
222 }
223 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
224 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
225 const u2 name_and_type_index = cfs->get_u2_fast();
226 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
227 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
228 }
229 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
230 break;
231 }
232 case JVM_CONSTANT_InvokeDynamic : {
233 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
234 classfile_parse_error(
235 "Class file version does not support constant tag %u in class file %s",
236 tag, CHECK);
237 }
238 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
239 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
240 const u2 name_and_type_index = cfs->get_u2_fast();
241 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
242 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
243 }
244 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
245 break;
246 }
247 case JVM_CONSTANT_Integer: {
248 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
249 const u4 bytes = cfs->get_u4_fast();
250 cp->int_at_put(index, (jint)bytes);
251 break;
252 }
253 case JVM_CONSTANT_Float: {
254 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
255 const u4 bytes = cfs->get_u4_fast();
256 cp->float_at_put(index, *(jfloat*)&bytes);
257 break;
258 }
259 case JVM_CONSTANT_Long: {
260 // A mangled type might cause you to overrun allocated memory
261 guarantee_property(index + 1 < length,
262 "Invalid constant pool entry %u in class file %s",
263 index,
264 CHECK);
265 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
266 const u8 bytes = cfs->get_u8_fast();
267 cp->long_at_put(index, bytes);
268 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
269 break;
270 }
271 case JVM_CONSTANT_Double: {
272 // A mangled type might cause you to overrun allocated memory
273 guarantee_property(index+1 < length,
274 "Invalid constant pool entry %u in class file %s",
275 index,
276 CHECK);
277 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
278 const u8 bytes = cfs->get_u8_fast();
279 cp->double_at_put(index, *(jdouble*)&bytes);
280 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
281 break;
282 }
283 case JVM_CONSTANT_NameAndType: {
284 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
285 const u2 name_index = cfs->get_u2_fast();
286 const u2 signature_index = cfs->get_u2_fast();
287 cp->name_and_type_at_put(index, name_index, signature_index);
288 break;
289 }
290 case JVM_CONSTANT_Utf8 : {
291 cfs->guarantee_more(2, CHECK); // utf8_length
292 u2 utf8_length = cfs->get_u2_fast();
293 const u1* utf8_buffer = cfs->current();
294 assert(utf8_buffer != NULL, "null utf8 buffer");
295 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
296 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
297 cfs->skip_u1_fast(utf8_length);
298
299 // Before storing the symbol, make sure it's legal
300 if (_need_verify) {
301 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
302 }
303
304 if (has_cp_patch_at(index)) {
305 Handle patch = clear_cp_patch_at(index);
306 guarantee_property(java_lang_String::is_instance(patch()),
307 "Illegal utf8 patch at %d in class file %s",
308 index,
309 CHECK);
310 const char* const str = java_lang_String::as_utf8_string(patch());
311 // (could use java_lang_String::as_symbol instead, but might as well batch them)
312 utf8_buffer = (const u1*) str;
313 utf8_length = (int) strlen(str);
314 }
315
316 unsigned int hash;
317 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
318 utf8_length,
319 hash);
320 if (result == NULL) {
321 names[names_count] = (const char*)utf8_buffer;
322 lengths[names_count] = utf8_length;
323 indices[names_count] = index;
324 hashValues[names_count++] = hash;
325 if (names_count == SymbolTable::symbol_alloc_batch_size) {
326 SymbolTable::new_symbols(_loader_data,
327 cp,
328 names_count,
329 names,
330 lengths,
331 indices,
332 hashValues,
333 CHECK);
334 names_count = 0;
335 }
336 } else {
337 cp->symbol_at_put(index, result);
338 }
339 break;
340 }
341 case 19:
342 case 20: {
343 // Record that an error occurred in these two cases but keep parsing so
344 // that ACC_Module can be checked for in the access_flags. Need to
345 // throw NoClassDefFoundError in that case.
346 if (_major_version >= JAVA_9_VERSION) {
347 cfs->guarantee_more(3, CHECK);
348 cfs->get_u2_fast();
349 set_class_bad_constant_seen(tag);
350 break;
351 }
352 }
353 default: {
354 classfile_parse_error("Unknown constant tag %u in class file %s",
355 tag,
356 CHECK);
357 break;
358 }
359 } // end of switch(tag)
360 } // end of for
361
362 // Allocate the remaining symbols
363 if (names_count > 0) {
364 SymbolTable::new_symbols(_loader_data,
365 cp,
366 names_count,
367 names,
368 lengths,
369 indices,
370 hashValues,
371 CHECK);
372 }
373
374 // Copy _current pointer of local copy back to stream.
375 assert(stream->current() == old_current, "non-exclusive use of stream");
376 stream->set_current(cfs1.current());
377
378 }
379
380 static inline bool valid_cp_range(int index, int length) {
381 return (index > 0 && index < length);
382 }
383
384 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
385 assert(cp != NULL, "invariant");
386 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
387 return cp->symbol_at(index);
388 }
389 return NULL;
390 }
391
392 #ifdef ASSERT
393 PRAGMA_DIAG_PUSH
394 PRAGMA_FORMAT_NONLITERAL_IGNORED
395 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
396 ResourceMark rm(THREAD);
397 fatal(msg, _class_name->as_C_string());
398 }
399
400 void ClassFileParser::report_assert_property_failure(const char* msg,
401 int index,
402 TRAPS) const {
403 ResourceMark rm(THREAD);
404 fatal(msg, index, _class_name->as_C_string());
405 }
406 PRAGMA_DIAG_POP
407 #endif
408
409 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
410 ConstantPool* const cp,
411 const int length,
412 TRAPS) {
413 assert(cp != NULL, "invariant");
414 assert(stream != NULL, "invariant");
415
416 // parsing constant pool entries
417 parse_constant_pool_entries(stream, cp, length, CHECK);
418 if (class_bad_constant_seen() != 0) {
419 // a bad CP entry has been detected previously so stop parsing and just return.
420 return;
421 }
422
423 int index = 1; // declared outside of loops for portability
424 int num_klasses = 0;
425
426 // first verification pass - validate cross references
427 // and fixup class and string constants
428 for (index = 1; index < length; index++) { // Index 0 is unused
429 const jbyte tag = cp->tag_at(index).value();
430 switch (tag) {
431 case JVM_CONSTANT_Class: {
432 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
433 break;
434 }
435 case JVM_CONSTANT_Fieldref:
436 // fall through
437 case JVM_CONSTANT_Methodref:
438 // fall through
439 case JVM_CONSTANT_InterfaceMethodref: {
440 if (!_need_verify) break;
441 const int klass_ref_index = cp->klass_ref_index_at(index);
442 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
443 check_property(valid_klass_reference_at(klass_ref_index),
444 "Invalid constant pool index %u in class file %s",
445 klass_ref_index, CHECK);
446 check_property(valid_cp_range(name_and_type_ref_index, length) &&
447 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
448 "Invalid constant pool index %u in class file %s",
449 name_and_type_ref_index, CHECK);
450 break;
451 }
452 case JVM_CONSTANT_String: {
453 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
454 break;
455 }
456 case JVM_CONSTANT_Integer:
457 break;
458 case JVM_CONSTANT_Float:
459 break;
460 case JVM_CONSTANT_Long:
461 case JVM_CONSTANT_Double: {
462 index++;
463 check_property(
464 (index < length && cp->tag_at(index).is_invalid()),
465 "Improper constant pool long/double index %u in class file %s",
466 index, CHECK);
467 break;
468 }
469 case JVM_CONSTANT_NameAndType: {
470 if (!_need_verify) break;
471 const int name_ref_index = cp->name_ref_index_at(index);
472 const int signature_ref_index = cp->signature_ref_index_at(index);
473 check_property(valid_symbol_at(name_ref_index),
474 "Invalid constant pool index %u in class file %s",
475 name_ref_index, CHECK);
476 check_property(valid_symbol_at(signature_ref_index),
477 "Invalid constant pool index %u in class file %s",
478 signature_ref_index, CHECK);
479 break;
480 }
481 case JVM_CONSTANT_Utf8:
482 break;
483 case JVM_CONSTANT_UnresolvedClass: // fall-through
484 case JVM_CONSTANT_UnresolvedClassInError: {
485 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
486 break;
487 }
488 case JVM_CONSTANT_ClassIndex: {
489 const int class_index = cp->klass_index_at(index);
490 check_property(valid_symbol_at(class_index),
491 "Invalid constant pool index %u in class file %s",
492 class_index, CHECK);
493
494 Symbol* const name = cp->symbol_at(class_index);
495 const unsigned int name_len = name->utf8_length();
496
497 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
498 break;
499 }
500 case JVM_CONSTANT_StringIndex: {
501 const int string_index = cp->string_index_at(index);
502 check_property(valid_symbol_at(string_index),
503 "Invalid constant pool index %u in class file %s",
504 string_index, CHECK);
505 Symbol* const sym = cp->symbol_at(string_index);
506 cp->unresolved_string_at_put(index, sym);
507 break;
508 }
509 case JVM_CONSTANT_MethodHandle: {
510 const int ref_index = cp->method_handle_index_at(index);
511 check_property(valid_cp_range(ref_index, length),
512 "Invalid constant pool index %u in class file %s",
513 ref_index, CHECK);
514 const constantTag tag = cp->tag_at(ref_index);
515 const int ref_kind = cp->method_handle_ref_kind_at(index);
516
517 switch (ref_kind) {
518 case JVM_REF_getField:
519 case JVM_REF_getStatic:
520 case JVM_REF_putField:
521 case JVM_REF_putStatic: {
522 check_property(
523 tag.is_field(),
524 "Invalid constant pool index %u in class file %s (not a field)",
525 ref_index, CHECK);
526 break;
527 }
528 case JVM_REF_invokeVirtual:
529 case JVM_REF_newInvokeSpecial: {
530 check_property(
531 tag.is_method(),
532 "Invalid constant pool index %u in class file %s (not a method)",
533 ref_index, CHECK);
534 break;
535 }
536 case JVM_REF_invokeStatic:
537 case JVM_REF_invokeSpecial: {
538 check_property(
539 tag.is_method() ||
540 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
541 "Invalid constant pool index %u in class file %s (not a method)",
542 ref_index, CHECK);
543 break;
544 }
545 case JVM_REF_invokeInterface: {
546 check_property(
547 tag.is_interface_method(),
548 "Invalid constant pool index %u in class file %s (not an interface method)",
549 ref_index, CHECK);
550 break;
551 }
552 default: {
553 classfile_parse_error(
554 "Bad method handle kind at constant pool index %u in class file %s",
555 index, CHECK);
556 }
557 } // switch(refkind)
558 // Keep the ref_index unchanged. It will be indirected at link-time.
559 break;
560 } // case MethodHandle
561 case JVM_CONSTANT_MethodType: {
562 const int ref_index = cp->method_type_index_at(index);
563 check_property(valid_symbol_at(ref_index),
564 "Invalid constant pool index %u in class file %s",
565 ref_index, CHECK);
566 break;
567 }
568 case JVM_CONSTANT_Dynamic: {
569 const int name_and_type_ref_index =
570 cp->invoke_dynamic_name_and_type_ref_index_at(index);
571
572 check_property(valid_cp_range(name_and_type_ref_index, length) &&
573 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
574 "Invalid constant pool index %u in class file %s",
575 name_and_type_ref_index, CHECK);
576 // bootstrap specifier index must be checked later,
577 // when BootstrapMethods attr is available
578
579 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
580 cp->set_has_dynamic_constant();
581 break;
582 }
583 case JVM_CONSTANT_InvokeDynamic: {
584 const int name_and_type_ref_index =
585 cp->invoke_dynamic_name_and_type_ref_index_at(index);
586
587 check_property(valid_cp_range(name_and_type_ref_index, length) &&
588 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
589 "Invalid constant pool index %u in class file %s",
590 name_and_type_ref_index, CHECK);
591 // bootstrap specifier index must be checked later,
592 // when BootstrapMethods attr is available
593 break;
594 }
595 default: {
596 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
597 ShouldNotReachHere();
598 break;
599 }
600 } // switch(tag)
601 } // end of for
602
603 _first_patched_klass_resolved_index = num_klasses;
604 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
605
606 if (_cp_patches != NULL) {
607 // need to treat this_class specially...
608
609 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
610 // for now. These will be replaced with actual names of the patched classes in patch_class().
611 Symbol* s = vmSymbols::star_name();
612 for (int n=_orig_cp_size; n<cp->length(); n++) {
613 cp->symbol_at_put(n, s);
614 }
615
616 int this_class_index;
617 {
618 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
619 const u1* const mark = stream->current();
620 stream->skip_u2_fast(1); // skip flags
621 this_class_index = stream->get_u2_fast();
622 stream->set_current(mark); // revert to mark
623 }
624
625 for (index = 1; index < length; index++) { // Index 0 is unused
626 if (has_cp_patch_at(index)) {
627 guarantee_property(index != this_class_index,
628 "Illegal constant pool patch to self at %d in class file %s",
629 index, CHECK);
630 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
631 }
632 }
633 }
634
635 if (!_need_verify) {
636 return;
637 }
638
639 // second verification pass - checks the strings are of the right format.
640 // but not yet to the other entries
641 for (index = 1; index < length; index++) {
642 const jbyte tag = cp->tag_at(index).value();
643 switch (tag) {
644 case JVM_CONSTANT_UnresolvedClass: {
645 const Symbol* const class_name = cp->klass_name_at(index);
646 // check the name, even if _cp_patches will overwrite it
647 verify_legal_class_name(class_name, CHECK);
648 break;
649 }
650 case JVM_CONSTANT_NameAndType: {
651 if (_need_verify) {
652 const int sig_index = cp->signature_ref_index_at(index);
653 const int name_index = cp->name_ref_index_at(index);
654 const Symbol* const name = cp->symbol_at(name_index);
655 const Symbol* const sig = cp->symbol_at(sig_index);
656 guarantee_property(sig->utf8_length() != 0,
657 "Illegal zero length constant pool entry at %d in class %s",
658 sig_index, CHECK);
659 guarantee_property(name->utf8_length() != 0,
660 "Illegal zero length constant pool entry at %d in class %s",
661 name_index, CHECK);
662
663 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
664 // Format check method name and signature
665 verify_legal_method_name(name, CHECK);
666 verify_legal_method_signature(name, sig, CHECK);
667 } else {
668 // Format check field name and signature
669 verify_legal_field_name(name, CHECK);
670 verify_legal_field_signature(name, sig, CHECK);
671 }
672 }
673 break;
674 }
675 case JVM_CONSTANT_Dynamic: {
676 const int name_and_type_ref_index =
677 cp->name_and_type_ref_index_at(index);
678 // already verified to be utf8
679 const int name_ref_index =
680 cp->name_ref_index_at(name_and_type_ref_index);
681 // already verified to be utf8
682 const int signature_ref_index =
683 cp->signature_ref_index_at(name_and_type_ref_index);
684 const Symbol* const name = cp->symbol_at(name_ref_index);
685 const Symbol* const signature = cp->symbol_at(signature_ref_index);
686 if (_need_verify) {
687 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
688 // Need only to be sure signature is non-zero length and the right type.
689 if (signature->utf8_length() == 0 ||
690 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
691 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
692 }
693 }
694 break;
695 }
696 case JVM_CONSTANT_InvokeDynamic:
697 case JVM_CONSTANT_Fieldref:
698 case JVM_CONSTANT_Methodref:
699 case JVM_CONSTANT_InterfaceMethodref: {
700 const int name_and_type_ref_index =
701 cp->name_and_type_ref_index_at(index);
702 // already verified to be utf8
703 const int name_ref_index =
704 cp->name_ref_index_at(name_and_type_ref_index);
705 // already verified to be utf8
706 const int signature_ref_index =
707 cp->signature_ref_index_at(name_and_type_ref_index);
708 const Symbol* const name = cp->symbol_at(name_ref_index);
709 const Symbol* const signature = cp->symbol_at(signature_ref_index);
710 if (tag == JVM_CONSTANT_Fieldref) {
711 if (_need_verify) {
712 // Field name and signature are verified above, when iterating NameAndType_info.
713 // Need only to be sure signature is non-zero length and the right type.
714 if (signature->utf8_length() == 0 ||
715 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
716 throwIllegalSignature("Field", name, signature, CHECK);
717 }
718 }
719 } else {
720 if (_need_verify) {
721 // Method name and signature are verified above, when iterating NameAndType_info.
722 // Need only to be sure signature is non-zero length and the right type.
723 if (signature->utf8_length() == 0 ||
724 signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
725 throwIllegalSignature("Method", name, signature, CHECK);
726 }
727 }
728 // 4509014: If a class method name begins with '<', it must be "<init>"
729 const unsigned int name_len = name->utf8_length();
730 if (tag == JVM_CONSTANT_Methodref &&
731 name_len != 0 &&
732 name->byte_at(0) == '<' &&
733 name != vmSymbols::object_initializer_name()) {
734 classfile_parse_error(
735 "Bad method name at constant pool index %u in class file %s",
736 name_ref_index, CHECK);
737 }
738 }
739 break;
740 }
741 case JVM_CONSTANT_MethodHandle: {
742 const int ref_index = cp->method_handle_index_at(index);
743 const int ref_kind = cp->method_handle_ref_kind_at(index);
744 switch (ref_kind) {
745 case JVM_REF_invokeVirtual:
746 case JVM_REF_invokeStatic:
747 case JVM_REF_invokeSpecial:
748 case JVM_REF_newInvokeSpecial: {
749 const int name_and_type_ref_index =
750 cp->name_and_type_ref_index_at(ref_index);
751 const int name_ref_index =
752 cp->name_ref_index_at(name_and_type_ref_index);
753 const Symbol* const name = cp->symbol_at(name_ref_index);
754 if (ref_kind == JVM_REF_newInvokeSpecial) {
755 if (name != vmSymbols::object_initializer_name()) {
756 classfile_parse_error(
757 "Bad constructor name at constant pool index %u in class file %s",
758 name_ref_index, CHECK);
759 }
760 } else {
761 if (name == vmSymbols::object_initializer_name()) {
762 classfile_parse_error(
763 "Bad method name at constant pool index %u in class file %s",
764 name_ref_index, CHECK);
765 }
766 }
767 break;
768 }
769 // Other ref_kinds are already fully checked in previous pass.
770 } // switch(ref_kind)
771 break;
772 }
773 case JVM_CONSTANT_MethodType: {
774 const Symbol* const no_name = vmSymbols::type_name(); // place holder
775 const Symbol* const signature = cp->method_type_signature_at(index);
776 verify_legal_method_signature(no_name, signature, CHECK);
777 break;
778 }
779 case JVM_CONSTANT_Utf8: {
780 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
781 }
782 } // switch(tag)
783 } // end of for
784 }
785
786 Handle ClassFileParser::clear_cp_patch_at(int index) {
787 Handle patch = cp_patch_at(index);
788 _cp_patches->at_put(index, Handle());
789 assert(!has_cp_patch_at(index), "");
790 return patch;
791 }
792
793 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
794 int name_index = _orig_cp_size + _num_patched_klasses;
795 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
796
797 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
798 _num_patched_klasses ++;
799 }
800
801 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
802 int index,
803 Handle patch,
804 TRAPS) {
805 assert(cp != NULL, "invariant");
806
807 BasicType patch_type = T_VOID;
808
809 switch (cp->tag_at(index).value()) {
810
811 case JVM_CONSTANT_UnresolvedClass: {
812 // Patching a class means pre-resolving it.
813 // The name in the constant pool is ignored.
814 if (java_lang_Class::is_instance(patch())) {
815 guarantee_property(!java_lang_Class::is_primitive(patch()),
816 "Illegal class patch at %d in class file %s",
817 index, CHECK);
818 Klass* k = java_lang_Class::as_Klass(patch());
819 patch_class(cp, index, k, k->name());
820 } else {
821 guarantee_property(java_lang_String::is_instance(patch()),
822 "Illegal class patch at %d in class file %s",
823 index, CHECK);
824 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK);
825 patch_class(cp, index, NULL, name);
826 }
827 break;
828 }
829
830 case JVM_CONSTANT_String: {
831 // skip this patch and don't clear it. Needs the oop array for resolved
832 // references to be created first.
833 return;
834 }
835 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
836 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
837 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
838 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
839 patch_prim:
840 {
841 jvalue value;
842 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
843 guarantee_property(value_type == patch_type,
844 "Illegal primitive patch at %d in class file %s",
845 index, CHECK);
846 switch (value_type) {
847 case T_INT: cp->int_at_put(index, value.i); break;
848 case T_FLOAT: cp->float_at_put(index, value.f); break;
849 case T_LONG: cp->long_at_put(index, value.j); break;
850 case T_DOUBLE: cp->double_at_put(index, value.d); break;
851 default: assert(false, "");
852 }
853 } // end patch_prim label
854 break;
855
856 default: {
857 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
858 guarantee_property(!has_cp_patch_at(index),
859 "Illegal unexpected patch at %d in class file %s",
860 index, CHECK);
861 return;
862 }
863 } // end of switch(tag)
864
865 // On fall-through, mark the patch as used.
866 clear_cp_patch_at(index);
867 }
868 class NameSigHash: public ResourceObj {
869 public:
870 const Symbol* _name; // name
871 const Symbol* _sig; // signature
872 NameSigHash* _next; // Next entry in hash table
873 };
874
875 static const int HASH_ROW_SIZE = 256;
876
877 static unsigned int hash(const Symbol* name, const Symbol* sig) {
878 unsigned int raw_hash = 0;
879 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
880 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
881
882 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
883 }
884
885
886 static void initialize_hashtable(NameSigHash** table) {
887 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
888 }
889 // Return false if the name/sig combination is found in table.
890 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
891 // The old format checker uses heap sort to find duplicates.
892 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
893 // of table since we don't expect Symbol*'s to move.
894 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
895 assert(name != NULL, "name in constant pool is NULL");
896
897 // First lookup for duplicates
898 int index = hash(name, sig);
899 NameSigHash* entry = table[index];
900 while (entry != NULL) {
901 if (entry->_name == name && entry->_sig == sig) {
902 return false;
903 }
904 entry = entry->_next;
905 }
906
907 // No duplicate is found, allocate a new entry and fill it.
908 entry = new NameSigHash();
909 entry->_name = name;
910 entry->_sig = sig;
911
912 // Insert into hash table
913 entry->_next = table[index];
914 table[index] = entry;
915
916 return true;
917 }
918
919 // Side-effects: populates the _local_interfaces field
920 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
921 const int itfs_len,
922 ConstantPool* const cp,
923 bool* const has_nonstatic_concrete_methods,
924 TRAPS) {
925 assert(stream != NULL, "invariant");
926 assert(cp != NULL, "invariant");
927 assert(has_nonstatic_concrete_methods != NULL, "invariant");
928
929 if (itfs_len == 0) {
930 _local_interfaces = Universe::the_empty_instance_klass_array();
931 } else {
932 assert(itfs_len > 0, "only called for len>0");
933 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
934
935 int index;
936 for (index = 0; index < itfs_len; index++) {
937 const u2 interface_index = stream->get_u2(CHECK);
938 Klass* interf;
939 check_property(
940 valid_klass_reference_at(interface_index),
941 "Interface name has bad constant pool index %u in class file %s",
942 interface_index, CHECK);
943 if (cp->tag_at(interface_index).is_klass()) {
944 interf = cp->resolved_klass_at(interface_index);
945 } else {
946 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
947
948 // Don't need to check legal name because it's checked when parsing constant pool.
949 // But need to make sure it's not an array type.
950 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
951 "Bad interface name in class file %s", CHECK);
952
953 // Call resolve_super so classcircularity is checked
954 interf = SystemDictionary::resolve_super_or_fail(
955 _class_name,
956 unresolved_klass,
957 Handle(THREAD, _loader_data->class_loader()),
958 _protection_domain,
959 false,
960 CHECK);
961 }
962
963 if (!interf->is_interface()) {
964 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
965 err_msg("class %s can not implement %s, because it is not an interface (%s)",
966 _class_name->as_klass_external_name(),
967 interf->external_name(),
968 interf->class_in_module_of_loader()));
969 }
970
971 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
972 *has_nonstatic_concrete_methods = true;
973 }
974 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
975 }
976
977 if (!_need_verify || itfs_len <= 1) {
978 return;
979 }
980
981 // Check if there's any duplicates in interfaces
982 ResourceMark rm(THREAD);
983 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
984 NameSigHash*,
985 HASH_ROW_SIZE);
986 initialize_hashtable(interface_names);
987 bool dup = false;
988 const Symbol* name = NULL;
989 {
990 debug_only(NoSafepointVerifier nsv;)
991 for (index = 0; index < itfs_len; index++) {
992 const InstanceKlass* const k = _local_interfaces->at(index);
993 name = k->name();
994 // If no duplicates, add (name, NULL) in hashtable interface_names.
995 if (!put_after_lookup(name, NULL, interface_names)) {
996 dup = true;
997 break;
998 }
999 }
1000 }
1001 if (dup) {
1002 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
1003 name->as_C_string(), CHECK);
1004 }
1005 }
1006 }
1007
1008 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
1009 int constantvalue_index,
1010 int signature_index,
1011 TRAPS) const {
1012 // Make sure the constant pool entry is of a type appropriate to this field
1013 guarantee_property(
1014 (constantvalue_index > 0 &&
1015 constantvalue_index < cp->length()),
1016 "Bad initial value index %u in ConstantValue attribute in class file %s",
1017 constantvalue_index, CHECK);
1018
1019 const constantTag value_type = cp->tag_at(constantvalue_index);
1020 switch(cp->basic_type_for_signature_at(signature_index)) {
1021 case T_LONG: {
1022 guarantee_property(value_type.is_long(),
1023 "Inconsistent constant value type in class file %s",
1024 CHECK);
1025 break;
1026 }
1027 case T_FLOAT: {
1028 guarantee_property(value_type.is_float(),
1029 "Inconsistent constant value type in class file %s",
1030 CHECK);
1031 break;
1032 }
1033 case T_DOUBLE: {
1034 guarantee_property(value_type.is_double(),
1035 "Inconsistent constant value type in class file %s",
1036 CHECK);
1037 break;
1038 }
1039 case T_BYTE:
1040 case T_CHAR:
1041 case T_SHORT:
1042 case T_BOOLEAN:
1043 case T_INT: {
1044 guarantee_property(value_type.is_int(),
1045 "Inconsistent constant value type in class file %s",
1046 CHECK);
1047 break;
1048 }
1049 case T_OBJECT: {
1050 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1051 && value_type.is_string()),
1052 "Bad string initial value in class file %s",
1053 CHECK);
1054 break;
1055 }
1056 default: {
1057 classfile_parse_error("Unable to set initial value %u in class file %s",
1058 constantvalue_index,
1059 CHECK);
1060 }
1061 }
1062 }
1063
1064 class AnnotationCollector : public ResourceObj{
1065 public:
1066 enum Location { _in_field, _in_method, _in_class };
1067 enum ID {
1068 _unknown = 0,
1069 _method_CallerSensitive,
1070 _method_ForceInline,
1071 _method_DontInline,
1072 _method_InjectedProfile,
1073 _method_LambdaForm_Compiled,
1074 _method_LambdaForm_Hidden,
1075 _method_HotSpotIntrinsicCandidate,
1076 _jdk_internal_vm_annotation_Contended,
1077 _field_Stable,
1078 _jdk_internal_vm_annotation_ReservedStackAccess,
1079 _annotation_LIMIT
1080 };
1081 const Location _location;
1082 int _annotations_present;
1083 u2 _contended_group;
1084
1085 AnnotationCollector(Location location)
1086 : _location(location), _annotations_present(0)
1087 {
1088 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1089 }
1090 // If this annotation name has an ID, report it (or _none).
1091 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1092 // Set the annotation name:
1093 void set_annotation(ID id) {
1094 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1095 _annotations_present |= nth_bit((int)id);
1096 }
1097
1098 void remove_annotation(ID id) {
1099 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1100 _annotations_present &= ~nth_bit((int)id);
1101 }
1102
1103 // Report if the annotation is present.
