Thu, 24 May 2018 17:06:56 +0800
Merge
1 /*
2 * Copyright (c) 1997, 2016, 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 */
25 #include "precompiled.hpp"
26 #include "classfile/classFileParser.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/defaultMethods.hpp"
31 #include "classfile/javaClasses.hpp"
32 #include "classfile/symbolTable.hpp"
33 #include "classfile/systemDictionary.hpp"
34 #if INCLUDE_CDS
35 #include "classfile/systemDictionaryShared.hpp"
36 #endif
37 #include "classfile/verificationType.hpp"
38 #include "classfile/verifier.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "memory/allocation.hpp"
41 #include "memory/gcLocker.hpp"
42 #include "memory/metadataFactory.hpp"
43 #include "memory/oopFactory.hpp"
44 #include "memory/referenceType.hpp"
45 #include "memory/universe.inline.hpp"
46 #include "oops/constantPool.hpp"
47 #include "oops/fieldStreams.hpp"
48 #include "oops/instanceKlass.hpp"
49 #include "oops/instanceMirrorKlass.hpp"
50 #include "oops/klass.inline.hpp"
51 #include "oops/klassVtable.hpp"
52 #include "oops/method.hpp"
53 #include "oops/symbol.hpp"
54 #include "prims/jvm.h"
55 #include "prims/jvmtiExport.hpp"
56 #include "prims/jvmtiThreadState.hpp"
57 #include "runtime/javaCalls.hpp"
58 #include "runtime/perfData.hpp"
59 #include "runtime/reflection.hpp"
60 #include "runtime/signature.hpp"
61 #include "runtime/timer.hpp"
62 #include "services/classLoadingService.hpp"
63 #include "services/threadService.hpp"
64 #include "utilities/array.hpp"
65 #include "utilities/globalDefinitions.hpp"
66 #include "utilities/ostream.hpp"
68 // We generally try to create the oops directly when parsing, rather than
69 // allocating temporary data structures and copying the bytes twice. A
70 // temporary area is only needed when parsing utf8 entries in the constant
71 // pool and when parsing line number tables.
73 // We add assert in debug mode when class format is not checked.
75 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
76 #define JAVA_MIN_SUPPORTED_VERSION 45
77 #define JAVA_MAX_SUPPORTED_VERSION 52
78 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
80 // Used for two backward compatibility reasons:
81 // - to check for new additions to the class file format in JDK1.5
82 // - to check for bug fixes in the format checker in JDK1.5
83 #define JAVA_1_5_VERSION 49
85 // Used for backward compatibility reasons:
86 // - to check for javac bug fixes that happened after 1.5
87 // - also used as the max version when running in jdk6
88 #define JAVA_6_VERSION 50
90 // Used for backward compatibility reasons:
91 // - to check NameAndType_info signatures more aggressively
92 #define JAVA_7_VERSION 51
94 // Extension method support.
95 #define JAVA_8_VERSION 52
97 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) {
98 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
99 // this function (_current can be allocated in a register, with scalar
100 // replacement of aggregates). The _current pointer is copied back to
101 // stream() when this function returns. DON'T call another method within
102 // this method that uses stream().
103 ClassFileStream* cfs0 = stream();
104 ClassFileStream cfs1 = *cfs0;
105 ClassFileStream* cfs = &cfs1;
106 #ifdef ASSERT
107 assert(cfs->allocated_on_stack(),"should be local");
108 u1* old_current = cfs0->current();
109 #endif
110 Handle class_loader(THREAD, _loader_data->class_loader());
112 // Used for batching symbol allocations.
113 const char* names[SymbolTable::symbol_alloc_batch_size];
114 int lengths[SymbolTable::symbol_alloc_batch_size];
115 int indices[SymbolTable::symbol_alloc_batch_size];
116 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
117 int names_count = 0;
119 // parsing Index 0 is unused
120 for (int index = 1; index < length; index++) {
121 // Each of the following case guarantees one more byte in the stream
122 // for the following tag or the access_flags following constant pool,
123 // so we don't need bounds-check for reading tag.
124 u1 tag = cfs->get_u1_fast();
125 switch (tag) {
126 case JVM_CONSTANT_Class :
127 {
128 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
129 u2 name_index = cfs->get_u2_fast();
130 _cp->klass_index_at_put(index, name_index);
131 }
132 break;
133 case JVM_CONSTANT_Fieldref :
134 {
135 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
136 u2 class_index = cfs->get_u2_fast();
137 u2 name_and_type_index = cfs->get_u2_fast();
138 _cp->field_at_put(index, class_index, name_and_type_index);
139 }
140 break;
141 case JVM_CONSTANT_Methodref :
142 {
143 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
144 u2 class_index = cfs->get_u2_fast();
145 u2 name_and_type_index = cfs->get_u2_fast();
146 _cp->method_at_put(index, class_index, name_and_type_index);
147 }
148 break;
149 case JVM_CONSTANT_InterfaceMethodref :
150 {
151 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
152 u2 class_index = cfs->get_u2_fast();
153 u2 name_and_type_index = cfs->get_u2_fast();
154 _cp->interface_method_at_put(index, class_index, name_and_type_index);
155 }
156 break;
157 case JVM_CONSTANT_String :
158 {
159 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
160 u2 string_index = cfs->get_u2_fast();
161 _cp->string_index_at_put(index, string_index);
162 }
163 break;
164 case JVM_CONSTANT_MethodHandle :
165 case JVM_CONSTANT_MethodType :
166 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
167 classfile_parse_error(
168 "Class file version does not support constant tag %u in class file %s",
169 tag, CHECK);
170 }
171 if (!EnableInvokeDynamic) {
172 classfile_parse_error(
173 "This JVM does not support constant tag %u in class file %s",
174 tag, CHECK);
175 }
176 if (tag == JVM_CONSTANT_MethodHandle) {
177 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
178 u1 ref_kind = cfs->get_u1_fast();
179 u2 method_index = cfs->get_u2_fast();
180 _cp->method_handle_index_at_put(index, ref_kind, method_index);
181 } else if (tag == JVM_CONSTANT_MethodType) {
182 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
183 u2 signature_index = cfs->get_u2_fast();
184 _cp->method_type_index_at_put(index, signature_index);
185 } else {
186 ShouldNotReachHere();
187 }
188 break;
189 case JVM_CONSTANT_InvokeDynamic :
190 {
191 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
192 classfile_parse_error(
193 "Class file version does not support constant tag %u in class file %s",
194 tag, CHECK);
195 }
196 if (!EnableInvokeDynamic) {
197 classfile_parse_error(
198 "This JVM does not support constant tag %u in class file %s",
199 tag, CHECK);
200 }
201 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
202 u2 bootstrap_specifier_index = cfs->get_u2_fast();
203 u2 name_and_type_index = cfs->get_u2_fast();
204 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
205 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
206 _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
207 }
208 break;
209 case JVM_CONSTANT_Integer :
210 {
211 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
212 u4 bytes = cfs->get_u4_fast();
213 _cp->int_at_put(index, (jint) bytes);
214 }
215 break;
216 case JVM_CONSTANT_Float :
217 {
218 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
219 u4 bytes = cfs->get_u4_fast();
220 _cp->float_at_put(index, *(jfloat*)&bytes);
221 }
222 break;
223 case JVM_CONSTANT_Long :
224 // A mangled type might cause you to overrun allocated memory
225 guarantee_property(index+1 < length,
226 "Invalid constant pool entry %u in class file %s",
227 index, CHECK);
228 {
229 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
230 u8 bytes = cfs->get_u8_fast();
231 _cp->long_at_put(index, bytes);
232 }
233 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
234 break;
235 case JVM_CONSTANT_Double :
236 // A mangled type might cause you to overrun allocated memory
237 guarantee_property(index+1 < length,
238 "Invalid constant pool entry %u in class file %s",
239 index, CHECK);
240 {
241 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
242 u8 bytes = cfs->get_u8_fast();
243 _cp->double_at_put(index, *(jdouble*)&bytes);
244 }
245 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
246 break;
247 case JVM_CONSTANT_NameAndType :
248 {
249 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
250 u2 name_index = cfs->get_u2_fast();
251 u2 signature_index = cfs->get_u2_fast();
252 _cp->name_and_type_at_put(index, name_index, signature_index);
253 }
254 break;
255 case JVM_CONSTANT_Utf8 :
256 {
257 cfs->guarantee_more(2, CHECK); // utf8_length
258 u2 utf8_length = cfs->get_u2_fast();
259 u1* utf8_buffer = cfs->get_u1_buffer();
260 assert(utf8_buffer != NULL, "null utf8 buffer");
261 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
262 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
263 cfs->skip_u1_fast(utf8_length);
265 // Before storing the symbol, make sure it's legal
266 if (_need_verify) {
267 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
268 }
270 if (EnableInvokeDynamic && has_cp_patch_at(index)) {
271 Handle patch = clear_cp_patch_at(index);
272 guarantee_property(java_lang_String::is_instance(patch()),
273 "Illegal utf8 patch at %d in class file %s",
274 index, CHECK);
275 char* str = java_lang_String::as_utf8_string(patch());
276 // (could use java_lang_String::as_symbol instead, but might as well batch them)
277 utf8_buffer = (u1*) str;
278 utf8_length = (int) strlen(str);
279 }
281 unsigned int hash;
282 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
283 if (result == NULL) {
284 names[names_count] = (char*)utf8_buffer;
285 lengths[names_count] = utf8_length;
286 indices[names_count] = index;
287 hashValues[names_count++] = hash;
288 if (names_count == SymbolTable::symbol_alloc_batch_size) {
289 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
290 names_count = 0;
291 }
292 } else {
293 _cp->symbol_at_put(index, result);
294 }
295 }
296 break;
297 default:
298 classfile_parse_error(
299 "Unknown constant tag %u in class file %s", tag, CHECK);
300 break;
301 }
302 }
304 // Allocate the remaining symbols
305 if (names_count > 0) {
306 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
307 }
309 // Copy _current pointer of local copy back to stream().
310 #ifdef ASSERT
311 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
312 #endif
313 cfs0->set_current(cfs1.current());
314 }
316 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
318 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) {
319 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8())
320 return cp->symbol_at(index);
321 else
322 return NULL;
323 }
325 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
326 ClassFileStream* cfs = stream();
327 constantPoolHandle nullHandle;
329 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
330 u2 length = cfs->get_u2_fast();
331 guarantee_property(
332 length >= 1, "Illegal constant pool size %u in class file %s",
333 length, CHECK_(nullHandle));
334 ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length,
335 CHECK_(nullHandle));
336 _cp = constant_pool; // save in case of errors
337 constantPoolHandle cp (THREAD, constant_pool);
339 // parsing constant pool entries
340 parse_constant_pool_entries(length, CHECK_(nullHandle));
342 int index = 1; // declared outside of loops for portability
344 // first verification pass - validate cross references and fixup class and string constants
345 for (index = 1; index < length; index++) { // Index 0 is unused
346 jbyte tag = cp->tag_at(index).value();
347 switch (tag) {
348 case JVM_CONSTANT_Class :
349 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
350 break;
351 case JVM_CONSTANT_Fieldref :
352 // fall through
353 case JVM_CONSTANT_Methodref :
354 // fall through
355 case JVM_CONSTANT_InterfaceMethodref : {
356 if (!_need_verify) break;
357 int klass_ref_index = cp->klass_ref_index_at(index);
358 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
359 check_property(valid_klass_reference_at(klass_ref_index),
360 "Invalid constant pool index %u in class file %s",
361 klass_ref_index,
362 CHECK_(nullHandle));
363 check_property(valid_cp_range(name_and_type_ref_index, length) &&
364 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
365 "Invalid constant pool index %u in class file %s",
366 name_and_type_ref_index,
367 CHECK_(nullHandle));
368 break;
369 }
370 case JVM_CONSTANT_String :
371 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
372 break;
373 case JVM_CONSTANT_Integer :
374 break;
375 case JVM_CONSTANT_Float :
376 break;
377 case JVM_CONSTANT_Long :
378 case JVM_CONSTANT_Double :
379 index++;
380 check_property(
381 (index < length && cp->tag_at(index).is_invalid()),
382 "Improper constant pool long/double index %u in class file %s",
383 index, CHECK_(nullHandle));
384 break;
385 case JVM_CONSTANT_NameAndType : {
386 if (!_need_verify) break;
387 int name_ref_index = cp->name_ref_index_at(index);
388 int signature_ref_index = cp->signature_ref_index_at(index);
389 check_property(valid_symbol_at(name_ref_index),
390 "Invalid constant pool index %u in class file %s",
391 name_ref_index, CHECK_(nullHandle));
392 check_property(valid_symbol_at(signature_ref_index),
393 "Invalid constant pool index %u in class file %s",
394 signature_ref_index, CHECK_(nullHandle));
395 break;
396 }
397 case JVM_CONSTANT_Utf8 :
398 break;
399 case JVM_CONSTANT_UnresolvedClass : // fall-through
400 case JVM_CONSTANT_UnresolvedClassInError:
401 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
402 break;
403 case JVM_CONSTANT_ClassIndex :
404 {
405 int class_index = cp->klass_index_at(index);
406 check_property(valid_symbol_at(class_index),
407 "Invalid constant pool index %u in class file %s",
408 class_index, CHECK_(nullHandle));
409 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
410 }
411 break;
412 case JVM_CONSTANT_StringIndex :
413 {
414 int string_index = cp->string_index_at(index);
415 check_property(valid_symbol_at(string_index),
416 "Invalid constant pool index %u in class file %s",
417 string_index, CHECK_(nullHandle));
418 Symbol* sym = cp->symbol_at(string_index);
419 cp->unresolved_string_at_put(index, sym);
420 }
421 break;
422 case JVM_CONSTANT_MethodHandle :
423 {
424 int ref_index = cp->method_handle_index_at(index);
425 check_property(
426 valid_cp_range(ref_index, length) &&
427 EnableInvokeDynamic,
428 "Invalid constant pool index %u in class file %s",
429 ref_index, CHECK_(nullHandle));
430 constantTag tag = cp->tag_at(ref_index);
431 int ref_kind = cp->method_handle_ref_kind_at(index);
432 switch (ref_kind) {
433 case JVM_REF_getField:
434 case JVM_REF_getStatic:
435 case JVM_REF_putField:
436 case JVM_REF_putStatic:
437 check_property(
438 tag.is_field(),
439 "Invalid constant pool index %u in class file %s (not a field)",
440 ref_index, CHECK_(nullHandle));
441 break;
442 case JVM_REF_invokeVirtual:
443 case JVM_REF_newInvokeSpecial:
444 check_property(
445 tag.is_method(),
446 "Invalid constant pool index %u in class file %s (not a method)",
447 ref_index, CHECK_(nullHandle));
448 break;
449 case JVM_REF_invokeStatic:
450 case JVM_REF_invokeSpecial:
451 check_property(tag.is_method() ||
452 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
453 "Invalid constant pool index %u in class file %s (not a method)",
454 ref_index, CHECK_(nullHandle));
455 break;
456 case JVM_REF_invokeInterface:
457 check_property(
458 tag.is_interface_method(),
459 "Invalid constant pool index %u in class file %s (not an interface method)",
460 ref_index, CHECK_(nullHandle));
461 break;
462 default:
463 classfile_parse_error(
464 "Bad method handle kind at constant pool index %u in class file %s",
465 index, CHECK_(nullHandle));
466 }
467 // Keep the ref_index unchanged. It will be indirected at link-time.
468 }
469 break;
470 case JVM_CONSTANT_MethodType :
471 {
472 int ref_index = cp->method_type_index_at(index);
473 check_property(valid_symbol_at(ref_index) && EnableInvokeDynamic,
474 "Invalid constant pool index %u in class file %s",
475 ref_index, CHECK_(nullHandle));
476 }
477 break;
478 case JVM_CONSTANT_InvokeDynamic :
479 {
480 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
481 check_property(valid_cp_range(name_and_type_ref_index, length) &&
482 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
483 "Invalid constant pool index %u in class file %s",
484 name_and_type_ref_index,
485 CHECK_(nullHandle));
486 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
487 break;
488 }
489 default:
490 fatal(err_msg("bad constant pool tag value %u",
491 cp->tag_at(index).value()));
492 ShouldNotReachHere();
493 break;
494 } // end of switch
495 } // end of for
497 if (_cp_patches != NULL) {
498 // need to treat this_class specially...
499 assert(EnableInvokeDynamic, "");
500 int this_class_index;
501 {
502 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
503 u1* mark = cfs->current();
504 u2 flags = cfs->get_u2_fast();
505 this_class_index = cfs->get_u2_fast();
506 cfs->set_current(mark); // revert to mark
507 }
509 for (index = 1; index < length; index++) { // Index 0 is unused
510 if (has_cp_patch_at(index)) {
511 guarantee_property(index != this_class_index,
512 "Illegal constant pool patch to self at %d in class file %s",
513 index, CHECK_(nullHandle));
514 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
515 }
516 }
517 }
519 if (!_need_verify) {
520 return cp;
521 }
523 // second verification pass - checks the strings are of the right format.
524 // but not yet to the other entries
525 for (index = 1; index < length; index++) {
526 jbyte tag = cp->tag_at(index).value();
527 switch (tag) {
528 case JVM_CONSTANT_UnresolvedClass: {
529 Symbol* class_name = cp->unresolved_klass_at(index);
530 // check the name, even if _cp_patches will overwrite it
531 verify_legal_class_name(class_name, CHECK_(nullHandle));
532 break;
533 }
534 case JVM_CONSTANT_NameAndType: {
535 if (_need_verify && _major_version >= JAVA_7_VERSION) {
536 int sig_index = cp->signature_ref_index_at(index);
537 int name_index = cp->name_ref_index_at(index);
538 Symbol* name = cp->symbol_at(name_index);
539 Symbol* sig = cp->symbol_at(sig_index);
540 guarantee_property(sig->utf8_length() != 0,
541 "Illegal zero length constant pool entry at %d in class %s",
542 sig_index, CHECK_(nullHandle));
543 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
544 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
545 } else {
546 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
547 }
548 }
549 break;
550 }
551 case JVM_CONSTANT_InvokeDynamic:
552 case JVM_CONSTANT_Fieldref:
553 case JVM_CONSTANT_Methodref:
554 case JVM_CONSTANT_InterfaceMethodref: {
555 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
556 // already verified to be utf8
557 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
558 // already verified to be utf8
559 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
560 Symbol* name = cp->symbol_at(name_ref_index);
561 Symbol* signature = cp->symbol_at(signature_ref_index);
562 if (tag == JVM_CONSTANT_Fieldref) {
563 verify_legal_field_name(name, CHECK_(nullHandle));
564 if (_need_verify && _major_version >= JAVA_7_VERSION) {
565 // Signature is verified above, when iterating NameAndType_info.
566 // Need only to be sure it's non-zero length and the right type.
567 if (signature->utf8_length() == 0 ||
568 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
569 throwIllegalSignature(
570 "Field", name, signature, CHECK_(nullHandle));
571 }
572 } else {
573 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
574 }
575 } else {
576 verify_legal_method_name(name, CHECK_(nullHandle));
577 if (_need_verify && _major_version >= JAVA_7_VERSION) {
578 // Signature is verified above, when iterating NameAndType_info.
579 // Need only to be sure it's non-zero length and the right type.
580 if (signature->utf8_length() == 0 ||
581 signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
582 throwIllegalSignature(
583 "Method", name, signature, CHECK_(nullHandle));
584 }
585 } else {
586 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
587 }
588 if (tag == JVM_CONSTANT_Methodref) {
589 // 4509014: If a class method name begins with '<', it must be "<init>".
590 assert(name != NULL, "method name in constant pool is null");
591 unsigned int name_len = name->utf8_length();
592 if (name_len != 0 && name->byte_at(0) == '<') {
593 if (name != vmSymbols::object_initializer_name()) {
594 classfile_parse_error(
595 "Bad method name at constant pool index %u in class file %s",
596 name_ref_index, CHECK_(nullHandle));
597 }
598 }
599 }
600 }
601 break;
602 }
603 case JVM_CONSTANT_MethodHandle: {
604 int ref_index = cp->method_handle_index_at(index);
605 int ref_kind = cp->method_handle_ref_kind_at(index);
606 switch (ref_kind) {
607 case JVM_REF_invokeVirtual:
608 case JVM_REF_invokeStatic:
609 case JVM_REF_invokeSpecial:
610 case JVM_REF_newInvokeSpecial:
611 {
612 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
613 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
614 Symbol* name = cp->symbol_at(name_ref_index);
615 if (ref_kind == JVM_REF_newInvokeSpecial) {
616 if (name != vmSymbols::object_initializer_name()) {
617 classfile_parse_error(
618 "Bad constructor name at constant pool index %u in class file %s",
619 name_ref_index, CHECK_(nullHandle));
620 }
621 } else {
622 if (name == vmSymbols::object_initializer_name()) {
623 classfile_parse_error(
624 "Bad method name at constant pool index %u in class file %s",
625 name_ref_index, CHECK_(nullHandle));
626 }
627 }
628 }
629 break;
630 // Other ref_kinds are already fully checked in previous pass.
631 }
632 break;
633 }
634 case JVM_CONSTANT_MethodType: {
635 Symbol* no_name = vmSymbols::type_name(); // place holder
636 Symbol* signature = cp->method_type_signature_at(index);
637 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
638 break;
639 }
640 case JVM_CONSTANT_Utf8: {
641 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
642 }
643 } // end of switch
644 } // end of for
646 return cp;
647 }
650 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
651 assert(EnableInvokeDynamic, "");
652 BasicType patch_type = T_VOID;
654 switch (cp->tag_at(index).value()) {
656 case JVM_CONSTANT_UnresolvedClass :
657 // Patching a class means pre-resolving it.
