1 /*
2 * Copyright (c) 1997, 2019, 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/packageEntry.hpp"
36 #include "classfile/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/verificationType.hpp"
39 #include "classfile/verifier.hpp"
40 #include "classfile/vmSymbols.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.hpp"
48 #include "oops/annotations.hpp"
49 #include "oops/constantPool.inline.hpp"
50 #include "oops/fieldStreams.hpp"
51 #include "oops/instanceKlass.hpp"
52 #include "oops/instanceMirrorKlass.hpp"
53 #include "oops/klass.inline.hpp"
54 #include "oops/klassVtable.hpp"
55 #include "oops/metadata.hpp"
56 #include "oops/method.inline.hpp"
57 #include "oops/oop.inline.hpp"
58 #include "oops/symbol.hpp"
59 #include "prims/jvmtiExport.hpp"
60 #include "prims/jvmtiThreadState.hpp"
61 #include "runtime/arguments.hpp"
62 #include "runtime/handles.inline.hpp"
63 #include "runtime/javaCalls.hpp"
64 #include "runtime/os.hpp"
65 #include "runtime/perfData.hpp"
66 #include "runtime/reflection.hpp"
67 #include "runtime/safepointVerifiers.hpp"
68 #include "runtime/signature.hpp"
69 #include "runtime/timer.hpp"
70 #include "services/classLoadingService.hpp"
71 #include "services/threadService.hpp"
72 #include "utilities/align.hpp"
73 #include "utilities/bitMap.inline.hpp"
74 #include "utilities/copy.hpp"
75 #include "utilities/exceptions.hpp"
76 #include "utilities/globalDefinitions.hpp"
77 #include "utilities/growableArray.hpp"
78 #include "utilities/macros.hpp"
79 #include "utilities/ostream.hpp"
80 #include "utilities/resourceHash.hpp"
81 #include "utilities/utf8.hpp"
82
83 #if INCLUDE_CDS
84 #include "classfile/systemDictionaryShared.hpp"
85 #endif
86 #if INCLUDE_JFR
87 #include "jfr/support/jfrTraceIdExtension.hpp"
88 #endif
89
90 // We generally try to create the oops directly when parsing, rather than
91 // allocating temporary data structures and copying the bytes twice. A
92 // temporary area is only needed when parsing utf8 entries in the constant
93 // pool and when parsing line number tables.
94
95 // We add assert in debug mode when class format is not checked.
96
97 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
98 #define JAVA_MIN_SUPPORTED_VERSION 45
99 #define JAVA_PREVIEW_MINOR_VERSION 65535
100
101 // Used for two backward compatibility reasons:
102 // - to check for new additions to the class file format in JDK1.5
103 // - to check for bug fixes in the format checker in JDK1.5
104 #define JAVA_1_5_VERSION 49
105
106 // Used for backward compatibility reasons:
107 // - to check for javac bug fixes that happened after 1.5
108 // - also used as the max version when running in jdk6
109 #define JAVA_6_VERSION 50
110
111 // Used for backward compatibility reasons:
112 // - to disallow argument and require ACC_STATIC for <clinit> methods
113 #define JAVA_7_VERSION 51
114
115 // Extension method support.
116 #define JAVA_8_VERSION 52
117
118 #define JAVA_9_VERSION 53
119
120 #define JAVA_10_VERSION 54
121
122 #define JAVA_11_VERSION 55
123
124 #define JAVA_12_VERSION 56
125
126 #define JAVA_13_VERSION 57
127
set_class_bad_constant_seen(short bad_constant)128 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
129 assert((bad_constant == JVM_CONSTANT_Module ||
130 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
131 "Unexpected bad constant pool entry");
132 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
133 }
134
parse_constant_pool_entries(const ClassFileStream * const stream,ConstantPool * cp,const int length,TRAPS)135 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
136 ConstantPool* cp,
137 const int length,
138 TRAPS) {
139 assert(stream != NULL, "invariant");
140 assert(cp != NULL, "invariant");
141
142 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
143 // this function (_current can be allocated in a register, with scalar
144 // replacement of aggregates). The _current pointer is copied back to
145 // stream() when this function returns. DON'T call another method within
146 // this method that uses stream().
147 const ClassFileStream cfs1 = *stream;
148 const ClassFileStream* const cfs = &cfs1;
149
150 assert(cfs->allocated_on_stack(), "should be local");
151 debug_only(const u1* const old_current = stream->current();)
152
153 // Used for batching symbol allocations.
154 const char* names[SymbolTable::symbol_alloc_batch_size];
155 int lengths[SymbolTable::symbol_alloc_batch_size];
156 int indices[SymbolTable::symbol_alloc_batch_size];
157 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
158 int names_count = 0;
159
160 // parsing Index 0 is unused
161 for (int index = 1; index < length; index++) {
162 // Each of the following case guarantees one more byte in the stream
163 // for the following tag or the access_flags following constant pool,
164 // so we don't need bounds-check for reading tag.
165 const u1 tag = cfs->get_u1_fast();
166 switch (tag) {
167 case JVM_CONSTANT_Class : {
168 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
169 const u2 name_index = cfs->get_u2_fast();
170 cp->klass_index_at_put(index, name_index);
171 break;
172 }
173 case JVM_CONSTANT_Fieldref: {
174 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
175 const u2 class_index = cfs->get_u2_fast();
176 const u2 name_and_type_index = cfs->get_u2_fast();
177 cp->field_at_put(index, class_index, name_and_type_index);
178 break;
179 }
180 case JVM_CONSTANT_Methodref: {
181 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
182 const u2 class_index = cfs->get_u2_fast();
183 const u2 name_and_type_index = cfs->get_u2_fast();
184 cp->method_at_put(index, class_index, name_and_type_index);
185 break;
186 }
187 case JVM_CONSTANT_InterfaceMethodref: {
188 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
189 const u2 class_index = cfs->get_u2_fast();
190 const u2 name_and_type_index = cfs->get_u2_fast();
191 cp->interface_method_at_put(index, class_index, name_and_type_index);
192 break;
193 }
194 case JVM_CONSTANT_String : {
195 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
196 const u2 string_index = cfs->get_u2_fast();
197 cp->string_index_at_put(index, string_index);
198 break;
199 }
200 case JVM_CONSTANT_MethodHandle :
201 case JVM_CONSTANT_MethodType: {
202 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
203 classfile_parse_error(
204 "Class file version does not support constant tag %u in class file %s",
205 tag, CHECK);
206 }
207 if (tag == JVM_CONSTANT_MethodHandle) {
208 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
209 const u1 ref_kind = cfs->get_u1_fast();
210 const u2 method_index = cfs->get_u2_fast();
211 cp->method_handle_index_at_put(index, ref_kind, method_index);
212 }
213 else if (tag == JVM_CONSTANT_MethodType) {
214 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
215 const u2 signature_index = cfs->get_u2_fast();
216 cp->method_type_index_at_put(index, signature_index);
217 }
218 else {
219 ShouldNotReachHere();
220 }
221 break;
222 }
223 case JVM_CONSTANT_Dynamic : {
224 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
225 classfile_parse_error(
226 "Class file version does not support constant tag %u in class file %s",
227 tag, CHECK);
228 }
229 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
230 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
231 const u2 name_and_type_index = cfs->get_u2_fast();
232 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
233 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
234 }
235 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
236 break;
237 }
238 case JVM_CONSTANT_InvokeDynamic : {
239 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
240 classfile_parse_error(
241 "Class file version does not support constant tag %u in class file %s",
242 tag, CHECK);
243 }
244 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
245 const u2 bootstrap_specifier_index = cfs->get_u2_fast();
246 const u2 name_and_type_index = cfs->get_u2_fast();
247 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
248 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
249 }
250 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
251 break;
252 }
253 case JVM_CONSTANT_Integer: {
254 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
255 const u4 bytes = cfs->get_u4_fast();
256 cp->int_at_put(index, (jint)bytes);
257 break;
258 }
259 case JVM_CONSTANT_Float: {
260 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
261 const u4 bytes = cfs->get_u4_fast();
262 cp->float_at_put(index, *(jfloat*)&bytes);
263 break;
264 }
265 case JVM_CONSTANT_Long: {
266 // A mangled type might cause you to overrun allocated memory
267 guarantee_property(index + 1 < length,
268 "Invalid constant pool entry %u in class file %s",
269 index,
270 CHECK);
271 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
272 const u8 bytes = cfs->get_u8_fast();
273 cp->long_at_put(index, bytes);
274 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
275 break;
276 }
277 case JVM_CONSTANT_Double: {
278 // A mangled type might cause you to overrun allocated memory
279 guarantee_property(index+1 < length,
280 "Invalid constant pool entry %u in class file %s",
281 index,
282 CHECK);
283 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
284 const u8 bytes = cfs->get_u8_fast();
285 cp->double_at_put(index, *(jdouble*)&bytes);
286 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
287 break;
288 }
289 case JVM_CONSTANT_NameAndType: {
290 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
291 const u2 name_index = cfs->get_u2_fast();
292 const u2 signature_index = cfs->get_u2_fast();
293 cp->name_and_type_at_put(index, name_index, signature_index);
294 break;
295 }
296 case JVM_CONSTANT_Utf8 : {
297 cfs->guarantee_more(2, CHECK); // utf8_length
298 u2 utf8_length = cfs->get_u2_fast();
299 const u1* utf8_buffer = cfs->current();
300 assert(utf8_buffer != NULL, "null utf8 buffer");
301 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
302 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
303 cfs->skip_u1_fast(utf8_length);
304
305 // Before storing the symbol, make sure it's legal
306 if (_need_verify) {
307 verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
308 }
309
310 if (has_cp_patch_at(index)) {
311 Handle patch = clear_cp_patch_at(index);
312 guarantee_property(java_lang_String::is_instance(patch()),
313 "Illegal utf8 patch at %d in class file %s",
314 index,
315 CHECK);
316 const char* const str = java_lang_String::as_utf8_string(patch());
317 // (could use java_lang_String::as_symbol instead, but might as well batch them)
318 utf8_buffer = (const u1*) str;
319 utf8_length = (u2) strlen(str);
320 }
321
322 unsigned int hash;
323 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
324 utf8_length,
325 hash);
326 if (result == NULL) {
327 names[names_count] = (const char*)utf8_buffer;
328 lengths[names_count] = utf8_length;
329 indices[names_count] = index;
330 hashValues[names_count++] = hash;
331 if (names_count == SymbolTable::symbol_alloc_batch_size) {
332 SymbolTable::new_symbols(_loader_data,
333 cp,
334 names_count,
335 names,
336 lengths,
337 indices,
338 hashValues);
339 names_count = 0;
340 }
341 } else {
342 cp->symbol_at_put(index, result);
343 }
344 break;
345 }
346 case JVM_CONSTANT_Module:
347 case JVM_CONSTANT_Package: {
348 // Record that an error occurred in these two cases but keep parsing so
349 // that ACC_Module can be checked for in the access_flags. Need to
350 // throw NoClassDefFoundError in that case.
351 if (_major_version >= JAVA_9_VERSION) {
352 cfs->guarantee_more(3, CHECK);
353 cfs->get_u2_fast();
354 set_class_bad_constant_seen(tag);
355 break;
356 }
357 }
358 default: {
359 classfile_parse_error("Unknown constant tag %u in class file %s",
360 tag,
361 CHECK);
362 break;
363 }
364 } // end of switch(tag)
365 } // end of for
366
367 // Allocate the remaining symbols
368 if (names_count > 0) {
369 SymbolTable::new_symbols(_loader_data,
370 cp,
371 names_count,
372 names,
373 lengths,
374 indices,
375 hashValues);
376 }
377
378 // Copy _current pointer of local copy back to stream.
379 assert(stream->current() == old_current, "non-exclusive use of stream");
380 stream->set_current(cfs1.current());
381
382 }
383
valid_cp_range(int index,int length)384 static inline bool valid_cp_range(int index, int length) {
385 return (index > 0 && index < length);
386 }
387
check_symbol_at(const ConstantPool * cp,int index)388 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
389 assert(cp != NULL, "invariant");
390 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
391 return cp->symbol_at(index);
392 }
393 return NULL;
394 }
395
396 #ifdef ASSERT
397 PRAGMA_DIAG_PUSH
398 PRAGMA_FORMAT_NONLITERAL_IGNORED
report_assert_property_failure(const char * msg,TRAPS) const399 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
400 ResourceMark rm(THREAD);
401 fatal(msg, _class_name->as_C_string());
402 }
403
report_assert_property_failure(const char * msg,int index,TRAPS) const404 void ClassFileParser::report_assert_property_failure(const char* msg,
405 int index,
406 TRAPS) const {
407 ResourceMark rm(THREAD);
408 fatal(msg, index, _class_name->as_C_string());
409 }
410 PRAGMA_DIAG_POP
411 #endif
412
parse_constant_pool(const ClassFileStream * const stream,ConstantPool * const cp,const int length,TRAPS)413 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
414 ConstantPool* const cp,
415 const int length,
416 TRAPS) {
417 assert(cp != NULL, "invariant");
418 assert(stream != NULL, "invariant");
419
420 // parsing constant pool entries
421 parse_constant_pool_entries(stream, cp, length, CHECK);
422 if (class_bad_constant_seen() != 0) {
423 // a bad CP entry has been detected previously so stop parsing and just return.
424 return;
425 }
426
427 int index = 1; // declared outside of loops for portability
428 int num_klasses = 0;
429
430 // first verification pass - validate cross references
431 // and fixup class and string constants
432 for (index = 1; index < length; index++) { // Index 0 is unused
433 const jbyte tag = cp->tag_at(index).value();
434 switch (tag) {
435 case JVM_CONSTANT_Class: {
436 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
437 break;
438 }
439 case JVM_CONSTANT_Fieldref:
440 // fall through
441 case JVM_CONSTANT_Methodref:
442 // fall through
443 case JVM_CONSTANT_InterfaceMethodref: {
444 if (!_need_verify) break;
445 const int klass_ref_index = cp->klass_ref_index_at(index);
446 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
447 check_property(valid_klass_reference_at(klass_ref_index),
448 "Invalid constant pool index %u in class file %s",
449 klass_ref_index, CHECK);
450 check_property(valid_cp_range(name_and_type_ref_index, length) &&
451 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
452 "Invalid constant pool index %u in class file %s",
453 name_and_type_ref_index, CHECK);
454 break;
455 }
456 case JVM_CONSTANT_String: {
457 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
458 break;
459 }
460 case JVM_CONSTANT_Integer:
461 break;
462 case JVM_CONSTANT_Float:
463 break;
464 case JVM_CONSTANT_Long:
465 case JVM_CONSTANT_Double: {
466 index++;
467 check_property(
468 (index < length && cp->tag_at(index).is_invalid()),
469 "Improper constant pool long/double index %u in class file %s",
470 index, CHECK);
471 break;
472 }
473 case JVM_CONSTANT_NameAndType: {
474 if (!_need_verify) break;
475 const int name_ref_index = cp->name_ref_index_at(index);
476 const int signature_ref_index = cp->signature_ref_index_at(index);
477 check_property(valid_symbol_at(name_ref_index),
478 "Invalid constant pool index %u in class file %s",
479 name_ref_index, CHECK);
480 check_property(valid_symbol_at(signature_ref_index),
481 "Invalid constant pool index %u in class file %s",
482 signature_ref_index, CHECK);
483 break;
484 }
485 case JVM_CONSTANT_Utf8:
486 break;
487 case JVM_CONSTANT_UnresolvedClass: // fall-through
488 case JVM_CONSTANT_UnresolvedClassInError: {
489 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
490 break;
491 }
492 case JVM_CONSTANT_ClassIndex: {
493 const int class_index = cp->klass_index_at(index);
494 check_property(valid_symbol_at(class_index),
495 "Invalid constant pool index %u in class file %s",
496 class_index, CHECK);
497 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
498 break;
499 }
500 case JVM_CONSTANT_StringIndex: {
501 const int string_index = cp->string_index_at(index);
502 check_property(valid_symbol_at(string_index),
503 "Invalid constant pool index %u in class file %s",
504 string_index, CHECK);
505 Symbol* const sym = cp->symbol_at(string_index);
506 cp->unresolved_string_at_put(index, sym);
507 break;
508 }
509 case JVM_CONSTANT_MethodHandle: {
510 const int ref_index = cp->method_handle_index_at(index);
511 check_property(valid_cp_range(ref_index, length),
512 "Invalid constant pool index %u in class file %s",
513 ref_index, CHECK);
514 const constantTag tag = cp->tag_at(ref_index);
515 const int ref_kind = cp->method_handle_ref_kind_at(index);
516
517 switch (ref_kind) {
518 case JVM_REF_getField:
519 case JVM_REF_getStatic:
520 case JVM_REF_putField:
521 case JVM_REF_putStatic: {
522 check_property(
523 tag.is_field(),
524 "Invalid constant pool index %u in class file %s (not a field)",
525 ref_index, CHECK);
526 break;
527 }
528 case JVM_REF_invokeVirtual:
529 case JVM_REF_newInvokeSpecial: {
530 check_property(
531 tag.is_method(),
532 "Invalid constant pool index %u in class file %s (not a method)",
533 ref_index, CHECK);
534 break;
535 }
536 case JVM_REF_invokeStatic:
537 case JVM_REF_invokeSpecial: {
538 check_property(
539 tag.is_method() ||
540 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
541 "Invalid constant pool index %u in class file %s (not a method)",
542 ref_index, CHECK);
543 break;
544 }
545 case JVM_REF_invokeInterface: {
546 check_property(
547 tag.is_interface_method(),
548 "Invalid constant pool index %u in class file %s (not an interface method)",
549 ref_index, CHECK);
550 break;
551 }
552 default: {
553 classfile_parse_error(
554 "Bad method handle kind at constant pool index %u in class file %s",
555 index, CHECK);
556 }
557 } // switch(refkind)
558 // Keep the ref_index unchanged. It will be indirected at link-time.
559 break;
560 } // case MethodHandle
561 case JVM_CONSTANT_MethodType: {
562 const int ref_index = cp->method_type_index_at(index);
563 check_property(valid_symbol_at(ref_index),
564 "Invalid constant pool index %u in class file %s",
565 ref_index, CHECK);
566 break;
567 }
568 case JVM_CONSTANT_Dynamic: {
569 const int name_and_type_ref_index =
570 cp->bootstrap_name_and_type_ref_index_at(index);
571
572 check_property(valid_cp_range(name_and_type_ref_index, length) &&
573 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
574 "Invalid constant pool index %u in class file %s",
575 name_and_type_ref_index, CHECK);
576 // bootstrap specifier index must be checked later,
577 // when BootstrapMethods attr is available
578
579 // Mark the constant pool as having a CONSTANT_Dynamic_info structure
580 cp->set_has_dynamic_constant();
581 break;
582 }
583 case JVM_CONSTANT_InvokeDynamic: {
584 const int name_and_type_ref_index =
585 cp->bootstrap_name_and_type_ref_index_at(index);
586
587 check_property(valid_cp_range(name_and_type_ref_index, length) &&
588 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
589 "Invalid constant pool index %u in class file %s",
590 name_and_type_ref_index, CHECK);
591 // bootstrap specifier index must be checked later,
592 // when BootstrapMethods attr is available
593 break;
594 }
595 default: {
596 fatal("bad constant pool tag value %u", cp->tag_at(index).value());
597 ShouldNotReachHere();
598 break;
599 }
600 } // switch(tag)
601 } // end of for
602
603 _first_patched_klass_resolved_index = num_klasses;
604 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
605
606 if (_cp_patches != NULL) {
607 // need to treat this_class specially...
608
609 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
610 // for now. These will be replaced with actual names of the patched classes in patch_class().
611 Symbol* s = vmSymbols::star_name();
612 for (int n=_orig_cp_size; n<cp->length(); n++) {
613 cp->symbol_at_put(n, s);
614 }
615
616 int this_class_index;
617 {
618 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
619 const u1* const mark = stream->current();
620 stream->skip_u2_fast(1); // skip flags
621 this_class_index = stream->get_u2_fast();
622 stream->set_current(mark); // revert to mark
623 }
624
625 for (index = 1; index < length; index++) { // Index 0 is unused
626 if (has_cp_patch_at(index)) {
627 guarantee_property(index != this_class_index,
628 "Illegal constant pool patch to self at %d in class file %s",
629 index, CHECK);
630 patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
631 }
632 }
633 }
634
635 if (!_need_verify) {
636 return;
637 }
638
639 // second verification pass - checks the strings are of the right format.
640 // but not yet to the other entries
641 for (index = 1; index < length; index++) {
642 const jbyte tag = cp->tag_at(index).value();
643 switch (tag) {
644 case JVM_CONSTANT_UnresolvedClass: {
645 const Symbol* const class_name = cp->klass_name_at(index);
646 // check the name, even if _cp_patches will overwrite it
647 verify_legal_class_name(class_name, CHECK);
648 break;
649 }
650 case JVM_CONSTANT_NameAndType: {
651 if (_need_verify) {
652 const int sig_index = cp->signature_ref_index_at(index);
653 const int name_index = cp->name_ref_index_at(index);
654 const Symbol* const name = cp->symbol_at(name_index);
655 const Symbol* const sig = cp->symbol_at(sig_index);
656 guarantee_property(sig->utf8_length() != 0,
657 "Illegal zero length constant pool entry at %d in class %s",
658 sig_index, CHECK);
659 guarantee_property(name->utf8_length() != 0,
660 "Illegal zero length constant pool entry at %d in class %s",
661 name_index, CHECK);
662
663 if (sig->char_at(0) == JVM_SIGNATURE_FUNC) {
664 // Format check method name and signature
665 verify_legal_method_name(name, CHECK);
666 verify_legal_method_signature(name, sig, CHECK);
667 } else {
668 // Format check field name and signature
669 verify_legal_field_name(name, CHECK);
670 verify_legal_field_signature(name, sig, CHECK);
671 }
672 }
673 break;
674 }
675 case JVM_CONSTANT_Dynamic: {
676 const int name_and_type_ref_index =
677 cp->name_and_type_ref_index_at(index);
678 // already verified to be utf8
679 const int name_ref_index =
680 cp->name_ref_index_at(name_and_type_ref_index);
681 // already verified to be utf8
682 const int signature_ref_index =
683 cp->signature_ref_index_at(name_and_type_ref_index);
684 const Symbol* const name = cp->symbol_at(name_ref_index);
685 const Symbol* const signature = cp->symbol_at(signature_ref_index);
686 if (_need_verify) {
687 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
688 // Need only to be sure signature is non-zero length and the right type.
689 if (signature->utf8_length() == 0 ||
690 signature->char_at(0) == JVM_SIGNATURE_FUNC) {
691 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
692 }
693 }
694 break;
695 }
696 case JVM_CONSTANT_InvokeDynamic:
697 case JVM_CONSTANT_Fieldref:
698 case JVM_CONSTANT_Methodref:
699 case JVM_CONSTANT_InterfaceMethodref: {
700 const int name_and_type_ref_index =
701 cp->name_and_type_ref_index_at(index);
702 // already verified to be utf8
703 const int name_ref_index =
704 cp->name_ref_index_at(name_and_type_ref_index);
705 // already verified to be utf8
706 const int signature_ref_index =
707 cp->signature_ref_index_at(name_and_type_ref_index);
708 const Symbol* const name = cp->symbol_at(name_ref_index);
709 const Symbol* const signature = cp->symbol_at(signature_ref_index);
710 if (tag == JVM_CONSTANT_Fieldref) {
711 if (_need_verify) {
712 // Field name and signature are verified above, when iterating NameAndType_info.
713 // Need only to be sure signature is non-zero length and the right type.
714 if (signature->utf8_length() == 0 ||
715 signature->char_at(0) == JVM_SIGNATURE_FUNC) {
716 throwIllegalSignature("Field", name, signature, CHECK);
717 }
718 }
719 } else {
720 if (_need_verify) {
721 // Method name and signature are verified above, when iterating NameAndType_info.
722 // Need only to be sure signature is non-zero length and the right type.
723 if (signature->utf8_length() == 0 ||
724 signature->char_at(0) != JVM_SIGNATURE_FUNC) {
725 throwIllegalSignature("Method", name, signature, CHECK);
726 }
727 }
728 // 4509014: If a class method name begins with '<', it must be "<init>"
729 const unsigned int name_len = name->utf8_length();
730 if (tag == JVM_CONSTANT_Methodref &&
731 name_len != 0 &&
732 name->char_at(0) == '<' &&
733 name != vmSymbols::object_initializer_name()) {
734 classfile_parse_error(
735 "Bad method name at constant pool index %u in class file %s",
736 name_ref_index, CHECK);
737 }
738 }
739 break;
740 }
741 case JVM_CONSTANT_MethodHandle: {
742 const int ref_index = cp->method_handle_index_at(index);
743 const int ref_kind = cp->method_handle_ref_kind_at(index);
744 switch (ref_kind) {
745 case JVM_REF_invokeVirtual:
746 case JVM_REF_invokeStatic:
747 case JVM_REF_invokeSpecial:
748 case JVM_REF_newInvokeSpecial: {
749 const int name_and_type_ref_index =
750 cp->name_and_type_ref_index_at(ref_index);
751 const int name_ref_index =
752 cp->name_ref_index_at(name_and_type_ref_index);
753 const Symbol* const name = cp->symbol_at(name_ref_index);
754 if (ref_kind == JVM_REF_newInvokeSpecial) {
755 if (name != vmSymbols::object_initializer_name()) {
756 classfile_parse_error(
757 "Bad constructor name at constant pool index %u in class file %s",
758 name_ref_index, CHECK);
759 }
760 } else {
761 if (name == vmSymbols::object_initializer_name()) {
762 classfile_parse_error(
763 "Bad method name at constant pool index %u in class file %s",
764 name_ref_index, CHECK);
765 }
766 }
767 break;
768 }
769 // Other ref_kinds are already fully checked in previous pass.
770 } // switch(ref_kind)
771 break;
772 }
773 case JVM_CONSTANT_MethodType: {
774 const Symbol* const no_name = vmSymbols::type_name(); // place holder
775 const Symbol* const signature = cp->method_type_signature_at(index);
776 verify_legal_method_signature(no_name, signature, CHECK);
777 break;
778 }
779 case JVM_CONSTANT_Utf8: {
780 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
781 }
782 } // switch(tag)
783 } // end of for
784 }
785
clear_cp_patch_at(int index)786 Handle ClassFileParser::clear_cp_patch_at(int index) {
787 Handle patch = cp_patch_at(index);
788 _cp_patches->at_put(index, Handle());
789 assert(!has_cp_patch_at(index), "");
790 return patch;
791 }
792
patch_class(ConstantPool * cp,int class_index,Klass * k,Symbol * name)793 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
794 int name_index = _orig_cp_size + _num_patched_klasses;
795 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
796
797 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
798 _num_patched_klasses ++;
799 }
800
patch_constant_pool(ConstantPool * cp,int index,Handle patch,TRAPS)801 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
802 int index,
803 Handle patch,
804 TRAPS) {
805 assert(cp != NULL, "invariant");
806
807 BasicType patch_type = T_VOID;
808
809 switch (cp->tag_at(index).value()) {
810
811 case JVM_CONSTANT_UnresolvedClass: {
812 // Patching a class means pre-resolving it.
813 // The name in the constant pool is ignored.
814 if (java_lang_Class::is_instance(patch())) {
815 guarantee_property(!java_lang_Class::is_primitive(patch()),
816 "Illegal class patch at %d in class file %s",
817 index, CHECK);
818 Klass* k = java_lang_Class::as_Klass(patch());
819 patch_class(cp, index, k, k->name());
820 } else {
821 guarantee_property(java_lang_String::is_instance(patch()),
822 "Illegal class patch at %d in class file %s",
823 index, CHECK);
824 Symbol* const name = java_lang_String::as_symbol(patch());
825 patch_class(cp, index, NULL, name);
826 }
827 break;
828 }
829
830 case JVM_CONSTANT_String: {
831 // skip this patch and don't clear it. Needs the oop array for resolved
832 // references to be created first.
