Mon, 06 Feb 2017 23:36:58 +0300
8153134: Infinite loop in handle_wrong_method in jmod
Summary: Use Patching_lock to synchronize access between set_code() and clear_code().
Reviewed-by: kvn, dlong
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 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
948 parse_annotations(runtime_visible_annotations,
949 runtime_visible_annotations_length,
950 parsed_annotations,
951 CHECK);
952 cfs->skip_u1_fast(runtime_visible_annotations_length);
953 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
954 runtime_invisible_annotations_length = attribute_length;
955 runtime_invisible_annotations = cfs->get_u1_buffer();
956 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
957 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
958 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
959 if (runtime_visible_type_annotations != NULL) {
960 classfile_parse_error(
961 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
962 }
963 runtime_visible_type_annotations_length = attribute_length;
964 runtime_visible_type_annotations = cfs->get_u1_buffer();
965 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
966 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
967 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
968 if (runtime_invisible_type_annotations_exists) {
969 classfile_parse_error(
970 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
971 } else {
972 runtime_invisible_type_annotations_exists = true;
973 }
974 if (PreserveAllAnnotations) {
975 runtime_invisible_type_annotations_length = attribute_length;
976 runtime_invisible_type_annotations = cfs->get_u1_buffer();
977 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
978 }
979 cfs->skip_u1(attribute_length, CHECK);
980 } else {
981 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
982 }
983 } else {
984 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
985 }
986 }
988 *constantvalue_index_addr = constantvalue_index;
989 *is_synthetic_addr = is_synthetic;
990 *generic_signature_index_addr = generic_signature_index;
991 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
992 runtime_visible_annotations_length,
993 runtime_invisible_annotations,
994 runtime_invisible_annotations_length,
995 CHECK);
996 parsed_annotations->set_field_annotations(a);
997 a = assemble_annotations(runtime_visible_type_annotations,
998 runtime_visible_type_annotations_length,
999 runtime_invisible_type_annotations,
1000 runtime_invisible_type_annotations_length,
1001 CHECK);
1002 parsed_annotations->set_field_type_annotations(a);
1003 return;
1004 }
1007 // Field allocation types. Used for computing field offsets.
1009 enum FieldAllocationType {
1010 STATIC_OOP, // Oops
1011 STATIC_BYTE, // Boolean, Byte, char
1012 STATIC_SHORT, // shorts
1013 STATIC_WORD, // ints
1014 STATIC_DOUBLE, // aligned long or double
1015 NONSTATIC_OOP,
1016 NONSTATIC_BYTE,
1017 NONSTATIC_SHORT,
1018 NONSTATIC_WORD,
1019 NONSTATIC_DOUBLE,
1020 MAX_FIELD_ALLOCATION_TYPE,
1021 BAD_ALLOCATION_TYPE = -1
1022 };
1024 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1025 BAD_ALLOCATION_TYPE, // 0
1026 BAD_ALLOCATION_TYPE, // 1
1027 BAD_ALLOCATION_TYPE, // 2
1028 BAD_ALLOCATION_TYPE, // 3
1029 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1030 NONSTATIC_SHORT, // T_CHAR = 5,
1031 NONSTATIC_WORD, // T_FLOAT = 6,
1032 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1033 NONSTATIC_BYTE, // T_BYTE = 8,
1034 NONSTATIC_SHORT, // T_SHORT = 9,
1035 NONSTATIC_WORD, // T_INT = 10,
1036 NONSTATIC_DOUBLE, // T_LONG = 11,
1037 NONSTATIC_OOP, // T_OBJECT = 12,
1038 NONSTATIC_OOP, // T_ARRAY = 13,
1039 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1040 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1041 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1042 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1043 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1044 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1045 BAD_ALLOCATION_TYPE, // 0
1046 BAD_ALLOCATION_TYPE, // 1
1047 BAD_ALLOCATION_TYPE, // 2
1048 BAD_ALLOCATION_TYPE, // 3
1049 STATIC_BYTE , // T_BOOLEAN = 4,
1050 STATIC_SHORT, // T_CHAR = 5,
1051 STATIC_WORD, // T_FLOAT = 6,
1052 STATIC_DOUBLE, // T_DOUBLE = 7,
1053 STATIC_BYTE, // T_BYTE = 8,
1054 STATIC_SHORT, // T_SHORT = 9,
1055 STATIC_WORD, // T_INT = 10,
1056 STATIC_DOUBLE, // T_LONG = 11,
1057 STATIC_OOP, // T_OBJECT = 12,
1058 STATIC_OOP, // T_ARRAY = 13,
1059 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1060 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1061 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1062 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1063 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1064 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1065 };
1067 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1068 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1069 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1070 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1071 return result;
1072 }
1074 class FieldAllocationCount: public ResourceObj {
1075 public:
1076 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1078 FieldAllocationCount() {
1079 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1080 count[i] = 0;
1081 }
1082 }
1084 FieldAllocationType update(bool is_static, BasicType type) {
1085 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1086 // Make sure there is no overflow with injected fields.
1087 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1088 count[atype]++;
1089 return atype;
1090 }
1091 };
1093 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name,
1094 bool is_interface,
1095 FieldAllocationCount *fac,
1096 u2* java_fields_count_ptr, TRAPS) {
1097 ClassFileStream* cfs = stream();
1098 cfs->guarantee_more(2, CHECK_NULL); // length
1099 u2 length = cfs->get_u2_fast();
1100 *java_fields_count_ptr = length;
1102 int num_injected = 0;
1103 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1104 int total_fields = length + num_injected;
1106 // The field array starts with tuples of shorts
1107 // [access, name index, sig index, initial value index, byte offset].
1108 // A generic signature slot only exists for field with generic
1109 // signature attribute. And the access flag is set with
1110 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1111 // signature slots are at the end of the field array and after all
1112 // other fields data.
1113 //
1114 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1115 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1116 // ...
1117 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1118 // [generic signature index]
1119 // [generic signature index]
1120 // ...
1121 //
1122 // Allocate a temporary resource array for field data. For each field,
1123 // a slot is reserved in the temporary array for the generic signature
1124 // index. After parsing all fields, the data are copied to a permanent
1125 // array and any unused slots will be discarded.
1126 ResourceMark rm(THREAD);
1127 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1128 THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1130 // The generic signature slots start after all other fields' data.
1131 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1132 int num_generic_signature = 0;
1133 for (int n = 0; n < length; n++) {
1134 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count
1136 AccessFlags access_flags;
1137 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1138 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1139 access_flags.set_flags(flags);
1141 u2 name_index = cfs->get_u2_fast();
1142 int cp_size = _cp->length();
1143 check_property(valid_symbol_at(name_index),
1144 "Invalid constant pool index %u for field name in class file %s",
1145 name_index,
1146 CHECK_NULL);
1147 Symbol* name = _cp->symbol_at(name_index);
1148 verify_legal_field_name(name, CHECK_NULL);
1150 u2 signature_index = cfs->get_u2_fast();
1151 check_property(valid_symbol_at(signature_index),
1152 "Invalid constant pool index %u for field signature in class file %s",
1153 signature_index, CHECK_NULL);
1154 Symbol* sig = _cp->symbol_at(signature_index);
1155 verify_legal_field_signature(name, sig, CHECK_NULL);
1157 u2 constantvalue_index = 0;
1158 bool is_synthetic = false;
1159 u2 generic_signature_index = 0;
1160 bool is_static = access_flags.is_static();
1161 FieldAnnotationCollector parsed_annotations(_loader_data);
1163 u2 attributes_count = cfs->get_u2_fast();
1164 if (attributes_count > 0) {
1165 parse_field_attributes(attributes_count, is_static, signature_index,
1166 &constantvalue_index, &is_synthetic,
1167 &generic_signature_index, &parsed_annotations,
1168 CHECK_NULL);
1169 if (parsed_annotations.field_annotations() != NULL) {
1170 if (_fields_annotations == NULL) {
1171 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1172 _loader_data, length, NULL,
1173 CHECK_NULL);
1174 }
1175 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1176 parsed_annotations.set_field_annotations(NULL);
1177 }
1178 if (parsed_annotations.field_type_annotations() != NULL) {
1179 if (_fields_type_annotations == NULL) {
1180 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1181 _loader_data, length, NULL,
1182 CHECK_NULL);
1183 }
1184 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1185 parsed_annotations.set_field_type_annotations(NULL);
1186 }
1188 if (is_synthetic) {
1189 access_flags.set_is_synthetic();
1190 }
1191 if (generic_signature_index != 0) {
1192 access_flags.set_field_has_generic_signature();
1193 fa[generic_signature_slot] = generic_signature_index;
1194 generic_signature_slot ++;
1195 num_generic_signature ++;
1196 }
1197 }
1199 FieldInfo* field = FieldInfo::from_field_array(fa, n);
1200 field->initialize(access_flags.as_short(),
1201 name_index,
1202 signature_index,
1203 constantvalue_index);
1204 BasicType type = _cp->basic_type_for_signature_at(signature_index);
1206 // Remember how many oops we encountered and compute allocation type
1207 FieldAllocationType atype = fac->update(is_static, type);
1208 field->set_allocation_type(atype);
1210 // After field is initialized with type, we can augment it with aux info
1211 if (parsed_annotations.has_any_annotations())
1212 parsed_annotations.apply_to(field);
1213 }
1215 int index = length;
1216 if (num_injected != 0) {
1217 for (int n = 0; n < num_injected; n++) {
1218 // Check for duplicates
1219 if (injected[n].may_be_java) {
1220 Symbol* name = injected[n].name();
1221 Symbol* signature = injected[n].signature();
1222 bool duplicate = false;
1223 for (int i = 0; i < length; i++) {
1224 FieldInfo* f = FieldInfo::from_field_array(fa, i);
1225 if (name == _cp->symbol_at(f->name_index()) &&
1226 signature == _cp->symbol_at(f->signature_index())) {
1227 // Symbol is desclared in Java so skip this one
1228 duplicate = true;
1229 break;
1230 }
1231 }
1232 if (duplicate) {
1233 // These will be removed from the field array at the end
1234 continue;
1235 }
1236 }
1238 // Injected field
1239 FieldInfo* field = FieldInfo::from_field_array(fa, index);
1240 field->initialize(JVM_ACC_FIELD_INTERNAL,
1241 injected[n].name_index,
1242 injected[n].signature_index,
1243 0);
1245 BasicType type = FieldType::basic_type(injected[n].signature());
1247 // Remember how many oops we encountered and compute allocation type
1248 FieldAllocationType atype = fac->update(false, type);
1249 field->set_allocation_type(atype);
1250 index++;
1251 }
1252 }
1254 // Now copy the fields' data from the temporary resource array.
1255 // Sometimes injected fields already exist in the Java source so
1256 // the fields array could be too long. In that case the
1257 // fields array is trimed. Also unused slots that were reserved
1258 // for generic signature indexes are discarded.
1259 Array<u2>* fields = MetadataFactory::new_array<u2>(
1260 _loader_data, index * FieldInfo::field_slots + num_generic_signature,
1261 CHECK_NULL);
1262 _fields = fields; // save in case of error
1263 {
1264 int i = 0;
1265 for (; i < index * FieldInfo::field_slots; i++) {
1266 fields->at_put(i, fa[i]);
1267 }
1268 for (int j = total_fields * FieldInfo::field_slots;
1269 j < generic_signature_slot; j++) {
1270 fields->at_put(i++, fa[j]);
1271 }
1272 assert(i == fields->length(), "");
1273 }
1275 if (_need_verify && length > 1) {
1276 // Check duplicated fields
1277 ResourceMark rm(THREAD);
1278 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1279 THREAD, NameSigHash*, HASH_ROW_SIZE);
1280 initialize_hashtable(names_and_sigs);
1281 bool dup = false;
1282 {
1283 debug_only(No_Safepoint_Verifier nsv;)
1284 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) {
1285 Symbol* name = fs.name();
1286 Symbol* sig = fs.signature();
1287 // If no duplicates, add name/signature in hashtable names_and_sigs.
1288 if (!put_after_lookup(name, sig, names_and_sigs)) {
1289 dup = true;
1290 break;
1291 }
1292 }
1293 }
1294 if (dup) {
1295 classfile_parse_error("Duplicate field name&signature in class file %s",
1296 CHECK_NULL);
1297 }
1298 }
1300 return fields;
1301 }
1304 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1305 while (length-- > 0) {
1306 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1307 }
1308 }
1311 u2* ClassFileParser::parse_exception_table(u4 code_length,
1312 u4 exception_table_length,
1313 TRAPS) {
1314 ClassFileStream* cfs = stream();
1316 u2* exception_table_start = cfs->get_u2_buffer();
1317 assert(exception_table_start != NULL, "null exception table");
1318 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1319 // Will check legal target after parsing code array in verifier.
1320 if (_need_verify) {
1321 for (unsigned int i = 0; i < exception_table_length; i++) {
1322 u2 start_pc = cfs->get_u2_fast();
1323 u2 end_pc = cfs->get_u2_fast();
1324 u2 handler_pc = cfs->get_u2_fast();
1325 u2 catch_type_index = cfs->get_u2_fast();
1326 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1327 "Illegal exception table range in class file %s",
1328 CHECK_NULL);
1329 guarantee_property(handler_pc < code_length,
1330 "Illegal exception table handler in class file %s",
1331 CHECK_NULL);
1332 if (catch_type_index != 0) {
1333 guarantee_property(valid_klass_reference_at(catch_type_index),
1334 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1335 }
1336 }
1337 } else {
1338 cfs->skip_u2_fast(exception_table_length * 4);
1339 }
1340 return exception_table_start;
1341 }
1343 void ClassFileParser::parse_linenumber_table(
1344 u4 code_attribute_length, u4 code_length,
1345 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1346 ClassFileStream* cfs = stream();
1347 unsigned int num_entries = cfs->get_u2(CHECK);
1349 // Each entry is a u2 start_pc, and a u2 line_number
1350 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1352 // Verify line number attribute and table length
1353 check_property(
1354 code_attribute_length == sizeof(u2) + length_in_bytes,
1355 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1357 cfs->guarantee_more(length_in_bytes, CHECK);
1359 if ((*write_stream) == NULL) {
1360 if (length_in_bytes > fixed_buffer_size) {
1361 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1362 } else {
1363 (*write_stream) = new CompressedLineNumberWriteStream(
1364 linenumbertable_buffer, fixed_buffer_size);
1365 }
1366 }
1368 while (num_entries-- > 0) {
1369 u2 bci = cfs->get_u2_fast(); // start_pc
1370 u2 line = cfs->get_u2_fast(); // line_number
1371 guarantee_property(bci < code_length,
1372 "Invalid pc in LineNumberTable in class file %s", CHECK);
1373 (*write_stream)->write_pair(bci, line);
1374 }
1375 }
1378 // Class file LocalVariableTable elements.
1379 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1380 public:
1381 u2 start_bci;
1382 u2 length;
1383 u2 name_cp_index;
1384 u2 descriptor_cp_index;
1385 u2 slot;
1386 };
1389 class LVT_Hash: public CHeapObj<mtClass> {
1390 public:
1391 LocalVariableTableElement *_elem; // element
1392 LVT_Hash* _next; // Next entry in hash table
1393 };
1395 unsigned int hash(LocalVariableTableElement *elem) {
1396 unsigned int raw_hash = elem->start_bci;
1398 raw_hash = elem->length + raw_hash * 37;
1399 raw_hash = elem->name_cp_index + raw_hash * 37;
1400 raw_hash = elem->slot + raw_hash * 37;
1402 return raw_hash % HASH_ROW_SIZE;
1403 }
1405 void initialize_hashtable(LVT_Hash** table) {
1406 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1407 table[i] = NULL;
1408 }
1409 }
1411 void clear_hashtable(LVT_Hash** table) {
1412 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1413 LVT_Hash* current = table[i];
1414 LVT_Hash* next;
1415 while (current != NULL) {
1416 next = current->_next;
1417 current->_next = NULL;
1418 delete(current);
1419 current = next;
1420 }
1421 table[i] = NULL;
1422 }
1423 }
1425 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1426 LVT_Hash* entry = table[index];
1428 /*
1429 * 3-tuple start_bci/length/slot has to be unique key,
1430 * so the following comparison seems to be redundant:
1431 * && elem->name_cp_index == entry->_elem->name_cp_index
1432 */
1433 while (entry != NULL) {
1434 if (elem->start_bci == entry->_elem->start_bci
1435 && elem->length == entry->_elem->length
1436 && elem->name_cp_index == entry->_elem->name_cp_index
1437 && elem->slot == entry->_elem->slot
1438 ) {
1439 return entry;
1440 }
1441 entry = entry->_next;
1442 }
1443 return NULL;
1444 }
1446 // Return false if the local variable is found in table.
1447 // Return true if no duplicate is found.
1448 // And local variable is added as a new entry in table.
1449 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1450 // First lookup for duplicates
1451 int index = hash(elem);
1452 LVT_Hash* entry = LVT_lookup(elem, index, table);
1454 if (entry != NULL) {
1455 return false;
1456 }
1457 // No duplicate is found, allocate a new entry and fill it.
