1 /*
2 * Copyright (c) 1997, 2017, 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 "gc/shared/gcLocker.hpp"
41 #include "logging/log.hpp"
42 #include "logging/logStream.hpp"
43 #include "memory/allocation.hpp"
44 #include "memory/metadataFactory.hpp"
45 #include "memory/oopFactory.hpp"
46 #include "memory/resourceArea.hpp"
47 #include "memory/universe.inline.hpp"
48 #include "oops/annotations.hpp"
49 #include "oops/fieldStreams.hpp"
50 #include "oops/instanceKlass.hpp"
51 #include "oops/instanceMirrorKlass.hpp"
52 #include "oops/klass.inline.hpp"
53 #include "oops/klassVtable.hpp"
54 #include "oops/metadata.hpp"
55 #include "oops/method.hpp"
56 #include "oops/oop.inline.hpp"
57 #include "oops/symbol.hpp"
58 #include "prims/jvmtiExport.hpp"
59 #include "prims/jvmtiThreadState.hpp"
60 #include "runtime/javaCalls.hpp"
61 #include "runtime/perfData.hpp"
62 #include "runtime/reflection.hpp"
63 #include "runtime/signature.hpp"
64 #include "runtime/timer.hpp"
65 #include "services/classLoadingService.hpp"
66 #include "services/threadService.hpp"
67 #include "trace/traceMacros.hpp"
68 #include "utilities/align.hpp"
69 #include "utilities/bitMap.inline.hpp"
70 #include "utilities/exceptions.hpp"
71 #include "utilities/globalDefinitions.hpp"
72 #include "utilities/growableArray.hpp"
73 #include "utilities/macros.hpp"
74 #include "utilities/ostream.hpp"
75 #include "utilities/resourceHash.hpp"
76 #if INCLUDE_CDS
77 #include "classfile/systemDictionaryShared.hpp"
78 #endif
79
80 // We generally try to create the oops directly when parsing, rather than
81 // allocating temporary data structures and copying the bytes twice. A
82 // temporary area is only needed when parsing utf8 entries in the constant
83 // pool and when parsing line number tables.
84
85 // We add assert in debug mode when class format is not checked.
86
87 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
88 #define JAVA_MIN_SUPPORTED_VERSION 45
89 #define JAVA_MAX_SUPPORTED_VERSION 53
90 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
91
92 // Used for two backward compatibility reasons:
93 // - to check for new additions to the class file format in JDK1.5
94 // - to check for bug fixes in the format checker in JDK1.5
95 #define JAVA_1_5_VERSION 49
96
97 // Used for backward compatibility reasons:
98 // - to check for javac bug fixes that happened after 1.5
99 // - also used as the max version when running in jdk6
100 #define JAVA_6_VERSION 50
101
102 // Used for backward compatibility reasons:
103 // - to disallow argument and require ACC_STATIC for <clinit> methods
104 #define JAVA_7_VERSION 51
105
106 // Extension method support.
107 #define JAVA_8_VERSION 52
108
109 #define JAVA_9_VERSION 53
110
111 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
112 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION,
113 "Unexpected bad constant pool entry");
114 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
115 }
116
117 // FIX ME: update this
118 #define JAVA_10_VERSION 53
119
120 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
121 ConstantPool* cp,
122 const int length,
123 TRAPS) {
124 assert(stream != NULL, "invariant");
125 assert(cp != NULL, "invariant");
126
127 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
128 // this function (_current can be allocated in a register, with scalar
129 // replacement of aggregates). The _current pointer is copied back to
130 // stream() when this function returns. DON'T call another method within
131 // this method that uses stream().
132 const ClassFileStream cfs1 = *stream;
133 const ClassFileStream* const cfs = &cfs1;
134
135 assert(cfs->allocated_on_stack(), "should be local");
136 debug_only(const u1* const old_current = stream->current();)
137
138 // Used for batching symbol allocations.
139 const char* names[SymbolTable::symbol_alloc_batch_size];
140 int lengths[SymbolTable::symbol_alloc_batch_size];
141 int indices[SymbolTable::symbol_alloc_batch_size];
142 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
143 int names_count = 0;
144
145 // parsing Index 0 is unused
146 for (int index = 1; index < length; index++) {
147 // Each of the following case guarantees one more byte in the stream
148 // for the following tag or the access_flags following constant pool,
149 // so we don't need bounds-check for reading tag.
150 const u1 tag = cfs->get_u1_fast();
151 switch (tag) {
152 case JVM_CONSTANT_Class : {
153 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
154 const u2 name_index = cfs->get_u2_fast();
155 cp->klass_index_at_put(index, name_index);
156 break;
157 }
158 case JVM_CONSTANT_Fieldref: {
159 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
160 const u2 class_index = cfs->get_u2_fast();
161 const u2 name_and_type_index = cfs->get_u2_fast();
162 cp->field_at_put(index, class_index, name_and_type_index);
163 break;
164 }
165 case JVM_CONSTANT_Methodref: {
166 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
167 const u2 class_index = cfs->get_u2_fast();
168 const u2 name_and_type_index = cfs->get_u2_fast();
169 cp->method_at_put(index, class_index, name_and_type_index);
170 break;
171 }
172 case JVM_CONSTANT_InterfaceMethodref: {
173 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
174 const u2 class_index = cfs->get_u2_fast();
175 const u2 name_and_type_index = cfs->get_u2_fast();
176 cp->interface_method_at_put(index, class_index, name_and_type_index);
177 break;
178 }
179 case JVM_CONSTANT_String : {
180 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
181 const u2 string_index = cfs->get_u2_fast();
182 cp->string_index_at_put(index, string_index);
183 break;
184 }
185 case JVM_CONSTANT_MethodHandle :
186 case JVM_CONSTANT_MethodType: {
187 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
188 classfile_parse_error(
189 "Class file version does not support constant tag %u in class file %s",
190 tag, CHECK);
191 }
192 if (tag == JVM_CONSTANT_MethodHandle) {
193 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
194 const u1 ref_kind = cfs->get_u1_fast();
195 const u2 method_index = cfs->get_u2_fast();
196 cp->method_handle_index_at_put(index, ref_kind, method_index);
197 }
198 else if (tag == JVM_CONSTANT_MethodType) {
199 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
200 const u2 signature_index = cfs->get_u2_fast();
201 cp->method_type_index_at_put(index, signature_index);
202 }
203 else {
204 ShouldNotReachHere();
205 }
206 break;
207 }
208 case JVM_CONSTANT_InvokeDynamic : {
209 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
210 classfile_parse_error(
211 "Class file version does not support constant tag %u in class file %s",
212 tag, CHECK);
213 }
214 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
215 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
216 const u2 name_and_type_index = cfs->get_u2_fast();
217 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
218 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
219 }
220 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
221 break;
222 }
223 case JVM_CONSTANT_Integer: {
224 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
225 const u4 bytes = cfs->get_u4_fast();
226 cp->int_at_put(index, (jint)bytes);
227 break;
228 }
229 case JVM_CONSTANT_Float: {
230 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
231 const u4 bytes = cfs->get_u4_fast();
232 cp->float_at_put(index, *(jfloat*)&bytes);
233 break;
234 }
235 case JVM_CONSTANT_Long: {
236 // A mangled type might cause you to overrun allocated memory
237 guarantee_property(index + 1 < length,
238 "Invalid constant pool entry %u in class file %s",
239 index,
240 CHECK);
241 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
242 const u8 bytes = cfs->get_u8_fast();
243 cp->long_at_put(index, bytes);
244 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
245 break;
246 }
247 case JVM_CONSTANT_Double: {
248 // A mangled type might cause you to overrun allocated memory
249 guarantee_property(index+1 < length,
250 "Invalid constant pool entry %u in class file %s",
251 index,
252 CHECK);
253 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
254 const u8 bytes = cfs->get_u8_fast();
255 cp->double_at_put(index, *(jdouble*)&bytes);
256 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
257 break;
258 }
259 case JVM_CONSTANT_NameAndType: {
260 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
261 const u2 name_index = cfs->get_u2_fast();
262 const u2 signature_index = cfs->get_u2_fast();
263 cp->name_and_type_at_put(index, name_index, signature_index);
264 break;
265 }
266 case JVM_CONSTANT_Utf8 : {
267 cfs->guarantee_more(2, CHECK); // utf8_length
268 u2 utf8_length = cfs->get_u2_fast();
269 const u1* utf8_buffer = cfs->current();
270 assert(utf8_buffer != NULL, "null utf8 buffer");
271 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
272 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
273 cfs->skip_u1_fast(utf8_length);
274
275 // Before storing the symbol, make sure it's legal
276 if (_need_verify) {
277 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
278 }
279
280 if (has_cp_patch_at(index)) {
281 Handle patch = clear_cp_patch_at(index);
282 guarantee_property(java_lang_String::is_instance(patch()),
283 "Illegal utf8 patch at %d in class file %s",
284 index,
285 CHECK);
286 const char* const str = java_lang_String::as_utf8_string(patch());
287 // (could use java_lang_String::as_symbol instead, but might as well batch them)
288 utf8_buffer = (const u1*) str;
289 utf8_length = (int) strlen(str);
290 }
291
292 unsigned int hash;
293 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
294 utf8_length,
295 hash);
296 if (result == NULL) {
297 names[names_count] = (const char*)utf8_buffer;
298 lengths[names_count] = utf8_length;
299 indices[names_count] = index;
300 hashValues[names_count++] = hash;
301 if (names_count == SymbolTable::symbol_alloc_batch_size) {
302 SymbolTable::new_symbols(_loader_data,
303 cp,
304 names_count,
305 names,
306 lengths,
307 indices,
308 hashValues,
309 CHECK);
310 names_count = 0;
311 }
312 } else {
313 cp->symbol_at_put(index, result);
314 }
315 break;
316 }
317 case 19:
318 case 20: {
319 // Record that an error occurred in these two cases but keep parsing so
320 // that ACC_Module can be checked for in the access_flags. Need to
321 // throw NoClassDefFoundError in that case.
322 if (_major_version >= JAVA_9_VERSION) {
323 cfs->guarantee_more(3, CHECK);
324 cfs->get_u2_fast();
325 set_class_bad_constant_seen(tag);
326 break;
327 }
328 }
329 default: {
330 classfile_parse_error("Unknown constant tag %u in class file %s",
331 tag,
332 CHECK);
333 break;
334 }
335 } // end of switch(tag)
336 } // end of for
337
338 // Allocate the remaining symbols
339 if (names_count > 0) {
340 SymbolTable::new_symbols(_loader_data,
341 cp,
342 names_count,
343 names,
344 lengths,
345 indices,
346 hashValues,
347 CHECK);
348 }
349
350 // Copy _current pointer of local copy back to stream.
351 assert(stream->current() == old_current, "non-exclusive use of stream");
352 stream->set_current(cfs1.current());
353
354 }
355
356 static inline bool valid_cp_range(int index, int length) {
357 return (index > 0 && index < length);
358 }
359
360 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
361 assert(cp != NULL, "invariant");
362 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
363 return cp->symbol_at(index);
364 }
365 return NULL;
366 }
367
368 #ifdef ASSERT
369 PRAGMA_DIAG_PUSH
370 PRAGMA_FORMAT_NONLITERAL_IGNORED
371 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
372 ResourceMark rm(THREAD);
373 fatal(msg, _class_name->as_C_string());
374 }
375
376 void ClassFileParser::report_assert_property_failure(const char* msg,
377 int index,
378 TRAPS) const {
379 ResourceMark rm(THREAD);
380 fatal(msg, index, _class_name->as_C_string());
381 }
382 PRAGMA_DIAG_POP
383 #endif
384
385 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
386 ConstantPool* const cp,
387 const int length,
388 TRAPS) {
389 assert(cp != NULL, "invariant");
390 assert(stream != NULL, "invariant");
391
392 // parsing constant pool entries
393 parse_constant_pool_entries(stream, cp, length, CHECK);
394 if (class_bad_constant_seen() != 0) {
395 // a bad CP entry has been detected previously so stop parsing and just return.
396 return;
397 }
398
399 int index = 1; // declared outside of loops for portability
400 int num_klasses = 0;
401
402 // first verification pass - validate cross references
403 // and fixup class and string constants
404 for (index = 1; index < length; index++) { // Index 0 is unused
405 const jbyte tag = cp->tag_at(index).value();
406 switch (tag) {
407 case JVM_CONSTANT_Class: {
408 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
409 break;
410 }
411 case JVM_CONSTANT_Fieldref:
412 // fall through
413 case JVM_CONSTANT_Methodref:
414 // fall through
415 case JVM_CONSTANT_InterfaceMethodref: {
416 if (!_need_verify) break;
417 const int klass_ref_index = cp->klass_ref_index_at(index);
418 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
419 check_property(valid_klass_reference_at(klass_ref_index),
420 "Invalid constant pool index %u in class file %s",
421 klass_ref_index, CHECK);
422 check_property(valid_cp_range(name_and_type_ref_index, length) &&
423 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
424 "Invalid constant pool index %u in class file %s",
425 name_and_type_ref_index, CHECK);
426 break;
427 }
428 case JVM_CONSTANT_String: {
429 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
430 break;
431 }
432 case JVM_CONSTANT_Integer:
433 break;
434 case JVM_CONSTANT_Float:
435 break;
436 case JVM_CONSTANT_Long:
437 case JVM_CONSTANT_Double: {
438 index++;
439 check_property(
440 (index < length && cp->tag_at(index).is_invalid()),
441 "Improper constant pool long/double index %u in class file %s",
442 index, CHECK);
443 break;
444 }
445 case JVM_CONSTANT_NameAndType: {
446 if (!_need_verify) break;
447 const int name_ref_index = cp->name_ref_index_at(index);
448 const int signature_ref_index = cp->signature_ref_index_at(index);
449 check_property(valid_symbol_at(name_ref_index),
450 "Invalid constant pool index %u in class file %s",
451 name_ref_index, CHECK);
452 check_property(valid_symbol_at(signature_ref_index),
453 "Invalid constant pool index %u in class file %s",
454 signature_ref_index, CHECK);
455 break;
456 }
457 case JVM_CONSTANT_Utf8:
458 break;
459 case JVM_CONSTANT_UnresolvedClass: // fall-through
460 case JVM_CONSTANT_UnresolvedClassInError: {
461 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
462 break;
463 }
464 case JVM_CONSTANT_ClassIndex: {
465 const int class_index = cp->klass_index_at(index);
466 check_property(valid_symbol_at(class_index),
467 "Invalid constant pool index %u in class file %s",
468 class_index, CHECK);
469 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
470 break;
471 }
472 case JVM_CONSTANT_StringIndex: {
473 const int string_index = cp->string_index_at(index);
474 check_property(valid_symbol_at(string_index),
475 "Invalid constant pool index %u in class file %s",
476 string_index, CHECK);
477 Symbol* const sym = cp->symbol_at(string_index);
478 cp->unresolved_string_at_put(index, sym);
479 break;
480 }
481 case JVM_CONSTANT_MethodHandle: {
482 const int ref_index = cp->method_handle_index_at(index);
483 check_property(valid_cp_range(ref_index, length),
484 "Invalid constant pool index %u in class file %s",
485 ref_index, CHECK);
486 const constantTag tag = cp->tag_at(ref_index);
487 const int ref_kind = cp->method_handle_ref_kind_at(index);
488
489 switch (ref_kind) {
490 case JVM_REF_getField:
491 case JVM_REF_getStatic:
492 case JVM_REF_putField:
493 case JVM_REF_putStatic: {
494 check_property(
495 tag.is_field(),
496 "Invalid constant pool index %u in class file %s (not a field)",
497 ref_index, CHECK);
498 break;
499 }
500 case JVM_REF_invokeVirtual:
501 case JVM_REF_newInvokeSpecial: {
502 check_property(
503 tag.is_method(),
504 "Invalid constant pool index %u in class file %s (not a method)",
505 ref_index, CHECK);
506 break;
507 }
508 case JVM_REF_invokeStatic:
509 case JVM_REF_invokeSpecial: {
510 check_property(
511 tag.is_method() ||
512 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
513 "Invalid constant pool index %u in class file %s (not a method)",
514 ref_index, CHECK);
515 break;
516 }
517 case JVM_REF_invokeInterface: {
518 check_property(
519 tag.is_interface_method(),
520 "Invalid constant pool index %u in class file %s (not an interface method)",
521 ref_index, CHECK);
522 break;
523 }
524 default: {
525 classfile_parse_error(
526 "Bad method handle kind at constant pool index %u in class file %s",
527 index, CHECK);
528 }
529 } // switch(refkind)
530 // Keep the ref_index unchanged. It will be indirected at link-time.
531 break;
532 } // case MethodHandle
533 case JVM_CONSTANT_MethodType: {
534 const int ref_index = cp->method_type_index_at(index);
535 check_property(valid_symbol_at(ref_index),
536 "Invalid constant pool index %u in class file %s",
537 ref_index, CHECK);
538 break;
539 }
540 case JVM_CONSTANT_InvokeDynamic: {
541 const int name_and_type_ref_index =
542 cp->invoke_dynamic_name_and_type_ref_index_at(index);
543
544 check_property(valid_cp_range(name_and_type_ref_index, length) &&
545 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
546 "Invalid constant pool index %u in class file %s",
547 name_and_type_ref_index, CHECK);
548 // bootstrap specifier index must be checked later,
549 // when BootstrapMethods attr is available
550 break;
551 }
552 default: {
553 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
554 ShouldNotReachHere();
555 break;
556 }
557 } // switch(tag)
558 } // end of for
559
560 _first_patched_klass_resolved_index = num_klasses;
561 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
562
563 if (_cp_patches != NULL) {
564 // need to treat this_class specially...
565
566 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
567 // for now. These will be replaced with actual names of the patched classes in patch_class().
568 Symbol* s = vmSymbols::star_name();
569 for (int n=_orig_cp_size; n<cp->length(); n++) {
570 cp->symbol_at_put(n, s);
571 }
572
573 int this_class_index;
574 {
575 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
576 const u1* const mark = stream->current();
577 stream->skip_u2_fast(1); // skip flags
578 this_class_index = stream->get_u2_fast();
579 stream->set_current(mark); // revert to mark
580 }
581
582 for (index = 1; index < length; index++) { // Index 0 is unused
583 if (has_cp_patch_at(index)) {
584 guarantee_property(index != this_class_index,
585 "Illegal constant pool patch to self at %d in class file %s",
586 index, CHECK);
587 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
588 }
589 }
590 }
591
592 if (!_need_verify) {
593 return;
594 }
595
596 // second verification pass - checks the strings are of the right format.
597 // but not yet to the other entries
598 for (index = 1; index < length; index++) {
599 const jbyte tag = cp->tag_at(index).value();
600 switch (tag) {
601 case JVM_CONSTANT_UnresolvedClass: {
602 const Symbol* const class_name = cp->klass_name_at(index);
603 // check the name, even if _cp_patches will overwrite it
604 verify_legal_class_name(class_name, CHECK);
605 break;
606 }
607 case JVM_CONSTANT_NameAndType: {
608 if (_need_verify) {
609 const int sig_index = cp->signature_ref_index_at(index);
610 const int name_index = cp->name_ref_index_at(index);
611 const Symbol* const name = cp->symbol_at(name_index);
612 const Symbol* const sig = cp->symbol_at(sig_index);
613 guarantee_property(sig->utf8_length() != 0,
614 "Illegal zero length constant pool entry at %d in class %s",
615 sig_index, CHECK);
616 guarantee_property(name->utf8_length() != 0,
617 "Illegal zero length constant pool entry at %d in class %s",
618 name_index, CHECK);
619
620 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
621 // Format check method name and signature
622 verify_legal_method_name(name, CHECK);
623 verify_legal_method_signature(name, sig, CHECK);
624 } else {
625 // Format check field name and signature
626 verify_legal_field_name(name, CHECK);
627 verify_legal_field_signature(name, sig, CHECK);
628 }
629 }
630 break;
631 }
632 case JVM_CONSTANT_InvokeDynamic:
633 case JVM_CONSTANT_Fieldref:
634 case JVM_CONSTANT_Methodref:
635 case JVM_CONSTANT_InterfaceMethodref: {
636 const int name_and_type_ref_index =
637 cp->name_and_type_ref_index_at(index);
638 // already verified to be utf8
639 const int name_ref_index =
640 cp->name_ref_index_at(name_and_type_ref_index);
641 // already verified to be utf8
642 const int signature_ref_index =
643 cp->signature_ref_index_at(name_and_type_ref_index);
644 const Symbol* const name = cp->symbol_at(name_ref_index);
645 const Symbol* const signature = cp->symbol_at(signature_ref_index);
646 if (tag == JVM_CONSTANT_Fieldref) {
647 if (_need_verify) {
648 // Field name and signature are verified above, when iterating NameAndType_info.
649 // Need only to be sure signature is non-zero length and the right type.
650 if (signature->utf8_length() == 0 ||
651 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
652 throwIllegalSignature("Field", name, signature, CHECK);
653 }
654 }
655 } else {
656 if (_need_verify) {
657 // Method name and signature are verified above, when iterating NameAndType_info.
658 // Need only to be sure signature is non-zero length and the right type.
659 if (signature->utf8_length() == 0 ||
660 signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
661 throwIllegalSignature("Method", name, signature, CHECK);
662 }
663 }
664 // 4509014: If a class method name begins with '<', it must be "<init>"
665 const unsigned int name_len = name->utf8_length();
666 if (tag == JVM_CONSTANT_Methodref &&
667 name_len != 0 &&
668 name->byte_at(0) == '<' &&
669 name != vmSymbols::object_initializer_name()) {
670 classfile_parse_error(
671 "Bad method name at constant pool index %u in class file %s",
672 name_ref_index, CHECK);
673 }
674 }
675 break;
676 }
677 case JVM_CONSTANT_MethodHandle: {
678 const int ref_index = cp->method_handle_index_at(index);
679 const int ref_kind = cp->method_handle_ref_kind_at(index);
680 switch (ref_kind) {
681 case JVM_REF_invokeVirtual:
682 case JVM_REF_invokeStatic:
683 case JVM_REF_invokeSpecial:
684 case JVM_REF_newInvokeSpecial: {
685 const int name_and_type_ref_index =
686 cp->name_and_type_ref_index_at(ref_index);
687 const int name_ref_index =
688 cp->name_ref_index_at(name_and_type_ref_index);
689 const Symbol* const name = cp->symbol_at(name_ref_index);
690 if (ref_kind == JVM_REF_newInvokeSpecial) {
691 if (name != vmSymbols::object_initializer_name()) {
692 classfile_parse_error(
693 "Bad constructor name at constant pool index %u in class file %s",
694 name_ref_index, CHECK);
695 }
696 } else {
697 if (name == vmSymbols::object_initializer_name()) {
698 classfile_parse_error(
699 "Bad method name at constant pool index %u in class file %s",
700 name_ref_index, CHECK);
701 }
702 }
703 break;
704 }
705 // Other ref_kinds are already fully checked in previous pass.
706 } // switch(ref_kind)
707 break;
708 }
709 case JVM_CONSTANT_MethodType: {
710 const Symbol* const no_name = vmSymbols::type_name(); // place holder
711 const Symbol* const signature = cp->method_type_signature_at(index);
712 verify_legal_method_signature(no_name, signature, CHECK);
713 break;
714 }
715 case JVM_CONSTANT_Utf8: {
716 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
717 }
718 } // switch(tag)
719 } // end of for
720 }
721
722 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
723 int name_index = _orig_cp_size + _num_patched_klasses;
724 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
725
726 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
727 _num_patched_klasses ++;
728 }
729
730 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
731 int index,
732 Handle patch,
733 TRAPS) {
734 assert(cp != NULL, "invariant");
735
736 BasicType patch_type = T_VOID;
737
738 switch (cp->tag_at(index).value()) {
739
740 case JVM_CONSTANT_UnresolvedClass: {
741 // Patching a class means pre-resolving it.
742 // The name in the constant pool is ignored.
743 if (java_lang_Class::is_instance(patch())) {
744 guarantee_property(!java_lang_Class::is_primitive(patch()),
745 "Illegal class patch at %d in class file %s",
746 index, CHECK);
747 Klass* k = java_lang_Class::as_Klass(patch());
748 patch_class(cp, index, k, k->name());
749 } else {
750 guarantee_property(java_lang_String::is_instance(patch()),
751 "Illegal class patch at %d in class file %s",
752 index, CHECK);
753 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK);
754 patch_class(cp, index, NULL, name);
755 }
756 break;
757 }
758
759 case JVM_CONSTANT_String: {
760 // skip this patch and don't clear it. Needs the oop array for resolved
761 // references to be created first.
762 return;
763 }
764 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
765 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
766 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
767 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
768 patch_prim:
769 {
770 jvalue value;
771 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
772 guarantee_property(value_type == patch_type,
773 "Illegal primitive patch at %d in class file %s",
774 index, CHECK);
775 switch (value_type) {
776 case T_INT: cp->int_at_put(index, value.i); break;
777 case T_FLOAT: cp->float_at_put(index, value.f); break;
778 case T_LONG: cp->long_at_put(index, value.j); break;
779 case T_DOUBLE: cp->double_at_put(index, value.d); break;
780 default: assert(false, "");
781 }
782 } // end patch_prim label
783 break;
784
785 default: {
786 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
787 guarantee_property(!has_cp_patch_at(index),
788 "Illegal unexpected patch at %d in class file %s",
789 index, CHECK);
790 return;
791 }
792 } // end of switch(tag)
793
794 // On fall-through, mark the patch as used.
795 clear_cp_patch_at(index);
796 }
797 class NameSigHash: public ResourceObj {
798 public:
799 const Symbol* _name; // name
800 const Symbol* _sig; // signature
801 NameSigHash* _next; // Next entry in hash table
802 };
803
804 static const int HASH_ROW_SIZE = 256;
805
806 static unsigned int hash(const Symbol* name, const Symbol* sig) {
807 unsigned int raw_hash = 0;
808 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
809 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
810
811 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
812 }
813
814
815 static void initialize_hashtable(NameSigHash** table) {
816 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
817 }
818 // Return false if the name/sig combination is found in table.