658 // The name in the constant pool is ignored.
659 if (java_lang_Class::is_instance(patch())) {
660 guarantee_property(!java_lang_Class::is_primitive(patch()),
661 "Illegal class patch at %d in class file %s",
662 index, CHECK);
663 cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
664 } else {
665 guarantee_property(java_lang_String::is_instance(patch()),
666 "Illegal class patch at %d in class file %s",
667 index, CHECK);
668 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
669 cp->unresolved_klass_at_put(index, name);
670 }
671 break;
673 case JVM_CONSTANT_String :
674 // skip this patch and don't clear it. Needs the oop array for resolved
675 // references to be created first.
676 return;
678 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
679 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
680 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
681 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
682 patch_prim:
683 {
684 jvalue value;
685 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
686 guarantee_property(value_type == patch_type,
687 "Illegal primitive patch at %d in class file %s",
688 index, CHECK);
689 switch (value_type) {
690 case T_INT: cp->int_at_put(index, value.i); break;
691 case T_FLOAT: cp->float_at_put(index, value.f); break;
692 case T_LONG: cp->long_at_put(index, value.j); break;
693 case T_DOUBLE: cp->double_at_put(index, value.d); break;
694 default: assert(false, "");
695 }
696 }
697 break;
699 default:
700 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
701 guarantee_property(!has_cp_patch_at(index),
702 "Illegal unexpected patch at %d in class file %s",
703 index, CHECK);
704 return;
705 }
707 // On fall-through, mark the patch as used.
708 clear_cp_patch_at(index);
709 }
713 class NameSigHash: public ResourceObj {
714 public:
715 Symbol* _name; // name
716 Symbol* _sig; // signature
717 NameSigHash* _next; // Next entry in hash table
718 };
721 #define HASH_ROW_SIZE 256
723 unsigned int hash(Symbol* name, Symbol* sig) {
724 unsigned int raw_hash = 0;
725 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
726 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
728 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
729 }
732 void initialize_hashtable(NameSigHash** table) {
733 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
734 }
736 // Return false if the name/sig combination is found in table.
737 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
738 // The old format checker uses heap sort to find duplicates.
739 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
740 // of table since we don't expect Symbol*'s to move.
741 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
742 assert(name != NULL, "name in constant pool is NULL");
744 // First lookup for duplicates
745 int index = hash(name, sig);
746 NameSigHash* entry = table[index];
747 while (entry != NULL) {
748 if (entry->_name == name && entry->_sig == sig) {
749 return false;
750 }
751 entry = entry->_next;
752 }
754 // No duplicate is found, allocate a new entry and fill it.
755 entry = new NameSigHash();
756 entry->_name = name;
757 entry->_sig = sig;
759 // Insert into hash table
760 entry->_next = table[index];
761 table[index] = entry;
763 return true;
764 }
767 Array<Klass*>* ClassFileParser::parse_interfaces(int length,
768 Handle protection_domain,
769 Symbol* class_name,
770 bool* has_default_methods,
771 TRAPS) {
772 if (length == 0) {
773 _local_interfaces = Universe::the_empty_klass_array();
774 } else {
775 ClassFileStream* cfs = stream();
776 assert(length > 0, "only called for length>0");
777 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL);
779 int index;
780 for (index = 0; index < length; index++) {
781 u2 interface_index = cfs->get_u2(CHECK_NULL);
782 KlassHandle interf;
783 check_property(
784 valid_klass_reference_at(interface_index),
785 "Interface name has bad constant pool index %u in class file %s",
786 interface_index, CHECK_NULL);
787 if (_cp->tag_at(interface_index).is_klass()) {
788 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index));
789 } else {
790 Symbol* unresolved_klass = _cp->klass_name_at(interface_index);
792 // Don't need to check legal name because it's checked when parsing constant pool.
793 // But need to make sure it's not an array type.
794 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
795 "Bad interface name in class file %s", CHECK_NULL);
796 Handle class_loader(THREAD, _loader_data->class_loader());
798 // Call resolve_super so classcircularity is checked
799 Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
800 unresolved_klass, class_loader, protection_domain,
801 false, CHECK_NULL);
802 interf = KlassHandle(THREAD, k);
803 }
805 if (!interf()->is_interface()) {
806 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
807 }
808 if (InstanceKlass::cast(interf())->has_default_methods()) {
809 *has_default_methods = true;
810 }
811 _local_interfaces->at_put(index, interf());
812 }
814 if (!_need_verify || length <= 1) {
815 return _local_interfaces;
816 }
818 // Check if there's any duplicates in interfaces
819 ResourceMark rm(THREAD);
820 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
821 THREAD, NameSigHash*, HASH_ROW_SIZE);
822 initialize_hashtable(interface_names);
823 bool dup = false;
824 {
825 debug_only(No_Safepoint_Verifier nsv;)
826 for (index = 0; index < length; index++) {
827 Klass* k = _local_interfaces->at(index);
828 Symbol* name = InstanceKlass::cast(k)->name();
829 // If no duplicates, add (name, NULL) in hashtable interface_names.
830 if (!put_after_lookup(name, NULL, interface_names)) {
831 dup = true;
832 break;
833 }
834 }
835 }
836 if (dup) {
837 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL);
838 }
839 }
840 return _local_interfaces;
841 }
844 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) {
845 // Make sure the constant pool entry is of a type appropriate to this field
846 guarantee_property(
847 (constantvalue_index > 0 &&
848 constantvalue_index < _cp->length()),
849 "Bad initial value index %u in ConstantValue attribute in class file %s",
850 constantvalue_index, CHECK);
851 constantTag value_type = _cp->tag_at(constantvalue_index);
852 switch ( _cp->basic_type_for_signature_at(signature_index) ) {
853 case T_LONG:
854 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
855 break;
856 case T_FLOAT:
857 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
858 break;
859 case T_DOUBLE:
860 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
861 break;
862 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
863 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
864 break;
865 case T_OBJECT:
866 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
867 && value_type.is_string()),
868 "Bad string initial value in class file %s", CHECK);
869 break;
870 default:
871 classfile_parse_error(
872 "Unable to set initial value %u in class file %s",
873 constantvalue_index, CHECK);
874 }
875 }
878 // Parse attributes for a field.
879 void ClassFileParser::parse_field_attributes(u2 attributes_count,
880 bool is_static, u2 signature_index,
881 u2* constantvalue_index_addr,
882 bool* is_synthetic_addr,
883 u2* generic_signature_index_addr,
884 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
885 TRAPS) {
886 ClassFileStream* cfs = stream();
887 assert(attributes_count > 0, "length should be greater than 0");
888 u2 constantvalue_index = 0;
889 u2 generic_signature_index = 0;
890 bool is_synthetic = false;
891 u1* runtime_visible_annotations = NULL;
892 int runtime_visible_annotations_length = 0;
893 u1* runtime_invisible_annotations = NULL;
894 int runtime_invisible_annotations_length = 0;
895 u1* runtime_visible_type_annotations = NULL;
896 int runtime_visible_type_annotations_length = 0;
897 u1* runtime_invisible_type_annotations = NULL;
898 int runtime_invisible_type_annotations_length = 0;
899 bool runtime_invisible_type_annotations_exists = false;
900 while (attributes_count--) {
901 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
902 u2 attribute_name_index = cfs->get_u2_fast();
903 u4 attribute_length = cfs->get_u4_fast();
904 check_property(valid_symbol_at(attribute_name_index),
905 "Invalid field attribute index %u in class file %s",
906 attribute_name_index,
907 CHECK);
908 Symbol* attribute_name = _cp->symbol_at(attribute_name_index);
909 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
910 // ignore if non-static
911 if (constantvalue_index != 0) {
912 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
913 }
914 check_property(
915 attribute_length == 2,
916 "Invalid ConstantValue field attribute length %u in class file %s",
917 attribute_length, CHECK);
918 constantvalue_index = cfs->get_u2(CHECK);
919 if (_need_verify) {
920 verify_constantvalue(constantvalue_index, signature_index, CHECK);
921 }
922 } else if (attribute_name == vmSymbols::tag_synthetic()) {
923 if (attribute_length != 0) {
924 classfile_parse_error(
925 "Invalid Synthetic field attribute length %u in class file %s",
926 attribute_length, CHECK);
927 }
928 is_synthetic = true;
929 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
930 if (attribute_length != 0) {
931 classfile_parse_error(
932 "Invalid Deprecated field attribute length %u in class file %s",
933 attribute_length, CHECK);
934 }
935 } else if (_major_version >= JAVA_1_5_VERSION) {
936 if (attribute_name == vmSymbols::tag_signature()) {
937 if (attribute_length != 2) {
938 classfile_parse_error(
939 "Wrong size %u for field's Signature attribute in class file %s",
940 attribute_length, CHECK);
941 }
942 generic_signature_index = parse_generic_signature_attribute(CHECK);
943 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
944 runtime_visible_annotations_length = attribute_length;
945 runtime_visible_annotations = cfs->get_u1_buffer();
946 assert(runtime_visible_annotations != NULL, "null visible annotations");
947 parse_annotations(runtime_visible_annotations,
948 runtime_visible_annotations_length,
949 parsed_annotations,
950 CHECK);
951 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
952 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
953 runtime_invisible_annotations_length = attribute_length;
954 runtime_invisible_annotations = cfs->get_u1_buffer();
955 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
956 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
957 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
958 if (runtime_visible_type_annotations != NULL) {
959 classfile_parse_error(
960 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
961 }
962 runtime_visible_type_annotations_length = attribute_length;
963 runtime_visible_type_annotations = cfs->get_u1_buffer();
964 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
965 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
966 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
967 if (runtime_invisible_type_annotations_exists) {
968 classfile_parse_error(
969 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
970 } else {
971 runtime_invisible_type_annotations_exists = true;
972 }
973 if (PreserveAllAnnotations) {
974 runtime_invisible_type_annotations_length = attribute_length;
975 runtime_invisible_type_annotations = cfs->get_u1_buffer();
976 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
977 }
978 cfs->skip_u1(attribute_length, CHECK);
979 } else {
980 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
981 }
982 } else {
983 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
984 }
985 }
987 *constantvalue_index_addr = constantvalue_index;
988 *is_synthetic_addr = is_synthetic;
989 *generic_signature_index_addr = generic_signature_index;
990 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
991 runtime_visible_annotations_length,
992 runtime_invisible_annotations,
993 runtime_invisible_annotations_length,
994 CHECK);
995 parsed_annotations->set_field_annotations(a);
996 a = assemble_annotations(runtime_visible_type_annotations,
997 runtime_visible_type_annotations_length,
998 runtime_invisible_type_annotations,
999 runtime_invisible_type_annotations_length,
1000 CHECK);
1001 parsed_annotations->set_field_type_annotations(a);
1002 return;
1003 }
1006 // Field allocation types. Used for computing field offsets.
1008 enum FieldAllocationType {
1009 STATIC_OOP, // Oops
1010 STATIC_BYTE, // Boolean, Byte, char
1011 STATIC_SHORT, // shorts
1012 STATIC_WORD, // ints
1013 STATIC_DOUBLE, // aligned long or double
1014 NONSTATIC_OOP,
1015 NONSTATIC_BYTE,
1016 NONSTATIC_SHORT,
1017 NONSTATIC_WORD,
1018 NONSTATIC_DOUBLE,
1019 MAX_FIELD_ALLOCATION_TYPE,
1020 BAD_ALLOCATION_TYPE = -1
1021 };
1023 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1024 BAD_ALLOCATION_TYPE, // 0
1025 BAD_ALLOCATION_TYPE, // 1
1026 BAD_ALLOCATION_TYPE, // 2
1027 BAD_ALLOCATION_TYPE, // 3
1028 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1029 NONSTATIC_SHORT, // T_CHAR = 5,
1030 NONSTATIC_WORD, // T_FLOAT = 6,
1031 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1032 NONSTATIC_BYTE, // T_BYTE = 8,
1033 NONSTATIC_SHORT, // T_SHORT = 9,
1034 NONSTATIC_WORD, // T_INT = 10,
1035 NONSTATIC_DOUBLE, // T_LONG = 11,
1036 NONSTATIC_OOP, // T_OBJECT = 12,
1037 NONSTATIC_OOP, // T_ARRAY = 13,
1038 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1039 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1040 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1041 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1042 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1043 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1044 BAD_ALLOCATION_TYPE, // 0
1045 BAD_ALLOCATION_TYPE, // 1
1046 BAD_ALLOCATION_TYPE, // 2
1047 BAD_ALLOCATION_TYPE, // 3
1048 STATIC_BYTE , // T_BOOLEAN = 4,
1049 STATIC_SHORT, // T_CHAR = 5,
1050 STATIC_WORD, // T_FLOAT = 6,
1051 STATIC_DOUBLE, // T_DOUBLE = 7,
1052 STATIC_BYTE, // T_BYTE = 8,
1053 STATIC_SHORT, // T_SHORT = 9,
1054 STATIC_WORD, // T_INT = 10,
1055 STATIC_DOUBLE, // T_LONG = 11,
1056 STATIC_OOP, // T_OBJECT = 12,
1057 STATIC_OOP, // T_ARRAY = 13,
1058 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1059 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1060 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1061 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1062 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1063 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1064 };
1066 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1067 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1068 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1069 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1070 return result;
1071 }
1073 class FieldAllocationCount: public ResourceObj {
1074 public:
1075 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1077 FieldAllocationCount() {
1078 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1079 count[i] = 0;
1080 }
1081 }
1083 FieldAllocationType update(bool is_static, BasicType type) {
1084 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1085 // Make sure there is no overflow with injected fields.
1086 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1087 count[atype]++;
1088 return atype;
1089 }
1090 };
1092 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name,
1093 bool is_interface,
1094 FieldAllocationCount *fac,
1095 u2* java_fields_count_ptr, TRAPS) {
1096 ClassFileStream* cfs = stream();
1097 cfs->guarantee_more(2, CHECK_NULL); // length
1098 u2 length = cfs->get_u2_fast();
1099 *java_fields_count_ptr = length;
1101 int num_injected = 0;
1102 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1103 int total_fields = length + num_injected;
1105 // The field array starts with tuples of shorts
1106 // [access, name index, sig index, initial value index, byte offset].
1107 // A generic signature slot only exists for field with generic
1108 // signature attribute. And the access flag is set with
1109 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1110 // signature slots are at the end of the field array and after all
1111 // other fields data.
1112 //
1113 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1114 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1115 // ...
1116 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1117 // [generic signature index]
1118 // [generic signature index]
1119 // ...
1120 //
1121 // Allocate a temporary resource array for field data. For each field,
1122 // a slot is reserved in the temporary array for the generic signature
1123 // index. After parsing all fields, the data are copied to a permanent
1124 // array and any unused slots will be discarded.
1125 ResourceMark rm(THREAD);
1126 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1127 THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1129 // The generic signature slots start after all other fields' data.
1130 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1131 int num_generic_signature = 0;
1132 for (int n = 0; n < length; n++) {
1133 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count
1135 AccessFlags access_flags;
1136 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1137 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1138 access_flags.set_flags(flags);
1140 u2 name_index = cfs->get_u2_fast();
1141 int cp_size = _cp->length();
1142 check_property(valid_symbol_at(name_index),
1143 "Invalid constant pool index %u for field name in class file %s",
1144 name_index,
1145 CHECK_NULL);
1146 Symbol* name = _cp->symbol_at(name_index);
1147 verify_legal_field_name(name, CHECK_NULL);
1149 u2 signature_index = cfs->get_u2_fast();
1150 check_property(valid_symbol_at(signature_index),
1151 "Invalid constant pool index %u for field signature in class file %s",
1152 signature_index, CHECK_NULL);
1153 Symbol* sig = _cp->symbol_at(signature_index);
1154 verify_legal_field_signature(name, sig, CHECK_NULL);
1156 u2 constantvalue_index = 0;
1157 bool is_synthetic = false;
1158 u2 generic_signature_index = 0;
1159 bool is_static = access_flags.is_static();
1160 FieldAnnotationCollector parsed_annotations(_loader_data);
1162 u2 attributes_count = cfs->get_u2_fast();
1163 if (attributes_count > 0) {
1164 parse_field_attributes(attributes_count, is_static, signature_index,
1165 &constantvalue_index, &is_synthetic,
1166 &generic_signature_index, &parsed_annotations,
1167 CHECK_NULL);
1168 if (parsed_annotations.field_annotations() != NULL) {
1169 if (_fields_annotations == NULL) {
1170 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1171 _loader_data, length, NULL,
1172 CHECK_NULL);
1173 }
1174 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1175 parsed_annotations.set_field_annotations(NULL);
1176 }
1177 if (parsed_annotations.field_type_annotations() != NULL) {
1178 if (_fields_type_annotations == NULL) {
1179 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1180 _loader_data, length, NULL,
1181 CHECK_NULL);
1182 }
1183 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1184 parsed_annotations.set_field_type_annotations(NULL);
1185 }
1187 if (is_synthetic) {
1188 access_flags.set_is_synthetic();
1189 }
1190 if (generic_signature_index != 0) {
1191 access_flags.set_field_has_generic_signature();
1192 fa[generic_signature_slot] = generic_signature_index;
1193 generic_signature_slot ++;
1194 num_generic_signature ++;
1195 }
1196 }
1198 FieldInfo* field = FieldInfo::from_field_array(fa, n);
1199 field->initialize(access_flags.as_short(),
1200 name_index,
1201 signature_index,
1202 constantvalue_index);
1203 BasicType type = _cp->basic_type_for_signature_at(signature_index);
1205 // Remember how many oops we encountered and compute allocation type
1206 FieldAllocationType atype = fac->update(is_static, type);
1207 field->set_allocation_type(atype);
1209 // After field is initialized with type, we can augment it with aux info
1210 if (parsed_annotations.has_any_annotations())
1211 parsed_annotations.apply_to(field);
1212 }
1214 int index = length;
1215 if (num_injected != 0) {
1216 for (int n = 0; n < num_injected; n++) {
1217 // Check for duplicates
1218 if (injected[n].may_be_java) {
1219 Symbol* name = injected[n].name();
1220 Symbol* signature = injected[n].signature();
1221 bool duplicate = false;
1222 for (int i = 0; i < length; i++) {
1223 FieldInfo* f = FieldInfo::from_field_array(fa, i);
1224 if (name == _cp->symbol_at(f->name_index()) &&
1225 signature == _cp->symbol_at(f->signature_index())) {
1226 // Symbol is desclared in Java so skip this one
1227 duplicate = true;
1228 break;
1229 }
1230 }
1231 if (duplicate) {
1232 // These will be removed from the field array at the end
1233 continue;
1234 }
1235 }
1237 // Injected field
1238 FieldInfo* field = FieldInfo::from_field_array(fa, index);
1239 field->initialize(JVM_ACC_FIELD_INTERNAL,
1240 injected[n].name_index,
1241 injected[n].signature_index,
1242 0);
1244 BasicType type = FieldType::basic_type(injected[n].signature());
1246 // Remember how many oops we encountered and compute allocation type
1247 FieldAllocationType atype = fac->update(false, type);
1248 field->set_allocation_type(atype);
1249 index++;
1250 }
1251 }
1253 // Now copy the fields' data from the temporary resource array.
1254 // Sometimes injected fields already exist in the Java source so
1255 // the fields array could be too long. In that case the
1256 // fields array is trimed. Also unused slots that were reserved
1257 // for generic signature indexes are discarded.
1258 Array<u2>* fields = MetadataFactory::new_array<u2>(
1259 _loader_data, index * FieldInfo::field_slots + num_generic_signature,
1260 CHECK_NULL);
1261 _fields = fields; // save in case of error
1262 {
1263 int i = 0;
1264 for (; i < index * FieldInfo::field_slots; i++) {
1265 fields->at_put(i, fa[i]);
1266 }
1267 for (int j = total_fields * FieldInfo::field_slots;
1268 j < generic_signature_slot; j++) {
1269 fields->at_put(i++, fa[j]);
1270 }
1271 assert(i == fields->length(), "");
1272 }
1274 if (_need_verify && length > 1) {
1275 // Check duplicated fields
1276 ResourceMark rm(THREAD);
1277 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1278 THREAD, NameSigHash*, HASH_ROW_SIZE);
1279 initialize_hashtable(names_and_sigs);
1280 bool dup = false;
1281 {
1282 debug_only(No_Safepoint_Verifier nsv;)
1283 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) {
1284 Symbol* name = fs.name();
1285 Symbol* sig = fs.signature();
1286 // If no duplicates, add name/signature in hashtable names_and_sigs.
1287 if (!put_after_lookup(name, sig, names_and_sigs)) {
1288 dup = true;
1289 break;
1290 }
1291 }
1292 }
1293 if (dup) {
1294 classfile_parse_error("Duplicate field name&signature in class file %s",
1295 CHECK_NULL);
1296 }
1297 }
1299 return fields;
1300 }
1303 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1304 while (length-- > 0) {
1305 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1306 }
1307 }
1310 u2* ClassFileParser::parse_exception_table(u4 code_length,
1311 u4 exception_table_length,
1312 TRAPS) {
1313 ClassFileStream* cfs = stream();
1315 u2* exception_table_start = cfs->get_u2_buffer();
1316 assert(exception_table_start != NULL, "null exception table");
1317 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1318 // Will check legal target after parsing code array in verifier.