833 return;
834 }
835 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
836 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
837 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
838 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
839 patch_prim:
840 {
841 jvalue value;
842 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
843 guarantee_property(value_type == patch_type,
844 "Illegal primitive patch at %d in class file %s",
845 index, CHECK);
846 switch (value_type) {
847 case T_INT: cp->int_at_put(index, value.i); break;
848 case T_FLOAT: cp->float_at_put(index, value.f); break;
849 case T_LONG: cp->long_at_put(index, value.j); break;
850 case T_DOUBLE: cp->double_at_put(index, value.d); break;
851 default: assert(false, "");
852 }
853 } // end patch_prim label
854 break;
855
856 default: {
857 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
858 guarantee_property(!has_cp_patch_at(index),
859 "Illegal unexpected patch at %d in class file %s",
860 index, CHECK);
861 return;
862 }
863 } // end of switch(tag)
864
865 // On fall-through, mark the patch as used.
866 clear_cp_patch_at(index);
867 }
868 class NameSigHash: public ResourceObj {
869 public:
870 const Symbol* _name; // name
871 const Symbol* _sig; // signature
872 NameSigHash* _next; // Next entry in hash table
873 };
874
875 static const int HASH_ROW_SIZE = 256;
876
hash(const Symbol * name,const Symbol * sig)877 static unsigned int hash(const Symbol* name, const Symbol* sig) {
878 unsigned int raw_hash = 0;
879 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
880 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
881
882 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
883 }
884
885
initialize_hashtable(NameSigHash ** table)886 static void initialize_hashtable(NameSigHash** table) {
887 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
888 }
889 // Return false if the name/sig combination is found in table.
890 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
891 // The old format checker uses heap sort to find duplicates.
892 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
893 // of table since we don't expect Symbol*'s to move.
put_after_lookup(const Symbol * name,const Symbol * sig,NameSigHash ** table)894 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
895 assert(name != NULL, "name in constant pool is NULL");
896
897 // First lookup for duplicates
898 int index = hash(name, sig);
899 NameSigHash* entry = table[index];
900 while (entry != NULL) {
901 if (entry->_name == name && entry->_sig == sig) {
902 return false;
903 }
904 entry = entry->_next;
905 }
906
907 // No duplicate is found, allocate a new entry and fill it.
908 entry = new NameSigHash();
909 entry->_name = name;
910 entry->_sig = sig;
911
912 // Insert into hash table
913 entry->_next = table[index];
914 table[index] = entry;
915
916 return true;
917 }
918
919 // Side-effects: populates the _local_interfaces field
parse_interfaces(const ClassFileStream * const stream,const int itfs_len,ConstantPool * const cp,bool * const has_nonstatic_concrete_methods,TRAPS)920 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
921 const int itfs_len,
922 ConstantPool* const cp,
923 bool* const has_nonstatic_concrete_methods,
924 TRAPS) {
925 assert(stream != NULL, "invariant");
926 assert(cp != NULL, "invariant");
927 assert(has_nonstatic_concrete_methods != NULL, "invariant");
928
929 if (itfs_len == 0) {
930 _local_interfaces = Universe::the_empty_instance_klass_array();
931 } else {
932 assert(itfs_len > 0, "only called for len>0");
933 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
934
935 int index;
936 for (index = 0; index < itfs_len; index++) {
937 const u2 interface_index = stream->get_u2(CHECK);
938 Klass* interf;
939 check_property(
940 valid_klass_reference_at(interface_index),
941 "Interface name has bad constant pool index %u in class file %s",
942 interface_index, CHECK);
943 if (cp->tag_at(interface_index).is_klass()) {
944 interf = cp->resolved_klass_at(interface_index);
945 } else {
946 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
947
948 // Don't need to check legal name because it's checked when parsing constant pool.
949 // But need to make sure it's not an array type.
950 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
951 "Bad interface name in class file %s", CHECK);
952
953 // Call resolve_super so classcircularity is checked
954 interf = SystemDictionary::resolve_super_or_fail(
955 _class_name,
956 unresolved_klass,
957 Handle(THREAD, _loader_data->class_loader()),
958 _protection_domain,
959 false,
960 CHECK);
961 }
962
963 if (!interf->is_interface()) {
964 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
965 err_msg("class %s can not implement %s, because it is not an interface (%s)",
966 _class_name->as_klass_external_name(),
967 interf->external_name(),
968 interf->class_in_module_of_loader()));
969 }
970
971 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
972 *has_nonstatic_concrete_methods = true;
973 }
974 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
975 }
976
977 if (!_need_verify || itfs_len <= 1) {
978 return;
979 }
980
981 // Check if there's any duplicates in interfaces
982 ResourceMark rm(THREAD);
983 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
984 NameSigHash*,
985 HASH_ROW_SIZE);
986 initialize_hashtable(interface_names);
987 bool dup = false;
988 const Symbol* name = NULL;
989 {
990 debug_only(NoSafepointVerifier nsv;)
991 for (index = 0; index < itfs_len; index++) {
992 const InstanceKlass* const k = _local_interfaces->at(index);
993 name = k->name();
994 // If no duplicates, add (name, NULL) in hashtable interface_names.
995 if (!put_after_lookup(name, NULL, interface_names)) {
996 dup = true;
997 break;
998 }
999 }
1000 }
1001 if (dup) {
1002 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
1003 name->as_C_string(), CHECK);
1004 }
1005 }
1006 }
1007
verify_constantvalue(const ConstantPool * const cp,int constantvalue_index,int signature_index,TRAPS) const1008 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
1009 int constantvalue_index,
1010 int signature_index,
1011 TRAPS) const {
1012 // Make sure the constant pool entry is of a type appropriate to this field
1013 guarantee_property(
1014 (constantvalue_index > 0 &&
1015 constantvalue_index < cp->length()),
1016 "Bad initial value index %u in ConstantValue attribute in class file %s",
1017 constantvalue_index, CHECK);
1018
1019 const constantTag value_type = cp->tag_at(constantvalue_index);
1020 switch(cp->basic_type_for_signature_at(signature_index)) {
1021 case T_LONG: {
1022 guarantee_property(value_type.is_long(),
1023 "Inconsistent constant value type in class file %s",
1024 CHECK);
1025 break;
1026 }
1027 case T_FLOAT: {
1028 guarantee_property(value_type.is_float(),
1029 "Inconsistent constant value type in class file %s",
1030 CHECK);
1031 break;
1032 }
1033 case T_DOUBLE: {
1034 guarantee_property(value_type.is_double(),
1035 "Inconsistent constant value type in class file %s",
1036 CHECK);
1037 break;
1038 }
1039 case T_BYTE:
1040 case T_CHAR:
1041 case T_SHORT:
1042 case T_BOOLEAN:
1043 case T_INT: {
1044 guarantee_property(value_type.is_int(),
1045 "Inconsistent constant value type in class file %s",
1046 CHECK);
1047 break;
1048 }
1049 case T_OBJECT: {
1050 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1051 && value_type.is_string()),
1052 "Bad string initial value in class file %s",
1053 CHECK);
1054 break;
1055 }
1056 default: {
1057 classfile_parse_error("Unable to set initial value %u in class file %s",
1058 constantvalue_index,
1059 CHECK);
1060 }
1061 }
1062 }
1063
1064 class AnnotationCollector : public ResourceObj{
1065 public:
1066 enum Location { _in_field, _in_method, _in_class };
1067 enum ID {
1068 _unknown = 0,
1069 _method_CallerSensitive,
1070 _method_ForceInline,
1071 _method_DontInline,
1072 _method_InjectedProfile,
1073 _method_LambdaForm_Compiled,
1074 _method_Hidden,
1075 _method_HotSpotIntrinsicCandidate,
1076 _jdk_internal_vm_annotation_Contended,
1077 _field_Stable,
1078 _jdk_internal_vm_annotation_ReservedStackAccess,
1079 _annotation_LIMIT
1080 };
1081 const Location _location;
1082 int _annotations_present;
1083 u2 _contended_group;
1084
AnnotationCollector(Location location)1085 AnnotationCollector(Location location)
1086 : _location(location), _annotations_present(0)
1087 {
1088 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1089 }
1090 // If this annotation name has an ID, report it (or _none).
1091 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1092 // Set the annotation name:
set_annotation(ID id)1093 void set_annotation(ID id) {
1094 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1095 _annotations_present |= nth_bit((int)id);
1096 }
1097
remove_annotation(ID id)1098 void remove_annotation(ID id) {
1099 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1100 _annotations_present &= ~nth_bit((int)id);
1101 }
1102
1103 // Report if the annotation is present.
has_any_annotations() const1104 bool has_any_annotations() const { return _annotations_present != 0; }
has_annotation(ID id) const1105 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1106
set_contended_group(u2 group)1107 void set_contended_group(u2 group) { _contended_group = group; }
contended_group() const1108 u2 contended_group() const { return _contended_group; }
1109
is_contended() const1110 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1111
set_stable(bool stable)1112 void set_stable(bool stable) { set_annotation(_field_Stable); }
is_stable() const1113 bool is_stable() const { return has_annotation(_field_Stable); }
1114 };
1115
1116 // This class also doubles as a holder for metadata cleanup.
1117 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1118 private:
1119 ClassLoaderData* _loader_data;
1120 AnnotationArray* _field_annotations;
1121 AnnotationArray* _field_type_annotations;
1122 public:
FieldAnnotationCollector(ClassLoaderData * loader_data)1123 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1124 AnnotationCollector(_in_field),
1125 _loader_data(loader_data),
1126 _field_annotations(NULL),
1127 _field_type_annotations(NULL) {}
1128 ~FieldAnnotationCollector();
1129 void apply_to(FieldInfo* f);
field_annotations()1130 AnnotationArray* field_annotations() { return _field_annotations; }
field_type_annotations()1131 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1132
set_field_annotations(AnnotationArray * a)1133 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
set_field_type_annotations(AnnotationArray * a)1134 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1135 };
1136
1137 class MethodAnnotationCollector : public AnnotationCollector{
1138 public:
MethodAnnotationCollector()1139 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1140 void apply_to(const methodHandle& m);
1141 };
1142
1143 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1144 public:
ClassAnnotationCollector()1145 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1146 void apply_to(InstanceKlass* ik);
1147 };
1148
1149
1150 static int skip_annotation_value(const u1*, int, int); // fwd decl
1151
1152 // Safely increment index by val if does not pass limit
1153 #define SAFE_ADD(index, limit, val) \
1154 if (index >= limit - val) return limit; \
1155 index += val;
1156
1157 // Skip an annotation. Return >=limit if there is any problem.
skip_annotation(const u1 * buffer,int limit,int index)1158 static int skip_annotation(const u1* buffer, int limit, int index) {
1159 assert(buffer != NULL, "invariant");
1160 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1161 // value := switch (tag:u1) { ... }
1162 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1163 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1164 while (--nmem >= 0 && index < limit) {
1165 SAFE_ADD(index, limit, 2); // skip member
1166 index = skip_annotation_value(buffer, limit, index);
1167 }
1168 return index;
1169 }
1170
1171 // Skip an annotation value. Return >=limit if there is any problem.
skip_annotation_value(const u1 * buffer,int limit,int index)1172 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1173 assert(buffer != NULL, "invariant");
1174
1175 // value := switch (tag:u1) {
1176 // case B, C, I, S, Z, D, F, J, c: con:u2;
1177 // case e: e_class:u2 e_name:u2;
1178 // case s: s_con:u2;
1179 // case [: do(nval:u2) {value};
1180 // case @: annotation;
1181 // case s: s_con:u2;
1182 // }
1183 SAFE_ADD(index, limit, 1); // read tag
1184 const u1 tag = buffer[index - 1];
1185 switch (tag) {
1186 case 'B':
1187 case 'C':
1188 case 'I':
1189 case 'S':
1190 case 'Z':
1191 case 'D':
1192 case 'F':
1193 case 'J':
1194 case 'c':
1195 case 's':
1196 SAFE_ADD(index, limit, 2); // skip con or s_con
1197 break;
1198 case 'e':
1199 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1200 break;
1201 case '[':
1202 {
1203 SAFE_ADD(index, limit, 2); // read nval
1204 int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1205 while (--nval >= 0 && index < limit) {
1206 index = skip_annotation_value(buffer, limit, index);
1207 }
1208 }
1209 break;
1210 case '@':
1211 index = skip_annotation(buffer, limit, index);
1212 break;
1213 default:
1214 return limit; // bad tag byte
1215 }
1216 return index;
1217 }
1218
1219 // Sift through annotations, looking for those significant to the VM:
parse_annotations(const ConstantPool * const cp,const u1 * buffer,int limit,AnnotationCollector * coll,ClassLoaderData * loader_data,TRAPS)1220 static void parse_annotations(const ConstantPool* const cp,
1221 const u1* buffer, int limit,
1222 AnnotationCollector* coll,
1223 ClassLoaderData* loader_data,
1224 TRAPS) {
1225
1226 assert(cp != NULL, "invariant");
1227 assert(buffer != NULL, "invariant");
1228 assert(coll != NULL, "invariant");
1229 assert(loader_data != NULL, "invariant");
1230
1231 // annotations := do(nann:u2) {annotation}
1232 int index = 2; // read nann
1233 if (index >= limit) return;
1234 int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1235 enum { // initial annotation layout
1236 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1237 count_off = 2, // u2 such as 1 (one value)
1238 member_off = 4, // utf8 such as 'value'
1239 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1240 e_tag_val = 'e',
1241 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1242 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1243 e_size = 11, // end of 'e' annotation
1244 c_tag_val = 'c', // payload is type
1245 c_con_off = 7, // utf8 payload, such as 'I'
1246 c_size = 9, // end of 'c' annotation
1247 s_tag_val = 's', // payload is String
1248 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1249 s_size = 9,
1250 min_size = 6 // smallest possible size (zero members)
1251 };
1252 // Cannot add min_size to index in case of overflow MAX_INT
1253 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1254 int index0 = index;
1255 index = skip_annotation(buffer, limit, index);
1256 const u1* const abase = buffer + index0;
1257 const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1258 const int count = Bytes::get_Java_u2((address)abase + count_off);
1259 const Symbol* const aname = check_symbol_at(cp, atype);
1260 if (aname == NULL) break; // invalid annotation name
1261 const Symbol* member = NULL;
1262 if (count >= 1) {
1263 const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1264 member = check_symbol_at(cp, member_index);
1265 if (member == NULL) break; // invalid member name
1266 }
1267
1268 // Here is where parsing particular annotations will take place.
1269 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1270 if (AnnotationCollector::_unknown == id) continue;
1271 coll->set_annotation(id);
1272
1273 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1274 // @Contended can optionally specify the contention group.
1275 //
1276 // Contended group defines the equivalence class over the fields:
1277 // the fields within the same contended group are not treated distinct.
1278 // The only exception is default group, which does not incur the
1279 // equivalence. Naturally, contention group for classes is meaningless.
1280 //
1281 // While the contention group is specified as String, annotation
1282 // values are already interned, and we might as well use the constant
1283 // pool index as the group tag.
1284 //
1285 u2 group_index = 0; // default contended group
1286 if (count == 1
1287 && s_size == (index - index0) // match size
1288 && s_tag_val == *(abase + tag_off)
1289 && member == vmSymbols::value_name()) {
1290 group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1291 if (cp->symbol_at(group_index)->utf8_length() == 0) {
1292 group_index = 0; // default contended group
1293 }
1294 }
1295 coll->set_contended_group(group_index);
1296 }
1297 }
1298 }
1299
1300
1301 // Parse attributes for a field.
parse_field_attributes(const ClassFileStream * const cfs,u2 attributes_count,bool is_static,u2 signature_index,u2 * const constantvalue_index_addr,bool * const is_synthetic_addr,u2 * const generic_signature_index_addr,ClassFileParser::FieldAnnotationCollector * parsed_annotations,TRAPS)1302 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1303 u2 attributes_count,
1304 bool is_static, u2 signature_index,
1305 u2* const constantvalue_index_addr,
1306 bool* const is_synthetic_addr,
1307 u2* const generic_signature_index_addr,
1308 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1309 TRAPS) {
1310 assert(cfs != NULL, "invariant");
1311 assert(constantvalue_index_addr != NULL, "invariant");
1312 assert(is_synthetic_addr != NULL, "invariant");
1313 assert(generic_signature_index_addr != NULL, "invariant");
1314 assert(parsed_annotations != NULL, "invariant");
1315 assert(attributes_count > 0, "attributes_count should be greater than 0");
1316
1317 u2 constantvalue_index = 0;
1318 u2 generic_signature_index = 0;
1319 bool is_synthetic = false;
1320 const u1* runtime_visible_annotations = NULL;
1321 int runtime_visible_annotations_length = 0;
1322 const u1* runtime_invisible_annotations = NULL;
1323 int runtime_invisible_annotations_length = 0;
1324 const u1* runtime_visible_type_annotations = NULL;
1325 int runtime_visible_type_annotations_length = 0;
1326 const u1* runtime_invisible_type_annotations = NULL;
1327 int runtime_invisible_type_annotations_length = 0;
1328 bool runtime_invisible_annotations_exists = false;
1329 bool runtime_invisible_type_annotations_exists = false;
1330 const ConstantPool* const cp = _cp;
1331
1332 while (attributes_count--) {
1333 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
1334 const u2 attribute_name_index = cfs->get_u2_fast();
1335 const u4 attribute_length = cfs->get_u4_fast();
1336 check_property(valid_symbol_at(attribute_name_index),
1337 "Invalid field attribute index %u in class file %s",
1338 attribute_name_index,
1339 CHECK);
1340
1341 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1342 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1343 // ignore if non-static
1344 if (constantvalue_index != 0) {
1345 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1346 }
1347 check_property(
1348 attribute_length == 2,
1349 "Invalid ConstantValue field attribute length %u in class file %s",
1350 attribute_length, CHECK);
1351
1352 constantvalue_index = cfs->get_u2(CHECK);
1353 if (_need_verify) {
1354 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1355 }
1356 } else if (attribute_name == vmSymbols::tag_synthetic()) {
1357 if (attribute_length != 0) {
1358 classfile_parse_error(
1359 "Invalid Synthetic field attribute length %u in class file %s",
1360 attribute_length, CHECK);
1361 }
1362 is_synthetic = true;
1363 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1364 if (attribute_length != 0) {
1365 classfile_parse_error(
1366 "Invalid Deprecated field attribute length %u in class file %s",
1367 attribute_length, CHECK);
1368 }
1369 } else if (_major_version >= JAVA_1_5_VERSION) {
1370 if (attribute_name == vmSymbols::tag_signature()) {
1371 if (generic_signature_index != 0) {
1372 classfile_parse_error(
1373 "Multiple Signature attributes for field in class file %s", CHECK);
1374 }
1375 if (attribute_length != 2) {
1376 classfile_parse_error(
1377 "Wrong size %u for field's Signature attribute in class file %s",
1378 attribute_length, CHECK);
1379 }
1380 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1381 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1382 if (runtime_visible_annotations != NULL) {
1383 classfile_parse_error(
1384 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1385 }
1386 runtime_visible_annotations_length = attribute_length;
1387 runtime_visible_annotations = cfs->current();
1388 assert(runtime_visible_annotations != NULL, "null visible annotations");
1389 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1390 parse_annotations(cp,
1391 runtime_visible_annotations,
1392 runtime_visible_annotations_length,
1393 parsed_annotations,
1394 _loader_data,
1395 CHECK);
1396 cfs->skip_u1_fast(runtime_visible_annotations_length);
1397 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1398 if (runtime_invisible_annotations_exists) {
1399 classfile_parse_error(
1400 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1401 }
1402 runtime_invisible_annotations_exists = true;
1403 if (PreserveAllAnnotations) {
1404 runtime_invisible_annotations_length = attribute_length;
1405 runtime_invisible_annotations = cfs->current();
1406 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1407 }
1408 cfs->skip_u1(attribute_length, CHECK);
1409 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1410 if (runtime_visible_type_annotations != NULL) {
1411 classfile_parse_error(
1412 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1413 }
1414 runtime_visible_type_annotations_length = attribute_length;
1415 runtime_visible_type_annotations = cfs->current();
1416 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1417 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1418 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1419 if (runtime_invisible_type_annotations_exists) {
1420 classfile_parse_error(
1421 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1422 } else {
1423 runtime_invisible_type_annotations_exists = true;
1424 }
1425 if (PreserveAllAnnotations) {
1426 runtime_invisible_type_annotations_length = attribute_length;
1427 runtime_invisible_type_annotations = cfs->current();
1428 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1429 }
1430 cfs->skip_u1(attribute_length, CHECK);
1431 } else {
1432 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1433 }
1434 } else {
1435 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
1436 }
1437 }
1438
1439 *constantvalue_index_addr = constantvalue_index;
1440 *is_synthetic_addr = is_synthetic;
1441 *generic_signature_index_addr = generic_signature_index;
1442 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1443 runtime_visible_annotations_length,
1444 runtime_invisible_annotations,
1445 runtime_invisible_annotations_length,
1446 CHECK);
1447 parsed_annotations->set_field_annotations(a);
1448 a = assemble_annotations(runtime_visible_type_annotations,
1449 runtime_visible_type_annotations_length,
1450 runtime_invisible_type_annotations,
1451 runtime_invisible_type_annotations_length,
1452 CHECK);
1453 parsed_annotations->set_field_type_annotations(a);
1454 return;
1455 }
1456
1457
1458 // Field allocation types. Used for computing field offsets.
1459
1460 enum FieldAllocationType {
1461 STATIC_OOP, // Oops
1462 STATIC_BYTE, // Boolean, Byte, char
1463 STATIC_SHORT, // shorts
1464 STATIC_WORD, // ints
1465 STATIC_DOUBLE, // aligned long or double
1466 NONSTATIC_OOP,
1467 NONSTATIC_BYTE,
1468 NONSTATIC_SHORT,
1469 NONSTATIC_WORD,
1470 NONSTATIC_DOUBLE,
1471 MAX_FIELD_ALLOCATION_TYPE,
1472 BAD_ALLOCATION_TYPE = -1
1473 };
1474
1475 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1476 BAD_ALLOCATION_TYPE, // 0
1477 BAD_ALLOCATION_TYPE, // 1
1478 BAD_ALLOCATION_TYPE, // 2
1479 BAD_ALLOCATION_TYPE, // 3
1480 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1481 NONSTATIC_SHORT, // T_CHAR = 5,
1482 NONSTATIC_WORD, // T_FLOAT = 6,
1483 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1484 NONSTATIC_BYTE, // T_BYTE = 8,
1485 NONSTATIC_SHORT, // T_SHORT = 9,
1486 NONSTATIC_WORD, // T_INT = 10,
1487 NONSTATIC_DOUBLE, // T_LONG = 11,
1488 NONSTATIC_OOP, // T_OBJECT = 12,
1489 NONSTATIC_OOP, // T_ARRAY = 13,
1490 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1491 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1492 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1493 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1494 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1495 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1496 BAD_ALLOCATION_TYPE, // 0
1497 BAD_ALLOCATION_TYPE, // 1
1498 BAD_ALLOCATION_TYPE, // 2
1499 BAD_ALLOCATION_TYPE, // 3
1500 STATIC_BYTE , // T_BOOLEAN = 4,
1501 STATIC_SHORT, // T_CHAR = 5,
1502 STATIC_WORD, // T_FLOAT = 6,
1503 STATIC_DOUBLE, // T_DOUBLE = 7,
1504 STATIC_BYTE, // T_BYTE = 8,
1505 STATIC_SHORT, // T_SHORT = 9,
1506 STATIC_WORD, // T_INT = 10,
1507 STATIC_DOUBLE, // T_LONG = 11,
1508 STATIC_OOP, // T_OBJECT = 12,
1509 STATIC_OOP, // T_ARRAY = 13,
1510 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1511 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1512 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1513 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1514 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1515 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1516 };
1517
basic_type_to_atype(bool is_static,BasicType type)1518 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1519 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1520 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1521 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1522 return result;
1523 }
1524
1525 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1526 public:
1527 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1528
FieldAllocationCount()1529 FieldAllocationCount() {
1530 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1531 count[i] = 0;
1532 }
1533 }
1534
update(bool is_static,BasicType type)1535 FieldAllocationType update(bool is_static, BasicType type) {
1536 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1537 if (atype != BAD_ALLOCATION_TYPE) {
1538 // Make sure there is no overflow with injected fields.
1539 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1540 count[atype]++;
1541 }
1542 return atype;
1543 }
1544 };
1545
1546 // Side-effects: populates the _fields, _fields_annotations,
1547 // _fields_type_annotations fields
parse_fields(const ClassFileStream * const cfs,bool is_interface,FieldAllocationCount * const fac,ConstantPool * cp,const int cp_size,u2 * const java_fields_count_ptr,TRAPS)1548 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1549 bool is_interface,
1550 FieldAllocationCount* const fac,
1551 ConstantPool* cp,
1552 const int cp_size,
1553 u2* const java_fields_count_ptr,
1554 TRAPS) {
1555
1556 assert(cfs != NULL, "invariant");
1557 assert(fac != NULL, "invariant");
1558 assert(cp != NULL, "invariant");
1559 assert(java_fields_count_ptr != NULL, "invariant");
1560
1561 assert(NULL == _fields, "invariant");
1562 assert(NULL == _fields_annotations, "invariant");
1563 assert(NULL == _fields_type_annotations, "invariant");
1564
1565 cfs->guarantee_more(2, CHECK); // length
1566 const u2 length = cfs->get_u2_fast();
1567 *java_fields_count_ptr = length;
1568
1569 int num_injected = 0;
1570 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1571 &num_injected);
1572 const int total_fields = length + num_injected;
1573
1574 // The field array starts with tuples of shorts
1575 // [access, name index, sig index, initial value index, byte offset].
1576 // A generic signature slot only exists for field with generic
1577 // signature attribute. And the access flag is set with
1578 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1579 // signature slots are at the end of the field array and after all
1580 // other fields data.
1581 //
1582 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1583 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1584 // ...
1585 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1586 // [generic signature index]
1587 // [generic signature index]
1588 // ...
1589 //
1590 // Allocate a temporary resource array for field data. For each field,
1591 // a slot is reserved in the temporary array for the generic signature
1592 // index. After parsing all fields, the data are copied to a permanent
1593 // array and any unused slots will be discarded.
1594 ResourceMark rm(THREAD);
1595 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1596 u2,
1597 total_fields * (FieldInfo::field_slots + 1));
1598
1599 // The generic signature slots start after all other fields' data.
