Sat, 02 Aug 2014 16:28:59 -0400
8051012: Regression in verifier for <init> method call from inside of a branch
Summary: Fix stackmap matching for branches.
Reviewed-by: coleenp, lfoltan, acorn
1 /*
2 * Copyright (c) 1997, 2014, 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 #include "classfile/verificationType.hpp"
35 #include "classfile/verifier.hpp"
36 #include "classfile/vmSymbols.hpp"
37 #include "memory/allocation.hpp"
38 #include "memory/gcLocker.hpp"
39 #include "memory/metadataFactory.hpp"
40 #include "memory/oopFactory.hpp"
41 #include "memory/referenceType.hpp"
42 #include "memory/universe.inline.hpp"
43 #include "oops/constantPool.hpp"
44 #include "oops/fieldStreams.hpp"
45 #include "oops/instanceKlass.hpp"
46 #include "oops/instanceMirrorKlass.hpp"
47 #include "oops/klass.inline.hpp"
48 #include "oops/klassVtable.hpp"
49 #include "oops/method.hpp"
50 #include "oops/symbol.hpp"
51 #include "prims/jvm.h"
52 #include "prims/jvmtiExport.hpp"
53 #include "prims/jvmtiThreadState.hpp"
54 #include "runtime/javaCalls.hpp"
55 #include "runtime/perfData.hpp"
56 #include "runtime/reflection.hpp"
57 #include "runtime/signature.hpp"
58 #include "runtime/timer.hpp"
59 #include "services/classLoadingService.hpp"
60 #include "services/threadService.hpp"
61 #include "utilities/array.hpp"
62 #include "utilities/globalDefinitions.hpp"
64 // We generally try to create the oops directly when parsing, rather than
65 // allocating temporary data structures and copying the bytes twice. A
66 // temporary area is only needed when parsing utf8 entries in the constant
67 // pool and when parsing line number tables.
69 // We add assert in debug mode when class format is not checked.
71 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
72 #define JAVA_MIN_SUPPORTED_VERSION 45
73 #define JAVA_MAX_SUPPORTED_VERSION 52
74 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
76 // Used for two backward compatibility reasons:
77 // - to check for new additions to the class file format in JDK1.5
78 // - to check for bug fixes in the format checker in JDK1.5
79 #define JAVA_1_5_VERSION 49
81 // Used for backward compatibility reasons:
82 // - to check for javac bug fixes that happened after 1.5
83 // - also used as the max version when running in jdk6
84 #define JAVA_6_VERSION 50
86 // Used for backward compatibility reasons:
87 // - to check NameAndType_info signatures more aggressively
88 #define JAVA_7_VERSION 51
90 // Extension method support.
91 #define JAVA_8_VERSION 52
93 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) {
94 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
95 // this function (_current can be allocated in a register, with scalar
96 // replacement of aggregates). The _current pointer is copied back to
97 // stream() when this function returns. DON'T call another method within
98 // this method that uses stream().
99 ClassFileStream* cfs0 = stream();
100 ClassFileStream cfs1 = *cfs0;
101 ClassFileStream* cfs = &cfs1;
102 #ifdef ASSERT
103 assert(cfs->allocated_on_stack(),"should be local");
104 u1* old_current = cfs0->current();
105 #endif
106 Handle class_loader(THREAD, _loader_data->class_loader());
108 // Used for batching symbol allocations.
109 const char* names[SymbolTable::symbol_alloc_batch_size];
110 int lengths[SymbolTable::symbol_alloc_batch_size];
111 int indices[SymbolTable::symbol_alloc_batch_size];
112 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
113 int names_count = 0;
115 // parsing Index 0 is unused
116 for (int index = 1; index < length; index++) {
117 // Each of the following case guarantees one more byte in the stream
118 // for the following tag or the access_flags following constant pool,
119 // so we don't need bounds-check for reading tag.
120 u1 tag = cfs->get_u1_fast();
121 switch (tag) {
122 case JVM_CONSTANT_Class :
123 {
124 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
125 u2 name_index = cfs->get_u2_fast();
126 _cp->klass_index_at_put(index, name_index);
127 }
128 break;
129 case JVM_CONSTANT_Fieldref :
130 {
131 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
132 u2 class_index = cfs->get_u2_fast();
133 u2 name_and_type_index = cfs->get_u2_fast();
134 _cp->field_at_put(index, class_index, name_and_type_index);
135 }
136 break;
137 case JVM_CONSTANT_Methodref :
138 {
139 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
140 u2 class_index = cfs->get_u2_fast();
141 u2 name_and_type_index = cfs->get_u2_fast();
142 _cp->method_at_put(index, class_index, name_and_type_index);
143 }
144 break;
145 case JVM_CONSTANT_InterfaceMethodref :
146 {
147 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
148 u2 class_index = cfs->get_u2_fast();
149 u2 name_and_type_index = cfs->get_u2_fast();
150 _cp->interface_method_at_put(index, class_index, name_and_type_index);
151 }
152 break;
153 case JVM_CONSTANT_String :
154 {
155 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
156 u2 string_index = cfs->get_u2_fast();
157 _cp->string_index_at_put(index, string_index);
158 }
159 break;
160 case JVM_CONSTANT_MethodHandle :
161 case JVM_CONSTANT_MethodType :
162 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
163 classfile_parse_error(
164 "Class file version does not support constant tag %u in class file %s",
165 tag, CHECK);
166 }
167 if (!EnableInvokeDynamic) {
168 classfile_parse_error(
169 "This JVM does not support constant tag %u in class file %s",
170 tag, CHECK);
171 }
172 if (tag == JVM_CONSTANT_MethodHandle) {
173 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
174 u1 ref_kind = cfs->get_u1_fast();
175 u2 method_index = cfs->get_u2_fast();
176 _cp->method_handle_index_at_put(index, ref_kind, method_index);
177 } else if (tag == JVM_CONSTANT_MethodType) {
178 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
179 u2 signature_index = cfs->get_u2_fast();
180 _cp->method_type_index_at_put(index, signature_index);
181 } else {
182 ShouldNotReachHere();
183 }
184 break;
185 case JVM_CONSTANT_InvokeDynamic :
186 {
187 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
188 classfile_parse_error(
189 "Class file version does not support constant tag %u in class file %s",
190 tag, CHECK);
191 }
192 if (!EnableInvokeDynamic) {
193 classfile_parse_error(
194 "This JVM does not support constant tag %u in class file %s",
195 tag, CHECK);
196 }
197 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
198 u2 bootstrap_specifier_index = cfs->get_u2_fast();
199 u2 name_and_type_index = cfs->get_u2_fast();
200 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
201 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
202 _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
203 }
204 break;
205 case JVM_CONSTANT_Integer :
206 {
207 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
208 u4 bytes = cfs->get_u4_fast();
209 _cp->int_at_put(index, (jint) bytes);
210 }
211 break;
212 case JVM_CONSTANT_Float :
213 {
214 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
215 u4 bytes = cfs->get_u4_fast();
216 _cp->float_at_put(index, *(jfloat*)&bytes);
217 }
218 break;
219 case JVM_CONSTANT_Long :
220 // A mangled type might cause you to overrun allocated memory
221 guarantee_property(index+1 < length,
222 "Invalid constant pool entry %u in class file %s",
223 index, CHECK);
224 {
225 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
226 u8 bytes = cfs->get_u8_fast();
227 _cp->long_at_put(index, bytes);
228 }
229 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
230 break;
231 case JVM_CONSTANT_Double :
232 // A mangled type might cause you to overrun allocated memory
233 guarantee_property(index+1 < length,
234 "Invalid constant pool entry %u in class file %s",
235 index, CHECK);
236 {
237 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
238 u8 bytes = cfs->get_u8_fast();
239 _cp->double_at_put(index, *(jdouble*)&bytes);
240 }
241 index++; // Skip entry following eigth-byte constant, see JVM book p. 98
242 break;
243 case JVM_CONSTANT_NameAndType :
244 {
245 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
246 u2 name_index = cfs->get_u2_fast();
247 u2 signature_index = cfs->get_u2_fast();
248 _cp->name_and_type_at_put(index, name_index, signature_index);
249 }
250 break;
251 case JVM_CONSTANT_Utf8 :
252 {
253 cfs->guarantee_more(2, CHECK); // utf8_length
254 u2 utf8_length = cfs->get_u2_fast();
255 u1* utf8_buffer = cfs->get_u1_buffer();
256 assert(utf8_buffer != NULL, "null utf8 buffer");
257 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
258 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
259 cfs->skip_u1_fast(utf8_length);
261 // Before storing the symbol, make sure it's legal
262 if (_need_verify) {
263 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
264 }
266 if (EnableInvokeDynamic && has_cp_patch_at(index)) {
267 Handle patch = clear_cp_patch_at(index);
268 guarantee_property(java_lang_String::is_instance(patch()),
269 "Illegal utf8 patch at %d in class file %s",
270 index, CHECK);
271 char* str = java_lang_String::as_utf8_string(patch());
272 // (could use java_lang_String::as_symbol instead, but might as well batch them)
273 utf8_buffer = (u1*) str;
274 utf8_length = (int) strlen(str);
275 }
277 unsigned int hash;
278 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
279 if (result == NULL) {
280 names[names_count] = (char*)utf8_buffer;
281 lengths[names_count] = utf8_length;
282 indices[names_count] = index;
283 hashValues[names_count++] = hash;
284 if (names_count == SymbolTable::symbol_alloc_batch_size) {
285 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
286 names_count = 0;
287 }
288 } else {
289 _cp->symbol_at_put(index, result);
290 }
291 }
292 break;
293 default:
294 classfile_parse_error(
295 "Unknown constant tag %u in class file %s", tag, CHECK);
296 break;
297 }
298 }
300 // Allocate the remaining symbols
301 if (names_count > 0) {
302 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
303 }
305 // Copy _current pointer of local copy back to stream().
306 #ifdef ASSERT
307 assert(cfs0->current() == old_current, "non-exclusive use of stream()");
308 #endif
309 cfs0->set_current(cfs1.current());
310 }
312 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
314 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) {
315 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8())
316 return cp->symbol_at(index);
317 else
318 return NULL;
319 }
321 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
322 ClassFileStream* cfs = stream();
323 constantPoolHandle nullHandle;
325 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
326 u2 length = cfs->get_u2_fast();
327 guarantee_property(
328 length >= 1, "Illegal constant pool size %u in class file %s",
329 length, CHECK_(nullHandle));
330 ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length,
331 CHECK_(nullHandle));
332 _cp = constant_pool; // save in case of errors
333 constantPoolHandle cp (THREAD, constant_pool);
335 // parsing constant pool entries
336 parse_constant_pool_entries(length, CHECK_(nullHandle));
338 int index = 1; // declared outside of loops for portability
340 // first verification pass - validate cross references and fixup class and string constants
341 for (index = 1; index < length; index++) { // Index 0 is unused
342 jbyte tag = cp->tag_at(index).value();
343 switch (tag) {
344 case JVM_CONSTANT_Class :
345 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
346 break;
347 case JVM_CONSTANT_Fieldref :
348 // fall through
349 case JVM_CONSTANT_Methodref :
350 // fall through
351 case JVM_CONSTANT_InterfaceMethodref : {
352 if (!_need_verify) break;
353 int klass_ref_index = cp->klass_ref_index_at(index);
354 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
355 check_property(valid_klass_reference_at(klass_ref_index),
356 "Invalid constant pool index %u in class file %s",
357 klass_ref_index,
358 CHECK_(nullHandle));
359 check_property(valid_cp_range(name_and_type_ref_index, length) &&
360 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
361 "Invalid constant pool index %u in class file %s",
362 name_and_type_ref_index,
363 CHECK_(nullHandle));
364 break;
365 }
366 case JVM_CONSTANT_String :
367 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
368 break;
369 case JVM_CONSTANT_Integer :
370 break;
371 case JVM_CONSTANT_Float :
372 break;
373 case JVM_CONSTANT_Long :
374 case JVM_CONSTANT_Double :
375 index++;
376 check_property(
377 (index < length && cp->tag_at(index).is_invalid()),
378 "Improper constant pool long/double index %u in class file %s",
379 index, CHECK_(nullHandle));
380 break;
381 case JVM_CONSTANT_NameAndType : {
382 if (!_need_verify) break;
383 int name_ref_index = cp->name_ref_index_at(index);
384 int signature_ref_index = cp->signature_ref_index_at(index);
385 check_property(valid_symbol_at(name_ref_index),
386 "Invalid constant pool index %u in class file %s",
387 name_ref_index, CHECK_(nullHandle));
388 check_property(valid_symbol_at(signature_ref_index),
389 "Invalid constant pool index %u in class file %s",
390 signature_ref_index, CHECK_(nullHandle));
391 break;
392 }
393 case JVM_CONSTANT_Utf8 :
394 break;
395 case JVM_CONSTANT_UnresolvedClass : // fall-through
396 case JVM_CONSTANT_UnresolvedClassInError:
397 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
398 break;
399 case JVM_CONSTANT_ClassIndex :
400 {
401 int class_index = cp->klass_index_at(index);
402 check_property(valid_symbol_at(class_index),
403 "Invalid constant pool index %u in class file %s",
404 class_index, CHECK_(nullHandle));
405 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
406 }
407 break;
408 case JVM_CONSTANT_StringIndex :
409 {
410 int string_index = cp->string_index_at(index);
411 check_property(valid_symbol_at(string_index),
412 "Invalid constant pool index %u in class file %s",
413 string_index, CHECK_(nullHandle));
414 Symbol* sym = cp->symbol_at(string_index);
415 cp->unresolved_string_at_put(index, sym);
416 }
417 break;
418 case JVM_CONSTANT_MethodHandle :
419 {
420 int ref_index = cp->method_handle_index_at(index);
421 check_property(
422 valid_cp_range(ref_index, length) &&
423 EnableInvokeDynamic,
424 "Invalid constant pool index %u in class file %s",
425 ref_index, CHECK_(nullHandle));
426 constantTag tag = cp->tag_at(ref_index);
427 int ref_kind = cp->method_handle_ref_kind_at(index);
428 switch (ref_kind) {
429 case JVM_REF_getField:
430 case JVM_REF_getStatic:
431 case JVM_REF_putField:
432 case JVM_REF_putStatic:
433 check_property(
434 tag.is_field(),
435 "Invalid constant pool index %u in class file %s (not a field)",
436 ref_index, CHECK_(nullHandle));
437 break;
438 case JVM_REF_invokeVirtual:
439 case JVM_REF_newInvokeSpecial:
440 check_property(
441 tag.is_method(),
442 "Invalid constant pool index %u in class file %s (not a method)",
443 ref_index, CHECK_(nullHandle));
444 break;
445 case JVM_REF_invokeStatic:
446 case JVM_REF_invokeSpecial:
447 check_property(tag.is_method() ||
448 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
449 "Invalid constant pool index %u in class file %s (not a method)",
450 ref_index, CHECK_(nullHandle));
451 break;
452 case JVM_REF_invokeInterface:
453 check_property(
454 tag.is_interface_method(),
455 "Invalid constant pool index %u in class file %s (not an interface method)",
456 ref_index, CHECK_(nullHandle));
457 break;
458 default:
459 classfile_parse_error(
460 "Bad method handle kind at constant pool index %u in class file %s",
461 index, CHECK_(nullHandle));
462 }
463 // Keep the ref_index unchanged. It will be indirected at link-time.
464 }
465 break;
466 case JVM_CONSTANT_MethodType :
467 {
468 int ref_index = cp->method_type_index_at(index);
469 check_property(valid_symbol_at(ref_index) && EnableInvokeDynamic,
470 "Invalid constant pool index %u in class file %s",
471 ref_index, CHECK_(nullHandle));
472 }
473 break;
474 case JVM_CONSTANT_InvokeDynamic :
475 {
476 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
477 check_property(valid_cp_range(name_and_type_ref_index, length) &&
478 cp->tag_at(name_and_type_ref_index).is_name_and_type(),
479 "Invalid constant pool index %u in class file %s",
480 name_and_type_ref_index,
481 CHECK_(nullHandle));
482 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
483 break;
484 }
485 default:
486 fatal(err_msg("bad constant pool tag value %u",
487 cp->tag_at(index).value()));
488 ShouldNotReachHere();
489 break;
490 } // end of switch
491 } // end of for
493 if (_cp_patches != NULL) {
494 // need to treat this_class specially...
495 assert(EnableInvokeDynamic, "");
496 int this_class_index;
497 {
498 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
499 u1* mark = cfs->current();
500 u2 flags = cfs->get_u2_fast();
501 this_class_index = cfs->get_u2_fast();
502 cfs->set_current(mark); // revert to mark
503 }
505 for (index = 1; index < length; index++) { // Index 0 is unused
506 if (has_cp_patch_at(index)) {
507 guarantee_property(index != this_class_index,
508 "Illegal constant pool patch to self at %d in class file %s",
509 index, CHECK_(nullHandle));
510 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
511 }
512 }
513 }
515 if (!_need_verify) {
516 return cp;
517 }
519 // second verification pass - checks the strings are of the right format.
520 // but not yet to the other entries
521 for (index = 1; index < length; index++) {
522 jbyte tag = cp->tag_at(index).value();
523 switch (tag) {
524 case JVM_CONSTANT_UnresolvedClass: {
525 Symbol* class_name = cp->unresolved_klass_at(index);
526 // check the name, even if _cp_patches will overwrite it
527 verify_legal_class_name(class_name, CHECK_(nullHandle));
528 break;
529 }
530 case JVM_CONSTANT_NameAndType: {
531 if (_need_verify && _major_version >= JAVA_7_VERSION) {
532 int sig_index = cp->signature_ref_index_at(index);
533 int name_index = cp->name_ref_index_at(index);
534 Symbol* name = cp->symbol_at(name_index);
535 Symbol* sig = cp->symbol_at(sig_index);
536 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
537 verify_legal_method_signature(name, sig, CHECK_(nullHandle));
538 } else {
539 verify_legal_field_signature(name, sig, CHECK_(nullHandle));
540 }
541 }
542 break;
543 }
544 case JVM_CONSTANT_InvokeDynamic:
545 case JVM_CONSTANT_Fieldref:
546 case JVM_CONSTANT_Methodref:
547 case JVM_CONSTANT_InterfaceMethodref: {
548 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
549 // already verified to be utf8
550 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
551 // already verified to be utf8
552 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
553 Symbol* name = cp->symbol_at(name_ref_index);
554 Symbol* signature = cp->symbol_at(signature_ref_index);
555 if (tag == JVM_CONSTANT_Fieldref) {
556 verify_legal_field_name(name, CHECK_(nullHandle));
557 if (_need_verify && _major_version >= JAVA_7_VERSION) {
558 // Signature is verified above, when iterating NameAndType_info.
559 // Need only to be sure it's the right type.
560 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
561 throwIllegalSignature(
562 "Field", name, signature, CHECK_(nullHandle));
563 }
564 } else {
565 verify_legal_field_signature(name, signature, CHECK_(nullHandle));
566 }
567 } else {
568 verify_legal_method_name(name, CHECK_(nullHandle));
569 if (_need_verify && _major_version >= JAVA_7_VERSION) {
570 // Signature is verified above, when iterating NameAndType_info.
571 // Need only to be sure it's the right type.
572 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
573 throwIllegalSignature(
574 "Method", name, signature, CHECK_(nullHandle));
575 }
576 } else {
577 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
578 }
579 if (tag == JVM_CONSTANT_Methodref) {
580 // 4509014: If a class method name begins with '<', it must be "<init>".
581 assert(name != NULL, "method name in constant pool is null");
582 unsigned int name_len = name->utf8_length();
583 assert(name_len > 0, "bad method name"); // already verified as legal name
584 if (name->byte_at(0) == '<') {
585 if (name != vmSymbols::object_initializer_name()) {
586 classfile_parse_error(
587 "Bad method name at constant pool index %u in class file %s",
588 name_ref_index, CHECK_(nullHandle));
589 }
590 }
591 }
592 }
593 break;
594 }
595 case JVM_CONSTANT_MethodHandle: {
596 int ref_index = cp->method_handle_index_at(index);
597 int ref_kind = cp->method_handle_ref_kind_at(index);
598 switch (ref_kind) {
599 case JVM_REF_invokeVirtual:
600 case JVM_REF_invokeStatic:
601 case JVM_REF_invokeSpecial:
602 case JVM_REF_newInvokeSpecial:
603 {
604 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
605 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
606 Symbol* name = cp->symbol_at(name_ref_index);
607 if (ref_kind == JVM_REF_newInvokeSpecial) {
608 if (name != vmSymbols::object_initializer_name()) {
609 classfile_parse_error(
610 "Bad constructor name at constant pool index %u in class file %s",
611 name_ref_index, CHECK_(nullHandle));
612 }
613 } else {
614 if (name == vmSymbols::object_initializer_name()) {
615 classfile_parse_error(
616 "Bad method name at constant pool index %u in class file %s",
617 name_ref_index, CHECK_(nullHandle));
618 }
619 }
620 }
621 break;
622 // Other ref_kinds are already fully checked in previous pass.
623 }
624 break;
625 }
626 case JVM_CONSTANT_MethodType: {
627 Symbol* no_name = vmSymbols::type_name(); // place holder
628 Symbol* signature = cp->method_type_signature_at(index);
629 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
630 break;
631 }
632 case JVM_CONSTANT_Utf8: {
633 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
634 }
635 } // end of switch
636 } // end of for
638 return cp;
639 }
642 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
643 assert(EnableInvokeDynamic, "");
644 BasicType patch_type = T_VOID;
646 switch (cp->tag_at(index).value()) {
648 case JVM_CONSTANT_UnresolvedClass :
649 // Patching a class means pre-resolving it.