1104 bool has_any_annotations() const { return _annotations_present != 0; }
1105 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1106
1107 void set_contended_group(u2 group) { _contended_group = group; }
1108 u2 contended_group() const { return _contended_group; }
1109
1110 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1111
1112 void set_stable(bool stable) { set_annotation(_field_Stable); }
1113 bool is_stable() const { return has_annotation(_field_Stable); }
1114 };
1115
1116 // This class also doubles as a holder for metadata cleanup.
1117 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1118 private:
1119 ClassLoaderData* _loader_data;
1120 AnnotationArray* _field_annotations;
1121 AnnotationArray* _field_type_annotations;
1122 public:
1123 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1124 AnnotationCollector(_in_field),
1125 _loader_data(loader_data),
1126 _field_annotations(NULL),
1127 _field_type_annotations(NULL) {}
1128 ~FieldAnnotationCollector();
1129 void apply_to(FieldInfo* f);
1130 AnnotationArray* field_annotations() { return _field_annotations; }
1131 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1132
1133 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1134 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1135 };
1136
1137 class MethodAnnotationCollector : public AnnotationCollector{
1138 public:
1139 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1140 void apply_to(const methodHandle& m);
1141 };
1142
1143 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1144 public:
1145 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1146 void apply_to(InstanceKlass* ik);
1147 };
1148
1149
1150 static int skip_annotation_value(const u1*, int, int); // fwd decl
1151
1152 // Safely increment index by val if does not pass limit
1153 #define SAFE_ADD(index, limit, val) \
1154 if (index >= limit - val) return limit; \
1155 index += val;
1156
1157 // Skip an annotation. Return >=limit if there is any problem.
1158 static int skip_annotation(const u1* buffer, int limit, int index) {
1159 assert(buffer != NULL, "invariant");
1160 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1161 // value := switch (tag:u1) { ... }
1162 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1163 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1164 while (--nmem >= 0 && index < limit) {
1165 SAFE_ADD(index, limit, 2); // skip member
1166 index = skip_annotation_value(buffer, limit, index);
1167 }
1168 return index;
1169 }
1170
1171 // Skip an annotation value. Return >=limit if there is any problem.
1172 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1173 assert(buffer != NULL, "invariant");
1174
1175 // value := switch (tag:u1) {
1176 // case B, C, I, S, Z, D, F, J, c: con:u2;
1177 // case e: e_class:u2 e_name:u2;
1178 // case s: s_con:u2;
1179 // case [: do(nval:u2) {value};
1180 // case @: annotation;
1181 // case s: s_con:u2;
1182 // }
1183 SAFE_ADD(index, limit, 1); // read tag
1184 const u1 tag = buffer[index - 1];
1185 switch (tag) {
1186 case 'B':
1187 case 'C':
1188 case 'I':
1189 case 'S':
1190 case 'Z':
1191 case 'D':
1192 case 'F':
1193 case 'J':
1194 case 'c':
1195 case 's':
1196 SAFE_ADD(index, limit, 2); // skip con or s_con
1197 break;
1198 case 'e':
1199 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1200 break;
1201 case '[':
1202 {
1203 SAFE_ADD(index, limit, 2); // read nval
1204 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1205 while (--nval >= 0 && index < limit) {
1206 index = skip_annotation_value(buffer, limit, index);
1207 }
1208 }
1209 break;
1210 case '@':
1211 index = skip_annotation(buffer, limit, index);
1212 break;
1213 default:
1214 return limit; // bad tag byte
1215 }
1216 return index;
1217 }
1218
1219 // Sift through annotations, looking for those significant to the VM:
1220 static void parse_annotations(const ConstantPool* const cp,
1221 const u1* buffer, int limit,
1222 AnnotationCollector* coll,
1223 ClassLoaderData* loader_data,
1224 TRAPS) {
1225
1226 assert(cp != NULL, "invariant");
1227 assert(buffer != NULL, "invariant");
1228 assert(coll != NULL, "invariant");
1229 assert(loader_data != NULL, "invariant");
1230
1231 // annotations := do(nann:u2) {annotation}
1232 int index = 2; // read nann
1233 if (index >= limit) return;
1234 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1235 enum { // initial annotation layout
1236 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1237 count_off = 2, // u2 such as 1 (one value)
1238 member_off = 4, // utf8 such as 'value'
1239 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1240 e_tag_val = 'e',
1241 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1242 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1243 e_size = 11, // end of 'e' annotation
1244 c_tag_val = 'c', // payload is type
1245 c_con_off = 7, // utf8 payload, such as 'I'
1246 c_size = 9, // end of 'c' annotation
1247 s_tag_val = 's', // payload is String
1248 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1249 s_size = 9,
1250 min_size = 6 // smallest possible size (zero members)
1251 };
1252 // Cannot add min_size to index in case of overflow MAX_INT
1253 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1254 int index0 = index;
1255 index = skip_annotation(buffer, limit, index);
1256 const u1* const abase = buffer + index0;
1257 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1258 const int count = Bytes::get_Java_u2((address)abase + count_off);
1259 const Symbol* const aname = check_symbol_at(cp, atype);
1260 if (aname == NULL) break; // invalid annotation name
1261 const Symbol* member = NULL;
1262 if (count >= 1) {
1263 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1264 member = check_symbol_at(cp, member_index);
1265 if (member == NULL) break; // invalid member name
1266 }
1267
1268 // Here is where parsing particular annotations will take place.
1269 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1270 if (AnnotationCollector::_unknown == id) continue;
1271 coll->set_annotation(id);
1272
1273 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1274 // @Contended can optionally specify the contention group.
1275 //
1276 // Contended group defines the equivalence class over the fields:
1277 // the fields within the same contended group are not treated distinct.
1278 // The only exception is default group, which does not incur the
1279 // equivalence. Naturally, contention group for classes is meaningless.
1280 //
1281 // While the contention group is specified as String, annotation
1282 // values are already interned, and we might as well use the constant
1283 // pool index as the group tag.
1284 //
1285 u2 group_index = 0; // default contended group
1286 if (count == 1
1287 && s_size == (index - index0) // match size
1288 && s_tag_val == *(abase + tag_off)
1289 && member == vmSymbols::value_name()) {
1290 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1291 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1292 group_index = 0; // default contended group
1293 }
1294 }
1295 coll->set_contended_group(group_index);
1296 }
1297 }
1298 }
1299
1300
1301 // Parse attributes for a field.
1302 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1303 u2 attributes_count,
1304 bool is_static, u2 signature_index,
1305 u2* const constantvalue_index_addr,
1306 bool* const is_synthetic_addr,
1307 u2* const generic_signature_index_addr,
1308 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1309 TRAPS) {
1310 assert(cfs != NULL, "invariant");
1311 assert(constantvalue_index_addr != NULL, "invariant");
1312 assert(is_synthetic_addr != NULL, "invariant");
1313 assert(generic_signature_index_addr != NULL, "invariant");
1314 assert(parsed_annotations != NULL, "invariant");
1315 assert(attributes_count > 0, "attributes_count should be greater than 0");
1316
1317 u2 constantvalue_index = 0;
1318 u2 generic_signature_index = 0;
1319 bool is_synthetic = false;
1320 const u1* runtime_visible_annotations = NULL;
1321 int runtime_visible_annotations_length = 0;
1322 const u1* runtime_invisible_annotations = NULL;
1323 int runtime_invisible_annotations_length = 0;
1324 const u1* runtime_visible_type_annotations = NULL;
1325 int runtime_visible_type_annotations_length = 0;
1326 const u1* runtime_invisible_type_annotations = NULL;
1327 int runtime_invisible_type_annotations_length = 0;
1328 bool runtime_invisible_annotations_exists = false;
1329 bool runtime_invisible_type_annotations_exists = false;
1330 const ConstantPool* const cp = _cp;
1331
1332 while (attributes_count--) {
1333 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1334 const u2 attribute_name_index = cfs->get_u2_fast();
1335 const u4 attribute_length = cfs->get_u4_fast();
1336 check_property(valid_symbol_at(attribute_name_index),
1337 "Invalid field attribute index %u in class file %s",
1338 attribute_name_index,
1339 CHECK);
1340
1341 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1342 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1343 // ignore if non-static
1344 if (constantvalue_index != 0) {
1345 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1346 }
1347 check_property(
1348 attribute_length == 2,
1349 "Invalid ConstantValue field attribute length %u in class file %s",
1350 attribute_length, CHECK);
1351
1352 constantvalue_index = cfs->get_u2(CHECK);
1353 if (_need_verify) {
1354 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1355 }
1356 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1357 if (attribute_length != 0) {
1358 classfile_parse_error(
1359 "Invalid Synthetic field attribute length %u in class file %s",
1360 attribute_length, CHECK);
1361 }
1362 is_synthetic = true;
1363 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1364 if (attribute_length != 0) {
1365 classfile_parse_error(
1366 "Invalid Deprecated field attribute length %u in class file %s",
1367 attribute_length, CHECK);
1368 }
1369 } else if (_major_version >= JAVA_1_5_VERSION) {
1370 if (attribute_name == vmSymbols::tag_signature()) {
1371 if (generic_signature_index != 0) {
1372 classfile_parse_error(
1373 "Multiple Signature attributes for field in class file %s", CHECK);
1374 }
1375 if (attribute_length != 2) {
1376 classfile_parse_error(
1377 "Wrong size %u for field's Signature attribute in class file %s",
1378 attribute_length, CHECK);
1379 }
1380 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1381 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1382 if (runtime_visible_annotations != NULL) {
1383 classfile_parse_error(
1384 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1385 }
1386 runtime_visible_annotations_length = attribute_length;
1387 runtime_visible_annotations = cfs->current();
1388 assert(runtime_visible_annotations != NULL, "null visible annotations");
1389 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1390 parse_annotations(cp,
1391 runtime_visible_annotations,
1392 runtime_visible_annotations_length,
1393 parsed_annotations,
1394 _loader_data,
1395 CHECK);
1396 cfs->skip_u1_fast(runtime_visible_annotations_length);
1397 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1398 if (runtime_invisible_annotations_exists) {
1399 classfile_parse_error(
1400 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1401 }
1402 runtime_invisible_annotations_exists = true;
1403 if (PreserveAllAnnotations) {
1404 runtime_invisible_annotations_length = attribute_length;
1405 runtime_invisible_annotations = cfs->current();
1406 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1407 }
1408 cfs->skip_u1(attribute_length, CHECK);
1409 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1410 if (runtime_visible_type_annotations != NULL) {
1411 classfile_parse_error(
1412 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1413 }
1414 runtime_visible_type_annotations_length = attribute_length;
1415 runtime_visible_type_annotations = cfs->current();
1416 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1417 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1418 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1419 if (runtime_invisible_type_annotations_exists) {
1420 classfile_parse_error(
1421 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1422 } else {
1423 runtime_invisible_type_annotations_exists = true;
1424 }
1425 if (PreserveAllAnnotations) {
1426 runtime_invisible_type_annotations_length = attribute_length;
1427 runtime_invisible_type_annotations = cfs->current();
1428 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1429 }
1430 cfs->skip_u1(attribute_length, CHECK);
1431 } else {
1432 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1433 }
1434 } else {
1435 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1436 }
1437 }
1438
1439 *constantvalue_index_addr = constantvalue_index;
1440 *is_synthetic_addr = is_synthetic;
1441 *generic_signature_index_addr = generic_signature_index;
1442 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1443 runtime_visible_annotations_length,
1444 runtime_invisible_annotations,
1445 runtime_invisible_annotations_length,
1446 CHECK);
1447 parsed_annotations->set_field_annotations(a);
1448 a = assemble_annotations(runtime_visible_type_annotations,
1449 runtime_visible_type_annotations_length,
1450 runtime_invisible_type_annotations,
1451 runtime_invisible_type_annotations_length,
1452 CHECK);
1453 parsed_annotations->set_field_type_annotations(a);
1454 return;
1455 }
1456
1457
1458 // Field allocation types. Used for computing field offsets.
1459
1460 enum FieldAllocationType {
1461 STATIC_OOP, // Oops
1462 STATIC_BYTE, // Boolean, Byte, char
1463 STATIC_SHORT, // shorts
1464 STATIC_WORD, // ints
1465 STATIC_DOUBLE, // aligned long or double
1466 STATIC_FLATTENABLE, // flattenable field
1467 NONSTATIC_OOP,
1468 NONSTATIC_BYTE,
1469 NONSTATIC_SHORT,
1470 NONSTATIC_WORD,
1471 NONSTATIC_DOUBLE,
1472 NONSTATIC_FLATTENABLE,
1473 MAX_FIELD_ALLOCATION_TYPE,
1474 BAD_ALLOCATION_TYPE = -1
1475 };
1476
1477 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1478 BAD_ALLOCATION_TYPE, // 0
1479 BAD_ALLOCATION_TYPE, // 1
1480 BAD_ALLOCATION_TYPE, // 2
1481 BAD_ALLOCATION_TYPE, // 3
1482 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1483 NONSTATIC_SHORT, // T_CHAR = 5,
1484 NONSTATIC_WORD, // T_FLOAT = 6,
1485 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1486 NONSTATIC_BYTE, // T_BYTE = 8,
1487 NONSTATIC_SHORT, // T_SHORT = 9,
1488 NONSTATIC_WORD, // T_INT = 10,
1489 NONSTATIC_DOUBLE, // T_LONG = 11,
1490 NONSTATIC_OOP, // T_OBJECT = 12,
1491 NONSTATIC_OOP, // T_ARRAY = 13,
1492 NONSTATIC_OOP, // T_VALUETYPE = 14,
1493 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1494 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1495 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1496 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1497 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1498 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20,
1499 BAD_ALLOCATION_TYPE, // 0
1500 BAD_ALLOCATION_TYPE, // 1
1501 BAD_ALLOCATION_TYPE, // 2
1502 BAD_ALLOCATION_TYPE, // 3
1503 STATIC_BYTE , // T_BOOLEAN = 4,
1504 STATIC_SHORT, // T_CHAR = 5,
1505 STATIC_WORD, // T_FLOAT = 6,
1506 STATIC_DOUBLE, // T_DOUBLE = 7,
1507 STATIC_BYTE, // T_BYTE = 8,
1508 STATIC_SHORT, // T_SHORT = 9,
1509 STATIC_WORD, // T_INT = 10,
1510 STATIC_DOUBLE, // T_LONG = 11,
1511 STATIC_OOP, // T_OBJECT = 12,
1512 STATIC_OOP, // T_ARRAY = 13,
1513 STATIC_OOP, // T_VALUETYPE = 14,
1514 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1515 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1516 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1517 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1518 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1519 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20
1520 };
1521
1522 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type, bool is_flattenable) {
1523 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1524 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1525 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1526 if (is_flattenable) {
1527 result = is_static ? STATIC_FLATTENABLE : NONSTATIC_FLATTENABLE;
1528 }
1529 return result;
1530 }
1531
1532 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1533 public:
1534 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1535
1536 FieldAllocationCount() {
1537 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1538 count[i] = 0;
1539 }
1540 }
1541
1542 FieldAllocationType update(bool is_static, BasicType type, bool is_flattenable) {
1543 FieldAllocationType atype = basic_type_to_atype(is_static, type, is_flattenable);
1544 if (atype != BAD_ALLOCATION_TYPE) {
1545 // Make sure there is no overflow with injected fields.
1546 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1547 count[atype]++;
1548 }
1549 return atype;
1550 }
1551 };
1552
1553 // Side-effects: populates the _fields, _fields_annotations,
1554 // _fields_type_annotations fields
1555 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1556 bool is_interface,
1557 bool is_value_type,
1558 FieldAllocationCount* const fac,
1559 ConstantPool* cp,
1560 const int cp_size,
1561 u2* const java_fields_count_ptr,
1562 TRAPS) {
1563
1564 assert(cfs != NULL, "invariant");
1565 assert(fac != NULL, "invariant");
1566 assert(cp != NULL, "invariant");
1567 assert(java_fields_count_ptr != NULL, "invariant");
1568
1569 assert(NULL == _fields, "invariant");
1570 assert(NULL == _fields_annotations, "invariant");
1571 assert(NULL == _fields_type_annotations, "invariant");
1572
1573 cfs->guarantee_more(2, CHECK); // length
1574 const u2 length = cfs->get_u2_fast();
1575 *java_fields_count_ptr = length;
1576
1577 int num_injected = 0;
1578 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1579 &num_injected);
1580
1581 const int total_fields = length + num_injected + (is_value_type ? 1 : 0);
1582
1583 // The field array starts with tuples of shorts
1584 // [access, name index, sig index, initial value index, byte offset].
1585 // A generic signature slot only exists for field with generic
1586 // signature attribute. And the access flag is set with
1587 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1588 // signature slots are at the end of the field array and after all
1589 // other fields data.
1590 //
1591 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1592 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1593 // ...
1594 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1595 // [generic signature index]
1596 // [generic signature index]
1597 // ...
1598 //
1599 // Allocate a temporary resource array for field data. For each field,
1600 // a slot is reserved in the temporary array for the generic signature
1601 // index. After parsing all fields, the data are copied to a permanent
1602 // array and any unused slots will be discarded.
1603 ResourceMark rm(THREAD);
1604 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1605 u2,
1606 total_fields * (FieldInfo::field_slots + 1));
1607
1608 // The generic signature slots start after all other fields' data.
1609 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1610 int num_generic_signature = 0;
1611 for (int n = 0; n < length; n++) {
1612 // access_flags, name_index, descriptor_index, attributes_count
1613 cfs->guarantee_more(8, CHECK);
1614
1615 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1616 // JVM_ACC_FLATTENABLE is defined for class file version 55 and later
1617 if (supports_value_types()) {
1618 recognized_modifiers |= JVM_ACC_FLATTENABLE;
1619 }
1620
1621 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1622 verify_legal_field_modifiers(flags, is_interface, is_value_type, CHECK);
1623 AccessFlags access_flags;
1624 access_flags.set_flags(flags);
1625
1626 const u2 name_index = cfs->get_u2_fast();
1627 check_property(valid_symbol_at(name_index),
1628 "Invalid constant pool index %u for field name in class file %s",
1629 name_index, CHECK);
1630 const Symbol* const name = cp->symbol_at(name_index);
1631 verify_legal_field_name(name, CHECK);
1632
1633 const u2 signature_index = cfs->get_u2_fast();
1634 check_property(valid_symbol_at(signature_index),
1635 "Invalid constant pool index %u for field signature in class file %s",
1636 signature_index, CHECK);
1637 const Symbol* const sig = cp->symbol_at(signature_index);
1638 verify_legal_field_signature(name, sig, CHECK);
1639 if (access_flags.is_flattenable()) {
1640 // Array flattenability cannot be specified. Arrays of value classes are
1641 // are always flattenable. Arrays of other classes are not flattenable.
1642 if (sig->utf8_length() > 1 && sig->byte_at(0) == '[') {
1643 classfile_parse_error(
1644 "Field \"%s\" with signature \"%s\" in class file %s is invalid."
1645 " ACC_FLATTENABLE cannot be specified for an array",
1646 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1647 }
1648 _has_flattenable_fields = true;
1649 }
1650
1651 u2 constantvalue_index = 0;
1652 bool is_synthetic = false;
1653 u2 generic_signature_index = 0;
1654 const bool is_static = access_flags.is_static();
1655 FieldAnnotationCollector parsed_annotations(_loader_data);
1656
1657 const u2 attributes_count = cfs->get_u2_fast();
1658 if (attributes_count > 0) {
1659 parse_field_attributes(cfs,
1660 attributes_count,
1661 is_static,
1662 signature_index,
1663 &constantvalue_index,
1664 &is_synthetic,
1665 &generic_signature_index,
1666 &parsed_annotations,
1667 CHECK);
1668
1669 if (parsed_annotations.field_annotations() != NULL) {
1670 if (_fields_annotations == NULL) {
1671 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1672 _loader_data, length, NULL,
1673 CHECK);
1674 }
1675 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1676 parsed_annotations.set_field_annotations(NULL);
1677 }
1678 if (parsed_annotations.field_type_annotations() != NULL) {
1679 if (_fields_type_annotations == NULL) {
1680 _fields_type_annotations =
1681 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1682 length,
1683 NULL,
1684 CHECK);
1685 }
1686 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1687 parsed_annotations.set_field_type_annotations(NULL);
1688 }
1689
1690 if (is_synthetic) {
1691 access_flags.set_is_synthetic();
1692 }
1693 if (generic_signature_index != 0) {
1694 access_flags.set_field_has_generic_signature();
1695 fa[generic_signature_slot] = generic_signature_index;
1696 generic_signature_slot ++;
1697 num_generic_signature ++;
1698 }
1699 }
1700
1701 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1702 field->initialize(access_flags.as_short(),
1703 name_index,
1704 signature_index,
1705 constantvalue_index);
1706 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1707
1708 // Remember how many oops we encountered and compute allocation type
1709 const FieldAllocationType atype = fac->update(is_static, type, access_flags.is_flattenable());
1710 field->set_allocation_type(atype);
1711
1712 // After field is initialized with type, we can augment it with aux info
1713 if (parsed_annotations.has_any_annotations())
1714 parsed_annotations.apply_to(field);
1715 }
1716
1717 int index = length;
1718 if (num_injected != 0) {
1719 for (int n = 0; n < num_injected; n++) {
1720 // Check for duplicates
1721 if (injected[n].may_be_java) {
1722 const Symbol* const name = injected[n].name();
1723 const Symbol* const signature = injected[n].signature();
1724 bool duplicate = false;
1725 for (int i = 0; i < length; i++) {
1726 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1727 if (name == cp->symbol_at(f->name_index()) &&
1728 signature == cp->symbol_at(f->signature_index())) {
1729 // Symbol is desclared in Java so skip this one
1730 duplicate = true;
1731 break;
1732 }
1733 }
1734 if (duplicate) {
1735 // These will be removed from the field array at the end
1736 continue;
1737 }
1738 }
1739
1740 // Injected field
1741 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1742 field->initialize(JVM_ACC_FIELD_INTERNAL,
1743 injected[n].name_index,
1744 injected[n].signature_index,
1745 0);
1746
1747 const BasicType type = FieldType::basic_type(injected[n].signature());
1748
1749 // Remember how many oops we encountered and compute allocation type
1750 const FieldAllocationType atype = fac->update(false, type, false);
1751 field->set_allocation_type(atype);
1752 index++;
1753 }
1754 }
1755
1756 if (is_value_type) {
1757 index = length + num_injected;
1758 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1759 field->initialize(JVM_ACC_FIELD_INTERNAL | JVM_ACC_STATIC,
1760 vmSymbols::default_value_name_enum,
1761 vmSymbols::java_lang_Object_enum,
1762 0);
1763 const BasicType type = FieldType::basic_type(vmSymbols::object_signature());
1764 const FieldAllocationType atype = fac->update(true, type, false);
1765 field->set_allocation_type(atype);
1766 index++;
1767 }
1768
1769 assert(NULL == _fields, "invariant");
1770
1771 _fields =
1772 MetadataFactory::new_array<u2>(_loader_data,
1773 index * FieldInfo::field_slots + num_generic_signature,
1774 CHECK);
1775 // Sometimes injected fields already exist in the Java source so
1776 // the fields array could be too long. In that case the
1777 // fields array is trimed. Also unused slots that were reserved
1778 // for generic signature indexes are discarded.
1779 {
1780 int i = 0;
1781 for (; i < index * FieldInfo::field_slots; i++) {
1782 _fields->at_put(i, fa[i]);
1783 }
1784 for (int j = total_fields * FieldInfo::field_slots;
1785 j < generic_signature_slot; j++) {
1786 _fields->at_put(i++, fa[j]);
1787 }
1788 assert(_fields->length() == i, "");
1789 }
1790
1791 if (_need_verify && length > 1) {
1792 // Check duplicated fields
1793 ResourceMark rm(THREAD);
1794 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1795 THREAD, NameSigHash*, HASH_ROW_SIZE);
1796 initialize_hashtable(names_and_sigs);
1797 bool dup = false;
1798 const Symbol* name = NULL;
1799 const Symbol* sig = NULL;
1800 {
1801 debug_only(NoSafepointVerifier nsv;)
1802 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1803 name = fs.name();
1804 sig = fs.signature();
1805 // If no duplicates, add name/signature in hashtable names_and_sigs.
1806 if (!put_after_lookup(name, sig, names_and_sigs)) {
1807 dup = true;
1808 break;
1809 }
1810 }
1811 }
1812 if (dup) {
1813 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1814 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1815 }
1816 }
1817 }
1818
1819
1820 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1821 u4 code_length,
1822 u4 exception_table_length,
1823 TRAPS) {
1824 assert(cfs != NULL, "invariant");
1825
1826 const unsafe_u2* const exception_table_start = cfs->current();
1827 assert(exception_table_start != NULL, "null exception table");
1828
1829 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1830 // end_pc,
1831 // handler_pc,
1832 // catch_type_index
1833
1834 // Will check legal target after parsing code array in verifier.
1835 if (_need_verify) {
1836 for (unsigned int i = 0; i < exception_table_length; i++) {
1837 const u2 start_pc = cfs->get_u2_fast();
1838 const u2 end_pc = cfs->get_u2_fast();
1839 const u2 handler_pc = cfs->get_u2_fast();
1840 const u2 catch_type_index = cfs->get_u2_fast();
1841 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1842 "Illegal exception table range in class file %s",
1843 CHECK_NULL);
1844 guarantee_property(handler_pc < code_length,
1845 "Illegal exception table handler in class file %s",
1846 CHECK_NULL);
1847 if (catch_type_index != 0) {
1848 guarantee_property(valid_klass_reference_at(catch_type_index),
1849 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1850 }
1851 }
1852 } else {
1853 cfs->skip_u2_fast(exception_table_length * 4);
1854 }
1855 return exception_table_start;
1856 }
1857
1858 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1859 u4 code_length,
1860 CompressedLineNumberWriteStream**const write_stream,
1861 TRAPS) {
1862
1863 const ClassFileStream* const cfs = _stream;
1864 unsigned int num_entries = cfs->get_u2(CHECK);
1865
1866 // Each entry is a u2 start_pc, and a u2 line_number
1867 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1868
1869 // Verify line number attribute and table length
1870 check_property(
1871 code_attribute_length == sizeof(u2) + length_in_bytes,
1872 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1873
1874 cfs->guarantee_more(length_in_bytes, CHECK);
1875
1876 if ((*write_stream) == NULL) {
1877 if (length_in_bytes > fixed_buffer_size) {
1878 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1879 } else {
1880 (*write_stream) = new CompressedLineNumberWriteStream(
1881 _linenumbertable_buffer, fixed_buffer_size);
1882 }
1883 }
1884
1885 while (num_entries-- > 0) {
1886 const u2 bci = cfs->get_u2_fast(); // start_pc
1887 const u2 line = cfs->get_u2_fast(); // line_number
1888 guarantee_property(bci < code_length,
1889 "Invalid pc in LineNumberTable in class file %s", CHECK);
1890 (*write_stream)->write_pair(bci, line);
1891 }
1892 }
1893
1894
1895 class LVT_Hash : public AllStatic {
1896 public:
1897
1898 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1899 /*
1900 * 3-tuple start_bci/length/slot has to be unique key,
1901 * so the following comparison seems to be redundant:
1902 * && elem->name_cp_index == entry->_elem->name_cp_index
1903 */
1904 return (e0.start_bci == e1.start_bci &&
1905 e0.length == e1.length &&
1906 e0.name_cp_index == e1.name_cp_index &&
1907 e0.slot == e1.slot);
1908 }
1909
1910 static unsigned int hash(LocalVariableTableElement const& e0) {
1911 unsigned int raw_hash = e0.start_bci;
1912
1913 raw_hash = e0.length + raw_hash * 37;
1914 raw_hash = e0.name_cp_index + raw_hash * 37;
1915 raw_hash = e0.slot + raw_hash * 37;
1916
1917 return raw_hash;
1918 }
1919 };
1920
1921
1922 // Class file LocalVariableTable elements.