819 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
820 // The old format checker uses heap sort to find duplicates.
821 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
822 // of table since we don't expect Symbol*'s to move.
823 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
824 assert(name != NULL, "name in constant pool is NULL");
825
826 // First lookup for duplicates
827 int index = hash(name, sig);
828 NameSigHash* entry = table[index];
829 while (entry != NULL) {
830 if (entry->_name == name && entry->_sig == sig) {
831 return false;
832 }
833 entry = entry->_next;
834 }
835
836 // No duplicate is found, allocate a new entry and fill it.
837 entry = new NameSigHash();
838 entry->_name = name;
839 entry->_sig = sig;
840
841 // Insert into hash table
842 entry->_next = table[index];
843 table[index] = entry;
844
845 return true;
846 }
847
848 // Side-effects: populates the _local_interfaces field
849 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
850 const int itfs_len,
851 ConstantPool* const cp,
852 bool* const has_nonstatic_concrete_methods,
853 TRAPS) {
854 assert(stream != NULL, "invariant");
855 assert(cp != NULL, "invariant");
856 assert(has_nonstatic_concrete_methods != NULL, "invariant");
857
858 if (itfs_len == 0) {
859 _local_interfaces = Universe::the_empty_klass_array();
860 } else {
861 assert(itfs_len > 0, "only called for len>0");
862 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, itfs_len, NULL, CHECK);
863
864 int index;
865 for (index = 0; index < itfs_len; index++) {
866 const u2 interface_index = stream->get_u2(CHECK);
867 Klass* interf;
868 check_property(
869 valid_klass_reference_at(interface_index),
870 "Interface name has bad constant pool index %u in class file %s",
871 interface_index, CHECK);
872 if (cp->tag_at(interface_index).is_klass()) {
873 interf = cp->resolved_klass_at(interface_index);
874 } else {
875 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
876
877 // Don't need to check legal name because it's checked when parsing constant pool.
878 // But need to make sure it's not an array type.
879 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
880 "Bad interface name in class file %s", CHECK);
881
882 // Call resolve_super so classcircularity is checked
883 interf = SystemDictionary::resolve_super_or_fail(
884 _class_name,
885 unresolved_klass,
886 Handle(THREAD, _loader_data->class_loader()),
887 _protection_domain,
888 false,
889 CHECK);
890 }
891
892 if (!interf->is_interface()) {
893 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
894 "Implementing class");
895 }
896
897 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
898 *has_nonstatic_concrete_methods = true;
899 }
900 _local_interfaces->at_put(index, interf);
901 }
902
903 if (!_need_verify || itfs_len <= 1) {
904 return;
905 }
906
907 // Check if there's any duplicates in interfaces
908 ResourceMark rm(THREAD);
909 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
910 NameSigHash*,
911 HASH_ROW_SIZE);
912 initialize_hashtable(interface_names);
913 bool dup = false;
914 const Symbol* name = NULL;
915 {
916 debug_only(NoSafepointVerifier nsv;)
917 for (index = 0; index < itfs_len; index++) {
918 const Klass* const k = _local_interfaces->at(index);
919 name = InstanceKlass::cast(k)->name();
920 // If no duplicates, add (name, NULL) in hashtable interface_names.
921 if (!put_after_lookup(name, NULL, interface_names)) {
922 dup = true;
923 break;
924 }
925 }
926 }
927 if (dup) {
928 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
929 name->as_C_string(), CHECK);
930 }
931 }
932 }
933
934 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
935 int constantvalue_index,
936 int signature_index,
937 TRAPS) const {
938 // Make sure the constant pool entry is of a type appropriate to this field
939 guarantee_property(
940 (constantvalue_index > 0 &&
941 constantvalue_index < cp->length()),
942 "Bad initial value index %u in ConstantValue attribute in class file %s",
943 constantvalue_index, CHECK);
944
945 const constantTag value_type = cp->tag_at(constantvalue_index);
946 switch(cp->basic_type_for_signature_at(signature_index)) {
947 case T_LONG: {
948 guarantee_property(value_type.is_long(),
949 "Inconsistent constant value type in class file %s",
950 CHECK);
951 break;
952 }
953 case T_FLOAT: {
954 guarantee_property(value_type.is_float(),
955 "Inconsistent constant value type in class file %s",
956 CHECK);
957 break;
958 }
959 case T_DOUBLE: {
960 guarantee_property(value_type.is_double(),
961 "Inconsistent constant value type in class file %s",
962 CHECK);
963 break;
964 }
965 case T_BYTE:
966 case T_CHAR:
967 case T_SHORT:
968 case T_BOOLEAN:
969 case T_INT: {
970 guarantee_property(value_type.is_int(),
971 "Inconsistent constant value type in class file %s",
972 CHECK);
973 break;
974 }
975 case T_OBJECT: {
976 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
977 && value_type.is_string()),
978 "Bad string initial value in class file %s",
979 CHECK);
980 break;
981 }
982 default: {
983 classfile_parse_error("Unable to set initial value %u in class file %s",
984 constantvalue_index,
985 CHECK);
986 }
987 }
988 }
989
990 class AnnotationCollector : public ResourceObj{
991 public:
992 enum Location { _in_field, _in_method, _in_class };
993 enum ID {
994 _unknown = 0,
995 _method_CallerSensitive,
996 _method_ForceInline,
997 _method_DontInline,
998 _method_InjectedProfile,
999 _method_LambdaForm_Compiled,
1000 _method_LambdaForm_Hidden,
1001 _method_HotSpotIntrinsicCandidate,
1002 _jdk_internal_vm_annotation_Contended,
1003 _field_Stable,
1004 _jdk_internal_vm_annotation_ReservedStackAccess,
1005 _annotation_LIMIT
1006 };
1007 const Location _location;
1008 int _annotations_present;
1009 u2 _contended_group;
1010
1011 AnnotationCollector(Location location)
1012 : _location(location), _annotations_present(0)
1013 {
1014 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1015 }
1016 // If this annotation name has an ID, report it (or _none).
1017 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1018 // Set the annotation name:
1019 void set_annotation(ID id) {
1020 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1021 _annotations_present |= nth_bit((int)id);
1022 }
1023
1024 void remove_annotation(ID id) {
1025 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1026 _annotations_present &= ~nth_bit((int)id);
1027 }
1028
1029 // Report if the annotation is present.
1030 bool has_any_annotations() const { return _annotations_present != 0; }
1031 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1032
1033 void set_contended_group(u2 group) { _contended_group = group; }
1034 u2 contended_group() const { return _contended_group; }
1035
1036 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1037
1038 void set_stable(bool stable) { set_annotation(_field_Stable); }
1039 bool is_stable() const { return has_annotation(_field_Stable); }
1040 };
1041
1042 // This class also doubles as a holder for metadata cleanup.
1043 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1044 private:
1045 ClassLoaderData* _loader_data;
1046 AnnotationArray* _field_annotations;
1047 AnnotationArray* _field_type_annotations;
1048 public:
1049 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1050 AnnotationCollector(_in_field),
1051 _loader_data(loader_data),
1052 _field_annotations(NULL),
1053 _field_type_annotations(NULL) {}
1054 ~FieldAnnotationCollector();
1055 void apply_to(FieldInfo* f);
1056 AnnotationArray* field_annotations() { return _field_annotations; }
1057 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1058
1059 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1060 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1061 };
1062
1063 class MethodAnnotationCollector : public AnnotationCollector{
1064 public:
1065 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1066 void apply_to(const methodHandle& m);
1067 };
1068
1069 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1070 public:
1071 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1072 void apply_to(InstanceKlass* ik);
1073 };
1074
1075
1076 static int skip_annotation_value(const u1*, int, int); // fwd decl
1077
1078 // Safely increment index by val if does not pass limit
1079 #define SAFE_ADD(index, limit, val) \
1080 if (index >= limit - val) return limit; \
1081 index += val;
1082
1083 // Skip an annotation. Return >=limit if there is any problem.
1084 static int skip_annotation(const u1* buffer, int limit, int index) {
1085 assert(buffer != NULL, "invariant");
1086 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1087 // value := switch (tag:u1) { ... }
1088 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1089 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1090 while (--nmem >= 0 && index < limit) {
1091 SAFE_ADD(index, limit, 2); // skip member
1092 index = skip_annotation_value(buffer, limit, index);
1093 }
1094 return index;
1095 }
1096
1097 // Skip an annotation value. Return >=limit if there is any problem.
1098 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1099 assert(buffer != NULL, "invariant");
1100
1101 // value := switch (tag:u1) {
1102 // case B, C, I, S, Z, D, F, J, c: con:u2;
1103 // case e: e_class:u2 e_name:u2;
1104 // case s: s_con:u2;
1105 // case [: do(nval:u2) {value};
1106 // case @: annotation;
1107 // case s: s_con:u2;
1108 // }
1109 SAFE_ADD(index, limit, 1); // read tag
1110 const u1 tag = buffer[index - 1];
1111 switch (tag) {
1112 case 'B':
1113 case 'C':
1114 case 'I':
1115 case 'S':
1116 case 'Z':
1117 case 'D':
1118 case 'F':
1119 case 'J':
1120 case 'c':
1121 case 's':
1122 SAFE_ADD(index, limit, 2); // skip con or s_con
1123 break;
1124 case 'e':
1125 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1126 break;
1127 case '[':
1128 {
1129 SAFE_ADD(index, limit, 2); // read nval
1130 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1131 while (--nval >= 0 && index < limit) {
1132 index = skip_annotation_value(buffer, limit, index);
1133 }
1134 }
1135 break;
1136 case '@':
1137 index = skip_annotation(buffer, limit, index);
1138 break;
1139 default:
1140 return limit; // bad tag byte
1141 }
1142 return index;
1143 }
1144
1145 // Sift through annotations, looking for those significant to the VM:
1146 static void parse_annotations(const ConstantPool* const cp,
1147 const u1* buffer, int limit,
1148 AnnotationCollector* coll,
1149 ClassLoaderData* loader_data,
1150 TRAPS) {
1151
1152 assert(cp != NULL, "invariant");
1153 assert(buffer != NULL, "invariant");
1154 assert(coll != NULL, "invariant");
1155 assert(loader_data != NULL, "invariant");
1156
1157 // annotations := do(nann:u2) {annotation}
1158 int index = 2; // read nann
1159 if (index >= limit) return;
1160 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1161 enum { // initial annotation layout
1162 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1163 count_off = 2, // u2 such as 1 (one value)
1164 member_off = 4, // utf8 such as 'value'
1165 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1166 e_tag_val = 'e',
1167 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1168 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1169 e_size = 11, // end of 'e' annotation
1170 c_tag_val = 'c', // payload is type
1171 c_con_off = 7, // utf8 payload, such as 'I'
1172 c_size = 9, // end of 'c' annotation
1173 s_tag_val = 's', // payload is String
1174 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1175 s_size = 9,
1176 min_size = 6 // smallest possible size (zero members)
1177 };
1178 // Cannot add min_size to index in case of overflow MAX_INT
1179 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1180 int index0 = index;
1181 index = skip_annotation(buffer, limit, index);
1182 const u1* const abase = buffer + index0;
1183 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1184 const int count = Bytes::get_Java_u2((address)abase + count_off);
1185 const Symbol* const aname = check_symbol_at(cp, atype);
1186 if (aname == NULL) break; // invalid annotation name
1187 const Symbol* member = NULL;
1188 if (count >= 1) {
1189 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1190 member = check_symbol_at(cp, member_index);
1191 if (member == NULL) break; // invalid member name
1192 }
1193
1194 // Here is where parsing particular annotations will take place.
1195 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1196 if (AnnotationCollector::_unknown == id) continue;
1197 coll->set_annotation(id);
1198
1199 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1200 // @Contended can optionally specify the contention group.
1201 //
1202 // Contended group defines the equivalence class over the fields:
1203 // the fields within the same contended group are not treated distinct.
1204 // The only exception is default group, which does not incur the
1205 // equivalence. Naturally, contention group for classes is meaningless.
1206 //
1207 // While the contention group is specified as String, annotation
1208 // values are already interned, and we might as well use the constant
1209 // pool index as the group tag.
1210 //
1211 u2 group_index = 0; // default contended group
1212 if (count == 1
1213 && s_size == (index - index0) // match size
1214 && s_tag_val == *(abase + tag_off)
1215 && member == vmSymbols::value_name()) {
1216 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1217 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1218 group_index = 0; // default contended group
1219 }
1220 }
1221 coll->set_contended_group(group_index);
1222 }
1223 }
1224 }
1225
1226
1227 // Parse attributes for a field.
1228 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1229 u2 attributes_count,
1230 bool is_static, u2 signature_index,
1231 u2* const constantvalue_index_addr,
1232 bool* const is_synthetic_addr,
1233 u2* const generic_signature_index_addr,
1234 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1235 TRAPS) {
1236 assert(cfs != NULL, "invariant");
1237 assert(constantvalue_index_addr != NULL, "invariant");
1238 assert(is_synthetic_addr != NULL, "invariant");
1239 assert(generic_signature_index_addr != NULL, "invariant");
1240 assert(parsed_annotations != NULL, "invariant");
1241 assert(attributes_count > 0, "attributes_count should be greater than 0");
1242
1243 u2 constantvalue_index = 0;
1244 u2 generic_signature_index = 0;
1245 bool is_synthetic = false;
1246 const u1* runtime_visible_annotations = NULL;
1247 int runtime_visible_annotations_length = 0;
1248 const u1* runtime_invisible_annotations = NULL;
1249 int runtime_invisible_annotations_length = 0;
1250 const u1* runtime_visible_type_annotations = NULL;
1251 int runtime_visible_type_annotations_length = 0;
1252 const u1* runtime_invisible_type_annotations = NULL;
1253 int runtime_invisible_type_annotations_length = 0;
1254 bool runtime_invisible_annotations_exists = false;
1255 bool runtime_invisible_type_annotations_exists = false;
1256 const ConstantPool* const cp = _cp;
1257
1258 while (attributes_count--) {
1259 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1260 const u2 attribute_name_index = cfs->get_u2_fast();
1261 const u4 attribute_length = cfs->get_u4_fast();
1262 check_property(valid_symbol_at(attribute_name_index),
1263 "Invalid field attribute index %u in class file %s",
1264 attribute_name_index,
1265 CHECK);
1266
1267 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1268 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1269 // ignore if non-static
1270 if (constantvalue_index != 0) {
1271 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1272 }
1273 check_property(
1274 attribute_length == 2,
1275 "Invalid ConstantValue field attribute length %u in class file %s",
1276 attribute_length, CHECK);
1277
1278 constantvalue_index = cfs->get_u2(CHECK);
1279 if (_need_verify) {
1280 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1281 }
1282 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1283 if (attribute_length != 0) {
1284 classfile_parse_error(
1285 "Invalid Synthetic field attribute length %u in class file %s",
1286 attribute_length, CHECK);
1287 }
1288 is_synthetic = true;
1289 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1290 if (attribute_length != 0) {
1291 classfile_parse_error(
1292 "Invalid Deprecated field attribute length %u in class file %s",
1293 attribute_length, CHECK);
1294 }
1295 } else if (_major_version >= JAVA_1_5_VERSION) {
1296 if (attribute_name == vmSymbols::tag_signature()) {
1297 if (generic_signature_index != 0) {
1298 classfile_parse_error(
1299 "Multiple Signature attributes for field in class file %s", CHECK);
1300 }
1301 if (attribute_length != 2) {
1302 classfile_parse_error(
1303 "Wrong size %u for field's Signature attribute in class file %s",
1304 attribute_length, CHECK);
1305 }
1306 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1307 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1308 if (runtime_visible_annotations != NULL) {
1309 classfile_parse_error(
1310 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1311 }
1312 runtime_visible_annotations_length = attribute_length;
1313 runtime_visible_annotations = cfs->current();
1314 assert(runtime_visible_annotations != NULL, "null visible annotations");
1315 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1316 parse_annotations(cp,
1317 runtime_visible_annotations,
1318 runtime_visible_annotations_length,
1319 parsed_annotations,
1320 _loader_data,
1321 CHECK);
1322 cfs->skip_u1_fast(runtime_visible_annotations_length);
1323 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1324 if (runtime_invisible_annotations_exists) {
1325 classfile_parse_error(
1326 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1327 }
1328 runtime_invisible_annotations_exists = true;
1329 if (PreserveAllAnnotations) {
1330 runtime_invisible_annotations_length = attribute_length;
1331 runtime_invisible_annotations = cfs->current();
1332 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1333 }
1334 cfs->skip_u1(attribute_length, CHECK);
1335 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1336 if (runtime_visible_type_annotations != NULL) {
1337 classfile_parse_error(
1338 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1339 }
1340 runtime_visible_type_annotations_length = attribute_length;
1341 runtime_visible_type_annotations = cfs->current();
1342 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1343 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1344 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1345 if (runtime_invisible_type_annotations_exists) {
1346 classfile_parse_error(
1347 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1348 } else {
1349 runtime_invisible_type_annotations_exists = true;
1350 }
1351 if (PreserveAllAnnotations) {
1352 runtime_invisible_type_annotations_length = attribute_length;
1353 runtime_invisible_type_annotations = cfs->current();
1354 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1355 }
1356 cfs->skip_u1(attribute_length, CHECK);
1357 } else {
1358 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1359 }
1360 } else {
1361 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1362 }
1363 }
1364
1365 *constantvalue_index_addr = constantvalue_index;
1366 *is_synthetic_addr = is_synthetic;
1367 *generic_signature_index_addr = generic_signature_index;
1368 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1369 runtime_visible_annotations_length,
1370 runtime_invisible_annotations,
1371 runtime_invisible_annotations_length,
1372 CHECK);
1373 parsed_annotations->set_field_annotations(a);
1374 a = assemble_annotations(runtime_visible_type_annotations,
1375 runtime_visible_type_annotations_length,
1376 runtime_invisible_type_annotations,
1377 runtime_invisible_type_annotations_length,
1378 CHECK);
1379 parsed_annotations->set_field_type_annotations(a);
1380 return;
1381 }
1382
1383
1384 // Field allocation types. Used for computing field offsets.
1385
1386 enum FieldAllocationType {
1387 STATIC_OOP, // Oops
1388 STATIC_BYTE, // Boolean, Byte, char
1389 STATIC_SHORT, // shorts
1390 STATIC_WORD, // ints
1391 STATIC_DOUBLE, // aligned long or double
1392 NONSTATIC_OOP,
1393 NONSTATIC_BYTE,
1394 NONSTATIC_SHORT,
1395 NONSTATIC_WORD,
1396 NONSTATIC_DOUBLE,
1397 MAX_FIELD_ALLOCATION_TYPE,
1398 BAD_ALLOCATION_TYPE = -1
1399 };
1400
1401 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1402 BAD_ALLOCATION_TYPE, // 0
1403 BAD_ALLOCATION_TYPE, // 1
1404 BAD_ALLOCATION_TYPE, // 2
1405 BAD_ALLOCATION_TYPE, // 3
1406 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1407 NONSTATIC_SHORT, // T_CHAR = 5,
1408 NONSTATIC_WORD, // T_FLOAT = 6,
1409 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1410 NONSTATIC_BYTE, // T_BYTE = 8,
1411 NONSTATIC_SHORT, // T_SHORT = 9,
1412 NONSTATIC_WORD, // T_INT = 10,
1413 NONSTATIC_DOUBLE, // T_LONG = 11,
1414 NONSTATIC_OOP, // T_OBJECT = 12,
1415 NONSTATIC_OOP, // T_ARRAY = 13,
1416 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1417 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1418 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1419 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1420 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1421 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1422 BAD_ALLOCATION_TYPE, // 0
1423 BAD_ALLOCATION_TYPE, // 1
1424 BAD_ALLOCATION_TYPE, // 2
1425 BAD_ALLOCATION_TYPE, // 3
1426 STATIC_BYTE , // T_BOOLEAN = 4,
1427 STATIC_SHORT, // T_CHAR = 5,
1428 STATIC_WORD, // T_FLOAT = 6,
1429 STATIC_DOUBLE, // T_DOUBLE = 7,
1430 STATIC_BYTE, // T_BYTE = 8,
1431 STATIC_SHORT, // T_SHORT = 9,
1432 STATIC_WORD, // T_INT = 10,
1433 STATIC_DOUBLE, // T_LONG = 11,
1434 STATIC_OOP, // T_OBJECT = 12,
1435 STATIC_OOP, // T_ARRAY = 13,
1436 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1437 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1438 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1439 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1440 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1441 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1442 };
1443
1444 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1445 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1446 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1447 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1448 return result;
1449 }
1450
1451 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1452 public:
1453 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1454
1455 FieldAllocationCount() {
1456 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1457 count[i] = 0;
1458 }
1459 }
1460
1461 FieldAllocationType update(bool is_static, BasicType type) {
1462 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1463 if (atype != BAD_ALLOCATION_TYPE) {
1464 // Make sure there is no overflow with injected fields.
1465 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1466 count[atype]++;
1467 }
1468 return atype;
1469 }
1470 };
1471
1472 // Side-effects: populates the _fields, _fields_annotations,
1473 // _fields_type_annotations fields
1474 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1475 bool is_interface,
1476 FieldAllocationCount* const fac,
1477 ConstantPool* cp,
1478 const int cp_size,
1479 u2* const java_fields_count_ptr,
1480 TRAPS) {
1481
1482 assert(cfs != NULL, "invariant");
1483 assert(fac != NULL, "invariant");
1484 assert(cp != NULL, "invariant");
1485 assert(java_fields_count_ptr != NULL, "invariant");
1486
1487 assert(NULL == _fields, "invariant");
1488 assert(NULL == _fields_annotations, "invariant");
1489 assert(NULL == _fields_type_annotations, "invariant");
1490
1491 cfs->guarantee_more(2, CHECK); // length
1492 const u2 length = cfs->get_u2_fast();
1493 *java_fields_count_ptr = length;
1494
1495 int num_injected = 0;
1496 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1497 &num_injected);
1498 const int total_fields = length + num_injected;
1499
1500 // The field array starts with tuples of shorts
1501 // [access, name index, sig index, initial value index, byte offset].
1502 // A generic signature slot only exists for field with generic
1503 // signature attribute. And the access flag is set with
1504 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1505 // signature slots are at the end of the field array and after all
1506 // other fields data.
1507 //
1508 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1509 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1510 // ...
1511 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1512 // [generic signature index]
1513 // [generic signature index]
1514 // ...
1515 //
1516 // Allocate a temporary resource array for field data. For each field,
1517 // a slot is reserved in the temporary array for the generic signature
1518 // index. After parsing all fields, the data are copied to a permanent
1519 // array and any unused slots will be discarded.
1520 ResourceMark rm(THREAD);
1521 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1522 u2,
1523 total_fields * (FieldInfo::field_slots + 1));
1524
1525 // The generic signature slots start after all other fields' data.
1526 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1527 int num_generic_signature = 0;
1528 for (int n = 0; n < length; n++) {
1529 // access_flags, name_index, descriptor_index, attributes_count
1530 cfs->guarantee_more(8, CHECK);
1531
1532 AccessFlags access_flags;
1533 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1534 verify_legal_field_modifiers(flags, is_interface, CHECK);
1535 access_flags.set_flags(flags);
1536
1537 const u2 name_index = cfs->get_u2_fast();
1538 check_property(valid_symbol_at(name_index),
1539 "Invalid constant pool index %u for field name in class file %s",
1540 name_index, CHECK);
1541 const Symbol* const name = cp->symbol_at(name_index);
1542 verify_legal_field_name(name, CHECK);
1543
1544 const u2 signature_index = cfs->get_u2_fast();
1545 check_property(valid_symbol_at(signature_index),
1546 "Invalid constant pool index %u for field signature in class file %s",
1547 signature_index, CHECK);
1548 const Symbol* const sig = cp->symbol_at(signature_index);
1549 verify_legal_field_signature(name, sig, CHECK);
1550
1551 u2 constantvalue_index = 0;
1552 bool is_synthetic = false;
1553 u2 generic_signature_index = 0;
1554 const bool is_static = access_flags.is_static();
1555 FieldAnnotationCollector parsed_annotations(_loader_data);
1556
1557 const u2 attributes_count = cfs->get_u2_fast();
1558 if (attributes_count > 0) {
1559 parse_field_attributes(cfs,
1560 attributes_count,
1561 is_static,
1562 signature_index,
1563 &constantvalue_index,
1564 &is_synthetic,
1565 &generic_signature_index,
1566 &parsed_annotations,
1567 CHECK);
1568
1569 if (parsed_annotations.field_annotations() != NULL) {
1570 if (_fields_annotations == NULL) {
1571 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1572 _loader_data, length, NULL,
1573 CHECK);
1574 }
1575 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1576 parsed_annotations.set_field_annotations(NULL);
1577 }
1578 if (parsed_annotations.field_type_annotations() != NULL) {
1579 if (_fields_type_annotations == NULL) {
1580 _fields_type_annotations =
1581 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1582 length,
1583 NULL,
1584 CHECK);
1585 }
1586 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1587 parsed_annotations.set_field_type_annotations(NULL);
1588 }
1589
1590 if (is_synthetic) {
1591 access_flags.set_is_synthetic();
1592 }
1593 if (generic_signature_index != 0) {
1594 access_flags.set_field_has_generic_signature();
1595 fa[generic_signature_slot] = generic_signature_index;
1596 generic_signature_slot ++;
1597 num_generic_signature ++;
1598 }
1599 }
1600
1601 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1602 field->initialize(access_flags.as_short(),
1603 name_index,
1604 signature_index,
1605 constantvalue_index);
1606 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1607
1608 // Remember how many oops we encountered and compute allocation type
1609 const FieldAllocationType atype = fac->update(is_static, type);
1610 field->set_allocation_type(atype);
1611
1612 // After field is initialized with type, we can augment it with aux info
1613 if (parsed_annotations.has_any_annotations())
1614 parsed_annotations.apply_to(field);
1615 }
1616
1617 int index = length;
1618 if (num_injected != 0) {
1619 for (int n = 0; n < num_injected; n++) {
1620 // Check for duplicates
1621 if (injected[n].may_be_java) {
1622 const Symbol* const name = injected[n].name();
1623 const Symbol* const signature = injected[n].signature();
1624 bool duplicate = false;
1625 for (int i = 0; i < length; i++) {
1626 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1627 if (name == cp->symbol_at(f->name_index()) &&
1628 signature == cp->symbol_at(f->signature_index())) {
1629 // Symbol is desclared in Java so skip this one
1630 duplicate = true;
1631 break;
1632 }
1633 }
1634 if (duplicate) {
1635 // These will be removed from the field array at the end
1636 continue;
1637 }
1638 }
1639
1640 // Injected field
1641 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1642 field->initialize(JVM_ACC_FIELD_INTERNAL,
1643 injected[n].name_index,
1644 injected[n].signature_index,
1645 0);
1646
1647 const BasicType type = FieldType::basic_type(injected[n].signature());
1648
1649 // Remember how many oops we encountered and compute allocation type
1650 const FieldAllocationType atype = fac->update(false, type);
1651 field->set_allocation_type(atype);
1652 index++;
1653 }
1654 }
1655
1656 assert(NULL == _fields, "invariant");
1657
1658 _fields =
1659 MetadataFactory::new_array<u2>(_loader_data,
1660 index * FieldInfo::field_slots + num_generic_signature,
1661 CHECK);
1662 // Sometimes injected fields already exist in the Java source so
1663 // the fields array could be too long. In that case the
1664 // fields array is trimed. Also unused slots that were reserved
1665 // for generic signature indexes are discarded.