650 // The name in the constant pool is ignored.
651 if (java_lang_Class::is_instance(patch())) {
652 guarantee_property(!java_lang_Class::is_primitive(patch()),
653 "Illegal class patch at %d in class file %s",
654 index, CHECK);
655 cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
656 } else {
657 guarantee_property(java_lang_String::is_instance(patch()),
658 "Illegal class patch at %d in class file %s",
659 index, CHECK);
660 Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
661 cp->unresolved_klass_at_put(index, name);
662 }
663 break;
665 case JVM_CONSTANT_String :
666 // skip this patch and don't clear it. Needs the oop array for resolved
667 // references to be created first.
668 return;
670 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
671 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
672 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
673 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
674 patch_prim:
675 {
676 jvalue value;
677 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
678 guarantee_property(value_type == patch_type,
679 "Illegal primitive patch at %d in class file %s",
680 index, CHECK);
681 switch (value_type) {
682 case T_INT: cp->int_at_put(index, value.i); break;
683 case T_FLOAT: cp->float_at_put(index, value.f); break;
684 case T_LONG: cp->long_at_put(index, value.j); break;
685 case T_DOUBLE: cp->double_at_put(index, value.d); break;
686 default: assert(false, "");
687 }
688 }
689 break;
691 default:
692 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
693 guarantee_property(!has_cp_patch_at(index),
694 "Illegal unexpected patch at %d in class file %s",
695 index, CHECK);
696 return;
697 }
699 // On fall-through, mark the patch as used.
700 clear_cp_patch_at(index);
701 }
705 class NameSigHash: public ResourceObj {
706 public:
707 Symbol* _name; // name
708 Symbol* _sig; // signature
709 NameSigHash* _next; // Next entry in hash table
710 };
713 #define HASH_ROW_SIZE 256
715 unsigned int hash(Symbol* name, Symbol* sig) {
716 unsigned int raw_hash = 0;
717 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
718 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
720 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
721 }
724 void initialize_hashtable(NameSigHash** table) {
725 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
726 }
728 // Return false if the name/sig combination is found in table.
729 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
730 // The old format checker uses heap sort to find duplicates.
731 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
732 // of table since we don't expect Symbol*'s to move.
733 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
734 assert(name != NULL, "name in constant pool is NULL");
736 // First lookup for duplicates
737 int index = hash(name, sig);
738 NameSigHash* entry = table[index];
739 while (entry != NULL) {
740 if (entry->_name == name && entry->_sig == sig) {
741 return false;
742 }
743 entry = entry->_next;
744 }
746 // No duplicate is found, allocate a new entry and fill it.
747 entry = new NameSigHash();
748 entry->_name = name;
749 entry->_sig = sig;
751 // Insert into hash table
752 entry->_next = table[index];
753 table[index] = entry;
755 return true;
756 }
759 Array<Klass*>* ClassFileParser::parse_interfaces(int length,
760 Handle protection_domain,
761 Symbol* class_name,
762 bool* has_default_methods,
763 TRAPS) {
764 if (length == 0) {
765 _local_interfaces = Universe::the_empty_klass_array();
766 } else {
767 ClassFileStream* cfs = stream();
768 assert(length > 0, "only called for length>0");
769 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL);
771 int index;
772 for (index = 0; index < length; index++) {
773 u2 interface_index = cfs->get_u2(CHECK_NULL);
774 KlassHandle interf;
775 check_property(
776 valid_klass_reference_at(interface_index),
777 "Interface name has bad constant pool index %u in class file %s",
778 interface_index, CHECK_NULL);
779 if (_cp->tag_at(interface_index).is_klass()) {
780 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index));
781 } else {
782 Symbol* unresolved_klass = _cp->klass_name_at(interface_index);
784 // Don't need to check legal name because it's checked when parsing constant pool.
785 // But need to make sure it's not an array type.
786 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
787 "Bad interface name in class file %s", CHECK_NULL);
788 Handle class_loader(THREAD, _loader_data->class_loader());
790 // Call resolve_super so classcircularity is checked
791 Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
792 unresolved_klass, class_loader, protection_domain,
793 false, CHECK_NULL);
794 interf = KlassHandle(THREAD, k);
795 }
797 if (!interf()->is_interface()) {
798 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
799 }
800 if (InstanceKlass::cast(interf())->has_default_methods()) {
801 *has_default_methods = true;
802 }
803 _local_interfaces->at_put(index, interf());
804 }
806 if (!_need_verify || length <= 1) {
807 return _local_interfaces;
808 }
810 // Check if there's any duplicates in interfaces
811 ResourceMark rm(THREAD);
812 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
813 THREAD, NameSigHash*, HASH_ROW_SIZE);
814 initialize_hashtable(interface_names);
815 bool dup = false;
816 {
817 debug_only(No_Safepoint_Verifier nsv;)
818 for (index = 0; index < length; index++) {
819 Klass* k = _local_interfaces->at(index);
820 Symbol* name = InstanceKlass::cast(k)->name();
821 // If no duplicates, add (name, NULL) in hashtable interface_names.
822 if (!put_after_lookup(name, NULL, interface_names)) {
823 dup = true;
824 break;
825 }
826 }
827 }
828 if (dup) {
829 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL);
830 }
831 }
832 return _local_interfaces;
833 }
836 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) {
837 // Make sure the constant pool entry is of a type appropriate to this field
838 guarantee_property(
839 (constantvalue_index > 0 &&
840 constantvalue_index < _cp->length()),
841 "Bad initial value index %u in ConstantValue attribute in class file %s",
842 constantvalue_index, CHECK);
843 constantTag value_type = _cp->tag_at(constantvalue_index);
844 switch ( _cp->basic_type_for_signature_at(signature_index) ) {
845 case T_LONG:
846 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
847 break;
848 case T_FLOAT:
849 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
850 break;
851 case T_DOUBLE:
852 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
853 break;
854 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
855 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
856 break;
857 case T_OBJECT:
858 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
859 && value_type.is_string()),
860 "Bad string initial value in class file %s", CHECK);
861 break;
862 default:
863 classfile_parse_error(
864 "Unable to set initial value %u in class file %s",
865 constantvalue_index, CHECK);
866 }
867 }
870 // Parse attributes for a field.
871 void ClassFileParser::parse_field_attributes(u2 attributes_count,
872 bool is_static, u2 signature_index,
873 u2* constantvalue_index_addr,
874 bool* is_synthetic_addr,
875 u2* generic_signature_index_addr,
876 ClassFileParser::FieldAnnotationCollector* parsed_annotations,
877 TRAPS) {
878 ClassFileStream* cfs = stream();
879 assert(attributes_count > 0, "length should be greater than 0");
880 u2 constantvalue_index = 0;
881 u2 generic_signature_index = 0;
882 bool is_synthetic = false;
883 u1* runtime_visible_annotations = NULL;
884 int runtime_visible_annotations_length = 0;
885 u1* runtime_invisible_annotations = NULL;
886 int runtime_invisible_annotations_length = 0;
887 u1* runtime_visible_type_annotations = NULL;
888 int runtime_visible_type_annotations_length = 0;
889 u1* runtime_invisible_type_annotations = NULL;
890 int runtime_invisible_type_annotations_length = 0;
891 bool runtime_invisible_type_annotations_exists = false;
892 while (attributes_count--) {
893 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
894 u2 attribute_name_index = cfs->get_u2_fast();
895 u4 attribute_length = cfs->get_u4_fast();
896 check_property(valid_symbol_at(attribute_name_index),
897 "Invalid field attribute index %u in class file %s",
898 attribute_name_index,
899 CHECK);
900 Symbol* attribute_name = _cp->symbol_at(attribute_name_index);
901 if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
902 // ignore if non-static
903 if (constantvalue_index != 0) {
904 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
905 }
906 check_property(
907 attribute_length == 2,
908 "Invalid ConstantValue field attribute length %u in class file %s",
909 attribute_length, CHECK);
910 constantvalue_index = cfs->get_u2(CHECK);
911 if (_need_verify) {
912 verify_constantvalue(constantvalue_index, signature_index, CHECK);
913 }
914 } else if (attribute_name == vmSymbols::tag_synthetic()) {
915 if (attribute_length != 0) {
916 classfile_parse_error(
917 "Invalid Synthetic field attribute length %u in class file %s",
918 attribute_length, CHECK);
919 }
920 is_synthetic = true;
921 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
922 if (attribute_length != 0) {
923 classfile_parse_error(
924 "Invalid Deprecated field attribute length %u in class file %s",
925 attribute_length, CHECK);
926 }
927 } else if (_major_version >= JAVA_1_5_VERSION) {
928 if (attribute_name == vmSymbols::tag_signature()) {
929 if (attribute_length != 2) {
930 classfile_parse_error(
931 "Wrong size %u for field's Signature attribute in class file %s",
932 attribute_length, CHECK);
933 }
934 generic_signature_index = parse_generic_signature_attribute(CHECK);
935 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
936 runtime_visible_annotations_length = attribute_length;
937 runtime_visible_annotations = cfs->get_u1_buffer();
938 assert(runtime_visible_annotations != NULL, "null visible annotations");
939 parse_annotations(runtime_visible_annotations,
940 runtime_visible_annotations_length,
941 parsed_annotations,
942 CHECK);
943 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
944 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
945 runtime_invisible_annotations_length = attribute_length;
946 runtime_invisible_annotations = cfs->get_u1_buffer();
947 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
948 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
949 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
950 if (runtime_visible_type_annotations != NULL) {
951 classfile_parse_error(
952 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
953 }
954 runtime_visible_type_annotations_length = attribute_length;
955 runtime_visible_type_annotations = cfs->get_u1_buffer();
956 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
957 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
958 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
959 if (runtime_invisible_type_annotations_exists) {
960 classfile_parse_error(
961 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
962 } else {
963 runtime_invisible_type_annotations_exists = true;
964 }
965 if (PreserveAllAnnotations) {
966 runtime_invisible_type_annotations_length = attribute_length;
967 runtime_invisible_type_annotations = cfs->get_u1_buffer();
968 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
969 }
970 cfs->skip_u1(attribute_length, CHECK);
971 } else {
972 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
973 }
974 } else {
975 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
976 }
977 }
979 *constantvalue_index_addr = constantvalue_index;
980 *is_synthetic_addr = is_synthetic;
981 *generic_signature_index_addr = generic_signature_index;
982 AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
983 runtime_visible_annotations_length,
984 runtime_invisible_annotations,
985 runtime_invisible_annotations_length,
986 CHECK);
987 parsed_annotations->set_field_annotations(a);
988 a = assemble_annotations(runtime_visible_type_annotations,
989 runtime_visible_type_annotations_length,
990 runtime_invisible_type_annotations,
991 runtime_invisible_type_annotations_length,
992 CHECK);
993 parsed_annotations->set_field_type_annotations(a);
994 return;
995 }
998 // Field allocation types. Used for computing field offsets.
1000 enum FieldAllocationType {
1001 STATIC_OOP, // Oops
1002 STATIC_BYTE, // Boolean, Byte, char
1003 STATIC_SHORT, // shorts
1004 STATIC_WORD, // ints
1005 STATIC_DOUBLE, // aligned long or double
1006 NONSTATIC_OOP,
1007 NONSTATIC_BYTE,
1008 NONSTATIC_SHORT,
1009 NONSTATIC_WORD,
1010 NONSTATIC_DOUBLE,
1011 MAX_FIELD_ALLOCATION_TYPE,
1012 BAD_ALLOCATION_TYPE = -1
1013 };
1015 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1016 BAD_ALLOCATION_TYPE, // 0
1017 BAD_ALLOCATION_TYPE, // 1
1018 BAD_ALLOCATION_TYPE, // 2
1019 BAD_ALLOCATION_TYPE, // 3
1020 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1021 NONSTATIC_SHORT, // T_CHAR = 5,
1022 NONSTATIC_WORD, // T_FLOAT = 6,
1023 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1024 NONSTATIC_BYTE, // T_BYTE = 8,
1025 NONSTATIC_SHORT, // T_SHORT = 9,
1026 NONSTATIC_WORD, // T_INT = 10,
1027 NONSTATIC_DOUBLE, // T_LONG = 11,
1028 NONSTATIC_OOP, // T_OBJECT = 12,
1029 NONSTATIC_OOP, // T_ARRAY = 13,
1030 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1031 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1032 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1033 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1034 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1035 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1036 BAD_ALLOCATION_TYPE, // 0
1037 BAD_ALLOCATION_TYPE, // 1
1038 BAD_ALLOCATION_TYPE, // 2
1039 BAD_ALLOCATION_TYPE, // 3
1040 STATIC_BYTE , // T_BOOLEAN = 4,
1041 STATIC_SHORT, // T_CHAR = 5,
1042 STATIC_WORD, // T_FLOAT = 6,
1043 STATIC_DOUBLE, // T_DOUBLE = 7,
1044 STATIC_BYTE, // T_BYTE = 8,
1045 STATIC_SHORT, // T_SHORT = 9,
1046 STATIC_WORD, // T_INT = 10,
1047 STATIC_DOUBLE, // T_LONG = 11,
1048 STATIC_OOP, // T_OBJECT = 12,
1049 STATIC_OOP, // T_ARRAY = 13,
1050 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1051 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1052 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1053 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1054 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1055 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1056 };
1058 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1059 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1060 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1061 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1062 return result;
1063 }
1065 class FieldAllocationCount: public ResourceObj {
1066 public:
1067 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1069 FieldAllocationCount() {
1070 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1071 count[i] = 0;
1072 }
1073 }
1075 FieldAllocationType update(bool is_static, BasicType type) {
1076 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1077 // Make sure there is no overflow with injected fields.
1078 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1079 count[atype]++;
1080 return atype;
1081 }
1082 };
1084 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name,
1085 bool is_interface,
1086 FieldAllocationCount *fac,
1087 u2* java_fields_count_ptr, TRAPS) {
1088 ClassFileStream* cfs = stream();
1089 cfs->guarantee_more(2, CHECK_NULL); // length
1090 u2 length = cfs->get_u2_fast();
1091 *java_fields_count_ptr = length;
1093 int num_injected = 0;
1094 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1095 int total_fields = length + num_injected;
1097 // The field array starts with tuples of shorts
1098 // [access, name index, sig index, initial value index, byte offset].
1099 // A generic signature slot only exists for field with generic
1100 // signature attribute. And the access flag is set with
1101 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1102 // signature slots are at the end of the field array and after all
1103 // other fields data.
1104 //
1105 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1106 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1107 // ...
1108 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1109 // [generic signature index]
1110 // [generic signature index]
1111 // ...
1112 //
1113 // Allocate a temporary resource array for field data. For each field,
1114 // a slot is reserved in the temporary array for the generic signature
1115 // index. After parsing all fields, the data are copied to a permanent
1116 // array and any unused slots will be discarded.
1117 ResourceMark rm(THREAD);
1118 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1119 THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1121 // The generic signature slots start after all other fields' data.
1122 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1123 int num_generic_signature = 0;
1124 for (int n = 0; n < length; n++) {
1125 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count
1127 AccessFlags access_flags;
1128 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1129 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1130 access_flags.set_flags(flags);
1132 u2 name_index = cfs->get_u2_fast();
1133 int cp_size = _cp->length();
1134 check_property(valid_symbol_at(name_index),
1135 "Invalid constant pool index %u for field name in class file %s",
1136 name_index,
1137 CHECK_NULL);
1138 Symbol* name = _cp->symbol_at(name_index);
1139 verify_legal_field_name(name, CHECK_NULL);
1141 u2 signature_index = cfs->get_u2_fast();
1142 check_property(valid_symbol_at(signature_index),
1143 "Invalid constant pool index %u for field signature in class file %s",
1144 signature_index, CHECK_NULL);
1145 Symbol* sig = _cp->symbol_at(signature_index);
1146 verify_legal_field_signature(name, sig, CHECK_NULL);
1148 u2 constantvalue_index = 0;
1149 bool is_synthetic = false;
1150 u2 generic_signature_index = 0;
1151 bool is_static = access_flags.is_static();
1152 FieldAnnotationCollector parsed_annotations(_loader_data);
1154 u2 attributes_count = cfs->get_u2_fast();
1155 if (attributes_count > 0) {
1156 parse_field_attributes(attributes_count, is_static, signature_index,
1157 &constantvalue_index, &is_synthetic,
1158 &generic_signature_index, &parsed_annotations,
1159 CHECK_NULL);
1160 if (parsed_annotations.field_annotations() != NULL) {
1161 if (_fields_annotations == NULL) {
1162 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1163 _loader_data, length, NULL,
1164 CHECK_NULL);
1165 }
1166 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1167 parsed_annotations.set_field_annotations(NULL);
1168 }
1169 if (parsed_annotations.field_type_annotations() != NULL) {
1170 if (_fields_type_annotations == NULL) {
1171 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1172 _loader_data, length, NULL,
1173 CHECK_NULL);
1174 }
1175 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1176 parsed_annotations.set_field_type_annotations(NULL);
1177 }
1179 if (is_synthetic) {
1180 access_flags.set_is_synthetic();
1181 }
1182 if (generic_signature_index != 0) {
1183 access_flags.set_field_has_generic_signature();
1184 fa[generic_signature_slot] = generic_signature_index;
1185 generic_signature_slot ++;
1186 num_generic_signature ++;
1187 }
1188 }
1190 FieldInfo* field = FieldInfo::from_field_array(fa, n);
1191 field->initialize(access_flags.as_short(),
1192 name_index,
1193 signature_index,
1194 constantvalue_index);
1195 BasicType type = _cp->basic_type_for_signature_at(signature_index);
1197 // Remember how many oops we encountered and compute allocation type
1198 FieldAllocationType atype = fac->update(is_static, type);
1199 field->set_allocation_type(atype);
1201 // After field is initialized with type, we can augment it with aux info
1202 if (parsed_annotations.has_any_annotations())
1203 parsed_annotations.apply_to(field);
1204 }
1206 int index = length;
1207 if (num_injected != 0) {
1208 for (int n = 0; n < num_injected; n++) {
1209 // Check for duplicates
1210 if (injected[n].may_be_java) {
1211 Symbol* name = injected[n].name();
1212 Symbol* signature = injected[n].signature();
1213 bool duplicate = false;
1214 for (int i = 0; i < length; i++) {
1215 FieldInfo* f = FieldInfo::from_field_array(fa, i);
1216 if (name == _cp->symbol_at(f->name_index()) &&
1217 signature == _cp->symbol_at(f->signature_index())) {
1218 // Symbol is desclared in Java so skip this one
1219 duplicate = true;
1220 break;
1221 }
1222 }
1223 if (duplicate) {
1224 // These will be removed from the field array at the end
1225 continue;
1226 }
1227 }
1229 // Injected field
1230 FieldInfo* field = FieldInfo::from_field_array(fa, index);
1231 field->initialize(JVM_ACC_FIELD_INTERNAL,
1232 injected[n].name_index,
1233 injected[n].signature_index,
1234 0);
1236 BasicType type = FieldType::basic_type(injected[n].signature());
1238 // Remember how many oops we encountered and compute allocation type
1239 FieldAllocationType atype = fac->update(false, type);
1240 field->set_allocation_type(atype);
1241 index++;
1242 }
1243 }
1245 // Now copy the fields' data from the temporary resource array.
1246 // Sometimes injected fields already exist in the Java source so
1247 // the fields array could be too long. In that case the
1248 // fields array is trimed. Also unused slots that were reserved
1249 // for generic signature indexes are discarded.
1250 Array<u2>* fields = MetadataFactory::new_array<u2>(
1251 _loader_data, index * FieldInfo::field_slots + num_generic_signature,
1252 CHECK_NULL);
1253 _fields = fields; // save in case of error
1254 {
1255 int i = 0;
1256 for (; i < index * FieldInfo::field_slots; i++) {
1257 fields->at_put(i, fa[i]);
1258 }
1259 for (int j = total_fields * FieldInfo::field_slots;
1260 j < generic_signature_slot; j++) {
1261 fields->at_put(i++, fa[j]);
1262 }
1263 assert(i == fields->length(), "");
1264 }
1266 if (_need_verify && length > 1) {
1267 // Check duplicated fields
1268 ResourceMark rm(THREAD);
1269 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1270 THREAD, NameSigHash*, HASH_ROW_SIZE);
1271 initialize_hashtable(names_and_sigs);
1272 bool dup = false;
1273 {
1274 debug_only(No_Safepoint_Verifier nsv;)
1275 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) {
1276 Symbol* name = fs.name();
1277 Symbol* sig = fs.signature();
1278 // If no duplicates, add name/signature in hashtable names_and_sigs.
1279 if (!put_after_lookup(name, sig, names_and_sigs)) {
1280 dup = true;
1281 break;
1282 }
1283 }
1284 }
1285 if (dup) {
1286 classfile_parse_error("Duplicate field name&signature in class file %s",
1287 CHECK_NULL);
1288 }
1289 }
1291 return fields;
1292 }
1295 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1296 while (length-- > 0) {
1297 *dest++ = Bytes::get_Java_u2((u1*) (src++));
1298 }
1299 }
1302 u2* ClassFileParser::parse_exception_table(u4 code_length,
1303 u4 exception_table_length,
1304 TRAPS) {
1305 ClassFileStream* cfs = stream();
1307 u2* exception_table_start = cfs->get_u2_buffer();
1308 assert(exception_table_start != NULL, "null exception table");
1309 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1310 // Will check legal target after parsing code array in verifier.