1600 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1601 int num_generic_signature = 0;
1602 for (int n = 0; n < length; n++) {
1603 // access_flags, name_index, descriptor_index, attributes_count
1604 cfs->guarantee_more(8, CHECK);
1605
1606 AccessFlags access_flags;
1607 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1608 verify_legal_field_modifiers(flags, is_interface, CHECK);
1609 access_flags.set_flags(flags);
1610
1611 const u2 name_index = cfs->get_u2_fast();
1612 check_property(valid_symbol_at(name_index),
1613 "Invalid constant pool index %u for field name in class file %s",
1614 name_index, CHECK);
1615 const Symbol* const name = cp->symbol_at(name_index);
1616 verify_legal_field_name(name, CHECK);
1617
1618 const u2 signature_index = cfs->get_u2_fast();
1619 check_property(valid_symbol_at(signature_index),
1620 "Invalid constant pool index %u for field signature in class file %s",
1621 signature_index, CHECK);
1622 const Symbol* const sig = cp->symbol_at(signature_index);
1623 verify_legal_field_signature(name, sig, CHECK);
1624
1625 u2 constantvalue_index = 0;
1626 bool is_synthetic = false;
1627 u2 generic_signature_index = 0;
1628 const bool is_static = access_flags.is_static();
1629 FieldAnnotationCollector parsed_annotations(_loader_data);
1630
1631 const u2 attributes_count = cfs->get_u2_fast();
1632 if (attributes_count > 0) {
1633 parse_field_attributes(cfs,
1634 attributes_count,
1635 is_static,
1636 signature_index,
1637 &constantvalue_index,
1638 &is_synthetic,
1639 &generic_signature_index,
1640 &parsed_annotations,
1641 CHECK);
1642
1643 if (parsed_annotations.field_annotations() != NULL) {
1644 if (_fields_annotations == NULL) {
1645 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1646 _loader_data, length, NULL,
1647 CHECK);
1648 }
1649 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1650 parsed_annotations.set_field_annotations(NULL);
1651 }
1652 if (parsed_annotations.field_type_annotations() != NULL) {
1653 if (_fields_type_annotations == NULL) {
1654 _fields_type_annotations =
1655 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1656 length,
1657 NULL,
1658 CHECK);
1659 }
1660 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1661 parsed_annotations.set_field_type_annotations(NULL);
1662 }
1663
1664 if (is_synthetic) {
1665 access_flags.set_is_synthetic();
1666 }
1667 if (generic_signature_index != 0) {
1668 access_flags.set_field_has_generic_signature();
1669 fa[generic_signature_slot] = generic_signature_index;
1670 generic_signature_slot ++;
1671 num_generic_signature ++;
1672 }
1673 }
1674
1675 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1676 field->initialize(access_flags.as_short(),
1677 name_index,
1678 signature_index,
1679 constantvalue_index);
1680 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1681
1682 // Remember how many oops we encountered and compute allocation type
1683 const FieldAllocationType atype = fac->update(is_static, type);
1684 field->set_allocation_type(atype);
1685
1686 // After field is initialized with type, we can augment it with aux info
1687 if (parsed_annotations.has_any_annotations())
1688 parsed_annotations.apply_to(field);
1689 }
1690
1691 int index = length;
1692 if (num_injected != 0) {
1693 for (int n = 0; n < num_injected; n++) {
1694 // Check for duplicates
1695 if (injected[n].may_be_java) {
1696 const Symbol* const name = injected[n].name();
1697 const Symbol* const signature = injected[n].signature();
1698 bool duplicate = false;
1699 for (int i = 0; i < length; i++) {
1700 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1701 if (name == cp->symbol_at(f->name_index()) &&
1702 signature == cp->symbol_at(f->signature_index())) {
1703 // Symbol is desclared in Java so skip this one
1704 duplicate = true;
1705 break;
1706 }
1707 }
1708 if (duplicate) {
1709 // These will be removed from the field array at the end
1710 continue;
1711 }
1712 }
1713
1714 // Injected field
1715 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1716 field->initialize(JVM_ACC_FIELD_INTERNAL,
1717 injected[n].name_index,
1718 injected[n].signature_index,
1719 0);
1720
1721 const BasicType type = FieldType::basic_type(injected[n].signature());
1722
1723 // Remember how many oops we encountered and compute allocation type
1724 const FieldAllocationType atype = fac->update(false, type);
1725 field->set_allocation_type(atype);
1726 index++;
1727 }
1728 }
1729
1730 assert(NULL == _fields, "invariant");
1731
1732 _fields =
1733 MetadataFactory::new_array<u2>(_loader_data,
1734 index * FieldInfo::field_slots + num_generic_signature,
1735 CHECK);
1736 // Sometimes injected fields already exist in the Java source so
1737 // the fields array could be too long. In that case the
1738 // fields array is trimed. Also unused slots that were reserved
1739 // for generic signature indexes are discarded.
1740 {
1741 int i = 0;
1742 for (; i < index * FieldInfo::field_slots; i++) {
1743 _fields->at_put(i, fa[i]);
1744 }
1745 for (int j = total_fields * FieldInfo::field_slots;
1746 j < generic_signature_slot; j++) {
1747 _fields->at_put(i++, fa[j]);
1748 }
1749 assert(_fields->length() == i, "");
1750 }
1751
1752 if (_need_verify && length > 1) {
1753 // Check duplicated fields
1754 ResourceMark rm(THREAD);
1755 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1756 THREAD, NameSigHash*, HASH_ROW_SIZE);
1757 initialize_hashtable(names_and_sigs);
1758 bool dup = false;
1759 const Symbol* name = NULL;
1760 const Symbol* sig = NULL;
1761 {
1762 debug_only(NoSafepointVerifier nsv;)
1763 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1764 name = fs.name();
1765 sig = fs.signature();
1766 // If no duplicates, add name/signature in hashtable names_and_sigs.
1767 if (!put_after_lookup(name, sig, names_and_sigs)) {
1768 dup = true;
1769 break;
1770 }
1771 }
1772 }
1773 if (dup) {
1774 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1775 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1776 }
1777 }
1778 }
1779
1780
parse_exception_table(const ClassFileStream * const cfs,u4 code_length,u4 exception_table_length,TRAPS)1781 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1782 u4 code_length,
1783 u4 exception_table_length,
1784 TRAPS) {
1785 assert(cfs != NULL, "invariant");
1786
1787 const unsafe_u2* const exception_table_start = cfs->current();
1788 assert(exception_table_start != NULL, "null exception table");
1789
1790 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1791 // end_pc,
1792 // handler_pc,
1793 // catch_type_index
1794
1795 // Will check legal target after parsing code array in verifier.
1796 if (_need_verify) {
1797 for (unsigned int i = 0; i < exception_table_length; i++) {
1798 const u2 start_pc = cfs->get_u2_fast();
1799 const u2 end_pc = cfs->get_u2_fast();
1800 const u2 handler_pc = cfs->get_u2_fast();
1801 const u2 catch_type_index = cfs->get_u2_fast();
1802 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1803 "Illegal exception table range in class file %s",
1804 CHECK_NULL);
1805 guarantee_property(handler_pc < code_length,
1806 "Illegal exception table handler in class file %s",
1807 CHECK_NULL);
1808 if (catch_type_index != 0) {
1809 guarantee_property(valid_klass_reference_at(catch_type_index),
1810 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1811 }
1812 }
1813 } else {
1814 cfs->skip_u2_fast(exception_table_length * 4);
1815 }
1816 return exception_table_start;
1817 }
1818
parse_linenumber_table(u4 code_attribute_length,u4 code_length,CompressedLineNumberWriteStream ** const write_stream,TRAPS)1819 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1820 u4 code_length,
1821 CompressedLineNumberWriteStream**const write_stream,
1822 TRAPS) {
1823
1824 const ClassFileStream* const cfs = _stream;
1825 unsigned int num_entries = cfs->get_u2(CHECK);
1826
1827 // Each entry is a u2 start_pc, and a u2 line_number
1828 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1829
1830 // Verify line number attribute and table length
1831 check_property(
1832 code_attribute_length == sizeof(u2) + length_in_bytes,
1833 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1834
1835 cfs->guarantee_more(length_in_bytes, CHECK);
1836
1837 if ((*write_stream) == NULL) {
1838 if (length_in_bytes > fixed_buffer_size) {
1839 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1840 } else {
1841 (*write_stream) = new CompressedLineNumberWriteStream(
1842 _linenumbertable_buffer, fixed_buffer_size);
1843 }
1844 }
1845
1846 while (num_entries-- > 0) {
1847 const u2 bci = cfs->get_u2_fast(); // start_pc
1848 const u2 line = cfs->get_u2_fast(); // line_number
1849 guarantee_property(bci < code_length,
1850 "Invalid pc in LineNumberTable in class file %s", CHECK);
1851 (*write_stream)->write_pair(bci, line);
1852 }
1853 }
1854
1855
1856 class LVT_Hash : public AllStatic {
1857 public:
1858
equals(LocalVariableTableElement const & e0,LocalVariableTableElement const & e1)1859 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1860 /*
1861 * 3-tuple start_bci/length/slot has to be unique key,
1862 * so the following comparison seems to be redundant:
1863 * && elem->name_cp_index == entry->_elem->name_cp_index
1864 */
1865 return (e0.start_bci == e1.start_bci &&
1866 e0.length == e1.length &&
1867 e0.name_cp_index == e1.name_cp_index &&
1868 e0.slot == e1.slot);
1869 }
1870
hash(LocalVariableTableElement const & e0)1871 static unsigned int hash(LocalVariableTableElement const& e0) {
1872 unsigned int raw_hash = e0.start_bci;
1873
1874 raw_hash = e0.length + raw_hash * 37;
1875 raw_hash = e0.name_cp_index + raw_hash * 37;
1876 raw_hash = e0.slot + raw_hash * 37;
1877
1878 return raw_hash;
1879 }
1880 };
1881
1882
1883 // Class file LocalVariableTable elements.
1884 class Classfile_LVT_Element {
1885 public:
1886 u2 start_bci;
1887 u2 length;
1888 u2 name_cp_index;
1889 u2 descriptor_cp_index;
1890 u2 slot;
1891 };
1892
copy_lvt_element(const Classfile_LVT_Element * const src,LocalVariableTableElement * const lvt)1893 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1894 LocalVariableTableElement* const lvt) {
1895 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1896 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1897 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1898 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1899 lvt->signature_cp_index = 0;
1900 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1901 }
1902
1903 // Function is used to parse both attributes:
1904 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
parse_localvariable_table(const ClassFileStream * cfs,u4 code_length,u2 max_locals,u4 code_attribute_length,u2 * const localvariable_table_length,bool isLVTT,TRAPS)1905 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1906 u4 code_length,
1907 u2 max_locals,
1908 u4 code_attribute_length,
1909 u2* const localvariable_table_length,
1910 bool isLVTT,
1911 TRAPS) {
1912 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1913 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1914 const unsigned int size =
1915 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1916
1917 const ConstantPool* const cp = _cp;
1918
1919 // Verify local variable table attribute has right length
1920 if (_need_verify) {
1921 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1922 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1923 }
1924
1925 const unsafe_u2* const localvariable_table_start = cfs->current();
1926 assert(localvariable_table_start != NULL, "null local variable table");
1927 if (!_need_verify) {
1928 cfs->skip_u2_fast(size);
1929 } else {
1930 cfs->guarantee_more(size * 2, CHECK_NULL);
1931 for(int i = 0; i < (*localvariable_table_length); i++) {
1932 const u2 start_pc = cfs->get_u2_fast();
1933 const u2 length = cfs->get_u2_fast();
1934 const u2 name_index = cfs->get_u2_fast();
1935 const u2 descriptor_index = cfs->get_u2_fast();
1936 const u2 index = cfs->get_u2_fast();
1937 // Assign to a u4 to avoid overflow
1938 const u4 end_pc = (u4)start_pc + (u4)length;
1939
1940 if (start_pc >= code_length) {
1941 classfile_parse_error(
1942 "Invalid start_pc %u in %s in class file %s",
1943 start_pc, tbl_name, CHECK_NULL);
1944 }
1945 if (end_pc > code_length) {
1946 classfile_parse_error(
1947 "Invalid length %u in %s in class file %s",
1948 length, tbl_name, CHECK_NULL);
1949 }
1950 const int cp_size = cp->length();
1951 guarantee_property(valid_symbol_at(name_index),
1952 "Name index %u in %s has bad constant type in class file %s",
1953 name_index, tbl_name, CHECK_NULL);
1954 guarantee_property(valid_symbol_at(descriptor_index),
1955 "Signature index %u in %s has bad constant type in class file %s",
1956 descriptor_index, tbl_name, CHECK_NULL);
1957
1958 const Symbol* const name = cp->symbol_at(name_index);
1959 const Symbol* const sig = cp->symbol_at(descriptor_index);
1960 verify_legal_field_name(name, CHECK_NULL);
1961 u2 extra_slot = 0;
1962 if (!isLVTT) {
1963 verify_legal_field_signature(name, sig, CHECK_NULL);
1964
1965 // 4894874: check special cases for double and long local variables
1966 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1967 sig == vmSymbols::type_signature(T_LONG)) {
1968 extra_slot = 1;
1969 }
1970 }
1971 guarantee_property((index + extra_slot) < max_locals,
1972 "Invalid index %u in %s in class file %s",
1973 index, tbl_name, CHECK_NULL);
1974 }
1975 }
1976 return localvariable_table_start;
1977 }
1978
parse_stackmap_table(const ClassFileStream * const cfs,u4 code_attribute_length,bool need_verify,TRAPS)1979 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1980 u4 code_attribute_length,
1981 bool need_verify,
1982 TRAPS) {
1983 assert(cfs != NULL, "invariant");
1984
1985 if (0 == code_attribute_length) {
1986 return NULL;
1987 }
1988
1989 const u1* const stackmap_table_start = cfs->current();
1990 assert(stackmap_table_start != NULL, "null stackmap table");
1991
1992 // check code_attribute_length first
1993 cfs->skip_u1(code_attribute_length, CHECK_NULL);
1994
1995 if (!need_verify && !DumpSharedSpaces) {
1996 return NULL;
1997 }
1998 return stackmap_table_start;
1999 }
2000
parse_checked_exceptions(const ClassFileStream * const cfs,u2 * const checked_exceptions_length,u4 method_attribute_length,TRAPS)2001 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2002 u2* const checked_exceptions_length,
2003 u4 method_attribute_length,
2004 TRAPS) {
2005 assert(cfs != NULL, "invariant");
2006 assert(checked_exceptions_length != NULL, "invariant");
2007
2008 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
2009 *checked_exceptions_length = cfs->get_u2_fast();
2010 const unsigned int size =
2011 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2012 const unsafe_u2* const checked_exceptions_start = cfs->current();
2013 assert(checked_exceptions_start != NULL, "null checked exceptions");
2014 if (!_need_verify) {
2015 cfs->skip_u2_fast(size);
2016 } else {
2017 // Verify each value in the checked exception table
2018 u2 checked_exception;
2019 const u2 len = *checked_exceptions_length;
2020 cfs->guarantee_more(2 * len, CHECK_NULL);
2021 for (int i = 0; i < len; i++) {
2022 checked_exception = cfs->get_u2_fast();
2023 check_property(
2024 valid_klass_reference_at(checked_exception),
2025 "Exception name has bad type at constant pool %u in class file %s",
2026 checked_exception, CHECK_NULL);
2027 }
2028 }
2029 // check exceptions attribute length
2030 if (_need_verify) {
2031 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2032 sizeof(u2) * size),
2033 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2034 }
2035 return checked_exceptions_start;
2036 }
2037
throwIllegalSignature(const char * type,const Symbol * name,const Symbol * sig,TRAPS) const2038 void ClassFileParser::throwIllegalSignature(const char* type,
2039 const Symbol* name,
2040 const Symbol* sig,
2041 TRAPS) const {
2042 assert(name != NULL, "invariant");
2043 assert(sig != NULL, "invariant");
2044
2045 ResourceMark rm(THREAD);
2046 Exceptions::fthrow(THREAD_AND_LOCATION,
2047 vmSymbols::java_lang_ClassFormatError(),
2048 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2049 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2050 }
2051
2052 AnnotationCollector::ID
annotation_index(const ClassLoaderData * loader_data,const Symbol * name)2053 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2054 const Symbol* name) {
2055 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2056 // Privileged code can use all annotations. Other code silently drops some.
2057 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2058 loader_data->is_platform_class_loader_data() ||
2059 loader_data->is_unsafe_anonymous();
2060 switch (sid) {
2061 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2062 if (_location != _in_method) break; // only allow for methods
2063 if (!privileged) break; // only allow in privileged code
2064 return _method_CallerSensitive;
2065 }
2066 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2067 if (_location != _in_method) break; // only allow for methods
2068 if (!privileged) break; // only allow in privileged code
2069 return _method_ForceInline;
2070 }
2071 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2072 if (_location != _in_method) break; // only allow for methods
2073 if (!privileged) break; // only allow in privileged code
2074 return _method_DontInline;
2075 }
2076 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2077 if (_location != _in_method) break; // only allow for methods
2078 if (!privileged) break; // only allow in privileged code
2079 return _method_InjectedProfile;
2080 }
2081 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2082 if (_location != _in_method) break; // only allow for methods
2083 if (!privileged) break; // only allow in privileged code
2084 return _method_LambdaForm_Compiled;
2085 }
2086 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
2087 if (_location != _in_method) break; // only allow for methods
2088 if (!privileged) break; // only allow in privileged code
2089 return _method_Hidden;
2090 }
2091 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2092 if (_location != _in_method) break; // only allow for methods
2093 if (!privileged) break; // only allow in privileged code
2094 return _method_HotSpotIntrinsicCandidate;
2095 }
2096 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2097 if (_location != _in_field) break; // only allow for fields
2098 if (!privileged) break; // only allow in privileged code
2099 return _field_Stable;
2100 }
2101 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2102 if (_location != _in_field && _location != _in_class) {
2103 break; // only allow for fields and classes
2104 }
2105 if (!EnableContended || (RestrictContended && !privileged)) {
2106 break; // honor privileges
2107 }
2108 return _jdk_internal_vm_annotation_Contended;
2109 }
2110 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2111 if (_location != _in_method) break; // only allow for methods
2112 if (RestrictReservedStack && !privileged) break; // honor privileges
2113 return _jdk_internal_vm_annotation_ReservedStackAccess;
2114 }
2115 default: {
2116 break;
2117 }
2118 }
2119 return AnnotationCollector::_unknown;
2120 }
2121
apply_to(FieldInfo * f)2122 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2123 if (is_contended())
2124 f->set_contended_group(contended_group());
2125 if (is_stable())
2126 f->set_stable(true);
2127 }
2128
~FieldAnnotationCollector()2129 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2130 // If there's an error deallocate metadata for field annotations
2131 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2132 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2133 }
2134
apply_to(const methodHandle & m)2135 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2136 if (has_annotation(_method_CallerSensitive))
2137 m->set_caller_sensitive(true);
2138 if (has_annotation(_method_ForceInline))
2139 m->set_force_inline(true);
2140 if (has_annotation(_method_DontInline))
2141 m->set_dont_inline(true);
2142 if (has_annotation(_method_InjectedProfile))
2143 m->set_has_injected_profile(true);
2144 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2145 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2146 if (has_annotation(_method_Hidden))
2147 m->set_hidden(true);
2148 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2149 m->set_intrinsic_candidate(true);
2150 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2151 m->set_has_reserved_stack_access(true);
2152 }
2153
apply_to(InstanceKlass * ik)2154 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2155 assert(ik != NULL, "invariant");
2156 ik->set_is_contended(is_contended());
2157 }
2158
2159 #define MAX_ARGS_SIZE 255
2160 #define MAX_CODE_SIZE 65535
2161 #define INITIAL_MAX_LVT_NUMBER 256
2162
2163 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2164 *
2165 * Rules for LVT's and LVTT's are:
2166 * - There can be any number of LVT's and LVTT's.
2167 * - If there are n LVT's, it is the same as if there was just
2168 * one LVT containing all the entries from the n LVT's.
2169 * - There may be no more than one LVT entry per local variable.
2170 * Two LVT entries are 'equal' if these fields are the same:
2171 * start_pc, length, name, slot
2172 * - There may be no more than one LVTT entry per each LVT entry.
2173 * Each LVTT entry has to match some LVT entry.
2174 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2175 */
copy_localvariable_table(const ConstMethod * cm,int lvt_cnt,u2 * const localvariable_table_length,const unsafe_u2 ** const localvariable_table_start,int lvtt_cnt,u2 * const localvariable_type_table_length,const unsafe_u2 ** const localvariable_type_table_start,TRAPS)2176 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2177 int lvt_cnt,
2178 u2* const localvariable_table_length,
2179 const unsafe_u2** const localvariable_table_start,
2180 int lvtt_cnt,
2181 u2* const localvariable_type_table_length,
2182 const unsafe_u2** const localvariable_type_table_start,
2183 TRAPS) {
2184
2185 ResourceMark rm(THREAD);
2186
2187 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2188 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2189
2190 LVT_HashTable* const table = new LVT_HashTable();
2191
2192 // To fill LocalVariableTable in
2193 const Classfile_LVT_Element* cf_lvt;
2194 LocalVariableTableElement* lvt = cm->localvariable_table_start();
2195
2196 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2197 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2198 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2199 copy_lvt_element(&cf_lvt[idx], lvt);
2200 // If no duplicates, add LVT elem in hashtable.
2201 if (table->put(*lvt, lvt) == false
2202 && _need_verify
2203 && _major_version >= JAVA_1_5_VERSION) {
2204 classfile_parse_error("Duplicated LocalVariableTable attribute "
2205 "entry for '%s' in class file %s",
2206 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2207 CHECK);
2208 }
2209 }
2210 }
2211
2212 // To merge LocalVariableTable and LocalVariableTypeTable
2213 const Classfile_LVT_Element* cf_lvtt;
2214 LocalVariableTableElement lvtt_elem;
2215
2216 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2217 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2218 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2219 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2220 LocalVariableTableElement** entry = table->get(lvtt_elem);
2221 if (entry == NULL) {
2222 if (_need_verify) {
2223 classfile_parse_error("LVTT entry for '%s' in class file %s "
2224 "does not match any LVT entry",
2225 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2226 CHECK);
2227 }
2228 } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2229 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2230 "entry for '%s' in class file %s",
2231 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2232 CHECK);
2233 } else {
2234 // to add generic signatures into LocalVariableTable
2235 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2236 }
2237 }
2238 }
2239 }
2240
2241
copy_method_annotations(ConstMethod * cm,const u1 * runtime_visible_annotations,int runtime_visible_annotations_length,const u1 * runtime_invisible_annotations,int runtime_invisible_annotations_length,const u1 * runtime_visible_parameter_annotations,int runtime_visible_parameter_annotations_length,const u1 * runtime_invisible_parameter_annotations,int runtime_invisible_parameter_annotations_length,const u1 * runtime_visible_type_annotations,int runtime_visible_type_annotations_length,const u1 * runtime_invisible_type_annotations,int runtime_invisible_type_annotations_length,const u1 * annotation_default,int annotation_default_length,TRAPS)2242 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2243 const u1* runtime_visible_annotations,
2244 int runtime_visible_annotations_length,
2245 const u1* runtime_invisible_annotations,
2246 int runtime_invisible_annotations_length,
2247 const u1* runtime_visible_parameter_annotations,
2248 int runtime_visible_parameter_annotations_length,
2249 const u1* runtime_invisible_parameter_annotations,
2250 int runtime_invisible_parameter_annotations_length,
2251 const u1* runtime_visible_type_annotations,
2252 int runtime_visible_type_annotations_length,
2253 const u1* runtime_invisible_type_annotations,
2254 int runtime_invisible_type_annotations_length,
2255 const u1* annotation_default,
2256 int annotation_default_length,
2257 TRAPS) {
2258
2259 AnnotationArray* a;
2260
2261 if (runtime_visible_annotations_length +
2262 runtime_invisible_annotations_length > 0) {
2263 a = assemble_annotations(runtime_visible_annotations,
2264 runtime_visible_annotations_length,
2265 runtime_invisible_annotations,
2266 runtime_invisible_annotations_length,
2267 CHECK);
2268 cm->set_method_annotations(a);
2269 }
2270
2271 if (runtime_visible_parameter_annotations_length +
2272 runtime_invisible_parameter_annotations_length > 0) {
2273 a = assemble_annotations(runtime_visible_parameter_annotations,
2274 runtime_visible_parameter_annotations_length,
2275 runtime_invisible_parameter_annotations,
2276 runtime_invisible_parameter_annotations_length,
2277 CHECK);
2278 cm->set_parameter_annotations(a);
2279 }
2280
2281 if (annotation_default_length > 0) {
2282 a = assemble_annotations(annotation_default,
2283 annotation_default_length,
2284 NULL,
2285 0,
2286 CHECK);
2287 cm->set_default_annotations(a);
2288 }
2289
2290 if (runtime_visible_type_annotations_length +
2291 runtime_invisible_type_annotations_length > 0) {
2292 a = assemble_annotations(runtime_visible_type_annotations,
2293 runtime_visible_type_annotations_length,
2294 runtime_invisible_type_annotations,
2295 runtime_invisible_type_annotations_length,
2296 CHECK);
2297 cm->set_type_annotations(a);
2298 }
2299 }
2300
2301
2302 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2303 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2304 // Method* to save footprint, so we only know the size of the resulting Method* when the
2305 // entire method attribute is parsed.
2306 //
2307 // The promoted_flags parameter is used to pass relevant access_flags
2308 // from the method back up to the containing klass. These flag values
2309 // are added to klass's access_flags.
2310
parse_method(const ClassFileStream * const cfs,bool is_interface,const ConstantPool * cp,AccessFlags * const promoted_flags,TRAPS)2311 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2312 bool is_interface,
2313 const ConstantPool* cp,
2314 AccessFlags* const promoted_flags,
2315 TRAPS) {
2316 assert(cfs != NULL, "invariant");
2317 assert(cp != NULL, "invariant");
2318 assert(promoted_flags != NULL, "invariant");
2319
2320 ResourceMark rm(THREAD);
2321 // Parse fixed parts:
2322 // access_flags, name_index, descriptor_index, attributes_count
2323 cfs->guarantee_more(8, CHECK_NULL);
2324
2325 int flags = cfs->get_u2_fast();
2326 const u2 name_index = cfs->get_u2_fast();
2327 const int cp_size = cp->length();
2328 check_property(
2329 valid_symbol_at(name_index),
2330 "Illegal constant pool index %u for method name in class file %s",
2331 name_index, CHECK_NULL);
2332 const Symbol* const name = cp->symbol_at(name_index);
2333 verify_legal_method_name(name, CHECK_NULL);
2334
2335 const u2 signature_index = cfs->get_u2_fast();
2336 guarantee_property(
2337 valid_symbol_at(signature_index),
2338 "Illegal constant pool index %u for method signature in class file %s",
2339 signature_index, CHECK_NULL);
2340 const Symbol* const signature = cp->symbol_at(signature_index);
2341
2342 if (name == vmSymbols::class_initializer_name()) {
2343 // We ignore the other access flags for a valid class initializer.