1923 class Classfile_LVT_Element {
1924 public:
1925 u2 start_bci;
1926 u2 length;
1927 u2 name_cp_index;
1928 u2 descriptor_cp_index;
1929 u2 slot;
1930 };
1931
1932 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1933 LocalVariableTableElement* const lvt) {
1934 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1935 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1936 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1937 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1938 lvt->signature_cp_index = 0;
1939 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1940 }
1941
1942 // Function is used to parse both attributes:
1943 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1944 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1945 u4 code_length,
1946 u2 max_locals,
1947 u4 code_attribute_length,
1948 u2* const localvariable_table_length,
1949 bool isLVTT,
1950 TRAPS) {
1951 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1952 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1953 const unsigned int size =
1954 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1955
1956 const ConstantPool* const cp = _cp;
1957
1958 // Verify local variable table attribute has right length
1959 if (_need_verify) {
1960 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1961 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1962 }
1963
1964 const unsafe_u2* const localvariable_table_start = cfs->current();
1965 assert(localvariable_table_start != NULL, "null local variable table");
1966 if (!_need_verify) {
1967 cfs->skip_u2_fast(size);
1968 } else {
1969 cfs->guarantee_more(size * 2, CHECK_NULL);
1970 for(int i = 0; i < (*localvariable_table_length); i++) {
1971 const u2 start_pc = cfs->get_u2_fast();
1972 const u2 length = cfs->get_u2_fast();
1973 const u2 name_index = cfs->get_u2_fast();
1974 const u2 descriptor_index = cfs->get_u2_fast();
1975 const u2 index = cfs->get_u2_fast();
1976 // Assign to a u4 to avoid overflow
1977 const u4 end_pc = (u4)start_pc + (u4)length;
1978
1979 if (start_pc >= code_length) {
1980 classfile_parse_error(
1981 "Invalid start_pc %u in %s in class file %s",
1982 start_pc, tbl_name, CHECK_NULL);
1983 }
1984 if (end_pc > code_length) {
1985 classfile_parse_error(
1986 "Invalid length %u in %s in class file %s",
1987 length, tbl_name, CHECK_NULL);
1988 }
1989 const int cp_size = cp->length();
1990 guarantee_property(valid_symbol_at(name_index),
1991 "Name index %u in %s has bad constant type in class file %s",
1992 name_index, tbl_name, CHECK_NULL);
1993 guarantee_property(valid_symbol_at(descriptor_index),
1994 "Signature index %u in %s has bad constant type in class file %s",
1995 descriptor_index, tbl_name, CHECK_NULL);
1996
1997 const Symbol* const name = cp->symbol_at(name_index);
1998 const Symbol* const sig = cp->symbol_at(descriptor_index);
1999 verify_legal_field_name(name, CHECK_NULL);
2000 u2 extra_slot = 0;
2001 if (!isLVTT) {
2002 verify_legal_field_signature(name, sig, CHECK_NULL);
2003
2004 // 4894874: check special cases for double and long local variables
2005 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
2006 sig == vmSymbols::type_signature(T_LONG)) {
2007 extra_slot = 1;
2008 }
2009 }
2010 guarantee_property((index + extra_slot) < max_locals,
2011 "Invalid index %u in %s in class file %s",
2012 index, tbl_name, CHECK_NULL);
2013 }
2014 }
2015 return localvariable_table_start;
2016 }
2017
2018
2019 void ClassFileParser::parse_type_array(u2 array_length,
2020 u4 code_length,
2021 u4* const u1_index,
2022 u4* const u2_index,
2023 u1* const u1_array,
2024 u2* const u2_array,
2025 TRAPS) {
2026 const ClassFileStream* const cfs = _stream;
2027 u2 index = 0; // index in the array with long/double occupying two slots
2028 u4 i1 = *u1_index;
2029 u4 i2 = *u2_index + 1;
2030 for(int i = 0; i < array_length; i++) {
2031 const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
2032 index++;
2033 if (tag == ITEM_Long || tag == ITEM_Double) {
2034 index++;
2035 } else if (tag == ITEM_Object) {
2036 const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
2037 guarantee_property(valid_klass_reference_at(class_index),
2038 "Bad class index %u in StackMap in class file %s",
2039 class_index, CHECK);
2040 } else if (tag == ITEM_Uninitialized) {
2041 const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
2042 guarantee_property(
2043 offset < code_length,
2044 "Bad uninitialized type offset %u in StackMap in class file %s",
2045 offset, CHECK);
2046 } else {
2047 guarantee_property(
2048 tag <= (u1)ITEM_Uninitialized,
2049 "Unknown variable type %u in StackMap in class file %s",
2050 tag, CHECK);
2051 }
2052 }
2053 u2_array[*u2_index] = index;
2054 *u1_index = i1;
2055 *u2_index = i2;
2056 }
2057
2058 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
2059 u4 code_attribute_length,
2060 bool need_verify,
2061 TRAPS) {
2062 assert(cfs != NULL, "invariant");
2063
2064 if (0 == code_attribute_length) {
2065 return NULL;
2066 }
2067
2068 const u1* const stackmap_table_start = cfs->current();
2069 assert(stackmap_table_start != NULL, "null stackmap table");
2070
2071 // check code_attribute_length first
2072 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2073
2074 if (!need_verify && !DumpSharedSpaces) {
2075 return NULL;
2076 }
2077 return stackmap_table_start;
2078 }
2079
2080 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2081 u2* const checked_exceptions_length,
2082 u4 method_attribute_length,
2083 TRAPS) {
2084 assert(cfs != NULL, "invariant");
2085 assert(checked_exceptions_length != NULL, "invariant");
2086
2087 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2088 *checked_exceptions_length = cfs->get_u2_fast();
2089 const unsigned int size =
2090 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2091 const unsafe_u2* const checked_exceptions_start = cfs->current();
2092 assert(checked_exceptions_start != NULL, "null checked exceptions");
2093 if (!_need_verify) {
2094 cfs->skip_u2_fast(size);
2095 } else {
2096 // Verify each value in the checked exception table
2097 u2 checked_exception;
2098 const u2 len = *checked_exceptions_length;
2099 cfs->guarantee_more(2 * len, CHECK_NULL);
2100 for (int i = 0; i < len; i++) {
2101 checked_exception = cfs->get_u2_fast();
2102 check_property(
2103 valid_klass_reference_at(checked_exception),
2104 "Exception name has bad type at constant pool %u in class file %s",
2105 checked_exception, CHECK_NULL);
2106 }
2107 }
2108 // check exceptions attribute length
2109 if (_need_verify) {
2110 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2111 sizeof(u2) * size),
2112 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2113 }
2114 return checked_exceptions_start;
2115 }
2116
2117 void ClassFileParser::throwIllegalSignature(const char* type,
2118 const Symbol* name,
2119 const Symbol* sig,
2120 TRAPS) const {
2121 assert(name != NULL, "invariant");
2122 assert(sig != NULL, "invariant");
2123
2124 ResourceMark rm(THREAD);
2125 Exceptions::fthrow(THREAD_AND_LOCATION,
2126 vmSymbols::java_lang_ClassFormatError(),
2127 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2128 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2129 }
2130
2131 AnnotationCollector::ID
2132 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2133 const Symbol* name) {
2134 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2135 // Privileged code can use all annotations. Other code silently drops some.
2136 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2137 loader_data->is_platform_class_loader_data() ||
2138 loader_data->is_unsafe_anonymous();
2139 switch (sid) {
2140 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2141 if (_location != _in_method) break; // only allow for methods
2142 if (!privileged) break; // only allow in privileged code
2143 return _method_CallerSensitive;
2144 }
2145 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2146 if (_location != _in_method) break; // only allow for methods
2147 if (!privileged) break; // only allow in privileged code
2148 return _method_ForceInline;
2149 }
2150 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2151 if (_location != _in_method) break; // only allow for methods
2152 if (!privileged) break; // only allow in privileged code
2153 return _method_DontInline;
2154 }
2155 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2156 if (_location != _in_method) break; // only allow for methods
2157 if (!privileged) break; // only allow in privileged code
2158 return _method_InjectedProfile;
2159 }
2160 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2161 if (_location != _in_method) break; // only allow for methods
2162 if (!privileged) break; // only allow in privileged code
2163 return _method_LambdaForm_Compiled;
2164 }
2165 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): {
2166 if (_location != _in_method) break; // only allow for methods
2167 if (!privileged) break; // only allow in privileged code
2168 return _method_LambdaForm_Hidden;
2169 }
2170 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2171 if (_location != _in_method) break; // only allow for methods
2172 if (!privileged) break; // only allow in privileged code
2173 return _method_HotSpotIntrinsicCandidate;
2174 }
2175 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2176 if (_location != _in_field) break; // only allow for fields
2177 if (!privileged) break; // only allow in privileged code
2178 return _field_Stable;
2179 }
2180 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2181 if (_location != _in_field && _location != _in_class) {
2182 break; // only allow for fields and classes
2183 }
2184 if (!EnableContended || (RestrictContended && !privileged)) {
2185 break; // honor privileges
2186 }
2187 return _jdk_internal_vm_annotation_Contended;
2188 }
2189 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2190 if (_location != _in_method) break; // only allow for methods
2191 if (RestrictReservedStack && !privileged) break; // honor privileges
2192 return _jdk_internal_vm_annotation_ReservedStackAccess;
2193 }
2194 default: {
2195 break;
2196 }
2197 }
2198 return AnnotationCollector::_unknown;
2199 }
2200
2201 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2202 if (is_contended())
2203 f->set_contended_group(contended_group());
2204 if (is_stable())
2205 f->set_stable(true);
2206 }
2207
2208 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2209 // If there's an error deallocate metadata for field annotations
2210 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2211 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2212 }
2213
2214 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2215 if (has_annotation(_method_CallerSensitive))
2216 m->set_caller_sensitive(true);
2217 if (has_annotation(_method_ForceInline))
2218 m->set_force_inline(true);
2219 if (has_annotation(_method_DontInline))
2220 m->set_dont_inline(true);
2221 if (has_annotation(_method_InjectedProfile))
2222 m->set_has_injected_profile(true);
2223 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2224 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2225 if (has_annotation(_method_LambdaForm_Hidden))
2226 m->set_hidden(true);
2227 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2228 m->set_intrinsic_candidate(true);
2229 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2230 m->set_has_reserved_stack_access(true);
2231 }
2232
2233 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2234 assert(ik != NULL, "invariant");
2235 ik->set_is_contended(is_contended());
2236 }
2237
2238 #define MAX_ARGS_SIZE 255
2239 #define MAX_CODE_SIZE 65535
2240 #define INITIAL_MAX_LVT_NUMBER 256
2241
2242 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2243 *
2244 * Rules for LVT's and LVTT's are:
2245 * - There can be any number of LVT's and LVTT's.
2246 * - If there are n LVT's, it is the same as if there was just
2247 * one LVT containing all the entries from the n LVT's.
2248 * - There may be no more than one LVT entry per local variable.
2249 * Two LVT entries are 'equal' if these fields are the same:
2250 * start_pc, length, name, slot
2251 * - There may be no more than one LVTT entry per each LVT entry.
2252 * Each LVTT entry has to match some LVT entry.
2253 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2254 */
2255 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2256 int lvt_cnt,
2257 u2* const localvariable_table_length,
2258 const unsafe_u2** const localvariable_table_start,
2259 int lvtt_cnt,
2260 u2* const localvariable_type_table_length,
2261 const unsafe_u2** const localvariable_type_table_start,
2262 TRAPS) {
2263
2264 ResourceMark rm(THREAD);
2265
2266 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2267 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2268
2269 LVT_HashTable* const table = new LVT_HashTable();
2270
2271 // To fill LocalVariableTable in
2272 const Classfile_LVT_Element* cf_lvt;
2273 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2274
2275 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2276 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2277 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2278 copy_lvt_element(&cf_lvt[idx], lvt);
2279 // If no duplicates, add LVT elem in hashtable.
2280 if (table->put(*lvt, lvt) == false
2281 && _need_verify
2282 && _major_version >= JAVA_1_5_VERSION) {
2283 classfile_parse_error("Duplicated LocalVariableTable attribute "
2284 "entry for '%s' in class file %s",
2285 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2286 CHECK);
2287 }
2288 }
2289 }
2290
2291 // To merge LocalVariableTable and LocalVariableTypeTable
2292 const Classfile_LVT_Element* cf_lvtt;
2293 LocalVariableTableElement lvtt_elem;
2294
2295 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2296 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2297 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2298 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2299 LocalVariableTableElement** entry = table->get(lvtt_elem);
2300 if (entry == NULL) {
2301 if (_need_verify) {
2302 classfile_parse_error("LVTT entry for '%s' in class file %s "
2303 "does not match any LVT entry",
2304 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2305 CHECK);
2306 }
2307 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2308 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2309 "entry for '%s' in class file %s",
2310 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2311 CHECK);
2312 } else {
2313 // to add generic signatures into LocalVariableTable
2314 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2315 }
2316 }
2317 }
2318 }
2319
2320
2321 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2322 const u1* runtime_visible_annotations,
2323 int runtime_visible_annotations_length,
2324 const u1* runtime_invisible_annotations,
2325 int runtime_invisible_annotations_length,
2326 const u1* runtime_visible_parameter_annotations,
2327 int runtime_visible_parameter_annotations_length,
2328 const u1* runtime_invisible_parameter_annotations,
2329 int runtime_invisible_parameter_annotations_length,
2330 const u1* runtime_visible_type_annotations,
2331 int runtime_visible_type_annotations_length,
2332 const u1* runtime_invisible_type_annotations,
2333 int runtime_invisible_type_annotations_length,
2334 const u1* annotation_default,
2335 int annotation_default_length,
2336 TRAPS) {
2337
2338 AnnotationArray* a;
2339
2340 if (runtime_visible_annotations_length +
2341 runtime_invisible_annotations_length > 0) {
2342 a = assemble_annotations(runtime_visible_annotations,
2343 runtime_visible_annotations_length,
2344 runtime_invisible_annotations,
2345 runtime_invisible_annotations_length,
2346 CHECK);
2347 cm->set_method_annotations(a);
2348 }
2349
2350 if (runtime_visible_parameter_annotations_length +
2351 runtime_invisible_parameter_annotations_length > 0) {
2352 a = assemble_annotations(runtime_visible_parameter_annotations,
2353 runtime_visible_parameter_annotations_length,
2354 runtime_invisible_parameter_annotations,
2355 runtime_invisible_parameter_annotations_length,
2356 CHECK);
2357 cm->set_parameter_annotations(a);
2358 }
2359
2360 if (annotation_default_length > 0) {
2361 a = assemble_annotations(annotation_default,
2362 annotation_default_length,
2363 NULL,
2364 0,
2365 CHECK);
2366 cm->set_default_annotations(a);
2367 }
2368
2369 if (runtime_visible_type_annotations_length +
2370 runtime_invisible_type_annotations_length > 0) {
2371 a = assemble_annotations(runtime_visible_type_annotations,
2372 runtime_visible_type_annotations_length,
2373 runtime_invisible_type_annotations,
2374 runtime_invisible_type_annotations_length,
2375 CHECK);
2376 cm->set_type_annotations(a);
2377 }
2378 }
2379
2380
2381 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2382 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2383 // Method* to save footprint, so we only know the size of the resulting Method* when the
2384 // entire method attribute is parsed.
2385 //
2386 // The promoted_flags parameter is used to pass relevant access_flags
2387 // from the method back up to the containing klass. These flag values
2388 // are added to klass's access_flags.
2389
2390 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2391 bool is_interface,
2392 bool is_value_type,
2393 const ConstantPool* cp,
2394 AccessFlags* const promoted_flags,
2395 TRAPS) {
2396 assert(cfs != NULL, "invariant");
2397 assert(cp != NULL, "invariant");
2398 assert(promoted_flags != NULL, "invariant");
2399
2400 ResourceMark rm(THREAD);
2401 // Parse fixed parts:
2402 // access_flags, name_index, descriptor_index, attributes_count
2403 cfs->guarantee_more(8, CHECK_NULL);
2404
2405 int flags = cfs->get_u2_fast();
2406 const u2 name_index = cfs->get_u2_fast();
2407 const int cp_size = cp->length();
2408 check_property(
2409 valid_symbol_at(name_index),
2410 "Illegal constant pool index %u for method name in class file %s",
2411 name_index, CHECK_NULL);
2412 const Symbol* const name = cp->symbol_at(name_index);
2413 verify_legal_method_name(name, CHECK_NULL);
2414
2415 const u2 signature_index = cfs->get_u2_fast();
2416 guarantee_property(
2417 valid_symbol_at(signature_index),
2418 "Illegal constant pool index %u for method signature in class file %s",
2419 signature_index, CHECK_NULL);
2420 const Symbol* const signature = cp->symbol_at(signature_index);
2421
2422 if (name == vmSymbols::class_initializer_name()) {
2423 // We ignore the other access flags for a valid class initializer.
2424 // (JVM Spec 2nd ed., chapter 4.6)
2425 if (_major_version < 51) { // backward compatibility
2426 flags = JVM_ACC_STATIC;
2427 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2428 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2429 } else {
2430 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2431 }
2432 } else {
2433 verify_legal_method_modifiers(flags, is_interface, is_value_type, name, CHECK_NULL);
2434 }
2435
2436 if (name == vmSymbols::object_initializer_name()) {
2437 if (is_interface) {
2438 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2439 /* TBD: uncomment when javac stops generating <init>() for value types.
2440 } else if (is_value_type) {
2441 classfile_parse_error("Value Type cannot have a method named <init>, class file %s", CHECK_NULL);
2442 */
2443 }
2444 }
2445
2446 int args_size = -1; // only used when _need_verify is true
2447 if (_need_verify) {
2448 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2449 verify_legal_method_signature(name, signature, CHECK_NULL);
2450 if (args_size > MAX_ARGS_SIZE) {
2451 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2452 }
2453 }
2454
2455 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2456
2457 // Default values for code and exceptions attribute elements
2458 u2 max_stack = 0;
2459 u2 max_locals = 0;
2460 u4 code_length = 0;
2461 const u1* code_start = 0;
2462 u2 exception_table_length = 0;
2463 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2464 Array<int>* exception_handlers = Universe::the_empty_int_array();
2465 u2 checked_exceptions_length = 0;
2466 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2467 CompressedLineNumberWriteStream* linenumber_table = NULL;
2468 int linenumber_table_length = 0;
2469 int total_lvt_length = 0;
2470 u2 lvt_cnt = 0;
2471 u2 lvtt_cnt = 0;
2472 bool lvt_allocated = false;
2473 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2474 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2475 u2* localvariable_table_length = NULL;
2476 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2477 u2* localvariable_type_table_length = NULL;
2478 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2479 int method_parameters_length = -1;
2480 const u1* method_parameters_data = NULL;
2481 bool method_parameters_seen = false;
2482 bool parsed_code_attribute = false;
2483 bool parsed_checked_exceptions_attribute = false;
2484 bool parsed_stackmap_attribute = false;
2485 // stackmap attribute - JDK1.5
2486 const u1* stackmap_data = NULL;
2487 int stackmap_data_length = 0;
2488 u2 generic_signature_index = 0;
2489 MethodAnnotationCollector parsed_annotations;
2490 const u1* runtime_visible_annotations = NULL;
2491 int runtime_visible_annotations_length = 0;
2492 const u1* runtime_invisible_annotations = NULL;
2493 int runtime_invisible_annotations_length = 0;
2494 const u1* runtime_visible_parameter_annotations = NULL;
2495 int runtime_visible_parameter_annotations_length = 0;
2496 const u1* runtime_invisible_parameter_annotations = NULL;
2497 int runtime_invisible_parameter_annotations_length = 0;
2498 const u1* runtime_visible_type_annotations = NULL;
2499 int runtime_visible_type_annotations_length = 0;
2500 const u1* runtime_invisible_type_annotations = NULL;
2501 int runtime_invisible_type_annotations_length = 0;
2502 bool runtime_invisible_annotations_exists = false;
2503 bool runtime_invisible_type_annotations_exists = false;
2504 bool runtime_invisible_parameter_annotations_exists = false;
2505 const u1* annotation_default = NULL;
2506 int annotation_default_length = 0;
2507
2508 // Parse code and exceptions attribute
2509 u2 method_attributes_count = cfs->get_u2_fast();
2510 while (method_attributes_count--) {
2511 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2512 const u2 method_attribute_name_index = cfs->get_u2_fast();
2513 const u4 method_attribute_length = cfs->get_u4_fast();
2514 check_property(
2515 valid_symbol_at(method_attribute_name_index),
2516 "Invalid method attribute name index %u in class file %s",
2517 method_attribute_name_index, CHECK_NULL);
2518
2519 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2520 if (method_attribute_name == vmSymbols::tag_code()) {
2521 // Parse Code attribute
2522 if (_need_verify) {
2523 guarantee_property(
2524 !access_flags.is_native() && !access_flags.is_abstract(),
2525 "Code attribute in native or abstract methods in class file %s",
2526 CHECK_NULL);
2527 }
2528 if (parsed_code_attribute) {
2529 classfile_parse_error("Multiple Code attributes in class file %s",
2530 CHECK_NULL);
2531 }
2532 parsed_code_attribute = true;
2533
2534 // Stack size, locals size, and code size
2535 if (_major_version == 45 && _minor_version <= 2) {
2536 cfs->guarantee_more(4, CHECK_NULL);
2537 max_stack = cfs->get_u1_fast();
2538 max_locals = cfs->get_u1_fast();
2539 code_length = cfs->get_u2_fast();
2540 } else {
2541 cfs->guarantee_more(8, CHECK_NULL);
2542 max_stack = cfs->get_u2_fast();
2543 max_locals = cfs->get_u2_fast();
2544 code_length = cfs->get_u4_fast();
2545 }
2546 if (_need_verify) {
2547 guarantee_property(args_size <= max_locals,
2548 "Arguments can't fit into locals in class file %s",
2549 CHECK_NULL);
2550 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2551 "Invalid method Code length %u in class file %s",
2552 code_length, CHECK_NULL);
2553 }
2554 // Code pointer
2555 code_start = cfs->current();
2556 assert(code_start != NULL, "null code start");
2557 cfs->guarantee_more(code_length, CHECK_NULL);
2558 cfs->skip_u1_fast(code_length);
2559
2560 // Exception handler table
2561 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2562 exception_table_length = cfs->get_u2_fast();
2563 if (exception_table_length > 0) {
2564 exception_table_start = parse_exception_table(cfs,
2565 code_length,
2566 exception_table_length,
2567 CHECK_NULL);
2568 }
2569
2570 // Parse additional attributes in code attribute
2571 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2572 u2 code_attributes_count = cfs->get_u2_fast();
2573
2574 unsigned int calculated_attribute_length = 0;
2575
2576 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2577 calculated_attribute_length =
2578 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2579 } else {
2580 // max_stack, locals and length are smaller in pre-version 45.2 classes
2581 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2582 }
2583 calculated_attribute_length +=
2584 code_length +
2585 sizeof(exception_table_length) +
2586 sizeof(code_attributes_count) +
2587 exception_table_length *
2588 ( sizeof(u2) + // start_pc
2589 sizeof(u2) + // end_pc
2590 sizeof(u2) + // handler_pc
2591 sizeof(u2) ); // catch_type_index
2592
2593 while (code_attributes_count--) {
2594 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2595 const u2 code_attribute_name_index = cfs->get_u2_fast();
2596 const u4 code_attribute_length = cfs->get_u4_fast();
2597 calculated_attribute_length += code_attribute_length +
2598 sizeof(code_attribute_name_index) +
2599 sizeof(code_attribute_length);
2600 check_property(valid_symbol_at(code_attribute_name_index),
2601 "Invalid code attribute name index %u in class file %s",
2602 code_attribute_name_index,
2603 CHECK_NULL);
2604 if (LoadLineNumberTables &&
2605 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2606 // Parse and compress line number table
2607 parse_linenumber_table(code_attribute_length,
2608 code_length,
2609 &linenumber_table,
2610 CHECK_NULL);
2611
2612 } else if (LoadLocalVariableTables &&
2613 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2614 // Parse local variable table
2615 if (!lvt_allocated) {
2616 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2617 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2618 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2619 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2620 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2621 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2622 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2623 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2624 lvt_allocated = true;
2625 }
2626 if (lvt_cnt == max_lvt_cnt) {
2627 max_lvt_cnt <<= 1;
2628 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2629 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2630 }
2631 localvariable_table_start[lvt_cnt] =
2632 parse_localvariable_table(cfs,
2633 code_length,
2634 max_locals,
2635 code_attribute_length,
2636 &localvariable_table_length[lvt_cnt],
2637 false, // is not LVTT
2638 CHECK_NULL);
2639 total_lvt_length += localvariable_table_length[lvt_cnt];
2640 lvt_cnt++;
2641 } else if (LoadLocalVariableTypeTables &&
2642 _major_version >= JAVA_1_5_VERSION &&
2643 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2644 if (!lvt_allocated) {
2645 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2646 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2647 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2648 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2649 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2650 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2651 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2652 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2653 lvt_allocated = true;
2654 }
2655 // Parse local variable type table
2656 if (lvtt_cnt == max_lvtt_cnt) {
2657 max_lvtt_cnt <<= 1;
2658 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2659 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2660 }
2661 localvariable_type_table_start[lvtt_cnt] =
2662 parse_localvariable_table(cfs,
2663 code_length,
2664 max_locals,
2665 code_attribute_length,
2666 &localvariable_type_table_length[lvtt_cnt],
2667 true, // is LVTT
2668 CHECK_NULL);
2669 lvtt_cnt++;
2670 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2671 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2672 // Stack map is only needed by the new verifier in JDK1.5.
2673 if (parsed_stackmap_attribute) {
2674 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2675 }
2676 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2677 stackmap_data_length = code_attribute_length;
2678 parsed_stackmap_attribute = true;
2679 } else {
2680 // Skip unknown attributes
2681 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2682 }
2683 }
2684 // check method attribute length
2685 if (_need_verify) {
2686 guarantee_property(method_attribute_length == calculated_attribute_length,
2687 "Code segment has wrong length in class file %s",
2688 CHECK_NULL);
2689 }
2690 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2691 // Parse Exceptions attribute
2692 if (parsed_checked_exceptions_attribute) {
2693 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2694 CHECK_NULL);
2695 }
2696 parsed_checked_exceptions_attribute = true;
2697 checked_exceptions_start =
2698 parse_checked_exceptions(cfs,
2699 &checked_exceptions_length,
2700 method_attribute_length,
2701 CHECK_NULL);
2702 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2703 // reject multiple method parameters
2704 if (method_parameters_seen) {
2705 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2706 CHECK_NULL);
2707 }
2708 method_parameters_seen = true;
2709 method_parameters_length = cfs->get_u1_fast();
2710 const u2 real_length = (method_parameters_length * 4u) + 1u;
2711 if (method_attribute_length != real_length) {
2712 classfile_parse_error(
2713 "Invalid MethodParameters method attribute length %u in class file",
2714 method_attribute_length, CHECK_NULL);
2715 }
2716 method_parameters_data = cfs->current();
2717 cfs->skip_u2_fast(method_parameters_length);
2718 cfs->skip_u2_fast(method_parameters_length);
2719 // ignore this attribute if it cannot be reflected
2720 if (!SystemDictionary::Parameter_klass_loaded())
2721 method_parameters_length = -1;
2722 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2723 if (method_attribute_length != 0) {
2724 classfile_parse_error(
2725 "Invalid Synthetic method attribute length %u in class file %s",
2726 method_attribute_length, CHECK_NULL);
2727 }
2728 // Should we check that there hasn't already been a synthetic attribute?