1311 if (_need_verify) {
1312 for (unsigned int i = 0; i < exception_table_length; i++) {
1313 u2 start_pc = cfs->get_u2_fast();
1314 u2 end_pc = cfs->get_u2_fast();
1315 u2 handler_pc = cfs->get_u2_fast();
1316 u2 catch_type_index = cfs->get_u2_fast();
1317 guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1318 "Illegal exception table range in class file %s",
1319 CHECK_NULL);
1320 guarantee_property(handler_pc < code_length,
1321 "Illegal exception table handler in class file %s",
1322 CHECK_NULL);
1323 if (catch_type_index != 0) {
1324 guarantee_property(valid_klass_reference_at(catch_type_index),
1325 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1326 }
1327 }
1328 } else {
1329 cfs->skip_u2_fast(exception_table_length * 4);
1330 }
1331 return exception_table_start;
1332 }
1334 void ClassFileParser::parse_linenumber_table(
1335 u4 code_attribute_length, u4 code_length,
1336 CompressedLineNumberWriteStream** write_stream, TRAPS) {
1337 ClassFileStream* cfs = stream();
1338 unsigned int num_entries = cfs->get_u2(CHECK);
1340 // Each entry is a u2 start_pc, and a u2 line_number
1341 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1343 // Verify line number attribute and table length
1344 check_property(
1345 code_attribute_length == sizeof(u2) + length_in_bytes,
1346 "LineNumberTable attribute has wrong length in class file %s", CHECK);
1348 cfs->guarantee_more(length_in_bytes, CHECK);
1350 if ((*write_stream) == NULL) {
1351 if (length_in_bytes > fixed_buffer_size) {
1352 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1353 } else {
1354 (*write_stream) = new CompressedLineNumberWriteStream(
1355 linenumbertable_buffer, fixed_buffer_size);
1356 }
1357 }
1359 while (num_entries-- > 0) {
1360 u2 bci = cfs->get_u2_fast(); // start_pc
1361 u2 line = cfs->get_u2_fast(); // line_number
1362 guarantee_property(bci < code_length,
1363 "Invalid pc in LineNumberTable in class file %s", CHECK);
1364 (*write_stream)->write_pair(bci, line);
1365 }
1366 }
1369 // Class file LocalVariableTable elements.
1370 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1371 public:
1372 u2 start_bci;
1373 u2 length;
1374 u2 name_cp_index;
1375 u2 descriptor_cp_index;
1376 u2 slot;
1377 };
1380 class LVT_Hash: public CHeapObj<mtClass> {
1381 public:
1382 LocalVariableTableElement *_elem; // element
1383 LVT_Hash* _next; // Next entry in hash table
1384 };
1386 unsigned int hash(LocalVariableTableElement *elem) {
1387 unsigned int raw_hash = elem->start_bci;
1389 raw_hash = elem->length + raw_hash * 37;
1390 raw_hash = elem->name_cp_index + raw_hash * 37;
1391 raw_hash = elem->slot + raw_hash * 37;
1393 return raw_hash % HASH_ROW_SIZE;
1394 }
1396 void initialize_hashtable(LVT_Hash** table) {
1397 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1398 table[i] = NULL;
1399 }
1400 }
1402 void clear_hashtable(LVT_Hash** table) {
1403 for (int i = 0; i < HASH_ROW_SIZE; i++) {
1404 LVT_Hash* current = table[i];
1405 LVT_Hash* next;
1406 while (current != NULL) {
1407 next = current->_next;
1408 current->_next = NULL;
1409 delete(current);
1410 current = next;
1411 }
1412 table[i] = NULL;
1413 }
1414 }
1416 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1417 LVT_Hash* entry = table[index];
1419 /*
1420 * 3-tuple start_bci/length/slot has to be unique key,
1421 * so the following comparison seems to be redundant:
1422 * && elem->name_cp_index == entry->_elem->name_cp_index
1423 */
1424 while (entry != NULL) {
1425 if (elem->start_bci == entry->_elem->start_bci
1426 && elem->length == entry->_elem->length
1427 && elem->name_cp_index == entry->_elem->name_cp_index
1428 && elem->slot == entry->_elem->slot
1429 ) {
1430 return entry;
1431 }
1432 entry = entry->_next;
1433 }
1434 return NULL;
1435 }
1437 // Return false if the local variable is found in table.
1438 // Return true if no duplicate is found.
1439 // And local variable is added as a new entry in table.
1440 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1441 // First lookup for duplicates
1442 int index = hash(elem);
1443 LVT_Hash* entry = LVT_lookup(elem, index, table);
1445 if (entry != NULL) {
1446 return false;
1447 }
1448 // No duplicate is found, allocate a new entry and fill it.
1449 if ((entry = new LVT_Hash()) == NULL) {
1450 return false;
1451 }
1452 entry->_elem = elem;
1454 // Insert into hash table
1455 entry->_next = table[index];
1456 table[index] = entry;
1458 return true;
1459 }
1461 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1462 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
1463 lvt->length = Bytes::get_Java_u2((u1*) &src->length);
1464 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1465 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1466 lvt->signature_cp_index = 0;
1467 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
1468 }
1470 // Function is used to parse both attributes:
1471 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1472 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1473 u2 max_locals,
1474 u4 code_attribute_length,
1475 u2* localvariable_table_length,
1476 bool isLVTT,
1477 TRAPS) {
1478 ClassFileStream* cfs = stream();
1479 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1480 *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1481 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1482 // Verify local variable table attribute has right length
1483 if (_need_verify) {
1484 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1485 "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1486 }
1487 u2* localvariable_table_start = cfs->get_u2_buffer();
1488 assert(localvariable_table_start != NULL, "null local variable table");
1489 if (!_need_verify) {
1490 cfs->skip_u2_fast(size);
1491 } else {
1492 cfs->guarantee_more(size * 2, CHECK_NULL);
1493 for(int i = 0; i < (*localvariable_table_length); i++) {
1494 u2 start_pc = cfs->get_u2_fast();
1495 u2 length = cfs->get_u2_fast();
1496 u2 name_index = cfs->get_u2_fast();
1497 u2 descriptor_index = cfs->get_u2_fast();
1498 u2 index = cfs->get_u2_fast();
1499 // Assign to a u4 to avoid overflow
1500 u4 end_pc = (u4)start_pc + (u4)length;
1502 if (start_pc >= code_length) {
1503 classfile_parse_error(
1504 "Invalid start_pc %u in %s in class file %s",
1505 start_pc, tbl_name, CHECK_NULL);
1506 }
1507 if (end_pc > code_length) {
1508 classfile_parse_error(
1509 "Invalid length %u in %s in class file %s",
1510 length, tbl_name, CHECK_NULL);
1511 }
1512 int cp_size = _cp->length();
1513 guarantee_property(valid_symbol_at(name_index),
1514 "Name index %u in %s has bad constant type in class file %s",
1515 name_index, tbl_name, CHECK_NULL);
1516 guarantee_property(valid_symbol_at(descriptor_index),
1517 "Signature index %u in %s has bad constant type in class file %s",
1518 descriptor_index, tbl_name, CHECK_NULL);
1520 Symbol* name = _cp->symbol_at(name_index);
1521 Symbol* sig = _cp->symbol_at(descriptor_index);
1522 verify_legal_field_name(name, CHECK_NULL);
1523 u2 extra_slot = 0;
1524 if (!isLVTT) {
1525 verify_legal_field_signature(name, sig, CHECK_NULL);
1527 // 4894874: check special cases for double and long local variables
1528 if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1529 sig == vmSymbols::type_signature(T_LONG)) {
1530 extra_slot = 1;
1531 }
1532 }
1533 guarantee_property((index + extra_slot) < max_locals,
1534 "Invalid index %u in %s in class file %s",
1535 index, tbl_name, CHECK_NULL);
1536 }
1537 }
1538 return localvariable_table_start;
1539 }
1542 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1543 u1* u1_array, u2* u2_array, TRAPS) {
1544 ClassFileStream* cfs = stream();
1545 u2 index = 0; // index in the array with long/double occupying two slots
1546 u4 i1 = *u1_index;
1547 u4 i2 = *u2_index + 1;
1548 for(int i = 0; i < array_length; i++) {
1549 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1550 index++;
1551 if (tag == ITEM_Long || tag == ITEM_Double) {
1552 index++;
1553 } else if (tag == ITEM_Object) {
1554 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1555 guarantee_property(valid_klass_reference_at(class_index),
1556 "Bad class index %u in StackMap in class file %s",
1557 class_index, CHECK);
1558 } else if (tag == ITEM_Uninitialized) {
1559 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1560 guarantee_property(
1561 offset < code_length,
1562 "Bad uninitialized type offset %u in StackMap in class file %s",
1563 offset, CHECK);
1564 } else {
1565 guarantee_property(
1566 tag <= (u1)ITEM_Uninitialized,
1567 "Unknown variable type %u in StackMap in class file %s",
1568 tag, CHECK);
1569 }
1570 }
1571 u2_array[*u2_index] = index;
1572 *u1_index = i1;
1573 *u2_index = i2;
1574 }
1576 u1* ClassFileParser::parse_stackmap_table(
1577 u4 code_attribute_length, TRAPS) {
1578 if (code_attribute_length == 0)
1579 return NULL;
1581 ClassFileStream* cfs = stream();
1582 u1* stackmap_table_start = cfs->get_u1_buffer();
1583 assert(stackmap_table_start != NULL, "null stackmap table");
1585 // check code_attribute_length first
1586 stream()->skip_u1(code_attribute_length, CHECK_NULL);
1588 if (!_need_verify && !DumpSharedSpaces) {
1589 return NULL;
1590 }
1591 return stackmap_table_start;
1592 }
1594 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1595 u4 method_attribute_length,
1596 TRAPS) {
1597 ClassFileStream* cfs = stream();
1598 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
1599 *checked_exceptions_length = cfs->get_u2_fast();
1600 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1601 u2* checked_exceptions_start = cfs->get_u2_buffer();
1602 assert(checked_exceptions_start != NULL, "null checked exceptions");
1603 if (!_need_verify) {
1604 cfs->skip_u2_fast(size);
1605 } else {
1606 // Verify each value in the checked exception table
1607 u2 checked_exception;
1608 u2 len = *checked_exceptions_length;
1609 cfs->guarantee_more(2 * len, CHECK_NULL);
1610 for (int i = 0; i < len; i++) {
1611 checked_exception = cfs->get_u2_fast();
1612 check_property(
1613 valid_klass_reference_at(checked_exception),
1614 "Exception name has bad type at constant pool %u in class file %s",
1615 checked_exception, CHECK_NULL);
1616 }
1617 }
1618 // check exceptions attribute length
1619 if (_need_verify) {
1620 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1621 sizeof(u2) * size),
1622 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1623 }
1624 return checked_exceptions_start;
1625 }
1627 void ClassFileParser::throwIllegalSignature(
1628 const char* type, Symbol* name, Symbol* sig, TRAPS) {
1629 ResourceMark rm(THREAD);
1630 Exceptions::fthrow(THREAD_AND_LOCATION,
1631 vmSymbols::java_lang_ClassFormatError(),
1632 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1633 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1634 }
1636 // Skip an annotation. Return >=limit if there is any problem.
1637 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1638 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1639 // value := switch (tag:u1) { ... }
1640 index += 2; // skip atype
1641 if ((index += 2) >= limit) return limit; // read nmem
1642 int nmem = Bytes::get_Java_u2(buffer+index-2);
1643 while (--nmem >= 0 && index < limit) {
1644 index += 2; // skip member
1645 index = skip_annotation_value(buffer, limit, index);
1646 }
1647 return index;
1648 }
1650 // Skip an annotation value. Return >=limit if there is any problem.
1651 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1652 // value := switch (tag:u1) {
1653 // case B, C, I, S, Z, D, F, J, c: con:u2;
1654 // case e: e_class:u2 e_name:u2;
1655 // case s: s_con:u2;
1656 // case [: do(nval:u2) {value};
1657 // case @: annotation;
1658 // case s: s_con:u2;
1659 // }
1660 if ((index += 1) >= limit) return limit; // read tag
1661 u1 tag = buffer[index-1];
1662 switch (tag) {
1663 case 'B': case 'C': case 'I': case 'S': case 'Z':
1664 case 'D': case 'F': case 'J': case 'c': case 's':
1665 index += 2; // skip con or s_con
1666 break;
1667 case 'e':
1668 index += 4; // skip e_class, e_name
1669 break;
1670 case '[':
1671 {
1672 if ((index += 2) >= limit) return limit; // read nval
1673 int nval = Bytes::get_Java_u2(buffer+index-2);
1674 while (--nval >= 0 && index < limit) {
1675 index = skip_annotation_value(buffer, limit, index);
1676 }
1677 }
1678 break;
1679 case '@':
1680 index = skip_annotation(buffer, limit, index);
1681 break;
1682 default:
1683 assert(false, "annotation tag");
1684 return limit; // bad tag byte
1685 }
1686 return index;
1687 }
1689 // Sift through annotations, looking for those significant to the VM:
1690 void ClassFileParser::parse_annotations(u1* buffer, int limit,
1691 ClassFileParser::AnnotationCollector* coll,
1692 TRAPS) {
1693 // annotations := do(nann:u2) {annotation}
1694 int index = 0;
1695 if ((index += 2) >= limit) return; // read nann
1696 int nann = Bytes::get_Java_u2(buffer+index-2);
1697 enum { // initial annotation layout
1698 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
1699 count_off = 2, // u2 such as 1 (one value)
1700 member_off = 4, // utf8 such as 'value'
1701 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
1702 e_tag_val = 'e',
1703 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1704 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1705 e_size = 11, // end of 'e' annotation
1706 c_tag_val = 'c', // payload is type
1707 c_con_off = 7, // utf8 payload, such as 'I'
1708 c_size = 9, // end of 'c' annotation
1709 s_tag_val = 's', // payload is String
1710 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
1711 s_size = 9,
1712 min_size = 6 // smallest possible size (zero members)
1713 };
1714 while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
1715 int index0 = index;
1716 index = skip_annotation(buffer, limit, index);
1717 u1* abase = buffer + index0;
1718 int atype = Bytes::get_Java_u2(abase + atype_off);
1719 int count = Bytes::get_Java_u2(abase + count_off);
1720 Symbol* aname = check_symbol_at(_cp, atype);
1721 if (aname == NULL) break; // invalid annotation name
1722 Symbol* member = NULL;
1723 if (count >= 1) {
1724 int member_index = Bytes::get_Java_u2(abase + member_off);
1725 member = check_symbol_at(_cp, member_index);
1726 if (member == NULL) break; // invalid member name
1727 }
1729 // Here is where parsing particular annotations will take place.
1730 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname);
1731 if (id == AnnotationCollector::_unknown) continue;
1732 coll->set_annotation(id);
1734 if (id == AnnotationCollector::_sun_misc_Contended) {
1735 // @Contended can optionally specify the contention group.
1736 //
1737 // Contended group defines the equivalence class over the fields:
1738 // the fields within the same contended group are not treated distinct.
1739 // The only exception is default group, which does not incur the
1740 // equivalence. Naturally, contention group for classes is meaningless.
1741 //
1742 // While the contention group is specified as String, annotation
1743 // values are already interned, and we might as well use the constant
1744 // pool index as the group tag.
1745 //
1746 u2 group_index = 0; // default contended group
1747 if (count == 1
1748 && s_size == (index - index0) // match size
1749 && s_tag_val == *(abase + tag_off)
1750 && member == vmSymbols::value_name()) {
1751 group_index = Bytes::get_Java_u2(abase + s_con_off);
1752 if (_cp->symbol_at(group_index)->utf8_length() == 0) {
1753 group_index = 0; // default contended group
1754 }
1755 }
1756 coll->set_contended_group(group_index);
1757 }
1758 }
1759 }
1761 ClassFileParser::AnnotationCollector::ID
1762 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1763 Symbol* name) {
1764 vmSymbols::SID sid = vmSymbols::find_sid(name);
1765 // Privileged code can use all annotations. Other code silently drops some.
1766 const bool privileged = loader_data->is_the_null_class_loader_data() ||
1767 loader_data->is_ext_class_loader_data() ||
1768 loader_data->is_anonymous();
1769 switch (sid) {
1770 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature):
1771 if (_location != _in_method) break; // only allow for methods
1772 if (!privileged) break; // only allow in privileged code
1773 return _method_CallerSensitive;
1774 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1775 if (_location != _in_method) break; // only allow for methods
1776 if (!privileged) break; // only allow in privileged code
1777 return _method_ForceInline;
1778 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1779 if (_location != _in_method) break; // only allow for methods
1780 if (!privileged) break; // only allow in privileged code
1781 return _method_DontInline;
1782 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1783 if (_location != _in_method) break; // only allow for methods
1784 if (!privileged) break; // only allow in privileged code
1785 return _method_LambdaForm_Compiled;
1786 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1787 if (_location != _in_method) break; // only allow for methods
1788 if (!privileged) break; // only allow in privileged code
1789 return _method_LambdaForm_Hidden;
1790 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature):
1791 if (_location != _in_field) break; // only allow for fields
1792 if (!privileged) break; // only allow in privileged code
1793 return _field_Stable;
1794 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1795 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
1796 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
1797 return _sun_misc_Contended;
1798 default: break;
1799 }
1800 return AnnotationCollector::_unknown;
1801 }
1803 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1804 if (is_contended())
1805 f->set_contended_group(contended_group());
1806 if (is_stable())
1807 f->set_stable(true);
1808 }
1810 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1811 // If there's an error deallocate metadata for field annotations
1812 MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1813 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1814 }
1816 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1817 if (has_annotation(_method_CallerSensitive))
1818 m->set_caller_sensitive(true);
1819 if (has_annotation(_method_ForceInline))
1820 m->set_force_inline(true);
1821 if (has_annotation(_method_DontInline))
1822 m->set_dont_inline(true);
1823 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1824 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1825 if (has_annotation(_method_LambdaForm_Hidden))
1826 m->set_hidden(true);
1827 }
1829 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1830 k->set_is_contended(is_contended());
1831 }
1834 #define MAX_ARGS_SIZE 255
1835 #define MAX_CODE_SIZE 65535
1836 #define INITIAL_MAX_LVT_NUMBER 256
1838 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1839 *
1840 * Rules for LVT's and LVTT's are:
1841 * - There can be any number of LVT's and LVTT's.
1842 * - If there are n LVT's, it is the same as if there was just
1843 * one LVT containing all the entries from the n LVT's.
1844 * - There may be no more than one LVT entry per local variable.
1845 * Two LVT entries are 'equal' if these fields are the same:
1846 * start_pc, length, name, slot
1847 * - There may be no more than one LVTT entry per each LVT entry.
1848 * Each LVTT entry has to match some LVT entry.
1849 * - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1850 */
1851 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1852 int lvt_cnt,
1853 u2* localvariable_table_length,
1854 u2** localvariable_table_start,
1855 int lvtt_cnt,
1856 u2* localvariable_type_table_length,
1857 u2** localvariable_type_table_start,
1858 TRAPS) {
1860 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1861 initialize_hashtable(lvt_Hash);
1863 // To fill LocalVariableTable in
1864 Classfile_LVT_Element* cf_lvt;
1865 LocalVariableTableElement* lvt = cm->localvariable_table_start();
1867 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1868 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1869 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1870 copy_lvt_element(&cf_lvt[idx], lvt);
1871 // If no duplicates, add LVT elem in hashtable lvt_Hash.
1872 if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1873 && _need_verify
1874 && _major_version >= JAVA_1_5_VERSION) {
1875 clear_hashtable(lvt_Hash);
1876 classfile_parse_error("Duplicated LocalVariableTable attribute "
1877 "entry for '%s' in class file %s",
1878 _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1879 CHECK);
1880 }
1881 }
1882 }
1884 // To merge LocalVariableTable and LocalVariableTypeTable
1885 Classfile_LVT_Element* cf_lvtt;
1886 LocalVariableTableElement lvtt_elem;
1888 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1889 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1890 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1891 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1892 int index = hash(&lvtt_elem);
1893 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1894 if (entry == NULL) {
1895 if (_need_verify) {
1896 clear_hashtable(lvt_Hash);
1897 classfile_parse_error("LVTT entry for '%s' in class file %s "
1898 "does not match any LVT entry",
1899 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1900 CHECK);
1901 }
1902 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1903 clear_hashtable(lvt_Hash);
1904 classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1905 "entry for '%s' in class file %s",
1906 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1907 CHECK);
1908 } else {
1909 // to add generic signatures into LocalVariableTable
1910 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1911 }
1912 }
1913 }
1914 clear_hashtable(lvt_Hash);
1915 }
1918 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1919 u1* runtime_visible_annotations,
1920 int runtime_visible_annotations_length,
1921 u1* runtime_invisible_annotations,
1922 int runtime_invisible_annotations_length,
1923 u1* runtime_visible_parameter_annotations,
1924 int runtime_visible_parameter_annotations_length,
1925 u1* runtime_invisible_parameter_annotations,
1926 int runtime_invisible_parameter_annotations_length,
1927 u1* runtime_visible_type_annotations,
1928 int runtime_visible_type_annotations_length,
1929 u1* runtime_invisible_type_annotations,
1930 int runtime_invisible_type_annotations_length,
1931 u1* annotation_default,
1932 int annotation_default_length,
1933 TRAPS) {
1935 AnnotationArray* a;
1937 if (runtime_visible_annotations_length +
1938 runtime_invisible_annotations_length > 0) {
1939 a = assemble_annotations(runtime_visible_annotations,
1940 runtime_visible_annotations_length,
1941 runtime_invisible_annotations,
1942 runtime_invisible_annotations_length,
1943 CHECK);
1944 cm->set_method_annotations(a);
1945 }
1947 if (runtime_visible_parameter_annotations_length +
1948 runtime_invisible_parameter_annotations_length > 0) {
1949 a = assemble_annotations(runtime_visible_parameter_annotations,
1950 runtime_visible_parameter_annotations_length,
1951 runtime_invisible_parameter_annotations,
1952 runtime_invisible_parameter_annotations_length,
1953 CHECK);
1954 cm->set_parameter_annotations(a);
1955 }
1957 if (annotation_default_length > 0) {
1958 a = assemble_annotations(annotation_default,
1959 annotation_default_length,
1960 NULL,
1961 0,
1962 CHECK);
1963 cm->set_default_annotations(a);
1964 }
1966 if (runtime_visible_type_annotations_length +
1967 runtime_invisible_type_annotations_length > 0) {
1968 a = assemble_annotations(runtime_visible_type_annotations,
1969 runtime_visible_type_annotations_length,
1970 runtime_invisible_type_annotations,
1971 runtime_invisible_type_annotations_length,
1972 CHECK);
1973 cm->set_type_annotations(a);
1974 }
1975 }
1978 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1979 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1980 // Method* to save footprint, so we only know the size of the resulting Method* when the
1981 // entire method attribute is parsed.