1666 {
1667 int i = 0;
1668 for (; i < index * FieldInfo::field_slots; i++) {
1669 _fields->at_put(i, fa[i]);
1670 }
1671 for (int j = total_fields * FieldInfo::field_slots;
1672 j < generic_signature_slot; j++) {
1673 _fields->at_put(i++, fa[j]);
1674 }
1675 assert(_fields->length() == i, "");
1676 }
1677
1678 if (_need_verify && length > 1) {
1679 // Check duplicated fields
1680 ResourceMark rm(THREAD);
1681 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1682 THREAD, NameSigHash*, HASH_ROW_SIZE);
1683 initialize_hashtable(names_and_sigs);
1684 bool dup = false;
1685 const Symbol* name = NULL;
1686 const Symbol* sig = NULL;
1687 {
1688 debug_only(NoSafepointVerifier nsv;)
1689 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1690 name = fs.name();
1691 sig = fs.signature();
1692 // If no duplicates, add name/signature in hashtable names_and_sigs.
1693 if (!put_after_lookup(name, sig, names_and_sigs)) {
1694 dup = true;
1695 break;
1696 }
1697 }
1698 }
1699 if (dup) {
1700 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1701 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1702 }
1703 }
1704 }
1705
1706
1707 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1708 u4 code_length,
1709 u4 exception_table_length,
1710 TRAPS) {
1711 assert(cfs != NULL, "invariant");
1712
1713 const unsafe_u2* const exception_table_start = cfs->current();
1714 assert(exception_table_start != NULL, "null exception table");
1715
1716 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1717 // end_pc,
1718 // handler_pc,
1719 // catch_type_index
1720
1721 // Will check legal target after parsing code array in verifier.
1722 if (_need_verify) {
1723 for (unsigned int i = 0; i < exception_table_length; i++) {
1724 const u2 start_pc = cfs->get_u2_fast();
1725 const u2 end_pc = cfs->get_u2_fast();
1726 const u2 handler_pc = cfs->get_u2_fast();
1727 const u2 catch_type_index = cfs->get_u2_fast();
1728 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1729 "Illegal exception table range in class file %s",
1730 CHECK_NULL);
1731 guarantee_property(handler_pc < code_length,
1732 "Illegal exception table handler in class file %s",
1733 CHECK_NULL);
1734 if (catch_type_index != 0) {
1735 guarantee_property(valid_klass_reference_at(catch_type_index),
1736 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1737 }
1738 }
1739 } else {
1740 cfs->skip_u2_fast(exception_table_length * 4);
1741 }
1742 return exception_table_start;
1743 }
1744
1745 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1746 u4 code_length,
1747 CompressedLineNumberWriteStream**const write_stream,
1748 TRAPS) {
1749
1750 const ClassFileStream* const cfs = _stream;
1751 unsigned int num_entries = cfs->get_u2(CHECK);
1752
1753 // Each entry is a u2 start_pc, and a u2 line_number
1754 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1755
1756 // Verify line number attribute and table length
1757 check_property(
1758 code_attribute_length == sizeof(u2) + length_in_bytes,
1759 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1760
1761 cfs->guarantee_more(length_in_bytes, CHECK);
1762
1763 if ((*write_stream) == NULL) {
1764 if (length_in_bytes > fixed_buffer_size) {
1765 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1766 } else {
1767 (*write_stream) = new CompressedLineNumberWriteStream(
1768 _linenumbertable_buffer, fixed_buffer_size);
1769 }
1770 }
1771
1772 while (num_entries-- > 0) {
1773 const u2 bci = cfs->get_u2_fast(); // start_pc
1774 const u2 line = cfs->get_u2_fast(); // line_number
1775 guarantee_property(bci < code_length,
1776 "Invalid pc in LineNumberTable in class file %s", CHECK);
1777 (*write_stream)->write_pair(bci, line);
1778 }
1779 }
1780
1781
1782 class LVT_Hash : public AllStatic {
1783 public:
1784
1785 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1786 /*
1787 * 3-tuple start_bci/length/slot has to be unique key,
1788 * so the following comparison seems to be redundant:
1789 * && elem->name_cp_index == entry->_elem->name_cp_index
1790 */
1791 return (e0.start_bci == e1.start_bci &&
1792 e0.length == e1.length &&
1793 e0.name_cp_index == e1.name_cp_index &&
1794 e0.slot == e1.slot);
1795 }
1796
1797 static unsigned int hash(LocalVariableTableElement const& e0) {
1798 unsigned int raw_hash = e0.start_bci;
1799
1800 raw_hash = e0.length + raw_hash * 37;
1801 raw_hash = e0.name_cp_index + raw_hash * 37;
1802 raw_hash = e0.slot + raw_hash * 37;
1803
1804 return raw_hash;
1805 }
1806 };
1807
1808
1809 // Class file LocalVariableTable elements.
1810 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1811 public:
1812 u2 start_bci;
1813 u2 length;
1814 u2 name_cp_index;
1815 u2 descriptor_cp_index;
1816 u2 slot;
1817 };
1818
1819 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1820 LocalVariableTableElement* const lvt) {
1821 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1822 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1823 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1824 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1825 lvt->signature_cp_index = 0;
1826 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1827 }
1828
1829 // Function is used to parse both attributes:
1830 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1831 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1832 u4 code_length,
1833 u2 max_locals,
1834 u4 code_attribute_length,
1835 u2* const localvariable_table_length,
1836 bool isLVTT,
1837 TRAPS) {
1838 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1839 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1840 const unsigned int size =
1841 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1842
1843 const ConstantPool* const cp = _cp;
1844
1845 // Verify local variable table attribute has right length
1846 if (_need_verify) {
1847 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1848 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1849 }
1850
1851 const unsafe_u2* const localvariable_table_start = cfs->current();
1852 assert(localvariable_table_start != NULL, "null local variable table");
1853 if (!_need_verify) {
1854 cfs->skip_u2_fast(size);
1855 } else {
1856 cfs->guarantee_more(size * 2, CHECK_NULL);
1857 for(int i = 0; i < (*localvariable_table_length); i++) {
1858 const u2 start_pc = cfs->get_u2_fast();
1859 const u2 length = cfs->get_u2_fast();
1860 const u2 name_index = cfs->get_u2_fast();
1861 const u2 descriptor_index = cfs->get_u2_fast();
1862 const u2 index = cfs->get_u2_fast();
1863 // Assign to a u4 to avoid overflow
1864 const u4 end_pc = (u4)start_pc + (u4)length;
1865
1866 if (start_pc >= code_length) {
1867 classfile_parse_error(
1868 "Invalid start_pc %u in %s in class file %s",
1869 start_pc, tbl_name, CHECK_NULL);
1870 }
1871 if (end_pc > code_length) {
1872 classfile_parse_error(
1873 "Invalid length %u in %s in class file %s",
1874 length, tbl_name, CHECK_NULL);
1875 }
1876 const int cp_size = cp->length();
1877 guarantee_property(valid_symbol_at(name_index),
1878 "Name index %u in %s has bad constant type in class file %s",
1879 name_index, tbl_name, CHECK_NULL);
1880 guarantee_property(valid_symbol_at(descriptor_index),
1881 "Signature index %u in %s has bad constant type in class file %s",
1882 descriptor_index, tbl_name, CHECK_NULL);
1883
1884 const Symbol* const name = cp->symbol_at(name_index);
1885 const Symbol* const sig = cp->symbol_at(descriptor_index);
1886 verify_legal_field_name(name, CHECK_NULL);
1887 u2 extra_slot = 0;
1888 if (!isLVTT) {
1889 verify_legal_field_signature(name, sig, CHECK_NULL);
1890
1891 // 4894874: check special cases for double and long local variables
1892 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1893 sig == vmSymbols::type_signature(T_LONG)) {
1894 extra_slot = 1;
1895 }
1896 }
1897 guarantee_property((index + extra_slot) < max_locals,
1898 "Invalid index %u in %s in class file %s",
1899 index, tbl_name, CHECK_NULL);
1900 }
1901 }
1902 return localvariable_table_start;
1903 }
1904
1905
1906 void ClassFileParser::parse_type_array(u2 array_length,
1907 u4 code_length,
1908 u4* const u1_index,
1909 u4* const u2_index,
1910 u1* const u1_array,
1911 u2* const u2_array,
1912 TRAPS) {
1913 const ClassFileStream* const cfs = _stream;
1914 u2 index = 0; // index in the array with long/double occupying two slots
1915 u4 i1 = *u1_index;
1916 u4 i2 = *u2_index + 1;
1917 for(int i = 0; i < array_length; i++) {
1918 const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1919 index++;
1920 if (tag == ITEM_Long || tag == ITEM_Double) {
1921 index++;
1922 } else if (tag == ITEM_Object) {
1923 const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1924 guarantee_property(valid_klass_reference_at(class_index),
1925 "Bad class index %u in StackMap in class file %s",
1926 class_index, CHECK);
1927 } else if (tag == ITEM_Uninitialized) {
1928 const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1929 guarantee_property(
1930 offset < code_length,
1931 "Bad uninitialized type offset %u in StackMap in class file %s",
1932 offset, CHECK);
1933 } else {
1934 guarantee_property(
1935 tag <= (u1)ITEM_Uninitialized,
1936 "Unknown variable type %u in StackMap in class file %s",
1937 tag, CHECK);
1938 }
1939 }
1940 u2_array[*u2_index] = index;
1941 *u1_index = i1;
1942 *u2_index = i2;
1943 }
1944
1945 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1946 u4 code_attribute_length,
1947 bool need_verify,
1948 TRAPS) {
1949 assert(cfs != NULL, "invariant");
1950
1951 if (0 == code_attribute_length) {
1952 return NULL;
1953 }
1954
1955 const u1* const stackmap_table_start = cfs->current();
1956 assert(stackmap_table_start != NULL, "null stackmap table");
1957
1958 // check code_attribute_length first
1959 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1960
1961 if (!need_verify && !DumpSharedSpaces) {
1962 return NULL;
1963 }
1964 return stackmap_table_start;
1965 }
1966
1967 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1968 u2* const checked_exceptions_length,
1969 u4 method_attribute_length,
1970 TRAPS) {
1971 assert(cfs != NULL, "invariant");
1972 assert(checked_exceptions_length != NULL, "invariant");
1973
1974 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1975 *checked_exceptions_length = cfs->get_u2_fast();
1976 const unsigned int size =
1977 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1978 const unsafe_u2* const checked_exceptions_start = cfs->current();
1979 assert(checked_exceptions_start != NULL, "null checked exceptions");
1980 if (!_need_verify) {
1981 cfs->skip_u2_fast(size);
1982 } else {
1983 // Verify each value in the checked exception table
1984 u2 checked_exception;
1985 const u2 len = *checked_exceptions_length;
1986 cfs->guarantee_more(2 * len, CHECK_NULL);
1987 for (int i = 0; i < len; i++) {
1988 checked_exception = cfs->get_u2_fast();
1989 check_property(
1990 valid_klass_reference_at(checked_exception),
1991 "Exception name has bad type at constant pool %u in class file %s",
1992 checked_exception, CHECK_NULL);
1993 }
1994 }
1995 // check exceptions attribute length
1996 if (_need_verify) {
1997 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1998 sizeof(u2) * size),
1999 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2000 }
2001 return checked_exceptions_start;
2002 }
2003
2004 void ClassFileParser::throwIllegalSignature(const char* type,
2005 const Symbol* name,
2006 const Symbol* sig,
2007 TRAPS) const {
2008 assert(name != NULL, "invariant");
2009 assert(sig != NULL, "invariant");
2010
2011 ResourceMark rm(THREAD);
2012 Exceptions::fthrow(THREAD_AND_LOCATION,
2013 vmSymbols::java_lang_ClassFormatError(),
2014 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2015 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2016 }
2017
2018 AnnotationCollector::ID
2019 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2020 const Symbol* name) {
2021 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2022 // Privileged code can use all annotations. Other code silently drops some.
2023 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2024 loader_data->is_platform_class_loader_data() ||
2025 loader_data->is_anonymous();
2026 switch (sid) {
2027 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2028 if (_location != _in_method) break; // only allow for methods
2029 if (!privileged) break; // only allow in privileged code
2030 return _method_CallerSensitive;
2031 }
2032 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2033 if (_location != _in_method) break; // only allow for methods
2034 if (!privileged) break; // only allow in privileged code
2035 return _method_ForceInline;
2036 }
2037 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2038 if (_location != _in_method) break; // only allow for methods
2039 if (!privileged) break; // only allow in privileged code
2040 return _method_DontInline;
2041 }
2042 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2043 if (_location != _in_method) break; // only allow for methods
2044 if (!privileged) break; // only allow in privileged code
2045 return _method_InjectedProfile;
2046 }
2047 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2048 if (_location != _in_method) break; // only allow for methods
2049 if (!privileged) break; // only allow in privileged code
2050 return _method_LambdaForm_Compiled;
2051 }
2052 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): {
2053 if (_location != _in_method) break; // only allow for methods
2054 if (!privileged) break; // only allow in privileged code
2055 return _method_LambdaForm_Hidden;
2056 }
2057 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2058 if (_location != _in_method) break; // only allow for methods
2059 if (!privileged) break; // only allow in privileged code
2060 return _method_HotSpotIntrinsicCandidate;
2061 }
2062 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2063 if (_location != _in_field) break; // only allow for fields
2064 if (!privileged) break; // only allow in privileged code
2065 return _field_Stable;
2066 }
2067 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2068 if (_location != _in_field && _location != _in_class) {
2069 break; // only allow for fields and classes
2070 }
2071 if (!EnableContended || (RestrictContended && !privileged)) {
2072 break; // honor privileges
2073 }
2074 return _jdk_internal_vm_annotation_Contended;
2075 }
2076 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2077 if (_location != _in_method) break; // only allow for methods
2078 if (RestrictReservedStack && !privileged) break; // honor privileges
2079 return _jdk_internal_vm_annotation_ReservedStackAccess;
2080 }
2081 default: {
2082 break;
2083 }
2084 }
2085 return AnnotationCollector::_unknown;
2086 }
2087
2088 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2089 if (is_contended())
2090 f->set_contended_group(contended_group());
2091 if (is_stable())
2092 f->set_stable(true);
2093 }
2094
2095 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2096 // If there's an error deallocate metadata for field annotations
2097 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2098 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2099 }
2100
2101 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2102 if (has_annotation(_method_CallerSensitive))
2103 m->set_caller_sensitive(true);
2104 if (has_annotation(_method_ForceInline))
2105 m->set_force_inline(true);
2106 if (has_annotation(_method_DontInline))
2107 m->set_dont_inline(true);
2108 if (has_annotation(_method_InjectedProfile))
2109 m->set_has_injected_profile(true);
2110 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2111 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2112 if (has_annotation(_method_LambdaForm_Hidden))
2113 m->set_hidden(true);
2114 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2115 m->set_intrinsic_candidate(true);
2116 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2117 m->set_has_reserved_stack_access(true);
2118 }
2119
2120 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2121 assert(ik != NULL, "invariant");
2122 ik->set_is_contended(is_contended());
2123 }
2124
2125 #define MAX_ARGS_SIZE 255
2126 #define MAX_CODE_SIZE 65535
2127 #define INITIAL_MAX_LVT_NUMBER 256
2128
2129 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2130 *
2131 * Rules for LVT's and LVTT's are:
2132 * - There can be any number of LVT's and LVTT's.
2133 * - If there are n LVT's, it is the same as if there was just
2134 * one LVT containing all the entries from the n LVT's.
2135 * - There may be no more than one LVT entry per local variable.
2136 * Two LVT entries are 'equal' if these fields are the same:
2137 * start_pc, length, name, slot
2138 * - There may be no more than one LVTT entry per each LVT entry.
2139 * Each LVTT entry has to match some LVT entry.
2140 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2141 */
2142 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2143 int lvt_cnt,
2144 u2* const localvariable_table_length,
2145 const unsafe_u2** const localvariable_table_start,
2146 int lvtt_cnt,
2147 u2* const localvariable_type_table_length,
2148 const unsafe_u2** const localvariable_type_table_start,
2149 TRAPS) {
2150
2151 ResourceMark rm(THREAD);
2152
2153 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2154 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2155
2156 LVT_HashTable* const table = new LVT_HashTable();
2157
2158 // To fill LocalVariableTable in
2159 const Classfile_LVT_Element* cf_lvt;
2160 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2161
2162 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2163 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2164 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2165 copy_lvt_element(&cf_lvt[idx], lvt);
2166 // If no duplicates, add LVT elem in hashtable.
2167 if (table->put(*lvt, lvt) == false
2168 && _need_verify
2169 && _major_version >= JAVA_1_5_VERSION) {
2170 classfile_parse_error("Duplicated LocalVariableTable attribute "
2171 "entry for '%s' in class file %s",
2172 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2173 CHECK);
2174 }
2175 }
2176 }
2177
2178 // To merge LocalVariableTable and LocalVariableTypeTable
2179 const Classfile_LVT_Element* cf_lvtt;
2180 LocalVariableTableElement lvtt_elem;
2181
2182 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2183 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2184 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2185 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2186 LocalVariableTableElement** entry = table->get(lvtt_elem);
2187 if (entry == NULL) {
2188 if (_need_verify) {
2189 classfile_parse_error("LVTT entry for '%s' in class file %s "
2190 "does not match any LVT entry",
2191 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2192 CHECK);
2193 }
2194 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2195 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2196 "entry for '%s' in class file %s",
2197 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2198 CHECK);
2199 } else {
2200 // to add generic signatures into LocalVariableTable
2201 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2202 }
2203 }
2204 }
2205 }
2206
2207
2208 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2209 const u1* runtime_visible_annotations,
2210 int runtime_visible_annotations_length,
2211 const u1* runtime_invisible_annotations,
2212 int runtime_invisible_annotations_length,
2213 const u1* runtime_visible_parameter_annotations,
2214 int runtime_visible_parameter_annotations_length,
2215 const u1* runtime_invisible_parameter_annotations,
2216 int runtime_invisible_parameter_annotations_length,
2217 const u1* runtime_visible_type_annotations,
2218 int runtime_visible_type_annotations_length,
2219 const u1* runtime_invisible_type_annotations,
2220 int runtime_invisible_type_annotations_length,
2221 const u1* annotation_default,
2222 int annotation_default_length,
2223 TRAPS) {
2224
2225 AnnotationArray* a;
2226
2227 if (runtime_visible_annotations_length +
2228 runtime_invisible_annotations_length > 0) {
2229 a = assemble_annotations(runtime_visible_annotations,
2230 runtime_visible_annotations_length,
2231 runtime_invisible_annotations,
2232 runtime_invisible_annotations_length,
2233 CHECK);
2234 cm->set_method_annotations(a);
2235 }
2236
2237 if (runtime_visible_parameter_annotations_length +
2238 runtime_invisible_parameter_annotations_length > 0) {
2239 a = assemble_annotations(runtime_visible_parameter_annotations,
2240 runtime_visible_parameter_annotations_length,
2241 runtime_invisible_parameter_annotations,
2242 runtime_invisible_parameter_annotations_length,
2243 CHECK);
2244 cm->set_parameter_annotations(a);
2245 }
2246
2247 if (annotation_default_length > 0) {
2248 a = assemble_annotations(annotation_default,
2249 annotation_default_length,
2250 NULL,
2251 0,
2252 CHECK);
2253 cm->set_default_annotations(a);
2254 }
2255
2256 if (runtime_visible_type_annotations_length +
2257 runtime_invisible_type_annotations_length > 0) {
2258 a = assemble_annotations(runtime_visible_type_annotations,
2259 runtime_visible_type_annotations_length,
2260 runtime_invisible_type_annotations,
2261 runtime_invisible_type_annotations_length,
2262 CHECK);
2263 cm->set_type_annotations(a);
2264 }
2265 }
2266
2267
2268 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2269 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2270 // Method* to save footprint, so we only know the size of the resulting Method* when the
2271 // entire method attribute is parsed.
2272 //
2273 // The promoted_flags parameter is used to pass relevant access_flags
2274 // from the method back up to the containing klass. These flag values
2275 // are added to klass's access_flags.
2276
2277 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2278 bool is_interface,
2279 const ConstantPool* cp,
2280 AccessFlags* const promoted_flags,
2281 TRAPS) {
2282 assert(cfs != NULL, "invariant");
2283 assert(cp != NULL, "invariant");
2284 assert(promoted_flags != NULL, "invariant");
2285
2286 ResourceMark rm(THREAD);
2287 // Parse fixed parts:
2288 // access_flags, name_index, descriptor_index, attributes_count
2289 cfs->guarantee_more(8, CHECK_NULL);
2290
2291 int flags = cfs->get_u2_fast();
2292 const u2 name_index = cfs->get_u2_fast();
2293 const int cp_size = cp->length();
2294 check_property(
2295 valid_symbol_at(name_index),
2296 "Illegal constant pool index %u for method name in class file %s",
2297 name_index, CHECK_NULL);
2298 const Symbol* const name = cp->symbol_at(name_index);
2299 verify_legal_method_name(name, CHECK_NULL);
2300
2301 const u2 signature_index = cfs->get_u2_fast();
2302 guarantee_property(
2303 valid_symbol_at(signature_index),
2304 "Illegal constant pool index %u for method signature in class file %s",
2305 signature_index, CHECK_NULL);
2306 const Symbol* const signature = cp->symbol_at(signature_index);
2307
2308 if (name == vmSymbols::class_initializer_name()) {
2309 // We ignore the other access flags for a valid class initializer.