1319 if (_need_verify) {
1320 for (unsigned int i = 0; i < exception_table_length; i++) {
1321 u2 start_pc = cfs->get_u2_fast();
1322 u2 end_pc = cfs->get_u2_fast();
1323 u2 handler_pc = cfs->get_u2_fast();
1324 u2 catch_type_index = cfs->get_u2_fast();
1325 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1326 "Illegal exception table range in class file %s",
1327 CHECK_NULL);
1328 guarantee_property(handler_pc < code_length,
1329 "Illegal exception table handler in class file %s",
1330 CHECK_NULL);
1331 if (catch_type_index != 0) {
1332 guarantee_property(valid_klass_reference_at(catch_type_index),
1333 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1334 }
1335 }
1336 } else {
1337 cfs->skip_u2_fast(exception_table_length * 4);
1338 }
1339 return exception_table_start;
1340 }
1342 void ClassFileParser::parse_linenumber_table(
1343 u4 code_attribute_length, u4 code_length,
1344 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1345 ClassFileStream* cfs = stream();
1346 unsigned int num_entries = cfs->get_u2(CHECK);
1348 // Each entry is a u2 start_pc, and a u2 line_number
1349 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1351 // Verify line number attribute and table length
1352 check_property(
1353 code_attribute_length == sizeof(u2) + length_in_bytes,
1354 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1356 cfs->guarantee_more(length_in_bytes, CHECK);
1358 if ((*write_stream) == NULL) {
1359 if (length_in_bytes > fixed_buffer_size) {
1360 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1361 } else {
1362 (*write_stream) = new CompressedLineNumberWriteStream(
1363 linenumbertable_buffer, fixed_buffer_size);
1364 }
1365 }
1367 while (num_entries-- > 0) {
1368 u2 bci = cfs->get_u2_fast(); // start_pc
1369 u2 line = cfs->get_u2_fast(); // line_number
1370 guarantee_property(bci < code_length,
1371 "Invalid pc in LineNumberTable in class file %s", CHECK);
1372 (*write_stream)->write_pair(bci, line);
1373 }
1374 }
1377 // Class file LocalVariableTable elements.
1378 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1379 public:
1380 u2 start_bci;
1381 u2 length;
1382 u2 name_cp_index;
1383 u2 descriptor_cp_index;
1384 u2 slot;
1385 };
1388 class LVT_Hash: public CHeapObj<mtClass> {
1389 public:
1390 LocalVariableTableElement *_elem; // element
1391 LVT_Hash* _next; // Next entry in hash table
1392 };
1394 unsigned int hash(LocalVariableTableElement *elem) {
1395 unsigned int raw_hash = elem->start_bci;
1397 raw_hash = elem->length + raw_hash * 37;
1398 raw_hash = elem->name_cp_index + raw_hash * 37;
1399 raw_hash = elem->slot + raw_hash * 37;
1401 return raw_hash % HASH_ROW_SIZE;
1402 }
1404 void initialize_hashtable(LVT_Hash** table) {
1405 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1406 table[i] = NULL;
1407 }
1408 }
1410 void clear_hashtable(LVT_Hash** table) {
1411 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1412 LVT_Hash* current = table[i];
1413 LVT_Hash* next;
1414 while (current != NULL) {
1415 next = current->_next;
1416 current->_next = NULL;
1417 delete(current);
1418 current = next;
1419 }
1420 table[i] = NULL;
1421 }
1422 }
1424 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1425 LVT_Hash* entry = table[index];
1427 /*
1428 * 3-tuple start_bci/length/slot has to be unique key,
1429 * so the following comparison seems to be redundant:
1430 * && elem->name_cp_index == entry->_elem->name_cp_index
1431 */
1432 while (entry != NULL) {
1433 if (elem->start_bci == entry->_elem->start_bci
1434 && elem->length == entry->_elem->length
1435 && elem->name_cp_index == entry->_elem->name_cp_index
1436 && elem->slot == entry->_elem->slot
1437 ) {
1438 return entry;
1439 }
1440 entry = entry->_next;
1441 }
1442 return NULL;
1443 }
1445 // Return false if the local variable is found in table.
1446 // Return true if no duplicate is found.
1447 // And local variable is added as a new entry in table.
1448 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1449 // First lookup for duplicates
1450 int index = hash(elem);
1451 LVT_Hash* entry = LVT_lookup(elem, index, table);
1453 if (entry != NULL) {
1454 return false;
1455 }
1456 // No duplicate is found, allocate a new entry and fill it.
1457 if ((entry = new LVT_Hash()) == NULL) {
1458 return false;
1459 }
1460 entry->_elem = elem;
1462 // Insert into hash table
1463 entry->_next = table[index];
1464 table[index] = entry;
1466 return true;
1467 }
1469 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1470 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1471 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1472 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1473 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1474 lvt->signature_cp_index = 0;
1475 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1476 }
1478 // Function is used to parse both attributes:
1479 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1480 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1481 u2 max_locals,
1482 u4 code_attribute_length,
1483 u2* localvariable_table_length,
1484 bool isLVTT,
1485 TRAPS) {
1486 ClassFileStream* cfs = stream();
1487 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1488 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1489 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1490 // Verify local variable table attribute has right length
1491 if (_need_verify) {
1492 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1493 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1494 }
1495 u2* localvariable_table_start = cfs->get_u2_buffer();
1496 assert(localvariable_table_start != NULL, "null local variable table");
1497 if (!_need_verify) {
1498 cfs->skip_u2_fast(size);
1499 } else {
1500 cfs->guarantee_more(size * 2, CHECK_NULL);
1501 for(int i = 0; i < (*localvariable_table_length); i++) {
1502 u2 start_pc = cfs->get_u2_fast();
1503 u2 length = cfs->get_u2_fast();
1504 u2 name_index = cfs->get_u2_fast();
1505 u2 descriptor_index = cfs->get_u2_fast();
1506 u2 index = cfs->get_u2_fast();
1507 // Assign to a u4 to avoid overflow
1508 u4 end_pc = (u4)start_pc + (u4)length;
1510 if (start_pc >= code_length) {
1511 classfile_parse_error(
1512 "Invalid start_pc %u in %s in class file %s",
1513 start_pc, tbl_name, CHECK_NULL);
1514 }
1515 if (end_pc > code_length) {
1516 classfile_parse_error(
1517 "Invalid length %u in %s in class file %s",
1518 length, tbl_name, CHECK_NULL);
1519 }
1520 int cp_size = _cp->length();
1521 guarantee_property(valid_symbol_at(name_index),
1522 "Name index %u in %s has bad constant type in class file %s",
1523 name_index, tbl_name, CHECK_NULL);
1524 guarantee_property(valid_symbol_at(descriptor_index),
1525 "Signature index %u in %s has bad constant type in class file %s",
1526 descriptor_index, tbl_name, CHECK_NULL);
1528 Symbol* name = _cp->symbol_at(name_index);
1529 Symbol* sig = _cp->symbol_at(descriptor_index);
1530 verify_legal_field_name(name, CHECK_NULL);
1531 u2 extra_slot = 0;
1532 if (!isLVTT) {
1533 verify_legal_field_signature(name, sig, CHECK_NULL);
1535 // 4894874: check special cases for double and long local variables
1536 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1537 sig == vmSymbols::type_signature(T_LONG)) {
1538 extra_slot = 1;
1539 }
1540 }
1541 guarantee_property((index + extra_slot) < max_locals,
1542 "Invalid index %u in %s in class file %s",
1543 index, tbl_name, CHECK_NULL);
1544 }
1545 }
1546 return localvariable_table_start;
1547 }
1550 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1551 u1* u1_array, u2* u2_array, TRAPS) {
1552 ClassFileStream* cfs = stream();
1553 u2 index = 0; // index in the array with long/double occupying two slots
1554 u4 i1 = *u1_index;
1555 u4 i2 = *u2_index + 1;
1556 for(int i = 0; i < array_length; i++) {
1557 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1558 index++;
1559 if (tag == ITEM_Long || tag == ITEM_Double) {
1560 index++;
1561 } else if (tag == ITEM_Object) {
1562 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1563 guarantee_property(valid_klass_reference_at(class_index),
1564 "Bad class index %u in StackMap in class file %s",
1565 class_index, CHECK);
1566 } else if (tag == ITEM_Uninitialized) {
1567 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1568 guarantee_property(
1569 offset < code_length,
1570 "Bad uninitialized type offset %u in StackMap in class file %s",
1571 offset, CHECK);
1572 } else {
1573 guarantee_property(
1574 tag <= (u1)ITEM_Uninitialized,
1575 "Unknown variable type %u in StackMap in class file %s",
1576 tag, CHECK);
1577 }
1578 }
1579 u2_array[*u2_index] = index;
1580 *u1_index = i1;
1581 *u2_index = i2;
1582 }
1584 u1* ClassFileParser::parse_stackmap_table(
1585 u4 code_attribute_length, TRAPS) {
1586 if (code_attribute_length == 0)
1587 return NULL;
1589 ClassFileStream* cfs = stream();
1590 u1* stackmap_table_start = cfs->get_u1_buffer();
1591 assert(stackmap_table_start != NULL, "null stackmap table");
1593 // check code_attribute_length first
1594 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1596 if (!_need_verify && !DumpSharedSpaces) {
1597 return NULL;
1598 }
1599 return stackmap_table_start;
1600 }
1602 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1603 u4 method_attribute_length,
1604 TRAPS) {
1605 ClassFileStream* cfs = stream();
1606 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1607 *checked_exceptions_length = cfs->get_u2_fast();
1608 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1609 u2* checked_exceptions_start = cfs->get_u2_buffer();
1610 assert(checked_exceptions_start != NULL, "null checked exceptions");
1611 if (!_need_verify) {
1612 cfs->skip_u2_fast(size);
1613 } else {
1614 // Verify each value in the checked exception table
1615 u2 checked_exception;
1616 u2 len = *checked_exceptions_length;
1617 cfs->guarantee_more(2 * len, CHECK_NULL);
1618 for (int i = 0; i < len; i++) {
1619 checked_exception = cfs->get_u2_fast();
1620 check_property(
1621 valid_klass_reference_at(checked_exception),
1622 "Exception name has bad type at constant pool %u in class file %s",
1623 checked_exception, CHECK_NULL);
1624 }
1625 }
1626 // check exceptions attribute length
1627 if (_need_verify) {
1628 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1629 sizeof(u2) * size),
1630 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1631 }
1632 return checked_exceptions_start;
1633 }
1635 void ClassFileParser::throwIllegalSignature(
1636 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1637 ResourceMark rm(THREAD);
1638 Exceptions::fthrow(THREAD_AND_LOCATION,
1639 vmSymbols::java_lang_ClassFormatError(),
1640 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1641 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1642 }
1644 // Skip an annotation. Return >=limit if there is any problem.
1645 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1646 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1647 // value := switch (tag:u1) { ... }
1648 index += 2; // skip atype
1649 if ((index += 2) >= limit) return limit; // read nmem
1650 int nmem = Bytes::get_Java_u2(buffer+index-2);
1651 while (--nmem >= 0 && index < limit) {
1652 index += 2; // skip member
1653 index = skip_annotation_value(buffer, limit, index);
1654 }
1655 return index;
1656 }
1658 // Skip an annotation value. Return >=limit if there is any problem.
1659 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1660 // value := switch (tag:u1) {
1661 // case B, C, I, S, Z, D, F, J, c: con:u2;
1662 // case e: e_class:u2 e_name:u2;
1663 // case s: s_con:u2;
1664 // case [: do(nval:u2) {value};
1665 // case @: annotation;
1666 // case s: s_con:u2;
1667 // }
1668 if ((index += 1) >= limit) return limit; // read tag
1669 u1 tag = buffer[index-1];
1670 switch (tag) {
1671 case 'B': case 'C': case 'I': case 'S': case 'Z':
1672 case 'D': case 'F': case 'J': case 'c': case 's':
1673 index += 2; // skip con or s_con
1674 break;
1675 case 'e':
1676 index += 4; // skip e_class, e_name
1677 break;
1678 case '[':
1679 {
1680 if ((index += 2) >= limit) return limit; // read nval
1681 int nval = Bytes::get_Java_u2(buffer+index-2);
1682 while (--nval >= 0 && index < limit) {
1683 index = skip_annotation_value(buffer, limit, index);
1684 }
1685 }
1686 break;
1687 case '@':
1688 index = skip_annotation(buffer, limit, index);
1689 break;
1690 default:
1691 assert(false, "annotation tag");
1692 return limit; // bad tag byte
1693 }
1694 return index;
1695 }
1697 // Sift through annotations, looking for those significant to the VM:
1698 void ClassFileParser::parse_annotations(u1* buffer, int limit,
1699 ClassFileParser::AnnotationCollector* coll,
1700 TRAPS) {
1701 // annotations := do(nann:u2) {annotation}
1702 int index = 0;
1703 if ((index += 2) >= limit) return; // read nann
1704 int nann = Bytes::get_Java_u2(buffer+index-2);
1705 enum { // initial annotation layout
1706 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1707 count_off = 2, // u2 such as 1 (one value)
1708 member_off = 4, // utf8 such as 'value'
1709 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1710 e_tag_val = 'e',
1711 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1712 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1713 e_size = 11, // end of 'e' annotation
1714 c_tag_val = 'c', // payload is type
1715 c_con_off = 7, // utf8 payload, such as 'I'
1716 c_size = 9, // end of 'c' annotation
1717 s_tag_val = 's', // payload is String
1718 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1719 s_size = 9,
1720 min_size = 6 // smallest possible size (zero members)
1721 };
1722 while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
1723 int index0 = index;
1724 index = skip_annotation(buffer, limit, index);
1725 u1* abase = buffer + index0;
1726 int atype = Bytes::get_Java_u2(abase + atype_off);
1727 int count = Bytes::get_Java_u2(abase + count_off);
1728 Symbol* aname = check_symbol_at(_cp, atype);
1729 if (aname == NULL) break; // invalid annotation name
1730 Symbol* member = NULL;
1731 if (count >= 1) {
1732 int member_index = Bytes::get_Java_u2(abase + member_off);
1733 member = check_symbol_at(_cp, member_index);
1734 if (member == NULL) break; // invalid member name
1735 }
1737 // Here is where parsing particular annotations will take place.
1738 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname);
1739 if (id == AnnotationCollector::_unknown) continue;
1740 coll->set_annotation(id);
1742 if (id == AnnotationCollector::_sun_misc_Contended) {
1743 // @Contended can optionally specify the contention group.
1744 //
1745 // Contended group defines the equivalence class over the fields:
1746 // the fields within the same contended group are not treated distinct.
1747 // The only exception is default group, which does not incur the
1748 // equivalence. Naturally, contention group for classes is meaningless.
1749 //
1750 // While the contention group is specified as String, annotation
1751 // values are already interned, and we might as well use the constant
1752 // pool index as the group tag.
1753 //
1754 u2 group_index = 0; // default contended group
1755 if (count == 1
1756 && s_size == (index - index0) // match size
1757 && s_tag_val == *(abase + tag_off)
1758 && member == vmSymbols::value_name()) {
1759 group_index = Bytes::get_Java_u2(abase + s_con_off);
1760 if (_cp->symbol_at(group_index)->utf8_length() == 0) {
1761 group_index = 0; // default contended group
1762 }
1763 }
1764 coll->set_contended_group(group_index);
1765 }
1766 }
1767 }
1769 ClassFileParser::AnnotationCollector::ID
1770 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1771 Symbol* name) {
1772 vmSymbols::SID sid = vmSymbols::find_sid(name);
1773 // Privileged code can use all annotations. Other code silently drops some.
1774 const bool privileged = loader_data->is_the_null_class_loader_data() ||
1775 loader_data->is_ext_class_loader_data() ||
1776 loader_data->is_anonymous();
1777 switch (sid) {
1778 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature):
1779 if (_location != _in_method) break; // only allow for methods
1780 if (!privileged) break; // only allow in privileged code
1781 return _method_CallerSensitive;
1782 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1783 if (_location != _in_method) break; // only allow for methods
1784 if (!privileged) break; // only allow in privileged code
1785 return _method_ForceInline;
1786 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1787 if (_location != _in_method) break; // only allow for methods
1788 if (!privileged) break; // only allow in privileged code
1789 return _method_DontInline;
1790 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature):
1791 if (_location != _in_method) break; // only allow for methods
1792 if (!privileged) break; // only allow in privileged code
1793 return _method_InjectedProfile;
1794 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1795 if (_location != _in_method) break; // only allow for methods
1796 if (!privileged) break; // only allow in privileged code
1797 return _method_LambdaForm_Compiled;
1798 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1799 if (_location != _in_method) break; // only allow for methods
1800 if (!privileged) break; // only allow in privileged code
1801 return _method_LambdaForm_Hidden;
1802 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature):
1803 if (_location != _in_field) break; // only allow for fields
1804 if (!privileged) break; // only allow in privileged code
1805 return _field_Stable;
1806 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1807 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1808 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1809 return _sun_misc_Contended;
1810 default: break;
1811 }
1812 return AnnotationCollector::_unknown;
1813 }
1815 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1816 if (is_contended())
1817 f->set_contended_group(contended_group());
1818 if (is_stable())
1819 f->set_stable(true);
1820 }
1822 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1823 // If there's an error deallocate metadata for field annotations
1824 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1825 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1826 }
1828 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1829 if (has_annotation(_method_CallerSensitive))
1830 m->set_caller_sensitive(true);
1831 if (has_annotation(_method_ForceInline))
1832 m->set_force_inline(true);
1833 if (has_annotation(_method_DontInline))
1834 m->set_dont_inline(true);
1835 if (has_annotation(_method_InjectedProfile))
1836 m->set_has_injected_profile(true);
1837 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1838 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1839 if (has_annotation(_method_LambdaForm_Hidden))
1840 m->set_hidden(true);
1841 }
1843 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1844 k->set_is_contended(is_contended());
1845 }
1848 #define MAX_ARGS_SIZE 255
1849 #define MAX_CODE_SIZE 65535
1850 #define INITIAL_MAX_LVT_NUMBER 256
1852 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1853 *
1854 * Rules for LVT's and LVTT's are:
1855 * - There can be any number of LVT's and LVTT's.
1856 * - If there are n LVT's, it is the same as if there was just
1857 * one LVT containing all the entries from the n LVT's.
1858 * - There may be no more than one LVT entry per local variable.
1859 * Two LVT entries are 'equal' if these fields are the same:
1860 * start_pc, length, name, slot
1861 * - There may be no more than one LVTT entry per each LVT entry.
1862 * Each LVTT entry has to match some LVT entry.
1863 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1864 */
1865 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1866 int lvt_cnt,
1867 u2* localvariable_table_length,
1868 u2** localvariable_table_start,
1869 int lvtt_cnt,
1870 u2* localvariable_type_table_length,
1871 u2** localvariable_type_table_start,
1872 TRAPS) {
1874 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1875 initialize_hashtable(lvt_Hash);
1877 // To fill LocalVariableTable in
1878 Classfile_LVT_Element* cf_lvt;
1879 LocalVariableTableElement* lvt = cm->localvariable_table_start();
1881 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1882 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1883 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1884 copy_lvt_element(&cf_lvt[idx], lvt);
1885 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1886 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1887 && _need_verify
1888 && _major_version >= JAVA_1_5_VERSION) {
1889 clear_hashtable(lvt_Hash);
1890 classfile_parse_error("Duplicated LocalVariableTable attribute "
1891 "entry for '%s' in class file %s",
1892 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1893 CHECK);
1894 }
1895 }
1896 }
1898 // To merge LocalVariableTable and LocalVariableTypeTable
1899 Classfile_LVT_Element* cf_lvtt;
1900 LocalVariableTableElement lvtt_elem;
1902 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1903 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1904 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1905 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1906 int index = hash(&lvtt_elem);
1907 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1908 if (entry == NULL) {
1909 if (_need_verify) {
1910 clear_hashtable(lvt_Hash);
1911 classfile_parse_error("LVTT entry for '%s' in class file %s "
1912 "does not match any LVT entry",
1913 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1914 CHECK);
1915 }
1916 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1917 clear_hashtable(lvt_Hash);
1918 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1919 "entry for '%s' in class file %s",
1920 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1921 CHECK);
1922 } else {
1923 // to add generic signatures into LocalVariableTable
1924 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1925 }
1926 }
1927 }
1928 clear_hashtable(lvt_Hash);
1929 }
1932 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1933 u1* runtime_visible_annotations,
1934 int runtime_visible_annotations_length,
1935 u1* runtime_invisible_annotations,
1936 int runtime_invisible_annotations_length,
1937 u1* runtime_visible_parameter_annotations,
1938 int runtime_visible_parameter_annotations_length,
1939 u1* runtime_invisible_parameter_annotations,
1940 int runtime_invisible_parameter_annotations_length,
1941 u1* runtime_visible_type_annotations,
1942 int runtime_visible_type_annotations_length,
1943 u1* runtime_invisible_type_annotations,
1944 int runtime_invisible_type_annotations_length,
1945 u1* annotation_default,
1946 int annotation_default_length,
1947 TRAPS) {
1949 AnnotationArray* a;
1951 if (runtime_visible_annotations_length +
1952 runtime_invisible_annotations_length > 0) {
1953 a = assemble_annotations(runtime_visible_annotations,
1954 runtime_visible_annotations_length,
1955 runtime_invisible_annotations,
1956 runtime_invisible_annotations_length,
1957 CHECK);
1958 cm->set_method_annotations(a);
1959 }
1961 if (runtime_visible_parameter_annotations_length +
1962 runtime_invisible_parameter_annotations_length > 0) {
1963 a = assemble_annotations(runtime_visible_parameter_annotations,
1964 runtime_visible_parameter_annotations_length,
1965 runtime_invisible_parameter_annotations,
1966 runtime_invisible_parameter_annotations_length,
1967 CHECK);
1968 cm->set_parameter_annotations(a);
1969 }
1971 if (annotation_default_length > 0) {
1972 a = assemble_annotations(annotation_default,
1973 annotation_default_length,
1974 NULL,
1975 0,
1976 CHECK);
1977 cm->set_default_annotations(a);
1978 }
1980 if (runtime_visible_type_annotations_length +
1981 runtime_invisible_type_annotations_length > 0) {
1982 a = assemble_annotations(runtime_visible_type_annotations,
1983 runtime_visible_type_annotations_length,
1984 runtime_invisible_type_annotations,
1985 runtime_invisible_type_annotations_length,
1986 CHECK);
1987 cm->set_type_annotations(a);
1988 }
1989 }
1992 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1993 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1994 // Method* to save footprint, so we only know the size of the resulting Method* when the
1995 // entire method attribute is parsed.