1982 //
1983 // The promoted_flags parameter is used to pass relevant access_flags
1984 // from the method back up to the containing klass. These flag values
1985 // are added to klass's access_flags.
1987 methodHandle ClassFileParser::parse_method(bool is_interface,
1988 AccessFlags *promoted_flags,
1989 TRAPS) {
1990 ClassFileStream* cfs = stream();
1991 methodHandle nullHandle;
1992 ResourceMark rm(THREAD);
1993 // Parse fixed parts
1994 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1996 int flags = cfs->get_u2_fast();
1997 u2 name_index = cfs->get_u2_fast();
1998 int cp_size = _cp->length();
1999 check_property(
2000 valid_symbol_at(name_index),
2001 "Illegal constant pool index %u for method name in class file %s",
2002 name_index, CHECK_(nullHandle));
2003 Symbol* name = _cp->symbol_at(name_index);
2004 verify_legal_method_name(name, CHECK_(nullHandle));
2006 u2 signature_index = cfs->get_u2_fast();
2007 guarantee_property(
2008 valid_symbol_at(signature_index),
2009 "Illegal constant pool index %u for method signature in class file %s",
2010 signature_index, CHECK_(nullHandle));
2011 Symbol* signature = _cp->symbol_at(signature_index);
2013 AccessFlags access_flags;
2014 if (name == vmSymbols::class_initializer_name()) {
2015 // We ignore the other access flags for a valid class initializer.
2016 // (JVM Spec 2nd ed., chapter 4.6)
2017 if (_major_version < 51) { // backward compatibility
2018 flags = JVM_ACC_STATIC;
2019 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2020 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2021 }
2022 } else {
2023 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
2024 }
2026 int args_size = -1; // only used when _need_verify is true
2027 if (_need_verify) {
2028 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2029 verify_legal_method_signature(name, signature, CHECK_(nullHandle));
2030 if (args_size > MAX_ARGS_SIZE) {
2031 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
2032 }
2033 }
2035 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2037 // Default values for code and exceptions attribute elements
2038 u2 max_stack = 0;
2039 u2 max_locals = 0;
2040 u4 code_length = 0;
2041 u1* code_start = 0;
2042 u2 exception_table_length = 0;
2043 u2* exception_table_start = NULL;
2044 Array<int>* exception_handlers = Universe::the_empty_int_array();
2045 u2 checked_exceptions_length = 0;
2046 u2* checked_exceptions_start = NULL;
2047 CompressedLineNumberWriteStream* linenumber_table = NULL;
2048 int linenumber_table_length = 0;
2049 int total_lvt_length = 0;
2050 u2 lvt_cnt = 0;
2051 u2 lvtt_cnt = 0;
2052 bool lvt_allocated = false;
2053 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2054 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2055 u2* localvariable_table_length;
2056 u2** localvariable_table_start;
2057 u2* localvariable_type_table_length;
2058 u2** localvariable_type_table_start;
2059 u2 method_parameters_length = 0;
2060 u1* method_parameters_data = NULL;
2061 bool method_parameters_seen = false;
2062 bool parsed_code_attribute = false;
2063 bool parsed_checked_exceptions_attribute = false;
2064 bool parsed_stackmap_attribute = false;
2065 // stackmap attribute - JDK1.5
2066 u1* stackmap_data = NULL;
2067 int stackmap_data_length = 0;
2068 u2 generic_signature_index = 0;
2069 MethodAnnotationCollector parsed_annotations;
2070 u1* runtime_visible_annotations = NULL;
2071 int runtime_visible_annotations_length = 0;
2072 u1* runtime_invisible_annotations = NULL;
2073 int runtime_invisible_annotations_length = 0;
2074 u1* runtime_visible_parameter_annotations = NULL;
2075 int runtime_visible_parameter_annotations_length = 0;
2076 u1* runtime_invisible_parameter_annotations = NULL;
2077 int runtime_invisible_parameter_annotations_length = 0;
2078 u1* runtime_visible_type_annotations = NULL;
2079 int runtime_visible_type_annotations_length = 0;
2080 u1* runtime_invisible_type_annotations = NULL;
2081 int runtime_invisible_type_annotations_length = 0;
2082 bool runtime_invisible_type_annotations_exists = false;
2083 u1* annotation_default = NULL;
2084 int annotation_default_length = 0;
2086 // Parse code and exceptions attribute
2087 u2 method_attributes_count = cfs->get_u2_fast();
2088 while (method_attributes_count--) {
2089 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
2090 u2 method_attribute_name_index = cfs->get_u2_fast();
2091 u4 method_attribute_length = cfs->get_u4_fast();
2092 check_property(
2093 valid_symbol_at(method_attribute_name_index),
2094 "Invalid method attribute name index %u in class file %s",
2095 method_attribute_name_index, CHECK_(nullHandle));
2097 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2098 if (method_attribute_name == vmSymbols::tag_code()) {
2099 // Parse Code attribute
2100 if (_need_verify) {
2101 guarantee_property(
2102 !access_flags.is_native() && !access_flags.is_abstract(),
2103 "Code attribute in native or abstract methods in class file %s",
2104 CHECK_(nullHandle));
2105 }
2106 if (parsed_code_attribute) {
2107 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2108 }
2109 parsed_code_attribute = true;
2111 // Stack size, locals size, and code size
2112 if (_major_version == 45 && _minor_version <= 2) {
2113 cfs->guarantee_more(4, CHECK_(nullHandle));
2114 max_stack = cfs->get_u1_fast();
2115 max_locals = cfs->get_u1_fast();
2116 code_length = cfs->get_u2_fast();
2117 } else {
2118 cfs->guarantee_more(8, CHECK_(nullHandle));
2119 max_stack = cfs->get_u2_fast();
2120 max_locals = cfs->get_u2_fast();
2121 code_length = cfs->get_u4_fast();
2122 }
2123 if (_need_verify) {
2124 guarantee_property(args_size <= max_locals,
2125 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2126 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2127 "Invalid method Code length %u in class file %s",
2128 code_length, CHECK_(nullHandle));
2129 }
2130 // Code pointer
2131 code_start = cfs->get_u1_buffer();
2132 assert(code_start != NULL, "null code start");
2133 cfs->guarantee_more(code_length, CHECK_(nullHandle));
2134 cfs->skip_u1_fast(code_length);
2136 // Exception handler table
2137 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
2138 exception_table_length = cfs->get_u2_fast();
2139 if (exception_table_length > 0) {
2140 exception_table_start =
2141 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2142 }
2144 // Parse additional attributes in code attribute
2145 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
2146 u2 code_attributes_count = cfs->get_u2_fast();
2148 unsigned int calculated_attribute_length = 0;
2150 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2151 calculated_attribute_length =
2152 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2153 } else {
2154 // max_stack, locals and length are smaller in pre-version 45.2 classes
2155 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2156 }
2157 calculated_attribute_length +=
2158 code_length +
2159 sizeof(exception_table_length) +
2160 sizeof(code_attributes_count) +
2161 exception_table_length *
2162 ( sizeof(u2) + // start_pc
2163 sizeof(u2) + // end_pc
2164 sizeof(u2) + // handler_pc
2165 sizeof(u2) ); // catch_type_index
2167 while (code_attributes_count--) {
2168 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
2169 u2 code_attribute_name_index = cfs->get_u2_fast();
2170 u4 code_attribute_length = cfs->get_u4_fast();
2171 calculated_attribute_length += code_attribute_length +
2172 sizeof(code_attribute_name_index) +
2173 sizeof(code_attribute_length);
2174 check_property(valid_symbol_at(code_attribute_name_index),
2175 "Invalid code attribute name index %u in class file %s",
2176 code_attribute_name_index,
2177 CHECK_(nullHandle));
2178 if (LoadLineNumberTables &&
2179 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2180 // Parse and compress line number table
2181 parse_linenumber_table(code_attribute_length, code_length,
2182 &linenumber_table, CHECK_(nullHandle));
2184 } else if (LoadLocalVariableTables &&
2185 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2186 // Parse local variable table
2187 if (!lvt_allocated) {
2188 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2189 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2190 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2191 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2192 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2193 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2194 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2195 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2196 lvt_allocated = true;
2197 }
2198 if (lvt_cnt == max_lvt_cnt) {
2199 max_lvt_cnt <<= 1;
2200 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2201 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2202 }
2203 localvariable_table_start[lvt_cnt] =
2204 parse_localvariable_table(code_length,
2205 max_locals,
2206 code_attribute_length,
2207 &localvariable_table_length[lvt_cnt],
2208 false, // is not LVTT
2209 CHECK_(nullHandle));
2210 total_lvt_length += localvariable_table_length[lvt_cnt];
2211 lvt_cnt++;
2212 } else if (LoadLocalVariableTypeTables &&
2213 _major_version >= JAVA_1_5_VERSION &&
2214 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2215 if (!lvt_allocated) {
2216 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2217 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2218 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2219 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2220 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2221 THREAD, u2, INITIAL_MAX_LVT_NUMBER);
2222 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2223 THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2224 lvt_allocated = true;
2225 }
2226 // Parse local variable type table
2227 if (lvtt_cnt == max_lvtt_cnt) {
2228 max_lvtt_cnt <<= 1;
2229 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2230 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2231 }
2232 localvariable_type_table_start[lvtt_cnt] =
2233 parse_localvariable_table(code_length,
2234 max_locals,
2235 code_attribute_length,
2236 &localvariable_type_table_length[lvtt_cnt],
2237 true, // is LVTT
2238 CHECK_(nullHandle));
2239 lvtt_cnt++;
2240 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2241 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2242 // Stack map is only needed by the new verifier in JDK1.5.
2243 if (parsed_stackmap_attribute) {
2244 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2245 }
2246 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2247 stackmap_data_length = code_attribute_length;
2248 parsed_stackmap_attribute = true;
2249 } else {
2250 // Skip unknown attributes
2251 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2252 }
2253 }
2254 // check method attribute length
2255 if (_need_verify) {
2256 guarantee_property(method_attribute_length == calculated_attribute_length,
2257 "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2258 }
2259 } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2260 // Parse Exceptions attribute
2261 if (parsed_checked_exceptions_attribute) {
2262 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2263 }
2264 parsed_checked_exceptions_attribute = true;
2265 checked_exceptions_start =
2266 parse_checked_exceptions(&checked_exceptions_length,
2267 method_attribute_length,
2268 CHECK_(nullHandle));
2269 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2270 // reject multiple method parameters
2271 if (method_parameters_seen) {
2272 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2273 }
2274 method_parameters_seen = true;
2275 method_parameters_length = cfs->get_u1_fast();
2276 if (method_attribute_length != (method_parameters_length * 4u) + 1u) {
2277 classfile_parse_error(
2278 "Invalid MethodParameters method attribute length %u in class file",
2279 method_attribute_length, CHECK_(nullHandle));
2280 }
2281 method_parameters_data = cfs->get_u1_buffer();
2282 cfs->skip_u2_fast(method_parameters_length);
2283 cfs->skip_u2_fast(method_parameters_length);
2284 // ignore this attribute if it cannot be reflected
2285 if (!SystemDictionary::Parameter_klass_loaded())
2286 method_parameters_length = 0;
2287 } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2288 if (method_attribute_length != 0) {
2289 classfile_parse_error(
2290 "Invalid Synthetic method attribute length %u in class file %s",
2291 method_attribute_length, CHECK_(nullHandle));
2292 }
2293 // Should we check that there hasn't already been a synthetic attribute?
2294 access_flags.set_is_synthetic();
2295 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2296 if (method_attribute_length != 0) {
2297 classfile_parse_error(
2298 "Invalid Deprecated method attribute length %u in class file %s",
2299 method_attribute_length, CHECK_(nullHandle));
2300 }
2301 } else if (_major_version >= JAVA_1_5_VERSION) {
2302 if (method_attribute_name == vmSymbols::tag_signature()) {
2303 if (method_attribute_length != 2) {
2304 classfile_parse_error(
2305 "Invalid Signature attribute length %u in class file %s",
2306 method_attribute_length, CHECK_(nullHandle));
2307 }
2308 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle));
2309 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2310 runtime_visible_annotations_length = method_attribute_length;
2311 runtime_visible_annotations = cfs->get_u1_buffer();
2312 assert(runtime_visible_annotations != NULL, "null visible annotations");
2313 parse_annotations(runtime_visible_annotations,
2314 runtime_visible_annotations_length, &parsed_annotations,
2315 CHECK_(nullHandle));
2316 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2317 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2318 runtime_invisible_annotations_length = method_attribute_length;
2319 runtime_invisible_annotations = cfs->get_u1_buffer();
2320 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2321 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
2322 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2323 runtime_visible_parameter_annotations_length = method_attribute_length;
2324 runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2325 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2326 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2327 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2328 runtime_invisible_parameter_annotations_length = method_attribute_length;
2329 runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2330 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2331 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
2332 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2333 annotation_default_length = method_attribute_length;
2334 annotation_default = cfs->get_u1_buffer();
2335 assert(annotation_default != NULL, "null annotation default");
2336 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2337 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2338 if (runtime_visible_type_annotations != NULL) {
2339 classfile_parse_error(
2340 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2341 CHECK_(nullHandle));
2342 }
2343 runtime_visible_type_annotations_length = method_attribute_length;
2344 runtime_visible_type_annotations = cfs->get_u1_buffer();
2345 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2346 // No need for the VM to parse Type annotations
2347 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2348 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2349 if (runtime_invisible_type_annotations_exists) {
2350 classfile_parse_error(
2351 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2352 CHECK_(nullHandle));
2353 } else {
2354 runtime_invisible_type_annotations_exists = true;
2355 }
2356 if (PreserveAllAnnotations) {
2357 runtime_invisible_type_annotations_length = method_attribute_length;
2358 runtime_invisible_type_annotations = cfs->get_u1_buffer();
2359 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2360 }
2361 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2362 } else {
2363 // Skip unknown attributes
2364 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2365 }
2366 } else {
2367 // Skip unknown attributes
2368 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2369 }
2370 }
2372 if (linenumber_table != NULL) {
2373 linenumber_table->write_terminator();
2374 linenumber_table_length = linenumber_table->position();
2375 }
2377 // Make sure there's at least one Code attribute in non-native/non-abstract method
2378 if (_need_verify) {
2379 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2380 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2381 }
2383 // All sizing information for a Method* is finally available, now create it
2384 InlineTableSizes sizes(
2385 total_lvt_length,
2386 linenumber_table_length,
2387 exception_table_length,
2388 checked_exceptions_length,
2389 method_parameters_length,
2390 generic_signature_index,
2391 runtime_visible_annotations_length +
2392 runtime_invisible_annotations_length,
2393 runtime_visible_parameter_annotations_length +
2394 runtime_invisible_parameter_annotations_length,
2395 runtime_visible_type_annotations_length +
2396 runtime_invisible_type_annotations_length,
2397 annotation_default_length,
2398 0);
2400 Method* m = Method::allocate(
2401 _loader_data, code_length, access_flags, &sizes,
2402 ConstMethod::NORMAL, CHECK_(nullHandle));
2404 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2406 // Fill in information from fixed part (access_flags already set)
2407 m->set_constants(_cp);
2408 m->set_name_index(name_index);
2409 m->set_signature_index(signature_index);
2410 #ifdef CC_INTERP
2411 // hmm is there a gc issue here??
2412 ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2413 m->set_result_index(rtf.type());
2414 #endif
2416 if (args_size >= 0) {
2417 m->set_size_of_parameters(args_size);
2418 } else {
2419 m->compute_size_of_parameters(THREAD);
2420 }
2421 #ifdef ASSERT
2422 if (args_size >= 0) {
2423 m->compute_size_of_parameters(THREAD);
2424 assert(args_size == m->size_of_parameters(), "");
2425 }
2426 #endif
2428 // Fill in code attribute information
2429 m->set_max_stack(max_stack);
2430 m->set_max_locals(max_locals);
2431 if (stackmap_data != NULL) {
2432 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2433 stackmap_data_length, CHECK_NULL);
2434 }
2436 // Copy byte codes
2437 m->set_code(code_start);
2439 // Copy line number table
2440 if (linenumber_table != NULL) {
2441 memcpy(m->compressed_linenumber_table(),
2442 linenumber_table->buffer(), linenumber_table_length);
2443 }
2445 // Copy exception table
2446 if (exception_table_length > 0) {
2447 int size =
2448 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2449 copy_u2_with_conversion((u2*) m->exception_table_start(),
2450 exception_table_start, size);
2451 }
2453 // Copy method parameters
2454 if (method_parameters_length > 0) {
2455 MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2456 for (int i = 0; i < method_parameters_length; i++) {
2457 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2458 method_parameters_data += 2;
2459 elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2460 method_parameters_data += 2;
2461 }
2462 }
2464 // Copy checked exceptions
2465 if (checked_exceptions_length > 0) {
2466 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2467 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2468 }
2470 // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2471 if (total_lvt_length > 0) {
2472 promoted_flags->set_has_localvariable_table();
2473 copy_localvariable_table(m->constMethod(), lvt_cnt,
2474 localvariable_table_length,
2475 localvariable_table_start,
2476 lvtt_cnt,
2477 localvariable_type_table_length,
2478 localvariable_type_table_start, CHECK_NULL);
2479 }
2481 if (parsed_annotations.has_any_annotations())
2482 parsed_annotations.apply_to(m);
2484 // Copy annotations
2485 copy_method_annotations(m->constMethod(),
2486 runtime_visible_annotations,
2487 runtime_visible_annotations_length,
2488 runtime_invisible_annotations,
2489 runtime_invisible_annotations_length,
2490 runtime_visible_parameter_annotations,
2491 runtime_visible_parameter_annotations_length,
2492 runtime_invisible_parameter_annotations,
2493 runtime_invisible_parameter_annotations_length,
2494 runtime_visible_type_annotations,
2495 runtime_visible_type_annotations_length,
2496 runtime_invisible_type_annotations,
2497 runtime_invisible_type_annotations_length,
2498 annotation_default,
2499 annotation_default_length,
2500 CHECK_NULL);
2502 if (name == vmSymbols::finalize_method_name() &&
2503 signature == vmSymbols::void_method_signature()) {
2504 if (m->is_empty_method()) {
2505 _has_empty_finalizer = true;
2506 } else {
2507 _has_finalizer = true;
2508 }
2509 }
2510 if (name == vmSymbols::object_initializer_name() &&
2511 signature == vmSymbols::void_method_signature() &&
2512 m->is_vanilla_constructor()) {
2513 _has_vanilla_constructor = true;
2514 }
2516 NOT_PRODUCT(m->verify());
2517 return m;
2518 }
2521 // The promoted_flags parameter is used to pass relevant access_flags
2522 // from the methods back up to the containing klass. These flag values
2523 // are added to klass's access_flags.
2525 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2526 AccessFlags* promoted_flags,
2527 bool* has_final_method,
2528 bool* has_default_methods,
2529 TRAPS) {
2530 ClassFileStream* cfs = stream();
2531 cfs->guarantee_more(2, CHECK_NULL); // length
2532 u2 length = cfs->get_u2_fast();
2533 if (length == 0) {
2534 _methods = Universe::the_empty_method_array();
2535 } else {
2536 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2538 HandleMark hm(THREAD);
2539 for (int index = 0; index < length; index++) {
2540 methodHandle method = parse_method(is_interface,
2541 promoted_flags,
2542 CHECK_NULL);
2544 if (method->is_final()) {
2545 *has_final_method = true;
2546 }
2547 if (is_interface && !(*has_default_methods)
2548 && !method->is_abstract() && !method->is_static()
2549 && !method->is_private()) {
2550 // default method
2551 *has_default_methods = true;
2552 }
2553 _methods->at_put(index, method());
2554 }
2556 if (_need_verify && length > 1) {
2557 // Check duplicated methods
2558 ResourceMark rm(THREAD);
2559 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2560 THREAD, NameSigHash*, HASH_ROW_SIZE);
2561 initialize_hashtable(names_and_sigs);
2562 bool dup = false;
2563 {
2564 debug_only(No_Safepoint_Verifier nsv;)
2565 for (int i = 0; i < length; i++) {
2566 Method* m = _methods->at(i);
2567 // If no duplicates, add name/signature in hashtable names_and_sigs.