2310 // (JVM Spec 2nd ed., chapter 4.6)
2311 if (_major_version < 51) { // backward compatibility
2312 flags = JVM_ACC_STATIC;
2313 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2314 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2315 } else {
2316 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2317 }
2318 } else {
2319 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2320 }
2321
2322 if (name == vmSymbols::object_initializer_name() && is_interface) {
2323 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2324 }
2325
2326 int args_size = -1; // only used when _need_verify is true
2327 if (_need_verify) {
2328 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2329 verify_legal_method_signature(name, signature, CHECK_NULL);
2330 if (args_size > MAX_ARGS_SIZE) {
2331 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2332 }
2333 }
2334
2335 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2336
2337 // Default values for code and exceptions attribute elements
2338 u2 max_stack = 0;
2339 u2 max_locals = 0;
2340 u4 code_length = 0;
2341 const u1* code_start = 0;
2342 u2 exception_table_length = 0;
2343 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2344 Array<int>* exception_handlers = Universe::the_empty_int_array();
2345 u2 checked_exceptions_length = 0;
2346 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2347 CompressedLineNumberWriteStream* linenumber_table = NULL;
2348 int linenumber_table_length = 0;
2349 int total_lvt_length = 0;
2350 u2 lvt_cnt = 0;
2351 u2 lvtt_cnt = 0;
2352 bool lvt_allocated = false;
2353 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2354 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2355 u2* localvariable_table_length = NULL;
2356 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2357 u2* localvariable_type_table_length = NULL;
2358 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2359 int method_parameters_length = -1;
2360 const u1* method_parameters_data = NULL;
2361 bool method_parameters_seen = false;
2362 bool parsed_code_attribute = false;
2363 bool parsed_checked_exceptions_attribute = false;
2364 bool parsed_stackmap_attribute = false;
2365 // stackmap attribute - JDK1.5
2366 const u1* stackmap_data = NULL;
2367 int stackmap_data_length = 0;
2368 u2 generic_signature_index = 0;
2369 MethodAnnotationCollector parsed_annotations;
2370 const u1* runtime_visible_annotations = NULL;
2371 int runtime_visible_annotations_length = 0;
2372 const u1* runtime_invisible_annotations = NULL;
2373 int runtime_invisible_annotations_length = 0;
2374 const u1* runtime_visible_parameter_annotations = NULL;
2375 int runtime_visible_parameter_annotations_length = 0;
2376 const u1* runtime_invisible_parameter_annotations = NULL;
2377 int runtime_invisible_parameter_annotations_length = 0;
2378 const u1* runtime_visible_type_annotations = NULL;
2379 int runtime_visible_type_annotations_length = 0;
2380 const u1* runtime_invisible_type_annotations = NULL;
2381 int runtime_invisible_type_annotations_length = 0;
2382 bool runtime_invisible_annotations_exists = false;
2383 bool runtime_invisible_type_annotations_exists = false;
2384 bool runtime_invisible_parameter_annotations_exists = false;
2385 const u1* annotation_default = NULL;
2386 int annotation_default_length = 0;
2387
2388 // Parse code and exceptions attribute
2389 u2 method_attributes_count = cfs->get_u2_fast();
2390 while (method_attributes_count--) {
2391 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2392 const u2 method_attribute_name_index = cfs->get_u2_fast();
2393 const u4 method_attribute_length = cfs->get_u4_fast();
2394 check_property(
2395 valid_symbol_at(method_attribute_name_index),
2396 "Invalid method attribute name index %u in class file %s",
2397 method_attribute_name_index, CHECK_NULL);
2398
2399 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2400 if (method_attribute_name == vmSymbols::tag_code()) {
2401 // Parse Code attribute
2402 if (_need_verify) {
2403 guarantee_property(
2404 !access_flags.is_native() && !access_flags.is_abstract(),
2405 "Code attribute in native or abstract methods in class file %s",
2406 CHECK_NULL);
2407 }
2408 if (parsed_code_attribute) {
2409 classfile_parse_error("Multiple Code attributes in class file %s",
2410 CHECK_NULL);
2411 }
2412 parsed_code_attribute = true;
2413
2414 // Stack size, locals size, and code size
2415 if (_major_version == 45 && _minor_version <= 2) {
2416 cfs->guarantee_more(4, CHECK_NULL);
2417 max_stack = cfs->get_u1_fast();
2418 max_locals = cfs->get_u1_fast();
2419 code_length = cfs->get_u2_fast();
2420 } else {
2421 cfs->guarantee_more(8, CHECK_NULL);
2422 max_stack = cfs->get_u2_fast();
2423 max_locals = cfs->get_u2_fast();
2424 code_length = cfs->get_u4_fast();
2425 }
2426 if (_need_verify) {
2427 guarantee_property(args_size <= max_locals,
2428 "Arguments can't fit into locals in class file %s",
2429 CHECK_NULL);
2430 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2431 "Invalid method Code length %u in class file %s",
2432 code_length, CHECK_NULL);
2433 }
2434 // Code pointer
2435 code_start = cfs->current();
2436 assert(code_start != NULL, "null code start");
2437 cfs->guarantee_more(code_length, CHECK_NULL);
2438 cfs->skip_u1_fast(code_length);
2439
2440 // Exception handler table
2441 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2442 exception_table_length = cfs->get_u2_fast();
2443 if (exception_table_length > 0) {
2444 exception_table_start = parse_exception_table(cfs,
2445 code_length,
2446 exception_table_length,
2447 CHECK_NULL);
2448 }
2449
2450 // Parse additional attributes in code attribute
2451 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2452 u2 code_attributes_count = cfs->get_u2_fast();
2453
2454 unsigned int calculated_attribute_length = 0;
2455
2456 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2457 calculated_attribute_length =
2458 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2459 } else {
2460 // max_stack, locals and length are smaller in pre-version 45.2 classes
2461 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2462 }
2463 calculated_attribute_length +=
2464 code_length +
2465 sizeof(exception_table_length) +
2466 sizeof(code_attributes_count) +
2467 exception_table_length *
2468 ( sizeof(u2) + // start_pc
2469 sizeof(u2) + // end_pc
2470 sizeof(u2) + // handler_pc
2471 sizeof(u2) ); // catch_type_index
2472
2473 while (code_attributes_count--) {
2474 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2475 const u2 code_attribute_name_index = cfs->get_u2_fast();
2476 const u4 code_attribute_length = cfs->get_u4_fast();
2477 calculated_attribute_length += code_attribute_length +
2478 sizeof(code_attribute_name_index) +
2479 sizeof(code_attribute_length);
2480 check_property(valid_symbol_at(code_attribute_name_index),
2481 "Invalid code attribute name index %u in class file %s",
2482 code_attribute_name_index,
2483 CHECK_NULL);
2484 if (LoadLineNumberTables &&
2485 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2486 // Parse and compress line number table
2487 parse_linenumber_table(code_attribute_length,
2488 code_length,
2489 &linenumber_table,
2490 CHECK_NULL);
2491
2492 } else if (LoadLocalVariableTables &&
2493 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2494 // Parse local variable table
2495 if (!lvt_allocated) {
2496 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2497 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2498 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2499 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2500 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2501 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2502 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2503 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2504 lvt_allocated = true;
2505 }
2506 if (lvt_cnt == max_lvt_cnt) {
2507 max_lvt_cnt <<= 1;
2508 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2509 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2510 }
2511 localvariable_table_start[lvt_cnt] =
2512 parse_localvariable_table(cfs,
2513 code_length,
2514 max_locals,
2515 code_attribute_length,
2516 &localvariable_table_length[lvt_cnt],
2517 false, // is not LVTT
2518 CHECK_NULL);
2519 total_lvt_length += localvariable_table_length[lvt_cnt];
2520 lvt_cnt++;
2521 } else if (LoadLocalVariableTypeTables &&
2522 _major_version >= JAVA_1_5_VERSION &&
2523 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2524 if (!lvt_allocated) {
2525 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2526 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2527 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2528 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2529 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2530 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2531 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2532 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2533 lvt_allocated = true;
2534 }
2535 // Parse local variable type table
2536 if (lvtt_cnt == max_lvtt_cnt) {
2537 max_lvtt_cnt <<= 1;
2538 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2539 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2540 }
2541 localvariable_type_table_start[lvtt_cnt] =
2542 parse_localvariable_table(cfs,
2543 code_length,
2544 max_locals,
2545 code_attribute_length,
2546 &localvariable_type_table_length[lvtt_cnt],
2547 true, // is LVTT
2548 CHECK_NULL);
2549 lvtt_cnt++;
2550 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2551 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2552 // Stack map is only needed by the new verifier in JDK1.5.
2553 if (parsed_stackmap_attribute) {
2554 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2555 }
2556 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2557 stackmap_data_length = code_attribute_length;
2558 parsed_stackmap_attribute = true;
2559 } else {
2560 // Skip unknown attributes
2561 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2562 }
2563 }
2564 // check method attribute length
2565 if (_need_verify) {
2566 guarantee_property(method_attribute_length == calculated_attribute_length,
2567 "Code segment has wrong length in class file %s",
2568 CHECK_NULL);
2569 }
2570 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2571 // Parse Exceptions attribute
2572 if (parsed_checked_exceptions_attribute) {
2573 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2574 CHECK_NULL);
2575 }
2576 parsed_checked_exceptions_attribute = true;
2577 checked_exceptions_start =
2578 parse_checked_exceptions(cfs,
2579 &checked_exceptions_length,
2580 method_attribute_length,
2581 CHECK_NULL);
2582 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2583 // reject multiple method parameters
2584 if (method_parameters_seen) {
2585 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2586 CHECK_NULL);
2587 }
2588 method_parameters_seen = true;
2589 method_parameters_length = cfs->get_u1_fast();
2590 const u2 real_length = (method_parameters_length * 4u) + 1u;
2591 if (method_attribute_length != real_length) {
2592 classfile_parse_error(
2593 "Invalid MethodParameters method attribute length %u in class file",
2594 method_attribute_length, CHECK_NULL);
2595 }
2596 method_parameters_data = cfs->current();
2597 cfs->skip_u2_fast(method_parameters_length);
2598 cfs->skip_u2_fast(method_parameters_length);
2599 // ignore this attribute if it cannot be reflected
2600 if (!SystemDictionary::Parameter_klass_loaded())
2601 method_parameters_length = -1;
2602 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2603 if (method_attribute_length != 0) {
2604 classfile_parse_error(
2605 "Invalid Synthetic method attribute length %u in class file %s",
2606 method_attribute_length, CHECK_NULL);
2607 }
2608 // Should we check that there hasn't already been a synthetic attribute?
2609 access_flags.set_is_synthetic();
2610 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2611 if (method_attribute_length != 0) {
2612 classfile_parse_error(
2613 "Invalid Deprecated method attribute length %u in class file %s",
2614 method_attribute_length, CHECK_NULL);
2615 }
2616 } else if (_major_version >= JAVA_1_5_VERSION) {
2617 if (method_attribute_name == vmSymbols::tag_signature()) {
2618 if (generic_signature_index != 0) {
2619 classfile_parse_error(
2620 "Multiple Signature attributes for method in class file %s",
2621 CHECK_NULL);
2622 }
2623 if (method_attribute_length != 2) {
2624 classfile_parse_error(
2625 "Invalid Signature attribute length %u in class file %s",
2626 method_attribute_length, CHECK_NULL);
2627 }
2628 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2629 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2630 if (runtime_visible_annotations != NULL) {
2631 classfile_parse_error(
2632 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2633 CHECK_NULL);
2634 }
2635 runtime_visible_annotations_length = method_attribute_length;
2636 runtime_visible_annotations = cfs->current();
2637 assert(runtime_visible_annotations != NULL, "null visible annotations");
2638 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2639 parse_annotations(cp,
2640 runtime_visible_annotations,
2641 runtime_visible_annotations_length,
2642 &parsed_annotations,
2643 _loader_data,
2644 CHECK_NULL);
2645 cfs->skip_u1_fast(runtime_visible_annotations_length);
2646 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2647 if (runtime_invisible_annotations_exists) {
2648 classfile_parse_error(
2649 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2650 CHECK_NULL);
2651 }
2652 runtime_invisible_annotations_exists = true;
2653 if (PreserveAllAnnotations) {
2654 runtime_invisible_annotations_length = method_attribute_length;
2655 runtime_invisible_annotations = cfs->current();
2656 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2657 }
2658 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2659 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2660 if (runtime_visible_parameter_annotations != NULL) {
2661 classfile_parse_error(
2662 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2663 CHECK_NULL);
2664 }
2665 runtime_visible_parameter_annotations_length = method_attribute_length;
2666 runtime_visible_parameter_annotations = cfs->current();
2667 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2668 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2669 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2670 if (runtime_invisible_parameter_annotations_exists) {
2671 classfile_parse_error(
2672 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2673 CHECK_NULL);
2674 }
2675 runtime_invisible_parameter_annotations_exists = true;
2676 if (PreserveAllAnnotations) {
2677 runtime_invisible_parameter_annotations_length = method_attribute_length;
2678 runtime_invisible_parameter_annotations = cfs->current();
2679 assert(runtime_invisible_parameter_annotations != NULL,
2680 "null invisible parameter annotations");
2681 }
2682 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2683 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2684 if (annotation_default != NULL) {
2685 classfile_parse_error(
2686 "Multiple AnnotationDefault attributes for method in class file %s",
2687 CHECK_NULL);
2688 }
2689 annotation_default_length = method_attribute_length;
2690 annotation_default = cfs->current();
2691 assert(annotation_default != NULL, "null annotation default");
2692 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2693 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2694 if (runtime_visible_type_annotations != NULL) {
2695 classfile_parse_error(
2696 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2697 CHECK_NULL);
2698 }
2699 runtime_visible_type_annotations_length = method_attribute_length;
2700 runtime_visible_type_annotations = cfs->current();
2701 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2702 // No need for the VM to parse Type annotations
2703 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2704 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2705 if (runtime_invisible_type_annotations_exists) {
2706 classfile_parse_error(
2707 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2708 CHECK_NULL);
2709 } else {
2710 runtime_invisible_type_annotations_exists = true;
2711 }
2712 if (PreserveAllAnnotations) {
2713 runtime_invisible_type_annotations_length = method_attribute_length;
2714 runtime_invisible_type_annotations = cfs->current();
2715 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2716 }
2717 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2718 } else {
2719 // Skip unknown attributes
2720 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2721 }
2722 } else {
2723 // Skip unknown attributes
2724 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2725 }
2726 }
2727
2728 if (linenumber_table != NULL) {
2729 linenumber_table->write_terminator();
2730 linenumber_table_length = linenumber_table->position();
2731 }
2732
2733 // Make sure there's at least one Code attribute in non-native/non-abstract method
2734 if (_need_verify) {
2735 guarantee_property(access_flags.is_native() ||
2736 access_flags.is_abstract() ||
2737 parsed_code_attribute,
2738 "Absent Code attribute in method that is not native or abstract in class file %s",
2739 CHECK_NULL);
2740 }
2741
2742 // All sizing information for a Method* is finally available, now create it
2743 InlineTableSizes sizes(
2744 total_lvt_length,
2745 linenumber_table_length,
2746 exception_table_length,
2747 checked_exceptions_length,
2748 method_parameters_length,
2749 generic_signature_index,
2750 runtime_visible_annotations_length +
2751 runtime_invisible_annotations_length,
2752 runtime_visible_parameter_annotations_length +
2753 runtime_invisible_parameter_annotations_length,
2754 runtime_visible_type_annotations_length +
2755 runtime_invisible_type_annotations_length,
2756 annotation_default_length,
2757 0);
2758
2759 Method* const m = Method::allocate(_loader_data,
2760 code_length,
2761 access_flags,
2762 &sizes,
2763 ConstMethod::NORMAL,
2764 CHECK_NULL);
2765
2766 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2767
2768 // Fill in information from fixed part (access_flags already set)
2769 m->set_constants(_cp);
2770 m->set_name_index(name_index);
2771 m->set_signature_index(signature_index);
2772
2773 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2774 m->constMethod()->set_result_type(rtf.type());
2775
2776 if (args_size >= 0) {
2777 m->set_size_of_parameters(args_size);
2778 } else {
2779 m->compute_size_of_parameters(THREAD);
2780 }
2781 #ifdef ASSERT
2782 if (args_size >= 0) {
2783 m->compute_size_of_parameters(THREAD);
2784 assert(args_size == m->size_of_parameters(), "");
2785 }
2786 #endif
2787
2788 // Fill in code attribute information
2789 m->set_max_stack(max_stack);
2790 m->set_max_locals(max_locals);
2791 if (stackmap_data != NULL) {
2792 m->constMethod()->copy_stackmap_data(_loader_data,
2793 (u1*)stackmap_data,
2794 stackmap_data_length,
2795 CHECK_NULL);
2796 }
2797
2798 // Copy byte codes
2799 m->set_code((u1*)code_start);
2800
2801 // Copy line number table
2802 if (linenumber_table != NULL) {
2803 memcpy(m->compressed_linenumber_table(),
2804 linenumber_table->buffer(),
2805 linenumber_table_length);
2806 }
2807
2808 // Copy exception table
2809 if (exception_table_length > 0) {
2810 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2811 m->exception_table_start(),
2812 exception_table_length * sizeof(ExceptionTableElement),
2813 sizeof(u2));
2814 }
2815
2816 // Copy method parameters
2817 if (method_parameters_length > 0) {
2818 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2819 for (int i = 0; i < method_parameters_length; i++) {
2820 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2821 method_parameters_data += 2;
2822 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2823 method_parameters_data += 2;
2824 }
2825 }
2826
2827 // Copy checked exceptions
2828 if (checked_exceptions_length > 0) {
2829 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2830 m->checked_exceptions_start(),
2831 checked_exceptions_length * sizeof(CheckedExceptionElement),
2832 sizeof(u2));
2833 }
2834
2835 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2836 if (total_lvt_length > 0) {
2837 promoted_flags->set_has_localvariable_table();
2838 copy_localvariable_table(m->constMethod(),
2839 lvt_cnt,
2840 localvariable_table_length,
2841 localvariable_table_start,
2842 lvtt_cnt,
2843 localvariable_type_table_length,
2844 localvariable_type_table_start,
2845 CHECK_NULL);
2846 }
2847
2848 if (parsed_annotations.has_any_annotations())
2849 parsed_annotations.apply_to(m);
2850
2851 // Copy annotations
2852 copy_method_annotations(m->constMethod(),
2853 runtime_visible_annotations,
2854 runtime_visible_annotations_length,
2855 runtime_invisible_annotations,
2856 runtime_invisible_annotations_length,
2857 runtime_visible_parameter_annotations,
2858 runtime_visible_parameter_annotations_length,
2859 runtime_invisible_parameter_annotations,
2860 runtime_invisible_parameter_annotations_length,
2861 runtime_visible_type_annotations,
2862 runtime_visible_type_annotations_length,
2863 runtime_invisible_type_annotations,
2864 runtime_invisible_type_annotations_length,
2865 annotation_default,
2866 annotation_default_length,
2867 CHECK_NULL);
2868
2869 if (name == vmSymbols::finalize_method_name() &&
2870 signature == vmSymbols::void_method_signature()) {
2871 if (m->is_empty_method()) {
2872 _has_empty_finalizer = true;
2873 } else {
2874 _has_finalizer = true;
2875 }
2876 }
2877 if (name == vmSymbols::object_initializer_name() &&
2878 signature == vmSymbols::void_method_signature() &&
2879 m->is_vanilla_constructor()) {
2880 _has_vanilla_constructor = true;
2881 }
2882
2883 NOT_PRODUCT(m->verify());
2884 return m;
2885 }
2886
2887
2888 // The promoted_flags parameter is used to pass relevant access_flags
2889 // from the methods back up to the containing klass. These flag values
2890 // are added to klass's access_flags.
2891 // Side-effects: populates the _methods field in the parser
2892 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2893 bool is_interface,
2894 AccessFlags* promoted_flags,
2895 bool* has_final_method,
2896 bool* declares_nonstatic_concrete_methods,
2897 TRAPS) {
2898 assert(cfs != NULL, "invariant");
2899 assert(promoted_flags != NULL, "invariant");
2900 assert(has_final_method != NULL, "invariant");
2901 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2902
2903 assert(NULL == _methods, "invariant");
2904
2905 cfs->guarantee_more(2, CHECK); // length
2906 const u2 length = cfs->get_u2_fast();
2907 if (length == 0) {
2908 _methods = Universe::the_empty_method_array();
2909 } else {
2910 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2911 length,
2912 NULL,
2913 CHECK);
2914
2915 for (int index = 0; index < length; index++) {
2916 Method* method = parse_method(cfs,
2917 is_interface,
2918 _cp,
2919 promoted_flags,
2920 CHECK);
2921
2922 if (method->is_final()) {
2923 *has_final_method = true;
2924 }
2925 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2926 // used for interface initialization, and default method inheritance analysis
2927 if (is_interface && !(*declares_nonstatic_concrete_methods)
2928 && !method->is_abstract() && !method->is_static()) {
2929 *declares_nonstatic_concrete_methods = true;
2930 }
2931 _methods->at_put(index, method);
2932 }
2933
2934 if (_need_verify && length > 1) {
2935 // Check duplicated methods
2936 ResourceMark rm(THREAD);
2937 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2938 THREAD, NameSigHash*, HASH_ROW_SIZE);
2939 initialize_hashtable(names_and_sigs);
2940 bool dup = false;
2941 const Symbol* name = NULL;
2942 const Symbol* sig = NULL;
2943 {
2944 debug_only(NoSafepointVerifier nsv;)
2945 for (int i = 0; i < length; i++) {
2946 const Method* const m = _methods->at(i);
2947 name = m->name();
2948 sig = m->signature();
2949 // If no duplicates, add name/signature in hashtable names_and_sigs.
2950 if (!put_after_lookup(name, sig, names_and_sigs)) {
2951 dup = true;
2952 break;
2953 }
2954 }
2955 }
2956 if (dup) {
2957 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2958 name->as_C_string(), sig->as_klass_external_name(), CHECK);
2959 }
2960 }
2961 }
2962 }
2963
2964 static const intArray* sort_methods(Array<Method*>* methods) {
2965 const int length = methods->length();
2966 // If JVMTI original method ordering or sharing is enabled we have to
2967 // remember the original class file ordering.
2968 // We temporarily use the vtable_index field in the Method* to store the
2969 // class file index, so we can read in after calling qsort.
2970 // Put the method ordering in the shared archive.
2971 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2972 for (int index = 0; index < length; index++) {
2973 Method* const m = methods->at(index);
2974 assert(!m->valid_vtable_index(), "vtable index should not be set");
2975 m->set_vtable_index(index);
2976 }
2977 }
2978 // Sort method array by ascending method name (for faster lookups & vtable construction)
2979 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2980 Method::sort_methods(methods);
2981
2982 intArray* method_ordering = NULL;
2983 // If JVMTI original method ordering or sharing is enabled construct int
2984 // array remembering the original ordering
2985 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2986 method_ordering = new intArray(length, length, -1);
2987 for (int index = 0; index < length; index++) {
2988 Method* const m = methods->at(index);
2989 const int old_index = m->vtable_index();
2990 assert(old_index >= 0 && old_index < length, "invalid method index");
2991 method_ordering->at_put(index, old_index);
2992 m->set_vtable_index(Method::invalid_vtable_index);
2993 }
2994 }
2995 return method_ordering;
2996 }
2997
2998 // Parse generic_signature attribute for methods and fields
2999 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3000 TRAPS) {
3001 assert(cfs != NULL, "invariant");
3002
3003 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3004 const u2 generic_signature_index = cfs->get_u2_fast();
3005 check_property(
3006 valid_symbol_at(generic_signature_index),
3007 "Invalid Signature attribute at constant pool index %u in class file %s",
3008 generic_signature_index, CHECK_0);
3009 return generic_signature_index;
3010 }
3011
3012 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3013 TRAPS) {
3014
3015 assert(cfs != NULL, "invariant");
3016
3017 cfs->guarantee_more(2, CHECK); // sourcefile_index
3018 const u2 sourcefile_index = cfs->get_u2_fast();
3019 check_property(
3020 valid_symbol_at(sourcefile_index),
3021 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3022 sourcefile_index, CHECK);
3023 set_class_sourcefile_index(sourcefile_index);
3024 }
3025
3026 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3027 int length,
3028 TRAPS) {
3029 assert(cfs != NULL, "invariant");
3030
3031 const u1* const sde_buffer = cfs->current();
3032 assert(sde_buffer != NULL, "null sde buffer");
3033
3034 // Don't bother storing it if there is no way to retrieve it
3035 if (JvmtiExport::can_get_source_debug_extension()) {
3036 assert((length+1) > length, "Overflow checking");
3037 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3038 for (int i = 0; i < length; i++) {
3039 sde[i] = sde_buffer[i];
3040 }
3041 sde[length] = '\0';
3042 set_class_sde_buffer((const char*)sde, length);
3043 }
3044 // Got utf8 string, set stream position forward
3045 cfs->skip_u1(length, CHECK);
3046 }
3047
3048
3049 // Inner classes can be static, private or protected (classic VM does this)
3050 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3051 JVM_ACC_PRIVATE | \
3052 JVM_ACC_PROTECTED | \
3053 JVM_ACC_STATIC \
3054 )
3055
3056 // Return number of classes in the inner classes attribute table
3057 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3058 const u1* const inner_classes_attribute_start,
3059 bool parsed_enclosingmethod_attribute,
3060 u2 enclosing_method_class_index,
3061 u2 enclosing_method_method_index,
3062 TRAPS) {
3063 const u1* const current_mark = cfs->current();
3064 u2 length = 0;
3065 if (inner_classes_attribute_start != NULL) {
3066 cfs->set_current(inner_classes_attribute_start);
3067 cfs->guarantee_more(2, CHECK_0); // length
3068 length = cfs->get_u2_fast();
3069 }
3070
3071 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3072 // method data:
3073 // [inner_class_info_index,
3074 // outer_class_info_index,
3075 // inner_name_index,
3076 // inner_class_access_flags,
3077 // ...
3078 // enclosing_method_class_index,
3079 // enclosing_method_method_index]
3080 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3081 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3082 _inner_classes = inner_classes;
3083
3084 int index = 0;
3085 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3086 for (int n = 0; n < length; n++) {
3087 // Inner class index
3088 const u2 inner_class_info_index = cfs->get_u2_fast();
3089 check_property(
3090 valid_klass_reference_at(inner_class_info_index),
3091 "inner_class_info_index %u has bad constant type in class file %s",
3092 inner_class_info_index, CHECK_0);
3093 // Outer class index
3094 const u2 outer_class_info_index = cfs->get_u2_fast();
3095 check_property(
3096 outer_class_info_index == 0 ||
3097 valid_klass_reference_at(outer_class_info_index),
3098 "outer_class_info_index %u has bad constant type in class file %s",
3099 outer_class_info_index, CHECK_0);
3100 // Inner class name
3101 const u2 inner_name_index = cfs->get_u2_fast();
3102 check_property(
3103 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3104 "inner_name_index %u has bad constant type in class file %s",
3105 inner_name_index, CHECK_0);
3106 if (_need_verify) {
3107 guarantee_property(inner_class_info_index != outer_class_info_index,
3108 "Class is both outer and inner class in class file %s", CHECK_0);
3109 }
3110 // Access flags
3111 jint flags;
3112 // JVM_ACC_MODULE is defined in JDK-9 and later.
3113 if (_major_version >= JAVA_9_VERSION) {
3114 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3115 } else {
3116 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3117 }
3118 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3119 // Set abstract bit for old class files for backward compatibility
3120 flags |= JVM_ACC_ABSTRACT;
3121 }
3122 verify_legal_class_modifiers(flags, CHECK_0);
3123 AccessFlags inner_access_flags(flags);
3124
3125 inner_classes->at_put(index++, inner_class_info_index);
3126 inner_classes->at_put(index++, outer_class_info_index);
3127 inner_classes->at_put(index++, inner_name_index);
3128 inner_classes->at_put(index++, inner_access_flags.as_short());
3129 }
3130
3131 // 4347400: make sure there's no duplicate entry in the classes array
3132 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3133 for(int i = 0; i < length * 4; i += 4) {
3134 for(int j = i + 4; j < length * 4; j += 4) {
3135 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3136 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3137 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3138 inner_classes->at(i+3) != inner_classes->at(j+3)),
3139 "Duplicate entry in InnerClasses in class file %s",
3140 CHECK_0);
3141 }
3142 }
3143 }
3144
3145 // Set EnclosingMethod class and method indexes.