2344 // (JVM Spec 2nd ed., chapter 4.6)
2345 if (_major_version < 51) { // backward compatibility
2346 flags = JVM_ACC_STATIC;
2347 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2348 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2349 } else {
2350 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2351 }
2352 } else {
2353 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2354 }
2355
2356 if (name == vmSymbols::object_initializer_name() && is_interface) {
2357 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2358 }
2359
2360 int args_size = -1; // only used when _need_verify is true
2361 if (_need_verify) {
2362 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2363 verify_legal_method_signature(name, signature, CHECK_NULL);
2364 if (args_size > MAX_ARGS_SIZE) {
2365 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2366 }
2367 }
2368
2369 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2370
2371 // Default values for code and exceptions attribute elements
2372 u2 max_stack = 0;
2373 u2 max_locals = 0;
2374 u4 code_length = 0;
2375 const u1* code_start = 0;
2376 u2 exception_table_length = 0;
2377 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2378 Array<int>* exception_handlers = Universe::the_empty_int_array();
2379 u2 checked_exceptions_length = 0;
2380 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2381 CompressedLineNumberWriteStream* linenumber_table = NULL;
2382 int linenumber_table_length = 0;
2383 int total_lvt_length = 0;
2384 u2 lvt_cnt = 0;
2385 u2 lvtt_cnt = 0;
2386 bool lvt_allocated = false;
2387 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2388 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2389 u2* localvariable_table_length = NULL;
2390 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2391 u2* localvariable_type_table_length = NULL;
2392 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2393 int method_parameters_length = -1;
2394 const u1* method_parameters_data = NULL;
2395 bool method_parameters_seen = false;
2396 bool parsed_code_attribute = false;
2397 bool parsed_checked_exceptions_attribute = false;
2398 bool parsed_stackmap_attribute = false;
2399 // stackmap attribute - JDK1.5
2400 const u1* stackmap_data = NULL;
2401 int stackmap_data_length = 0;
2402 u2 generic_signature_index = 0;
2403 MethodAnnotationCollector parsed_annotations;
2404 const u1* runtime_visible_annotations = NULL;
2405 int runtime_visible_annotations_length = 0;
2406 const u1* runtime_invisible_annotations = NULL;
2407 int runtime_invisible_annotations_length = 0;
2408 const u1* runtime_visible_parameter_annotations = NULL;
2409 int runtime_visible_parameter_annotations_length = 0;
2410 const u1* runtime_invisible_parameter_annotations = NULL;
2411 int runtime_invisible_parameter_annotations_length = 0;
2412 const u1* runtime_visible_type_annotations = NULL;
2413 int runtime_visible_type_annotations_length = 0;
2414 const u1* runtime_invisible_type_annotations = NULL;
2415 int runtime_invisible_type_annotations_length = 0;
2416 bool runtime_invisible_annotations_exists = false;
2417 bool runtime_invisible_type_annotations_exists = false;
2418 bool runtime_invisible_parameter_annotations_exists = false;
2419 const u1* annotation_default = NULL;
2420 int annotation_default_length = 0;
2421
2422 // Parse code and exceptions attribute
2423 u2 method_attributes_count = cfs->get_u2_fast();
2424 while (method_attributes_count--) {
2425 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
2426 const u2 method_attribute_name_index = cfs->get_u2_fast();
2427 const u4 method_attribute_length = cfs->get_u4_fast();
2428 check_property(
2429 valid_symbol_at(method_attribute_name_index),
2430 "Invalid method attribute name index %u in class file %s",
2431 method_attribute_name_index, CHECK_NULL);
2432
2433 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2434 if (method_attribute_name == vmSymbols::tag_code()) {
2435 // Parse Code attribute
2436 if (_need_verify) {
2437 guarantee_property(
2438 !access_flags.is_native() && !access_flags.is_abstract(),
2439 "Code attribute in native or abstract methods in class file %s",
2440 CHECK_NULL);
2441 }
2442 if (parsed_code_attribute) {
2443 classfile_parse_error("Multiple Code attributes in class file %s",
2444 CHECK_NULL);
2445 }
2446 parsed_code_attribute = true;
2447
2448 // Stack size, locals size, and code size
2449 if (_major_version == 45 && _minor_version <= 2) {
2450 cfs->guarantee_more(4, CHECK_NULL);
2451 max_stack = cfs->get_u1_fast();
2452 max_locals = cfs->get_u1_fast();
2453 code_length = cfs->get_u2_fast();
2454 } else {
2455 cfs->guarantee_more(8, CHECK_NULL);
2456 max_stack = cfs->get_u2_fast();
2457 max_locals = cfs->get_u2_fast();
2458 code_length = cfs->get_u4_fast();
2459 }
2460 if (_need_verify) {
2461 guarantee_property(args_size <= max_locals,
2462 "Arguments can't fit into locals in class file %s",
2463 CHECK_NULL);
2464 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2465 "Invalid method Code length %u in class file %s",
2466 code_length, CHECK_NULL);
2467 }
2468 // Code pointer
2469 code_start = cfs->current();
2470 assert(code_start != NULL, "null code start");
2471 cfs->guarantee_more(code_length, CHECK_NULL);
2472 cfs->skip_u1_fast(code_length);
2473
2474 // Exception handler table
2475 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
2476 exception_table_length = cfs->get_u2_fast();
2477 if (exception_table_length > 0) {
2478 exception_table_start = parse_exception_table(cfs,
2479 code_length,
2480 exception_table_length,
2481 CHECK_NULL);
2482 }
2483
2484 // Parse additional attributes in code attribute
2485 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
2486 u2 code_attributes_count = cfs->get_u2_fast();
2487
2488 unsigned int calculated_attribute_length = 0;
2489
2490 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2491 calculated_attribute_length =
2492 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2493 } else {
2494 // max_stack, locals and length are smaller in pre-version 45.2 classes
2495 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2496 }
2497 calculated_attribute_length +=
2498 code_length +
2499 sizeof(exception_table_length) +
2500 sizeof(code_attributes_count) +
2501 exception_table_length *
2502 ( sizeof(u2) + // start_pc
2503 sizeof(u2) + // end_pc
2504 sizeof(u2) + // handler_pc
2505 sizeof(u2) ); // catch_type_index
2506
2507 while (code_attributes_count--) {
2508 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
2509 const u2 code_attribute_name_index = cfs->get_u2_fast();
2510 const u4 code_attribute_length = cfs->get_u4_fast();
2511 calculated_attribute_length += code_attribute_length +
2512 sizeof(code_attribute_name_index) +
2513 sizeof(code_attribute_length);
2514 check_property(valid_symbol_at(code_attribute_name_index),
2515 "Invalid code attribute name index %u in class file %s",
2516 code_attribute_name_index,
2517 CHECK_NULL);
2518 if (LoadLineNumberTables &&
2519 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2520 // Parse and compress line number table
2521 parse_linenumber_table(code_attribute_length,
2522 code_length,
2523 &linenumber_table,
2524 CHECK_NULL);
2525
2526 } else if (LoadLocalVariableTables &&
2527 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2528 // Parse local variable table
2529 if (!lvt_allocated) {
2530 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2531 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2532 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2533 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2534 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2535 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2536 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2537 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2538 lvt_allocated = true;
2539 }
2540 if (lvt_cnt == max_lvt_cnt) {
2541 max_lvt_cnt <<= 1;
2542 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2543 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2544 }
2545 localvariable_table_start[lvt_cnt] =
2546 parse_localvariable_table(cfs,
2547 code_length,
2548 max_locals,
2549 code_attribute_length,
2550 &localvariable_table_length[lvt_cnt],
2551 false, // is not LVTT
2552 CHECK_NULL);
2553 total_lvt_length += localvariable_table_length[lvt_cnt];
2554 lvt_cnt++;
2555 } else if (LoadLocalVariableTypeTables &&
2556 _major_version >= JAVA_1_5_VERSION &&
2557 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2558 if (!lvt_allocated) {
2559 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2560 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2561 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2562 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2563 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2564 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2565 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2566 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2567 lvt_allocated = true;
2568 }
2569 // Parse local variable type table
2570 if (lvtt_cnt == max_lvtt_cnt) {
2571 max_lvtt_cnt <<= 1;
2572 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2573 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2574 }
2575 localvariable_type_table_start[lvtt_cnt] =
2576 parse_localvariable_table(cfs,
2577 code_length,
2578 max_locals,
2579 code_attribute_length,
2580 &localvariable_type_table_length[lvtt_cnt],
2581 true, // is LVTT
2582 CHECK_NULL);
2583 lvtt_cnt++;
2584 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2585 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2586 // Stack map is only needed by the new verifier in JDK1.5.
2587 if (parsed_stackmap_attribute) {
2588 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2589 }
2590 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2591 stackmap_data_length = code_attribute_length;
2592 parsed_stackmap_attribute = true;
2593 } else {
2594 // Skip unknown attributes
2595 cfs->skip_u1(code_attribute_length, CHECK_NULL);
2596 }
2597 }
2598 // check method attribute length
2599 if (_need_verify) {
2600 guarantee_property(method_attribute_length == calculated_attribute_length,
2601 "Code segment has wrong length in class file %s",
2602 CHECK_NULL);
2603 }
2604 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2605 // Parse Exceptions attribute
2606 if (parsed_checked_exceptions_attribute) {
2607 classfile_parse_error("Multiple Exceptions attributes in class file %s",
2608 CHECK_NULL);
2609 }
2610 parsed_checked_exceptions_attribute = true;
2611 checked_exceptions_start =
2612 parse_checked_exceptions(cfs,
2613 &checked_exceptions_length,
2614 method_attribute_length,
2615 CHECK_NULL);
2616 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2617 // reject multiple method parameters
2618 if (method_parameters_seen) {
2619 classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2620 CHECK_NULL);
2621 }
2622 method_parameters_seen = true;
2623 method_parameters_length = cfs->get_u1_fast();
2624 const u2 real_length = (method_parameters_length * 4u) + 1u;
2625 if (method_attribute_length != real_length) {
2626 classfile_parse_error(
2627 "Invalid MethodParameters method attribute length %u in class file",
2628 method_attribute_length, CHECK_NULL);
2629 }
2630 method_parameters_data = cfs->current();
2631 cfs->skip_u2_fast(method_parameters_length);
2632 cfs->skip_u2_fast(method_parameters_length);
2633 // ignore this attribute if it cannot be reflected
2634 if (!SystemDictionary::Parameter_klass_loaded())
2635 method_parameters_length = -1;
2636 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2637 if (method_attribute_length != 0) {
2638 classfile_parse_error(
2639 "Invalid Synthetic method attribute length %u in class file %s",
2640 method_attribute_length, CHECK_NULL);
2641 }
2642 // Should we check that there hasn't already been a synthetic attribute?
2643 access_flags.set_is_synthetic();
2644 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2645 if (method_attribute_length != 0) {
2646 classfile_parse_error(
2647 "Invalid Deprecated method attribute length %u in class file %s",
2648 method_attribute_length, CHECK_NULL);
2649 }
2650 } else if (_major_version >= JAVA_1_5_VERSION) {
2651 if (method_attribute_name == vmSymbols::tag_signature()) {
2652 if (generic_signature_index != 0) {
2653 classfile_parse_error(
2654 "Multiple Signature attributes for method in class file %s",
2655 CHECK_NULL);
2656 }
2657 if (method_attribute_length != 2) {
2658 classfile_parse_error(
2659 "Invalid Signature attribute length %u in class file %s",
2660 method_attribute_length, CHECK_NULL);
2661 }
2662 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2663 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2664 if (runtime_visible_annotations != NULL) {
2665 classfile_parse_error(
2666 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2667 CHECK_NULL);
2668 }
2669 runtime_visible_annotations_length = method_attribute_length;
2670 runtime_visible_annotations = cfs->current();
2671 assert(runtime_visible_annotations != NULL, "null visible annotations");
2672 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2673 parse_annotations(cp,
2674 runtime_visible_annotations,
2675 runtime_visible_annotations_length,
2676 &parsed_annotations,
2677 _loader_data,
2678 CHECK_NULL);
2679 cfs->skip_u1_fast(runtime_visible_annotations_length);
2680 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2681 if (runtime_invisible_annotations_exists) {
2682 classfile_parse_error(
2683 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2684 CHECK_NULL);
2685 }
2686 runtime_invisible_annotations_exists = true;
2687 if (PreserveAllAnnotations) {
2688 runtime_invisible_annotations_length = method_attribute_length;
2689 runtime_invisible_annotations = cfs->current();
2690 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2691 }
2692 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2693 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2694 if (runtime_visible_parameter_annotations != NULL) {
2695 classfile_parse_error(
2696 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2697 CHECK_NULL);
2698 }
2699 runtime_visible_parameter_annotations_length = method_attribute_length;
2700 runtime_visible_parameter_annotations = cfs->current();
2701 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2702 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2703 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2704 if (runtime_invisible_parameter_annotations_exists) {
2705 classfile_parse_error(
2706 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2707 CHECK_NULL);
2708 }
2709 runtime_invisible_parameter_annotations_exists = true;
2710 if (PreserveAllAnnotations) {
2711 runtime_invisible_parameter_annotations_length = method_attribute_length;
2712 runtime_invisible_parameter_annotations = cfs->current();
2713 assert(runtime_invisible_parameter_annotations != NULL,
2714 "null invisible parameter annotations");
2715 }
2716 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2717 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2718 if (annotation_default != NULL) {
2719 classfile_parse_error(
2720 "Multiple AnnotationDefault attributes for method in class file %s",
2721 CHECK_NULL);
2722 }
2723 annotation_default_length = method_attribute_length;
2724 annotation_default = cfs->current();
2725 assert(annotation_default != NULL, "null annotation default");
2726 cfs->skip_u1(annotation_default_length, CHECK_NULL);
2727 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2728 if (runtime_visible_type_annotations != NULL) {
2729 classfile_parse_error(
2730 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2731 CHECK_NULL);
2732 }
2733 runtime_visible_type_annotations_length = method_attribute_length;
2734 runtime_visible_type_annotations = cfs->current();
2735 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2736 // No need for the VM to parse Type annotations
2737 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2738 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2739 if (runtime_invisible_type_annotations_exists) {
2740 classfile_parse_error(
2741 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2742 CHECK_NULL);
2743 } else {
2744 runtime_invisible_type_annotations_exists = true;
2745 }
2746 if (PreserveAllAnnotations) {
2747 runtime_invisible_type_annotations_length = method_attribute_length;
2748 runtime_invisible_type_annotations = cfs->current();
2749 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2750 }
2751 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2752 } else {
2753 // Skip unknown attributes
2754 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2755 }
2756 } else {
2757 // Skip unknown attributes
2758 cfs->skip_u1(method_attribute_length, CHECK_NULL);
2759 }
2760 }
2761
2762 if (linenumber_table != NULL) {
2763 linenumber_table->write_terminator();
2764 linenumber_table_length = linenumber_table->position();
2765 }
2766
2767 // Make sure there's at least one Code attribute in non-native/non-abstract method
2768 if (_need_verify) {
2769 guarantee_property(access_flags.is_native() ||
2770 access_flags.is_abstract() ||
2771 parsed_code_attribute,
2772 "Absent Code attribute in method that is not native or abstract in class file %s",
2773 CHECK_NULL);
2774 }
2775
2776 // All sizing information for a Method* is finally available, now create it
2777 InlineTableSizes sizes(
2778 total_lvt_length,
2779 linenumber_table_length,
2780 exception_table_length,
2781 checked_exceptions_length,
2782 method_parameters_length,
2783 generic_signature_index,
2784 runtime_visible_annotations_length +
2785 runtime_invisible_annotations_length,
2786 runtime_visible_parameter_annotations_length +
2787 runtime_invisible_parameter_annotations_length,
2788 runtime_visible_type_annotations_length +
2789 runtime_invisible_type_annotations_length,
2790 annotation_default_length,
2791 0);
2792
2793 Method* const m = Method::allocate(_loader_data,
2794 code_length,
2795 access_flags,
2796 &sizes,
2797 ConstMethod::NORMAL,
2798 CHECK_NULL);
2799
2800 ClassLoadingService::add_class_method_size(m->size()*wordSize);
2801
2802 // Fill in information from fixed part (access_flags already set)
2803 m->set_constants(_cp);
2804 m->set_name_index(name_index);
2805 m->set_signature_index(signature_index);
2806
2807 ResultTypeFinder rtf(cp->symbol_at(signature_index));
2808 m->constMethod()->set_result_type(rtf.type());
2809
2810 if (args_size >= 0) {
2811 m->set_size_of_parameters(args_size);
2812 } else {
2813 m->compute_size_of_parameters(THREAD);
2814 }
2815 #ifdef ASSERT
2816 if (args_size >= 0) {
2817 m->compute_size_of_parameters(THREAD);
2818 assert(args_size == m->size_of_parameters(), "");
2819 }
2820 #endif
2821
2822 // Fill in code attribute information
2823 m->set_max_stack(max_stack);
2824 m->set_max_locals(max_locals);
2825 if (stackmap_data != NULL) {
2826 m->constMethod()->copy_stackmap_data(_loader_data,
2827 (u1*)stackmap_data,
2828 stackmap_data_length,
2829 CHECK_NULL);
2830 }
2831
2832 // Copy byte codes
2833 m->set_code((u1*)code_start);
2834
2835 // Copy line number table
2836 if (linenumber_table != NULL) {
2837 memcpy(m->compressed_linenumber_table(),
2838 linenumber_table->buffer(),
2839 linenumber_table_length);
2840 }
2841
2842 // Copy exception table
2843 if (exception_table_length > 0) {
2844 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2845 m->exception_table_start(),
2846 exception_table_length * sizeof(ExceptionTableElement),
2847 sizeof(u2));
2848 }
2849
2850 // Copy method parameters
2851 if (method_parameters_length > 0) {
2852 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2853 for (int i = 0; i < method_parameters_length; i++) {
2854 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2855 method_parameters_data += 2;
2856 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2857 method_parameters_data += 2;
2858 }
2859 }
2860
2861 // Copy checked exceptions
2862 if (checked_exceptions_length > 0) {
2863 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2864 m->checked_exceptions_start(),
2865 checked_exceptions_length * sizeof(CheckedExceptionElement),
2866 sizeof(u2));
2867 }
2868
2869 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2870 if (total_lvt_length > 0) {
2871 promoted_flags->set_has_localvariable_table();
2872 copy_localvariable_table(m->constMethod(),
2873 lvt_cnt,
2874 localvariable_table_length,
2875 localvariable_table_start,
2876 lvtt_cnt,
2877 localvariable_type_table_length,
2878 localvariable_type_table_start,
2879 CHECK_NULL);
2880 }
2881
2882 if (parsed_annotations.has_any_annotations())
2883 parsed_annotations.apply_to(m);
2884
2885 // Copy annotations
2886 copy_method_annotations(m->constMethod(),
2887 runtime_visible_annotations,
2888 runtime_visible_annotations_length,
2889 runtime_invisible_annotations,
2890 runtime_invisible_annotations_length,
2891 runtime_visible_parameter_annotations,
2892 runtime_visible_parameter_annotations_length,
2893 runtime_invisible_parameter_annotations,
2894 runtime_invisible_parameter_annotations_length,
2895 runtime_visible_type_annotations,
2896 runtime_visible_type_annotations_length,
2897 runtime_invisible_type_annotations,
2898 runtime_invisible_type_annotations_length,
2899 annotation_default,
2900 annotation_default_length,
2901 CHECK_NULL);
2902
2903 if (name == vmSymbols::finalize_method_name() &&
2904 signature == vmSymbols::void_method_signature()) {
2905 if (m->is_empty_method()) {
2906 _has_empty_finalizer = true;
2907 } else {
2908 _has_finalizer = true;
2909 }
2910 }
2911 if (name == vmSymbols::object_initializer_name() &&
2912 signature == vmSymbols::void_method_signature() &&
2913 m->is_vanilla_constructor()) {
2914 _has_vanilla_constructor = true;
2915 }
2916
2917 NOT_PRODUCT(m->verify());
2918 return m;
2919 }
2920
2921
2922 // The promoted_flags parameter is used to pass relevant access_flags
2923 // from the methods back up to the containing klass. These flag values
2924 // are added to klass's access_flags.
2925 // Side-effects: populates the _methods field in the parser
parse_methods(const ClassFileStream * const cfs,bool is_interface,AccessFlags * promoted_flags,bool * has_final_method,bool * declares_nonstatic_concrete_methods,TRAPS)2926 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2927 bool is_interface,
2928 AccessFlags* promoted_flags,
2929 bool* has_final_method,
2930 bool* declares_nonstatic_concrete_methods,
2931 TRAPS) {
2932 assert(cfs != NULL, "invariant");
2933 assert(promoted_flags != NULL, "invariant");
2934 assert(has_final_method != NULL, "invariant");
2935 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2936
2937 assert(NULL == _methods, "invariant");
2938
2939 cfs->guarantee_more(2, CHECK); // length
2940 const u2 length = cfs->get_u2_fast();
2941 if (length == 0) {
2942 _methods = Universe::the_empty_method_array();
2943 } else {
2944 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2945 length,
2946 NULL,
2947 CHECK);
2948
2949 for (int index = 0; index < length; index++) {
2950 Method* method = parse_method(cfs,
2951 is_interface,
2952 _cp,
2953 promoted_flags,
2954 CHECK);
2955
2956 if (method->is_final()) {
2957 *has_final_method = true;
2958 }
2959 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2960 // used for interface initialization, and default method inheritance analysis
2961 if (is_interface && !(*declares_nonstatic_concrete_methods)
2962 && !method->is_abstract() && !method->is_static()) {
2963 *declares_nonstatic_concrete_methods = true;
2964 }
2965 _methods->at_put(index, method);
2966 }
2967
2968 if (_need_verify && length > 1) {
2969 // Check duplicated methods
2970 ResourceMark rm(THREAD);
2971 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2972 THREAD, NameSigHash*, HASH_ROW_SIZE);
2973 initialize_hashtable(names_and_sigs);
2974 bool dup = false;
2975 const Symbol* name = NULL;
2976 const Symbol* sig = NULL;
2977 {
2978 debug_only(NoSafepointVerifier nsv;)
2979 for (int i = 0; i < length; i++) {
2980 const Method* const m = _methods->at(i);
2981 name = m->name();
2982 sig = m->signature();
2983 // If no duplicates, add name/signature in hashtable names_and_sigs.
2984 if (!put_after_lookup(name, sig, names_and_sigs)) {
2985 dup = true;
2986 break;
2987 }
2988 }
2989 }
2990 if (dup) {
2991 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2992 name->as_C_string(), sig->as_klass_external_name(), CHECK);
2993 }
2994 }
2995 }
2996 }
2997
sort_methods(Array<Method * > * methods)2998 static const intArray* sort_methods(Array<Method*>* methods) {
2999 const int length = methods->length();
3000 // If JVMTI original method ordering or sharing is enabled we have to
3001 // remember the original class file ordering.
3002 // We temporarily use the vtable_index field in the Method* to store the
3003 // class file index, so we can read in after calling qsort.
3004 // Put the method ordering in the shared archive.
3005 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3006 for (int index = 0; index < length; index++) {
3007 Method* const m = methods->at(index);
3008 assert(!m->valid_vtable_index(), "vtable index should not be set");
3009 m->set_vtable_index(index);
3010 }
3011 }
3012 // Sort method array by ascending method name (for faster lookups & vtable construction)
3013 // Note that the ordering is not alphabetical, see Symbol::fast_compare
3014 Method::sort_methods(methods);
3015
3016 intArray* method_ordering = NULL;
3017 // If JVMTI original method ordering or sharing is enabled construct int
3018 // array remembering the original ordering
3019 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
3020 method_ordering = new intArray(length, length, -1);
3021 for (int index = 0; index < length; index++) {
3022 Method* const m = methods->at(index);
3023 const int old_index = m->vtable_index();
3024 assert(old_index >= 0 && old_index < length, "invalid method index");
3025 method_ordering->at_put(index, old_index);
3026 m->set_vtable_index(Method::invalid_vtable_index);
3027 }
3028 }
3029 return method_ordering;
3030 }
3031
3032 // Parse generic_signature attribute for methods and fields
parse_generic_signature_attribute(const ClassFileStream * const cfs,TRAPS)3033 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3034 TRAPS) {
3035 assert(cfs != NULL, "invariant");
3036
3037 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
3038 const u2 generic_signature_index = cfs->get_u2_fast();
3039 check_property(
3040 valid_symbol_at(generic_signature_index),
3041 "Invalid Signature attribute at constant pool index %u in class file %s",
3042 generic_signature_index, CHECK_0);
3043 return generic_signature_index;
3044 }
3045
parse_classfile_sourcefile_attribute(const ClassFileStream * const cfs,TRAPS)3046 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3047 TRAPS) {
3048
3049 assert(cfs != NULL, "invariant");
3050
3051 cfs->guarantee_more(2, CHECK); // sourcefile_index
3052 const u2 sourcefile_index = cfs->get_u2_fast();
3053 check_property(
3054 valid_symbol_at(sourcefile_index),
3055 "Invalid SourceFile attribute at constant pool index %u in class file %s",
3056 sourcefile_index, CHECK);
3057 set_class_sourcefile_index(sourcefile_index);
3058 }
3059
parse_classfile_source_debug_extension_attribute(const ClassFileStream * const cfs,int length,TRAPS)3060 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3061 int length,
3062 TRAPS) {
3063 assert(cfs != NULL, "invariant");
3064
3065 const u1* const sde_buffer = cfs->current();
3066 assert(sde_buffer != NULL, "null sde buffer");
3067
3068 // Don't bother storing it if there is no way to retrieve it
3069 if (JvmtiExport::can_get_source_debug_extension()) {
3070 assert((length+1) > length, "Overflow checking");
3071 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3072 for (int i = 0; i < length; i++) {
3073 sde[i] = sde_buffer[i];
3074 }
3075 sde[length] = '\0';
3076 set_class_sde_buffer((const char*)sde, length);
3077 }
3078 // Got utf8 string, set stream position forward
3079 cfs->skip_u1(length, CHECK);
3080 }
3081
3082
3083 // Inner classes can be static, private or protected (classic VM does this)
3084 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3085 JVM_ACC_PRIVATE | \
3086 JVM_ACC_PROTECTED | \
3087 JVM_ACC_STATIC \
3088 )
3089
3090 // Find index of the InnerClasses entry for the specified inner_class_info_index.
3091 // Return -1 if none is found.
inner_classes_find_index(const Array<u2> * inner_classes,int inner,const ConstantPool * cp,int length)3092 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
3093 Symbol* cp_klass_name = cp->klass_name_at(inner);
3094 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
3095 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
3096 if (cp->klass_name_at(idx_inner) == cp_klass_name) {
3097 return idx;
3098 }
3099 }
3100 return -1;
3101 }
3102
3103 // Return the outer_class_info_index for the InnerClasses entry containing the
3104 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found.
inner_classes_jump_to_outer(const Array<u2> * inner_classes,int inner,const ConstantPool * cp,int length)3105 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
3106 if (inner == 0) return -1;
3107 int idx = inner_classes_find_index(inner_classes, inner, cp, length);
3108 if (idx == -1) return -1;
3109 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
3110 return result;
3111 }
3112
3113 // Return true if circularity is found, false if no circularity is found.
3114 // Use Floyd's cycle finding algorithm.
inner_classes_check_loop_through_outer(const Array<u2> * inner_classes,int idx,const ConstantPool * cp,int length)3115 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
3116 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
3117 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
3118 while (fast != -1 && fast != 0) {
3119 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
3120 return true; // found a circularity
3121 }
3122 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3123 if (fast == -1) return false;
3124 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3125 if (fast == -1) return false;
3126 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
3127 assert(slow != -1, "sanity check");
3128 }
3129 return false;
3130 }
3131
3132 // Loop through each InnerClasses entry checking for circularities and duplications
3133 // with other entries. If duplicate entries are found then throw CFE. Otherwise,
3134 // return true if a circularity or entries with duplicate inner_class_info_indexes
3135 // are found.
check_inner_classes_circularity(const ConstantPool * cp,int length,TRAPS)3136 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
3137 // Loop through each InnerClasses entry.
3138 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
3139 // Return true if there are circular entries.
3140 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
3141 return true;
3142 }
3143 // Check if there are duplicate entries or entries with the same inner_class_info_index.
3144 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
3145 y += InstanceKlass::inner_class_next_offset) {
3146
3147 // To maintain compatibility, throw an exception if duplicate inner classes
3148 // entries are found.
3149 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
3150 _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
3151 _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
3152 _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
3153 "Duplicate entry in InnerClasses attribute in class file %s",
3154 CHECK_(true));
3155 // Return true if there are two entries with the same inner_class_info_index.
3156 if (_inner_classes->at(y) == _inner_classes->at(idx)) {
3157 return true;
3158 }
3159 }
3160 }
3161 return false;
3162 }
3163
3164 // Return number of classes in the inner classes attribute table
parse_classfile_inner_classes_attribute(const ClassFileStream * const cfs,const ConstantPool * cp,const u1 * const inner_classes_attribute_start,bool parsed_enclosingmethod_attribute,u2 enclosing_method_class_index,u2 enclosing_method_method_index,TRAPS)3165 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3166 const ConstantPool* cp,
3167 const u1* const inner_classes_attribute_start,
3168 bool parsed_enclosingmethod_attribute,
3169 u2 enclosing_method_class_index,
3170 u2 enclosing_method_method_index,
3171 TRAPS) {
3172 const u1* const current_mark = cfs->current();
3173 u2 length = 0;
3174 if (inner_classes_attribute_start != NULL) {
3175 cfs->set_current(inner_classes_attribute_start);
3176 cfs->guarantee_more(2, CHECK_0); // length
3177 length = cfs->get_u2_fast();
3178 }
3179
3180 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3181 // method data:
3182 // [inner_class_info_index,
3183 // outer_class_info_index,
3184 // inner_name_index,
3185 // inner_class_access_flags,
3186 // ...