2568 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2569 dup = true;
2570 break;
2571 }
2572 }
2573 }
2574 if (dup) {
2575 classfile_parse_error("Duplicate method name&signature in class file %s",
2576 CHECK_NULL);
2577 }
2578 }
2579 }
2580 return _methods;
2581 }
2584 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2585 int length = methods->length();
2586 // If JVMTI original method ordering or sharing is enabled we have to
2587 // remember the original class file ordering.
2588 // We temporarily use the vtable_index field in the Method* to store the
2589 // class file index, so we can read in after calling qsort.
2590 // Put the method ordering in the shared archive.
2591 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2592 for (int index = 0; index < length; index++) {
2593 Method* m = methods->at(index);
2594 assert(!m->valid_vtable_index(), "vtable index should not be set");
2595 m->set_vtable_index(index);
2596 }
2597 }
2598 // Sort method array by ascending method name (for faster lookups & vtable construction)
2599 // Note that the ordering is not alphabetical, see Symbol::fast_compare
2600 Method::sort_methods(methods);
2602 intArray* method_ordering = NULL;
2603 // If JVMTI original method ordering or sharing is enabled construct int
2604 // array remembering the original ordering
2605 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2606 method_ordering = new intArray(length);
2607 for (int index = 0; index < length; index++) {
2608 Method* m = methods->at(index);
2609 int old_index = m->vtable_index();
2610 assert(old_index >= 0 && old_index < length, "invalid method index");
2611 method_ordering->at_put(index, old_index);
2612 m->set_vtable_index(Method::invalid_vtable_index);
2613 }
2614 }
2615 return method_ordering;
2616 }
2618 // Parse generic_signature attribute for methods and fields
2619 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) {
2620 ClassFileStream* cfs = stream();
2621 cfs->guarantee_more(2, CHECK_0); // generic_signature_index
2622 u2 generic_signature_index = cfs->get_u2_fast();
2623 check_property(
2624 valid_symbol_at(generic_signature_index),
2625 "Invalid Signature attribute at constant pool index %u in class file %s",
2626 generic_signature_index, CHECK_0);
2627 return generic_signature_index;
2628 }
2630 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2631 ClassFileStream* cfs = stream();
2632 cfs->guarantee_more(2, CHECK); // sourcefile_index
2633 u2 sourcefile_index = cfs->get_u2_fast();
2634 check_property(
2635 valid_symbol_at(sourcefile_index),
2636 "Invalid SourceFile attribute at constant pool index %u in class file %s",
2637 sourcefile_index, CHECK);
2638 set_class_sourcefile_index(sourcefile_index);
2639 }
2643 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2644 ClassFileStream* cfs = stream();
2645 u1* sde_buffer = cfs->get_u1_buffer();
2646 assert(sde_buffer != NULL, "null sde buffer");
2648 // Don't bother storing it if there is no way to retrieve it
2649 if (JvmtiExport::can_get_source_debug_extension()) {
2650 assert((length+1) > length, "Overflow checking");
2651 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2652 for (int i = 0; i < length; i++) {
2653 sde[i] = sde_buffer[i];
2654 }
2655 sde[length] = '\0';
2656 set_class_sde_buffer((char*)sde, length);
2657 }
2658 // Got utf8 string, set stream position forward
2659 cfs->skip_u1(length, CHECK);
2660 }
2663 // Inner classes can be static, private or protected (classic VM does this)
2664 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2666 // Return number of classes in the inner classes attribute table
2667 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2668 bool parsed_enclosingmethod_attribute,
2669 u2 enclosing_method_class_index,
2670 u2 enclosing_method_method_index,
2671 TRAPS) {
2672 ClassFileStream* cfs = stream();
2673 u1* current_mark = cfs->current();
2674 u2 length = 0;
2675 if (inner_classes_attribute_start != NULL) {
2676 cfs->set_current(inner_classes_attribute_start);
2677 cfs->guarantee_more(2, CHECK_0); // length
2678 length = cfs->get_u2_fast();
2679 }
2681 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2682 // method data:
2683 // [inner_class_info_index,
2684 // outer_class_info_index,
2685 // inner_name_index,
2686 // inner_class_access_flags,
2687 // ...
2688 // enclosing_method_class_index,
2689 // enclosing_method_method_index]
2690 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2691 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2692 _inner_classes = inner_classes;
2694 int index = 0;
2695 int cp_size = _cp->length();
2696 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
2697 for (int n = 0; n < length; n++) {
2698 // Inner class index
2699 u2 inner_class_info_index = cfs->get_u2_fast();
2700 check_property(
2701 inner_class_info_index == 0 ||
2702 valid_klass_reference_at(inner_class_info_index),
2703 "inner_class_info_index %u has bad constant type in class file %s",
2704 inner_class_info_index, CHECK_0);
2705 // Outer class index
2706 u2 outer_class_info_index = cfs->get_u2_fast();
2707 check_property(
2708 outer_class_info_index == 0 ||
2709 valid_klass_reference_at(outer_class_info_index),
2710 "outer_class_info_index %u has bad constant type in class file %s",
2711 outer_class_info_index, CHECK_0);
2712 // Inner class name
2713 u2 inner_name_index = cfs->get_u2_fast();
2714 check_property(
2715 inner_name_index == 0 || valid_symbol_at(inner_name_index),
2716 "inner_name_index %u has bad constant type in class file %s",
2717 inner_name_index, CHECK_0);
2718 if (_need_verify) {
2719 guarantee_property(inner_class_info_index != outer_class_info_index,
2720 "Class is both outer and inner class in class file %s", CHECK_0);
2721 }
2722 // Access flags
2723 AccessFlags inner_access_flags;
2724 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2725 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2726 // Set abstract bit for old class files for backward compatibility
2727 flags |= JVM_ACC_ABSTRACT;
2728 }
2729 verify_legal_class_modifiers(flags, CHECK_0);
2730 inner_access_flags.set_flags(flags);
2732 inner_classes->at_put(index++, inner_class_info_index);
2733 inner_classes->at_put(index++, outer_class_info_index);
2734 inner_classes->at_put(index++, inner_name_index);
2735 inner_classes->at_put(index++, inner_access_flags.as_short());
2736 }
2738 // 4347400: make sure there's no duplicate entry in the classes array
2739 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2740 for(int i = 0; i < length * 4; i += 4) {
2741 for(int j = i + 4; j < length * 4; j += 4) {
2742 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
2743 inner_classes->at(i+1) != inner_classes->at(j+1) ||
2744 inner_classes->at(i+2) != inner_classes->at(j+2) ||
2745 inner_classes->at(i+3) != inner_classes->at(j+3)),
2746 "Duplicate entry in InnerClasses in class file %s",
2747 CHECK_0);
2748 }
2749 }
2750 }
2752 // Set EnclosingMethod class and method indexes.
2753 if (parsed_enclosingmethod_attribute) {
2754 inner_classes->at_put(index++, enclosing_method_class_index);
2755 inner_classes->at_put(index++, enclosing_method_method_index);
2756 }
2757 assert(index == size, "wrong size");
2759 // Restore buffer's current position.
2760 cfs->set_current(current_mark);
2762 return length;
2763 }
2765 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2766 set_class_synthetic_flag(true);
2767 }
2769 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2770 ClassFileStream* cfs = stream();
2771 u2 signature_index = cfs->get_u2(CHECK);
2772 check_property(
2773 valid_symbol_at(signature_index),
2774 "Invalid constant pool index %u in Signature attribute in class file %s",
2775 signature_index, CHECK);
2776 set_class_generic_signature_index(signature_index);
2777 }
2779 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2780 ClassFileStream* cfs = stream();
2781 u1* current_start = cfs->current();
2783 cfs->guarantee_more(attribute_byte_length, CHECK);
2785 int attribute_array_length = cfs->get_u2_fast();
2787 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2788 "Short length on BootstrapMethods in class file %s",
2789 CHECK);
2791 guarantee_property(attribute_byte_length >= sizeof(u2),
2792 "Invalid BootstrapMethods attribute length %u in class file %s",
2793 attribute_byte_length,
2794 CHECK);
2796 // The attribute contains a counted array of counted tuples of shorts,
2797 // represending bootstrap specifiers:
2798 // length*{bootstrap_method_index, argument_count*{argument_index}}
2799 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2800 // operand_count = number of shorts in attr, except for leading length
2802 // The attribute is copied into a short[] array.
2803 // The array begins with a series of short[2] pairs, one for each tuple.
2804 int index_size = (attribute_array_length * 2);
2806 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2808 // Eagerly assign operands so they will be deallocated with the constant
2809 // pool if there is an error.
2810 _cp->set_operands(operands);
2812 int operand_fill_index = index_size;
2813 int cp_size = _cp->length();
2815 for (int n = 0; n < attribute_array_length; n++) {
2816 // Store a 32-bit offset into the header of the operand array.
2817 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2819 // Read a bootstrap specifier.
2820 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
2821 u2 bootstrap_method_index = cfs->get_u2_fast();
2822 u2 argument_count = cfs->get_u2_fast();
2823 check_property(
2824 valid_cp_range(bootstrap_method_index, cp_size) &&
2825 _cp->tag_at(bootstrap_method_index).is_method_handle(),
2826 "bootstrap_method_index %u has bad constant type in class file %s",
2827 bootstrap_method_index,
2828 CHECK);
2830 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
2831 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
2832 CHECK);
2834 operands->at_put(operand_fill_index++, bootstrap_method_index);
2835 operands->at_put(operand_fill_index++, argument_count);
2837 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
2838 for (int j = 0; j < argument_count; j++) {
2839 u2 argument_index = cfs->get_u2_fast();
2840 check_property(
2841 valid_cp_range(argument_index, cp_size) &&
2842 _cp->tag_at(argument_index).is_loadable_constant(),
2843 "argument_index %u has bad constant type in class file %s",
2844 argument_index,
2845 CHECK);
2846 operands->at_put(operand_fill_index++, argument_index);
2847 }
2848 }
2850 assert(operand_fill_index == operands->length(), "exact fill");
2852 u1* current_end = cfs->current();
2853 guarantee_property(current_end == current_start + attribute_byte_length,
2854 "Bad length on BootstrapMethods in class file %s",
2855 CHECK);
2856 }
2858 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2859 TRAPS) {
2860 ClassFileStream* cfs = stream();
2861 // Set inner classes attribute to default sentinel
2862 _inner_classes = Universe::the_empty_short_array();
2863 cfs->guarantee_more(2, CHECK); // attributes_count
2864 u2 attributes_count = cfs->get_u2_fast();
2865 bool parsed_sourcefile_attribute = false;
2866 bool parsed_innerclasses_attribute = false;
2867 bool parsed_enclosingmethod_attribute = false;
2868 bool parsed_bootstrap_methods_attribute = false;
2869 u1* runtime_visible_annotations = NULL;
2870 int runtime_visible_annotations_length = 0;
2871 u1* runtime_invisible_annotations = NULL;
2872 int runtime_invisible_annotations_length = 0;
2873 u1* runtime_visible_type_annotations = NULL;
2874 int runtime_visible_type_annotations_length = 0;
2875 u1* runtime_invisible_type_annotations = NULL;
2876 int runtime_invisible_type_annotations_length = 0;
2877 bool runtime_invisible_type_annotations_exists = false;
2878 u1* inner_classes_attribute_start = NULL;
2879 u4 inner_classes_attribute_length = 0;
2880 u2 enclosing_method_class_index = 0;
2881 u2 enclosing_method_method_index = 0;
2882 // Iterate over attributes
2883 while (attributes_count--) {
2884 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
2885 u2 attribute_name_index = cfs->get_u2_fast();
2886 u4 attribute_length = cfs->get_u4_fast();
2887 check_property(
2888 valid_symbol_at(attribute_name_index),
2889 "Attribute name has bad constant pool index %u in class file %s",
2890 attribute_name_index, CHECK);
2891 Symbol* tag = _cp->symbol_at(attribute_name_index);
2892 if (tag == vmSymbols::tag_source_file()) {
2893 // Check for SourceFile tag
2894 if (_need_verify) {
2895 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2896 }
2897 if (parsed_sourcefile_attribute) {
2898 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2899 } else {
2900 parsed_sourcefile_attribute = true;
2901 }
2902 parse_classfile_sourcefile_attribute(CHECK);
2903 } else if (tag == vmSymbols::tag_source_debug_extension()) {
2904 // Check for SourceDebugExtension tag
2905 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2906 } else if (tag == vmSymbols::tag_inner_classes()) {
2907 // Check for InnerClasses tag
2908 if (parsed_innerclasses_attribute) {
2909 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2910 } else {
2911 parsed_innerclasses_attribute = true;
2912 }
2913 inner_classes_attribute_start = cfs->get_u1_buffer();
2914 inner_classes_attribute_length = attribute_length;
2915 cfs->skip_u1(inner_classes_attribute_length, CHECK);
2916 } else if (tag == vmSymbols::tag_synthetic()) {
2917 // Check for Synthetic tag
2918 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2919 if (attribute_length != 0) {
2920 classfile_parse_error(
2921 "Invalid Synthetic classfile attribute length %u in class file %s",
2922 attribute_length, CHECK);
2923 }
2924 parse_classfile_synthetic_attribute(CHECK);
2925 } else if (tag == vmSymbols::tag_deprecated()) {
2926 // Check for Deprecatd tag - 4276120
2927 if (attribute_length != 0) {
2928 classfile_parse_error(
2929 "Invalid Deprecated classfile attribute length %u in class file %s",
2930 attribute_length, CHECK);
2931 }
2932 } else if (_major_version >= JAVA_1_5_VERSION) {
2933 if (tag == vmSymbols::tag_signature()) {
2934 if (attribute_length != 2) {
2935 classfile_parse_error(
2936 "Wrong Signature attribute length %u in class file %s",
2937 attribute_length, CHECK);
2938 }
2939 parse_classfile_signature_attribute(CHECK);
2940 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2941 runtime_visible_annotations_length = attribute_length;
2942 runtime_visible_annotations = cfs->get_u1_buffer();
2943 assert(runtime_visible_annotations != NULL, "null visible annotations");
2944 parse_annotations(runtime_visible_annotations,
2945 runtime_visible_annotations_length,
2946 parsed_annotations,
2947 CHECK);
2948 cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2949 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2950 runtime_invisible_annotations_length = attribute_length;
2951 runtime_invisible_annotations = cfs->get_u1_buffer();
2952 assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2953 cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2954 } else if (tag == vmSymbols::tag_enclosing_method()) {
2955 if (parsed_enclosingmethod_attribute) {
2956 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2957 } else {
2958 parsed_enclosingmethod_attribute = true;
2959 }
2960 cfs->guarantee_more(4, CHECK); // class_index, method_index
2961 enclosing_method_class_index = cfs->get_u2_fast();
2962 enclosing_method_method_index = cfs->get_u2_fast();
2963 if (enclosing_method_class_index == 0) {
2964 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2965 }
2966 // Validate the constant pool indices and types
2967 check_property(valid_klass_reference_at(enclosing_method_class_index),
2968 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2969 if (enclosing_method_method_index != 0 &&
2970 (!_cp->is_within_bounds(enclosing_method_method_index) ||
2971 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2972 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2973 }
2974 } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2975 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2976 if (parsed_bootstrap_methods_attribute)
2977 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2978 parsed_bootstrap_methods_attribute = true;
2979 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
2980 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
2981 if (runtime_visible_type_annotations != NULL) {
2982 classfile_parse_error(
2983 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
2984 }
2985 runtime_visible_type_annotations_length = attribute_length;
2986 runtime_visible_type_annotations = cfs->get_u1_buffer();
2987 assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2988 // No need for the VM to parse Type annotations
2989 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
2990 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
2991 if (runtime_invisible_type_annotations_exists) {
2992 classfile_parse_error(
2993 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
2994 } else {
2995 runtime_invisible_type_annotations_exists = true;
2996 }
2997 if (PreserveAllAnnotations) {
2998 runtime_invisible_type_annotations_length = attribute_length;
2999 runtime_invisible_type_annotations = cfs->get_u1_buffer();
3000 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3001 }
3002 cfs->skip_u1(attribute_length, CHECK);
3003 } else {
3004 // Unknown attribute
3005 cfs->skip_u1(attribute_length, CHECK);
3006 }
3007 } else {
3008 // Unknown attribute
3009 cfs->skip_u1(attribute_length, CHECK);
3010 }
3011 }
3012 _annotations = assemble_annotations(runtime_visible_annotations,
3013 runtime_visible_annotations_length,
3014 runtime_invisible_annotations,
3015 runtime_invisible_annotations_length,
3016 CHECK);
3017 _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3018 runtime_visible_type_annotations_length,
3019 runtime_invisible_type_annotations,
3020 runtime_invisible_type_annotations_length,
3021 CHECK);
3023 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3024 u2 num_of_classes = parse_classfile_inner_classes_attribute(
3025 inner_classes_attribute_start,
3026 parsed_innerclasses_attribute,
3027 enclosing_method_class_index,
3028 enclosing_method_method_index,
3029 CHECK);
3030 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3031 guarantee_property(
3032 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3033 "Wrong InnerClasses attribute length in class file %s", CHECK);
3034 }
3035 }
3037 if (_max_bootstrap_specifier_index >= 0) {
3038 guarantee_property(parsed_bootstrap_methods_attribute,
3039 "Missing BootstrapMethods attribute in class file %s", CHECK);
3040 }
3041 }
3043 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
3044 if (_synthetic_flag)
3045 k->set_is_synthetic();
3046 if (_sourcefile_index != 0) {
3047 k->set_source_file_name_index(_sourcefile_index);
3048 }
3049 if (_generic_signature_index != 0) {
3050 k->set_generic_signature_index(_generic_signature_index);
3051 }
3052 if (_sde_buffer != NULL) {
3053 k->set_source_debug_extension(_sde_buffer, _sde_length);
3054 }
3055 }
3057 // Transfer ownership of metadata allocated to the InstanceKlass.
3058 void ClassFileParser::apply_parsed_class_metadata(
3059 instanceKlassHandle this_klass,
3060 int java_fields_count, TRAPS) {
3061 // Assign annotations if needed
3062 if (_annotations != NULL || _type_annotations != NULL ||
3063 _fields_annotations != NULL || _fields_type_annotations != NULL) {
3064 Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3065 annotations->set_class_annotations(_annotations);
3066 annotations->set_class_type_annotations(_type_annotations);
3067 annotations->set_fields_annotations(_fields_annotations);
3068 annotations->set_fields_type_annotations(_fields_type_annotations);
3069 this_klass->set_annotations(annotations);
3070 }
3072 _cp->set_pool_holder(this_klass());
3073 this_klass->set_constants(_cp);
3074 this_klass->set_fields(_fields, java_fields_count);
3075 this_klass->set_methods(_methods);
3076 this_klass->set_inner_classes(_inner_classes);
3077 this_klass->set_local_interfaces(_local_interfaces);
3078 this_klass->set_transitive_interfaces(_transitive_interfaces);
3080 // Clear out these fields so they don't get deallocated by the destructor
3081 clear_class_metadata();
3082 }
3084 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3085 int runtime_visible_annotations_length,
3086 u1* runtime_invisible_annotations,
3087 int runtime_invisible_annotations_length, TRAPS) {
3088 AnnotationArray* annotations = NULL;
3089 if (runtime_visible_annotations != NULL ||
3090 runtime_invisible_annotations != NULL) {
3091 annotations = MetadataFactory::new_array<u1>(_loader_data,
3092 runtime_visible_annotations_length +
3093 runtime_invisible_annotations_length,
3094 CHECK_(annotations));
3095 if (runtime_visible_annotations != NULL) {
3096 for (int i = 0; i < runtime_visible_annotations_length; i++) {
3097 annotations->at_put(i, runtime_visible_annotations[i]);
3098 }
3099 }
3100 if (runtime_invisible_annotations != NULL) {
3101 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3102 int append = runtime_visible_annotations_length+i;
3103 annotations->at_put(append, runtime_invisible_annotations[i]);
3104 }
3105 }
3106 }
3107 return annotations;
3108 }
3110 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3111 TRAPS) {
3112 instanceKlassHandle super_klass;
3113 if (super_class_index == 0) {
3114 check_property(_class_name == vmSymbols::java_lang_Object(),
3115 "Invalid superclass index %u in class file %s",
3116 super_class_index,
3117 CHECK_NULL);
3118 } else {
3119 check_property(valid_klass_reference_at(super_class_index),
3120 "Invalid superclass index %u in class file %s",
3121 super_class_index,
3122 CHECK_NULL);
3123 // The class name should be legal because it is checked when parsing constant pool.
3124 // However, make sure it is not an array type.