3146 if (parsed_enclosingmethod_attribute) {
3147 inner_classes->at_put(index++, enclosing_method_class_index);
3148 inner_classes->at_put(index++, enclosing_method_method_index);
3149 }
3150 assert(index == size, "wrong size");
3151
3152 // Restore buffer's current position.
3153 cfs->set_current(current_mark);
3154
3155 return length;
3156 }
3157
3158 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3159 const u1* const nest_members_attribute_start,
3160 TRAPS) {
3161 const u1* const current_mark = cfs->current();
3162 u2 length = 0;
3163 if (nest_members_attribute_start != NULL) {
3164 cfs->set_current(nest_members_attribute_start);
3165 cfs->guarantee_more(2, CHECK_0); // length
3166 length = cfs->get_u2_fast();
3167 }
3168 const int size = length;
3169 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3170 _nest_members = nest_members;
3171
3172 int index = 0;
3173 cfs->guarantee_more(2 * length, CHECK_0);
3174 for (int n = 0; n < length; n++) {
3175 const u2 class_info_index = cfs->get_u2_fast();
3176 check_property(
3177 valid_klass_reference_at(class_info_index),
3178 "Nest member class_info_index %u has bad constant type in class file %s",
3179 class_info_index, CHECK_0);
3180 nest_members->at_put(index++, class_info_index);
3181 }
3182 assert(index == size, "wrong size");
3183
3184 // Restore buffer's current position.
3185 cfs->set_current(current_mark);
3186
3187 return length;
3188 }
3189
3190 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3191 set_class_synthetic_flag(true);
3192 }
3193
3194 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3195 assert(cfs != NULL, "invariant");
3196
3197 const u2 signature_index = cfs->get_u2(CHECK);
3198 check_property(
3199 valid_symbol_at(signature_index),
3200 "Invalid constant pool index %u in Signature attribute in class file %s",
3201 signature_index, CHECK);
3202 set_class_generic_signature_index(signature_index);
3203 }
3204
3205 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3206 ConstantPool* cp,
3207 u4 attribute_byte_length,
3208 TRAPS) {
3209 assert(cfs != NULL, "invariant");
3210 assert(cp != NULL, "invariant");
3211
3212 const u1* const current_start = cfs->current();
3213
3214 guarantee_property(attribute_byte_length >= sizeof(u2),
3215 "Invalid BootstrapMethods attribute length %u in class file %s",
3216 attribute_byte_length,
3217 CHECK);
3218
3219 cfs->guarantee_more(attribute_byte_length, CHECK);
3220
3221 const int attribute_array_length = cfs->get_u2_fast();
3222
3223 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3224 "Short length on BootstrapMethods in class file %s",
3225 CHECK);
3226
3227
3228 // The attribute contains a counted array of counted tuples of shorts,
3229 // represending bootstrap specifiers:
3230 // length*{bootstrap_method_index, argument_count*{argument_index}}
3231 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3232 // operand_count = number of shorts in attr, except for leading length
3233
3234 // The attribute is copied into a short[] array.
3235 // The array begins with a series of short[2] pairs, one for each tuple.
3236 const int index_size = (attribute_array_length * 2);
3237
3238 Array<u2>* const operands =
3239 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3240
3241 // Eagerly assign operands so they will be deallocated with the constant
3242 // pool if there is an error.
3243 cp->set_operands(operands);
3244
3245 int operand_fill_index = index_size;
3246 const int cp_size = cp->length();
3247
3248 for (int n = 0; n < attribute_array_length; n++) {
3249 // Store a 32-bit offset into the header of the operand array.
3250 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3251
3252 // Read a bootstrap specifier.
3253 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3254 const u2 bootstrap_method_index = cfs->get_u2_fast();
3255 const u2 argument_count = cfs->get_u2_fast();
3256 check_property(
3257 valid_cp_range(bootstrap_method_index, cp_size) &&
3258 cp->tag_at(bootstrap_method_index).is_method_handle(),
3259 "bootstrap_method_index %u has bad constant type in class file %s",
3260 bootstrap_method_index,
3261 CHECK);
3262
3263 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3264 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3265 CHECK);
3266
3267 operands->at_put(operand_fill_index++, bootstrap_method_index);
3268 operands->at_put(operand_fill_index++, argument_count);
3269
3270 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3271 for (int j = 0; j < argument_count; j++) {
3272 const u2 argument_index = cfs->get_u2_fast();
3273 check_property(
3274 valid_cp_range(argument_index, cp_size) &&
3275 cp->tag_at(argument_index).is_loadable_constant(),
3276 "argument_index %u has bad constant type in class file %s",
3277 argument_index,
3278 CHECK);
3279 operands->at_put(operand_fill_index++, argument_index);
3280 }
3281 }
3282 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3283 "Bad length on BootstrapMethods in class file %s",
3284 CHECK);
3285 }
3286
3287 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3288 ConstantPool* cp,
3289 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3290 TRAPS) {
3291 assert(cfs != NULL, "invariant");
3292 assert(cp != NULL, "invariant");
3293 assert(parsed_annotations != NULL, "invariant");
3294
3295 // Set inner classes attribute to default sentinel
3296 _inner_classes = Universe::the_empty_short_array();
3297 // Set nest members attribute to default sentinel
3298 _nest_members = Universe::the_empty_short_array();
3299 cfs->guarantee_more(2, CHECK); // attributes_count
3300 u2 attributes_count = cfs->get_u2_fast();
3301 bool parsed_sourcefile_attribute = false;
3302 bool parsed_innerclasses_attribute = false;
3303 bool parsed_nest_members_attribute = false;
3304 bool parsed_nest_host_attribute = false;
3305 bool parsed_enclosingmethod_attribute = false;
3306 bool parsed_bootstrap_methods_attribute = false;
3307 const u1* runtime_visible_annotations = NULL;
3308 int runtime_visible_annotations_length = 0;
3309 const u1* runtime_invisible_annotations = NULL;
3310 int runtime_invisible_annotations_length = 0;
3311 const u1* runtime_visible_type_annotations = NULL;
3312 int runtime_visible_type_annotations_length = 0;
3313 const u1* runtime_invisible_type_annotations = NULL;
3314 int runtime_invisible_type_annotations_length = 0;
3315 bool runtime_invisible_type_annotations_exists = false;
3316 bool runtime_invisible_annotations_exists = false;
3317 bool parsed_source_debug_ext_annotations_exist = false;
3318 const u1* inner_classes_attribute_start = NULL;
3319 u4 inner_classes_attribute_length = 0;
3320 u2 enclosing_method_class_index = 0;
3321 u2 enclosing_method_method_index = 0;
3322 const u1* nest_members_attribute_start = NULL;
3323 u4 nest_members_attribute_length = 0;
3324
3325 // Iterate over attributes
3326 while (attributes_count--) {
3327 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3328 const u2 attribute_name_index = cfs->get_u2_fast();
3329 const u4 attribute_length = cfs->get_u4_fast();
3330 check_property(
3331 valid_symbol_at(attribute_name_index),
3332 "Attribute name has bad constant pool index %u in class file %s",
3333 attribute_name_index, CHECK);
3334 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3335 if (tag == vmSymbols::tag_source_file()) {
3336 // Check for SourceFile tag
3337 if (_need_verify) {
3338 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3339 }
3340 if (parsed_sourcefile_attribute) {
3341 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3342 } else {
3343 parsed_sourcefile_attribute = true;
3344 }
3345 parse_classfile_sourcefile_attribute(cfs, CHECK);
3346 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3347 // Check for SourceDebugExtension tag
3348 if (parsed_source_debug_ext_annotations_exist) {
3349 classfile_parse_error(
3350 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3351 }
3352 parsed_source_debug_ext_annotations_exist = true;
3353 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3354 } else if (tag == vmSymbols::tag_inner_classes()) {
3355 // Check for InnerClasses tag
3356 if (parsed_innerclasses_attribute) {
3357 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3358 } else {
3359 parsed_innerclasses_attribute = true;
3360 }
3361 inner_classes_attribute_start = cfs->current();
3362 inner_classes_attribute_length = attribute_length;
3363 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3364 } else if (tag == vmSymbols::tag_nest_members()) {
3365 // Check for NestMembers tag
3366 if (parsed_nest_members_attribute) {
3367 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK);
3368 } else {
3369 parsed_nest_members_attribute = true;
3370 }
3371 if (parsed_nest_host_attribute) {
3372 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK);
3373 }
3374 nest_members_attribute_start = cfs->current();
3375 nest_members_attribute_length = attribute_length;
3376 cfs->skip_u1(nest_members_attribute_length, CHECK);
3377 } else if (tag == vmSymbols::tag_nest_host()) {
3378 if (parsed_nest_host_attribute) {
3379 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK);
3380 } else {
3381 parsed_nest_host_attribute = true;
3382 }
3383 if (parsed_nest_members_attribute) {
3384 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK);
3385 }
3386 cfs->guarantee_more(2, CHECK);
3387 u2 class_info_index = cfs->get_u2_fast();
3388 check_property(
3389 valid_klass_reference_at(class_info_index),
3390 "Nest-host class_info_index %u has bad constant type in class file %s",
3391 class_info_index, CHECK);
3392 _nest_host = class_info_index;
3393 } else if (tag == vmSymbols::tag_synthetic()) {
3394 // Check for Synthetic tag
3395 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3396 if (attribute_length != 0) {
3397 classfile_parse_error(
3398 "Invalid Synthetic classfile attribute length %u in class file %s",
3399 attribute_length, CHECK);
3400 }
3401 parse_classfile_synthetic_attribute(CHECK);
3402 } else if (tag == vmSymbols::tag_deprecated()) {
3403 // Check for Deprecatd tag - 4276120
3404 if (attribute_length != 0) {
3405 classfile_parse_error(
3406 "Invalid Deprecated classfile attribute length %u in class file %s",
3407 attribute_length, CHECK);
3408 }
3409 } else if (_major_version >= JAVA_1_5_VERSION) {
3410 if (tag == vmSymbols::tag_signature()) {
3411 if (_generic_signature_index != 0) {
3412 classfile_parse_error(
3413 "Multiple Signature attributes in class file %s", CHECK);
3414 }
3415 if (attribute_length != 2) {
3416 classfile_parse_error(
3417 "Wrong Signature attribute length %u in class file %s",
3418 attribute_length, CHECK);
3419 }
3420 parse_classfile_signature_attribute(cfs, CHECK);
3421 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3422 if (runtime_visible_annotations != NULL) {
3423 classfile_parse_error(
3424 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3425 }
3426 runtime_visible_annotations_length = attribute_length;
3427 runtime_visible_annotations = cfs->current();
3428 assert(runtime_visible_annotations != NULL, "null visible annotations");
3429 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3430 parse_annotations(cp,
3431 runtime_visible_annotations,
3432 runtime_visible_annotations_length,
3433 parsed_annotations,
3434 _loader_data,
3435 CHECK);
3436 cfs->skip_u1_fast(runtime_visible_annotations_length);
3437 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3438 if (runtime_invisible_annotations_exists) {
3439 classfile_parse_error(
3440 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3441 }
3442 runtime_invisible_annotations_exists = true;
3443 if (PreserveAllAnnotations) {
3444 runtime_invisible_annotations_length = attribute_length;
3445 runtime_invisible_annotations = cfs->current();
3446 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3447 }
3448 cfs->skip_u1(attribute_length, CHECK);
3449 } else if (tag == vmSymbols::tag_enclosing_method()) {
3450 if (parsed_enclosingmethod_attribute) {
3451 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3452 } else {
3453 parsed_enclosingmethod_attribute = true;
3454 }
3455 guarantee_property(attribute_length == 4,
3456 "Wrong EnclosingMethod attribute length %u in class file %s",
3457 attribute_length, CHECK);
3458 cfs->guarantee_more(4, CHECK); // class_index, method_index
3459 enclosing_method_class_index = cfs->get_u2_fast();
3460 enclosing_method_method_index = cfs->get_u2_fast();
3461 if (enclosing_method_class_index == 0) {
3462 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3463 }
3464 // Validate the constant pool indices and types
3465 check_property(valid_klass_reference_at(enclosing_method_class_index),
3466 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3467 if (enclosing_method_method_index != 0 &&
3468 (!cp->is_within_bounds(enclosing_method_method_index) ||
3469 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3470 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3471 }
3472 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3473 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3474 if (parsed_bootstrap_methods_attribute) {
3475 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3476 }
3477 parsed_bootstrap_methods_attribute = true;
3478 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3479 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3480 if (runtime_visible_type_annotations != NULL) {
3481 classfile_parse_error(
3482 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3483 }
3484 runtime_visible_type_annotations_length = attribute_length;
3485 runtime_visible_type_annotations = cfs->current();
3486 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3487 // No need for the VM to parse Type annotations
3488 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3489 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3490 if (runtime_invisible_type_annotations_exists) {
3491 classfile_parse_error(
3492 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3493 } else {
3494 runtime_invisible_type_annotations_exists = true;
3495 }
3496 if (PreserveAllAnnotations) {
3497 runtime_invisible_type_annotations_length = attribute_length;
3498 runtime_invisible_type_annotations = cfs->current();
3499 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3500 }
3501 cfs->skip_u1(attribute_length, CHECK);
3502 } else {
3503 // Unknown attribute
3504 cfs->skip_u1(attribute_length, CHECK);
3505 }
3506 } else {
3507 // Unknown attribute
3508 cfs->skip_u1(attribute_length, CHECK);
3509 }
3510 }
3511 _annotations = assemble_annotations(runtime_visible_annotations,
3512 runtime_visible_annotations_length,
3513 runtime_invisible_annotations,
3514 runtime_invisible_annotations_length,
3515 CHECK);
3516 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3517 runtime_visible_type_annotations_length,
3518 runtime_invisible_type_annotations,
3519 runtime_invisible_type_annotations_length,
3520 CHECK);
3521
3522 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3523 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3524 cfs,
3525 inner_classes_attribute_start,
3526 parsed_innerclasses_attribute,
3527 enclosing_method_class_index,
3528 enclosing_method_method_index,
3529 CHECK);
3530 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3531 guarantee_property(
3532 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3533 "Wrong InnerClasses attribute length in class file %s", CHECK);
3534 }
3535 }
3536
3537 if (parsed_nest_members_attribute) {
3538 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3539 cfs,
3540 nest_members_attribute_start,
3541 CHECK);
3542 if (_need_verify && _major_version >= JAVA_10_VERSION) {
3543 guarantee_property(
3544 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3545 "Wrong NestMembers attribute length in class file %s", CHECK);
3546 }
3547 }
3548
3549 if (_max_bootstrap_specifier_index >= 0) {
3550 guarantee_property(parsed_bootstrap_methods_attribute,
3551 "Missing BootstrapMethods attribute in class file %s", CHECK);
3552 }
3553 }
3554
3555 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3556 assert(k != NULL, "invariant");
3557
3558 if (_synthetic_flag)
3559 k->set_is_synthetic();
3560 if (_sourcefile_index != 0) {
3561 k->set_source_file_name_index(_sourcefile_index);
3562 }
3563 if (_generic_signature_index != 0) {
3564 k->set_generic_signature_index(_generic_signature_index);
3565 }
3566 if (_sde_buffer != NULL) {
3567 k->set_source_debug_extension(_sde_buffer, _sde_length);
3568 }
3569 }
3570
3571 // Create the Annotations object that will
3572 // hold the annotations array for the Klass.
3573 void ClassFileParser::create_combined_annotations(TRAPS) {
3574 if (_annotations == NULL &&
3575 _type_annotations == NULL &&
3576 _fields_annotations == NULL &&
3577 _fields_type_annotations == NULL) {
3578 // Don't create the Annotations object unnecessarily.
3579 return;
3580 }
3581
3582 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3583 annotations->set_class_annotations(_annotations);
3584 annotations->set_class_type_annotations(_type_annotations);
3585 annotations->set_fields_annotations(_fields_annotations);
3586 annotations->set_fields_type_annotations(_fields_type_annotations);
3587
3588 // This is the Annotations object that will be
3589 // assigned to InstanceKlass being constructed.
3590 _combined_annotations = annotations;
3591
3592 // The annotations arrays below has been transfered the
3593 // _combined_annotations so these fields can now be cleared.
3594 _annotations = NULL;
3595 _type_annotations = NULL;
3596 _fields_annotations = NULL;
3597 _fields_type_annotations = NULL;
3598 }
3599
3600 // Transfer ownership of metadata allocated to the InstanceKlass.
3601 void ClassFileParser::apply_parsed_class_metadata(
3602 InstanceKlass* this_klass,
3603 int java_fields_count, TRAPS) {
3604 assert(this_klass != NULL, "invariant");
3605
3606 _cp->set_pool_holder(this_klass);
3607 this_klass->set_constants(_cp);
3608 this_klass->set_fields(_fields, java_fields_count);
3609 this_klass->set_methods(_methods);
3610 this_klass->set_inner_classes(_inner_classes);
3611 this_klass->set_nest_members(_nest_members);
3612 this_klass->set_nest_host_index(_nest_host);
3613 this_klass->set_local_interfaces(_local_interfaces);
3614 this_klass->set_transitive_interfaces(_transitive_interfaces);
3615 this_klass->set_annotations(_combined_annotations);
3616
3617 // Clear out these fields so they don't get deallocated by the destructor
3618 clear_class_metadata();
3619 }
3620
3621 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3622 int runtime_visible_annotations_length,
3623 const u1* const runtime_invisible_annotations,
3624 int runtime_invisible_annotations_length,
3625 TRAPS) {
3626 AnnotationArray* annotations = NULL;
3627 if (runtime_visible_annotations != NULL ||
3628 runtime_invisible_annotations != NULL) {
3629 annotations = MetadataFactory::new_array<u1>(_loader_data,
3630 runtime_visible_annotations_length +
3631 runtime_invisible_annotations_length,
3632 CHECK_(annotations));
3633 if (runtime_visible_annotations != NULL) {
3634 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3635 annotations->at_put(i, runtime_visible_annotations[i]);
3636 }
3637 }
3638 if (runtime_invisible_annotations != NULL) {
3639 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3640 int append = runtime_visible_annotations_length+i;
3641 annotations->at_put(append, runtime_invisible_annotations[i]);
3642 }
3643 }
3644 }
3645 return annotations;
3646 }
3647
3648 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3649 const int super_class_index,
3650 const bool need_verify,
3651 TRAPS) {
3652 assert(cp != NULL, "invariant");
3653 const InstanceKlass* super_klass = NULL;
3654
3655 if (super_class_index == 0) {
3656 check_property(_class_name == vmSymbols::java_lang_Object(),
3657 "Invalid superclass index %u in class file %s",
3658 super_class_index,
3659 CHECK_NULL);
3660 } else {
3661 check_property(valid_klass_reference_at(super_class_index),
3662 "Invalid superclass index %u in class file %s",
3663 super_class_index,
3664 CHECK_NULL);
3665 // The class name should be legal because it is checked when parsing constant pool.
3666 // However, make sure it is not an array type.
3667 bool is_array = false;
3668 if (cp->tag_at(super_class_index).is_klass()) {
3669 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3670 if (need_verify)
3671 is_array = super_klass->is_array_klass();
3672 } else if (need_verify) {
3673 is_array = (cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3674 }
3675 if (need_verify) {
3676 guarantee_property(!is_array,
3677 "Bad superclass name in class file %s", CHECK_NULL);
3678 }
3679 }
3680 return super_klass;
3681 }
3682
3683 static unsigned int compute_oop_map_count(const InstanceKlass* super,
3684 unsigned int nonstatic_oop_map_count,
3685 int first_nonstatic_oop_offset) {
3686
3687 unsigned int map_count =
3688 NULL == super ? 0 : super->nonstatic_oop_map_count();
3689 if (nonstatic_oop_map_count > 0) {
3690 // We have oops to add to map
3691 if (map_count == 0) {
3692 map_count = nonstatic_oop_map_count;
3693 }
3694 else {
3695 // Check whether we should add a new map block or whether the last one can
3696 // be extended
3697 const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3698 const OopMapBlock* const last_map = first_map + map_count - 1;
3699
3700 const int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3701 if (next_offset == first_nonstatic_oop_offset) {
3702 // There is no gap bettwen superklass's last oop field and first
3703 // local oop field, merge maps.
3704 nonstatic_oop_map_count -= 1;
3705 }
3706 else {
3707 // Superklass didn't end with a oop field, add extra maps
3708 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3709 }
3710 map_count += nonstatic_oop_map_count;
3711 }
3712 }
3713 return map_count;
3714 }
3715
3716 #ifndef PRODUCT
3717 static void print_field_layout(const Symbol* name,
3718 Array<u2>* fields,
3719 const constantPoolHandle& cp,
3720 int instance_size,
3721 int instance_fields_start,
3722 int instance_fields_end,
3723 int static_fields_end) {
3724
3725 assert(name != NULL, "invariant");
3726
3727 tty->print("%s: field layout\n", name->as_klass_external_name());
3728 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3729 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3730 if (!fs.access_flags().is_static()) {
3731 tty->print(" @%3d \"%s\" %s\n",
3732 fs.offset(),
3733 fs.name()->as_klass_external_name(),
3734 fs.signature()->as_klass_external_name());
3735 }
3736 }
3737 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3738 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3739 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3740 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3741 if (fs.access_flags().is_static()) {
3742 tty->print(" @%3d \"%s\" %s\n",
3743 fs.offset(),
3744 fs.name()->as_klass_external_name(),
3745 fs.signature()->as_klass_external_name());
3746 }
3747 }
3748 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3749 tty->print("\n");
3750 }
3751 #endif
3752
3753 // Values needed for oopmap and InstanceKlass creation
3754 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3755 public:
3756 int* nonstatic_oop_offsets;
3757 unsigned int* nonstatic_oop_counts;
3758 unsigned int nonstatic_oop_map_count;
3759 unsigned int total_oop_map_count;
3760 int instance_size;
3761 int nonstatic_field_size;
3762 int static_field_size;
3763 bool has_nonstatic_fields;
3764 };
3765
3766 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3767 void ClassFileParser::layout_fields(ConstantPool* cp,
3768 const FieldAllocationCount* fac,
3769 const ClassAnnotationCollector* parsed_annotations,
3770 FieldLayoutInfo* info,
3771 TRAPS) {
3772
3773 assert(cp != NULL, "invariant");
3774
3775 // Field size and offset computation
3776 int nonstatic_field_size = _super_klass == NULL ? 0 :
3777 _super_klass->nonstatic_field_size();
3778
3779 // Count the contended fields by type.
3780 //
3781 // We ignore static fields, because @Contended is not supported for them.
3782 // The layout code below will also ignore the static fields.
3783 int nonstatic_contended_count = 0;
3784 FieldAllocationCount fac_contended;
3785 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3786 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3787 if (fs.is_contended()) {
3788 fac_contended.count[atype]++;
3789 if (!fs.access_flags().is_static()) {
3790 nonstatic_contended_count++;
3791 }
3792 }
3793 }
3794
3795
3796 // Calculate the starting byte offsets
3797 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3798 int next_static_double_offset = next_static_oop_offset +
3799 ((fac->count[STATIC_OOP]) * heapOopSize);
3800 if ( fac->count[STATIC_DOUBLE] &&
3801 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3802 Universe::field_type_should_be_aligned(T_LONG)) ) {
3803 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
3804 }
3805
3806 int next_static_word_offset = next_static_double_offset +
3807 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3808 int next_static_short_offset = next_static_word_offset +
3809 ((fac->count[STATIC_WORD]) * BytesPerInt);
3810 int next_static_byte_offset = next_static_short_offset +
3811 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3812
3813 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3814 nonstatic_field_size * heapOopSize;
3815
3816 int next_nonstatic_field_offset = nonstatic_fields_start;
3817
3818 const bool is_contended_class = parsed_annotations->is_contended();
3819
3820 // Class is contended, pad before all the fields
3821 if (is_contended_class) {
3822 next_nonstatic_field_offset += ContendedPaddingWidth;
3823 }
3824
3825 // Compute the non-contended fields count.
3826 // The packing code below relies on these counts to determine if some field
3827 // can be squeezed into the alignment gap. Contended fields are obviously
3828 // exempt from that.
3829 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3830 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3831 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3832 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3833 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3834
3835 // Total non-static fields count, including every contended field
3836 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3837 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3838 fac->count[NONSTATIC_OOP];
3839
3840 const bool super_has_nonstatic_fields =
3841 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
3842 const bool has_nonstatic_fields =
3843 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3844
3845
3846 // Prepare list of oops for oop map generation.
3847 //
3848 // "offset" and "count" lists are describing the set of contiguous oop
3849 // regions. offset[i] is the start of the i-th region, which then has
3850 // count[i] oops following. Before we know how many regions are required,
3851 // we pessimistically allocate the maps to fit all the oops into the
3852 // distinct regions.
3853 //
3854 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3855 // to figure out if we still need to do this.
3856 unsigned int nonstatic_oop_map_count = 0;
3857 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3858
3859 int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3860 THREAD, int, max_nonstatic_oop_maps);
3861 unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3862 THREAD, unsigned int, max_nonstatic_oop_maps);
3863
3864 int first_nonstatic_oop_offset = 0; // will be set for first oop field
3865
3866 bool compact_fields = CompactFields;
3867 int allocation_style = FieldsAllocationStyle;
3868 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3869 assert(false, "0 <= FieldsAllocationStyle <= 2");
3870 allocation_style = 1; // Optimistic
3871 }
3872
3873 // The next classes have predefined hard-coded fields offsets
3874 // (see in JavaClasses::compute_hard_coded_offsets()).
3875 // Use default fields allocation order for them.