2729 access_flags.set_is_synthetic();
2730 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2731 if (method_attribute_length != 0) {
2732 classfile_parse_error(
2733 "Invalid Deprecated method attribute length %u in class file %s",
2734 method_attribute_length, CHECK_NULL);
2735 }
2736 } else if (_major_version >= JAVA_1_5_VERSION) {
2737 if (method_attribute_name == vmSymbols::tag_signature()) {
2738 if (generic_signature_index != 0) {
2739 classfile_parse_error(
2740 "Multiple Signature attributes for method in class file %s",
2741 CHECK_NULL);
2742 }
2743 if (method_attribute_length != 2) {
2744 classfile_parse_error(
2745 "Invalid Signature attribute length %u in class file %s",
2746 method_attribute_length, CHECK_NULL);
2747 }
2748 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2749 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2750 if (runtime_visible_annotations != NULL) {
2751 classfile_parse_error(
2752 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2753 CHECK_NULL);
2754 }
2755 runtime_visible_annotations_length = method_attribute_length;
2756 runtime_visible_annotations = cfs->current();
2757 assert(runtime_visible_annotations != NULL, "null visible annotations");
2758 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2759 parse_annotations(cp,
2760 runtime_visible_annotations,
2761 runtime_visible_annotations_length,
2762 &parsed_annotations,
2763 _loader_data,
2764 CHECK_NULL);
2765 cfs->skip_u1_fast(runtime_visible_annotations_length);
2766 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2767 if (runtime_invisible_annotations_exists) {
2768 classfile_parse_error(
2769 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2770 CHECK_NULL);
2771 }
2772 runtime_invisible_annotations_exists = true;
2773 if (PreserveAllAnnotations) {
2774 runtime_invisible_annotations_length = method_attribute_length;
2775 runtime_invisible_annotations = cfs->current();
2776 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2777 }
2778 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2779 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2780 if (runtime_visible_parameter_annotations != NULL) {
2781 classfile_parse_error(
2782 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2783 CHECK_NULL);
2784 }
2785 runtime_visible_parameter_annotations_length = method_attribute_length;
2786 runtime_visible_parameter_annotations = cfs->current();
2787 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2788 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2789 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2790 if (runtime_invisible_parameter_annotations_exists) {
2791 classfile_parse_error(
2792 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2793 CHECK_NULL);
2794 }
2795 runtime_invisible_parameter_annotations_exists = true;
2796 if (PreserveAllAnnotations) {
2797 runtime_invisible_parameter_annotations_length = method_attribute_length;
2798 runtime_invisible_parameter_annotations = cfs->current();
2799 assert(runtime_invisible_parameter_annotations != NULL,
2800 "null invisible parameter annotations");
2801 }
2802 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2803 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2804 if (annotation_default != NULL) {
2805 classfile_parse_error(
2806 "Multiple AnnotationDefault attributes for method in class file %s",
2807 CHECK_NULL);
2808 }
2809 annotation_default_length = method_attribute_length;
2810 annotation_default = cfs->current();
2811 assert(annotation_default != NULL, "null annotation default");
2812 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2813 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2814 if (runtime_visible_type_annotations != NULL) {
2815 classfile_parse_error(
2816 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2817 CHECK_NULL);
2818 }
2819 runtime_visible_type_annotations_length = method_attribute_length;
2820 runtime_visible_type_annotations = cfs->current();
2821 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2822 // No need for the VM to parse Type annotations
2823 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2824 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2825 if (runtime_invisible_type_annotations_exists) {
2826 classfile_parse_error(
2827 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2828 CHECK_NULL);
2829 } else {
2830 runtime_invisible_type_annotations_exists = true;
2831 }
2832 if (PreserveAllAnnotations) {
2833 runtime_invisible_type_annotations_length = method_attribute_length;
2834 runtime_invisible_type_annotations = cfs->current();
2835 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2836 }
2837 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2838 } else {
2839 // Skip unknown attributes
2840 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2841 }
2842 } else {
2843 // Skip unknown attributes
2844 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2845 }
2846 }
2847
2848 if (linenumber_table != NULL) {
2849 linenumber_table->write_terminator();
2850 linenumber_table_length = linenumber_table->position();
2851 }
2852
2853 // Make sure there's at least one Code attribute in non-native/non-abstract method
2854 if (_need_verify) {
2855 guarantee_property(access_flags.is_native() ||
2856 access_flags.is_abstract() ||
2857 parsed_code_attribute,
2858 "Absent Code attribute in method that is not native or abstract in class file %s",
2859 CHECK_NULL);
2860 }
2861
2862 // All sizing information for a Method* is finally available, now create it
2863 InlineTableSizes sizes(
2864 total_lvt_length,
2865 linenumber_table_length,
2866 exception_table_length,
2867 checked_exceptions_length,
2868 method_parameters_length,
2869 generic_signature_index,
2870 runtime_visible_annotations_length +
2871 runtime_invisible_annotations_length,
2872 runtime_visible_parameter_annotations_length +
2873 runtime_invisible_parameter_annotations_length,
2874 runtime_visible_type_annotations_length +
2875 runtime_invisible_type_annotations_length,
2876 annotation_default_length,
2877 0);
2878
2879 Method* const m = Method::allocate(_loader_data,
2880 code_length,
2881 access_flags,
2882 &sizes,
2883 ConstMethod::NORMAL,
2884 CHECK_NULL);
2885
2886 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2887
2888 // Fill in information from fixed part (access_flags already set)
2889 m->set_constants(_cp);
2890 m->set_name_index(name_index);
2891 m->set_signature_index(signature_index);
2892
2893 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2894 m->constMethod()->set_result_type(rtf.type());
2895
2896 if (args_size >= 0) {
2897 m->set_size_of_parameters(args_size);
2898 } else {
2899 m->compute_size_of_parameters(THREAD);
2900 }
2901 #ifdef ASSERT
2902 if (args_size >= 0) {
2903 m->compute_size_of_parameters(THREAD);
2904 assert(args_size == m->size_of_parameters(), "");
2905 }
2906 #endif
2907
2908 // Fill in code attribute information
2909 m->set_max_stack(max_stack);
2910 m->set_max_locals(max_locals);
2911 if (stackmap_data != NULL) {
2912 m->constMethod()->copy_stackmap_data(_loader_data,
2913 (u1*)stackmap_data,
2914 stackmap_data_length,
2915 CHECK_NULL);
2916 }
2917
2918 // Copy byte codes
2919 m->set_code((u1*)code_start);
2920
2921 // Copy line number table
2922 if (linenumber_table != NULL) {
2923 memcpy(m->compressed_linenumber_table(),
2924 linenumber_table->buffer(),
2925 linenumber_table_length);
2926 }
2927
2928 // Copy exception table
2929 if (exception_table_length > 0) {
2930 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2931 m->exception_table_start(),
2932 exception_table_length * sizeof(ExceptionTableElement),
2933 sizeof(u2));
2934 }
2935
2936 // Copy method parameters
2937 if (method_parameters_length > 0) {
2938 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2939 for (int i = 0; i < method_parameters_length; i++) {
2940 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2941 method_parameters_data += 2;
2942 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2943 method_parameters_data += 2;
2944 }
2945 }
2946
2947 // Copy checked exceptions
2948 if (checked_exceptions_length > 0) {
2949 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2950 m->checked_exceptions_start(),
2951 checked_exceptions_length * sizeof(CheckedExceptionElement),
2952 sizeof(u2));
2953 }
2954
2955 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2956 if (total_lvt_length > 0) {
2957 promoted_flags->set_has_localvariable_table();
2958 copy_localvariable_table(m->constMethod(),
2959 lvt_cnt,
2960 localvariable_table_length,
2961 localvariable_table_start,
2962 lvtt_cnt,
2963 localvariable_type_table_length,
2964 localvariable_type_table_start,
2965 CHECK_NULL);
2966 }
2967
2968 if (parsed_annotations.has_any_annotations())
2969 parsed_annotations.apply_to(m);
2970
2971 // Copy annotations
2972 copy_method_annotations(m->constMethod(),
2973 runtime_visible_annotations,
2974 runtime_visible_annotations_length,
2975 runtime_invisible_annotations,
2976 runtime_invisible_annotations_length,
2977 runtime_visible_parameter_annotations,
2978 runtime_visible_parameter_annotations_length,
2979 runtime_invisible_parameter_annotations,
2980 runtime_invisible_parameter_annotations_length,
2981 runtime_visible_type_annotations,
2982 runtime_visible_type_annotations_length,
2983 runtime_invisible_type_annotations,
2984 runtime_invisible_type_annotations_length,
2985 annotation_default,
2986 annotation_default_length,
2987 CHECK_NULL);
2988
2989 if (name == vmSymbols::finalize_method_name() &&
2990 signature == vmSymbols::void_method_signature()) {
2991 if (m->is_empty_method()) {
2992 _has_empty_finalizer = true;
2993 } else {
2994 _has_finalizer = true;
2995 }
2996 }
2997 if (name == vmSymbols::object_initializer_name() &&
2998 signature == vmSymbols::void_method_signature() &&
2999 m->is_vanilla_constructor()) {
3000 _has_vanilla_constructor = true;
3001 }
3002
3003 NOT_PRODUCT(m->verify());
3004 return m;
3005 }
3006
3007
3008 // The promoted_flags parameter is used to pass relevant access_flags
3009 // from the methods back up to the containing klass. These flag values
3010 // are added to klass's access_flags.
3011 // Side-effects: populates the _methods field in the parser
3012 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
3013 bool is_interface,
3014 bool is_value_type,
3015 AccessFlags* promoted_flags,
3016 bool* has_final_method,
3017 bool* declares_nonstatic_concrete_methods,
3018 TRAPS) {
3019 assert(cfs != NULL, "invariant");
3020 assert(promoted_flags != NULL, "invariant");
3021 assert(has_final_method != NULL, "invariant");
3022 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
3023
3024 assert(NULL == _methods, "invariant");
3025
3026 cfs->guarantee_more(2, CHECK); // length
3027 const u2 length = cfs->get_u2_fast();
3028 if (length == 0) {
3029 _methods = Universe::the_empty_method_array();
3030 } else {
3031 _methods = MetadataFactory::new_array<Method*>(_loader_data,
3032 length,
3033 NULL,
3034 CHECK);
3035
3036 for (int index = 0; index < length; index++) {
3037 Method* method = parse_method(cfs,
3038 is_interface,
3039 is_value_type,
3040 _cp,
3041 promoted_flags,
3042 CHECK);
3043
3044 if (method->is_final()) {
3045 *has_final_method = true;
3046 }
3047 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
3048 // used for interface initialization, and default method inheritance analysis
3049 if (is_interface && !(*declares_nonstatic_concrete_methods)
3050 && !method->is_abstract() && !method->is_static()) {
3051 *declares_nonstatic_concrete_methods = true;
3052 }
3053 _methods->at_put(index, method);
3054 }
3055
3056 if (_need_verify && length > 1) {
3057 // Check duplicated methods
3058 ResourceMark rm(THREAD);
3059 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
3060 THREAD, NameSigHash*, HASH_ROW_SIZE);
3061 initialize_hashtable(names_and_sigs);
3062 bool dup = false;
3063 const Symbol* name = NULL;
3064 const Symbol* sig = NULL;
3065 {
3066 debug_only(NoSafepointVerifier nsv;)
3067 for (int i = 0; i < length; i++) {
3068 const Method* const m = _methods->at(i);
3069 name = m->name();
3070 sig = m->signature();
3071 // If no duplicates, add name/signature in hashtable names_and_sigs.
3072 if (!put_after_lookup(name, sig, names_and_sigs)) {
3073 dup = true;
3074 break;
3075 }
3076 }
3077 }
3078 if (dup) {
3079 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
3080 name->as_C_string(), sig->as_klass_external_name(), CHECK);
3081 }
3082 }
3083 }
3084 }
3085
3086 static const intArray* sort_methods(Array<Method*>* methods) {
3087 const int length = methods->length();
3088 // If JVMTI original method ordering or sharing is enabled we have to
3089 // remember the original class file ordering.
3090 // We temporarily use the vtable_index field in the Method* to store the
3091 // class file index, so we can read in after calling qsort.
3092 // Put the method ordering in the shared archive.
3093 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3094 for (int index = 0; index < length; index++) {
3095 Method* const m = methods->at(index);
3096 assert(!m->valid_vtable_index(), "vtable index should not be set");
3097 m->set_vtable_index(index);
3098 }
3099 }
3100 // Sort method array by ascending method name (for faster lookups & vtable construction)
3101 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3102 Method::sort_methods(methods);
3103
3104 intArray* method_ordering = NULL;
3105 // If JVMTI original method ordering or sharing is enabled construct int
3106 // array remembering the original ordering
3107 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3108 method_ordering = new intArray(length, length, -1);
3109 for (int index = 0; index < length; index++) {
3110 Method* const m = methods->at(index);
3111 const int old_index = m->vtable_index();
3112 assert(old_index >= 0 && old_index < length, "invalid method index");
3113 method_ordering->at_put(index, old_index);
3114 m->set_vtable_index(Method::invalid_vtable_index);
3115 }
3116 }
3117 return method_ordering;
3118 }
3119
3120 // Parse generic_signature attribute for methods and fields
3121 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3122 TRAPS) {
3123 assert(cfs != NULL, "invariant");
3124
3125 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3126 const u2 generic_signature_index = cfs->get_u2_fast();
3127 check_property(
3128 valid_symbol_at(generic_signature_index),
3129 "Invalid Signature attribute at constant pool index %u in class file %s",
3130 generic_signature_index, CHECK_0);
3131 return generic_signature_index;
3132 }
3133
3134 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3135 TRAPS) {
3136
3137 assert(cfs != NULL, "invariant");
3138
3139 cfs->guarantee_more(2, CHECK); // sourcefile_index
3140 const u2 sourcefile_index = cfs->get_u2_fast();
3141 check_property(
3142 valid_symbol_at(sourcefile_index),
3143 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3144 sourcefile_index, CHECK);
3145 set_class_sourcefile_index(sourcefile_index);
3146 }
3147
3148 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3149 int length,
3150 TRAPS) {
3151 assert(cfs != NULL, "invariant");
3152
3153 const u1* const sde_buffer = cfs->current();
3154 assert(sde_buffer != NULL, "null sde buffer");
3155
3156 // Don't bother storing it if there is no way to retrieve it
3157 if (JvmtiExport::can_get_source_debug_extension()) {
3158 assert((length+1) > length, "Overflow checking");
3159 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3160 for (int i = 0; i < length; i++) {
3161 sde[i] = sde_buffer[i];
3162 }
3163 sde[length] = '\0';
3164 set_class_sde_buffer((const char*)sde, length);
3165 }
3166 // Got utf8 string, set stream position forward
3167 cfs->skip_u1(length, CHECK);
3168 }
3169
3170
3171 // Inner classes can be static, private or protected (classic VM does this)
3172 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3173 JVM_ACC_PRIVATE | \
3174 JVM_ACC_PROTECTED | \
3175 JVM_ACC_STATIC \
3176 )
3177
3178 u2 ClassFileParser::parse_value_types_attribute(const ClassFileStream* const cfs,
3179 const u1* const value_types_attribute_start,
3180 TRAPS) {
3181 const u1* const current_mark = cfs->current();
3182 u2 length = 0;
3183 if (value_types_attribute_start != NULL) {
3184 cfs->set_current(value_types_attribute_start);
3185 cfs->guarantee_more(2, CHECK_0); // length
3186 length = cfs->get_u2_fast();
3187 }
3188 Array<ValueTypes>* const value_types = MetadataFactory::new_array<ValueTypes>(_loader_data, length, CHECK_0);
3189
3190 int index = 0;
3191 const int cp_size = _cp->length();
3192 cfs->guarantee_more(2 *length, CHECK_0);
3193 for (int n = 0; n < length; n++) {
3194 // Value types class index
3195 const u2 value_types_info_index = cfs->get_u2_fast();
3196 check_property(
3197 valid_klass_reference_at(value_types_info_index),
3198 "value_types_info_index %u has bad constant type in class file %s",
3199 value_types_info_index, CHECK_0);
3200 ValueTypes vt;
3201 vt._class_info_index = value_types_info_index;
3202 vt._class_name = NULL;
3203 value_types->at_put(index++, vt);
3204 }
3205 _value_types = value_types;
3206 // Restore buffer's current position.
3207 cfs->set_current(current_mark);
3208
3209 return length;
3210 }
3211
3212 // Return number of classes in the inner classes attribute table
3213 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3214 const u1* const inner_classes_attribute_start,
3215 bool parsed_enclosingmethod_attribute,
3216 u2 enclosing_method_class_index,
3217 u2 enclosing_method_method_index,
3218 TRAPS) {
3219 const u1* const current_mark = cfs->current();
3220 u2 length = 0;
3221 if (inner_classes_attribute_start != NULL) {
3222 cfs->set_current(inner_classes_attribute_start);
3223 cfs->guarantee_more(2, CHECK_0); // length
3224 length = cfs->get_u2_fast();
3225 }
3226
3227 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3228 // method data:
3229 // [inner_class_info_index,
3230 // outer_class_info_index,
3231 // inner_name_index,
3232 // inner_class_access_flags,
3233 // ...
3234 // enclosing_method_class_index,
3235 // enclosing_method_method_index]
3236 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3237 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3238 _inner_classes = inner_classes;
3239
3240 int index = 0;
3241 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3242 for (int n = 0; n < length; n++) {
3243 // Inner class index
3244 const u2 inner_class_info_index = cfs->get_u2_fast();
3245 check_property(
3246 valid_klass_reference_at(inner_class_info_index),
3247 "inner_class_info_index %u has bad constant type in class file %s",
3248 inner_class_info_index, CHECK_0);
3249 // Outer class index
3250 const u2 outer_class_info_index = cfs->get_u2_fast();
3251 check_property(
3252 outer_class_info_index == 0 ||
3253 valid_klass_reference_at(outer_class_info_index),
3254 "outer_class_info_index %u has bad constant type in class file %s",
3255 outer_class_info_index, CHECK_0);
3256 // Inner class name
3257 const u2 inner_name_index = cfs->get_u2_fast();
3258 check_property(
3259 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3260 "inner_name_index %u has bad constant type in class file %s",
3261 inner_name_index, CHECK_0);
3262 if (_need_verify) {
3263 guarantee_property(inner_class_info_index != outer_class_info_index,
3264 "Class is both outer and inner class in class file %s", CHECK_0);
3265 }
3266
3267 jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3268 // JVM_ACC_MODULE is defined in JDK-9 and later.
3269 if (_major_version >= JAVA_9_VERSION) {
3270 recognized_modifiers |= JVM_ACC_MODULE;
3271 }
3272 // JVM_ACC_VALUE is defined for class file version 55 and later
3273 if (supports_value_types()) {
3274 recognized_modifiers |= JVM_ACC_VALUE;
3275 }
3276
3277 // Access flags
3278 jint flags = cfs->get_u2_fast() & recognized_modifiers;
3279
3280 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3281 // Set abstract bit for old class files for backward compatibility
3282 flags |= JVM_ACC_ABSTRACT;
3283 }
3284 verify_legal_class_modifiers(flags, CHECK_0);
3285 AccessFlags inner_access_flags(flags);
3286
3287 inner_classes->at_put(index++, inner_class_info_index);
3288 inner_classes->at_put(index++, outer_class_info_index);
3289 inner_classes->at_put(index++, inner_name_index);
3290 inner_classes->at_put(index++, inner_access_flags.as_short());
3291 }
3292
3293 // 4347400: make sure there's no duplicate entry in the classes array
3294 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3295 for(int i = 0; i < length * 4; i += 4) {
3296 for(int j = i + 4; j < length * 4; j += 4) {
3297 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3298 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3299 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3300 inner_classes->at(i+3) != inner_classes->at(j+3)),
3301 "Duplicate entry in InnerClasses in class file %s",
3302 CHECK_0);
3303 }
3304 }
3305 }
3306
3307 // Set EnclosingMethod class and method indexes.
3308 if (parsed_enclosingmethod_attribute) {
3309 inner_classes->at_put(index++, enclosing_method_class_index);
3310 inner_classes->at_put(index++, enclosing_method_method_index);
3311 }
3312 assert(index == size, "wrong size");
3313
3314 // Restore buffer's current position.
3315 cfs->set_current(current_mark);
3316
3317 return length;
3318 }
3319
3320 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3321 const u1* const nest_members_attribute_start,
3322 TRAPS) {
3323 const u1* const current_mark = cfs->current();
3324 u2 length = 0;
3325 if (nest_members_attribute_start != NULL) {
3326 cfs->set_current(nest_members_attribute_start);
3327 cfs->guarantee_more(2, CHECK_0); // length
3328 length = cfs->get_u2_fast();
3329 }
3330 const int size = length;
3331 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3332 _nest_members = nest_members;
3333
3334 int index = 0;
3335 cfs->guarantee_more(2 * length, CHECK_0);
3336 for (int n = 0; n < length; n++) {
3337 const u2 class_info_index = cfs->get_u2_fast();
3338 check_property(
3339 valid_klass_reference_at(class_info_index),
3340 "Nest member class_info_index %u has bad constant type in class file %s",
3341 class_info_index, CHECK_0);
3342 nest_members->at_put(index++, class_info_index);
3343 }
3344 assert(index == size, "wrong size");
3345
3346 // Restore buffer's current position.
3347 cfs->set_current(current_mark);
3348
3349 return length;
3350 }
3351
3352 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3353 set_class_synthetic_flag(true);
3354 }
3355
3356 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3357 assert(cfs != NULL, "invariant");
3358
3359 const u2 signature_index = cfs->get_u2(CHECK);
3360 check_property(
3361 valid_symbol_at(signature_index),
3362 "Invalid constant pool index %u in Signature attribute in class file %s",
3363 signature_index, CHECK);
3364 set_class_generic_signature_index(signature_index);
3365 }
3366
3367 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3368 ConstantPool* cp,
3369 u4 attribute_byte_length,
3370 TRAPS) {
3371 assert(cfs != NULL, "invariant");
3372 assert(cp != NULL, "invariant");
3373
3374 const u1* const current_start = cfs->current();
3375
3376 guarantee_property(attribute_byte_length >= sizeof(u2),
3377 "Invalid BootstrapMethods attribute length %u in class file %s",
3378 attribute_byte_length,
3379 CHECK);
3380
3381 cfs->guarantee_more(attribute_byte_length, CHECK);
3382
3383 const int attribute_array_length = cfs->get_u2_fast();
3384
3385 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3386 "Short length on BootstrapMethods in class file %s",
3387 CHECK);
3388
3389
3390 // The attribute contains a counted array of counted tuples of shorts,
3391 // represending bootstrap specifiers:
3392 // length*{bootstrap_method_index, argument_count*{argument_index}}
3393 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3394 // operand_count = number of shorts in attr, except for leading length
3395
3396 // The attribute is copied into a short[] array.
3397 // The array begins with a series of short[2] pairs, one for each tuple.
3398 const int index_size = (attribute_array_length * 2);
3399
3400 Array<u2>* const operands =
3401 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3402
3403 // Eagerly assign operands so they will be deallocated with the constant
3404 // pool if there is an error.
3405 cp->set_operands(operands);
3406
3407 int operand_fill_index = index_size;
3408 const int cp_size = cp->length();
3409
3410 for (int n = 0; n < attribute_array_length; n++) {
3411 // Store a 32-bit offset into the header of the operand array.
3412 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3413
3414 // Read a bootstrap specifier.