3125 bool is_array = false;
3126 if (_cp->tag_at(super_class_index).is_klass()) {
3127 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3128 if (_need_verify)
3129 is_array = super_klass->oop_is_array();
3130 } else if (_need_verify) {
3131 is_array = (_cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3132 }
3133 if (_need_verify) {
3134 guarantee_property(!is_array,
3135 "Bad superclass name in class file %s", CHECK_NULL);
3136 }
3137 }
3138 return super_klass;
3139 }
3142 // Values needed for oopmap and InstanceKlass creation
3143 class FieldLayoutInfo : public StackObj {
3144 public:
3145 int* nonstatic_oop_offsets;
3146 unsigned int* nonstatic_oop_counts;
3147 unsigned int nonstatic_oop_map_count;
3148 unsigned int total_oop_map_count;
3149 int instance_size;
3150 int nonstatic_field_size;
3151 int static_field_size;
3152 bool has_nonstatic_fields;
3153 };
3155 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3156 void ClassFileParser::layout_fields(Handle class_loader,
3157 FieldAllocationCount* fac,
3158 ClassAnnotationCollector* parsed_annotations,
3159 FieldLayoutInfo* info,
3160 TRAPS) {
3162 // Field size and offset computation
3163 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3164 int next_static_oop_offset;
3165 int next_static_double_offset;
3166 int next_static_word_offset;
3167 int next_static_short_offset;
3168 int next_static_byte_offset;
3169 int next_nonstatic_oop_offset;
3170 int next_nonstatic_double_offset;
3171 int next_nonstatic_word_offset;
3172 int next_nonstatic_short_offset;
3173 int next_nonstatic_byte_offset;
3174 int first_nonstatic_oop_offset;
3175 int next_nonstatic_field_offset;
3176 int next_nonstatic_padded_offset;
3178 // Count the contended fields by type.
3179 //
3180 // We ignore static fields, because @Contended is not supported for them.
3181 // The layout code below will also ignore the static fields.
3182 int nonstatic_contended_count = 0;
3183 FieldAllocationCount fac_contended;
3184 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3185 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3186 if (fs.is_contended()) {
3187 fac_contended.count[atype]++;
3188 if (!fs.access_flags().is_static()) {
3189 nonstatic_contended_count++;
3190 }
3191 }
3192 }
3195 // Calculate the starting byte offsets
3196 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3197 next_static_double_offset = next_static_oop_offset +
3198 ((fac->count[STATIC_OOP]) * heapOopSize);
3199 if ( fac->count[STATIC_DOUBLE] &&
3200 (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3201 Universe::field_type_should_be_aligned(T_LONG)) ) {
3202 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3203 }
3205 next_static_word_offset = next_static_double_offset +
3206 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3207 next_static_short_offset = next_static_word_offset +
3208 ((fac->count[STATIC_WORD]) * BytesPerInt);
3209 next_static_byte_offset = next_static_short_offset +
3210 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3212 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3213 nonstatic_field_size * heapOopSize;
3215 next_nonstatic_field_offset = nonstatic_fields_start;
3217 bool is_contended_class = parsed_annotations->is_contended();
3219 // Class is contended, pad before all the fields
3220 if (is_contended_class) {
3221 next_nonstatic_field_offset += ContendedPaddingWidth;
3222 }
3224 // Compute the non-contended fields count.
3225 // The packing code below relies on these counts to determine if some field
3226 // can be squeezed into the alignment gap. Contended fields are obviously
3227 // exempt from that.
3228 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3229 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3230 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3231 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3232 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3234 // Total non-static fields count, including every contended field
3235 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3236 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3237 fac->count[NONSTATIC_OOP];
3239 bool super_has_nonstatic_fields =
3240 (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3241 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3244 // Prepare list of oops for oop map generation.
3245 //
3246 // "offset" and "count" lists are describing the set of contiguous oop
3247 // regions. offset[i] is the start of the i-th region, which then has
3248 // count[i] oops following. Before we know how many regions are required,
3249 // we pessimistically allocate the maps to fit all the oops into the
3250 // distinct regions.
3251 //
3252 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3253 // to figure out if we still need to do this.
3254 int* nonstatic_oop_offsets;
3255 unsigned int* nonstatic_oop_counts;
3256 unsigned int nonstatic_oop_map_count = 0;
3257 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3259 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3260 THREAD, int, max_nonstatic_oop_maps);
3261 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3262 THREAD, unsigned int, max_nonstatic_oop_maps);
3264 first_nonstatic_oop_offset = 0; // will be set for first oop field
3266 bool compact_fields = CompactFields;
3267 int allocation_style = FieldsAllocationStyle;
3268 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3269 assert(false, "0 <= FieldsAllocationStyle <= 2");
3270 allocation_style = 1; // Optimistic
3271 }
3273 // The next classes have predefined hard-coded fields offsets
3274 // (see in JavaClasses::compute_hard_coded_offsets()).
3275 // Use default fields allocation order for them.
3276 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3277 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3278 _class_name == vmSymbols::java_lang_Class() ||
3279 _class_name == vmSymbols::java_lang_ClassLoader() ||
3280 _class_name == vmSymbols::java_lang_ref_Reference() ||
3281 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3282 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3283 _class_name == vmSymbols::java_lang_String() ||
3284 _class_name == vmSymbols::java_lang_Throwable() ||
3285 _class_name == vmSymbols::java_lang_Boolean() ||
3286 _class_name == vmSymbols::java_lang_Character() ||
3287 _class_name == vmSymbols::java_lang_Float() ||
3288 _class_name == vmSymbols::java_lang_Double() ||
3289 _class_name == vmSymbols::java_lang_Byte() ||
3290 _class_name == vmSymbols::java_lang_Short() ||
3291 _class_name == vmSymbols::java_lang_Integer() ||
3292 _class_name == vmSymbols::java_lang_Long())) {
3293 allocation_style = 0; // Allocate oops first
3294 compact_fields = false; // Don't compact fields
3295 }
3297 // Rearrange fields for a given allocation style
3298 if( allocation_style == 0 ) {
3299 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3300 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3301 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3302 (nonstatic_oop_count * heapOopSize);
3303 } else if( allocation_style == 1 ) {
3304 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3305 next_nonstatic_double_offset = next_nonstatic_field_offset;
3306 } else if( allocation_style == 2 ) {
3307 // Fields allocation: oops fields in super and sub classes are together.
3308 if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3309 _super_klass->nonstatic_oop_map_size() > 0 ) {
3310 unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3311 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3312 OopMapBlock* last_map = first_map + map_count - 1;
3313 int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3314 if (next_offset == next_nonstatic_field_offset) {
3315 allocation_style = 0; // allocate oops first
3316 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3317 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3318 (nonstatic_oop_count * heapOopSize);
3319 }
3320 }
3321 if( allocation_style == 2 ) {
3322 allocation_style = 1; // allocate oops last
3323 next_nonstatic_double_offset = next_nonstatic_field_offset;
3324 }
3325 } else {
3326 ShouldNotReachHere();
3327 }
3329 int nonstatic_oop_space_count = 0;
3330 int nonstatic_word_space_count = 0;
3331 int nonstatic_short_space_count = 0;
3332 int nonstatic_byte_space_count = 0;
3333 int nonstatic_oop_space_offset;
3334 int nonstatic_word_space_offset;
3335 int nonstatic_short_space_offset;
3336 int nonstatic_byte_space_offset;
3338 // Try to squeeze some of the fields into the gaps due to
3339 // long/double alignment.
3340 if( nonstatic_double_count > 0 ) {
3341 int offset = next_nonstatic_double_offset;
3342 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3343 if( compact_fields && offset != next_nonstatic_double_offset ) {
3344 // Allocate available fields into the gap before double field.
3345 int length = next_nonstatic_double_offset - offset;
3346 assert(length == BytesPerInt, "");
3347 nonstatic_word_space_offset = offset;
3348 if( nonstatic_word_count > 0 ) {
3349 nonstatic_word_count -= 1;
3350 nonstatic_word_space_count = 1; // Only one will fit
3351 length -= BytesPerInt;
3352 offset += BytesPerInt;
3353 }
3354 nonstatic_short_space_offset = offset;
3355 while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3356 nonstatic_short_count -= 1;
3357 nonstatic_short_space_count += 1;
3358 length -= BytesPerShort;
3359 offset += BytesPerShort;
3360 }
3361 nonstatic_byte_space_offset = offset;
3362 while( length > 0 && nonstatic_byte_count > 0 ) {
3363 nonstatic_byte_count -= 1;
3364 nonstatic_byte_space_count += 1;
3365 length -= 1;
3366 }
3367 // Allocate oop field in the gap if there are no other fields for that.
3368 nonstatic_oop_space_offset = offset;
3369 if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3370 allocation_style != 0 ) { // when oop fields not first
3371 nonstatic_oop_count -= 1;
3372 nonstatic_oop_space_count = 1; // Only one will fit
3373 length -= heapOopSize;
3374 offset += heapOopSize;
3375 }
3376 }
3377 }
3379 next_nonstatic_word_offset = next_nonstatic_double_offset +
3380 (nonstatic_double_count * BytesPerLong);
3381 next_nonstatic_short_offset = next_nonstatic_word_offset +
3382 (nonstatic_word_count * BytesPerInt);
3383 next_nonstatic_byte_offset = next_nonstatic_short_offset +
3384 (nonstatic_short_count * BytesPerShort);
3385 next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3386 nonstatic_byte_count;
3388 // let oops jump before padding with this allocation style
3389 if( allocation_style == 1 ) {
3390 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3391 if( nonstatic_oop_count > 0 ) {
3392 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3393 }
3394 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3395 }
3397 // Iterate over fields again and compute correct offsets.
3398 // The field allocation type was temporarily stored in the offset slot.
3399 // oop fields are located before non-oop fields (static and non-static).
3400 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3402 // skip already laid out fields
3403 if (fs.is_offset_set()) continue;
3405 // contended instance fields are handled below
3406 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3408 int real_offset;
3409 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3411 // pack the rest of the fields
3412 switch (atype) {
3413 case STATIC_OOP:
3414 real_offset = next_static_oop_offset;
3415 next_static_oop_offset += heapOopSize;
3416 break;
3417 case STATIC_BYTE:
3418 real_offset = next_static_byte_offset;
3419 next_static_byte_offset += 1;
3420 break;
3421 case STATIC_SHORT:
3422 real_offset = next_static_short_offset;
3423 next_static_short_offset += BytesPerShort;
3424 break;
3425 case STATIC_WORD:
3426 real_offset = next_static_word_offset;
3427 next_static_word_offset += BytesPerInt;
3428 break;
3429 case STATIC_DOUBLE:
3430 real_offset = next_static_double_offset;
3431 next_static_double_offset += BytesPerLong;
3432 break;
3433 case NONSTATIC_OOP:
3434 if( nonstatic_oop_space_count > 0 ) {
3435 real_offset = nonstatic_oop_space_offset;
3436 nonstatic_oop_space_offset += heapOopSize;
3437 nonstatic_oop_space_count -= 1;
3438 } else {
3439 real_offset = next_nonstatic_oop_offset;
3440 next_nonstatic_oop_offset += heapOopSize;
3441 }
3442 // Update oop maps
3443 if( nonstatic_oop_map_count > 0 &&
3444 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3445 real_offset -
3446 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3447 heapOopSize ) {
3448 // Extend current oop map
3449 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3450 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3451 } else {
3452 // Create new oop map
3453 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3454 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3455 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3456 nonstatic_oop_map_count += 1;
3457 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3458 first_nonstatic_oop_offset = real_offset;
3459 }
3460 }
3461 break;
3462 case NONSTATIC_BYTE:
3463 if( nonstatic_byte_space_count > 0 ) {
3464 real_offset = nonstatic_byte_space_offset;
3465 nonstatic_byte_space_offset += 1;
3466 nonstatic_byte_space_count -= 1;
3467 } else {
3468 real_offset = next_nonstatic_byte_offset;
3469 next_nonstatic_byte_offset += 1;
3470 }
3471 break;
3472 case NONSTATIC_SHORT:
3473 if( nonstatic_short_space_count > 0 ) {
3474 real_offset = nonstatic_short_space_offset;
3475 nonstatic_short_space_offset += BytesPerShort;
3476 nonstatic_short_space_count -= 1;
3477 } else {
3478 real_offset = next_nonstatic_short_offset;
3479 next_nonstatic_short_offset += BytesPerShort;
3480 }
3481 break;
3482 case NONSTATIC_WORD:
3483 if( nonstatic_word_space_count > 0 ) {
3484 real_offset = nonstatic_word_space_offset;
3485 nonstatic_word_space_offset += BytesPerInt;
3486 nonstatic_word_space_count -= 1;
3487 } else {
3488 real_offset = next_nonstatic_word_offset;
3489 next_nonstatic_word_offset += BytesPerInt;
3490 }
3491 break;
3492 case NONSTATIC_DOUBLE:
3493 real_offset = next_nonstatic_double_offset;
3494 next_nonstatic_double_offset += BytesPerLong;
3495 break;
3496 default:
3497 ShouldNotReachHere();
3498 }
3499 fs.set_offset(real_offset);
3500 }
3503 // Handle the contended cases.
3504 //
3505 // Each contended field should not intersect the cache line with another contended field.
3506 // In the absence of alignment information, we end up with pessimistically separating
3507 // the fields with full-width padding.
3508 //
3509 // Additionally, this should not break alignment for the fields, so we round the alignment up
3510 // for each field.
3511 if (nonstatic_contended_count > 0) {
3513 // if there is at least one contended field, we need to have pre-padding for them
3514 next_nonstatic_padded_offset += ContendedPaddingWidth;
3516 // collect all contended groups
3517 BitMap bm(_cp->size());
3518 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3519 // skip already laid out fields
3520 if (fs.is_offset_set()) continue;
3522 if (fs.is_contended()) {
3523 bm.set_bit(fs.contended_group());
3524 }
3525 }
3527 int current_group = -1;
3528 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3530 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3532 // skip already laid out fields
3533 if (fs.is_offset_set()) continue;
3535 // skip non-contended fields and fields from different group
3536 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3538 // handle statics below
3539 if (fs.access_flags().is_static()) continue;
3541 int real_offset;
3542 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3544 switch (atype) {
3545 case NONSTATIC_BYTE:
3546 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3547 real_offset = next_nonstatic_padded_offset;
3548 next_nonstatic_padded_offset += 1;
3549 break;
3551 case NONSTATIC_SHORT:
3552 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3553 real_offset = next_nonstatic_padded_offset;
3554 next_nonstatic_padded_offset += BytesPerShort;
3555 break;
3557 case NONSTATIC_WORD:
3558 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3559 real_offset = next_nonstatic_padded_offset;
3560 next_nonstatic_padded_offset += BytesPerInt;
3561 break;
3563 case NONSTATIC_DOUBLE:
3564 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3565 real_offset = next_nonstatic_padded_offset;
3566 next_nonstatic_padded_offset += BytesPerLong;
3567 break;
3569 case NONSTATIC_OOP:
3570 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3571 real_offset = next_nonstatic_padded_offset;
3572 next_nonstatic_padded_offset += heapOopSize;
3574 // Create new oop map
3575 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3576 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3577 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3578 nonstatic_oop_map_count += 1;
3579 if( first_nonstatic_oop_offset == 0 ) { // Undefined
3580 first_nonstatic_oop_offset = real_offset;
3581 }
3582 break;
3584 default:
3585 ShouldNotReachHere();
3586 }
3588 if (fs.contended_group() == 0) {
3589 // Contended group defines the equivalence class over the fields:
3590 // the fields within the same contended group are not inter-padded.
3591 // The only exception is default group, which does not incur the
3592 // equivalence, and so requires intra-padding.
3593 next_nonstatic_padded_offset += ContendedPaddingWidth;
3594 }
3596 fs.set_offset(real_offset);
3597 } // for
3599 // Start laying out the next group.
3600 // Note that this will effectively pad the last group in the back;
3601 // this is expected to alleviate memory contention effects for
3602 // subclass fields and/or adjacent object.
3603 // If this was the default group, the padding is already in place.
3604 if (current_group != 0) {
3605 next_nonstatic_padded_offset += ContendedPaddingWidth;
3606 }
3607 }
3609 // handle static fields
3610 }
3612 // Entire class is contended, pad in the back.
3613 // This helps to alleviate memory contention effects for subclass fields
3614 // and/or adjacent object.
3615 if (is_contended_class) {
3616 next_nonstatic_padded_offset += ContendedPaddingWidth;
3617 }
3619 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
3621 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
3622 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize);
3623 int static_fields_end = align_size_up(next_static_byte_offset, wordSize);
3625 int static_field_size = (static_fields_end -
3626 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3627 nonstatic_field_size = nonstatic_field_size +
3628 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
3630 int instance_size = align_object_size(instance_end / wordSize);
3632 assert(instance_size == align_object_size(align_size_up(
3633 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
3634 wordSize) / wordSize), "consistent layout helper value");
3636 // Invariant: nonstatic_field end/start should only change if there are
3637 // nonstatic fields in the class, or if the class is contended. We compare
3638 // against the non-aligned value, so that end alignment will not fail the
3639 // assert without actually having the fields.
3640 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
3641 is_contended_class ||
3642 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
3644 // Number of non-static oop map blocks allocated at end of klass.
3645 const unsigned int total_oop_map_count =
3646 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3647 first_nonstatic_oop_offset);
3649 #ifndef PRODUCT
3650 if (PrintFieldLayout) {
3651 print_field_layout(_class_name,
3652 _fields,
3653 _cp,
3654 instance_size,
3655 nonstatic_fields_start,
3656 nonstatic_fields_end,
3657 static_fields_end);
3658 }
3660 #endif
3661 // Pass back information needed for InstanceKlass creation
3662 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3663 info->nonstatic_oop_counts = nonstatic_oop_counts;
3664 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3665 info->total_oop_map_count = total_oop_map_count;
3666 info->instance_size = instance_size;
3667 info->static_field_size = static_field_size;
3668 info->nonstatic_field_size = nonstatic_field_size;
3669 info->has_nonstatic_fields = has_nonstatic_fields;
3670 }
3673 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3674 ClassLoaderData* loader_data,
3675 Handle protection_domain,
3676 KlassHandle host_klass,
3677 GrowableArray<Handle>* cp_patches,
3678 TempNewSymbol& parsed_name,
3679 bool verify,
3680 TRAPS) {
3682 // When a retransformable agent is attached, JVMTI caches the
3683 // class bytes that existed before the first retransformation.
3684 // If RedefineClasses() was used before the retransformable
3685 // agent attached, then the cached class bytes may not be the
3686 // original class bytes.
3687 JvmtiCachedClassFileData *cached_class_file = NULL;
3688 Handle class_loader(THREAD, loader_data->class_loader());
3689 bool has_default_methods = false;
3690 ResourceMark rm(THREAD);
3692 ClassFileStream* cfs = stream();
3693 // Timing
3694 assert(THREAD->is_Java_thread(), "must be a JavaThread");
3695 JavaThread* jt = (JavaThread*) THREAD;
3697 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3698 ClassLoader::perf_class_parse_selftime(),
3699 NULL,
3700 jt->get_thread_stat()->perf_recursion_counts_addr(),
3701 jt->get_thread_stat()->perf_timers_addr(),
3702 PerfClassTraceTime::PARSE_CLASS);
3704 init_parsed_class_attributes(loader_data);
3706 if (JvmtiExport::should_post_class_file_load_hook()) {
3707 // Get the cached class file bytes (if any) from the class that
3708 // is being redefined or retransformed. We use jvmti_thread_state()
3709 // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3710 // a JvmtiThreadState any earlier than necessary. This will help
3711 // avoid the bug described by 7126851.
3712 JvmtiThreadState *state = jt->jvmti_thread_state();
3713 if (state != NULL) {
3714 KlassHandle *h_class_being_redefined =
3715 state->get_class_being_redefined();
3716 if (h_class_being_redefined != NULL) {
3717 instanceKlassHandle ikh_class_being_redefined =
3718 instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3719 cached_class_file = ikh_class_being_redefined->get_cached_class_file();
3720 }
3721 }
3723 unsigned char* ptr = cfs->buffer();
3724 unsigned char* end_ptr = cfs->buffer() + cfs->length();
3726 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3727 &ptr, &end_ptr, &cached_class_file);
3729 if (ptr != cfs->buffer()) {
3730 // JVMTI agent has modified class file data.
3731 // Set new class file stream using JVMTI agent modified
3732 // class file data.
3733 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3734 set_stream(cfs);
3735 }
3736 }
3738 _host_klass = host_klass;
3739 _cp_patches = cp_patches;
3741 instanceKlassHandle nullHandle;
3743 // Figure out whether we can skip format checking (matching classic VM behavior)
3744 _need_verify = Verifier::should_verify_for(class_loader(), verify);
3746 // Set the verify flag in stream
3747 cfs->set_verify(_need_verify);
3749 // Save the class file name for easier error message printing.