1996 //
1997 // The promoted_flags parameter is used to pass relevant access_flags
1998 // from the method back up to the containing klass. These flag values
1999 // are added to klass's access_flags.
2001 methodHandle ClassFileParser::parse_method(bool is_interface,
2002 AccessFlags *promoted_flags,
2003 TRAPS) {
2004 ClassFileStream* cfs = stream();
2005 methodHandle nullHandle;
2006 ResourceMark rm(THREAD);
2007 // Parse fixed parts
2008 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
2010 int flags = cfs->get_u2_fast();
2011 u2 name_index = cfs->get_u2_fast();
2012 int cp_size = _cp->length();
2013 check_property(
2014 valid_symbol_at(name_index),
2015 "Illegal constant pool index %u for method name in class file %s",
2016 name_index, CHECK_(nullHandle));
2017 Symbol* name = _cp->symbol_at(name_index);
2018 verify_legal_method_name(name, CHECK_(nullHandle));
2020 u2 signature_index = cfs->get_u2_fast();
2021 guarantee_property(
2022 valid_symbol_at(signature_index),
2023 "Illegal constant pool index %u for method signature in class file %s",
2024 signature_index, CHECK_(nullHandle));
2025 Symbol* signature = _cp->symbol_at(signature_index);
2027 AccessFlags access_flags;
2028 if (name == vmSymbols::class_initializer_name()) {
2029 // We ignore the other access flags for a valid class initializer.
2030 // (JVM Spec 2nd ed., chapter 4.6)
2031 if (_major_version < 51) { // backward compatibility
2032 flags = JVM_ACC_STATIC;
2033 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2034 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2035 }
2036 } else {
2037 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
2038 }
2040 int args_size = -1; // only used when _need_verify is true
2041 if (_need_verify) {
2042 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2043 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
2044 if (args_size > MAX_ARGS_SIZE) {
2045 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
2046 }
2047 }
2049 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2051 // Default values for code and exceptions attribute elements
2052 u2 max_stack = 0;
2053 u2 max_locals = 0;
2054 u4 code_length = 0;
2055 u1* code_start = 0;
2056 u2 exception_table_length = 0;
2057 u2* exception_table_start = NULL;
2058 Array<int>* exception_handlers = Universe::the_empty_int_array();
2059 u2 checked_exceptions_length = 0;
2060 u2* checked_exceptions_start = NULL;
2061 CompressedLineNumberWriteStream* linenumber_table = NULL;
2062 int linenumber_table_length = 0;
2063 int total_lvt_length = 0;
2064 u2 lvt_cnt = 0;
2065 u2 lvtt_cnt = 0;
2066 bool lvt_allocated = false;
2067 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2068 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2069 u2* localvariable_table_length;
2070 u2** localvariable_table_start;
2071 u2* localvariable_type_table_length;
2072 u2** localvariable_type_table_start;
2073 u2 method_parameters_length = 0;
2074 u1* method_parameters_data = NULL;
2075 bool method_parameters_seen = false;
2076 bool parsed_code_attribute = false;
2077 bool parsed_checked_exceptions_attribute = false;
2078 bool parsed_stackmap_attribute = false;
2079 // stackmap attribute - JDK1.5
2080 u1* stackmap_data = NULL;
2081 int stackmap_data_length = 0;
2082 u2 generic_signature_index = 0;
2083 MethodAnnotationCollector parsed_annotations;
2084 u1* runtime_visible_annotations = NULL;
2085 int runtime_visible_annotations_length = 0;
2086 u1* runtime_invisible_annotations = NULL;
2087 int runtime_invisible_annotations_length = 0;
2088 u1* runtime_visible_parameter_annotations = NULL;
2089 int runtime_visible_parameter_annotations_length = 0;
2090 u1* runtime_invisible_parameter_annotations = NULL;
2091 int runtime_invisible_parameter_annotations_length = 0;
2092 u1* runtime_visible_type_annotations = NULL;
2093 int runtime_visible_type_annotations_length = 0;
2094 u1* runtime_invisible_type_annotations = NULL;
2095 int runtime_invisible_type_annotations_length = 0;
2096 bool runtime_invisible_type_annotations_exists = false;
2097 u1* annotation_default = NULL;
2098 int annotation_default_length = 0;
2100 // Parse code and exceptions attribute
2101 u2 method_attributes_count = cfs->get_u2_fast();
2102 while (method_attributes_count--) {
2103 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
2104 u2 method_attribute_name_index = cfs->get_u2_fast();
2105 u4 method_attribute_length = cfs->get_u4_fast();
2106 check_property(
2107 valid_symbol_at(method_attribute_name_index),
2108 "Invalid method attribute name index %u in class file %s",
2109 method_attribute_name_index, CHECK_(nullHandle));
2111 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2112 if (method_attribute_name == vmSymbols::tag_code()) {
2113 // Parse Code attribute
2114 if (_need_verify) {
2115 guarantee_property(
2116 !access_flags.is_native() && !access_flags.is_abstract(),
2117 "Code attribute in native or abstract methods in class file %s",
2118 CHECK_(nullHandle));
2119 }
2120 if (parsed_code_attribute) {
2121 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2122 }
2123 parsed_code_attribute = true;
2125 // Stack size, locals size, and code size
2126 if (_major_version == 45 && _minor_version <= 2) {
2127 cfs->guarantee_more(4, CHECK_(nullHandle));
2128 max_stack = cfs->get_u1_fast();
2129 max_locals = cfs->get_u1_fast();
2130 code_length = cfs->get_u2_fast();
2131 } else {
2132 cfs->guarantee_more(8, CHECK_(nullHandle));
2133 max_stack = cfs->get_u2_fast();
2134 max_locals = cfs->get_u2_fast();
2135 code_length = cfs->get_u4_fast();
2136 }
2137 if (_need_verify) {
2138 guarantee_property(args_size <= max_locals,
2139 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2140 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2141 "Invalid method Code length %u in class file %s",
2142 code_length, CHECK_(nullHandle));
2143 }
2144 // Code pointer
2145 code_start = cfs->get_u1_buffer();
2146 assert(code_start != NULL, "null code start");
2147 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2148 cfs->skip_u1_fast(code_length);
2150 // Exception handler table
2151 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2152 exception_table_length = cfs->get_u2_fast();
2153 if (exception_table_length > 0) {
2154 exception_table_start =
2155 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2156 }
2158 // Parse additional attributes in code attribute
2159 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2160 u2 code_attributes_count = cfs->get_u2_fast();
2162 unsigned int calculated_attribute_length = 0;
2164 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2165 calculated_attribute_length =
2166 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2167 } else {
2168 // max_stack, locals and length are smaller in pre-version 45.2 classes
2169 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2170 }
2171 calculated_attribute_length +=
2172 code_length +
2173 sizeof(exception_table_length) +
2174 sizeof(code_attributes_count) +
2175 exception_table_length *
2176 ( sizeof(u2) + // start_pc
2177 sizeof(u2) + // end_pc
2178 sizeof(u2) + // handler_pc
2179 sizeof(u2) ); // catch_type_index
2181 while (code_attributes_count--) {
2182 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2183 u2 code_attribute_name_index = cfs->get_u2_fast();
2184 u4 code_attribute_length = cfs->get_u4_fast();
2185 calculated_attribute_length += code_attribute_length +
2186 sizeof(code_attribute_name_index) +
2187 sizeof(code_attribute_length);
2188 check_property(valid_symbol_at(code_attribute_name_index),
2189 "Invalid code attribute name index %u in class file %s",
2190 code_attribute_name_index,
2191 CHECK_(nullHandle));
2192 if (LoadLineNumberTables &&
2193 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2194 // Parse and compress line number table
2195 parse_linenumber_table(code_attribute_length, code_length,
2196 &linenumber_table, CHECK_(nullHandle));
2198 } else if (LoadLocalVariableTables &&
2199 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2200 // Parse local variable table
2201 if (!lvt_allocated) {
2202 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2203 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2204 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2205 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2206 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2207 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2208 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2209 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2210 lvt_allocated = true;
2211 }
2212 if (lvt_cnt == max_lvt_cnt) {
2213 max_lvt_cnt <<= 1;
2214 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2215 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2216 }
2217 localvariable_table_start[lvt_cnt] =
2218 parse_localvariable_table(code_length,
2219 max_locals,
2220 code_attribute_length,
2221 &localvariable_table_length[lvt_cnt],
2222 false, // is not LVTT
2223 CHECK_(nullHandle));
2224 total_lvt_length += localvariable_table_length[lvt_cnt];
2225 lvt_cnt++;
2226 } else if (LoadLocalVariableTypeTables &&
2227 _major_version >= JAVA_1_5_VERSION &&
2228 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2229 if (!lvt_allocated) {
2230 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2231 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2232 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2233 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2234 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2235 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2236 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2237 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2238 lvt_allocated = true;
2239 }
2240 // Parse local variable type table
2241 if (lvtt_cnt == max_lvtt_cnt) {
2242 max_lvtt_cnt <<= 1;
2243 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2244 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2245 }
2246 localvariable_type_table_start[lvtt_cnt] =
2247 parse_localvariable_table(code_length,
2248 max_locals,
2249 code_attribute_length,
2250 &localvariable_type_table_length[lvtt_cnt],
2251 true, // is LVTT
2252 CHECK_(nullHandle));
2253 lvtt_cnt++;
2254 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2255 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2256 // Stack map is only needed by the new verifier in JDK1.5.
2257 if (parsed_stackmap_attribute) {
2258 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2259 }
2260 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2261 stackmap_data_length = code_attribute_length;
2262 parsed_stackmap_attribute = true;
2263 } else {
2264 // Skip unknown attributes
2265 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2266 }
2267 }
2268 // check method attribute length
2269 if (_need_verify) {
2270 guarantee_property(method_attribute_length == calculated_attribute_length,
2271 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2272 }
2273 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2274 // Parse Exceptions attribute
2275 if (parsed_checked_exceptions_attribute) {
2276 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2277 }
2278 parsed_checked_exceptions_attribute = true;
2279 checked_exceptions_start =
2280 parse_checked_exceptions(&checked_exceptions_length,
2281 method_attribute_length,
2282 CHECK_(nullHandle));
2283 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2284 // reject multiple method parameters
2285 if (method_parameters_seen) {
2286 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2287 }
2288 method_parameters_seen = true;
2289 method_parameters_length = cfs->get_u1_fast();
2290 if (method_attribute_length != (method_parameters_length * 4u) + 1u) {
2291 classfile_parse_error(
2292 "Invalid MethodParameters method attribute length %u in class file",
2293 method_attribute_length, CHECK_(nullHandle));
2294 }
2295 method_parameters_data = cfs->get_u1_buffer();
2296 cfs->skip_u2_fast(method_parameters_length);
2297 cfs->skip_u2_fast(method_parameters_length);
2298 // ignore this attribute if it cannot be reflected
2299 if (!SystemDictionary::Parameter_klass_loaded())
2300 method_parameters_length = 0;
2301 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2302 if (method_attribute_length != 0) {
2303 classfile_parse_error(
2304 "Invalid Synthetic method attribute length %u in class file %s",
2305 method_attribute_length, CHECK_(nullHandle));
2306 }
2307 // Should we check that there hasn't already been a synthetic attribute?
2308 access_flags.set_is_synthetic();
2309 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2310 if (method_attribute_length != 0) {
2311 classfile_parse_error(
2312 "Invalid Deprecated method attribute length %u in class file %s",
2313 method_attribute_length, CHECK_(nullHandle));
2314 }
2315 } else if (_major_version >= JAVA_1_5_VERSION) {
2316 if (method_attribute_name == vmSymbols::tag_signature()) {
2317 if (method_attribute_length != 2) {
2318 classfile_parse_error(
2319 "Invalid Signature attribute length %u in class file %s",
2320 method_attribute_length, CHECK_(nullHandle));
2321 }
2322 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle));
2323 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2324 runtime_visible_annotations_length = method_attribute_length;
2325 runtime_visible_annotations = cfs->get_u1_buffer();
2326 assert(runtime_visible_annotations != NULL, "null visible annotations");
2327 parse_annotations(runtime_visible_annotations,
2328 runtime_visible_annotations_length, &parsed_annotations,
2329 CHECK_(nullHandle));
2330 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2331 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2332 runtime_invisible_annotations_length = method_attribute_length;
2333 runtime_invisible_annotations = cfs->get_u1_buffer();
2334 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2335 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
2336 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2337 runtime_visible_parameter_annotations_length = method_attribute_length;
2338 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2339 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2340 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2341 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2342 runtime_invisible_parameter_annotations_length = method_attribute_length;
2343 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2344 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2345 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
2346 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2347 annotation_default_length = method_attribute_length;
2348 annotation_default = cfs->get_u1_buffer();
2349 assert(annotation_default != NULL, "null annotation default");
2350 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2351 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2352 if (runtime_visible_type_annotations != NULL) {
2353 classfile_parse_error(
2354 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2355 CHECK_(nullHandle));
2356 }
2357 runtime_visible_type_annotations_length = method_attribute_length;
2358 runtime_visible_type_annotations = cfs->get_u1_buffer();
2359 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2360 // No need for the VM to parse Type annotations
2361 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2362 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2363 if (runtime_invisible_type_annotations_exists) {
2364 classfile_parse_error(
2365 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2366 CHECK_(nullHandle));
2367 } else {
2368 runtime_invisible_type_annotations_exists = true;
2369 }
2370 if (PreserveAllAnnotations) {
2371 runtime_invisible_type_annotations_length = method_attribute_length;
2372 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2373 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2374 }
2375 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2376 } else {
2377 // Skip unknown attributes
2378 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2379 }
2380 } else {
2381 // Skip unknown attributes
2382 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2383 }
2384 }
2386 if (linenumber_table != NULL) {
2387 linenumber_table->write_terminator();
2388 linenumber_table_length = linenumber_table->position();
2389 }
2391 // Make sure there's at least one Code attribute in non-native/non-abstract method
2392 if (_need_verify) {
2393 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2394 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2395 }
2397 // All sizing information for a Method* is finally available, now create it
2398 InlineTableSizes sizes(
2399 total_lvt_length,
2400 linenumber_table_length,
2401 exception_table_length,
2402 checked_exceptions_length,
2403 method_parameters_length,
2404 generic_signature_index,
2405 runtime_visible_annotations_length +
2406 runtime_invisible_annotations_length,
2407 runtime_visible_parameter_annotations_length +
2408 runtime_invisible_parameter_annotations_length,
2409 runtime_visible_type_annotations_length +
2410 runtime_invisible_type_annotations_length,
2411 annotation_default_length,
2412 0);
2414 Method* m = Method::allocate(
2415 _loader_data, code_length, access_flags, &sizes,
2416 ConstMethod::NORMAL, CHECK_(nullHandle));
2418 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2420 // Fill in information from fixed part (access_flags already set)
2421 m->set_constants(_cp);
2422 m->set_name_index(name_index);
2423 m->set_signature_index(signature_index);
2425 ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2426 m->constMethod()->set_result_type(rtf.type());
2428 if (args_size >= 0) {
2429 m->set_size_of_parameters(args_size);
2430 } else {
2431 m->compute_size_of_parameters(THREAD);
2432 }
2433 #ifdef ASSERT
2434 if (args_size >= 0) {
2435 m->compute_size_of_parameters(THREAD);
2436 assert(args_size == m->size_of_parameters(), "");
2437 }
2438 #endif
2440 // Fill in code attribute information
2441 m->set_max_stack(max_stack);
2442 m->set_max_locals(max_locals);
2443 if (stackmap_data != NULL) {
2444 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2445 stackmap_data_length, CHECK_NULL);
2446 }
2448 // Copy byte codes
2449 m->set_code(code_start);
2451 // Copy line number table
2452 if (linenumber_table != NULL) {
2453 memcpy(m->compressed_linenumber_table(),
2454 linenumber_table->buffer(), linenumber_table_length);
2455 }
2457 // Copy exception table
2458 if (exception_table_length > 0) {
2459 int size =
2460 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2461 copy_u2_with_conversion((u2*) m->exception_table_start(),
2462 exception_table_start, size);
2463 }
2465 // Copy method parameters
2466 if (method_parameters_length > 0) {
2467 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2468 for (int i = 0; i < method_parameters_length; i++) {
2469 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2470 method_parameters_data += 2;
2471 elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2472 method_parameters_data += 2;
2473 }
2474 }
2476 // Copy checked exceptions
2477 if (checked_exceptions_length > 0) {
2478 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2479 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2480 }
2482 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2483 if (total_lvt_length > 0) {
2484 promoted_flags->set_has_localvariable_table();
2485 copy_localvariable_table(m->constMethod(), lvt_cnt,
2486 localvariable_table_length,
2487 localvariable_table_start,
2488 lvtt_cnt,
2489 localvariable_type_table_length,
2490 localvariable_type_table_start, CHECK_NULL);
2491 }
2493 if (parsed_annotations.has_any_annotations())
2494 parsed_annotations.apply_to(m);
2496 // Copy annotations
2497 copy_method_annotations(m->constMethod(),
2498 runtime_visible_annotations,
2499 runtime_visible_annotations_length,
2500 runtime_invisible_annotations,
2501 runtime_invisible_annotations_length,
2502 runtime_visible_parameter_annotations,
2503 runtime_visible_parameter_annotations_length,
2504 runtime_invisible_parameter_annotations,
2505 runtime_invisible_parameter_annotations_length,
2506 runtime_visible_type_annotations,
2507 runtime_visible_type_annotations_length,
2508 runtime_invisible_type_annotations,
2509 runtime_invisible_type_annotations_length,
2510 annotation_default,
2511 annotation_default_length,
2512 CHECK_NULL);
2514 if (name == vmSymbols::finalize_method_name() &&
2515 signature == vmSymbols::void_method_signature()) {
2516 if (m->is_empty_method()) {
2517 _has_empty_finalizer = true;
2518 } else {
2519 _has_finalizer = true;
2520 }
2521 }
2522 if (name == vmSymbols::object_initializer_name() &&
2523 signature == vmSymbols::void_method_signature() &&
2524 m->is_vanilla_constructor()) {
2525 _has_vanilla_constructor = true;
2526 }
2528 NOT_PRODUCT(m->verify());
2529 return m;
2530 }
2533 // The promoted_flags parameter is used to pass relevant access_flags
2534 // from the methods back up to the containing klass. These flag values
2535 // are added to klass's access_flags.
2537 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2538 AccessFlags* promoted_flags,
2539 bool* has_final_method,
2540 bool* declares_default_methods,
2541 TRAPS) {
2542 ClassFileStream* cfs = stream();
2543 cfs->guarantee_more(2, CHECK_NULL); // length
2544 u2 length = cfs->get_u2_fast();
2545 if (length == 0) {
2546 _methods = Universe::the_empty_method_array();
2547 } else {
2548 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2550 HandleMark hm(THREAD);
2551 for (int index = 0; index < length; index++) {
2552 methodHandle method = parse_method(is_interface,
2553 promoted_flags,
2554 CHECK_NULL);
2556 if (method->is_final()) {
2557 *has_final_method = true;
2558 }
2559 // declares_default_methods: declares concrete instance methods, any access flags
2560 // used for interface initialization, and default method inheritance analysis
2561 if (is_interface && !(*declares_default_methods)
2562 && !method->is_abstract() && !method->is_static()) {
2563 *declares_default_methods = true;
2564 }
2565 _methods->at_put(index, method());
2566 }
2568 if (_need_verify && length > 1) {
2569 // Check duplicated methods
2570 ResourceMark rm(THREAD);
2571 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2572 THREAD, NameSigHash*, HASH_ROW_SIZE);
2573 initialize_hashtable(names_and_sigs);
2574 bool dup = false;
2575 {
2576 debug_only(No_Safepoint_Verifier nsv;)
2577 for (int i = 0; i < length; i++) {
2578 Method* m = _methods->at(i);
2579 // If no duplicates, add name/signature in hashtable names_and_sigs.
2580 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2581 dup = true;
2582 break;
2583 }
2584 }
2585 }
2586 if (dup) {
2587 classfile_parse_error("Duplicate method name&signature in class file %s",
2588 CHECK_NULL);
2589 }
2590 }
2591 }
2592 return _methods;
2593 }
2596 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2597 int length = methods->length();
2598 // If JVMTI original method ordering or sharing is enabled we have to
2599 // remember the original class file ordering.
2600 // We temporarily use the vtable_index field in the Method* to store the
2601 // class file index, so we can read in after calling qsort.
2602 // Put the method ordering in the shared archive.