3876 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
3877 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3878 _class_name == vmSymbols::java_lang_Class() ||
3879 _class_name == vmSymbols::java_lang_ClassLoader() ||
3880 _class_name == vmSymbols::java_lang_ref_Reference() ||
3881 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3882 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3883 _class_name == vmSymbols::java_lang_String() ||
3884 _class_name == vmSymbols::java_lang_Throwable() ||
3885 _class_name == vmSymbols::java_lang_Boolean() ||
3886 _class_name == vmSymbols::java_lang_Character() ||
3887 _class_name == vmSymbols::java_lang_Float() ||
3888 _class_name == vmSymbols::java_lang_Double() ||
3889 _class_name == vmSymbols::java_lang_Byte() ||
3890 _class_name == vmSymbols::java_lang_Short() ||
3891 _class_name == vmSymbols::java_lang_Integer() ||
3892 _class_name == vmSymbols::java_lang_Long())) {
3893 allocation_style = 0; // Allocate oops first
3894 compact_fields = false; // Don't compact fields
3895 }
3896
3897 int next_nonstatic_oop_offset = 0;
3898 int next_nonstatic_double_offset = 0;
3899
3900 // Rearrange fields for a given allocation style
3901 if( allocation_style == 0 ) {
3902 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3903 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3904 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3905 (nonstatic_oop_count * heapOopSize);
3906 } else if( allocation_style == 1 ) {
3907 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3908 next_nonstatic_double_offset = next_nonstatic_field_offset;
3909 } else if( allocation_style == 2 ) {
3910 // Fields allocation: oops fields in super and sub classes are together.
3911 if( nonstatic_field_size > 0 && _super_klass != NULL &&
3912 _super_klass->nonstatic_oop_map_size() > 0 ) {
3913 const unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3914 const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps();
3915 const OopMapBlock* const last_map = first_map + map_count - 1;
3916 const int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3917 if (next_offset == next_nonstatic_field_offset) {
3918 allocation_style = 0; // allocate oops first
3919 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3920 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3921 (nonstatic_oop_count * heapOopSize);
3922 }
3923 }
3924 if( allocation_style == 2 ) {
3925 allocation_style = 1; // allocate oops last
3926 next_nonstatic_double_offset = next_nonstatic_field_offset;
3927 }
3928 } else {
3929 ShouldNotReachHere();
3930 }
3931
3932 int nonstatic_oop_space_count = 0;
3933 int nonstatic_word_space_count = 0;
3934 int nonstatic_short_space_count = 0;
3935 int nonstatic_byte_space_count = 0;
3936 int nonstatic_oop_space_offset = 0;
3937 int nonstatic_word_space_offset = 0;
3938 int nonstatic_short_space_offset = 0;
3939 int nonstatic_byte_space_offset = 0;
3940
3941 // Try to squeeze some of the fields into the gaps due to
3942 // long/double alignment.
3943 if (nonstatic_double_count > 0) {
3944 int offset = next_nonstatic_double_offset;
3945 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
3946 if (compact_fields && offset != next_nonstatic_double_offset) {
3947 // Allocate available fields into the gap before double field.
3948 int length = next_nonstatic_double_offset - offset;
3949 assert(length == BytesPerInt, "");
3950 nonstatic_word_space_offset = offset;
3951 if (nonstatic_word_count > 0) {
3952 nonstatic_word_count -= 1;
3953 nonstatic_word_space_count = 1; // Only one will fit
3954 length -= BytesPerInt;
3955 offset += BytesPerInt;
3956 }
3957 nonstatic_short_space_offset = offset;
3958 while (length >= BytesPerShort && nonstatic_short_count > 0) {
3959 nonstatic_short_count -= 1;
3960 nonstatic_short_space_count += 1;
3961 length -= BytesPerShort;
3962 offset += BytesPerShort;
3963 }
3964 nonstatic_byte_space_offset = offset;
3965 while (length > 0 && nonstatic_byte_count > 0) {
3966 nonstatic_byte_count -= 1;
3967 nonstatic_byte_space_count += 1;
3968 length -= 1;
3969 }
3970 // Allocate oop field in the gap if there are no other fields for that.
3971 nonstatic_oop_space_offset = offset;
3972 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
3973 allocation_style != 0) { // when oop fields not first
3974 nonstatic_oop_count -= 1;
3975 nonstatic_oop_space_count = 1; // Only one will fit
3976 length -= heapOopSize;
3977 offset += heapOopSize;
3978 }
3979 }
3980 }
3981
3982 int next_nonstatic_word_offset = next_nonstatic_double_offset +
3983 (nonstatic_double_count * BytesPerLong);
3984 int next_nonstatic_short_offset = next_nonstatic_word_offset +
3985 (nonstatic_word_count * BytesPerInt);
3986 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
3987 (nonstatic_short_count * BytesPerShort);
3988 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3989 nonstatic_byte_count;
3990
3991 // let oops jump before padding with this allocation style
3992 if( allocation_style == 1 ) {
3993 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3994 if( nonstatic_oop_count > 0 ) {
3995 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
3996 }
3997 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3998 }
3999
4000 // Iterate over fields again and compute correct offsets.
4001 // The field allocation type was temporarily stored in the offset slot.
4002 // oop fields are located before non-oop fields (static and non-static).
4003 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4004
4005 // skip already laid out fields
4006 if (fs.is_offset_set()) continue;
4007
4008 // contended instance fields are handled below
4009 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4010
4011 int real_offset = 0;
4012 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4013
4014 // pack the rest of the fields
4015 switch (atype) {
4016 case STATIC_OOP:
4017 real_offset = next_static_oop_offset;
4018 next_static_oop_offset += heapOopSize;
4019 break;
4020 case STATIC_BYTE:
4021 real_offset = next_static_byte_offset;
4022 next_static_byte_offset += 1;
4023 break;
4024 case STATIC_SHORT:
4025 real_offset = next_static_short_offset;
4026 next_static_short_offset += BytesPerShort;
4027 break;
4028 case STATIC_WORD:
4029 real_offset = next_static_word_offset;
4030 next_static_word_offset += BytesPerInt;
4031 break;
4032 case STATIC_DOUBLE:
4033 real_offset = next_static_double_offset;
4034 next_static_double_offset += BytesPerLong;
4035 break;
4036 case NONSTATIC_OOP:
4037 if( nonstatic_oop_space_count > 0 ) {
4038 real_offset = nonstatic_oop_space_offset;
4039 nonstatic_oop_space_offset += heapOopSize;
4040 nonstatic_oop_space_count -= 1;
4041 } else {
4042 real_offset = next_nonstatic_oop_offset;
4043 next_nonstatic_oop_offset += heapOopSize;
4044 }
4045
4046 // Record this oop in the oop maps
4047 if( nonstatic_oop_map_count > 0 &&
4048 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4049 real_offset -
4050 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4051 heapOopSize ) {
4052 // This oop is adjacent to the previous one, add to current oop map
4053 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4054 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4055 } else {
4056 // This oop is not adjacent to the previous one, create new oop map
4057 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4058 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4059 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4060 nonstatic_oop_map_count += 1;
4061 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4062 first_nonstatic_oop_offset = real_offset;
4063 }
4064 }
4065 break;
4066 case NONSTATIC_BYTE:
4067 if( nonstatic_byte_space_count > 0 ) {
4068 real_offset = nonstatic_byte_space_offset;
4069 nonstatic_byte_space_offset += 1;
4070 nonstatic_byte_space_count -= 1;
4071 } else {
4072 real_offset = next_nonstatic_byte_offset;
4073 next_nonstatic_byte_offset += 1;
4074 }
4075 break;
4076 case NONSTATIC_SHORT:
4077 if( nonstatic_short_space_count > 0 ) {
4078 real_offset = nonstatic_short_space_offset;
4079 nonstatic_short_space_offset += BytesPerShort;
4080 nonstatic_short_space_count -= 1;
4081 } else {
4082 real_offset = next_nonstatic_short_offset;
4083 next_nonstatic_short_offset += BytesPerShort;
4084 }
4085 break;
4086 case NONSTATIC_WORD:
4087 if( nonstatic_word_space_count > 0 ) {
4088 real_offset = nonstatic_word_space_offset;
4089 nonstatic_word_space_offset += BytesPerInt;
4090 nonstatic_word_space_count -= 1;
4091 } else {
4092 real_offset = next_nonstatic_word_offset;
4093 next_nonstatic_word_offset += BytesPerInt;
4094 }
4095 break;
4096 case NONSTATIC_DOUBLE:
4097 real_offset = next_nonstatic_double_offset;
4098 next_nonstatic_double_offset += BytesPerLong;
4099 break;
4100 default:
4101 ShouldNotReachHere();
4102 }
4103 fs.set_offset(real_offset);
4104 }
4105
4106
4107 // Handle the contended cases.
4108 //
4109 // Each contended field should not intersect the cache line with another contended field.
4110 // In the absence of alignment information, we end up with pessimistically separating
4111 // the fields with full-width padding.
4112 //
4113 // Additionally, this should not break alignment for the fields, so we round the alignment up
4114 // for each field.
4115 if (nonstatic_contended_count > 0) {
4116
4117 // if there is at least one contended field, we need to have pre-padding for them
4118 next_nonstatic_padded_offset += ContendedPaddingWidth;
4119
4120 // collect all contended groups
4121 ResourceBitMap bm(cp->size());
4122 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4123 // skip already laid out fields
4124 if (fs.is_offset_set()) continue;
4125
4126 if (fs.is_contended()) {
4127 bm.set_bit(fs.contended_group());
4128 }
4129 }
4130
4131 int current_group = -1;
4132 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4133
4134 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4135
4136 // skip already laid out fields
4137 if (fs.is_offset_set()) continue;
4138
4139 // skip non-contended fields and fields from different group
4140 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4141
4142 // handle statics below
4143 if (fs.access_flags().is_static()) continue;
4144
4145 int real_offset = 0;
4146 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4147
4148 switch (atype) {
4149 case NONSTATIC_BYTE:
4150 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4151 real_offset = next_nonstatic_padded_offset;
4152 next_nonstatic_padded_offset += 1;
4153 break;
4154
4155 case NONSTATIC_SHORT:
4156 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4157 real_offset = next_nonstatic_padded_offset;
4158 next_nonstatic_padded_offset += BytesPerShort;
4159 break;
4160
4161 case NONSTATIC_WORD:
4162 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4163 real_offset = next_nonstatic_padded_offset;
4164 next_nonstatic_padded_offset += BytesPerInt;
4165 break;
4166
4167 case NONSTATIC_DOUBLE:
4168 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4169 real_offset = next_nonstatic_padded_offset;
4170 next_nonstatic_padded_offset += BytesPerLong;
4171 break;
4172
4173 case NONSTATIC_OOP:
4174 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4175 real_offset = next_nonstatic_padded_offset;
4176 next_nonstatic_padded_offset += heapOopSize;
4177
4178 // Record this oop in the oop maps
4179 if( nonstatic_oop_map_count > 0 &&
4180 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4181 real_offset -
4182 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4183 heapOopSize ) {
4184 // This oop is adjacent to the previous one, add to current oop map
4185 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4186 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4187 } else {
4188 // This oop is not adjacent to the previous one, create new oop map
4189 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4190 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4191 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4192 nonstatic_oop_map_count += 1;
4193 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4194 first_nonstatic_oop_offset = real_offset;
4195 }
4196 }
4197 break;
4198
4199 default:
4200 ShouldNotReachHere();
4201 }
4202
4203 if (fs.contended_group() == 0) {
4204 // Contended group defines the equivalence class over the fields:
4205 // the fields within the same contended group are not inter-padded.
4206 // The only exception is default group, which does not incur the
4207 // equivalence, and so requires intra-padding.
4208 next_nonstatic_padded_offset += ContendedPaddingWidth;
4209 }
4210
4211 fs.set_offset(real_offset);
4212 } // for
4213
4214 // Start laying out the next group.
4215 // Note that this will effectively pad the last group in the back;
4216 // this is expected to alleviate memory contention effects for
4217 // subclass fields and/or adjacent object.
4218 // If this was the default group, the padding is already in place.
4219 if (current_group != 0) {
4220 next_nonstatic_padded_offset += ContendedPaddingWidth;
4221 }
4222 }
4223
4224 // handle static fields
4225 }
4226
4227 // Entire class is contended, pad in the back.
4228 // This helps to alleviate memory contention effects for subclass fields
4229 // and/or adjacent object.
4230 if (is_contended_class) {
4231 next_nonstatic_padded_offset += ContendedPaddingWidth;
4232 }
4233
4234 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4235
4236 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize);
4237 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4238 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4239
4240 int static_field_size = (static_fields_end -
4241 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4242 nonstatic_field_size = nonstatic_field_size +
4243 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4244
4245 int instance_size = align_object_size(instance_end / wordSize);
4246
4247 assert(instance_size == align_object_size(align_up(
4248 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
4249 wordSize) / wordSize), "consistent layout helper value");
4250
4251 // Invariant: nonstatic_field end/start should only change if there are
4252 // nonstatic fields in the class, or if the class is contended. We compare
4253 // against the non-aligned value, so that end alignment will not fail the
4254 // assert without actually having the fields.
4255 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4256 is_contended_class ||
4257 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4258
4259 // Number of non-static oop map blocks allocated at end of klass.
4260 const unsigned int total_oop_map_count =
4261 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
4262 first_nonstatic_oop_offset);
4263
4264 #ifndef PRODUCT
4265 if (PrintFieldLayout) {
4266 print_field_layout(_class_name,
4267 _fields,
4268 cp,
4269 instance_size,
4270 nonstatic_fields_start,
4271 nonstatic_fields_end,
4272 static_fields_end);
4273 }
4274
4275 #endif
4276 // Pass back information needed for InstanceKlass creation
4277 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
4278 info->nonstatic_oop_counts = nonstatic_oop_counts;
4279 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
4280 info->total_oop_map_count = total_oop_map_count;
4281 info->instance_size = instance_size;
4282 info->static_field_size = static_field_size;
4283 info->nonstatic_field_size = nonstatic_field_size;
4284 info->has_nonstatic_fields = has_nonstatic_fields;
4285 }
4286
4287 static void fill_oop_maps(const InstanceKlass* k,
4288 unsigned int nonstatic_oop_map_count,
4289 const int* nonstatic_oop_offsets,
4290 const unsigned int* nonstatic_oop_counts) {
4291
4292 assert(k != NULL, "invariant");
4293
4294 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4295 const InstanceKlass* const super = k->superklass();
4296 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4297 if (super_count > 0) {
4298 // Copy maps from superklass
4299 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4300 for (unsigned int i = 0; i < super_count; ++i) {
4301 *this_oop_map++ = *super_oop_map++;
4302 }
4303 }
4304
4305 if (nonstatic_oop_map_count > 0) {
4306 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4307 // The counts differ because there is no gap between superklass's last oop
4308 // field and the first local oop field. Extend the last oop map copied
4309 // from the superklass instead of creating new one.
4310 nonstatic_oop_map_count--;
4311 nonstatic_oop_offsets++;
4312 this_oop_map--;
4313 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4314 this_oop_map++;
4315 }
4316
4317 // Add new map blocks, fill them
4318 while (nonstatic_oop_map_count-- > 0) {
4319 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4320 this_oop_map->set_count(*nonstatic_oop_counts++);
4321 this_oop_map++;
4322 }
4323 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4324 this_oop_map, "sanity");
4325 }
4326 }
4327
4328
4329 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4330 assert(ik != NULL, "invariant");
4331
4332 const Klass* const super = ik->super();
4333
4334 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4335 // in which case we don't have to register objects as finalizable
4336 if (!_has_empty_finalizer) {
4337 if (_has_finalizer ||
4338 (super != NULL && super->has_finalizer())) {
4339 ik->set_has_finalizer();
4340 }
4341 }
4342
4343 #ifdef ASSERT
4344 bool f = false;
4345 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4346 vmSymbols::void_method_signature());
4347 if (m != NULL && !m->is_empty_method()) {
4348 f = true;
4349 }
4350
4351 // Spec doesn't prevent agent from redefinition of empty finalizer.
4352 // Despite the fact that it's generally bad idea and redefined finalizer
4353 // will not work as expected we shouldn't abort vm in this case
4354 if (!ik->has_redefined_this_or_super()) {
4355 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4356 }
4357 #endif
4358
4359 // Check if this klass supports the java.lang.Cloneable interface
4360 if (SystemDictionary::Cloneable_klass_loaded()) {
4361 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4362 ik->set_is_cloneable();
4363 }
4364 }
4365
4366 // Check if this klass has a vanilla default constructor
4367 if (super == NULL) {
4368 // java.lang.Object has empty default constructor
4369 ik->set_has_vanilla_constructor();
4370 } else {
4371 if (super->has_vanilla_constructor() &&
4372 _has_vanilla_constructor) {
4373 ik->set_has_vanilla_constructor();
4374 }
4375 #ifdef ASSERT
4376 bool v = false;
4377 if (super->has_vanilla_constructor()) {
4378 const Method* const constructor =
4379 ik->find_method(vmSymbols::object_initializer_name(),
4380 vmSymbols::void_method_signature());
4381 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4382 v = true;
4383 }
4384 }
4385 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4386 #endif
4387 }
4388
4389 // If it cannot be fast-path allocated, set a bit in the layout helper.
4390 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4391 assert(ik->size_helper() > 0, "layout_helper is initialized");
4392 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4393 || ik->is_abstract() || ik->is_interface()
4394 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4395 || ik->size_helper() >= FastAllocateSizeLimit) {
4396 // Forbid fast-path allocation.
4397 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4398 ik->set_layout_helper(lh);
4399 }
4400 }
4401
4402 // Attach super classes and interface classes to class loader data
4403 static void record_defined_class_dependencies(const InstanceKlass* defined_klass,
4404 TRAPS) {
4405 assert(defined_klass != NULL, "invariant");
4406
4407 ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data();
4408 if (defining_loader_data->is_the_null_class_loader_data()) {
4409 // Dependencies to null class loader data are implicit.
4410 return;
4411 } else {
4412 // add super class dependency
4413 Klass* const super = defined_klass->super();
4414 if (super != NULL) {
4415 defining_loader_data->record_dependency(super, CHECK);
4416 }
4417
4418 // add super interface dependencies
4419 const Array<Klass*>* const local_interfaces = defined_klass->local_interfaces();
4420 if (local_interfaces != NULL) {
4421 const int length = local_interfaces->length();
4422 for (int i = 0; i < length; i++) {
4423 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4424 }
4425 }
4426 }
4427 }
4428
4429 // utility methods for appending an array with check for duplicates
4430
4431 static void append_interfaces(GrowableArray<Klass*>* result,
4432 const Array<Klass*>* const ifs) {
4433 // iterate over new interfaces
4434 for (int i = 0; i < ifs->length(); i++) {
4435 Klass* const e = ifs->at(i);
4436 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4437 // add new interface
4438 result->append_if_missing(e);
4439 }
4440 }
4441
4442 static Array<Klass*>* compute_transitive_interfaces(const InstanceKlass* super,
4443 Array<Klass*>* local_ifs,
4444 ClassLoaderData* loader_data,
4445 TRAPS) {
4446 assert(local_ifs != NULL, "invariant");
4447 assert(loader_data != NULL, "invariant");
4448
4449 // Compute maximum size for transitive interfaces
4450 int max_transitive_size = 0;
4451 int super_size = 0;
4452 // Add superclass transitive interfaces size
4453 if (super != NULL) {
4454 super_size = super->transitive_interfaces()->length();
4455 max_transitive_size += super_size;
4456 }
4457 // Add local interfaces' super interfaces
4458 const int local_size = local_ifs->length();
4459 for (int i = 0; i < local_size; i++) {
4460 Klass* const l = local_ifs->at(i);
4461 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4462 }
4463 // Finally add local interfaces
4464 max_transitive_size += local_size;
4465 // Construct array
4466 if (max_transitive_size == 0) {
4467 // no interfaces, use canonicalized array
4468 return Universe::the_empty_klass_array();
4469 } else if (max_transitive_size == super_size) {
4470 // no new local interfaces added, share superklass' transitive interface array
4471 return super->transitive_interfaces();
4472 } else if (max_transitive_size == local_size) {
4473 // only local interfaces added, share local interface array
4474 return local_ifs;
4475 } else {
4476 ResourceMark rm;
4477 GrowableArray<Klass*>* const result = new GrowableArray<Klass*>(max_transitive_size);
4478
4479 // Copy down from superclass
4480 if (super != NULL) {
4481 append_interfaces(result, super->transitive_interfaces());
4482 }
4483
4484 // Copy down from local interfaces' superinterfaces
4485 for (int i = 0; i < local_size; i++) {
4486 Klass* const l = local_ifs->at(i);
4487 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4488 }
4489 // Finally add local interfaces
4490 append_interfaces(result, local_ifs);
4491
4492 // length will be less than the max_transitive_size if duplicates were removed
4493 const int length = result->length();
4494 assert(length <= max_transitive_size, "just checking");
4495 Array<Klass*>* const new_result =
4496 MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL);
4497 for (int i = 0; i < length; i++) {
4498 Klass* const e = result->at(i);
4499 assert(e != NULL, "just checking");
4500 new_result->at_put(i, e);
4501 }
4502 return new_result;
4503 }
4504 }
4505
4506 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4507 assert(this_klass != NULL, "invariant");
4508 const Klass* const super = this_klass->super();
4509 if (super != NULL) {
4510
4511 // If the loader is not the boot loader then throw an exception if its
4512 // superclass is in package jdk.internal.reflect and its loader is not a
4513 // special reflection class loader
4514 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4515 assert(super->is_instance_klass(), "super is not instance klass");
4516 PackageEntry* super_package = super->package();
4517 if (super_package != NULL &&
4518 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4519 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4520 ResourceMark rm(THREAD);
4521 Exceptions::fthrow(
4522 THREAD_AND_LOCATION,
4523 vmSymbols::java_lang_IllegalAccessError(),
4524 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4525 this_klass->external_name(),
4526 this_klass->class_loader_data()->loader_name(),
4527 super->external_name());
4528 return;
4529 }
4530 }
4531
4532 Reflection::VerifyClassAccessResults vca_result =
4533 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4534 if (vca_result != Reflection::ACCESS_OK) {
4535 ResourceMark rm(THREAD);
4536 char* msg = Reflection::verify_class_access_msg(this_klass,
4537 InstanceKlass::cast(super),
4538 vca_result);
4539 if (msg == NULL) {
4540 Exceptions::fthrow(
4541 THREAD_AND_LOCATION,
4542 vmSymbols::java_lang_IllegalAccessError(),
4543 "class %s cannot access its superclass %s",
4544 this_klass->external_name(),
4545 super->external_name());
4546 } else {
4547 // Add additional message content.
4548 Exceptions::fthrow(
4549 THREAD_AND_LOCATION,
4550 vmSymbols::java_lang_IllegalAccessError(),
4551 "superclass access check failed: %s",
4552 msg);
4553 }
4554 }
4555 }
4556 }
4557
4558
4559 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4560 assert(this_klass != NULL, "invariant");
4561 const Array<Klass*>* const local_interfaces = this_klass->local_interfaces();
4562 const int lng = local_interfaces->length();
4563 for (int i = lng - 1; i >= 0; i--) {
4564 Klass* const k = local_interfaces->at(i);
4565 assert (k != NULL && k->is_interface(), "invalid interface");
4566 Reflection::VerifyClassAccessResults vca_result =
4567 Reflection::verify_class_access(this_klass, InstanceKlass::cast(k), false);
4568 if (vca_result != Reflection::ACCESS_OK) {
4569 ResourceMark rm(THREAD);
4570 char* msg = Reflection::verify_class_access_msg(this_klass,
4571 InstanceKlass::cast(k),
4572 vca_result);
4573 if (msg == NULL) {
4574 Exceptions::fthrow(
4575 THREAD_AND_LOCATION,
4576 vmSymbols::java_lang_IllegalAccessError(),
4577 "class %s cannot access its superinterface %s",
4578 this_klass->external_name(),
4579 k->external_name());
4580 } else {
4581 // Add additional message content.
4582 Exceptions::fthrow(
4583 THREAD_AND_LOCATION,
4584 vmSymbols::java_lang_IllegalAccessError(),
4585 "superinterface check failed: %s",
4586 msg);
4587 }
4588 }
4589 }
4590 }
4591
4592
4593 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4594 assert(this_klass != NULL, "invariant");
4595 const Array<Method*>* const methods = this_klass->methods();
4596 const int num_methods = methods->length();
4597
4598 // go thru each method and check if it overrides a final method
4599 for (int index = 0; index < num_methods; index++) {
4600 const Method* const m = methods->at(index);
4601
4602 // skip private, static, and <init> methods
4603 if ((!m->is_private() && !m->is_static()) &&
4604 (m->name() != vmSymbols::object_initializer_name())) {
4605
4606 const Symbol* const name = m->name();
4607 const Symbol* const signature = m->signature();
4608 const Klass* k = this_klass->super();
4609 const Method* super_m = NULL;
4610 while (k != NULL) {
4611 // skip supers that don't have final methods.
4612 if (k->has_final_method()) {
4613 // lookup a matching method in the super class hierarchy
4614 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4615 if (super_m == NULL) {
4616 break; // didn't find any match; get out
4617 }
4618
4619 if (super_m->is_final() && !super_m->is_static() &&
4620 !super_m->access_flags().is_private() &&
4621 // matching method in super is final, and not static or private
4622 (Reflection::verify_field_access(this_klass,
4623 super_m->method_holder(),
4624 super_m->method_holder(),
4625 super_m->access_flags(), false))
4626 // this class can access super final method and therefore override
4627 ) {
4628 // Propagate any existing exceptions that may have been thrown
4629 if (HAS_PENDING_EXCEPTION) {
4630 return;
4631 }
4632
4633 ResourceMark rm(THREAD);
4634 Exceptions::fthrow(
4635 THREAD_AND_LOCATION,
4636 vmSymbols::java_lang_VerifyError(),
4637 "class %s overrides final method %s.%s%s",
4638 this_klass->external_name(),
4639 super_m->method_holder()->external_name(),
4640 name->as_C_string(),
4641 signature->as_C_string()
4642 );
4643 return;
4644 }
4645
4646 // continue to look from super_m's holder's super.