3187 // enclosing_method_class_index,
3188 // enclosing_method_method_index]
3189 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3190 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3191 _inner_classes = inner_classes;
3192
3193 int index = 0;
3194 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
3195 for (int n = 0; n < length; n++) {
3196 // Inner class index
3197 const u2 inner_class_info_index = cfs->get_u2_fast();
3198 check_property(
3199 valid_klass_reference_at(inner_class_info_index),
3200 "inner_class_info_index %u has bad constant type in class file %s",
3201 inner_class_info_index, CHECK_0);
3202 // Outer class index
3203 const u2 outer_class_info_index = cfs->get_u2_fast();
3204 check_property(
3205 outer_class_info_index == 0 ||
3206 valid_klass_reference_at(outer_class_info_index),
3207 "outer_class_info_index %u has bad constant type in class file %s",
3208 outer_class_info_index, CHECK_0);
3209
3210 if (outer_class_info_index != 0) {
3211 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3212 char* bytes = (char*)outer_class_name->bytes();
3213 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3214 "Outer class is an array class in class file %s", CHECK_0);
3215 }
3216 // Inner class name
3217 const u2 inner_name_index = cfs->get_u2_fast();
3218 check_property(
3219 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3220 "inner_name_index %u has bad constant type in class file %s",
3221 inner_name_index, CHECK_0);
3222 if (_need_verify) {
3223 guarantee_property(inner_class_info_index != outer_class_info_index,
3224 "Class is both outer and inner class in class file %s", CHECK_0);
3225 }
3226 // Access flags
3227 jint flags;
3228 // JVM_ACC_MODULE is defined in JDK-9 and later.
3229 if (_major_version >= JAVA_9_VERSION) {
3230 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3231 } else {
3232 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3233 }
3234 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3235 // Set abstract bit for old class files for backward compatibility
3236 flags |= JVM_ACC_ABSTRACT;
3237 }
3238 verify_legal_class_modifiers(flags, CHECK_0);
3239 AccessFlags inner_access_flags(flags);
3240
3241 inner_classes->at_put(index++, inner_class_info_index);
3242 inner_classes->at_put(index++, outer_class_info_index);
3243 inner_classes->at_put(index++, inner_name_index);
3244 inner_classes->at_put(index++, inner_access_flags.as_short());
3245 }
3246
3247 // 4347400: make sure there's no duplicate entry in the classes array
3248 // Also, check for circular entries.
3249 bool has_circularity = false;
3250 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3251 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3252 if (has_circularity) {
3253 // If circularity check failed then ignore InnerClasses attribute.
3254 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3255 index = 0;
3256 if (parsed_enclosingmethod_attribute) {
3257 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3258 _inner_classes = inner_classes;
3259 } else {
3260 _inner_classes = Universe::the_empty_short_array();
3261 }
3262 }
3263 }
3264 // Set EnclosingMethod class and method indexes.
3265 if (parsed_enclosingmethod_attribute) {
3266 inner_classes->at_put(index++, enclosing_method_class_index);
3267 inner_classes->at_put(index++, enclosing_method_method_index);
3268 }
3269 assert(index == size || has_circularity, "wrong size");
3270
3271 // Restore buffer's current position.
3272 cfs->set_current(current_mark);
3273
3274 return length;
3275 }
3276
parse_classfile_nest_members_attribute(const ClassFileStream * const cfs,const u1 * const nest_members_attribute_start,TRAPS)3277 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3278 const u1* const nest_members_attribute_start,
3279 TRAPS) {
3280 const u1* const current_mark = cfs->current();
3281 u2 length = 0;
3282 if (nest_members_attribute_start != NULL) {
3283 cfs->set_current(nest_members_attribute_start);
3284 cfs->guarantee_more(2, CHECK_0); // length
3285 length = cfs->get_u2_fast();
3286 }
3287 const int size = length;
3288 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3289 _nest_members = nest_members;
3290
3291 int index = 0;
3292 cfs->guarantee_more(2 * length, CHECK_0);
3293 for (int n = 0; n < length; n++) {
3294 const u2 class_info_index = cfs->get_u2_fast();
3295 check_property(
3296 valid_klass_reference_at(class_info_index),
3297 "Nest member class_info_index %u has bad constant type in class file %s",
3298 class_info_index, CHECK_0);
3299 nest_members->at_put(index++, class_info_index);
3300 }
3301 assert(index == size, "wrong size");
3302
3303 // Restore buffer's current position.
3304 cfs->set_current(current_mark);
3305
3306 return length;
3307 }
3308
parse_classfile_synthetic_attribute(TRAPS)3309 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3310 set_class_synthetic_flag(true);
3311 }
3312
parse_classfile_signature_attribute(const ClassFileStream * const cfs,TRAPS)3313 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3314 assert(cfs != NULL, "invariant");
3315
3316 const u2 signature_index = cfs->get_u2(CHECK);
3317 check_property(
3318 valid_symbol_at(signature_index),
3319 "Invalid constant pool index %u in Signature attribute in class file %s",
3320 signature_index, CHECK);
3321 set_class_generic_signature_index(signature_index);
3322 }
3323
parse_classfile_bootstrap_methods_attribute(const ClassFileStream * const cfs,ConstantPool * cp,u4 attribute_byte_length,TRAPS)3324 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3325 ConstantPool* cp,
3326 u4 attribute_byte_length,
3327 TRAPS) {
3328 assert(cfs != NULL, "invariant");
3329 assert(cp != NULL, "invariant");
3330
3331 const u1* const current_start = cfs->current();
3332
3333 guarantee_property(attribute_byte_length >= sizeof(u2),
3334 "Invalid BootstrapMethods attribute length %u in class file %s",
3335 attribute_byte_length,
3336 CHECK);
3337
3338 cfs->guarantee_more(attribute_byte_length, CHECK);
3339
3340 const int attribute_array_length = cfs->get_u2_fast();
3341
3342 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3343 "Short length on BootstrapMethods in class file %s",
3344 CHECK);
3345
3346
3347 // The attribute contains a counted array of counted tuples of shorts,
3348 // represending bootstrap specifiers:
3349 // length*{bootstrap_method_index, argument_count*{argument_index}}
3350 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3351 // operand_count = number of shorts in attr, except for leading length
3352
3353 // The attribute is copied into a short[] array.
3354 // The array begins with a series of short[2] pairs, one for each tuple.
3355 const int index_size = (attribute_array_length * 2);
3356
3357 Array<u2>* const operands =
3358 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3359
3360 // Eagerly assign operands so they will be deallocated with the constant
3361 // pool if there is an error.
3362 cp->set_operands(operands);
3363
3364 int operand_fill_index = index_size;
3365 const int cp_size = cp->length();
3366
3367 for (int n = 0; n < attribute_array_length; n++) {
3368 // Store a 32-bit offset into the header of the operand array.
3369 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3370
3371 // Read a bootstrap specifier.
3372 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
3373 const u2 bootstrap_method_index = cfs->get_u2_fast();
3374 const u2 argument_count = cfs->get_u2_fast();
3375 check_property(
3376 valid_cp_range(bootstrap_method_index, cp_size) &&
3377 cp->tag_at(bootstrap_method_index).is_method_handle(),
3378 "bootstrap_method_index %u has bad constant type in class file %s",
3379 bootstrap_method_index,
3380 CHECK);
3381
3382 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3383 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3384 CHECK);
3385
3386 operands->at_put(operand_fill_index++, bootstrap_method_index);
3387 operands->at_put(operand_fill_index++, argument_count);
3388
3389 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
3390 for (int j = 0; j < argument_count; j++) {
3391 const u2 argument_index = cfs->get_u2_fast();
3392 check_property(
3393 valid_cp_range(argument_index, cp_size) &&
3394 cp->tag_at(argument_index).is_loadable_constant(),
3395 "argument_index %u has bad constant type in class file %s",
3396 argument_index,
3397 CHECK);
3398 operands->at_put(operand_fill_index++, argument_index);
3399 }
3400 }
3401 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3402 "Bad length on BootstrapMethods in class file %s",
3403 CHECK);
3404 }
3405
parse_classfile_attributes(const ClassFileStream * const cfs,ConstantPool * cp,ClassFileParser::ClassAnnotationCollector * parsed_annotations,TRAPS)3406 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3407 ConstantPool* cp,
3408 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3409 TRAPS) {
3410 assert(cfs != NULL, "invariant");
3411 assert(cp != NULL, "invariant");
3412 assert(parsed_annotations != NULL, "invariant");
3413
3414 // Set inner classes attribute to default sentinel
3415 _inner_classes = Universe::the_empty_short_array();
3416 // Set nest members attribute to default sentinel
3417 _nest_members = Universe::the_empty_short_array();
3418 cfs->guarantee_more(2, CHECK); // attributes_count
3419 u2 attributes_count = cfs->get_u2_fast();
3420 bool parsed_sourcefile_attribute = false;
3421 bool parsed_innerclasses_attribute = false;
3422 bool parsed_nest_members_attribute = false;
3423 bool parsed_nest_host_attribute = false;
3424 bool parsed_enclosingmethod_attribute = false;
3425 bool parsed_bootstrap_methods_attribute = false;
3426 const u1* runtime_visible_annotations = NULL;
3427 int runtime_visible_annotations_length = 0;
3428 const u1* runtime_invisible_annotations = NULL;
3429 int runtime_invisible_annotations_length = 0;
3430 const u1* runtime_visible_type_annotations = NULL;
3431 int runtime_visible_type_annotations_length = 0;
3432 const u1* runtime_invisible_type_annotations = NULL;
3433 int runtime_invisible_type_annotations_length = 0;
3434 bool runtime_invisible_type_annotations_exists = false;
3435 bool runtime_invisible_annotations_exists = false;
3436 bool parsed_source_debug_ext_annotations_exist = false;
3437 const u1* inner_classes_attribute_start = NULL;
3438 u4 inner_classes_attribute_length = 0;
3439 u2 enclosing_method_class_index = 0;
3440 u2 enclosing_method_method_index = 0;
3441 const u1* nest_members_attribute_start = NULL;
3442 u4 nest_members_attribute_length = 0;
3443
3444 // Iterate over attributes
3445 while (attributes_count--) {
3446 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3447 const u2 attribute_name_index = cfs->get_u2_fast();
3448 const u4 attribute_length = cfs->get_u4_fast();
3449 check_property(
3450 valid_symbol_at(attribute_name_index),
3451 "Attribute name has bad constant pool index %u in class file %s",
3452 attribute_name_index, CHECK);
3453 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3454 if (tag == vmSymbols::tag_source_file()) {
3455 // Check for SourceFile tag
3456 if (_need_verify) {
3457 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3458 }
3459 if (parsed_sourcefile_attribute) {
3460 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3461 } else {
3462 parsed_sourcefile_attribute = true;
3463 }
3464 parse_classfile_sourcefile_attribute(cfs, CHECK);
3465 } else if (tag == vmSymbols::tag_source_debug_extension()) {
3466 // Check for SourceDebugExtension tag
3467 if (parsed_source_debug_ext_annotations_exist) {
3468 classfile_parse_error(
3469 "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3470 }
3471 parsed_source_debug_ext_annotations_exist = true;
3472 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3473 } else if (tag == vmSymbols::tag_inner_classes()) {
3474 // Check for InnerClasses tag
3475 if (parsed_innerclasses_attribute) {
3476 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3477 } else {
3478 parsed_innerclasses_attribute = true;
3479 }
3480 inner_classes_attribute_start = cfs->current();
3481 inner_classes_attribute_length = attribute_length;
3482 cfs->skip_u1(inner_classes_attribute_length, CHECK);
3483 } else if (tag == vmSymbols::tag_synthetic()) {
3484 // Check for Synthetic tag
3485 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3486 if (attribute_length != 0) {
3487 classfile_parse_error(
3488 "Invalid Synthetic classfile attribute length %u in class file %s",
3489 attribute_length, CHECK);
3490 }
3491 parse_classfile_synthetic_attribute(CHECK);
3492 } else if (tag == vmSymbols::tag_deprecated()) {
3493 // Check for Deprecatd tag - 4276120
3494 if (attribute_length != 0) {
3495 classfile_parse_error(
3496 "Invalid Deprecated classfile attribute length %u in class file %s",
3497 attribute_length, CHECK);
3498 }
3499 } else if (_major_version >= JAVA_1_5_VERSION) {
3500 if (tag == vmSymbols::tag_signature()) {
3501 if (_generic_signature_index != 0) {
3502 classfile_parse_error(
3503 "Multiple Signature attributes in class file %s", CHECK);
3504 }
3505 if (attribute_length != 2) {
3506 classfile_parse_error(
3507 "Wrong Signature attribute length %u in class file %s",
3508 attribute_length, CHECK);
3509 }
3510 parse_classfile_signature_attribute(cfs, CHECK);
3511 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3512 if (runtime_visible_annotations != NULL) {
3513 classfile_parse_error(
3514 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3515 }
3516 runtime_visible_annotations_length = attribute_length;
3517 runtime_visible_annotations = cfs->current();
3518 assert(runtime_visible_annotations != NULL, "null visible annotations");
3519 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3520 parse_annotations(cp,
3521 runtime_visible_annotations,
3522 runtime_visible_annotations_length,
3523 parsed_annotations,
3524 _loader_data,
3525 CHECK);
3526 cfs->skip_u1_fast(runtime_visible_annotations_length);
3527 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3528 if (runtime_invisible_annotations_exists) {
3529 classfile_parse_error(
3530 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3531 }
3532 runtime_invisible_annotations_exists = true;
3533 if (PreserveAllAnnotations) {
3534 runtime_invisible_annotations_length = attribute_length;
3535 runtime_invisible_annotations = cfs->current();
3536 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3537 }
3538 cfs->skip_u1(attribute_length, CHECK);
3539 } else if (tag == vmSymbols::tag_enclosing_method()) {
3540 if (parsed_enclosingmethod_attribute) {
3541 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3542 } else {
3543 parsed_enclosingmethod_attribute = true;
3544 }
3545 guarantee_property(attribute_length == 4,
3546 "Wrong EnclosingMethod attribute length %u in class file %s",
3547 attribute_length, CHECK);
3548 cfs->guarantee_more(4, CHECK); // class_index, method_index
3549 enclosing_method_class_index = cfs->get_u2_fast();
3550 enclosing_method_method_index = cfs->get_u2_fast();
3551 if (enclosing_method_class_index == 0) {
3552 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3553 }
3554 // Validate the constant pool indices and types
3555 check_property(valid_klass_reference_at(enclosing_method_class_index),
3556 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3557 if (enclosing_method_method_index != 0 &&
3558 (!cp->is_within_bounds(enclosing_method_method_index) ||
3559 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3560 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3561 }
3562 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3563 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3564 if (parsed_bootstrap_methods_attribute) {
3565 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3566 }
3567 parsed_bootstrap_methods_attribute = true;
3568 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3569 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3570 if (runtime_visible_type_annotations != NULL) {
3571 classfile_parse_error(
3572 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3573 }
3574 runtime_visible_type_annotations_length = attribute_length;
3575 runtime_visible_type_annotations = cfs->current();
3576 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3577 // No need for the VM to parse Type annotations
3578 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3579 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3580 if (runtime_invisible_type_annotations_exists) {
3581 classfile_parse_error(
3582 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3583 } else {
3584 runtime_invisible_type_annotations_exists = true;
3585 }
3586 if (PreserveAllAnnotations) {
3587 runtime_invisible_type_annotations_length = attribute_length;
3588 runtime_invisible_type_annotations = cfs->current();
3589 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3590 }
3591 cfs->skip_u1(attribute_length, CHECK);
3592 } else if (_major_version >= JAVA_11_VERSION) {
3593 if (tag == vmSymbols::tag_nest_members()) {
3594 // Check for NestMembers tag
3595 if (parsed_nest_members_attribute) {
3596 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK);
3597 } else {
3598 parsed_nest_members_attribute = true;
3599 }
3600 if (parsed_nest_host_attribute) {
3601 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK);
3602 }
3603 nest_members_attribute_start = cfs->current();
3604 nest_members_attribute_length = attribute_length;
3605 cfs->skip_u1(nest_members_attribute_length, CHECK);
3606 } else if (tag == vmSymbols::tag_nest_host()) {
3607 if (parsed_nest_host_attribute) {
3608 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK);
3609 } else {
3610 parsed_nest_host_attribute = true;
3611 }
3612 if (parsed_nest_members_attribute) {
3613 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK);
3614 }
3615 if (_need_verify) {
3616 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3617 }
3618 cfs->guarantee_more(2, CHECK);
3619 u2 class_info_index = cfs->get_u2_fast();
3620 check_property(
3621 valid_klass_reference_at(class_info_index),
3622 "Nest-host class_info_index %u has bad constant type in class file %s",
3623 class_info_index, CHECK);
3624 _nest_host = class_info_index;
3625 } else {
3626 // Unknown attribute
3627 cfs->skip_u1(attribute_length, CHECK);
3628 }
3629 } else {
3630 // Unknown attribute
3631 cfs->skip_u1(attribute_length, CHECK);
3632 }
3633 } else {
3634 // Unknown attribute
3635 cfs->skip_u1(attribute_length, CHECK);
3636 }
3637 }
3638 _annotations = assemble_annotations(runtime_visible_annotations,
3639 runtime_visible_annotations_length,
3640 runtime_invisible_annotations,
3641 runtime_invisible_annotations_length,
3642 CHECK);
3643 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3644 runtime_visible_type_annotations_length,
3645 runtime_invisible_type_annotations,
3646 runtime_invisible_type_annotations_length,
3647 CHECK);
3648
3649 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3650 const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3651 cfs,
3652 cp,
3653 inner_classes_attribute_start,
3654 parsed_innerclasses_attribute,
3655 enclosing_method_class_index,
3656 enclosing_method_method_index,
3657 CHECK);
3658 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3659 guarantee_property(
3660 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3661 "Wrong InnerClasses attribute length in class file %s", CHECK);
3662 }
3663 }
3664
3665 if (parsed_nest_members_attribute) {
3666 const u2 num_of_classes = parse_classfile_nest_members_attribute(
3667 cfs,
3668 nest_members_attribute_start,
3669 CHECK);
3670 if (_need_verify) {
3671 guarantee_property(
3672 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3673 "Wrong NestMembers attribute length in class file %s", CHECK);
3674 }
3675 }
3676
3677 if (_max_bootstrap_specifier_index >= 0) {
3678 guarantee_property(parsed_bootstrap_methods_attribute,
3679 "Missing BootstrapMethods attribute in class file %s", CHECK);
3680 }
3681 }
3682
apply_parsed_class_attributes(InstanceKlass * k)3683 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3684 assert(k != NULL, "invariant");
3685
3686 if (_synthetic_flag)
3687 k->set_is_synthetic();
3688 if (_sourcefile_index != 0) {
3689 k->set_source_file_name_index(_sourcefile_index);
3690 }
3691 if (_generic_signature_index != 0) {
3692 k->set_generic_signature_index(_generic_signature_index);
3693 }
3694 if (_sde_buffer != NULL) {
3695 k->set_source_debug_extension(_sde_buffer, _sde_length);
3696 }
3697 }
3698
3699 // Create the Annotations object that will
3700 // hold the annotations array for the Klass.
create_combined_annotations(TRAPS)3701 void ClassFileParser::create_combined_annotations(TRAPS) {
3702 if (_annotations == NULL &&
3703 _type_annotations == NULL &&
3704 _fields_annotations == NULL &&
3705 _fields_type_annotations == NULL) {
3706 // Don't create the Annotations object unnecessarily.
3707 return;
3708 }
3709
3710 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3711 annotations->set_class_annotations(_annotations);
3712 annotations->set_class_type_annotations(_type_annotations);
3713 annotations->set_fields_annotations(_fields_annotations);
3714 annotations->set_fields_type_annotations(_fields_type_annotations);
3715
3716 // This is the Annotations object that will be
3717 // assigned to InstanceKlass being constructed.
3718 _combined_annotations = annotations;
3719
3720 // The annotations arrays below has been transfered the
3721 // _combined_annotations so these fields can now be cleared.
3722 _annotations = NULL;
3723 _type_annotations = NULL;
3724 _fields_annotations = NULL;
3725 _fields_type_annotations = NULL;
3726 }
3727
3728 // Transfer ownership of metadata allocated to the InstanceKlass.
apply_parsed_class_metadata(InstanceKlass * this_klass,int java_fields_count,TRAPS)3729 void ClassFileParser::apply_parsed_class_metadata(
3730 InstanceKlass* this_klass,
3731 int java_fields_count, TRAPS) {
3732 assert(this_klass != NULL, "invariant");
3733
3734 _cp->set_pool_holder(this_klass);
3735 this_klass->set_constants(_cp);
3736 this_klass->set_fields(_fields, java_fields_count);
3737 this_klass->set_methods(_methods);
3738 this_klass->set_inner_classes(_inner_classes);
3739 this_klass->set_nest_members(_nest_members);
3740 this_klass->set_nest_host_index(_nest_host);
3741 this_klass->set_local_interfaces(_local_interfaces);
3742 this_klass->set_annotations(_combined_annotations);
3743 // Delay the setting of _transitive_interfaces until after initialize_supers() in
3744 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with
3745 // its _super. If an OOM occurs while loading the current klass, its _super field
3746 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3747 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3748 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3749
3750 // Clear out these fields so they don't get deallocated by the destructor
3751 clear_class_metadata();
3752 }
3753
assemble_annotations(const u1 * const runtime_visible_annotations,int runtime_visible_annotations_length,const u1 * const runtime_invisible_annotations,int runtime_invisible_annotations_length,TRAPS)3754 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3755 int runtime_visible_annotations_length,
3756 const u1* const runtime_invisible_annotations,
3757 int runtime_invisible_annotations_length,
3758 TRAPS) {
3759 AnnotationArray* annotations = NULL;
3760 if (runtime_visible_annotations != NULL ||
3761 runtime_invisible_annotations != NULL) {
3762 annotations = MetadataFactory::new_array<u1>(_loader_data,
3763 runtime_visible_annotations_length +
3764 runtime_invisible_annotations_length,
3765 CHECK_(annotations));
3766 if (runtime_visible_annotations != NULL) {
3767 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3768 annotations->at_put(i, runtime_visible_annotations[i]);
3769 }
3770 }
3771 if (runtime_invisible_annotations != NULL) {
3772 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3773 int append = runtime_visible_annotations_length+i;
3774 annotations->at_put(append, runtime_invisible_annotations[i]);
3775 }
3776 }
3777 }
3778 return annotations;
3779 }
3780
parse_super_class(ConstantPool * const cp,const int super_class_index,const bool need_verify,TRAPS)3781 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3782 const int super_class_index,
3783 const bool need_verify,
3784 TRAPS) {
3785 assert(cp != NULL, "invariant");
3786 const InstanceKlass* super_klass = NULL;
3787
3788 if (super_class_index == 0) {
3789 check_property(_class_name == vmSymbols::java_lang_Object(),
3790 "Invalid superclass index %u in class file %s",
3791 super_class_index,
3792 CHECK_NULL);
3793 } else {
3794 check_property(valid_klass_reference_at(super_class_index),
3795 "Invalid superclass index %u in class file %s",
3796 super_class_index,
3797 CHECK_NULL);
3798 // The class name should be legal because it is checked when parsing constant pool.
3799 // However, make sure it is not an array type.
3800 bool is_array = false;
3801 if (cp->tag_at(super_class_index).is_klass()) {
3802 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3803 if (need_verify)
3804 is_array = super_klass->is_array_klass();
3805 } else if (need_verify) {
3806 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3807 }
3808 if (need_verify) {
3809 guarantee_property(!is_array,
3810 "Bad superclass name in class file %s", CHECK_NULL);
3811 }
3812 }
3813 return super_klass;
3814 }
3815
compute_oop_map_count(const InstanceKlass * super,unsigned int nonstatic_oop_map_count,int first_nonstatic_oop_offset)3816 static unsigned int compute_oop_map_count(const InstanceKlass* super,
3817 unsigned int nonstatic_oop_map_count,
3818 int first_nonstatic_oop_offset) {
3819
3820 unsigned int map_count =
3821 NULL == super ? 0 : super->nonstatic_oop_map_count();
3822 if (nonstatic_oop_map_count > 0) {
3823 // We have oops to add to map
3824 if (map_count == 0) {
3825 map_count = nonstatic_oop_map_count;
3826 }
3827 else {
3828 // Check whether we should add a new map block or whether the last one can
3829 // be extended
3830 const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3831 const OopMapBlock* const last_map = first_map + map_count - 1;
3832
3833 const int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3834 if (next_offset == first_nonstatic_oop_offset) {
3835 // There is no gap bettwen superklass's last oop field and first
3836 // local oop field, merge maps.
3837 nonstatic_oop_map_count -= 1;
3838 }
3839 else {
3840 // Superklass didn't end with a oop field, add extra maps
3841 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3842 }
3843 map_count += nonstatic_oop_map_count;
3844 }
3845 }
3846 return map_count;
3847 }
3848
3849 #ifndef PRODUCT
print_field_layout(const Symbol * name,Array<u2> * fields,const constantPoolHandle & cp,int instance_size,int instance_fields_start,int instance_fields_end,int static_fields_end)3850 static void print_field_layout(const Symbol* name,
3851 Array<u2>* fields,
3852 const constantPoolHandle& cp,
3853 int instance_size,
3854 int instance_fields_start,
3855 int instance_fields_end,
3856 int static_fields_end) {
3857
3858 assert(name != NULL, "invariant");
3859
3860 tty->print("%s: field layout\n", name->as_klass_external_name());
3861 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3862 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3863 if (!fs.access_flags().is_static()) {
3864 tty->print(" @%3d \"%s\" %s\n",
3865 fs.offset(),
3866 fs.name()->as_klass_external_name(),
3867 fs.signature()->as_klass_external_name());
3868 }
3869 }
3870 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3871 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3872 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3873 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3874 if (fs.access_flags().is_static()) {
3875 tty->print(" @%3d \"%s\" %s\n",
3876 fs.offset(),
3877 fs.name()->as_klass_external_name(),
3878 fs.signature()->as_klass_external_name());
3879 }
3880 }
3881 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3882 tty->print("\n");
3883 }
3884 #endif
3885
3886 // Values needed for oopmap and InstanceKlass creation
3887 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3888 public:
3889 int* nonstatic_oop_offsets;
3890 unsigned int* nonstatic_oop_counts;
3891 unsigned int nonstatic_oop_map_count;
3892 unsigned int total_oop_map_count;
3893 int instance_size;
3894 int nonstatic_field_size;
3895 int static_field_size;
3896 bool has_nonstatic_fields;
3897 };
3898
3899 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
layout_fields(ConstantPool * cp,const FieldAllocationCount * fac,const ClassAnnotationCollector * parsed_annotations,FieldLayoutInfo * info,TRAPS)3900 void ClassFileParser::layout_fields(ConstantPool* cp,
3901 const FieldAllocationCount* fac,
3902 const ClassAnnotationCollector* parsed_annotations,
3903 FieldLayoutInfo* info,
3904 TRAPS) {
3905
3906 assert(cp != NULL, "invariant");
3907
3908 // Field size and offset computation
3909 int nonstatic_field_size = _super_klass == NULL ? 0 :
3910 _super_klass->nonstatic_field_size();
3911
3912 // Count the contended fields by type.
3913 //
3914 // We ignore static fields, because @Contended is not supported for them.
3915 // The layout code below will also ignore the static fields.
3916 int nonstatic_contended_count = 0;
3917 FieldAllocationCount fac_contended;
3918 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3919 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3920 if (fs.is_contended()) {
3921 fac_contended.count[atype]++;
3922 if (!fs.access_flags().is_static()) {
3923 nonstatic_contended_count++;
3924 }
3925 }
3926 }
3927
3928
3929 // Calculate the starting byte offsets
3930 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3931 int next_static_double_offset = next_static_oop_offset +
3932 ((fac->count[STATIC_OOP]) * heapOopSize);
3933 if (fac->count[STATIC_DOUBLE]) {
3934 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
3935 }
3936
3937 int next_static_word_offset = next_static_double_offset +
3938 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3939 int next_static_short_offset = next_static_word_offset +
3940 ((fac->count[STATIC_WORD]) * BytesPerInt);
3941 int next_static_byte_offset = next_static_short_offset +
3942 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3943
3944 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3945 nonstatic_field_size * heapOopSize;
3946
3947 int next_nonstatic_field_offset = nonstatic_fields_start;
3948
3949 const bool is_contended_class = parsed_annotations->is_contended();
3950
3951 // Class is contended, pad before all the fields
3952 if (is_contended_class) {
3953 next_nonstatic_field_offset += ContendedPaddingWidth;
3954 }
3955
3956 // Compute the non-contended fields count.