3415 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3416 const u2 bootstrap_method_index = cfs->get_u2_fast();
3417 const u2 argument_count = cfs->get_u2_fast();
3418 check_property(
3419 valid_cp_range(bootstrap_method_index, cp_size) &&
3420 cp->tag_at(bootstrap_method_index).is_method_handle(),
3421 "bootstrap_method_index %u has bad constant type in class file %s",
3422 bootstrap_method_index,
3423 CHECK);
3424
3425 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3426 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3427 CHECK);
3428
3429 operands->at_put(operand_fill_index++, bootstrap_method_index);
3430 operands->at_put(operand_fill_index++, argument_count);
3431
3432 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3433 for (int j = 0; j < argument_count; j++) {
3434 const u2 argument_index = cfs->get_u2_fast();
3435 check_property(
3436 valid_cp_range(argument_index, cp_size) &&
3437 cp->tag_at(argument_index).is_loadable_constant(),
3438 "argument_index %u has bad constant type in class file %s",
3439 argument_index,
3440 CHECK);
3441 operands->at_put(operand_fill_index++, argument_index);
3442 }
3443 }
3444 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3445 "Bad length on BootstrapMethods in class file %s",
3446 CHECK);
3447 }
3448
3449 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3450 ConstantPool* cp,
3451 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3452 TRAPS) {
3453 assert(cfs != NULL, "invariant");
3454 assert(cp != NULL, "invariant");
3455 assert(parsed_annotations != NULL, "invariant");
3456
3457 // Set inner classes attribute to default sentinel
3458 _inner_classes = Universe::the_empty_short_array();
3459 // Set nest members attribute to default sentinel
3460 _nest_members = Universe::the_empty_short_array();
3461 cfs->guarantee_more(2, CHECK); // attributes_count
3462 u2 attributes_count = cfs->get_u2_fast();
3463 bool parsed_sourcefile_attribute = false;
3464 bool parsed_innerclasses_attribute = false;
3465 bool parsed_nest_members_attribute = false;
3466 bool parsed_nest_host_attribute = false;
3467 bool parsed_value_types_attribute = false;
3468 bool parsed_enclosingmethod_attribute = false;
3469 bool parsed_bootstrap_methods_attribute = false;
3470 const u1* runtime_visible_annotations = NULL;
3471 int runtime_visible_annotations_length = 0;
3472 const u1* runtime_invisible_annotations = NULL;
3473 int runtime_invisible_annotations_length = 0;
3474 const u1* runtime_visible_type_annotations = NULL;
3475 int runtime_visible_type_annotations_length = 0;
3476 const u1* runtime_invisible_type_annotations = NULL;
3477 int runtime_invisible_type_annotations_length = 0;
3478 bool runtime_invisible_type_annotations_exists = false;
3479 bool runtime_invisible_annotations_exists = false;
3480 bool parsed_source_debug_ext_annotations_exist = false;
3481 const u1* inner_classes_attribute_start = NULL;
3482 u4 inner_classes_attribute_length = 0;
3483 const u1* value_types_attribute_start = NULL;
3484 u4 value_types_attribute_length = 0;
3485 u2 enclosing_method_class_index = 0;
3486 u2 enclosing_method_method_index = 0;
3487 const u1* nest_members_attribute_start = NULL;
3488 u4 nest_members_attribute_length = 0;
3489
3490 // Iterate over attributes
3491 while (attributes_count--) {
3492 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3493 const u2 attribute_name_index = cfs->get_u2_fast();
3494 const u4 attribute_length = cfs->get_u4_fast();
3495 check_property(
3496 valid_symbol_at(attribute_name_index),
3497 "Attribute name has bad constant pool index %u in class file %s",
3498 attribute_name_index, CHECK);
3499 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3500 if (tag == vmSymbols::tag_source_file()) {
3501 // Check for SourceFile tag
3502 if (_need_verify) {
3503 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3504 }
3505 if (parsed_sourcefile_attribute) {
3506 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3507 } else {
3508 parsed_sourcefile_attribute = true;
3509 }
3510 parse_classfile_sourcefile_attribute(cfs, CHECK);
3511 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3512 // Check for SourceDebugExtension tag
3513 if (parsed_source_debug_ext_annotations_exist) {
3514 classfile_parse_error(
3515 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3516 }
3517 parsed_source_debug_ext_annotations_exist = true;
3518 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3519 } else if (tag == vmSymbols::tag_inner_classes()) {
3520 // Check for InnerClasses tag
3521 if (parsed_innerclasses_attribute) {
3522 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3523 } else {
3524 parsed_innerclasses_attribute = true;
3525 }
3526 inner_classes_attribute_start = cfs->current();
3527 inner_classes_attribute_length = attribute_length;
3528 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3529 } else if (tag == vmSymbols::tag_value_types()) {
3530 // Check for ValueTypes tag
3531 if (parsed_value_types_attribute) {
3532 classfile_parse_error("Multiple ValueTypes attributes in class file %s", CHECK);
3533 } else {
3534 parsed_value_types_attribute = true;
3535 }
3536 value_types_attribute_start = cfs->current();
3537 value_types_attribute_length = attribute_length;
3538 cfs->skip_u1(value_types_attribute_length, CHECK);
3539 } else if (tag == vmSymbols::tag_synthetic()) {
3540 // Check for Synthetic tag
3541 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3542 if (attribute_length != 0) {
3543 classfile_parse_error(
3544 "Invalid Synthetic classfile attribute length %u in class file %s",
3545 attribute_length, CHECK);
3546 }
3547 parse_classfile_synthetic_attribute(CHECK);
3548 } else if (tag == vmSymbols::tag_deprecated()) {
3549 // Check for Deprecatd tag - 4276120
3550 if (attribute_length != 0) {
3551 classfile_parse_error(
3552 "Invalid Deprecated classfile attribute length %u in class file %s",
3553 attribute_length, CHECK);
3554 }
3555 } else if (_major_version >= JAVA_1_5_VERSION) {
3556 if (tag == vmSymbols::tag_signature()) {
3557 if (_generic_signature_index != 0) {
3558 classfile_parse_error(
3559 "Multiple Signature attributes in class file %s", CHECK);
3560 }
3561 if (attribute_length != 2) {
3562 classfile_parse_error(
3563 "Wrong Signature attribute length %u in class file %s",
3564 attribute_length, CHECK);
3565 }
3566 parse_classfile_signature_attribute(cfs, CHECK);
3567 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3568 if (runtime_visible_annotations != NULL) {
3569 classfile_parse_error(
3570 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3571 }
3572 runtime_visible_annotations_length = attribute_length;
3573 runtime_visible_annotations = cfs->current();
3574 assert(runtime_visible_annotations != NULL, "null visible annotations");
3575 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3576 parse_annotations(cp,
3577 runtime_visible_annotations,
3578 runtime_visible_annotations_length,
3579 parsed_annotations,
3580 _loader_data,
3581 CHECK);
3582 cfs->skip_u1_fast(runtime_visible_annotations_length);
3583 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3584 if (runtime_invisible_annotations_exists) {
3585 classfile_parse_error(
3586 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3587 }
3588 runtime_invisible_annotations_exists = true;
3589 if (PreserveAllAnnotations) {
3590 runtime_invisible_annotations_length = attribute_length;
3591 runtime_invisible_annotations = cfs->current();
3592 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3593 }
3594 cfs->skip_u1(attribute_length, CHECK);
3595 } else if (tag == vmSymbols::tag_enclosing_method()) {
3596 if (parsed_enclosingmethod_attribute) {
3597 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3598 } else {
3599 parsed_enclosingmethod_attribute = true;
3600 }
3601 guarantee_property(attribute_length == 4,
3602 "Wrong EnclosingMethod attribute length %u in class file %s",
3603 attribute_length, CHECK);
3604 cfs->guarantee_more(4, CHECK); // class_index, method_index
3605 enclosing_method_class_index = cfs->get_u2_fast();
3606 enclosing_method_method_index = cfs->get_u2_fast();
3607 if (enclosing_method_class_index == 0) {
3608 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3609 }
3610 // Validate the constant pool indices and types
3611 check_property(valid_klass_reference_at(enclosing_method_class_index),
3612 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3613 if (enclosing_method_method_index != 0 &&
3614 (!cp->is_within_bounds(enclosing_method_method_index) ||
3615 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3616 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3617 }
3618 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3619 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3620 if (parsed_bootstrap_methods_attribute) {
3621 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3622 }
3623 parsed_bootstrap_methods_attribute = true;
3624 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3625 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3626 if (runtime_visible_type_annotations != NULL) {
3627 classfile_parse_error(
3628 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3629 }
3630 runtime_visible_type_annotations_length = attribute_length;
3631 runtime_visible_type_annotations = cfs->current();
3632 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3633 // No need for the VM to parse Type annotations
3634 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3635 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3636 if (runtime_invisible_type_annotations_exists) {
3637 classfile_parse_error(
3638 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3639 } else {
3640 runtime_invisible_type_annotations_exists = true;
3641 }
3642 if (PreserveAllAnnotations) {
3643 runtime_invisible_type_annotations_length = attribute_length;
3644 runtime_invisible_type_annotations = cfs->current();
3645 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3646 }
3647 cfs->skip_u1(attribute_length, CHECK);
3648 } else if (_major_version >= JAVA_11_VERSION) {
3649 if (tag == vmSymbols::tag_nest_members()) {
3650 // Check for NestMembers tag
3651 if (parsed_nest_members_attribute) {
3652 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK);
3653 } else {
3654 parsed_nest_members_attribute = true;
3655 }
3656 if (parsed_nest_host_attribute) {
3657 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK);
3658 }
3659 nest_members_attribute_start = cfs->current();
3660 nest_members_attribute_length = attribute_length;
3661 cfs->skip_u1(nest_members_attribute_length, CHECK);
3662 } else if (tag == vmSymbols::tag_nest_host()) {
3663 if (parsed_nest_host_attribute) {
3664 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK);
3665 } else {
3666 parsed_nest_host_attribute = true;
3667 }
3668 if (parsed_nest_members_attribute) {
3669 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK);
3670 }
3671 if (_need_verify) {
3672 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3673 }
3674 cfs->guarantee_more(2, CHECK);
3675 u2 class_info_index = cfs->get_u2_fast();
3676 check_property(
3677 valid_klass_reference_at(class_info_index),
3678 "Nest-host class_info_index %u has bad constant type in class file %s",
3679 class_info_index, CHECK);
3680 _nest_host = class_info_index;
3681 } else {
3682 // Unknown attribute
3683 cfs->skip_u1(attribute_length, CHECK);
3684 }
3685 } else {
3686 // Unknown attribute
3687 cfs->skip_u1(attribute_length, CHECK);
3688 }
3689 } else {
3690 // Unknown attribute
3691 cfs->skip_u1(attribute_length, CHECK);
3692 }
3693 }
3694 _annotations = assemble_annotations(runtime_visible_annotations,
3695 runtime_visible_annotations_length,
3696 runtime_invisible_annotations,
3697 runtime_invisible_annotations_length,
3698 CHECK);
3699 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3700 runtime_visible_type_annotations_length,
3701 runtime_invisible_type_annotations,
3702 runtime_invisible_type_annotations_length,
3703 CHECK);
3704
3705 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3706 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3707 cfs,
3708 inner_classes_attribute_start,
3709 parsed_innerclasses_attribute,
3710 enclosing_method_class_index,
3711 enclosing_method_method_index,
3712 CHECK);
3713 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3714 guarantee_property(
3715 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3716 "Wrong InnerClasses attribute length in class file %s", CHECK);
3717 }
3718 }
3719
3720 if (parsed_nest_members_attribute) {
3721 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3722 cfs,
3723 nest_members_attribute_start,
3724 CHECK);
3725 if (_need_verify) {
3726 guarantee_property(
3727 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3728 "Wrong NestMembers attribute length in class file %s", CHECK);
3729 }
3730 }
3731
3732 if (parsed_value_types_attribute) {
3733 parse_value_types_attribute(cfs, value_types_attribute_start, CHECK);
3734 }
3735
3736 if (_max_bootstrap_specifier_index >= 0) {
3737 guarantee_property(parsed_bootstrap_methods_attribute,
3738 "Missing BootstrapMethods attribute in class file %s", CHECK);
3739 }
3740 }
3741
3742 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3743 assert(k != NULL, "invariant");
3744
3745 if (_synthetic_flag)
3746 k->set_is_synthetic();
3747 if (_sourcefile_index != 0) {
3748 k->set_source_file_name_index(_sourcefile_index);
3749 }
3750 if (_generic_signature_index != 0) {
3751 k->set_generic_signature_index(_generic_signature_index);
3752 }
3753 if (_sde_buffer != NULL) {
3754 k->set_source_debug_extension(_sde_buffer, _sde_length);
3755 }
3756 }
3757
3758 // Create the Annotations object that will
3759 // hold the annotations array for the Klass.
3760 void ClassFileParser::create_combined_annotations(TRAPS) {
3761 if (_annotations == NULL &&
3762 _type_annotations == NULL &&
3763 _fields_annotations == NULL &&
3764 _fields_type_annotations == NULL) {
3765 // Don't create the Annotations object unnecessarily.
3766 return;
3767 }
3768
3769 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3770 annotations->set_class_annotations(_annotations);
3771 annotations->set_class_type_annotations(_type_annotations);
3772 annotations->set_fields_annotations(_fields_annotations);
3773 annotations->set_fields_type_annotations(_fields_type_annotations);
3774
3775 // This is the Annotations object that will be
3776 // assigned to InstanceKlass being constructed.
3777 _combined_annotations = annotations;
3778
3779 // The annotations arrays below has been transfered the
3780 // _combined_annotations so these fields can now be cleared.
3781 _annotations = NULL;
3782 _type_annotations = NULL;
3783 _fields_annotations = NULL;
3784 _fields_type_annotations = NULL;
3785 }
3786
3787 // Transfer ownership of metadata allocated to the InstanceKlass.
3788 void ClassFileParser::apply_parsed_class_metadata(
3789 InstanceKlass* this_klass,
3790 int java_fields_count, TRAPS) {
3791 assert(this_klass != NULL, "invariant");
3792
3793 _cp->set_pool_holder(this_klass);
3794 this_klass->set_constants(_cp);
3795 this_klass->set_fields(_fields, java_fields_count);
3796 this_klass->set_methods(_methods);
3797 this_klass->set_inner_classes(_inner_classes);
3798 this_klass->set_nest_members(_nest_members);
3799 this_klass->set_nest_host_index(_nest_host);
3800 this_klass->set_value_types(_value_types);
3801 this_klass->set_local_interfaces(_local_interfaces);
3802 this_klass->set_annotations(_combined_annotations);
3803 // Delay the setting of _transitive_interfaces until after initialize_supers() in
3804 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with
3805 // its _super. If an OOM occurs while loading the current klass, its _super field
3806 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3807 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3808 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3809
3810 // Clear out these fields so they don't get deallocated by the destructor
3811 clear_class_metadata();
3812 }
3813
3814 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3815 int runtime_visible_annotations_length,
3816 const u1* const runtime_invisible_annotations,
3817 int runtime_invisible_annotations_length,
3818 TRAPS) {
3819 AnnotationArray* annotations = NULL;
3820 if (runtime_visible_annotations != NULL ||
3821 runtime_invisible_annotations != NULL) {
3822 annotations = MetadataFactory::new_array<u1>(_loader_data,
3823 runtime_visible_annotations_length +
3824 runtime_invisible_annotations_length,
3825 CHECK_(annotations));
3826 if (runtime_visible_annotations != NULL) {
3827 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3828 annotations->at_put(i, runtime_visible_annotations[i]);
3829 }
3830 }
3831 if (runtime_invisible_annotations != NULL) {
3832 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3833 int append = runtime_visible_annotations_length+i;
3834 annotations->at_put(append, runtime_invisible_annotations[i]);
3835 }
3836 }
3837 }
3838 return annotations;
3839 }
3840
3841 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3842 const int super_class_index,
3843 const bool need_verify,
3844 TRAPS) {
3845 assert(cp != NULL, "invariant");
3846 const InstanceKlass* super_klass = NULL;
3847
3848 if (super_class_index == 0) {
3849 check_property(_class_name == vmSymbols::java_lang_Object()
3850 || (_access_flags.get_flags() & JVM_ACC_VALUE),
3851 "Invalid superclass index %u in class file %s",
3852 super_class_index,
3853 CHECK_NULL);
3854 } else {
3855 check_property(valid_klass_reference_at(super_class_index),
3856 "Invalid superclass index %u in class file %s",
3857 super_class_index,
3858 CHECK_NULL);
3859 // The class name should be legal because it is checked when parsing constant pool.
3860 // However, make sure it is not an array type.
3861 bool is_array = false;
3862 if (cp->tag_at(super_class_index).is_klass()) {
3863 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3864 if (need_verify)
3865 is_array = super_klass->is_array_klass();
3866 } else if (need_verify) {
3867 is_array = (cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3868 }
3869 if (need_verify) {
3870 guarantee_property(!is_array,
3871 "Bad superclass name in class file %s", CHECK_NULL);
3872 }
3873 }
3874 return super_klass;
3875 }
3876
3877 #ifndef PRODUCT
3878 static void print_field_layout(const Symbol* name,
3879 Array<u2>* fields,
3880 const constantPoolHandle& cp,
3881 int instance_size,
3882 int instance_fields_start,
3883 int instance_fields_end,
3884 int static_fields_end) {
3885
3886 assert(name != NULL, "invariant");
3887
3888 tty->print("%s: field layout\n", name->as_klass_external_name());
3889 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3890 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3891 if (!fs.access_flags().is_static()) {
3892 tty->print(" @%3d \"%s\" %s\n",
3893 fs.offset(),
3894 fs.name()->as_klass_external_name(),
3895 fs.signature()->as_klass_external_name());
3896 }
3897 }
3898 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3899 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3900 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3901 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3902 if (fs.access_flags().is_static()) {
3903 tty->print(" @%3d \"%s\" %s\n",
3904 fs.offset(),
3905 fs.name()->as_klass_external_name(),
3906 fs.signature()->as_klass_external_name());
3907 }
3908 }
3909 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3910 tty->print("\n");
3911 }
3912 #endif
3913
3914 // Values needed for oopmap and InstanceKlass creation
3915 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3916 public:
3917 OopMapBlocksBuilder* oop_map_blocks;
3918 int instance_size;
3919 int nonstatic_field_size;
3920 int static_field_size;
3921 bool has_nonstatic_fields;
3922 };
3923
3924 // Utility to collect and compact oop maps during layout
3925 class ClassFileParser::OopMapBlocksBuilder : public ResourceObj {
3926 public:
3927 OopMapBlock* nonstatic_oop_maps;
3928 unsigned int nonstatic_oop_map_count;
3929 unsigned int max_nonstatic_oop_maps;
3930
3931 public:
3932 OopMapBlocksBuilder(unsigned int max_blocks, TRAPS) {
3933 max_nonstatic_oop_maps = max_blocks;
3934 nonstatic_oop_map_count = 0;
3935 if (max_blocks == 0) {
3936 nonstatic_oop_maps = NULL;
3937 } else {
3938 nonstatic_oop_maps = NEW_RESOURCE_ARRAY_IN_THREAD(
3939 THREAD, OopMapBlock, max_nonstatic_oop_maps);
3940 memset(nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3941 }
3942 }
3943
3944 OopMapBlock* last_oop_map() const {
3945 assert(nonstatic_oop_map_count > 0, "Has no oop maps");
3946 return nonstatic_oop_maps + (nonstatic_oop_map_count - 1);
3947 }
3948
3949 // addition of super oop maps
3950 void initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3951 assert(nof_blocks && nonstatic_oop_map_count == 0 &&
3952 nof_blocks <= max_nonstatic_oop_maps, "invariant");
3953
3954 memcpy(nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3955 nonstatic_oop_map_count += nof_blocks;
3956 }
3957
3958 // collection of oops
3959 void add(int offset, int count) {
3960 if (nonstatic_oop_map_count == 0) {
3961 nonstatic_oop_map_count++;
3962 }
3963 OopMapBlock* nonstatic_oop_map = last_oop_map();
3964 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
3965 nonstatic_oop_map->set_offset(offset);
3966 nonstatic_oop_map->set_count(count);
3967 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
3968 nonstatic_oop_map->increment_count(count);
3969 } else { // Need a new one...
3970 nonstatic_oop_map_count++;
3971 assert(nonstatic_oop_map_count <= max_nonstatic_oop_maps, "range check");
3972 nonstatic_oop_map = last_oop_map();
3973 nonstatic_oop_map->set_offset(offset);
3974 nonstatic_oop_map->set_count(count);
3975 }
3976 }
3977
3978 // general purpose copy, e.g. into allocated instanceKlass
3979 void copy(OopMapBlock* dst) {
3980 if (nonstatic_oop_map_count != 0) {
3981 memcpy(dst, nonstatic_oop_maps, sizeof(OopMapBlock) * nonstatic_oop_map_count);
3982 }
3983 }
3984
3985 // Sort and compact adjacent blocks
3986 void compact(TRAPS) {
3987 if (nonstatic_oop_map_count <= 1) {
3988 return;
3989 }
3990 /*
3991 * Since field layout sneeks in oops before values, we will be able to condense
3992 * blocks. There is potential to compact between super, own refs and values
3993 * containing refs.
3994 *
3995 * Currently compaction is slightly limited due to values being 8 byte aligned.
3996 * This may well change: FixMe if doesn't, the code below is fairly general purpose
3997 * and maybe it doesn't need to be.
3998 */
3999 qsort(nonstatic_oop_maps, nonstatic_oop_map_count, sizeof(OopMapBlock),
4000 (_sort_Fn)OopMapBlock::compare_offset);
4001 if (nonstatic_oop_map_count < 2) {
4002 return;
4003 }
4004
4005 //Make a temp copy, and iterate through and copy back into the orig
4006 ResourceMark rm(THREAD);
4007 OopMapBlock* oop_maps_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, OopMapBlock,
4008 nonstatic_oop_map_count);
4009 OopMapBlock* oop_maps_copy_end = oop_maps_copy + nonstatic_oop_map_count;
4010 copy(oop_maps_copy);
4011 OopMapBlock* nonstatic_oop_map = nonstatic_oop_maps;
4012 unsigned int new_count = 1;
4013 oop_maps_copy++;
4014 while(oop_maps_copy < oop_maps_copy_end) {
4015 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4016 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4017 nonstatic_oop_map->increment_count(oop_maps_copy->count());
4018 } else {
4019 nonstatic_oop_map++;
4020 new_count++;
4021 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4022 nonstatic_oop_map->set_count(oop_maps_copy->count());
4023 }
4024 oop_maps_copy++;
4025 }
4026 assert(new_count <= nonstatic_oop_map_count, "end up with more maps after compact() ?");
4027 nonstatic_oop_map_count = new_count;
4028 }
4029
4030 void print_on(outputStream* st) const {
4031 st->print_cr(" OopMapBlocks: %3d /%3d", nonstatic_oop_map_count, max_nonstatic_oop_maps);
4032 if (nonstatic_oop_map_count > 0) {
4033 OopMapBlock* map = nonstatic_oop_maps;
4034 OopMapBlock* last_map = last_oop_map();
4035 assert(map <= last_map, "Last less than first");
4036 while (map <= last_map) {
4037 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4038 map->offset() + map->offset_span() - heapOopSize, map->count());
4039 map++;
4040 }
4041 }
4042 }
4043
4044 void print_value_on(outputStream* st) const {
4045 print_on(st);
4046 }
4047
4048 };
4049
4050 void ClassFileParser::throwValueTypeLimitation(THREAD_AND_LOCATION_DECL,
4051 const char* msg,
4052 const Symbol* name,
4053 const Symbol* sig) const {
4054
4055 ResourceMark rm(THREAD);
4056 if (name == NULL || sig == NULL) {
4057 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
4058 vmSymbols::java_lang_ClassFormatError(),
4059 "class: %s - %s", _class_name->as_C_string(), msg);
4060 }
4061 else {
4062 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
4063 vmSymbols::java_lang_ClassFormatError(),
4064 "\"%s\" sig: \"%s\" class: %s - %s", name->as_C_string(), sig->as_C_string(),
4065 _class_name->as_C_string(), msg);
4066 }
4067 }
4068
4069 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
4070 void ClassFileParser::layout_fields(ConstantPool* cp,
4071 const FieldAllocationCount* fac,
4072 const ClassAnnotationCollector* parsed_annotations,
4073 FieldLayoutInfo* info,
4074 TRAPS) {
4075
4076 assert(cp != NULL, "invariant");
4077
4078 // Field size and offset computation
4079 int nonstatic_field_size = _super_klass == NULL ? 0 :
4080 _super_klass->nonstatic_field_size();
4081 int next_nonstatic_valuetype_offset = 0;
4082 int first_nonstatic_valuetype_offset = 0;
4083
4084 // Fields that are value types are handled differently depending if they are static or not:
4085 // - static fields are oops
4086 // - non-static fields are embedded
4087
4088 // Count the contended fields by type.
4089 //
4090 // We ignore static fields, because @Contended is not supported for them.
4091 // The layout code below will also ignore the static fields.
4092 int nonstatic_contended_count = 0;
4093 FieldAllocationCount fac_contended;
4094 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4095 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4096 if (fs.is_contended()) {
4097 fac_contended.count[atype]++;
4098 if (!fs.access_flags().is_static()) {
4099 nonstatic_contended_count++;
4100 }
4101 }
4102 }
4103
4104
4105 // Calculate the starting byte offsets
4106 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
4107 // Value types in static fields are not embedded, they are handled with oops
4108 int next_static_double_offset = next_static_oop_offset +
4109 ((fac->count[STATIC_OOP] + fac->count[STATIC_FLATTENABLE]) * heapOopSize);
4110 if (fac->count[STATIC_DOUBLE]) {
4111 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
4112 }
4113
4114 int next_static_word_offset = next_static_double_offset +
4115 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
4116 int next_static_short_offset = next_static_word_offset +
4117 ((fac->count[STATIC_WORD]) * BytesPerInt);
4118 int next_static_byte_offset = next_static_short_offset +
4119 ((fac->count[STATIC_SHORT]) * BytesPerShort);
4120
4121 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
4122 nonstatic_field_size * heapOopSize;
4123
4124 // First field of value types is aligned on a long boundary in order to ease
4125 // in-lining of value types (with header removal) in packed arrays and
4126 // flatten value types
4127 int initial_value_type_padding = 0;
4128 if (is_value_type()) {
4129 int old = nonstatic_fields_start;
4130 nonstatic_fields_start = align_up(nonstatic_fields_start, BytesPerLong);
4131 initial_value_type_padding = nonstatic_fields_start - old;
4132 }
4133
4134 int next_nonstatic_field_offset = nonstatic_fields_start;
4135
4136 const bool is_contended_class = parsed_annotations->is_contended();
4137
4138 // Class is contended, pad before all the fields
4139 if (is_contended_class) {
4140 next_nonstatic_field_offset += ContendedPaddingWidth;
4141 }
4142
4143 // Temporary value types restrictions
4144 if (is_value_type()) {
4145 if (is_contended_class) {
4146 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support @Contended annotation yet");
4147 return;
4148 }
4149 }
4150
4151 // Compute the non-contended fields count.
4152 // The packing code below relies on these counts to determine if some field
4153 // can be squeezed into the alignment gap. Contended fields are obviously
4154 // exempt from that.
4155 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
4156 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
4157 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
4158 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
4159 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
4160
4161 int static_value_type_count = 0;
4162 int nonstatic_value_type_count = 0;
4163 int* nonstatic_value_type_indexes = NULL;
4164 Klass** nonstatic_value_type_klasses = NULL;
4165 unsigned int value_type_oop_map_count = 0;
4166 int not_flattened_value_types = 0;
4167
4168 int max_nonstatic_value_type = fac->count[NONSTATIC_FLATTENABLE] + 1;
4169
4170 nonstatic_value_type_indexes = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, int,
4171 max_nonstatic_value_type);
4172 for (int i = 0; i < max_nonstatic_value_type; i++) {
4173 nonstatic_value_type_indexes[i] = -1;
4174 }
4175 nonstatic_value_type_klasses = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, Klass*,
4176 max_nonstatic_value_type);
4177
4178 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
4179 if (fs.allocation_type() == STATIC_FLATTENABLE) {
4180 // Pre-resolve the flattenable field and check for value type circularity
4181 // issues. Note that super-class circularity checks are not needed here
4182 // because flattenable fields can only be in value types and value types
4183 // only have java.lang.Object as their super class.
4184 // Also, note that super-interface circularity checks are not needed
4185 // because interfaces cannot be value types.
4186 ResourceMark rm;
4187 Symbol* sig = fs.signature();
4188 Symbol* name = SymbolTable::lookup(sig->as_C_string() + 1,
4189 sig->utf8_length() - 2, CHECK);
4190 if (!InstanceKlass::is_declared_value_type(_cp, _value_types, name)) {
4191 name->decrement_refcount();
4192 THROW(vmSymbols::java_lang_ClassFormatError());
4193 }
4194 name->decrement_refcount();
4195 Klass* klass =
4196 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4197 Handle(THREAD, _loader_data->class_loader()),
4198 _protection_domain, true, CHECK);
4199 assert(klass != NULL, "Sanity check");
4200 if (!klass->access_flags().is_value_type()) {
4201 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4202 }
4203 static_value_type_count++;
4204 } else if (fs.allocation_type() == NONSTATIC_FLATTENABLE) {
4205 // Pre-resolve the flattenable field and check for value type circularity issues.
4206 ResourceMark rm;
4207 Symbol* sig = fs.signature();
4208 Symbol* name = SymbolTable::lookup(sig->as_C_string() + 1,
4209 sig->utf8_length() - 2, CHECK);
4210 if (!InstanceKlass::is_declared_value_type(_cp, _value_types, name)) {
4211 name->decrement_refcount();
4212 THROW(vmSymbols::java_lang_ClassFormatError());
4213 }
4214 name->decrement_refcount();
4215 Klass* klass =
4216 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4217 Handle(THREAD, _loader_data->class_loader()),
4218 _protection_domain, true, CHECK);
4219 assert(klass != NULL, "Sanity check");
4220 if (!klass->access_flags().is_value_type()) {
4221 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4222 }
4223 ValueKlass* vk = ValueKlass::cast(klass);
4224 // Conditions to apply flattening or not should be defined in a single place
4225 if ((ValueFieldMaxFlatSize < 0) || (vk->size_helper() * HeapWordSize) <= ValueFieldMaxFlatSize) {
4226 nonstatic_value_type_indexes[nonstatic_value_type_count] = fs.index();
4227 nonstatic_value_type_klasses[nonstatic_value_type_count] = klass;
4228 nonstatic_value_type_count++;
4229
4230 ValueKlass* vklass = ValueKlass::cast(klass);
4231 if (vklass->contains_oops()) {
4232 value_type_oop_map_count += vklass->nonstatic_oop_map_count();
4233 }
4234 fs.set_flattened(true);
4235 } else {
4236 not_flattened_value_types++;
4237 fs.set_flattened(false);
4238 }
4239 }
4240 }
4241
4242 // Adjusting non_static_oop_count to take into account not flattened value types;
4243 nonstatic_oop_count += not_flattened_value_types;
4244
4245 // Total non-static fields count, including every contended field
4246 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
4247 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
4248 fac->count[NONSTATIC_OOP] + fac->count[NONSTATIC_FLATTENABLE];
4249
4250 const bool super_has_nonstatic_fields =
4251 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
4252 const bool has_nonstatic_fields =
4253 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
4254 const bool has_nonstatic_value_fields = nonstatic_value_type_count > 0;
4255
4256 if (is_value_type() && (!has_nonstatic_fields)) {
4257 // There are a number of fixes required throughout the type system and JIT
4258 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support zero instance size yet");
4259 return;
4260 }
4261
4262 // Prepare list of oops for oop map generation.
4263 //
4264 // "offset" and "count" lists are describing the set of contiguous oop
4265 // regions. offset[i] is the start of the i-th region, which then has
4266 // count[i] oops following. Before we know how many regions are required,
4267 // we pessimistically allocate the maps to fit all the oops into the
4268 // distinct regions.
4269 //
4270 int super_oop_map_count = (_super_klass == NULL) ? 0 :_super_klass->nonstatic_oop_map_count();
4271 int max_oop_map_count =
4272 super_oop_map_count +
4273 fac->count[NONSTATIC_OOP] +
4274 value_type_oop_map_count +
4275 not_flattened_value_types;
4276
4277 OopMapBlocksBuilder* nonstatic_oop_maps = new OopMapBlocksBuilder(max_oop_map_count, THREAD);
4278 if (super_oop_map_count > 0) {
4279 nonstatic_oop_maps->initialize_inherited_blocks(_super_klass->start_of_nonstatic_oop_maps(),
4280 _super_klass->nonstatic_oop_map_count());
4281 }
4282
4283 int first_nonstatic_oop_offset = 0; // will be set for first oop field
4284
4285 bool compact_fields = CompactFields;
4286 int allocation_style = FieldsAllocationStyle;
4287 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
4288 assert(false, "0 <= FieldsAllocationStyle <= 2");
4289 allocation_style = 1; // Optimistic
4290 }
4291
4292 // The next classes have predefined hard-coded fields offsets
4293 // (see in JavaClasses::compute_hard_coded_offsets()).
4294 // Use default fields allocation order for them.