4647 k = super_m->method_holder()->super();
4648 continue;
4649 }
4650
4651 k = k->super();
4652 }
4653 }
4654 }
4655 }
4656
4657
4658 // assumes that this_klass is an interface
4659 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4660 assert(this_klass != NULL, "invariant");
4661 assert(this_klass->is_interface(), "not an interface");
4662 const Array<Method*>* methods = this_klass->methods();
4663 const int num_methods = methods->length();
4664
4665 for (int index = 0; index < num_methods; index++) {
4666 const Method* const m = methods->at(index);
4667 // if m is static and not the init method, throw a verify error
4668 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4669 ResourceMark rm(THREAD);
4670 Exceptions::fthrow(
4671 THREAD_AND_LOCATION,
4672 vmSymbols::java_lang_VerifyError(),
4673 "Illegal static method %s in interface %s",
4674 m->name()->as_C_string(),
4675 this_klass->external_name()
4676 );
4677 return;
4678 }
4679 }
4680 }
4681
4682 // utility methods for format checking
4683
4684 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4685 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4686 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4687 if (is_module) {
4688 ResourceMark rm(THREAD);
4689 Exceptions::fthrow(
4690 THREAD_AND_LOCATION,
4691 vmSymbols::java_lang_NoClassDefFoundError(),
4692 "%s is not a class because access_flag ACC_MODULE is set",
4693 _class_name->as_C_string());
4694 return;
4695 }
4696
4697 if (!_need_verify) { return; }
4698
4699 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4700 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4701 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4702 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4703 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4704 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4705 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4706
4707 if ((is_abstract && is_final) ||
4708 (is_interface && !is_abstract) ||
4709 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4710 (!is_interface && major_gte_15 && is_annotation)) {
4711 ResourceMark rm(THREAD);
4712 Exceptions::fthrow(
4713 THREAD_AND_LOCATION,
4714 vmSymbols::java_lang_ClassFormatError(),
4715 "Illegal class modifiers in class %s: 0x%X",
4716 _class_name->as_C_string(), flags
4717 );
4718 return;
4719 }
4720 }
4721
4722 static bool has_illegal_visibility(jint flags) {
4723 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4724 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4725 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4726
4727 return ((is_public && is_protected) ||
4728 (is_public && is_private) ||
4729 (is_protected && is_private));
4730 }
4731
4732 static bool is_supported_version(u2 major, u2 minor){
4733 const u2 max_version = JAVA_MAX_SUPPORTED_VERSION;
4734 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4735 (major <= max_version) &&
4736 ((major != max_version) ||
4737 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4738 }
4739
4740 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4741 bool is_interface,
4742 TRAPS) const {
4743 if (!_need_verify) { return; }
4744
4745 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4746 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4747 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4748 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4749 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4750 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4751 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4752 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4753 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4754
4755 bool is_illegal = false;
4756
4757 if (is_interface) {
4758 if (!is_public || !is_static || !is_final || is_private ||
4759 is_protected || is_volatile || is_transient ||
4760 (major_gte_15 && is_enum)) {
4761 is_illegal = true;
4762 }
4763 } else { // not interface
4764 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4765 is_illegal = true;
4766 }
4767 }
4768
4769 if (is_illegal) {
4770 ResourceMark rm(THREAD);
4771 Exceptions::fthrow(
4772 THREAD_AND_LOCATION,
4773 vmSymbols::java_lang_ClassFormatError(),
4774 "Illegal field modifiers in class %s: 0x%X",
4775 _class_name->as_C_string(), flags);
4776 return;
4777 }
4778 }
4779
4780 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4781 bool is_interface,
4782 const Symbol* name,
4783 TRAPS) const {
4784 if (!_need_verify) { return; }
4785
4786 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4787 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4788 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4789 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4790 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4791 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4792 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4793 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4794 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4795 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4796 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4797 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4798 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4799
4800 bool is_illegal = false;
4801
4802 if (is_interface) {
4803 if (major_gte_8) {
4804 // Class file version is JAVA_8_VERSION or later Methods of
4805 // interfaces may set any of the flags except ACC_PROTECTED,
4806 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4807 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4808 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4809 (is_native || is_protected || is_final || is_synchronized) ||
4810 // If a specific method of a class or interface has its
4811 // ACC_ABSTRACT flag set, it must not have any of its
4812 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4813 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4814 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4815 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4816 (is_abstract && (is_private || is_static || is_strict))) {
4817 is_illegal = true;
4818 }
4819 } else if (major_gte_15) {
4820 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4821 if (!is_public || is_private || is_protected || is_static || is_final ||
4822 is_synchronized || is_native || !is_abstract || is_strict) {
4823 is_illegal = true;
4824 }
4825 } else {
4826 // Class file version is pre-JAVA_1_5_VERSION
4827 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4828 is_illegal = true;
4829 }
4830 }
4831 } else { // not interface
4832 if (has_illegal_visibility(flags)) {
4833 is_illegal = true;
4834 } else {
4835 if (is_initializer) {
4836 if (is_static || is_final || is_synchronized || is_native ||
4837 is_abstract || (major_gte_15 && is_bridge)) {
4838 is_illegal = true;
4839 }
4840 } else { // not initializer
4841 if (is_abstract) {
4842 if ((is_final || is_native || is_private || is_static ||
4843 (major_gte_15 && (is_synchronized || is_strict)))) {
4844 is_illegal = true;
4845 }
4846 }
4847 }
4848 }
4849 }
4850
4851 if (is_illegal) {
4852 ResourceMark rm(THREAD);
4853 Exceptions::fthrow(
4854 THREAD_AND_LOCATION,
4855 vmSymbols::java_lang_ClassFormatError(),
4856 "Method %s in class %s has illegal modifiers: 0x%X",
4857 name->as_C_string(), _class_name->as_C_string(), flags);
4858 return;
4859 }
4860 }
4861
4862 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4863 int length,
4864 TRAPS) const {
4865 assert(_need_verify, "only called when _need_verify is true");
4866 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
4867 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4868 }
4869 }
4870
4871 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4872 // In class names, '/' separates unqualified names. This is verified in this function also.
4873 // Method names also may not contain the characters '<' or '>', unless <init>
4874 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4875 // method. Because these names have been checked as special cases before
4876 // calling this method in verify_legal_method_name.
4877 //
4878 // This method is also called from the modular system APIs in modules.cpp
4879 // to verify the validity of module and package names.
4880 bool ClassFileParser::verify_unqualified_name(const char* name,
4881 unsigned int length,
4882 int type) {
4883 for (const char* p = name; p != name + length;) {
4884 jchar ch = *p;
4885 if (ch < 128) {
4886 if (ch == '.' || ch == ';' || ch == '[' ) {
4887 return false; // do not permit '.', ';', or '['
4888 }
4889 if (ch == '/') {
4890 // check for '//' or leading or trailing '/' which are not legal
4891 // unqualified name must not be empty
4892 if (type == ClassFileParser::LegalClass) {
4893 if (p == name || p+1 >= name+length || *(p+1) == '/') {
4894 return false;
4895 }
4896 } else {
4897 return false; // do not permit '/' unless it's class name
4898 }
4899 }
4900 if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) {
4901 return false; // do not permit '<' or '>' in method names
4902 }
4903 p++;
4904 } else {
4905 char* tmp_p = UTF8::next(p, &ch);
4906 p = tmp_p;
4907 }
4908 }
4909 return true;
4910 }
4911
4912 // Take pointer to a string. Skip over the longest part of the string that could
4913 // be taken as a fieldname. Allow '/' if slash_ok is true.
4914 // Return a pointer to just past the fieldname.
4915 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4916 // being true, we saw consecutive slashes (meaning we were looking for a
4917 // qualified path but found something that was badly-formed).
4918 static const char* skip_over_field_name(const char* name,
4919 bool slash_ok,
4920 unsigned int length) {
4921 const char* p;
4922 jboolean last_is_slash = false;
4923 jboolean not_first_ch = false;
4924
4925 for (p = name; p != name + length; not_first_ch = true) {
4926 const char* old_p = p;
4927 jchar ch = *p;
4928 if (ch < 128) {
4929 p++;
4930 // quick check for ascii
4931 if ((ch >= 'a' && ch <= 'z') ||
4932 (ch >= 'A' && ch <= 'Z') ||
4933 (ch == '_' || ch == '$') ||
4934 (not_first_ch && ch >= '0' && ch <= '9')) {
4935 last_is_slash = false;
4936 continue;
4937 }
4938 if (slash_ok && ch == '/') {
4939 if (last_is_slash) {
4940 return NULL; // Don't permit consecutive slashes
4941 }
4942 last_is_slash = true;
4943 continue;
4944 }
4945 }
4946 else {
4947 jint unicode_ch;
4948 char* tmp_p = UTF8::next_character(p, &unicode_ch);
4949 p = tmp_p;
4950 last_is_slash = false;
4951 // Check if ch is Java identifier start or is Java identifier part
4952 // 4672820: call java.lang.Character methods directly without generating separate tables.
4953 EXCEPTION_MARK;
4954
4955 // return value
4956 JavaValue result(T_BOOLEAN);
4957 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4958 JavaCallArguments args;
4959 args.push_int(unicode_ch);
4960
4961 // public static boolean isJavaIdentifierStart(char ch);
4962 JavaCalls::call_static(&result,
4963 SystemDictionary::Character_klass(),
4964 vmSymbols::isJavaIdentifierStart_name(),
4965 vmSymbols::int_bool_signature(),
4966 &args,
4967 THREAD);
4968
4969 if (HAS_PENDING_EXCEPTION) {
4970 CLEAR_PENDING_EXCEPTION;
4971 return 0;
4972 }
4973 if (result.get_jboolean()) {
4974 continue;
4975 }
4976
4977 if (not_first_ch) {
4978 // public static boolean isJavaIdentifierPart(char ch);
4979 JavaCalls::call_static(&result,
4980 SystemDictionary::Character_klass(),
4981 vmSymbols::isJavaIdentifierPart_name(),
4982 vmSymbols::int_bool_signature(),
4983 &args,
4984 THREAD);
4985
4986 if (HAS_PENDING_EXCEPTION) {
4987 CLEAR_PENDING_EXCEPTION;
4988 return 0;
4989 }
4990
4991 if (result.get_jboolean()) {
4992 continue;
4993 }
4994 }
4995 }
4996 return (not_first_ch) ? old_p : NULL;
4997 }
4998 return (not_first_ch) ? p : NULL;
4999 }
5000
5001 // Take pointer to a string. Skip over the longest part of the string that could
5002 // be taken as a field signature. Allow "void" if void_ok.
5003 // Return a pointer to just past the signature.
5004 // Return NULL if no legal signature is found.
5005 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5006 bool void_ok,
5007 unsigned int length,
5008 TRAPS) const {
5009 unsigned int array_dim = 0;
5010 while (length > 0) {
5011 switch (signature[0]) {
5012 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5013 case JVM_SIGNATURE_BOOLEAN:
5014 case JVM_SIGNATURE_BYTE:
5015 case JVM_SIGNATURE_CHAR:
5016 case JVM_SIGNATURE_SHORT:
5017 case JVM_SIGNATURE_INT:
5018 case JVM_SIGNATURE_FLOAT:
5019 case JVM_SIGNATURE_LONG:
5020 case JVM_SIGNATURE_DOUBLE:
5021 return signature + 1;
5022 case JVM_SIGNATURE_CLASS: {
5023 if (_major_version < JAVA_1_5_VERSION) {
5024 // Skip over the class name if one is there
5025 const char* const p = skip_over_field_name(signature + 1, true, --length);
5026
5027 // The next character better be a semicolon
5028 if (p && (p - signature) > 1 && p[0] == ';') {
5029 return p + 1;
5030 }
5031 }
5032 else {
5033 // Skip leading 'L' and ignore first appearance of ';'
5034 length--;
5035 signature++;
5036 char* c = strchr((char*) signature, ';');
5037 // Format check signature
5038 if (c != NULL) {
5039 ResourceMark rm(THREAD);
5040 int newlen = c - (char*) signature;
5041 char* sig = NEW_RESOURCE_ARRAY(char, newlen + 1);
5042 strncpy(sig, signature, newlen);
5043 sig[newlen] = '\0';
5044
5045 bool legal = verify_unqualified_name(sig, newlen, LegalClass);
5046 if (!legal) {
5047 classfile_parse_error("Class name contains illegal character "
5048 "in descriptor in class file %s",
5049 CHECK_0);
5050 return NULL;
5051 }
5052 return signature + newlen + 1;
5053 }
5054 }
5055 return NULL;
5056 }
5057 case JVM_SIGNATURE_ARRAY:
5058 array_dim++;
5059 if (array_dim > 255) {
5060 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5061 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5062 }
5063 // The rest of what's there better be a legal signature
5064 signature++;
5065 length--;
5066 void_ok = false;
5067 break;
5068 default:
5069 return NULL;
5070 }
5071 }
5072 return NULL;
5073 }
5074
5075 // Checks if name is a legal class name.
5076 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5077 if (!_need_verify || _relax_verify) { return; }
5078
5079 char buf[fixed_buffer_size];
5080 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5081 unsigned int length = name->utf8_length();
5082 bool legal = false;
5083
5084 if (length > 0) {
5085 const char* p;
5086 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5087 p = skip_over_field_signature(bytes, false, length, CHECK);
5088 legal = (p != NULL) && ((p - bytes) == (int)length);
5089 } else if (_major_version < JAVA_1_5_VERSION) {
5090 if (bytes[0] != '<') {
5091 p = skip_over_field_name(bytes, true, length);
5092 legal = (p != NULL) && ((p - bytes) == (int)length);
5093 }
5094 } else {
5095 // 4900761: relax the constraints based on JSR202 spec
5096 // Class names may be drawn from the entire Unicode character set.
5097 // Identifiers between '/' must be unqualified names.
5098 // The utf8 string has been verified when parsing cpool entries.
5099 legal = verify_unqualified_name(bytes, length, LegalClass);
5100 }
5101 }
5102 if (!legal) {
5103 ResourceMark rm(THREAD);
5104 assert(_class_name != NULL, "invariant");
5105 Exceptions::fthrow(
5106 THREAD_AND_LOCATION,
5107 vmSymbols::java_lang_ClassFormatError(),
5108 "Illegal class name \"%s\" in class file %s", bytes,
5109 _class_name->as_C_string()
5110 );
5111 return;
5112 }
5113 }
5114
5115 // Checks if name is a legal field name.
5116 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5117 if (!_need_verify || _relax_verify) { return; }
5118
5119 char buf[fixed_buffer_size];
5120 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5121 unsigned int length = name->utf8_length();
5122 bool legal = false;
5123
5124 if (length > 0) {
5125 if (_major_version < JAVA_1_5_VERSION) {
5126 if (bytes[0] != '<') {
5127 const char* p = skip_over_field_name(bytes, false, length);
5128 legal = (p != NULL) && ((p - bytes) == (int)length);
5129 }
5130 } else {
5131 // 4881221: relax the constraints based on JSR202 spec
5132 legal = verify_unqualified_name(bytes, length, LegalField);
5133 }
5134 }
5135
5136 if (!legal) {
5137 ResourceMark rm(THREAD);
5138 assert(_class_name != NULL, "invariant");
5139 Exceptions::fthrow(
5140 THREAD_AND_LOCATION,
5141 vmSymbols::java_lang_ClassFormatError(),
5142 "Illegal field name \"%s\" in class %s", bytes,
5143 _class_name->as_C_string()
5144 );
5145 return;
5146 }
5147 }
5148
5149 // Checks if name is a legal method name.
5150 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5151 if (!_need_verify || _relax_verify) { return; }
5152
5153 assert(name != NULL, "method name is null");
5154 char buf[fixed_buffer_size];
5155 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5156 unsigned int length = name->utf8_length();
5157 bool legal = false;
5158
5159 if (length > 0) {
5160 if (bytes[0] == '<') {
5161 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5162 legal = true;
5163 }
5164 } else if (_major_version < JAVA_1_5_VERSION) {
5165 const char* p;
5166 p = skip_over_field_name(bytes, false, length);
5167 legal = (p != NULL) && ((p - bytes) == (int)length);
5168 } else {
5169 // 4881221: relax the constraints based on JSR202 spec
5170 legal = verify_unqualified_name(bytes, length, LegalMethod);
5171 }
5172 }
5173
5174 if (!legal) {
5175 ResourceMark rm(THREAD);
5176 assert(_class_name != NULL, "invariant");
5177 Exceptions::fthrow(
5178 THREAD_AND_LOCATION,
5179 vmSymbols::java_lang_ClassFormatError(),
5180 "Illegal method name \"%s\" in class %s", bytes,
5181 _class_name->as_C_string()
5182 );
5183 return;
5184 }
5185 }
5186
5187
5188 // Checks if signature is a legal field signature.
5189 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5190 const Symbol* signature,
5191 TRAPS) const {
5192 if (!_need_verify) { return; }
5193
5194 char buf[fixed_buffer_size];
5195 const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5196 const unsigned int length = signature->utf8_length();
5197 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5198
5199 if (p == NULL || (p - bytes) != (int)length) {
5200 throwIllegalSignature("Field", name, signature, CHECK);
5201 }
5202 }
5203
5204 // Checks if signature is a legal method signature.
5205 // Returns number of parameters
5206 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5207 const Symbol* signature,
5208 TRAPS) const {
5209 if (!_need_verify) {
5210 // make sure caller's args_size will be less than 0 even for non-static
5211 // method so it will be recomputed in compute_size_of_parameters().
5212 return -2;
5213 }
5214
5215 // Class initializers cannot have args for class format version >= 51.
5216 if (name == vmSymbols::class_initializer_name() &&
5217 signature != vmSymbols::void_method_signature() &&
5218 _major_version >= JAVA_7_VERSION) {
5219 throwIllegalSignature("Method", name, signature, CHECK_0);
5220 return 0;
5221 }
5222
5223 unsigned int args_size = 0;
5224 char buf[fixed_buffer_size];
5225 const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5226 unsigned int length = signature->utf8_length();
5227 const char* nextp;
5228
5229 // The first character must be a '('
5230 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5231 length--;
5232 // Skip over legal field signatures
5233 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5234 while ((length > 0) && (nextp != NULL)) {
5235 args_size++;
5236 if (p[0] == 'J' || p[0] == 'D') {
5237 args_size++;
5238 }
5239 length -= nextp - p;
5240 p = nextp;
5241 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5242 }
5243 // The first non-signature thing better be a ')'
5244 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5245 length--;
5246 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5247 // All internal methods must return void
5248 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5249 return args_size;
5250 }
5251 } else {
5252 // Now we better just have a return value
5253 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5254 if (nextp && ((int)length == (nextp - p))) {
5255 return args_size;
5256 }
5257 }
5258 }
5259 }
5260 // Report error
5261 throwIllegalSignature("Method", name, signature, CHECK_0);
5262 return 0;
5263 }
5264
5265 int ClassFileParser::static_field_size() const {
5266 assert(_field_info != NULL, "invariant");
5267 return _field_info->static_field_size;
5268 }
5269
5270 int ClassFileParser::total_oop_map_count() const {
5271 assert(_field_info != NULL, "invariant");
5272 return _field_info->total_oop_map_count;
5273 }
5274
5275 jint ClassFileParser::layout_size() const {
5276 assert(_field_info != NULL, "invariant");
5277 return _field_info->instance_size;
5278 }
5279
5280 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5281 const Array<Method*>* methods) {
5282 assert(ik != NULL, "invariant");
5283 assert(methods != NULL, "invariant");
5284
5285 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5286 // (We used to do this lazily, but now we query it in Rewriter,
5287 // which is eagerly done for every method, so we might as well do it now,
5288 // when everything is fresh in memory.)
5289 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5290
5291 if (klass_id != vmSymbols::NO_SID) {
5292 for (int j = 0; j < methods->length(); ++j) {
5293 Method* method = methods->at(j);
5294 method->init_intrinsic_id();
5295
5296 if (CheckIntrinsics) {
5297 // Check if an intrinsic is defined for method 'method',
5298 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5299 if (method->intrinsic_id() != vmIntrinsics::_none &&
5300 !method->intrinsic_candidate()) {
5301 tty->print("Compiler intrinsic is defined for method [%s], "
5302 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5303 method->name_and_sig_as_C_string(),
5304 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5305 );
5306 tty->cr();
5307 DEBUG_ONLY(vm_exit(1));
5308 }
5309 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5310 // but there is no intrinsic available for it.
5311 if (method->intrinsic_candidate() &&
5312 method->intrinsic_id() == vmIntrinsics::_none) {
5313 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5314 "but no compiler intrinsic is defined for the method.%s",
5315 method->name_and_sig_as_C_string(),
5316 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5317 );
5318 tty->cr();
5319 DEBUG_ONLY(vm_exit(1));
5320 }
5321 }
5322 } // end for
5323
5324 #ifdef ASSERT
5325 if (CheckIntrinsics) {
5326 // Check for orphan methods in the current class. A method m
5327 // of a class C is orphan if an intrinsic is defined for method m,
5328 // but class C does not declare m.
5329 // The check is potentially expensive, therefore it is available
5330 // only in debug builds.
5331
5332 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5333 if (vmIntrinsics::_compiledLambdaForm == id) {
5334 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5335 // generated for the JVM from a LambdaForm and therefore no method
5336 // is defined for it.
5337 continue;
5338 }
5339
5340 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5341 // Check if the current class contains a method with the same
5342 // name, flags, signature.
5343 bool match = false;
5344 for (int j = 0; j < methods->length(); ++j) {
5345 const Method* method = methods->at(j);
5346 if (method->intrinsic_id() == id) {
5347 match = true;
5348 break;
5349 }
5350 }
5351
5352 if (!match) {
5353 char buf[1000];
5354 tty->print("Compiler intrinsic is defined for method [%s], "
5355 "but the method is not available in class [%s].%s",
5356 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5357 buf, sizeof(buf)),
5358 ik->name()->as_C_string(),
5359 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5360 );
5361 tty->cr();
5362 DEBUG_ONLY(vm_exit(1));
5363 }
5364 }
5365 } // end for
5366 } // CheckIntrinsics
5367 #endif // ASSERT
5368 }
5369 }
5370
5371 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5372 if (_klass != NULL) {
5373 return _klass;
5374 }
5375
5376 InstanceKlass* const ik =
5377 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5378
5379 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5380
5381 assert(_klass == ik, "invariant");
5382
5383 ik->set_has_passed_fingerprint_check(false);
5384 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5385 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5386 if (aot_fp != 0 && aot_fp == _stream->compute_fingerprint()) {
5387 // This class matches with a class saved in an AOT library
5388 ik->set_has_passed_fingerprint_check(true);
5389 } else {
5390 ResourceMark rm;
5391 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5392 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5393 }
5394 }
5395
5396 return ik;
5397 }
5398
5399 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5400 assert(ik != NULL, "invariant");
5401
5402 set_klass_to_deallocate(ik);
5403
5404 assert(_field_info != NULL, "invariant");
5405 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5406 assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count,
5407 "sanity");
5408
5409 assert(ik->is_instance_klass(), "sanity");
5410 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5411
5412 // Fill in information already parsed
5413 ik->set_should_verify_class(_need_verify);
5414
5415 // Not yet: supers are done below to support the new subtype-checking fields
5416 ik->set_class_loader_data(_loader_data);
5417 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5418 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5419 assert(_fac != NULL, "invariant");
5420 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5421
5422 // this transfers ownership of a lot of arrays from
5423 // the parser onto the InstanceKlass*
5424 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5425
5426 // note that is not safe to use the fields in the parser from this point on
5427 assert(NULL == _cp, "invariant");
5428 assert(NULL == _fields, "invariant");
5429 assert(NULL == _methods, "invariant");
5430 assert(NULL == _inner_classes, "invariant");
5431 assert(NULL == _nest_members, "invariant");
5432 assert(NULL == _local_interfaces, "invariant");
5433 assert(NULL == _transitive_interfaces, "invariant");
5434 assert(NULL == _combined_annotations, "invariant");
5435
5436 if (_has_final_method) {
5437 ik->set_has_final_method();
5438 }
5439
5440 ik->copy_method_ordering(_method_ordering, CHECK);
5441 // The InstanceKlass::_methods_jmethod_ids cache
5442 // is managed on the assumption that the initial cache
5443 // size is equal to the number of methods in the class. If
5444 // that changes, then InstanceKlass::idnum_can_increment()
5445 // has to be changed accordingly.
5446 ik->set_initial_method_idnum(ik->methods()->length());
5447
5448 ik->set_name(_class_name);
5449
5450 if (is_anonymous()) {
5451 // _this_class_index is a CONSTANT_Class entry that refers to this
5452 // anonymous class itself. If this class needs to refer to its own methods or
5453 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5454 // _this_class_index. However, because this class is anonymous (it's
5455 // not stored in SystemDictionary), _this_class_index cannot be resolved
5456 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5457 // Therefore, we must eagerly resolve _this_class_index now.
5458 ik->constants()->klass_at_put(_this_class_index, ik);
5459 }
5460
5461 ik->set_minor_version(_minor_version);
5462 ik->set_major_version(_major_version);
5463 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5464 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5465
5466 if (_host_klass != NULL) {
5467 assert (ik->is_anonymous(), "should be the same");
5468 ik->set_host_klass(_host_klass);
5469 }
5470
5471 // Set PackageEntry for this_klass
5472 oop cl = ik->class_loader();
5473 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5474 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5475 ik->set_package(cld, CHECK);
5476
5477 const Array<Method*>* const methods = ik->methods();
5478 assert(methods != NULL, "invariant");
5479 const int methods_len = methods->length();
5480
5481 check_methods_for_intrinsics(ik, methods);
5482
5483 // Fill in field values obtained by parse_classfile_attributes
5484 if (_parsed_annotations->has_any_annotations()) {
5485 _parsed_annotations->apply_to(ik);
5486 }
5487
5488 apply_parsed_class_attributes(ik);
5489
5490 // Miranda methods
5491 if ((_num_miranda_methods > 0) ||
5492 // if this class introduced new miranda methods or
5493 (_super_klass != NULL && _super_klass->has_miranda_methods())
5494 // super class exists and this class inherited miranda methods
5495 ) {
5496 ik->set_has_miranda_methods(); // then set a flag
5497 }
5498
5499 // Fill in information needed to compute superclasses.