3957 // The packing code below relies on these counts to determine if some field
3958 // can be squeezed into the alignment gap. Contended fields are obviously
3959 // exempt from that.
3960 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3961 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3962 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3963 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3964 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3965
3966 // Total non-static fields count, including every contended field
3967 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3968 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3969 fac->count[NONSTATIC_OOP];
3970
3971 const bool super_has_nonstatic_fields =
3972 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
3973 const bool has_nonstatic_fields =
3974 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3975
3976
3977 // Prepare list of oops for oop map generation.
3978 //
3979 // "offset" and "count" lists are describing the set of contiguous oop
3980 // regions. offset[i] is the start of the i-th region, which then has
3981 // count[i] oops following. Before we know how many regions are required,
3982 // we pessimistically allocate the maps to fit all the oops into the
3983 // distinct regions.
3984 //
3985 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3986 // to figure out if we still need to do this.
3987 unsigned int nonstatic_oop_map_count = 0;
3988 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3989
3990 int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3991 THREAD, int, max_nonstatic_oop_maps);
3992 unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3993 THREAD, unsigned int, max_nonstatic_oop_maps);
3994
3995 int first_nonstatic_oop_offset = 0; // will be set for first oop field
3996
3997 bool compact_fields = CompactFields;
3998 int allocation_style = FieldsAllocationStyle;
3999 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
4000 assert(false, "0 <= FieldsAllocationStyle <= 2");
4001 allocation_style = 1; // Optimistic
4002 }
4003
4004 // The next classes have predefined hard-coded fields offsets
4005 // (see in JavaClasses::compute_hard_coded_offsets()).
4006 // Use default fields allocation order for them.
4007 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
4008 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
4009 _class_name == vmSymbols::java_lang_Class() ||
4010 _class_name == vmSymbols::java_lang_ClassLoader() ||
4011 _class_name == vmSymbols::java_lang_ref_Reference() ||
4012 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
4013 _class_name == vmSymbols::java_lang_StackTraceElement() ||
4014 _class_name == vmSymbols::java_lang_String() ||
4015 _class_name == vmSymbols::java_lang_Throwable() ||
4016 _class_name == vmSymbols::java_lang_Boolean() ||
4017 _class_name == vmSymbols::java_lang_Character() ||
4018 _class_name == vmSymbols::java_lang_Float() ||
4019 _class_name == vmSymbols::java_lang_Double() ||
4020 _class_name == vmSymbols::java_lang_Byte() ||
4021 _class_name == vmSymbols::java_lang_Short() ||
4022 _class_name == vmSymbols::java_lang_Integer() ||
4023 _class_name == vmSymbols::java_lang_Long())) {
4024 allocation_style = 0; // Allocate oops first
4025 compact_fields = false; // Don't compact fields
4026 }
4027
4028 int next_nonstatic_oop_offset = 0;
4029 int next_nonstatic_double_offset = 0;
4030
4031 // Rearrange fields for a given allocation style
4032 if( allocation_style == 0 ) {
4033 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
4034 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4035 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4036 (nonstatic_oop_count * heapOopSize);
4037 } else if( allocation_style == 1 ) {
4038 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
4039 next_nonstatic_double_offset = next_nonstatic_field_offset;
4040 } else if( allocation_style == 2 ) {
4041 // Fields allocation: oops fields in super and sub classes are together.
4042 if( nonstatic_field_size > 0 && _super_klass != NULL &&
4043 _super_klass->nonstatic_oop_map_size() > 0 ) {
4044 const unsigned int map_count = _super_klass->nonstatic_oop_map_count();
4045 const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps();
4046 const OopMapBlock* const last_map = first_map + map_count - 1;
4047 const int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
4048 if (next_offset == next_nonstatic_field_offset) {
4049 allocation_style = 0; // allocate oops first
4050 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4051 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4052 (nonstatic_oop_count * heapOopSize);
4053 }
4054 }
4055 if( allocation_style == 2 ) {
4056 allocation_style = 1; // allocate oops last
4057 next_nonstatic_double_offset = next_nonstatic_field_offset;
4058 }
4059 } else {
4060 ShouldNotReachHere();
4061 }
4062
4063 int nonstatic_oop_space_count = 0;
4064 int nonstatic_word_space_count = 0;
4065 int nonstatic_short_space_count = 0;
4066 int nonstatic_byte_space_count = 0;
4067 int nonstatic_oop_space_offset = 0;
4068 int nonstatic_word_space_offset = 0;
4069 int nonstatic_short_space_offset = 0;
4070 int nonstatic_byte_space_offset = 0;
4071
4072 // Try to squeeze some of the fields into the gaps due to
4073 // long/double alignment.
4074 if (nonstatic_double_count > 0) {
4075 int offset = next_nonstatic_double_offset;
4076 next_nonstatic_double_offset = align_up(offset, BytesPerLong);
4077 if (compact_fields && offset != next_nonstatic_double_offset) {
4078 // Allocate available fields into the gap before double field.
4079 int length = next_nonstatic_double_offset - offset;
4080 assert(length == BytesPerInt, "");
4081 nonstatic_word_space_offset = offset;
4082 if (nonstatic_word_count > 0) {
4083 nonstatic_word_count -= 1;
4084 nonstatic_word_space_count = 1; // Only one will fit
4085 length -= BytesPerInt;
4086 offset += BytesPerInt;
4087 }
4088 nonstatic_short_space_offset = offset;
4089 while (length >= BytesPerShort && nonstatic_short_count > 0) {
4090 nonstatic_short_count -= 1;
4091 nonstatic_short_space_count += 1;
4092 length -= BytesPerShort;
4093 offset += BytesPerShort;
4094 }
4095 nonstatic_byte_space_offset = offset;
4096 while (length > 0 && nonstatic_byte_count > 0) {
4097 nonstatic_byte_count -= 1;
4098 nonstatic_byte_space_count += 1;
4099 length -= 1;
4100 }
4101 // Allocate oop field in the gap if there are no other fields for that.
4102 nonstatic_oop_space_offset = offset;
4103 if (length >= heapOopSize && nonstatic_oop_count > 0 &&
4104 allocation_style != 0) { // when oop fields not first
4105 nonstatic_oop_count -= 1;
4106 nonstatic_oop_space_count = 1; // Only one will fit
4107 length -= heapOopSize;
4108 offset += heapOopSize;
4109 }
4110 }
4111 }
4112
4113 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4114 (nonstatic_double_count * BytesPerLong);
4115 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4116 (nonstatic_word_count * BytesPerInt);
4117 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4118 (nonstatic_short_count * BytesPerShort);
4119 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4120 nonstatic_byte_count;
4121
4122 // let oops jump before padding with this allocation style
4123 if( allocation_style == 1 ) {
4124 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4125 if( nonstatic_oop_count > 0 ) {
4126 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4127 }
4128 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4129 }
4130
4131 // Iterate over fields again and compute correct offsets.
4132 // The field allocation type was temporarily stored in the offset slot.
4133 // oop fields are located before non-oop fields (static and non-static).
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 // contended instance fields are handled below
4140 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4141
4142 int real_offset = 0;
4143 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4144
4145 // pack the rest of the fields
4146 switch (atype) {
4147 case STATIC_OOP:
4148 real_offset = next_static_oop_offset;
4149 next_static_oop_offset += heapOopSize;
4150 break;
4151 case STATIC_BYTE:
4152 real_offset = next_static_byte_offset;
4153 next_static_byte_offset += 1;
4154 break;
4155 case STATIC_SHORT:
4156 real_offset = next_static_short_offset;
4157 next_static_short_offset += BytesPerShort;
4158 break;
4159 case STATIC_WORD:
4160 real_offset = next_static_word_offset;
4161 next_static_word_offset += BytesPerInt;
4162 break;
4163 case STATIC_DOUBLE:
4164 real_offset = next_static_double_offset;
4165 next_static_double_offset += BytesPerLong;
4166 break;
4167 case NONSTATIC_OOP:
4168 if( nonstatic_oop_space_count > 0 ) {
4169 real_offset = nonstatic_oop_space_offset;
4170 nonstatic_oop_space_offset += heapOopSize;
4171 nonstatic_oop_space_count -= 1;
4172 } else {
4173 real_offset = next_nonstatic_oop_offset;
4174 next_nonstatic_oop_offset += heapOopSize;
4175 }
4176
4177 // Record this oop in the oop maps
4178 if( nonstatic_oop_map_count > 0 &&
4179 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4180 real_offset -
4181 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4182 heapOopSize ) {
4183 // This oop is adjacent to the previous one, add to current oop map
4184 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4185 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4186 } else {
4187 // This oop is not adjacent to the previous one, create new oop map
4188 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4189 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4190 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4191 nonstatic_oop_map_count += 1;
4192 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4193 first_nonstatic_oop_offset = real_offset;
4194 }
4195 }
4196 break;
4197 case NONSTATIC_BYTE:
4198 if( nonstatic_byte_space_count > 0 ) {
4199 real_offset = nonstatic_byte_space_offset;
4200 nonstatic_byte_space_offset += 1;
4201 nonstatic_byte_space_count -= 1;
4202 } else {
4203 real_offset = next_nonstatic_byte_offset;
4204 next_nonstatic_byte_offset += 1;
4205 }
4206 break;
4207 case NONSTATIC_SHORT:
4208 if( nonstatic_short_space_count > 0 ) {
4209 real_offset = nonstatic_short_space_offset;
4210 nonstatic_short_space_offset += BytesPerShort;
4211 nonstatic_short_space_count -= 1;
4212 } else {
4213 real_offset = next_nonstatic_short_offset;
4214 next_nonstatic_short_offset += BytesPerShort;
4215 }
4216 break;
4217 case NONSTATIC_WORD:
4218 if( nonstatic_word_space_count > 0 ) {
4219 real_offset = nonstatic_word_space_offset;
4220 nonstatic_word_space_offset += BytesPerInt;
4221 nonstatic_word_space_count -= 1;
4222 } else {
4223 real_offset = next_nonstatic_word_offset;
4224 next_nonstatic_word_offset += BytesPerInt;
4225 }
4226 break;
4227 case NONSTATIC_DOUBLE:
4228 real_offset = next_nonstatic_double_offset;
4229 next_nonstatic_double_offset += BytesPerLong;
4230 break;
4231 default:
4232 ShouldNotReachHere();
4233 }
4234 fs.set_offset(real_offset);
4235 }
4236
4237
4238 // Handle the contended cases.
4239 //
4240 // Each contended field should not intersect the cache line with another contended field.
4241 // In the absence of alignment information, we end up with pessimistically separating
4242 // the fields with full-width padding.
4243 //
4244 // Additionally, this should not break alignment for the fields, so we round the alignment up
4245 // for each field.
4246 if (nonstatic_contended_count > 0) {
4247
4248 // if there is at least one contended field, we need to have pre-padding for them
4249 next_nonstatic_padded_offset += ContendedPaddingWidth;
4250
4251 // collect all contended groups
4252 ResourceBitMap bm(cp->size());
4253 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4254 // skip already laid out fields
4255 if (fs.is_offset_set()) continue;
4256
4257 if (fs.is_contended()) {
4258 bm.set_bit(fs.contended_group());
4259 }
4260 }
4261
4262 int current_group = -1;
4263 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4264
4265 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4266
4267 // skip already laid out fields
4268 if (fs.is_offset_set()) continue;
4269
4270 // skip non-contended fields and fields from different group
4271 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4272
4273 // handle statics below
4274 if (fs.access_flags().is_static()) continue;
4275
4276 int real_offset = 0;
4277 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4278
4279 switch (atype) {
4280 case NONSTATIC_BYTE:
4281 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4282 real_offset = next_nonstatic_padded_offset;
4283 next_nonstatic_padded_offset += 1;
4284 break;
4285
4286 case NONSTATIC_SHORT:
4287 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4288 real_offset = next_nonstatic_padded_offset;
4289 next_nonstatic_padded_offset += BytesPerShort;
4290 break;
4291
4292 case NONSTATIC_WORD:
4293 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4294 real_offset = next_nonstatic_padded_offset;
4295 next_nonstatic_padded_offset += BytesPerInt;
4296 break;
4297
4298 case NONSTATIC_DOUBLE:
4299 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4300 real_offset = next_nonstatic_padded_offset;
4301 next_nonstatic_padded_offset += BytesPerLong;
4302 break;
4303
4304 case NONSTATIC_OOP:
4305 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4306 real_offset = next_nonstatic_padded_offset;
4307 next_nonstatic_padded_offset += heapOopSize;
4308
4309 // Record this oop in the oop maps
4310 if( nonstatic_oop_map_count > 0 &&
4311 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4312 real_offset -
4313 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4314 heapOopSize ) {
4315 // This oop is adjacent to the previous one, add to current oop map
4316 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4317 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4318 } else {
4319 // This oop is not adjacent to the previous one, create new oop map
4320 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4321 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4322 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4323 nonstatic_oop_map_count += 1;
4324 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4325 first_nonstatic_oop_offset = real_offset;
4326 }
4327 }
4328 break;
4329
4330 default:
4331 ShouldNotReachHere();
4332 }
4333
4334 if (fs.contended_group() == 0) {
4335 // Contended group defines the equivalence class over the fields:
4336 // the fields within the same contended group are not inter-padded.
4337 // The only exception is default group, which does not incur the
4338 // equivalence, and so requires intra-padding.
4339 next_nonstatic_padded_offset += ContendedPaddingWidth;
4340 }
4341
4342 fs.set_offset(real_offset);
4343 } // for
4344
4345 // Start laying out the next group.
4346 // Note that this will effectively pad the last group in the back;
4347 // this is expected to alleviate memory contention effects for
4348 // subclass fields and/or adjacent object.
4349 // If this was the default group, the padding is already in place.
4350 if (current_group != 0) {
4351 next_nonstatic_padded_offset += ContendedPaddingWidth;
4352 }
4353 }
4354
4355 // handle static fields
4356 }
4357
4358 // Entire class is contended, pad in the back.
4359 // This helps to alleviate memory contention effects for subclass fields
4360 // and/or adjacent object.
4361 if (is_contended_class) {
4362 next_nonstatic_padded_offset += ContendedPaddingWidth;
4363 }
4364
4365 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4366
4367 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize);
4368 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4369 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4370
4371 int static_field_size = (static_fields_end -
4372 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4373 nonstatic_field_size = nonstatic_field_size +
4374 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4375
4376 int instance_size = align_object_size(instance_end / wordSize);
4377
4378 assert(instance_size == align_object_size(align_up(
4379 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
4380 wordSize) / wordSize), "consistent layout helper value");
4381
4382 // Invariant: nonstatic_field end/start should only change if there are
4383 // nonstatic fields in the class, or if the class is contended. We compare
4384 // against the non-aligned value, so that end alignment will not fail the
4385 // assert without actually having the fields.
4386 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4387 is_contended_class ||
4388 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4389
4390 // Number of non-static oop map blocks allocated at end of klass.
4391 const unsigned int total_oop_map_count =
4392 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
4393 first_nonstatic_oop_offset);
4394
4395 #ifndef PRODUCT
4396 if (PrintFieldLayout) {
4397 print_field_layout(_class_name,
4398 _fields,
4399 cp,
4400 instance_size,
4401 nonstatic_fields_start,
4402 nonstatic_fields_end,
4403 static_fields_end);
4404 }
4405
4406 #endif
4407 // Pass back information needed for InstanceKlass creation
4408 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
4409 info->nonstatic_oop_counts = nonstatic_oop_counts;
4410 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
4411 info->total_oop_map_count = total_oop_map_count;
4412 info->instance_size = instance_size;
4413 info->static_field_size = static_field_size;
4414 info->nonstatic_field_size = nonstatic_field_size;
4415 info->has_nonstatic_fields = has_nonstatic_fields;
4416 }
4417
fill_oop_maps(const InstanceKlass * k,unsigned int nonstatic_oop_map_count,const int * nonstatic_oop_offsets,const unsigned int * nonstatic_oop_counts)4418 static void fill_oop_maps(const InstanceKlass* k,
4419 unsigned int nonstatic_oop_map_count,
4420 const int* nonstatic_oop_offsets,
4421 const unsigned int* nonstatic_oop_counts) {
4422
4423 assert(k != NULL, "invariant");
4424
4425 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4426 const InstanceKlass* const super = k->superklass();
4427 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4428 if (super_count > 0) {
4429 // Copy maps from superklass
4430 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4431 for (unsigned int i = 0; i < super_count; ++i) {
4432 *this_oop_map++ = *super_oop_map++;
4433 }
4434 }
4435
4436 if (nonstatic_oop_map_count > 0) {
4437 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4438 // The counts differ because there is no gap between superklass's last oop
4439 // field and the first local oop field. Extend the last oop map copied
4440 // from the superklass instead of creating new one.
4441 nonstatic_oop_map_count--;
4442 nonstatic_oop_offsets++;
4443 this_oop_map--;
4444 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4445 this_oop_map++;
4446 }
4447
4448 // Add new map blocks, fill them
4449 while (nonstatic_oop_map_count-- > 0) {
4450 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4451 this_oop_map->set_count(*nonstatic_oop_counts++);
4452 this_oop_map++;
4453 }
4454 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4455 this_oop_map, "sanity");
4456 }
4457 }
4458
4459
set_precomputed_flags(InstanceKlass * ik)4460 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4461 assert(ik != NULL, "invariant");
4462
4463 const Klass* const super = ik->super();
4464
4465 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4466 // in which case we don't have to register objects as finalizable
4467 if (!_has_empty_finalizer) {
4468 if (_has_finalizer ||
4469 (super != NULL && super->has_finalizer())) {
4470 ik->set_has_finalizer();
4471 }
4472 }
4473
4474 #ifdef ASSERT
4475 bool f = false;
4476 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4477 vmSymbols::void_method_signature());
4478 if (m != NULL && !m->is_empty_method()) {
4479 f = true;
4480 }
4481
4482 // Spec doesn't prevent agent from redefinition of empty finalizer.
4483 // Despite the fact that it's generally bad idea and redefined finalizer
4484 // will not work as expected we shouldn't abort vm in this case
4485 if (!ik->has_redefined_this_or_super()) {
4486 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4487 }
4488 #endif
4489
4490 // Check if this klass supports the java.lang.Cloneable interface
4491 if (SystemDictionary::Cloneable_klass_loaded()) {
4492 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4493 ik->set_is_cloneable();
4494 }
4495 }
4496
4497 // Check if this klass has a vanilla default constructor
4498 if (super == NULL) {
4499 // java.lang.Object has empty default constructor
4500 ik->set_has_vanilla_constructor();
4501 } else {
4502 if (super->has_vanilla_constructor() &&
4503 _has_vanilla_constructor) {
4504 ik->set_has_vanilla_constructor();
4505 }
4506 #ifdef ASSERT
4507 bool v = false;
4508 if (super->has_vanilla_constructor()) {
4509 const Method* const constructor =
4510 ik->find_method(vmSymbols::object_initializer_name(),
4511 vmSymbols::void_method_signature());
4512 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4513 v = true;
4514 }
4515 }
4516 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4517 #endif
4518 }
4519
4520 // If it cannot be fast-path allocated, set a bit in the layout helper.
4521 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4522 assert(ik->size_helper() > 0, "layout_helper is initialized");
4523 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4524 || ik->is_abstract() || ik->is_interface()
4525 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4526 || ik->size_helper() >= FastAllocateSizeLimit) {
4527 // Forbid fast-path allocation.
4528 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4529 ik->set_layout_helper(lh);
4530 }
4531 }
4532
4533 // utility methods for appending an array with check for duplicates
4534
append_interfaces(GrowableArray<InstanceKlass * > * result,const Array<InstanceKlass * > * const ifs)4535 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4536 const Array<InstanceKlass*>* const ifs) {
4537 // iterate over new interfaces
4538 for (int i = 0; i < ifs->length(); i++) {
4539 InstanceKlass* const e = ifs->at(i);
4540 assert(e->is_klass() && e->is_interface(), "just checking");
4541 // add new interface
4542 result->append_if_missing(e);
4543 }
4544 }
4545
compute_transitive_interfaces(const InstanceKlass * super,Array<InstanceKlass * > * local_ifs,ClassLoaderData * loader_data,TRAPS)4546 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4547 Array<InstanceKlass*>* local_ifs,
4548 ClassLoaderData* loader_data,
4549 TRAPS) {
4550 assert(local_ifs != NULL, "invariant");
4551 assert(loader_data != NULL, "invariant");
4552
4553 // Compute maximum size for transitive interfaces
4554 int max_transitive_size = 0;
4555 int super_size = 0;
4556 // Add superclass transitive interfaces size
4557 if (super != NULL) {
4558 super_size = super->transitive_interfaces()->length();
4559 max_transitive_size += super_size;
4560 }
4561 // Add local interfaces' super interfaces
4562 const int local_size = local_ifs->length();
4563 for (int i = 0; i < local_size; i++) {
4564 InstanceKlass* const l = local_ifs->at(i);
4565 max_transitive_size += l->transitive_interfaces()->length();
4566 }
4567 // Finally add local interfaces
4568 max_transitive_size += local_size;
4569 // Construct array
4570 if (max_transitive_size == 0) {
4571 // no interfaces, use canonicalized array
4572 return Universe::the_empty_instance_klass_array();
4573 } else if (max_transitive_size == super_size) {
4574 // no new local interfaces added, share superklass' transitive interface array
4575 return super->transitive_interfaces();
4576 } else if (max_transitive_size == local_size) {
4577 // only local interfaces added, share local interface array
4578 return local_ifs;
4579 } else {
4580 ResourceMark rm;
4581 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4582
4583 // Copy down from superclass
4584 if (super != NULL) {
4585 append_interfaces(result, super->transitive_interfaces());
4586 }
4587
4588 // Copy down from local interfaces' superinterfaces
4589 for (int i = 0; i < local_size; i++) {
4590 InstanceKlass* const l = local_ifs->at(i);
4591 append_interfaces(result, l->transitive_interfaces());
4592 }
4593 // Finally add local interfaces
4594 append_interfaces(result, local_ifs);
4595
4596 // length will be less than the max_transitive_size if duplicates were removed
4597 const int length = result->length();
4598 assert(length <= max_transitive_size, "just checking");
4599 Array<InstanceKlass*>* const new_result =
4600 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4601 for (int i = 0; i < length; i++) {
4602 InstanceKlass* const e = result->at(i);
4603 assert(e != NULL, "just checking");
4604 new_result->at_put(i, e);
4605 }
4606 return new_result;
4607 }
4608 }
4609
check_super_class_access(const InstanceKlass * this_klass,TRAPS)4610 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4611 assert(this_klass != NULL, "invariant");
4612 const Klass* const super = this_klass->super();
4613 if (super != NULL) {
4614
4615 // If the loader is not the boot loader then throw an exception if its
4616 // superclass is in package jdk.internal.reflect and its loader is not a
4617 // special reflection class loader
4618 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4619 assert(super->is_instance_klass(), "super is not instance klass");
4620 PackageEntry* super_package = super->package();
4621 if (super_package != NULL &&
4622 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4623 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4624 ResourceMark rm(THREAD);
4625 Exceptions::fthrow(
4626 THREAD_AND_LOCATION,
4627 vmSymbols::java_lang_IllegalAccessError(),
4628 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4629 this_klass->external_name(),
4630 this_klass->class_loader_data()->loader_name_and_id(),
4631 super->external_name());
4632 return;
4633 }
4634 }
4635
4636 Reflection::VerifyClassAccessResults vca_result =
4637 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4638 if (vca_result != Reflection::ACCESS_OK) {
4639 ResourceMark rm(THREAD);
4640 char* msg = Reflection::verify_class_access_msg(this_klass,
4641 InstanceKlass::cast(super),
4642 vca_result);
4643 if (msg == NULL) {
4644 bool same_module = (this_klass->module() == super->module());
4645 Exceptions::fthrow(
4646 THREAD_AND_LOCATION,
4647 vmSymbols::java_lang_IllegalAccessError(),
4648 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4649 this_klass->external_name(),
4650 super->is_abstract() ? "abstract " : "",
4651 super->external_name(),
4652 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4653 (same_module) ? "" : "; ",
4654 (same_module) ? "" : super->class_in_module_of_loader());
4655 } else {
4656 // Add additional message content.
4657 Exceptions::fthrow(
4658 THREAD_AND_LOCATION,
4659 vmSymbols::java_lang_IllegalAccessError(),
4660 "superclass access check failed: %s",
4661 msg);
4662 }
4663 }
4664 }
4665 }
4666
4667
check_super_interface_access(const InstanceKlass * this_klass,TRAPS)4668 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4669 assert(this_klass != NULL, "invariant");
4670 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4671 const int lng = local_interfaces->length();
4672 for (int i = lng - 1; i >= 0; i--) {
4673 InstanceKlass* const k = local_interfaces->at(i);
4674 assert (k != NULL && k->is_interface(), "invalid interface");
4675 Reflection::VerifyClassAccessResults vca_result =
4676 Reflection::verify_class_access(this_klass, k, false);
4677 if (vca_result != Reflection::ACCESS_OK) {
4678 ResourceMark rm(THREAD);
4679 char* msg = Reflection::verify_class_access_msg(this_klass,
4680 k,
4681 vca_result);
4682 if (msg == NULL) {
4683 bool same_module = (this_klass->module() == k->module());
4684 Exceptions::fthrow(
4685 THREAD_AND_LOCATION,
4686 vmSymbols::java_lang_IllegalAccessError(),
4687 "class %s cannot access its superinterface %s (%s%s%s)",
4688 this_klass->external_name(),
4689 k->external_name(),
4690 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4691 (same_module) ? "" : "; ",
4692 (same_module) ? "" : k->class_in_module_of_loader());
4693 } else {
4694 // Add additional message content.
4695 Exceptions::fthrow(
4696 THREAD_AND_LOCATION,
4697 vmSymbols::java_lang_IllegalAccessError(),
4698 "superinterface check failed: %s",
4699 msg);
4700 }
4701 }
4702 }
4703 }
4704
4705
check_final_method_override(const InstanceKlass * this_klass,TRAPS)4706 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4707 assert(this_klass != NULL, "invariant");
4708 const Array<Method*>* const methods = this_klass->methods();
4709 const int num_methods = methods->length();
4710
4711 // go thru each method and check if it overrides a final method
4712 for (int index = 0; index < num_methods; index++) {
4713 const Method* const m = methods->at(index);
4714
4715 // skip private, static, and <init> methods
4716 if ((!m->is_private() && !m->is_static()) &&
4717 (m->name() != vmSymbols::object_initializer_name())) {
4718
4719 const Symbol* const name = m->name();
4720 const Symbol* const signature = m->signature();
4721 const Klass* k = this_klass->super();
4722 const Method* super_m = NULL;
4723 while (k != NULL) {
4724 // skip supers that don't have final methods.
4725 if (k->has_final_method()) {
4726 // lookup a matching method in the super class hierarchy
4727 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4728 if (super_m == NULL) {
4729 break; // didn't find any match; get out
4730 }
4731
4732 if (super_m->is_final() && !super_m->is_static() &&
4733 !super_m->access_flags().is_private()) {
4734 // matching method in super is final, and not static or private
4735 bool can_access = Reflection::verify_member_access(this_klass,
4736 super_m->method_holder(),
4737 super_m->method_holder(),
4738 super_m->access_flags(),
4739 false, false, CHECK);
4740 if (can_access) {
4741 // this class can access super final method and therefore override
4742 ResourceMark rm(THREAD);
4743 Exceptions::fthrow(THREAD_AND_LOCATION,
4744 vmSymbols::java_lang_VerifyError(),
4745 "class %s overrides final method %s.%s%s",
4746 this_klass->external_name(),
4747 super_m->method_holder()->external_name(),
4748 name->as_C_string(),
4749 signature->as_C_string()
4750 );
4751 return;
4752 }
4753 }
4754
4755 // continue to look from super_m's holder's super.