3750 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3752 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
3753 // Magic value
3754 u4 magic = cfs->get_u4_fast();
3755 guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3756 "Incompatible magic value %u in class file %s",
3757 magic, CHECK_(nullHandle));
3759 // Version numbers
3760 u2 minor_version = cfs->get_u2_fast();
3761 u2 major_version = cfs->get_u2_fast();
3763 // Check version numbers - we check this even with verifier off
3764 if (!is_supported_version(major_version, minor_version)) {
3765 if (name == NULL) {
3766 Exceptions::fthrow(
3767 THREAD_AND_LOCATION,
3768 vmSymbols::java_lang_UnsupportedClassVersionError(),
3769 "Unsupported class file version %u.%u, "
3770 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3771 major_version,
3772 minor_version,
3773 JAVA_MAX_SUPPORTED_VERSION,
3774 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3775 } else {
3776 ResourceMark rm(THREAD);
3777 Exceptions::fthrow(
3778 THREAD_AND_LOCATION,
3779 vmSymbols::java_lang_UnsupportedClassVersionError(),
3780 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
3781 "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3782 name->as_C_string(),
3783 major_version,
3784 minor_version,
3785 JAVA_MAX_SUPPORTED_VERSION,
3786 JAVA_MAX_SUPPORTED_MINOR_VERSION);
3787 }
3788 return nullHandle;
3789 }
3791 _major_version = major_version;
3792 _minor_version = minor_version;
3795 // Check if verification needs to be relaxed for this class file
3796 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3797 _relax_verify = Verifier::relax_verify_for(class_loader());
3799 // Constant pool
3800 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3802 int cp_size = cp->length();
3804 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
3806 // Access flags
3807 AccessFlags access_flags;
3808 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3810 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3811 // Set abstract bit for old class files for backward compatibility
3812 flags |= JVM_ACC_ABSTRACT;
3813 }
3814 verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3815 access_flags.set_flags(flags);
3817 // This class and superclass
3818 u2 this_class_index = cfs->get_u2_fast();
3819 check_property(
3820 valid_cp_range(this_class_index, cp_size) &&
3821 cp->tag_at(this_class_index).is_unresolved_klass(),
3822 "Invalid this class index %u in constant pool in class file %s",
3823 this_class_index, CHECK_(nullHandle));
3825 Symbol* class_name = cp->unresolved_klass_at(this_class_index);
3826 assert(class_name != NULL, "class_name can't be null");
3828 // It's important to set parsed_name *before* resolving the super class.
3829 // (it's used for cleanup by the caller if parsing fails)
3830 parsed_name = class_name;
3831 // parsed_name is returned and can be used if there's an error, so add to
3832 // its reference count. Caller will decrement the refcount.
3833 parsed_name->increment_refcount();
3835 // Update _class_name which could be null previously to be class_name
3836 _class_name = class_name;
3838 // Don't need to check whether this class name is legal or not.
3839 // It has been checked when constant pool is parsed.
3840 // However, make sure it is not an array type.
3841 if (_need_verify) {
3842 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3843 "Bad class name in class file %s",
3844 CHECK_(nullHandle));
3845 }
3847 Klass* preserve_this_klass; // for storing result across HandleMark
3849 // release all handles when parsing is done
3850 { HandleMark hm(THREAD);
3852 // Checks if name in class file matches requested name
3853 if (name != NULL && class_name != name) {
3854 ResourceMark rm(THREAD);
3855 Exceptions::fthrow(
3856 THREAD_AND_LOCATION,
3857 vmSymbols::java_lang_NoClassDefFoundError(),
3858 "%s (wrong name: %s)",
3859 name->as_C_string(),
3860 class_name->as_C_string()
3861 );
3862 return nullHandle;
3863 }
3865 if (TraceClassLoadingPreorder) {
3866 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3867 if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3868 tty->print_cr("]");
3869 }
3871 u2 super_class_index = cfs->get_u2_fast();
3872 instanceKlassHandle super_klass = parse_super_class(super_class_index,
3873 CHECK_NULL);
3875 // Interfaces
3876 u2 itfs_len = cfs->get_u2_fast();
3877 Array<Klass*>* local_interfaces =
3878 parse_interfaces(itfs_len, protection_domain, _class_name,
3879 &has_default_methods, CHECK_(nullHandle));
3881 u2 java_fields_count = 0;
3882 // Fields (offsets are filled in later)
3883 FieldAllocationCount fac;
3884 Array<u2>* fields = parse_fields(class_name,
3885 access_flags.is_interface(),
3886 &fac, &java_fields_count,
3887 CHECK_(nullHandle));
3888 // Methods
3889 bool has_final_method = false;
3890 AccessFlags promoted_flags;
3891 promoted_flags.set_flags(0);
3892 Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3893 &promoted_flags,
3894 &has_final_method,
3895 &has_default_methods,
3896 CHECK_(nullHandle));
3898 // Additional attributes
3899 ClassAnnotationCollector parsed_annotations;
3900 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
3902 // Make sure this is the end of class file stream
3903 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3905 // We check super class after class file is parsed and format is checked
3906 if (super_class_index > 0 && super_klass.is_null()) {
3907 Symbol* sk = cp->klass_name_at(super_class_index);
3908 if (access_flags.is_interface()) {
3909 // Before attempting to resolve the superclass, check for class format
3910 // errors not checked yet.
3911 guarantee_property(sk == vmSymbols::java_lang_Object(),
3912 "Interfaces must have java.lang.Object as superclass in class file %s",
3913 CHECK_(nullHandle));
3914 }
3915 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
3916 class_loader,
3917 protection_domain,
3918 true,
3919 CHECK_(nullHandle));
3921 KlassHandle kh (THREAD, k);
3922 super_klass = instanceKlassHandle(THREAD, kh());
3923 }
3924 if (super_klass.not_null()) {
3926 if (super_klass->has_default_methods()) {
3927 has_default_methods = true;
3928 }
3930 if (super_klass->is_interface()) {
3931 ResourceMark rm(THREAD);
3932 Exceptions::fthrow(
3933 THREAD_AND_LOCATION,
3934 vmSymbols::java_lang_IncompatibleClassChangeError(),
3935 "class %s has interface %s as super class",
3936 class_name->as_klass_external_name(),
3937 super_klass->external_name()
3938 );
3939 return nullHandle;
3940 }
3941 // Make sure super class is not final
3942 if (super_klass->is_final()) {
3943 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
3944 }
3945 }
3947 // save super klass for error handling.
3948 _super_klass = super_klass;
3950 // Compute the transitive list of all unique interfaces implemented by this class
3951 _transitive_interfaces =
3952 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
3954 // sort methods
3955 intArray* method_ordering = sort_methods(methods);
3957 // promote flags from parse_methods() to the klass' flags
3958 access_flags.add_promoted_flags(promoted_flags.as_int());
3960 // Size of Java vtable (in words)
3961 int vtable_size = 0;
3962 int itable_size = 0;
3963 int num_miranda_methods = 0;
3965 GrowableArray<Method*> all_mirandas(20);
3967 klassVtable::compute_vtable_size_and_num_mirandas(
3968 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
3969 access_flags, class_loader, class_name, local_interfaces,
3970 CHECK_(nullHandle));
3972 // Size of Java itable (in words)
3973 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
3975 FieldLayoutInfo info;
3976 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
3978 int total_oop_map_size2 =
3979 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
3981 // Compute reference type
3982 ReferenceType rt;
3983 if (super_klass() == NULL) {
3984 rt = REF_NONE;
3985 } else {
3986 rt = super_klass->reference_type();
3987 }
3989 // We can now create the basic Klass* for this klass
3990 _klass = InstanceKlass::allocate_instance_klass(loader_data,
3991 vtable_size,
3992 itable_size,
3993 info.static_field_size,
3994 total_oop_map_size2,
3995 rt,
3996 access_flags,
3997 name,
3998 super_klass(),
3999 !host_klass.is_null(),
4000 CHECK_(nullHandle));
4001 instanceKlassHandle this_klass (THREAD, _klass);
4003 assert(this_klass->static_field_size() == info.static_field_size, "sanity");
4004 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
4005 "sanity");
4007 // Fill in information already parsed
4008 this_klass->set_should_verify_class(verify);
4009 jint lh = Klass::instance_layout_helper(info.instance_size, false);
4010 this_klass->set_layout_helper(lh);
4011 assert(this_klass->oop_is_instance(), "layout is correct");
4012 assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
4013 // Not yet: supers are done below to support the new subtype-checking fields
4014 //this_klass->set_super(super_klass());
4015 this_klass->set_class_loader_data(loader_data);
4016 this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
4017 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
4018 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
4020 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
4022 if (has_final_method) {
4023 this_klass->set_has_final_method();
4024 }
4025 this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
4026 // The InstanceKlass::_methods_jmethod_ids cache
4027 // is managed on the assumption that the initial cache
4028 // size is equal to the number of methods in the class. If
4029 // that changes, then InstanceKlass::idnum_can_increment()
4030 // has to be changed accordingly.
4031 this_klass->set_initial_method_idnum(methods->length());
4032 this_klass->set_name(cp->klass_name_at(this_class_index));
4033 if (is_anonymous()) // I am well known to myself
4034 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4036 this_klass->set_minor_version(minor_version);
4037 this_klass->set_major_version(major_version);
4038 this_klass->set_has_default_methods(has_default_methods);
4040 if (!host_klass.is_null()) {
4041 assert (this_klass->is_anonymous(), "should be the same");
4042 this_klass->set_host_klass(host_klass());
4043 }
4045 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4046 // (We used to do this lazily, but now we query it in Rewriter,
4047 // which is eagerly done for every method, so we might as well do it now,
4048 // when everything is fresh in memory.)
4049 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) {
4050 for (int j = 0; j < methods->length(); j++) {
4051 methods->at(j)->init_intrinsic_id();
4052 }
4053 }
4055 if (cached_class_file != NULL) {
4056 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4057 this_klass->set_cached_class_file(cached_class_file);
4058 }
4060 // Fill in field values obtained by parse_classfile_attributes
4061 if (parsed_annotations.has_any_annotations())
4062 parsed_annotations.apply_to(this_klass);
4063 apply_parsed_class_attributes(this_klass);
4065 // Miranda methods
4066 if ((num_miranda_methods > 0) ||
4067 // if this class introduced new miranda methods or
4068 (super_klass.not_null() && (super_klass->has_miranda_methods()))
4069 // super class exists and this class inherited miranda methods
4070 ) {
4071 this_klass->set_has_miranda_methods(); // then set a flag
4072 }
4074 // Fill in information needed to compute superclasses.
4075 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4077 // Initialize itable offset tables
4078 klassItable::setup_itable_offset_table(this_klass);
4080 // Compute transitive closure of interfaces this class implements
4081 // Do final class setup
4082 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4084 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4085 set_precomputed_flags(this_klass);
4087 // reinitialize modifiers, using the InnerClasses attribute
4088 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4089 this_klass->set_modifier_flags(computed_modifiers);
4091 // check if this class can access its super class
4092 check_super_class_access(this_klass, CHECK_(nullHandle));
4094 // check if this class can access its superinterfaces
4095 check_super_interface_access(this_klass, CHECK_(nullHandle));
4097 // check if this class overrides any final method
4098 check_final_method_override(this_klass, CHECK_(nullHandle));
4100 // check that if this class is an interface then it doesn't have static methods
4101 if (this_klass->is_interface()) {
4102 /* An interface in a JAVA 8 classfile can be static */
4103 if (_major_version < JAVA_8_VERSION) {
4104 check_illegal_static_method(this_klass, CHECK_(nullHandle));
4105 }
4106 }
4108 // Allocate mirror and initialize static fields
4109 java_lang_Class::create_mirror(this_klass, protection_domain, CHECK_(nullHandle));
4112 // Generate any default methods - default methods are interface methods
4113 // that have a default implementation. This is new with Lambda project.
4114 if (has_default_methods ) {
4115 DefaultMethods::generate_default_methods(
4116 this_klass(), &all_mirandas, CHECK_(nullHandle));
4117 }
4119 // Update the loader_data graph.
4120 record_defined_class_dependencies(this_klass, CHECK_NULL);
4122 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4123 false /* not shared class */);
4125 if (TraceClassLoading) {
4126 ResourceMark rm;
4127 // print in a single call to reduce interleaving of output
4128 if (cfs->source() != NULL) {
4129 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4130 cfs->source());
4131 } else if (class_loader.is_null()) {
4132 if (THREAD->is_Java_thread()) {
4133 Klass* caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
4134 tty->print("[Loaded %s by instance of %s]\n",
4135 this_klass->external_name(),
4136 InstanceKlass::cast(caller)->external_name());
4137 } else {
4138 tty->print("[Loaded %s]\n", this_klass->external_name());
4139 }
4140 } else {
4141 tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4142 InstanceKlass::cast(class_loader->klass())->external_name());
4143 }
4144 }
4146 if (TraceClassResolution) {
4147 ResourceMark rm;
4148 // print out the superclass.
4149 const char * from = this_klass()->external_name();
4150 if (this_klass->java_super() != NULL) {
4151 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4152 }
4153 // print out each of the interface classes referred to by this class.
4154 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4155 if (local_interfaces != NULL) {
4156 int length = local_interfaces->length();
4157 for (int i = 0; i < length; i++) {
4158 Klass* k = local_interfaces->at(i);
4159 InstanceKlass* to_class = InstanceKlass::cast(k);
4160 const char * to = to_class->external_name();
4161 tty->print("RESOLVE %s %s (interface)\n", from, to);
4162 }
4163 }
4164 }
4166 // preserve result across HandleMark
4167 preserve_this_klass = this_klass();
4168 }
4170 // Create new handle outside HandleMark (might be needed for
4171 // Extended Class Redefinition)
4172 instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4173 debug_only(this_klass->verify();)
4175 // Clear class if no error has occurred so destructor doesn't deallocate it
4176 _klass = NULL;
4177 return this_klass;
4178 }
4180 // Destructor to clean up if there's an error
4181 ClassFileParser::~ClassFileParser() {
4182 MetadataFactory::free_metadata(_loader_data, _cp);
4183 MetadataFactory::free_array<u2>(_loader_data, _fields);
4185 // Free methods
4186 InstanceKlass::deallocate_methods(_loader_data, _methods);
4188 // beware of the Universe::empty_blah_array!!
4189 if (_inner_classes != Universe::the_empty_short_array()) {
4190 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4191 }
4193 // Free interfaces
4194 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4195 _local_interfaces, _transitive_interfaces);
4197 MetadataFactory::free_array<u1>(_loader_data, _annotations);
4198 MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4199 Annotations::free_contents(_loader_data, _fields_annotations);
4200 Annotations::free_contents(_loader_data, _fields_type_annotations);
4202 clear_class_metadata();
4204 // deallocate the klass if already created. Don't directly deallocate, but add
4205 // to the deallocate list so that the klass is removed from the CLD::_klasses list
4206 // at a safepoint.
4207 if (_klass != NULL) {
4208 _loader_data->add_to_deallocate_list(_klass);
4209 }
4210 _klass = NULL;
4211 }
4213 void ClassFileParser::print_field_layout(Symbol* name,
4214 Array<u2>* fields,
4215 constantPoolHandle cp,
4216 int instance_size,
4217 int instance_fields_start,
4218 int instance_fields_end,
4219 int static_fields_end) {
4220 tty->print("%s: field layout\n", name->as_klass_external_name());
4221 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4222 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4223 if (!fs.access_flags().is_static()) {
4224 tty->print(" @%3d \"%s\" %s\n",
4225 fs.offset(),
4226 fs.name()->as_klass_external_name(),
4227 fs.signature()->as_klass_external_name());
4228 }
4229 }
4230 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4231 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4232 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4233 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4234 if (fs.access_flags().is_static()) {
4235 tty->print(" @%3d \"%s\" %s\n",
4236 fs.offset(),
4237 fs.name()->as_klass_external_name(),
4238 fs.signature()->as_klass_external_name());
4239 }
4240 }
4241 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
4242 tty->print("\n");
4243 }
4245 unsigned int
4246 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4247 unsigned int nonstatic_oop_map_count,
4248 int first_nonstatic_oop_offset) {
4249 unsigned int map_count =
4250 super.is_null() ? 0 : super->nonstatic_oop_map_count();
4251 if (nonstatic_oop_map_count > 0) {
4252 // We have oops to add to map
4253 if (map_count == 0) {
4254 map_count = nonstatic_oop_map_count;
4255 } else {
4256 // Check whether we should add a new map block or whether the last one can
4257 // be extended
4258 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4259 OopMapBlock* const last_map = first_map + map_count - 1;
4261 int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4262 if (next_offset == first_nonstatic_oop_offset) {
4263 // There is no gap bettwen superklass's last oop field and first
4264 // local oop field, merge maps.
4265 nonstatic_oop_map_count -= 1;
4266 } else {
4267 // Superklass didn't end with a oop field, add extra maps
4268 assert(next_offset < first_nonstatic_oop_offset, "just checking");
4269 }
4270 map_count += nonstatic_oop_map_count;
4271 }
4272 }
4273 return map_count;
4274 }
4277 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4278 unsigned int nonstatic_oop_map_count,
4279 int* nonstatic_oop_offsets,
4280 unsigned int* nonstatic_oop_counts) {
4281 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4282 const InstanceKlass* const super = k->superklass();
4283 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4284 if (super_count > 0) {
4285 // Copy maps from superklass
4286 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4287 for (unsigned int i = 0; i < super_count; ++i) {
4288 *this_oop_map++ = *super_oop_map++;
4289 }
4290 }
4292 if (nonstatic_oop_map_count > 0) {
4293 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4294 // The counts differ because there is no gap between superklass's last oop
4295 // field and the first local oop field. Extend the last oop map copied
4296 // from the superklass instead of creating new one.
4297 nonstatic_oop_map_count--;
4298 nonstatic_oop_offsets++;
4299 this_oop_map--;
4300 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4301 this_oop_map++;
4302 }
4304 // Add new map blocks, fill them
4305 while (nonstatic_oop_map_count-- > 0) {
4306 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4307 this_oop_map->set_count(*nonstatic_oop_counts++);
4308 this_oop_map++;
4309 }
4310 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4311 this_oop_map, "sanity");
4312 }
4313 }
4316 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4317 Klass* super = k->super();
4319 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4320 // in which case we don't have to register objects as finalizable
4321 if (!_has_empty_finalizer) {
4322 if (_has_finalizer ||
4323 (super != NULL && super->has_finalizer())) {
4324 k->set_has_finalizer();
4325 }
4326 }
4328 #ifdef ASSERT
4329 bool f = false;
4330 Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4331 vmSymbols::void_method_signature());
4332 if (m != NULL && !m->is_empty_method()) {
4333 f = true;
4334 }
4335 assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4336 #endif
4338 // Check if this klass supports the java.lang.Cloneable interface
4339 if (SystemDictionary::Cloneable_klass_loaded()) {
4340 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4341 k->set_is_cloneable();
4342 }
4343 }
4345 // Check if this klass has a vanilla default constructor
4346 if (super == NULL) {
4347 // java.lang.Object has empty default constructor
4348 k->set_has_vanilla_constructor();
4349 } else {
4350 if (super->has_vanilla_constructor() &&
4351 _has_vanilla_constructor) {
4352 k->set_has_vanilla_constructor();
4353 }
4354 #ifdef ASSERT
4355 bool v = false;
4356 if (super->has_vanilla_constructor()) {
4357 Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4358 ), vmSymbols::void_method_signature());
4359 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4360 v = true;
4361 }
4362 }
4363 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4364 #endif
4365 }
4367 // If it cannot be fast-path allocated, set a bit in the layout helper.
4368 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4369 assert(k->size_helper() > 0, "layout_helper is initialized");
4370 if ((!RegisterFinalizersAtInit && k->has_finalizer())
4371 || k->is_abstract() || k->is_interface()
4372 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4373 || k->size_helper() >= FastAllocateSizeLimit) {
4374 // Forbid fast-path allocation.
4375 jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4376 k->set_layout_helper(lh);
4377 }
4378 }
4380 // Attach super classes and interface classes to class loader data
4381 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4382 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4383 if (defining_loader_data->is_the_null_class_loader_data()) {
4384 // Dependencies to null class loader data are implicit.
4385 return;
4386 } else {
4387 // add super class dependency
4388 Klass* super = defined_klass->super();
4389 if (super != NULL) {
4390 defining_loader_data->record_dependency(super, CHECK);
4391 }
4393 // add super interface dependencies
4394 Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4395 if (local_interfaces != NULL) {
4396 int length = local_interfaces->length();
4397 for (int i = 0; i < length; i++) {
4398 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4399 }
4400 }
4401 }
4402 }
4404 // utility methods for appending an array with check for duplicates
4406 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4407 // iterate over new interfaces
4408 for (int i = 0; i < ifs->length(); i++) {
4409 Klass* e = ifs->at(i);
4410 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4411 // add new interface
4412 result->append_if_missing(e);
4413 }
4414 }
4416 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4417 instanceKlassHandle super,
4418 Array<Klass*>* local_ifs, TRAPS) {
4419 // Compute maximum size for transitive interfaces
4420 int max_transitive_size = 0;
4421 int super_size = 0;
4422 // Add superclass transitive interfaces size
4423 if (super.not_null()) {
4424 super_size = super->transitive_interfaces()->length();
4425 max_transitive_size += super_size;
4426 }
4427 // Add local interfaces' super interfaces
4428 int local_size = local_ifs->length();
4429 for (int i = 0; i < local_size; i++) {
4430 Klass* l = local_ifs->at(i);
4431 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4432 }
4433 // Finally add local interfaces
4434 max_transitive_size += local_size;
4435 // Construct array
4436 if (max_transitive_size == 0) {
4437 // no interfaces, use canonicalized array
4438 return Universe::the_empty_klass_array();
4439 } else if (max_transitive_size == super_size) {
4440 // no new local interfaces added, share superklass' transitive interface array
4441 return super->transitive_interfaces();
4442 } else if (max_transitive_size == local_size) {
4443 // only local interfaces added, share local interface array
4444 return local_ifs;
4445 } else {
4446 ResourceMark rm;
4447 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4449 // Copy down from superclass
4450 if (super.not_null()) {
4451 append_interfaces(result, super->transitive_interfaces());
4452 }
4454 // Copy down from local interfaces' superinterfaces
4455 for (int i = 0; i < local_ifs->length(); i++) {
4456 Klass* l = local_ifs->at(i);
4457 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4458 }
4459 // Finally add local interfaces
4460 append_interfaces(result, local_ifs);
4462 // length will be less than the max_transitive_size if duplicates were removed
4463 int length = result->length();
4464 assert(length <= max_transitive_size, "just checking");
4465 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4466 for (int i = 0; i < length; i++) {
4467 Klass* e = result->at(i);
4468 assert(e != NULL, "just checking");
4469 new_result->at_put(i, e);
4470 }
4471 return new_result;
4472 }
4473 }
4475 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4476 Klass* super = this_klass->super();
4477 if ((super != NULL) &&
4478 (!Reflection::verify_class_access(this_klass(), super, false))) {
4479 ResourceMark rm(THREAD);
4480 Exceptions::fthrow(
4481 THREAD_AND_LOCATION,
4482 vmSymbols::java_lang_IllegalAccessError(),
4483 "class %s cannot access its superclass %s",
4484 this_klass->external_name(),
4485 InstanceKlass::cast(super)->external_name()
4486 );
4487 return;
4488 }
4489 }
4492 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4493 Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4494 int lng = local_interfaces->length();
4495 for (int i = lng - 1; i >= 0; i--) {
4496 Klass* k = local_interfaces->at(i);
4497 assert (k != NULL && k->is_interface(), "invalid interface");
4498 if (!Reflection::verify_class_access(this_klass(), k, false)) {
4499 ResourceMark rm(THREAD);
4500 Exceptions::fthrow(
4501 THREAD_AND_LOCATION,
4502 vmSymbols::java_lang_IllegalAccessError(),
4503 "class %s cannot access its superinterface %s",
4504 this_klass->external_name(),
4505 InstanceKlass::cast(k)->external_name()
4506 );
4507 return;
4508 }
4509 }
4510 }
4513 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4514 Array<Method*>* methods = this_klass->methods();
4515 int num_methods = methods->length();
4517 // go thru each method and check if it overrides a final method
4518 for (int index = 0; index < num_methods; index++) {
4519 Method* m = methods->at(index);
4521 // skip private, static, and <init> methods
4522 if ((!m->is_private() && !m->is_static()) &&
4523 (m->name() != vmSymbols::object_initializer_name())) {
4525 Symbol* name = m->name();
4526 Symbol* signature = m->signature();
4527 Klass* k = this_klass->super();
4528 Method* super_m = NULL;
4529 while (k != NULL) {
4530 // skip supers that don't have final methods.