4295 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
4296 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
4297 _class_name == vmSymbols::java_lang_Class() ||
4298 _class_name == vmSymbols::java_lang_ClassLoader() ||
4299 _class_name == vmSymbols::java_lang_ref_Reference() ||
4300 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
4301 _class_name == vmSymbols::java_lang_StackTraceElement() ||
4302 _class_name == vmSymbols::java_lang_String() ||
4303 _class_name == vmSymbols::java_lang_Throwable() ||
4304 _class_name == vmSymbols::java_lang_Boolean() ||
4305 _class_name == vmSymbols::java_lang_Character() ||
4306 _class_name == vmSymbols::java_lang_Float() ||
4307 _class_name == vmSymbols::java_lang_Double() ||
4308 _class_name == vmSymbols::java_lang_Byte() ||
4309 _class_name == vmSymbols::java_lang_Short() ||
4310 _class_name == vmSymbols::java_lang_Integer() ||
4311 _class_name == vmSymbols::java_lang_Long())) {
4312 allocation_style = 0; // Allocate oops first
4313 compact_fields = false; // Don't compact fields
4314 }
4315
4316 int next_nonstatic_oop_offset = 0;
4317 int next_nonstatic_double_offset = 0;
4318
4319 // Rearrange fields for a given allocation style
4320 if( allocation_style == 0 ) {
4321 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
4322 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4323 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4324 (nonstatic_oop_count * heapOopSize);
4325 } else if( allocation_style == 1 ) {
4326 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
4327 next_nonstatic_double_offset = next_nonstatic_field_offset;
4328 } else if( allocation_style == 2 ) {
4329 // Fields allocation: oops fields in super and sub classes are together.
4330 if( nonstatic_field_size > 0 && super_oop_map_count > 0 ) {
4331 if (next_nonstatic_field_offset == nonstatic_oop_maps->last_oop_map()->end_offset()) {
4332 allocation_style = 0; // allocate oops first
4333 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4334 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4335 (nonstatic_oop_count * heapOopSize);
4336 }
4337 }
4338 if( allocation_style == 2 ) {
4339 allocation_style = 1; // allocate oops last
4340 next_nonstatic_double_offset = next_nonstatic_field_offset;
4341 }
4342 } else {
4343 ShouldNotReachHere();
4344 }
4345
4346 int nonstatic_oop_space_count = 0;
4347 int nonstatic_word_space_count = 0;
4348 int nonstatic_short_space_count = 0;
4349 int nonstatic_byte_space_count = 0;
4350 int nonstatic_oop_space_offset = 0;
4351 int nonstatic_word_space_offset = 0;
4352 int nonstatic_short_space_offset = 0;
4353 int nonstatic_byte_space_offset = 0;
4354
4355 // Try to squeeze some of the fields into the gaps due to
4356 // long/double alignment.
4357 if (nonstatic_double_count > 0) {
4358 int offset = next_nonstatic_double_offset;
4359 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
4360 if (compact_fields && offset != next_nonstatic_double_offset) {
4361 // Allocate available fields into the gap before double field.
4362 int length = next_nonstatic_double_offset - offset;
4363 assert(length == BytesPerInt, "");
4364 nonstatic_word_space_offset = offset;
4365 if (nonstatic_word_count > 0) {
4366 nonstatic_word_count -= 1;
4367 nonstatic_word_space_count = 1; // Only one will fit
4368 length -= BytesPerInt;
4369 offset += BytesPerInt;
4370 }
4371 nonstatic_short_space_offset = offset;
4372 while (length >= BytesPerShort && nonstatic_short_count > 0) {
4373 nonstatic_short_count -= 1;
4374 nonstatic_short_space_count += 1;
4375 length -= BytesPerShort;
4376 offset += BytesPerShort;
4377 }
4378 nonstatic_byte_space_offset = offset;
4379 while (length > 0 && nonstatic_byte_count > 0) {
4380 nonstatic_byte_count -= 1;
4381 nonstatic_byte_space_count += 1;
4382 length -= 1;
4383 }
4384 // Allocate oop field in the gap if there are no other fields for that.
4385 nonstatic_oop_space_offset = offset;
4386 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
4387 allocation_style != 0) { // when oop fields not first
4388 nonstatic_oop_count -= 1;
4389 nonstatic_oop_space_count = 1; // Only one will fit
4390 length -= heapOopSize;
4391 offset += heapOopSize;
4392 }
4393 }
4394 }
4395
4396 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4397 (nonstatic_double_count * BytesPerLong);
4398 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4399 (nonstatic_word_count * BytesPerInt);
4400 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4401 (nonstatic_short_count * BytesPerShort);
4402 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4403 nonstatic_byte_count;
4404
4405 // let oops jump before padding with this allocation style
4406 if( allocation_style == 1 ) {
4407 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4408 if( nonstatic_oop_count > 0 ) {
4409 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4410 }
4411 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4412 }
4413
4414 // Aligning embedded value types
4415 // bug below, the current algorithm to layout embedded value types always put them at the
4416 // end of the layout, which doesn't match the different allocation policies the VM is
4417 // supposed to provide => FixMe
4418 // Note also that the current alignment policy is to make each value type starting on a
4419 // 64 bits boundary. This could be optimized later. For instance, it could be nice to
4420 // align value types according to their most constrained internal type.
4421 next_nonstatic_valuetype_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4422 int next_value_type_index = 0;
4423
4424 // Iterate over fields again and compute correct offsets.
4425 // The field allocation type was temporarily stored in the offset slot.
4426 // oop fields are located before non-oop fields (static and non-static).
4427 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4428
4429 // skip already laid out fields
4430 if (fs.is_offset_set()) continue;
4431
4432 // contended instance fields are handled below
4433 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4434
4435 int real_offset = 0;
4436 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4437
4438 // pack the rest of the fields
4439 switch (atype) {
4440 // Value types in static fields are handled with oops
4441 case STATIC_FLATTENABLE: // Fallthrough
4442 case STATIC_OOP:
4443 real_offset = next_static_oop_offset;
4444 next_static_oop_offset += heapOopSize;
4445 break;
4446 case STATIC_BYTE:
4447 real_offset = next_static_byte_offset;
4448 next_static_byte_offset += 1;
4449 break;
4450 case STATIC_SHORT:
4451 real_offset = next_static_short_offset;
4452 next_static_short_offset += BytesPerShort;
4453 break;
4454 case STATIC_WORD:
4455 real_offset = next_static_word_offset;
4456 next_static_word_offset += BytesPerInt;
4457 break;
4458 case STATIC_DOUBLE:
4459 real_offset = next_static_double_offset;
4460 next_static_double_offset += BytesPerLong;
4461 break;
4462 case NONSTATIC_FLATTENABLE:
4463 if (fs.is_flattened()) {
4464 Klass* klass = nonstatic_value_type_klasses[next_value_type_index];
4465 assert(klass != NULL, "Klass should have been loaded and resolved earlier");
4466 assert(klass->access_flags().is_value_type(),"Must be a value type");
4467 ValueKlass* vklass = ValueKlass::cast(klass);
4468 real_offset = next_nonstatic_valuetype_offset;
4469 next_nonstatic_valuetype_offset += (vklass->size_helper()) * wordSize - vklass->first_field_offset();
4470 // aligning next value type on a 64 bits boundary
4471 next_nonstatic_valuetype_offset = align_up(next_nonstatic_valuetype_offset, BytesPerLong);
4472 next_value_type_index += 1;
4473
4474 if (vklass->contains_oops()) { // add flatten oop maps
4475 int diff = real_offset - vklass->first_field_offset();
4476 const OopMapBlock* map = vklass->start_of_nonstatic_oop_maps();
4477 const OopMapBlock* const last_map = map + vklass->nonstatic_oop_map_count();
4478 while (map < last_map) {
4479 nonstatic_oop_maps->add(map->offset() + diff, map->count());
4480 map++;
4481 }
4482 }
4483 break;
4484 } else {
4485 // Fall through
4486 }
4487 case NONSTATIC_OOP:
4488 if( nonstatic_oop_space_count > 0 ) {
4489 real_offset = nonstatic_oop_space_offset;
4490 nonstatic_oop_space_offset += heapOopSize;
4491 nonstatic_oop_space_count -= 1;
4492 } else {
4493 real_offset = next_nonstatic_oop_offset;
4494 next_nonstatic_oop_offset += heapOopSize;
4495 }
4496 nonstatic_oop_maps->add(real_offset, 1);
4497 break;
4498 case NONSTATIC_BYTE:
4499 if( nonstatic_byte_space_count > 0 ) {
4500 real_offset = nonstatic_byte_space_offset;
4501 nonstatic_byte_space_offset += 1;
4502 nonstatic_byte_space_count -= 1;
4503 } else {
4504 real_offset = next_nonstatic_byte_offset;
4505 next_nonstatic_byte_offset += 1;
4506 }
4507 break;
4508 case NONSTATIC_SHORT:
4509 if( nonstatic_short_space_count > 0 ) {
4510 real_offset = nonstatic_short_space_offset;
4511 nonstatic_short_space_offset += BytesPerShort;
4512 nonstatic_short_space_count -= 1;
4513 } else {
4514 real_offset = next_nonstatic_short_offset;
4515 next_nonstatic_short_offset += BytesPerShort;
4516 }
4517 break;
4518 case NONSTATIC_WORD:
4519 if( nonstatic_word_space_count > 0 ) {
4520 real_offset = nonstatic_word_space_offset;
4521 nonstatic_word_space_offset += BytesPerInt;
4522 nonstatic_word_space_count -= 1;
4523 } else {
4524 real_offset = next_nonstatic_word_offset;
4525 next_nonstatic_word_offset += BytesPerInt;
4526 }
4527 break;
4528 case NONSTATIC_DOUBLE:
4529 real_offset = next_nonstatic_double_offset;
4530 next_nonstatic_double_offset += BytesPerLong;
4531 break;
4532 default:
4533 ShouldNotReachHere();
4534 }
4535 fs.set_offset(real_offset);
4536 }
4537
4538
4539 // Handle the contended cases.
4540 //
4541 // Each contended field should not intersect the cache line with another contended field.
4542 // In the absence of alignment information, we end up with pessimistically separating
4543 // the fields with full-width padding.
4544 //
4545 // Additionally, this should not break alignment for the fields, so we round the alignment up
4546 // for each field.
4547 if (nonstatic_contended_count > 0) {
4548
4549 // if there is at least one contended field, we need to have pre-padding for them
4550 next_nonstatic_padded_offset += ContendedPaddingWidth;
4551
4552 // collect all contended groups
4553 ResourceBitMap bm(cp->size());
4554 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4555 // skip already laid out fields
4556 if (fs.is_offset_set()) continue;
4557
4558 if (fs.is_contended()) {
4559 bm.set_bit(fs.contended_group());
4560 }
4561 }
4562
4563 int current_group = -1;
4564 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4565
4566 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4567
4568 // skip already laid out fields
4569 if (fs.is_offset_set()) continue;
4570
4571 // skip non-contended fields and fields from different group
4572 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4573
4574 // handle statics below
4575 if (fs.access_flags().is_static()) continue;
4576
4577 int real_offset = 0;
4578 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4579
4580 switch (atype) {
4581 case NONSTATIC_BYTE:
4582 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4583 real_offset = next_nonstatic_padded_offset;
4584 next_nonstatic_padded_offset += 1;
4585 break;
4586
4587 case NONSTATIC_SHORT:
4588 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4589 real_offset = next_nonstatic_padded_offset;
4590 next_nonstatic_padded_offset += BytesPerShort;
4591 break;
4592
4593 case NONSTATIC_WORD:
4594 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4595 real_offset = next_nonstatic_padded_offset;
4596 next_nonstatic_padded_offset += BytesPerInt;
4597 break;
4598
4599 case NONSTATIC_DOUBLE:
4600 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4601 real_offset = next_nonstatic_padded_offset;
4602 next_nonstatic_padded_offset += BytesPerLong;
4603 break;
4604
4605 // Value types in static fields are handled with oops
4606 case NONSTATIC_FLATTENABLE:
4607 throwValueTypeLimitation(THREAD_AND_LOCATION,
4608 "@Contended annotation not supported for value types yet", fs.name(), fs.signature());
4609 return;
4610
4611 case NONSTATIC_OOP:
4612 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4613 real_offset = next_nonstatic_padded_offset;
4614 next_nonstatic_padded_offset += heapOopSize;
4615 nonstatic_oop_maps->add(real_offset, 1);
4616 break;
4617
4618 default:
4619 ShouldNotReachHere();
4620 }
4621
4622 if (fs.contended_group() == 0) {
4623 // Contended group defines the equivalence class over the fields:
4624 // the fields within the same contended group are not inter-padded.
4625 // The only exception is default group, which does not incur the
4626 // equivalence, and so requires intra-padding.
4627 next_nonstatic_padded_offset += ContendedPaddingWidth;
4628 }
4629
4630 fs.set_offset(real_offset);
4631 } // for
4632
4633 // Start laying out the next group.
4634 // Note that this will effectively pad the last group in the back;
4635 // this is expected to alleviate memory contention effects for
4636 // subclass fields and/or adjacent object.
4637 // If this was the default group, the padding is already in place.
4638 if (current_group != 0) {
4639 next_nonstatic_padded_offset += ContendedPaddingWidth;
4640 }
4641 }
4642
4643 // handle static fields
4644 }
4645
4646 // Entire class is contended, pad in the back.
4647 // This helps to alleviate memory contention effects for subclass fields
4648 // and/or adjacent object.
4649 if (is_contended_class) {
4650 assert(!is_value_type(), "@Contended not supported for value types yet");
4651 next_nonstatic_padded_offset += ContendedPaddingWidth;
4652 }
4653
4654 int notaligned_nonstatic_fields_end;
4655 if (nonstatic_value_type_count != 0) {
4656 notaligned_nonstatic_fields_end = next_nonstatic_valuetype_offset;
4657 } else {
4658 notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4659 }
4660
4661 int nonstatic_field_sz_align = heapOopSize;
4662 if (is_value_type()) {
4663 if ((notaligned_nonstatic_fields_end - nonstatic_fields_start) > heapOopSize) {
4664 nonstatic_field_sz_align = BytesPerLong; // value copy of fields only uses jlong copy
4665 }
4666 }
4667 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, nonstatic_field_sz_align);
4668 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4669 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4670
4671 int static_field_size = (static_fields_end -
4672 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4673 nonstatic_field_size = nonstatic_field_size +
4674 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4675
4676 int instance_size = align_object_size(instance_end / wordSize);
4677
4678 assert(instance_size == align_object_size(align_up(
4679 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize)
4680 + initial_value_type_padding, wordSize) / wordSize), "consistent layout helper value");
4681
4682
4683 // Invariant: nonstatic_field end/start should only change if there are
4684 // nonstatic fields in the class, or if the class is contended. We compare
4685 // against the non-aligned value, so that end alignment will not fail the
4686 // assert without actually having the fields.
4687 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4688 is_contended_class ||
4689 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4690
4691 // Number of non-static oop map blocks allocated at end of klass.
4692 nonstatic_oop_maps->compact(THREAD);
4693
4694 #ifndef PRODUCT
4695 if ((PrintFieldLayout && !is_value_type()) ||
4696 (PrintValueLayout && (is_value_type() || has_nonstatic_value_fields))) {
4697 print_field_layout(_class_name,
4698 _fields,
4699 cp,
4700 instance_size,
4701 nonstatic_fields_start,
4702 nonstatic_fields_end,
4703 static_fields_end);
4704 nonstatic_oop_maps->print_on(tty);
4705 tty->print("\n");
4706 }
4707
4708 #endif
4709 // Pass back information needed for InstanceKlass creation
4710 info->oop_map_blocks = nonstatic_oop_maps;
4711 info->instance_size = instance_size;
4712 info->static_field_size = static_field_size;
4713 info->nonstatic_field_size = nonstatic_field_size;
4714 info->has_nonstatic_fields = has_nonstatic_fields;
4715 }
4716
4717 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik, TRAPS) {
4718 assert(ik != NULL, "invariant");
4719
4720 const Klass* const super = ik->super();
4721
4722 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4723 // in which case we don't have to register objects as finalizable
4724 if (!_has_empty_finalizer) {
4725 if (_has_finalizer ||
4726 (super != NULL && super->has_finalizer())) {
4727 ik->set_has_finalizer();
4728 }
4729 }
4730
4731 #ifdef ASSERT
4732 bool f = false;
4733 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4734 vmSymbols::void_method_signature());
4735 if (m != NULL && !m->is_empty_method()) {
4736 f = true;
4737 }
4738
4739 // Spec doesn't prevent agent from redefinition of empty finalizer.
4740 // Despite the fact that it's generally bad idea and redefined finalizer
4741 // will not work as expected we shouldn't abort vm in this case
4742 if (!ik->has_redefined_this_or_super()) {
4743 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4744 }
4745 #endif
4746
4747 // Check if this klass supports the java.lang.Cloneable interface
4748 if (SystemDictionary::Cloneable_klass_loaded()) {
4749 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4750 if (ik->is_value()) {
4751 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support Cloneable");
4752 return;
4753 }
4754 ik->set_is_cloneable();
4755 }
4756 }
4757
4758 // Check if this klass has a vanilla default constructor
4759 if (super == NULL) {
4760 // java.lang.Object has empty default constructor
4761 ik->set_has_vanilla_constructor();
4762 } else {
4763 if (super->has_vanilla_constructor() &&
4764 _has_vanilla_constructor) {
4765 ik->set_has_vanilla_constructor();
4766 }
4767 #ifdef ASSERT
4768 bool v = false;
4769 if (super->has_vanilla_constructor()) {
4770 const Method* const constructor =
4771 ik->find_method(vmSymbols::object_initializer_name(),
4772 vmSymbols::void_method_signature());
4773 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4774 v = true;
4775 }
4776 }
4777 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4778 #endif
4779 }
4780
4781 // If it cannot be fast-path allocated, set a bit in the layout helper.
4782 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4783 assert(ik->size_helper() > 0, "layout_helper is initialized");
4784 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4785 || ik->is_abstract() || ik->is_interface()
4786 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4787 || ik->size_helper() >= FastAllocateSizeLimit) {
4788 // Forbid fast-path allocation.
4789 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4790 ik->set_layout_helper(lh);
4791 }
4792 }
4793
4794 bool ClassFileParser::supports_value_types() const {
4795 // Value types are only supported by class file version 55 and later
4796 return _major_version >= JAVA_11_VERSION;
4797 }
4798
4799 // Attach super classes and interface classes to class loader data
4800 static void record_defined_class_dependencies(const InstanceKlass* defined_klass,
4801 TRAPS) {
4802 assert(defined_klass != NULL, "invariant");
4803
4804 ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data();
4805 if (defining_loader_data->is_the_null_class_loader_data()) {
4806 // Dependencies to null class loader data are implicit.
4807 return;
4808 } else {
4809 // add super class dependency
4810 Klass* const super = defined_klass->super();
4811 if (super != NULL) {
4812 defining_loader_data->record_dependency(super);
4813 }
4814
4815 // add super interface dependencies
4816 const Array<InstanceKlass*>* const local_interfaces = defined_klass->local_interfaces();
4817 if (local_interfaces != NULL) {
4818 const int length = local_interfaces->length();
4819 for (int i = 0; i < length; i++) {
4820 defining_loader_data->record_dependency(local_interfaces->at(i));
4821 }
4822 }
4823
4824 for(int i = 0; i < defined_klass->java_fields_count(); i++) {
4825 if ((defined_klass->field_access_flags(i) & JVM_ACC_FLATTENABLE) != 0) {
4826 const Klass* klass = defined_klass->get_value_field_klass(i);
4827 defining_loader_data->record_dependency(klass);
4828 }
4829 }
4830 }
4831 }
4832
4833 // utility methods for appending an array with check for duplicates
4834
4835 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4836 const Array<InstanceKlass*>* const ifs) {
4837 // iterate over new interfaces
4838 for (int i = 0; i < ifs->length(); i++) {
4839 InstanceKlass* const e = ifs->at(i);
4840 assert(e->is_klass() && e->is_interface(), "just checking");
4841 // add new interface
4842 result->append_if_missing(e);
4843 }
4844 }
4845
4846 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4847 Array<InstanceKlass*>* local_ifs,
4848 ClassLoaderData* loader_data,
4849 TRAPS) {
4850 assert(local_ifs != NULL, "invariant");
4851 assert(loader_data != NULL, "invariant");
4852
4853 // Compute maximum size for transitive interfaces
4854 int max_transitive_size = 0;
4855 int super_size = 0;
4856 // Add superclass transitive interfaces size
4857 if (super != NULL) {
4858 super_size = super->transitive_interfaces()->length();
4859 max_transitive_size += super_size;
4860 }
4861 // Add local interfaces' super interfaces
4862 const int local_size = local_ifs->length();
4863 for (int i = 0; i < local_size; i++) {
4864 InstanceKlass* const l = local_ifs->at(i);
4865 max_transitive_size += l->transitive_interfaces()->length();
4866 }
4867 // Finally add local interfaces
4868 max_transitive_size += local_size;
4869 // Construct array
4870 if (max_transitive_size == 0) {
4871 // no interfaces, use canonicalized array
4872 return Universe::the_empty_instance_klass_array();
4873 } else if (max_transitive_size == super_size) {
4874 // no new local interfaces added, share superklass' transitive interface array
4875 return super->transitive_interfaces();
4876 } else if (max_transitive_size == local_size) {
4877 // only local interfaces added, share local interface array
4878 return local_ifs;
4879 } else {
4880 ResourceMark rm;
4881 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4882
4883 // Copy down from superclass
4884 if (super != NULL) {
4885 append_interfaces(result, super->transitive_interfaces());
4886 }
4887
4888 // Copy down from local interfaces' superinterfaces
4889 for (int i = 0; i < local_size; i++) {
4890 InstanceKlass* const l = local_ifs->at(i);
4891 append_interfaces(result, l->transitive_interfaces());
4892 }
4893 // Finally add local interfaces
4894 append_interfaces(result, local_ifs);
4895
4896 // length will be less than the max_transitive_size if duplicates were removed
4897 const int length = result->length();
4898 assert(length <= max_transitive_size, "just checking");
4899 Array<InstanceKlass*>* const new_result =
4900 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4901 for (int i = 0; i < length; i++) {
4902 InstanceKlass* const e = result->at(i);
4903 assert(e != NULL, "just checking");
4904 new_result->at_put(i, e);
4905 }
4906 return new_result;
4907 }
4908 }
4909
4910 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4911 assert(this_klass != NULL, "invariant");
4912 const Klass* const super = this_klass->super();
4913 if (super != NULL) {
4914
4915 // If the loader is not the boot loader then throw an exception if its
4916 // superclass is in package jdk.internal.reflect and its loader is not a
4917 // special reflection class loader
4918 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4919 assert(super->is_instance_klass(), "super is not instance klass");
4920 PackageEntry* super_package = super->package();
4921 if (super_package != NULL &&
4922 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4923 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4924 ResourceMark rm(THREAD);
4925 Exceptions::fthrow(
4926 THREAD_AND_LOCATION,
4927 vmSymbols::java_lang_IllegalAccessError(),
4928 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4929 this_klass->external_name(),
4930 this_klass->class_loader_data()->loader_name_and_id(),
4931 super->external_name());
4932 return;
4933 }
4934 }
4935
4936 Reflection::VerifyClassAccessResults vca_result =
4937 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4938 if (vca_result != Reflection::ACCESS_OK) {
4939 ResourceMark rm(THREAD);
4940 char* msg = Reflection::verify_class_access_msg(this_klass,
4941 InstanceKlass::cast(super),
4942 vca_result);
4943 if (msg == NULL) {
4944 bool same_module = (this_klass->module() == super->module());
4945 Exceptions::fthrow(
4946 THREAD_AND_LOCATION,
4947 vmSymbols::java_lang_IllegalAccessError(),
4948 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4949 this_klass->external_name(),
4950 super->is_abstract() ? "abstract " : "",
4951 super->external_name(),
4952 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4953 (same_module) ? "" : "; ",
4954 (same_module) ? "" : super->class_in_module_of_loader());
4955 } else {
4956 // Add additional message content.
4957 Exceptions::fthrow(
4958 THREAD_AND_LOCATION,
4959 vmSymbols::java_lang_IllegalAccessError(),
4960 "superclass access check failed: %s",
4961 msg);
4962 }
4963 }
4964 }
4965 }
4966
4967
4968 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4969 assert(this_klass != NULL, "invariant");
4970 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4971 const int lng = local_interfaces->length();
4972 for (int i = lng - 1; i >= 0; i--) {
4973 InstanceKlass* const k = local_interfaces->at(i);
4974 assert (k != NULL && k->is_interface(), "invalid interface");
4975 Reflection::VerifyClassAccessResults vca_result =
4976 Reflection::verify_class_access(this_klass, k, false);
4977 if (vca_result != Reflection::ACCESS_OK) {
4978 ResourceMark rm(THREAD);
4979 char* msg = Reflection::verify_class_access_msg(this_klass,
4980 k,
4981 vca_result);
4982 if (msg == NULL) {
4983 bool same_module = (this_klass->module() == k->module());
4984 Exceptions::fthrow(
4985 THREAD_AND_LOCATION,
4986 vmSymbols::java_lang_IllegalAccessError(),
4987 "class %s cannot access its superinterface %s (%s%s%s)",
4988 this_klass->external_name(),
4989 k->external_name(),
4990 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4991 (same_module) ? "" : "; ",
4992 (same_module) ? "" : k->class_in_module_of_loader());
4993 } else {
4994 // Add additional message content.
4995 Exceptions::fthrow(
4996 THREAD_AND_LOCATION,
4997 vmSymbols::java_lang_IllegalAccessError(),
4998 "superinterface check failed: %s",
4999 msg);
5000 }
5001 }
5002 }
5003 }
5004
5005
5006 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
5007 assert(this_klass != NULL, "invariant");
5008 const Array<Method*>* const methods = this_klass->methods();
5009 const int num_methods = methods->length();
5010
5011 // go thru each method and check if it overrides a final method
5012 for (int index = 0; index < num_methods; index++) {
5013 const Method* const m = methods->at(index);
5014
5015 // skip private, static, and <init> methods
5016 if ((!m->is_private() && !m->is_static()) &&
5017 (m->name() != vmSymbols::object_initializer_name())) {
5018
5019 const Symbol* const name = m->name();
5020 const Symbol* const signature = m->signature();
5021 const Klass* k = this_klass->super();
5022 const Method* super_m = NULL;
5023 while (k != NULL) {
5024 // skip supers that don't have final methods.
5025 if (k->has_final_method()) {
5026 // lookup a matching method in the super class hierarchy
5027 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
5028 if (super_m == NULL) {
5029 break; // didn't find any match; get out
5030 }
5031
5032 if (super_m->is_final() && !super_m->is_static() &&
5033 !super_m->access_flags().is_private()) {
5034 // matching method in super is final, and not static or private
5035 bool can_access = Reflection::verify_member_access(this_klass,
5036 super_m->method_holder(),
5037 super_m->method_holder(),
5038 super_m->access_flags(),
5039 false, false, CHECK);
5040 if (can_access) {
5041 // this class can access super final method and therefore override
5042 ResourceMark rm(THREAD);
5043 Exceptions::fthrow(THREAD_AND_LOCATION,
5044 vmSymbols::java_lang_VerifyError(),
5045 "class %s overrides final method %s.%s%s",
5046 this_klass->external_name(),
5047 super_m->method_holder()->external_name(),
5048 name->as_C_string(),
5049 signature->as_C_string()
5050 );
5051 return;
5052 }
5053 }
5054
5055 // continue to look from super_m's holder's super.