1458 if ((entry = new LVT_Hash()) == NULL) {
1459 return false;
1460 }
1461 entry->_elem = elem;
1463 // Insert into hash table
1464 entry->_next = table[index];
1465 table[index] = entry;
1467 return true;
1468 }
1470 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1471 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1472 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1473 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1474 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1475 lvt->signature_cp_index = 0;
1476 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1477 }
1479 // Function is used to parse both attributes:
1480 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1481 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1482 u2 max_locals,
1483 u4 code_attribute_length,
1484 u2* localvariable_table_length,
1485 bool isLVTT,
1486 TRAPS) {
1487 ClassFileStream* cfs = stream();
1488 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1489 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1490 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1491 // Verify local variable table attribute has right length
1492 if (_need_verify) {
1493 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1494 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1495 }
1496 u2* localvariable_table_start = cfs->get_u2_buffer();
1497 assert(localvariable_table_start != NULL, "null local variable table");
1498 if (!_need_verify) {
1499 cfs->skip_u2_fast(size);
1500 } else {
1501 cfs->guarantee_more(size * 2, CHECK_NULL);
1502 for(int i = 0; i < (*localvariable_table_length); i++) {
1503 u2 start_pc = cfs->get_u2_fast();
1504 u2 length = cfs->get_u2_fast();
1505 u2 name_index = cfs->get_u2_fast();
1506 u2 descriptor_index = cfs->get_u2_fast();
1507 u2 index = cfs->get_u2_fast();
1508 // Assign to a u4 to avoid overflow
1509 u4 end_pc = (u4)start_pc + (u4)length;
1511 if (start_pc >= code_length) {
1512 classfile_parse_error(
1513 "Invalid start_pc %u in %s in class file %s",
1514 start_pc, tbl_name, CHECK_NULL);
1515 }
1516 if (end_pc > code_length) {
1517 classfile_parse_error(
1518 "Invalid length %u in %s in class file %s",
1519 length, tbl_name, CHECK_NULL);
1520 }
1521 int cp_size = _cp->length();
1522 guarantee_property(valid_symbol_at(name_index),
1523 "Name index %u in %s has bad constant type in class file %s",
1524 name_index, tbl_name, CHECK_NULL);
1525 guarantee_property(valid_symbol_at(descriptor_index),
1526 "Signature index %u in %s has bad constant type in class file %s",
1527 descriptor_index, tbl_name, CHECK_NULL);
1529 Symbol* name = _cp->symbol_at(name_index);
1530 Symbol* sig = _cp->symbol_at(descriptor_index);
1531 verify_legal_field_name(name, CHECK_NULL);
1532 u2 extra_slot = 0;
1533 if (!isLVTT) {
1534 verify_legal_field_signature(name, sig, CHECK_NULL);
1536 // 4894874: check special cases for double and long local variables
1537 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1538 sig == vmSymbols::type_signature(T_LONG)) {
1539 extra_slot = 1;
1540 }
1541 }
1542 guarantee_property((index + extra_slot) < max_locals,
1543 "Invalid index %u in %s in class file %s",
1544 index, tbl_name, CHECK_NULL);
1545 }
1546 }
1547 return localvariable_table_start;
1548 }
1551 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1552 u1* u1_array, u2* u2_array, TRAPS) {
1553 ClassFileStream* cfs = stream();
1554 u2 index = 0; // index in the array with long/double occupying two slots
1555 u4 i1 = *u1_index;
1556 u4 i2 = *u2_index + 1;
1557 for(int i = 0; i < array_length; i++) {
1558 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1559 index++;
1560 if (tag == ITEM_Long || tag == ITEM_Double) {
1561 index++;
1562 } else if (tag == ITEM_Object) {
1563 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1564 guarantee_property(valid_klass_reference_at(class_index),
1565 "Bad class index %u in StackMap in class file %s",
1566 class_index, CHECK);
1567 } else if (tag == ITEM_Uninitialized) {
1568 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1569 guarantee_property(
1570 offset < code_length,
1571 "Bad uninitialized type offset %u in StackMap in class file %s",
1572 offset, CHECK);
1573 } else {
1574 guarantee_property(
1575 tag <= (u1)ITEM_Uninitialized,
1576 "Unknown variable type %u in StackMap in class file %s",
1577 tag, CHECK);
1578 }
1579 }
1580 u2_array[*u2_index] = index;
1581 *u1_index = i1;
1582 *u2_index = i2;
1583 }
1585 u1* ClassFileParser::parse_stackmap_table(
1586 u4 code_attribute_length, TRAPS) {
1587 if (code_attribute_length == 0)
1588 return NULL;
1590 ClassFileStream* cfs = stream();
1591 u1* stackmap_table_start = cfs->get_u1_buffer();
1592 assert(stackmap_table_start != NULL, "null stackmap table");
1594 // check code_attribute_length first
1595 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1597 if (!_need_verify && !DumpSharedSpaces) {
1598 return NULL;
1599 }
1600 return stackmap_table_start;
1601 }
1603 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1604 u4 method_attribute_length,
1605 TRAPS) {
1606 ClassFileStream* cfs = stream();
1607 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1608 *checked_exceptions_length = cfs->get_u2_fast();
1609 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1610 u2* checked_exceptions_start = cfs->get_u2_buffer();
1611 assert(checked_exceptions_start != NULL, "null checked exceptions");
1612 if (!_need_verify) {
1613 cfs->skip_u2_fast(size);
1614 } else {
1615 // Verify each value in the checked exception table
1616 u2 checked_exception;
1617 u2 len = *checked_exceptions_length;
1618 cfs->guarantee_more(2 * len, CHECK_NULL);
1619 for (int i = 0; i < len; i++) {
1620 checked_exception = cfs->get_u2_fast();
1621 check_property(
1622 valid_klass_reference_at(checked_exception),
1623 "Exception name has bad type at constant pool %u in class file %s",
1624 checked_exception, CHECK_NULL);
1625 }
1626 }
1627 // check exceptions attribute length
1628 if (_need_verify) {
1629 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1630 sizeof(u2) * size),
1631 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1632 }
1633 return checked_exceptions_start;
1634 }
1636 void ClassFileParser::throwIllegalSignature(
1637 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1638 ResourceMark rm(THREAD);
1639 Exceptions::fthrow(THREAD_AND_LOCATION,
1640 vmSymbols::java_lang_ClassFormatError(),
1641 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1642 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1643 }
1645 // Skip an annotation. Return >=limit if there is any problem.
1646 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1647 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1648 // value := switch (tag:u1) { ... }
1649 index += 2; // skip atype
1650 if ((index += 2) >= limit) return limit; // read nmem
1651 int nmem = Bytes::get_Java_u2(buffer+index-2);
1652 while (--nmem >= 0 && index < limit) {
1653 index += 2; // skip member
1654 index = skip_annotation_value(buffer, limit, index);
1655 }
1656 return index;
1657 }
1659 // Safely increment index by val if does not pass limit
1660 #define SAFE_ADD(index, limit, val) \
1661 if (index >= limit - val) return limit; \
1662 index += val;
1664 // Skip an annotation value. Return >=limit if there is any problem.
1665 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1666 // value := switch (tag:u1) {
1667 // case B, C, I, S, Z, D, F, J, c: con:u2;
1668 // case e: e_class:u2 e_name:u2;
1669 // case s: s_con:u2;
1670 // case [: do(nval:u2) {value};
1671 // case @: annotation;
1672 // case s: s_con:u2;
1673 // }
1674 SAFE_ADD(index, limit, 1); // read tag
1675 u1 tag = buffer[index-1];
1676 switch (tag) {
1677 case 'B': case 'C': case 'I': case 'S': case 'Z':
1678 case 'D': case 'F': case 'J': case 'c': case 's':
1679 SAFE_ADD(index, limit, 2); // skip con or s_con
1680 break;
1681 case 'e':
1682 SAFE_ADD(index, limit, 4); // skip e_class, e_name
1683 break;
1684 case '[':
1685 {
1686 SAFE_ADD(index, limit, 2); // read nval
1687 int nval = Bytes::get_Java_u2(buffer+index-2);
1688 while (--nval >= 0 && index < limit) {
1689 index = skip_annotation_value(buffer, limit, index);
1690 }
1691 }
1692 break;
1693 case '@':
1694 index = skip_annotation(buffer, limit, index);
1695 break;
1696 default:
1697 assert(false, "annotation tag");
1698 return limit; // bad tag byte
1699 }
1700 return index;
1701 }
1703 // Sift through annotations, looking for those significant to the VM:
1704 void ClassFileParser::parse_annotations(u1* buffer, int limit,
1705 ClassFileParser::AnnotationCollector* coll,
1706 TRAPS) {
1707 // annotations := do(nann:u2) {annotation}
1708 int index = 2;
1709 if (index >= limit) return; // read nann
1710 int nann = Bytes::get_Java_u2(buffer+index-2);
1711 enum { // initial annotation layout
1712 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1713 count_off = 2, // u2 such as 1 (one value)
1714 member_off = 4, // utf8 such as 'value'
1715 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1716 e_tag_val = 'e',
1717 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1718 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1719 e_size = 11, // end of 'e' annotation
1720 c_tag_val = 'c', // payload is type
1721 c_con_off = 7, // utf8 payload, such as 'I'
1722 c_size = 9, // end of 'c' annotation
1723 s_tag_val = 's', // payload is String
1724 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1725 s_size = 9,
1726 min_size = 6 // smallest possible size (zero members)
1727 };
1728 // Cannot add min_size to index in case of overflow MAX_INT
1729 while ((--nann) >= 0 && (index-2 <= limit - min_size)) {
1730 int index0 = index;
1731 index = skip_annotation(buffer, limit, index);
1732 u1* abase = buffer + index0;
1733 int atype = Bytes::get_Java_u2(abase + atype_off);
1734 int count = Bytes::get_Java_u2(abase + count_off);
1735 Symbol* aname = check_symbol_at(_cp, atype);
1736 if (aname == NULL) break; // invalid annotation name
1737 Symbol* member = NULL;
1738 if (count >= 1) {
1739 int member_index = Bytes::get_Java_u2(abase + member_off);
1740 member = check_symbol_at(_cp, member_index);
1741 if (member == NULL) break; // invalid member name
1742 }
1744 // Here is where parsing particular annotations will take place.
1745 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname);
1746 if (id == AnnotationCollector::_unknown) continue;
1747 coll->set_annotation(id);
1749 if (id == AnnotationCollector::_sun_misc_Contended) {
1750 // @Contended can optionally specify the contention group.
1751 //
1752 // Contended group defines the equivalence class over the fields:
1753 // the fields within the same contended group are not treated distinct.
1754 // The only exception is default group, which does not incur the
1755 // equivalence. Naturally, contention group for classes is meaningless.
1756 //
1757 // While the contention group is specified as String, annotation
1758 // values are already interned, and we might as well use the constant
1759 // pool index as the group tag.
1760 //
1761 u2 group_index = 0; // default contended group
1762 if (count == 1
1763 && s_size == (index - index0) // match size
1764 && s_tag_val == *(abase + tag_off)
1765 && member == vmSymbols::value_name()) {
1766 group_index = Bytes::get_Java_u2(abase + s_con_off);
1767 if (_cp->symbol_at(group_index)->utf8_length() == 0) {
1768 group_index = 0; // default contended group
1769 }
1770 }
1771 coll->set_contended_group(group_index);
1772 }
1773 }
1774 }
1776 ClassFileParser::AnnotationCollector::ID
1777 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1778 Symbol* name) {
1779 vmSymbols::SID sid = vmSymbols::find_sid(name);
1780 // Privileged code can use all annotations. Other code silently drops some.
1781 const bool privileged = loader_data->is_the_null_class_loader_data() ||
1782 loader_data->is_ext_class_loader_data() ||
1783 loader_data->is_anonymous();
1784 switch (sid) {
1785 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature):
1786 if (_location != _in_method) break; // only allow for methods
1787 if (!privileged) break; // only allow in privileged code
1788 return _method_CallerSensitive;
1789 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1790 if (_location != _in_method) break; // only allow for methods
1791 if (!privileged) break; // only allow in privileged code
1792 return _method_ForceInline;
1793 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1794 if (_location != _in_method) break; // only allow for methods
1795 if (!privileged) break; // only allow in privileged code
1796 return _method_DontInline;
1797 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature):
1798 if (_location != _in_method) break; // only allow for methods
1799 if (!privileged) break; // only allow in privileged code
1800 return _method_InjectedProfile;
1801 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1802 if (_location != _in_method) break; // only allow for methods
1803 if (!privileged) break; // only allow in privileged code
1804 return _method_LambdaForm_Compiled;
1805 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1806 if (_location != _in_method) break; // only allow for methods
1807 if (!privileged) break; // only allow in privileged code
1808 return _method_LambdaForm_Hidden;
1809 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature):
1810 if (_location != _in_field) break; // only allow for fields
1811 if (!privileged) break; // only allow in privileged code
1812 return _field_Stable;
1813 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1814 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1815 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1816 return _sun_misc_Contended;
1817 default: break;
1818 }
1819 return AnnotationCollector::_unknown;
1820 }
1822 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1823 if (is_contended())
1824 f->set_contended_group(contended_group());
1825 if (is_stable())
1826 f->set_stable(true);
1827 }
1829 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1830 // If there's an error deallocate metadata for field annotations
1831 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1832 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1833 }
1835 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1836 if (has_annotation(_method_CallerSensitive))
1837 m->set_caller_sensitive(true);
1838 if (has_annotation(_method_ForceInline))
1839 m->set_force_inline(true);
1840 if (has_annotation(_method_DontInline))
1841 m->set_dont_inline(true);
1842 if (has_annotation(_method_InjectedProfile))
1843 m->set_has_injected_profile(true);
1844 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1845 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1846 if (has_annotation(_method_LambdaForm_Hidden))
1847 m->set_hidden(true);
1848 }
1850 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1851 k->set_is_contended(is_contended());
1852 }
1855 #define MAX_ARGS_SIZE 255
1856 #define MAX_CODE_SIZE 65535
1857 #define INITIAL_MAX_LVT_NUMBER 256
1859 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1860 *
1861 * Rules for LVT's and LVTT's are:
1862 * - There can be any number of LVT's and LVTT's.
1863 * - If there are n LVT's, it is the same as if there was just
1864 * one LVT containing all the entries from the n LVT's.
1865 * - There may be no more than one LVT entry per local variable.
1866 * Two LVT entries are 'equal' if these fields are the same:
1867 * start_pc, length, name, slot
1868 * - There may be no more than one LVTT entry per each LVT entry.
1869 * Each LVTT entry has to match some LVT entry.
1870 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1871 */
1872 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1873 int lvt_cnt,
1874 u2* localvariable_table_length,
1875 u2** localvariable_table_start,
1876 int lvtt_cnt,
1877 u2* localvariable_type_table_length,
1878 u2** localvariable_type_table_start,
1879 TRAPS) {
1881 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1882 initialize_hashtable(lvt_Hash);
1884 // To fill LocalVariableTable in
1885 Classfile_LVT_Element* cf_lvt;
1886 LocalVariableTableElement* lvt = cm->localvariable_table_start();
1888 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1889 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1890 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1891 copy_lvt_element(&cf_lvt[idx], lvt);
1892 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1893 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1894 && _need_verify
1895 && _major_version >= JAVA_1_5_VERSION) {
1896 clear_hashtable(lvt_Hash);
1897 classfile_parse_error("Duplicated LocalVariableTable attribute "
1898 "entry for '%s' in class file %s",
1899 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1900 CHECK);
1901 }
1902 }
1903 }
1905 // To merge LocalVariableTable and LocalVariableTypeTable
1906 Classfile_LVT_Element* cf_lvtt;
1907 LocalVariableTableElement lvtt_elem;
1909 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1910 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1911 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1912 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1913 int index = hash(&lvtt_elem);
1914 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1915 if (entry == NULL) {
1916 if (_need_verify) {
1917 clear_hashtable(lvt_Hash);
1918 classfile_parse_error("LVTT entry for '%s' in class file %s "
1919 "does not match any LVT entry",
1920 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1921 CHECK);
1922 }
1923 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1924 clear_hashtable(lvt_Hash);
1925 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1926 "entry for '%s' in class file %s",
1927 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1928 CHECK);
1929 } else {
1930 // to add generic signatures into LocalVariableTable
1931 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1932 }
1933 }
1934 }
1935 clear_hashtable(lvt_Hash);
1936 }
1939 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1940 u1* runtime_visible_annotations,
1941 int runtime_visible_annotations_length,
1942 u1* runtime_invisible_annotations,
1943 int runtime_invisible_annotations_length,
1944 u1* runtime_visible_parameter_annotations,
1945 int runtime_visible_parameter_annotations_length,
1946 u1* runtime_invisible_parameter_annotations,
1947 int runtime_invisible_parameter_annotations_length,
1948 u1* runtime_visible_type_annotations,
1949 int runtime_visible_type_annotations_length,
1950 u1* runtime_invisible_type_annotations,
1951 int runtime_invisible_type_annotations_length,
1952 u1* annotation_default,
1953 int annotation_default_length,
1954 TRAPS) {
1956 AnnotationArray* a;
1958 if (runtime_visible_annotations_length +
1959 runtime_invisible_annotations_length > 0) {
1960 a = assemble_annotations(runtime_visible_annotations,
1961 runtime_visible_annotations_length,
1962 runtime_invisible_annotations,
1963 runtime_invisible_annotations_length,
1964 CHECK);
1965 cm->set_method_annotations(a);
1966 }
1968 if (runtime_visible_parameter_annotations_length +
1969 runtime_invisible_parameter_annotations_length > 0) {
1970 a = assemble_annotations(runtime_visible_parameter_annotations,
1971 runtime_visible_parameter_annotations_length,
1972 runtime_invisible_parameter_annotations,
1973 runtime_invisible_parameter_annotations_length,
1974 CHECK);
1975 cm->set_parameter_annotations(a);
1976 }
1978 if (annotation_default_length > 0) {
1979 a = assemble_annotations(annotation_default,
1980 annotation_default_length,
1981 NULL,
1982 0,
1983 CHECK);
1984 cm->set_default_annotations(a);
1985 }
1987 if (runtime_visible_type_annotations_length +
1988 runtime_invisible_type_annotations_length > 0) {
1989 a = assemble_annotations(runtime_visible_type_annotations,
1990 runtime_visible_type_annotations_length,
1991 runtime_invisible_type_annotations,
1992 runtime_invisible_type_annotations_length,
1993 CHECK);
1994 cm->set_type_annotations(a);
1995 }
1996 }
1999 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2000 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2001 // Method* to save footprint, so we only know the size of the resulting Method* when the
2002 // entire method attribute is parsed.
2003 //
2004 // The promoted_flags parameter is used to pass relevant access_flags
2005 // from the method back up to the containing klass. These flag values
2006 // are added to klass's access_flags.