4756 k = super_m->method_holder()->super();
4757 continue;
4758 }
4759
4760 k = k->super();
4761 }
4762 }
4763 }
4764 }
4765
4766
4767 // assumes that this_klass is an interface
check_illegal_static_method(const InstanceKlass * this_klass,TRAPS)4768 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4769 assert(this_klass != NULL, "invariant");
4770 assert(this_klass->is_interface(), "not an interface");
4771 const Array<Method*>* methods = this_klass->methods();
4772 const int num_methods = methods->length();
4773
4774 for (int index = 0; index < num_methods; index++) {
4775 const Method* const m = methods->at(index);
4776 // if m is static and not the init method, throw a verify error
4777 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4778 ResourceMark rm(THREAD);
4779 Exceptions::fthrow(
4780 THREAD_AND_LOCATION,
4781 vmSymbols::java_lang_VerifyError(),
4782 "Illegal static method %s in interface %s",
4783 m->name()->as_C_string(),
4784 this_klass->external_name()
4785 );
4786 return;
4787 }
4788 }
4789 }
4790
4791 // utility methods for format checking
4792
verify_legal_class_modifiers(jint flags,TRAPS) const4793 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4794 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4795 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4796 if (is_module) {
4797 ResourceMark rm(THREAD);
4798 Exceptions::fthrow(
4799 THREAD_AND_LOCATION,
4800 vmSymbols::java_lang_NoClassDefFoundError(),
4801 "%s is not a class because access_flag ACC_MODULE is set",
4802 _class_name->as_C_string());
4803 return;
4804 }
4805
4806 if (!_need_verify) { return; }
4807
4808 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4809 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4810 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4811 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4812 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4813 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4814 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4815
4816 if ((is_abstract && is_final) ||
4817 (is_interface && !is_abstract) ||
4818 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4819 (!is_interface && major_gte_15 && is_annotation)) {
4820 ResourceMark rm(THREAD);
4821 Exceptions::fthrow(
4822 THREAD_AND_LOCATION,
4823 vmSymbols::java_lang_ClassFormatError(),
4824 "Illegal class modifiers in class %s: 0x%X",
4825 _class_name->as_C_string(), flags
4826 );
4827 return;
4828 }
4829 }
4830
has_illegal_visibility(jint flags)4831 static bool has_illegal_visibility(jint flags) {
4832 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4833 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4834 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4835
4836 return ((is_public && is_protected) ||
4837 (is_public && is_private) ||
4838 (is_protected && is_private));
4839 }
4840
4841 // A legal major_version.minor_version must be one of the following:
4842 //
4843 // Major_version >= 45 and major_version < 56, any minor_version.
4844 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4845 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4846 //
verify_class_version(u2 major,u2 minor,Symbol * class_name,TRAPS)4847 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4848 ResourceMark rm(THREAD);
4849 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4850 if (major < JAVA_MIN_SUPPORTED_VERSION) {
4851 Exceptions::fthrow(
4852 THREAD_AND_LOCATION,
4853 vmSymbols::java_lang_UnsupportedClassVersionError(),
4854 "%s (class file version %u.%u) was compiled with an invalid major version",
4855 class_name->as_C_string(), major, minor);
4856 return;
4857 }
4858
4859 if (major > max_version) {
4860 Exceptions::fthrow(
4861 THREAD_AND_LOCATION,
4862 vmSymbols::java_lang_UnsupportedClassVersionError(),
4863 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4864 "this version of the Java Runtime only recognizes class file versions up to %u.0",
4865 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4866 return;
4867 }
4868
4869 if (major < JAVA_12_VERSION || minor == 0) {
4870 return;
4871 }
4872
4873 if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4874 if (major != max_version) {
4875 Exceptions::fthrow(
4876 THREAD_AND_LOCATION,
4877 vmSymbols::java_lang_UnsupportedClassVersionError(),
4878 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4879 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4880 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4881 return;
4882 }
4883
4884 if (!Arguments::enable_preview()) {
4885 Exceptions::fthrow(
4886 THREAD_AND_LOCATION,
4887 vmSymbols::java_lang_UnsupportedClassVersionError(),
4888 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4889 class_name->as_C_string(), major, minor);
4890 return;
4891 }
4892
4893 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4894 Exceptions::fthrow(
4895 THREAD_AND_LOCATION,
4896 vmSymbols::java_lang_UnsupportedClassVersionError(),
4897 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4898 class_name->as_C_string(), major, minor);
4899 }
4900 }
4901
verify_legal_field_modifiers(jint flags,bool is_interface,TRAPS) const4902 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4903 bool is_interface,
4904 TRAPS) const {
4905 if (!_need_verify) { return; }
4906
4907 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4908 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4909 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4910 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4911 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4912 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4913 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4914 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4915 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4916
4917 bool is_illegal = false;
4918
4919 if (is_interface) {
4920 if (!is_public || !is_static || !is_final || is_private ||
4921 is_protected || is_volatile || is_transient ||
4922 (major_gte_15 && is_enum)) {
4923 is_illegal = true;
4924 }
4925 } else { // not interface
4926 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4927 is_illegal = true;
4928 }
4929 }
4930
4931 if (is_illegal) {
4932 ResourceMark rm(THREAD);
4933 Exceptions::fthrow(
4934 THREAD_AND_LOCATION,
4935 vmSymbols::java_lang_ClassFormatError(),
4936 "Illegal field modifiers in class %s: 0x%X",
4937 _class_name->as_C_string(), flags);
4938 return;
4939 }
4940 }
4941
verify_legal_method_modifiers(jint flags,bool is_interface,const Symbol * name,TRAPS) const4942 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4943 bool is_interface,
4944 const Symbol* name,
4945 TRAPS) const {
4946 if (!_need_verify) { return; }
4947
4948 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4949 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4950 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4951 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4952 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4953 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4954 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4955 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4956 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4957 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4958 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4959 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4960 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4961
4962 bool is_illegal = false;
4963
4964 if (is_interface) {
4965 if (major_gte_8) {
4966 // Class file version is JAVA_8_VERSION or later Methods of
4967 // interfaces may set any of the flags except ACC_PROTECTED,
4968 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4969 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4970 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4971 (is_native || is_protected || is_final || is_synchronized) ||
4972 // If a specific method of a class or interface has its
4973 // ACC_ABSTRACT flag set, it must not have any of its
4974 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4975 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4976 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4977 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4978 (is_abstract && (is_private || is_static || is_strict))) {
4979 is_illegal = true;
4980 }
4981 } else if (major_gte_15) {
4982 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4983 if (!is_public || is_private || is_protected || is_static || is_final ||
4984 is_synchronized || is_native || !is_abstract || is_strict) {
4985 is_illegal = true;
4986 }
4987 } else {
4988 // Class file version is pre-JAVA_1_5_VERSION
4989 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4990 is_illegal = true;
4991 }
4992 }
4993 } else { // not interface
4994 if (has_illegal_visibility(flags)) {
4995 is_illegal = true;
4996 } else {
4997 if (is_initializer) {
4998 if (is_static || is_final || is_synchronized || is_native ||
4999 is_abstract || (major_gte_15 && is_bridge)) {
5000 is_illegal = true;
5001 }
5002 } else { // not initializer
5003 if (is_abstract) {
5004 if ((is_final || is_native || is_private || is_static ||
5005 (major_gte_15 && (is_synchronized || is_strict)))) {
5006 is_illegal = true;
5007 }
5008 }
5009 }
5010 }
5011 }
5012
5013 if (is_illegal) {
5014 ResourceMark rm(THREAD);
5015 Exceptions::fthrow(
5016 THREAD_AND_LOCATION,
5017 vmSymbols::java_lang_ClassFormatError(),
5018 "Method %s in class %s has illegal modifiers: 0x%X",
5019 name->as_C_string(), _class_name->as_C_string(), flags);
5020 return;
5021 }
5022 }
5023
verify_legal_utf8(const unsigned char * buffer,int length,TRAPS) const5024 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5025 int length,
5026 TRAPS) const {
5027 assert(_need_verify, "only called when _need_verify is true");
5028 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5029 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5030 }
5031 }
5032
5033 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5034 // In class names, '/' separates unqualified names. This is verified in this function also.
5035 // Method names also may not contain the characters '<' or '>', unless <init>
5036 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5037 // method. Because these names have been checked as special cases before
5038 // calling this method in verify_legal_method_name.
5039 //
5040 // This method is also called from the modular system APIs in modules.cpp
5041 // to verify the validity of module and package names.
verify_unqualified_name(const char * name,unsigned int length,int type)5042 bool ClassFileParser::verify_unqualified_name(const char* name,
5043 unsigned int length,
5044 int type) {
5045 if (length == 0) return false; // Must have at least one char.
5046 for (const char* p = name; p != name + length; p++) {
5047 switch(*p) {
5048 case '.':
5049 case ';':
5050 case '[':
5051 // do not permit '.', ';', or '['
5052 return false;
5053 case '/':
5054 // check for '//' or leading or trailing '/' which are not legal
5055 // unqualified name must not be empty
5056 if (type == ClassFileParser::LegalClass) {
5057 if (p == name || p+1 >= name+length || *(p+1) == '/') {
5058 return false;
5059 }
5060 } else {
5061 return false; // do not permit '/' unless it's class name
5062 }
5063 break;
5064 case '<':
5065 case '>':
5066 // do not permit '<' or '>' in method names
5067 if (type == ClassFileParser::LegalMethod) {
5068 return false;
5069 }
5070 }
5071 }
5072 return true;
5073 }
5074
5075 // Take pointer to a UTF8 byte string (not NUL-terminated).
5076 // Skip over the longest part of the string that could
5077 // be taken as a fieldname. Allow '/' if slash_ok is true.
5078 // Return a pointer to just past the fieldname.
5079 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5080 // being true, we saw consecutive slashes (meaning we were looking for a
5081 // qualified path but found something that was badly-formed).
skip_over_field_name(const char * const name,bool slash_ok,unsigned int length)5082 static const char* skip_over_field_name(const char* const name,
5083 bool slash_ok,
5084 unsigned int length) {
5085 const char* p;
5086 jboolean last_is_slash = false;
5087 jboolean not_first_ch = false;
5088
5089 for (p = name; p != name + length; not_first_ch = true) {
5090 const char* old_p = p;
5091 jchar ch = *p;
5092 if (ch < 128) {
5093 p++;
5094 // quick check for ascii
5095 if ((ch >= 'a' && ch <= 'z') ||
5096 (ch >= 'A' && ch <= 'Z') ||
5097 (ch == '_' || ch == '$') ||
5098 (not_first_ch && ch >= '0' && ch <= '9')) {
5099 last_is_slash = false;
5100 continue;
5101 }
5102 if (slash_ok && ch == '/') {
5103 if (last_is_slash) {
5104 return NULL; // Don't permit consecutive slashes
5105 }
5106 last_is_slash = true;
5107 continue;
5108 }
5109 }
5110 else {
5111 jint unicode_ch;
5112 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5113 p = tmp_p;
5114 last_is_slash = false;
5115 // Check if ch is Java identifier start or is Java identifier part
5116 // 4672820: call java.lang.Character methods directly without generating separate tables.
5117 EXCEPTION_MARK;
5118 // return value
5119 JavaValue result(T_BOOLEAN);
5120 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
5121 JavaCallArguments args;
5122 args.push_int(unicode_ch);
5123
5124 if (not_first_ch) {
5125 // public static boolean isJavaIdentifierPart(char ch);
5126 JavaCalls::call_static(&result,
5127 SystemDictionary::Character_klass(),
5128 vmSymbols::isJavaIdentifierPart_name(),
5129 vmSymbols::int_bool_signature(),
5130 &args,
5131 THREAD);
5132 } else {
5133 // public static boolean isJavaIdentifierStart(char ch);
5134 JavaCalls::call_static(&result,
5135 SystemDictionary::Character_klass(),
5136 vmSymbols::isJavaIdentifierStart_name(),
5137 vmSymbols::int_bool_signature(),
5138 &args,
5139 THREAD);
5140 }
5141 if (HAS_PENDING_EXCEPTION) {
5142 CLEAR_PENDING_EXCEPTION;
5143 return NULL;
5144 }
5145 if(result.get_jboolean()) {
5146 continue;
5147 }
5148 }
5149 return (not_first_ch) ? old_p : NULL;
5150 }
5151 return (not_first_ch) ? p : NULL;
5152 }
5153
5154 // Take pointer to a UTF8 byte string (not NUL-terminated).
5155 // Skip over the longest part of the string that could
5156 // be taken as a field signature. Allow "void" if void_ok.
5157 // Return a pointer to just past the signature.
5158 // Return NULL if no legal signature is found.
skip_over_field_signature(const char * signature,bool void_ok,unsigned int length,TRAPS) const5159 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5160 bool void_ok,
5161 unsigned int length,
5162 TRAPS) const {
5163 unsigned int array_dim = 0;
5164 while (length > 0) {
5165 switch (signature[0]) {
5166 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5167 case JVM_SIGNATURE_BOOLEAN:
5168 case JVM_SIGNATURE_BYTE:
5169 case JVM_SIGNATURE_CHAR:
5170 case JVM_SIGNATURE_SHORT:
5171 case JVM_SIGNATURE_INT:
5172 case JVM_SIGNATURE_FLOAT:
5173 case JVM_SIGNATURE_LONG:
5174 case JVM_SIGNATURE_DOUBLE:
5175 return signature + 1;
5176 case JVM_SIGNATURE_CLASS: {
5177 if (_major_version < JAVA_1_5_VERSION) {
5178 // Skip over the class name if one is there
5179 const char* const p = skip_over_field_name(signature + 1, true, --length);
5180
5181 // The next character better be a semicolon
5182 if (p && (p - signature) > 1 && p[0] == ';') {
5183 return p + 1;
5184 }
5185 }
5186 else {
5187 // Skip leading 'L' and ignore first appearance of ';'
5188 signature++;
5189 const char* c = (const char*) memchr(signature, ';', length - 1);
5190 // Format check signature
5191 if (c != NULL) {
5192 int newlen = c - (char*) signature;
5193 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5194 if (!legal) {
5195 classfile_parse_error("Class name is empty or contains illegal character "
5196 "in descriptor in class file %s",
5197 CHECK_0);
5198 return NULL;
5199 }
5200 return signature + newlen + 1;
5201 }
5202 }
5203 return NULL;
5204 }
5205 case JVM_SIGNATURE_ARRAY:
5206 array_dim++;
5207 if (array_dim > 255) {
5208 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5209 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5210 }
5211 // The rest of what's there better be a legal signature
5212 signature++;
5213 length--;
5214 void_ok = false;
5215 break;
5216 default:
5217 return NULL;
5218 }
5219 }
5220 return NULL;
5221 }
5222
5223 // Checks if name is a legal class name.
verify_legal_class_name(const Symbol * name,TRAPS) const5224 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5225 if (!_need_verify || _relax_verify) { return; }
5226
5227 assert(name->refcount() > 0, "symbol must be kept alive");
5228 char* bytes = (char*)name->bytes();
5229 unsigned int length = name->utf8_length();
5230 bool legal = false;
5231
5232 if (length > 0) {
5233 const char* p;
5234 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5235 p = skip_over_field_signature(bytes, false, length, CHECK);
5236 legal = (p != NULL) && ((p - bytes) == (int)length);
5237 } else if (_major_version < JAVA_1_5_VERSION) {
5238 if (bytes[0] != '<') {
5239 p = skip_over_field_name(bytes, true, length);
5240 legal = (p != NULL) && ((p - bytes) == (int)length);
5241 }
5242 } else {
5243 // 4900761: relax the constraints based on JSR202 spec
5244 // Class names may be drawn from the entire Unicode character set.
5245 // Identifiers between '/' must be unqualified names.
5246 // The utf8 string has been verified when parsing cpool entries.
5247 legal = verify_unqualified_name(bytes, length, LegalClass);
5248 }
5249 }
5250 if (!legal) {
5251 ResourceMark rm(THREAD);
5252 assert(_class_name != NULL, "invariant");
5253 Exceptions::fthrow(
5254 THREAD_AND_LOCATION,
5255 vmSymbols::java_lang_ClassFormatError(),
5256 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5257 _class_name->as_C_string()
5258 );
5259 return;
5260 }
5261 }
5262
5263 // Checks if name is a legal field name.
verify_legal_field_name(const Symbol * name,TRAPS) const5264 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5265 if (!_need_verify || _relax_verify) { return; }
5266
5267 char* bytes = (char*)name->bytes();
5268 unsigned int length = name->utf8_length();
5269 bool legal = false;
5270
5271 if (length > 0) {
5272 if (_major_version < JAVA_1_5_VERSION) {
5273 if (bytes[0] != '<') {
5274 const char* p = skip_over_field_name(bytes, false, length);
5275 legal = (p != NULL) && ((p - bytes) == (int)length);
5276 }
5277 } else {
5278 // 4881221: relax the constraints based on JSR202 spec
5279 legal = verify_unqualified_name(bytes, length, LegalField);
5280 }
5281 }
5282
5283 if (!legal) {
5284 ResourceMark rm(THREAD);
5285 assert(_class_name != NULL, "invariant");
5286 Exceptions::fthrow(
5287 THREAD_AND_LOCATION,
5288 vmSymbols::java_lang_ClassFormatError(),
5289 "Illegal field name \"%.*s\" in class %s", length, bytes,
5290 _class_name->as_C_string()
5291 );
5292 return;
5293 }
5294 }
5295
5296 // Checks if name is a legal method name.
verify_legal_method_name(const Symbol * name,TRAPS) const5297 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5298 if (!_need_verify || _relax_verify) { return; }
5299
5300 assert(name != NULL, "method name is null");
5301 char* bytes = (char*)name->bytes();
5302 unsigned int length = name->utf8_length();
5303 bool legal = false;
5304
5305 if (length > 0) {
5306 if (bytes[0] == '<') {
5307 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5308 legal = true;
5309 }
5310 } else if (_major_version < JAVA_1_5_VERSION) {
5311 const char* p;
5312 p = skip_over_field_name(bytes, false, length);
5313 legal = (p != NULL) && ((p - bytes) == (int)length);
5314 } else {
5315 // 4881221: relax the constraints based on JSR202 spec
5316 legal = verify_unqualified_name(bytes, length, LegalMethod);
5317 }
5318 }
5319
5320 if (!legal) {
5321 ResourceMark rm(THREAD);
5322 assert(_class_name != NULL, "invariant");
5323 Exceptions::fthrow(
5324 THREAD_AND_LOCATION,
5325 vmSymbols::java_lang_ClassFormatError(),
5326 "Illegal method name \"%.*s\" in class %s", length, bytes,
5327 _class_name->as_C_string()
5328 );
5329 return;
5330 }
5331 }
5332
5333
5334 // Checks if signature is a legal field signature.
verify_legal_field_signature(const Symbol * name,const Symbol * signature,TRAPS) const5335 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5336 const Symbol* signature,
5337 TRAPS) const {
5338 if (!_need_verify) { return; }
5339
5340 const char* const bytes = (const char* const)signature->bytes();
5341 const unsigned int length = signature->utf8_length();
5342 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5343
5344 if (p == NULL || (p - bytes) != (int)length) {
5345 throwIllegalSignature("Field", name, signature, CHECK);
5346 }
5347 }
5348
5349 // Checks if signature is a legal method signature.
5350 // Returns number of parameters
verify_legal_method_signature(const Symbol * name,const Symbol * signature,TRAPS) const5351 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5352 const Symbol* signature,
5353 TRAPS) const {
5354 if (!_need_verify) {
5355 // make sure caller's args_size will be less than 0 even for non-static
5356 // method so it will be recomputed in compute_size_of_parameters().
5357 return -2;
5358 }
5359
5360 // Class initializers cannot have args for class format version >= 51.
5361 if (name == vmSymbols::class_initializer_name() &&
5362 signature != vmSymbols::void_method_signature() &&
5363 _major_version >= JAVA_7_VERSION) {
5364 throwIllegalSignature("Method", name, signature, CHECK_0);
5365 return 0;
5366 }
5367
5368 unsigned int args_size = 0;
5369 const char* p = (const char*)signature->bytes();
5370 unsigned int length = signature->utf8_length();
5371 const char* nextp;
5372
5373 // The first character must be a '('
5374 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5375 length--;
5376 // Skip over legal field signatures
5377 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5378 while ((length > 0) && (nextp != NULL)) {
5379 args_size++;
5380 if (p[0] == 'J' || p[0] == 'D') {
5381 args_size++;
5382 }
5383 length -= nextp - p;
5384 p = nextp;
5385 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5386 }
5387 // The first non-signature thing better be a ')'
5388 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5389 length--;
5390 if (name->utf8_length() > 0 && name->char_at(0) == '<') {
5391 // All internal methods must return void
5392 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5393 return args_size;
5394 }
5395 } else {
5396 // Now we better just have a return value
5397 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5398 if (nextp && ((int)length == (nextp - p))) {
5399 return args_size;
5400 }
5401 }
5402 }
5403 }
5404 // Report error
5405 throwIllegalSignature("Method", name, signature, CHECK_0);
5406 return 0;
5407 }
5408
static_field_size() const5409 int ClassFileParser::static_field_size() const {
5410 assert(_field_info != NULL, "invariant");
5411 return _field_info->static_field_size;
5412 }
5413
total_oop_map_count() const5414 int ClassFileParser::total_oop_map_count() const {
5415 assert(_field_info != NULL, "invariant");
5416 return _field_info->total_oop_map_count;
5417 }
5418
layout_size() const5419 jint ClassFileParser::layout_size() const {
5420 assert(_field_info != NULL, "invariant");
5421 return _field_info->instance_size;
5422 }
5423
check_methods_for_intrinsics(const InstanceKlass * ik,const Array<Method * > * methods)5424 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5425 const Array<Method*>* methods) {
5426 assert(ik != NULL, "invariant");
5427 assert(methods != NULL, "invariant");
5428
5429 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5430 // (We used to do this lazily, but now we query it in Rewriter,
5431 // which is eagerly done for every method, so we might as well do it now,
5432 // when everything is fresh in memory.)
5433 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5434
5435 if (klass_id != vmSymbols::NO_SID) {
5436 for (int j = 0; j < methods->length(); ++j) {
5437 Method* method = methods->at(j);
5438 method->init_intrinsic_id();
5439
5440 if (CheckIntrinsics) {
5441 // Check if an intrinsic is defined for method 'method',
5442 // but the method is not annotated with @HotSpotIntrinsicCandidate.
5443 if (method->intrinsic_id() != vmIntrinsics::_none &&
5444 !method->intrinsic_candidate()) {
5445 tty->print("Compiler intrinsic is defined for method [%s], "
5446 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5447 method->name_and_sig_as_C_string(),
5448 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5449 );
5450 tty->cr();
5451 DEBUG_ONLY(vm_exit(1));
5452 }
5453 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5454 // but there is no intrinsic available for it.
5455 if (method->intrinsic_candidate() &&
5456 method->intrinsic_id() == vmIntrinsics::_none) {
5457 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5458 "but no compiler intrinsic is defined for the method.%s",
5459 method->name_and_sig_as_C_string(),
5460 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5461 );
5462 tty->cr();
5463 DEBUG_ONLY(vm_exit(1));
5464 }
5465 }
5466 } // end for
5467
5468 #ifdef ASSERT
5469 if (CheckIntrinsics) {
5470 // Check for orphan methods in the current class. A method m
5471 // of a class C is orphan if an intrinsic is defined for method m,
5472 // but class C does not declare m.
5473 // The check is potentially expensive, therefore it is available
5474 // only in debug builds.
5475
5476 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5477 if (vmIntrinsics::_compiledLambdaForm == id) {
5478 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5479 // generated for the JVM from a LambdaForm and therefore no method
5480 // is defined for it.
5481 continue;
5482 }
5483
5484 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5485 // Check if the current class contains a method with the same
5486 // name, flags, signature.
5487 bool match = false;
5488 for (int j = 0; j < methods->length(); ++j) {
5489 const Method* method = methods->at(j);
5490 if (method->intrinsic_id() == id) {
5491 match = true;
5492 break;
5493 }
5494 }
5495
5496 if (!match) {
5497 char buf[1000];
5498 tty->print("Compiler intrinsic is defined for method [%s], "
5499 "but the method is not available in class [%s].%s",
5500 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5501 buf, sizeof(buf)),
5502 ik->name()->as_C_string(),
5503 NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5504 );
5505 tty->cr();
5506 DEBUG_ONLY(vm_exit(1));
5507 }
5508 }
5509 } // end for
5510 } // CheckIntrinsics
5511 #endif // ASSERT
5512 }
5513 }
5514
create_instance_klass(bool changed_by_loadhook,TRAPS)5515 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5516 if (_klass != NULL) {
5517 return _klass;
5518 }
5519
5520 InstanceKlass* const ik =
5521 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5522
5523 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5524
5525 assert(_klass == ik, "invariant");
5526
5527
5528 if (ik->should_store_fingerprint()) {
5529 ik->store_fingerprint(_stream->compute_fingerprint());
5530 }
5531
5532 ik->set_has_passed_fingerprint_check(false);
5533 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5534 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5535 uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint();
5536 if (aot_fp != 0 && aot_fp == fp) {
5537 // This class matches with a class saved in an AOT library
5538 ik->set_has_passed_fingerprint_check(true);
5539 } else {
5540 ResourceMark rm;
5541 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5542 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5543 }
5544 }
5545
5546 return ik;
5547 }
5548
fill_instance_klass(InstanceKlass * ik,bool changed_by_loadhook,TRAPS)5549 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5550 assert(ik != NULL, "invariant");
5551
5552 // Set name and CLD before adding to CLD
5553 ik->set_class_loader_data(_loader_data);
5554 ik->set_name(_class_name);
5555
5556 // Add all classes to our internal class loader list here,
5557 // including classes in the bootstrap (NULL) class loader.
5558 const bool publicize = !is_internal();
5559
5560 _loader_data->add_class(ik, publicize);
5561
5562 set_klass_to_deallocate(ik);
5563
5564 assert(_field_info != NULL, "invariant");
5565 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5566 assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count,
5567 "sanity");
5568
5569 assert(ik->is_instance_klass(), "sanity");
5570 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5571
5572 // Fill in information already parsed
5573 ik->set_should_verify_class(_need_verify);
5574
5575 // Not yet: supers are done below to support the new subtype-checking fields
5576 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5577 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5578 assert(_fac != NULL, "invariant");
5579 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5580
5581 // this transfers ownership of a lot of arrays from
5582 // the parser onto the InstanceKlass*
5583 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5584
5585 // note that is not safe to use the fields in the parser from this point on
5586 assert(NULL == _cp, "invariant");
5587 assert(NULL == _fields, "invariant");
5588 assert(NULL == _methods, "invariant");
5589 assert(NULL == _inner_classes, "invariant");
5590 assert(NULL == _nest_members, "invariant");
5591 assert(NULL == _local_interfaces, "invariant");
5592 assert(NULL == _combined_annotations, "invariant");
5593
5594 if (_has_final_method) {
5595 ik->set_has_final_method();
5596 }
5597
5598 ik->copy_method_ordering(_method_ordering, CHECK);
5599 // The InstanceKlass::_methods_jmethod_ids cache
5600 // is managed on the assumption that the initial cache
5601 // size is equal to the number of methods in the class. If
5602 // that changes, then InstanceKlass::idnum_can_increment()
5603 // has to be changed accordingly.
5604 ik->set_initial_method_idnum(ik->methods()->length());
5605
5606 ik->set_this_class_index(_this_class_index);
5607
5608 if (is_unsafe_anonymous()) {
5609 // _this_class_index is a CONSTANT_Class entry that refers to this
5610 // anonymous class itself. If this class needs to refer to its own methods or
5611 // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5612 // _this_class_index. However, because this class is anonymous (it's
5613 // not stored in SystemDictionary), _this_class_index cannot be resolved
5614 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5615 // Therefore, we must eagerly resolve _this_class_index now.