5056 k = super_m->method_holder()->super();
5057 continue;
5058 }
5059
5060 k = k->super();
5061 }
5062 }
5063 }
5064 }
5065
5066
5067 // assumes that this_klass is an interface
5068 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
5069 assert(this_klass != NULL, "invariant");
5070 assert(this_klass->is_interface(), "not an interface");
5071 const Array<Method*>* methods = this_klass->methods();
5072 const int num_methods = methods->length();
5073
5074 for (int index = 0; index < num_methods; index++) {
5075 const Method* const m = methods->at(index);
5076 // if m is static and not the init method, throw a verify error
5077 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
5078 ResourceMark rm(THREAD);
5079 Exceptions::fthrow(
5080 THREAD_AND_LOCATION,
5081 vmSymbols::java_lang_VerifyError(),
5082 "Illegal static method %s in interface %s",
5083 m->name()->as_C_string(),
5084 this_klass->external_name()
5085 );
5086 return;
5087 }
5088 }
5089 }
5090
5091 // utility methods for format checking
5092
5093 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
5094 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5095 const bool is_value_type = (flags & JVM_ACC_VALUE) != 0;
5096 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
5097 assert(supports_value_types() || !is_value_type, "JVM_ACC_VALUE should not be set");
5098 if (is_module) {
5099 ResourceMark rm(THREAD);
5100 Exceptions::fthrow(
5101 THREAD_AND_LOCATION,
5102 vmSymbols::java_lang_NoClassDefFoundError(),
5103 "%s is not a class because access_flag ACC_MODULE is set",
5104 _class_name->as_C_string());
5105 return;
5106 }
5107
5108 if (is_value_type && !EnableValhalla) {
5109 ResourceMark rm(THREAD);
5110 Exceptions::fthrow(
5111 THREAD_AND_LOCATION,
5112 vmSymbols::java_lang_ClassFormatError(),
5113 "Class modifier ACC_VALUE in class %s requires option -XX:+EnableValhalla",
5114 _class_name->as_C_string()
5115 );
5116 }
5117
5118 if (!_need_verify) { return; }
5119
5120 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5121 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5122 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5123 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
5124 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5125 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
5126 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5127
5128 if ((is_abstract && is_final) ||
5129 (is_interface && !is_abstract) ||
5130 (is_interface && major_gte_15 && (is_super || is_enum)) ||
5131 (!is_interface && major_gte_15 && is_annotation) ||
5132 (is_value_type && (is_interface || is_abstract || is_enum || !is_final))) {
5133 ResourceMark rm(THREAD);
5134 Exceptions::fthrow(
5135 THREAD_AND_LOCATION,
5136 vmSymbols::java_lang_ClassFormatError(),
5137 "Illegal class modifiers in class %s: 0x%X",
5138 _class_name->as_C_string(), flags
5139 );
5140 return;
5141 }
5142 }
5143
5144 static bool has_illegal_visibility(jint flags) {
5145 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5146 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5147 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5148
5149 return ((is_public && is_protected) ||
5150 (is_public && is_private) ||
5151 (is_protected && is_private));
5152 }
5153
5154 // A legal major_version.minor_version must be one of the following:
5155 //
5156 // Major_version = 45, any minor_version.
5157 // Major_version >= 46 and major_version <= current_major_version and minor_version = 0.
5158 // Major_version = current_major_version and minor_version = 65535 and --enable-preview is present.
5159 //
5160 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
5161 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
5162 if (major != JAVA_MIN_SUPPORTED_VERSION) { // All 45.* are ok including 45.65535
5163 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
5164 if (major != max_version) {
5165 ResourceMark rm(THREAD);
5166 Exceptions::fthrow(
5167 THREAD_AND_LOCATION,
5168 vmSymbols::java_lang_UnsupportedClassVersionError(),
5169 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
5170 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
5171 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
5172 return;
5173 }
5174
5175 if (!Arguments::enable_preview()) {
5176 ResourceMark rm(THREAD);
5177 Exceptions::fthrow(
5178 THREAD_AND_LOCATION,
5179 vmSymbols::java_lang_UnsupportedClassVersionError(),
5180 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
5181 class_name->as_C_string(), major, minor);
5182 return;
5183 }
5184
5185 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
5186 if (major > max_version) {
5187 ResourceMark rm(THREAD);
5188 Exceptions::fthrow(
5189 THREAD_AND_LOCATION,
5190 vmSymbols::java_lang_UnsupportedClassVersionError(),
5191 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5192 "this version of the Java Runtime only recognizes class file versions up to %u.0",
5193 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
5194 } else if (major < JAVA_MIN_SUPPORTED_VERSION) {
5195 ResourceMark rm(THREAD);
5196 Exceptions::fthrow(
5197 THREAD_AND_LOCATION,
5198 vmSymbols::java_lang_UnsupportedClassVersionError(),
5199 "%s (class file version %u.%u) was compiled with an invalid major version",
5200 class_name->as_C_string(), major, minor);
5201 } else if (minor != 0) {
5202 ResourceMark rm(THREAD);
5203 Exceptions::fthrow(
5204 THREAD_AND_LOCATION,
5205 vmSymbols::java_lang_UnsupportedClassVersionError(),
5206 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
5207 class_name->as_C_string(), major, minor);
5208 }
5209 }
5210 }
5211 }
5212
5213 void ClassFileParser::verify_legal_field_modifiers(jint flags,
5214 bool is_interface,
5215 bool is_value_type,
5216 TRAPS) const {
5217 if (!_need_verify) { return; }
5218
5219 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5220 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5221 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5222 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5223 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5224 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
5225 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
5226 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5227 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5228
5229 bool is_illegal = false;
5230
5231 if (is_interface) {
5232 if (!is_public || !is_static || !is_final || is_private ||
5233 is_protected || is_volatile || is_transient ||
5234 (major_gte_15 && is_enum)) {
5235 is_illegal = true;
5236 }
5237 } else { // not interface
5238 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
5239 is_illegal = true;
5240 } else {
5241 if (is_value_type && !is_static && !is_final) {
5242 is_illegal = true;
5243 }
5244 }
5245 }
5246
5247 if (is_illegal) {
5248 ResourceMark rm(THREAD);
5249 Exceptions::fthrow(
5250 THREAD_AND_LOCATION,
5251 vmSymbols::java_lang_ClassFormatError(),
5252 "Illegal field modifiers in class %s: 0x%X",
5253 _class_name->as_C_string(), flags);
5254 return;
5255 }
5256 }
5257
5258 void ClassFileParser::verify_legal_method_modifiers(jint flags,
5259 bool is_interface,
5260 bool is_value_type,
5261 const Symbol* name,
5262 TRAPS) const {
5263 if (!_need_verify) { return; }
5264
5265 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5266 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5267 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5268 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5269 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
5270 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5271 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
5272 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
5273 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
5274 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5275 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5276 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
5277 const bool is_initializer = (name == vmSymbols::object_initializer_name());
5278
5279 bool is_illegal = false;
5280
5281 if (is_interface) {
5282 if (major_gte_8) {
5283 // Class file version is JAVA_8_VERSION or later Methods of
5284 // interfaces may set any of the flags except ACC_PROTECTED,
5285 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5286 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5287 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5288 (is_native || is_protected || is_final || is_synchronized) ||
5289 // If a specific method of a class or interface has its
5290 // ACC_ABSTRACT flag set, it must not have any of its
5291 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5292 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
5293 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5294 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5295 (is_abstract && (is_private || is_static || is_strict))) {
5296 is_illegal = true;
5297 }
5298 } else if (major_gte_15) {
5299 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5300 if (!is_public || is_private || is_protected || is_static || is_final ||
5301 is_synchronized || is_native || !is_abstract || is_strict) {
5302 is_illegal = true;
5303 }
5304 } else {
5305 // Class file version is pre-JAVA_1_5_VERSION
5306 if (!is_public || is_static || is_final || is_native || !is_abstract) {
5307 is_illegal = true;
5308 }
5309 }
5310 } else { // not interface
5311 if (has_illegal_visibility(flags)) {
5312 is_illegal = true;
5313 } else {
5314 if (is_initializer) {
5315 if (is_static || is_final || is_synchronized || is_native ||
5316 is_abstract || (major_gte_15 && is_bridge)) {
5317 is_illegal = true;
5318 }
5319 } else { // not initializer
5320 if (is_value_type && is_synchronized && !is_static) {
5321 is_illegal = true;
5322 } else {
5323 if (is_abstract) {
5324 if ((is_final || is_native || is_private || is_static ||
5325 (major_gte_15 && (is_synchronized || is_strict)))) {
5326 is_illegal = true;
5327 }
5328 }
5329 }
5330 }
5331 }
5332 }
5333
5334 if (is_illegal) {
5335 ResourceMark rm(THREAD);
5336 Exceptions::fthrow(
5337 THREAD_AND_LOCATION,
5338 vmSymbols::java_lang_ClassFormatError(),
5339 "Method %s in class %s has illegal modifiers: 0x%X",
5340 name->as_C_string(), _class_name->as_C_string(), flags);
5341 return;
5342 }
5343 }
5344
5345 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5346 int length,
5347 TRAPS) const {
5348 assert(_need_verify, "only called when _need_verify is true");
5349 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5350 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5351 }
5352 }
5353
5354 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5355 // In class names, '/' separates unqualified names. This is verified in this function also.
5356 // Method names also may not contain the characters '<' or '>', unless <init>
5357 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5358 // method. Because these names have been checked as special cases before
5359 // calling this method in verify_legal_method_name.
5360 //
5361 // This method is also called from the modular system APIs in modules.cpp
5362 // to verify the validity of module and package names.
5363 bool ClassFileParser::verify_unqualified_name(const char* name,
5364 unsigned int length,
5365 int type) {
5366 for (const char* p = name; p != name + length;) {
5367 jchar ch = *p;
5368 if (ch < 128) {
5369 if (ch == '.' || ch == ';' || ch == '[' ) {
5370 return false; // do not permit '.', ';', or '['
5371 }
5372 if (ch == '/') {
5373 // check for '//' or leading or trailing '/' which are not legal
5374 // unqualified name must not be empty
5375 if (type == ClassFileParser::LegalClass) {
5376 if (p == name || p+1 >= name+length || *(p+1) == '/') {
5377 return false;
5378 }
5379 } else {
5380 return false; // do not permit '/' unless it's class name
5381 }
5382 }
5383 if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) {
5384 return false; // do not permit '<' or '>' in method names
5385 }
5386 p++;
5387 } else {
5388 char* tmp_p = UTF8::next(p, &ch);
5389 p = tmp_p;
5390 }
5391 }
5392 return true;
5393 }
5394
5395 // Take pointer to a string. Skip over the longest part of the string that could
5396 // be taken as a fieldname. Allow '/' if slash_ok is true.
5397 // Return a pointer to just past the fieldname.
5398 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5399 // being true, we saw consecutive slashes (meaning we were looking for a
5400 // qualified path but found something that was badly-formed).
5401 static const char* skip_over_field_name(const char* name,
5402 bool slash_ok,
5403 unsigned int length) {
5404 const char* p;
5405 jboolean last_is_slash = false;
5406 jboolean not_first_ch = false;
5407
5408 for (p = name; p != name + length; not_first_ch = true) {
5409 const char* old_p = p;
5410 jchar ch = *p;
5411 if (ch < 128) {
5412 p++;
5413 // quick check for ascii
5414 if ((ch >= 'a' && ch <= 'z') ||
5415 (ch >= 'A' && ch <= 'Z') ||
5416 (ch == '_' || ch == '$') ||
5417 (not_first_ch && ch >= '0' && ch <= '9')) {
5418 last_is_slash = false;
5419 continue;
5420 }
5421 if (slash_ok && ch == '/') {
5422 if (last_is_slash) {
5423 return NULL; // Don't permit consecutive slashes
5424 }
5425 last_is_slash = true;
5426 continue;
5427 }
5428 }
5429 else {
5430 jint unicode_ch;
5431 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5432 p = tmp_p;
5433 last_is_slash = false;
5434 // Check if ch is Java identifier start or is Java identifier part
5435 // 4672820: call java.lang.Character methods directly without generating separate tables.
5436 EXCEPTION_MARK;
5437
5438 // return value
5439 JavaValue result(T_BOOLEAN);
5440 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5441 JavaCallArguments args;
5442 args.push_int(unicode_ch);
5443
5444 // public static boolean isJavaIdentifierStart(char ch);
5445 JavaCalls::call_static(&result,
5446 SystemDictionary::Character_klass(),
5447 vmSymbols::isJavaIdentifierStart_name(),
5448 vmSymbols::int_bool_signature(),
5449 &args,
5450 THREAD);
5451
5452 if (HAS_PENDING_EXCEPTION) {
5453 CLEAR_PENDING_EXCEPTION;
5454 return 0;
5455 }
5456 if (result.get_jboolean()) {
5457 continue;
5458 }
5459
5460 if (not_first_ch) {
5461 // public static boolean isJavaIdentifierPart(char ch);
5462 JavaCalls::call_static(&result,
5463 SystemDictionary::Character_klass(),
5464 vmSymbols::isJavaIdentifierPart_name(),
5465 vmSymbols::int_bool_signature(),
5466 &args,
5467 THREAD);
5468
5469 if (HAS_PENDING_EXCEPTION) {
5470 CLEAR_PENDING_EXCEPTION;
5471 return 0;
5472 }
5473
5474 if (result.get_jboolean()) {
5475 continue;
5476 }
5477 }
5478 }
5479 return (not_first_ch) ? old_p : NULL;
5480 }
5481 return (not_first_ch) ? p : NULL;
5482 }
5483
5484 // Take pointer to a string. Skip over the longest part of the string that could
5485 // be taken as a field signature. Allow "void" if void_ok.
5486 // Return a pointer to just past the signature.
5487 // Return NULL if no legal signature is found.
5488 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5489 bool void_ok,
5490 unsigned int length,
5491 TRAPS) const {
5492 unsigned int array_dim = 0;
5493 while (length > 0) {
5494 switch (signature[0]) {
5495 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5496 case JVM_SIGNATURE_BOOLEAN:
5497 case JVM_SIGNATURE_BYTE:
5498 case JVM_SIGNATURE_CHAR:
5499 case JVM_SIGNATURE_SHORT:
5500 case JVM_SIGNATURE_INT:
5501 case JVM_SIGNATURE_FLOAT:
5502 case JVM_SIGNATURE_LONG:
5503 case JVM_SIGNATURE_DOUBLE:
5504 return signature + 1;
5505 case JVM_SIGNATURE_CLASS:
5506 {
5507 if (_major_version < JAVA_1_5_VERSION) {
5508 // Skip over the class name if one is there
5509 const char* const p = skip_over_field_name(signature + 1, true, --length);
5510
5511 // The next character better be a semicolon
5512 if (p && (p - signature) > 1 && p[0] == ';') {
5513 return p + 1;
5514 }
5515 }
5516 else {
5517 // Skip leading 'L' and ignore first appearance of ';'
5518 length--;
5519 signature++;
5520 char* c = strchr((char*) signature, ';');
5521 // Format check signature
5522 if (c != NULL) {
5523 ResourceMark rm(THREAD);
5524 int newlen = c - (char*) signature;
5525 char* sig = NEW_RESOURCE_ARRAY(char, newlen + 1);
5526 strncpy(sig, signature, newlen);
5527 sig[newlen] = '\0';
5528
5529 bool legal = verify_unqualified_name(sig, newlen, LegalClass);
5530 if (!legal) {
5531 classfile_parse_error("Class name contains illegal character "
5532 "in descriptor in class file %s",
5533 CHECK_0);
5534 return NULL;
5535 }
5536 return signature + newlen + 1;
5537 }
5538 }
5539 return NULL;
5540 }
5541 case JVM_SIGNATURE_ARRAY:
5542 array_dim++;
5543 if (array_dim > 255) {
5544 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5545 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5546 }
5547 // The rest of what's there better be a legal signature
5548 signature++;
5549 length--;
5550 void_ok = false;
5551 break;
5552 default:
5553 return NULL;
5554 }
5555 }
5556 return NULL;
5557 }
5558
5559 // Checks if name is a legal class name.
5560 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5561 if (!_need_verify || _relax_verify) { return; }
5562
5563 char buf[fixed_buffer_size];
5564 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5565 unsigned int length = name->utf8_length();
5566 bool legal = false;
5567
5568 if (length > 0) {
5569 const char* p;
5570 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5571 p = skip_over_field_signature(bytes, false, length, CHECK);
5572 legal = (p != NULL) && ((p - bytes) == (int)length);
5573 } else if (_major_version < JAVA_1_5_VERSION) {
5574 if (bytes[0] != '<') {
5575 p = skip_over_field_name(bytes, true, length);
5576 legal = (p != NULL) && ((p - bytes) == (int)length);
5577 }
5578 } else {
5579 // 4900761: relax the constraints based on JSR202 spec
5580 // Class names may be drawn from the entire Unicode character set.
5581 // Identifiers between '/' must be unqualified names.
5582 // The utf8 string has been verified when parsing cpool entries.
5583 legal = verify_unqualified_name(bytes, length, LegalClass);
5584 }
5585 }
5586 if (!legal) {
5587 ResourceMark rm(THREAD);
5588 assert(_class_name != NULL, "invariant");
5589 Exceptions::fthrow(
5590 THREAD_AND_LOCATION,
5591 vmSymbols::java_lang_ClassFormatError(),
5592 "Illegal class name \"%s\" in class file %s", bytes,
5593 _class_name->as_C_string()
5594 );
5595 return;
5596 }
5597 }
5598
5599 // Checks if name is a legal field name.
5600 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5601 if (!_need_verify || _relax_verify) { return; }
5602
5603 char buf[fixed_buffer_size];
5604 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5605 unsigned int length = name->utf8_length();
5606 bool legal = false;
5607
5608 if (length > 0) {
5609 if (_major_version < JAVA_1_5_VERSION) {
5610 if (bytes[0] != '<') {
5611 const char* p = skip_over_field_name(bytes, false, length);
5612 legal = (p != NULL) && ((p - bytes) == (int)length);
5613 }
5614 } else {
5615 // 4881221: relax the constraints based on JSR202 spec
5616 legal = verify_unqualified_name(bytes, length, LegalField);
5617 }
5618 }
5619
5620 if (!legal) {
5621 ResourceMark rm(THREAD);
5622 assert(_class_name != NULL, "invariant");
5623 Exceptions::fthrow(
5624 THREAD_AND_LOCATION,
5625 vmSymbols::java_lang_ClassFormatError(),
5626 "Illegal field name \"%s\" in class %s", bytes,
5627 _class_name->as_C_string()
5628 );
5629 return;
5630 }
5631 }
5632
5633 // Checks if name is a legal method name.
5634 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5635 if (!_need_verify || _relax_verify) { return; }
5636
5637 assert(name != NULL, "method name is null");
5638 char buf[fixed_buffer_size];
5639 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5640 unsigned int length = name->utf8_length();
5641 bool legal = false;
5642
5643 if (length > 0) {
5644 if (bytes[0] == '<') {
5645 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5646 legal = true;
5647 }
5648 } else if (_major_version < JAVA_1_5_VERSION) {
5649 const char* p;
5650 p = skip_over_field_name(bytes, false, length);
5651 legal = (p != NULL) && ((p - bytes) == (int)length);
5652 } else {
5653 // 4881221: relax the constraints based on JSR202 spec
5654 legal = verify_unqualified_name(bytes, length, LegalMethod);
5655 }
5656 }
5657
5658 if (!legal) {
5659 ResourceMark rm(THREAD);
5660 assert(_class_name != NULL, "invariant");
5661 Exceptions::fthrow(
5662 THREAD_AND_LOCATION,
5663 vmSymbols::java_lang_ClassFormatError(),
5664 "Illegal method name \"%s\" in class %s", bytes,
5665 _class_name->as_C_string()
5666 );
5667 return;
5668 }
5669 }
5670
5671
5672 // Checks if signature is a legal field signature.
5673 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5674 const Symbol* signature,
5675 TRAPS) const {
5676 if (!_need_verify) { return; }
5677
5678 char buf[fixed_buffer_size];
5679 const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5680 const unsigned int length = signature->utf8_length();
5681 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5682
5683 if (p == NULL || (p - bytes) != (int)length) {
5684 throwIllegalSignature("Field", name, signature, CHECK);
5685 }
5686 }
5687
5688 // Checks if signature is a legal method signature.
5689 // Returns number of parameters
5690 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5691 const Symbol* signature,
5692 TRAPS) const {
5693 if (!_need_verify) {
5694 // make sure caller's args_size will be less than 0 even for non-static
5695 // method so it will be recomputed in compute_size_of_parameters().
5696 return -2;
5697 }
5698
5699 // Class initializers cannot have args for class format version >= 51.
5700 if (name == vmSymbols::class_initializer_name() &&
5701 signature != vmSymbols::void_method_signature() &&
5702 _major_version >= JAVA_7_VERSION) {
5703 throwIllegalSignature("Method", name, signature, CHECK_0);
5704 return 0;
5705 }
5706
5707 unsigned int args_size = 0;
5708 char buf[fixed_buffer_size];
5709 const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5710 unsigned int length = signature->utf8_length();
5711 const char* nextp;
5712
5713 // The first character must be a '('
5714 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5715 length--;
5716 // Skip over legal field signatures
5717 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5718 while ((length > 0) && (nextp != NULL)) {
5719 args_size++;
5720 if (p[0] == 'J' || p[0] == 'D') {
5721 args_size++;
5722 }
5723 length -= nextp - p;
5724 p = nextp;
5725 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5726 }
5727 // The first non-signature thing better be a ')'
5728 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5729 length--;
5730 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5731 // All internal methods must return void
5732 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5733 return args_size;
5734 }
5735 } else {
5736 // Now we better just have a return value
5737 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5738 if (nextp && ((int)length == (nextp - p))) {
5739 return args_size;
5740 }
5741 }
5742 }
5743 }
5744 // Report error
5745 throwIllegalSignature("Method", name, signature, CHECK_0);
5746 return 0;
5747 }
5748
5749 int ClassFileParser::static_field_size() const {
5750 assert(_field_info != NULL, "invariant");
5751 return _field_info->static_field_size;
5752 }
5753
5754 int ClassFileParser::total_oop_map_count() const {
5755 assert(_field_info != NULL, "invariant");
5756 return _field_info->oop_map_blocks->nonstatic_oop_map_count;
5757 }
5758
5759 jint ClassFileParser::layout_size() const {
5760 assert(_field_info != NULL, "invariant");
5761 return _field_info->instance_size;
5762 }
5763
5764 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5765 const Array<Method*>* methods) {
5766 assert(ik != NULL, "invariant");
5767 assert(methods != NULL, "invariant");
5768
5769 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5770 // (We used to do this lazily, but now we query it in Rewriter,
5771 // which is eagerly done for every method, so we might as well do it now,
5772 // when everything is fresh in memory.)
5773 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5774
5775 if (klass_id != vmSymbols::NO_SID) {
5776 for (int j = 0; j < methods->length(); ++j) {
5777 Method* method = methods->at(j);
5778 method->init_intrinsic_id();
5779
5780 if (CheckIntrinsics) {
5781 // Check if an intrinsic is defined for method 'method',
5782 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5783 if (method->intrinsic_id() != vmIntrinsics::_none &&
5784 !method->intrinsic_candidate()) {
5785 tty->print("Compiler intrinsic is defined for method [%s], "
5786 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5787 method->name_and_sig_as_C_string(),
5788 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5789 );
5790 tty->cr();
5791 DEBUG_ONLY(vm_exit(1));
5792 }
5793 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5794 // but there is no intrinsic available for it.
5795 if (method->intrinsic_candidate() &&
5796 method->intrinsic_id() == vmIntrinsics::_none) {
5797 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5798 "but no compiler intrinsic is defined for the method.%s",
5799 method->name_and_sig_as_C_string(),
5800 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5801 );
5802 tty->cr();
5803 DEBUG_ONLY(vm_exit(1));
5804 }
5805 }
5806 } // end for
5807
5808 #ifdef ASSERT
5809 if (CheckIntrinsics) {
5810 // Check for orphan methods in the current class. A method m
5811 // of a class C is orphan if an intrinsic is defined for method m,
5812 // but class C does not declare m.
5813 // The check is potentially expensive, therefore it is available
5814 // only in debug builds.
5815
5816 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5817 if (vmIntrinsics::_compiledLambdaForm == id) {
5818 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5819 // generated for the JVM from a LambdaForm and therefore no method
5820 // is defined for it.
5821 continue;
5822 }
5823
5824 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5825 // Check if the current class contains a method with the same
5826 // name, flags, signature.
5827 bool match = false;
5828 for (int j = 0; j < methods->length(); ++j) {
5829 const Method* method = methods->at(j);
5830 if (method->intrinsic_id() == id) {
5831 match = true;
5832 break;
5833 }
5834 }
5835
5836 if (!match) {
5837 char buf[1000];
5838 tty->print("Compiler intrinsic is defined for method [%s], "
5839 "but the method is not available in class [%s].%s",
5840 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5841 buf, sizeof(buf)),
5842 ik->name()->as_C_string(),
5843 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5844 );
5845 tty->cr();
5846 DEBUG_ONLY(vm_exit(1));
5847 }
5848 }
5849 } // end for
5850 } // CheckIntrinsics
5851 #endif // ASSERT
5852 }
5853 }
5854
5855 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5856 if (_klass != NULL) {
5857 return _klass;
5858 }
5859
5860 InstanceKlass* const ik =
5861 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5862
5863 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5864
5865 assert(_klass == ik, "invariant");
5866
5867 ik->set_has_passed_fingerprint_check(false);
5868 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5869 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5870 if (aot_fp != 0 && aot_fp == _stream->compute_fingerprint()) {
5871 // This class matches with a class saved in an AOT library
5872 ik->set_has_passed_fingerprint_check(true);
5873 } else {
5874 ResourceMark rm;
5875 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5876 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5877 }
5878 }
5879
5880 if (ik->is_value()) {
5881 ValueKlass* vk = ValueKlass::cast(ik);
5882 oop val = ik->allocate_instance(CHECK_NULL);
5883 vk->set_default_value(val);
5884 }
5885
5886 return ik;
5887 }
5888
5889 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5890 assert(ik != NULL, "invariant");
5891
5892 // Set name and CLD before adding to CLD
5893 ik->set_class_loader_data(_loader_data);
5894 ik->set_name(_class_name);
5895
5896 // Add all classes to our internal class loader list here,
5897 // including classes in the bootstrap (NULL) class loader.
5898 const bool publicize = !is_internal();
5899
5900 _loader_data->add_class(ik, publicize);
5901
5902 set_klass_to_deallocate(ik);
5903
5904 assert(_field_info != NULL, "invariant");
5905 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5906 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->nonstatic_oop_map_count,
5907 "sanity");
5908
5909 assert(ik->is_instance_klass(), "sanity");
5910 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5911
5912 // Fill in information already parsed
5913 ik->set_should_verify_class(_need_verify);
5914
5915 // Not yet: supers are done below to support the new subtype-checking fields
5916 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5917 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5918 assert(_fac != NULL, "invariant");
5919 ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_FLATTENABLE]);
5920
5921 // this transfers ownership of a lot of arrays from
5922 // the parser onto the InstanceKlass*
5923 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5924
5925 // note that is not safe to use the fields in the parser from this point on
5926 assert(NULL == _cp, "invariant");
5927 assert(NULL == _fields, "invariant");
5928 assert(NULL == _methods, "invariant");
5929 assert(NULL == _inner_classes, "invariant");
5930 assert(NULL == _nest_members, "invariant");
5931 assert(NULL == _local_interfaces, "invariant");
5932 assert(NULL == _combined_annotations, "invariant");
5933
5934 if (_has_final_method) {
5935 ik->set_has_final_method();
5936 }
5937
5938 ik->copy_method_ordering(_method_ordering, CHECK);
5939 // The InstanceKlass::_methods_jmethod_ids cache
5940 // is managed on the assumption that the initial cache
5941 // size is equal to the number of methods in the class. If
5942 // that changes, then InstanceKlass::idnum_can_increment()
5943 // has to be changed accordingly.
5944 ik->set_initial_method_idnum(ik->methods()->length());
5945
5946 ik->set_this_class_index(_this_class_index);
5947
5948 if (is_unsafe_anonymous()) {
5949 // _this_class_index is a CONSTANT_Class entry that refers to this
5950 // anonymous class itself. If this class needs to refer to its own methods or
5951 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5952 // _this_class_index. However, because this class is anonymous (it's
5953 // not stored in SystemDictionary), _this_class_index cannot be resolved
5954 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5955 // Therefore, we must eagerly resolve _this_class_index now.