2008 methodHandle ClassFileParser::parse_method(bool is_interface,
2009 AccessFlags *promoted_flags,
2010 TRAPS) {
2011 ClassFileStream* cfs = stream();
2012 methodHandle nullHandle;
2013 ResourceMark rm(THREAD);
2014 // Parse fixed parts
2015 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
2017 int flags = cfs->get_u2_fast();
2018 u2 name_index = cfs->get_u2_fast();
2019 int cp_size = _cp->length();
2020 check_property(
2021 valid_symbol_at(name_index),
2022 "Illegal constant pool index %u for method name in class file %s",
2023 name_index, CHECK_(nullHandle));
2024 Symbol* name = _cp->symbol_at(name_index);
2025 verify_legal_method_name(name, CHECK_(nullHandle));
2027 u2 signature_index = cfs->get_u2_fast();
2028 guarantee_property(
2029 valid_symbol_at(signature_index),
2030 "Illegal constant pool index %u for method signature in class file %s",
2031 signature_index, CHECK_(nullHandle));
2032 Symbol* signature = _cp->symbol_at(signature_index);
2034 AccessFlags access_flags;
2035 if (name == vmSymbols::class_initializer_name()) {
2036 // We ignore the other access flags for a valid class initializer.
2037 // (JVM Spec 2nd ed., chapter 4.6)
2038 if (_major_version < 51) { // backward compatibility
2039 flags = JVM_ACC_STATIC;
2040 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2041 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2042 }
2043 } else {
2044 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
2045 }
2047 int args_size = -1; // only used when _need_verify is true
2048 if (_need_verify) {
2049 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2050 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
2051 if (args_size > MAX_ARGS_SIZE) {
2052 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
2053 }
2054 }
2056 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2058 // Default values for code and exceptions attribute elements
2059 u2 max_stack = 0;
2060 u2 max_locals = 0;
2061 u4 code_length = 0;
2062 u1* code_start = 0;
2063 u2 exception_table_length = 0;
2064 u2* exception_table_start = NULL;
2065 Array<int>* exception_handlers = Universe::the_empty_int_array();
2066 u2 checked_exceptions_length = 0;
2067 u2* checked_exceptions_start = NULL;
2068 CompressedLineNumberWriteStream* linenumber_table = NULL;
2069 int linenumber_table_length = 0;
2070 int total_lvt_length = 0;
2071 u2 lvt_cnt = 0;
2072 u2 lvtt_cnt = 0;
2073 bool lvt_allocated = false;
2074 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2075 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2076 u2* localvariable_table_length;
2077 u2** localvariable_table_start;
2078 u2* localvariable_type_table_length;
2079 u2** localvariable_type_table_start;
2080 u2 method_parameters_length = 0;
2081 u1* method_parameters_data = NULL;
2082 bool method_parameters_seen = false;
2083 bool parsed_code_attribute = false;
2084 bool parsed_checked_exceptions_attribute = false;
2085 bool parsed_stackmap_attribute = false;
2086 // stackmap attribute - JDK1.5
2087 u1* stackmap_data = NULL;
2088 int stackmap_data_length = 0;
2089 u2 generic_signature_index = 0;
2090 MethodAnnotationCollector parsed_annotations;
2091 u1* runtime_visible_annotations = NULL;
2092 int runtime_visible_annotations_length = 0;
2093 u1* runtime_invisible_annotations = NULL;
2094 int runtime_invisible_annotations_length = 0;
2095 u1* runtime_visible_parameter_annotations = NULL;
2096 int runtime_visible_parameter_annotations_length = 0;
2097 u1* runtime_invisible_parameter_annotations = NULL;
2098 int runtime_invisible_parameter_annotations_length = 0;
2099 u1* runtime_visible_type_annotations = NULL;
2100 int runtime_visible_type_annotations_length = 0;
2101 u1* runtime_invisible_type_annotations = NULL;
2102 int runtime_invisible_type_annotations_length = 0;
2103 bool runtime_invisible_type_annotations_exists = false;
2104 u1* annotation_default = NULL;
2105 int annotation_default_length = 0;
2107 // Parse code and exceptions attribute
2108 u2 method_attributes_count = cfs->get_u2_fast();
2109 while (method_attributes_count--) {
2110 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
2111 u2 method_attribute_name_index = cfs->get_u2_fast();
2112 u4 method_attribute_length = cfs->get_u4_fast();
2113 check_property(
2114 valid_symbol_at(method_attribute_name_index),
2115 "Invalid method attribute name index %u in class file %s",
2116 method_attribute_name_index, CHECK_(nullHandle));
2118 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2119 if (method_attribute_name == vmSymbols::tag_code()) {
2120 // Parse Code attribute
2121 if (_need_verify) {
2122 guarantee_property(
2123 !access_flags.is_native() && !access_flags.is_abstract(),
2124 "Code attribute in native or abstract methods in class file %s",
2125 CHECK_(nullHandle));
2126 }
2127 if (parsed_code_attribute) {
2128 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2129 }
2130 parsed_code_attribute = true;
2132 // Stack size, locals size, and code size
2133 if (_major_version == 45 && _minor_version <= 2) {
2134 cfs->guarantee_more(4, CHECK_(nullHandle));
2135 max_stack = cfs->get_u1_fast();
2136 max_locals = cfs->get_u1_fast();
2137 code_length = cfs->get_u2_fast();
2138 } else {
2139 cfs->guarantee_more(8, CHECK_(nullHandle));
2140 max_stack = cfs->get_u2_fast();
2141 max_locals = cfs->get_u2_fast();
2142 code_length = cfs->get_u4_fast();
2143 }
2144 if (_need_verify) {
2145 guarantee_property(args_size <= max_locals,
2146 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2147 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2148 "Invalid method Code length %u in class file %s",
2149 code_length, CHECK_(nullHandle));
2150 }
2151 // Code pointer
2152 code_start = cfs->get_u1_buffer();
2153 assert(code_start != NULL, "null code start");
2154 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2155 cfs->skip_u1_fast(code_length);
2157 // Exception handler table
2158 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2159 exception_table_length = cfs->get_u2_fast();
2160 if (exception_table_length > 0) {
2161 exception_table_start =
2162 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2163 }
2165 // Parse additional attributes in code attribute
2166 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2167 u2 code_attributes_count = cfs->get_u2_fast();
2169 unsigned int calculated_attribute_length = 0;
2171 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2172 calculated_attribute_length =
2173 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2174 } else {
2175 // max_stack, locals and length are smaller in pre-version 45.2 classes
2176 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2177 }
2178 calculated_attribute_length +=
2179 code_length +
2180 sizeof(exception_table_length) +
2181 sizeof(code_attributes_count) +
2182 exception_table_length *
2183 ( sizeof(u2) + // start_pc
2184 sizeof(u2) + // end_pc
2185 sizeof(u2) + // handler_pc
2186 sizeof(u2) ); // catch_type_index
2188 while (code_attributes_count--) {
2189 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2190 u2 code_attribute_name_index = cfs->get_u2_fast();
2191 u4 code_attribute_length = cfs->get_u4_fast();
2192 calculated_attribute_length += code_attribute_length +
2193 sizeof(code_attribute_name_index) +
2194 sizeof(code_attribute_length);
2195 check_property(valid_symbol_at(code_attribute_name_index),
2196 "Invalid code attribute name index %u in class file %s",
2197 code_attribute_name_index,
2198 CHECK_(nullHandle));
2199 if (LoadLineNumberTables &&
2200 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2201 // Parse and compress line number table
2202 parse_linenumber_table(code_attribute_length, code_length,
2203 &linenumber_table, CHECK_(nullHandle));
2205 } else if (LoadLocalVariableTables &&
2206 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2207 // Parse local variable table
2208 if (!lvt_allocated) {
2209 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2210 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2211 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2212 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2213 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2214 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2215 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2216 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2217 lvt_allocated = true;
2218 }
2219 if (lvt_cnt == max_lvt_cnt) {
2220 max_lvt_cnt <<= 1;
2221 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2222 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2223 }
2224 localvariable_table_start[lvt_cnt] =
2225 parse_localvariable_table(code_length,
2226 max_locals,
2227 code_attribute_length,
2228 &localvariable_table_length[lvt_cnt],
2229 false, // is not LVTT
2230 CHECK_(nullHandle));
2231 total_lvt_length += localvariable_table_length[lvt_cnt];
2232 lvt_cnt++;
2233 } else if (LoadLocalVariableTypeTables &&
2234 _major_version >= JAVA_1_5_VERSION &&
2235 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2236 if (!lvt_allocated) {
2237 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2238 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2239 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2240 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2241 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2242 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2243 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2244 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2245 lvt_allocated = true;
2246 }
2247 // Parse local variable type table
2248 if (lvtt_cnt == max_lvtt_cnt) {
2249 max_lvtt_cnt <<= 1;
2250 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2251 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2252 }
2253 localvariable_type_table_start[lvtt_cnt] =
2254 parse_localvariable_table(code_length,
2255 max_locals,
2256 code_attribute_length,
2257 &localvariable_type_table_length[lvtt_cnt],
2258 true, // is LVTT
2259 CHECK_(nullHandle));
2260 lvtt_cnt++;
2261 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2262 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2263 // Stack map is only needed by the new verifier in JDK1.5.
2264 if (parsed_stackmap_attribute) {
2265 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2266 }
2267 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2268 stackmap_data_length = code_attribute_length;
2269 parsed_stackmap_attribute = true;
2270 } else {
2271 // Skip unknown attributes
2272 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2273 }
2274 }
2275 // check method attribute length
2276 if (_need_verify) {
2277 guarantee_property(method_attribute_length == calculated_attribute_length,
2278 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2279 }
2280 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2281 // Parse Exceptions attribute
2282 if (parsed_checked_exceptions_attribute) {
2283 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2284 }
2285 parsed_checked_exceptions_attribute = true;
2286 checked_exceptions_start =
2287 parse_checked_exceptions(&checked_exceptions_length,
2288 method_attribute_length,
2289 CHECK_(nullHandle));
2290 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2291 // reject multiple method parameters
2292 if (method_parameters_seen) {
2293 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2294 }
2295 method_parameters_seen = true;
2296 method_parameters_length = cfs->get_u1_fast();
2297 if (method_attribute_length != (method_parameters_length * 4u) + 1u) {
2298 classfile_parse_error(
2299 "Invalid MethodParameters method attribute length %u in class file",
2300 method_attribute_length, CHECK_(nullHandle));
2301 }
2302 method_parameters_data = cfs->get_u1_buffer();
2303 cfs->skip_u2_fast(method_parameters_length);
2304 cfs->skip_u2_fast(method_parameters_length);
2305 // ignore this attribute if it cannot be reflected
2306 if (!SystemDictionary::Parameter_klass_loaded())
2307 method_parameters_length = 0;
2308 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2309 if (method_attribute_length != 0) {
2310 classfile_parse_error(
2311 "Invalid Synthetic method attribute length %u in class file %s",
2312 method_attribute_length, CHECK_(nullHandle));
2313 }
2314 // Should we check that there hasn't already been a synthetic attribute?
2315 access_flags.set_is_synthetic();
2316 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2317 if (method_attribute_length != 0) {
2318 classfile_parse_error(
2319 "Invalid Deprecated method attribute length %u in class file %s",
2320 method_attribute_length, CHECK_(nullHandle));
2321 }
2322 } else if (_major_version >= JAVA_1_5_VERSION) {
2323 if (method_attribute_name == vmSymbols::tag_signature()) {
2324 if (method_attribute_length != 2) {
2325 classfile_parse_error(
2326 "Invalid Signature attribute length %u in class file %s",
2327 method_attribute_length, CHECK_(nullHandle));
2328 }
2329 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle));
2330 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2331 runtime_visible_annotations_length = method_attribute_length;
2332 runtime_visible_annotations = cfs->get_u1_buffer();
2333 assert(runtime_visible_annotations != NULL, "null visible annotations");
2334 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_(nullHandle));
2335 parse_annotations(runtime_visible_annotations,
2336 runtime_visible_annotations_length, &parsed_annotations,
2337 CHECK_(nullHandle));
2338 cfs->skip_u1_fast(runtime_visible_annotations_length);
2339 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2340 runtime_invisible_annotations_length = method_attribute_length;
2341 runtime_invisible_annotations = cfs->get_u1_buffer();
2342 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2343 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
2344 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2345 runtime_visible_parameter_annotations_length = method_attribute_length;
2346 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2347 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2348 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2349 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2350 runtime_invisible_parameter_annotations_length = method_attribute_length;
2351 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2352 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2353 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
2354 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2355 annotation_default_length = method_attribute_length;
2356 annotation_default = cfs->get_u1_buffer();
2357 assert(annotation_default != NULL, "null annotation default");
2358 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2359 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2360 if (runtime_visible_type_annotations != NULL) {
2361 classfile_parse_error(
2362 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2363 CHECK_(nullHandle));
2364 }
2365 runtime_visible_type_annotations_length = method_attribute_length;
2366 runtime_visible_type_annotations = cfs->get_u1_buffer();
2367 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2368 // No need for the VM to parse Type annotations
2369 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2370 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2371 if (runtime_invisible_type_annotations_exists) {
2372 classfile_parse_error(
2373 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2374 CHECK_(nullHandle));
2375 } else {
2376 runtime_invisible_type_annotations_exists = true;
2377 }
2378 if (PreserveAllAnnotations) {
2379 runtime_invisible_type_annotations_length = method_attribute_length;
2380 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2381 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2382 }
2383 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2384 } else {
2385 // Skip unknown attributes
2386 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2387 }
2388 } else {
2389 // Skip unknown attributes
2390 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2391 }
2392 }
2394 if (linenumber_table != NULL) {
2395 linenumber_table->write_terminator();
2396 linenumber_table_length = linenumber_table->position();
2397 }
2399 // Make sure there's at least one Code attribute in non-native/non-abstract method
2400 if (_need_verify) {
2401 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2402 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2403 }
2405 // All sizing information for a Method* is finally available, now create it
2406 InlineTableSizes sizes(
2407 total_lvt_length,
2408 linenumber_table_length,
2409 exception_table_length,
2410 checked_exceptions_length,
2411 method_parameters_length,
2412 generic_signature_index,
2413 runtime_visible_annotations_length +
2414 runtime_invisible_annotations_length,
2415 runtime_visible_parameter_annotations_length +
2416 runtime_invisible_parameter_annotations_length,
2417 runtime_visible_type_annotations_length +
2418 runtime_invisible_type_annotations_length,
2419 annotation_default_length,
2420 0);
2422 Method* m = Method::allocate(
2423 _loader_data, code_length, access_flags, &sizes,
2424 ConstMethod::NORMAL, CHECK_(nullHandle));
2426 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2428 // Fill in information from fixed part (access_flags already set)
2429 m->set_constants(_cp);
2430 m->set_name_index(name_index);
2431 m->set_signature_index(signature_index);
2433 ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2434 m->constMethod()->set_result_type(rtf.type());
2436 if (args_size >= 0) {
2437 m->set_size_of_parameters(args_size);
2438 } else {
2439 m->compute_size_of_parameters(THREAD);
2440 }
2441 #ifdef ASSERT
2442 if (args_size >= 0) {
2443 m->compute_size_of_parameters(THREAD);
2444 assert(args_size == m->size_of_parameters(), "");
2445 }
2446 #endif
2448 // Fill in code attribute information
2449 m->set_max_stack(max_stack);
2450 m->set_max_locals(max_locals);
2451 if (stackmap_data != NULL) {
2452 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2453 stackmap_data_length, CHECK_NULL);
2454 }
2456 // Copy byte codes
2457 m->set_code(code_start);
2459 // Copy line number table
2460 if (linenumber_table != NULL) {
2461 memcpy(m->compressed_linenumber_table(),
2462 linenumber_table->buffer(), linenumber_table_length);
2463 }
2465 // Copy exception table
2466 if (exception_table_length > 0) {
2467 int size =
2468 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2469 copy_u2_with_conversion((u2*) m->exception_table_start(),
2470 exception_table_start, size);
2471 }
2473 // Copy method parameters
2474 if (method_parameters_length > 0) {
2475 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2476 for (int i = 0; i < method_parameters_length; i++) {
2477 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2478 method_parameters_data += 2;
2479 elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2480 method_parameters_data += 2;
2481 }
2482 }
2484 // Copy checked exceptions
2485 if (checked_exceptions_length > 0) {
2486 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2487 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2488 }
2490 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2491 if (total_lvt_length > 0) {
2492 promoted_flags->set_has_localvariable_table();
2493 copy_localvariable_table(m->constMethod(), lvt_cnt,
2494 localvariable_table_length,
2495 localvariable_table_start,
2496 lvtt_cnt,
2497 localvariable_type_table_length,
2498 localvariable_type_table_start, CHECK_NULL);
2499 }
2501 if (parsed_annotations.has_any_annotations())
2502 parsed_annotations.apply_to(m);
2504 // Copy annotations
2505 copy_method_annotations(m->constMethod(),
2506 runtime_visible_annotations,
2507 runtime_visible_annotations_length,
2508 runtime_invisible_annotations,
2509 runtime_invisible_annotations_length,
2510 runtime_visible_parameter_annotations,
2511 runtime_visible_parameter_annotations_length,
2512 runtime_invisible_parameter_annotations,
2513 runtime_invisible_parameter_annotations_length,
2514 runtime_visible_type_annotations,
2515 runtime_visible_type_annotations_length,
2516 runtime_invisible_type_annotations,
2517 runtime_invisible_type_annotations_length,
2518 annotation_default,
2519 annotation_default_length,
2520 CHECK_NULL);
2522 if (name == vmSymbols::finalize_method_name() &&
2523 signature == vmSymbols::void_method_signature()) {
2524 if (m->is_empty_method()) {
2525 _has_empty_finalizer = true;
2526 } else {
2527 _has_finalizer = true;
2528 }
2529 }
2530 if (name == vmSymbols::object_initializer_name() &&
2531 signature == vmSymbols::void_method_signature() &&
2532 m->is_vanilla_constructor()) {
2533 _has_vanilla_constructor = true;
2534 }
2536 NOT_PRODUCT(m->verify());
2537 return m;
2538 }
2541 // The promoted_flags parameter is used to pass relevant access_flags
2542 // from the methods back up to the containing klass. These flag values
2543 // are added to klass's access_flags.