2603 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2604 for (int index = 0; index < length; index++) {
2605 Method* m = methods->at(index);
2606 assert(!m->valid_vtable_index(), "vtable index should not be set");
2607 m->set_vtable_index(index);
2608 }
2609 }
2610 // Sort method array by ascending method name (for faster lookups & vtable construction)
2611 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2612 Method::sort_methods(methods);
2614 intArray* method_ordering = NULL;
2615 // If JVMTI original method ordering or sharing is enabled construct int
2616 // array remembering the original ordering
2617 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2618 method_ordering = new intArray(length);
2619 for (int index = 0; index < length; index++) {
2620 Method* m = methods->at(index);
2621 int old_index = m->vtable_index();
2622 assert(old_index >= 0 && old_index < length, "invalid method index");
2623 method_ordering->at_put(index, old_index);
2624 m->set_vtable_index(Method::invalid_vtable_index);
2625 }
2626 }
2627 return method_ordering;
2628 }
2630 // Parse generic_signature attribute for methods and fields
2631 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) {
2632 ClassFileStream* cfs = stream();
2633 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2634 u2 generic_signature_index = cfs->get_u2_fast();
2635 check_property(
2636 valid_symbol_at(generic_signature_index),
2637 "Invalid Signature attribute at constant pool index %u in class file %s",
2638 generic_signature_index, CHECK_0);
2639 return generic_signature_index;
2640 }
2642 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2643 ClassFileStream* cfs = stream();
2644 cfs->guarantee_more(2, CHECK); // sourcefile_index
2645 u2 sourcefile_index = cfs->get_u2_fast();
2646 check_property(
2647 valid_symbol_at(sourcefile_index),
2648 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2649 sourcefile_index, CHECK);
2650 set_class_sourcefile_index(sourcefile_index);
2651 }
2655 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2656 ClassFileStream* cfs = stream();
2657 u1* sde_buffer = cfs->get_u1_buffer();
2658 assert(sde_buffer != NULL, "null sde buffer");
2660 // Don't bother storing it if there is no way to retrieve it
2661 if (JvmtiExport::can_get_source_debug_extension()) {
2662 assert((length+1) > length, "Overflow checking");
2663 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2664 for (int i = 0; i < length; i++) {
2665 sde[i] = sde_buffer[i];
2666 }
2667 sde[length] = '\0';
2668 set_class_sde_buffer((char*)sde, length);
2669 }
2670 // Got utf8 string, set stream position forward
2671 cfs->skip_u1(length, CHECK);
2672 }
2675 // Inner classes can be static, private or protected (classic VM does this)
2676 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2678 // Return number of classes in the inner classes attribute table
2679 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2680 bool parsed_enclosingmethod_attribute,
2681 u2 enclosing_method_class_index,
2682 u2 enclosing_method_method_index,
2683 TRAPS) {
2684 ClassFileStream* cfs = stream();
2685 u1* current_mark = cfs->current();
2686 u2 length = 0;
2687 if (inner_classes_attribute_start != NULL) {
2688 cfs->set_current(inner_classes_attribute_start);
2689 cfs->guarantee_more(2, CHECK_0); // length
2690 length = cfs->get_u2_fast();
2691 }
2693 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2694 // method data:
2695 // [inner_class_info_index,
2696 // outer_class_info_index,
2697 // inner_name_index,
2698 // inner_class_access_flags,
2699 // ...
2700 // enclosing_method_class_index,
2701 // enclosing_method_method_index]
2702 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2703 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2704 _inner_classes = inner_classes;
2706 int index = 0;
2707 int cp_size = _cp->length();
2708 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2709 for (int n = 0; n < length; n++) {
2710 // Inner class index
2711 u2 inner_class_info_index = cfs->get_u2_fast();
2712 check_property(
2713 inner_class_info_index == 0 ||
2714 valid_klass_reference_at(inner_class_info_index),
2715 "inner_class_info_index %u has bad constant type in class file %s",
2716 inner_class_info_index, CHECK_0);
2717 // Outer class index
2718 u2 outer_class_info_index = cfs->get_u2_fast();
2719 check_property(
2720 outer_class_info_index == 0 ||
2721 valid_klass_reference_at(outer_class_info_index),
2722 "outer_class_info_index %u has bad constant type in class file %s",
2723 outer_class_info_index, CHECK_0);
2724 // Inner class name
2725 u2 inner_name_index = cfs->get_u2_fast();
2726 check_property(
2727 inner_name_index == 0 || valid_symbol_at(inner_name_index),
2728 "inner_name_index %u has bad constant type in class file %s",
2729 inner_name_index, CHECK_0);
2730 if (_need_verify) {
2731 guarantee_property(inner_class_info_index != outer_class_info_index,
2732 "Class is both outer and inner class in class file %s", CHECK_0);
2733 }
2734 // Access flags
2735 AccessFlags inner_access_flags;
2736 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2737 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2738 // Set abstract bit for old class files for backward compatibility
2739 flags |= JVM_ACC_ABSTRACT;
2740 }
2741 verify_legal_class_modifiers(flags, CHECK_0);
2742 inner_access_flags.set_flags(flags);
2744 inner_classes->at_put(index++, inner_class_info_index);
2745 inner_classes->at_put(index++, outer_class_info_index);
2746 inner_classes->at_put(index++, inner_name_index);
2747 inner_classes->at_put(index++, inner_access_flags.as_short());
2748 }
2750 // 4347400: make sure there's no duplicate entry in the classes array
2751 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2752 for(int i = 0; i < length * 4; i += 4) {
2753 for(int j = i + 4; j < length * 4; j += 4) {
2754 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2755 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2756 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2757 inner_classes->at(i+3) != inner_classes->at(j+3)),
2758 "Duplicate entry in InnerClasses in class file %s",
2759 CHECK_0);
2760 }
2761 }
2762 }
2764 // Set EnclosingMethod class and method indexes.
2765 if (parsed_enclosingmethod_attribute) {
2766 inner_classes->at_put(index++, enclosing_method_class_index);
2767 inner_classes->at_put(index++, enclosing_method_method_index);
2768 }
2769 assert(index == size, "wrong size");
2771 // Restore buffer's current position.
2772 cfs->set_current(current_mark);
2774 return length;
2775 }
2777 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2778 set_class_synthetic_flag(true);
2779 }
2781 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2782 ClassFileStream* cfs = stream();
2783 u2 signature_index = cfs->get_u2(CHECK);
2784 check_property(
2785 valid_symbol_at(signature_index),
2786 "Invalid constant pool index %u in Signature attribute in class file %s",
2787 signature_index, CHECK);
2788 set_class_generic_signature_index(signature_index);
2789 }
2791 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2792 ClassFileStream* cfs = stream();
2793 u1* current_start = cfs->current();
2795 guarantee_property(attribute_byte_length >= sizeof(u2),
2796 "Invalid BootstrapMethods attribute length %u in class file %s",
2797 attribute_byte_length,
2798 CHECK);
2800 cfs->guarantee_more(attribute_byte_length, CHECK);
2802 int attribute_array_length = cfs->get_u2_fast();
2804 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2805 "Short length on BootstrapMethods in class file %s",
2806 CHECK);
2808 // The attribute contains a counted array of counted tuples of shorts,
2809 // represending bootstrap specifiers:
2810 // length*{bootstrap_method_index, argument_count*{argument_index}}
2811 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2812 // operand_count = number of shorts in attr, except for leading length
2814 // The attribute is copied into a short[] array.
2815 // The array begins with a series of short[2] pairs, one for each tuple.
2816 int index_size = (attribute_array_length * 2);
2818 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2820 // Eagerly assign operands so they will be deallocated with the constant
2821 // pool if there is an error.
2822 _cp->set_operands(operands);
2824 int operand_fill_index = index_size;
2825 int cp_size = _cp->length();
2827 for (int n = 0; n < attribute_array_length; n++) {
2828 // Store a 32-bit offset into the header of the operand array.
2829 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2831 // Read a bootstrap specifier.
2832 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2833 u2 bootstrap_method_index = cfs->get_u2_fast();
2834 u2 argument_count = cfs->get_u2_fast();
2835 check_property(
2836 valid_cp_range(bootstrap_method_index, cp_size) &&
2837 _cp->tag_at(bootstrap_method_index).is_method_handle(),
2838 "bootstrap_method_index %u has bad constant type in class file %s",
2839 bootstrap_method_index,
2840 CHECK);
2842 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
2843 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
2844 CHECK);
2846 operands->at_put(operand_fill_index++, bootstrap_method_index);
2847 operands->at_put(operand_fill_index++, argument_count);
2849 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2850 for (int j = 0; j < argument_count; j++) {
2851 u2 argument_index = cfs->get_u2_fast();
2852 check_property(
2853 valid_cp_range(argument_index, cp_size) &&
2854 _cp->tag_at(argument_index).is_loadable_constant(),
2855 "argument_index %u has bad constant type in class file %s",
2856 argument_index,
2857 CHECK);
2858 operands->at_put(operand_fill_index++, argument_index);
2859 }
2860 }
2862 assert(operand_fill_index == operands->length(), "exact fill");
2864 u1* current_end = cfs->current();
2865 guarantee_property(current_end == current_start + attribute_byte_length,
2866 "Bad length on BootstrapMethods in class file %s",
2867 CHECK);
2868 }
2870 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2871 TRAPS) {
2872 ClassFileStream* cfs = stream();
2873 // Set inner classes attribute to default sentinel
2874 _inner_classes = Universe::the_empty_short_array();
2875 cfs->guarantee_more(2, CHECK); // attributes_count
2876 u2 attributes_count = cfs->get_u2_fast();
2877 bool parsed_sourcefile_attribute = false;
2878 bool parsed_innerclasses_attribute = false;
2879 bool parsed_enclosingmethod_attribute = false;
2880 bool parsed_bootstrap_methods_attribute = false;
2881 u1* runtime_visible_annotations = NULL;
2882 int runtime_visible_annotations_length = 0;
2883 u1* runtime_invisible_annotations = NULL;
2884 int runtime_invisible_annotations_length = 0;
2885 u1* runtime_visible_type_annotations = NULL;
2886 int runtime_visible_type_annotations_length = 0;
2887 u1* runtime_invisible_type_annotations = NULL;
2888 int runtime_invisible_type_annotations_length = 0;
2889 bool runtime_invisible_type_annotations_exists = false;
2890 u1* inner_classes_attribute_start = NULL;
2891 u4 inner_classes_attribute_length = 0;
2892 u2 enclosing_method_class_index = 0;
2893 u2 enclosing_method_method_index = 0;
2894 // Iterate over attributes
2895 while (attributes_count--) {
2896 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2897 u2 attribute_name_index = cfs->get_u2_fast();
2898 u4 attribute_length = cfs->get_u4_fast();
2899 check_property(
2900 valid_symbol_at(attribute_name_index),
2901 "Attribute name has bad constant pool index %u in class file %s",
2902 attribute_name_index, CHECK);
2903 Symbol* tag = _cp->symbol_at(attribute_name_index);
2904 if (tag == vmSymbols::tag_source_file()) {
2905 // Check for SourceFile tag
2906 if (_need_verify) {
2907 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2908 }
2909 if (parsed_sourcefile_attribute) {
2910 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2911 } else {
2912 parsed_sourcefile_attribute = true;
2913 }
2914 parse_classfile_sourcefile_attribute(CHECK);
2915 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2916 // Check for SourceDebugExtension tag
2917 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2918 } else if (tag == vmSymbols::tag_inner_classes()) {
2919 // Check for InnerClasses tag
2920 if (parsed_innerclasses_attribute) {
2921 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2922 } else {
2923 parsed_innerclasses_attribute = true;
2924 }
2925 inner_classes_attribute_start = cfs->get_u1_buffer();
2926 inner_classes_attribute_length = attribute_length;
2927 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2928 } else if (tag == vmSymbols::tag_synthetic()) {
2929 // Check for Synthetic tag
2930 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2931 if (attribute_length != 0) {
2932 classfile_parse_error(
2933 "Invalid Synthetic classfile attribute length %u in class file %s",
2934 attribute_length, CHECK);
2935 }
2936 parse_classfile_synthetic_attribute(CHECK);
2937 } else if (tag == vmSymbols::tag_deprecated()) {
2938 // Check for Deprecatd tag - 4276120
2939 if (attribute_length != 0) {
2940 classfile_parse_error(
2941 "Invalid Deprecated classfile attribute length %u in class file %s",
2942 attribute_length, CHECK);
2943 }
2944 } else if (_major_version >= JAVA_1_5_VERSION) {
2945 if (tag == vmSymbols::tag_signature()) {
2946 if (attribute_length != 2) {
2947 classfile_parse_error(
2948 "Wrong Signature attribute length %u in class file %s",
2949 attribute_length, CHECK);
2950 }
2951 parse_classfile_signature_attribute(CHECK);
2952 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2953 runtime_visible_annotations_length = attribute_length;
2954 runtime_visible_annotations = cfs->get_u1_buffer();
2955 assert(runtime_visible_annotations != NULL, "null visible annotations");
2956 parse_annotations(runtime_visible_annotations,
2957 runtime_visible_annotations_length,
2958 parsed_annotations,
2959 CHECK);
2960 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2961 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2962 runtime_invisible_annotations_length = attribute_length;
2963 runtime_invisible_annotations = cfs->get_u1_buffer();
2964 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2965 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2966 } else if (tag == vmSymbols::tag_enclosing_method()) {
2967 if (parsed_enclosingmethod_attribute) {
2968 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2969 } else {
2970 parsed_enclosingmethod_attribute = true;
2971 }
2972 cfs->guarantee_more(4, CHECK); // class_index, method_index
2973 enclosing_method_class_index = cfs->get_u2_fast();
2974 enclosing_method_method_index = cfs->get_u2_fast();
2975 if (enclosing_method_class_index == 0) {
2976 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2977 }
2978 // Validate the constant pool indices and types
2979 check_property(valid_klass_reference_at(enclosing_method_class_index),
2980 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2981 if (enclosing_method_method_index != 0 &&
2982 (!_cp->is_within_bounds(enclosing_method_method_index) ||
2983 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2984 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2985 }
2986 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2987 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2988 if (parsed_bootstrap_methods_attribute)
2989 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2990 parsed_bootstrap_methods_attribute = true;
2991 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
2992 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
2993 if (runtime_visible_type_annotations != NULL) {
2994 classfile_parse_error(
2995 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
2996 }
2997 runtime_visible_type_annotations_length = attribute_length;
2998 runtime_visible_type_annotations = cfs->get_u1_buffer();
2999 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3000 // No need for the VM to parse Type annotations
3001 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3002 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3003 if (runtime_invisible_type_annotations_exists) {
3004 classfile_parse_error(
3005 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3006 } else {
3007 runtime_invisible_type_annotations_exists = true;
3008 }
3009 if (PreserveAllAnnotations) {
3010 runtime_invisible_type_annotations_length = attribute_length;
3011 runtime_invisible_type_annotations = cfs->get_u1_buffer();
3012 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3013 }
3014 cfs->skip_u1(attribute_length, CHECK);
3015 } else {
3016 // Unknown attribute
3017 cfs->skip_u1(attribute_length, CHECK);
3018 }
3019 } else {
3020 // Unknown attribute
3021 cfs->skip_u1(attribute_length, CHECK);
3022 }
3023 }
3024 _annotations = assemble_annotations(runtime_visible_annotations,
3025 runtime_visible_annotations_length,
3026 runtime_invisible_annotations,
3027 runtime_invisible_annotations_length,
3028 CHECK);
3029 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3030 runtime_visible_type_annotations_length,
3031 runtime_invisible_type_annotations,
3032 runtime_invisible_type_annotations_length,
3033 CHECK);
3035 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3036 u2 num_of_classes = parse_classfile_inner_classes_attribute(
3037 inner_classes_attribute_start,
3038 parsed_innerclasses_attribute,
3039 enclosing_method_class_index,
3040 enclosing_method_method_index,
3041 CHECK);
3042 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3043 guarantee_property(
3044 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3045 "Wrong InnerClasses attribute length in class file %s", CHECK);
3046 }
3047 }
3049 if (_max_bootstrap_specifier_index >= 0) {
3050 guarantee_property(parsed_bootstrap_methods_attribute,
3051 "Missing BootstrapMethods attribute in class file %s", CHECK);
3052 }
3053 }
3055 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
3056 if (_synthetic_flag)
3057 k->set_is_synthetic();
3058 if (_sourcefile_index != 0) {
3059 k->set_source_file_name_index(_sourcefile_index);
3060 }
3061 if (_generic_signature_index != 0) {
3062 k->set_generic_signature_index(_generic_signature_index);
3063 }
3064 if (_sde_buffer != NULL) {
3065 k->set_source_debug_extension(_sde_buffer, _sde_length);
3066 }
3067 }
3069 // Create the Annotations object that will
3070 // hold the annotations array for the Klass.
3071 void ClassFileParser::create_combined_annotations(TRAPS) {
3072 if (_annotations == NULL &&
3073 _type_annotations == NULL &&
3074 _fields_annotations == NULL &&
3075 _fields_type_annotations == NULL) {
3076 // Don't create the Annotations object unnecessarily.
3077 return;
3078 }
3080 Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3081 annotations->set_class_annotations(_annotations);
3082 annotations->set_class_type_annotations(_type_annotations);
3083 annotations->set_fields_annotations(_fields_annotations);
3084 annotations->set_fields_type_annotations(_fields_type_annotations);
3086 // This is the Annotations object that will be
3087 // assigned to InstanceKlass being constructed.
3088 _combined_annotations = annotations;
3090 // The annotations arrays below has been transfered the
3091 // _combined_annotations so these fields can now be cleared.
3092 _annotations = NULL;
3093 _type_annotations = NULL;
3094 _fields_annotations = NULL;
3095 _fields_type_annotations = NULL;
3096 }
3098 // Transfer ownership of metadata allocated to the InstanceKlass.
3099 void ClassFileParser::apply_parsed_class_metadata(
3100 instanceKlassHandle this_klass,
3101 int java_fields_count, TRAPS) {
3102 _cp->set_pool_holder(this_klass());
3103 this_klass->set_constants(_cp);
3104 this_klass->set_fields(_fields, java_fields_count);
3105 this_klass->set_methods(_methods);
3106 this_klass->set_inner_classes(_inner_classes);
3107 this_klass->set_local_interfaces(_local_interfaces);
3108 this_klass->set_transitive_interfaces(_transitive_interfaces);
3109 this_klass->set_annotations(_combined_annotations);
3111 // Clear out these fields so they don't get deallocated by the destructor
3112 clear_class_metadata();
3113 }
3115 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3116 int runtime_visible_annotations_length,
3117 u1* runtime_invisible_annotations,
3118 int runtime_invisible_annotations_length, TRAPS) {
3119 AnnotationArray* annotations = NULL;
3120 if (runtime_visible_annotations != NULL ||
3121 runtime_invisible_annotations != NULL) {
3122 annotations = MetadataFactory::new_array<u1>(_loader_data,
3123 runtime_visible_annotations_length +
3124 runtime_invisible_annotations_length,
3125 CHECK_(annotations));
3126 if (runtime_visible_annotations != NULL) {
3127 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3128 annotations->at_put(i, runtime_visible_annotations[i]);
3129 }
3130 }
3131 if (runtime_invisible_annotations != NULL) {
3132 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3133 int append = runtime_visible_annotations_length+i;
3134 annotations->at_put(append, runtime_invisible_annotations[i]);
3135 }
3136 }
3137 }
3138 return annotations;
3139 }
3141 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3142 TRAPS) {
3143 instanceKlassHandle super_klass;
3144 if (super_class_index == 0) {
3145 check_property(_class_name == vmSymbols::java_lang_Object(),
3146 "Invalid superclass index %u in class file %s",
3147 super_class_index,
3148 CHECK_NULL);
3149 } else {
3150 check_property(valid_klass_reference_at(super_class_index),
3151 "Invalid superclass index %u in class file %s",
3152 super_class_index,
3153 CHECK_NULL);
3154 // The class name should be legal because it is checked when parsing constant pool.
3155 // However, make sure it is not an array type.
3156 bool is_array = false;
3157 if (_cp->tag_at(super_class_index).is_klass()) {
3158 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3159 if (_need_verify)
3160 is_array = super_klass->oop_is_array();
3161 } else if (_need_verify) {
3162 is_array = (_cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3163 }
3164 if (_need_verify) {
3165 guarantee_property(!is_array,
3166 "Bad superclass name in class file %s", CHECK_NULL);
3167 }
3168 }
3169 return super_klass;
3170 }
3173 // Values needed for oopmap and InstanceKlass creation
3174 class FieldLayoutInfo : public StackObj {
3175 public:
3176 int* nonstatic_oop_offsets;
3177 unsigned int* nonstatic_oop_counts;
3178 unsigned int nonstatic_oop_map_count;
3179 unsigned int total_oop_map_count;
3180 int instance_size;
3181 int nonstatic_field_size;
3182 int static_field_size;
3183 bool has_nonstatic_fields;
3184 };
3186 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3187 void ClassFileParser::layout_fields(Handle class_loader,
3188 FieldAllocationCount* fac,
3189 ClassAnnotationCollector* parsed_annotations,
3190 FieldLayoutInfo* info,
3191 TRAPS) {
3193 // Field size and offset computation
3194 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3195 int next_static_oop_offset = 0;
3196 int next_static_double_offset = 0;
3197 int next_static_word_offset = 0;
3198 int next_static_short_offset = 0;
3199 int next_static_byte_offset = 0;
3200 int next_nonstatic_oop_offset = 0;
3201 int next_nonstatic_double_offset = 0;
3202 int next_nonstatic_word_offset = 0;
3203 int next_nonstatic_short_offset = 0;
3204 int next_nonstatic_byte_offset = 0;
3205 int first_nonstatic_oop_offset = 0;
3206 int next_nonstatic_field_offset = 0;
3207 int next_nonstatic_padded_offset = 0;
3209 // Count the contended fields by type.
3210 //
3211 // We ignore static fields, because @Contended is not supported for them.
3212 // The layout code below will also ignore the static fields.