4531 if (k->has_final_method()) {
4532 // lookup a matching method in the super class hierarchy
4533 super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4534 if (super_m == NULL) {
4535 break; // didn't find any match; get out
4536 }
4538 if (super_m->is_final() && !super_m->is_static() &&
4539 // matching method in super is final, and not static
4540 (Reflection::verify_field_access(this_klass(),
4541 super_m->method_holder(),
4542 super_m->method_holder(),
4543 super_m->access_flags(), false))
4544 // this class can access super final method and therefore override
4545 ) {
4546 ResourceMark rm(THREAD);
4547 Exceptions::fthrow(
4548 THREAD_AND_LOCATION,
4549 vmSymbols::java_lang_VerifyError(),
4550 "class %s overrides final method %s.%s",
4551 this_klass->external_name(),
4552 name->as_C_string(),
4553 signature->as_C_string()
4554 );
4555 return;
4556 }
4558 // continue to look from super_m's holder's super.
4559 k = super_m->method_holder()->super();
4560 continue;
4561 }
4563 k = k->super();
4564 }
4565 }
4566 }
4567 }
4570 // assumes that this_klass is an interface
4571 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4572 assert(this_klass->is_interface(), "not an interface");
4573 Array<Method*>* methods = this_klass->methods();
4574 int num_methods = methods->length();
4576 for (int index = 0; index < num_methods; index++) {
4577 Method* m = methods->at(index);
4578 // if m is static and not the init method, throw a verify error
4579 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4580 ResourceMark rm(THREAD);
4581 Exceptions::fthrow(
4582 THREAD_AND_LOCATION,
4583 vmSymbols::java_lang_VerifyError(),
4584 "Illegal static method %s in interface %s",
4585 m->name()->as_C_string(),
4586 this_klass->external_name()
4587 );
4588 return;
4589 }
4590 }
4591 }
4593 // utility methods for format checking
4595 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4596 if (!_need_verify) { return; }
4598 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4599 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4600 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4601 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4602 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4603 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4604 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4606 if ((is_abstract && is_final) ||
4607 (is_interface && !is_abstract) ||
4608 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4609 (!is_interface && major_gte_15 && is_annotation)) {
4610 ResourceMark rm(THREAD);
4611 Exceptions::fthrow(
4612 THREAD_AND_LOCATION,
4613 vmSymbols::java_lang_ClassFormatError(),
4614 "Illegal class modifiers in class %s: 0x%X",
4615 _class_name->as_C_string(), flags
4616 );
4617 return;
4618 }
4619 }
4621 bool ClassFileParser::has_illegal_visibility(jint flags) {
4622 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4623 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4624 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4626 return ((is_public && is_protected) ||
4627 (is_public && is_private) ||
4628 (is_protected && is_private));
4629 }
4631 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4632 u2 max_version =
4633 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4634 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4635 return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4636 (major <= max_version) &&
4637 ((major != max_version) ||
4638 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4639 }
4641 void ClassFileParser::verify_legal_field_modifiers(
4642 jint flags, bool is_interface, TRAPS) {
4643 if (!_need_verify) { return; }
4645 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4646 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4647 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4648 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4649 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4650 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4651 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4652 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4653 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4655 bool is_illegal = false;
4657 if (is_interface) {
4658 if (!is_public || !is_static || !is_final || is_private ||
4659 is_protected || is_volatile || is_transient ||
4660 (major_gte_15 && is_enum)) {
4661 is_illegal = true;
4662 }
4663 } else { // not interface
4664 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4665 is_illegal = true;
4666 }
4667 }
4669 if (is_illegal) {
4670 ResourceMark rm(THREAD);
4671 Exceptions::fthrow(
4672 THREAD_AND_LOCATION,
4673 vmSymbols::java_lang_ClassFormatError(),
4674 "Illegal field modifiers in class %s: 0x%X",
4675 _class_name->as_C_string(), flags);
4676 return;
4677 }
4678 }
4680 void ClassFileParser::verify_legal_method_modifiers(
4681 jint flags, bool is_interface, Symbol* name, TRAPS) {
4682 if (!_need_verify) { return; }
4684 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4685 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4686 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4687 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4688 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4689 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4690 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4691 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4692 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4693 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4694 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4695 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4696 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4698 bool is_illegal = false;
4700 if (is_interface) {
4701 if (major_gte_8) {
4702 // Class file version is JAVA_8_VERSION or later Methods of
4703 // interfaces may set any of the flags except ACC_PROTECTED,
4704 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4705 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4706 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4707 (is_native || is_protected || is_final || is_synchronized) ||
4708 // If a specific method of a class or interface has its
4709 // ACC_ABSTRACT flag set, it must not have any of its
4710 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4711 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4712 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4713 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4714 (is_abstract && (is_private || is_static || is_strict))) {
4715 is_illegal = true;
4716 }
4717 } else if (major_gte_15) {
4718 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4719 if (!is_public || is_static || is_final || is_synchronized ||
4720 is_native || !is_abstract || is_strict) {
4721 is_illegal = true;
4722 }
4723 } else {
4724 // Class file version is pre-JAVA_1_5_VERSION
4725 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4726 is_illegal = true;
4727 }
4728 }
4729 } else { // not interface
4730 if (is_initializer) {
4731 if (is_static || is_final || is_synchronized || is_native ||
4732 is_abstract || (major_gte_15 && is_bridge)) {
4733 is_illegal = true;
4734 }
4735 } else { // not initializer
4736 if (is_abstract) {
4737 if ((is_final || is_native || is_private || is_static ||
4738 (major_gte_15 && (is_synchronized || is_strict)))) {
4739 is_illegal = true;
4740 }
4741 }
4742 if (has_illegal_visibility(flags)) {
4743 is_illegal = true;
4744 }
4745 }
4746 }
4748 if (is_illegal) {
4749 ResourceMark rm(THREAD);
4750 Exceptions::fthrow(
4751 THREAD_AND_LOCATION,
4752 vmSymbols::java_lang_ClassFormatError(),
4753 "Method %s in class %s has illegal modifiers: 0x%X",
4754 name->as_C_string(), _class_name->as_C_string(), flags);
4755 return;
4756 }
4757 }
4759 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4760 assert(_need_verify, "only called when _need_verify is true");
4761 int i = 0;
4762 int count = length >> 2;
4763 for (int k=0; k<count; k++) {
4764 unsigned char b0 = buffer[i];
4765 unsigned char b1 = buffer[i+1];
4766 unsigned char b2 = buffer[i+2];
4767 unsigned char b3 = buffer[i+3];
4768 // For an unsigned char v,
4769 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4770 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4771 unsigned char res = b0 | b0 - 1 |
4772 b1 | b1 - 1 |
4773 b2 | b2 - 1 |
4774 b3 | b3 - 1;
4775 if (res >= 128) break;
4776 i += 4;
4777 }
4778 for(; i < length; i++) {
4779 unsigned short c;
4780 // no embedded zeros
4781 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4782 if(buffer[i] < 128) {
4783 continue;
4784 }
4785 if ((i + 5) < length) { // see if it's legal supplementary character
4786 if (UTF8::is_supplementary_character(&buffer[i])) {
4787 c = UTF8::get_supplementary_character(&buffer[i]);
4788 i += 5;
4789 continue;
4790 }
4791 }
4792 switch (buffer[i] >> 4) {
4793 default: break;
4794 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4795 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4796 case 0xC: case 0xD: // 110xxxxx 10xxxxxx
4797 c = (buffer[i] & 0x1F) << 6;
4798 i++;
4799 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4800 c += buffer[i] & 0x3F;
4801 if (_major_version <= 47 || c == 0 || c >= 0x80) {
4802 // for classes with major > 47, c must a null or a character in its shortest form
4803 break;
4804 }
4805 }
4806 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4807 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
4808 c = (buffer[i] & 0xF) << 12;
4809 i += 2;
4810 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4811 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4812 if (_major_version <= 47 || c >= 0x800) {
4813 // for classes with major > 47, c must be in its shortest form
4814 break;
4815 }
4816 }
4817 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4818 } // end of switch
4819 } // end of for
4820 }
4822 // Checks if name is a legal class name.
4823 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4824 if (!_need_verify || _relax_verify) { return; }
4826 char buf[fixed_buffer_size];
4827 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4828 unsigned int length = name->utf8_length();
4829 bool legal = false;
4831 if (length > 0) {
4832 char* p;
4833 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4834 p = skip_over_field_signature(bytes, false, length, CHECK);
4835 legal = (p != NULL) && ((p - bytes) == (int)length);
4836 } else if (_major_version < JAVA_1_5_VERSION) {
4837 if (bytes[0] != '<') {
4838 p = skip_over_field_name(bytes, true, length);
4839 legal = (p != NULL) && ((p - bytes) == (int)length);
4840 }
4841 } else {
4842 // 4900761: relax the constraints based on JSR202 spec
4843 // Class names may be drawn from the entire Unicode character set.
4844 // Identifiers between '/' must be unqualified names.
4845 // The utf8 string has been verified when parsing cpool entries.
4846 legal = verify_unqualified_name(bytes, length, LegalClass);
4847 }
4848 }
4849 if (!legal) {
4850 ResourceMark rm(THREAD);
4851 Exceptions::fthrow(
4852 THREAD_AND_LOCATION,
4853 vmSymbols::java_lang_ClassFormatError(),
4854 "Illegal class name \"%s\" in class file %s", bytes,
4855 _class_name->as_C_string()
4856 );
4857 return;
4858 }
4859 }
4861 // Checks if name is a legal field name.
4862 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4863 if (!_need_verify || _relax_verify) { return; }
4865 char buf[fixed_buffer_size];
4866 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4867 unsigned int length = name->utf8_length();
4868 bool legal = false;
4870 if (length > 0) {
4871 if (_major_version < JAVA_1_5_VERSION) {
4872 if (bytes[0] != '<') {
4873 char* p = skip_over_field_name(bytes, false, length);
4874 legal = (p != NULL) && ((p - bytes) == (int)length);
4875 }
4876 } else {
4877 // 4881221: relax the constraints based on JSR202 spec
4878 legal = verify_unqualified_name(bytes, length, LegalField);
4879 }
4880 }
4882 if (!legal) {
4883 ResourceMark rm(THREAD);
4884 Exceptions::fthrow(
4885 THREAD_AND_LOCATION,
4886 vmSymbols::java_lang_ClassFormatError(),
4887 "Illegal field name \"%s\" in class %s", bytes,
4888 _class_name->as_C_string()
4889 );
4890 return;
4891 }
4892 }
4894 // Checks if name is a legal method name.
4895 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4896 if (!_need_verify || _relax_verify) { return; }
4898 assert(name != NULL, "method name is null");
4899 char buf[fixed_buffer_size];
4900 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4901 unsigned int length = name->utf8_length();
4902 bool legal = false;
4904 if (length > 0) {
4905 if (bytes[0] == '<') {
4906 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4907 legal = true;
4908 }
4909 } else if (_major_version < JAVA_1_5_VERSION) {
4910 char* p;
4911 p = skip_over_field_name(bytes, false, length);
4912 legal = (p != NULL) && ((p - bytes) == (int)length);
4913 } else {
4914 // 4881221: relax the constraints based on JSR202 spec
4915 legal = verify_unqualified_name(bytes, length, LegalMethod);
4916 }
4917 }
4919 if (!legal) {
4920 ResourceMark rm(THREAD);
4921 Exceptions::fthrow(
4922 THREAD_AND_LOCATION,
4923 vmSymbols::java_lang_ClassFormatError(),
4924 "Illegal method name \"%s\" in class %s", bytes,
4925 _class_name->as_C_string()
4926 );
4927 return;
4928 }
4929 }
4932 // Checks if signature is a legal field signature.
4933 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
4934 if (!_need_verify) { return; }
4936 char buf[fixed_buffer_size];
4937 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4938 unsigned int length = signature->utf8_length();
4939 char* p = skip_over_field_signature(bytes, false, length, CHECK);
4941 if (p == NULL || (p - bytes) != (int)length) {
4942 throwIllegalSignature("Field", name, signature, CHECK);
4943 }
4944 }
4946 // Checks if signature is a legal method signature.
4947 // Returns number of parameters
4948 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
4949 if (!_need_verify) {
4950 // make sure caller's args_size will be less than 0 even for non-static
4951 // method so it will be recomputed in compute_size_of_parameters().
4952 return -2;
4953 }
4955 unsigned int args_size = 0;
4956 char buf[fixed_buffer_size];
4957 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4958 unsigned int length = signature->utf8_length();
4959 char* nextp;
4961 // The first character must be a '('
4962 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4963 length--;
4964 // Skip over legal field signatures
4965 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4966 while ((length > 0) && (nextp != NULL)) {
4967 args_size++;
4968 if (p[0] == 'J' || p[0] == 'D') {
4969 args_size++;
4970 }
4971 length -= nextp - p;
4972 p = nextp;
4973 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4974 }
4975 // The first non-signature thing better be a ')'
4976 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4977 length--;
4978 if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4979 // All internal methods must return void
4980 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4981 return args_size;
4982 }
4983 } else {
4984 // Now we better just have a return value
4985 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4986 if (nextp && ((int)length == (nextp - p))) {
4987 return args_size;
4988 }
4989 }
4990 }
4991 }
4992 // Report error
4993 throwIllegalSignature("Method", name, signature, CHECK_0);
4994 return 0;
4995 }
4998 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4999 // Method names also may not contain the characters '<' or '>', unless <init>
5000 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5001 // method. Because these names have been checked as special cases before
5002 // calling this method in verify_legal_method_name.
5003 bool ClassFileParser::verify_unqualified_name(
5004 char* name, unsigned int length, int type) {
5005 jchar ch;
5007 for (char* p = name; p != name + length; ) {
5008 ch = *p;
5009 if (ch < 128) {
5010 p++;
5011 if (ch == '.' || ch == ';' || ch == '[' ) {
5012 return false; // do not permit '.', ';', or '['
5013 }
5014 if (type != LegalClass && ch == '/') {
5015 return false; // do not permit '/' unless it's class name
5016 }
5017 if (type == LegalMethod && (ch == '<' || ch == '>')) {
5018 return false; // do not permit '<' or '>' in method names
5019 }
5020 } else {
5021 char* tmp_p = UTF8::next(p, &ch);
5022 p = tmp_p;
5023 }
5024 }
5025 return true;
5026 }
5029 // Take pointer to a string. Skip over the longest part of the string that could
5030 // be taken as a fieldname. Allow '/' if slash_ok is true.
5031 // Return a pointer to just past the fieldname.
5032 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5033 // being true, we saw consecutive slashes (meaning we were looking for a
5034 // qualified path but found something that was badly-formed).
5035 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5036 char* p;
5037 jchar ch;
5038 jboolean last_is_slash = false;
5039 jboolean not_first_ch = false;
5041 for (p = name; p != name + length; not_first_ch = true) {
5042 char* old_p = p;
5043 ch = *p;
5044 if (ch < 128) {
5045 p++;
5046 // quick check for ascii
5047 if ((ch >= 'a' && ch <= 'z') ||
5048 (ch >= 'A' && ch <= 'Z') ||
5049 (ch == '_' || ch == '$') ||
5050 (not_first_ch && ch >= '0' && ch <= '9')) {
5051 last_is_slash = false;
5052 continue;
5053 }
5054 if (slash_ok && ch == '/') {
5055 if (last_is_slash) {
5056 return NULL; // Don't permit consecutive slashes
5057 }
5058 last_is_slash = true;
5059 continue;
5060 }
5061 } else {
5062 jint unicode_ch;
5063 char* tmp_p = UTF8::next_character(p, &unicode_ch);
5064 p = tmp_p;
5065 last_is_slash = false;
5066 // Check if ch is Java identifier start or is Java identifier part
5067 // 4672820: call java.lang.Character methods directly without generating separate tables.
5068 EXCEPTION_MARK;
5069 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5071 // return value
5072 JavaValue result(T_BOOLEAN);
5073 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5074 JavaCallArguments args;
5075 args.push_int(unicode_ch);
5077 // public static boolean isJavaIdentifierStart(char ch);
5078 JavaCalls::call_static(&result,
5079 klass,
5080 vmSymbols::isJavaIdentifierStart_name(),
5081 vmSymbols::int_bool_signature(),
5082 &args,
5083 THREAD);
5085 if (HAS_PENDING_EXCEPTION) {
5086 CLEAR_PENDING_EXCEPTION;
5087 return 0;
5088 }
5089 if (result.get_jboolean()) {
5090 continue;
5091 }
5093 if (not_first_ch) {
5094 // public static boolean isJavaIdentifierPart(char ch);
5095 JavaCalls::call_static(&result,
5096 klass,
5097 vmSymbols::isJavaIdentifierPart_name(),
5098 vmSymbols::int_bool_signature(),
5099 &args,
5100 THREAD);
5102 if (HAS_PENDING_EXCEPTION) {
5103 CLEAR_PENDING_EXCEPTION;
5104 return 0;
5105 }
5107 if (result.get_jboolean()) {
5108 continue;
5109 }
5110 }
5111 }
5112 return (not_first_ch) ? old_p : NULL;
5113 }
5114 return (not_first_ch) ? p : NULL;
5115 }
5118 // Take pointer to a string. Skip over the longest part of the string that could
5119 // be taken as a field signature. Allow "void" if void_ok.
5120 // Return a pointer to just past the signature.
5121 // Return NULL if no legal signature is found.
5122 char* ClassFileParser::skip_over_field_signature(char* signature,
5123 bool void_ok,
5124 unsigned int length,
5125 TRAPS) {
5126 unsigned int array_dim = 0;
5127 while (length > 0) {
5128 switch (signature[0]) {
5129 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5130 case JVM_SIGNATURE_BOOLEAN:
5131 case JVM_SIGNATURE_BYTE:
5132 case JVM_SIGNATURE_CHAR:
5133 case JVM_SIGNATURE_SHORT:
5134 case JVM_SIGNATURE_INT:
5135 case JVM_SIGNATURE_FLOAT:
5136 case JVM_SIGNATURE_LONG:
5137 case JVM_SIGNATURE_DOUBLE:
5138 return signature + 1;
5139 case JVM_SIGNATURE_CLASS: {
5140 if (_major_version < JAVA_1_5_VERSION) {
5141 // Skip over the class name if one is there
5142 char* p = skip_over_field_name(signature + 1, true, --length);
5144 // The next character better be a semicolon
5145 if (p && (p - signature) > 1 && p[0] == ';') {
5146 return p + 1;
5147 }
5148 } else {
5149 // 4900761: For class version > 48, any unicode is allowed in class name.
5150 length--;
5151 signature++;
5152 while (length > 0 && signature[0] != ';') {
5153 if (signature[0] == '.') {
5154 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5155 }
5156 length--;
5157 signature++;
5158 }
5159 if (signature[0] == ';') { return signature + 1; }
5160 }
5162 return NULL;
5163 }
5164 case JVM_SIGNATURE_ARRAY:
5165 array_dim++;
5166 if (array_dim > 255) {
5167 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5168 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5169 }
5170 // The rest of what's there better be a legal signature
5171 signature++;
5172 length--;
5173 void_ok = false;
5174 break;
5176 default:
5177 return NULL;
5178 }
5179 }
5180 return NULL;
5181 }