2545 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2546 AccessFlags* promoted_flags,
2547 bool* has_final_method,
2548 bool* declares_default_methods,
2549 TRAPS) {
2550 ClassFileStream* cfs = stream();
2551 cfs->guarantee_more(2, CHECK_NULL); // length
2552 u2 length = cfs->get_u2_fast();
2553 if (length == 0) {
2554 _methods = Universe::the_empty_method_array();
2555 } else {
2556 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2558 HandleMark hm(THREAD);
2559 for (int index = 0; index < length; index++) {
2560 methodHandle method = parse_method(is_interface,
2561 promoted_flags,
2562 CHECK_NULL);
2564 if (method->is_final()) {
2565 *has_final_method = true;
2566 }
2567 // declares_default_methods: declares concrete instance methods, any access flags
2568 // used for interface initialization, and default method inheritance analysis
2569 if (is_interface && !(*declares_default_methods)
2570 && !method->is_abstract() && !method->is_static()) {
2571 *declares_default_methods = true;
2572 }
2573 _methods->at_put(index, method());
2574 }
2576 if (_need_verify && length > 1) {
2577 // Check duplicated methods
2578 ResourceMark rm(THREAD);
2579 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2580 THREAD, NameSigHash*, HASH_ROW_SIZE);
2581 initialize_hashtable(names_and_sigs);
2582 bool dup = false;
2583 {
2584 debug_only(No_Safepoint_Verifier nsv;)
2585 for (int i = 0; i < length; i++) {
2586 Method* m = _methods->at(i);
2587 // If no duplicates, add name/signature in hashtable names_and_sigs.
2588 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2589 dup = true;
2590 break;
2591 }
2592 }
2593 }
2594 if (dup) {
2595 classfile_parse_error("Duplicate method name&signature in class file %s",
2596 CHECK_NULL);
2597 }
2598 }
2599 }
2600 return _methods;
2601 }
2604 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2605 int length = methods->length();
2606 // If JVMTI original method ordering or sharing is enabled we have to
2607 // remember the original class file ordering.
2608 // We temporarily use the vtable_index field in the Method* to store the
2609 // class file index, so we can read in after calling qsort.
2610 // Put the method ordering in the shared archive.
2611 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2612 for (int index = 0; index < length; index++) {
2613 Method* m = methods->at(index);
2614 assert(!m->valid_vtable_index(), "vtable index should not be set");
2615 m->set_vtable_index(index);
2616 }
2617 }
2618 // Sort method array by ascending method name (for faster lookups & vtable construction)
2619 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2620 Method::sort_methods(methods);
2622 intArray* method_ordering = NULL;
2623 // If JVMTI original method ordering or sharing is enabled construct int
2624 // array remembering the original ordering
2625 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2626 method_ordering = new intArray(length);
2627 for (int index = 0; index < length; index++) {
2628 Method* m = methods->at(index);
2629 int old_index = m->vtable_index();
2630 assert(old_index >= 0 && old_index < length, "invalid method index");
2631 method_ordering->at_put(index, old_index);
2632 m->set_vtable_index(Method::invalid_vtable_index);
2633 }
2634 }
2635 return method_ordering;
2636 }
2638 // Parse generic_signature attribute for methods and fields
2639 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) {
2640 ClassFileStream* cfs = stream();
2641 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2642 u2 generic_signature_index = cfs->get_u2_fast();
2643 check_property(
2644 valid_symbol_at(generic_signature_index),
2645 "Invalid Signature attribute at constant pool index %u in class file %s",
2646 generic_signature_index, CHECK_0);
2647 return generic_signature_index;
2648 }
2650 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2651 ClassFileStream* cfs = stream();
2652 cfs->guarantee_more(2, CHECK); // sourcefile_index
2653 u2 sourcefile_index = cfs->get_u2_fast();
2654 check_property(
2655 valid_symbol_at(sourcefile_index),
2656 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2657 sourcefile_index, CHECK);
2658 set_class_sourcefile_index(sourcefile_index);
2659 }
2663 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2664 ClassFileStream* cfs = stream();
2665 u1* sde_buffer = cfs->get_u1_buffer();
2666 assert(sde_buffer != NULL, "null sde buffer");
2668 // Don't bother storing it if there is no way to retrieve it
2669 if (JvmtiExport::can_get_source_debug_extension()) {
2670 assert((length+1) > length, "Overflow checking");
2671 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2672 for (int i = 0; i < length; i++) {
2673 sde[i] = sde_buffer[i];
2674 }
2675 sde[length] = '\0';
2676 set_class_sde_buffer((char*)sde, length);
2677 }
2678 // Got utf8 string, set stream position forward
2679 cfs->skip_u1(length, CHECK);
2680 }
2683 // Inner classes can be static, private or protected (classic VM does this)
2684 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2686 // Return number of classes in the inner classes attribute table
2687 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2688 bool parsed_enclosingmethod_attribute,
2689 u2 enclosing_method_class_index,
2690 u2 enclosing_method_method_index,
2691 TRAPS) {
2692 ClassFileStream* cfs = stream();
2693 u1* current_mark = cfs->current();
2694 u2 length = 0;
2695 if (inner_classes_attribute_start != NULL) {
2696 cfs->set_current(inner_classes_attribute_start);
2697 cfs->guarantee_more(2, CHECK_0); // length
2698 length = cfs->get_u2_fast();
2699 }
2701 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2702 // method data:
2703 // [inner_class_info_index,
2704 // outer_class_info_index,
2705 // inner_name_index,
2706 // inner_class_access_flags,
2707 // ...
2708 // enclosing_method_class_index,
2709 // enclosing_method_method_index]
2710 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2711 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2712 _inner_classes = inner_classes;
2714 int index = 0;
2715 int cp_size = _cp->length();
2716 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2717 for (int n = 0; n < length; n++) {
2718 // Inner class index
2719 u2 inner_class_info_index = cfs->get_u2_fast();
2720 check_property(
2721 inner_class_info_index == 0 ||
2722 valid_klass_reference_at(inner_class_info_index),
2723 "inner_class_info_index %u has bad constant type in class file %s",
2724 inner_class_info_index, CHECK_0);
2725 // Outer class index
2726 u2 outer_class_info_index = cfs->get_u2_fast();
2727 check_property(
2728 outer_class_info_index == 0 ||
2729 valid_klass_reference_at(outer_class_info_index),
2730 "outer_class_info_index %u has bad constant type in class file %s",
2731 outer_class_info_index, CHECK_0);
2732 // Inner class name
2733 u2 inner_name_index = cfs->get_u2_fast();
2734 check_property(
2735 inner_name_index == 0 || valid_symbol_at(inner_name_index),
2736 "inner_name_index %u has bad constant type in class file %s",
2737 inner_name_index, CHECK_0);
2738 if (_need_verify) {
2739 guarantee_property(inner_class_info_index != outer_class_info_index,
2740 "Class is both outer and inner class in class file %s", CHECK_0);
2741 }
2742 // Access flags
2743 AccessFlags inner_access_flags;
2744 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2745 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2746 // Set abstract bit for old class files for backward compatibility
2747 flags |= JVM_ACC_ABSTRACT;
2748 }
2749 verify_legal_class_modifiers(flags, CHECK_0);
2750 inner_access_flags.set_flags(flags);
2752 inner_classes->at_put(index++, inner_class_info_index);
2753 inner_classes->at_put(index++, outer_class_info_index);
2754 inner_classes->at_put(index++, inner_name_index);
2755 inner_classes->at_put(index++, inner_access_flags.as_short());
2756 }
2758 // 4347400: make sure there's no duplicate entry in the classes array
2759 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2760 for(int i = 0; i < length * 4; i += 4) {
2761 for(int j = i + 4; j < length * 4; j += 4) {
2762 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2763 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2764 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2765 inner_classes->at(i+3) != inner_classes->at(j+3)),
2766 "Duplicate entry in InnerClasses in class file %s",
2767 CHECK_0);
2768 }
2769 }
2770 }
2772 // Set EnclosingMethod class and method indexes.
2773 if (parsed_enclosingmethod_attribute) {
2774 inner_classes->at_put(index++, enclosing_method_class_index);
2775 inner_classes->at_put(index++, enclosing_method_method_index);
2776 }
2777 assert(index == size, "wrong size");
2779 // Restore buffer's current position.
2780 cfs->set_current(current_mark);
2782 return length;
2783 }
2785 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2786 set_class_synthetic_flag(true);
2787 }
2789 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2790 ClassFileStream* cfs = stream();
2791 u2 signature_index = cfs->get_u2(CHECK);
2792 check_property(
2793 valid_symbol_at(signature_index),
2794 "Invalid constant pool index %u in Signature attribute in class file %s",
2795 signature_index, CHECK);
2796 set_class_generic_signature_index(signature_index);
2797 }
2799 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2800 ClassFileStream* cfs = stream();
2801 u1* current_start = cfs->current();
2803 guarantee_property(attribute_byte_length >= sizeof(u2),
2804 "Invalid BootstrapMethods attribute length %u in class file %s",
2805 attribute_byte_length,
2806 CHECK);
2808 cfs->guarantee_more(attribute_byte_length, CHECK);
2810 int attribute_array_length = cfs->get_u2_fast();
2812 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2813 "Short length on BootstrapMethods in class file %s",
2814 CHECK);
2816 // The attribute contains a counted array of counted tuples of shorts,
2817 // represending bootstrap specifiers:
2818 // length*{bootstrap_method_index, argument_count*{argument_index}}
2819 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2820 // operand_count = number of shorts in attr, except for leading length
2822 // The attribute is copied into a short[] array.
2823 // The array begins with a series of short[2] pairs, one for each tuple.
2824 int index_size = (attribute_array_length * 2);
2826 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2828 // Eagerly assign operands so they will be deallocated with the constant
2829 // pool if there is an error.
2830 _cp->set_operands(operands);
2832 int operand_fill_index = index_size;
2833 int cp_size = _cp->length();
2835 for (int n = 0; n < attribute_array_length; n++) {
2836 // Store a 32-bit offset into the header of the operand array.
2837 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2839 // Read a bootstrap specifier.
2840 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2841 u2 bootstrap_method_index = cfs->get_u2_fast();
2842 u2 argument_count = cfs->get_u2_fast();
2843 check_property(
2844 valid_cp_range(bootstrap_method_index, cp_size) &&
2845 _cp->tag_at(bootstrap_method_index).is_method_handle(),
2846 "bootstrap_method_index %u has bad constant type in class file %s",
2847 bootstrap_method_index,
2848 CHECK);
2850 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
2851 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
2852 CHECK);
2854 operands->at_put(operand_fill_index++, bootstrap_method_index);
2855 operands->at_put(operand_fill_index++, argument_count);
2857 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2858 for (int j = 0; j < argument_count; j++) {
2859 u2 argument_index = cfs->get_u2_fast();
2860 check_property(
2861 valid_cp_range(argument_index, cp_size) &&
2862 _cp->tag_at(argument_index).is_loadable_constant(),
2863 "argument_index %u has bad constant type in class file %s",
2864 argument_index,
2865 CHECK);
2866 operands->at_put(operand_fill_index++, argument_index);
2867 }
2868 }
2870 assert(operand_fill_index == operands->length(), "exact fill");
2872 u1* current_end = cfs->current();
2873 guarantee_property(current_end == current_start + attribute_byte_length,
2874 "Bad length on BootstrapMethods in class file %s",
2875 CHECK);
2876 }
2878 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2879 TRAPS) {
2880 ClassFileStream* cfs = stream();
2881 // Set inner classes attribute to default sentinel
2882 _inner_classes = Universe::the_empty_short_array();
2883 cfs->guarantee_more(2, CHECK); // attributes_count
2884 u2 attributes_count = cfs->get_u2_fast();
2885 bool parsed_sourcefile_attribute = false;
2886 bool parsed_innerclasses_attribute = false;
2887 bool parsed_enclosingmethod_attribute = false;
2888 bool parsed_bootstrap_methods_attribute = false;
2889 u1* runtime_visible_annotations = NULL;
2890 int runtime_visible_annotations_length = 0;
2891 u1* runtime_invisible_annotations = NULL;
2892 int runtime_invisible_annotations_length = 0;
2893 u1* runtime_visible_type_annotations = NULL;
2894 int runtime_visible_type_annotations_length = 0;
2895 u1* runtime_invisible_type_annotations = NULL;
2896 int runtime_invisible_type_annotations_length = 0;
2897 bool runtime_invisible_type_annotations_exists = false;
2898 u1* inner_classes_attribute_start = NULL;
2899 u4 inner_classes_attribute_length = 0;
2900 u2 enclosing_method_class_index = 0;
2901 u2 enclosing_method_method_index = 0;
2902 // Iterate over attributes
2903 while (attributes_count--) {
2904 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2905 u2 attribute_name_index = cfs->get_u2_fast();
2906 u4 attribute_length = cfs->get_u4_fast();
2907 check_property(
2908 valid_symbol_at(attribute_name_index),
2909 "Attribute name has bad constant pool index %u in class file %s",
2910 attribute_name_index, CHECK);
2911 Symbol* tag = _cp->symbol_at(attribute_name_index);
2912 if (tag == vmSymbols::tag_source_file()) {
2913 // Check for SourceFile tag
2914 if (_need_verify) {
2915 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2916 }
2917 if (parsed_sourcefile_attribute) {
2918 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2919 } else {
2920 parsed_sourcefile_attribute = true;
2921 }
2922 parse_classfile_sourcefile_attribute(CHECK);
2923 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2924 // Check for SourceDebugExtension tag
2925 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2926 } else if (tag == vmSymbols::tag_inner_classes()) {
2927 // Check for InnerClasses tag
2928 if (parsed_innerclasses_attribute) {
2929 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2930 } else {
2931 parsed_innerclasses_attribute = true;
2932 }
2933 inner_classes_attribute_start = cfs->get_u1_buffer();
2934 inner_classes_attribute_length = attribute_length;
2935 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2936 } else if (tag == vmSymbols::tag_synthetic()) {
2937 // Check for Synthetic tag
2938 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2939 if (attribute_length != 0) {
2940 classfile_parse_error(
2941 "Invalid Synthetic classfile attribute length %u in class file %s",
2942 attribute_length, CHECK);
2943 }
2944 parse_classfile_synthetic_attribute(CHECK);
2945 } else if (tag == vmSymbols::tag_deprecated()) {
2946 // Check for Deprecatd tag - 4276120
2947 if (attribute_length != 0) {
2948 classfile_parse_error(
2949 "Invalid Deprecated classfile attribute length %u in class file %s",
2950 attribute_length, CHECK);
2951 }
2952 } else if (_major_version >= JAVA_1_5_VERSION) {
2953 if (tag == vmSymbols::tag_signature()) {
2954 if (attribute_length != 2) {
2955 classfile_parse_error(
2956 "Wrong Signature attribute length %u in class file %s",
2957 attribute_length, CHECK);
2958 }
2959 parse_classfile_signature_attribute(CHECK);
2960 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2961 runtime_visible_annotations_length = attribute_length;
2962 runtime_visible_annotations = cfs->get_u1_buffer();
2963 assert(runtime_visible_annotations != NULL, "null visible annotations");
2964 cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
2965 parse_annotations(runtime_visible_annotations,
2966 runtime_visible_annotations_length,
2967 parsed_annotations,
2968 CHECK);
2969 cfs->skip_u1_fast(runtime_visible_annotations_length);
2970 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2971 runtime_invisible_annotations_length = attribute_length;
2972 runtime_invisible_annotations = cfs->get_u1_buffer();
2973 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2974 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2975 } else if (tag == vmSymbols::tag_enclosing_method()) {
2976 if (parsed_enclosingmethod_attribute) {
2977 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2978 } else {
2979 parsed_enclosingmethod_attribute = true;
2980 }
2981 cfs->guarantee_more(4, CHECK); // class_index, method_index
2982 enclosing_method_class_index = cfs->get_u2_fast();
2983 enclosing_method_method_index = cfs->get_u2_fast();
2984 if (enclosing_method_class_index == 0) {
2985 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2986 }
2987 // Validate the constant pool indices and types
2988 check_property(valid_klass_reference_at(enclosing_method_class_index),
2989 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2990 if (enclosing_method_method_index != 0 &&
2991 (!_cp->is_within_bounds(enclosing_method_method_index) ||
2992 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2993 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2994 }
2995 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2996 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2997 if (parsed_bootstrap_methods_attribute)
2998 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2999 parsed_bootstrap_methods_attribute = true;
3000 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
3001 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3002 if (runtime_visible_type_annotations != NULL) {
3003 classfile_parse_error(
3004 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3005 }
3006 runtime_visible_type_annotations_length = attribute_length;
3007 runtime_visible_type_annotations = cfs->get_u1_buffer();
3008 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3009 // No need for the VM to parse Type annotations
3010 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3011 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3012 if (runtime_invisible_type_annotations_exists) {
3013 classfile_parse_error(
3014 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3015 } else {
3016 runtime_invisible_type_annotations_exists = true;
3017 }
3018 if (PreserveAllAnnotations) {
3019 runtime_invisible_type_annotations_length = attribute_length;
3020 runtime_invisible_type_annotations = cfs->get_u1_buffer();
3021 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3022 }
3023 cfs->skip_u1(attribute_length, CHECK);
3024 } else {
3025 // Unknown attribute
3026 cfs->skip_u1(attribute_length, CHECK);
3027 }
3028 } else {
3029 // Unknown attribute
3030 cfs->skip_u1(attribute_length, CHECK);
3031 }
3032 }
3033 _annotations = assemble_annotations(runtime_visible_annotations,
3034 runtime_visible_annotations_length,
3035 runtime_invisible_annotations,
3036 runtime_invisible_annotations_length,
3037 CHECK);
3038 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3039 runtime_visible_type_annotations_length,
3040 runtime_invisible_type_annotations,
3041 runtime_invisible_type_annotations_length,
3042 CHECK);
3044 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3045 u2 num_of_classes = parse_classfile_inner_classes_attribute(
3046 inner_classes_attribute_start,
3047 parsed_innerclasses_attribute,
3048 enclosing_method_class_index,
3049 enclosing_method_method_index,
3050 CHECK);
3051 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3052 guarantee_property(
3053 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3054 "Wrong InnerClasses attribute length in class file %s", CHECK);
3055 }
3056 }
3058 if (_max_bootstrap_specifier_index >= 0) {
3059 guarantee_property(parsed_bootstrap_methods_attribute,
3060 "Missing BootstrapMethods attribute in class file %s", CHECK);
3061 }
3062 }
3064 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
3065 if (_synthetic_flag)
3066 k->set_is_synthetic();
3067 if (_sourcefile_index != 0) {
3068 k->set_source_file_name_index(_sourcefile_index);
3069 }
3070 if (_generic_signature_index != 0) {
3071 k->set_generic_signature_index(_generic_signature_index);
3072 }
3073 if (_sde_buffer != NULL) {
3074 k->set_source_debug_extension(_sde_buffer, _sde_length);
3075 }
3076 }
3078 // Create the Annotations object that will
3079 // hold the annotations array for the Klass.