3213 int nonstatic_contended_count = 0;
3214 FieldAllocationCount fac_contended;
3215 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3216 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3217 if (fs.is_contended()) {
3218 fac_contended.count[atype]++;
3219 if (!fs.access_flags().is_static()) {
3220 nonstatic_contended_count++;
3221 }
3222 }
3223 }
3226 // Calculate the starting byte offsets
3227 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3228 next_static_double_offset = next_static_oop_offset +
3229 ((fac->count[STATIC_OOP]) * heapOopSize);
3230 if ( fac->count[STATIC_DOUBLE] &&
3231 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3232 Universe::field_type_should_be_aligned(T_LONG)) ) {
3233 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3234 }
3236 next_static_word_offset = next_static_double_offset +
3237 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3238 next_static_short_offset = next_static_word_offset +
3239 ((fac->count[STATIC_WORD]) * BytesPerInt);
3240 next_static_byte_offset = next_static_short_offset +
3241 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3243 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3244 nonstatic_field_size * heapOopSize;
3246 next_nonstatic_field_offset = nonstatic_fields_start;
3248 bool is_contended_class = parsed_annotations->is_contended();
3250 // Class is contended, pad before all the fields
3251 if (is_contended_class) {
3252 next_nonstatic_field_offset += ContendedPaddingWidth;
3253 }
3255 // Compute the non-contended fields count.
3256 // The packing code below relies on these counts to determine if some field
3257 // can be squeezed into the alignment gap. Contended fields are obviously
3258 // exempt from that.
3259 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3260 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3261 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3262 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3263 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3265 // Total non-static fields count, including every contended field
3266 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3267 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3268 fac->count[NONSTATIC_OOP];
3270 bool super_has_nonstatic_fields =
3271 (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3272 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3275 // Prepare list of oops for oop map generation.
3276 //
3277 // "offset" and "count" lists are describing the set of contiguous oop
3278 // regions. offset[i] is the start of the i-th region, which then has
3279 // count[i] oops following. Before we know how many regions are required,
3280 // we pessimistically allocate the maps to fit all the oops into the
3281 // distinct regions.
3282 //
3283 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3284 // to figure out if we still need to do this.
3285 int* nonstatic_oop_offsets;
3286 unsigned int* nonstatic_oop_counts;
3287 unsigned int nonstatic_oop_map_count = 0;
3288 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3290 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3291 THREAD, int, max_nonstatic_oop_maps);
3292 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3293 THREAD, unsigned int, max_nonstatic_oop_maps);
3295 first_nonstatic_oop_offset = 0; // will be set for first oop field
3297 bool compact_fields = CompactFields;
3298 int allocation_style = FieldsAllocationStyle;
3299 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3300 assert(false, "0 <= FieldsAllocationStyle <= 2");
3301 allocation_style = 1; // Optimistic
3302 }
3304 // The next classes have predefined hard-coded fields offsets
3305 // (see in JavaClasses::compute_hard_coded_offsets()).
3306 // Use default fields allocation order for them.
3307 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3308 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3309 _class_name == vmSymbols::java_lang_Class() ||
3310 _class_name == vmSymbols::java_lang_ClassLoader() ||
3311 _class_name == vmSymbols::java_lang_ref_Reference() ||
3312 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3313 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3314 _class_name == vmSymbols::java_lang_String() ||
3315 _class_name == vmSymbols::java_lang_Throwable() ||
3316 _class_name == vmSymbols::java_lang_Boolean() ||
3317 _class_name == vmSymbols::java_lang_Character() ||
3318 _class_name == vmSymbols::java_lang_Float() ||
3319 _class_name == vmSymbols::java_lang_Double() ||
3320 _class_name == vmSymbols::java_lang_Byte() ||
3321 _class_name == vmSymbols::java_lang_Short() ||
3322 _class_name == vmSymbols::java_lang_Integer() ||
3323 _class_name == vmSymbols::java_lang_Long())) {
3324 allocation_style = 0; // Allocate oops first
3325 compact_fields = false; // Don't compact fields
3326 }
3328 // Rearrange fields for a given allocation style
3329 if( allocation_style == 0 ) {
3330 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3331 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3332 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3333 (nonstatic_oop_count * heapOopSize);
3334 } else if( allocation_style == 1 ) {
3335 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3336 next_nonstatic_double_offset = next_nonstatic_field_offset;
3337 } else if( allocation_style == 2 ) {
3338 // Fields allocation: oops fields in super and sub classes are together.
3339 if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3340 _super_klass->nonstatic_oop_map_size() > 0 ) {
3341 unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3342 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3343 OopMapBlock* last_map = first_map + map_count - 1;
3344 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3345 if (next_offset == next_nonstatic_field_offset) {
3346 allocation_style = 0; // allocate oops first
3347 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3348 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3349 (nonstatic_oop_count * heapOopSize);
3350 }
3351 }
3352 if( allocation_style == 2 ) {
3353 allocation_style = 1; // allocate oops last
3354 next_nonstatic_double_offset = next_nonstatic_field_offset;
3355 }
3356 } else {
3357 ShouldNotReachHere();
3358 }
3360 int nonstatic_oop_space_count = 0;
3361 int nonstatic_word_space_count = 0;
3362 int nonstatic_short_space_count = 0;
3363 int nonstatic_byte_space_count = 0;
3364 int nonstatic_oop_space_offset = 0;
3365 int nonstatic_word_space_offset = 0;
3366 int nonstatic_short_space_offset = 0;
3367 int nonstatic_byte_space_offset = 0;
3369 // Try to squeeze some of the fields into the gaps due to
3370 // long/double alignment.
3371 if( nonstatic_double_count > 0 ) {
3372 int offset = next_nonstatic_double_offset;
3373 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3374 if( compact_fields && offset != next_nonstatic_double_offset ) {
3375 // Allocate available fields into the gap before double field.
3376 int length = next_nonstatic_double_offset - offset;
3377 assert(length == BytesPerInt, "");
3378 nonstatic_word_space_offset = offset;
3379 if( nonstatic_word_count > 0 ) {
3380 nonstatic_word_count -= 1;
3381 nonstatic_word_space_count = 1; // Only one will fit
3382 length -= BytesPerInt;
3383 offset += BytesPerInt;
3384 }
3385 nonstatic_short_space_offset = offset;
3386 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3387 nonstatic_short_count -= 1;
3388 nonstatic_short_space_count += 1;
3389 length -= BytesPerShort;
3390 offset += BytesPerShort;
3391 }
3392 nonstatic_byte_space_offset = offset;
3393 while( length > 0 && nonstatic_byte_count > 0 ) {
3394 nonstatic_byte_count -= 1;
3395 nonstatic_byte_space_count += 1;
3396 length -= 1;
3397 }
3398 // Allocate oop field in the gap if there are no other fields for that.
3399 nonstatic_oop_space_offset = offset;
3400 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3401 allocation_style != 0 ) { // when oop fields not first
3402 nonstatic_oop_count -= 1;
3403 nonstatic_oop_space_count = 1; // Only one will fit
3404 length -= heapOopSize;
3405 offset += heapOopSize;
3406 }
3407 }
3408 }
3410 next_nonstatic_word_offset = next_nonstatic_double_offset +
3411 (nonstatic_double_count * BytesPerLong);
3412 next_nonstatic_short_offset = next_nonstatic_word_offset +
3413 (nonstatic_word_count * BytesPerInt);
3414 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3415 (nonstatic_short_count * BytesPerShort);
3416 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3417 nonstatic_byte_count;
3419 // let oops jump before padding with this allocation style
3420 if( allocation_style == 1 ) {
3421 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3422 if( nonstatic_oop_count > 0 ) {
3423 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3424 }
3425 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3426 }
3428 // Iterate over fields again and compute correct offsets.
3429 // The field allocation type was temporarily stored in the offset slot.
3430 // oop fields are located before non-oop fields (static and non-static).
3431 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3433 // skip already laid out fields
3434 if (fs.is_offset_set()) continue;
3436 // contended instance fields are handled below
3437 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3439 int real_offset = 0;
3440 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3442 // pack the rest of the fields
3443 switch (atype) {
3444 case STATIC_OOP:
3445 real_offset = next_static_oop_offset;
3446 next_static_oop_offset += heapOopSize;
3447 break;
3448 case STATIC_BYTE:
3449 real_offset = next_static_byte_offset;
3450 next_static_byte_offset += 1;
3451 break;
3452 case STATIC_SHORT:
3453 real_offset = next_static_short_offset;
3454 next_static_short_offset += BytesPerShort;
3455 break;
3456 case STATIC_WORD:
3457 real_offset = next_static_word_offset;
3458 next_static_word_offset += BytesPerInt;
3459 break;
3460 case STATIC_DOUBLE:
3461 real_offset = next_static_double_offset;
3462 next_static_double_offset += BytesPerLong;
3463 break;
3464 case NONSTATIC_OOP:
3465 if( nonstatic_oop_space_count > 0 ) {
3466 real_offset = nonstatic_oop_space_offset;
3467 nonstatic_oop_space_offset += heapOopSize;
3468 nonstatic_oop_space_count -= 1;
3469 } else {
3470 real_offset = next_nonstatic_oop_offset;
3471 next_nonstatic_oop_offset += heapOopSize;
3472 }
3473 // Update oop maps
3474 if( nonstatic_oop_map_count > 0 &&
3475 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3476 real_offset -
3477 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3478 heapOopSize ) {
3479 // Extend current oop map
3480 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3481 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3482 } else {
3483 // Create new oop map
3484 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3485 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3486 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3487 nonstatic_oop_map_count += 1;
3488 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3489 first_nonstatic_oop_offset = real_offset;
3490 }
3491 }
3492 break;
3493 case NONSTATIC_BYTE:
3494 if( nonstatic_byte_space_count > 0 ) {
3495 real_offset = nonstatic_byte_space_offset;
3496 nonstatic_byte_space_offset += 1;
3497 nonstatic_byte_space_count -= 1;
3498 } else {
3499 real_offset = next_nonstatic_byte_offset;
3500 next_nonstatic_byte_offset += 1;
3501 }
3502 break;
3503 case NONSTATIC_SHORT:
3504 if( nonstatic_short_space_count > 0 ) {
3505 real_offset = nonstatic_short_space_offset;
3506 nonstatic_short_space_offset += BytesPerShort;
3507 nonstatic_short_space_count -= 1;
3508 } else {
3509 real_offset = next_nonstatic_short_offset;
3510 next_nonstatic_short_offset += BytesPerShort;
3511 }
3512 break;
3513 case NONSTATIC_WORD:
3514 if( nonstatic_word_space_count > 0 ) {
3515 real_offset = nonstatic_word_space_offset;
3516 nonstatic_word_space_offset += BytesPerInt;
3517 nonstatic_word_space_count -= 1;
3518 } else {
3519 real_offset = next_nonstatic_word_offset;
3520 next_nonstatic_word_offset += BytesPerInt;
3521 }
3522 break;
3523 case NONSTATIC_DOUBLE:
3524 real_offset = next_nonstatic_double_offset;
3525 next_nonstatic_double_offset += BytesPerLong;
3526 break;
3527 default:
3528 ShouldNotReachHere();
3529 }
3530 fs.set_offset(real_offset);
3531 }
3534 // Handle the contended cases.
3535 //
3536 // Each contended field should not intersect the cache line with another contended field.
3537 // In the absence of alignment information, we end up with pessimistically separating
3538 // the fields with full-width padding.
3539 //
3540 // Additionally, this should not break alignment for the fields, so we round the alignment up
3541 // for each field.
3542 if (nonstatic_contended_count > 0) {
3544 // if there is at least one contended field, we need to have pre-padding for them
3545 next_nonstatic_padded_offset += ContendedPaddingWidth;
3547 // collect all contended groups
3548 BitMap bm(_cp->size());
3549 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3550 // skip already laid out fields
3551 if (fs.is_offset_set()) continue;
3553 if (fs.is_contended()) {
3554 bm.set_bit(fs.contended_group());
3555 }
3556 }
3558 int current_group = -1;
3559 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3561 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3563 // skip already laid out fields
3564 if (fs.is_offset_set()) continue;
3566 // skip non-contended fields and fields from different group
3567 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3569 // handle statics below
3570 if (fs.access_flags().is_static()) continue;
3572 int real_offset = 0;
3573 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3575 switch (atype) {
3576 case NONSTATIC_BYTE:
3577 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3578 real_offset = next_nonstatic_padded_offset;
3579 next_nonstatic_padded_offset += 1;
3580 break;
3582 case NONSTATIC_SHORT:
3583 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3584 real_offset = next_nonstatic_padded_offset;
3585 next_nonstatic_padded_offset += BytesPerShort;
3586 break;
3588 case NONSTATIC_WORD:
3589 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3590 real_offset = next_nonstatic_padded_offset;
3591 next_nonstatic_padded_offset += BytesPerInt;
3592 break;
3594 case NONSTATIC_DOUBLE:
3595 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3596 real_offset = next_nonstatic_padded_offset;
3597 next_nonstatic_padded_offset += BytesPerLong;
3598 break;
3600 case NONSTATIC_OOP:
3601 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3602 real_offset = next_nonstatic_padded_offset;
3603 next_nonstatic_padded_offset += heapOopSize;
3605 // Create new oop map
3606 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3607 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3608 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3609 nonstatic_oop_map_count += 1;
3610 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3611 first_nonstatic_oop_offset = real_offset;
3612 }
3613 break;
3615 default:
3616 ShouldNotReachHere();
3617 }
3619 if (fs.contended_group() == 0) {
3620 // Contended group defines the equivalence class over the fields:
3621 // the fields within the same contended group are not inter-padded.
3622 // The only exception is default group, which does not incur the
3623 // equivalence, and so requires intra-padding.
3624 next_nonstatic_padded_offset += ContendedPaddingWidth;
3625 }
3627 fs.set_offset(real_offset);
3628 } // for
3630 // Start laying out the next group.
3631 // Note that this will effectively pad the last group in the back;
3632 // this is expected to alleviate memory contention effects for
3633 // subclass fields and/or adjacent object.
3634 // If this was the default group, the padding is already in place.
3635 if (current_group != 0) {
3636 next_nonstatic_padded_offset += ContendedPaddingWidth;
3637 }
3638 }
3640 // handle static fields
3641 }
3643 // Entire class is contended, pad in the back.
3644 // This helps to alleviate memory contention effects for subclass fields
3645 // and/or adjacent object.
3646 if (is_contended_class) {
3647 next_nonstatic_padded_offset += ContendedPaddingWidth;
3648 }
3650 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
3652 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
3653 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize);
3654 int static_fields_end = align_size_up(next_static_byte_offset, wordSize);
3656 int static_field_size = (static_fields_end -
3657 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3658 nonstatic_field_size = nonstatic_field_size +
3659 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
3661 int instance_size = align_object_size(instance_end / wordSize);
3663 assert(instance_size == align_object_size(align_size_up(
3664 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
3665 wordSize) / wordSize), "consistent layout helper value");
3667 // Invariant: nonstatic_field end/start should only change if there are
3668 // nonstatic fields in the class, or if the class is contended. We compare
3669 // against the non-aligned value, so that end alignment will not fail the
3670 // assert without actually having the fields.
3671 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
3672 is_contended_class ||
3673 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
3675 // Number of non-static oop map blocks allocated at end of klass.
3676 const unsigned int total_oop_map_count =
3677 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3678 first_nonstatic_oop_offset);
3680 #ifndef PRODUCT
3681 if (PrintFieldLayout) {
3682 print_field_layout(_class_name,
3683 _fields,
3684 _cp,
3685 instance_size,
3686 nonstatic_fields_start,
3687 nonstatic_fields_end,
3688 static_fields_end);
3689 }
3691 #endif
3692 // Pass back information needed for InstanceKlass creation
3693 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3694 info->nonstatic_oop_counts = nonstatic_oop_counts;
3695 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3696 info->total_oop_map_count = total_oop_map_count;
3697 info->instance_size = instance_size;
3698 info->static_field_size = static_field_size;
3699 info->nonstatic_field_size = nonstatic_field_size;
3700 info->has_nonstatic_fields = has_nonstatic_fields;
3701 }
3704 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3705 ClassLoaderData* loader_data,
3706 Handle protection_domain,
3707 KlassHandle host_klass,
3708 GrowableArray<Handle>* cp_patches,
3709 TempNewSymbol& parsed_name,
3710 bool verify,
3711 TRAPS) {
3713 // When a retransformable agent is attached, JVMTI caches the
3714 // class bytes that existed before the first retransformation.
3715 // If RedefineClasses() was used before the retransformable
3716 // agent attached, then the cached class bytes may not be the
3717 // original class bytes.
3718 JvmtiCachedClassFileData *cached_class_file = NULL;
3719 Handle class_loader(THREAD, loader_data->class_loader());
3720 bool has_default_methods = false;
3721 bool declares_default_methods = false;
3722 ResourceMark rm(THREAD);
3724 ClassFileStream* cfs = stream();
3725 // Timing
3726 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3727 JavaThread* jt = (JavaThread*) THREAD;
3729 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3730 ClassLoader::perf_class_parse_selftime(),
3731 NULL,
3732 jt->get_thread_stat()->perf_recursion_counts_addr(),
3733 jt->get_thread_stat()->perf_timers_addr(),
3734 PerfClassTraceTime::PARSE_CLASS);
3736 init_parsed_class_attributes(loader_data);
3738 if (JvmtiExport::should_post_class_file_load_hook()) {
3739 // Get the cached class file bytes (if any) from the class that
3740 // is being redefined or retransformed. We use jvmti_thread_state()
3741 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3742 // a JvmtiThreadState any earlier than necessary. This will help
3743 // avoid the bug described by 7126851.
3744 JvmtiThreadState *state = jt->jvmti_thread_state();
3745 if (state != NULL) {
3746 KlassHandle *h_class_being_redefined =
3747 state->get_class_being_redefined();
3748 if (h_class_being_redefined != NULL) {
3749 instanceKlassHandle ikh_class_being_redefined =
3750 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3751 cached_class_file = ikh_class_being_redefined->get_cached_class_file();
3752 }
3753 }
3755 unsigned char* ptr = cfs->buffer();
3756 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3758 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3759 &ptr, &end_ptr, &cached_class_file);
3761 if (ptr != cfs->buffer()) {
3762 // JVMTI agent has modified class file data.
3763 // Set new class file stream using JVMTI agent modified
3764 // class file data.
3765 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3766 set_stream(cfs);
3767 }
3768 }
3770 _host_klass = host_klass;
3771 _cp_patches = cp_patches;
3773 instanceKlassHandle nullHandle;
3775 // Figure out whether we can skip format checking (matching classic VM behavior)
3776 if (DumpSharedSpaces) {
3777 // verify == true means it's a 'remote' class (i.e., non-boot class)
3778 // Verification decision is based on BytecodeVerificationRemote flag
3779 // for those classes.
3780 _need_verify = (verify) ? BytecodeVerificationRemote :
3781 BytecodeVerificationLocal;
3782 } else {
3783 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3784 }
3786 // Set the verify flag in stream
3787 cfs->set_verify(_need_verify);
3789 // Save the class file name for easier error message printing.
3790 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3792 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3793 // Magic value
3794 u4 magic = cfs->get_u4_fast();
3795 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3796 "Incompatible magic value %u in class file %s",
3797 magic, CHECK_(nullHandle));
3799 // Version numbers
3800 u2 minor_version = cfs->get_u2_fast();
3801 u2 major_version = cfs->get_u2_fast();
3803 if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) {
3804 ResourceMark rm;
3805 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
3806 major_version, minor_version, name->as_C_string());
3807 Exceptions::fthrow(
3808 THREAD_AND_LOCATION,
3809 vmSymbols::java_lang_UnsupportedClassVersionError(),
3810 "Unsupported major.minor version for dump time %u.%u",
3811 major_version,
3812 minor_version);
3813 }
3815 // Check version numbers - we check this even with verifier off
3816 if (!is_supported_version(major_version, minor_version)) {
3817 if (name == NULL) {
3818 Exceptions::fthrow(
3819 THREAD_AND_LOCATION,
3820 vmSymbols::java_lang_UnsupportedClassVersionError(),
3821 "Unsupported class file version %u.%u, "
3822 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3823 major_version,
3824 minor_version,
3825 JAVA_MAX_SUPPORTED_VERSION,
3826 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3827 } else {
3828 ResourceMark rm(THREAD);
3829 Exceptions::fthrow(
3830 THREAD_AND_LOCATION,
3831 vmSymbols::java_lang_UnsupportedClassVersionError(),
3832 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
3833 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3834 name->as_C_string(),
3835 major_version,
3836 minor_version,
3837 JAVA_MAX_SUPPORTED_VERSION,
3838 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3839 }
3840 return nullHandle;
3841 }
3843 _major_version = major_version;
3844 _minor_version = minor_version;
3847 // Check if verification needs to be relaxed for this class file
3848 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3849 _relax_verify = Verifier::relax_verify_for(class_loader());
3851 // Constant pool
3852 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3854 int cp_size = cp->length();
3856 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3858 // Access flags
3859 AccessFlags access_flags;
3860 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3862 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3863 // Set abstract bit for old class files for backward compatibility
3864 flags |= JVM_ACC_ABSTRACT;
3865 }
3866 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3867 access_flags.set_flags(flags);
3869 // This class and superclass
3870 u2 this_class_index = cfs->get_u2_fast();
3871 check_property(
3872 valid_cp_range(this_class_index, cp_size) &&
3873 cp->tag_at(this_class_index).is_unresolved_klass(),
3874 "Invalid this class index %u in constant pool in class file %s",
3875 this_class_index, CHECK_(nullHandle));
3877 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
3878 assert(class_name != NULL, "class_name can't be null");
3880 // It's important to set parsed_name *before* resolving the super class.