5956 ik->constants()->klass_at_put(_this_class_index, ik);
5957 }
5958
5959 ik->set_minor_version(_minor_version);
5960 ik->set_major_version(_major_version);
5961 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5962 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5963
5964 if (_unsafe_anonymous_host != NULL) {
5965 assert (ik->is_unsafe_anonymous(), "should be the same");
5966 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host);
5967 }
5968
5969 // Set PackageEntry for this_klass
5970 oop cl = ik->class_loader();
5971 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5972 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5973 ik->set_package(cld, CHECK);
5974
5975 const Array<Method*>* const methods = ik->methods();
5976 assert(methods != NULL, "invariant");
5977 const int methods_len = methods->length();
5978
5979 check_methods_for_intrinsics(ik, methods);
5980
5981 // Fill in field values obtained by parse_classfile_attributes
5982 if (_parsed_annotations->has_any_annotations()) {
5983 _parsed_annotations->apply_to(ik);
5984 }
5985
5986 apply_parsed_class_attributes(ik);
5987
5988 // Miranda methods
5989 if ((_num_miranda_methods > 0) ||
5990 // if this class introduced new miranda methods or
5991 (_super_klass != NULL && _super_klass->has_miranda_methods())
5992 // super class exists and this class inherited miranda methods
5993 ) {
5994 ik->set_has_miranda_methods(); // then set a flag
5995 }
5996
5997 // Fill in information needed to compute superclasses.
5998 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5999 ik->set_transitive_interfaces(_transitive_interfaces);
6000 _transitive_interfaces = NULL;
6001
6002 // Initialize itable offset tables
6003 klassItable::setup_itable_offset_table(ik);
6004
6005 // Compute transitive closure of interfaces this class implements
6006 // Do final class setup
6007 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
6008 if (oop_map_blocks->nonstatic_oop_map_count > 0) {
6009 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
6010 }
6011
6012 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
6013 set_precomputed_flags(ik, CHECK);
6014
6015 // check if this class can access its super class
6016 check_super_class_access(ik, CHECK);
6017
6018 // check if this class can access its superinterfaces
6019 check_super_interface_access(ik, CHECK);
6020
6021 // check if this class overrides any final method
6022 check_final_method_override(ik, CHECK);
6023
6024 // reject static interface methods prior to Java 8
6025 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
6026 check_illegal_static_method(ik, CHECK);
6027 }
6028
6029 // Obtain this_klass' module entry
6030 ModuleEntry* module_entry = ik->module();
6031 assert(module_entry != NULL, "module_entry should always be set");
6032
6033 // Obtain java.lang.Module
6034 Handle module_handle(THREAD, module_entry->module());
6035
6036 // Allocate mirror and initialize static fields
6037 // The create_mirror() call will also call compute_modifiers()
6038 java_lang_Class::create_mirror(ik,
6039 Handle(THREAD, _loader_data->class_loader()),
6040 module_handle,
6041 _protection_domain,
6042 CHECK);
6043
6044 assert(_all_mirandas != NULL, "invariant");
6045
6046 // Generate any default methods - default methods are public interface methods
6047 // that have a default implementation. This is new with Java 8.
6048 if (_has_nonstatic_concrete_methods) {
6049 DefaultMethods::generate_default_methods(ik,
6050 _all_mirandas,
6051 CHECK);
6052 }
6053
6054 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
6055 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
6056 !module_entry->has_default_read_edges()) {
6057 if (!module_entry->set_has_default_read_edges()) {
6058 // We won a potential race
6059 JvmtiExport::add_default_read_edges(module_handle, THREAD);
6060 }
6061 }
6062
6063 int nfields = ik->java_fields_count();
6064 if (ik->is_value()) nfields++;
6065 for (int i = 0; i < nfields; i++) {
6066 if (ik->field_access_flags(i) & JVM_ACC_FLATTENABLE) {
6067 Klass* klass = SystemDictionary::resolve_or_fail(ik->field_signature(i),
6068 Handle(THREAD, ik->class_loader()),
6069 Handle(THREAD, ik->protection_domain()), true, CHECK);
6070 assert(klass != NULL, "Sanity check");
6071 assert(klass->access_flags().is_value_type(), "Value type expected");
6072 ik->set_value_field_klass(i, klass);
6073 } else if (is_value_type() && ((ik->field_access_flags(i) & JVM_ACC_FIELD_INTERNAL) != 0)
6074 && ((ik->field_access_flags(i) & JVM_ACC_STATIC) != 0)) {
6075 ValueKlass::cast(ik)->set_default_value_offset(ik->field_offset(i));
6076 }
6077 }
6078
6079 if (is_value_type()) {
6080 ValueKlass::cast(ik)->initialize_calling_convention(CHECK);
6081 }
6082
6083 // Update the loader_data graph.
6084 record_defined_class_dependencies(ik, CHECK);
6085
6086 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
6087
6088 if (!is_internal()) {
6089 if (log_is_enabled(Info, class, load)) {
6090 ResourceMark rm;
6091 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
6092 ik->print_class_load_logging(_loader_data, module_name, _stream);
6093 }
6094
6095 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
6096 ik->major_version() != JAVA_MIN_SUPPORTED_VERSION &&
6097 log_is_enabled(Info, class, preview)) {
6098 ResourceMark rm;
6099 log_info(class, preview)("Loading preview feature type %s", ik->external_name());
6100 }
6101
6102 if (log_is_enabled(Debug, class, resolve)) {
6103 ResourceMark rm;
6104 // print out the superclass.
6105 const char * from = ik->external_name();
6106 if (ik->java_super() != NULL) {
6107 log_debug(class, resolve)("%s %s (super)",
6108 from,
6109 ik->java_super()->external_name());
6110 }
6111 // print out each of the interface classes referred to by this class.
6112 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
6113 if (local_interfaces != NULL) {
6114 const int length = local_interfaces->length();
6115 for (int i = 0; i < length; i++) {
6116 const InstanceKlass* const k = local_interfaces->at(i);
6117 const char * to = k->external_name();
6118 log_debug(class, resolve)("%s %s (interface)", from, to);
6119 }
6120 }
6121 }
6122 }
6123
6124 JFR_ONLY(INIT_ID(ik);)
6125
6126 // If we reach here, all is well.
6127 // Now remove the InstanceKlass* from the _klass_to_deallocate field
6128 // in order for it to not be destroyed in the ClassFileParser destructor.
6129 set_klass_to_deallocate(NULL);
6130
6131 // it's official
6132 set_klass(ik);
6133
6134 debug_only(ik->verify();)
6135 }
6136
6137 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's
6138 // package by prepending its host class's package name to its class name and setting
6139 // its _class_name field.
6140 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) {
6141 ResourceMark rm(THREAD);
6142 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
6143 "Unsafe anonymous class should not be in a package");
6144 const char* host_pkg_name =
6145 ClassLoader::package_from_name(unsafe_anonymous_host->name()->as_C_string(), NULL);
6146
6147 if (host_pkg_name != NULL) {
6148 size_t host_pkg_len = strlen(host_pkg_name);
6149 int class_name_len = _class_name->utf8_length();
6150 char* new_anon_name =
6151 NEW_RESOURCE_ARRAY(char, host_pkg_len + 1 + class_name_len);
6152 // Copy host package name and trailing /.
6153 strncpy(new_anon_name, host_pkg_name, host_pkg_len);
6154 new_anon_name[host_pkg_len] = '/';
6155 // Append unsafe anonymous class name. The unsafe anonymous class name can contain odd
6156 // characters. So, do a strncpy instead of using sprintf("%s...").
6157 strncpy(new_anon_name + host_pkg_len + 1, (char *)_class_name->base(), class_name_len);
6158
6159 // Create a symbol and update the anonymous class name.
6160 _class_name = SymbolTable::new_symbol(new_anon_name,
6161 (int)host_pkg_len + 1 + class_name_len,
6162 CHECK);
6163 }
6164 }
6165
6166 // If the host class and the anonymous class are in the same package then do
6167 // nothing. If the anonymous class is in the unnamed package then move it to its
6168 // host's package. If the classes are in different packages then throw an IAE
6169 // exception.
6170 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) {
6171 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class");
6172
6173 const jbyte* anon_last_slash = UTF8::strrchr(_class_name->base(),
6174 _class_name->utf8_length(), '/');
6175 if (anon_last_slash == NULL) { // Unnamed package
6176 prepend_host_package_name(_unsafe_anonymous_host, CHECK);
6177 } else {
6178 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) {
6179 ResourceMark rm(THREAD);
6180 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
6181 err_msg("Host class %s and anonymous class %s are in different packages",
6182 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string()));
6183 }
6184 }
6185 }
6186
6187 static bool relax_format_check_for(ClassLoaderData* loader_data) {
6188 bool trusted = (loader_data->is_the_null_class_loader_data() ||
6189 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
6190 bool need_verify =
6191 // verifyAll
6192 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
6193 // verifyRemote
6194 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
6195 return !need_verify;
6196 }
6197
6198 ClassFileParser::ClassFileParser(ClassFileStream* stream,
6199 Symbol* name,
6200 ClassLoaderData* loader_data,
6201 Handle protection_domain,
6202 const InstanceKlass* unsafe_anonymous_host,
6203 GrowableArray<Handle>* cp_patches,
6204 Publicity pub_level,
6205 TRAPS) :
6206 _stream(stream),
6207 _requested_name(name),
6208 _loader_data(loader_data),
6209 _unsafe_anonymous_host(unsafe_anonymous_host),
6210 _cp_patches(cp_patches),
6211 _num_patched_klasses(0),
6212 _max_num_patched_klasses(0),
6213 _orig_cp_size(0),
6214 _first_patched_klass_resolved_index(0),
6215 _super_klass(),
6216 _cp(NULL),
6217 _fields(NULL),
6218 _methods(NULL),
6219 _inner_classes(NULL),
6220 _nest_members(NULL),
6221 _nest_host(0),
6222 _value_types(NULL),
6223 _local_interfaces(NULL),
6224 _transitive_interfaces(NULL),
6225 _combined_annotations(NULL),
6226 _annotations(NULL),
6227 _type_annotations(NULL),
6228 _fields_annotations(NULL),
6229 _fields_type_annotations(NULL),
6230 _klass(NULL),
6231 _klass_to_deallocate(NULL),
6232 _parsed_annotations(NULL),
6233 _fac(NULL),
6234 _field_info(NULL),
6235 _method_ordering(NULL),
6236 _all_mirandas(NULL),
6237 _vtable_size(0),
6238 _itable_size(0),
6239 _num_miranda_methods(0),
6240 _rt(REF_NONE),
6241 _protection_domain(protection_domain),
6242 _access_flags(),
6243 _pub_level(pub_level),
6244 _bad_constant_seen(0),
6245 _synthetic_flag(false),
6246 _sde_length(false),
6247 _sde_buffer(NULL),
6248 _sourcefile_index(0),
6249 _generic_signature_index(0),
6250 _major_version(0),
6251 _minor_version(0),
6252 _this_class_index(0),
6253 _super_class_index(0),
6254 _itfs_len(0),
6255 _java_fields_count(0),
6256 _need_verify(false),
6257 _relax_verify(false),
6258 _has_nonstatic_concrete_methods(false),
6259 _declares_nonstatic_concrete_methods(false),
6260 _has_final_method(false),
6261 _has_flattenable_fields(false),
6262 _has_finalizer(false),
6263 _has_empty_finalizer(false),
6264 _has_vanilla_constructor(false),
6265 _max_bootstrap_specifier_index(-1) {
6266
6267 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6268
6269 assert(THREAD->is_Java_thread(), "invariant");
6270 assert(_loader_data != NULL, "invariant");
6271 assert(stream != NULL, "invariant");
6272 assert(_stream != NULL, "invariant");
6273 assert(_stream->buffer() == _stream->current(), "invariant");
6274 assert(_class_name != NULL, "invariant");
6275 assert(0 == _access_flags.as_int(), "invariant");
6276
6277 // Figure out whether we can skip format checking (matching classic VM behavior)
6278 if (DumpSharedSpaces) {
6279 // verify == true means it's a 'remote' class (i.e., non-boot class)
6280 // Verification decision is based on BytecodeVerificationRemote flag
6281 // for those classes.
6282 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
6283 BytecodeVerificationLocal;
6284 }
6285 else {
6286 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
6287 stream->need_verify());
6288 }
6289 if (_cp_patches != NULL) {
6290 int len = _cp_patches->length();
6291 for (int i=0; i<len; i++) {
6292 if (has_cp_patch_at(i)) {
6293 Handle patch = cp_patch_at(i);
6294 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
6295 // We need to append the names of the patched classes to the end of the constant pool,
6296 // because a patched class may have a Utf8 name that's not already included in the
6297 // original constant pool. These class names are used when patch_constant_pool()
6298 // calls patch_class().
6299 //
6300 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
6301 // At this point, we don't know the tag for index i yet, because we haven't parsed the
6302 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
6303 _max_num_patched_klasses++;
6304 }
6305 }
6306 }
6307 }
6308
6309 // synch back verification state to stream
6310 stream->set_verify(_need_verify);
6311
6312 // Check if verification needs to be relaxed for this class file
6313 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
6314 _relax_verify = relax_format_check_for(_loader_data);
6315
6316 parse_stream(stream, CHECK);
6317
6318 post_process_parsed_stream(stream, _cp, CHECK);
6319 }
6320
6321 void ClassFileParser::clear_class_metadata() {
6322 // metadata created before the instance klass is created. Must be
6323 // deallocated if classfile parsing returns an error.
6324 _cp = NULL;
6325 _fields = NULL;
6326 _methods = NULL;
6327 _inner_classes = NULL;
6328 _nest_members = NULL;
6329 _local_interfaces = NULL;
6330 _combined_annotations = NULL;
6331 _annotations = _type_annotations = NULL;
6332 _fields_annotations = _fields_type_annotations = NULL;
6333 }
6334
6335 // Destructor to clean up
6336 ClassFileParser::~ClassFileParser() {
6337 if (_cp != NULL) {
6338 MetadataFactory::free_metadata(_loader_data, _cp);
6339 }
6340 if (_fields != NULL) {
6341 MetadataFactory::free_array<u2>(_loader_data, _fields);
6342 }
6343
6344 if (_methods != NULL) {
6345 // Free methods
6346 InstanceKlass::deallocate_methods(_loader_data, _methods);
6347 }
6348
6349 // beware of the Universe::empty_blah_array!!
6350 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6351 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6352 }
6353
6354 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
6355 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6356 }
6357
6358 // Free interfaces
6359 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6360 _local_interfaces, _transitive_interfaces);
6361
6362 if (_combined_annotations != NULL) {
6363 // After all annotations arrays have been created, they are installed into the
6364 // Annotations object that will be assigned to the InstanceKlass being created.
6365
6366 // Deallocate the Annotations object and the installed annotations arrays.
6367 _combined_annotations->deallocate_contents(_loader_data);
6368
6369 // If the _combined_annotations pointer is non-NULL,
6370 // then the other annotations fields should have been cleared.
6371 assert(_annotations == NULL, "Should have been cleared");
6372 assert(_type_annotations == NULL, "Should have been cleared");
6373 assert(_fields_annotations == NULL, "Should have been cleared");
6374 assert(_fields_type_annotations == NULL, "Should have been cleared");
6375 } else {
6376 // If the annotations arrays were not installed into the Annotations object,
6377 // then they have to be deallocated explicitly.
6378 MetadataFactory::free_array<u1>(_loader_data, _annotations);
6379 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
6380 Annotations::free_contents(_loader_data, _fields_annotations);
6381 Annotations::free_contents(_loader_data, _fields_type_annotations);
6382 }
6383
6384 clear_class_metadata();
6385 _transitive_interfaces = NULL;
6386
6387 // deallocate the klass if already created. Don't directly deallocate, but add
6388 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6389 // at a safepoint.
6390 if (_klass_to_deallocate != NULL) {
6391 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6392 }
6393 }
6394
6395 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6396 TRAPS) {
6397
6398 assert(stream != NULL, "invariant");
6399 assert(_class_name != NULL, "invariant");
6400
6401 // BEGIN STREAM PARSING
6402 stream->guarantee_more(8, CHECK); // magic, major, minor
6403 // Magic value
6404 const u4 magic = stream->get_u4_fast();
6405 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6406 "Incompatible magic value %u in class file %s",
6407 magic, CHECK);
6408
6409 // Version numbers
6410 _minor_version = stream->get_u2_fast();
6411 _major_version = stream->get_u2_fast();
6412
6413 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) {
6414 ResourceMark rm;
6415 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
6416 _major_version, _minor_version, _class_name->as_C_string());
6417 Exceptions::fthrow(
6418 THREAD_AND_LOCATION,
6419 vmSymbols::java_lang_UnsupportedClassVersionError(),
6420 "Unsupported major.minor version for dump time %u.%u",
6421 _major_version,
6422 _minor_version);
6423 }
6424
6425 // Check version numbers - we check this even with verifier off
6426 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6427
6428 stream->guarantee_more(3, CHECK); // length, first cp tag
6429 u2 cp_size = stream->get_u2_fast();
6430
6431 guarantee_property(
6432 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6433 cp_size, CHECK);
6434
6435 _orig_cp_size = cp_size;
6436 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6437 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6438 }
6439 cp_size += _max_num_patched_klasses;
6440
6441 _cp = ConstantPool::allocate(_loader_data,
6442 cp_size,
6443 CHECK);
6444
6445 ConstantPool* const cp = _cp;
6446
6447 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6448
6449 assert(cp_size == (const u2)cp->length(), "invariant");
6450
6451 // ACCESS FLAGS
6452 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6453
6454 jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
6455 // JVM_ACC_MODULE is defined in JDK-9 and later.
6456 if (_major_version >= JAVA_9_VERSION) {
6457 recognized_modifiers |= JVM_ACC_MODULE;
6458 }
6459 // JVM_ACC_VALUE is defined for class file version 55 and later
6460 if (supports_value_types()) {
6461 recognized_modifiers |= JVM_ACC_VALUE;
6462 }
6463
6464 // Access flags
6465 jint flags = stream->get_u2_fast() & recognized_modifiers;
6466
6467 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6468 // Set abstract bit for old class files for backward compatibility
6469 flags |= JVM_ACC_ABSTRACT;
6470 }
6471
6472 verify_legal_class_modifiers(flags, CHECK);
6473
6474 short bad_constant = class_bad_constant_seen();
6475 if (bad_constant != 0) {
6476 // Do not throw CFE until after the access_flags are checked because if
6477 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6478 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6479 }
6480
6481 _access_flags.set_flags(flags);
6482
6483 // This class and superclass
6484 _this_class_index = stream->get_u2_fast();
6485 check_property(
6486 valid_cp_range(_this_class_index, cp_size) &&
6487 cp->tag_at(_this_class_index).is_unresolved_klass(),
6488 "Invalid this class index %u in constant pool in class file %s",
6489 _this_class_index, CHECK);
6490
6491 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6492 assert(class_name_in_cp != NULL, "class_name can't be null");
6493
6494 // Update _class_name which could be null previously
6495 // to reflect the name in the constant pool
6496 _class_name = class_name_in_cp;
6497
6498 // Don't need to check whether this class name is legal or not.
6499 // It has been checked when constant pool is parsed.
6500 // However, make sure it is not an array type.
6501 if (_need_verify) {
6502 guarantee_property(_class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
6503 "Bad class name in class file %s",
6504 CHECK);
6505 }
6506
6507 // Checks if name in class file matches requested name
6508 if (_requested_name != NULL && _requested_name != _class_name) {
6509 ResourceMark rm(THREAD);
6510 Exceptions::fthrow(
6511 THREAD_AND_LOCATION,
6512 vmSymbols::java_lang_NoClassDefFoundError(),
6513 "%s (wrong name: %s)",
6514 _class_name->as_C_string(),
6515 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6516 );
6517 return;
6518 }
6519
6520 // if this is an anonymous class fix up its name if it's in the unnamed
6521 // package. Otherwise, throw IAE if it is in a different package than
6522 // its host class.
6523 if (_unsafe_anonymous_host != NULL) {
6524 fix_unsafe_anonymous_class_name(CHECK);
6525 }
6526
6527 // Verification prevents us from creating names with dots in them, this
6528 // asserts that that's the case.
6529 assert(is_internal_format(_class_name), "external class name format used internally");
6530
6531 if (!is_internal()) {
6532 LogTarget(Debug, class, preorder) lt;
6533 if (lt.is_enabled()){
6534 ResourceMark rm(THREAD);
6535 LogStream ls(lt);
6536 ls.print("%s", _class_name->as_klass_external_name());
6537 if (stream->source() != NULL) {
6538 ls.print(" source: %s", stream->source());
6539 }
6540 ls.cr();
6541 }
6542
6543 #if INCLUDE_CDS
6544 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6545 if (!ClassLoader::has_jrt_entry()) {
6546 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6547 DumpLoadedClassList = NULL;
6548 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6549 _unsafe_anonymous_host == NULL) {
6550 // Only dump the classes that can be stored into CDS archive.
6551 // Unsafe anonymous classes such as generated LambdaForm classes are also not included.
6552 oop class_loader = _loader_data->class_loader();
6553 ResourceMark rm(THREAD);
6554 bool skip = false;
6555 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6556 // For the boot and platform class loaders, skip classes that are not found in the
6557 // java runtime image, such as those found in the --patch-module entries.
6558 // These classes can't be loaded from the archive during runtime.
6559 if (!ClassLoader::is_modules_image(stream->source()) && strncmp(stream->source(), "jrt:", 4) != 0) {
6560 skip = true;
6561 }
6562
6563 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6564 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6565 // as they can be loaded from the archive during runtime.
6566 skip = false;
6567 }
6568 }
6569 if (skip) {
6570 tty->print_cr("skip writing class %s from source %s to classlist file",
6571 _class_name->as_C_string(), stream->source());
6572 } else {
6573 classlist_file->print_cr("%s", _class_name->as_C_string());
6574 classlist_file->flush();
6575 }
6576 }
6577 }
6578 #endif
6579 }
6580
6581 // SUPERKLASS
6582 _super_class_index = stream->get_u2_fast();
6583 _super_klass = parse_super_class(cp,
6584 _super_class_index,
6585 _need_verify,
6586 CHECK);
6587
6588 // Interfaces
6589 _itfs_len = stream->get_u2_fast();
6590 parse_interfaces(stream,
6591 _itfs_len,
6592 cp,
6593 &_has_nonstatic_concrete_methods,
6594 CHECK);
6595
6596 assert(_local_interfaces != NULL, "invariant");
6597
6598 // Fields (offsets are filled in later)
6599 _fac = new FieldAllocationCount();
6600 parse_fields(stream,
6601 _access_flags.is_interface(),
6602 _access_flags.is_value_type(),
6603 _fac,
6604 cp,
6605 cp_size,
6606 &_java_fields_count,
6607 CHECK);
6608
6609 assert(_fields != NULL, "invariant");
6610
6611 // Methods
6612 AccessFlags promoted_flags;
6613 parse_methods(stream,
6614 _access_flags.is_interface(),
6615 _access_flags.is_value_type(),
6616 &promoted_flags,
6617 &_has_final_method,
6618 &_declares_nonstatic_concrete_methods,
6619 CHECK);
6620
6621 assert(_methods != NULL, "invariant");
6622
6623 // promote flags from parse_methods() to the klass' flags
6624 _access_flags.add_promoted_flags(promoted_flags.as_int());
6625
6626 if (_declares_nonstatic_concrete_methods) {
6627 _has_nonstatic_concrete_methods = true;
6628 }
6629
6630 // Additional attributes/annotations
6631 _parsed_annotations = new ClassAnnotationCollector();
6632 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6633
6634 assert(_inner_classes != NULL, "invariant");
6635
6636 // Finalize the Annotations metadata object,
6637 // now that all annotation arrays have been created.
6638 create_combined_annotations(CHECK);
6639
6640 // Make sure this is the end of class file stream
6641 guarantee_property(stream->at_eos(),
6642 "Extra bytes at the end of class file %s",
6643 CHECK);
6644
6645 // all bytes in stream read and parsed
6646 }
6647
6648 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6649 ConstantPool* cp,
6650 TRAPS) {
6651 assert(stream != NULL, "invariant");
6652 assert(stream->at_eos(), "invariant");
6653 assert(cp != NULL, "invariant");
6654 assert(_loader_data != NULL, "invariant");
6655
6656 if (_class_name == vmSymbols::java_lang_Object()) {
6657 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6658 "java.lang.Object cannot implement an interface in class file %s",
6659 CHECK);
6660 }
6661 // We check super class after class file is parsed and format is checked
6662 if (_super_class_index > 0 && NULL ==_super_klass) {
6663 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6664 if (_access_flags.is_interface()) {
6665 // Before attempting to resolve the superclass, check for class format
6666 // errors not checked yet.
6667 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6668 "Interfaces must have java.lang.Object as superclass in class file %s",
6669 CHECK);
6670 }
6671 Handle loader(THREAD, _loader_data->class_loader());
6672 _super_klass = (const InstanceKlass*)
6673 SystemDictionary::resolve_super_or_fail(_class_name,
6674 super_class_name,
6675 loader,
6676 _protection_domain,
6677 true,
6678 CHECK);
6679 }
6680
6681 if (_super_klass != NULL) {
6682 if (_super_klass->has_nonstatic_concrete_methods()) {
6683 _has_nonstatic_concrete_methods = true;
6684 }
6685
6686 if (_super_klass->is_interface()) {
6687 ResourceMark rm(THREAD);
6688 Exceptions::fthrow(
6689 THREAD_AND_LOCATION,
6690 vmSymbols::java_lang_IncompatibleClassChangeError(),
6691 "class %s has interface %s as super class",
6692 _class_name->as_klass_external_name(),
6693 _super_klass->external_name()
6694 );
6695 return;
6696 }
6697
6698 // For a value class, only java/lang/Object is an acceptable super class
6699 if (_access_flags.get_flags() & JVM_ACC_VALUE) {
6700 guarantee_property(_super_klass->name() == vmSymbols::java_lang_Object(),
6701 "Value type must have java.lang.Object as superclass in class file %s",
6702 CHECK);
6703 }
6704
6705 // Make sure super class is not final
6706 if (_super_klass->is_final()) {
6707 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6708 }
6709 }
6710
6711 // Compute the transitive list of all unique interfaces implemented by this class
6712 _transitive_interfaces =
6713 compute_transitive_interfaces(_super_klass,
6714 _local_interfaces,
6715 _loader_data,
6716 CHECK);
6717
6718 assert(_transitive_interfaces != NULL, "invariant");
6719
6720 // sort methods
6721 _method_ordering = sort_methods(_methods);
6722
6723 _all_mirandas = new GrowableArray<Method*>(20);
6724
6725 Handle loader(THREAD, _loader_data->class_loader());
6726 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6727 &_num_miranda_methods,
6728 _all_mirandas,
6729 _super_klass,
6730 _methods,
6731 _access_flags,
6732 _major_version,
6733 loader,
6734 _class_name,
6735 _local_interfaces,
6736 CHECK);
6737
6738 // Size of Java itable (in words)
6739 _itable_size = _access_flags.is_interface() ? 0 :
6740 klassItable::compute_itable_size(_transitive_interfaces);
6741
6742 assert(_fac != NULL, "invariant");
6743 assert(_parsed_annotations != NULL, "invariant");
6744
6745 _field_info = new FieldLayoutInfo();
6746 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6747
6748 // Compute reference typ
6749 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6750
6751 }
6752
6753 void ClassFileParser::set_klass(InstanceKlass* klass) {
6754
6755 #ifdef ASSERT
6756 if (klass != NULL) {
6757 assert(NULL == _klass, "leaking?");
6758 }
6759 #endif
6760
6761 _klass = klass;
6762 }
6763
6764 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6765
6766 #ifdef ASSERT
6767 if (klass != NULL) {
6768 assert(NULL == _klass_to_deallocate, "leaking?");
6769 }
6770 #endif
6771
6772 _klass_to_deallocate = klass;
6773 }
6774
6775 // Caller responsible for ResourceMark
6776 // clone stream with rewound position
6777 const ClassFileStream* ClassFileParser::clone_stream() const {
6778 assert(_stream != NULL, "invariant");
6779
6780 return _stream->clone();
6781 }
6782
6783 // ----------------------------------------------------------------------------
6784 // debugging
6785
6786 #ifdef ASSERT
6787
6788 // return true if class_name contains no '.' (internal format is '/')
6789 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6790 if (class_name != NULL) {
6791 ResourceMark rm;
6792 char* name = class_name->as_C_string();
6793 return strchr(name, '.') == NULL;
6794 } else {
6795 return true;
6796 }
6797 }
6798
6799 #endif