3080 void ClassFileParser::create_combined_annotations(TRAPS) {
3081 if (_annotations == NULL &&
3082 _type_annotations == NULL &&
3083 _fields_annotations == NULL &&
3084 _fields_type_annotations == NULL) {
3085 // Don't create the Annotations object unnecessarily.
3086 return;
3087 }
3089 Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3090 annotations->set_class_annotations(_annotations);
3091 annotations->set_class_type_annotations(_type_annotations);
3092 annotations->set_fields_annotations(_fields_annotations);
3093 annotations->set_fields_type_annotations(_fields_type_annotations);
3095 // This is the Annotations object that will be
3096 // assigned to InstanceKlass being constructed.
3097 _combined_annotations = annotations;
3099 // The annotations arrays below has been transfered the
3100 // _combined_annotations so these fields can now be cleared.
3101 _annotations = NULL;
3102 _type_annotations = NULL;
3103 _fields_annotations = NULL;
3104 _fields_type_annotations = NULL;
3105 }
3107 // Transfer ownership of metadata allocated to the InstanceKlass.
3108 void ClassFileParser::apply_parsed_class_metadata(
3109 instanceKlassHandle this_klass,
3110 int java_fields_count, TRAPS) {
3111 _cp->set_pool_holder(this_klass());
3112 this_klass->set_constants(_cp);
3113 this_klass->set_fields(_fields, java_fields_count);
3114 this_klass->set_methods(_methods);
3115 this_klass->set_inner_classes(_inner_classes);
3116 this_klass->set_local_interfaces(_local_interfaces);
3117 this_klass->set_transitive_interfaces(_transitive_interfaces);
3118 this_klass->set_annotations(_combined_annotations);
3120 // Clear out these fields so they don't get deallocated by the destructor
3121 clear_class_metadata();
3122 }
3124 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3125 int runtime_visible_annotations_length,
3126 u1* runtime_invisible_annotations,
3127 int runtime_invisible_annotations_length, TRAPS) {
3128 AnnotationArray* annotations = NULL;
3129 if (runtime_visible_annotations != NULL ||
3130 runtime_invisible_annotations != NULL) {
3131 annotations = MetadataFactory::new_array<u1>(_loader_data,
3132 runtime_visible_annotations_length +
3133 runtime_invisible_annotations_length,
3134 CHECK_(annotations));
3135 if (runtime_visible_annotations != NULL) {
3136 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3137 annotations->at_put(i, runtime_visible_annotations[i]);
3138 }
3139 }
3140 if (runtime_invisible_annotations != NULL) {
3141 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3142 int append = runtime_visible_annotations_length+i;
3143 annotations->at_put(append, runtime_invisible_annotations[i]);
3144 }
3145 }
3146 }
3147 return annotations;
3148 }
3150 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3151 TRAPS) {
3152 instanceKlassHandle super_klass;
3153 if (super_class_index == 0) {
3154 check_property(_class_name == vmSymbols::java_lang_Object(),
3155 "Invalid superclass index %u in class file %s",
3156 super_class_index,
3157 CHECK_NULL);
3158 } else {
3159 check_property(valid_klass_reference_at(super_class_index),
3160 "Invalid superclass index %u in class file %s",
3161 super_class_index,
3162 CHECK_NULL);
3163 // The class name should be legal because it is checked when parsing constant pool.
3164 // However, make sure it is not an array type.
3165 bool is_array = false;
3166 if (_cp->tag_at(super_class_index).is_klass()) {
3167 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3168 if (_need_verify)
3169 is_array = super_klass->oop_is_array();
3170 } else if (_need_verify) {
3171 is_array = (_cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3172 }
3173 if (_need_verify) {
3174 guarantee_property(!is_array,
3175 "Bad superclass name in class file %s", CHECK_NULL);
3176 }
3177 }
3178 return super_klass;
3179 }
3182 // Values needed for oopmap and InstanceKlass creation
3183 class FieldLayoutInfo : public StackObj {
3184 public:
3185 int* nonstatic_oop_offsets;
3186 unsigned int* nonstatic_oop_counts;
3187 unsigned int nonstatic_oop_map_count;
3188 unsigned int total_oop_map_count;
3189 int instance_size;
3190 int nonstatic_field_size;
3191 int static_field_size;
3192 bool has_nonstatic_fields;
3193 };
3195 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3196 void ClassFileParser::layout_fields(Handle class_loader,
3197 FieldAllocationCount* fac,
3198 ClassAnnotationCollector* parsed_annotations,
3199 FieldLayoutInfo* info,
3200 TRAPS) {
3202 // Field size and offset computation
3203 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3204 int next_static_oop_offset = 0;
3205 int next_static_double_offset = 0;
3206 int next_static_word_offset = 0;
3207 int next_static_short_offset = 0;
3208 int next_static_byte_offset = 0;
3209 int next_nonstatic_oop_offset = 0;
3210 int next_nonstatic_double_offset = 0;
3211 int next_nonstatic_word_offset = 0;
3212 int next_nonstatic_short_offset = 0;
3213 int next_nonstatic_byte_offset = 0;
3214 int first_nonstatic_oop_offset = 0;
3215 int next_nonstatic_field_offset = 0;
3216 int next_nonstatic_padded_offset = 0;
3218 // Count the contended fields by type.
3219 //
3220 // We ignore static fields, because @Contended is not supported for them.
3221 // The layout code below will also ignore the static fields.
3222 int nonstatic_contended_count = 0;
3223 FieldAllocationCount fac_contended;
3224 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3225 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3226 if (fs.is_contended()) {
3227 fac_contended.count[atype]++;
3228 if (!fs.access_flags().is_static()) {
3229 nonstatic_contended_count++;
3230 }
3231 }
3232 }
3235 // Calculate the starting byte offsets
3236 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3237 next_static_double_offset = next_static_oop_offset +
3238 ((fac->count[STATIC_OOP]) * heapOopSize);
3239 if ( fac->count[STATIC_DOUBLE] &&
3240 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3241 Universe::field_type_should_be_aligned(T_LONG)) ) {
3242 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3243 }
3245 next_static_word_offset = next_static_double_offset +
3246 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3247 next_static_short_offset = next_static_word_offset +
3248 ((fac->count[STATIC_WORD]) * BytesPerInt);
3249 next_static_byte_offset = next_static_short_offset +
3250 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3252 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3253 nonstatic_field_size * heapOopSize;
3255 next_nonstatic_field_offset = nonstatic_fields_start;
3257 bool is_contended_class = parsed_annotations->is_contended();
3259 // Class is contended, pad before all the fields
3260 if (is_contended_class) {
3261 next_nonstatic_field_offset += ContendedPaddingWidth;
3262 }
3264 // Compute the non-contended fields count.
3265 // The packing code below relies on these counts to determine if some field
3266 // can be squeezed into the alignment gap. Contended fields are obviously
3267 // exempt from that.
3268 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3269 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3270 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3271 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3272 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3274 // Total non-static fields count, including every contended field
3275 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3276 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3277 fac->count[NONSTATIC_OOP];
3279 bool super_has_nonstatic_fields =
3280 (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3281 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3284 // Prepare list of oops for oop map generation.
3285 //
3286 // "offset" and "count" lists are describing the set of contiguous oop
3287 // regions. offset[i] is the start of the i-th region, which then has
3288 // count[i] oops following. Before we know how many regions are required,
3289 // we pessimistically allocate the maps to fit all the oops into the
3290 // distinct regions.
3291 //
3292 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3293 // to figure out if we still need to do this.
3294 int* nonstatic_oop_offsets;
3295 unsigned int* nonstatic_oop_counts;
3296 unsigned int nonstatic_oop_map_count = 0;
3297 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3299 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3300 THREAD, int, max_nonstatic_oop_maps);
3301 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3302 THREAD, unsigned int, max_nonstatic_oop_maps);
3304 first_nonstatic_oop_offset = 0; // will be set for first oop field
3306 bool compact_fields = CompactFields;
3307 int allocation_style = FieldsAllocationStyle;
3308 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3309 assert(false, "0 <= FieldsAllocationStyle <= 2");
3310 allocation_style = 1; // Optimistic
3311 }
3313 // The next classes have predefined hard-coded fields offsets
3314 // (see in JavaClasses::compute_hard_coded_offsets()).
3315 // Use default fields allocation order for them.
3316 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3317 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3318 _class_name == vmSymbols::java_lang_Class() ||
3319 _class_name == vmSymbols::java_lang_ClassLoader() ||
3320 _class_name == vmSymbols::java_lang_ref_Reference() ||
3321 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3322 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3323 _class_name == vmSymbols::java_lang_String() ||
3324 _class_name == vmSymbols::java_lang_Throwable() ||
3325 _class_name == vmSymbols::java_lang_Boolean() ||
3326 _class_name == vmSymbols::java_lang_Character() ||
3327 _class_name == vmSymbols::java_lang_Float() ||
3328 _class_name == vmSymbols::java_lang_Double() ||
3329 _class_name == vmSymbols::java_lang_Byte() ||
3330 _class_name == vmSymbols::java_lang_Short() ||
3331 _class_name == vmSymbols::java_lang_Integer() ||
3332 _class_name == vmSymbols::java_lang_Long())) {
3333 allocation_style = 0; // Allocate oops first
3334 compact_fields = false; // Don't compact fields
3335 }
3337 // Rearrange fields for a given allocation style
3338 if( allocation_style == 0 ) {
3339 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3340 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3341 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3342 (nonstatic_oop_count * heapOopSize);
3343 } else if( allocation_style == 1 ) {
3344 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3345 next_nonstatic_double_offset = next_nonstatic_field_offset;
3346 } else if( allocation_style == 2 ) {
3347 // Fields allocation: oops fields in super and sub classes are together.
3348 if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3349 _super_klass->nonstatic_oop_map_size() > 0 ) {
3350 unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3351 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3352 OopMapBlock* last_map = first_map + map_count - 1;
3353 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3354 if (next_offset == next_nonstatic_field_offset) {
3355 allocation_style = 0; // allocate oops first
3356 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3357 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3358 (nonstatic_oop_count * heapOopSize);
3359 }
3360 }
3361 if( allocation_style == 2 ) {
3362 allocation_style = 1; // allocate oops last
3363 next_nonstatic_double_offset = next_nonstatic_field_offset;
3364 }
3365 } else {
3366 ShouldNotReachHere();
3367 }
3369 int nonstatic_oop_space_count = 0;
3370 int nonstatic_word_space_count = 0;
3371 int nonstatic_short_space_count = 0;
3372 int nonstatic_byte_space_count = 0;
3373 int nonstatic_oop_space_offset = 0;
3374 int nonstatic_word_space_offset = 0;
3375 int nonstatic_short_space_offset = 0;
3376 int nonstatic_byte_space_offset = 0;
3378 // Try to squeeze some of the fields into the gaps due to
3379 // long/double alignment.
3380 if( nonstatic_double_count > 0 ) {
3381 int offset = next_nonstatic_double_offset;
3382 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3383 if( compact_fields && offset != next_nonstatic_double_offset ) {
3384 // Allocate available fields into the gap before double field.
3385 int length = next_nonstatic_double_offset - offset;
3386 assert(length == BytesPerInt, "");
3387 nonstatic_word_space_offset = offset;
3388 if( nonstatic_word_count > 0 ) {
3389 nonstatic_word_count -= 1;
3390 nonstatic_word_space_count = 1; // Only one will fit
3391 length -= BytesPerInt;
3392 offset += BytesPerInt;
3393 }
3394 nonstatic_short_space_offset = offset;
3395 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3396 nonstatic_short_count -= 1;
3397 nonstatic_short_space_count += 1;
3398 length -= BytesPerShort;
3399 offset += BytesPerShort;
3400 }
3401 nonstatic_byte_space_offset = offset;
3402 while( length > 0 && nonstatic_byte_count > 0 ) {
3403 nonstatic_byte_count -= 1;
3404 nonstatic_byte_space_count += 1;
3405 length -= 1;
3406 }
3407 // Allocate oop field in the gap if there are no other fields for that.
3408 nonstatic_oop_space_offset = offset;
3409 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3410 allocation_style != 0 ) { // when oop fields not first
3411 nonstatic_oop_count -= 1;
3412 nonstatic_oop_space_count = 1; // Only one will fit
3413 length -= heapOopSize;
3414 offset += heapOopSize;
3415 }
3416 }
3417 }
3419 next_nonstatic_word_offset = next_nonstatic_double_offset +
3420 (nonstatic_double_count * BytesPerLong);
3421 next_nonstatic_short_offset = next_nonstatic_word_offset +
3422 (nonstatic_word_count * BytesPerInt);
3423 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3424 (nonstatic_short_count * BytesPerShort);
3425 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3426 nonstatic_byte_count;
3428 // let oops jump before padding with this allocation style
3429 if( allocation_style == 1 ) {
3430 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3431 if( nonstatic_oop_count > 0 ) {
3432 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3433 }
3434 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3435 }
3437 // Iterate over fields again and compute correct offsets.
3438 // The field allocation type was temporarily stored in the offset slot.
3439 // oop fields are located before non-oop fields (static and non-static).
3440 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3442 // skip already laid out fields
3443 if (fs.is_offset_set()) continue;
3445 // contended instance fields are handled below
3446 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3448 int real_offset = 0;
3449 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3451 // pack the rest of the fields
3452 switch (atype) {
3453 case STATIC_OOP:
3454 real_offset = next_static_oop_offset;
3455 next_static_oop_offset += heapOopSize;
3456 break;
3457 case STATIC_BYTE:
3458 real_offset = next_static_byte_offset;
3459 next_static_byte_offset += 1;
3460 break;
3461 case STATIC_SHORT:
3462 real_offset = next_static_short_offset;
3463 next_static_short_offset += BytesPerShort;
3464 break;
3465 case STATIC_WORD:
3466 real_offset = next_static_word_offset;
3467 next_static_word_offset += BytesPerInt;
3468 break;
3469 case STATIC_DOUBLE:
3470 real_offset = next_static_double_offset;
3471 next_static_double_offset += BytesPerLong;
3472 break;
3473 case NONSTATIC_OOP:
3474 if( nonstatic_oop_space_count > 0 ) {
3475 real_offset = nonstatic_oop_space_offset;
3476 nonstatic_oop_space_offset += heapOopSize;
3477 nonstatic_oop_space_count -= 1;
3478 } else {
3479 real_offset = next_nonstatic_oop_offset;
3480 next_nonstatic_oop_offset += heapOopSize;
3481 }
3482 // Update oop maps
3483 if( nonstatic_oop_map_count > 0 &&
3484 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3485 real_offset -
3486 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3487 heapOopSize ) {
3488 // Extend current oop map
3489 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3490 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3491 } else {
3492 // Create new oop map
3493 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3494 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3495 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3496 nonstatic_oop_map_count += 1;
3497 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3498 first_nonstatic_oop_offset = real_offset;
3499 }
3500 }
3501 break;
3502 case NONSTATIC_BYTE:
3503 if( nonstatic_byte_space_count > 0 ) {
3504 real_offset = nonstatic_byte_space_offset;
3505 nonstatic_byte_space_offset += 1;
3506 nonstatic_byte_space_count -= 1;
3507 } else {
3508 real_offset = next_nonstatic_byte_offset;
3509 next_nonstatic_byte_offset += 1;
3510 }
3511 break;
3512 case NONSTATIC_SHORT:
3513 if( nonstatic_short_space_count > 0 ) {
3514 real_offset = nonstatic_short_space_offset;
3515 nonstatic_short_space_offset += BytesPerShort;
3516 nonstatic_short_space_count -= 1;
3517 } else {
3518 real_offset = next_nonstatic_short_offset;
3519 next_nonstatic_short_offset += BytesPerShort;
3520 }
3521 break;
3522 case NONSTATIC_WORD:
3523 if( nonstatic_word_space_count > 0 ) {
3524 real_offset = nonstatic_word_space_offset;
3525 nonstatic_word_space_offset += BytesPerInt;
3526 nonstatic_word_space_count -= 1;
3527 } else {
3528 real_offset = next_nonstatic_word_offset;
3529 next_nonstatic_word_offset += BytesPerInt;
3530 }
3531 break;
3532 case NONSTATIC_DOUBLE:
3533 real_offset = next_nonstatic_double_offset;
3534 next_nonstatic_double_offset += BytesPerLong;
3535 break;
3536 default:
3537 ShouldNotReachHere();
3538 }
3539 fs.set_offset(real_offset);
3540 }
3543 // Handle the contended cases.