3881 // (it's used for cleanup by the caller if parsing fails)
3882 parsed_name = class_name;
3883 // parsed_name is returned and can be used if there's an error, so add to
3884 // its reference count. Caller will decrement the refcount.
3885 parsed_name->increment_refcount();
3887 // Update _class_name which could be null previously to be class_name
3888 _class_name = class_name;
3890 // Don't need to check whether this class name is legal or not.
3891 // It has been checked when constant pool is parsed.
3892 // However, make sure it is not an array type.
3893 if (_need_verify) {
3894 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3895 "Bad class name in class file %s",
3896 CHECK_(nullHandle));
3897 }
3899 Klass* preserve_this_klass; // for storing result across HandleMark
3901 // release all handles when parsing is done
3902 { HandleMark hm(THREAD);
3904 // Checks if name in class file matches requested name
3905 if (name != NULL && class_name != name) {
3906 ResourceMark rm(THREAD);
3907 Exceptions::fthrow(
3908 THREAD_AND_LOCATION,
3909 vmSymbols::java_lang_NoClassDefFoundError(),
3910 "%s (wrong name: %s)",
3911 name->as_C_string(),
3912 class_name->as_C_string()
3913 );
3914 return nullHandle;
3915 }
3917 if (TraceClassLoadingPreorder) {
3918 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3919 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3920 tty->print_cr("]");
3921 }
3922 #if INCLUDE_CDS
3923 if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) {
3924 // Only dump the classes that can be stored into CDS archive
3925 if (SystemDictionaryShared::is_sharing_possible(loader_data)) {
3926 if (name != NULL) {
3927 ResourceMark rm(THREAD);
3928 classlist_file->print_cr("%s", name->as_C_string());
3929 classlist_file->flush();
3930 }
3931 }
3932 }
3933 #endif
3935 u2 super_class_index = cfs->get_u2_fast();
3936 instanceKlassHandle super_klass = parse_super_class(super_class_index,
3937 CHECK_NULL);
3939 // Interfaces
3940 u2 itfs_len = cfs->get_u2_fast();
3941 Array<Klass*>* local_interfaces =
3942 parse_interfaces(itfs_len, protection_domain, _class_name,
3943 &has_default_methods, CHECK_(nullHandle));
3945 u2 java_fields_count = 0;
3946 // Fields (offsets are filled in later)
3947 FieldAllocationCount fac;
3948 Array<u2>* fields = parse_fields(class_name,
3949 access_flags.is_interface(),
3950 &fac, &java_fields_count,
3951 CHECK_(nullHandle));
3952 // Methods
3953 bool has_final_method = false;
3954 AccessFlags promoted_flags;
3955 promoted_flags.set_flags(0);
3956 Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3957 &promoted_flags,
3958 &has_final_method,
3959 &declares_default_methods,
3960 CHECK_(nullHandle));
3961 if (declares_default_methods) {
3962 has_default_methods = true;
3963 }
3965 // Additional attributes
3966 ClassAnnotationCollector parsed_annotations;
3967 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
3969 // Finalize the Annotations metadata object,
3970 // now that all annotation arrays have been created.
3971 create_combined_annotations(CHECK_(nullHandle));
3973 // Make sure this is the end of class file stream
3974 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3976 if (_class_name == vmSymbols::java_lang_Object()) {
3977 check_property(_local_interfaces == Universe::the_empty_klass_array(),
3978 "java.lang.Object cannot implement an interface in class file %s",
3979 CHECK_(nullHandle));
3980 }
3981 // We check super class after class file is parsed and format is checked
3982 if (super_class_index > 0 && super_klass.is_null()) {
3983 Symbol* sk = cp->klass_name_at(super_class_index);
3984 if (access_flags.is_interface()) {
3985 // Before attempting to resolve the superclass, check for class format
3986 // errors not checked yet.
3987 guarantee_property(sk == vmSymbols::java_lang_Object(),
3988 "Interfaces must have java.lang.Object as superclass in class file %s",
3989 CHECK_(nullHandle));
3990 }
3991 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
3992 class_loader,
3993 protection_domain,
3994 true,
3995 CHECK_(nullHandle));
3997 KlassHandle kh (THREAD, k);
3998 super_klass = instanceKlassHandle(THREAD, kh());
3999 }
4000 if (super_klass.not_null()) {
4002 if (super_klass->has_default_methods()) {
4003 has_default_methods = true;
4004 }
4006 if (super_klass->is_interface()) {
4007 ResourceMark rm(THREAD);
4008 Exceptions::fthrow(
4009 THREAD_AND_LOCATION,
4010 vmSymbols::java_lang_IncompatibleClassChangeError(),
4011 "class %s has interface %s as super class",
4012 class_name->as_klass_external_name(),
4013 super_klass->external_name()
4014 );
4015 return nullHandle;
4016 }
4017 // Make sure super class is not final
4018 if (super_klass->is_final()) {
4019 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
4020 }
4021 }
4023 // save super klass for error handling.
4024 _super_klass = super_klass;
4026 // Compute the transitive list of all unique interfaces implemented by this class
4027 _transitive_interfaces =
4028 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
4030 // sort methods
4031 intArray* method_ordering = sort_methods(methods);
4033 // promote flags from parse_methods() to the klass' flags
4034 access_flags.add_promoted_flags(promoted_flags.as_int());
4036 // Size of Java vtable (in words)
4037 int vtable_size = 0;
4038 int itable_size = 0;
4039 int num_miranda_methods = 0;
4041 GrowableArray<Method*> all_mirandas(20);
4043 klassVtable::compute_vtable_size_and_num_mirandas(
4044 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
4045 access_flags, class_loader, class_name, local_interfaces,
4046 CHECK_(nullHandle));
4048 // Size of Java itable (in words)
4049 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
4051 FieldLayoutInfo info;
4052 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
4054 int total_oop_map_size2 =
4055 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
4057 // Compute reference type
4058 ReferenceType rt;
4059 if (super_klass() == NULL) {
4060 rt = REF_NONE;
4061 } else {
4062 rt = super_klass->reference_type();
4063 }
4065 // We can now create the basic Klass* for this klass
4066 _klass = InstanceKlass::allocate_instance_klass(loader_data,
4067 vtable_size,
4068 itable_size,
4069 info.static_field_size,
4070 total_oop_map_size2,
4071 rt,
4072 access_flags,
4073 name,
4074 super_klass(),
4075 !host_klass.is_null(),
4076 CHECK_(nullHandle));
4077 instanceKlassHandle this_klass (THREAD, _klass);
4079 assert(this_klass->static_field_size() == info.static_field_size, "sanity");
4080 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
4081 "sanity");
4083 // Fill in information already parsed
4084 this_klass->set_should_verify_class(verify);
4085 jint lh = Klass::instance_layout_helper(info.instance_size, false);
4086 this_klass->set_layout_helper(lh);
4087 assert(this_klass->oop_is_instance(), "layout is correct");
4088 assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
4089 // Not yet: supers are done below to support the new subtype-checking fields
4090 //this_klass->set_super(super_klass());
4091 this_klass->set_class_loader_data(loader_data);
4092 this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
4093 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
4094 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
4096 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
4098 if (has_final_method) {
4099 this_klass->set_has_final_method();
4100 }
4101 this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
4102 // The InstanceKlass::_methods_jmethod_ids cache
4103 // is managed on the assumption that the initial cache
4104 // size is equal to the number of methods in the class. If
4105 // that changes, then InstanceKlass::idnum_can_increment()
4106 // has to be changed accordingly.
4107 this_klass->set_initial_method_idnum(methods->length());
4108 this_klass->set_name(cp->klass_name_at(this_class_index));
4109 if (is_anonymous()) // I am well known to myself
4110 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4112 this_klass->set_minor_version(minor_version);
4113 this_klass->set_major_version(major_version);
4114 this_klass->set_has_default_methods(has_default_methods);
4115 this_klass->set_declares_default_methods(declares_default_methods);
4117 if (!host_klass.is_null()) {
4118 assert (this_klass->is_anonymous(), "should be the same");
4119 this_klass->set_host_klass(host_klass());
4120 }
4122 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4123 // (We used to do this lazily, but now we query it in Rewriter,
4124 // which is eagerly done for every method, so we might as well do it now,
4125 // when everything is fresh in memory.)
4126 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) {
4127 for (int j = 0; j < methods->length(); j++) {
4128 methods->at(j)->init_intrinsic_id();
4129 }
4130 }
4132 if (cached_class_file != NULL) {
4133 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4134 this_klass->set_cached_class_file(cached_class_file);
4135 }
4137 // Fill in field values obtained by parse_classfile_attributes
4138 if (parsed_annotations.has_any_annotations())
4139 parsed_annotations.apply_to(this_klass);
4140 apply_parsed_class_attributes(this_klass);
4142 // Miranda methods
4143 if ((num_miranda_methods > 0) ||
4144 // if this class introduced new miranda methods or
4145 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4146 // super class exists and this class inherited miranda methods
4147 ) {
4148 this_klass->set_has_miranda_methods(); // then set a flag
4149 }
4151 // Fill in information needed to compute superclasses.
4152 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4154 // Initialize itable offset tables
4155 klassItable::setup_itable_offset_table(this_klass);
4157 // Compute transitive closure of interfaces this class implements
4158 // Do final class setup
4159 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4161 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4162 set_precomputed_flags(this_klass);
4164 // reinitialize modifiers, using the InnerClasses attribute
4165 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4166 this_klass->set_modifier_flags(computed_modifiers);
4168 // check if this class can access its super class
4169 check_super_class_access(this_klass, CHECK_(nullHandle));
4171 // check if this class can access its superinterfaces
4172 check_super_interface_access(this_klass, CHECK_(nullHandle));
4174 // check if this class overrides any final method
4175 check_final_method_override(this_klass, CHECK_(nullHandle));
4177 // check that if this class is an interface then it doesn't have static methods
4178 if (this_klass->is_interface()) {
4179 /* An interface in a JAVA 8 classfile can be static */
4180 if (_major_version < JAVA_8_VERSION) {
4181 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4182 }
4183 }
4185 // Allocate mirror and initialize static fields
4186 java_lang_Class::create_mirror(this_klass, class_loader, protection_domain,
4187 CHECK_(nullHandle));
4189 // Generate any default methods - default methods are interface methods
4190 // that have a default implementation. This is new with Lambda project.
4191 if (has_default_methods ) {
4192 DefaultMethods::generate_default_methods(
4193 this_klass(), &all_mirandas, CHECK_(nullHandle));
4194 }
4196 // Update the loader_data graph.
4197 record_defined_class_dependencies(this_klass, CHECK_NULL);
4199 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4200 false /* not shared class */);
4202 if (TraceClassLoading) {
4203 ResourceMark rm;
4204 // print in a single call to reduce interleaving of output
4205 if (cfs->source() != NULL) {
4206 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4207 cfs->source());
4208 } else if (class_loader.is_null()) {
4209 Klass* caller =
4210 THREAD->is_Java_thread()
4211 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
4212 : NULL;
4213 // caller can be NULL, for example, during a JVMTI VM_Init hook
4214 if (caller != NULL) {
4215 tty->print("[Loaded %s by instance of %s]\n",
4216 this_klass->external_name(),
4217 InstanceKlass::cast(caller)->external_name());
4218 } else {
4219 tty->print("[Loaded %s]\n", this_klass->external_name());
4220 }
4221 } else {
4222 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4223 InstanceKlass::cast(class_loader->klass())->external_name());
4224 }
4225 }
4227 if (TraceClassResolution) {
4228 ResourceMark rm;
4229 // print out the superclass.
4230 const char * from = this_klass()->external_name();
4231 if (this_klass->java_super() != NULL) {
4232 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4233 }
4234 // print out each of the interface classes referred to by this class.
4235 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4236 if (local_interfaces != NULL) {
4237 int length = local_interfaces->length();
4238 for (int i = 0; i < length; i++) {
4239 Klass* k = local_interfaces->at(i);
4240 InstanceKlass* to_class = InstanceKlass::cast(k);
4241 const char * to = to_class->external_name();
4242 tty->print("RESOLVE %s %s (interface)\n", from, to);
4243 }
4244 }
4245 }
4247 // preserve result across HandleMark
4248 preserve_this_klass = this_klass();
4249 }
4251 // Create new handle outside HandleMark (might be needed for
4252 // Extended Class Redefinition)
4253 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4254 debug_only(this_klass->verify();)
4256 // Clear class if no error has occurred so destructor doesn't deallocate it
4257 _klass = NULL;
4258 return this_klass;
4259 }
4261 // Destructor to clean up if there's an error
4262 ClassFileParser::~ClassFileParser() {
4263 MetadataFactory::free_metadata(_loader_data, _cp);
4264 MetadataFactory::free_array<u2>(_loader_data, _fields);
4266 // Free methods
4267 InstanceKlass::deallocate_methods(_loader_data, _methods);
4269 // beware of the Universe::empty_blah_array!!
4270 if (_inner_classes != Universe::the_empty_short_array()) {
4271 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4272 }
4274 // Free interfaces
4275 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4276 _local_interfaces, _transitive_interfaces);
4278 if (_combined_annotations != NULL) {
4279 // After all annotations arrays have been created, they are installed into the
4280 // Annotations object that will be assigned to the InstanceKlass being created.
4282 // Deallocate the Annotations object and the installed annotations arrays.
4283 _combined_annotations->deallocate_contents(_loader_data);
4285 // If the _combined_annotations pointer is non-NULL,
4286 // then the other annotations fields should have been cleared.
4287 assert(_annotations == NULL, "Should have been cleared");
4288 assert(_type_annotations == NULL, "Should have been cleared");
4289 assert(_fields_annotations == NULL, "Should have been cleared");
4290 assert(_fields_type_annotations == NULL, "Should have been cleared");
4291 } else {
4292 // If the annotations arrays were not installed into the Annotations object,
4293 // then they have to be deallocated explicitly.
4294 MetadataFactory::free_array<u1>(_loader_data, _annotations);
4295 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4296 Annotations::free_contents(_loader_data, _fields_annotations);
4297 Annotations::free_contents(_loader_data, _fields_type_annotations);
4298 }
4300 clear_class_metadata();
4302 // deallocate the klass if already created. Don't directly deallocate, but add
4303 // to the deallocate list so that the klass is removed from the CLD::_klasses list
4304 // at a safepoint.
4305 if (_klass != NULL) {
4306 _loader_data->add_to_deallocate_list(_klass);
4307 }
4308 _klass = NULL;
4309 }
4311 void ClassFileParser::print_field_layout(Symbol* name,
4312 Array<u2>* fields,
4313 constantPoolHandle cp,
4314 int instance_size,
4315 int instance_fields_start,
4316 int instance_fields_end,
4317 int static_fields_end) {
4318 tty->print("%s: field layout\n", name->as_klass_external_name());
4319 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4320 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4321 if (!fs.access_flags().is_static()) {
4322 tty->print(" @%3d \"%s\" %s\n",
4323 fs.offset(),
4324 fs.name()->as_klass_external_name(),
4325 fs.signature()->as_klass_external_name());
4326 }
4327 }
4328 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4329 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4330 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4331 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4332 if (fs.access_flags().is_static()) {
4333 tty->print(" @%3d \"%s\" %s\n",
4334 fs.offset(),
4335 fs.name()->as_klass_external_name(),
4336 fs.signature()->as_klass_external_name());
4337 }
4338 }
4339 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4340 tty->print("\n");
4341 }
4343 unsigned int
4344 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4345 unsigned int nonstatic_oop_map_count,
4346 int first_nonstatic_oop_offset) {
4347 unsigned int map_count =
4348 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4349 if (nonstatic_oop_map_count > 0) {
4350 // We have oops to add to map
4351 if (map_count == 0) {
4352 map_count = nonstatic_oop_map_count;
4353 } else {
4354 // Check whether we should add a new map block or whether the last one can
4355 // be extended
4356 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4357 OopMapBlock* const last_map = first_map + map_count - 1;
4359 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4360 if (next_offset == first_nonstatic_oop_offset) {
4361 // There is no gap bettwen superklass's last oop field and first
4362 // local oop field, merge maps.
4363 nonstatic_oop_map_count -= 1;
4364 } else {
4365 // Superklass didn't end with a oop field, add extra maps
4366 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4367 }
4368 map_count += nonstatic_oop_map_count;
4369 }
4370 }
4371 return map_count;
4372 }
4375 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4376 unsigned int nonstatic_oop_map_count,
4377 int* nonstatic_oop_offsets,
4378 unsigned int* nonstatic_oop_counts) {
4379 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4380 const InstanceKlass* const super = k->superklass();
4381 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4382 if (super_count > 0) {
4383 // Copy maps from superklass
4384 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4385 for (unsigned int i = 0; i < super_count; ++i) {
4386 *this_oop_map++ = *super_oop_map++;
4387 }
4388 }
4390 if (nonstatic_oop_map_count > 0) {
4391 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4392 // The counts differ because there is no gap between superklass's last oop
4393 // field and the first local oop field. Extend the last oop map copied
4394 // from the superklass instead of creating new one.
4395 nonstatic_oop_map_count--;
4396 nonstatic_oop_offsets++;
4397 this_oop_map--;
4398 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4399 this_oop_map++;
4400 }
4402 // Add new map blocks, fill them
4403 while (nonstatic_oop_map_count-- > 0) {
4404 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4405 this_oop_map->set_count(*nonstatic_oop_counts++);
4406 this_oop_map++;
4407 }
4408 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4409 this_oop_map, "sanity");
4410 }
4411 }
4414 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4415 Klass* super = k->super();
4417 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4418 // in which case we don't have to register objects as finalizable
4419 if (!_has_empty_finalizer) {
4420 if (_has_finalizer ||
4421 (super != NULL && super->has_finalizer())) {
4422 k->set_has_finalizer();
4423 }
4424 }
4426 #ifdef ASSERT
4427 bool f = false;
4428 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4429 vmSymbols::void_method_signature());
4430 if (m != NULL && !m->is_empty_method()) {
4431 f = true;
4432 }
4434 // Spec doesn't prevent agent from redefinition of empty finalizer.
4435 // Despite the fact that it's generally bad idea and redefined finalizer
4436 // will not work as expected we shouldn't abort vm in this case
4437 if (!k->has_redefined_this_or_super()) {
4438 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4439 }
4440 #endif
4442 // Check if this klass supports the java.lang.Cloneable interface
4443 if (SystemDictionary::Cloneable_klass_loaded()) {
4444 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4445 k->set_is_cloneable();
4446 }
4447 }
4449 // Check if this klass has a vanilla default constructor
4450 if (super == NULL) {
4451 // java.lang.Object has empty default constructor
4452 k->set_has_vanilla_constructor();
4453 } else {
4454 if (super->has_vanilla_constructor() &&
4455 _has_vanilla_constructor) {
4456 k->set_has_vanilla_constructor();
4457 }
4458 #ifdef ASSERT
4459 bool v = false;
4460 if (super->has_vanilla_constructor()) {
4461 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4462 ), vmSymbols::void_method_signature());
4463 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4464 v = true;
4465 }
4466 }
4467 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4468 #endif
4469 }
4471 // If it cannot be fast-path allocated, set a bit in the layout helper.
4472 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4473 assert(k->size_helper() > 0, "layout_helper is initialized");
4474 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4475 || k->is_abstract() || k->is_interface()
4476 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4477 || k->size_helper() >= FastAllocateSizeLimit) {
4478 // Forbid fast-path allocation.
4479 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4480 k->set_layout_helper(lh);
4481 }
4482 }
4484 // Attach super classes and interface classes to class loader data
4485 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4486 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4487 if (defining_loader_data->is_the_null_class_loader_data()) {
4488 // Dependencies to null class loader data are implicit.