5500 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), CHECK);
5501
5502 // Initialize itable offset tables
5503 klassItable::setup_itable_offset_table(ik);
5504
5505 // Compute transitive closure of interfaces this class implements
5506 // Do final class setup
5507 fill_oop_maps(ik,
5508 _field_info->nonstatic_oop_map_count,
5509 _field_info->nonstatic_oop_offsets,
5510 _field_info->nonstatic_oop_counts);
5511
5512 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5513 set_precomputed_flags(ik);
5514
5515 // check if this class can access its super class
5516 check_super_class_access(ik, CHECK);
5517
5518 // check if this class can access its superinterfaces
5519 check_super_interface_access(ik, CHECK);
5520
5521 // check if this class overrides any final method
5522 check_final_method_override(ik, CHECK);
5523
5524 // reject static interface methods prior to Java 8
5525 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5526 check_illegal_static_method(ik, CHECK);
5527 }
5528
5529 // Obtain this_klass' module entry
5530 ModuleEntry* module_entry = ik->module();
5531 assert(module_entry != NULL, "module_entry should always be set");
5532
5533 // Obtain java.lang.Module
5534 Handle module_handle(THREAD, module_entry->module());
5535
5536 // Allocate mirror and initialize static fields
5537 // The create_mirror() call will also call compute_modifiers()
5538 java_lang_Class::create_mirror(ik,
5539 Handle(THREAD, _loader_data->class_loader()),
5540 module_handle,
5541 _protection_domain,
5542 CHECK);
5543
5544 assert(_all_mirandas != NULL, "invariant");
5545
5546 // Generate any default methods - default methods are public interface methods
5547 // that have a default implementation. This is new with Java 8.
5548 if (_has_nonstatic_concrete_methods) {
5549 DefaultMethods::generate_default_methods(ik,
5550 _all_mirandas,
5551 CHECK);
5552 }
5553
5554 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5555 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5556 !module_entry->has_default_read_edges()) {
5557 if (!module_entry->set_has_default_read_edges()) {
5558 // We won a potential race
5559 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5560 }
5561 }
5562
5563 // Update the loader_data graph.
5564 record_defined_class_dependencies(ik, CHECK);
5565
5566 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5567
5568 if (!is_internal()) {
5569 if (log_is_enabled(Info, class, load)) {
5570 ResourceMark rm;
5571 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5572 ik->print_class_load_logging(_loader_data, module_name, _stream);
5573 }
5574
5575 if (log_is_enabled(Debug, class, resolve)) {
5576 ResourceMark rm;
5577 // print out the superclass.
5578 const char * from = ik->external_name();
5579 if (ik->java_super() != NULL) {
5580 log_debug(class, resolve)("%s %s (super)",
5581 from,
5582 ik->java_super()->external_name());
5583 }
5584 // print out each of the interface classes referred to by this class.
5585 const Array<Klass*>* const local_interfaces = ik->local_interfaces();
5586 if (local_interfaces != NULL) {
5587 const int length = local_interfaces->length();
5588 for (int i = 0; i < length; i++) {
5589 const Klass* const k = local_interfaces->at(i);
5590 const char * to = k->external_name();
5591 log_debug(class, resolve)("%s %s (interface)", from, to);
5592 }
5593 }
5594 }
5595 }
5596
5597 TRACE_INIT_ID(ik);
5598
5599 // If we reach here, all is well.
5600 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5601 // in order for it to not be destroyed in the ClassFileParser destructor.
5602 set_klass_to_deallocate(NULL);
5603
5604 // it's official
5605 set_klass(ik);
5606
5607 debug_only(ik->verify();)
5608 }
5609
5610 // For an anonymous class that is in the unnamed package, move it to its host class's
5611 // package by prepending its host class's package name to its class name and setting
5612 // its _class_name field.
5613 void ClassFileParser::prepend_host_package_name(const InstanceKlass* host_klass, TRAPS) {
5614 ResourceMark rm(THREAD);
5615 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
5616 "Anonymous class should not be in a package");
5617 const char* host_pkg_name =
5618 ClassLoader::package_from_name(host_klass->name()->as_C_string(), NULL);
5619
5620 if (host_pkg_name != NULL) {
5621 size_t host_pkg_len = strlen(host_pkg_name);
5622 int class_name_len = _class_name->utf8_length();
5623 char* new_anon_name =
5624 NEW_RESOURCE_ARRAY(char, host_pkg_len + 1 + class_name_len);
5625 // Copy host package name and trailing /.
5626 strncpy(new_anon_name, host_pkg_name, host_pkg_len);
5627 new_anon_name[host_pkg_len] = '/';
5628 // Append anonymous class name. The anonymous class name can contain odd
5629 // characters. So, do a strncpy instead of using sprintf("%s...").
5630 strncpy(new_anon_name + host_pkg_len + 1, (char *)_class_name->base(), class_name_len);
5631
5632 // Create a symbol and update the anonymous class name.
5633 _class_name = SymbolTable::new_symbol(new_anon_name,
5634 (int)host_pkg_len + 1 + class_name_len,
5635 CHECK);
5636 }
5637 }
5638
5639 // If the host class and the anonymous class are in the same package then do
5640 // nothing. If the anonymous class is in the unnamed package then move it to its
5641 // host's package. If the classes are in different packages then throw an IAE
5642 // exception.
5643 void ClassFileParser::fix_anonymous_class_name(TRAPS) {
5644 assert(_host_klass != NULL, "Expected an anonymous class");
5645
5646 const jbyte* anon_last_slash = UTF8::strrchr(_class_name->base(),
5647 _class_name->utf8_length(), '/');
5648 if (anon_last_slash == NULL) { // Unnamed package
5649 prepend_host_package_name(_host_klass, CHECK);
5650 } else {
5651 if (!_host_klass->is_same_class_package(_host_klass->class_loader(), _class_name)) {
5652 ResourceMark rm(THREAD);
5653 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
5654 err_msg("Host class %s and anonymous class %s are in different packages",
5655 _host_klass->name()->as_C_string(), _class_name->as_C_string()));
5656 }
5657 }
5658 }
5659
5660 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5661 bool trusted = (loader_data->is_the_null_class_loader_data() ||
5662 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
5663 bool need_verify =
5664 // verifyAll
5665 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5666 // verifyRemote
5667 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5668 return !need_verify;
5669 }
5670
5671 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5672 Symbol* name,
5673 ClassLoaderData* loader_data,
5674 Handle protection_domain,
5675 const InstanceKlass* host_klass,
5676 GrowableArray<Handle>* cp_patches,
5677 Publicity pub_level,
5678 TRAPS) :
5679 _stream(stream),
5680 _requested_name(name),
5681 _loader_data(loader_data),
5682 _host_klass(host_klass),
5683 _cp_patches(cp_patches),
5684 _num_patched_klasses(0),
5685 _max_num_patched_klasses(0),
5686 _orig_cp_size(0),
5687 _first_patched_klass_resolved_index(0),
5688 _super_klass(),
5689 _cp(NULL),
5690 _fields(NULL),
5691 _methods(NULL),
5692 _inner_classes(NULL),
5693 _nest_members(NULL),
5694 _nest_host(0),
5695 _local_interfaces(NULL),
5696 _transitive_interfaces(NULL),
5697 _combined_annotations(NULL),
5698 _annotations(NULL),
5699 _type_annotations(NULL),
5700 _fields_annotations(NULL),
5701 _fields_type_annotations(NULL),
5702 _klass(NULL),
5703 _klass_to_deallocate(NULL),
5704 _parsed_annotations(NULL),
5705 _fac(NULL),
5706 _field_info(NULL),
5707 _method_ordering(NULL),
5708 _all_mirandas(NULL),
5709 _vtable_size(0),
5710 _itable_size(0),
5711 _num_miranda_methods(0),
5712 _rt(REF_NONE),
5713 _protection_domain(protection_domain),
5714 _access_flags(),
5715 _pub_level(pub_level),
5716 _bad_constant_seen(0),
5717 _synthetic_flag(false),
5718 _sde_length(false),
5719 _sde_buffer(NULL),
5720 _sourcefile_index(0),
5721 _generic_signature_index(0),
5722 _major_version(0),
5723 _minor_version(0),
5724 _this_class_index(0),
5725 _super_class_index(0),
5726 _itfs_len(0),
5727 _java_fields_count(0),
5728 _need_verify(false),
5729 _relax_verify(false),
5730 _has_nonstatic_concrete_methods(false),
5731 _declares_nonstatic_concrete_methods(false),
5732 _has_final_method(false),
5733 _has_finalizer(false),
5734 _has_empty_finalizer(false),
5735 _has_vanilla_constructor(false),
5736 _max_bootstrap_specifier_index(-1) {
5737
5738 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
5739
5740 assert(THREAD->is_Java_thread(), "invariant");
5741 assert(_loader_data != NULL, "invariant");
5742 assert(stream != NULL, "invariant");
5743 assert(_stream != NULL, "invariant");
5744 assert(_stream->buffer() == _stream->current(), "invariant");
5745 assert(_class_name != NULL, "invariant");
5746 assert(0 == _access_flags.as_int(), "invariant");
5747
5748 // Figure out whether we can skip format checking (matching classic VM behavior)
5749 if (DumpSharedSpaces) {
5750 // verify == true means it's a 'remote' class (i.e., non-boot class)
5751 // Verification decision is based on BytecodeVerificationRemote flag
5752 // for those classes.
5753 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
5754 BytecodeVerificationLocal;
5755 }
5756 else {
5757 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
5758 stream->need_verify());
5759 }
5760 if (_cp_patches != NULL) {
5761 int len = _cp_patches->length();
5762 for (int i=0; i<len; i++) {
5763 if (has_cp_patch_at(i)) {
5764 Handle patch = cp_patch_at(i);
5765 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
5766 // We need to append the names of the patched classes to the end of the constant pool,
5767 // because a patched class may have a Utf8 name that's not already included in the
5768 // original constant pool. These class names are used when patch_constant_pool()
5769 // calls patch_class().
5770 //
5771 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
5772 // At this point, we don't know the tag for index i yet, because we haven't parsed the
5773 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
5774 _max_num_patched_klasses++;
5775 }
5776 }
5777 }
5778 }
5779
5780 // synch back verification state to stream
5781 stream->set_verify(_need_verify);
5782
5783 // Check if verification needs to be relaxed for this class file
5784 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
5785 _relax_verify = relax_format_check_for(_loader_data);
5786
5787 parse_stream(stream, CHECK);
5788
5789 post_process_parsed_stream(stream, _cp, CHECK);
5790 }
5791
5792 void ClassFileParser::clear_class_metadata() {
5793 // metadata created before the instance klass is created. Must be
5794 // deallocated if classfile parsing returns an error.
5795 _cp = NULL;
5796 _fields = NULL;
5797 _methods = NULL;
5798 _inner_classes = NULL;
5799 _nest_members = NULL;
5800 _local_interfaces = NULL;
5801 _transitive_interfaces = NULL;
5802 _combined_annotations = NULL;
5803 _annotations = _type_annotations = NULL;
5804 _fields_annotations = _fields_type_annotations = NULL;
5805 }
5806
5807 // Destructor to clean up
5808 ClassFileParser::~ClassFileParser() {
5809 if (_cp != NULL) {
5810 MetadataFactory::free_metadata(_loader_data, _cp);
5811 }
5812 if (_fields != NULL) {
5813 MetadataFactory::free_array<u2>(_loader_data, _fields);
5814 }
5815
5816 if (_methods != NULL) {
5817 // Free methods
5818 InstanceKlass::deallocate_methods(_loader_data, _methods);
5819 }
5820
5821 // beware of the Universe::empty_blah_array!!
5822 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
5823 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5824 }
5825
5826 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
5827 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5828 }
5829
5830 // Free interfaces
5831 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5832 _local_interfaces, _transitive_interfaces);
5833
5834 if (_combined_annotations != NULL) {
5835 // After all annotations arrays have been created, they are installed into the
5836 // Annotations object that will be assigned to the InstanceKlass being created.
5837
5838 // Deallocate the Annotations object and the installed annotations arrays.
5839 _combined_annotations->deallocate_contents(_loader_data);
5840
5841 // If the _combined_annotations pointer is non-NULL,
5842 // then the other annotations fields should have been cleared.
5843 assert(_annotations == NULL, "Should have been cleared");
5844 assert(_type_annotations == NULL, "Should have been cleared");
5845 assert(_fields_annotations == NULL, "Should have been cleared");
5846 assert(_fields_type_annotations == NULL, "Should have been cleared");
5847 } else {
5848 // If the annotations arrays were not installed into the Annotations object,
5849 // then they have to be deallocated explicitly.
5850 MetadataFactory::free_array<u1>(_loader_data, _annotations);
5851 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
5852 Annotations::free_contents(_loader_data, _fields_annotations);
5853 Annotations::free_contents(_loader_data, _fields_type_annotations);
5854 }
5855
5856 clear_class_metadata();
5857
5858 // deallocate the klass if already created. Don't directly deallocate, but add
5859 // to the deallocate list so that the klass is removed from the CLD::_klasses list
5860 // at a safepoint.
5861 if (_klass_to_deallocate != NULL) {
5862 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5863 }
5864 }
5865
5866 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5867 TRAPS) {
5868
5869 assert(stream != NULL, "invariant");
5870 assert(_class_name != NULL, "invariant");
5871
5872 // BEGIN STREAM PARSING
5873 stream->guarantee_more(8, CHECK); // magic, major, minor
5874 // Magic value
5875 const u4 magic = stream->get_u4_fast();
5876 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5877 "Incompatible magic value %u in class file %s",
5878 magic, CHECK);
5879
5880 // Version numbers
5881 _minor_version = stream->get_u2_fast();
5882 _major_version = stream->get_u2_fast();
5883
5884 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) {
5885 ResourceMark rm;
5886 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
5887 _major_version, _minor_version, _class_name->as_C_string());
5888 Exceptions::fthrow(
5889 THREAD_AND_LOCATION,
5890 vmSymbols::java_lang_UnsupportedClassVersionError(),
5891 "Unsupported major.minor version for dump time %u.%u",
5892 _major_version,
5893 _minor_version);
5894 }
5895
5896 // Check version numbers - we check this even with verifier off
5897 if (!is_supported_version(_major_version, _minor_version)) {
5898 ResourceMark rm(THREAD);
5899 Exceptions::fthrow(
5900 THREAD_AND_LOCATION,
5901 vmSymbols::java_lang_UnsupportedClassVersionError(),
5902 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5903 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
5904 _class_name->as_C_string(),
5905 _major_version,
5906 _minor_version,
5907 JAVA_MAX_SUPPORTED_VERSION,
5908 JAVA_MAX_SUPPORTED_MINOR_VERSION);
5909 return;
5910 }
5911
5912 stream->guarantee_more(3, CHECK); // length, first cp tag
5913 u2 cp_size = stream->get_u2_fast();
5914
5915 guarantee_property(
5916 cp_size >= 1, "Illegal constant pool size %u in class file %s",
5917 cp_size, CHECK);
5918
5919 _orig_cp_size = cp_size;
5920 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
5921 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
5922 }
5923 cp_size += _max_num_patched_klasses;
5924
5925 _cp = ConstantPool::allocate(_loader_data,
5926 cp_size,
5927 CHECK);
5928
5929 ConstantPool* const cp = _cp;
5930
5931 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5932
5933 assert(cp_size == (const u2)cp->length(), "invariant");
5934
5935 // ACCESS FLAGS
5936 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5937
5938 // Access flags
5939 jint flags;
5940 // JVM_ACC_MODULE is defined in JDK-9 and later.
5941 if (_major_version >= JAVA_9_VERSION) {
5942 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5943 } else {
5944 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5945 }
5946
5947 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5948 // Set abstract bit for old class files for backward compatibility
5949 flags |= JVM_ACC_ABSTRACT;
5950 }
5951
5952 verify_legal_class_modifiers(flags, CHECK);
5953
5954 short bad_constant = class_bad_constant_seen();
5955 if (bad_constant != 0) {
5956 // Do not throw CFE until after the access_flags are checked because if
5957 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5958 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
5959 }
5960
5961 _access_flags.set_flags(flags);
5962
5963 // This class and superclass
5964 _this_class_index = stream->get_u2_fast();
5965 check_property(
5966 valid_cp_range(_this_class_index, cp_size) &&
5967 cp->tag_at(_this_class_index).is_unresolved_klass(),
5968 "Invalid this class index %u in constant pool in class file %s",
5969 _this_class_index, CHECK);
5970
5971 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5972 assert(class_name_in_cp != NULL, "class_name can't be null");
5973
5974 // Update _class_name which could be null previously
5975 // to reflect the name in the constant pool
5976 _class_name = class_name_in_cp;
5977
5978 // Don't need to check whether this class name is legal or not.
5979 // It has been checked when constant pool is parsed.
5980 // However, make sure it is not an array type.
5981 if (_need_verify) {
5982 guarantee_property(_class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
5983 "Bad class name in class file %s",
5984 CHECK);
5985 }
5986
5987 // Checks if name in class file matches requested name
5988 if (_requested_name != NULL && _requested_name != _class_name) {
5989 ResourceMark rm(THREAD);
5990 Exceptions::fthrow(
5991 THREAD_AND_LOCATION,
5992 vmSymbols::java_lang_NoClassDefFoundError(),
5993 "%s (wrong name: %s)",
5994 _class_name->as_C_string(),
5995 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
5996 );
5997 return;
5998 }
5999
6000 // if this is an anonymous class fix up its name if it's in the unnamed
6001 // package. Otherwise, throw IAE if it is in a different package than
6002 // its host class.
6003 if (_host_klass != NULL) {
6004 fix_anonymous_class_name(CHECK);
6005 }
6006
6007 // Verification prevents us from creating names with dots in them, this
6008 // asserts that that's the case.
6009 assert(is_internal_format(_class_name), "external class name format used internally");
6010
6011 if (!is_internal()) {
6012 LogTarget(Debug, class, preorder) lt;
6013 if (lt.is_enabled()){
6014 ResourceMark rm(THREAD);
6015 LogStream ls(lt);
6016 ls.print("%s", _class_name->as_klass_external_name());
6017 if (stream->source() != NULL) {
6018 ls.print(" source: %s", stream->source());
6019 }
6020 ls.cr();
6021 }
6022
6023 #if INCLUDE_CDS
6024 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6025 if (!ClassLoader::has_jrt_entry()) {
6026 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6027 DumpLoadedClassList = NULL;
6028 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6029 _host_klass == NULL) {
6030 // Only dump the classes that can be stored into CDS archive.
6031 // Anonymous classes such as generated LambdaForm classes are also not included.
6032 oop class_loader = _loader_data->class_loader();
6033 ResourceMark rm(THREAD);
6034 bool skip = false;
6035 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6036 // For the boot and platform class loaders, skip classes that are not found in the
6037 // java runtime image, such as those found in the --patch-module entries.
6038 // These classes can't be loaded from the archive during runtime.
6039 if (!ClassLoader::is_modules_image(stream->source()) && strncmp(stream->source(), "jrt:", 4) != 0) {
6040 skip = true;
6041 }
6042
6043 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6044 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6045 // as they can be loaded from the archive during runtime.
6046 skip = false;
6047 }
6048 }
6049 if (skip) {
6050 tty->print_cr("skip writing class %s from source %s to classlist file",
6051 _class_name->as_C_string(), stream->source());
6052 } else {
6053 classlist_file->print_cr("%s", _class_name->as_C_string());
6054 classlist_file->flush();
6055 }
6056 }
6057 }
6058 #endif
6059 }
6060
6061 // SUPERKLASS
6062 _super_class_index = stream->get_u2_fast();
6063 _super_klass = parse_super_class(cp,
6064 _super_class_index,
6065 _need_verify,
6066 CHECK);
6067
6068 // Interfaces
6069 _itfs_len = stream->get_u2_fast();
6070 parse_interfaces(stream,
6071 _itfs_len,
6072 cp,
6073 &_has_nonstatic_concrete_methods,
6074 CHECK);
6075
6076 assert(_local_interfaces != NULL, "invariant");
6077
6078 // Fields (offsets are filled in later)
6079 _fac = new FieldAllocationCount();
6080 parse_fields(stream,
6081 _access_flags.is_interface(),
6082 _fac,
6083 cp,
6084 cp_size,
6085 &_java_fields_count,
6086 CHECK);
6087
6088 assert(_fields != NULL, "invariant");
6089
6090 // Methods
6091 AccessFlags promoted_flags;
6092 parse_methods(stream,
6093 _access_flags.is_interface(),
6094 &promoted_flags,
6095 &_has_final_method,
6096 &_declares_nonstatic_concrete_methods,
6097 CHECK);
6098
6099 assert(_methods != NULL, "invariant");
6100
6101 // promote flags from parse_methods() to the klass' flags
6102 _access_flags.add_promoted_flags(promoted_flags.as_int());
6103
6104 if (_declares_nonstatic_concrete_methods) {
6105 _has_nonstatic_concrete_methods = true;
6106 }
6107
6108 // Additional attributes/annotations
6109 _parsed_annotations = new ClassAnnotationCollector();
6110 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6111
6112 assert(_inner_classes != NULL, "invariant");
6113
6114 // Finalize the Annotations metadata object,
6115 // now that all annotation arrays have been created.
6116 create_combined_annotations(CHECK);
6117
6118 // Make sure this is the end of class file stream
6119 guarantee_property(stream->at_eos(),
6120 "Extra bytes at the end of class file %s",
6121 CHECK);
6122
6123 // all bytes in stream read and parsed
6124 }
6125
6126 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6127 ConstantPool* cp,
6128 TRAPS) {
6129 assert(stream != NULL, "invariant");
6130 assert(stream->at_eos(), "invariant");
6131 assert(cp != NULL, "invariant");
6132 assert(_loader_data != NULL, "invariant");
6133
6134 if (_class_name == vmSymbols::java_lang_Object()) {
6135 check_property(_local_interfaces == Universe::the_empty_klass_array(),
6136 "java.lang.Object cannot implement an interface in class file %s",
6137 CHECK);
6138 }
6139 // We check super class after class file is parsed and format is checked
6140 if (_super_class_index > 0 && NULL ==_super_klass) {
6141 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6142 if (_access_flags.is_interface()) {
6143 // Before attempting to resolve the superclass, check for class format
6144 // errors not checked yet.
6145 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6146 "Interfaces must have java.lang.Object as superclass in class file %s",
6147 CHECK);
6148 }
6149 Handle loader(THREAD, _loader_data->class_loader());
6150 _super_klass = (const InstanceKlass*)
6151 SystemDictionary::resolve_super_or_fail(_class_name,
6152 super_class_name,
6153 loader,
6154 _protection_domain,
6155 true,
6156 CHECK);
6157 }
6158
6159 if (_super_klass != NULL) {
6160 if (_super_klass->has_nonstatic_concrete_methods()) {
6161 _has_nonstatic_concrete_methods = true;
6162 }
6163
6164 if (_super_klass->is_interface()) {
6165 ResourceMark rm(THREAD);
6166 Exceptions::fthrow(
6167 THREAD_AND_LOCATION,
6168 vmSymbols::java_lang_IncompatibleClassChangeError(),
6169 "class %s has interface %s as super class",
6170 _class_name->as_klass_external_name(),
6171 _super_klass->external_name()
6172 );
6173 return;
6174 }
6175 // Make sure super class is not final
6176 if (_super_klass->is_final()) {
6177 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6178 }
6179 }
6180
6181 // Compute the transitive list of all unique interfaces implemented by this class
6182 _transitive_interfaces =
6183 compute_transitive_interfaces(_super_klass,
6184 _local_interfaces,
6185 _loader_data,
6186 CHECK);
6187
6188 assert(_transitive_interfaces != NULL, "invariant");
6189
6190 // sort methods
6191 _method_ordering = sort_methods(_methods);
6192
6193 _all_mirandas = new GrowableArray<Method*>(20);
6194
6195 Handle loader(THREAD, _loader_data->class_loader());
6196 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6197 &_num_miranda_methods,
6198 _all_mirandas,
6199 _super_klass,
6200 _methods,
6201 _access_flags,
6202 _major_version,
6203 loader,
6204 _class_name,
6205 _local_interfaces,
6206 CHECK);
6207
6208 // Size of Java itable (in words)
6209 _itable_size = _access_flags.is_interface() ? 0 :
6210 klassItable::compute_itable_size(_transitive_interfaces);
6211
6212 assert(_fac != NULL, "invariant");
6213 assert(_parsed_annotations != NULL, "invariant");
6214
6215 _field_info = new FieldLayoutInfo();
6216 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6217
6218 // Compute reference typ
6219 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6220
6221 }
6222
6223 void ClassFileParser::set_klass(InstanceKlass* klass) {
6224
6225 #ifdef ASSERT
6226 if (klass != NULL) {
6227 assert(NULL == _klass, "leaking?");
6228 }
6229 #endif
6230
6231 _klass = klass;
6232 }
6233
6234 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6235
6236 #ifdef ASSERT
6237 if (klass != NULL) {
6238 assert(NULL == _klass_to_deallocate, "leaking?");
6239 }
6240 #endif
6241
6242 _klass_to_deallocate = klass;
6243 }
6244
6245 // Caller responsible for ResourceMark
6246 // clone stream with rewound position
6247 const ClassFileStream* ClassFileParser::clone_stream() const {
6248 assert(_stream != NULL, "invariant");
6249
6250 return _stream->clone();
6251 }
6252 // ----------------------------------------------------------------------------
6253 // debugging
6254
6255 #ifdef ASSERT
6256
6257 // return true if class_name contains no '.' (internal format is '/')
6258 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6259 if (class_name != NULL) {
6260 ResourceMark rm;
6261 char* name = class_name->as_C_string();
6262 return strchr(name, '.') == NULL;
6263 } else {
6264 return true;
6265 }
6266 }
6267
6268 #endif