3544 //
3545 // Each contended field should not intersect the cache line with another contended field.
3546 // In the absence of alignment information, we end up with pessimistically separating
3547 // the fields with full-width padding.
3548 //
3549 // Additionally, this should not break alignment for the fields, so we round the alignment up
3550 // for each field.
3551 if (nonstatic_contended_count > 0) {
3553 // if there is at least one contended field, we need to have pre-padding for them
3554 next_nonstatic_padded_offset += ContendedPaddingWidth;
3556 // collect all contended groups
3557 BitMap bm(_cp->size());
3558 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3559 // skip already laid out fields
3560 if (fs.is_offset_set()) continue;
3562 if (fs.is_contended()) {
3563 bm.set_bit(fs.contended_group());
3564 }
3565 }
3567 int current_group = -1;
3568 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3570 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3572 // skip already laid out fields
3573 if (fs.is_offset_set()) continue;
3575 // skip non-contended fields and fields from different group
3576 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3578 // handle statics below
3579 if (fs.access_flags().is_static()) continue;
3581 int real_offset = 0;
3582 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3584 switch (atype) {
3585 case NONSTATIC_BYTE:
3586 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3587 real_offset = next_nonstatic_padded_offset;
3588 next_nonstatic_padded_offset += 1;
3589 break;
3591 case NONSTATIC_SHORT:
3592 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3593 real_offset = next_nonstatic_padded_offset;
3594 next_nonstatic_padded_offset += BytesPerShort;
3595 break;
3597 case NONSTATIC_WORD:
3598 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3599 real_offset = next_nonstatic_padded_offset;
3600 next_nonstatic_padded_offset += BytesPerInt;
3601 break;
3603 case NONSTATIC_DOUBLE:
3604 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3605 real_offset = next_nonstatic_padded_offset;
3606 next_nonstatic_padded_offset += BytesPerLong;
3607 break;
3609 case NONSTATIC_OOP:
3610 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3611 real_offset = next_nonstatic_padded_offset;
3612 next_nonstatic_padded_offset += heapOopSize;
3614 // Create new oop map
3615 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3616 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3617 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3618 nonstatic_oop_map_count += 1;
3619 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3620 first_nonstatic_oop_offset = real_offset;
3621 }
3622 break;
3624 default:
3625 ShouldNotReachHere();
3626 }
3628 if (fs.contended_group() == 0) {
3629 // Contended group defines the equivalence class over the fields:
3630 // the fields within the same contended group are not inter-padded.
3631 // The only exception is default group, which does not incur the
3632 // equivalence, and so requires intra-padding.
3633 next_nonstatic_padded_offset += ContendedPaddingWidth;
3634 }
3636 fs.set_offset(real_offset);
3637 } // for
3639 // Start laying out the next group.
3640 // Note that this will effectively pad the last group in the back;
3641 // this is expected to alleviate memory contention effects for
3642 // subclass fields and/or adjacent object.
3643 // If this was the default group, the padding is already in place.
3644 if (current_group != 0) {
3645 next_nonstatic_padded_offset += ContendedPaddingWidth;
3646 }
3647 }
3649 // handle static fields
3650 }
3652 // Entire class is contended, pad in the back.
3653 // This helps to alleviate memory contention effects for subclass fields
3654 // and/or adjacent object.
3655 if (is_contended_class) {
3656 next_nonstatic_padded_offset += ContendedPaddingWidth;
3657 }
3659 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
3661 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
3662 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize);
3663 int static_fields_end = align_size_up(next_static_byte_offset, wordSize);
3665 int static_field_size = (static_fields_end -
3666 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3667 nonstatic_field_size = nonstatic_field_size +
3668 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
3670 int instance_size = align_object_size(instance_end / wordSize);
3672 assert(instance_size == align_object_size(align_size_up(
3673 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
3674 wordSize) / wordSize), "consistent layout helper value");
3676 // Invariant: nonstatic_field end/start should only change if there are
3677 // nonstatic fields in the class, or if the class is contended. We compare
3678 // against the non-aligned value, so that end alignment will not fail the
3679 // assert without actually having the fields.
3680 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
3681 is_contended_class ||
3682 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
3684 // Number of non-static oop map blocks allocated at end of klass.
3685 const unsigned int total_oop_map_count =
3686 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3687 first_nonstatic_oop_offset);
3689 #ifndef PRODUCT
3690 if (PrintFieldLayout) {
3691 print_field_layout(_class_name,
3692 _fields,
3693 _cp,
3694 instance_size,
3695 nonstatic_fields_start,
3696 nonstatic_fields_end,
3697 static_fields_end);
3698 }
3700 #endif
3701 // Pass back information needed for InstanceKlass creation
3702 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3703 info->nonstatic_oop_counts = nonstatic_oop_counts;
3704 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3705 info->total_oop_map_count = total_oop_map_count;
3706 info->instance_size = instance_size;
3707 info->static_field_size = static_field_size;
3708 info->nonstatic_field_size = nonstatic_field_size;
3709 info->has_nonstatic_fields = has_nonstatic_fields;
3710 }
3713 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3714 ClassLoaderData* loader_data,
3715 Handle protection_domain,
3716 KlassHandle host_klass,
3717 GrowableArray<Handle>* cp_patches,
3718 TempNewSymbol& parsed_name,
3719 bool verify,
3720 TRAPS) {
3722 // When a retransformable agent is attached, JVMTI caches the
3723 // class bytes that existed before the first retransformation.
3724 // If RedefineClasses() was used before the retransformable
3725 // agent attached, then the cached class bytes may not be the
3726 // original class bytes.
3727 JvmtiCachedClassFileData *cached_class_file = NULL;
3728 Handle class_loader(THREAD, loader_data->class_loader());
3729 bool has_default_methods = false;
3730 bool declares_default_methods = false;
3731 ResourceMark rm(THREAD);
3733 ClassFileStream* cfs = stream();
3734 // Timing
3735 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3736 JavaThread* jt = (JavaThread*) THREAD;
3738 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3739 ClassLoader::perf_class_parse_selftime(),
3740 NULL,
3741 jt->get_thread_stat()->perf_recursion_counts_addr(),
3742 jt->get_thread_stat()->perf_timers_addr(),
3743 PerfClassTraceTime::PARSE_CLASS);
3745 init_parsed_class_attributes(loader_data);
3747 if (JvmtiExport::should_post_class_file_load_hook()) {
3748 // Get the cached class file bytes (if any) from the class that
3749 // is being redefined or retransformed. We use jvmti_thread_state()
3750 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3751 // a JvmtiThreadState any earlier than necessary. This will help
3752 // avoid the bug described by 7126851.
3753 JvmtiThreadState *state = jt->jvmti_thread_state();
3754 if (state != NULL) {
3755 KlassHandle *h_class_being_redefined =
3756 state->get_class_being_redefined();
3757 if (h_class_being_redefined != NULL) {
3758 instanceKlassHandle ikh_class_being_redefined =
3759 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3760 cached_class_file = ikh_class_being_redefined->get_cached_class_file();
3761 }
3762 }
3764 unsigned char* ptr = cfs->buffer();
3765 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3767 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3768 &ptr, &end_ptr, &cached_class_file);
3770 if (ptr != cfs->buffer()) {
3771 // JVMTI agent has modified class file data.
3772 // Set new class file stream using JVMTI agent modified
3773 // class file data.
3774 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3775 set_stream(cfs);
3776 }
3777 }
3779 _host_klass = host_klass;
3780 _cp_patches = cp_patches;
3782 instanceKlassHandle nullHandle;
3784 // Figure out whether we can skip format checking (matching classic VM behavior)
3785 if (DumpSharedSpaces) {
3786 // verify == true means it's a 'remote' class (i.e., non-boot class)
3787 // Verification decision is based on BytecodeVerificationRemote flag
3788 // for those classes.
3789 _need_verify = (verify) ? BytecodeVerificationRemote :
3790 BytecodeVerificationLocal;
3791 } else {
3792 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3793 }
3795 // Set the verify flag in stream
3796 cfs->set_verify(_need_verify);
3798 // Save the class file name for easier error message printing.
3799 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3801 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3802 // Magic value
3803 u4 magic = cfs->get_u4_fast();
3804 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3805 "Incompatible magic value %u in class file %s",
3806 magic, CHECK_(nullHandle));
3808 // Version numbers
3809 u2 minor_version = cfs->get_u2_fast();
3810 u2 major_version = cfs->get_u2_fast();
3812 if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) {
3813 ResourceMark rm;
3814 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
3815 major_version, minor_version, name->as_C_string());
3816 Exceptions::fthrow(
3817 THREAD_AND_LOCATION,
3818 vmSymbols::java_lang_UnsupportedClassVersionError(),
3819 "Unsupported major.minor version for dump time %u.%u",
3820 major_version,
3821 minor_version);
3822 }
3824 // Check version numbers - we check this even with verifier off
3825 if (!is_supported_version(major_version, minor_version)) {
3826 if (name == NULL) {
3827 Exceptions::fthrow(
3828 THREAD_AND_LOCATION,
3829 vmSymbols::java_lang_UnsupportedClassVersionError(),
3830 "Unsupported class file version %u.%u, "
3831 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3832 major_version,
3833 minor_version,
3834 JAVA_MAX_SUPPORTED_VERSION,
3835 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3836 } else {
3837 ResourceMark rm(THREAD);
3838 Exceptions::fthrow(
3839 THREAD_AND_LOCATION,
3840 vmSymbols::java_lang_UnsupportedClassVersionError(),
3841 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
3842 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3843 name->as_C_string(),
3844 major_version,
3845 minor_version,
3846 JAVA_MAX_SUPPORTED_VERSION,
3847 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3848 }
3849 return nullHandle;
3850 }
3852 _major_version = major_version;
3853 _minor_version = minor_version;
3856 // Check if verification needs to be relaxed for this class file
3857 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3858 _relax_verify = Verifier::relax_verify_for(class_loader());
3860 // Constant pool
3861 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3863 int cp_size = cp->length();
3865 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3867 // Access flags
3868 AccessFlags access_flags;
3869 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3871 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3872 // Set abstract bit for old class files for backward compatibility
3873 flags |= JVM_ACC_ABSTRACT;
3874 }
3875 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3876 access_flags.set_flags(flags);
3878 // This class and superclass
3879 u2 this_class_index = cfs->get_u2_fast();
3880 check_property(
3881 valid_cp_range(this_class_index, cp_size) &&
3882 cp->tag_at(this_class_index).is_unresolved_klass(),
3883 "Invalid this class index %u in constant pool in class file %s",
3884 this_class_index, CHECK_(nullHandle));
3886 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
3887 assert(class_name != NULL, "class_name can't be null");
3889 // It's important to set parsed_name *before* resolving the super class.
3890 // (it's used for cleanup by the caller if parsing fails)
3891 parsed_name = class_name;
3892 // parsed_name is returned and can be used if there's an error, so add to
3893 // its reference count. Caller will decrement the refcount.
3894 parsed_name->increment_refcount();
3896 // Update _class_name which could be null previously to be class_name
3897 _class_name = class_name;
3899 // Don't need to check whether this class name is legal or not.
3900 // It has been checked when constant pool is parsed.
3901 // However, make sure it is not an array type.
3902 if (_need_verify) {
3903 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3904 "Bad class name in class file %s",
3905 CHECK_(nullHandle));
3906 }
3908 Klass* preserve_this_klass; // for storing result across HandleMark
3910 // release all handles when parsing is done
3911 { HandleMark hm(THREAD);
3913 // Checks if name in class file matches requested name
3914 if (name != NULL && class_name != name) {
3915 ResourceMark rm(THREAD);
3916 Exceptions::fthrow(
3917 THREAD_AND_LOCATION,
3918 vmSymbols::java_lang_NoClassDefFoundError(),
3919 "%s (wrong name: %s)",
3920 name->as_C_string(),
3921 class_name->as_C_string()
3922 );
3923 return nullHandle;
3924 }
3926 if (TraceClassLoadingPreorder) {
3927 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3928 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3929 tty->print_cr("]");
3930 }
3931 #if INCLUDE_CDS
3932 if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) {
3933 // Only dump the classes that can be stored into CDS archive
3934 if (SystemDictionaryShared::is_sharing_possible(loader_data)) {
3935 if (name != NULL) {
3936 ResourceMark rm(THREAD);
3937 classlist_file->print_cr("%s", name->as_C_string());
3938 classlist_file->flush();
3939 }
3940 }
3941 }
3942 #endif
3944 u2 super_class_index = cfs->get_u2_fast();
3945 instanceKlassHandle super_klass = parse_super_class(super_class_index,
3946 CHECK_NULL);
3948 // Interfaces
3949 u2 itfs_len = cfs->get_u2_fast();
3950 Array<Klass*>* local_interfaces =
3951 parse_interfaces(itfs_len, protection_domain, _class_name,
3952 &has_default_methods, CHECK_(nullHandle));
3954 u2 java_fields_count = 0;
3955 // Fields (offsets are filled in later)
3956 FieldAllocationCount fac;
3957 Array<u2>* fields = parse_fields(class_name,
3958 access_flags.is_interface(),
3959 &fac, &java_fields_count,
3960 CHECK_(nullHandle));
3961 // Methods
3962 bool has_final_method = false;
3963 AccessFlags promoted_flags;
3964 promoted_flags.set_flags(0);
3965 Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3966 &promoted_flags,
3967 &has_final_method,
3968 &declares_default_methods,
3969 CHECK_(nullHandle));
3970 if (declares_default_methods) {
3971 has_default_methods = true;
3972 }
3974 // Additional attributes
3975 ClassAnnotationCollector parsed_annotations;
3976 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
3978 // Finalize the Annotations metadata object,
3979 // now that all annotation arrays have been created.
3980 create_combined_annotations(CHECK_(nullHandle));
3982 // Make sure this is the end of class file stream
3983 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3985 if (_class_name == vmSymbols::java_lang_Object()) {
3986 check_property(_local_interfaces == Universe::the_empty_klass_array(),
3987 "java.lang.Object cannot implement an interface in class file %s",
3988 CHECK_(nullHandle));
3989 }
3990 // We check super class after class file is parsed and format is checked
3991 if (super_class_index > 0 && super_klass.is_null()) {
3992 Symbol* sk = cp->klass_name_at(super_class_index);
3993 if (access_flags.is_interface()) {
3994 // Before attempting to resolve the superclass, check for class format
3995 // errors not checked yet.
3996 guarantee_property(sk == vmSymbols::java_lang_Object(),
3997 "Interfaces must have java.lang.Object as superclass in class file %s",
3998 CHECK_(nullHandle));
3999 }
4000 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
4001 class_loader,
4002 protection_domain,
4003 true,
4004 CHECK_(nullHandle));
4006 KlassHandle kh (THREAD, k);
4007 super_klass = instanceKlassHandle(THREAD, kh());
4008 }
4009 if (super_klass.not_null()) {
4011 if (super_klass->has_default_methods()) {
4012 has_default_methods = true;
4013 }
4015 if (super_klass->is_interface()) {
4016 ResourceMark rm(THREAD);
4017 Exceptions::fthrow(
4018 THREAD_AND_LOCATION,
4019 vmSymbols::java_lang_IncompatibleClassChangeError(),
4020 "class %s has interface %s as super class",
4021 class_name->as_klass_external_name(),
4022 super_klass->external_name()
4023 );
4024 return nullHandle;
4025 }
4026 // Make sure super class is not final
4027 if (super_klass->is_final()) {
4028 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
4029 }
4030 }
4032 // save super klass for error handling.
4033 _super_klass = super_klass;
4035 // Compute the transitive list of all unique interfaces implemented by this class
4036 _transitive_interfaces =
4037 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
4039 // sort methods
4040 intArray* method_ordering = sort_methods(methods);
4042 // promote flags from parse_methods() to the klass' flags
4043 access_flags.add_promoted_flags(promoted_flags.as_int());
4045 // Size of Java vtable (in words)
4046 int vtable_size = 0;
4047 int itable_size = 0;
4048 int num_miranda_methods = 0;
4050 GrowableArray<Method*> all_mirandas(20);
4052 klassVtable::compute_vtable_size_and_num_mirandas(
4053 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
4054 access_flags, class_loader, class_name, local_interfaces,
4055 CHECK_(nullHandle));
4057 // Size of Java itable (in words)
4058 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
4060 FieldLayoutInfo info;
4061 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
4063 int total_oop_map_size2 =
4064 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
4066 // Compute reference type
4067 ReferenceType rt;
4068 if (super_klass() == NULL) {
4069 rt = REF_NONE;
4070 } else {
4071 rt = super_klass->reference_type();
4072 }
4074 // We can now create the basic Klass* for this klass
4075 _klass = InstanceKlass::allocate_instance_klass(loader_data,
4076 vtable_size,
4077 itable_size,
4078 info.static_field_size,
4079 total_oop_map_size2,
4080 rt,
4081 access_flags,
4082 name,
4083 super_klass(),
4084 !host_klass.is_null(),
4085 CHECK_(nullHandle));
4086 instanceKlassHandle this_klass (THREAD, _klass);
4088 assert(this_klass->static_field_size() == info.static_field_size, "sanity");
4089 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
4090 "sanity");
4092 // Fill in information already parsed
4093 this_klass->set_should_verify_class(verify);
4094 jint lh = Klass::instance_layout_helper(info.instance_size, false);
4095 this_klass->set_layout_helper(lh);
4096 assert(this_klass->oop_is_instance(), "layout is correct");
4097 assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
4098 // Not yet: supers are done below to support the new subtype-checking fields
4099 //this_klass->set_super(super_klass());
4100 this_klass->set_class_loader_data(loader_data);
4101 this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
4102 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
4103 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
4105 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
4107 if (has_final_method) {
4108 this_klass->set_has_final_method();
4109 }
4110 this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
4111 // The InstanceKlass::_methods_jmethod_ids cache
4112 // is managed on the assumption that the initial cache
4113 // size is equal to the number of methods in the class. If
4114 // that changes, then InstanceKlass::idnum_can_increment()
4115 // has to be changed accordingly.