4489 return;
4490 } else {
4491 // add super class dependency
4492 Klass* super = defined_klass->super();
4493 if (super != NULL) {
4494 defining_loader_data->record_dependency(super, CHECK);
4495 }
4497 // add super interface dependencies
4498 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4499 if (local_interfaces != NULL) {
4500 int length = local_interfaces->length();
4501 for (int i = 0; i < length; i++) {
4502 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4503 }
4504 }
4505 }
4506 }
4508 // utility methods for appending an array with check for duplicates
4510 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4511 // iterate over new interfaces
4512 for (int i = 0; i < ifs->length(); i++) {
4513 Klass* e = ifs->at(i);
4514 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4515 // add new interface
4516 result->append_if_missing(e);
4517 }
4518 }
4520 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4521 instanceKlassHandle super,
4522 Array<Klass*>* local_ifs, TRAPS) {
4523 // Compute maximum size for transitive interfaces
4524 int max_transitive_size = 0;
4525 int super_size = 0;
4526 // Add superclass transitive interfaces size
4527 if (super.not_null()) {
4528 super_size = super->transitive_interfaces()->length();
4529 max_transitive_size += super_size;
4530 }
4531 // Add local interfaces' super interfaces
4532 int local_size = local_ifs->length();
4533 for (int i = 0; i < local_size; i++) {
4534 Klass* l = local_ifs->at(i);
4535 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4536 }
4537 // Finally add local interfaces
4538 max_transitive_size += local_size;
4539 // Construct array
4540 if (max_transitive_size == 0) {
4541 // no interfaces, use canonicalized array
4542 return Universe::the_empty_klass_array();
4543 } else if (max_transitive_size == super_size) {
4544 // no new local interfaces added, share superklass' transitive interface array
4545 return super->transitive_interfaces();
4546 } else if (max_transitive_size == local_size) {
4547 // only local interfaces added, share local interface array
4548 return local_ifs;
4549 } else {
4550 ResourceMark rm;
4551 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4553 // Copy down from superclass
4554 if (super.not_null()) {
4555 append_interfaces(result, super->transitive_interfaces());
4556 }
4558 // Copy down from local interfaces' superinterfaces
4559 for (int i = 0; i < local_ifs->length(); i++) {
4560 Klass* l = local_ifs->at(i);
4561 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4562 }
4563 // Finally add local interfaces
4564 append_interfaces(result, local_ifs);
4566 // length will be less than the max_transitive_size if duplicates were removed
4567 int length = result->length();
4568 assert(length <= max_transitive_size, "just checking");
4569 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4570 for (int i = 0; i < length; i++) {
4571 Klass* e = result->at(i);
4572 assert(e != NULL, "just checking");
4573 new_result->at_put(i, e);
4574 }
4575 return new_result;
4576 }
4577 }
4579 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4580 Klass* super = this_klass->super();
4581 if ((super != NULL) &&
4582 (!Reflection::verify_class_access(this_klass(), super, false))) {
4583 ResourceMark rm(THREAD);
4584 Exceptions::fthrow(
4585 THREAD_AND_LOCATION,
4586 vmSymbols::java_lang_IllegalAccessError(),
4587 "class %s cannot access its superclass %s",
4588 this_klass->external_name(),
4589 InstanceKlass::cast(super)->external_name()
4590 );
4591 return;
4592 }
4593 }
4596 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4597 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4598 int lng = local_interfaces->length();
4599 for (int i = lng - 1; i >= 0; i--) {
4600 Klass* k = local_interfaces->at(i);
4601 assert (k != NULL && k->is_interface(), "invalid interface");
4602 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4603 ResourceMark rm(THREAD);
4604 Exceptions::fthrow(
4605 THREAD_AND_LOCATION,
4606 vmSymbols::java_lang_IllegalAccessError(),
4607 "class %s cannot access its superinterface %s",
4608 this_klass->external_name(),
4609 InstanceKlass::cast(k)->external_name()
4610 );
4611 return;
4612 }
4613 }
4614 }
4617 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4618 Array<Method*>* methods = this_klass->methods();
4619 int num_methods = methods->length();
4621 // go thru each method and check if it overrides a final method
4622 for (int index = 0; index < num_methods; index++) {
4623 Method* m = methods->at(index);
4625 // skip private, static, and <init> methods
4626 if ((!m->is_private() && !m->is_static()) &&
4627 (m->name() != vmSymbols::object_initializer_name())) {
4629 Symbol* name = m->name();
4630 Symbol* signature = m->signature();
4631 Klass* k = this_klass->super();
4632 Method* super_m = NULL;
4633 while (k != NULL) {
4634 // skip supers that don't have final methods.
4635 if (k->has_final_method()) {
4636 // lookup a matching method in the super class hierarchy
4637 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4638 if (super_m == NULL) {
4639 break; // didn't find any match; get out
4640 }
4642 if (super_m->is_final() && !super_m->is_static() &&
4643 // matching method in super is final, and not static
4644 (Reflection::verify_field_access(this_klass(),
4645 super_m->method_holder(),
4646 super_m->method_holder(),
4647 super_m->access_flags(), false))
4648 // this class can access super final method and therefore override
4649 ) {
4650 ResourceMark rm(THREAD);
4651 Exceptions::fthrow(
4652 THREAD_AND_LOCATION,
4653 vmSymbols::java_lang_VerifyError(),
4654 "class %s overrides final method %s.%s",
4655 this_klass->external_name(),
4656 name->as_C_string(),
4657 signature->as_C_string()
4658 );
4659 return;
4660 }
4662 // continue to look from super_m's holder's super.
4663 k = super_m->method_holder()->super();
4664 continue;
4665 }
4667 k = k->super();
4668 }
4669 }
4670 }
4671 }
4674 // assumes that this_klass is an interface
4675 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4676 assert(this_klass->is_interface(), "not an interface");
4677 Array<Method*>* methods = this_klass->methods();
4678 int num_methods = methods->length();
4680 for (int index = 0; index < num_methods; index++) {
4681 Method* m = methods->at(index);
4682 // if m is static and not the init method, throw a verify error
4683 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4684 ResourceMark rm(THREAD);
4685 Exceptions::fthrow(
4686 THREAD_AND_LOCATION,
4687 vmSymbols::java_lang_VerifyError(),
4688 "Illegal static method %s in interface %s",
4689 m->name()->as_C_string(),
4690 this_klass->external_name()
4691 );
4692 return;
4693 }
4694 }
4695 }
4697 // utility methods for format checking
4699 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4700 if (!_need_verify) { return; }
4702 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4703 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4704 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4705 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4706 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4707 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4708 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4710 if ((is_abstract && is_final) ||
4711 (is_interface && !is_abstract) ||
4712 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4713 (!is_interface && major_gte_15 && is_annotation)) {
4714 ResourceMark rm(THREAD);
4715 Exceptions::fthrow(
4716 THREAD_AND_LOCATION,
4717 vmSymbols::java_lang_ClassFormatError(),
4718 "Illegal class modifiers in class %s: 0x%X",
4719 _class_name->as_C_string(), flags
4720 );
4721 return;
4722 }
4723 }
4725 bool ClassFileParser::has_illegal_visibility(jint flags) {
4726 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4727 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4728 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4730 return ((is_public && is_protected) ||
4731 (is_public && is_private) ||
4732 (is_protected && is_private));
4733 }
4735 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4736 u2 max_version =
4737 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4738 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4739 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4740 (major <= max_version) &&
4741 ((major != max_version) ||
4742 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4743 }
4745 void ClassFileParser::verify_legal_field_modifiers(
4746 jint flags, bool is_interface, TRAPS) {
4747 if (!_need_verify) { return; }
4749 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4750 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4751 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4752 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4753 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4754 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4755 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4756 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4757 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4759 bool is_illegal = false;
4761 if (is_interface) {
4762 if (!is_public || !is_static || !is_final || is_private ||
4763 is_protected || is_volatile || is_transient ||
4764 (major_gte_15 && is_enum)) {
4765 is_illegal = true;
4766 }
4767 } else { // not interface
4768 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4769 is_illegal = true;
4770 }
4771 }
4773 if (is_illegal) {
4774 ResourceMark rm(THREAD);
4775 Exceptions::fthrow(
4776 THREAD_AND_LOCATION,
4777 vmSymbols::java_lang_ClassFormatError(),
4778 "Illegal field modifiers in class %s: 0x%X",
4779 _class_name->as_C_string(), flags);
4780 return;
4781 }
4782 }
4784 void ClassFileParser::verify_legal_method_modifiers(
4785 jint flags, bool is_interface, Symbol* name, TRAPS) {
4786 if (!_need_verify) { return; }
4788 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4789 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4790 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4791 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4792 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4793 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4794 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4795 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4796 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4797 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4798 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4799 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4800 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4802 bool is_illegal = false;
4804 if (is_interface) {
4805 if (major_gte_8) {
4806 // Class file version is JAVA_8_VERSION or later Methods of
4807 // interfaces may set any of the flags except ACC_PROTECTED,
4808 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4809 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4810 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4811 (is_native || is_protected || is_final || is_synchronized) ||
4812 // If a specific method of a class or interface has its
4813 // ACC_ABSTRACT flag set, it must not have any of its
4814 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4815 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4816 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4817 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4818 (is_abstract && (is_private || is_static || is_strict))) {
4819 is_illegal = true;
4820 }
4821 } else if (major_gte_15) {
4822 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4823 if (!is_public || is_static || is_final || is_synchronized ||
4824 is_native || !is_abstract || is_strict) {
4825 is_illegal = true;
4826 }
4827 } else {
4828 // Class file version is pre-JAVA_1_5_VERSION
4829 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4830 is_illegal = true;
4831 }
4832 }
4833 } else { // not interface
4834 if (is_initializer) {
4835 if (is_static || is_final || is_synchronized || is_native ||
4836 is_abstract || (major_gte_15 && is_bridge)) {
4837 is_illegal = true;
4838 }
4839 } else { // not initializer
4840 if (is_abstract) {
4841 if ((is_final || is_native || is_private || is_static ||
4842 (major_gte_15 && (is_synchronized || is_strict)))) {
4843 is_illegal = true;
4844 }
4845 }
4846 if (has_illegal_visibility(flags)) {
4847 is_illegal = true;
4848 }
4849 }
4850 }
4852 if (is_illegal) {
4853 ResourceMark rm(THREAD);
4854 Exceptions::fthrow(
4855 THREAD_AND_LOCATION,
4856 vmSymbols::java_lang_ClassFormatError(),
4857 "Method %s in class %s has illegal modifiers: 0x%X",
4858 name->as_C_string(), _class_name->as_C_string(), flags);
4859 return;
4860 }
4861 }
4863 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4864 assert(_need_verify, "only called when _need_verify is true");
4865 int i = 0;
4866 int count = length >> 2;
4867 for (int k=0; k<count; k++) {
4868 unsigned char b0 = buffer[i];
4869 unsigned char b1 = buffer[i+1];
4870 unsigned char b2 = buffer[i+2];
4871 unsigned char b3 = buffer[i+3];
4872 // For an unsigned char v,
4873 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4874 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4875 unsigned char res = b0 | b0 - 1 |
4876 b1 | b1 - 1 |
4877 b2 | b2 - 1 |
4878 b3 | b3 - 1;
4879 if (res >= 128) break;
4880 i += 4;
4881 }
4882 for(; i < length; i++) {
4883 unsigned short c;
4884 // no embedded zeros
4885 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4886 if(buffer[i] < 128) {
4887 continue;
4888 }
4889 if ((i + 5) < length) { // see if it's legal supplementary character
4890 if (UTF8::is_supplementary_character(&buffer[i])) {
4891 c = UTF8::get_supplementary_character(&buffer[i]);
4892 i += 5;
4893 continue;
4894 }
4895 }
4896 switch (buffer[i] >> 4) {
4897 default: break;
4898 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4899 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4900 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4901 c = (buffer[i] & 0x1F) << 6;
4902 i++;
4903 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4904 c += buffer[i] & 0x3F;
4905 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4906 // for classes with major > 47, c must a null or a character in its shortest form
4907 break;
4908 }
4909 }
4910 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4911 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4912 c = (buffer[i] & 0xF) << 12;
4913 i += 2;
4914 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4915 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4916 if (_major_version <= 47 || c >= 0x800) {
4917 // for classes with major > 47, c must be in its shortest form
4918 break;
4919 }
4920 }
4921 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4922 } // end of switch
4923 } // end of for
4924 }
4926 // Checks if name is a legal class name.
4927 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4928 if (!_need_verify || _relax_verify) { return; }
4930 char buf[fixed_buffer_size];
4931 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4932 unsigned int length = name->utf8_length();
4933 bool legal = false;
4935 if (length > 0) {
4936 char* p;
4937 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4938 p = skip_over_field_signature(bytes, false, length, CHECK);
4939 legal = (p != NULL) && ((p - bytes) == (int)length);
4940 } else if (_major_version < JAVA_1_5_VERSION) {
4941 if (bytes[0] != '<') {
4942 p = skip_over_field_name(bytes, true, length);
4943 legal = (p != NULL) && ((p - bytes) == (int)length);
4944 }
4945 } else {
4946 // 4900761: relax the constraints based on JSR202 spec
4947 // Class names may be drawn from the entire Unicode character set.
4948 // Identifiers between '/' must be unqualified names.
4949 // The utf8 string has been verified when parsing cpool entries.
4950 legal = verify_unqualified_name(bytes, length, LegalClass);
4951 }
4952 }
4953 if (!legal) {
4954 ResourceMark rm(THREAD);
4955 Exceptions::fthrow(
4956 THREAD_AND_LOCATION,
4957 vmSymbols::java_lang_ClassFormatError(),
4958 "Illegal class name \"%s\" in class file %s", bytes,
4959 _class_name->as_C_string()
4960 );
4961 return;
4962 }
4963 }
4965 // Checks if name is a legal field name.
4966 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4967 if (!_need_verify || _relax_verify) { return; }
4969 char buf[fixed_buffer_size];
4970 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4971 unsigned int length = name->utf8_length();
4972 bool legal = false;
4974 if (length > 0) {
4975 if (_major_version < JAVA_1_5_VERSION) {
4976 if (bytes[0] != '<') {
4977 char* p = skip_over_field_name(bytes, false, length);
4978 legal = (p != NULL) && ((p - bytes) == (int)length);
4979 }
4980 } else {
4981 // 4881221: relax the constraints based on JSR202 spec
4982 legal = verify_unqualified_name(bytes, length, LegalField);
4983 }
4984 }
4986 if (!legal) {
4987 ResourceMark rm(THREAD);
4988 Exceptions::fthrow(
4989 THREAD_AND_LOCATION,
4990 vmSymbols::java_lang_ClassFormatError(),
4991 "Illegal field name \"%s\" in class %s", bytes,
4992 _class_name->as_C_string()
4993 );
4994 return;
4995 }
4996 }
4998 // Checks if name is a legal method name.
4999 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
5000 if (!_need_verify || _relax_verify) { return; }
5002 assert(name != NULL, "method name is null");
5003 char buf[fixed_buffer_size];
5004 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5005 unsigned int length = name->utf8_length();
5006 bool legal = false;
5008 if (length > 0) {
5009 if (bytes[0] == '<') {
5010 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5011 legal = true;
5012 }
5013 } else if (_major_version < JAVA_1_5_VERSION) {
5014 char* p;
5015 p = skip_over_field_name(bytes, false, length);
5016 legal = (p != NULL) && ((p - bytes) == (int)length);
5017 } else {
5018 // 4881221: relax the constraints based on JSR202 spec
5019 legal = verify_unqualified_name(bytes, length, LegalMethod);
5020 }
5021 }
5023 if (!legal) {
5024 ResourceMark rm(THREAD);
5025 Exceptions::fthrow(
5026 THREAD_AND_LOCATION,
5027 vmSymbols::java_lang_ClassFormatError(),
5028 "Illegal method name \"%s\" in class %s", bytes,
5029 _class_name->as_C_string()
5030 );
5031 return;
5032 }
5033 }
5036 // Checks if signature is a legal field signature.
5037 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
5038 if (!_need_verify) { return; }
5040 char buf[fixed_buffer_size];
5041 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5042 unsigned int length = signature->utf8_length();
5043 char* p = skip_over_field_signature(bytes, false, length, CHECK);
5045 if (p == NULL || (p - bytes) != (int)length) {
5046 throwIllegalSignature("Field", name, signature, CHECK);
5047 }
5048 }
5050 // Checks if signature is a legal method signature.
5051 // Returns number of parameters
5052 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
5053 if (!_need_verify) {
5054 // make sure caller's args_size will be less than 0 even for non-static
5055 // method so it will be recomputed in compute_size_of_parameters().
5056 return -2;
5057 }
5059 unsigned int args_size = 0;
5060 char buf[fixed_buffer_size];
5061 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5062 unsigned int length = signature->utf8_length();
5063 char* nextp;
5065 // The first character must be a '('
5066 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5067 length--;
5068 // Skip over legal field signatures
5069 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5070 while ((length > 0) && (nextp != NULL)) {
5071 args_size++;
5072 if (p[0] == 'J' || p[0] == 'D') {
5073 args_size++;
5074 }
5075 length -= nextp - p;
5076 p = nextp;
5077 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5078 }
5079 // The first non-signature thing better be a ')'
5080 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5081 length--;
5082 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5083 // All internal methods must return void
5084 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5085 return args_size;
5086 }
5087 } else {
5088 // Now we better just have a return value
5089 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5090 if (nextp && ((int)length == (nextp - p))) {
5091 return args_size;
5092 }
5093 }
5094 }
5095 }
5096 // Report error
5097 throwIllegalSignature("Method", name, signature, CHECK_0);
5098 return 0;
5099 }
5102 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5103 // Method names also may not contain the characters '<' or '>', unless <init>
5104 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5105 // method. Because these names have been checked as special cases before
5106 // calling this method in verify_legal_method_name.
5107 bool ClassFileParser::verify_unqualified_name(
5108 char* name, unsigned int length, int type) {
5109 jchar ch;
5111 for (char* p = name; p != name + length; ) {
5112 ch = *p;
5113 if (ch < 128) {
5114 p++;
5115 if (ch == '.' || ch == ';' || ch == '[' ) {
5116 return false; // do not permit '.', ';', or '['
5117 }
5118 if (type != LegalClass && ch == '/') {
5119 return false; // do not permit '/' unless it's class name
5120 }
5121 if (type == LegalMethod && (ch == '<' || ch == '>')) {
5122 return false; // do not permit '<' or '>' in method names
5123 }
5124 } else {
5125 char* tmp_p = UTF8::next(p, &ch);
5126 p = tmp_p;
5127 }
5128 }
5129 return true;
5130 }
5133 // Take pointer to a string. Skip over the longest part of the string that could
5134 // be taken as a fieldname. Allow '/' if slash_ok is true.
5135 // Return a pointer to just past the fieldname.
5136 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5137 // being true, we saw consecutive slashes (meaning we were looking for a
5138 // qualified path but found something that was badly-formed).
5139 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5140 char* p;
5141 jchar ch;
5142 jboolean last_is_slash = false;
5143 jboolean not_first_ch = false;
5145 for (p = name; p != name + length; not_first_ch = true) {
5146 char* old_p = p;
5147 ch = *p;
5148 if (ch < 128) {
5149 p++;
5150 // quick check for ascii
5151 if ((ch >= 'a' && ch <= 'z') ||
5152 (ch >= 'A' && ch <= 'Z') ||
5153 (ch == '_' || ch == '$') ||
5154 (not_first_ch && ch >= '0' && ch <= '9')) {
5155 last_is_slash = false;
5156 continue;
5157 }
5158 if (slash_ok && ch == '/') {
5159 if (last_is_slash) {
5160 return NULL; // Don't permit consecutive slashes
5161 }
5162 last_is_slash = true;
5163 continue;
5164 }
5165 } else {
5166 jint unicode_ch;
5167 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5168 p = tmp_p;
5169 last_is_slash = false;
5170 // Check if ch is Java identifier start or is Java identifier part
5171 // 4672820: call java.lang.Character methods directly without generating separate tables.
5172 EXCEPTION_MARK;
5173 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5175 // return value
5176 JavaValue result(T_BOOLEAN);
5177 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5178 JavaCallArguments args;
5179 args.push_int(unicode_ch);
5181 // public static boolean isJavaIdentifierStart(char ch);
5182 JavaCalls::call_static(&result,
5183 klass,
5184 vmSymbols::isJavaIdentifierStart_name(),
5185 vmSymbols::int_bool_signature(),
5186 &args,
5187 THREAD);
5189 if (HAS_PENDING_EXCEPTION) {
5190 CLEAR_PENDING_EXCEPTION;
5191 return 0;
5192 }
5193 if (result.get_jboolean()) {
5194 continue;
5195 }
5197 if (not_first_ch) {
5198 // public static boolean isJavaIdentifierPart(char ch);
5199 JavaCalls::call_static(&result,
5200 klass,
5201 vmSymbols::isJavaIdentifierPart_name(),
5202 vmSymbols::int_bool_signature(),
5203 &args,
5204 THREAD);
5206 if (HAS_PENDING_EXCEPTION) {
5207 CLEAR_PENDING_EXCEPTION;
5208 return 0;
5209 }
5211 if (result.get_jboolean()) {
5212 continue;
5213 }
5214 }
5215 }
5216 return (not_first_ch) ? old_p : NULL;
5217 }
5218 return (not_first_ch) ? p : NULL;
5219 }
5222 // Take pointer to a string. Skip over the longest part of the string that could
5223 // be taken as a field signature. Allow "void" if void_ok.
5224 // Return a pointer to just past the signature.
5225 // Return NULL if no legal signature is found.
5226 char* ClassFileParser::skip_over_field_signature(char* signature,
5227 bool void_ok,
5228 unsigned int length,
5229 TRAPS) {
5230 unsigned int array_dim = 0;
5231 while (length > 0) {
5232 switch (signature[0]) {
5233 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5234 case JVM_SIGNATURE_BOOLEAN:
5235 case JVM_SIGNATURE_BYTE:
5236 case JVM_SIGNATURE_CHAR:
5237 case JVM_SIGNATURE_SHORT:
5238 case JVM_SIGNATURE_INT:
5239 case JVM_SIGNATURE_FLOAT:
5240 case JVM_SIGNATURE_LONG:
5241 case JVM_SIGNATURE_DOUBLE:
5242 return signature + 1;
5243 case JVM_SIGNATURE_CLASS: {
5244 if (_major_version < JAVA_1_5_VERSION) {
5245 // Skip over the class name if one is there
5246 char* p = skip_over_field_name(signature + 1, true, --length);
5248 // The next character better be a semicolon
5249 if (p && (p - signature) > 1 && p[0] == ';') {
5250 return p + 1;
5251 }
5252 } else {
5253 // 4900761: For class version > 48, any unicode is allowed in class name.
5254 length--;
5255 signature++;
5256 while (length > 0 && signature[0] != ';') {
5257 if (signature[0] == '.') {
5258 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5259 }
5260 length--;
5261 signature++;
5262 }
5263 if (signature[0] == ';') { return signature + 1; }
5264 }
5266 return NULL;
5267 }
5268 case JVM_SIGNATURE_ARRAY:
5269 array_dim++;
5270 if (array_dim > 255) {
5271 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5272 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5273 }
5274 // The rest of what's there better be a legal signature
5275 signature++;
5276 length--;
5277 void_ok = false;
5278 break;
5280 default:
5281 return NULL;
5282 }
5283 }
5284 return NULL;
5285 }