5616 ik->constants()->klass_at_put(_this_class_index, ik);
5617 }
5618
5619 ik->set_minor_version(_minor_version);
5620 ik->set_major_version(_major_version);
5621 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5622 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5623
5624 if (_unsafe_anonymous_host != NULL) {
5625 assert (ik->is_unsafe_anonymous(), "should be the same");
5626 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host);
5627 }
5628
5629 // Set PackageEntry for this_klass
5630 oop cl = ik->class_loader();
5631 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5632 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5633 ik->set_package(cld, CHECK);
5634
5635 const Array<Method*>* const methods = ik->methods();
5636 assert(methods != NULL, "invariant");
5637 const int methods_len = methods->length();
5638
5639 check_methods_for_intrinsics(ik, methods);
5640
5641 // Fill in field values obtained by parse_classfile_attributes
5642 if (_parsed_annotations->has_any_annotations()) {
5643 _parsed_annotations->apply_to(ik);
5644 }
5645
5646 apply_parsed_class_attributes(ik);
5647
5648 // Miranda methods
5649 if ((_num_miranda_methods > 0) ||
5650 // if this class introduced new miranda methods or
5651 (_super_klass != NULL && _super_klass->has_miranda_methods())
5652 // super class exists and this class inherited miranda methods
5653 ) {
5654 ik->set_has_miranda_methods(); // then set a flag
5655 }
5656
5657 // Fill in information needed to compute superclasses.
5658 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5659 ik->set_transitive_interfaces(_transitive_interfaces);
5660 _transitive_interfaces = NULL;
5661
5662 // Initialize itable offset tables
5663 klassItable::setup_itable_offset_table(ik);
5664
5665 // Compute transitive closure of interfaces this class implements
5666 // Do final class setup
5667 fill_oop_maps(ik,
5668 _field_info->nonstatic_oop_map_count,
5669 _field_info->nonstatic_oop_offsets,
5670 _field_info->nonstatic_oop_counts);
5671
5672 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5673 set_precomputed_flags(ik);
5674
5675 // check if this class can access its super class
5676 check_super_class_access(ik, CHECK);
5677
5678 // check if this class can access its superinterfaces
5679 check_super_interface_access(ik, CHECK);
5680
5681 // check if this class overrides any final method
5682 check_final_method_override(ik, CHECK);
5683
5684 // reject static interface methods prior to Java 8
5685 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5686 check_illegal_static_method(ik, CHECK);
5687 }
5688
5689 // Obtain this_klass' module entry
5690 ModuleEntry* module_entry = ik->module();
5691 assert(module_entry != NULL, "module_entry should always be set");
5692
5693 // Obtain java.lang.Module
5694 Handle module_handle(THREAD, module_entry->module());
5695
5696 // Allocate mirror and initialize static fields
5697 // The create_mirror() call will also call compute_modifiers()
5698 java_lang_Class::create_mirror(ik,
5699 Handle(THREAD, _loader_data->class_loader()),
5700 module_handle,
5701 _protection_domain,
5702 CHECK);
5703
5704 assert(_all_mirandas != NULL, "invariant");
5705
5706 // Generate any default methods - default methods are public interface methods
5707 // that have a default implementation. This is new with Java 8.
5708 if (_has_nonstatic_concrete_methods) {
5709 DefaultMethods::generate_default_methods(ik,
5710 _all_mirandas,
5711 CHECK);
5712 }
5713
5714 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5715 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5716 !module_entry->has_default_read_edges()) {
5717 if (!module_entry->set_has_default_read_edges()) {
5718 // We won a potential race
5719 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5720 }
5721 }
5722
5723 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5724
5725 if (!is_internal()) {
5726 if (log_is_enabled(Info, class, load)) {
5727 ResourceMark rm;
5728 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5729 ik->print_class_load_logging(_loader_data, module_name, _stream);
5730 }
5731
5732 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5733 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5734 log_is_enabled(Info, class, preview)) {
5735 ResourceMark rm;
5736 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5737 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5738 }
5739
5740 if (log_is_enabled(Debug, class, resolve)) {
5741 ResourceMark rm;
5742 // print out the superclass.
5743 const char * from = ik->external_name();
5744 if (ik->java_super() != NULL) {
5745 log_debug(class, resolve)("%s %s (super)",
5746 from,
5747 ik->java_super()->external_name());
5748 }
5749 // print out each of the interface classes referred to by this class.
5750 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5751 if (local_interfaces != NULL) {
5752 const int length = local_interfaces->length();
5753 for (int i = 0; i < length; i++) {
5754 const InstanceKlass* const k = local_interfaces->at(i);
5755 const char * to = k->external_name();
5756 log_debug(class, resolve)("%s %s (interface)", from, to);
5757 }
5758 }
5759 }
5760 }
5761
5762 JFR_ONLY(INIT_ID(ik);)
5763
5764 // If we reach here, all is well.
5765 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5766 // in order for it to not be destroyed in the ClassFileParser destructor.
5767 set_klass_to_deallocate(NULL);
5768
5769 // it's official
5770 set_klass(ik);
5771
5772 debug_only(ik->verify();)
5773 }
5774
update_class_name(Symbol * new_class_name)5775 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5776 // Decrement the refcount in the old name, since we're clobbering it.
5777 _class_name->decrement_refcount();
5778
5779 _class_name = new_class_name;
5780 // Increment the refcount of the new name.
5781 // Now the ClassFileParser owns this name and will decrement in
5782 // the destructor.
5783 _class_name->increment_refcount();
5784 }
5785
5786
5787 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's
5788 // package by prepending its host class's package name to its class name and setting
5789 // its _class_name field.
prepend_host_package_name(const InstanceKlass * unsafe_anonymous_host,TRAPS)5790 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) {
5791 ResourceMark rm(THREAD);
5792 assert(strrchr(_class_name->as_C_string(), '/') == NULL,
5793 "Unsafe anonymous class should not be in a package");
5794 const char* host_pkg_name =
5795 ClassLoader::package_from_name(unsafe_anonymous_host->name()->as_C_string(), NULL);
5796
5797 if (host_pkg_name != NULL) {
5798 int host_pkg_len = (int)strlen(host_pkg_name);
5799 int class_name_len = _class_name->utf8_length();
5800 int symbol_len = host_pkg_len + 1 + class_name_len;
5801 char* new_anon_name = NEW_RESOURCE_ARRAY(char, symbol_len + 1);
5802 int n = os::snprintf(new_anon_name, symbol_len + 1, "%s/%.*s",
5803 host_pkg_name, class_name_len, _class_name->base());
5804 assert(n == symbol_len, "Unexpected number of characters in string");
5805
5806 // Decrement old _class_name to avoid leaking.
5807 _class_name->decrement_refcount();
5808
5809 // Create a symbol and update the anonymous class name.
5810 // The new class name is created with a refcount of one. When installed into the InstanceKlass,
5811 // it'll be two and when the ClassFileParser destructor runs, it'll go back to one and get deleted
5812 // when the class is unloaded.
5813 _class_name = SymbolTable::new_symbol(new_anon_name, symbol_len);
5814 }
5815 }
5816
5817 // If the host class and the anonymous class are in the same package then do
5818 // nothing. If the anonymous class is in the unnamed package then move it to its
5819 // host's package. If the classes are in different packages then throw an IAE
5820 // exception.
fix_unsafe_anonymous_class_name(TRAPS)5821 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) {
5822 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class");
5823
5824 const jbyte* anon_last_slash = UTF8::strrchr((const jbyte*)_class_name->base(),
5825 _class_name->utf8_length(), '/');
5826 if (anon_last_slash == NULL) { // Unnamed package
5827 prepend_host_package_name(_unsafe_anonymous_host, CHECK);
5828 } else {
5829 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) {
5830 ResourceMark rm(THREAD);
5831 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
5832 err_msg("Host class %s and anonymous class %s are in different packages",
5833 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string()));
5834 }
5835 }
5836 }
5837
relax_format_check_for(ClassLoaderData * loader_data)5838 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5839 bool trusted = (loader_data->is_the_null_class_loader_data() ||
5840 SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
5841 bool need_verify =
5842 // verifyAll
5843 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5844 // verifyRemote
5845 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5846 return !need_verify;
5847 }
5848
ClassFileParser(ClassFileStream * stream,Symbol * name,ClassLoaderData * loader_data,Handle protection_domain,const InstanceKlass * unsafe_anonymous_host,GrowableArray<Handle> * cp_patches,Publicity pub_level,TRAPS)5849 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5850 Symbol* name,
5851 ClassLoaderData* loader_data,
5852 Handle protection_domain,
5853 const InstanceKlass* unsafe_anonymous_host,
5854 GrowableArray<Handle>* cp_patches,
5855 Publicity pub_level,
5856 TRAPS) :
5857 _stream(stream),
5858 _requested_name(name),
5859 _class_name(NULL),
5860 _loader_data(loader_data),
5861 _unsafe_anonymous_host(unsafe_anonymous_host),
5862 _cp_patches(cp_patches),
5863 _num_patched_klasses(0),
5864 _max_num_patched_klasses(0),
5865 _orig_cp_size(0),
5866 _first_patched_klass_resolved_index(0),
5867 _super_klass(),
5868 _cp(NULL),
5869 _fields(NULL),
5870 _methods(NULL),
5871 _inner_classes(NULL),
5872 _nest_members(NULL),
5873 _nest_host(0),
5874 _local_interfaces(NULL),
5875 _transitive_interfaces(NULL),
5876 _combined_annotations(NULL),
5877 _annotations(NULL),
5878 _type_annotations(NULL),
5879 _fields_annotations(NULL),
5880 _fields_type_annotations(NULL),
5881 _klass(NULL),
5882 _klass_to_deallocate(NULL),
5883 _parsed_annotations(NULL),
5884 _fac(NULL),
5885 _field_info(NULL),
5886 _method_ordering(NULL),
5887 _all_mirandas(NULL),
5888 _vtable_size(0),
5889 _itable_size(0),
5890 _num_miranda_methods(0),
5891 _rt(REF_NONE),
5892 _protection_domain(protection_domain),
5893 _access_flags(),
5894 _pub_level(pub_level),
5895 _bad_constant_seen(0),
5896 _synthetic_flag(false),
5897 _sde_length(false),
5898 _sde_buffer(NULL),
5899 _sourcefile_index(0),
5900 _generic_signature_index(0),
5901 _major_version(0),
5902 _minor_version(0),
5903 _this_class_index(0),
5904 _super_class_index(0),
5905 _itfs_len(0),
5906 _java_fields_count(0),
5907 _need_verify(false),
5908 _relax_verify(false),
5909 _has_nonstatic_concrete_methods(false),
5910 _declares_nonstatic_concrete_methods(false),
5911 _has_final_method(false),
5912 _has_finalizer(false),
5913 _has_empty_finalizer(false),
5914 _has_vanilla_constructor(false),
5915 _max_bootstrap_specifier_index(-1) {
5916
5917 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
5918 _class_name->increment_refcount();
5919
5920 assert(THREAD->is_Java_thread(), "invariant");
5921 assert(_loader_data != NULL, "invariant");
5922 assert(stream != NULL, "invariant");
5923 assert(_stream != NULL, "invariant");
5924 assert(_stream->buffer() == _stream->current(), "invariant");
5925 assert(_class_name != NULL, "invariant");
5926 assert(0 == _access_flags.as_int(), "invariant");
5927
5928 // Figure out whether we can skip format checking (matching classic VM behavior)
5929 if (DumpSharedSpaces) {
5930 // verify == true means it's a 'remote' class (i.e., non-boot class)
5931 // Verification decision is based on BytecodeVerificationRemote flag
5932 // for those classes.
5933 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
5934 BytecodeVerificationLocal;
5935 }
5936 else {
5937 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
5938 stream->need_verify());
5939 }
5940 if (_cp_patches != NULL) {
5941 int len = _cp_patches->length();
5942 for (int i=0; i<len; i++) {
5943 if (has_cp_patch_at(i)) {
5944 Handle patch = cp_patch_at(i);
5945 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
5946 // We need to append the names of the patched classes to the end of the constant pool,
5947 // because a patched class may have a Utf8 name that's not already included in the
5948 // original constant pool. These class names are used when patch_constant_pool()
5949 // calls patch_class().
5950 //
5951 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
5952 // At this point, we don't know the tag for index i yet, because we haven't parsed the
5953 // constant pool. So we can only assume the worst -- every String is used to patch a Class.
5954 _max_num_patched_klasses++;
5955 }
5956 }
5957 }
5958 }
5959
5960 // synch back verification state to stream
5961 stream->set_verify(_need_verify);
5962
5963 // Check if verification needs to be relaxed for this class file
5964 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
5965 _relax_verify = relax_format_check_for(_loader_data);
5966
5967 parse_stream(stream, CHECK);
5968
5969 post_process_parsed_stream(stream, _cp, CHECK);
5970 }
5971
clear_class_metadata()5972 void ClassFileParser::clear_class_metadata() {
5973 // metadata created before the instance klass is created. Must be
5974 // deallocated if classfile parsing returns an error.
5975 _cp = NULL;
5976 _fields = NULL;
5977 _methods = NULL;
5978 _inner_classes = NULL;
5979 _nest_members = NULL;
5980 _local_interfaces = NULL;
5981 _combined_annotations = NULL;
5982 _annotations = _type_annotations = NULL;
5983 _fields_annotations = _fields_type_annotations = NULL;
5984 }
5985
5986 // Destructor to clean up
~ClassFileParser()5987 ClassFileParser::~ClassFileParser() {
5988 _class_name->decrement_refcount();
5989
5990 if (_cp != NULL) {
5991 MetadataFactory::free_metadata(_loader_data, _cp);
5992 }
5993 if (_fields != NULL) {
5994 MetadataFactory::free_array<u2>(_loader_data, _fields);
5995 }
5996
5997 if (_methods != NULL) {
5998 // Free methods
5999 InstanceKlass::deallocate_methods(_loader_data, _methods);
6000 }
6001
6002 // beware of the Universe::empty_blah_array!!
6003 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6004 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6005 }
6006
6007 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
6008 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6009 }
6010
6011 // Free interfaces
6012 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6013 _local_interfaces, _transitive_interfaces);
6014
6015 if (_combined_annotations != NULL) {
6016 // After all annotations arrays have been created, they are installed into the
6017 // Annotations object that will be assigned to the InstanceKlass being created.
6018
6019 // Deallocate the Annotations object and the installed annotations arrays.
6020 _combined_annotations->deallocate_contents(_loader_data);
6021
6022 // If the _combined_annotations pointer is non-NULL,
6023 // then the other annotations fields should have been cleared.
6024 assert(_annotations == NULL, "Should have been cleared");
6025 assert(_type_annotations == NULL, "Should have been cleared");
6026 assert(_fields_annotations == NULL, "Should have been cleared");
6027 assert(_fields_type_annotations == NULL, "Should have been cleared");
6028 } else {
6029 // If the annotations arrays were not installed into the Annotations object,
6030 // then they have to be deallocated explicitly.
6031 MetadataFactory::free_array<u1>(_loader_data, _annotations);
6032 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
6033 Annotations::free_contents(_loader_data, _fields_annotations);
6034 Annotations::free_contents(_loader_data, _fields_type_annotations);
6035 }
6036
6037 clear_class_metadata();
6038 _transitive_interfaces = NULL;
6039
6040 // deallocate the klass if already created. Don't directly deallocate, but add
6041 // to the deallocate list so that the klass is removed from the CLD::_klasses list
6042 // at a safepoint.
6043 if (_klass_to_deallocate != NULL) {
6044 _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6045 }
6046 }
6047
parse_stream(const ClassFileStream * const stream,TRAPS)6048 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6049 TRAPS) {
6050
6051 assert(stream != NULL, "invariant");
6052 assert(_class_name != NULL, "invariant");
6053
6054 // BEGIN STREAM PARSING
6055 stream->guarantee_more(8, CHECK); // magic, major, minor
6056 // Magic value
6057 const u4 magic = stream->get_u4_fast();
6058 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6059 "Incompatible magic value %u in class file %s",
6060 magic, CHECK);
6061
6062 // Version numbers
6063 _minor_version = stream->get_u2_fast();
6064 _major_version = stream->get_u2_fast();
6065
6066 if (DumpSharedSpaces && _major_version < JAVA_6_VERSION) {
6067 ResourceMark rm;
6068 warning("Pre JDK 6 class not supported by CDS: %u.%u %s",
6069 _major_version, _minor_version, _class_name->as_C_string());
6070 Exceptions::fthrow(
6071 THREAD_AND_LOCATION,
6072 vmSymbols::java_lang_UnsupportedClassVersionError(),
6073 "Unsupported major.minor version for dump time %u.%u",
6074 _major_version,
6075 _minor_version);
6076 }
6077
6078 // Check version numbers - we check this even with verifier off
6079 verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6080
6081 stream->guarantee_more(3, CHECK); // length, first cp tag
6082 u2 cp_size = stream->get_u2_fast();
6083
6084 guarantee_property(
6085 cp_size >= 1, "Illegal constant pool size %u in class file %s",
6086 cp_size, CHECK);
6087
6088 _orig_cp_size = cp_size;
6089 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6090 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6091 }
6092 cp_size += _max_num_patched_klasses;
6093
6094 _cp = ConstantPool::allocate(_loader_data,
6095 cp_size,
6096 CHECK);
6097
6098 ConstantPool* const cp = _cp;
6099
6100 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6101
6102 assert(cp_size == (const u2)cp->length(), "invariant");
6103
6104 // ACCESS FLAGS
6105 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6106
6107 // Access flags
6108 jint flags;
6109 // JVM_ACC_MODULE is defined in JDK-9 and later.
6110 if (_major_version >= JAVA_9_VERSION) {
6111 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
6112 } else {
6113 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
6114 }
6115
6116 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6117 // Set abstract bit for old class files for backward compatibility
6118 flags |= JVM_ACC_ABSTRACT;
6119 }
6120
6121 verify_legal_class_modifiers(flags, CHECK);
6122
6123 short bad_constant = class_bad_constant_seen();
6124 if (bad_constant != 0) {
6125 // Do not throw CFE until after the access_flags are checked because if
6126 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6127 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6128 }
6129
6130 _access_flags.set_flags(flags);
6131
6132 // This class and superclass
6133 _this_class_index = stream->get_u2_fast();
6134 check_property(
6135 valid_cp_range(_this_class_index, cp_size) &&
6136 cp->tag_at(_this_class_index).is_unresolved_klass(),
6137 "Invalid this class index %u in constant pool in class file %s",
6138 _this_class_index, CHECK);
6139
6140 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6141 assert(class_name_in_cp != NULL, "class_name can't be null");
6142
6143 // Update _class_name to reflect the name in the constant pool
6144 update_class_name(class_name_in_cp);
6145
6146 // Don't need to check whether this class name is legal or not.
6147 // It has been checked when constant pool is parsed.
6148 // However, make sure it is not an array type.
6149 if (_need_verify) {
6150 guarantee_property(_class_name->char_at(0) != JVM_SIGNATURE_ARRAY,
6151 "Bad class name in class file %s",
6152 CHECK);
6153 }
6154
6155 // Checks if name in class file matches requested name
6156 if (_requested_name != NULL && _requested_name != _class_name) {
6157 ResourceMark rm(THREAD);
6158 Exceptions::fthrow(
6159 THREAD_AND_LOCATION,
6160 vmSymbols::java_lang_NoClassDefFoundError(),
6161 "%s (wrong name: %s)",
6162 _class_name->as_C_string(),
6163 _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6164 );
6165 return;
6166 }
6167
6168 // if this is an anonymous class fix up its name if it's in the unnamed
6169 // package. Otherwise, throw IAE if it is in a different package than
6170 // its host class.
6171 if (_unsafe_anonymous_host != NULL) {
6172 fix_unsafe_anonymous_class_name(CHECK);
6173 }
6174
6175 // Verification prevents us from creating names with dots in them, this
6176 // asserts that that's the case.
6177 assert(is_internal_format(_class_name), "external class name format used internally");
6178
6179 if (!is_internal()) {
6180 LogTarget(Debug, class, preorder) lt;
6181 if (lt.is_enabled()){
6182 ResourceMark rm(THREAD);
6183 LogStream ls(lt);
6184 ls.print("%s", _class_name->as_klass_external_name());
6185 if (stream->source() != NULL) {
6186 ls.print(" source: %s", stream->source());
6187 }
6188 ls.cr();
6189 }
6190
6191 #if INCLUDE_CDS
6192 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6193 if (!ClassLoader::has_jrt_entry()) {
6194 warning("DumpLoadedClassList and CDS are not supported in exploded build");
6195 DumpLoadedClassList = NULL;
6196 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6197 _unsafe_anonymous_host == NULL) {
6198 // Only dump the classes that can be stored into CDS archive.
6199 // Unsafe anonymous classes such as generated LambdaForm classes are also not included.
6200 oop class_loader = _loader_data->class_loader();
6201 ResourceMark rm(THREAD);
6202 bool skip = false;
6203 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6204 // For the boot and platform class loaders, skip classes that are not found in the
6205 // java runtime image, such as those found in the --patch-module entries.
6206 // These classes can't be loaded from the archive during runtime.
6207 if (!stream->from_boot_loader_modules_image() && strncmp(stream->source(), "jrt:", 4) != 0) {
6208 skip = true;
6209 }
6210
6211 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6212 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6213 // as they can be loaded from the archive during runtime.
6214 skip = false;
6215 }
6216 }
6217 if (skip) {
6218 tty->print_cr("skip writing class %s from source %s to classlist file",
6219 _class_name->as_C_string(), stream->source());
6220 } else {
6221 classlist_file->print_cr("%s", _class_name->as_C_string());
6222 classlist_file->flush();
6223 }
6224 }
6225 }
6226 #endif
6227 }
6228
6229 // SUPERKLASS
6230 _super_class_index = stream->get_u2_fast();
6231 _super_klass = parse_super_class(cp,
6232 _super_class_index,
6233 _need_verify,
6234 CHECK);
6235
6236 // Interfaces
6237 _itfs_len = stream->get_u2_fast();
6238 parse_interfaces(stream,
6239 _itfs_len,
6240 cp,
6241 &_has_nonstatic_concrete_methods,
6242 CHECK);
6243
6244 assert(_local_interfaces != NULL, "invariant");
6245
6246 // Fields (offsets are filled in later)
6247 _fac = new FieldAllocationCount();
6248 parse_fields(stream,
6249 _access_flags.is_interface(),
6250 _fac,
6251 cp,
6252 cp_size,
6253 &_java_fields_count,
6254 CHECK);
6255
6256 assert(_fields != NULL, "invariant");
6257
6258 // Methods
6259 AccessFlags promoted_flags;
6260 parse_methods(stream,
6261 _access_flags.is_interface(),
6262 &promoted_flags,
6263 &_has_final_method,
6264 &_declares_nonstatic_concrete_methods,
6265 CHECK);
6266
6267 assert(_methods != NULL, "invariant");
6268
6269 // promote flags from parse_methods() to the klass' flags
6270 _access_flags.add_promoted_flags(promoted_flags.as_int());
6271
6272 if (_declares_nonstatic_concrete_methods) {
6273 _has_nonstatic_concrete_methods = true;
6274 }
6275
6276 // Additional attributes/annotations
6277 _parsed_annotations = new ClassAnnotationCollector();
6278 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6279
6280 assert(_inner_classes != NULL, "invariant");
6281
6282 // Finalize the Annotations metadata object,
6283 // now that all annotation arrays have been created.
6284 create_combined_annotations(CHECK);
6285
6286 // Make sure this is the end of class file stream
6287 guarantee_property(stream->at_eos(),
6288 "Extra bytes at the end of class file %s",
6289 CHECK);
6290
6291 // all bytes in stream read and parsed
6292 }
6293
post_process_parsed_stream(const ClassFileStream * const stream,ConstantPool * cp,TRAPS)6294 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6295 ConstantPool* cp,
6296 TRAPS) {
6297 assert(stream != NULL, "invariant");
6298 assert(stream->at_eos(), "invariant");
6299 assert(cp != NULL, "invariant");
6300 assert(_loader_data != NULL, "invariant");
6301
6302 if (_class_name == vmSymbols::java_lang_Object()) {
6303 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6304 "java.lang.Object cannot implement an interface in class file %s",
6305 CHECK);
6306 }
6307 // We check super class after class file is parsed and format is checked
6308 if (_super_class_index > 0 && NULL ==_super_klass) {
6309 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6310 if (_access_flags.is_interface()) {
6311 // Before attempting to resolve the superclass, check for class format
6312 // errors not checked yet.
6313 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6314 "Interfaces must have java.lang.Object as superclass in class file %s",
6315 CHECK);
6316 }
6317 Handle loader(THREAD, _loader_data->class_loader());
6318 _super_klass = (const InstanceKlass*)
6319 SystemDictionary::resolve_super_or_fail(_class_name,
6320 super_class_name,
6321 loader,
6322 _protection_domain,
6323 true,
6324 CHECK);
6325 }
6326
6327 if (_super_klass != NULL) {
6328 if (_super_klass->has_nonstatic_concrete_methods()) {
6329 _has_nonstatic_concrete_methods = true;
6330 }
6331
6332 if (_super_klass->is_interface()) {
6333 ResourceMark rm(THREAD);
6334 Exceptions::fthrow(
6335 THREAD_AND_LOCATION,
6336 vmSymbols::java_lang_IncompatibleClassChangeError(),
6337 "class %s has interface %s as super class",
6338 _class_name->as_klass_external_name(),
6339 _super_klass->external_name()
6340 );
6341 return;
6342 }
6343 // Make sure super class is not final
6344 if (_super_klass->is_final()) {
6345 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6346 }
6347 }
6348
6349 // Compute the transitive list of all unique interfaces implemented by this class
6350 _transitive_interfaces =
6351 compute_transitive_interfaces(_super_klass,
6352 _local_interfaces,
6353 _loader_data,
6354 CHECK);
6355
6356 assert(_transitive_interfaces != NULL, "invariant");
6357
6358 // sort methods
6359 _method_ordering = sort_methods(_methods);
6360
6361 _all_mirandas = new GrowableArray<Method*>(20);
6362
6363 Handle loader(THREAD, _loader_data->class_loader());
6364 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6365 &_num_miranda_methods,
6366 _all_mirandas,
6367 _super_klass,
6368 _methods,
6369 _access_flags,
6370 _major_version,
6371 loader,
6372 _class_name,
6373 _local_interfaces,
6374 CHECK);
6375
6376 // Size of Java itable (in words)
6377 _itable_size = _access_flags.is_interface() ? 0 :
6378 klassItable::compute_itable_size(_transitive_interfaces);
6379
6380 assert(_fac != NULL, "invariant");
6381 assert(_parsed_annotations != NULL, "invariant");
6382
6383 _field_info = new FieldLayoutInfo();
6384 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6385
6386 // Compute reference typ
6387 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6388
6389 }
6390
set_klass(InstanceKlass * klass)6391 void ClassFileParser::set_klass(InstanceKlass* klass) {
6392
6393 #ifdef ASSERT
6394 if (klass != NULL) {
6395 assert(NULL == _klass, "leaking?");
6396 }
6397 #endif
6398
6399 _klass = klass;
6400 }
6401
set_klass_to_deallocate(InstanceKlass * klass)6402 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6403
6404 #ifdef ASSERT
6405 if (klass != NULL) {
6406 assert(NULL == _klass_to_deallocate, "leaking?");
6407 }
6408 #endif
6409
6410 _klass_to_deallocate = klass;
6411 }
6412
6413 // Caller responsible for ResourceMark
6414 // clone stream with rewound position
clone_stream() const6415 const ClassFileStream* ClassFileParser::clone_stream() const {
6416 assert(_stream != NULL, "invariant");
6417
6418 return _stream->clone();
6419 }
6420 // ----------------------------------------------------------------------------
6421 // debugging
6422
6423 #ifdef ASSERT
6424
6425 // return true if class_name contains no '.' (internal format is '/')
is_internal_format(Symbol * class_name)6426 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6427 if (class_name != NULL) {
6428 ResourceMark rm;
6429 char* name = class_name->as_C_string();
6430 return strchr(name, '.') == NULL;
6431 } else {
6432 return true;
6433 }
6434 }
6435
6436 #endif
6437