4116 this_klass->set_initial_method_idnum(methods->length());
4117 this_klass->set_name(cp->klass_name_at(this_class_index));
4118 if (is_anonymous()) // I am well known to myself
4119 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4121 this_klass->set_minor_version(minor_version);
4122 this_klass->set_major_version(major_version);
4123 this_klass->set_has_default_methods(has_default_methods);
4124 this_klass->set_declares_default_methods(declares_default_methods);
4126 if (!host_klass.is_null()) {
4127 assert (this_klass->is_anonymous(), "should be the same");
4128 this_klass->set_host_klass(host_klass());
4129 }
4131 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4132 // (We used to do this lazily, but now we query it in Rewriter,
4133 // which is eagerly done for every method, so we might as well do it now,
4134 // when everything is fresh in memory.)
4135 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) {
4136 for (int j = 0; j < methods->length(); j++) {
4137 methods->at(j)->init_intrinsic_id();
4138 }
4139 }
4141 if (cached_class_file != NULL) {
4142 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4143 this_klass->set_cached_class_file(cached_class_file);
4144 }
4146 // Fill in field values obtained by parse_classfile_attributes
4147 if (parsed_annotations.has_any_annotations())
4148 parsed_annotations.apply_to(this_klass);
4149 apply_parsed_class_attributes(this_klass);
4151 // Miranda methods
4152 if ((num_miranda_methods > 0) ||
4153 // if this class introduced new miranda methods or
4154 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4155 // super class exists and this class inherited miranda methods
4156 ) {
4157 this_klass->set_has_miranda_methods(); // then set a flag
4158 }
4160 // Fill in information needed to compute superclasses.
4161 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4163 // Initialize itable offset tables
4164 klassItable::setup_itable_offset_table(this_klass);
4166 // Compute transitive closure of interfaces this class implements
4167 // Do final class setup
4168 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4170 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4171 set_precomputed_flags(this_klass);
4173 // reinitialize modifiers, using the InnerClasses attribute
4174 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4175 this_klass->set_modifier_flags(computed_modifiers);
4177 // check if this class can access its super class
4178 check_super_class_access(this_klass, CHECK_(nullHandle));
4180 // check if this class can access its superinterfaces
4181 check_super_interface_access(this_klass, CHECK_(nullHandle));
4183 // check if this class overrides any final method
4184 check_final_method_override(this_klass, CHECK_(nullHandle));
4186 // check that if this class is an interface then it doesn't have static methods
4187 if (this_klass->is_interface()) {
4188 /* An interface in a JAVA 8 classfile can be static */
4189 if (_major_version < JAVA_8_VERSION) {
4190 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4191 }
4192 }
4194 // Allocate mirror and initialize static fields
4195 java_lang_Class::create_mirror(this_klass, class_loader, protection_domain,
4196 CHECK_(nullHandle));
4198 // Generate any default methods - default methods are interface methods
4199 // that have a default implementation. This is new with Lambda project.
4200 if (has_default_methods ) {
4201 DefaultMethods::generate_default_methods(
4202 this_klass(), &all_mirandas, CHECK_(nullHandle));
4203 }
4205 // Update the loader_data graph.
4206 record_defined_class_dependencies(this_klass, CHECK_NULL);
4208 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4209 false /* not shared class */);
4211 if (TraceClassLoading) {
4212 ResourceMark rm;
4213 // print in a single call to reduce interleaving of output
4214 if (cfs->source() != NULL) {
4215 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4216 cfs->source());
4217 } else if (class_loader.is_null()) {
4218 Klass* caller =
4219 THREAD->is_Java_thread()
4220 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
4221 : NULL;
4222 // caller can be NULL, for example, during a JVMTI VM_Init hook
4223 if (caller != NULL) {
4224 tty->print("[Loaded %s by instance of %s]\n",
4225 this_klass->external_name(),
4226 InstanceKlass::cast(caller)->external_name());
4227 } else {
4228 tty->print("[Loaded %s]\n", this_klass->external_name());
4229 }
4230 } else {
4231 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4232 InstanceKlass::cast(class_loader->klass())->external_name());
4233 }
4234 }
4236 if (TraceClassResolution) {
4237 ResourceMark rm;
4238 // print out the superclass.
4239 const char * from = this_klass()->external_name();
4240 if (this_klass->java_super() != NULL) {
4241 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4242 }
4243 // print out each of the interface classes referred to by this class.
4244 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4245 if (local_interfaces != NULL) {
4246 int length = local_interfaces->length();
4247 for (int i = 0; i < length; i++) {
4248 Klass* k = local_interfaces->at(i);
4249 InstanceKlass* to_class = InstanceKlass::cast(k);
4250 const char * to = to_class->external_name();
4251 tty->print("RESOLVE %s %s (interface)\n", from, to);
4252 }
4253 }
4254 }
4256 // preserve result across HandleMark
4257 preserve_this_klass = this_klass();
4258 }
4260 // Create new handle outside HandleMark (might be needed for
4261 // Extended Class Redefinition)
4262 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4263 debug_only(this_klass->verify();)
4265 // Clear class if no error has occurred so destructor doesn't deallocate it
4266 _klass = NULL;
4267 return this_klass;
4268 }
4270 // Destructor to clean up if there's an error
4271 ClassFileParser::~ClassFileParser() {
4272 MetadataFactory::free_metadata(_loader_data, _cp);
4273 MetadataFactory::free_array<u2>(_loader_data, _fields);
4275 // Free methods
4276 InstanceKlass::deallocate_methods(_loader_data, _methods);
4278 // beware of the Universe::empty_blah_array!!
4279 if (_inner_classes != Universe::the_empty_short_array()) {
4280 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4281 }
4283 // Free interfaces
4284 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4285 _local_interfaces, _transitive_interfaces);
4287 if (_combined_annotations != NULL) {
4288 // After all annotations arrays have been created, they are installed into the
4289 // Annotations object that will be assigned to the InstanceKlass being created.
4291 // Deallocate the Annotations object and the installed annotations arrays.
4292 _combined_annotations->deallocate_contents(_loader_data);
4294 // If the _combined_annotations pointer is non-NULL,
4295 // then the other annotations fields should have been cleared.
4296 assert(_annotations == NULL, "Should have been cleared");
4297 assert(_type_annotations == NULL, "Should have been cleared");
4298 assert(_fields_annotations == NULL, "Should have been cleared");
4299 assert(_fields_type_annotations == NULL, "Should have been cleared");
4300 } else {
4301 // If the annotations arrays were not installed into the Annotations object,
4302 // then they have to be deallocated explicitly.
4303 MetadataFactory::free_array<u1>(_loader_data, _annotations);
4304 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4305 Annotations::free_contents(_loader_data, _fields_annotations);
4306 Annotations::free_contents(_loader_data, _fields_type_annotations);
4307 }
4309 clear_class_metadata();
4311 // deallocate the klass if already created. Don't directly deallocate, but add
4312 // to the deallocate list so that the klass is removed from the CLD::_klasses list
4313 // at a safepoint.
4314 if (_klass != NULL) {
4315 _loader_data->add_to_deallocate_list(_klass);
4316 }
4317 _klass = NULL;
4318 }
4320 void ClassFileParser::print_field_layout(Symbol* name,
4321 Array<u2>* fields,
4322 constantPoolHandle cp,
4323 int instance_size,
4324 int instance_fields_start,
4325 int instance_fields_end,
4326 int static_fields_end) {
4327 tty->print("%s: field layout\n", name->as_klass_external_name());
4328 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4329 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4330 if (!fs.access_flags().is_static()) {
4331 tty->print(" @%3d \"%s\" %s\n",
4332 fs.offset(),
4333 fs.name()->as_klass_external_name(),
4334 fs.signature()->as_klass_external_name());
4335 }
4336 }
4337 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4338 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4339 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4340 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4341 if (fs.access_flags().is_static()) {
4342 tty->print(" @%3d \"%s\" %s\n",
4343 fs.offset(),
4344 fs.name()->as_klass_external_name(),
4345 fs.signature()->as_klass_external_name());
4346 }
4347 }
4348 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4349 tty->print("\n");
4350 }
4352 unsigned int
4353 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4354 unsigned int nonstatic_oop_map_count,
4355 int first_nonstatic_oop_offset) {
4356 unsigned int map_count =
4357 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4358 if (nonstatic_oop_map_count > 0) {
4359 // We have oops to add to map
4360 if (map_count == 0) {
4361 map_count = nonstatic_oop_map_count;
4362 } else {
4363 // Check whether we should add a new map block or whether the last one can
4364 // be extended
4365 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4366 OopMapBlock* const last_map = first_map + map_count - 1;
4368 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4369 if (next_offset == first_nonstatic_oop_offset) {
4370 // There is no gap bettwen superklass's last oop field and first
4371 // local oop field, merge maps.
4372 nonstatic_oop_map_count -= 1;
4373 } else {
4374 // Superklass didn't end with a oop field, add extra maps
4375 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4376 }
4377 map_count += nonstatic_oop_map_count;
4378 }
4379 }
4380 return map_count;
4381 }
4384 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4385 unsigned int nonstatic_oop_map_count,
4386 int* nonstatic_oop_offsets,
4387 unsigned int* nonstatic_oop_counts) {
4388 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4389 const InstanceKlass* const super = k->superklass();
4390 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4391 if (super_count > 0) {
4392 // Copy maps from superklass
4393 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4394 for (unsigned int i = 0; i < super_count; ++i) {
4395 *this_oop_map++ = *super_oop_map++;
4396 }
4397 }
4399 if (nonstatic_oop_map_count > 0) {
4400 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4401 // The counts differ because there is no gap between superklass's last oop
4402 // field and the first local oop field. Extend the last oop map copied
4403 // from the superklass instead of creating new one.
4404 nonstatic_oop_map_count--;
4405 nonstatic_oop_offsets++;
4406 this_oop_map--;
4407 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4408 this_oop_map++;
4409 }
4411 // Add new map blocks, fill them
4412 while (nonstatic_oop_map_count-- > 0) {
4413 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4414 this_oop_map->set_count(*nonstatic_oop_counts++);
4415 this_oop_map++;
4416 }
4417 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4418 this_oop_map, "sanity");
4419 }
4420 }
4423 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4424 Klass* super = k->super();
4426 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4427 // in which case we don't have to register objects as finalizable
4428 if (!_has_empty_finalizer) {
4429 if (_has_finalizer ||
4430 (super != NULL && super->has_finalizer())) {
4431 k->set_has_finalizer();
4432 }
4433 }
4435 #ifdef ASSERT
4436 bool f = false;
4437 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4438 vmSymbols::void_method_signature());
4439 if (m != NULL && !m->is_empty_method()) {
4440 f = true;
4441 }
4443 // Spec doesn't prevent agent from redefinition of empty finalizer.
4444 // Despite the fact that it's generally bad idea and redefined finalizer
4445 // will not work as expected we shouldn't abort vm in this case
4446 if (!k->has_redefined_this_or_super()) {
4447 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4448 }
4449 #endif
4451 // Check if this klass supports the java.lang.Cloneable interface
4452 if (SystemDictionary::Cloneable_klass_loaded()) {
4453 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4454 k->set_is_cloneable();
4455 }
4456 }
4458 // Check if this klass has a vanilla default constructor
4459 if (super == NULL) {
4460 // java.lang.Object has empty default constructor
4461 k->set_has_vanilla_constructor();
4462 } else {
4463 if (super->has_vanilla_constructor() &&
4464 _has_vanilla_constructor) {
4465 k->set_has_vanilla_constructor();
4466 }
4467 #ifdef ASSERT
4468 bool v = false;
4469 if (super->has_vanilla_constructor()) {
4470 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4471 ), vmSymbols::void_method_signature());
4472 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4473 v = true;
4474 }
4475 }
4476 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4477 #endif
4478 }
4480 // If it cannot be fast-path allocated, set a bit in the layout helper.
4481 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4482 assert(k->size_helper() > 0, "layout_helper is initialized");
4483 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4484 || k->is_abstract() || k->is_interface()
4485 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4486 || k->size_helper() >= FastAllocateSizeLimit) {
4487 // Forbid fast-path allocation.
4488 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4489 k->set_layout_helper(lh);
4490 }
4491 }
4493 // Attach super classes and interface classes to class loader data
4494 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4495 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4496 if (defining_loader_data->is_the_null_class_loader_data()) {
4497 // Dependencies to null class loader data are implicit.
4498 return;
4499 } else {
4500 // add super class dependency
4501 Klass* super = defined_klass->super();
4502 if (super != NULL) {
4503 defining_loader_data->record_dependency(super, CHECK);
4504 }
4506 // add super interface dependencies
4507 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4508 if (local_interfaces != NULL) {
4509 int length = local_interfaces->length();
4510 for (int i = 0; i < length; i++) {
4511 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4512 }
4513 }
4514 }
4515 }
4517 // utility methods for appending an array with check for duplicates
4519 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4520 // iterate over new interfaces
4521 for (int i = 0; i < ifs->length(); i++) {
4522 Klass* e = ifs->at(i);
4523 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4524 // add new interface
4525 result->append_if_missing(e);
4526 }
4527 }
4529 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4530 instanceKlassHandle super,
4531 Array<Klass*>* local_ifs, TRAPS) {
4532 // Compute maximum size for transitive interfaces
4533 int max_transitive_size = 0;
4534 int super_size = 0;
4535 // Add superclass transitive interfaces size
4536 if (super.not_null()) {
4537 super_size = super->transitive_interfaces()->length();
4538 max_transitive_size += super_size;
4539 }
4540 // Add local interfaces' super interfaces
4541 int local_size = local_ifs->length();
4542 for (int i = 0; i < local_size; i++) {
4543 Klass* l = local_ifs->at(i);
4544 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4545 }
4546 // Finally add local interfaces
4547 max_transitive_size += local_size;
4548 // Construct array
4549 if (max_transitive_size == 0) {
4550 // no interfaces, use canonicalized array
4551 return Universe::the_empty_klass_array();
4552 } else if (max_transitive_size == super_size) {
4553 // no new local interfaces added, share superklass' transitive interface array
4554 return super->transitive_interfaces();
4555 } else if (max_transitive_size == local_size) {
4556 // only local interfaces added, share local interface array
4557 return local_ifs;
4558 } else {
4559 ResourceMark rm;
4560 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4562 // Copy down from superclass
4563 if (super.not_null()) {
4564 append_interfaces(result, super->transitive_interfaces());
4565 }
4567 // Copy down from local interfaces' superinterfaces
4568 for (int i = 0; i < local_ifs->length(); i++) {
4569 Klass* l = local_ifs->at(i);
4570 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4571 }
4572 // Finally add local interfaces
4573 append_interfaces(result, local_ifs);
4575 // length will be less than the max_transitive_size if duplicates were removed
4576 int length = result->length();
4577 assert(length <= max_transitive_size, "just checking");
4578 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4579 for (int i = 0; i < length; i++) {
4580 Klass* e = result->at(i);
4581 assert(e != NULL, "just checking");
4582 new_result->at_put(i, e);
4583 }
4584 return new_result;
4585 }
4586 }
4588 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4589 Klass* super = this_klass->super();
4590 if ((super != NULL) &&
4591 (!Reflection::verify_class_access(this_klass(), super, false))) {
4592 ResourceMark rm(THREAD);
4593 Exceptions::fthrow(
4594 THREAD_AND_LOCATION,
4595 vmSymbols::java_lang_IllegalAccessError(),
4596 "class %s cannot access its superclass %s",
4597 this_klass->external_name(),
4598 InstanceKlass::cast(super)->external_name()
4599 );
4600 return;
4601 }
4602 }
4605 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4606 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4607 int lng = local_interfaces->length();
4608 for (int i = lng - 1; i >= 0; i--) {
4609 Klass* k = local_interfaces->at(i);
4610 assert (k != NULL && k->is_interface(), "invalid interface");
4611 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4612 ResourceMark rm(THREAD);
4613 Exceptions::fthrow(
4614 THREAD_AND_LOCATION,
4615 vmSymbols::java_lang_IllegalAccessError(),
4616 "class %s cannot access its superinterface %s",
4617 this_klass->external_name(),
4618 InstanceKlass::cast(k)->external_name()
4619 );
4620 return;
4621 }
4622 }
4623 }
4626 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4627 Array<Method*>* methods = this_klass->methods();
4628 int num_methods = methods->length();
4630 // go thru each method and check if it overrides a final method
4631 for (int index = 0; index < num_methods; index++) {
4632 Method* m = methods->at(index);
4634 // skip private, static, and <init> methods
4635 if ((!m->is_private() && !m->is_static()) &&
4636 (m->name() != vmSymbols::object_initializer_name())) {
4638 Symbol* name = m->name();
4639 Symbol* signature = m->signature();
4640 Klass* k = this_klass->super();
4641 Method* super_m = NULL;
4642 while (k != NULL) {
4643 // skip supers that don't have final methods.
4644 if (k->has_final_method()) {
4645 // lookup a matching method in the super class hierarchy
4646 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4647 if (super_m == NULL) {
4648 break; // didn't find any match; get out
4649 }
4651 if (super_m->is_final() && !super_m->is_static() &&
4652 // matching method in super is final, and not static
4653 (Reflection::verify_field_access(this_klass(),
4654 super_m->method_holder(),
4655 super_m->method_holder(),
4656 super_m->access_flags(), false))
4657 // this class can access super final method and therefore override
4658 ) {
4659 ResourceMark rm(THREAD);
4660 Exceptions::fthrow(
4661 THREAD_AND_LOCATION,
4662 vmSymbols::java_lang_VerifyError(),
4663 "class %s overrides final method %s.%s",
4664 this_klass->external_name(),
4665 name->as_C_string(),
4666 signature->as_C_string()
4667 );
4668 return;
4669 }
4671 // continue to look from super_m's holder's super.
4672 k = super_m->method_holder()->super();
4673 continue;
4674 }
4676 k = k->super();
4677 }
4678 }
4679 }
4680 }
4683 // assumes that this_klass is an interface
4684 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4685 assert(this_klass->is_interface(), "not an interface");
4686 Array<Method*>* methods = this_klass->methods();
4687 int num_methods = methods->length();
4689 for (int index = 0; index < num_methods; index++) {
4690 Method* m = methods->at(index);
4691 // if m is static and not the init method, throw a verify error
4692 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4693 ResourceMark rm(THREAD);
4694 Exceptions::fthrow(
4695 THREAD_AND_LOCATION,
4696 vmSymbols::java_lang_VerifyError(),
4697 "Illegal static method %s in interface %s",
4698 m->name()->as_C_string(),
4699 this_klass->external_name()
4700 );
4701 return;
4702 }
4703 }
4704 }
4706 // utility methods for format checking
4708 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4709 if (!_need_verify) { return; }
4711 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4712 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4713 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4714 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4715 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4716 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4717 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4719 if ((is_abstract && is_final) ||
4720 (is_interface && !is_abstract) ||
4721 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4722 (!is_interface && major_gte_15 && is_annotation)) {
4723 ResourceMark rm(THREAD);
4724 Exceptions::fthrow(
4725 THREAD_AND_LOCATION,
4726 vmSymbols::java_lang_ClassFormatError(),
4727 "Illegal class modifiers in class %s: 0x%X",
4728 _class_name->as_C_string(), flags
4729 );
4730 return;
4731 }
4732 }
4734 bool ClassFileParser::has_illegal_visibility(jint flags) {
4735 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4736 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4737 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4739 return ((is_public && is_protected) ||
4740 (is_public && is_private) ||
4741 (is_protected && is_private));
4742 }
4744 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4745 u2 max_version =
4746 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4747 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4748 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4749 (major <= max_version) &&
4750 ((major != max_version) ||
4751 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4752 }
4754 void ClassFileParser::verify_legal_field_modifiers(
4755 jint flags, bool is_interface, TRAPS) {
4756 if (!_need_verify) { return; }
4758 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4759 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4760 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4761 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4762 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4763 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4764 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4765 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4766 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4768 bool is_illegal = false;
4770 if (is_interface) {
4771 if (!is_public || !is_static || !is_final || is_private ||
4772 is_protected || is_volatile || is_transient ||
4773 (major_gte_15 && is_enum)) {
4774 is_illegal = true;
4775 }
4776 } else { // not interface
4777 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4778 is_illegal = true;
4779 }
4780 }
4782 if (is_illegal) {
4783 ResourceMark rm(THREAD);
4784 Exceptions::fthrow(
4785 THREAD_AND_LOCATION,
4786 vmSymbols::java_lang_ClassFormatError(),
4787 "Illegal field modifiers in class %s: 0x%X",
4788 _class_name->as_C_string(), flags);
4789 return;
4790 }
4791 }
4793 void ClassFileParser::verify_legal_method_modifiers(
4794 jint flags, bool is_interface, Symbol* name, TRAPS) {
4795 if (!_need_verify) { return; }
4797 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4798 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4799 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4800 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4801 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4802 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4803 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4804 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4805 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4806 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4807 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4808 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4809 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4811 bool is_illegal = false;
4813 if (is_interface) {
4814 if (major_gte_8) {
4815 // Class file version is JAVA_8_VERSION or later Methods of
4816 // interfaces may set any of the flags except ACC_PROTECTED,
4817 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4818 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4819 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4820 (is_native || is_protected || is_final || is_synchronized) ||
4821 // If a specific method of a class or interface has its
4822 // ACC_ABSTRACT flag set, it must not have any of its
4823 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4824 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4825 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4826 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4827 (is_abstract && (is_private || is_static || is_strict))) {
4828 is_illegal = true;
4829 }
4830 } else if (major_gte_15) {
4831 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4832 if (!is_public || is_static || is_final || is_synchronized ||
4833 is_native || !is_abstract || is_strict) {
4834 is_illegal = true;
4835 }
4836 } else {
4837 // Class file version is pre-JAVA_1_5_VERSION
4838 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4839 is_illegal = true;
4840 }
4841 }
4842 } else { // not interface
4843 if (is_initializer) {
4844 if (is_static || is_final || is_synchronized || is_native ||
4845 is_abstract || (major_gte_15 && is_bridge)) {
4846 is_illegal = true;
4847 }
4848 } else { // not initializer
4849 if (is_abstract) {
4850 if ((is_final || is_native || is_private || is_static ||
4851 (major_gte_15 && (is_synchronized || is_strict)))) {
4852 is_illegal = true;
4853 }
4854 }
4855 if (has_illegal_visibility(flags)) {
4856 is_illegal = true;
4857 }
4858 }
4859 }
4861 if (is_illegal) {
4862 ResourceMark rm(THREAD);
4863 Exceptions::fthrow(
4864 THREAD_AND_LOCATION,
4865 vmSymbols::java_lang_ClassFormatError(),
4866 "Method %s in class %s has illegal modifiers: 0x%X",
4867 name->as_C_string(), _class_name->as_C_string(), flags);
4868 return;
4869 }
4870 }
4872 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4873 assert(_need_verify, "only called when _need_verify is true");
4874 int i = 0;
4875 int count = length >> 2;
4876 for (int k=0; k<count; k++) {
4877 unsigned char b0 = buffer[i];
4878 unsigned char b1 = buffer[i+1];
4879 unsigned char b2 = buffer[i+2];
4880 unsigned char b3 = buffer[i+3];
4881 // For an unsigned char v,
4882 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4883 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4884 unsigned char res = b0 | b0 - 1 |
4885 b1 | b1 - 1 |
4886 b2 | b2 - 1 |
4887 b3 | b3 - 1;
4888 if (res >= 128) break;
4889 i += 4;
4890 }
4891 for(; i < length; i++) {
4892 unsigned short c;
4893 // no embedded zeros
4894 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4895 if(buffer[i] < 128) {
4896 continue;
4897 }
4898 if ((i + 5) < length) { // see if it's legal supplementary character
4899 if (UTF8::is_supplementary_character(&buffer[i])) {
4900 c = UTF8::get_supplementary_character(&buffer[i]);
4901 i += 5;
4902 continue;
4903 }
4904 }
4905 switch (buffer[i] >> 4) {
4906 default: break;
4907 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4908 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4909 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4910 c = (buffer[i] & 0x1F) << 6;
4911 i++;
4912 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4913 c += buffer[i] & 0x3F;
4914 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4915 // for classes with major > 47, c must a null or a character in its shortest form
4916 break;
4917 }
4918 }
4919 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4920 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4921 c = (buffer[i] & 0xF) << 12;
4922 i += 2;
4923 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4924 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4925 if (_major_version <= 47 || c >= 0x800) {
4926 // for classes with major > 47, c must be in its shortest form
4927 break;
4928 }
4929 }
4930 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4931 } // end of switch
4932 } // end of for
4933 }
4935 // Checks if name is a legal class name.
4936 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4937 if (!_need_verify || _relax_verify) { return; }
4939 char buf[fixed_buffer_size];
4940 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4941 unsigned int length = name->utf8_length();
4942 bool legal = false;
4944 if (length > 0) {
4945 char* p;
4946 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4947 p = skip_over_field_signature(bytes, false, length, CHECK);
4948 legal = (p != NULL) && ((p - bytes) == (int)length);
4949 } else if (_major_version < JAVA_1_5_VERSION) {
4950 if (bytes[0] != '<') {
4951 p = skip_over_field_name(bytes, true, length);
4952 legal = (p != NULL) && ((p - bytes) == (int)length);
4953 }
4954 } else {
4955 // 4900761: relax the constraints based on JSR202 spec
4956 // Class names may be drawn from the entire Unicode character set.
4957 // Identifiers between '/' must be unqualified names.
4958 // The utf8 string has been verified when parsing cpool entries.
4959 legal = verify_unqualified_name(bytes, length, LegalClass);
4960 }
4961 }
4962 if (!legal) {
4963 ResourceMark rm(THREAD);
4964 Exceptions::fthrow(
4965 THREAD_AND_LOCATION,
4966 vmSymbols::java_lang_ClassFormatError(),
4967 "Illegal class name \"%s\" in class file %s", bytes,
4968 _class_name->as_C_string()
4969 );
4970 return;
4971 }
4972 }
4974 // Checks if name is a legal field name.
4975 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4976 if (!_need_verify || _relax_verify) { return; }
4978 char buf[fixed_buffer_size];
4979 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4980 unsigned int length = name->utf8_length();
4981 bool legal = false;
4983 if (length > 0) {
4984 if (_major_version < JAVA_1_5_VERSION) {
4985 if (bytes[0] != '<') {
4986 char* p = skip_over_field_name(bytes, false, length);
4987 legal = (p != NULL) && ((p - bytes) == (int)length);
4988 }
4989 } else {
4990 // 4881221: relax the constraints based on JSR202 spec
4991 legal = verify_unqualified_name(bytes, length, LegalField);
4992 }
4993 }
4995 if (!legal) {
4996 ResourceMark rm(THREAD);
4997 Exceptions::fthrow(
4998 THREAD_AND_LOCATION,
4999 vmSymbols::java_lang_ClassFormatError(),
5000 "Illegal field name \"%s\" in class %s", bytes,
5001 _class_name->as_C_string()
5002 );
5003 return;
5004 }
5005 }
5007 // Checks if name is a legal method name.
5008 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
5009 if (!_need_verify || _relax_verify) { return; }
5011 assert(name != NULL, "method name is null");
5012 char buf[fixed_buffer_size];
5013 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5014 unsigned int length = name->utf8_length();
5015 bool legal = false;
5017 if (length > 0) {
5018 if (bytes[0] == '<') {
5019 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5020 legal = true;
5021 }
5022 } else if (_major_version < JAVA_1_5_VERSION) {
5023 char* p;
5024 p = skip_over_field_name(bytes, false, length);
5025 legal = (p != NULL) && ((p - bytes) == (int)length);
5026 } else {
5027 // 4881221: relax the constraints based on JSR202 spec
5028 legal = verify_unqualified_name(bytes, length, LegalMethod);
5029 }
5030 }
5032 if (!legal) {
5033 ResourceMark rm(THREAD);
5034 Exceptions::fthrow(
5035 THREAD_AND_LOCATION,
5036 vmSymbols::java_lang_ClassFormatError(),
5037 "Illegal method name \"%s\" in class %s", bytes,
5038 _class_name->as_C_string()
5039 );
5040 return;
5041 }
5042 }
5045 // Checks if signature is a legal field signature.
5046 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
5047 if (!_need_verify) { return; }
5049 char buf[fixed_buffer_size];
5050 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5051 unsigned int length = signature->utf8_length();
5052 char* p = skip_over_field_signature(bytes, false, length, CHECK);
5054 if (p == NULL || (p - bytes) != (int)length) {
5055 throwIllegalSignature("Field", name, signature, CHECK);
5056 }
5057 }
5059 // Checks if signature is a legal method signature.
5060 // Returns number of parameters
5061 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
5062 if (!_need_verify) {
5063 // make sure caller's args_size will be less than 0 even for non-static
5064 // method so it will be recomputed in compute_size_of_parameters().
5065 return -2;
5066 }
5068 unsigned int args_size = 0;
5069 char buf[fixed_buffer_size];
5070 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5071 unsigned int length = signature->utf8_length();
5072 char* nextp;
5074 // The first character must be a '('
5075 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5076 length--;
5077 // Skip over legal field signatures
5078 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5079 while ((length > 0) && (nextp != NULL)) {
5080 args_size++;
5081 if (p[0] == 'J' || p[0] == 'D') {
5082 args_size++;
5083 }
5084 length -= nextp - p;
5085 p = nextp;
5086 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5087 }
5088 // The first non-signature thing better be a ')'
5089 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5090 length--;
5091 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5092 // All internal methods must return void
5093 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5094 return args_size;
5095 }
5096 } else {
5097 // Now we better just have a return value
5098 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5099 if (nextp && ((int)length == (nextp - p))) {
5100 return args_size;
5101 }
5102 }
5103 }
5104 }
5105 // Report error
5106 throwIllegalSignature("Method", name, signature, CHECK_0);
5107 return 0;
5108 }
5111 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5112 // Method names also may not contain the characters '<' or '>', unless <init>
5113 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5114 // method. Because these names have been checked as special cases before
5115 // calling this method in verify_legal_method_name.
5116 bool ClassFileParser::verify_unqualified_name(
5117 char* name, unsigned int length, int type) {
5118 jchar ch;
5120 for (char* p = name; p != name + length; ) {
5121 ch = *p;
5122 if (ch < 128) {
5123 p++;
5124 if (ch == '.' || ch == ';' || ch == '[' ) {
5125 return false; // do not permit '.', ';', or '['
5126 }
5127 if (type != LegalClass && ch == '/') {
5128 return false; // do not permit '/' unless it's class name
5129 }
5130 if (type == LegalMethod && (ch == '<' || ch == '>')) {
5131 return false; // do not permit '<' or '>' in method names
5132 }
5133 } else {
5134 char* tmp_p = UTF8::next(p, &ch);
5135 p = tmp_p;
5136 }
5137 }
5138 return true;
5139 }
5142 // Take pointer to a string. Skip over the longest part of the string that could
5143 // be taken as a fieldname. Allow '/' if slash_ok is true.
5144 // Return a pointer to just past the fieldname.
5145 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5146 // being true, we saw consecutive slashes (meaning we were looking for a
5147 // qualified path but found something that was badly-formed).
5148 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5149 char* p;
5150 jchar ch;
5151 jboolean last_is_slash = false;
5152 jboolean not_first_ch = false;
5154 for (p = name; p != name + length; not_first_ch = true) {
5155 char* old_p = p;
5156 ch = *p;
5157 if (ch < 128) {
5158 p++;
5159 // quick check for ascii
5160 if ((ch >= 'a' && ch <= 'z') ||
5161 (ch >= 'A' && ch <= 'Z') ||
5162 (ch == '_' || ch == '$') ||
5163 (not_first_ch && ch >= '0' && ch <= '9')) {
5164 last_is_slash = false;
5165 continue;
5166 }
5167 if (slash_ok && ch == '/') {
5168 if (last_is_slash) {
5169 return NULL; // Don't permit consecutive slashes
5170 }
5171 last_is_slash = true;
5172 continue;
5173 }
5174 } else {
5175 jint unicode_ch;
5176 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5177 p = tmp_p;
5178 last_is_slash = false;
5179 // Check if ch is Java identifier start or is Java identifier part
5180 // 4672820: call java.lang.Character methods directly without generating separate tables.
5181 EXCEPTION_MARK;
5182 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5184 // return value
5185 JavaValue result(T_BOOLEAN);
5186 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5187 JavaCallArguments args;
5188 args.push_int(unicode_ch);
5190 // public static boolean isJavaIdentifierStart(char ch);
5191 JavaCalls::call_static(&result,
5192 klass,
5193 vmSymbols::isJavaIdentifierStart_name(),
5194 vmSymbols::int_bool_signature(),
5195 &args,
5196 THREAD);
5198 if (HAS_PENDING_EXCEPTION) {
5199 CLEAR_PENDING_EXCEPTION;
5200 return 0;
5201 }
5202 if (result.get_jboolean()) {
5203 continue;
5204 }
5206 if (not_first_ch) {
5207 // public static boolean isJavaIdentifierPart(char ch);
5208 JavaCalls::call_static(&result,
5209 klass,
5210 vmSymbols::isJavaIdentifierPart_name(),
5211 vmSymbols::int_bool_signature(),
5212 &args,
5213 THREAD);
5215 if (HAS_PENDING_EXCEPTION) {
5216 CLEAR_PENDING_EXCEPTION;
5217 return 0;
5218 }
5220 if (result.get_jboolean()) {
5221 continue;
5222 }
5223 }
5224 }
5225 return (not_first_ch) ? old_p : NULL;
5226 }
5227 return (not_first_ch) ? p : NULL;
5228 }
5231 // Take pointer to a string. Skip over the longest part of the string that could
5232 // be taken as a field signature. Allow "void" if void_ok.
5233 // Return a pointer to just past the signature.
5234 // Return NULL if no legal signature is found.
5235 char* ClassFileParser::skip_over_field_signature(char* signature,
5236 bool void_ok,
5237 unsigned int length,
5238 TRAPS) {
5239 unsigned int array_dim = 0;
5240 while (length > 0) {
5241 switch (signature[0]) {
5242 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5243 case JVM_SIGNATURE_BOOLEAN:
5244 case JVM_SIGNATURE_BYTE:
5245 case JVM_SIGNATURE_CHAR:
5246 case JVM_SIGNATURE_SHORT:
5247 case JVM_SIGNATURE_INT:
5248 case JVM_SIGNATURE_FLOAT:
5249 case JVM_SIGNATURE_LONG:
5250 case JVM_SIGNATURE_DOUBLE:
5251 return signature + 1;
5252 case JVM_SIGNATURE_CLASS: {
5253 if (_major_version < JAVA_1_5_VERSION) {
5254 // Skip over the class name if one is there
5255 char* p = skip_over_field_name(signature + 1, true, --length);
5257 // The next character better be a semicolon
5258 if (p && (p - signature) > 1 && p[0] == ';') {
5259 return p + 1;
5260 }
5261 } else {
5262 // 4900761: For class version > 48, any unicode is allowed in class name.
5263 length--;
5264 signature++;
5265 while (length > 0 && signature[0] != ';') {
5266 if (signature[0] == '.') {
5267 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5268 }
5269 length--;
5270 signature++;
5271 }
5272 if (signature[0] == ';') { return signature + 1; }
5273 }
5275 return NULL;
5276 }
5277 case JVM_SIGNATURE_ARRAY:
5278 array_dim++;
5279 if (array_dim > 255) {
5280 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5281 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5282 }
5283 // The rest of what's there better be a legal signature
5284 signature++;
5285 length--;
5286 void_ok = false;
5287 break;
5289 default:
5290 return NULL;
5291 }
5292 }
5293 return NULL;
5294 }